Gas water heater fan and gas water heater

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses a gas water heater fan and a gas water heater. The gas water heater fan comprises a volute and an impeller arranged in the volute. An air outlet is formed in the arc-shaped side face of the volute and connected with an air outlet barrel. The diameter of the end, close to the volute, of the air outlet barrel is D1. In the axial direction of the volute, the width of the arc-shaped side face of the volute is H1, the width of the impeller is H2, and the relation among H1, H2 and D1 is that H1 / D1 is larger than or equal to 0.95 and smaller than or equal to 1.05, and H2 / D1 is larger than or equal to 0.75 and smaller than or equal to 0.85; the outer diameter of a blade of the impeller is D2, and the relation between D2 and D1 is that D2 / D1 is larger than or equal to 1.84 and smaller than or equal to 1.94. The relation between H1, H2 and D2 and D1 is set according to the parameters, the width of the impeller can be reduced, the outer diameter of blades of the impeller can be increased, the impeller can more efficiently push airflow in the volute into the air outlet barrel through the air outlet, and then the air pressure and air volume output capacity of the gas water heater fan is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot water supply equipment technical field especially relates to a gas water heater fan and gas water heater. BACKGROUND

[0002] Normally, the pipe diameter of the inlet and outlet air port flue of the balanced gas water heater is larger than the exhaust pipe diameter of the fan, which makes the balanced gas water heater need large installation space when installing the inlet and outlet air port flue, and the large size inlet and outlet air port flue also increases the production cost of the balanced gas water heater. SUMMARY

[0003] The first technical problem solved by the utility model is to provide a gas water heater fan, which effectively solves the problem of poor exhaust performance of the gas water heater caused by the reduced pipe diameter of the inlet and outlet air port flue.

[0004] The second technical problem solved by the utility model is to provide a gas water heater, which effectively solves the problem of poor exhaust performance of the gas water heater caused by the reduced pipe diameter of the inlet and outlet air port flue.

[0005] The first technical problem is solved by the following technical scheme:

[0006] A gas water heater fan, comprising a volute and an impeller arranged in the volute; an arc-shaped side surface of the volute is provided with an air outlet, and the air outlet is connected with an air outlet cylinder; the diameter of the air outlet cylinder near one end of the volute is D1; along the axial direction of the volute, the width of the arc-shaped side surface of the volute is H1, and the width of the impeller is H2, and the relationship between H1, H2 and D1 is 0.95≤H1 / D1≤1.05 and 0.75≤H2 / D1≤0.85; the outer diameter of the blade of the impeller is D2, and the relationship between D2 and D1 is 1.84≤D2 / D1≤1.94.

[0007] The gas water heater fan has the beneficial effects that: the utility model discloses a fan and background art compared to, with the beneficial effect is: the utility model discloses through setting H1, H2 and D2 and D1 according to the above parameter relation, can reduce the width of impeller, increase the outer diameter of the blade of impeller, make the impeller more efficiently push the airflow in the volute to the air outlet tube through the air outlet, and further enhance the air pressure and air volume output capacity of the gas water heater fan. Specifically, when the width of the impeller is reduced, it can be adapted to the pipe diameter of the air outlet end of the air outlet tube (i.e. the end of the air outlet tube connected with the inlet and outlet air pipe), in this way, not only can the utilization efficiency of the blade be improved, but also the airflow can pass through the air outlet tube more smoothly, reducing the turbulence phenomenon and reducing energy loss, thereby improving the efficiency and performance of the gas water heater fan, and further, even in the case that the air outlet tube diameter is reduced, the fan can still provide sufficient air volume at the same speed. Secondly, by increasing the outer diameter of the blade of the impeller, the area swept by the impeller at the same speed can be increased, thereby the air intake and exhaust capacity of the gas water heater fan can be improved, and the lost air volume due to the size reduction of the air outlet end of the air outlet tube can be compensated.

[0008] In addition, the utility model makes the relationship of H1 and D1 satisfy 0.95≤H1 / D1≤1.05, can guarantee that the airflow in the volute flows to the air outlet smoothly, avoid appearing vortex phenomenon. Secondly, since a certain gap needs to be left between the impeller and the volute to avoid interference between the impeller and the inner wall of the volute during rotation, further, the utility model makes the relationship of H2 and D1 satisfy 0.75≤H2 / D1≤0.85, not only can prevent the impeller from rubbing against the inner wall of the volute during rotation, but also can make the airflow accelerated by the impeller flow to the air outlet smoothly along the set path on the volute.

[0009] In one of the embodiments, the inner diameter of the blade of the impeller is D3, and the relationship between D3 and D2 is: 0.72≤D3 / D2≤0.82.

[0010] In one of the embodiments, the volute is provided with an air inlet with a diameter of D4 on one side thereof along the axial direction, and the relationship between D4 and D2 is: D4≥(D2+1)mm.

[0011] In one of the embodiments, along the length direction of the volute, the vertical distance from the end of the volute away from the outlet tube to the center point of the impeller is H3, the vertical distance from the center point of the impeller to the end of the volute away from the outlet tube is H4; along the width direction of the volute, the vertical distance from the center axis point of the impeller to the two ends of the volute is H5 and H6 respectively; the relationship between H3, H4, H5, H6 and D2 satisfies: 2.38≤H3 / D2≤2.48, 1.15≤H4 / D2≤1.25, 1.24≤H5 / D2≤1.34, 1.08≤H6 / D2≤1.18.

[0012] In one of the embodiments, the outlet tube comprises a connecting pipe connected with the volute, an exhaust pipe, and a transition pipe connecting the connecting pipe and the exhaust pipe; the diameter D5 of the exhaust pipe is smaller than the diameter D1 of the connecting pipe, and the relationship between D5 and D1 satisfies: 0.66≤D5 / D1≤0.76; from the connecting pipe to the exhaust pipe, the diameter of the connecting pipe decreases.

[0013] In one of the embodiments, the transition pipe and the exhaust pipe form an included angle A at the connection therebetween, and the value range of A is: 142°≤A≤162°.

[0014] In one of the embodiments, the outlet opening is provided with an annular boss surrounding the outlet opening, and at least part of the annular boss extends to the connecting pipe along the axial direction of the outlet tube and is connected with the inner wall of the connecting pipe; along the axial direction of the outlet tube, the length of the connecting pipe connected with the annular boss is B, and the value range of B satisfies: 0.15≤B / D5≤0.25.

[0015] In one of the embodiments, along the axial direction of the outlet tube, the length of the exhaust pipe is C, and the value range of C satisfies: 0.70≤C / D5≤0.80.

[0016] The second technical problem is solved by the following technical scheme:

[0017] A gas water heater comprises:

[0018] A shell is provided with a cavity and an opening communicating with the cavity, and an exhaust pipe is connected at the opening;

[0019] The gas water heater fan described above, the volute is arranged in the cavity, and at least part of the outlet tube extends into the exhaust pipe.

[0020] Compared with the prior art, the gas water heater described in this utility model has the following advantages: Compared with existing gas water heaters, the gas water heater with the aforementioned gas water heater fan can effectively eliminate the negative impact on the exhaust capacity of the gas water heater caused by reducing the diameter of the inlet and outlet flue pipes. In this way, the exhaust performance of the gas water heater is not affected, its installation space requirements are reduced, and the production cost of the gas water heater is also reduced.

[0021] In one embodiment, the exhaust pipe includes an exhaust pipe sleeved outside the exhaust duct and an intake pipe sleeved outside the exhaust pipe, with a first gap between the inner wall of the intake pipe and the outer wall of the exhaust pipe; a second gap is left between the exhaust duct located outside the exhaust pipe and the opening, the second gap being not less than the first gap. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a gas water heater fan according to an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 The axial sectional view of the gas water heater fan shown.

[0025] Figure 3 for Figure 1 The diagram shows a partial structural schematic of a gas water heater fan.

[0026] Figure 4 for Figure 1 The diagram shows the structure of a gas water heater fan from another perspective.

[0027] Figure 5 for Figure 1 The diagram shows the structure of the air outlet duct.

[0028] Figure 6 This is a partial structural diagram of a gas water heater according to an embodiment of the present utility model;

[0029] Figure 7 The above are PQ line graphs corresponding to Embodiment 1, Comparative Example 1, and Comparative Example 2 of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1, volute; 101, air outlet; 1011, annular boss; 102, air inlet; 103, first half shell; 104, second half shell; 1041, connecting plate; 2, impeller; 3, air outlet cylinder; 301, connecting pipe; 302, exhaust pipe; 303, transition pipe; 4, shell; 401, cavity; 402, smoke exhaust pipe; 4021, smoke outlet pipe; 4022, air inlet pipe; 5, first gap; 6, second gap. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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.

[0034] The terms "first", "second" are only 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" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. 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.

[0036] The embodiments of the present application will be described below in conjunction with Figures 1 to 6 , the embodiments of the present application.

[0037] According to the embodiments of the present application, on the one hand, as Figure 1 ,Figure 2 and Figure 5 As shown in the figure, a gas water heater fan is provided, which comprises a volute 1 and an impeller 2 arranged in the volute 1; an air outlet 101 is arranged on the arc-shaped side of the volute 1, and an air outlet pipe 3 is connected to the air outlet 101; the diameter of the air outlet pipe 3 near one end of the volute 1 is D1; along the axial direction of the volute 1, the width of the arc-shaped side of the volute 1 is H1, and the width of the impeller 2 is H2, and the relationship between H1, H2 and D1 is: 0.95≤H1 / D1≤1.05, 0.75≤H2 / D1≤0.85; the outer diameter of the blade of the impeller 2 is D2, and the relationship between D2 and D1 is: 1.84≤D2 / D1≤1.94.

[0038] It should be noted that the reason why the performance of the existing ordinary fan will decrease after the air outlet pipe 3 with a smaller diameter is assembled on the air outlet end is that the width of the impeller 2 will be greater than the pipe diameter of the air outlet end of the air outlet pipe 3 after the pipe diameter of the air outlet end is reduced, so that the airflow in the area far from the air outlet 101 of the impeller 2 cannot continue to flow smoothly to the air outlet pipe 3, and at the same time, local backflow and vortex are formed. In this way, the performance of the fan and the smoke exhaust effect of the gas water heater will be greatly affected.

[0039] Based on the above reasons, by setting the relationship between H1, H2 and D2 and D1 according to the above parameter relationship, the width of the impeller 2 can be reduced, and the outer diameter of the blade of the impeller 2 can be increased, so that the impeller 2 can more efficiently push the airflow in the volute 1 through the air outlet 101 into the air outlet pipe 3, thereby enhancing the wind pressure and air volume output capacity of the gas water heater fan. Specifically, when the width of the impeller 2 is reduced, it can be adapted to the pipe diameter of the air outlet end of the air outlet pipe 3 (i.e. the end of the air outlet pipe 3 connected to the smoke pipe of the air inlet and outlet port 101), in this way, not only the utilization efficiency of the blade can be improved, but also the airflow can flow more smoothly through the air outlet pipe 3, reducing turbulence and energy loss, thereby improving the efficiency and performance of the gas water heater fan, and thus even in the case that the pipe diameter of the air outlet pipe 3 is reduced, resulting in an increase in the smoke exhaust resistance at the air outlet 101 of the gas water heater fan, the gas water heater fan can still provide sufficient air volume at the same speed. Secondly, by increasing the outer diameter of the blade of the impeller 2, the area swept by the impeller 2 at the same speed can be increased, thereby the air intake and exhaust capacity of the gas water heater fan can be improved, making up for the loss of air volume due to the reduction of the size of the air outlet end of the air outlet pipe 3.

[0040] In addition, the embodiment makes the relationship between H1 and D1 satisfy 0.95≤H1 / D1≤1.05, which can ensure that the airflow in the volute 1 flows to the air outlet 101 smoothly and stably, and avoid vortex phenomenon. Secondly, since a certain gap needs to be left between the impeller 2 and the volute 1 to avoid interference between the impeller 2 and the inner wall of the volute 1 during rotation, further, the embodiment makes the relationship between H2 and D1 satisfy 0.75≤H2 / D1≤0.85, which not only can prevent the impeller 2 from rubbing against the inner wall of the volute 1 during rotation, but also can make the airflow accelerated by the impeller 2 flow to the air outlet 101 along the set path on the volute 1 smoothly and stably.

[0041] It needs to be supplemented that, in the ordinary fan, the outer diameter of the blade of the impeller 2 is generally set to be 1.72 times of the pipe diameter (i.e. D1) of the connection end of the air outlet cylinder 3 and the air outlet 101 of the fan, and the width of the impeller 2 is generally set to be 0.93 times of the pipe diameter (i.e. D1) of the connection end of the air outlet cylinder 3 and the air outlet 101 of the fan. Therefore, when the above parameters are brought into the flow rate (Q) calculation formula of the fan, it can be obtained that: Q=N×2.75(D1) 3 wherein, N is the rotation speed of the fan. Further, in order to ensure that the gas water heater fan of the embodiment meets the requirements in terms of noise, the rotation speed of the gas water heater fan of the embodiment is not greater than that of the ordinary fan. It can be understood that, if the rotation speed of the gas water heater fan is equal to that of the ordinary fan, N in the above formula can be regarded as a constant. Therefore, after H1 and H2 in the embodiment are brought into the above formula, the range of the outer diameter D2 of the blade of the impeller 2 can be deduced as follows:

[0042]

[0043] It needs to be supplemented that, in the embodiment, the value range of D1 is generally: 55mm≤D1≤65mm. Preferably, D1 is 60mm.

[0044] In one embodiment, as shown in Figure 3 the volute 1 includes a first half shell 103 and a second half shell 104 which are butted, and the outer edges of the first half shell 103 and the second half shell 104 towards each other are each provided with a connecting plate 1041, and the first half shell 103 and the second half shell 104 are connected by fasteners penetrating through the connecting plate 1041. Compared with the fan integrally formed, the embodiment divides the volute 1 into the first half shell 103 and the second half shell 104, which can better ensure the symmetry of the volute 1 in the design process, so that the airflow can flow more uniformly and smoothly in the volute 1, reduce the flow resistance, and improve the air volume.

[0045] Further, along the radial direction of the impeller 2, the width of the connecting plate 1041 is M, 0mm≤M≤5mm. It can be understood that the smaller the width M of the connecting plate 1041 is, the better, so that the appearance of the volute 1 can be improved. It can be understood that when the volute 1 is a stretch integrated volute, the width of the connecting plate 1041 can be equal to 0mm.

[0046] In one embodiment, as shown in Figure 2 and Figure 4 , the inner diameter of the blade of the impeller 2 is D3, and the relationship between D3 and D2 is 0.72≤D3 / D2≤0.82. If the inner diameter D3 of the blade of the impeller 2 is too small, the air inlet area of the gas water heater fan will be too small, and the air volume will be reduced. If the inner diameter D3 of the blade of the impeller 2 is too large, the centrifugal force for accelerating the airflow will be too small, and the static pressure will be reduced. Therefore, the present embodiment sets D3 and D2 according to the above relationship, which not only improves the maximum air volume of the gas water heater fan, but also improves the maximum static pressure.

[0047] In one embodiment, as shown in Figure 2 , the volute 1 is provided with an air inlet 102 with a diameter D4 on one side thereof along the axial direction, and the relationship between D4 and D2 is D4≥(D2+1)mm. It can be understood that the present embodiment sets D4 and D2 according to the above relationship, which can ensure that the impeller 2 can be smoothly installed inside the volute 1 during assembly.

[0048] In one embodiment, as shown in Figure 4 , along the length direction of the volute 1, the vertical distance from the end of the air outlet cylinder 3 away from the volute 1 to the center point of the impeller 2 is H3, and the vertical distance from the center point of the impeller 2 to the end of the volute 1 away from the air outlet cylinder 3 is H4; along the width direction of the volute 1, the vertical distances from the center axis point of the impeller 2 to the two ends of the volute 1 are H5 and H6 respectively; the relationships between H3, H4, H5, H6 and D2 satisfy 2.38≤H3 / D2≤2.48, 1.15≤H4 / D2≤1.25, 1.24≤H5 / D2≤1.34, and 1.08≤H6 / D2≤1.18. The present embodiment sets the related dimensions of the volute 1 according to the above relationship, which can optimize the curve shape of the volute 1, so that the airflow can flow more uniformly and smoothly in the volute 1, the flow resistance is reduced, and the air volume is improved.

[0049] It should be noted that when designing the volute 1, the equilateral primitive method or the non-equilateral primitive method can be used.

[0050] In one embodiment, as shown in Figure 4 and Figure 5As shown, the air outlet cylinder 3 comprises a connecting pipe 301 connected with the volute 1, an exhaust pipe 302, and a transition pipe 303 connecting the connecting pipe 301 and the exhaust pipe 302; the diameter D5 of the exhaust pipe 302 is smaller than the diameter D1 of the connecting pipe 301, and the relationship between D5 and D1 is 0.66≤D5 / D1≤0.76; from the connecting pipe 301 to the exhaust pipe 302, the diameter of the connecting pipe 301 decreases.

[0051] In one embodiment, as shown in the drawings, Figure 5 As shown, the transition pipe 303 and the exhaust pipe 302 form an included angle A at the connection, and the value of A is in the range of 142°≤A≤162°. If the included angle A is too small, the size of the connection between the transition pipe 303 and the exhaust pipe 302 will change abruptly, so when the airflow flows through this place, not only will it cause backflow and reduce the exhaust efficiency, but it will also produce a lot of noise. If the included angle A is too large, the overall length of the air outlet cylinder 3 will be too long, occupying too much installation space. Therefore, in the embodiment, the included angle A is set in the above range, which not only ensures the compactness of the overall structure of the air outlet cylinder 3, but also ensures the smoothness of the airflow, reducing the noise generated during the airflow.

[0052] In one embodiment, as shown in the drawings, Figure 3 As shown, an annular boss 1011 is arranged around the air outlet 101, and at least part of the annular boss 1011 extends into the connecting pipe 301 along the axis direction of the air outlet cylinder 3 and is connected with the inner wall of the connecting pipe 301; along the axis direction of the air outlet cylinder 3, the length of the connecting pipe 301 connected with the annular boss 1011 is B, and the value of B is in the range of 0.15≤B / D5≤0.25. By arranging the annular boss 1011 at the air outlet 101, the operator can complete the installation and positioning operation of the air outlet cylinder 3 in a short time, reducing the installation difficulty and improving the installation efficiency. In addition, by setting B and D5 according to the above relationship, not only can the connecting pipe 301 and the annular boss 1011 have enough connection length, but also the length of the air outlet cylinder 3 can be prevented from being too long to cause inconvenience in installation.

[0053] In one embodiment, as shown in the drawings, Figure 5 As shown, along the axis direction of the air outlet cylinder 3, the length of the exhaust pipe 302 is C, and the value of C is in the range of 0.70≤C / D5≤0.80. It should be noted that according to the content described in the background art, the air outlet cylinder 3 also needs to be connected with the inlet and outlet air port 101 smoke pipe of the gas water heater. Generally, the inlet and outlet air port 101 smoke pipe is sleeved outside the exhaust pipe 302, so in the embodiment, C and D5 are set according to the above relationship, not only can the exhaust pipe 302 and the inlet and outlet air port 101 smoke pipe have enough connection length, but also the length of the air outlet cylinder 3 can be prevented from being too long to cause inconvenience in installation.

[0054] According to the embodiment of the present application, on the other hand, as Figure 6 shown, a gas water heater is also provided, comprising: a shell 4 and the above-mentioned gas water heater fan. Specifically, the shell 4 is provided with a cavity 401 and an opening communicating with the cavity 401, and the opening is connected with a smoke exhaust pipe 402; the volute 1 is arranged in the cavity 401, and at least part of the air outlet tube 3 extends into the smoke exhaust pipe 402.

[0055] Compared with the existing gas water heater, the gas water heater provided with the above-mentioned gas water heater fan can effectively eliminate the negative influence of the reduced diameter of the smoke exhaust pipe on the exhaust capacity of the gas water heater. In this way, the exhaust performance of the gas water heater is not affected, the requirement for the installation space is reduced, and the production cost of the gas water heater is also reduced.

[0056] In one embodiment, as Figure 6 shown, the smoke exhaust pipe 402 comprises a smoke outlet pipe 4021 sleeved outside the air outlet tube 3 and an air inlet pipe 4022 sleeved outside the smoke outlet pipe 4021, and a first gap 5 is left between the inner wall of the air inlet pipe 4022 and the outer wall of the smoke outlet pipe 4021; a second gap 6 is left between the air outlet tube 3 outside the smoke outlet pipe 4021 and the opening, and the second gap 6 is not less than the first gap 5. It should be noted that the first gap 5 between the inner wall of the air inlet pipe 4022 and the outer wall of the smoke outlet pipe 4021 is communicated with the cavity 401 of the shell 4 through the second gap 6 between the air outlet tube 3 outside the smoke outlet pipe 4021 and the opening, so that the oxygen in the external environment can enter the inside of the gas water heater and mix with the gas for combustion. Since the connection between the air outlet tube 3 and the smoke outlet pipe 4021 is located at the opening of the shell 4, the second gap 6 is required to be not less than the first gap 5 in this embodiment, so as to avoid that the air inlet pipe 4022 excessively blocks the opening and ensure the smoothness of the path for the oxygen in the external environment to enter the inside of the gas water heater.

[0057] It should be noted that, in order to enable the ordinary strong exhaust type gas water heater to share the smoke exhaust pipe 402 with the balanced type gas water heater, the diameter of the smoke outlet pipe 4021 should be equal to the diameter D1 of the end of the air outlet tube 3 close to the volute 1 as far as possible. Further, in order to ensure that the air inlet area is close to the air outlet area, D5 x D5 / (D1 x D1) = 1 / 2 is required, so that D5 / D2 is 0.66≤D1 / D2≤0.76.

[0058] The effects of the technical scheme of the present embodiment will be described below in combination with some embodiments and comparative examples. The specific parameters are shown in Table 1, Table 2 and Figure 7 .

[0059] Embodiment 1: The connecting pipe 301 of the air outlet cylinder 3 is connected to the air outlet 101 of the fan of the gas water heater of the embodiment, the diameter of the connecting pipe 301 of the air outlet cylinder 3 is set to 60 mm, and the diameter of the exhaust pipe 302 of the air outlet cylinder 3 is set to 43.5 mm;

[0060] Comparative Example 1: The connecting pipe of the air outlet cylinder is connected to the air outlet of a common integrated stretch volute fan (for convenience of description, hereinafter referred to as "common fan"), and the diameter of the connecting pipe and the diameter of the exhaust pipe of the air outlet cylinder are both set to 60 mm;

[0061] Comparative Example 2: The connecting pipe of the air outlet cylinder is connected to the air outlet of a common integrated stretch volute fan (for convenience of description, hereinafter referred to as "common fan"), and the diameter of the connecting pipe of the air outlet cylinder is set to 60 mm, and the diameter of the exhaust pipe of the air outlet cylinder is set to 43.5 mm.

[0062] Table 1

[0063]

[0064] According to the data of Comparative Example 1, when the common fan adopts a straight cylinder type air outlet cylinder, the maximum air volume is 115.9 m 3 / h, and the maximum static pressure is 427.1 Pa. It can be seen that if it is assembled on a balanced gas water heater, the exhaust capacity of the balanced gas water heater can meet the relevant requirements, but in this case, since the diameter of the exhaust pipe of the air outlet cylinder is relatively large, the diameter of the exhaust pipe sleeved outside the air outlet cylinder also needs to be adaptively increased, which not only increases the production cost of the exhaust pipe, but also increases the harshness of the installation environment of the exhaust pipe. However, according to the data of Comparative Example 2, if the diameter of the exhaust pipe of the air outlet cylinder is directly reduced, the maximum air volume of the common fan will decrease to 98.1 m 3 / h, and the maximum static pressure will rise to 527.6 Pa. The specific reasons are as follows: after the diameter of the exhaust pipe is reduced, the flow resistance of the fan will increase, so the maximum air volume will decrease; and since the output pressure of the volute impeller is constant, the maximum static pressure will increase. It can be seen that if it is assembled on a balanced gas water heater, the exhaust capacity of the balanced gas water heater cannot meet the relevant requirements. In contrast, after the air outlet cylinder 3 with a reduced diameter of the exhaust pipe 302 is assembled on the fan of the gas water heater of the embodiment, the maximum air volume can reach 120.2 m 3The maximum static pressure can reach 605.3 Pa. Therefore, if the gas water heater fan of the embodiment is assembled on the balanced gas water heater, the exhaust requirement of the balanced gas water heater can be met, and the exhaust capacity of the balanced gas water heater can be improved. Secondly, the pipe fitting of the exhaust pipe 402 can be reduced, the production cost of the exhaust pipe 402 can be reduced, and the installation convenience of the exhaust pipe 402 can be improved. In addition, according to the data in Table 1, it can be known that the rotating speed of the gas water heater fan of the embodiment when providing the maximum air volume is lower than that of the ordinary fan. Therefore, after the gas water heater fan of the embodiment is assembled on the balanced gas water heater, the noise of the balanced gas water heater during operation can be reduced.

[0065] Table II

[0066]

[0067]

[0068] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. In order to make the description simple, all possible combinations of the above technical features are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the description.

[0069] The specific contents of the above specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A gas water heater fan, characterized in that: The device includes a volute (1) and an impeller (2) disposed within the volute (1); an air outlet (101) is provided on the arc-shaped side of the volute (1), and the air outlet (101) is connected to an air outlet duct (3); the diameter of the air outlet duct (3) near the end of the volute (1) is D1; ​​along the axial direction of the volute (1), the width of the arc-shaped side of the volute (1) is H1, and the width of the impeller (2) is H2. The relationship between H1, H2 and D1 is: 0.95≤H1 / D1≤1.05, 0.75≤H2 / D1≤0.85; the outer diameter of the blade of the impeller (2) is D2, and the relationship between D2 and D1 is: 1.84≤D2 / D1≤1.

94.

2. The gas water heater fan according to claim 1, characterized in that: The inner diameter of the blade of the impeller (2) is D3, and the relationship between D3 and D2 is: 0.72≤D3 / D2≤0.

82.

3. The gas water heater fan according to claim 1, characterized in that: The volute (1) has an air inlet (102) with a diameter of D4 on one of its axial sides, and the relationship between D4 and D2 is: D4≥(D2+1)mm.

4. The gas water heater fan according to claim 1, characterized in that: Along the length direction of the volute (1), the vertical distance from the end of the air outlet (3) away from the volute (1) to the center point of the impeller (2) is H3, and the vertical distance from the center point of the impeller (2) to the end of the volute (1) away from the air outlet (3) is H4; along the width direction of the volute (1), the vertical distances from the central axis point of the impeller (2) to both ends of the volute (1) are H5 and H6, respectively; the relationship between H3, H4, H5 and H6 and D2 satisfies: 2.38≤H3 / D2≤2.48, 1.15≤H4 / D2≤1.25, 1.24≤H5 / D2≤1.34, 1.08≤H6 / D2≤1.

18.

5. The gas water heater fan according to any one of claims 1 to 4, characterized in that: The air outlet duct (3) includes a connecting pipe (301) connected to the volute (1), an exhaust pipe (302), and a transition pipe (303) connecting the connecting pipe (301) and the exhaust pipe (302); the diameter D5 of the exhaust pipe (302) is smaller than the diameter D1 of the connecting pipe (301), and the relationship between D5 and D1 is: 0.66≤D5 / D1≤0.76; from the connecting pipe (301) to the exhaust pipe (302), the diameter of the connecting pipe (301) decreases.

6. The gas water heater fan according to claim 5, characterized in that: The connection between the transition pipe (303) and the exhaust pipe (302) forms an included angle A, and the value of A is in the range of 142°≤A≤162°.

7. The gas water heater fan according to claim 5, characterized in that: The air outlet (101) is provided with an annular boss (1011) surrounding the air outlet (101). At least part of the annular boss (1011) extends along the axial direction of the air outlet (3) into the connecting pipe (301) and connects to the inner wall of the connecting pipe (301). Along the axial direction of the air outlet (3), the length of the connection between the connecting pipe (301) and the annular boss (1011) is B, and the value range of B is: 0.15≤B / D5≤0.

25.

8. The gas water heater fan according to claim 5, characterized in that: Along the axial direction of the air outlet duct (3), the length of the exhaust pipe (302) is C, and the value range of C is: 0.70≤C / D5≤0.

80.

9. A gas water heater, characterized in that: include: The housing (4) has a cavity (401) and an opening communicating with the cavity (401), and a smoke exhaust pipe (402) is connected to the opening; The gas water heater fan according to any one of claims 1 to 8, wherein the volute (1) is disposed in the cavity (401), and at least a portion of the air outlet (3) extends into the flue pipe (402).

10. The gas water heater according to claim 9, characterized in that: The exhaust pipe (402) includes an exhaust pipe (4021) sleeved outside the exhaust duct (3) and an intake pipe (4022) sleeved outside the exhaust pipe (4021). A first gap (5) is left between the inner wall of the intake pipe (4022) and the outer wall of the exhaust pipe (4021). A second gap (6) is left between the exhaust duct (3) located outside the exhaust pipe (4021) and the opening. The second gap (6) is not less than the first gap (5).

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