Volute structure of centrifugal fan, centrifugal fan and integrated cooker
By setting adjustable air outlets and connections in the centrifugal fan volute structure, the problem of uneven flow caused by the uncertain direction of the integrated stove smoke pipe is solved, uniform air outlet and efficient smoke exhaust are achieved, and noise and cost are reduced.
Patent Information
- Application Number
- CN202421784951.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The direction of the external smoke pipe in existing integrated stove products is uncertain, resulting in uneven flow at the volute air outlet and poor smoke exhaust effect.
A first and a second air outlet are set in the volute structure of the centrifugal fan, facing different directions respectively. The opening and closing of the air outlet are controlled by a baffle, and the flow is adjusted by the connecting point to ensure that the flow of the air outlets on both sides is equal, thereby achieving single-sided air outlet.
It ensures that the air output on both sides of the volute is uniform regardless of how the direction of the smoke pipe changes, improves the smoke exhaust efficiency, reduces noise and manufacturing costs, and simplifies the installation process.
Smart Images
Figure CN222772383U_ABST
Abstract
Description
Technical Field
[0001] The utility model particularly relates to a volute structure of a centrifugal fan, a centrifugal fan and an integrated stove. Background Art
[0002] One of the problems that still exists with current integrated stove products is that the direction of the external smoke pipe is uncertain, and it is inconvenient to switch the connection direction between the integrated stove and the smoke pipe. To address this problem, the prior art usually provides a volute structure with left and right air outlets to correspond to external smoke pipes connected in different directions. However, in actual use, it is found that there are differences in the flow rate of fluid flowing out of different air outlets. This is determined by the rotation direction of the impeller, that is, when the direction of the air outlet is consistent with the rotation direction of the impeller, the flow rate is not affected, while in the opposite direction, the flow rate decreases, and part of the fluid accumulates in the volute and cannot be quickly discharged, resulting in a poor smoke exhaust effect. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the defect of small and uneven air output of a volute with multiple air outlets in the prior art, and to provide a volute structure of a centrifugal fan, a centrifugal fan and an integrated stove.
[0004] The utility model solves the above technical problems through the following technical solutions:
[0005] A volute structure of a centrifugal fan, the volute structure of the centrifugal fan includes a guide volute, an impeller is arranged in the guide volute and is connected to the guide volute, the guide volute is provided with a first air outlet and a second air outlet, the first air outlet extends in a first direction, and the second air outlet extends in a second direction opposite to the first direction, the guide volute includes a first volute and a second volute coaxially arranged with the impeller, the first air outlet is arranged on the first volute, and the second air outlet is arranged on the second volute, when the first air outlet is opened, the second air outlet is closed by a first baffle, when the second air outlet is opened, the first air outlet is closed by the first baffle, a connecting point is provided between the first volute and the second volute, and when the first air outlet or the second air outlet is closed, the connecting point is opened by the second baffle.
[0006] In this solution, by setting the first air outlet and the second air outlet in the relative first direction and the second direction to correspond to the smoke pipes connected in different directions, the first air outlet or the second air outlet is closed by the first baffle to realize the reversing air outlet of the guide volute, that is, single-sided air outlet, without the need to set up an additional smoke-collecting structure between the guide volute and the smoke pipe, thereby reducing the manufacturing cost. When the air is discharged from one side, the first air outlet or the second air outlet can be opened specifically, and the guide volute guides the fluid accordingly, without increasing the motor power, so as to reduce the noise generated when the impeller is working. The first volute and the second volute are also provided with a connecting point, so that when the first air outlet or the second air outlet is opened by the second baffle, when the rotation direction of the impeller is inconsistent, the fluid is supplemented to the corresponding first volute or the second volute through the connecting point, so that the flow from the first air outlet and the second air outlet remains equal, that is, when the two sides of the guide volute are discharged, equivalent air outlet can be achieved, thereby ensuring the smoke exhaust efficiency of the centrifugal fan.
[0007] Preferably, the volute tongue of the first volute is wrapped around the outer peripheral side of the impeller and is communicated with the impeller, the volute tongue of the second volute is wrapped around the outer peripheral side of the impeller and is communicated with the impeller, the volute tongue of the second volute and the volute tongue of the first volute are spaced apart from the edge of the impeller, a portion of the second volute is wrapped around the outer peripheral side of the first volute and the first air outlet and the second air outlet are located at the same height along the height direction of the guide volute.
[0008] In the present solution, through the above arrangement, compared with the first air outlet and the second air outlet being arranged at different heights, the space occupied along the height direction of the guide volute is smaller, thereby improving space utilization.
[0009] Preferably, a line connecting the volute tongue of the second volute and the axis of the impeller and a line connecting the volute tongue of the first volute and the axis of the impeller are arranged at an angle of 45°-145°.
[0010] In this solution, the flow rates of the first air outlet and the second air outlet are kept equal by setting the volute tongue angles of the first volute and the second volute.
[0011] Preferably, a line connecting the volute tongue of the second volute and the impeller axis and a line connecting the impeller axis along the height direction of the guide volute are arranged at an angle of 10°-20°.
[0012] In the present solution, through the above-mentioned arrangement, the volute tongue of the second volute is located at the lowest point on the outer peripheral side of the impeller, thereby reducing the oil deposition on the inner wall of the volute. At the same time, there is no need to open an oil leakage hole on the volute, thereby improving the aerodynamic performance of the guide volute, reducing the processing procedures and reducing the manufacturing cost.
[0013] Preferably, the first air outlet and the second air outlet have the same size.
[0014] In this solution, through the above configuration, compared with the method in which the two air outlets need to be set to different sizes to ensure the air volume, the two air outlets of the same size occupy less space and can ensure that the aerodynamic performance of the two air outlets is basically the same.
[0015] Preferably, the second baffle cover is arranged at the connecting point and when the first air outlet or the second air outlet is closed, the second baffle is driven by a driving mechanism and moves along the outer surface of the first volute.
[0016] In the present embodiment, the second baffle can slide relative to the outer surface of the first volute and increase the cross-sectional area of the first volute or the second volute, so that when the first volute or the second volute is different from the rotation direction of the impeller and the air output is affected, the air output of the first volute or the second volute is increased by increasing the cross-sectional area of the first volute or the second volute, so that equivalent air output can be achieved no matter which side of the guide volute is used for air output, thereby improving the air output performance of the whole machine.
[0017] Preferably, the second baffle includes a fixed guide plate and a sliding guide plate, the fixed guide plate is fixedly connected to the outer surface of the first volute, at least one sliding guide plate is provided, and at least one sliding guide plate is slidably connected to the fixed guide plate through a driving mechanism.
[0018] In this solution, the above-mentioned setting is used to realize the opening or closing of the connection point.
[0019] Preferably, the moving distance of the sliding guide plate is 0-0.75L, wherein L is the length of the fixed guide plate.
[0020] In this solution, the above arrangement is used to ensure that the air output of the first volute or the second volute remains the same when the connection is opened.
[0021] A centrifugal fan comprises the volute structure of the centrifugal fan as described above.
[0022] In this solution, the centrifugal fan includes the above-mentioned volute structure, and the first volute and the second volute of the guide volute correspond to the smoke pipes from different directions, so there is no need to rotate the direction of the centrifugal fan, which reduces the manual disassembly steps, reduces the motor power and the noise generated when the centrifugal fan is working. In addition, the air volume of the two air outlets is adjusted through the connection to ensure that the air volume of the two air outlets is the same, that is, the air outlets on both sides are equivalent, thereby improving the user experience.
[0023] An integrated stove comprises the centrifugal fan as described above.
[0024] In this solution, the integrated stove includes the above-mentioned centrifugal fan so that the left and right sides of the centrifugal fan can exhaust air equivalently, and there is no need to set the rotation direction of the impeller, which can simplify the installation process of the integrated stove and there is no need to set up a bidirectional motor or a bidirectional control program, making the integrated stove more convenient to use.
[0025] The positive progress effect of the utility model is that the utility model sets the first air outlet and the second air outlet in the relative first direction and the second direction to correspond to the smoke pipes connected in different directions, and uses the first baffle to close the first air outlet or the second air outlet to realize the reversing air outlet of the guide volute, that is, single-sided air outlet, without the need to set up an additional smoke-collecting structure between the guide volute and the smoke pipe, thereby reducing the manufacturing cost. When the air is discharged from one side, the first air outlet or the second air outlet can be opened specifically, and the guide volute guides the corresponding fluid, without increasing the motor power, so as to reduce the noise generated when the impeller is working. The first volute and the second volute are also provided with a connecting part, so that when the first air outlet or the second air outlet is opened by the second baffle, when the rotation direction of the impeller is inconsistent, the fluid is supplemented to the corresponding first volute or the second volute through the connecting part, so that the flow from the first air outlet and the second air outlet remains equal, that is, when the two sides of the guide volute are discharged, equivalent air outlet can be achieved, thereby ensuring the smoke exhaust efficiency of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 The figure is a three-dimensional diagram of a centrifugal fan according to a preferred embodiment of the present invention.
[0027] Figure 2 This is a diagram showing the position relationship between the guide volute and the impeller of a preferred embodiment of the utility model.
[0028] Figure 3 The utility model is a three-dimensional diagram of a preferred embodiment of the guide volute.
[0029] Figure 4 This is a diagram showing the positional relationship between the volute tongue of the first volute and the volute tongue of the second volute in a preferred embodiment of the utility model.
[0030] Figure 5 This is a schematic diagram of a closed state of a connecting point of a preferred embodiment of the utility model.
[0031] Figure 6 This is a schematic diagram of the open state of the connection point of a preferred embodiment of the utility model.
[0032] Figure 7 This is a positional relationship diagram of a fixed guide plate and a sliding guide plate in a preferred embodiment of the utility model.
[0033] Description of reference numerals:
[0034] Diversion volute 10
[0035] First volute 11
[0036] Second volute 12
[0037] Cochlear tongue 1
[0038] First air outlet 111
[0039] Second air outlet 121
[0040] Impeller 20
[0041] Connection 30
[0042] The second baffle 40
[0043] Fixed guide plate 41
[0044] Sliding deflector 42 DETAILED DESCRIPTION
[0045] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.
[0046] This embodiment provides a volute structure of a centrifugal fan, the specific structure is as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the volute structure of the centrifugal fan includes a guide volute 10, the impeller 20 is arranged in the guide volute 10 and communicated with the guide volute 10, the guide volute 10 is provided with a first air outlet 111 and a second air outlet 121, the first air outlet 111 extends toward a first direction, and the second air outlet 121 extends toward a second direction opposite to the first direction, the guide volute 10 includes a first volute 11 and a second volute 12 coaxially arranged with the impeller 20, the first air outlet 111 extends toward a first direction, and the second air outlet 121 extends toward a second direction opposite to the first direction. 1 is arranged on the first volute 11, and the second air outlet 121 is arranged on the second volute 12. When the first air outlet 111 is opened, the second air outlet 121 is closed by a first baffle (not shown in the figure); when the second air outlet 121 is opened, the first air outlet 111 is closed by the first baffle; a connecting portion 30 is arranged between the first volute 11 and the second volute 12; when the first air outlet 111 or the second air outlet 121 is closed, the connecting portion 30 is opened by the second baffle 40.
[0047] Specifically, the first volute 11 and the second volute 12 are both spirally arranged on the outer peripheral side of the impeller 20. The first volute 11 and the second volute 12 are integrally formed to form an overall guide volute 10. The guide volute 10 is used to discharge the fluid sucked into the inlet of the impeller 20 to the smoke duct. In this embodiment, it refers to the diversion of oil smoke generated by cooking and discharged into the smoke duct through the first air outlet 111 and the second air outlet 121. Since the direction of the smoke duct of the existing integrated stove is uncertain, that is, it may be located on the first side or the second side of the integrated stove, the first air outlet 111 and the second air outlet 121 are set in the relative first direction and the second direction to connect the smoke ducts in different directions. In addition, in this embodiment, a first baffle is also provided. The first baffle is a flat plate and is used to cover the first air outlet 111 or the second air outlet 121, thereby closing the first air outlet 111 or the second air outlet 121 in a targeted manner. The smoke pipe is located at the second air outlet 121 and the second air outlet 121 is opened, and the first air outlet 111 is closed by the first baffle as an example. The impeller 20 rotates, and the airflow flows through the impeller inlet into the blade channel. After the impeller 20 does work, it moves at a high speed in the guide volute 10. Since the first air outlet 111 is closed, the resistance of the first volute 11 reaches the maximum value at this time, and the airflow does not continue to flow into the first volute 11 but flows to the second volute 12 and is discharged to the smoke pipe from the second air outlet 121. The first air outlet 111 is opened in the same way, and no further elaboration is given here. The first baffle is utilized to close the first air outlet 111 or the second air outlet 121, so as to realize the reversing air outlet of the guide volute 10, i.e., one-sided air outlet, facing the smoke pipes from different directions of the integrated stove, so that the guide volute 10 can be connected to the smoke pipes accordingly, without rotating the direction of the guide volute 10, and further without changing the rotation direction of the impeller 20 to realize the airflow diversion to the smoke pipes in different directions, and at the same time, there is no need to set an additional smoke collection structure between the guide volute 10 and the smoke pipe, thereby reducing the manufacturing cost.
[0048] It should be noted that the first baffle can be connected to the first air outlet 111 or the second air outlet 121 through a bolt assembly. In other embodiments, a slide can be provided to slide the first baffle in the slide to close or open the first air outlet 111 or the second air outlet 121 in a sliding state. This is the prior art and will not be elaborated herein.
[0049] It can be understood that when air is discharged from one side, the first air outlet 111 or the second air outlet 121 can be opened specifically, and the guide volute 10 can guide the fluid accordingly. There is no need to increase the motor power of the impeller 20, and the motor power of the impeller 20 can even be appropriately reduced to reduce the noise generated when the impeller 20 is working.
[0050] In the present embodiment, a connecting point 30 is further provided between the first volute 11 and the second volute 12. The connecting point 30 is a hole opened at the corresponding position of the wall surface of the first volute 11 and the wall surface of the second volute 12, so as to guide the airflow in the first volute 11 or the second volute 12 to the corresponding volute with the air outlet opened through the connecting point 30. The present embodiment is explained by taking the counterclockwise rotation of the impeller 20 as an example. The direction of the first air outlet 111 of the first volute 11, which is connected to the outer peripheral side of the impeller 20, is consistent with the rotation direction of the impeller 20. Compared with the second air outlet 121 of the second volute 12, which is opposite to the rotation direction of the impeller 20, the fluid flow rate in the first volute 11 is greater than the fluid flow rate in the second volute 12. At this time, the first volute 11 closes the first air outlet through the first baffle. The opening 111 is closed, airflow is accumulated in the first volute 11, and the second air outlet 121 of the second volute 12 is connected to the smoke pipe, and the second baffle 40 is covered on the connecting portion 30. By moving the second baffle 40 and opening the connecting portion 30, part of the fluid in the first volute 11 is diverted from the connecting portion 30 to the second volute 12, so that the flow rates from the first air outlet 111 and the second air outlet 121 remain equal. Similarly, when the first air outlet 111 is opened and the second air outlet 121 is closed, the connecting portion 30 can also be opened or closed accordingly to ensure that the flow rates from the first air outlet 111 and the second air outlet 121 remain equal, that is, equivalent air outlet can be achieved when air is discharged from either side of the guide volute 10, thereby ensuring the smoke exhaust efficiency of the centrifugal fan.
[0051] Furthermore, the volute tongue 1 of the first volute 11 is wrapped around the outer peripheral side of the impeller 20 and is communicated with the impeller 20, the volute tongue 1 of the second volute 12 is wrapped around the outer peripheral side of the impeller 20 and is communicated with the impeller 20, the volute tongue 1 of the second volute 12 and the volute tongue 1 of the first volute 11 are spaced apart from the edge of the impeller 20, a portion of the second volute 12 is wrapped around the outer peripheral side of the first volute 11 and the first air outlet 111 and the second air outlet 121 are located at the same height along the height direction of the guide volute 10.
[0052] Specifically, the volute tongue 1 is the end plate of the first volute 11 and the second volute 12. The first volute 11 and the second volute 12 are both connected to the outer peripheral side of the impeller 20 through the volute tongue 1. The airflow enters the first volute 11 and the second volute 12 from the outer peripheral side of the impeller 20 through the volute tongue 1. The volute tongue 1 arranged at intervals makes the first volute 11 and the second volute 12 evenly arranged in the limited space on the outer peripheral side of the impeller 20, avoiding interference, and also making the airflow entering the first volute 11 and the second volute 12 keep roughly the same, thereby achieving equivalent air outlets of the first air outlet 111 and the second air outlet 121. In addition, the first volute 11 and the second volute 12 are wound around the outer peripheral side of the impeller 20 by the volute tongue 1. Compared with the volute structure directly extending in the radial direction of the impeller 20, the first volute 11 and the second volute 12 are arranged in a spiral structure after being wound and the first air outlet 111 and the second air outlet 121 are extended to the same height, so as to reduce the space occupied in the radial direction of the impeller 20.
[0053] Moreover, in this embodiment, the first air outlet 111 and the second air outlet 121 are arranged at the same height, which occupies less space along the height direction of the guide volute 10 than when the first air outlet 111 and the second air outlet 121 are arranged at different heights, thereby improving space utilization. It is understandable that when the first air outlet 111 and the second air outlet 121 of the same height are discharging air, since they extend the same distance along the height direction, the first air outlet 111 and the second air outlet 121 can ensure equivalent air discharge effects.
[0054] In this embodiment, a line connecting the volute tongue 1 of the second volute 12 and the axis of the impeller 20 and a line connecting the volute tongue 1 of the first volute 11 and the axis of the impeller 20 are arranged at an angle of 45°-145°.
[0055] Specifically, the area corresponding to the axis of the impeller 20 between the volute tongue 1 of the first volute 11 and the volute tongue 1 of the second volute 12, which are spaced apart along the outer periphery of the impeller 20, is set at an angle γ, and the value range of the angle γ is 45°-145°. The volute tongue 1 of the first volute 11 is located above the volute tongue 1 of the second volute 12 for explanation. A connecting line is drawn along the height direction of the guide volute 10 and through the axis of the impeller 20. The connecting line is the reference line in the vertical direction, wherein the volute tongue 1 of the second volute 12 passes through the connecting line and extends along the outer periphery of the impeller 20 toward the first air outlet 111, while the volute tongue 1 of the first volute 11 passes through the connecting line and extends along the outer periphery of the impeller 20 toward a position away from the second air outlet 121, so that the flow rates of the first air outlet 111 and the second air outlet 121 remain equal through the angle setting of the volute tongue 1 of the first volute 11 and the second volute 12.
[0056] Preferably, γ is 140°. According to the analysis of finite element software in the prior art, when γ is 140°, when the connection 30 is not opened, the flow rates of the first air outlet 111 and the second air outlet 121 can also be kept substantially equal. Finite element software is software for simulating and analyzing fluids in the prior art. This embodiment is not an improvement on the software, and will not be described in detail herein.
[0057] In this embodiment, a line connecting the volute tongue 1 of the second volute 12 and the axis of the impeller 20 and a line connecting the axis of the impeller 20 along the height direction of the guide volute 10 are arranged at an angle of 10°-20°.
[0058] Specifically, the line connecting the volute tongue 1 of the second volute 12 and the axis of the impeller 20 and the reference line are set at an angle β, and the value range of the angle β is 10°-20°. It should be noted that the volute tongue 1 of the second volute 12 passes through the reference line and extends along the outer peripheral side of the impeller 20 toward the first air outlet 111, and the line connecting the volute tongue 1 of the second volute 12 and the reference line forms an angle β, that is, while being close to the reference line, the volute tongue 1 of the second volute 12 is at the lowest point on the outer peripheral side of the impeller 20 compared to other positions, and the oil generated by the accumulation of oil smoke will flow into the first air outlet 111 at the position where the volute tongue 1 of the second volute 12 forms an angle β with the reference line, thereby reducing the oil deposition on the inner wall of the second volute 12, and at the same time, there is no need to open an oil leakage hole on the first volute 11, thereby improving the aerodynamic performance of the guide volute 10, reducing the processing procedures, and reducing the manufacturing cost.
[0059] Furthermore, the first air outlet 111 and the second air outlet 121 have the same size.
[0060] Specifically, the first volute 11 and the second volute 12 are distributed in a spiral structure from the outer peripheral side of the impeller 20, and the inner cavity size a of the first volute 11 and the second volute 12 away from the volute tongue 1 is the same, and the size b of the first air outlet 111 and the second air outlet 121 is the same. This is because the volute tongues 1 of the first volute 11 and the second volute 12 are arranged at intervals and do not interfere with each other, so that the cavity size a of the first volute 11 and the second volute 12 is set to be the same, and the size b of the first air outlet 111 and the second air outlet 121 is set to be the same, which can also meet the requirements of equivalent air outlets of the first air outlet 111 and the second air outlet 121. Compared with the method of setting the two air outlets to different sizes to ensure the air volume, two air outlets of the same size occupy less space and can ensure that the aerodynamic performance of the two air outlets is basically the same in terms of the air outlet size.
[0061] In this embodiment, the second baffle 40 is covered at the connection point 30 and when the first air outlet 111 or the second air outlet 121 is closed, the second baffle 40 is driven by a driving mechanism (not shown) and moves along the outer surface of the first volute 11 .
[0062] Specifically, while the second volute 12 is spaced apart from the volute tongue 1 of the first volute 11, at least part of the second volute 12 is overlapped on the outer surface of the first volute 11. To save materials, the overlapped part can share the wall surface of the first volute 11, so as to reduce the manufacturing cost of the flow guide volute 10. The connecting point 30 is arranged on the wall surface shared by the first volute 11 and the second volute 12, and the second baffle 40 is covered on the connecting point 30 and driven by the driving mechanism to move along the wall surface shared by the first volute 11 and the second volute 12, thereby realizing the opening or closing of the connecting point 30.
[0063] Taking the example that the driving mechanism drives the second baffle 40 to slide along the wall surface shared by the first volute 11 and the second volute 12, the second baffle 40 slides relative to the outer surface of the first volute 11, the connection 30 is opened, and the fluid in the first volute 11 enters the second volute 12 through the connection 30. From the cross-sectional view, in addition to the cross-sectional area of the cavity of the second volute 12 itself, the cavity of the additional diversion airflow to the second volute 12 is also considered to be the cross-sectional area of the cavity of the second volute 12 itself, that is, by increasing the cross-sectional area of the second volute 12, when the second volute 12 rotates in a different direction from the impeller 20 and the air volume is affected, the air volume of the second volute 12 is increased by increasing the cross-sectional area of the second volute 12. Similarly, when the air volume of the first volute 11 is less than that of the second volute 12, the connection 30 can also be opened accordingly, so that the two sides of the diversion volute 10 can achieve equivalent air flow when the air is discharged on either side, thereby improving the air outlet performance of the whole machine.
[0064] In this embodiment, the second baffle 40 includes a fixed guide plate 41 and a sliding guide plate 42. The fixed guide plate 41 is fixedly connected to the outer surface of the first volute 11, and at least one sliding guide plate 42 is provided. At least one sliding guide plate 42 is slidably connected to the fixed guide plate 41 through a driving mechanism.
[0065] Specifically, the fixed guide plate 41 and the sliding guide plate 42 have the same shape as the outer surface of the first volute 11, both of which are arc-shaped structures. The fixed guide plate 41 and the sliding guide plate 42 are connected by a hinge structure. The driving mechanism is a retractable hydraulic rod, and the extended end of the hydraulic rod is connected to the sliding guide plate 42 to drive the sliding guide plate 42 to move or slide relative to the fixed guide plate 41 when the hydraulic cylinder contracts to open the connection 30.
[0066] In other embodiments, the fixed guide plate 41 and the sliding guide plate 42 may be connected via a drag chain structure, the driving mechanism has a driving wheel, the drag chain is wrapped around the driving wheel and connected to the sliding guide plate 42, the number of sliding guide plates 42 may be multiple, and two adjacent sliding guide plates 42 are connected via a drag chain structure to drive one or more sliding guide plates 42 to slide along the surface of the fixed guide plate 41 when the driving wheel rotates.
[0067] In this embodiment, the moving distance of the sliding guide plate 42 is 0-0.75L, where L is the length of the fixed guide plate 41. From the cross-section, the fixed guide plate 41 and the sliding guide plate 42 are both arc-shaped structures and the lengths of the two are consistent. According to the finite element software analysis test in the prior art, when the sliding guide plate 42 slides relative to the fixed guide plate 41 and the length of the overlapping part of the two, that is, the moving distance of the sliding guide plate 42 is 0-0.75L, the air volume of the first air outlet 111 of the first volute 11 or the second air outlet 121 of the second volute 12 remains the same, that is, the two sides of the guide volute 10 have equivalent air outlets.
[0068] Of course, the moving distance of the sliding guide plate 42 can be adjusted within the above range according to the actual measured air volume of the first air outlet 111 or the second air outlet 121. This is a prior art and will not be elaborated herein.
[0069] This embodiment also provides a centrifugal fan, which includes the volute structure of the centrifugal fan described above. The centrifugal fan includes the volute structure described above, and the first volute 11 and the second volute 12 of the guide volute 10 are connected to the smoke pipes from different directions, so there is no need to rotate the direction of the centrifugal fan, which reduces the manual disassembly steps, the motor power and the noise generated when the centrifugal fan is working. In addition, the air volume of the two air outlets is adjusted through the connecting part 30 to ensure that the air volume of the two air outlets is the same, that is, the air outlets on both sides are equivalent, thereby improving the user experience.
[0070] This embodiment also provides an integrated stove, which includes the above-mentioned centrifugal fan.
[0071] The integrated stove has a smoke duct in the first direction or the second direction, and includes the above-mentioned centrifugal fan, so that the first air outlet 111 and the second air outlet 121 in the first direction and the second direction of the centrifugal fan can exhaust air equivalently, that is, the left and right sides of the centrifugal fan can exhaust air equivalently, and there is no need to change the rotation direction of the impeller. During installation, the air outlet in the other direction is closed accordingly according to the setting direction of the smoke duct, and the air volume of the two air outlets is known, which can simplify the installation process of the integrated stove, and there is no need to set up a bidirectional motor and a bidirectional control program, thereby reducing the power consumption of the integrated stove and making the integrated stove more convenient to use.
[0072] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.
Claims
1. A volute structure of a centrifugal fan, the volute structure of the centrifugal fan comprising a guide volute, an impeller disposed in the guide volute and connected to the guide volute, the guide volute being provided with a first air outlet and a second air outlet, the first air outlet extending in a first direction, the second air outlet extending in a second direction opposite to the first direction, characterized in that: The guide volute includes a first volute and a second volute coaxially arranged with the impeller, the first air outlet is arranged on the first volute, and the second air outlet is arranged on the second volute. When the first air outlet is opened, the second air outlet is closed by a first baffle, and when the second air outlet is opened, the first air outlet is closed by the first baffle. A connecting point is arranged between the first volute and the second volute, and when the first air outlet or the second air outlet is closed, the connecting point is opened by the second baffle.
2. The volute structure of the centrifugal fan according to claim 1, characterized in that: The volute tongue of the first volute is wound around the outer peripheral side of the impeller and is communicated with the impeller, the volute tongue of the second volute is wound around the outer peripheral side of the impeller and is communicated with the impeller, the volute tongue of the second volute and the volute tongue of the first volute are spaced apart from the edge of the impeller, a portion of the second volute is wound around the outer peripheral side of the first volute and the first air outlet and the second air outlet are located at the same height along the height direction of the guide volute.
3. The volute structure of the centrifugal fan according to claim 2, characterized in that: A line connecting the volute tongue of the second volute and the axis of the impeller and a line connecting the volute tongue of the first volute and the axis of the impeller are arranged at an angle of 45°-145°.
4. The volute structure of the centrifugal fan according to claim 3, characterized in that: A line connecting the volute tongue of the second volute and the impeller axis and a line connecting the impeller axis along the height direction of the guide volute are arranged at an angle of 10°-20°.
5. The volute structure of a centrifugal fan according to claim 1, characterized in that: The first air outlet and the second air outlet have the same size.
6. The volute structure of a centrifugal fan according to claim 1, characterized in that: The second baffle cover is arranged at the connecting point and when the first air outlet or the second air outlet is closed, the second baffle is driven by the driving mechanism and moves along the outer surface of the first volute.
7. The volute structure of the centrifugal fan according to claim 6, characterized in that: The second baffle includes a fixed guide plate and a sliding guide plate. The fixed guide plate is fixedly connected to the outer surface of the first volute. At least one sliding guide plate is provided, and at least one sliding guide plate is slidably connected to the fixed guide plate through a driving mechanism.
8. The volute structure of the centrifugal fan according to claim 7, characterized in that: The moving distance of the sliding guide plate is 0-0.75L, wherein L is the length of the fixed guide plate.
9. A centrifugal fan, characterized in that: The centrifugal fan comprises a volute structure of a centrifugal fan as claimed in any one of claims 1 to 8.
10. An integrated stove, characterized in that: The integrated stove includes the centrifugal fan as claimed in claim 9.