Mounting structure of impeller in centrifugal fan

Abstract

The utility model provides an installation structure of an impeller in a centrifugal fan. The installation structure solves the problem that an existing impeller is inconvenient to install. The centrifugal fan comprises a volute and a rotating shaft, air inlets are formed in the left end and the right end of the volute, the rotating shaft is horizontally arranged in the volute, the left end and the right end of the rotating shaft are rotationally supported at the two air inlets respectively, and an impeller is arranged in the volute and comprises an annular wheel disc arranged on the rotating shaft in a sleeving mode and two annular cover plates arranged at the left end and the right end of the annular wheel disc respectively. A circle of blades are arranged between the two annular cover plates and the annular wheel disc, the installation structure comprises a connecting sleeve arranged on the rotating shaft in a sleeving mode, and the connecting sleeve is connected with the rotating shaft through a spline in a matched mode. A positioning ring is arranged on the right end face of the annular wheel disc, sleeves the connecting sleeve and is in threaded connection with the connecting sleeve; an annular positioning seat is formed on the outer wall of the rotating shaft; the left end surface of the annular wheel disc is pressed on the positioning seat; the rotating shaft is further provided with a limiting piece used for limiting the connecting sleeve from moving rightwards. The utility model is convenient to install.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans and relates to a centrifugal fan, in particular to a mounting structure of an impeller in a centrifugal fan. Background Art

[0002] The centrifugal fan impeller is a key component of the centrifugal fan. Its function is to convert gas or fluid into kinetic energy and pressure energy through rotation.

[0003] Existing impellers, such as a double-suction three-dimensional flow impeller assembly for a large high-temperature centrifugal fan disclosed in the Chinese Patent Library (application number: 202211631370.6), include: a main shaft, a connecting disk and two sets of three-dimensional flow impeller devices; the three-dimensional flow impeller device is composed of an arc sleeve, multiple blades, a blade cover plate and a locking nut; the two sets of three-dimensional flow impeller devices are symmetrical in structure; an integrated annular protrusion is provided in the middle of the main shaft, and a plurality of connecting holes are provided on the annular protrusion; a through hole is provided in the middle of the connecting disk, and a plurality of bolt holes are provided around the through hole; the main shaft sleeve is in the through hole, and the end face of the connecting disk contacts the end face of the annular protrusion, and bolts are provided in the connecting hole and the bolt hole to lock the connecting disk and the annular protrusion; the arc sleeve is a trumpet-shaped structure, and the inner diameter of the inner end of the arc sleeve is larger than the inner diameter of the annular protrusion. The outer diameter of the rise, the inner diameter of the outer end of the arc lifting sleeve is smaller than the outer diameter of the annular protrusion, the arc lifting sleeve is sleeved outside the main shaft, the two arc lifting sleeves are respectively located on both sides of the connecting disk, and the inner end of the arc lifting sleeve is fixedly connected to the end face of the connecting disk; the inner edge of the blade is fixedly connected to the surface of the arc lifting sleeve, and the multiple blades under the control of a single set of three-dimensional flow impeller devices are distributed along the circumferential direction; the blade cover plate is sleeved outside the main shaft, the two blade cover plates are respectively located on both sides of the connecting disk, the contour of the inner wall of the blade cover plate is set in accordance with the outer edge of the blade, and the inner wall of the blade cover plate is fixedly connected to the outer edge of the corresponding blade; two threaded sections are arranged on the main shaft, the two threaded sections correspond to the outer ports of the two sets of three-dimensional flow impeller devices respectively, the two locking nuts are threadedly connected to the two threaded sections respectively, the locking nuts are in contact with the outer end faces of the corresponding arc lifting sleeves, and the two locking nuts clamp the two sets of three-dimensional flow impeller devices.

[0004] In the above impeller, the connection between the impeller and the main shaft requires the use of a connecting plate, bolts, bushings and nuts. The overall components are relatively large and the assembly is relatively complicated. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes an installation structure for an impeller in a centrifugal fan which is easy to connect.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an installation structure of an impeller in a centrifugal fan, the centrifugal fan includes a volute with air inlets at both ends and a rotating shaft horizontally arranged in the volute, and the left and right ends of the rotating shaft are respectively rotatably supported at the two air inlets, the impeller is arranged in the volute, the impeller includes an annular wheel disc sleeved on the rotating shaft and two annular cover plates respectively arranged at the left and right ends of the annular wheel disc, and a circle of blades is arranged between the two annular cover plates and the annular wheel disc, and it is characterized in that the installation structure includes a connecting sleeve sleeved on the rotating shaft, and the connecting sleeve and the rotating shaft are connected by spline cooperation; a positioning ring is provided on the right end face of the annular wheel disc coaxially arranged with the annular wheel disc, the positioning ring is sleeved on the outside of the connecting sleeve and the two are threadedly connected; an annular positioning seat is formed on the outer wall of the rotating shaft, and the left end face of the annular wheel disc is pressed on the positioning seat; a limiting member for limiting the rightward movement of the connecting sleeve is also provided on the rotating shaft.

[0007] The connecting sleeve connected to the rotating shaft spline and the locating ring on the annular wheel are connected by threads, and a limiting piece is installed so that the whole formed by the connecting sleeve and the locating ring is axially positioned between the locating seat and the limiting piece. The whole process only requires the installation of the connecting sleeve and the limiting piece. It has the advantages of simple structure and convenient connection.

[0008] In the installation structure of the impeller in the above-mentioned centrifugal fan, the inner diameter of the above-mentioned positioning ring is larger than the inner diameter of the annular wheel disc, and the left end face of the connecting sleeve is pressed on the right end face of the annular wheel disc, which is used to limit the installation of the connecting sleeve, so that the connecting sleeve can be screwed into place at one time, further facilitating the connection.

[0009] In the above-mentioned centrifugal fan impeller installation structure, the limiter is a spring acting on the right end surface of the connecting sleeve, and under the action of the spring, the connecting sleeve has a tendency to move to the left. The spring can not only stably limit the rightward movement of the connecting sleeve, but also play a certain buffering role to filter vibration, so that the impeller can run stably, ensuring the stability and performance of the fan operation.

[0010] In the above-mentioned installation structure of the impeller in the centrifugal fan, the spring is sleeved on the rotating shaft, a limiting ring is sleeved and fixed on the right end of the rotating shaft, and the right end of the spring is pressed on the limiting ring, which has the advantages of simple structure and stable operation.

[0011] In the above-mentioned installation structure of the impeller in the centrifugal fan, the limiting ring is located outside the impeller to facilitate assembly.

[0012] In the above-mentioned installation structure of the impeller in the centrifugal fan, the type of the limiting ring is an elastic retaining ring, and an annular groove for installing the elastic retaining ring is opened on the side wall of the rotating shaft, which is convenient for design and processing.

[0013] As another solution, in the installation structure of the impeller in the above-mentioned centrifugal fan, the limiting member is a positioning sleeve which is sleeved and fixed outside the right end of the rotating shaft, and the positioning sleeve is pressed on the right end surface of the connecting sleeve.

[0014] In the above-mentioned installation structure of the impeller in the centrifugal fan, a circle of insertion holes is axially opened on the right end surface of the connecting sleeve, and during assembly, the insertion holes cooperate with the tool to rotate the connecting sleeve, further facilitating the screwing in of the connecting sleeve.

[0015] In the installation structure of the impeller in the above-mentioned centrifugal fan, a bracket is fixed in each of the two air inlets, and the bracket includes a ring body coaxially arranged with the rotating shaft, the ring body is sleeved on the rotating shaft, and both ends of the rotating shaft are rotatably connected to the two ring bodies by bearings to ensure stable rotation of the rotating shaft.

[0016] In the above-mentioned installation structure of the impeller in the centrifugal fan, the bearing includes an inner ring and an outer ring, and the inner ring and the outer ring are respectively fixedly connected to the rotating shaft and the corresponding ring body by interference fit.

[0017] In the above-mentioned installation structure of the impeller in the centrifugal fan, the above-mentioned limit ring is also provided at the left end of the rotating shaft; an annular limit seat is formed on the inner wall of the ring body, and the adjacent ends of the two inner rings are respectively pressed on the two limit rings, and the opposite ends of the two outer rings are respectively pressed on the two limit seats. That is to say, one of the limit rings is used for the limit spring and the bearing at the same time, achieving a dual-purpose effect, so as to simplify the structure and facilitate assembly.

[0018] Compared with the prior art, the installation structure of the impeller in the centrifugal fan has the following advantages:

[0019] 1. The connecting sleeve connected to the rotating shaft spline and the locating ring on the annular wheel are connected by threads, and a limiting piece is installed to position the whole formed by the connecting sleeve and the locating ring axially between the locating seat and the limiting piece. The whole process only requires the installation of the connecting sleeve and the limiting piece, which has the advantages of simple structure and convenient connection.

[0020] 2. The spring can not only stably limit the rightward movement of the connecting sleeve, but also play a certain role in buffering to filter vibration, so that the impeller can run stably and ensure the stability and performance of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a centrifugal fan.

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0023] Figure 3 yes Figure 1 A magnified schematic diagram of point B in the middle.

[0024] In the figure, 1, volute; 1a, air inlet; 2, rotating shaft; 2a, positioning seat; 3, impeller; 3a, annular wheel; 3a1, positioning ring; 3b, annular cover plate; 3c, blades; 4, connecting sleeve; 4a, jack; 5, spring; 6, limit ring; 7, bracket; 7a, ring body; 7a1, limit seat; 8, bearing. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0026] like Figure 1 As shown, the centrifugal fan includes a volute 1 and a rotating shaft 2 horizontally arranged in the volute 1, and the axis of the rotating shaft 2 extends left and right. The left and right ends of the volute 1 are both air inlets 1a, and the air outlet is arranged at the front side or the rear side of the volute 1; the left and right ends of the rotating shaft 2 are respectively rotatably supported at the two air inlets 1a.

[0027] The impeller 3 is also arranged in the volute 1, and the impeller 3 includes an annular wheel disc 3a sleeved on the rotating shaft 2 and two annular cover plates 3b respectively arranged at the left and right ends of the annular wheel disc 3a, the annular cover plates 3b and the annular wheel disc 3a are arranged coaxially, and a circle of blades 3c is arranged between the two annular cover plates 3b and the annular wheel disc 3a. In actual products, the annular wheel disc 3a and the blades 3c are an integrated structure; the annular cover plates 3b and the blades 3c are a split structure, and preferably the annular cover plates 3b and the corresponding blades 3c are welded and fixedly connected.

[0028] The impeller installation structure of the centrifugal fan includes a connecting sleeve 4 sleeved on the rotating shaft 2, and the connecting sleeve 4 is connected to the rotating shaft 2 through a spline, that is, at this time, a circle of key slots is formed on the side wall of the rotating shaft 2, and a circle of key blocks matching the key slots is formed on the inner wall of the connecting sleeve 4, and the number of key blocks and key slots is the same and the positions correspond one to one. Figure 1 and Figure 2 As shown, the right end face of the annular wheel disc 3a has a positioning ring 3a1 coaxially arranged with the annular wheel disc 3a, and the positioning ring 3a1 and the annular wheel disc 3a are preferably an integral structure. The positioning ring 3a1 is sleeved outside the connecting sleeve 4 and the two are threadedly connected. An annular positioning seat 2a is integrally formed on the outer wall of the rotating shaft 2, and the left end face of the annular wheel disc 3a is pressed on the positioning seat 2a; the rotating shaft 2 is also provided with a limiter for limiting the rightward movement of the connecting sleeve 4.

[0029] The connecting sleeve 4 spline-connected to the rotating shaft 2 and the positioning ring 3a1 on the annular wheel 3a are connected by threads, and a limiting piece is installed so that the whole formed by the connecting sleeve 4 and the positioning ring 3a1 is axially positioned between the positioning seat 2a and the limiting piece. The whole process only requires the installation of the connecting sleeve 4 and the limiting piece, which has the advantages of simple structure and convenient connection.

[0030] Further explanation: the inner diameter of the positioning ring 3a1 is larger than the inner diameter of the annular wheel 3a, and the left end face of the connecting sleeve 4 is pressed on the right end face of the annular wheel 3a, which is used to limit the installation of the connecting sleeve 4, so that the connecting sleeve 4 can be screwed into place at one time, further facilitating the connection.

[0031] In this embodiment,

[0032] The structure of the limiter is as follows: the limiter is a spring 5 acting on the right end face of the connecting sleeve 4, and under the action of the spring 5, the connecting sleeve 4 has a tendency to move to the left. The spring 5 can not only stably limit the rightward movement of the connecting sleeve 4, but also play a certain buffering role to filter vibration, so that the impeller 3 can operate stably, ensuring the stability and performance of the fan operation. Among them, the installation method of the spring 5 is as follows: the spring 5 is sleeved on the rotating shaft 2, and the right end of the rotating shaft 2 is sleeved and fixed with a limit ring 6, and the right end of the spring 5 is pressed on the limit ring 6, which has the advantages of simple structure and stable operation.

[0033] Preferably, the limiting ring 6 is located outside the impeller 3 for easy assembly. The limiting ring 6 is a type of elastic retaining ring, and an annular groove for installing the elastic retaining ring is opened on the side wall of the rotating shaft 2, which is easy to design and process.

[0034] like Figure 1 and Figure 3 As shown, the installation method of the rotating shaft 2 is as follows: a bracket 7 is fixed in each of the two air inlets 1a, and the bracket 7 includes a ring body 7a coaxially arranged with the rotating shaft 2, and the ring body 7a is sleeved on the rotating shaft 2, and both ends of the rotating shaft 2 are rotatably connected with the two ring bodies 7a by bearings 8 to ensure the stable rotation of the rotating shaft 2. Among them, the type of bearing 8 is a ball bearing 8, and the bearing 8 includes an inner ring and an outer ring, and the inner ring and the outer ring are respectively fixed to the rotating shaft 2 and the corresponding ring body 7a by interference fit. Further explanation, the left end of the rotating shaft 2 is also provided with the above-mentioned limit ring 6; the inner wall of the ring body 7a is integrally formed with a ring-shaped limit seat 7a1, and the adjacent ends of the two inner rings are respectively pressed on the two limit rings 6, and the opposite ends of the two outer rings are respectively pressed on the two limit seats 7a1, that is, one of the limit rings 6 is used for the limit spring 5 and the bearing 8 at the same time, achieving a dual-purpose effect, so as to simplify the structure and facilitate assembly.

[0035] In actual products, a circle of ribs is formed between the connecting sleeve 4 and the annular wheel disc 3a to strengthen the structural strength of the connecting sleeve 4 and make the rotating shaft 2 and the annular wheel disc 3a more stably connected. Figure 2 As shown, a circle of insertion holes 4a is axially opened on the right end surface of the connecting sleeve 4, and during assembly, the insertion holes 4a cooperate with a tool to rotate the connecting sleeve 4, further facilitating the screwing in of the connecting sleeve 4. Embodiment 2

[0036] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the limiting member is a positioning sleeve which is sleeved and fixed outside the right end of the rotating shaft 2 , and the positioning sleeve is pressed on the right end surface of the connecting sleeve 4 .

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An installation structure for an impeller in a centrifugal fan, the centrifugal fan comprising a volute (1) with air inlets (1a) at both left and right ends and a rotating shaft (2) arranged horizontally in the volute (1), wherein the left and right ends of the rotating shaft (2) are respectively rotatably supported at the two air inlets (1a), an impeller (3) is arranged in the volute (1), the impeller (3) comprises an annular wheel disc (3a) sleeved on the rotating shaft (2) and two annular cover plates (3b) respectively arranged at the left and right ends of the annular wheel disc (3a), a circle of blades (3c) is arranged between the two annular cover plates (3b) and the annular wheel disc (3a), and the impeller (3) is characterized in that: The mounting structure comprises a connecting sleeve (4) sleeved on a rotating shaft (2), and the connecting sleeve (4) and the rotating shaft (2) are connected by spline matching; a positioning ring (3a1) coaxially arranged with the annular wheel disc (3a) is provided on the right end surface of the annular wheel disc (3a), and the positioning ring (3a1) is sleeved outside the connecting sleeve (4) and the two are threadedly connected; an annular positioning seat (2a) is formed on the outer wall of the rotating shaft (2), and the left end surface of the annular wheel disc (3a) is pressed on the positioning seat (2a); and a limiting member for limiting the rightward movement of the connecting sleeve (4) is also provided on the rotating shaft (2).

2. The installation structure of the impeller in the centrifugal fan according to claim 1, characterized in that: The inner diameter of the positioning ring (3a1) is larger than the inner diameter of the annular wheel disc (3a), and the left end surface of the connecting sleeve (4) is pressed against the right end surface of the annular wheel disc (3a).

3. The installation structure of the impeller in the centrifugal fan according to claim 1 or 2, characterized in that: The limiting member is a spring (5) acting on the right end surface of the connecting sleeve (4), and under the action of the spring (5), the connecting sleeve (4) has a tendency to move to the left.

4. The installation structure of the impeller in the centrifugal fan according to claim 3, characterized in that: The spring (5) is sleeved on the rotating shaft (2), a limiting ring (6) is sleeved and fixed on the right end of the rotating shaft (2), and the right end of the spring (5) is pressed on the limiting ring (6).

5. The installation structure of the impeller in the centrifugal fan according to claim 4, characterized in that: The limiting ring (6) is located outside the impeller (3).

6. The installation structure of the impeller in the centrifugal fan according to claim 5, characterized in that: The type of the limiting ring (6) is an elastic retaining ring, and an annular groove for installing the elastic retaining ring is provided on the side wall of the rotating shaft (2).

7. The installation structure of the impeller in the centrifugal fan according to claim 1, characterized in that: The limiting member is a positioning sleeve which is sleeved and fixed outside the right end of the rotating shaft (2), and the positioning sleeve is pressed on the right end surface of the connecting sleeve (4).

8. The installation structure of the impeller in the centrifugal fan according to claim 1, characterized in that: A circle of insertion holes (4a) is axially provided on the right end surface of the connecting sleeve (4).

9. The installation structure of the impeller in the centrifugal fan according to claim 4, characterized in that: A bracket (7) is fixed in each of the two air inlets (1a), the bracket (7) comprising a ring body (7a) coaxially arranged with the rotating shaft (2), the ring body (7a) being sleeved on the rotating shaft (2), and both ends of the rotating shaft (2) being rotatably connected to the two ring bodies (7a) respectively by means of bearings (8).

10. The installation structure of the impeller in the centrifugal fan according to claim 9, characterized in that: The bearing (8) comprises an inner ring and an outer ring, and the inner ring and the outer ring are respectively fixedly connected to the rotating shaft (2) and the corresponding ring body (7a) by means of interference fit; the above-mentioned limit ring (6) is also provided at the left end of the rotating shaft (2); an annular limit seat (7a1) is formed on the inner wall of the ring body (7a), and the adjacent ends of the two inner rings are respectively pressed on the two limit rings (6), and the opposite ends of the two outer rings are respectively pressed on the two limit seats (7a1).

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