Three-way ball valve

Abstract

The utility model relates to the technical field of valves, and provides a three-way ball valve which comprises a valve body, and a horizontal channel and a vertical channel which communicate with each other are formed in the valve body; the ball core is rotatably positioned at the joint of the horizontal channel and the vertical channel and is provided with an L-shaped channel communicated with the horizontal channel and the vertical channel; a rotatable inner pipe assembly is arranged in the valve body; the rotatable inner pipe assembly comprises an inner pipe arranged in the horizontal channel in a radial clearance fit mode; the sealing structure is arranged in a gap between the fluid inlet end of the valve body and the inner pipe; the rotating operation structure is used for rotating the inner pipe relative to the valve body; the limiting structure is used for limiting displacement of the inner pipe in the axial direction of the horizontal channel. According to the three-way ball valve, sediments can be reduced by rotating the inner pipe, maintenance is facilitated by combining the detachable design, and the technical problems that a traditional three-way ball valve is serious in sediment accumulation and difficult to clean are effectively solved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a three-way ball valve. Background Technology

[0002] Three-way ball valves are important fluid control devices widely used in petrochemical, energy transmission, and water supply and drainage systems. Traditional three-way ball valves typically consist of a valve body, a ball core, and sealing components. The rotation of the ball core enables the switching or merging / diverting of fluid channels. In conventional designs, the ball core has an L-shaped or T-shaped channel, and the fluid flow direction is controlled by the 90° rotation of the ball core.

[0003] However, in practical applications, these valves operate in environments with fluid media (especially those containing particles, impurities, or corrosive components) for extended periods, presenting the following technical challenges:

[0004] 1. Deposits buildup: When the fluid flow rate is low or the medium viscosity is high, solid particles and deposits tend to accumulate at the bottom of the valve body channel. Because the inner wall of a traditional ball valve channel is a fixed structure, deposits adhering to the lower side of the channel for a long time are difficult to remove. This not only reduces the effective flow diameter but may also cause localized corrosion, severely affecting the valve's sealing performance and service life.

[0005] 2. Difficulty in cleaning and maintenance: Current technologies for solving deposition problems typically require shutting down the system, disassembling valves for manual cleaning, or relying on the addition of external flushing devices. The former leads to system downtime and high maintenance costs, while the latter increases equipment complexity and is difficult to implement in confined spaces or under high pressure conditions.

[0006] To address the aforementioned issues, the industry urgently needs a three-way ball valve solution that can actively remove deposits without disassembling the valve, while maintaining a compact structure and ease of operation. Utility Model Content

[0007] This application provides a three-way ball valve that can improve the technical problems of deposit accumulation and difficult cleaning and maintenance of three-way ball valves in related technologies.

[0008] In a first aspect, embodiments of this application provide a three-way ball valve, comprising: a valve body having an internally interconnected horizontal channel and a vertical channel; a ball core rotatably located at the junction of the horizontal and vertical channels and having an L-shaped channel for communicating with the horizontal and vertical channels; the valve body having a rotatable inner tube assembly; the rotatable inner tube assembly comprising: an inner tube disposed within the horizontal channel via a radial clearance fit; a sealing structure disposed in the gap between the fluid inlet end of the valve body and the inner tube; a rotation operation structure for rotating the inner tube relative to the valve body; and a limiting structure for limiting the displacement of the inner tube along the axial direction of the horizontal channel.

[0009] The technical solutions described in this application embodiment have at least the following technical effects: When the fluid flow rate is low or the medium viscosity is high, solid particles and sediments tend to deposit at the bottom of the inner tube channel. At this time, by rotating the inner tube with the operating component, the solid particles and sediments at the bottom will come to the top. Under the action of gravity, combined with the flushing effect of the fluid in the flow channel, they are more likely to detach and flow out with the fluid. At the same time, when cleaning is required, simply disconnect the connecting pipe, remove the operating component and the limiting structure, and the inner tube can be taken out from the horizontal channel for easy cleaning.

[0010] In some embodiments, the sealing structure includes a sealing groove disposed on the inner wall of the valve body and a lip seal disposed on the sealing groove, wherein the lip seal portion of the lip seal fits against the outer wall of the inner tube.

[0011] In some embodiments, the lip seal includes a sealing body, the lip seal portion is disposed on the side of the sealing body near the inner tube and has a main sealing lip and a secondary sealing lip, a V-shaped grease reservoir is formed between the main sealing lip and the secondary sealing lip, and the V-shaped grease reservoir is filled with grease; a metal skeleton is embedded in the sealing body; and an elastic hollow metal ring is embedded on the outer periphery of the main sealing lip.

[0012] In some embodiments, the sealing body is L-shaped, the lip seal is connected to the inner circumference of the sealing body and forms a cavity with the sealing body, the cavity is located near the end of the inner tube, the metal skeleton is an L-shaped annular metal part, the metal skeleton is embedded in the inner wall of the sealing body near the cavity; the main sealing lip is located near the end of the secondary sealing lip near the inner tube; a second retaining ring is provided between the lip seal and the inner wall of the sealing groove of the valve body, the second retaining ring is located relative to the end of the lip seal away from the inner tube.

[0013] In some embodiments, the rotary operating structure includes a radial slot on the valve body, a connecting portion on the outer wall of the inner tube, and an operating member connected to the connecting portion, the operating member passing through the radial slot.

[0014] In some embodiments, the operating element includes an operating rod, an operating head, and an operating connection end connected in sequence. The operating rod is disposed in a radially slotted groove with a clearance fit between its surface and the groove walls on both sides. The operating head is disposed outside the valve body. The operating connection end is detachably connected to the connection portion of the inner tube outer wall.

[0015] In some embodiments, the radial slot of the valve body is provided with rounded corners at both ends, and the two ends of the radial slot and the side slot walls form a range restriction area, restricting the movement of the operating rod within the range restriction area.

[0016] In some embodiments, the limiting structure includes a first limiting fit structure formed by a first annular protrusion disposed on the inner wall of the valve body and the end of the inner tube near the ball core, a second limiting fit structure formed by a first retaining ring detachably connected to the inner wall of the valve body and the end of the inner tube away from the ball core, and a third limiting fit structure formed by a second annular protrusion disposed on the outer wall of the inner tube away from the ball core and an annular groove on the inner wall of the valve body away from the ball core; the first and third limiting fit structures together restrict axial and radial displacement, and the second limiting fit structure suppresses axial displacement.

[0017] In some embodiments, the first annular protrusion is an L-shaped annular structure, and an annular gap space is formed between the L-shaped annular structure and the inner wall of the valve body. The annular gap space allows the inner tube to be nested in and restricts the uniaxial displacement of the inner tube towards the ball core.

[0018] In some embodiments, the second annular protrusion includes a first mating surface and a second mating surface. The first mating surface is located on the outer periphery of the second annular protrusion, and the second mating surface is located at one end of the second annular protrusion near the ball core. The second mating surface is a conical surface, and the bottom surface of the annular groove of the valve body is a conical surface adapted to the second mating surface. The second mating surface fits the bottom surface of the annular groove of the valve body.

[0019] The beneficial effects of this application embodiment are specifically reflected in the following aspects: 1. Active anti-deposition: Through the rotatable inner tube, without disassembling the valve, the inner tube can be rotated online by simply controlling the operating component, which turns the deposits at the bottom of the pipe to the top, so that the deposits can be washed out with the fluid under the action of gravity, thereby improving the deposition problem on the inner wall of the pipe and reducing the frequency of valve disassembly and cleaning, providing a solution to the problem of deposit accumulation in traditional ball valves; 2. Quick maintenance: The detachable inner tube design transforms traditional valve body cleaning into inner tube cleaning, improving cleaning efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of section B in the middle;

[0024] Figure 4 for Figure 1 Enlarged view of part C in the middle;

[0025] Figure 5 This is a schematic diagram of the operating component of this utility model;

[0026] Figure 6 This is an assembly diagram of the present invention;

[0027] The following are the labeling elements in the figure:

[0028] 1-Valve body, 2-Horizontal channel, 3-Spherical core, 4-Inner tube, 5-Sealing structure, 50-Main lip, 51-Secondary lip, 52-Metal skeleton, 53-Elastic hollow metal ring, 54-Second retaining ring, 55-V-shaped grease reservoir, 6-Rotary operating structure, 60-Operating component, 601-Operating lever, 602-Operating head, 603-Operating connection end, 61-Radial slot, 62-Connecting part, 7-First annular protrusion, 8-Second annular protrusion, 9-First retaining ring. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "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.

[0033] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0035] It should be noted that in this application, the words "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 design solutions. Specifically, the use of words 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 the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is 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.

[0036] Three-way ball valves are important fluid control devices widely used in petrochemical, energy transmission, and water supply and drainage systems. Traditional three-way ball valves typically consist of a valve body, a ball core, and sealing components. The rotation of the ball core enables the switching or merging / diverting of fluid channels. In conventional designs, the ball core has an L-shaped or T-shaped channel, and the fluid flow direction is controlled by the 90° rotation of the ball core.

[0037] Based on this, in order to improve the technical problems of deposit accumulation and difficult cleaning and maintenance of three-way ball valves in related technologies, the embodiments of this application provide the following solutions.

[0038] Please refer to the following: Figure 1 and Figure 5 This application provides a three-way ball valve including a valve body 1, which internally forms a horizontal channel 2 and a vertical channel that are interconnected; a ball core 3, rotatably located at the connection between the horizontal channel 2 and the vertical channel, and provided with an L-shaped channel for communicating with the horizontal channel 2 and the vertical channel; a rotatable inner tube assembly is provided inside the valve body 1; the rotatable inner tube assembly includes: an inner tube 4, which is radially clearance fitted inside the horizontal channel 2; a sealing structure 5, which is disposed in the gap between the fluid inlet end of the valve body 1 and the inner tube 4; a rotation operation structure for rotating the inner tube 4 relative to the valve body 1; and a limiting structure for limiting the displacement of the inner tube 4 along the axial direction of the horizontal channel 2.

[0039] In the initial state, the fluid enters from the inlet and flows straight through the horizontal channel 2. However, when the fluid velocity is low or the medium viscosity is high, solid particles and sediments tend to settle at the bottom of the valve body channel, forming deposits over time. In the working state, the inner tube 4 is placed into the horizontal channel 2. When the fluid enters from the inlet, it directly enters the inner tube 4 channel, and solid particles and sediments tend to settle at the bottom of the inner tube 4. When the inner tube 4 rotates, newly settled particles at the bottom will move to the upper end of the channel. Under the influence of gravity and the flushing effect of the fluid within the channel, they are more easily removed and flow out with the fluid. When it is necessary to disassemble the inner tube 4, simply disconnect the connecting pipe, rotate the operating part 60 in the opposite direction to separate it from the inner tube 4, and then remove the retaining ring. The inner tube 4 can then be pulled out of the valve body fluid channel for replacement or cleaning, making maintenance convenient.

[0040] As can be seen from the above, the three-way ball valve provided in this application embodiment can improve the deposition problem on the inner wall of the pipeline by controlling the operating component 60 without disassembling the valve through the rotatable inner tube, providing a solution to the problem of deposit accumulation in traditional ball valves; the detachable inner tube design transforms the traditional valve body cleaning into an inner tube cleaning component, which shortens the maintenance time compared to traditional valves.

[0041] In some embodiments, please refer to the following: Figure 1 and Figure 4 The sealing structure 5 includes a sealing groove provided on the inner wall of the valve body 1 and a lip seal provided on the sealing groove, wherein the lip seal portion of the lip seal fits against the outer wall of the inner tube 4.

[0042] Compared to ordinary sealing rings, lip seals have a smaller contact area between the flexible lip and the shaft, resulting in lower friction and heat generation, making them more suitable for environments where the sealing surfaces rotate relative to each other.

[0043] In some embodiments, please refer to the following: Figures 1 to 4 The lip seal includes a sealing body, which is L-shaped. A lip sealing part is provided on the side near the inner tube 4. The lip sealing part includes a main sealing lip 50 and a secondary sealing lip 51. A V-shaped grease reservoir 55 is formed between the main sealing lip 50 and the secondary sealing lip 51. The V-shaped grease reservoir 55 is filled with grease.

[0044] A metal skeleton 52 is embedded within the sealing body. The metal skeleton 52 is an L-shaped annular metal part embedded in the inner wall of the sealing body near the cavity to enhance the structural strength of the seal and prevent deformation under pressure. An elastic hollow metal ring 53 is embedded on the outer periphery of the main sealing lip 50 to provide continuous radial elastic force and compensate for wear of the sealing lip or axial eccentricity.

[0045] The lip seal is connected to the inner circumference of the sealing body, forming a cavity with the sealing body. The cavity is located near the end of the inner tube 4. A second retaining ring 54 is installed on the low-pressure side of the lip seal. The second retaining ring 54 is located outside the secondary sealing lip 51 and acts as a rigid support to prevent the medium pressure from acting directly on the back of the sealing lip, thus avoiding reverse pressure deformation of the lip. The second retaining ring 54 cooperates with the first retaining ring 9 to jointly restrict the axial movement of the inner tube 4.

[0046] When water flows in, it enters the lip of the lip seal, causing the main sealing lip 50 and the secondary sealing lip 51 to fit tightly against the outer wall of the inner pipe 4 under water pressure, thus achieving a dynamic rotary seal. Wherein:

[0047] The main sealing lip 50 performs the main sealing function, directly contacting the sealed medium to ensure the sealing effect under high pressure differential.

[0048] The secondary sealing lip 51 serves as a redundant sealing barrier to prevent media leakage when the main sealing lip fails, and to block external contaminants from entering, thereby improving sealing reliability.

[0049] The grease in the V-shaped grease reservoir 55 continuously lubricates the contact surfaces of the main and secondary sealing lips, reducing frictional torque and preventing lip burning caused by dry friction.

[0050] The metal skeleton 52 enhances the overall rigidity of the seal, preventing deformation during installation or under high pressure conditions, while ensuring a tight fit between the seal and the shaft or housing;

[0051] The elastic hollow metal ring 53 maintains the contact pressure between the main sealing lip 50 and the inner tube 4 through elastic force, and dynamically adjusts when the shaft slightly vibrates or wears, thus avoiding leakage; the hollow metal ring has space for elastic compensation compared to the solid one.

[0052] Optionally, please refer to Figure 2 and Figure 6The rotary operating structure includes a radial slot 61 formed on the outer wall of the valve body 1, a connecting part 62 fixed to the outer wall of the inner tube 4, and an operating member 60 connected to the connecting part, with the operating member passing through the radial slot 61.

[0053] The radial slot 61 of the valve body has rounded corners at both ends. The two ends of the radial slot (61) and the two side walls of the slot form a range restriction zone, and the operating rod is restricted to move within the range restriction zone. The movement angle can be 0°-180°. This setting can reduce the friction between the slot wall and the operating part 60. At the same time, the 180° rotation can remove as much sediment as possible from the bottom of the inner tube without having too much negative impact on the structural strength of the valve body.

[0054] Optionally, please refer to Figure 1 and Figure 6 The operating component 60 includes an operating rod 601, an operating head 602, and an operating connection end 603 connected in sequence. The operating rod 601 is disposed in the groove of the radial slot 61 and the surface is clearance-fitted with the groove walls on both sides. The operating head 602 is disposed outside the valve body 1. The operating connection end 603 is detachably connected to the connection part 62 of the outer wall of the inner tube 4.

[0055] The length of the operating rod 601 extending out of the valve body satisfies good rotational interaction, and the gap between the operating rod 601 and the radial slot 61 is 0.1-0.5mm, ensuring smooth rotation and avoiding particle jamming; the operating head 602 makes smooth contact with the hand; the connection method between the operating connection end 603 and the connection part 62 of the outer wall of the inner tube 4 can be a threaded connection or a fixing pin, etc.

[0056] When using a threaded connection, the operating part 60 is rotated into the inner tube wall to a certain depth, which does not exceed half the depth of the inner tube wall. When disassembling, simply rotate the operating part 60 in the opposite direction three times to separate the operating part 60 from the connection part 62 on the outer wall of the inner tube 4. When the operating part 60 is removed, disconnect the pipe connected to the valve and remove the first retaining ring 9 at the same time. At this time, the inner tube 4 can be taken out from the horizontal channel 2 without obstruction, which facilitates the subsequent cleaning of the inner tube 4.

[0057] Optionally, please refer to Figures 1 to 3 The limiting structure of the three-way ball valve includes the following technical features: A first annular protrusion 7 is provided on the inner wall of the valve body 1. The first annular protrusion 7 and the end face of the inner tube 4 near the ball core 3 form a first limiting fit structure, used to limit the axial displacement of the inner tube 4 towards the ball core 3. The first annular protrusion 7 is an L-shaped annular structure, forming an annular gap space between it and the inner wall of the valve body 1. This annular gap space is used to accommodate the end of the inner tube 4.

[0058] The outer wall of the inner tube 4 is provided with a second annular protrusion 8 at one end away from the ball core 3. The second annular protrusion 8 includes a first mating surface located on the outer periphery and a second mating surface located near the ball core 3. The second mating surface is a conical surface, which is adapted to the conical bottom surface of the annular groove at the corresponding position on the inner wall of the valve body 1 to form a third limiting mating structure, which is used to constrain the axial movement of the inner tube 4 and suppress radial displacement.

[0059] The inner wall of the valve body 1 is also provided with a detachable first retaining ring 9. The first retaining ring 9 is an open shaft retaining ring. After being compressed by snap ring clamps, it is placed into the annular groove in the inner wall of the valve body 1 for elastic reset and fixation, forming a second limiting fit structure with the end face of the inner tube 4 away from the ball core 3.

[0060] During installation, the assembly process of pushing the inner tube 4 axially into the valve body 1 along the horizontal channel 2 is as follows: First, the end of the inner tube 4 near the ball core 3 is inserted into the annular gap space formed by the first annular protrusion 7, so that the end face of the inner tube 4 contacts the vertical end face of the L-shaped structure; then, the conical surface of the second annular protrusion 8 is tightly fitted with the conical bottom surface of the annular groove of the valve body 1; finally, the first retaining ring 9 is inserted into the slot in the inner wall of the valve body 1, so that the first retaining ring 9 abuts against the end face of the inner tube 4 away from the ball core 3.

[0061] Through the coordinated operation of the above triple limiting structure, the valve structure is kept compact while the inner tube 4 is precisely positioned in the axial and radial directions. This effectively improves the stability and sealing reliability of the valve under high pressure, vibration and frequent opening and closing conditions, and facilitates maintenance and disassembly.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A three-way ball valve, characterized in that, include: The valve body (1) has an internally interconnected horizontal channel (2) and a vertical channel; The ball core (3) is rotatably located at the connection between the horizontal channel (2) and the vertical channel, and is provided with an L-shaped channel for communicating with the horizontal channel (2) and the vertical channel; The valve body (1) is provided with a rotatable inner tube assembly; The rotatable inner tube assembly includes: The inner tube (4) is installed in the horizontal channel (2) through a radial clearance fit; A sealing structure (5) is provided in the gap between the fluid inlet end of the valve body (1) and the inner tube (4); The rotary operating structure (6) is used to rotate the inner tube (4) relative to the valve body (1); The limiting structure is used to limit the displacement of the inner tube (4) along the axial direction of the horizontal channel (2).

2. The three-way ball valve according to claim 1, characterized in that: The sealing structure (5) includes a sealing groove provided on the inner wall of the valve body (1) and a lip seal provided on the sealing groove, wherein the lip seal portion of the lip seal fits against the outer wall of the inner tube (4).

3. The three-way ball valve according to claim 2, characterized in that: The lip seal includes a sealing body, and the lip seal is located on the side of the sealing body near the inner tube (4) and is provided with a main sealing lip (50) and a secondary sealing lip (51). A V-shaped grease reservoir (55) is formed between the main sealing lip (50) and the secondary sealing lip (51), and the V-shaped grease reservoir (55) is filled with grease. A metal skeleton (52) is embedded in the sealing body. An elastic hollow metal ring (53) is embedded at the root of the main sealing lip (50).

4. The three-way ball valve according to claim 3, characterized in that: The sealing body is L-shaped. The lip seal is connected to the inner circumference of the sealing body and forms a cavity with the sealing body. The cavity is located near the end of the inner tube (4). The metal skeleton (52) is an L-shaped annular metal piece. The metal skeleton (52) is embedded in the inner wall of the sealing body near the cavity. The main sealing lip (50) is located near the end of the inner tube (4) relative to the secondary sealing lip (51). A second retaining ring (54) is provided between the lip seal and the inner wall of the sealing groove of the valve body (1). The second retaining ring (54) is located relative to the end of the lip seal away from the inner tube (4).

5. The three-way ball valve according to claim 1, characterized in that: The rotary operating structure (6) includes a radial slot (61) on the valve body (1), a connecting part (62) on the outer wall of the inner tube, and an operating member (60) connected to the connecting part, the operating member passing through the radial slot (61).

6. The three-way ball valve according to claim 5, characterized in that: The operating component (60) includes an operating rod (601), an operating head (602), and an operating connection end (603) connected in sequence. The operating rod is set in the groove of the radial slot (61) and the surface is in clearance fit with the groove walls on both sides. The operating head is set outside the valve body (1). The operating connection end (603) is detachably connected to the connection part (62) of the outer wall of the inner tube (4).

7. The three-way ball valve according to claim 5, characterized in that: The radial slot (61) of the valve body (1) has rounded corners at both ends. The two ends of the radial slot (61) and the side walls of the slot form a range restriction area, and the operating rod is restricted to move within the range restriction area.

8. The three-way ball valve according to claim 1, characterized in that: The limiting structure includes a first limiting fit structure formed by a first annular protrusion (7) on the inner wall of the valve body (1) and the end of the inner tube (4) near the ball core (3); a second limiting fit structure formed by a first retaining ring (9) detachably connected to the inner wall of the valve body (1) and the end of the inner tube (4) away from the ball core (3); and a third limiting fit structure formed by a second annular protrusion (8) on the outer wall of the inner tube (4) away from the direction of the ball core (3) and an annular groove on the inner wall of the valve body (1) away from the direction of the ball core (3). The first and third limiting fit structures together restrict axial and radial displacement, and the second limiting fit structure suppresses axial displacement.

9. The three-way ball valve according to claim 8, characterized in that: The first annular protrusion (7) is an L-shaped annular structure. The L-shaped annular structure and the inner wall of the valve body (1) form an annular gap space. The annular gap space allows the inner tube to be nested in and restricts the uniaxial displacement of the inner tube (4) towards the ball core (3).

10. The three-way ball valve according to claim 8, characterized in that: The second annular protrusion (8) includes a first mating surface and a second mating surface. The first mating surface is located on the outer periphery of the second annular protrusion (8), and the second mating surface is located at one end of the second annular protrusion (8) near the ball core (3). The second mating surface is a conical surface. The bottom surface of the annular groove of the valve body (1) is a conical surface that matches the second mating surface. The second mating surface fits the bottom surface of the annular groove of the valve body (1).

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