Volute Assembly

Abstract

The volute assembly includes a volute (112), the volute (112) including a volute body (122) and a discharge pipe (124), the volute body (122) defining an inner chamber (132), the discharge pipe (124) defining a discharge passage (134), the volute body (122) and the discharge pipe (124) being connected to each other, the discharge passage (134) communicating with the inner chamber (132). The volute assembly further includes a volute tongue (114), the volute tongue (114) being detachably attached to the volute (112) and configured such that the inner chamber (132) and the discharge passage (134) are located on opposite sides of the volute tongue (114) when the volute tongue (114) is attached to the volute (112).

Description

[Technical Field]

[0001] FIELD OF THE INVENTION This application relates to the field of volutes, and more particularly to volute assemblies. [Background technology]

[0002] In the prior art, a volute assembly includes a volute and a volute tongue, which are manufactured by integral casting. Summary of the Invention

[0003] SUMMARY OF THE INVENTION An exemplary embodiment of the present application can solve at least some of the above problems. The present application provides a volute assembly. The volute assembly includes a volute and a volute tongue. The volute includes a volute body defining an inner chamber and a discharge pipe defining a discharge passage, the volute body and the discharge pipe being connected to each other, and the discharge passage communicating with the inner chamber. The volute tongue is removably attached to the volute, and is configured such that when the volute tongue is attached to the volute, the inner chamber and the discharge passage are located on opposite sides of the volute tongue.

[0004] According to the above volute assembly, the volute assembly further includes at least one connecting member, and the volute tongue is configured to be attached to the volute via the connecting member.

[0005] According to the above volute assembly, the volute has at least one volute connecting hole thereon, and the volute tongue has at least one volute tongue connecting hole thereon. A connecting member is inserted into the volute connecting hole and the volute tongue connecting hole, thereby attaching the volute tongue to the volute.

[0006] According to the above volute assembly, the volute further includes a volute connection portion, the volute connection portion being connected to the volute body and the discharge pipe, and at least one volute connection hole is disposed in the volute connection portion.

[0007] According to the above volute assembly, the volute connection portion includes a volute connection portion inner surface and a volute connection portion outer surface arranged to face each other, the volute connection portion inner surface facing the inner chamber, and the volute connection portion outer surface facing the discharge flow passage. At least one volute connection hole is formed by recessing from the volute connection portion inner surface to the volute connection portion outer surface.

[0008] According to the above volute assembly, the volute tongue includes a volute tongue inner surface and a volute tongue outer surface arranged to face each other, the volute tongue inner surface facing the inner chamber, and the volute tongue outer surface facing the discharge flow passage.

[0009] According to the above volute assembly, the volute tongue outer surface and the volute tongue inner surface at the inclined portion have a first intersection point away from the discharge pipe and a second intersection point close to the discharge pipe, and a coordinate system is formed by using the first intersection point as the origin, the direction connecting the first intersection point to the second intersection point as the positive direction of the horizontal coordinate, and the direction from the volute tongue inner surface to the volute tongue outer surface as the positive direction of the vertical coordinate. In the coordinate system, the curves of the volute tongue inner surface and the volute tongue outer surface are

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[0010] According to the above volute assembly, the acute angle between the inclined portion and the central axis of the volute has a value ranging from 40° to 50°.

[0011] According to the above-mentioned volute assembly, the volute tongue includes a volute tongue free end and a volute tongue connection end arranged opposite each other, and an abutment portion, the abutment portion being formed by extending from the volute tongue connection end along the circumference of the volute assembly and being used to abut against the volute connection portion, and at least one volute tongue connection hole being provided on the abutment portion.

[0012] According to the above volute assembly, the volute tongue connection end and the volute connection portion are provided with guide structures to attach the volute tongue to the volute connection portion.

[0013] According to the above volute assembly, the contact surface between the abutment portion and the volute connection portion is flat.

[0014] According to the above volute assembly, the angle between the plane and the central axis of the volute assembly at the inclined portion ranges from 30° to 60°.

[0015] According to the above volute assembly, the volute tongue further includes a first surface and a second surface arranged to face each other, and the first surface and the second surface are arranged between the inner surface and the outer surface of the volute tongue. The first surface and the second surface of the volute tongue each abut against the volute body.

[0016] According to the above volute assembly, the cross section of the discharge passage is circular.

[0017] According to the above volute assembly, the volute is manufactured by casting, and the volute tongue is manufactured by machining.

[0018] According to the above volute assembly, the volute body includes an opening, and the opening is ring-shaped.

[0019] The volute tongue according to the present application can be detachably attached to the volute so that different processing modes may be adopted for the volute tongue and the volute, thereby realizing high flow path smoothness.

[0020] The features and advantages of the present application can be better understood by reading the following detailed description in conjunction with the accompanying drawings, in which like legends refer to like parts throughout. [Brief explanation of the drawings]

[0021] [Figure 1] 1A and 1B are three-dimensional views of a volute assembly according to the present application; [Figure 2] Figure 2A is an exploded view of the volute assembly shown in Figure 1A. Figure 2B is a three-dimensional view of the volute assembly shown in Figure 1A. [Figure 3] FIG. 1B is a three-dimensional view of the volute tongue shown in FIG. 1A. [Figure 4]FIG. 1B is an axial cross-sectional view of the volute assembly shown in FIG. 1A. [Figure 5] FIG. 5 is a cross-sectional view of the volute assembly on the ramp shown in FIG. 4. [Figure 6] FIG. 6 is a diagram of the volute tongue shown in FIG. 5. [Figure 7] FIG. 10 is a cross-sectional view of a second embodiment of a volute tongue on a ramp. [Figure 8A] 1 is a graph of a comparative test of pneumatic efficiency at Mach number 1.1 between an existing volute assembly and a volute assembly according to the present application. [Figure 8B] 1 is a graph of a comparative test of pneumatic efficiency at Mach number 1.3 between an existing volute assembly and a volute assembly according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0022] Various specific implementations of the present disclosure will be described below with reference to the accompanying drawings, which form a part of this specification. It should be understood that directional terms such as "front," "rear," "up," "down," "left," and "right" are used in the present invention to describe the direction or orientation of various exemplary structural parts and elements of the present invention. However, the use of these terms herein is for ease of description only and is determined based on the exemplary orientation shown in the accompanying drawings. Because the embodiments disclosed in the present invention may be oriented in different directions, these directional terms are for illustrative purposes only and are not limiting. The same legends are used for the same parts in the following accompanying drawings.

[0023] FIG. 1A is a three-dimensional view of a volute assembly according to the present application, viewed from front to rear and bottom to top. FIG. 1B is a three-dimensional view of the volute assembly shown in FIG. 1A, viewed from back to front and from top left to bottom right, showing a specific structure of the volute assembly. As shown in FIGS. 1A and 1B, the volute assembly includes a volute 112 and a volute tongue 114. The volute 112 includes a volute body 122 and a discharge pipe 124. The volute assembly has a central axis U extending from front to back. The volute body 122 defines an inner chamber 132. The volute body 122 is formed to substantially surround the central axis U. The volute inlet 101 of the volute assembly is provided at the bottom (i.e., rear surface) of the volute body 122. The front surface of the volute body 122 has an opening 143. The opening 143 is substantially ring-shaped and is used to connect with an additional volute (not shown) such that the additional volute seals the opening 143 .

[0024] Specifically, the volute body 122 includes a cylindrical portion 152 and an arc portion 154. The cylindrical portion 152 is substantially cylindrical and tapers toward the volute inlet 101. The arc portion 154 is provided in front of the cylindrical portion 152 and is disposed so as to surround the outside of the cylindrical portion 152. More specifically, the beginning of the arc portion 154 is located substantially to the right of the front of the cylindrical portion 152. After wrapping around the cylindrical portion 152 approximately three-quarters of the way in a clockwise direction (i.e., in the V direction in FIG. 1A ), the arc portion 154 is connected to the discharge pipe 124 at the top of the cylindrical portion 152. The cylindrical portion 152 defines a cylindrical chamber 155. The arc portion 154 defines a communication passage 156 extending in an arc shape. The inner surface of the communication passage 156 is constantly in communication with the cylindrical chamber 155. The cross section of the communication passage 156 is substantially circular, and the cross-sectional area of ​​the communication passage 156 gradually increases from the starting end toward the connection portion with the discharge pipe 124 .

[0025] As shown in FIG. 1A , the discharge pipe 124 is a substantially arcuate pipe and defines a discharge passage 134. The beginning end of the discharge pipe 124 is located substantially above the volute body 122 and is connected to the arc portion 154. The discharge pipe 124 extends clockwise from above the volute body 122 to the right side. The discharge pipe 124 and the arc portion 154 are integrally formed in a downward spiral. The discharge passage 134 has a circular cross section and communicates with the communication passage 156, forming the volute outlet 103 of the volute assembly at its free end. In this manner, fluid can enter the volute assembly through the volute inlet 101, flow through the cylindrical chamber 155, the communication passage 156, and the discharge passage 134, and then exit through the volute outlet 103. As an example, a fan may be provided within the cylindrical chamber 155 (not shown) to accelerate the fluid entering the volute assembly and expel the accelerated fluid from the volute assembly via the volute outlet 103.

[0026] The volute assembly further includes a volute tongue 114. The volute tongue 114 is detachably attached to the volute 112 and is configured such that the inner chamber 134 and the inner chamber 132 are located on opposite sides of the volute tongue 114 when the volute tongue 114 is attached to the volute 112. As one example, the volute 112 is manufactured by casting, and the volute tongue 114 is manufactured by machining. As another example, the surface of the volute tongue 114 has a coating. For example, the coating uses PTFE or epoxy resin.

[0027] FIG. 2A is an exploded view of the volute assembly shown in FIG. 1A. As shown in FIG. 2A, the volute assembly further includes two connecting members 216. The volute tongue 114 can be attached to the volute 112 via the connecting members 216. Specifically, the volute 112 further includes a volute connection portion 252. The volute connection portion 252 is connected to the volute body 122 and the discharge pipe 124 and is located substantially at the connection portion between the arc portion 154 and the discharge pipe 124. The volute connection portion 252 has two volute connection holes 242 formed thereon. The volute tongue 114 has two volute tongue connection holes 244 formed thereon. The connecting members 216 are inserted into the volute tongue connection holes 244 and the volute connection holes 242, thereby connecting the volute tongue 114 and the volute 112. As an example, the connecting member 216 is a threaded bolt. The inner wall of the volute connecting hole 242 is formed with a thread for engaging with the threaded bolt.

[0028] 2B is a three-dimensional view of the volute 112 shown in FIG. 2A. As shown in FIG. 2B, the volute connection portion 252 includes a volute connection portion inner surface 202 and a volute connection portion outer surface 204 that are arranged to face each other. The volute connection portion inner surface 202 faces the inner chamber 132, and the volute connection portion outer surface 204 faces the discharge passage 134. The volute connection hole 242 is formed by recessing from the volute connection portion inner surface 202 to the volute connection portion outer surface 204. The volute connection portion inner surface 202 is farther from the central axis U than the inner wall of the inner chamber 132 so that the volute connection portion inner surface 202 and the inner wall of the inner chamber 132 form a stepped portion. When attaching the volute tongue 114 to the volute 112, the volute tongue 114 only needs to abut the volute connection portion inner surface 202. The volute connection portion 252 is further provided with a dovetail groove 232. The dovetail groove 232 is formed by extending at an angle along the tilt axis Z (see FIG. 3).

[0029] Figure 3 is a three-dimensional view of the volute tongue 114 shown in Figure 2, illustrating a first embodiment of the volute tongue 114. As shown in Figure 3, the volute tongue 114 includes a volute tongue inner surface 302 and a volute tongue outer surface 304 arranged opposite each other, and a volute tongue first surface 306 and a volute tongue second surface 308 arranged opposite each other. The volute tongue first surface 306 and the volute tongue second surface 308 are disposed between the volute tongue inner surface 302 and the volute tongue outer surface 304. When the volute tongue 114 is attached to the volute 112, the volute tongue inner surface 302 faces the inner chamber 132, the volute tongue outer surface 304 faces the discharge passage 134 (see FIGS. 4 and 5), and the volute tongue first surface 306 and the volute tongue second surface 308 each abut against the volute body 122. The volute tongue 114 further includes a volute tongue free end 312 and a volute tongue connecting end 314, which are arranged opposite each other. The volute tongue free end 312 is located at one end formed by surrounding the volute tongue inner surface 302, the volute tongue outer surface 304, the volute tongue first surface 306, and the volute tongue second surface 308. An abutment portion 315 is provided on the volute tongue connecting end 314. The abutment portion 315 extends from the volute tongue connection end 314 along the circumference of the volute assembly and is used to abut against the volute connection portion 252. The volute tongue connection hole 244 is disposed on the abutment portion 315. Specifically, the abutment portion 315 includes an abutment portion inner surface 322 and an abutment portion outer surface 324. The abutment portion inner surface 322 is connected to and smoothly transitions to the volute tongue inner surface 302. When the volute tongue 114 is attached to the volute 112, the abutment portion outer surface 324 is in close contact with the volute connection portion inner surface 202, the abutment portion inner surface 322 smoothly transitions to the wall of the inner chamber 132, and the volute tongue outer surface 304 smoothly transitions to the inner wall of the discharge pipe 124. Furthermore, the volute tongue connection end 314 is further provided with a dovetail protrusion 332 thereon. The dovetail protrusion 332 is formed by extending from the abutment outer surface 324 substantially along the tilt axis Z.In the process of attaching the volute tongue 114 to the volute 112, the dovetail protrusion 332 extends into the dovetail groove 232 substantially along the tilt axis Z, thereby guiding the volute tongue 114 to move relative to the volute connection portion 252 and making it easier to attach the volute tongue 114 to the volute connection portion 252.

[0030] Although the present application exemplifies a guide structure including the dovetail groove 232 and the dovetail protrusion 332, other types of guide structures disposed on the volute tongue connection end 314 and the volute connection portion 252 are also within the scope of protection of the present application.

[0031] FIG. 4 is an axial vertical cross-sectional view of the volute assembly shown in FIG. 1A, and describes the tilt axis Z. As shown in FIG. 4, the volute assembly has a central axis U and a tilt axis Z. The central axis of the discharge pipe 124 has a center point K on the vertical cross-section. The tilt axis Z passes through the center point K of the discharge pipe 124, and the acute angle between the tilt axis Z and the central axis U is substantially 40°. The inclined portion is the plane on which the tilt axis Z lies and has an acute angle of approximately 40° with respect to the plane on which the central axis U lies. As an example, in another embodiment, the acute angle between the inclined portion and the central axis U ranges from 40° to 50°. As shown in FIG. 4, in the vertical cross-section, the cross sections of the volute connection inner surface 202 and the volute connection outer surface 204 are arc-shaped. As a result, when the fluid enters the discharge passage 134 from the inner chamber 132, the volute tongue 114 can better guide the fluid, thereby reducing resistance.

[0032] Fig. 5 is a cross-sectional view of the volute assembly on the inclined portion shown in Fig. 4, and Fig. 6 is a line diagram of the volute tongue 114 shown in Fig. 5. Specifically, at the inclined portion, the volute tongue outer surface 304 and the volute tongue inner surface 302 have a first intersection point O away from the discharge pipe 124 and a second intersection point N closer to the discharge pipe 124, forming a coordinate system with the first intersection point O as the origin, the direction connecting the first intersection point O to the second intersection point N as the positive direction of the horizontal coordinate X, and the direction from the volute tongue inner surface 302 toward the volute tongue outer surface 304 as the positive direction of the vertical coordinate Y.

[0033] In the above coordinate system, the curves of the volute tongue outer surface 304 and the volute tongue inner surface 302 are as follows:

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[0034] In the volute tongue 114 having the above-described shape, the volute tongue free end 312 facing the inflow flow is thinned, so that the collision loss when the inflow flow collides with the volute tongue 114 can be reduced.

[0035] Figure 7 is a cross-sectional view of a second embodiment of the volute tongue 114 on the inclined portion shown. The same portions of the volute tongue 114 shown in Figure 7 as those of the volute tongue 114 shown in Figure 3 are not repeated, and the main difference between them is that the contact surface between the abutment portion 315 and the volute connection portion 252 is a flat surface 702. To strengthen the joint strength between the volute tongue 114 and the volute connection portion 252, the value of the angle φ between the flat surface 702 and the central axis of the volute assembly at the inclined portion ranges from 30° to 60°.

[0036] FIG. 8A is a graph showing a comparison test of pneumatic efficiency at a Mach number of 1.1 between an existing volute assembly and a volute assembly according to the present application. The horizontal axis represents the flow coefficient, i.e., the dimensionless number representing the intake air volume. The vertical axis represents the pneumatic efficiency, i.e., the pneumatic efficiency at a standard Reynolds number. Here, the curve for the existing volute assembly is plotted as a solid line, and the curve for the volute assembly according to the present application is plotted as a dotted line. As shown in FIG. 8A, when the flow coefficient is in the range of 0.038 to 0.07, the pneumatic efficiency of the volute assembly according to the present application is higher than that of the existing volute assembly, near the peak point of the pneumatic efficiency (i.e., when the flow coefficient is 0.045 to 0.055), the pneumatic efficiency of the volute assembly according to the present application is approximately 1% higher than that of the existing volute assembly.

[0037] FIG. 8B is a graph showing a comparison test of pneumatic efficiency at a Mach number of 1.3 between an existing volute assembly and a volute assembly according to the present application. The horizontal axis represents the flow coefficient, i.e., the dimensionless number representing the intake air volume. The vertical axis represents the pneumatic efficiency, i.e., the pneumatic efficiency at a standard Reynolds number. Here, the curve for the existing volute assembly is plotted as a solid line, and the curve for the volute assembly according to the present application is plotted as a solid line. As shown in FIG. 8B, when the flow coefficient is in the range of 0.055 to 0.085, the pneumatic efficiency of the volute assembly according to the present application is consistently higher than that of the existing volute assembly. This is near the peak point of the pneumatic efficiency (i.e., when the flow coefficient is 0.0625 to 0.0775), and the pneumatic efficiency of the volute assembly according to the present application is approximately 1% higher than that of the existing volute assembly.

[0038] It should be noted that although two connecting members 216, two volute connecting holes 242 and two volute tongue connecting holes 244 are shown in the present application, any number of connecting members 216 and a corresponding number of volute connecting holes 242 and volute tongue connecting holes 244 fall within the scope of protection of the present application.

[0039] Furthermore, although the present application uses the connecting member 216, which is a threaded bolt, as an example for the purpose of explanation, those skilled in the art should understand that other types of connecting members are also within the scope of protection of the present application. For example, the connecting member 216 is a threaded rod that connects the volute tongue 114 to the volute 112 by an interference fit.

[0040] Most existing volute assemblies are integrally formed by casting. However, the inventors of the present application have found that integrally formed volute assemblies have a relatively rough surface, which results in a decrease in the pneumatic performance of the volute assembly.

[0041] The volute tongue in the volute assembly according to the present application can be detachably attached to the volute, allowing different machining modes to be used for the volute tongue and the volute. For example, the volute tongue can be machined. Therefore, the surface roughness of the volute tongue can reach Ra5 to Ra10, thereby achieving high flow path smoothness. Furthermore, the volute tongue is attached to the volute by positioning using a connecting member, which simplifies the positioning and installation of the volute tongue.

[0042] While the present disclosure will be described in combination with the example embodiments briefly described above, various alternative solutions, modifications, variations, improvements, and / or substantially equivalent solutions, whether known or foreseeable now or in the near future, may all be apparent to at least one skilled in the art. Furthermore, the technical effects and / or technical problems described herein are intended to be illustrative rather than limiting, and thus the disclosure herein may be used to solve other technical problems, have other technical effects, and / or solve other technical problems. Therefore, the example embodiments of the present disclosure described above are intended to be illustrative rather than limiting. Various changes may be made without departing from the spirit or scope of the present disclosure. Consequently, the present disclosure is intended to encompass all alternative solutions, modifications, variations, improvements, and / or substantially equivalent solutions, whether known or developed.

Claims

1. a volute (112) including a volute body (122) and a discharge pipe (124), the volute body (122) defining an inner chamber (132), the discharge pipe (124) defining a discharge passage (134), the volute body (122) and the discharge pipe (124) being connected to each other, and the discharge passage (134) communicating with the inner chamber (132); a volute tongue (114) that is detachably attached to the volute (112), and that is configured such that the inner chamber (132) and the discharge passage (134) are located on opposite sides of the volute tongue (114) when the volute tongue (114) is attached to the volute (112).

2. further comprising at least one connecting member (216); The volute assembly of claim 1, wherein the volute tongue (114) is configured to be attached to the volute (112) via the connecting member (216).

3. The volute (112) has at least one volute connection hole (242) formed thereon, and the volute tongue (114) has at least one volute tongue connection hole (244) formed thereon; 3. The volute assembly according to claim 2, wherein the connecting member (216) is inserted into the volute connection hole (242) and the volute tongue connection hole (244), thereby enabling the volute tongue (114) to be attached to the volute (112).

4. The volute (112) further includes a volute connection (252), the volute connection (252) being connected to the volute body (122) and the discharge pipe (124); The volute assembly according to claim 3, characterized in that the at least one volute connection hole (242) is disposed in the volute connection portion (252).

5. the volute connection portion (252) includes a volute connection portion inner surface (202) and a volute connection portion outer surface (204) arranged to face each other, the volute connection portion inner surface (202) facing the inner chamber (132), and the volute connection portion outer surface (204) facing the discharge flow passage (134); 5. The volute assembly of claim 4, wherein the at least one volute connection hole (242) is recessed from the volute connection inner surface (202) to the volute connection outer surface (204).

6. 6. The volute assembly of claim 5, wherein the volute tongue (114) includes a volute tongue inner surface (302) and a volute tongue outer surface (304) arranged opposite each other, the volute tongue inner surface (302) facing the inner chamber (132), and the volute tongue outer surface (304) facing the discharge passage (134).

7. At the inclined portion, the volute tongue outer surface (304) and the volute tongue inner surface (302) have a first intersection point away from the discharge pipe (124) and a second intersection point close to the discharge pipe (124), and a coordinate system is formed by using the first intersection point as the origin, a connection direction from the first intersection point to the second intersection point as a positive direction of the horizontal coordinate, and a direction from the volute tongue inner surface (302) toward the volute tongue outer surface (304) as a positive direction of the vertical coordinate, In the coordinate system, the curves of the volute tongue inner surface (302) and the volute tongue outer surface (304) are: [Equation 1] [Equation 2] [Equation 3] [Equation 4] [Equation 5] Fulfilling Here, x ｕ , y ｕ are the horizontal and vertical coordinates of each point on the outer surface (304) of the volute tongue, and X ｌ , Y ｌ are the horizontal and vertical coordinates of each point on the volute tongue inner surface (302), the value of t is in the range of 0.06≦t≦0.09, the value of m is in the range of 0.05≦m≦0.09, and the value of p is in the range of 0.4≦p≦0.

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8. 8. The volute assembly according to claim 7, wherein the acute angle between the inclined portion and the central axis of the volute (112) ranges in value from 40° to 50°.

9. The volute tongue (114) includes a volute tongue free end (312) and a volute tongue connecting end (314) arranged to face each other, and an abutment portion (315), the abutment portion (315) being formed by extending from the volute tongue connecting end (314) along the periphery of the volute assembly and being used to abut against the volute connecting portion (252); The volute assembly according to claim 6, characterized in that said at least one volute tongue connection hole (244) is provided on said abutment portion (315).

10. 10. The volute assembly according to claim 9, wherein the volute tongue connection end (314) and the volute connection portion (252) are provided with guide structures to attach the volute tongue (114) to the volute connection portion (252).

11. The volute assembly according to claim 9, characterized in that the contact surface between the abutment portion (315) and the volute connection portion (252) is a flat surface (702).

12. 12. The volute assembly according to claim 11, characterized in that at the inclined portion, the range of values ​​of the angle between the plane (702) and the central axis of the volute assembly is greater than or equal to 30° and less than or equal to 60°.

13. the volute tongue (114) further includes a volute tongue first surface (306) and a volute tongue second surface (308) arranged to face each other, the volute tongue first surface (306) and the volute tongue second surface (308) being arranged between the volute tongue inner surface (302) and the volute tongue outer surface (304); 7. The volute assembly of claim 6, wherein the first surface (306) of the volute tongue and the second surface (308) of the volute tongue each abut the volute body (122).

14. 5. The volute assembly of claim 4, wherein the cross section of the discharge passage (134) is circular.

15. 2. The volute assembly of claim 1, wherein the volute (112) is manufactured by casting and the volute tongue (114) is manufactured by machining.

16. The volute assembly of claim 1, wherein the volute body (122) includes an opening (143), the opening (143) being ring-shaped.

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