Fan volute, fan and water heater

Abstract

The utility model belongs to the technical field of water heaters, and particularly discloses a fan volute, a fan and a water heater, the fan volute comprises a first nut and a volute body formed by injection molding, the volute body is provided with a connector, the inner wall of the connector is provided with a boss, the boss is provided with an embedding hole, and the position, corresponding to the embedding hole, of the connector is coaxially provided with an extending hole in a penetrating mode. And the first nut is embedded in the embedding hole and the extending hole. The fan comprises the fan volute and a wind wheel located in the fan volute, the water heater comprises the fan, a support and a combustor, and the fan is connected with the combustor through the support. The fan volute and the fan are high in structural strength and not prone to damage, and the manufacturing cost and the later maintenance cost of a water heater are low.

Description

TECHNICAL FIELD

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

[0002] The fan volute of injection molding is widely used in water heater because of low cost, in order to connect fan and combustion chamber, the interface position of fan volute and combustion chamber is embedded with insert nut during injection molding, fastener can be arranged in insert nut and support fixed in combustion chamber, thereby fixing fan on combustion chamber.

[0003] Considering the cost of fan volute manufacturing and installation space, the thickness of fan volute is limited, which leads to insufficient connection strength between insert nut and fan volute, when assembling fan to combustion chamber or fan is vibrated, insert nut is subjected to radial load, and it is very likely to shake and cause fan volute damage, and seriously, it can cause the whole fan volute to be scrapped, greatly increasing the manufacturing cost and maintenance cost of water heater. SUMMARY

[0004] One of the technical problems solved by the utility model is to provide a fan volute, which can solve the problems of insufficient connection strength between insert nut and fan volute and easy damage of fan volute.

[0005] The second technical problem solved by the utility model is to provide a fan, which can solve the problem of easy damage of fan volute.

[0006] The third technical problem solved by the utility model is to provide a water heater, which can solve the problems of high manufacturing cost and maintenance cost of water heater.

[0007] The first technical problem is solved by the following technical scheme:

[0008] A fan volute, comprising a first nut and an injection molded volute body, the volute body is provided with an interface, the inner wall of the interface is provided with a boss, the boss is provided with an embedded hole, the inner wall of the interface is coaxially provided with an extension hole at the position corresponding to the embedded hole, and the first nut is embedded in the embedded hole and the extension hole.

[0009] Compared with the background technology, the fan volute has the beneficial effects that: the thickness of the connection between the volute body and the first nut is increased by the setting of the boss, thereby increasing the contact area of the first nut and the volute body, and further improving the connection strength of the first nut and the volute body, and reducing the possibility of fan volute damage.

[0010] In one embodiment, the two axial ends of the first nut are flush with the outer wall surface of the interface and the end face of the boss away from the inner wall surface of the interface, respectively.

[0011] In one embodiment, the first nut includes a large-diameter end and a small-diameter end connected axially, the large-diameter end being fitted into the recess, and the small-diameter end extending toward the extension hole. The outer diameter of the small-diameter end of the first nut is φs, and the outer diameter of the large-diameter end of the first nut is φb.

[0012] In one embodiment, φb-φs≥2mm.

[0013] In one embodiment, the boss is cylindrical and has a diameter of φz, where φz-φb≥3mm.

[0014] In one embodiment, the outer periphery of the first nut is provided with a plurality of serrations along the circumferential direction, and there is a gap between adjacent serrations.

[0015] In one embodiment, a plurality of serrations arranged circumferentially along the first nut together form an annular protrusion, the outer diameter of which is φc, φs≤φc≤φb.

[0016] In one embodiment, the outer diameter of the thread inside the minor diameter end of the first nut is φs1, where φs-φs1≥3mm.

[0017] The second technical problem mentioned above is solved by the following technical solution:

[0018] A wind turbine includes a wind turbine rotor and a wind turbine casing as described in any of the preceding claims, wherein the wind turbine rotor is located within the wind turbine casing.

[0019] Compared with the prior art, the fan described in this utility model has the following advantages: because the connection strength between the first nut in the fan volute and the volute body is high, the fan volute is not easily damaged when the first nut is subjected to radial load.

[0020] The third technical problem mentioned above is solved by the following technical solution:

[0021] A water heater includes a combustion chamber, a bracket, and the aforementioned fan. The fan is fixed to the combustion chamber by the bracket, and the bracket is sleeved outside the interface and fixedly connected to the fan by a fastener passing through the first nut.

[0022] Compared with the prior art, the water heater described in this utility model has the following advantages: because the fan casing is not easily damaged, the manufacturing and maintenance costs of the water heater are reduced. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the fan volute provided in the embodiment of this utility model;

[0024] Figure 2 This is a cross-sectional view of the fan casing provided in an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure of the first nut provided in an embodiment of this utility model;

[0027] Figure 5 This is a cross-sectional view of the first nut provided in an embodiment of this utility model.

[0028] Label Explanation:

[0029] 1. Volute body; 11. Main housing; 111. Air outlet; 112. First mounting ear; 12. Cover plate; 121. Air inlet; 122. Second mounting ear; 13. Interface; 14. Boss;

[0030] 2. First nut; 21. Large diameter end; 22. Small diameter end; 23. Serrated edge;

[0031] 3. Second nut. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a fan volute, including a first nut 2 and an injection-molded volute body 1. The volute body 1 is provided with an interface 13 for connecting to the combustion chamber. An air outlet channel is formed in the interface 13. A boss 14 is provided on the inner wall of the interface 13. An insert hole is provided on the boss 14. An extension hole is coaxially provided on the inner wall of the interface 13 corresponding to the position of the insert hole. The first nut 2 is embedded in the insert hole and the extension hole.

[0037] The aforementioned fan volute has a boss 14 on the inner wall of the interface 13. The first nut 2 is embedded in the hole opened on the boss 14 and the extension hole opened on the interface 13, which is equivalent to increasing the contact area between the first nut 2 and the volute body 1, improving the stability of the connection between the first nut 2 and the volute body 1, resulting in high structural strength and reducing the possibility of damage to the fan volute due to radial load on the first nut 2.

[0038] In this embodiment, the two axial ends of the first nut 2 are flush with the outer wall surface of the interface 13 and the end face of the boss 14 away from the inner wall surface of the interface 13, respectively, so as to maximize the contact area between the first nut 2 and the volute body 1 without the first nut 2 protruding from the outer wall surface of the interface 13, and further improve the stability of the connection between the first nut 2 and the volute body 1.

[0039] When the aforementioned fan casing is connected to the combustion chamber, a bracket fitted around the interface 13 and fixedly connected to the combustion chamber is used for connection. The bracket is fixed to the interface 13 by fasteners passing through the first nut 2. Therefore, it can be understood that the reason why the first nut 2 does not protrude from the outer wall of the interface 13 is to prevent a gap between the interface 13 and the bracket, which would affect the sealing performance. The reason why the first nut 2 does not protrude from the end of the boss 14 away from the inner wall of the interface 13 is to avoid the first nut 2 occupying too much axial space, which would affect airflow, lead to poor fluid performance, and generate obvious noise. Moreover, compared to the first nut 2 protruding from the boss 14, it is more aesthetically pleasing.

[0040] Considering the processing difficulty and connection stability, in this embodiment, four first nuts 2 and four corresponding bosses 14 are provided, with two first nuts 2 located on the top wall of the interface 13 and the other two first nuts 2 located on the bottom wall of the interface 13. Specifically, in order to allow air to pass smoothly through the bosses 14, the bosses 14 are set in a cylindrical shape.

[0041] refer to Figures 3-5 As shown, the first nut 2 is a T-nut, comprising a large-diameter end 21 and a small-diameter end 22 connected axially. The large-diameter end 21 is fitted into a recess, while the small-diameter end 22 extends towards the extension hole. When the fastener used to connect the bracket and the fan casing is inserted from the outside of the interface 13 from the small-diameter end 22 towards the large-diameter end 21 of the first nut 2, the large-diameter end 21 increases the axial tensile strength and radial torsional strength of the first nut 2.

[0042] Specifically, the outer diameter of the small diameter end 22 of the first nut 2 is φs, the outer diameter of the large diameter end 21 of the first nut 2 is φb, the diameter of the boss 14 is φz, φb-φs≥2mm to have better axial tensile strength and radial torsional strength, and φz-φb≥3mm to meet the strength requirements of the connection between the first nut 2 and the volute body 1.

[0043] Continue to refer to Figure 4 As shown, the outer circumference of the small-diameter end 22 of the first nut 2 is provided with multiple serrations 23, with gaps between adjacent serrations 23. The serrations 23 further improve the axial tensile strength and radial torsional strength of the first nut 2, while the gaps between adjacent serrations 23 enhance the connection strength between the first nut 2 and the boss 14 and the volute body 1. Specifically, depending on the length of the small-diameter end 22, the serrations 23 can be arranged in multiple turns along the axial direction of the first nut 2, or only one turn. In this embodiment, the axial length of the small-diameter end 22 is greater than the axial length of the large-diameter end 21, and the serrations 23 are arranged in three turns along the axial direction of the small-diameter end 22.

[0044] Multiple serrations 23 arranged along the circumference of the first nut 2 together form an annular protrusion. Specifically, the outer diameter of the annular protrusion is φc, φs≤φc≤φb, so as to avoid affecting the higher axial tensile force and radial torsional force caused by the large diameter end 21.

[0045] Understandably, the first nut 2 is typically embedded within the volute body 1 during injection molding. Due to the high fluidity of molten plastic, it easily flows into the first nut 2, clogging the threads in its threaded hole. Therefore, the outer diameter of the thread in the smaller diameter end 22 is φs1, where φs - φs1 ≥ 3mm. This ensures that during injection molding of the volute body 1, the injection mold has sufficient space to hold the first nut 2 in place, thus sealing its threaded hole and preventing plastic from flowing in and clogging the threads, which would affect subsequent assembly.

[0046] refer to Figure 1 As shown, the volute body 1 includes a main body and the aforementioned interface 13. The main body is approximately circular, and an inner cavity for accommodating the impeller is formed within it. An air inlet 121 is also formed on the top wall of the main body. An air outlet channel within the interface 13 connects to the inner cavity of the main body, and the end of the air outlet channel away from the inner cavity connects to the outside through an air outlet 111. To limit the support when it is fitted onto the interface 13, ensuring that the connecting hole on the support for fasteners aligns with the first nut 2, thus reducing the difficulty of assembling the blower volute onto the combustion chamber, a limiting step is formed between the interface 13 and the main body. When the support is fitted onto the interface 13, it can abut against the end face of the main body connected to the interface 13.

[0047] Specifically, the volute body 1 includes a main housing 11 and a cover plate 12. The main housing 11 is configured as a groove-shaped structure with an opening at the top. The cover plate 12 seals the opening and, together with the main housing 11, forms a cavity and an air outlet channel. The air outlet 111 is located on the side wall of the main housing 11, and the air inlet 121 is located on the cover plate 12. The separate configuration of the volute body 1 reduces the processing difficulty of the volute body 1 and the difficulty of assembling the impeller within the volute body 1. More specifically, both the main housing 11 and the cover plate 12 are injection molded from BMC material. BMC material has excellent insulation properties and good structural performance, and is low in cost.

[0048] In order to achieve the connection between the main housing 11 and the cover plate 12, a first mounting ear 112 and a second mounting ear 122 are respectively provided on the top side wall of the main housing 11 and the outer peripheral wall of the cover plate 12. A second nut 3 is embedded in one of the first mounting ear 112 and the second mounting ear 122, and a through hole is opened on the other. The main housing 11 and the cover plate 12 are fixedly connected by fasteners inserted into the second nut 3 and the through hole.

[0049] For example, the second nut 3 is embedded in the second mounting ear 122, and three second nuts 3 are spaced apart along the circumference of the cover plate 12. Specifically, in order to improve the connection strength between the second nut 3 and the fastener, the end of the second nut 3 facing away from the main housing 11 and the top of the second nut 3 protrude from the upper surface of the cover plate 12.

[0050] An embodiment of this utility model also proposes a fan, including the above-mentioned fan casing, impeller and motor, wherein the impeller is installed in the casing body 1 and connected to the motor.

[0051] In this embodiment of the utility model, a water heater is also proposed, including the above-mentioned fan, bracket and combustion chamber. The fan is connected to the combustion chamber through the bracket. The bracket is sleeved outside the interface 13 of the volute body 1 and is fixedly connected to the volute body 1 by fasteners passing through the first nut 2.

[0052] Since the aforementioned fan includes the aforementioned fan casing, the fan breakage rate is reduced, which indirectly reduces the manufacturing and maintenance costs of the water heater.

[0053] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0054] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fan casing, characterized in that, The device includes a first nut (2) and an injection-molded volute body (1). The volute body (1) is provided with an interface (13). The inner wall of the interface (13) is provided with a boss (14). The boss (14) has an insert hole. The inner wall of the interface (13) is coaxially provided with an extension hole corresponding to the position of the insert hole. The first nut (2) is embedded in the insert hole and the extension hole.

2. The fan casing according to claim 1, characterized in that, The two axial ends of the first nut (2) are flush with the outer wall surface of the interface (13) and the end face of the boss (14) away from the inner wall surface of the interface (13), respectively.

3. The fan casing according to claim 1, characterized in that, The first nut (2) includes a large-diameter end (21) and a small-diameter end (22) connected axially. The large-diameter end (21) is embedded in the recess, and the small-diameter end (22) extends in the direction of the extension hole. The outer diameter of the small-diameter end (22) of the first nut (2) is φs, and the outer diameter of the large-diameter end (21) of the first nut (2) is φb.

4. The fan casing according to claim 3, characterized in that, φb-φs≥2mm.

5. The fan casing according to claim 3, characterized in that, The boss (14) is cylindrical, and the diameter of the boss (14) is φz, where φz-φb≥3mm.

6. The fan casing according to claim 3, characterized in that, The first nut (2) has a plurality of serrations (23) arranged circumferentially on its outer periphery, and there is a gap between adjacent serrations (23).

7. The fan casing according to claim 6, characterized in that, The multiple serrations (23) arranged along the circumference of the first nut (2) together form an annular protrusion, the outer diameter of the annular protrusion being φc, where φs≤φc≤φb.

8. The fan casing according to claim 3, characterized in that, The outer diameter of the thread inside the small diameter end (22) of the first nut (2) is φs1, and φs-φs1≥3mm.

9. A fan, characterized in that, It includes a wind turbine rotor and a wind turbine volute as described in any one of claims 1-8, wherein the wind turbine rotor is located within the wind turbine volute.

10. A water heater, characterized in that, It includes a combustion chamber, a support, and a fan as described in claim 9, wherein the fan is fixed to the combustion chamber by the support, and the support is sleeved outside the interface (13) and fixedly connected to the fan by a fastener passing through the first nut (2).

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