Volute and air duct facilitating drainage
By designing the logarithmic spiral curved volute shell and water guide plate structure, the problem of defrost water in the horizontal air-cooled display cabinet is solved, and the unobstructed air duct and the protection of the foam layer is achieved.
Patent Information
- Application Number
- CN202420630405.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the horizontal air-cooled display cabinet, defrost water is difficult to discharge, resulting in accumulation of icy in the air duct, blocking the air duct, affecting the aerodynamic performance.
Design a logarithmic spiral curved volute. The tangent at the starting point of the volute forms an angle greater than 0° with the lower line of the air duct, forming a turning point higher than the bottom of the volute, and installing a water guide plate at the bottom of the volute. The water guide plate extends out of the volute shell and fan cover plate, and connects the water connection tray to lead out the defrosting water.
Effectively prevent defrost water from flowing along the volute to the air outlet, avoiding icy accumulation in the air duct, ensuring smooth air flow, extending the service life of the air duct, and preventing defrost water from flowing into the foaming layer.
Smart Images
Figure CN222502175U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of refrigeration equipment manufacturing, in particular to a volute and an air duct which are conducive to drainage. Background Art
[0002] In recent years, with the increasing requirements of users such as shopping malls and supermarkets for frost-free and uniform temperature of refrigerators, the research and development of large-volume commercial horizontal air-cooled display cabinets has received more and more attention. In the research and development of horizontal air-cooled display cabinets, the mature design scheme of air-cooled refrigerators has been used for reference, that is, the design scheme of fin evaporator + fan and its volute and air duct is adopted. Air-cooled refrigeration products have the advantages of frost-free and uniform temperature in the box, but after running for a period of time, the evaporator fins, fan, volute, etc. will frost, and the frost density and thickness will increase with time, which will reduce the ventilation volume and heat exchange efficiency. Therefore, after running for a period of time, the evaporator and fan are usually shut down and electric heating or hot air bypass is designed to defrost the evaporator, fan, etc.
[0003] However, since most air-cooled refrigerators are vertical structures, the evaporation fan of air-cooled refrigerators is on the top of the evaporator. During defrosting, the defrosting water can flow to the water receiving box outside the box through the water receiving tray and the defrosting pipe under the action of its own gravity; Figure 1 In the horizontal air-cooled display cabinet shown in FIG. 1 , the fan and its air duct are on the side wall of the display cabinet, and the fan is generally installed higher than the air duct. In the traditional design, in order to ensure smooth air flow and reduce the pressure loss in the air duct, the air flow is usually made to flow out along the tangent of the volute, such as Figure 2 and Figure 3 As shown, it is easy to know that under this design, the defrost water will flow along the volute to the air outlet, and the defrost water in the air duct is difficult to discharge. Under the action of the low temperature in the box, it slowly accumulates and freezes. As time goes by, it will block the air duct, affect the aerodynamic performance, and even destroy the air duct. Utility Model Content
[0004] The utility model aims to provide a volute and an air duct that are conducive to drainage. On the basis of not changing the structure of the original horizontal air-cooled display cabinet, the utility model can prevent the defrost water from flowing along the volute to the air outlet, thereby causing the defrost water in the air duct to be difficult to discharge, and slowly accumulating and freezing under the action of the low temperature in the cabinet, thereby blocking the air duct; the utility model can also prevent the defrost water from flowing along the inner tank wall into the foaming layer, thereby damaging the foaming layer.
[0005] The utility model includes a centrifugal fan communicated with an evaporator chamber, a fan cover is provided on one side of the evaporator chamber outside the centrifugal fan, an air inlet is provided on the fan cover, a volute that wraps the centrifugal fan is provided on the opposite side of the fan cover, the outer shape of the volute is a logarithmic spiral curve shape, the volute extends forward and is provided with an air outlet, and the air outlet is connected to an air duct; the starting point of the logarithmic spiral curve of the volute is located on the right side of the center of the centrifugal fan, and the tangent at the starting point of the logarithmic spiral curve forms an angle greater than 0° with the lower edge line of the air duct, so that an inflection point higher than the bottom of the volute is formed at the connection between the volute and the lower edge line of the air duct; a water guide plate is installed at the bottom of the volute, and the water guide plate extends out of the volute and the fan cover and is suspended on a water receiving tray; and an electric heating belt is also included, and the electric heating belt is arranged on the volute.
[0006] Preferably, a fixing groove is provided on the inner side of the bottom of the volute, and the water guide plate is installed in the fixing groove.
[0007] Preferably, the fixing groove is arc-shaped, and the curvature of the lower surface thereof is consistent with the curvature of the logarithmic spiral curve of the volute at that location.
[0008] Preferably, the water guide plate is arc-shaped, and the curvature of the lower surface of the water guide plate is consistent with the curvature of the upper surface of the fixing groove.
[0009] Preferably, the thickness of the water guide plate is consistent with the depth of the fixing groove.
[0010] Preferably, the depth of the fixing groove is 6 mm.
[0011] Preferably, a gap is left between the bottom of the fan cover and the water guide plate for defrost water to pass through, and the height of the gap is 5 to 8 mm.
[0012] Preferably, the length of the portion of the water guide plate extending outside the volute and the fan cover is greater than 10 mm.
[0013] Preferably, the electric heating belt is evenly wound around the outer surface of the volute and fits the screw curve of the volute.
[0014] Preferably, the volute is of one-piece design.
[0015] In summary, the utility model has the following beneficial effects:
[0016] 1. On the basis of not changing the original structure of the horizontal air-cooled display cabinet, the starting point of the logarithmic spiral curve of the volute is set on the right side of the center of the centrifugal fan, so that the tangent line at the starting point of the logarithmic spiral curve of the volute does not coincide with the extension line of the air duct, and there is a certain angle between the two. An inflection point higher than the bottom of the volute is formed at the connection between the two, which can prevent the defrost water from flowing along the volute to the air outlet, thereby making it difficult to discharge the defrost water in the air duct, and slowly accumulating and icing under the action of the low temperature in the box, thereby blocking the air duct. The defrost water can be discharged in time, and it can also prevent the defrost water from flowing into the foaming layer along the inner wall of the liner and causing damage to the foaming layer;
[0017] 2. A fixed groove is left at the bottom of the volute, and a water guide plate is installed in the fixed groove. The water guide plate extends out of the volute and the fan cover and is connected to the water receiving tray, so that the defrost water can be easily guided to the water receiving tray and then flow to the external water receiving box. The structure is simple and the manufacturability is strong;
[0018] 3. Add an electric heating belt to the outside of the volute to heat and defrost the volute and centrifugal fan, so that the frost on the volute and centrifugal fan can be completely melted, avoiding the formation of ice on the volute or impeller due to incomplete defrosting, affecting the rotation efficiency of the fan or even blocking the rotation of the fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of the horizontal air-cooled display cabinet described in the background technology;
[0020] Figure 2 It is a schematic diagram of the volute and air duct structure of the currently used horizontal air-cooled display cabinet described in the background technology;
[0021] Figure 3 for Figure 2 Simplified line diagram of the connection between the middle volute and the air duct;
[0022] Figure 4 This is a schematic diagram of the structure of a volute and an air duct that is beneficial to drainage in the utility model;
[0023] Figure 5 for Figure 4 The structural diagram without the fan cover;
[0024] Figure 6 for Figure 5 A partial enlarged view of
[0025] Figure 7 for Figure 6 Stereoscopic image of
[0026] Figure 8 for Figure 7 The schematic diagram of the structure without the water guide plate;
[0027] Fig. 9A simplified line diagram of the connection between the volute and the air duct;
[0028] Fig.10 This is a schematic diagram of the structure of the other side of the volute. DETAILED DESCRIPTION
[0029] The utility model will be further described below in conjunction with the accompanying drawings.
[0030] The orientations mentioned in this specification are based on the orientations of the volute and the air duct of the utility model that are conducive to drainage when working normally, and do not limit the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships.
[0031] like Figures 4 to 10 As shown together, a volute and air duct that are conducive to drainage include a centrifugal fan 2 that is communicated with an evaporator chamber 1, the centrifugal fan 2 provides power for the internal air flow, a fan cover 3 is provided on one side of the evaporator chamber 1 outside the centrifugal fan 2, an air inlet is provided on the fan cover 3, a volute 4 that wraps the centrifugal fan 2 is provided on the opposite side of the fan cover 3, the shape of the volute 4 is a logarithmic spiral curve 9, the volute 4 extends forward and is provided with an air outlet, and the air outlet is connected to the air duct 5; the volute 4 is used to collect the gas coming out of the impeller of the centrifugal fan 2, and guide it to the outlet of the volute 4, and send the gas into the air duct 5; the fan cover 3 and the volute 4 are together enclosed to form a The space between the air inlet and the air outlet, the air inlet is the source of the air flow in the air duct 5, is circular, and is located in the middle of the fan cover 3, playing a role in guiding the air, and the air inlet is coaxially arranged with the fan; the starting point of the logarithmic spiral curve 9 of the volute 4 is located on the right side of the center of the centrifugal fan 2, and the tangent at the starting point of the logarithmic spiral curve 9 forms an angle greater than 0° with the lower edge line of the air duct 5, so that at the connection between the volute 4 and the lower edge line of the air duct 5, an inflection point higher than the bottom of the volute 4 is formed; a water guide plate 6 is installed at the bottom of the volute 4, and the water guide plate 6 extends out of the volute 4 and the fan cover 3 and is suspended on the water receiving tray; it also includes an electric heating belt 7, which is arranged on the volute 4.
[0032] When frost forms on the volute 4 and the centrifugal fan 2, the switch is turned on and the electric heating belt 7 starts to heat up, melting the frost into water. Under the action of gravity, the frost flows to the bottom of the volute 4 and is guided into the water receiving tray through the water guide plate 6. Because the position of the water guide plate 6 is lower than the inflection point of the connection between the volute 4 and the lower edge of the air duct 5, the defrosted water will not enter the air duct 5 and affect the air duct 5.
[0033] Furthermore, a fixed groove 8 is provided on the inner side of the bottom of the volute 4, and the water guide plate 6 is installed in the fixed groove 8. The fixed groove 8 is arc-shaped, and the curvature of its upper surface is consistent with the curvature of the logarithmic spiral curve 9 of the volute 4 at that location; the water guide plate 6 is arc-shaped, and the curvature of the lower surface of the water guide plate 6 is consistent with the curvature of the upper surface of the fixed groove 8, and the thickness of the water guide plate 6 is consistent with the depth of the fixed groove 8; preferably, the depth of the fixed groove 8 is 6 mm, and a gap is left between the bottom of the fan cover 3 and the water guide plate 6 for defrost water to pass through, the height of the gap is 5 to 8 mm, and the length of the part of the water guide plate 6 extending outside the volute 4 and the fan cover 3 is greater than 10 mm.
[0034] Furthermore, the electric heating belt 7 is evenly wound around the outer surface of the volute 4 and fits the logarithmic spiral curve 9 of the volute 4, so that the heating is more uniform and the frost on the volute 4 and the centrifugal fan 2 can be completely melted, thereby avoiding the formation of ice on the volute 4 or the impeller of the centrifugal fan 2 due to incomplete defrosting, affecting the rotation efficiency of the fan or even blocking the rotation of the centrifugal fan 2.
[0035] Furthermore, the volute 4 is an integrally formed design.
[0036] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A volute and air duct that facilitates drainage, characterized in that: The invention comprises a centrifugal fan (2) connected to an evaporator chamber (1); a fan cover (3) is provided on one side of the evaporator chamber (1) outside the centrifugal fan (2); an air inlet is provided on the fan cover (3); a volute (4) wrapping the centrifugal fan (2) is provided on the opposite side of the fan cover (3); the outer shape of the volute (4) is in the shape of a logarithmic spiral curve (9); the volute (4) extends forward and is provided with an air outlet; the air outlet is connected to an air duct (5); the starting point of the logarithmic spiral curve (9) of the volute (4) is located at the On the right side of the center of the centrifugal fan (2), the tangent line at the starting point of the logarithmic spiral curve (9) forms an angle greater than 0° with the lower edge line of the air duct (5), so that an inflection point higher than the bottom of the volute (4) is formed at the connection between the volute (4) and the lower edge line of the air duct (5); a water guide plate (6) is installed at the bottom of the volute (4), and the water guide plate (6) extends out of the volute (4) and the fan cover plate (3) and is suspended on the water receiving tray; and an electric heating belt (7) is also included, and the electric heating belt (7) is arranged on the volute (4).
2. A volute and air duct for facilitating drainage as claimed in claim 1, characterized in that: A fixing groove (8) is provided on the inner side of the bottom of the volute (4), and the water guide plate (6) is installed in the fixing groove (8).
3. A volute and air duct for facilitating drainage as claimed in claim 2, characterized in that: The fixing groove (8) is arc-shaped, and the curvature of its lower surface is consistent with the curvature of the logarithmic spiral curve (9) of the volute (4) at that location.
4. A volute and air duct for facilitating drainage as claimed in claim 3, characterized in that: The water guide plate (6) is arc-shaped, and the curvature of the lower surface of the water guide plate (6) is consistent with the curvature of the upper surface of the fixing groove (8).
5. A volute and air duct for facilitating drainage as claimed in claim 2, characterized in that: The thickness of the water guide plate (6) is consistent with the depth of the fixing groove (8).
6. A volute and air duct for facilitating drainage as claimed in claim 2, characterized in that: The depth of the fixing groove (8) is 6 mm.
7. A volute and air duct for facilitating drainage as claimed in claim 1, characterized in that: A gap is left between the bottom of the fan cover plate (3) and the water guide plate (6) for defrost water to pass through, and the height of the gap is 5 to 8 mm.
8. A volute and air duct for facilitating drainage as claimed in claim 1, characterized in that: The length of the portion of the water guide plate (6) extending outside the volute (4) and the fan cover plate (3) is greater than 10 mm.
9. A volute and air duct for facilitating drainage as claimed in claim 1, characterized in that: The electric heating belt (7) is evenly wound around the outer surface of the volute (4) and fits the screw curve of the volute (4).
10. A volute and air duct for facilitating drainage as claimed in claim 1, characterized in that: The volute (4) is of an integrally formed design.