Through-flow fans and air conditioners

Abstract

This application provides a once-through fan and an air conditioner, and belongs to the technical field of air conditioning technology. The once-through fan includes a housing, a volute casing, a volute tongue, and a once-through impeller. Both the volute casing and the volute tongue are connected to the housing, and an intake passage and an exhaust passage are formed between the volute casing and the volute tongue. The volute tongue has a recirculation passage, the intake port of the recirculation passage is connected to the exhaust passage, and the exhaust port of the recirculation passage is connected to the intake passage. The once-through impeller is located within the volute casing, installed between the intake passage and the exhaust passage, and rotatably connected to the housing. In a direction parallel to the axis of the once-through impeller, the recirculation passage is located in the center of the volute tongue, and its length is shorter than the total length of the volute tongue. Using this application, the position of the eccentric vortex can be made more stable, thereby improving the pressure resistance of the once-through fan, reducing or delaying stall, thereby avoiding noise generation, and the difficulty and time of processing can be reduced, improving the processing efficiency of the once-through fan.

Description

Technical Field

[0001] <Cross - reference to Related Cases> This application claims priority from a Chinese patent application with application number 202311555005.6, invention title "Cross - flow fan and air conditioner", filed on November 20, 2023, and the entire content of this Chinese patent application is incorporated herein by reference.

[0002] This application relates to the technical field of air conditioners, specifically, to cross - flow fans and air conditioners.

Background Art

[0003] The cross - flow fan includes a housing, a volute casing, a volute tongue, and a cross - flow impeller. Generally, an intake passage and an exhaust passage are formed between the volute casing and the volute tongue. The gas enters the intake passage under the action of the cross - flow impeller, reaches the volute tongue, and then is guided along the surface of the volute tongue into the exhaust passage for further processing. <(

[0004] However, in the above structure, when the system resistance of the cross - flow fan increases (for example, when the intake passage and the exhaust passage are blocked), the gas flowing inside it is prone to stall, thereby reducing the stability of the gas flow, making surge extremely likely to occur, and further increasing the noise rapidly.

Summary of the Invention

[0005] The embodiments of this application provide a cross - flow fan and an air conditioner, which can solve the technical problems existing in the related art. The technical solutions of the cross - flow fan and the air conditioner are as follows.

[0006] On the one hand, embodiments of the present application provide a once-through fan comprising a housing, a volute casing, a volute tongue, and a once-through impeller, wherein both the volute casing and the volute tongue are connected to the housing, an intake passage and an exhaust passage are formed between the volute casing and the volute tongue, the volute tongue has a recirculation passage, the intake port of the recirculation passage is in communication with the exhaust passage, the exhaust port of the recirculation passage is in communication with the intake passage, the once-through impeller is located inside the volute casing and between the intake passage and the exhaust passage and is rotatably connected to the housing, the recirculation passage is located in the center of the volute tongue in a direction parallel to the axis of the once-through impeller, and the length of the recirculation passage is less than the total length of the volute tongue.

[0007] In one possible embodiment, the spiral tongue further has a guide surface, a leeward surface and a leeward surface, the through-flow impeller is located between the guide surface and the spiral casing, the intake passage is formed between the leeward surface and the spiral casing, the exhaust passage is formed between the leeward surface and the spiral casing, the intake port is located on the leeward surface and the exhaust port is located on the leeward surface.

[0008] In one possible embodiment, the leading edge region of the guide surface is connected to the windward surface, and the trailing edge region of the guide surface is connected to the leeward surface, wherein the leading edge region and the trailing edge region are arcuate surfaces.

[0009] In one possible embodiment, the shortest distance between the leading edge region and the circumference of the outer diameter of the through-flow impeller is a*D, the shortest distance between the trailing edge region and the circumference of the outer diameter of the through-flow impeller is b*D, the radius of the leading edge region is c*D, where the range of the value of a is [0.05, 0.07], the range of the value of b is [0.03, 0.05], the range of the value of c is [0.05, 0.07], and D is the outer diameter of the through-flow impeller.

[0010] In one possible embodiment, the shortest distance between the intake port and the leading edge region is e*D, and the shortest distance between the exhaust port and the trailing edge region is f*D, where the range of e is [0.15, 0.3], the range of f is [0.1, 0.15], and D is the outer diameter of the through-flow impeller.

[0011] In one possible embodiment, the range of values ​​for the angle between the intake direction of the intake port and the portion of the windward surface near the leading edge region is [45 degrees, 90 degrees].

[0012] In one possible embodiment, the circumference of the outer diameter of the through-flow impeller is in contact with the exhaust direction of the exhaust port.

[0013] In one possible embodiment, the length of the return passage in a direction parallel to the axis of the through-impeller is m times the total length of the spiral tongue, where the value of m is in the range of [0.5, 0.95].

[0014] In one possible embodiment, the surface of the spiral tongue is provided with a plurality of flow guide teeth, which are arranged along a direction parallel to the axis of the through-flow impeller, and the direction of extension of the flow guide teeth is in the direction of extension of the intake passage toward the exhaust passage.

[0015] In one possible embodiment, the flow guide teeth are distributed at both ends of the spiral tongue.

[0016] In one possible embodiment, the lengths of the plurality of flow guide teeth in a direction parallel to the axis of the through-flow impeller are n times the total length of the spiral tongue, where the range of n is [0.05, 1].

[0017] In another embodiment, an embodiment of the present application provides an air conditioner which includes a through-fan as described in any of the above.

[0018] The technical solutions provided by embodiments of this application include at least the following beneficial effects. Embodiments of this application provide a once-through fan in which the vortex tongue has a recirculation passage, and the exhaust port of the recirculation passage communicates with an intake passage, so that some of the gas in the exhaust passage can flow to the exhaust port through the recirculation passage, and this gas can control the gas around the once-through impeller in the intake passage, thereby stabilizing the position of the eccentric vortices generated during the operation of the once-through impeller, improving the pressure resistance of the once-through fan, reducing and delaying stall, and thereby avoiding noise generation.

[0019] Furthermore, in a once-through fan, the gas flow velocity is relatively high in the center of the spiral tongue, and relatively low at both ends of the spiral tongue. Problems such as stalling are more likely to occur at both ends of the spiral tongue, and the recirculation effect is not significant at both ends of the spiral tongue in the recirculation passage. Therefore, by setting the length of the recirculation passage shorter than the total length of the spiral tongue in a direction parallel to the axis of the once-through impeller, and by installing the recirculation passage in the center of the spiral tongue, it is not necessary to install recirculation passages at both ends of the spiral tongue where the recirculation effect is not significant. This structure does not significantly affect the performance improvement of the once-through fan compared to a structure in which recirculation passages are installed in both the center and both ends of the spiral tongue, and further reduces the difficulty and time of processing, improving the processing efficiency of the once-through fan.

[0020] Please understand that the above general description and the following detailed description are for illustrative and illustrative purposes only and do not limit this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the following is a brief introduction to the drawings necessary for describing the embodiments. Clearly, the drawings described below are only a part of the embodiments of this application. Those skilled in the art can obtain other drawings based on these without any creative work. [Brief explanation of the drawing]

[0022] [Figure 1] This is a cross-sectional view of a through-flow fan shown in the embodiment of this application. [Figure 2]It is a schematic diagram of the structure of the volute tongue shown in the embodiment of the present application. [Figure 3] It is an enlarged view of a partial E part of FIG. 2 shown in the embodiment of the present application. [Figure 4] It is a cross-sectional view of the volute casing, volute tongue and tubular impeller shown in the embodiment of the present application. [Figure 5] It is a schematic diagram of the structure of the volute casing, volute tongue and tubular impeller shown in the embodiment of the present application.

Embodiments for Carrying Out the Invention

[0023] Detailed drawing reference numerals 1 Housing, 2 Volute casing, 3 Volute tongue, 4 Tubular impeller, 5 Heat exchanger, 31 Return flow path, 32 Guide surface, 33 Wind lower surface, 34 Wind upper surface, 35 Deflector teeth, 31a Intake port, 31b Exhaust port, 321 Leading edge region, 322 Trailing edge region, A Intake passage, B Exhaust passage

[0024] Technical terms or scientific terms used in this specification shall have the ordinary meanings understood by those skilled in the technical field to which this application belongs. The "first", "second", "third", and similar terms used in the patent specification and claims of this application do not indicate order, quantity, or importance, but are merely used to distinguish different components. Similarly, similar terms such as "one" or "a" do not indicate a limitation of quantity, but indicate that at least one exists. Similar phrases such as "comprising" or "including" mean that the element or article appearing before "comprising" or "including" includes the elements or articles listed after "comprising" or "including" and their equivalents, and do not exclude other elements or articles. Similar phrases such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections whether direct or indirect. "Upper", "lower", "left", "right", etc. are merely used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationships may also change correspondingly.

[0025] To more clearly illustrate the purpose, technical solution, and advantages of the present application, the embodiments of the present application will be described in more detail below with reference to the drawings.

[0026] Embodiments of the present application provide a cross-flow fan. Referring to FIG. 1, the cross-flow fan includes a housing 1, a scroll casing 2, a scroll tongue 3, and a cross-flow impeller 4.

[0027] Here, the housing 1 may have any suitable shape. For example, it may have a cuboid shape or a cylindrical shape, etc., and the embodiments of the present application do not limit this. [[ID=⑨]]

[0028] The scroll casing 2 is located inside the housing 1 and is connected to the housing 1. In one possible embodiment, the scroll casing 2 and the housing 1 may be an integrally formed structure, or they may be two structures connected by a suitable connection method. The connection method may be any suitable method. For example, they may be locked and connected by a locking structure, or screwed and connected by bolts. The embodiments of the present application are not limited to this.

[0029] The scroll tongue 3 is located inside the housing 1 and is connected to the housing 1. In one possible embodiment, the scroll tongue 3 and the housing 1 may be an integrally formed structure, or they may be two structures connected by a suitable connection method. The connection method may be any suitable method. For example, they may be locked and connected by a locking structure, or screwed and connected by bolts. The embodiments of the present application are not limited to this.

[0030] An intake passage A and an exhaust passage B are formed between the scroll tongue 3 and the scroll casing 2, and the intake passage A and the exhaust passage B are communicated. In one possible embodiment, the intake passage A and the exhaust passage B are respectively formed between different surfaces of the scroll tongue 3 and different parts of the scroll casing 2.

[0031] The spiral tongue 3 has a recirculation passage 31, the intake port 31a of the recirculation passage 31 is in communication with the exhaust passage B, and the exhaust port 31b of the recirculation passage 31 is in communication with the intake passage A. In this way, gas enters the intake passage A and flows from the intake passage A to the exhaust passage B. After that, some of the gas in the exhaust passage B can enter the intake port 31a of the recirculation passage 31 and flow out from the exhaust port 31b of the recirculation passage 31, meaning that some of the gas in the exhaust passage B can be recirculated into the intake passage A via the recirculation passage 31.

[0032] The through-flow impeller 4 is located within the vortex casing 2, between the intake passage A and the exhaust passage B, and is rotatably connected to the housing 1.

[0033] In this way, when the through-flow impeller 4 rotates, it can draw external gas into the intake passage A and guide the gas in the intake passage A to the exhaust passage B.

[0034] It can also be understood that the direction of rotation of the through-flow impeller 4 is in the direction that guides the gas from the intake passage A to the exhaust passage B.

[0035] Referring to Figures 1, 2, and 5, in a direction parallel to the axis of the through-flow impeller 4, the recirculation passage 31 is located in the central part of the spiral tongue 3, and the length L3 of the recirculation passage 31 is smaller than the total length of the spiral tongue 3.

[0036] In other words, in a direction parallel to the axis of the through-flow impeller 4, the recirculation passage 31 may include a central part and two ends, the recirculation passage 31 may be located in the central part of the spiral tongue 3, and the recirculation passage 31 may not be provided at the two ends of the spiral tongue 3.

[0037] In the embodiments of this application, the length L3 of the return passage 31 in the direction parallel to the axis of the through-flow impeller 4 may be any suitable length and can be set according to actual requirements, and the embodiments of this application are not limited thereto.

[0038] The once-through fan provided by the embodiments of this application has at least the following beneficial effects: The vortex tongue 3 has a recirculation passage 31, and the exhaust port 31b of the recirculation passage 31 is in communication with the intake passage A. Thus, some of the gas in the exhaust passage B can flow through the recirculation passage 31 to the exhaust port 31b, and this gas can play a role in controlling the gas around the once-through impeller 4 in the intake passage A, thereby stabilizing the position of the eccentric vortex generated when the once-through impeller 4 is operating, thereby improving the pressure resistance of the once-through fan, reducing or delaying stall, and thereby avoiding noise generation.

[0039] Furthermore, in a through-flow fan, the gap between both ends of the spiral tongue 3 and the housing 1 is small or zero, so the housing 1 blocks the flow of gas passing through both ends of the spiral tongue 3. As a result, the gas velocity at both ends of the spiral tongue 3 is lower than the gas velocity in the center of the spiral tongue 3, and the gas at both ends of the spiral tongue 3 is prone to stalling. The recirculation effect of the recirculation passage 31 at both ends of the spiral tongue 3 is also not significant. Thus, in the embodiment of this application, the recirculation passage 31 is installed in the center of the spiral tongue 3, and the recirculation passage 31 is not installed at both ends of the spiral tongue 3. Experiments have shown that, compared to a structure in which the recirculation passage 31 is installed at both the center and both ends of the spiral tongue 3, not installing the recirculation passage 31 at both ends of the spiral tongue 3 does not have a significant or no effect on the performance of the through-flow fan. As a result, the structure that does not have return passages 31 at both ends of the spiral tongue 3 improves the pressure resistance of the through-flow fan, delays stalling, and at the same time reduces the difficulty and time of processing, thereby improving the processing efficiency of the through-flow fan.

[0040] In one possible embodiment, with reference to Figures 1 and 2, the spiral tongue 3 may further have a guide surface 32, a leeward surface 33, and a leeward surface 34.

[0041] In one possible embodiment, the guide surface 32 may be located between the leeward surface 33 and the windward surface 34, and the leeward surface 33 and the windward surface 34 are connected.

[0042] The through-flow impeller 4 is positioned between the guide surface 32 and the vortex casing 2. In this way, when the through-flow impeller 4 rotates, it can flow the gas along the passage formed between the vortex casing 2 and the guide surface 32, thereby allowing the gas to flow smoothly from the intake passage A to the exhaust passage B.

[0043] An intake passage A is formed between the downwind surface 33 and the spiral casing 2, and an exhaust passage B is formed between the upwind surface 34 and the spiral casing 2. The intake port 31a of the recirculation passage 31 is located on the upwind surface 34, and the exhaust port 31b of the recirculation passage 31 is located on the downwind surface 33.

[0044] In this way, as the through-flow impeller 4 rotates, the external gas enters the intake passage A formed between the leeward surface 33 and the volute casing 2 by its action, then enters the passage formed between the volute casing 2 and the guide surface 32 via the intake passage A, and further flows through the passage to the exhaust passage B formed between the leeward surface 34 and the volute casing 2. In this process, the passages formed between the three surfaces, the leeward surface 33, the guide surface 32, and the leeward surface 34, and the volute casing are used to guide the gas, thereby improving the stability of the gas flow within the through-flow fan.

[0045] In the embodiments of this application, the guide surface 32 may be an arcuate surface, a flat surface, or a joint surface between an arcuate surface and a flat surface.

[0046] In one possible embodiment, the guide surface 32 can be set on an arcuate surface, and furthermore, the guide surface 32 may be an arcuate surface that projects axially away from the through-flow impeller 4. In this way, the gap between the guide surface 32 and the outer circumference of the through-flow impeller 4 is located within a narrow gap range, while at the same time improving the gas guiding effect of the spiral tongue 3, thereby improving the overall performance of the through-flow fan.

[0047] In the embodiment of this application, the windward surface 34 may be an arcuate surface, a flat surface, or the like.

[0048] In one possible implementation, the windward surface 34 can be positioned on a flat surface, thereby improving the stability of the gas flow in the exhaust passage B formed between the windward surface 34 and the vortex casing 2.

[0049] Similarly, the downwind surface 33 may be an arcuate surface, a flat surface, or the like.

[0050] In one possible embodiment, the leeward surface 33 can be positioned on a flat surface, thereby improving the stability of the gas flow in the intake passage A formed between the leeward surface 33 and the vortex casing 2.

[0051] In one possible embodiment, exhaust passages B can be formed both between the windward surface 34 and the spiral casing 2, and between the windward surface 34 and the housing 1.

[0052] In one possible embodiment, an intake passage A can be formed jointly between the leeward surface 33 and the spiral casing 2, and between the leeward surface 33 and the housing 1.

[0053] In one possible embodiment, with reference to Figures 1, 2, and 3, the guide surface 32 has a leading edge region 321 and a trailing edge region 322, where the leading edge region 321 of the guide surface 32 is connected to the windward surface 34 and the trailing edge region 322 of the guide surface 32 is connected to the leeward surface 33.

[0054] Furthermore, the leading edge region 321 and the trailing edge region 322 can be positioned on an arc-shaped surface. In this way, the leading edge region 321 can make the transition between the guide surface 32 and the windward surface 34 smoother, and the trailing edge region 322 can make the transition between the guide surface 32 and the leeward surface 33 smoother, thereby improving the stability of the gas flow.

[0055] In one possible embodiment, both the arc surface of the leading edge region 321 and the arc surface of the trailing edge region 322 may be rounded arc surfaces, that is, the portion of the leading edge region 321 connected to the windward surface 34 is in contact with the windward surface 34, and the portion of the trailing edge region 322 connected to the leeward surface 33 is in contact with the leeward surface 33, thus further improving the stability of the gas flow.

[0056] In one possible embodiment, referring to Figure 4, the shortest distance H1 between the leading edge region 321 and the circumference of the outer diameter of the through-flow impeller 4 is a*D, the shortest distance H2 between the trailing edge region 322 and the circumference of the outer diameter of the through-flow impeller 4 is b*D, the radius R1 of the leading edge region 321 is equal to c*D, where a, b, and c are all positive numbers and D is the outer diameter of the through-flow impeller 4.

[0057] In one possible embodiment, the range of the value of a may be 0.05 to 0.07, the range of the value of b may be 0.03 to 0.05, and the range of the value of c may be 0.05 to 0.07, with the units of a, b, and c all being millimeters. For example, a may be 0.06 millimeters, b may be 0.04 millimeters, and c may be 0.06 millimeters.

[0058] Experiments have shown that the airflow of the through-flow fan is relatively stable within the range of the aforementioned values, which helps to stabilize the position of the eccentric vortices generated during the operation of the through-flow impeller 4. This allows the through-flow fan to exhibit good pressure resistance even when the system resistance is high (for example, when the intake passage A or exhaust passage B is blocked), reducing the possibility of airflow stall and avoiding noise generation.

[0059] In one possible embodiment, as shown in Figure 4, the shortest distance H3 between the intake port 31a and the leading edge region 321 of the recirculation passage 31 is e*D, and the shortest distance H4 between the exhaust port 31b and the trailing edge region 322 of the recirculation passage 31 is f*D, where e and f are both positive numbers and D is the outer diameter of the through-flow impeller 4.

[0060] In one possible embodiment, the range of the value of e is 0.15 to 0.3, the range of the value of f is 0.1 to 0.15, and the units of both e and f are millimeters.

[0061] In one possible embodiment, as shown in Figure 4, the range of the passage width value of the return passage 31 may be 1 to 3, and the unit is millimeters.

[0062] In one possible embodiment, referring to Figure 1, the range of the angle θ between the intake direction of the recirculation passage 31 and the portion of the windward surface 34 near the leading edge region 321 is 45 to 90 degrees.

[0063] Experiments have demonstrated that within the range of the aforementioned values, the reflux passage 31 has an excellent effect in stabilizing the eccentric vortices generated by it.

[0064] Any two of the ranges for the values ​​of e and f, the range for the passage width, the range for the included angle θ, and the ranges for the values ​​of a, b, and c can be applied in combination, and experiments have shown that this further improves the stability of the gas flow.

[0065] In embodiments of this application, the shape of the recirculation passage 31 in a cross section perpendicular to the axial direction of the through-flow impeller 4 may be any suitable shape. For example, the cross-sectional shape of the recirculation passage 31 shown in Figure 1 is a multi-folded arc. Of course, the recirculation passage 31 may be any other suitable linear shape, and is not limited thereto in embodiments of this application.

[0066] In one possible embodiment, the spiral tongue 3 may have a further number of support plates, which are located within the recirculation passage 31 and uniformly arranged along an axial direction parallel to the through-impeller 4, thereby supporting the recirculation passage 31 and improving the strength of the spiral tongue 3.

[0067] In one possible embodiment, the spiral tongue 3 can be made further hollow, thereby reducing the weight of the spiral tongue 3 and improving ease of installation.

[0068] In the embodiments of this application, the reflux passage 31 may further have the following structure.

[0069] The circumference of the outer diameter of the through-flow impeller 4 is tangent to the exhaust direction of the exhaust port 31b of the recirculation passage 31. For example, referring to the dashed line in Figure 1, it can be seen that the dashed line indicates the exhaust direction of the exhaust port 31b and is tangent to the circumference of the outer diameter of the through-flow impeller 4 in the intake passage A.

[0070] In this way, some of the gas in the exhaust passage B can flow to the exhaust port 31b via the recirculation passage 31, and this gas can play a certain role in controlling the gas around the through-flow impeller 4 in the intake passage A, thereby stabilizing the position of the eccentric vortex generated during the operation of the through-flow impeller 4 (Figure 1 shows the position of the eccentric vortex as an example), improving the pressure resistance of the through-flow fan, reducing or delaying stall, and avoiding noise generation.

[0071] Furthermore, the once-through fan provided in the embodiment of this application may be any combination of the structures described above and below, and when the exhaust port 31b of the recirculation passage 31 is installed on the downwind side 33 and the circumference of the outer diameter of the once-through impeller 4 is in contact with the exhaust direction of the exhaust port 31b of the recirculation passage 31, on the one hand, the gas flowing out from the exhaust port 31b of the recirculation passage 31 does not flow directly to the once-through impeller 4, and therefore does not impose a large airflow shock on the once-through impeller 4, thereby improving the stability of the gas flow.

[0072] On the other hand, the gas entering the through-flow impeller 4 can be controlled, thereby further improving the stability of the eccentric vortex position, strengthening the pressure resistance of the through-flow fan even when system resistance is high, delaying stall, and avoiding noise generation.

[0073] Furthermore, experiments have shown that when the values ​​a, b, c, e, f, the passage width of the recirculation passage 31, and the angle θ described above are within the corresponding ranges, and the exhaust port 31b of the recirculation passage 31 is located on the downwind side 33, and the circumference of the outer diameter of the through-flow impeller 4 is in contact with the exhaust direction of the exhaust port 31b of the recirculation passage 31, the control of the overall gas flow in the through-flow fan can be further enhanced, improving the overall gas stability and uniformity of the through-flow fan, thereby reducing noise and improving the overall performance of the through-flow fan.

[0074] In one possible embodiment, the length L3 of the recirculation passage 31 in a direction parallel to the axis of the through-flow impeller 4 is m times the total length of the spiral tongue 3, where the value of m is in the range of 0.5 to 0.95. Experiments have shown that when m takes a value between 0.5 and 0.95, the recirculation effect of the recirculation passage 31 is improved, which has a high effect in improving the overall gas stability and uniformity of the through-flow fan and thereby improving the overall performance of the through-flow fan.

[0075] In the embodiments of this application, the spiral tongue 3 can be further configured as follows.

[0076] Referring to Figures 2, 3, and 5, based on any of the above-mentioned through-flow fans, the surface of the spiral tongue 3 may have a plurality of flow guide teeth 35, which are arranged along a direction parallel to the axis of the through-flow impeller 4, and the direction of extension of the flow guide teeth 35 is from the intake passage A to the exhaust passage B.

[0077] Here, the structure of the flow guide teeth 35 may be any suitable structure, and in one possible embodiment, the surface of the spiral tongue 3 has a plurality of grooves, these grooves are arranged along a direction parallel to the axis of the through-flow impeller 4, and the extension direction of each groove is from the intake passage A to the exhaust passage B, and the portion between adjacent grooves can be considered as the flow guide teeth 35.

[0078] Thus, in the process of gas flowing from intake passage A to exhaust passage B, the flow guide teeth 35 can further guide the gas, allowing for better control of the gas flow direction, thereby stabilizing the gas, concentrating the flow, reducing flow separation, and lowering noise.

[0079] In one possible embodiment, the shape of the flow guide teeth 35 may be any suitable shape, for example, the cross-section of the flow guide teeth 35 may be rectangular (Figure 3 illustrates a rectangular flow guide tooth 35), V-shaped, corrugated, etc., and the embodiments of this application are not limited thereto.

[0080] In one possible embodiment, the dimensions of the flow guide teeth 35 may be any suitable dimensions. For example, if the cross-section of the flow guide teeth 35 is rectangular, the tooth depth of the flow guide teeth 35 may be 1 to 3 millimeters, the tooth width of the flow guide teeth 35 may be 1 to 3 millimeters, and the tooth pitch of the flow guide teeth 35 may be 1 to 3 millimeters. Of course, the tooth depth, tooth width, and tooth pitch of the flow guide teeth 35 may be other dimensions and can be set as needed, and are not limited to these in the embodiments of this application.

[0081] In one possible embodiment, the flow guide teeth 35 may be distributed at both ends of the spiral tongue 3. If necessary, the flow guide teeth 35 may be provided only at both ends of the spiral tongue 3, where both ends of the spiral tongue 3 are the ends of the spiral tongue 3 in a direction parallel to the axis of the through-flow impeller 4.

[0082] In related technologies, while the gas flow in the central part of the through-fan is relatively stable in a direction parallel to the axis of the through-impeller 4, at both ends of the through-fan, the housing 1 is close to the ends of the volute casing 2 and the ends of the volute tongue 3, resulting in significant separation of the gas flow at both ends of the through-fan. This makes gas stall extremely likely, thereby reducing the stability of the gas flow in the through-fan.

[0083] In the embodiment of this application, a plurality of flow guide teeth 35 are installed at both ends of the spiral tongue 3, and the flow guide teeth 35 further guide the gas at both ends of the spiral tongue 3 and control the gas flow to some extent, thereby reducing the separation of the gas flow at both ends of the spiral tongue 3 and improving the gas flow control effect at both ends of the through-flow fan. At the same time, it is also possible to improve the gas flow control effect at both ends of the return passage 31, thereby improving the overall stability and uniformity of the gas flow and reducing noise from the through-flow fan.

[0084] Thus, based on the control of gas backflow in the central part of the spiral tongue 3 by the recirculation passage 31, the guide teeth 35 guide gas at both ends of the spiral tongue 3, and by combining and applying both, the stability and uniformity of the gas flow are further improved. Furthermore, the guide teeth 35 installed at both ends of the spiral tongue 3 can further improve the recirculation effect of the recirculation passage 31 that is closer to the guide teeth 35, further improving the flow control effect of the recirculation passage 31, thereby improving the stability and uniformity of the gas flow.

[0085] Furthermore, multiple flow guide teeth 35 can be uniformly distributed at both ends of the spiral tongue 3, thereby making the gas flow at both ends of the spiral tongue 3 more stable and regular, and further reducing the separation of the gas flow at both ends of the spiral tongue 3, thereby improving the overall stability and uniformity of the gas flow and reducing noise.

[0086] Referring to Figure 5, the following further configuration can be made to further improve the overall stability of the gas flow: In a direction parallel to the axis of the through-flow impeller 4, the length (L1 + L2) of the multiple flow guide teeth 35 is n times the total length of the spiral tongue 3, where the range of n is [0.05, 1].

[0087] Experiments demonstrate that when n is between [0.05 and 1], the guide teeth 35 are effective in improving the stability and uniformity of the gas in the once-through fan, and when n is between [0.05 and 1] and m is between [0.5 and 0.95], the overall stability and uniformity of the gas in the once-through fan can be effectively improved.

[0088] For example, the length L1 of the multiple flow guide teeth 35 installed at one end of the spiral tongue 3 may be 0.15 times the total length of the spiral tongue 3, the length L2 of the multiple flow guide teeth 35 installed at the other end of the spiral tongue 3 may similarly be 0.15 times the total length of the spiral tongue 3, and the length L3 of the return passage 31 may be 0.7 times the total length of the spiral tongue 3. By setting the position and length of the return passage 31 and the multiple flow guide teeth 35 in this way, the overall stability of the gas flow is further improved and noise is further reduced.

[0089] In the embodiments of this application, the length of the return passage 31 and the length of the guide teeth 35 at both ends of the spiral tongue 3 may be set so as not to overlap, as in the above example, or they may be set so as to have overlapping portions, and are not limited to these in the embodiments of this application.

[0090] In one possible embodiment, if the spiral tongue 3 has a guide surface 32, a leeward surface 33, and an upwind surface 34, flow guide teeth 35 can be installed on the guide surface 32, the leeward surface 33, and the upwind surface 34, and in the extension direction of the flow guide teeth 35, both ends of the flow guide teeth 35 may be located on the leeward surface 33 and the upwind surface 34, respectively, and the embodiments of this application do not limit the extension length of the flow guide teeth 35 and the specific position of the flow guide teeth 35 in the extension direction.

[0091] To make it easier to understand, when the return passage 31 and the guide teeth 35 overlap, they do not structurally interfere with each other.

[0092] In one possible embodiment, referring to Figure 1, the once-through fan may further include a heat exchanger 5, which is located between the exhaust passage B and the outlet of the housing 1, and the gas flowing out from the exhaust passage B enters the heat exchanger 5 to undergo heat exchange, and then flows out from the heat exchanger 5 to the outlet of the housing 1, and then flows out from the outlet of the housing 1, thereby achieving heat exchange of the gas.

[0093] In one possible embodiment, the once-through fan may further include a drain pan, which is located below the heat exchanger 5 and is used to collect the liquid produced when the gas exchanges heat within the heat exchanger 5.

[0094] In one possible embodiment, the through-flow fan may further include a motor, the output shaft of which is connected to the through-flow impeller 4, and the operation of the motor can drive the rotation of the through-flow impeller 4, thereby enabling the guidance of gas.

[0095] The once-through fan provided in the embodiments of this application may be any combination of the above-mentioned structures, and is not limited thereto in the embodiments of this application.

[0096] Embodiments of this application further provide an air conditioner which includes any of the above-mentioned through-fans.

[0097] In the once-through fan provided by the embodiment of this application, an intake passage A and an exhaust passage B are formed between a volute casing 2 and a volute tongue 3, the volute tongue 3 has a recirculation passage 31 and a plurality of flow guide teeth 35, the exhaust port 31b of the recirculation passage 31 is in communication with the intake passage A, and the once-through impeller 4 is located inside the volute casing 2 and between the intake passage A and the exhaust passage B.

[0098] In this way, some of the gas in the exhaust passage B can flow to the exhaust port 31b via the recirculation passage 31, and this gas can control the gas around the through-flow impeller 4 in the intake passage A, thereby stabilizing the position of the eccentric vortices generated during the operation of the through-flow impeller 4, improving the pressure resistance of the through-flow fan, reducing or delaying stall, and thereby avoiding noise generation.

[0099] Furthermore, in the embodiment of this application, the recirculation passage 31 is installed in the central part of the spiral tongue 3, and the recirculation passage 31 is not installed at both ends of the spiral tongue 3. Experiments have shown that, compared to a structure in which the recirculation passage 31 is installed in both the central part and both ends of the spiral tongue 3, not installing the recirculation passage 31 at both ends of the spiral tongue 3 has no significant or no effect on the performance of the once-through fan. Thus, a structure in which the recirculation passage 31 is not installed at both ends of the spiral tongue 3 can improve the pressure resistance of the once-through fan and delay stalling, while simultaneously reducing the difficulty and time of processing and improving the processing efficiency of the once-through fan.

[0100] The above are merely selectable embodiments of this application, and the scope of protection of this application is not limited thereto. A person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the art disclosed in this application, and all such modifications or substitutions should fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the claims.

Claims

1. A once-through fan comprising a housing (1), a spiral casing (2), a spiral tongue (3), and a once-through impeller (4), The spiral casing (2) and the spiral tongue (3) are both connected to the housing (1), and an intake passage (A) and an exhaust passage (B) are formed between the spiral casing (2) and the spiral tongue (3). The spiral tongue (3) has a recirculation passage (31), the intake port (31a) of the recirculation passage (31) is connected to the exhaust passage (B), and the exhaust port (31b) of the recirculation passage (31) is connected to the intake passage (A). The through-flow impeller (4) is located within the vortex casing (2), positioned between the intake passage (A) and the exhaust passage (B), and rotatably connected to the housing (1). A once-through fan, wherein the return passage (31) is located in the central part of the spiral tongue (3) in a direction parallel to the axis of the once-through impeller (4), and the length of the return passage (31) is shorter than the total length of the spiral tongue (3).

2. The spiral tongue (3) has a guide surface (32), a leeward surface (33), and a leeward surface (34). The through-flow impeller (4) is located between the guide surface (32) and the spiral casing (2). The intake passage (A) is formed between the leeward surface (33) and the spiral casing (2), The exhaust passage (B) is formed between the windward surface (34) and the spiral casing (2), The once-through fan according to claim 1, characterized in that the intake port (31a) is located on the windward side (34) and the exhaust port (31b) is located on the windward side (33).

3. The flow-through fan according to claim 2, characterized in that the leading edge region (321) of the guide surface (32) is connected to the windward surface (34), and the trailing edge region (322) of the guide surface (32) is connected to the leeward surface (33), wherein the leading edge region (321) and the trailing edge region (322) are arc-shaped surfaces.

4. The flow-through fan according to claim 3, characterized in that the shortest distance between the leading edge region (321) and the circumference of the outer diameter of the flow-through impeller (4) is a*D, the shortest distance between the trailing edge region (322) and the circumference of the outer diameter of the flow-through impeller (4) is b*D, the radius of the leading edge region (321) is c*D, where the range of the value of a is [0.05, 0.07], the range of the value of b is [0.03, 0.05], the range of the value of c is [0.05, 0.07], and D is the outer diameter of the flow-through impeller (4).

5. The flow-through fan according to claim 3, characterized in that the shortest distance between the intake port (31a) and the leading edge region (321) is e*D, and the shortest distance between the exhaust port (31b) and the trailing edge region (322) is f*D, where the range of the value of e is [0.15, 0.3], the range of the value of f is [0.1, 0.15], and D is the outer diameter of the flow-through impeller (4).

6. The once-through fan according to claim 5, characterized in that the range of values ​​for the angle θ between the intake direction of the intake port (31a) and the portion of the windward surface (34) near the leading edge region (321) is [45 degrees, 90 degrees].

7. The once-through fan according to claim 1, characterized in that the circumference of the outer diameter of the once-through impeller (4) is in contact with the exhaust direction of the exhaust port (31b).

8. The once-through fan according to claim 7, characterized in that, in a direction parallel to the axis of the once-through impeller (4), the length of the return passage (31) is m times the total length of the spiral tongue (3), where the range of the value of m is [0.5, 0.95].

9. The once-through fan according to claim 1, characterized in that a plurality of flow guide teeth (35) are further provided on the surface of the spiral tongue (3), the plurality of flow guide teeth (35) are arranged in a direction parallel to the axis of the once-through impeller (4), and the direction of extension of the flow guide teeth (35) is in the direction of extension from the intake passage (A) to the exhaust passage (B).

10. The flow-through fan according to claim 9, characterized in that the plurality of flow-guiding teeth (35) are distributed at both ends of the spiral tongue (3).

11. The once-through fan according to claim 10, characterized in that, in a direction parallel to the axis of the once-through impeller (4), the length of the plurality of flow guide teeth (35) is n times the total length of the spiral tongue (3), where the range of the value of n is [0.05, 1].

12. An air conditioner characterized by including a through-flow fan as described in any one of claims 1 to 11.

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