A special-shaped centrifugal fan

Abstract

The present invention discloses a special-shaped centrifugal fan comprising a housing, a main shaft, a rotary drive mechanism, and a centrifugal impeller. The present invention is applicable to the field of centrifugal fan technology and can be directly applied to conveying airflows laden with dust, thereby preventing impeller wear. Furthermore, the present invention can simultaneously separate dust from the airflow, with the separated dust flowing directly into a cyclone separator through a dust outlet along with the airflow. Even in situations of high suction resistance, the present invention can ensure smooth dust flow, preventing accumulation and backflow.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal fans, in particular to a special-shaped centrifugal fan. Background Art

[0002] Centrifugal fans are commonly used exhaust equipment. When the airflow contains dust, larger dust particles can cause severe wear on the fan impeller. Therefore, centrifugal fans are generally not suitable for directly extracting dust-laden airflow and must be connected to a downstream dust removal system.

[0003] The invention patent with application number 202010630587.X discloses a new type of dust separation and collection device. This technology uses centrifugal fan blades to drive the air flow to rotate, which can realize the dust separation function and reduce the wear of dust on the impeller. However, the mechanism itself does not have sufficient exhaust air pressure and cannot independently bear the exhaust occasions with high air volume and air pressure requirements. An external fan is required to provide it with induced wind. This technology also has another problem. Its dust collection port is connected to the dust collection container. The dust collection container is located at the blind end of the pipeline. The separated dust is easy to accumulate at the dust collection port, which affects the separation effect. In one of the technical solutions of this technology, there is a tangential air inlet pipe, but the air port is an air inlet, not an exhaust port. It can only increase the air intake rotation separation effect, but cannot increase the exhaust pressure of the system.

[0004] The invention patent application number 202210037431.X discloses a dust-free pulverizing unit that solves the problem of dynamic dust transport by returning dust to the interior of the pulverizer. However, this technical solution also has certain shortcomings: first, dust return increases the dust content and workload of the air source (such as the pulverizer); second, the return air temperature is high, which increases the temperature of the air source; and third, when the air extraction resistance is large and greater than the inherent pressure gradient in the cylinder, it will lead to poor return flow, causing dust accumulation, and even cause the return pipe to flow back or the return pipe to spray outward, causing a large amount of dust to overflow. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a special-shaped centrifugal fan.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, a special-shaped centrifugal fan includes a casing, a main shaft, a rotary drive mechanism, and a centrifugal impeller:

[0008] The housing comprises a cylindrical outer shell and a volute-shaped outer shell, wherein the length of the cylindrical outer shell is more than twice the width of the volute-shaped outer shell, and the cylindrical outer shell and the volute-shaped outer shell are sealed to each other;

[0009] The housing includes a rear portion close to the centrifugal impeller, a front portion away from the centrifugal impeller, and a middle portion therebetween;

[0010] The main shaft is rotatably connected to the rotary drive mechanism, and the centrifugal impeller is fixedly connected to the main shaft;

[0011] The axis of the main shaft is located on the central axis of the cylindrical shell;

[0012] The volute-shaped housing is located at the front of the shell, and its volute outlet is a dust exhaust port;

[0013] A central air inlet is provided at the center of the front end surface of the shell, and the central air inlet adopts a circular structure.

[0014] In the second aspect, a special-shaped centrifugal fan includes a casing, a main shaft, a rotary drive mechanism, and a centrifugal impeller:

[0015] The housing comprises a cylindrical outer shell and a volute-shaped outer shell, wherein the length of the cylindrical outer shell is more than twice the width of the volute-shaped outer shell, and the cylindrical outer shell and the volute-shaped outer shell are sealed to each other;

[0016] The housing includes a rear portion close to the centrifugal impeller, a front portion away from the centrifugal impeller, and a middle portion therebetween;

[0017] The main shaft is rotatably connected to the rotary drive mechanism, and the centrifugal impeller is fixedly connected to the main shaft;

[0018] The axis of the main shaft is located on the central axis of the cylindrical shell;

[0019] The volute-shaped housing is located at the rear of the housing, and the volute outlet of the volute-shaped housing is an exhaust port;

[0020] A dust outlet is provided at the edge of the front end surface of the shell;

[0021] A central air inlet is provided at the center of the front end surface of the shell, and the central air inlet adopts a circular structure.

[0022] In a third aspect, a special-shaped centrifugal fan includes a housing, a main shaft, a rotary drive mechanism, and a centrifugal impeller:

[0023] The housing comprises a cylindrical outer shell and a volute-shaped outer shell, wherein the length of the cylindrical outer shell is more than twice the width of the volute-shaped outer shell, and the cylindrical outer shell and the volute-shaped outer shell are sealed to each other;

[0024] The housing includes a rear portion close to the centrifugal impeller, a front portion away from the centrifugal impeller, and a middle portion therebetween;

[0025] The main shaft is rotatably connected to the rotary drive mechanism, and the centrifugal impeller is fixedly connected to the main shaft;

[0026] The axis of the main shaft is located on the central axis of the cylindrical shell;

[0027] The front and rear parts of the housing are both volute-shaped housings, and the middle part is a cylindrical housing;

[0028] The volute outlet of the volute-shaped housing at the front of the housing is a dust outlet, and the volute outlet of the volute-shaped housing at the rear of the housing is an air outlet;

[0029] A central air inlet is provided at the center of the front end surface of the shell, and the central air inlet adopts a circular structure.

[0030] Preferably, an air outlet is provided on the edge of the rear end surface of the shell.

[0031] Preferably, the curved portion of the cross-sectional line of the side panel of the volute-shaped housing is a spiral or an Archimedean spiral.

[0032] Preferably, the volute-shaped casing includes a flat cylindrical shell and a pipe that are tangent to each other at the outer edges. The cross-sectional line shape of the side panel inside the tangent point is a circular arc, and the cross-sectional line shape of the side panel outside the tangent point is a straight line. The flat cylindrical shell and the pipe are sealed and connected along the intersection line, and the pipe is a square pipe or a circular pipe.

[0033] Preferably, it also includes a cyclone separator;

[0034] The central air inlet is connected to the air outlet of the cyclone separator;

[0035] The dust exhaust port is connected to the air inlet of the cyclone separator.

[0036] Preferably, the central air inlet is connected to a main air inlet pipe.

[0037] Preferably, the air inlet of the cyclone separator is connected to a main air inlet pipe.

[0038] Preferably, there are two cyclone separators, namely cyclone separator A and cyclone separator B, and the diameter of cyclone separator A is larger than that of cyclone separator B;

[0039] The air inlet of the cyclone separator A is connected to the main air inlet pipe, and the air outlet pipe is connected to the central air inlet;

[0040] The air inlet of the cyclone separator B is connected to the dust exhaust port, and the air outlet is connected to the central air inlet.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] In the present invention, the special-shaped centrifugal fan can be directly applied to convey airflows with high dust content, thus avoiding impeller wear. At the same time, it can simultaneously separate dust from the airflow, and the separated dust flows directly into the cyclone separator through the dust outlet along with the airflow. Even in the case of high suction resistance, it can still ensure smooth dust flow, preventing accumulation and backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the overall structure of a special-shaped centrifugal fan of the present invention. Figure 1 ;

[0044] Figure 2 This is a schematic diagram of the overall structure of a special-shaped centrifugal fan of the present invention. Figure 2 ;

[0045] Figure 3 This is a schematic diagram of the overall structure of a special-shaped centrifugal fan of the present invention. Figure 3 ;

[0046] Figure 4 This is a schematic diagram of the overall structure of a special-shaped centrifugal fan of the present invention. Figure 4 ;

[0047] Figure 5 It is a schematic diagram of the exhaust port structure of a special-shaped centrifugal fan of the present invention.

[0048] Figure 6 This is a schematic diagram of the volute-shaped casing structure of a special-shaped centrifugal fan of the present invention. Figure 1 ;

[0049] Figure 7 This is a schematic diagram of the volute-shaped casing structure of a special-shaped centrifugal fan of the present invention. Figure 2 ;

[0050] Figure 8 This is a schematic diagram of the installation structure of a cyclone separator in a special-shaped centrifugal fan of the present invention. Figure 1 ;

[0051] Figure 9 This is a schematic diagram of the installation structure of a cyclone separator in a special-shaped centrifugal fan of the present invention. Figure 2 ;

[0052] Figure 10 This is a schematic diagram of the installation structure of a cyclone separator in a special-shaped centrifugal fan of the present invention. Figure 3 .

[0053] Figure markings: 01, shell; 011, volute-shaped shell; 0111, side panel; 0112, volute outlet; 0113, volute wrap angle; 0114, pipe; 0115, tangent point; 012, cylindrical shell; 013, central air inlet; 014, dust outlet; 015, exhaust outlet; 02, main shaft; 03, rotary drive mechanism; 04, centrifugal impeller; 05, cyclone separator; 0501, cyclone separator air inlet; 0502, cyclone separator air outlet; 051, cyclone separator A; 052, cyclone separator B; 06, main air inlet pipe. DETAILED DESCRIPTION

[0054] The following is combined with Figure 1-10 , further illustrating a specific embodiment of a special-shaped centrifugal fan of the present invention. The special-shaped centrifugal fan of the present invention is not limited to the description of the following embodiments.

[0055] Example 1:

[0056] This embodiment provides a specific implementation of a special-shaped centrifugal fan, such as Figure 1-2 As shown, it includes a housing 01, a main shaft 02, a rotary drive mechanism 03, and a centrifugal impeller 04, and is characterized by:

[0057] The housing 01 includes a cylindrical outer shell 012 and a volute-shaped outer shell 011. The length of the cylindrical outer shell 012 is more than twice the width of the volute-shaped outer shell 011. The cylindrical outer shell 012 and the volute-shaped outer shell 011 are sealed to each other. The width of the volute-shaped outer shell 011 refers to its axial length.

[0058] The housing 01 includes a rear portion close to the centrifugal impeller 04, a front portion away from the centrifugal impeller 04, and a middle portion therebetween;

[0059] The main shaft 02 is rotatably connected to the rotary drive mechanism 03, and the centrifugal impeller 04 is fixedly connected to the main shaft 02;

[0060] The axis of the main shaft 02 is located on the central axis of the cylindrical shell 012;

[0061] The volute-shaped housing 011 is located at the front of the housing 01, and its volute outlet 0112 is the dust exhaust port 014;

[0062] A central air inlet 013 is provided at the center of the front end surface of the shell 01 , and the central air inlet 013 has a circular structure.

[0063] By adopting the above technical solutions:

[0064] Driven by the rotary drive mechanism 03, the centrifugal impeller 04 rotates at high speed, accelerating the air inside and causing it to overflow from the edge of the centrifugal impeller 04, forming a high-speed rotating peripheral high-pressure cyclone at the edge of the centrifugal impeller 04, while simultaneously drawing air from the center of the centrifugal impeller 04. The peripheral high-pressure cyclone drives the airflow inside the shell 01 to rotate in the same direction, forming a peripheral high-pressure cyclone on the inner wall of the entire shell 01 and an inner low-pressure cyclone distributed along the central axis of the shell. The pressure of the peripheral high-pressure cyclone is higher than the pressure of the external environment, and it moves toward the front of the shell while rotating; the pressure of the inner low-pressure cyclone is lower than the pressure of the external environment, and it moves toward the rear of the shell while rotating. The central air inlet 013 is located at one end of the inner low-pressure cyclone, so that air can be drawn in from the outside.

[0065] When the air drawn in by central air inlet 013 contains dust, the dust enters housing 01 and initially rotates with the inner cyclone, moving toward the rear centrifugal impeller 04. Simultaneously, under the influence of centrifugal force, its radius of rotation continuously expands, and it gradually collects on the inner wall of housing 01. The airflow moving along the inner wall of housing 01 is the outer cyclone, moving toward the front of housing 01. Therefore, the dust collected on the inner wall of housing 01 is moved forward by the airflow and ultimately flows into dust outlet 014.

[0066] By combining the cylindrical housing 012 and the volute housing 011 , the distance from the central air inlet 013 to the centrifugal impeller 04 is extended, thereby providing time and space for centrifugal separation of particles.

[0067] The volute-shaped housing 011 at the front can effectively reduce the eddies and turbulence generated when the peripheral airflow flows into the dust exhaust port, converting the dynamic pressure of the peripheral airflow into static pressure, which is beneficial to increasing the exhaust pressure of the dust exhaust port 014.

[0068] Based on the aforementioned principle, after this special-shaped blower draws the dust-laden airflow into casing 01, larger dust particles are significantly affected by centrifugal force. After entering casing 01, they travel a short distance backward before being flung toward the inner wall of casing 01. They are then carried back to the front of casing 01 by the peripheral high-pressure cyclone and discharged through dust outlet 014, without affecting centrifugal impeller 04. Only fine powder, exceeding the separation capacity of this mechanism, can enter centrifugal impeller 04. However, due to its low mass and kinetic energy, fine powder does not cause significant wear and tear on centrifugal impeller 04.

[0069] The special-shaped centrifugal fan provided in this embodiment is particularly suitable for conveying and discharging airflow containing a large amount of dust, particles and foreign matter, such as exhaust air in workplaces such as electric saws and polishing machines.

[0070] Example 2:

[0071] This embodiment provides a specific implementation of a special-shaped centrifugal fan, such as Figure 5As shown, other structures are similar to those of Example 1, except that an air outlet 015 is provided on the edge of the rear end surface of the shell 01.

[0072] By adopting the above technical solutions:

[0073] This embodiment adds an exhaust port 015 to the first embodiment. Exhaust port 015 is located at the rear of housing 01, at the edge of cylindrical housing 012. There are three possible locations for exhaust port 015: one is located on the rear circular end face, near the edge; the second is located on the side wall of cylindrical housing 012, near the rear end face; and the third is located at the junction of the rear end face and the side wall of cylindrical housing 012.

[0074] The special-shaped centrifugal fan provided in this embodiment enhances the wind pressure and air volume of the dust exhaust port while taking into account the exhaust function.

[0075] Example 3:

[0076] This embodiment provides a specific implementation of a special-shaped centrifugal fan, such as Figure 6-10 As shown, other structures are similar to those of Example 2, except that the curved portion of the cross-sectional line of the side panel of the volute-shaped housing 011 is a spiral or an Archimedean spiral.

[0077] By adopting the above technical solutions:

[0078] The side panels of the volute-shaped housing 011 refer to the outer wall of the volute outlet 0112, such as Figure 6 As shown. A spiral is any path that rotates around a central point or axis while gradually moving away from the moving point. The Archimedean spiral is a special type of spiral, an equidistant involute spiral. Making the side panels of the volute housing 011 spiral-shaped helps improve efficiency and increase the pressure of exhaust or dust removal.

[0079] In one possible embodiment, the volute-shaped housing 011 includes a flat cylindrical shell and a pipe 0114 tangent to each other at the outer edges, the cross-sectional line shape of the side panel 0111 inside the tangent point 0115 is an arc, and the cross-sectional line shape of the side panel 0111 outside the tangent point is a straight line, the flat cylindrical shell and the pipe 0114 are sealed and connected along the intersection line, and the pipe 0114 is a square pipe or a circular pipe.

[0080] By adopting the above technical solutions:

[0081] This embodiment provides a simplified volute-shaped housing structure in which the side wall panels of the volute outlet 0112 are not spiral-shaped, but formed by the tangent connection of a circular arc and a straight line.

[0082] When this embodiment is adopted, the volute wrap angle is generally less than 45 degrees. The volute wrap angle refers to the central angle between the end (nose end) of the volute and the volute inlet section. The larger the volute wrap angle, the higher the exhaust efficiency. When the volute wrap angle is 360 degrees, it is called a complete wrap angle; when it is less than 360 degrees, it is called an incomplete wrap angle. The larger the volute wrap angle at the rear, the smaller the internal vortex intensity and the lower the separation efficiency, but the exhaust capacity increases; the smaller the wrap angle, the greater the internal vortex intensity and the higher the separation efficiency, but the exhaust capacity decreases.

[0083] This implementation sacrifices some efficiency, but at the same time has the following effects: First, it simplifies the structure and reduces manufacturing costs, which is especially suitable for situations where the cross-sectional area of ​​the exhaust port or dust exhaust port is small; second, it is conducive to reducing the curved surface length of the exhaust port or dust exhaust port, reducing sanitary dead corners, and facilitating sanitary cleaning, which is especially suitable for work scenarios with high hygiene requirements.

[0084] In a possible embodiment, a cyclone separator 05 is further included;

[0085] The central air inlet 013 is connected to the cyclone separator outlet 0502;

[0086] The dust exhaust port 014 is connected to the air inlet 0501 of the cyclone separator.

[0087] By adopting the above technical solutions:

[0088] This embodiment solves the dust collection problem by combining it with a cyclone separator 05. While the aforementioned structure can collect dust, flowing it into the dust outlet and discharging it with the airflow, it only discharges a dust-laden airflow, failing to collect the dust. The separated dust is then fed into the cyclone separator 05 through the dust outlet 014. The dust remains within the cyclone separator 05, and the airflow exits the cyclone separator's air outlet 0502 and flows back into the housing 01 through the central air inlet 013, forming a small loop that dynamically collects the dust.

[0089] In this embodiment, although the separation efficiency of the cyclone separator 05 is relatively low, repeated experiments have shown that this embodiment can still efficiently collect the dust separated from the inside of the shell. The main reasons are as follows: First, although some finer dust overflows from the cyclone separator 05, the overflowed dust will flow into the central air inlet 013 and be separated again. After repeated circulation, a higher separation efficiency can be achieved; secondly, the dust concentration in the air flow discharged from the dust exhaust port 014 is relatively high. According to the principle of the cyclone separator, the higher the dust concentration, the higher the separation efficiency of the cyclone separator 05; finally, in most cases, the small circulation air flow rate is less than the total air intake of the central air inlet 013, so a cyclone separator 05 with a smaller diameter can be selected to obtain a higher separation efficiency.

[0090] This embodiment can prevent the dust separated and collected inside the special-shaped fan housing from causing local accumulation, wall hanging, backflow and other problems due to poor dust discharge.

[0091] In a possible implementation, the central air inlet 013 is connected to a main air inlet pipe 06 .

[0092] By adopting the above technical solutions:

[0093] This embodiment refines an application method, where the main air inlet pipe 06 is connected to the central air inlet 013, or the main air inlet pipe 06 is connected to the cyclone separator air outlet 0502 pipeline and then connected to the central air inlet 013.

[0094] The working principle of this embodiment is as follows: dust-containing air flows in from the main air inlet pipe 06, and then enters the shell 01 through the central air inlet 013. The dust is separated and flows into the cyclone separator 05 from the dust exhaust port 014 with a small amount of air flow. The particulate dust is retained in the cyclone separator 05, and the air flow flows back to the shell 01 from the central air inlet 013 again.

[0095] In this embodiment, the dust-laden airflow flows directly into the shell 01, and the overall resistance is relatively small. It is suitable for exhaust dust removal with large flow and low concentration. The disadvantage is that the separation efficiency is slightly low.

[0096] In a possible implementation, the cyclone separator air inlet 0501 is connected to a main air inlet pipe 06 .

[0097] By adopting the above technical solutions:

[0098] This embodiment refines another application mode, where the main air inlet pipe 06 is connected to the air inlet 0501 of the cyclone separator, or the main air inlet pipe 06 is connected to the dust exhaust port 014 and then connected to the air inlet 0501 of the cyclone separator.

[0099] The working principle of this embodiment is as follows: the dust-laden air flow first flows into the cyclone separator 05, most of the dust is separated by the cyclone separator 05, and a small amount of overflowed dust flows out from the cyclone separator outlet 0502, flows into the shell 01 through the central air inlet 013, and undergoes secondary separation inside the shell 01. The dust collected by the secondary separation flows out from the dust exhaust port 014, flows into the cyclone separator 05 again through the pipeline, and the dust collected by the secondary separation is sent to the cyclone separator 05 again.

[0100] This embodiment enables the dust-laden airflow to undergo secondary separation, resulting in higher separation efficiency, and is particularly suitable for exhaust dust removal with high dust concentration and relatively low flow rate. The disadvantage is that a large amount of airflow must first pass through the cyclone separator 05 before flowing into the shell 01, resulting in greater overall resistance and higher energy consumption.

[0101] In a possible embodiment, two cyclone separators 05 are provided, namely cyclone separator A051 and cyclone separator B052. The diameter of cyclone separator A051 is larger than that of cyclone separator B052.

[0102] The air inlet of cyclone separator A051 is connected to the main air inlet pipe 06, and its air outlet pipe is connected to the central air inlet 013;

[0103] The air inlet of the cyclone separator B052 is connected to the dust exhaust port 014, and the air outlet is connected to the central air inlet 013.

[0104] By adopting the above technical solutions:

[0105] In this embodiment, two cyclone separators 05 are used. The cyclone separator A051 separates the total intake air once, and the separated airflow flows into the shell 01 through the central air inlet 013 for secondary separation. The dust collected by the secondary separation enters the cyclone separator B052 with a small amount of airflow through the dust exhaust port 014. The dust is separated by the cyclone separator B052, and the excess airflow flows back to the shell 01 from the central air inlet 013 again.

[0106] This embodiment separates the dust-laden airflow twice, and the overall separation efficiency is relatively high. The cyclone separator used for the first separation has a larger diameter, smaller resistance, and larger flow rate, but the separation efficiency is relatively low. The dust after the second separation is collected in the cyclone separator B. A cyclone separator with a small diameter, small flow rate, large resistance, and high efficiency can be selected to improve the efficiency of collecting the dust from the second separation, reduce the total amount of reflux dust, and thus improve the separation efficiency.

[0107] This implementation is particularly suitable for applications involving long-distance conveying of dust-laden airflow. When conveying over long distances and with high dust concentrations, dust can settle and accumulate in the ductwork, impacting ventilation. In these situations, the cyclone separator A051 can be installed close to the dust-laden air source. After a primary separation, the dust concentration in the airflow is reduced, and the dust is then transported via long-distance ducting to the central air inlet 013, thus avoiding ductwork accumulation.

[0108] Example 4:

[0109] This embodiment provides a specific implementation of a special-shaped centrifugal fan, such as Figure 3 As shown, other structures are similar to those of embodiment 2, except that the volute-shaped housing 011 is located at the rear of the housing 01, and the volute outlet 0112 of the volute-shaped housing 011 is an exhaust port 015;

[0110] A dust outlet 014 is provided at the edge of the front end surface of the housing 01 .

[0111] By adopting the above technical solutions:

[0112] This embodiment is similar in structure to embodiment 2, except for two aspects: first, the volute casing 011 is located at the rear of the entire shell 01, the cylindrical shell 012 is located at the front of the entire shell 011, and the volute outlet 0112 is the exhaust port 015; second, the dust exhaust port 014 is located at the front edge of the cylindrical shell 012.

[0113] The dust exhaust port 014 is located at the edge of the front end face, and there are three possibilities: one is located on the front circular end face, close to the edge area; the second is located on the side wall of the cylindrical shell 012, close to the front end face area; the third is located at the junction of the front end face and the side wall of the cylindrical shell 012.

[0114] The operating principle is similar to that of Example 2, except that the dust exhaust port 014 at the front can still discharge dust, but the dust exhaust pressure and air volume are reduced; the air exhaust port 015 at the rear of the shell 01 adopts a volute outlet structure, which increases the exhaust pressure.

[0115] The special-shaped centrifugal fan provided in this embodiment has the function of sucking in air containing particulate matter and simultaneously discharging two air flows, with high-concentration dust being discharged from the front dust outlet and air with lower dust concentration being discharged from the rear air outlet.

[0116] The special-shaped centrifugal fan provided in this embodiment is particularly suitable for working conditions where it is necessary to extract dust-laden airflow and at the same time separate the dust in the airflow.

[0117] Example 5:

[0118] This embodiment provides a specific implementation of a special-shaped centrifugal fan (its working principle is similar to that of embodiment 3), as shown in FIG. Figure 6-10 As shown, other structures are similar to those of Example 4, except that the curved portion of the cross-sectional line of the side panel of the volute-shaped housing 011 is a spiral or an Archimedean spiral.

[0119] In one possible embodiment, the volute-shaped housing 011 includes a flat cylindrical shell and a pipe 0114 tangent to each other at the outer edges, the cross-sectional line shape of the side panel 0111 inside the tangent point 0115 is an arc, and the cross-sectional line shape of the side panel 0111 outside the tangent point is a straight line, the flat cylindrical shell and the pipe 0114 are sealed and connected along the intersection line, and the pipe 0114 is a square pipe or a circular pipe.

[0120] In a possible embodiment, a cyclone separator 05 is further included;

[0121] The central air inlet 013 is connected to the cyclone separator outlet 0502;

[0122] The dust exhaust port 014 is connected to the air inlet 0501 of the cyclone separator.

[0123] In a possible implementation, the central air inlet 013 is connected to a main air inlet pipe 06 .

[0124] In a possible implementation, the cyclone separator air inlet 0501 is connected to a main air inlet pipe 06 .

[0125] In a possible embodiment, two cyclone separators 05 are provided, namely cyclone separator A051 and cyclone separator B052. The diameter of cyclone separator A051 is larger than that of cyclone separator B052.

[0126] The air inlet of cyclone separator A051 is connected to the main air inlet pipe 06, and its air outlet pipe is connected to the central air inlet 013;

[0127] The air inlet of the cyclone separator B052 is connected to the dust exhaust port 014, and the air outlet is connected to the central air inlet 013.

[0128] Example 6:

[0129] This embodiment provides a specific implementation of a special-shaped centrifugal fan, such as Figure 4 As shown, the other structures are similar to those of embodiment 2, except that the front and rear parts of the housing 01 are both volute-shaped housings 011, and the middle part is a cylindrical housing 012;

[0130] The volute outlet 0112 of the volute-shaped housing 011 at the front of the housing 01 is a dust outlet 014 , and the volute outlet 0112 of the volute-shaped housing 011 at the rear of the housing 01 is an air outlet 015 .

[0131] By adopting the above technical solutions:

[0132] The difference between Example 6 and Example 2 is that the housing 01 includes a cylindrical outer shell 012 and two volute-shaped outer shells 011 , the volute outlet 0112 at the front is a dust outlet 014 , and the volute outlet 0112 at the rear is an air outlet 015 .

[0133] The special-shaped centrifugal fan provided in this embodiment can simultaneously increase the exhaust pressure and dust exhaust pressure, and is suitable for working conditions that require both dust separation and independent exhaust capability.

[0134] Example 7:

[0135] This embodiment provides a specific implementation of a special-shaped centrifugal fan (its working principle is similar to that of embodiment 3), as shown in FIG. Figure 6-10 As shown, other structures are similar to those of Example 6, except that the curved portion of the cross-sectional line of the side panel of the volute-shaped housing 011 is a spiral or an Archimedean spiral.

[0136] In one possible embodiment, the volute-shaped housing 011 includes a flat cylindrical shell and a pipe 0114 tangent to each other at the outer edges, the cross-sectional line shape of the side panel 0111 inside the tangent point 0115 is an arc, and the cross-sectional line shape of the side panel 0111 outside the tangent point is a straight line, the flat cylindrical shell and the pipe 0114 are sealed and connected along the intersection line, and the pipe 0114 is a square pipe or a circular pipe.

[0137] In a possible embodiment, a cyclone separator 05 is further included;

[0138] The central air inlet 013 is connected to the cyclone separator outlet 0502;

[0139] The dust exhaust port 014 is connected to the air inlet 0501 of the cyclone separator.

[0140] In a possible implementation, the central air inlet 013 is connected to a main air inlet pipe 06 .

[0141] In a possible implementation, the cyclone separator air inlet 0501 is connected to a main air inlet pipe 06 .

[0142] In a possible embodiment, two cyclone separators 05 are provided, namely cyclone separator A051 and cyclone separator B052. The diameter of cyclone separator A051 is larger than that of cyclone separator B052.

[0143] The air inlet of cyclone separator A051 is connected to the main air inlet pipe 06, and its air outlet pipe is connected to the central air inlet 013;

[0144] The air inlet of the cyclone separator B052 is connected to the dust exhaust port 014, and the air outlet is connected to the central air inlet 013.

[0145] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A special-shaped centrifugal fan, comprising a housing (01), a main shaft (02), a rotary drive mechanism (03), and a centrifugal impeller (04), characterized in that: The housing (01) comprises a cylindrical outer shell (012) and a volute-shaped outer shell (011), the length of the cylindrical outer shell (012) is more than twice the width of the volute-shaped outer shell (011), and the cylindrical outer shell (012) and the volute-shaped outer shell (011) are sealed and connected to each other; The housing (01) comprises a rear portion close to the centrifugal impeller (04), a front portion away from the centrifugal impeller (04), and a middle portion therebetween; The main shaft (02) is rotatably connected to the rotary drive mechanism (03), and the centrifugal impeller (04) is fixedly connected to the main shaft (02); The axis of the main shaft (02) is located on the central axis of the cylindrical shell (012); The front and rear parts of the housing (01) are both volute-shaped housings (011), and the middle part is a cylindrical housing (012); The volute outlet (0112) of the volute-shaped housing (011) at the front of the housing (01) is a dust outlet (014), and the volute outlet (0112) of the volute-shaped housing (011) at the rear of the housing (01) is an air outlet (015); A central air inlet (013) is provided at the center of the front end surface of the shell (01), and the central air inlet (013) adopts a circular structure; The curved portion of the cross-sectional line of the side panel of the volute-shaped housing (011) is a spiral or an Archimedean spiral; The volute-shaped housing (011) comprises a flat cylindrical shell and a pipe (0114) whose outer edges are tangent to each other; the cross-sectional line shape of the side panel (0111) inside the tangent point (0115) is an arc, and the cross-sectional line shape of the side panel (0111) outside the tangent point is a straight line; the flat cylindrical shell and the pipe (0114) are sealed and connected along the intersection line; and the pipe (0114) is a square pipe or a circular pipe; Also includes a cyclone separator (05); The central air inlet (013) is connected to the cyclone separator air outlet (0502); The dust discharge port (014) is connected to the air inlet (0501) of the cyclone separator; The cyclone separators (05) are provided with two, namely cyclone separator A (051) and cyclone separator B (052), and the diameter of cyclone separator A (051) is larger than the diameter of cyclone separator B (052); The air inlet of the cyclone separator A (051) is connected to the main air inlet pipe (06), and the air outlet pipe is connected to the central air inlet (013); The air inlet of the cyclone separator B (052) is connected to the dust exhaust port (014), and the air outlet is connected to the central air inlet (013).

2. The special-shaped centrifugal fan according to claim 1, characterized in that: An air outlet (015) is provided on the edge of the rear end surface of the shell (01).

3. The special-shaped centrifugal fan according to claim 1, characterized in that: The central air inlet (013) is connected to a main air inlet pipe (06).

4. The special-shaped centrifugal fan according to claim 1, characterized in that: The cyclone separator air inlet (0501) is connected to a main air inlet pipe (06).

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