Centrifugal fan, air conditioner indoor unit and air conditioner

Abstract

The utility model discloses a centrifugal fan, an air conditioner indoor unit and an air conditioner, and relates to the technical field of air conditioning equipment, the centrifugal fan comprises a volute and a wind wheel, the volute is provided with an air duct, at least one side of the volute in the axial direction is provided with a first air inlet communicated with the air duct, the volute is provided with an air outlet channel communicated with the air duct, and the volute is provided with a volute tongue; the wind wheel is arranged in the air channel, an air inlet channel is arranged on the peripheral wall of the volute, an inlet of the air inlet channel and an outlet of the air inlet channel are sequentially arranged in the rotating direction of the wind wheel, and the connecting line of the tangent line of the inner wall of the volute tongue and the axis of the volute is a first connecting line along the section perpendicular to the axis of the volute. The connecting line of the inlet of any air inlet channel and the axis of the volute is the second connecting line, the included angle between the first connecting line and the second connecting line in the rotating direction of the wind wheel is a, and a is larger than or equal to 13 degrees and smaller than or equal to 155 degrees, so that the air inlet channels can compensate the air inlet amount in the radial direction of the volute, and the air outlet effect of the centrifugal fan can be enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning equipment technical field, especially centrifugal fan, air conditioner indoor unit and air conditioner. BACKGROUND

[0002] At present, centrifugal fan has volute, the air inlet of volute is usually arranged at both sides of the axial direction of volute, and the air outlet of volute is arranged along the radial direction of volute, the volute with the structure can only take in air along the axial direction, when the thickness of volute is large, the air located at the position of the outer circumferential wall of volute will not be inhaled smoothly, and the air needs to bypass the outer circumferential wall of volute and enter the volute from the air inlet of volute, so that the air intake of centrifugal fan is relatively reduced, and the air outlet effect of centrifugal fan is affected. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art is solved, for this purpose, the utility model provides a kind of centrifugal fan, air intake can be compensated in the radial direction of volute, and the air outlet effect of centrifugal fan can be enhanced.

[0004] The utility model further provides an air conditioner indoor unit with the above centrifugal fan.

[0005] The utility model further provides an air conditioner with the above air conditioner indoor unit.

[0006] According to the first aspect embodiment of the utility model's centrifugal fan, comprising:

[0007] Volute, with air duct and volute tongue, the volute is provided with first air inlet communicated with the air duct along at least one side of its axial direction, and the volute is provided with air outlet passage communicated with the air duct;

[0008] Fan wheel, is arranged in the air duct;

[0009] Wherein, the outer circumferential wall of the volute is provided with at least one air inlet passage communicated with the air duct, the air inlet passage has inlet and outlet, the inlet and the outlet are sequentially arranged along the rotation direction of the fan wheel, in the cross section perpendicular to the axis of the volute, the tangent line of the inner wall of the volute tongue and the connecting line of the axis of the volute are first connecting line, and the connecting line of the inlet of any one air inlet passage and the axis of the volute is second connecting line, along the rotation direction of the fan wheel, the included angle between the first connecting line and the second connecting line is a, and satisfies: 13 ° ≤ a ≤ 155 °.

[0010] The centrifugal fan has at least the following beneficial effects: the air inlet channel is arranged on the outer peripheral wall of the volute, the inlet and the outlet of the air inlet channel are arranged in sequence along the rotation direction of the fan wheel, the included angle a between the first connecting line and the second connecting line satisfies the requirement of 13 DEG ≤a≤155 DEG, and the air inlet channel can only intake air during rotation of the fan wheel.

[0011] According to some embodiments of the present application, at least part of the inner wall of the air inlet channel is configured as a flow guide wall, and the distance between the flow guide wall and the axis of the volute gradually decreases along the rotation direction of the fan wheel.

[0012] According to some embodiments of the present application, the air inlet channel is multiple, and the multiple air inlet channels are arranged at intervals along the circumferential direction of the volute, the first inlet is a first inlet, and the last inlet is a second inlet, the connecting line between the first inlet and the axis of the volute is a third connecting line, the connecting line between the second inlet and the axis of the volute is a fourth connecting line, the included angle between the third connecting line and the fourth connecting line along the rotation direction of the fan wheel is b, and 5 DEG ≤b≤140 DEG is satisfied.

[0013] According to some embodiments of the present application, the height of the inlet along the radial direction of the volute is c, and 2.5mm≤c≤5.5mm is satisfied.

[0014] According to some embodiments of the present application, the width of the outlet along the circumferential direction of the volute is d, and 3mm≤d≤10mm and c≤d are satisfied.

[0015] According to some embodiments of the present application, the volute is provided with the first air inlet and the second air inlet on both sides along the axial direction thereof, the distance between the first air inlet and the second air inlet along the axial direction of the volute is e, the length of the outlet is f, and f≤e-20mm is satisfied.

[0016] According to some embodiments of the present application, the air inlet channel is provided with multiple reinforcing ribs arranged at intervals along the axial direction of the volute, and the multiple reinforcing ribs separate the air inlet channel into multiple sub-channels arranged at intervals along the axial direction of the volute and communicated with the air duct.

[0017] According to some embodiments of the present application, the length of the outlet of the sub-channel along the axial direction of the volute is g, and 15mm≤g≤50mm is satisfied.

[0018] According to some embodiments of the present application, the volute comprises a first shell part and a second shell part which are detachably connected to each other, the first shell part and the second shell part define the air duct and the first air inlet therebetween, the air outlet channel is formed in the first shell part, and the volute tongue and the air inlet channel are formed in the second shell part.

[0019] According to some embodiments of the present application, the first shell part is provided with a buckle on at least one side along the axial direction of the volute, and the second shell part is provided with a buckle position corresponding to the buckle on one side along the axial direction of the volute, and the buckle is in clamped connection with the buckle position.

[0020] The air conditioner indoor unit according to the second aspect of the present application comprises:

[0021] A shell body has a cavity, and one side of the shell body is provided with a third air inlet in communication with the cavity;

[0022] A heat exchanger is arranged in the cavity and covers the third air inlet;

[0023] The centrifugal fan according to the first aspect of the present application is arranged in the shell body, and the air outlet channel is in communication with the cavity.

[0024] The air conditioner indoor unit according to the second aspect of the present application comprises the centrifugal fan according to the first aspect of the present application, and thus at least has the beneficial effects described above, which will not be repeated here.

[0025] According to some embodiments of the present application, the air conditioner indoor unit further comprises a chassis part, one side of the shell body away from the third air inlet is provided with a mounting opening, the chassis part is mounted in the mounting opening, and the centrifugal fan is connected to the chassis part.

[0026] According to some embodiments of the present application, the centrifugal fan further comprises a plurality of volutes, a plurality of wind wheels, a connecting plate, a rotating shaft and a driving device, the plurality of volutes are arranged at intervals along the height direction of the shell body, the outer wall of the air outlet channel of the plurality of volutes is fixedly connected to the connecting plate, the chassis part is provided with an opening for avoiding the air outlet channel, the connecting plate is mounted in the opening, the plurality of wind wheels are fixedly connected to the rotating shaft, the chassis part is provided with a bearing seat, the rotating shaft is in rotatable connection with the bearing seat, and the driving device is used to drive the rotating shaft to rotate.

[0027] According to some embodiments of the present application, the centrifugal fan further comprises a gland, the bottom disc part is provided with a mounting seat, the gland is detachably connected with the mounting seat, and an installation cavity is defined between the gland and the mounting seat, and the driving device is installed in the installation cavity.

[0028] The air conditioner according to the third aspect of the present application comprises the air conditioner indoor unit according to the second aspect.

[0029] The air conditioner according to the third aspect of the present application comprises the air conditioner indoor unit according to the second aspect, and thus at least has the beneficial effects described above, which will not be repeated here.

[0030] The air conditioner according to the third aspect of the present application comprises the air conditioner indoor unit according to the second aspect, and thus at least has the beneficial effects described above, which will not be repeated here.

[0031] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in combination with the drawings and embodiments, in which:

[0033] Figure 1 is a sectional view of the centrifugal fan according to some embodiments of the present application;

[0034] Figure 2 is Figure 1 is an enlarged view of position A in FIG.

[0035] Figure 3 is a structural schematic view of the second shell part of the volute of the centrifugal fan according to some embodiments of the present application;

[0036] Figure 4 is a structural schematic view of the air conditioner indoor unit according to some embodiments of the present application;

[0037] Figure 5 is a sectional view of the air conditioner indoor unit according to some embodiments of the present application;

[0038] Figure 6 is an exploded view of the air conditioner indoor unit according to some embodiments of the present application;

[0039] Figure 7 is a sectional view of the volute and the connecting plate of the centrifugal fan according to some embodiments of the present application;

[0040] Figure 8 is Figure 7 is an enlarged view of position B in FIG.

[0041] Figure 9 is Figure 7 enlarged view at C;

[0042] Figure 10 is Figure 7 enlarged view at D;

[0043] Figure 11 is Figure 7 enlarged view at E;

[0044] Figure 12 is a partial structure schematic view of a shell of an air conditioner indoor unit, a connecting plate of a centrifugal fan and a volute of the centrifugal fan according to some embodiments of the present application;

[0045] Figure 13 is a sectional view of a shell of an air conditioner indoor unit, a connecting plate of a centrifugal fan and a volute of the centrifugal fan according to some embodiments of the present application;

[0046] Figure 14 is an exploded view of a driving device of a centrifugal fan, a bottom plate component of an air conditioner indoor unit and a gland of the centrifugal fan according to some embodiments of the present application;

[0047] Figure 15 is a structure schematic view of a gland of a centrifugal fan according to some embodiments of the present application;

[0048] Figure 16 is a sectional view of a bottom plate component of an air conditioner indoor unit and a driving device of a centrifugal fan according to some embodiments of the present application;

[0049] Figure 17 is a comparison graph of experimental data of a centrifugal fan according to some embodiments of the present application.

[0050] Reference signs:

[0051] centrifugal fan 1000;

[0052] air conditioner indoor unit 2000;

[0053] volute 100, air duct 110, first air inlet 120, second air inlet 121, air outlet passage 130, air inlet passage 140, inlet 141, outlet 142, flow guide wall 143, reinforcing rib 144, sub-passage 145, volute tongue 150, first shell part 160, buckle 161, first clamping groove 162, second shell part 170, buckle position 171, rib plate 172;

[0054] fan wheel 200;

[0055] connecting plate 300, rotating shaft 310, driving device 320;

[0056] The shell 400, the cavity 410, the third air inlet 420, the heat exchanger 430, and the mounting port 440;

[0057] The chassis part 500, the opening 510, the bearing seat 520, the bearing 521, the gland 530, the second clamping groove 531, the pin hole 532, the mounting seat 540, the mounting cavity 541, the second mounting hole 542, the second screw 543, the clamping hook 544, the first mounting hole 550, and the first screw 560.

[0058] The first connecting line X1, the first connecting line X2, the third connecting line X3, the fourth connecting line X4, and the axis X5. DETAILED DESCRIPTION

[0059] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0060] At present, the centrifugal fan has a volute, the air inlets of the volute are usually arranged on both sides of the axial direction of the volute, and the air outlets of the volute are arranged along the radial direction of the volute. The volute with such a structure can only take in air along the axial direction. When the thickness of the volute is large, the air at the outer peripheral wall of the volute cannot be taken in smoothly. This part of air needs to bypass the outer peripheral wall of the volute and enter the volute from the air inlet of the volute. The air intake of the centrifugal fan is relatively reduced, and the air outlet effect of the centrifugal fan is affected.

[0061] Based on this, referring to Figure 1 and Figure 3 , a centrifugal fan 1000 provided by the embodiments of the present application is shown. The inside of the volute 100 is formed with an air duct 110, and the air wheel 200 is arranged in the air duct 110. The first air inlet 120 can be arranged only on one side of the volute 100 along the axial direction of the volute 100. The first air inlet 120 is communicated with the air duct 110. This is a single-suction centrifugal fan. Alternatively, as shown in Figure 3 , the first air inlet 120 and the second air inlet 121 can be arranged on both sides of the volute 100 along the axial direction of the volute 100, respectively. The first air inlet 120 and the second air inlet 121 are both communicated with the air duct 110. This is a double-suction centrifugal fan. The volute 100 is further provided with an air outlet passage 130. The air outlet passage 130 is communicated with the air duct 110. The air outlet passage 130 can be understood as a nozzle-shaped structure. The centrifugal fan 1000 takes in air through the first air inlet 120 and discharges air through the air outlet passage 130. That is, the centrifugal fan 1000 takes in air along the axial direction and discharges air along the radial direction. The axial direction of the centrifugal fan 1000 can refer to Figure 1 and Figure 3The axis of the axial, centrifugal fan 1000 is X6.

[0062] Referring to Figure 1 and Figure 2 As shown, the outer peripheral wall of the volute 100 is provided with an air inlet passage 140, which connects the outside of the volute 100 and the air duct 110, and has an inlet 141 and an outlet 142. In order to ensure that the air inlet passage 140 can only intake air, the arrangement of the air inlet passage 140 is related to the rotation direction of the impeller 200. Specifically, the rotation direction of the impeller 200 can be referred to the arrow direction in Figure 1 Along the rotation direction of the impeller 200, the inlet 141 of the air inlet passage 140 is arranged in sequence with the outlet 142 of the air inlet passage 140. Such arrangement can make the inlet 141 located on the side of the outlet 142 facing away from the rotation direction of the impeller 200. It can also be understood that the inlet 141 is arranged in the opposite direction of the rotation direction of the impeller 200. During the rotation of the impeller 200, the impeller 200 will throw the airflow along the radial direction of the volute 100. The arrangement of the present embodiment can make the air inlet passage 140 not conform to the airflow flowing outward along the radial direction of the volute 100. That is, there will be a certain resistance if the airflow in the air duct 110 flows out of the volute 100 through the air inlet passage 140. The flow direction of the airflow will also change greatly, which makes it difficult for the airflow in the air duct 110 to flow from the outlet 142 of the air inlet passage 140 to the inlet 141 of the air inlet passage 140.

[0063] From another angle, it can be understood that the direction perpendicular to the plane where the inlet 141 is located and the direction perpendicular to the plane where the outlet 142 is located are at an included angle with each other. The outlet 142 is arranged to face the impeller 200. Since the inlet 141 and the outlet 142 are arranged in sequence along the rotation direction of the impeller 200, the inlet 141 is located on the side of the outlet 142 facing away from the rotation direction of the impeller 200. From another angle, it can also be understood that the outer peripheral wall of the volute 100 is provided with a boss structure, and the air inlet passage 140 is formed in the boss structure. The inlet 141 of the air inlet passage 140 is located on the side of the boss structure facing away from the rotation direction of the impeller 200, and the outlet 142 of the air inlet passage 140 is arranged to face the impeller 200. Since the inlet 141 and the outlet 142 are arranged in sequence along the rotation direction of the impeller 200, it can make the airflow in the air duct 110 difficult to flow from the outlet 142 to the inlet 141.

[0064] It should be noted that in order to ensure that the air inlet passage 140 can only intake air, the position of the air inlet passage 140 on the outer peripheral wall of the volute 100 also has certain requirements. Specifically, referring to Figure 1 and Figure 2As shown, along the cross section perpendicular to the axis X5 of the volute 100, the tangent line of the inner wall of the volute tongue 150 of the volute 100 and the axis X5 of the volute 100 is a first connecting line X1, and the connecting line of the inlet 141 of any one air inlet channel 140 and the axis X5 is a second connecting line X2, the first connecting line X1 and the second connecting line X2 are straight lines, and the included angle between the second connecting line X2 and the first connecting line X1 in the rotation direction of the impeller 200 is a, which satisfies: 13°≤a≤155°. It needs to be explained that the included angle a refers to the range of the area from the first connecting line X1 as the starting point to the second connecting line X2 as the ending point in the rotation direction of the impeller 200. By limiting the inlet 141 of the air inlet channel 140 in the above-mentioned included angle area, the inlet 141 of the air inlet channel 140 can be away from the diffuser section of the volute 100. When the impeller 200 rotates, a negative pressure is generated near the air inlet channel 140, so that the air inlet channel 140 can suck air, and it is ensured that the air inlet channel 140 can only intake air. If the air inlet channel 140 is too close to the diffuser section of the volute 100, it will be not conducive to the air suction of the air inlet channel 140. It needs to be explained that through experiments, it is verified that if the air inlet channel 140 is arranged in other areas outside the above-mentioned included angle a, the effect of compensating the air intake cannot be achieved, but the air intake of the volute 100 will be reduced.

[0065] For the centrifugal fan 1000 of the embodiment, it can be understood that the air inlet channel 140 is additionally arranged at the outer peripheral wall position of the volute 100 on the basis of the related art. When the impeller 200 rotates, a negative pressure is generated near the air inlet channel 140, so that the air inlet channel 140 can suck air. Therefore, the air intake can be compensated in the radial direction of the volute 100, and the air located at the outer peripheral wall position of the volute 100 can smoothly enter the air duct 110 of the volute 100 without bypassing the outer wall of the volute 100 to enter the air duct 110 from the first air inlet 120. The air intake of the centrifugal fan 1000 can be improved, and the air outlet effect of the centrifugal fan 1000 can be enhanced, especially for the volute 100 with a large axial thickness, the effect is improved more obviously. In addition, since the air intake is improved, the rotation speed of the motor driving the rotation of the impeller 200 can be reduced when the same level of air intake effect is achieved, so that the power consumption of the motor is reduced, and the centrifugal fan 1000 can be more energy-saving and environmentally friendly.

[0066] Referring to Figure 17As shown, it is a comparison diagram of experimental data of three groups of schemes, wherein the opening refers to the above-mentioned air inlet channel 140, the non-opening scheme refers to the centrifugal fan scheme without arranging the air inlet channel 140 in the related art, the opening scheme 1 is the centrifugal fan 1000 scheme of some embodiments of the present application, and the opening scheme 2 is the centrifugal fan 1000 scheme of another embodiment of the present application. The difference between the opening scheme 1 and the opening scheme 2 is only the number and position of the air inlet channel 140. It should be noted that the air inlet channel 140 of the opening scheme 1 and the opening scheme 2 meets the requirements of the above-mentioned embodiments. By comparing the non-opening scheme and the opening scheme 1, or comparing the non-opening scheme and the opening scheme 2, it can be seen that the air inlet of the opening scheme is relatively improved compared with the non-opening scheme. Therefore, arranging the above-mentioned air inlet channel 140 can increase the air inlet of the volute 100, especially for the low-speed working condition, the air inlet is greatly improved, for example, for the opening scheme 1, when the speed of the fan wheel 200 is 600 rpm, the air flow rate reaches 17.3%, that is, the air inlet is increased by 17.3%, and the air flow rate is higher than that of the high-speed working condition. Therefore, the scheme of the present embodiment is more effective in the low-speed working condition. In addition, by comparing the opening scheme 1 and the opening scheme 2, since the number of air inlet channels 140 of the opening scheme 1 is more, and the number of air inlet channels 140 arranged near the volute tongue 150 is more, the air inlet of the opening scheme 1 is more improved than that of the opening scheme 2, and the air inlet compensation effect is better. Figure 17 It can be seen that, by comparing the non-opening scheme and the opening scheme 1, or comparing the non-opening scheme and the opening scheme 2, the air inlet of the opening scheme is relatively improved compared with the non-opening scheme. Therefore, arranging the above-mentioned air inlet channel 140 can increase the air inlet of the volute 100, especially for the low-speed working condition, the air inlet is greatly improved, for example, for the opening scheme 1, when the speed of the fan wheel 200 is 600 rpm, the air flow rate reaches 17.3%, that is, the air inlet is increased by 17.3%, and the air flow rate is higher than that of the high-speed working condition. Therefore, the scheme of the present embodiment is more effective in the low-speed working condition. In addition, by comparing the opening scheme 1 and the opening scheme 2, since the number of air inlet channels 140 of the opening scheme 1 is more, and the number of air inlet channels 140 arranged near the volute tongue 150 is more, the air inlet of the opening scheme 1 is more improved than that of the opening scheme 2, and the air inlet compensation effect is better.

[0067] Referring to Figure 1 As shown, in some embodiments, the air inlet channel 140 is arranged along the axial direction of the volute 100, the length of the air inlet channel 140 along the axial direction of the volute 100 is greater than the width of the air inlet channel 140 along the circumferential direction of the volute 100, and the air inlet channel 140 can be understood as a flat structure. The length of the inlet 141 along the axial direction of the volute 100 is greater than the width of the inlet 141 along the circumferential direction of the volute 100, so as to increase the air inlet area of the inlet 141.

[0068] Referring to Figure 2As shown, in some embodiments, at least part of the inner wall of the air inlet channel 140 is configured as a guide wall 143, which is located between the inlet 141 of the air inlet channel 140 and the outlet 142 of the air inlet channel 140, and can also be understood as extending from the inlet 141 of the air inlet channel 140 to the outlet 142 of the air inlet channel 140. When the air inlet channel 140 is inhaled, the external airflow flows along the guide wall 143. Specifically, in the rotation direction of the wind wheel 200, the distance between the guide wall 143 and the axis X5 of the volute 100 gradually decreases. It can also be understood that the guide wall 143 is curvedly arranged, the guide wall 143 is arc-shaped, or the air inlet channel 140 is arc-shaped. When the wind wheel 200 rotates, a negative pressure is generated in the air duct 110, and the external airflow flows along the guide wall 143. The guide wall 143 can guide the external airflow to rotate in the rotation direction of the wind wheel 200, and the guide effect is better. For example, compared with the guide wall 143 being bent by 90 degrees, the guide effect of the guide wall 143 being curved into an arc shape is better.

[0069] In addition, the guide wall 143 of the present embodiment can also make it difficult for the airflow in the air duct 110 to directly enter the air inlet channel 140 from the outlet 142 of the air inlet channel 140, thereby ensuring that the air inlet channel 140 can only inhale air.

[0070] Referring to Figure 1 As shown, in some embodiments, the air inlet channel 140 is provided with a plurality of air inlet channels 140, and the inlets 141 of the plurality of air inlet channels 140 are arranged at intervals along the circumference of the volute 100, which can further increase the air inlet amount. It can also be understood that the plurality of inlets 141 are arranged in sequence in the rotation direction of the wind wheel 200. In the rotation direction of the wind wheel 200, starting from the position of the volute tongue 150 as the starting point, the first inlet 141 is recorded as the first inlet, which can be understood as the inlet 141 of the air inlet channel 140 located at the head position. The first inlet is closest to the volute tongue 150. The last inlet 141 is recorded as the second inlet, which can be understood as the inlet 141 of the air inlet channel 140 located at the tail position, which is associated with the rotation direction of the wind wheel 200. The second inlet is farthest from the volute tongue 150. In the cross section perpendicular to the axis X5 of the volute 100, the line connecting the first inlet and the axis X5 of the volute 100 is a third line X3, Figure 1The third connecting line X3 is just coincident with the first connecting line X2, the connecting line between the second inlet and the axis X5 of the volute 100 is a fourth connecting line X4, and the included angle between the third connecting line X3 and the fourth connecting line X4 in the rotation direction of the impeller 200 is b, and 5°≤b≤140° is satisfied. It needs to be explained that the included angle b refers to the range of the area from the third connecting line X3 as the starting point to the fourth connecting line X4 as the ending point in the rotation direction of the impeller 200. In this way, the arrangement range of the plurality of air inlet channels 140 can be limited, so that the inlet 141 of the air inlet channel 140 is just located between the first connecting line X2 and the fourth connecting line X4. In this way, the air inlet channel 140 can be away from the position of the diffuser section of the volute 100, so as to ensure that the air inlet channel 140 can only suck air, thereby achieving the effect of compensating the air inlet amount.

[0071] Referring to Figure 2 In some embodiments, the height of the inlet 141 of the air inlet channel 140 along the radial direction of the volute 100 is c, and 2.5mm≤c≤5.5mm is satisfied. In this way, the air inlet effect of the air inlet channel 140 can be better. If c is less than 2.5mm, the air inlet of the inlet 141 of the air inlet channel 140 will not be smooth, and if c is greater than 5.5mm, the airflow in the air duct 110 will easily flow out from the inlet 141 of the air inlet channel 140 to the outside.

[0072] Referring to Figure 2 In some embodiments, the width of the outlet 142 of the air inlet channel 140 along the circumferential direction of the volute 100 is d, and 3mm≤d≤10mm and c≤d are satisfied. In this way, the air inlet effect of the air inlet channel 140 can be better. If d is less than 3mm, the air outlet of the outlet 142 of the air inlet channel 140 will not be smooth, and if d is greater than 10mm, the airflow in the air duct 110 will easily flow out from the outlet 142 of the air inlet channel 140 to the outside.

[0073] Referring to Figure 3 In some embodiments, the distance between the first air inlet 120 and the second air inlet 121 along the axial direction of the volute 100 is e, and the length of the outlet 142 of the air inlet channel 140 is f, and f≤e-20mm is satisfied. In this way, the length of the outlet 142 of the air inlet channel 140 can be ensured to be less than the distance between the first air inlet 120 and the second air inlet 121, so that the outlet 142 is not easily blocked by the volute 100, and the air outlet effect of the outlet 142 is better.

[0074] Referring to Figure 2 and Figure 3As shown, in some embodiments, the air inlet channel 140 is provided with a plurality of reinforcing ribs 144 arranged along the axial direction of the volute 100, which can improve the structural strength. Specifically, the plurality of reinforcing ribs 144 divide the air inlet channel 140 into a plurality of sub-channels 145 arranged along the axial direction of the volute 100, so that the air flows in the plurality of sub-channels 145 can not interfere with each other, improving the air inlet effect. The reinforcing ribs 144 also divide the outlet 142 of the air inlet channel 140 into a plurality of small outlets arranged along the axial direction of the volute 100, i.e., the outlets of the sub-channels 145.

[0075] Referring to Figure 3 As shown, in some embodiments, the length of the outlet of the sub-channel 145 along the axial direction of the volute 100 is g, and satisfies: 15mm≤g≤50mm. Such an arrangement can make the air inlet effect of the sub-channel 145 better. If g is less than 15mm, it will cause the air outlet of the outlet of the sub-channel 145 to be not smooth enough. If g is greater than 50mm, it will cause the air flow in the air duct 110 to easily flow out of the outlet of the sub-channel 145 to the outside.

[0076] Referring to Figure 1 As shown, in some embodiments, the volute 100 comprises a first shell part 160 and a second shell part 170 detachably connected to each other. The first shell part 160 and the second shell part 170 can be understood as substantially U-shaped structures, and each of the first shell part 160 and the second shell part 170 substantially occupies half of the total volume of the volute 100. The air duct 110 and the first air inlet 120 are defined between the first shell part 160 and the second shell part 170. The air outlet channel 130 is formed in the first shell part 160, and the volute tongue 150 and the air inlet channel 140 are formed in the second shell part 170. It should be noted that since the position of the air inlet channel 140 is associated with the volute tongue 150, arranging the volute tongue 150 and the air inlet channel 140 on the second shell part 170 can facilitate the manufacture of the second shell part 170. Since the size parameters of the first shell part 160 are not greatly associated with the air inlet channel 140, the first shell part 160 and the second shell part 170 can be manufactured separately. In addition, dividing the volute 100 into two parts also facilitates the installation and removal of the wind wheel 200 in the air duct 110.

[0077] Referring to Figures 7 to 9As shown in some embodiments, the first shell part 160 is provided with buckles 161 on one or both axial sides of the volute 100, the second shell part 170 is provided with buckle positions 171 corresponding to the buckles 161 on one axial side of the volute 100, and the buckles 161 are buckled with the buckle positions 171. Specifically, the buckles 161 can be elastic buckle cantilever structures, and the buckle positions 171 can be U-shaped structures. The buckles 161 are inserted into the buckle positions 171, so as to lock the first shell part 160 and the second shell part 170. When the first shell part 160 and the second shell part 170 are disassembled and separated, the buckles 161 can be pressed to make the buckles 161 disengage from the buckle positions 171, so that the disassembly and assembly are relatively convenient.

[0078] It should be noted that the centrifugal fan 1000 of the above-mentioned embodiments can be applied to various electrical appliances, such as air handling units, air conditioners, humidifiers, etc.

[0079] Referring to Figure 10 and Figure 11 As shown in some embodiments, the first shell part 160 is provided with a rib plate 172, and the second shell part 170 is provided with a first clamping groove 162. During the installation of the first shell part 160 and the second shell part 170, the rib plate 172 is positioned and matched with the first clamping groove 162, so as to limit the relative movement of the first shell part 160 and the second shell part 170 in the transverse direction, thereby facilitating the connection of the buckles 161 and the buckle positions 171.

[0080] Referring to Figure 4 As shown, the air conditioner indoor unit 2000 provided by the utility model comprises a shell 400, a heat exchanger 430 and the centrifugal fan 1000 of the above-mentioned embodiments. The air conditioner indoor unit 2000 can be a wall-mounted indoor unit or a cabinet-type indoor unit, etc.

[0081] Referring to Figures 4 to 6 As shown, the shell 400 has a cavity 410, one side of the shell 400 is provided with a third air inlet 420 communicating with the cavity 410, the heat exchanger 430 is arranged in the cavity 410 and covers the third air inlet 420, the heat exchanger 430 can be an evaporator, the centrifugal fan 1000 is arranged in the shell 400, the air outlet channel 130 leads the cavity 410 and the outside of the shell 400, the heat exchanger 430 is located between the third air inlet 420 and the centrifugal fan 1000. When the centrifugal fan 1000 works, the cavity 410 generates a negative pressure, and external air flows enter the cavity 410 from the third air inlet 420. In this process, the air flow completes heat exchange with the heat exchanger 430, and then the air flow enters the volute 100 through the first air inlet 120 or the air inlet channel 140, and finally the air flow flows out through the air outlet channel 130. The flow direction of the air flow can refer to the arrow direction in Figure 5 .

[0082] It should be noted that when the centrifugal fan 1000 is used in the air conditioner indoor unit 2000, in some scenarios, considering the problem of equipment volume, the volume of the shell 400 is reduced as much as possible during design, and in addition, the thickness of the volute 100 along the axial direction is large, which may cause the first air inlet 120 or the second air inlet 121 of the volute 100 to be relatively close to the inner wall of the shell 400, and the air inlet is not smooth enough. The centrifugal fan 1000 of the embodiment can compensate for the air inlet amount in the radial direction by arranging the air inlet channel 140 on the outer peripheral wall of the volute 100, so that the centrifugal fan 1000 can be applied to such scenarios.

[0083] Referring to Figure 6 , Figure 7 and Figure 14 , in some embodiments, the air conditioner indoor unit 2000 further comprises a bottom plate component 500, the side of the shell 400 opposite to the third air inlet 420 is provided with a mounting opening 440, the mounting opening 440 is arranged in the height direction of the shell 400, the bottom plate component 500 is installed at the position of the mounting opening 440, and the bottom plate component 500 is fixedly connected with the shell 400 through fasteners, which can be screws, rivets or pins, etc. The bottom plate component 500 is mainly used for installing the centrifugal fan 1000, which can facilitate installation operation. The centrifugal fan 1000 further comprises a connecting plate 300, a rotating shaft 310 and a driving device 320, the volute 100 and the impeller 200 are respectively provided with a plurality of volutes 100 and a plurality of impellers 200, the air ducts 110 of the plurality of volutes 100 and the plurality of impellers 200 are arranged one by one, the plurality of impellers 200 are fixedly connected to the rotating shaft 310 and are arranged in the axial direction of the rotating shaft 310, which can be understood as constituting a connected impeller structure, and the driving device 320 can drive the rotating shaft 310 to rotate. The embodiment drives a plurality of impellers 200 to rotate synchronously through a rotating shaft 310, without arranging a plurality of driving devices 320, which can save cost and reduce the occupied space of the driving device 320. The plurality of volutes 100 are arranged in the height direction of the shell 400, the outer wall of the air outlet channel 130 of the first shell part 160 of the plurality of volutes 100 is fixedly connected to the connecting plate 300, so as to fix the positions of the plurality of first shell parts 160, which facilitates subsequent installation of the connected impeller structure. Since the first shell part 160 opens the air duct 110, the connected impeller structure can be first installed in the air duct 110, and then the second shell part 170 can be installed one by one. The bottom plate component 500 is provided with an opening 510 for avoiding the air outlet channel 130, the opening 510 extends in the height direction of the shell 400, the connecting plate 300 is installed in the opening 510, and the air outlet channel 130 extends outside the bottom plate component 500 through the opening 510, so as to be in communication with the outside. The bottom plate component 500 is further provided with a bearing seat 520, the rotating shaft 310 is rotatably connected to the bearing seat 520, and a bearing 521 is arranged between the bearing seat 520 and the rotating shaft 310, which plays a role of rotating guide and support.

[0084] In the embodiment, the parts of the centrifugal fan 1000 can be mounted on the chassis component 500 first, and then the chassis component 500 is mounted on the mounting port 440, and after installation, the centrifugal fan 1000 is located in the cavity 410. Since the centrifugal fan 1000 is a connected wind wheel structure, it is not necessary to install the wind wheel 200 and the volute 100 one by one, so that the installation steps can be saved and the production efficiency can be improved.

[0085] Referring to Figure 13 In some embodiments, the connecting plate 300 and the chassis component 500 are both provided with first mounting holes 550, and the first screws 560 are matched with the first mounting holes 550, so as to fix the connecting plate 300 and the chassis component 500. The first screws 560 can also be replaced by rivets or pins.

[0086] Referring to Figures 14 to 16 In some embodiments, the centrifugal fan 1000 further includes a gland 530, which is a substantially semicircular structure. The chassis component 500 is further provided with a mounting seat 540, which is arranged opposite to the bearing seat 520. The gland 530 is detachably connected with the mounting seat 540. The gland 530 and the mounting seat 540 define an installation cavity 541 in which the driving device 320 is installed. The gland 530 and the mounting seat 540 can fix the driving device 320. The gland 530 and the mounting seat 540 can be connected by fasteners or buckles 161. The fasteners can be screws, rivets or pins.

[0087] Referring to Figure 15 and Figure 16 In some embodiments, the mounting seat 540 is provided with a clamping hook 544 near one side of the chassis component 500. One side of the gland 530 is provided with a second clamping groove 531 and a pin hole 532. The mounting seat 540 is also provided with a pin hole 532 near the side of the chassis component 500. During the installation of the gland 530, the second clamping groove 531 of the gland 530 can be matched with the clamping hook 544 first to play a positioning role, so that the pin hole 532 of the gland 530 is aligned with the pin hole 532 of the mounting seat 540. Then a pin is inserted into the two pin holes 532, so that one side of the gland 530 can be fixed first. The other side of the gland 530 is provided with a second mounting hole 542. The side of the mounting seat 540 away from the chassis component 500 is also provided with a second mounting hole 542. The second mounting hole 542 is matched with the second screw 543, so as to fix the other side of the gland 530 to the mounting seat 540. In this way, the installation of the gland 530 can be facilitated.

[0088] The embodiment of the utility model further provides a kind of air conditioner, comprising the air conditioner indoor unit 2000 of above-mentioned embodiment.Due to the air conditioner adopts the entire technical scheme of the air conditioner indoor unit 2000 of above-mentioned embodiment, thus at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, which will not be repeated here.

[0089] In the description of the utility model, it is understood that, in relation to orientation description, for example, the orientation or positional relationship of the orientation or positional relationship shown in the drawing is described, only for the convenience of the utility model and simplifying description, and is not indicated or implied that the device or element indicated must have a particular orientation, a particular orientation and operation, so it cannot be understood as the limitation of the utility model.

[0090] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If it is described to first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0091] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of technical scheme.

[0092] The embodiment of the utility model is described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, and within the knowledge range of ordinary skilled in the art, various changes can be made without departing from the purpose of the utility model.

Claims

1. A centrifugal fan, characterized by, The application relates to a centrifugal fan, comprising: a volute provided with an air duct and a volute tongue, the volute being provided with a first air inlet communicated with the air duct along at least one side of the axial direction of the volute, and the volute being provided with an air outlet communicated with the air duct; a fan wheel arranged in the air duct; wherein the outer peripheral wall of the volute is provided with at least one air inlet communicated with the air duct, the air inlet is provided with an inlet and an outlet, the inlet and the outlet are arranged in sequence along the rotation direction of the fan wheel, in a cross section perpendicular to the axis of the volute, the tangent line of the inner wall of the volute tongue and the connecting line of the axis of the volute are a first connecting line, and the connecting line of the inlet of any one of the air inlets and the axis of the volute is a second connecting line, the included angle between the first connecting line and the second connecting line along the rotation direction of the fan wheel is a, and the included angle satisfies 13 DEG <= a <= 155 DEG.

2. The centrifugal fan of claim 1, wherein At least part of the inner wall of the air inlet is constructed as a flow guide wall, and the distance between the flow guide wall and the axis of the volute gradually decreases along the rotation direction of the fan wheel.

3. The centrifugal fan of claim 1, wherein The air inlets are arranged in sequence along the circumferential direction of the volute, the first air inlet is a first inlet, and the last air inlet is a second inlet, the connecting line of the first inlet and the axis of the volute is a third connecting line, the connecting line of the second inlet and the axis of the volute is a fourth connecting line, the included angle between the third connecting line and the fourth connecting line along the rotation direction of the fan wheel is b, and the included angle satisfies 5 DEG <= b <= 140 DEG.

4. The centrifugal fan of claim 1, wherein The height of the inlet along the radial direction of the volute is c, and the height satisfies 2.5 mm <= c <= 5.5 mm.

5. The centrifugal fan of claim 4, wherein The width of the outlet along the circumferential direction of the volute is d, and the width satisfies 3 mm <= d <= 10 mm and c <= d.

6. The centrifugal fan of claim 1, wherein The volute is provided with the first air inlet and a second air inlet along the axial direction of the volute, the distance between the first air inlet and the second air inlet along the axial direction of the volute is e, the length of the outlet is f, and f <= e-20 mm is satisfied.

7. The centrifugal fan of claim 1, wherein The air inlet is provided with a plurality of reinforcing ribs arranged in sequence along the axial direction of the volute, and the reinforcing ribs separate the air inlet into a plurality of sub-channels arranged in sequence along the axial direction of the volute and communicated with the air duct.

8. The centrifugal fan of claim 7, wherein The length of the outlet of the sub-channel along the axial direction of the volute is g, and 15 mm <= g <= 50 mm is satisfied.

9. The centrifugal fan of claim 1, wherein The volute comprises a first shell part and a second shell part detachably connected with each other, the first shell part and the second shell part define the air duct and the first air inlet, the air outlet is formed in the first shell part, and the volute tongue and the air inlet are formed in the second shell part.

10. The centrifugal fan of claim 9, wherein The first shell part is provided with a buckle along at least one side of the axial direction of the volute, the second shell part is provided with a buckle position corresponding to the buckle along one side of the axial direction of the volute, and the buckle and the buckle position are detachably connected.

11. An air conditioner indoor unit characterized by comprising: The application relates to a centrifugal fan, comprising: a shell provided with a cavity, and a third air inlet communicated with the cavity on one side of the shell; a heat exchanger arranged in the cavity and covering the third air inlet. The centrifugal fan according to any one of claims 1 to 10 is arranged in the shell, and the air outlet channel is communicated with the cavity. 12.The indoor unit of the air conditioner of claim 11, characterized in that, The air conditioner indoor unit further comprises a bottom plate component, a mounting opening is arranged on a side of the shell away from the third air inlet, and the bottom plate component is mounted on the mounting opening; and the centrifugal fan is connected to the bottom plate component. 13.The indoor unit of the air conditioner of claim 12, characterized in that, The centrifugal fan further comprises a plurality of the volutes, a plurality of the impellers, a connecting plate, a rotating shaft and a driving device, the plurality of volutes are arranged at intervals along a height direction of the shell, outer walls of the air outlet channels of the plurality of volutes are fixedly connected to the connecting plate, the bottom plate component is provided with an opening for avoiding the air outlet channels, the connecting plate is mounted on the opening, the plurality of impellers are fixedly connected to the rotating shaft, the bottom plate component is provided with a bearing seat, the rotating shaft is rotatably connected to the bearing seat, and the driving device is used for driving the rotating shaft to rotate. 14.The indoor unit of the air conditioner of claim 13, characterized in that, The centrifugal fan further comprises a gland, the bottom plate component is provided with a mounting seat, the gland is detachably connected to the mounting seat, an installation cavity is defined between the gland and the mounting seat, and the driving device is mounted in the installation cavity.

15. An air conditioner characterized by comprising: The air conditioner indoor unit according to any one of claims 11 to 14.

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