Volute, fan and gas water heater

Abstract

The utility model belongs to the technical field of gas water heaters, and particularly discloses a volute, a fan and a gas water heater, the volute is provided with molded lines, and the molded lines comprise a first molded line, a second molded line, a third molded line, a fourth molded line and a fifth molded line which are connected in sequence; the fourth molded line forms a spiral main body of the volute, the first molded line and the fifth molded line form an outlet of the volute, the second molded line forms a volute tongue of the volute, the third molded line is smoothly connected with the second molded line and the fourth molded line, and based on a base point forming the fourth molded line, the distance between a connecting point of the fourth molded line and the third molded line and the base point is R1, the distance between the connection point of the fourth molded line and the fifth molded line and the base point is R2, the radius of any point located on the fourth molded line is r, and r = 4 * (R2-R1) * theta < 2 > / 9pi < 2 > + R1; the fan comprises an impeller and the volute, so that the efficiency of the fan can be improved; the gas water heater adopts the fan, so that the efficiency of the gas water heater is improved by improving the efficiency of the fan.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas water heater technical field especially relates to a volute, fan and gas water heater. BACKGROUND

[0002] The forced air type gas water heater makes air enter the combustion chamber through the fan. The fan has two important indexes of air volume and static pressure. The fan static pressure refers to the potential energy of unit volume gas flowing in the fan, which relates to whether the water heater can effectively overcome the pipeline resistance and ensure that the combustion chamber obtains sufficient air supply. The air volume refers to the volume of gas that the fan can deliver in unit time, which will affect the combustion efficiency and hot water supply capacity. The air volume and the static pressure are inversely proportional. The shape of the fan volute will affect the air volume and the static pressure of the fan. Since the volute profile is generated by different circular arcs with different centers, in the prior art, the radii of the adjacent circular arcs change greatly, which will cause vortex in the volute, and the air volume, air pressure and efficiency of the fan will be greatly reduced. SUMMARY

[0003] The utility model solves the technical problem to provide a volute, fan and gas water heater, which can effectively improve the air volume and air pressure of the volute, and improve the overall efficiency of the fan.

[0004] The above technical problem is solved by the following technical scheme:

[0005] A volute, characterized in that: the volute has a profile line, the profile line includes a first profile line, a second profile line, a third profile line and a fourth profile line connected in turn; the third profile line constitutes the spiral main body of the volute, the first profile line and the fourth profile line constitute the outlet of the volute, and the second profile line constitutes the volute tongue of the volute. Based on the base point of forming the third profile line, the distance between the connection point of the third profile line and the second profile line and the base point is R1, and the distance between the connection point of the third profile line and the fourth profile line and the base point is R2; the radius of any point on the fourth profile line is r, r=4*(R2-R1)*θ 2 / 9π 2 +R1; wherein, taking the base point as the center, the connection point of the fourth profile line and the third profile line is M, and any point X on the process curve of the fourth profile line, θ=∠MOX, 0≤θ≤3π / 2.

[0006] The volute has the beneficial effects that, compared with the prior art, the fourth type line is a one-variable quadratic equation of polar coordinates, the change of the polar radius of the fourth type line is continuous, the spiral is increasing, that is, the cross-sectional area of the volute is increasing spirally, the kinetic energy of the fluid can be converted into pressure potential energy, the pressurization effect is good, the transition is smooth, the friction coefficient can be significantly reduced, the energy loss can be reduced, the air volume can be improved, and the air outlet efficiency of the volute can be improved.

[0007] In some embodiments, R1 / R2 = 1.25-1.45.

[0008] In some embodiments, the second type line and the third type line are both arc lines, and the centers of the second type line and the third type line are located on two sides of the fourth type line.

[0009] In some embodiments, the center of the third type line is located on a line connecting an end point of the fourth type line away from the fifth type line and the base point, the radius of the third type line is R3, and R2-B≤R3≤R1; wherein B is a distance between an end point of the first type line away from the second type line and an end point of the fifth type line away from the fourth type line.

[0010] In some embodiments, the fifth type line is tangent to the fourth type line, and the first type line is parallel to the fifth type line.

[0011] In some embodiments, the line spacing between the first type line and the fifth type line is B, and B = 0.95R1-1.15R1.

[0012] In some embodiments, the radius R4 of the second type line is 0.06R1-0.15R1.

[0013] In some embodiments, the length of the fifth type line is H, and H = 1.25R1-1.45R1.

[0014] Also provided is a fan, which comprises a volute and a fan as described above.

[0015] Also provided is a gas water heater, which comprises a fan as described above. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a schematic diagram of the volute type line in the utility model;

[0017] Fig. 2 It is a noise comparison diagram of the radius R4 of the second type line being 0.06R1 and 0.15R1 in the utility model.

[0018] LABEL EXPLANATION:

[0019] 1, first wire; 2, second wire; 3, third wire; 4, fourth wire; 5, fifth wire;

[0020] 6, outlet; O, base point. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] The terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] As Figs. 1-2As shown, this application provides a volute with profiles. The profile of the volute is a prior art term referring to the motion boundary of the fluid inside the volute. It determines the shape of the volute and the flow characteristics of the internal fluid, playing a crucial role in the design of the volute. Details are omitted here. In this application, the profile of the volute includes a first profile 1, a second profile 2, a third profile 3, a fourth profile 4, and a fifth profile 5 connected sequentially. The fourth profile 4 constitutes the helical body of the volute. The first profile 1 and the fifth profile 5 constitute the outlet 6 of the volute. The second profile 2 constitutes the volute tongue. The third profile 3 smoothly connects the second profile 2 and the fourth profile 4. Based on the base point O forming the fourth profile 4, the distance from the connection point of the fourth profile 4 and the third profile 3 to the base point O is R1, and the distance from the connection point of the fourth profile 4 and the fifth profile 5 to the base point O is R2. The radius of any point on the fourth profile 4 is r, where r = 4*(R2-R1)*θ. 2 / 9π 2 +R1; where, with base point O as the center, the connection point between the fourth type line 4 and the third type line 3 is M, any point of the fourth type line 4 is X, θ = the angle of ∠MOX, 0≤θ≤3π / 2; π is 180°.

[0026] In other words, in the current embodiment, with base point O as the center, let the connection point M between the fourth type line 4 and the third type line 3 be the reference point, and the connection point N between the fourth type line 4 and the fifth type line 5 be the reference point. Take any point X on the fourth type line 4, and define the angle ∠MOX as θ. When X coincides with M, the minimum value of θ is equal to the angle of ∠MOM, which is 0 degrees. When X coincides with N, the maximum value of θ is the angle of ∠MON, which is 3π / 2. Then, countless points X converge to form the fourth type line 4. Therefore, the process curve r of the fourth type line 4 is a quadratic equation in polar coordinates, specifically r = 4*(R2-R1)*θ² / 9π 2 +R1.

[0027] Based on Bernoulli's equation: p + ρv 2 / 2+ρgh=C, where p is the pressure at a point in the fluid; v is the fluid velocity at that point; ρ is the fluid density; g is the acceleration due to gravity; and h is the height of that point. According to Bernoulli's equation, the kinetic energy, potential energy, and pressure energy of an incompressible fluid can be interconverted. As the cross-section of the volute increases, the velocity decreases, the kinetic energy decreases, and the pressure energy increases while the potential energy remains constant, meaning the static pressure increases. Therefore, the fourth type line 4 is a quadratic equation in polar coordinates, making the change in the polar radius of the fourth type line 4 continuous and spirally increasing, meaning the cross-sectional area inside the volute spirally increases. This allows the fluid's kinetic energy to be converted into pressure energy, resulting in a good pressurization effect and a smooth transition. It can significantly reduce the friction coefficient, reduce energy loss, increase airflow, and improve the volute's air outlet efficiency.

[0028] In the current embodiment, each profile is smoothly transitioned between, which is more conducive to improving fluid performance and reducing noise.

[0029] In some embodiments, R1 / R2 = 1.25-1.45.

[0030] Specifically, the same environment, the same impeller configuration (the same impeller of the existing fan R = 47 mm), the same speed (2565 rpm), the existing fan (using the fourth profile 4 curve not on the polar coordinate monomial quadratic equation, forming a radius discontinuous volute) and the fan using the volute of the present application (referred to as new fan in the table below) (R1 = 52.25 mm; R2 = 1.35 * R1 = 70.54 mm) are compared in terms of air volume and static pressure, as shown in the following figure:

[0031]

[0032] By comparison, the new fan using the volute of the present application compared with the existing fan, the maximum static pressure is increased by 8.4%, and the maximum air volume is increased by 4.0%. The improvement effect is remarkable.

[0033] Secondly, also in the same environment, the same impeller configuration, the same speed (2565 rpm), R1 = 52.25 mm, seven new fans with R2 = 1.15R1, 1.25R1, 1.30R1, 1.35R1, 1.40R1, 1.45R1, 1.55R1 are compared in terms of air volume and static pressure, and R2 = 1.35R1 is taken as the reference type, as shown below:

[0034]

[0035]

[0036] Based on the above comparison data, the performance of the three fans with R2 = 1.30R1, 1.35R1, 1.40R1 is close. The new fan with R2 = 1.25R1 has little difference in air volume compared with the benchmark type. The cross-sectional area of the volute is smaller than that of the benchmark type, and the pressure boosting effect is not ideal, so the maximum static pressure is 7.8% smaller than that of the benchmark type. The new fan with R2 = 1.45R1 has a maximum static pressure 1.3% larger than that of the benchmark type, but the maximum air volume is 11.2% lower than that of the benchmark type. The new fan with R2 = 1.15R1 has a maximum air volume 8.7% lower and a maximum static pressure 19.8% lower than those of the benchmark type due to the narrow flow channel, poor pressure boosting effect of the volute, high flow velocity and large friction loss. The new fan with R2 = 1.55R1 has a maximum air volume 18.5% lower and a maximum static pressure 7.7% lower than those of the benchmark type due to the wide flow channel, disordered internal flow field and poor fan efficiency. In order to improve the air volume and static pressure, the range of the fourth profile 4 is R2 / R1 = 1.25-1.45 considering the characteristics of the air volume and static pressure.

[0037] As shown in FIG. 1, in some embodiments, the second profile 2 forms a volute tongue of the volute, and the volute tongue mainly guides the airflow to the outlet 6. In the current embodiment, the second profile 2 is an arc line, which can ensure smooth guidance and improve efficiency. In order to smoothly connect the second profile 2 and the fourth profile 4, the third profile 3 is also an arc line. The center of the third profile 3 and the center of the second profile 2 are located on the two sides of the fourth profile 4 to achieve smooth connection. Fig. 1 Specifically, the center of the third profile 3 is located on the line connecting the endpoint of the fourth profile 4 away from the fifth profile 5 and the base point O. The radius of the third profile 3 is R3, and R2-B≤R3≤R1. B is the distance between the endpoint of the first profile 1 away from the second profile 2 and the endpoint of the fifth profile 5 away from the fourth profile 4, that is, the size of the end of the outlet 6. Further, the fifth profile 5 is tangent to the fourth profile 4, the first profile 1 is parallel to the fifth profile 5, the line spacing between the first profile 1 and the fifth profile 5 is B, B = 0.95R1-1.15R1, and the length of the fifth profile 5 is H, H = 1.25R1-1.45R1.

[0038] In the current embodiment, after defining the length of the fifth profile 5, the line spacing between the first profile 1 and the fifth profile 5, and the center and radius of the third profile 3, the circle formed by the third profile 3 and the first profile 1 can intersect to form an included angle, and then the included angle is chamfered to form the second profile 2. R2-B≤R3 is required for chamfering. If R3>R1, it belongs to a shallow volute tongue in the volute design, the fluid circulates inside, and the performance loss is large. Therefore, R3≤R1 is adopted in the current embodiment to avoid the above performance loss. Therefore, the range of the radius R3 of the third profile 3 is R2-B≤R3≤R1.

[0039]

[0040] ​Further, the radius R4 of the second type line 2 is 0.06R1-0.15R1; that is, the chamfer radius is 0.06R1-0.15R1, since the chamfer radius is greater than 0.15R1, the curve performance of the third type line 3 is cut off, which is close to the design of the shallow volute tongue, and Fig. 2 In the R1=52.25mm, the radius R4 of the second type line 2 is 0.096*R1=5mm (in the light green) and R4=0.06*R1=3mm (in the purple) in the noise comparison verification, when the chamfer radius R4 is 0.06*R1=3mm, the rotating noise has appeared, and then the chamfer radius R4 of the second type line 2 in the present embodiment is selected as 0.06R1-0.15R1. Fig. 2 In the R1=52.25mm, the radius R4 of the second type line 2 is 0.096*R1=5mm (in the light green) and R4=0.06*R1=3mm (in the purple) in the noise comparison verification, when the chamfer radius R4 is 0.06*R1=3mm, the rotating noise has appeared, and then the chamfer radius R4 of the second type line 2 in the present embodiment is selected as 0.06R1-0.15R1. Fig. 2 In the R1=52.25mm, the radius R4 of the second type line 2 is 0.096*R1=5mm (in the light green) and R4=0.06*R1=3mm (in the purple) in the noise comparison verification, when the chamfer radius R4 is 0.06*R1=3mm, the rotating noise has appeared, and then the chamfer radius R4 of the second type line 2 in the present embodiment is selected as 0.06R1-0.15R1.

[0041] In summary, by using the second type line 2 and the third type line 3 described above, the volute tongue can have a larger turning angle, thereby avoiding the sharp angle structure of the traditional volute tongue, on the one hand, the volute tongue is easy to form and avoid damage during processing, on the other hand, the volute tongue formed by the above-mentioned can improve the noise. That is, without changing the fourth type line 4, without changing the air volume and the air pressure, only changing the second type line 2 and the third type line 3 can improve the noise.

[0042] The application also provides a fan, which comprises an impeller and the volute described above, thereby improving the air volume and static pressure of the fan and improving the overall efficiency of the fan.

[0043] The application also provides a gas water heater, which uses the fan described above, thereby improving the efficiency of the fan and improving the efficiency of the gas water heater.

[0044] In the specific contents of the above specific embodiments, any combination of technical features can be combined, and in order to make the description simple, not all possible combinations of the above technical features are described, but as long as the combination of these technical features does not exist, it should be considered as the scope of the description.

[0045] The specific contents of the above specific embodiments only express several embodiments of the application, which are described in detail, but it should not be understood as a limitation on the scope of the patent of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A volute, characterized in that: The volute has profiles, including a first profile (1), a second profile (2), a third profile (3), a fourth profile (4), and a fifth profile (5) connected in sequence. The fourth profile (4) forms the spiral body of the volute. The first profile (1) and the fifth profile (5) form the outlet (6) of the volute. The second profile (2) forms the volute tongue. The third profile (3) smoothly connects the second profile (2) and the fourth profile (4). Based on the base point (O) forming the fourth profile (4), the distance from the connection point of the fourth profile (4) and the third profile (3) to the base point (O) is R1, and the distance from the connection point of the fourth profile (4) and the fifth profile (5) to the base point (O) is R2. The radius of any point on the fourth profile (4) is r, where r = 4*(R2-R1)*θ. 2 / 9π 2 +R1; where, with the base point (O) as the center, the connection point between the fourth type line (4) and the third type line (3) is M, any point of the fourth type line (4) is X, θ = the angle of ∠MOX, 0≤θ≤3π / 2.

2. The volute according to claim 1, characterized in that, R1 / R2 = 1.25 - 1.

45.

3. The volute according to claim 1, characterized in that, Both the second type line (2) and the third type line (3) are arcs, and the centers of the second type line (2) and the third type line (3) are located on both sides of the fourth type line (4).

4. The volute according to claim 3, characterized in that, The center of the third type line (3) is located on the line connecting the endpoint of the fourth type line (4) away from the fifth type line (5) and the base point (O). The radius of the third type line (3) is R3, and R2-B≤R3≤R1; where B is the distance between the endpoint of the first type line (1) away from the second type line (2) and the endpoint of the fifth type line (5) away from the fourth type line (4).

5. The volute according to claim 4, characterized in that, The fifth type line (5) is tangent to the fourth type line (4), and the first type line (1) is parallel to the fifth type line (5).

6. The volute according to claim 5, characterized in that, The line spacing between the first type line (1) and the fifth type line (5) is B, where B = 0.95R1 - 1.15R1.

7. The volute according to claim 4, characterized in that, The radius R4 of the second type line (2) is 0.06R1-0.15R1.

8. The volute according to claim 1, characterized in that, The length of the fifth type line (5) is H, where H = 1.25R1 - 1.45R1.

9. A fan, characterized in that, It includes an impeller and a volute as described in any one of claims 1-8.

10. A gas-fired water heater, characterized in that, Including the wind turbine as described in claim 9.

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