Volute air duct and fan heater

Abstract

The volute air duct comprises a volute tongue part and a volute part, the volute tongue part comprises a windward side and an air guide face, the volute part comprises a head section, a middle section and a tail section which are sequentially connected, and the windward side, the middle section of the volute part and the tail section of the volute part form a first air duct for installing a cross-flow wind wheel. The projection of a second point P2 of the head section of the volute part and the projection of a first point P1 of the volute tongue part on the cross-flow wind wheel are both located on the side, close to the volute tongue part, of the central axis of the cross-flow wind wheel in the vertical direction, so that turbulent flow is avoided or reduced in the process that air flow enters the volute air channel and then is exhausted; the airflow is smoothly discharged along the path of the second air duct; based on the design, the air volume flowing back to the first air duct is reduced, when air flow is exhausted from the first air duct, the air flow is divided into two strands to enter the second air duct and flow back to the first air duct, collision of the air flow at the first point P1 is reduced, the air flow is more uniform and stable, and noise is reduced.

Description

Technical Field

[0001] This application relates to the technical field of air - source heat pumps, and particularly to a volute air duct and a warm air blower. Background Art

[0002] As an emerging heating method, air - source heating uses air - source heat pump technology to utilize low - grade energy in the air. Driven by electric energy, it is converted into high - grade energy to achieve heating. This heating method does not consume traditional energy such as gas and fuel, so it does not produce pollutants such as carbon dioxide, which is of great significance to environmental protection. At the same time, the energy efficiency ratio of air - source heating is very high, generally reaching more than 3 - 4, which is more energy - saving than traditional electric heaters, gas heating and other methods. It has received much attention in recent years. Compared with traditional coal - fired, gas - fired and electric heating, air - source heating has many unique advantages.

[0003] However, for the warm air blowers based on air - source heat pumps currently on the market, most of their indoor units use the volute air duct and cross - flow impeller method to achieve air supply. How to reduce the generated noise and improve the stability of the air flow is an important factor affecting the user experience. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a volute air duct and a warm air blower.

[0005] In the first aspect of this application, a volute air duct is provided, which is applied to a cross - flow fan. The cross - flow fan includes a cross - flow impeller and a driving motor. The volute air duct includes a volute part and a volute tongue part. The volute tongue part includes a windward surface and a wind - guiding surface. The volute part includes a head section, a middle section and a tail section connected in sequence;

[0006] The windward surface, the middle section and the tail section form a first air duct, and the cross - flow impeller is installed in the first air duct. The wind - guiding surface and the head section form a second air duct, and the first air duct is communicated with the second air duct;

[0007] The distance between the head section and the axis of the cross - flow impeller gradually increases in the direction away from the middle section. The intersection point between the windward surface and the wind - guiding surface is the first point P1, and the end of the head section is the second point P2. The projections of the second point P2 and the first point P1 on the cross - flow impeller are both located on the side of the vertical central axis of the cross - flow impeller close to the volute tongue part.

[0008] The volute air duct disclosed in the present application includes a volute tongue portion and a volute portion. The volute tongue portion includes a windward surface and a wind guiding surface. The volute portion includes a first section, a middle section, and a tail section connected in sequence. The windward surface, the middle section, and the tail section of the volute portion form a first air duct for installing a cross-flow fan. The wind guiding surface and the first section of the volute portion form a second air duct communicating with the first air duct. The distance between the first section and the axis of the cross-flow fan gradually increases in the direction away from the middle section, playing a pressure boosting role and increasing the air outlet pressure. Since the projections of the second point P2 at the end of the first section of the volute portion and the first point P1 on the volute tongue portion on the cross-flow fan are both on the side of the vertical central axis of the cross-flow fan close to the volute tongue portion, during the process of air flow entering and then discharging from the volute air duct, the generation of turbulence in the air duct can be avoided or reduced, enabling the air flow to be smoothly discharged along the path of the second air duct. Based on the above air duct design, not only can the air volume flowing back to the first air duct be reduced, but also when the air flow is discharged from the first air duct, the air flow can be divided into two streams and enter the second air duct and the first air duct respectively, reducing the collision of the air flow at the intersection of the windward surface and the wind guiding surface, making the air flow more uniform and stable, thereby achieving noise reduction.

[0009] In one embodiment, the starting end of the tail section is the third point P3. A first included angle θ1 is formed between the connection line of the second point P2 and the axis of the cross-flow fan and the connection line of the third point P3 and the axis of the cross-flow fan. The first included angle θ1 satisfies: 148 ≤ θ1 ≤ 155°.

[0010] In one embodiment, a second included angle θ2 is formed between the connection line of the first point P1 and the axis of the cross-flow fan and the connection line of the second point P2 and the axis of the cross-flow fan. The second included angle θ2 satisfies: 10 ≤ θ2 ≤ 14°.

[0011] In one embodiment, the starting end of the windward surface is the fourth point P4. A third included angle θ3 is formed between the connection line of the first point P1 and the axis of the cross-flow fan and the connection line of the fourth point P4 and the axis of the cross-flow fan. The third included angle θ3 satisfies: 45 ≤ θ3 ≤ 55°.

[0012] In one embodiment, a fourth included angle θ4 is formed between the connection line of the fourth point P4 and the axis of the cross-flow fan and the horizontal central axis of the cross-flow fan. The fourth included angle θ4 satisfies: -10 ≤ θ4 ≤ 17°.

[0013] In one embodiment, a fifth included angle θ5 is formed between the connection line of the fourth point P4 and the axis of the cross-flow fan and the connection line of the third point P3 and the axis of the cross-flow fan. The fifth included angle θ5 satisfies: 130 ≤ θ5 ≤ 150°.

[0014] In one embodiment, the minimum distance between the windward surface and the cross-flow impeller is S1, and S1 satisfies: 4 ≤ S1 ≤ 6 mm.

[0015] In one embodiment, the minimum distance between the volute part and the cross-flow impeller is S2, and S2 satisfies: 4 ≤ S2 ≤ 6 mm.

[0016] In one embodiment, the volute part further includes an extension section, and the extension section extends in a direction opposite to the direction in which the volute tongue part protrudes from the second point P2.

[0017] The second aspect of the present application provides a heater, which includes an indoor unit and an outdoor unit. The indoor unit is connected to the outdoor unit through a pipeline, and the outdoor unit is used to output high-temperature and high-pressure gaseous refrigerant to the indoor unit;

[0018] The indoor unit includes: a cross-flow fan, a condenser, a housing, and the volute air duct as described above;

[0019] The condenser and the volute air duct are installed in the housing. The volute air duct and the condenser are sequentially distributed from bottom to top along the height direction of the housing. The condenser is designed to be inclined with respect to the height direction of the housing. The extension section, the condenser, the inner wall of the housing, and the volute tongue part are sequentially connected and enclose to form a wind guiding channel;

[0020] The housing is provided with an air inlet and an air outlet. The cross-flow fan is used to suck air at the air inlet, and sequentially transport the air through the volute air duct and the wind guiding channel to the condenser for heat absorption and then discharge it from the air outlet.

[0021] In one embodiment, a flow guiding piece is arranged in the wind guiding channel, and the flow guiding piece is used to change the direction of part of the air flow discharged from the volute air duct to increase the contact area between the air flow and the condenser.

[0022] In one embodiment, the bottom plate and the side plate of the housing are respectively provided with a first through hole and a second through hole communicated with the air inlet end of the volute air duct. The second through hole is distributed at the bottom of the side plate of the housing, and both the first through hole and the second through hole are the air inlets. Description of the Drawings

[0023] Figure 1 is one of the sectional views of the volute air duct in one embodiment;

[0024] Figure 2 is the second sectional view of the volute air duct in one embodiment;

[0025] Figure 3 is the sectional view of the indoor unit in one embodiment.

[0026] Reference numerals:

[0027] 100 volute part, 110 first section, 120 middle section, 130 tail section, 140 extension section;

[0028] 200 volute tongue part, 210 windward surface, 220 air guiding surface;

[0029] 300 first air duct, 400 second air duct;

[0030] 1 indoor unit, 111 cross-flow impeller, 12 condenser, 13 housing, 14 guide vane, 101 air guiding channel, 103 air inlet, 104 air outlet, 105 first channel, 106 second through hole. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so as to describe the embodiments of the present application here.

[0033] As Figures 1 to 3 shown, this embodiment provides a volute air duct, which is applied to a cross-flow fan. The cross-flow fan includes a cross-flow impeller 111 and a driving motor. The volute air duct 10 includes a volute part 100 and a volute tongue part 200. The volute tongue part 200 includes a windward surface 210 and an air guiding surface 220. The volute part 100 includes a first section 110, a middle section 120 and a tail section 130 connected in sequence;

[0034] The windward surface 210 and the middle section 120, the tail section 130 form a first air duct 300. The cross-flow impeller 111 is installed in the first air duct 300. The air guiding surface 220 and the first section 110 form a second air duct 400. The first air duct 300 is communicated with the second air duct 400;

[0035] The distance between the axis of the first section 110 and the axis of the cross-flow impeller 111 gradually increases in the direction away from the middle section 120. The intersection point between the windward surface 210 and the air guiding surface 220 is the first point P1, and the end of the first section 110 is the second point P2. The projections of the second point P2 and the first point P1 on the cross-flow impeller 111 are both located on the side of the vertical central axis of the cross-flow impeller 111 closer to the volute tongue part 200.

[0036] Among them, the drive motor can drive the cross-flow impeller 111 to rotate in the volute air duct 10. Specifically, the cross-flow impeller 111 rotates counterclockwise in the first air duct 300 in the direction towards the volute tongue part 200, and the air flow formed in the first air duct 300 is discharged towards the second air duct 400. It can be understood that when the air flow flows from the first air duct 300 to the second air duct 400, the air flow is easily divided into two air flows when it encounters the protruding part of the volute tongue part 200. Most of the air flow can be discharged along the second air duct 400, and a small part of the air flow returns to the first air duct 300 along the gap between the windward surface 210 of the volute tongue part 200 and the cross-flow impeller 111. This part of the air flow and the newly inhaled air flow rotate in the first air duct 300 following the rotation of the cross-flow impeller 111.

[0037] Based on the fact that the projections of the second point P2 and the first point P1 on the cross-flow impeller 111 are both on the side of the vertical central axis of the cross-flow impeller 111 closer to the volute tongue part 200, and the distance between the axis of the first section 110 and the axis of the cross-flow impeller 111 gradually increases in the direction away from the middle section 120. Specifically, taking the axis of the cross-flow impeller 111 as the origin to establish a two-dimensional coordinate system, both the first point P1 and the second point P2 are distributed in the second quadrant. The first section 110 is along the Y-axis direction in the two-dimensional coordinate system, and the Y-axis value gradually increases, and the Y-axis value of the second point P2 is greater than the Y-axis value of the first point P1. Based on the above design, when the air flow enters the second air duct 400 from the first air duct 300 and then is discharged from the second air duct 400, it can avoid or reduce the generation of turbulence, enable the air flow to be smoothly discharged along the path of the second air duct 400, and reduce the air volume flowing back to the first air duct 300; in addition, when the air flow is discharged from the first air duct 300, the air flow is divided into two parts along the trend and enters the second air duct 400 and the first air duct 300 respectively, reducing the collision of the air flow at the intersection of the windward surface 210 and the air guiding surface 220, making the air flow more uniform and stable, thus achieving noise reduction.

[0038] The volute air duct in the above embodiments includes a volute tongue portion 200 and a volute portion 100. The volute tongue portion 200 includes a windward surface 210 and a wind guiding surface 220. The volute portion 100 includes a first section 110, a middle section 120, and a tail section 130 that are connected in sequence. The windward surface 210 and the middle section 120 and the tail section 130 of the volute portion 100 form a first air duct 300 for installing a cross-flow fan 111. The wind guiding surface 220 and the first section 110 of the volute portion 100 form a second air duct 400 that communicates with the first air duct 300. The distance between the first section 110 and the axis of the cross-flow fan 111 gradually increases in the direction away from the middle section 120, which plays a pressure boosting role and increases the air outlet pressure. The projections of the second point P2 at the end of the first section 110 of the volute portion 100 and the first point P1 on the volute tongue portion 200 on the cross-flow fan 111 are both on the side of the vertical central axis of the cross-flow fan 111 close to the volute tongue portion 200, which can avoid or reduce the generation of turbulence in the air duct during the process of the air flow entering the volute air duct 10 and being discharged, so that the air flow can be smoothly discharged along the path of the second air duct 400. Based on the above air duct design, not only can the air volume flowing back to the first air duct 300 be reduced, but also when the air flow is discharged from the first air duct 300, the air flow is divided into two strands and enters the second air duct 400 and the first air duct 300 that flows back respectively, reducing the collision of the air flow at the intersection of the windward surface 210 and the wind guiding surface 220, making the air flow more uniform and stable, thereby achieving noise reduction.

[0039] As Figure 1 and Figure 2 shown, in addition to the features of the above embodiments, this embodiment further defines that: the starting end of the tail section 130 is the third point P3, and a first included angle θ1 is formed between the line connecting the second point P2 and the axis of the cross-flow fan 111 and the line connecting the third point P3 and the axis of the cross-flow fan 111. The first included angle θ1 satisfies: 148 ≤ θ1 ≤ 155°.

[0040] In the above embodiments, it is further defined that the first included angle θ1 formed between the line connecting the second point P2 and the axis of the cross-flow fan 111 and the line connecting the third point P3 and the axis of the cross-flow fan 111 satisfies 148 ≤ θ1 ≤ 155°, which can ensure that during the process of the air flow entering the volute air duct 10 and being discharged, it can be smoothly discharged along the path of the second air duct 400 and avoid the generation of turbulence in the channel.

[0041] Among them, the first included angle θ1 can be 148 ≤ θ1 ≤ 155°. For example, the first included angle θ1 = 152°.

[0042] As Figure 2 shown, in addition to the features of the above embodiments, this embodiment further defines that: a second included angle θ2 is formed between the line connecting the first point P1 and the axis of the cross-flow fan 111 and the line connecting the second point P2 and the axis of the cross-flow fan 111. The second included angle θ2 satisfies: 10 ≤ θ2 ≤ 14°.

[0043] In the above embodiments, it is further defined that the second included angle θ2 formed between the line connecting the first point P1 and the axis of the cross-flow impeller 111 and the line connecting the second point P2 and the axis of the cross-flow impeller 111 satisfies 10 ≤ θ2 ≤ 14°. Based on the above design, the air flow discharged from the second air duct 400 can be transmitted within a suitable angle range, while ensuring that the flow velocity of the air flow is not prone to backflow.

[0044] Among them, the second included angle θ2 can be 10 ≤ θ2 ≤ 14°. For example, the second included angle θ2 = 12°. Exemplarily, when the volute air duct 10 of the present application is applied to a warm air blower based on an air source heat pump, the volute air duct 10 and the condenser 12 are installed in the housing 13. If the second included angle θ2 is too small, the air flow discharged through the second air duct 400 flows towards the condenser 12 at a small range of angles, resulting in too small a contact area between the air flow and the condenser 12 and low heat utilization efficiency; if the second included angle θ2 is too large, it is easy to cause a decrease in the air flow pressure at the outlet of the second air duct 400, causing more air flow to flow back to the first air duct 300 and low air outlet efficiency.

[0045] As Figure 2 shown, in addition to the features of the above embodiments, this embodiment further defines that: the starting end of the windward surface 210 is the fourth point P4, and a third included angle θ3 is formed between the line connecting the first point P1 and the axis of the cross-flow impeller 111 and the line connecting the fourth point P4 and the axis of the cross-flow impeller 111, and the third included angle θ3 satisfies: 45 ≤ θ3 ≤ 55°.

[0046] In the above embodiments, it is further defined that the third included angle θ3 formed between the line connecting the first point P1 and the axis of the cross-flow impeller 111 and the line connecting the fourth point P4 and the axis of the cross-flow impeller 111 satisfies 45 ≤ θ3 ≤ 55°. Based on the above design, the noise caused by the air flow flowing back to the first air duct 300 and impacting the windward surface 210 when following the rotation of the cross-flow impeller 111 can be reduced.

[0047] Among them, the third included angle θ3 can be 45 ≤ θ3 ≤ 55°. For example, the third included angle θ3 = 49°. It should be noted that the gap between the windward surface 210 and the outer contour of the cross-flow impeller 111 forms a smooth channel that matches the internal eccentric vortex streamline of the cross-flow impeller 111. This smooth channel can make the air flow transition more natural and smooth, and then gradually differentiate and slow down the impact of the air flow to adapt to the change when the air flow driven by the cross-flow impeller 111 returns from the windward surface 210 side of the volute tongue to the inner side of the air duct. When the third included angle θ3 is too small or too large, the formation of this smooth channel will be affected, which may lead to insufficiently natural air flow transition, increased air flow impact, and thus noise generation.

[0048] As Figure 2As shown, in addition to the features of the above embodiments, this embodiment further defines that: the fourth angle θ4 is formed between the line connecting the fourth point P4 and the axis of the cross-flow impeller 111 and the horizontal central axis of the cross-flow impeller 111, and the fourth angle θ4 satisfies: -10 ≤ θ4 ≤ 17°.

[0049] In the above embodiment, it is further defined that the fourth angle θ4 formed between the line connecting the fourth point P4 and the axis of the cross-flow impeller 111 and the horizontal central axis of the cross-flow impeller 111 satisfies -10 ≤ θ4 ≤ 17°. Among them, when the fourth point P4 is in the second quadrant, the fourth angle θ4 satisfies 0 ≤ θ4 ≤ 17°, and when the fourth point P4 is in the third quadrant, the fourth angle θ4 satisfies -10 ≤ θ4 ≤ 0°.

[0050] Among them, the fourth angle θ4 can be -10 ≤ θ4 ≤ 17°. For example, the fourth angle θ4 = 17°.

[0051] As Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the fifth angle θ5 is formed between the line connecting the fourth point P4 and the axis of the cross-flow impeller 111 and the line connecting the third point P3 and the axis of the cross-flow impeller 111, and the fifth angle θ5 satisfies: 130 ≤ θ5 ≤ 150°.

[0052] In the above embodiment, it is further defined that the fifth angle θ5 formed between the line connecting the fourth point P4 and the axis of the cross-flow impeller 111 and the line connecting the third point P3 and the axis of the cross-flow impeller 111 satisfies 130 ≤ θ5 ≤ 150°. Based on the above design, the air intake volume can be increased, thereby reducing the resistance of the air inlet 103, effectively improving the air flow situation, and improving the ventilation efficiency, thereby avoiding the phenomenon of air stagnation.

[0053] Among them, the fifth angle θ5 can be 130 ≤ θ5 ≤ 150°. For example, the fifth angle θ5 = 148°.

[0054] As Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the minimum distance S1 between the windward surface 210 and the cross-flow impeller 111 satisfies: 4 ≤ S1 ≤ 6 mm.

[0055] In the above embodiments, it is further defined that the minimum distance S1 between the windward surface 210 and the cross-flow impeller 111 satisfies 4 ≤ S1 ≤ 6 mm. Based on the above design, the air suction efficiency of the volute air duct 10 is improved, and it is avoided that the noise increases and / or the air flow rate decreases due to too small or too large clearance between the volute tongue part 200 and the cross-flow impeller 111. It should be noted that when the clearance between the windward surface 210 and the cross-flow impeller 111 increases, the noise level decreases, but the recirculation flow increases, resulting in a decrease in the flow rate. When the clearance between the windward surface 210 and the cross-flow impeller 111 decreases, the flow rate increases and the noise increases, but if the clearance is too small, the flow resistance will increase and the flow rate may decrease sharply. Among them, S1 satisfies: 4 ≤ S1 ≤ 6 mm. For example, S1 = 4 mm.

[0056] As Figure 2 shown, in addition to the features of the above embodiments, this embodiment further defines that: the minimum distance S2 between the volute part 100 and the cross-flow impeller 111 satisfies 4 ≤ S2 ≤ 6 mm.

[0057] In the above embodiments, it is further defined that the minimum distance S2 between the volute part 100 and the cross-flow impeller 111 satisfies 4 ≤ S2 ≤ 6 mm. Based on the above design, the air suction efficiency of the volute air duct 10 is improved, and it is avoided that the noise increases and / or the air flow rate decreases due to too small or too large clearance between the volute tongue part 200 and the cross-flow impeller 111. Among them, S2 satisfies: 4 ≤ S2 ≤ 6 mm. For example, S2 = 4 mm.

[0058] As Figure 1 and Figure 2 shown, in addition to the features of the above embodiments, this embodiment further defines that: the volute part 100 further includes an extension section 140, and the extension section 140 extends in the opposite direction to the direction in which the volute tongue part 200 protrudes from the second point P2.

[0059] As Figures 1 to 3 shown, this embodiment provides a warm air blower, which includes an indoor unit 1 and an outdoor unit. The indoor unit 1 is connected to the outdoor unit through a pipeline, and the outdoor unit is used to output high-temperature and high-pressure gaseous refrigerant to the indoor unit 1;

[0060] The indoor unit 1 includes: a cross-flow fan, a condenser 12, a housing 13, and a volute air duct 10;

[0061] The condenser 12 and the volute air duct 10 are installed in the housing 13. The volute air duct 10 and the condenser 12 are arranged in sequence from bottom to top along the height direction of the housing 13. The condenser 12 is designed to be inclined with respect to the height direction of the housing 13. The extension section 140, the condenser 12, the inner wall of the housing 13, and the volute tongue part 200 are sequentially connected and enclose to form a wind guiding channel 101;

[0062] The housing 13 is provided with an air inlet 103 and an air outlet 104. The cross-flow fan is used to suck in the air flow at the air inlet 103, and sequentially deliver it to the condenser 12 through the volute air duct 10 and the air guide channel 101 for heat absorption, and then discharge it from the air outlet 104.

[0063] Among them, the outdoor unit can be used to provide high-temperature and high-pressure gaseous refrigerant to the condenser 12 of the indoor unit 1. Specifically, the outdoor unit may include a compressor, a liquid storage tank, a filter, an expander, and an evaporator. The low-temperature and low-pressure liquid refrigerant absorbs the heat of the outdoor air in the evaporator, causing the low-temperature and low-pressure liquid refrigerant to evaporate into a gaseous state. The gaseous refrigerant is transported into the compressor for compression to obtain high-temperature and high-pressure gaseous refrigerant, and then transported to the condenser 12 for condensation and heat release. At this time, the volute air duct 10 sends the sucked air flow to the surface of the condenser 12 to absorb heat, thereby obtaining hot air; the high-pressure and medium-temperature liquid refrigerant after condensation is transported to the expansion valve for throttling to reduce its temperature and pressure, so that the refrigerant entering the evaporator becomes wet vapor with a relatively low saturation temperature;

[0064] The extension section 140 extends from the second point P2 towards the bottom of the condenser 12. The air guide surface 220 of the volute tongue portion 200 abuts against the side wall of the housing 13, and the upper top of the condenser 12 abuts against the side wall of the housing 13. Thus, the extension section 140, the condenser 12, the side wall of the housing 13, and the windward surface 210 form an air guide cavity. The air flow directly enters the air guide channel 101 after being discharged from the second air duct 400, and then is distributed to the surface of the condenser 12 for heat absorption. Based on the above design, it is possible to avoid the need to additionally design a complex air duct inside the housing 13, simplify the internal structure of the indoor unit 1, and further reduce the volume of the indoor unit 1.

[0065] As Figure 3 shown, in addition to the features of the above embodiments, this embodiment further defines that: a deflector 14 is provided in the air guide channel 101 for changing the direction of part of the air flow discharged from the volute air duct 10 to increase the contact area between the air flow and the condenser 12.

[0066] In the above embodiments, it is further defined that a deflector 14 is provided in the air guide channel 101. The deflector 14 is used to adjust the direction of part of the air flow discharged by the fan assembly, so that the air flow discharged by the fan assembly can cover the entire condenser 12 as much as possible, increasing the contact area between the air flow and the condenser 12. Thus, more heat can be absorbed per unit time, improving the heat absorption efficiency of the air flow, and thereby obtaining a better hot air effect.

[0067] Among them, the flow guide member can be used to adjust the direction of the air flow discharged from the volute air duct 10. The flow guide member can be a housing structure with a certain shape. After the air flow discharged from the fan assembly encounters the flow guide member, the original wind direction changes. According to the positional relationship between the air outlet direction of the fan assembly and the condenser 12, the flow guide member is adaptively set so that the air flow discharged from the fan assembly can cover the entire condenser 12 as much as possible, increasing the contact area between the air flow and the condenser 12.

[0068] As Figure 1 shown, in addition to the features of the above embodiments, this embodiment further defines that: the bottom plate and the side plate of the housing 13 are respectively provided with a first through hole 105 and a second through hole 106 communicating with the air inlet end of the volute air duct 10. The second through hole 106 is distributed at the bottom of the side plate of the housing 13. Both the first through hole 105 and the second through hole 106 are air inlets 103.

[0069] In the above embodiment, it is further defined that both the bottom plate and the side plate of the housing 13 are provided with air inlets 103. Among them, the second through hole 106 on the side plate of the housing 13 serves as an auxiliary air inlet 103, and the first through hole 105 on the bottom plate of the housing 13 serves as a core air inlet 103. By respectively providing the second through hole 106 and the first through hole 105 on the side plate and the bottom plate of the housing 13, the air intake volume can be increased, the air flow rate for heat absorption per unit time increases, and the heating efficiency is improved.

[0070] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0071] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A volute air duct is applied to a cross-flow fan. The cross-flow fan includes a cross-flow impeller (111) and a driving motor. The volute air duct (10) includes a volute part (100) and a volute tongue part (200). The volute tongue part (200) includes a windward surface (210) and a wind guiding surface (220). The volute part (100) includes a head section (110), a middle section (120) and a tail section (130) which are connected in sequence. It is characterized in that, The windward surface (210) and the middle section (120), the tail section (130) form a first air duct (300). The cross-flow impeller (111) is installed in the first air duct (300). The wind guiding surface (220) and the head section (110) form a second air duct (400). The first air duct (300) is communicated with the second air duct (400); The distance between the head section (110) and the axis of the cross-flow impeller (111) gradually increases in the direction away from the middle section (120). The intersection point between the windward surface (210) and the wind guiding surface (220) is the first point P1. The end of the head section (110) is the second point P2. The projections of the second point P2 and the first point P1 on the cross-flow impeller (111) are both located on the side of the vertical central axis of the cross-flow impeller (111) close to the volute tongue part (200).

2. The volute air duct according to claim 1, characterized in that, The starting end of the tail section (130) is the third point P3. A first included angle θ1 is formed between the connection line of the second point P2 and the axis of the cross-flow impeller (111) and the connection line of the third point P3 and the axis of the cross-flow impeller (111). The first included angle θ1 satisfies: 148 ≤ θ1 ≤ 155°.

3. The volute air duct according to claim 2, characterized in that A second included angle θ2 is formed between the connection line of the first point P1 and the axis of the cross-flow impeller (111) and the connection line of the second point P2 and the axis of the cross-flow impeller (111). The second included angle θ2 satisfies: 10 ≤ θ2 ≤ 14°.

4. The volute air duct according to claim 2, characterized in that The starting end of the windward surface (210) is the fourth point P4. A third included angle θ3 is formed between the connection line of the first point P1 and the axis of the cross-flow impeller (111) and the connection line of the fourth point P4 and the axis of the cross-flow impeller (111). The third included angle θ3 satisfies: 45 ≤ θ3 ≤ 55°.

5. The volute air duct according to claim 4, wherein, A fourth included angle θ4 is formed between the connection line of the fourth point P4 and the axis of the cross-flow impeller (111) and the horizontal central axis of the cross-flow impeller (111). The fourth included angle θ4 satisfies: -10 ≤ θ4 ≤ 17°.

6. The volute air duct according to claim 5, characterized in that, A fifth included angle θ5 is formed between the connection line of the fourth point P4 and the axis of the cross-flow impeller (111) and the connection line of the third point P3 and the axis of the cross-flow impeller (111). The fifth included angle θ5 satisfies: 130 ≤ θ5 ≤ 150°.

7. The volute air duct according to claim 5, characterized in that, The minimum distance between the windward surface (210) and the cross-flow impeller (111) is S1. The S1 satisfies: 4 ≤ S1 ≤ 6 mm; and / or, The minimum distance between the volute part (100) and the cross-flow impeller (111) is S2, and S2 satisfies: 4 ≤ S2 ≤ 6 mm.

8. The volute air duct according to any one of claims 1-7, characterized in that, The volute part (100) further includes an extension section (140), and the extension section (140) extends in a direction opposite to the direction in which the volute tongue part (200) protrudes from the second point P2.

9. A heater, comprising an indoor unit (1) and an outdoor unit, the indoor unit (1) being connected to the outdoor unit through a pipeline, the outdoor unit being configured to output high-temperature and high-pressure gaseous refrigerant to the indoor unit (1), characterized in that the indoor unit (1) includes: a cross-flow fan (11), a condenser (12), a housing (13), and a volute air duct (10) as described in claim 8 above; The condenser (12) and the volute air duct (10) are installed in the housing (13), the volute air duct (10) and the condenser (12) are sequentially distributed from bottom to top along the height direction of the housing (13), the condenser (12) is inclined with respect to the height direction of the housing (13), and the extension section (140), the condenser (12), the inner wall of the housing (13), and the volute tongue part (200) are sequentially connected and enclose to form an air guiding channel (101); The housing (13) is provided with an air inlet (103) and an air outlet (104), the cross-flow fan (11) is configured to suck air flow at the air inlet (103), and the air flow is sequentially transported through the volute air duct (10) and the air guiding channel (101) to the condenser (12) for heat absorption and then discharged from the air outlet (104).

10. The heater according to claim 9, characterized in that a flow guiding vane (14) is arranged in the air guiding channel (101), and the flow guiding vane (14) is configured to change the direction of part of the air flow discharged from the volute air duct (10) so as to increase the contact area between the air flow and the condenser (12); and / or a first through hole (105) and a second through hole (106) communicating with the air inlet end of the volute air duct (10) are respectively formed in the bottom plate and the side plate of the housing (13), the second through hole (106) is distributed at the bottom of the side plate of the housing (13), and both the first through hole (105) and the second through hole (106) are the air inlet (103).

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