A hollow sphere and its manufacturing method

Abstract

This invention provides a hollow sphere and its manufacturing method, belonging to the field of ball valve technology. The hollow sphere includes a shell and a sleeve. The shell has a central cavity with flow channels communicating with the central cavity at both ends. The sleeve is disposed in the central cavity, and its two ends are connected to the corresponding flow channels. It also includes an inner ball sleeve made of elastic material. In its natural state, the inner ball sleeve is spherical and fits the central cavity. When compressed, it can undergo elastic deformation to pass through the flow channels and automatically return to its spherical shape after entering the central cavity. Its outer wall fits against the inner wall of the central cavity. Several support plates are arranged circumferentially between its inner wall and the outer wall of the sleeve. The outer side of the support plate is connected to the inner ball sleeve, and its inner side abuts against the outer wall of the sleeve. In this invention, by installing each support plate on the inner ball sleeve made of elastic material, the quick assembly of each support plate is achieved, avoiding the complexity of traditional welding processes, reducing processing difficulty and manufacturing costs, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, specifically to a hollow ball and its manufacturing method. Background Technology

[0002] In modern industrial production and daily life, valves, as key components of fluid control, directly affect the operating efficiency and safety of the entire system. Among them, ball valves are widely used in petroleum, chemical, power, and metallurgical industries due to their simple structure, good sealing performance, and low fluid resistance. The core component of a ball valve is the ball itself, and its design and manufacturing are crucial to the overall performance of the valve.

[0003] In the prior art, for example, patent publication number CN222416101U discloses a hollow sleeve-type valve ball. This valve ball includes a ball shell and a sleeve. The ball shell has a central cavity and flow channels at both ends communicating with the central cavity. The sleeve is disposed within the central cavity of the ball shell and connected to the flow channels. Multiple support members are also provided on the inner wall of the central cavity to support the sleeve. The hollow structure design reduces the amount of raw materials used, thereby reducing costs and weight. However, in this technical solution, multiple support members need to be welded one by one to the inner wall of the ball shell. This not only makes the process complex and requires high welding precision, but also results in a large amount of welding work, significantly increasing processing difficulty and seriously affecting production efficiency and manufacturing costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a hollow sphere and its manufacturing method.

[0005] The technical solution adopted by the present invention is as follows: In a first aspect, this application provides a hollow sphere, including a shell and a sleeve. The shell has a central cavity, and its two ends are respectively provided with flow channels communicating with the central cavity. The sleeve is disposed in the central cavity, and its two ends are respectively connected to the corresponding flow channels. The shell also includes an inner spherical sleeve. The inner spherical sleeve is made of elastic material and is spherical in its natural state, which is adapted to the central cavity. When squeezed, it can generate elastic deformation to pass through the flow channels. After entering the central cavity, it automatically returns to its spherical shape. Its outer wall is fitted with the inner wall of the central cavity. A plurality of support plates are arranged circumferentially between its inner wall and the outer wall of the sleeve. The outer side of the support plate is connected to the inner spherical sleeve, and its inner side abuts against the outer wall of the sleeve.

[0006] In some embodiments, the outer side of the support plate is integrally injection molded with the inner ball sleeve.

[0007] In some embodiments, a first positioning plate is provided on the outer side of the support plate. The first positioning plate is embedded in the inner ball sleeve and its shape is adapted to the inner wall of the cavity. The first positioning plate abuts against the inner wall of the cavity through the inner ball sleeve or directly against the inner wall of the cavity. A second positioning plate is provided on the inner side of the support plate. The second positioning plate abuts against the outer periphery of the sleeve and its shape is adapted to it.

[0008] In some embodiments, a third positioning plate is provided on the support plate near the first positioning plate, and the first positioning plate and the third positioning plate form an I-shaped structure on the outside of the support plate.

[0009] In some embodiments, the outer side wall of the first positioning plate and the inner wall of the spherical shell are provided with a first positioning protrusion on one side and a first positioning groove on the other side. The inner side wall of the second positioning plate and the outer wall of the sleeve are provided with a second positioning protrusion on one side and a second positioning groove on the other side.

[0010] In some embodiments, the device further includes an upper shaft and a lower shaft. The spherical shell is coaxially provided with an upper outer hole and a lower outer hole. The inner spherical sleeve is coaxially provided with an upper inner hole and a lower inner hole. The upper end of the upper shaft is welded and fixed to the upper outer hole, and its lower end abuts against the outer peripheral wall of the sleeve. The lower end of the lower shaft is welded to the lower outer hole, and its upper end abuts against the outer peripheral wall of the sleeve.

[0011] In some embodiments, the first positioning protrusion and the first positioning groove are provided with matching guide portions on both sides for guiding the first positioning protrusion to be embedded in the first positioning groove.

[0012] In some embodiments, both the upper shaft and the lower shaft are provided with positioning ring grooves, and the inner walls of the upper inner hole and the lower inner hole are provided with positioning protrusions that are adapted to the positioning ring grooves. The upper shaft, the lower shaft, and the inner ball sleeve are integrally injection molded.

[0013] In some embodiments, the two ends of the inner ball sleeve near the flow channel opening abut against the ball shell and the sleeve to form a seal.

[0014] Secondly, this application provides a method for manufacturing the hollow sphere, comprising the following steps: S1: Several support plates, an upper shaft and a lower shaft are pre-placed as inserts in a molding mold, and the inner ball sleeve is injection molded in the mold, so that the support plates, upper shaft, lower shaft and inner ball sleeve are integrally combined to form an elastic assembly assembly; S2: Apply an external force to the elastic assembly component to make it radially inward to a first form, in which the maximum diameter of the outer contour of the elastic assembly component is smaller than the inner diameter of the flow channel, and place it into the middle cavity of the spherical shell through any of the flow channels. S3: When the external force is released, the elastic assembly expands radially outward under the elastic restoring force of the inner ball sleeve, so that the free end of the upper shaft extends out from the upper outer hole and the free end of the lower shaft extends out from the lower outer hole, so that the first positioning plate on the outer side of each support plate fits against the inner wall of the middle cavity of the ball shell. S4: Push the sleeve axially from any of the flow channels, and the outer wall of the sleeve gradually pushes open each of the support plates in the expanded state, forcing each of the support plates to open further radially outward until the first positioning plate on the outer side of each support plate is tightly attached to the inner wall of the cavity, and the second positioning plate on the inner side of each support plate is tightly attached to the outer wall of the sleeve. S5: Continue to advance the sleeve until both ends of the sleeve are connected to the two flow channels respectively; S6: Install a positioning fixture inside the sleeve, weld and fix both ends of the sleeve to the flow channel of the spherical shell, weld and fix the upper shaft to the upper outer hole, and weld and fix the lower shaft to the lower outer hole.

[0015] The beneficial effects of the present invention are as follows: By installing each support plate on an inner ball sleeve made of elastic material, the present invention achieves quick assembly of each support plate, avoids the complexity of traditional welding processes, reduces processing difficulty and manufacturing costs, and improves production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 This is an exploded view of the hollow sphere in this invention; Figure 2 This is a schematic diagram of the hollow sphere in this invention; Figure 3 A cross-sectional view of the hollow sphere in this invention. Figure 1 ; Figure 4 This is a schematic diagram of the first configuration of the support plate in this invention; Figure 5 This is a schematic diagram of a second configuration of the support plate in this invention; Figure 6 This is a schematic diagram of the third configuration of the support plate in this invention; Figure 7 A cross-sectional view of the hollow sphere in this invention. Figure 2 ; Figure 8 This is a schematic diagram of an existing hollow sphere; In the figure, 1-spherical shell, 100-middle cavity, 101-flow channel opening, 2-sleeve, 3-inner ball sleeve, 4-support plate, 41-first positioning plate, 42-second positioning plate, 43-third positioning plate, 51-first positioning protrusion, 52-first positioning groove, 53-second positioning protrusion, 54-second positioning groove, 6-upper shaft, 7-lower shaft, 81-upper outer hole, 82-lower outer hole, 83-upper inner hole, 84-lower inner hole, 85-guide part, 86-positioning ring groove, 87-positioning protrusion. Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "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. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] like Figure 8 As shown, prior art patent CN222416101U discloses a hollow sleeve-type valve ball, which includes a ball shell and a sleeve. The ball shell has a central cavity inside, and each end of the ball shell has a flow channel opening communicating with the central cavity. The sleeve is disposed in the central cavity, and its two ends are connected to the corresponding flow channel openings. To support the sleeve, multiple support members are usually provided on the inner wall of the central cavity. Although this hollow structure reduces the use of raw materials to a certain extent, resulting in lower cost, lighter weight, and more time-saving and labor-saving operation, its manufacturing process is complex. In particular, multiple support members need to be welded to the inner wall of the ball shell one by one, which undoubtedly increases the processing difficulty and production time.

[0026] Based on the above issues, such as Figures 1 to 7 As shown, this application provides a hollow sphere, including a shell 1 and a sleeve 2. The shell 1 has a central cavity 100, and its two ends are respectively provided with flow channels 101 communicating with the central cavity 100. The sleeve 2 is disposed in the central cavity 100, and its two ends are respectively connected to the corresponding flow channels 101. The sleeve 2 is a cylindrical component disposed in the central cavity 100, and its internal channel constitutes the actual flow path of the fluid. Its two ends are fixedly connected to the flow channels 101 by welding, expansion or threading.

[0027] Importantly, the inner ball sleeve 3 is also included. The inner ball sleeve 3 is made of an elastic material, such as rubber, thermoplastic elastomer, or silicone. In its natural state, it is spherical and fits the central cavity 100. When compressed, it undergoes elastic deformation to pass through the flow channel 101. After entering the central cavity 100, it recovers its spherical shape under its own elastic restoring force. Its outer wall fits against the inner wall of the central cavity 100. Several support plates 4 are circumferentially arranged between its inner wall and the outer periphery of the sleeve 2. For example, three, four, or more support plates 4 can be provided to provide uniform support force. The outer side of the support plate 4 is connected to the inner ball sleeve 3, and its inner side abuts against the outer periphery of the sleeve 2. This forms a stable support structure between the sleeve 2 and the spherical shell 1, avoiding the welding of the support plate 4 to the spherical shell 1 in traditional solutions and preventing precision loss due to welding heat deformation, greatly simplifying the assembly process.

[0028] Regarding the connection between the support plate 4 and the inner ball sleeve 3, the connection method of the support plate 4 can be bonding, riveting, or integral molding, etc.

[0029] As a preferred embodiment, the outer side of the support plate 4 is integrally injection molded with the inner ball sleeve 3, which can further simplify the manufacturing process, improve production efficiency, and ensure the connection strength between the support plate 4 and the inner ball sleeve 3.

[0030] In some embodiments, such as Figure 4 As shown, a first positioning plate 41 is provided on the outer side of the support plate 4. The first positioning plate 41 is embedded in the inner spherical sleeve 3, and its shape is adapted to the inner wall of the central cavity 100. The first positioning plate 41 abuts against the inner wall of the central cavity 100 through the inner spherical sleeve 3. The advantage of this structure is that during assembly, the first positioning plate 41 embedded in the inner spherical sleeve 3 does not directly contact the inner wall of the spherical shell 1, but transmits force through the elastic layer of the inner spherical sleeve 3. This provides stable radial support and utilizes the elastic compensation capability of the inner spherical sleeve 3 to reduce the assembly difficulty caused by the manufacturing tolerances of various components.

[0031] In some embodiments, such as Figure 5 As shown, the support plate 4 directly abuts against the inner wall of the cavity 100. Specifically, a third positioning plate 43 is provided on the support plate 4 near the first positioning plate 41. The first positioning plate 41 and the third positioning plate 43 form an I-shaped structure on the outer side of the support plate 4. The advantage of this structure is that the combined action of the first positioning plate 41 and the third positioning plate 43 increases the contact area and bending section modulus between the support plate 4 and the inner wall of the spherical shell 1, allowing the support plate 4 to be more firmly pressed against the inner wall of the spherical shell 1 and the outer wall of the sleeve 2, resulting in better support strength, especially suitable for high-pressure conditions.

[0032] In this application, a second positioning plate 42 is provided on the inner side of the support plate 4. The second positioning plate 42 abuts against the outer periphery of the sleeve 2 and its shape is adapted to it, that is, it is an arc plate. The radius of curvature of the arc plate is consistent with the outer diameter of the sleeve 2 to achieve surface contact fit.

[0033] This configuration, through the placement of the first positioning plate 41 and the second positioning plate 42, prevents the support plate 4 from tilting between the spherical shell 1 and the sleeve 2, greatly improving the structural strength and support strength of the support plate 4.

[0034] Preferably, such as Figure 6 As shown, the outer side wall of the first positioning plate 41 and the inner wall of the spherical shell 1 are provided with a first positioning protrusion 51 on one side and a corresponding first positioning groove 52 on the other side. The inner side wall of the second positioning plate 42 and the outer wall of the sleeve 2 are provided with a second positioning protrusion 53 on one side and a corresponding second positioning groove 54 on the other side. Through the engagement of the protrusion and the groove, the support plate 4 is accurately positioned and stopped in the axial and circumferential directions.

[0035] In some embodiments, the system further includes an upper shaft 6 and a lower shaft 7. The spherical shell 1 is coaxially provided with an upper outer hole 81 and a lower outer hole 82. The inner spherical sleeve 3 is coaxially provided with an upper inner hole 83 and a lower inner hole 84, which is coaxially provided with the upper outer hole 81 and the lower outer hole 82. The upper end of the upper shaft 6 is welded and fixed to the upper outer hole 81, and its lower end abuts against the outer periphery of the sleeve 2. The lower end of the lower shaft 7 is welded to the lower outer hole 82, and its upper end abuts against the outer periphery of the sleeve 2. The ends of the upper shaft 6 and the lower shaft 7 that abut against the sleeve 2 are configured to be in a shape that matches the outer periphery of the sleeve 2, typically an arcuate surface with the same curvature as the outer wall of the sleeve 2, so as to achieve a tight fit.

[0036] Furthermore, to guide assembly, the first positioning protrusion 51 and the first positioning groove 52 are provided with matching guide portions 85 on both sides to guide the first positioning protrusion 51 into the first positioning groove 52. The guide portion 85 can be in the form of an angle, a rounded corner, or a guide cone surface.

[0037] With this configuration, after the upper shaft 6 and the lower shaft 7 are assembled, the first positioning protrusion 51 will slide into the first positioning groove 52, which reduces the assembly difficulty and helps to improve assembly efficiency.

[0038] like Figure 7As shown, to enhance connection strength, both the upper shaft 6 and the lower shaft 7 are provided with positioning ring grooves 86. The inner walls of the upper inner hole 83 and the lower inner hole 84 are provided with positioning protrusions 87 that are adapted to the positioning ring grooves 86. The upper shaft 6, the lower shaft 7, and the inner ball sleeve 3 are integrally injection molded. The positioning ring groove 86 can be a T-shaped cross-section annular protrusion or a dovetail groove-shaped cross-section annular protrusion, etc. During injection molding, the material of the inner ball sleeve 3 fills into the positioning ring groove 86, and after cooling, forms the positioning protrusions 87, constituting a strong mechanical interlocking structure, effectively preventing the upper shaft 6 and the lower shaft 7 from disengaging from the inner ball sleeve 3 under axial force.

[0039] In some embodiments, the inner ball sleeve 3 not only facilitates assembly but also forms a sealing structure at connection and welding points to prevent leakage. For example, the two ends of the inner ball sleeve 3 near the flow channel opening 101 abut against the ball shell 1 and the sleeve 2 to form a seal. This seal is a radial compression seal, utilizing the elastic deformation of the inner ball sleeve 3 to fill the microscopic gaps between the ball shell 1, the sleeve 2, and the support plate 4, thus forming an additional sealing barrier.

[0040] This application also provides a method for manufacturing a hollow sphere as described above. This method creatively utilizes the contraction and elastic recovery of elastic components to achieve damage-free assembly of complex internal support structures through narrow flow channels, including the following steps: S1: Several support plates 4, an upper shaft 6, and a lower shaft 7 are used as inserts and precisely pre-positioned in a molding die at a predetermined relative spatial position. The inner ball sleeve 3 is injection molded in the die, so that the molten elastic material covers the outer part of the support plate 4 and the corresponding parts of the upper shaft 6 and the lower shaft 7. After cooling, the support plate 4, upper shaft 6, lower shaft 7 and the inner ball sleeve 3 are integrally combined to form a whole elastic assembly.

[0041] S2: Apply a radially inward and uniformly distributed external force to the elastic assembly, for example by manual operation, a special clamp, or a shrink sleeve, forcing it to undergo elastic bending deformation and radially retract inward to a first form. In this first form, the maximum diameter of the outer contour of the elastic assembly is smaller than the inner diameter of the flow channel 101, thereby allowing it to be inserted unimpeded into the central cavity 100 of the spherical shell 1 through any of the flow channels 101.

[0042] S3: After the elastic assembly is fully placed in the central cavity 100, the applied external force is released. The elastic assembly expands radially outward under the elastic restoring force of the inner ball sleeve 3. During this expansion, the free end of the upper shaft 6 is guided to extend out of the upper outer hole 81, and the free end of the lower shaft 7 is guided to extend out of the lower outer hole 82, until the first positioning plate 41 on the outer side of each support plate 4 is in contact with the inner wall of the central cavity 100 of the spherical shell 1, completing the initial positioning. The upper shaft 6 and the lower shaft 7 can be fixed by tooling, especially when the support plate 4 is heavy.

[0043] S4: The sleeve 2 is pushed axially into any of the flow channels 101. The outer wall of the front end of the sleeve 2 first contacts the arc-shaped second positioning plate 42 on the inner side of each of the support plates 4, which is in an expanded state, and gradually pushes them apart, forcing each of the support plates 4 to further and evenly open radially outward, until the first positioning plate 41 on the outer side of each of the support plates 4 is tightly attached to the inner wall of the cavity 100, and the second positioning plate 42 on the inner side of each of the support plates 4 is tightly attached to the outer wall of the sleeve 2, forming a rigid support. In this process, the pushing force of the sleeve 2 is directly converted into the radial spreading force of the support plates 4.

[0044] S5: Continue to advance the sleeve 2 until both ends of the sleeve 2 are axially connected with the two flow channels 101 respectively, and the internal flow channels are completely connected.

[0045] S6: Insert a positioning fixture into the sleeve 2 to maintain the relative positional relationship between the components. Weld the two ends of the sleeve 2 to the flow channel 101 of the spherical shell 1, weld the upper shaft 6 to the upper outer hole 81, and weld the lower shaft 7 to the lower outer hole 82 to complete the manufacturing of the entire hollow sphere. The positioning fixture can be a mandrel that matches the inner diameter of the sleeve 2, and it can be removed after welding.

[0046] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0047] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0048] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A hollow sphere, comprising a shell and a sleeve, wherein the shell has a central cavity, and flow channels communicating with the central cavity are respectively provided at both ends of the shell; the sleeve is disposed within the central cavity, and both ends of the sleeve are respectively connected to the corresponding flow channels, characterized in that, It also includes an inner ball sleeve, which is made of elastic material and is spherical in its natural state, fitting the central cavity. When squeezed, it can undergo elastic deformation to pass through the flow channel and return to its spherical shape after entering the central cavity. Its outer wall fits against the inner wall of the central cavity, and several support plates are arranged circumferentially between its inner wall and the outer wall of the sleeve. The outer side of the support plate is connected to the inner ball sleeve, and its inner side abuts against the outer wall of the sleeve.

2. A hollow sphere according to claim 1, characterized in that, The outer side of the support plate is integrally injection molded with the inner ball sleeve.

3. A hollow sphere according to claim 2, characterized in that, A first positioning plate is provided on the outer side of the support plate. The first positioning plate is embedded in the inner ball sleeve and its shape is adapted to the inner wall of the cavity. The first positioning plate abuts against the inner wall of the cavity through the inner ball sleeve or directly against the inner wall of the cavity. A second positioning plate is provided on the inner side of the support plate. The second positioning plate abuts against the outer periphery of the sleeve and its shape is adapted to it.

4. A hollow sphere according to claim 3, characterized in that, The support plate is provided with a third positioning plate near the first positioning plate, and the first positioning plate and the third positioning plate form an I-shaped structure on the outside of the support plate.

5. A hollow sphere according to claim 4, characterized in that, The outer side wall of the first positioning plate and the inner wall of the spherical shell are provided with a first positioning protrusion on one side and a first positioning groove on the other side. The inner side wall of the second positioning plate and the outer wall of the sleeve are provided with a second positioning protrusion on one side and a second positioning groove on the other side.

6. A hollow sphere according to claim 5, characterized in that, It also includes an upper shaft and a lower shaft. The spherical shell is coaxially provided with an upper outer hole and a lower outer hole. The inner spherical sleeve is coaxially provided with an upper inner hole and a lower inner hole. The upper end of the upper shaft is welded and fixed to the upper outer hole, and its lower end abuts against the outer peripheral wall of the sleeve. The lower end of the lower shaft is welded to the lower outer hole, and its upper end abuts against the outer peripheral wall of the sleeve.

7. A hollow sphere according to claim 6, characterized in that, The first positioning protrusion and the first positioning groove are provided with matching guide parts on both sides to guide the first positioning protrusion to be embedded into the first positioning groove.

8. A hollow sphere according to claim 6, characterized in that, Both the upper and lower shafts are provided with positioning ring grooves, and the inner walls of the upper and lower inner holes are provided with positioning protrusions that are adapted to the positioning ring grooves. The upper shaft, lower shaft and inner ball sleeve are integrally injection molded.

9. A hollow sphere according to claim 6, characterized in that, The two ends of the inner ball sleeve near the flow channel opening abut against the ball shell and the sleeve to form a seal.

10. The method for manufacturing a hollow sphere as described in any one of claims 6 to 9, characterized in that, Includes the following steps: S1: Several support plates, an upper shaft and a lower shaft are pre-placed as inserts in a molding mold, and the inner ball sleeve is injection molded in the mold, so that the support plates, upper shaft, lower shaft and inner ball sleeve are integrally combined to form an elastic assembly assembly; S2: Apply an external force to the elastic assembly component to make it radially inward to a first form, in which the maximum diameter of the outer contour of the elastic assembly component is smaller than the inner diameter of the flow channel, and place it into the middle cavity of the spherical shell through any of the flow channels. S3: When the external force is released, the elastic assembly expands radially outward under the elastic restoring force of the inner ball sleeve, so that the free end of the upper shaft extends out from the upper outer hole and the free end of the lower shaft extends out from the lower outer hole, so that the first positioning plate on the outer side of each support plate fits against the inner wall of the middle cavity of the ball shell. S4: Push the sleeve axially from any of the flow channels, and the outer wall of the sleeve gradually pushes open each of the support plates in the expanded state, forcing each of the support plates to open further radially outward until the first positioning plate on the outer side of each support plate is tightly attached to the inner wall of the cavity, and the second positioning plate on the inner side of each support plate is tightly attached to the outer wall of the sleeve. S5: Continue to advance the sleeve until both ends of the sleeve are connected to the two flow channels respectively; S6: Install a positioning fixture inside the sleeve, weld and fix both ends of the sleeve to the flow channel of the spherical shell, weld and fix the upper shaft to the upper outer hole, and weld and fix the lower shaft to the lower outer hole.

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