Medical three-way valve capable of preventing mistaken rotation

Abstract

The medical three-way valve comprises a valve body, a cylindrical valve element and a handle, the valve body is provided with a containing cavity used for containing the cylindrical valve element, and the cylindrical valve element is connected with the handle. The cylindrical valve element is driven to rotate in the containing cavity by rotating the handle, so that the internal channel communicates with any two external channels, and meanwhile the cylindrical valve element seals the remaining external channels. A first locking structure is arranged at the bottom of the containing cavity, a second locking structure is arranged on the cylindrical valve element, and the cylindrical valve element is driven by pressing the handle to move towards the first locking structure so that the second locking structure and the first locking structure can be locked in an engaged mode. The first locking structure is unlocked according to the principle that the handle is lifted to drive the cylindrical valve element. According to the three-way valve, forced locking of the passage state of the three-way valve is achieved in a mechanical interlocking mode, a locking structure is integrated in the valve body, an external dismounting part is not needed, the sealing performance of a pipeline system can be maintained (blood leakage or air entering is avoided), and the sterile requirement of a treatment scene can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a medical three-way valve with anti-rotation function. BACKGROUND

[0002] The medical three-way valve is an indispensable pipe connecting device in extracorporeal circulation support equipment (such as ECMO, CRRT) and intensive care treatment, which can realize the multi-directional flow control of blood, liquid medicine or replacement fluid by rotating the handle to adjust the conduction direction of the passage in the cylindrical valve core. In ECMO, CRRT treatment and ICU complex infusion scenarios, the three-way valve is often connected in series with the blood inlet pipe to support clinical operations, such as blood sampling monitoring, pipe flushing or connecting other treatment equipment. Since the operation of such equipment directly affects the vital signs of the patient, the operation accuracy and reliability of the three-way valve are directly related to the safety and continuity of the treatment.

[0003] However, the existing medical three-way valve generally adopts an open rotating structure, and in clinical practice, the handle is easy to be accidentally rotated due to the touching of medical staff, the vibration caused by equipment movement or the winding of the pipe, which leads to the abnormal opening and closing state of the three-way valve pipe. Such misoperation may cause serious complications such as blood reflux, gas embolism or coagulation pipe blockage, forcing the treatment to be interrupted and increasing the risk of secondary machine operation. CONTENT OF THE INVENTION

[0004] The present application provides a medical three-way valve with anti-rotation function to solve the technical problem that the existing medical three-way valve generally adopts an open rotating structure, and the handle is easy to be accidentally rotated.

[0005] The present application provides a medical three-way valve with anti-rotation function, which comprises a valve body, a cylindrical valve core, a handle, and an interlocking structure.

[0006] The valve body has a receiving cavity, which accommodates the cylindrical valve core, and the cylindrical valve core is connected with the handle.

[0007] The valve body is provided with three external passages, which are located at different positions of the valve body, the external passages penetrate through the valve body, and the inner end of the external passage is in communication with the receiving cavity, and the outer end of the external passage is communicated to the outside of the valve body. The cylindrical valve core is provided with an internal passage, which penetrates through the cylindrical valve core, and the handle rotates to drive the cylindrical valve core to rotate in the receiving cavity, so that the internal passage communicates with any two external passages, and the cylindrical valve core closes the remaining external passages.

[0008] The interlocking structure comprises a first locking structure arranged at the bottom of the accommodating cavity and a second locking structure arranged on the cylindrical valve core. The interlocking structure is configured to move the cylindrical valve core to the first locking structure by pressing the handle to enable the second locking structure to engage and lock with the first locking structure, and to move the cylindrical valve core away from the first locking structure by pulling the handle to enable the second locking structure to disengage from the first locking structure.

[0009] In a possible design, the first locking structure is an anti-rotation boss, the second locking structure has an embracing space matched with the anti-rotation boss, and the interlocking structure is configured to enable the second locking structure to embrace and clamp the outer wall of the anti-rotation boss after the cylindrical valve core moves the second locking structure to the anti-rotation boss to enable the anti-rotation boss to be clamped in the embracing space, so as to enable the second locking structure to engage and lock with the first locking structure.

[0010] In a possible design, the second locking structure is a plurality of flaky buckles, and the inner side walls of the plurality of flaky buckles form the embracing space.

[0011] In a possible design, the second locking structure is a ring-shaped piece, and the inner cavity of the ring-shaped piece forms the embracing space.

[0012] In a possible design, the first locking structure is an annular groove, and the second locking structure is a plurality of buckling tongues, and the groove body of the annular groove is matched with the buckling tongues.

[0013] The interlocking structure is configured to enable the plurality of buckling tongues to be inserted into the groove body of the annular groove after the cylindrical valve core moves the plurality of buckling tongues to the annular groove, so as to enable the second locking structure to engage and lock with the first locking structure.

[0014] In a possible design, the two opposite inner side walls of the groove body are guide inclined surfaces, and one end of the buckling tongue is a wedge-shaped head, and the outer wall of the wedge-shaped head is matched with the guide inclined surfaces, so as to enable the second locking structure to engage and lock with the first locking structure after the plurality of buckling tongues are inserted into the groove body of the annular groove.

[0015] In a possible design, the first locking structure is a conical cavity, the cavity body of the conical cavity is conical, and the second locking structure is a conical protrusion matched with the conical cavity.

[0016] The interlocking structure is configured to enable the conical protrusion to be inserted into the cavity body of the conical cavity after the cylindrical valve core moves the conical protrusion to the conical cavity, so as to enable the second locking structure to engage and lock with the first locking structure.

[0017] In one possible design, the inner wall of the conical cavity has a silicone layer. After the conical protrusion is inserted into the cavity, the silicone layer abuts against the outer wall of the conical protrusion. The silicone layer and the outer wall of the conical protrusion engage and lock the second locking structure with the first locking structure through friction.

[0018] In one possible design, the sidewall of the cylindrical valve core has anti-slip textures that abut against the inner wall of the receiving cavity.

[0019] In one possible design, the internal passage includes at least two branch passages, and the internal passage is configured such that when the two branch passages connect the inner ends of the two external passages, the sidewall of the cylindrical valve core closes the inner end of the other external passage.

[0020] The anti-misoperation medical three-way valve provided in this application embodiment has the following technical effects:

[0021] Because the three-way valve has a first locking structure at the bottom of the receiving cavity and a matching second locking structure on the cylindrical valve core, when medical personnel press the handle, the cylindrical valve core moves axially to engage the second locking structure with the first locking structure. This mechanical interlock completely restricts the rotation of the cylindrical valve core, achieving forced locking of the three-way valve's passage state and completely preventing accidental passage switching due to accidental touch or rubbing. When passage adjustment is required, pulling the handle moves the cylindrical valve core upward, disengaging the second locking structure from the first locking structure and restoring the cylindrical valve core's rotational freedom to achieve passage switching. Therefore, while ensuring ease of operation, the device separates the rotational and locking functions through a mechanical interlock mechanism, significantly improving operational safety in high-risk medical scenarios. Furthermore, since the locking structure is integrated inside the valve body and requires no external disassembly parts, it maintains the sealing of the pipeline system (preventing blood leakage or air ingress) and meets the aseptic requirements of treatment scenarios such as ECMO and CRRT. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] Figure 1 Schematic diagram of the anti-misoperation medical three-way valve provided in the embodiments of this application Figure 1 ;

[0024] Figure 2 Schematic diagram of the anti-misoperation medical three-way valve provided in the embodiments of this application Figure 2 ;

[0025] Figure 3Structure diagram of the anti-misrotation medical three-way valve provided by the embodiment of the present application Figure 3 ;

[0026] Figure 4 Structure diagram of the anti-misrotation medical three-way valve provided by the embodiment of the present application Figure 4 ;

[0027] Figure 5 Structure diagram of the anti-slip pattern provided by the embodiment of the present application

[0028] Reference signs:

[0029] 100 - valve body

[0030] 110 - accommodating cavity

[0031] 120 - external passage

[0032] 200 - cylindrical valve core

[0033] 210 - internal passage

[0034] 220 - anti-slip pattern

[0035] 300 - handle

[0036] 400 - interlocking structure

[0037] 410 - first locking structure

[0038] 420 - second locking structure

[0039] 421 - embracing space

[0040] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The same numbers are used in different drawings to represent the same or similar elements. The embodiments described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] The existing medical three-way valve generally adopts an open rotary structure. In clinical practice, the handle is easily rotated accidentally due to the body touch of medical staff, equipment movement vibration or pipeline winding, which leads to the abnormal opening and closing state of the three-way valve pipeline. The inventor conceives that if a locking structure easy to operate is designed to fix the valve core so that it cannot be rotated, the problem of abnormal opening and closing state of the pipeline caused by accidental rotation of the handle can be avoided.

[0043] Therefore, in view of the above problems, the technical concept of the present application is to design a medical three-way valve. The three-way valve comprises a valve body, a cylindrical valve core and a handle. The valve body has a receiving cavity for accommodating the cylindrical valve core. The cylindrical valve core is connected with the handle. The valve body is provided with three external passages located at different positions. The external passage penetrates the valve body, and one end of the external passage is communicated with the receiving cavity, and the other end is communicated to the outside of the valve body. The cylindrical valve core is provided with an internal passage penetrating the cylindrical valve core. The internal passage is communicated with any two external passages while the cylindrical valve core closes the remaining external passage by rotating the handle to drive the cylindrical valve core to rotate in the receiving cavity. The bottom of the receiving cavity is provided with a first locking structure, and the cylindrical valve core is provided with a second locking structure. The second locking structure is engaged and locked with the first locking structure by pressing the handle to drive the cylindrical valve core to move towards the first locking structure. The handle is pulled to drive the cylindrical valve core away from the first locking structure to achieve unlocking.

[0044] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes may not be described again in some examples. The embodiments of the present application will be described below with reference to the drawings.

[0045] Embodiment one

[0046] Figure 1 The anti-misrotation medical three-way valve structure shown in the embodiment of the present application Figure 1 , Figure 1 The longitudinal section view of the valve body is shown in Figure 1 The three-way valve comprises a valve body, a cylindrical valve core, a handle and an interlocking structure.

[0047] The valve body has a receiving cavity for accommodating the cylindrical valve core, and the cylindrical valve core is connected with the handle.

[0048] The interlocking structure comprises a first locking structure arranged at the bottom of the receiving cavity and a second locking structure arranged on the cylindrical valve core. The interlocking structure is configured to engage and lock the second locking structure with the first locking structure by pressing the handle to drive the cylindrical valve core to move towards the first locking structure, and to disengage the second locking structure from the first locking structure by pulling the handle to drive the cylindrical valve core away from the first locking structure.

[0049] Specifically, since the accommodating cavity 110 of the valve body 100 is provided with the first locking structure 410, and the cylindrical valve core 200 is integrated with the second locking structure 420, when the operator presses the handle 300, the cylindrical valve core 200 moves along its axial direction to make the second locking structure 420 engage with the first locking structure 410 to limit the rotation of the cylindrical valve core 200; conversely, when the handle 300 is pulled, the cylindrical valve core 200 moves away from the first locking structure 410, and the second locking structure 420 is disengaged, so that the cylindrical valve core 200 can rotate freely in the accommodating cavity 110 to switch the communication state of the external passage 120. A silica gel sealing ring (not shown in the figure) can be arranged between the bottom of the cylindrical valve core 200 and the accommodating cavity 110, so as to meet the sealing standard of the medical connector.

[0050] As shown in Figure 1 Optionally, the first locking structure 410 can be an anti-rotation boss, and the second locking structure 420 can have a holding space 421, the holding space 421 cooperates with the anti-rotation boss, and the interlocking structure 400 is configured such that, after the cylindrical valve core 200 drives the second locking structure 420 to move to the anti-rotation boss and the anti-rotation boss is clamped into the holding space 421, the second locking structure 420 clamps and tightens the outer wall of the anti-rotation boss, so as to make the second locking structure 420 engage with the first locking structure 410.

[0051] It should be noted that the interlocking structure 400 is locked by the interference fit of the holding space 421 and the anti-rotation boss: since the second locking structure 420 at the bottom of the cylindrical valve core 200 is provided with the holding space 421, and the first locking structure 410 at the bottom of the accommodating cavity 110 is the anti-rotation boss, when the handle 300 is pressed, the cylindrical valve core 200 drives the second locking structure 420 to move to the anti-rotation boss, and after the anti-rotation boss is clamped into the holding space 421, the inner wall of the second locking structure 420 clamps and tightens the outer wall of the anti-rotation boss, so as to realize the engagement locking through the friction and structural interference. In a specific implementation manner, the anti-rotation boss can be a cubic block or a cylindrical block, and the second locking structure 420 can be a plurality of sheet-shaped buckles, as shown in Figure 2As shown, multiple sheet-like clips can be integrally molded with the cylindrical valve core 200 through injection molding. Their inner walls enclose a retaining space 421. The root thickness of the sheet-like clips can be designed as a gradient structure to enhance elastic deformation capability. Alternatively, the second locking structure 420 can also be a ring-shaped component, fixed to the bottom of the cylindrical valve core 200 by stamping or hot-melt processes. Its inner cavity is machined to form the retaining space 421. The material of the ring-shaped component can be, for example, a low-cost engineering plastic suitable for mass production. When the anti-rotation boss engages with the retaining space 421, the sheet-like clips or ring-shaped component undergo elastic deformation under radial compression. After resetting, they form an interference fit with the outer wall of the anti-rotation boss for locking. Both the sheet-like clips and the ring-shaped component can be quickly produced using standardized molds, significantly reducing parts processing costs.

[0052] Figure 2 Schematic diagram of the anti-misoperation medical three-way valve provided in the embodiments of this application Figure 2 ,like Figure 3 As shown, the valve body 100 is provided with three external passages 120, which are located at different positions on the valve body 100. The external passages 120 penetrate the valve body 100, and the inner end of the external passages 120 is connected to the receiving cavity 110, while the outer end of the external passages 120 is connected to the outside of the valve body 100. The cylindrical valve core 200 is provided with an internal passage 210, which penetrates the cylindrical valve core 200. The cylindrical valve core 200 is used so that the handle 300 rotates to drive the cylindrical valve core 200 to rotate within the receiving cavity 110, so that the internal passage 210 connects any two external passages 120, while simultaneously closing the remaining external passages 120.

[0053] Optionally, the internal passage 210 may include at least two branch passages, configured such that when the two branch passages connect to the inner ends of the two external passages 120, the sidewall of the cylindrical valve core 200 closes the inner end of the other external passage 120. For example... Figure 3 As shown, two branch paths can form an L-shape, and three branch paths can form a T-shape.

[0054] Example 2

[0055] Figure 3 Schematic diagram of the anti-misoperation medical three-way valve provided in the embodiments of this application Figure 3 , Figure 3 The top center is a cross-sectional view of the three-way valve. Figure 3 The lower center is a top view of the annular groove. (See image below.) Figure 4 As shown, the first locking structure 410 is an annular groove, and the second locking structure 420 is a plurality of latches, with the groove of the annular groove engaging with the latches.

[0056] The interlocking structure 400 is configured to move the plurality of latches to the annular groove of the cylindrical valve core 200 to insert the plurality of latches into the groove body of the annular groove, so that the second locking structure 420 is engaged and locked with the first locking structure 410.

[0057] The interlocking structure 400 of the technical solution is locked by the plug-in cooperation of the annular groove and the latch. Since the second locking structure 420 at the bottom of the cylindrical valve core 200 is a plurality of latches, and the first locking structure 410 at the bottom of the accommodating cavity 110 is an annular groove, when the handle 300 is pressed, the cylindrical valve core 200 drives the latches to move to the annular groove, and after the latches are inserted into the groove body of the annular groove, the latches are engaged and locked by the interference fit between the latches and the inner wall of the groove body. When the handle 300 is pulled, the latches are separated from the annular groove, and the cylindrical valve core 200 is unlocked. In a specific implementation, the annular groove can be, for example, an annular groove with a width of 1.5 mm and a depth of 0.8 mm, and the opposite inner side walls thereof can be, for example, vertical walls as shown in Figure 4 , or can be designed as 30° guide inclined surfaces. The latches can be, for example, integrally formed with the cylindrical valve core 200 by an injection molding process, and the ends of the latches can be, for example, rectangular heads as shown in Figure 4 , or can be wedge-shaped heads. The wedge-shaped heads can be machined to have a thickness slightly greater than the width of the entrance of the annular groove to form an interference fit. When the cylindrical valve core 200 is pressed down, the wedge-shaped heads of the latches slide along the guide inclined surfaces of the annular groove, the latches are elastically deformed inward until they are completely embedded in the groove body, at which time the interference contact between the latches and the inner wall of the groove body generates a radial clamping force to limit the rotation of the cylindrical valve core 200. When the cylindrical valve core 200 is pulled, the wedge-shaped heads are retracted under the action of the reverse force, the latches are separated from the annular groove, and the lock is unlocked. The technical effects of this design are as follows: first, the plug-in structure of the latches and the annular groove can be molded in one step by an injection mold without the need for additional assembly steps, which greatly reduces production costs; second, the symmetrical groove design of the annular groove makes the force on the latches uniform, avoiding unilateral wear that can cause the lock to fail.

[0058] Embodiment Three

[0059] Figure 5 The anti-misrotation medical three-way valve structure provided in the embodiments of the present application is shown in Figure 5 , and as shown in ​ , the first locking structure 410 is a conical cavity, and the cavity of the conical cavity is conical. The second locking structure 420 is a conical protrusion, and the conical protrusion cooperates with the conical cavity.

[0060] The interlocking structure 400 is configured to move the conical protrusion to the conical cavity of the cylindrical valve core 200 to insert the conical protrusion into the cavity of the conical cavity, so that the second locking structure 420 is engaged and locked with the first locking structure 410.

[0061] Specifically, since the first locking structure 410 at the bottom of the accommodating cavity 110 is a tapered cavity, the inner wall of the cavity is a tapered surface, and the second locking structure 420 at the bottom of the cylindrical valve core 200 is a tapered protrusion, when the handle 300 is pressed, the cylindrical valve core 200 drives the tapered protrusion to move towards the tapered cavity, after the tapered protrusion is inserted into the tapered cavity, the outer wall of the tapered protrusion is in interference contact with the inner wall of the tapered cavity, so as to limit the rotation of the cylindrical valve core 200 by the friction force of the tapered surface; when the handle 300 is pulled, the tapered protrusion is separated from the tapered cavity, and the cylindrical valve core 200 restores the free rotation. In a specific implementation manner, the tapered cavity can be designed as an inverted conical cavity with a taper angle of 15°, and the inner wall surface thereof can be roughened by a sandblasting process to increase the friction coefficient; the tapered protrusion can be integrally injection molded with the cylindrical valve core 200, the taper angle of the tapered protrusion matches that of the tapered cavity, and the thickness of the root of the tapered protrusion is slightly greater than the diameter of the inlet of the tapered cavity to form an initial interference amount. When the cylindrical valve core 200 is pressed down, the tapered protrusion is elastically deformed in the radial direction under the extrusion of the inner wall of the tapered cavity, and restores the deformation after being completely inserted, at which time the tapered protrusion is attached to the tapered surface of the tapered cavity to generate circumferential friction resistance; when the cylindrical valve core 200 is pulled, the elastic deformation amount of the tapered protrusion is released, and the tapered surfaces are separated to be unlocked. The technical effects of this design are as follows: first, the matching structure of the tapered cavity and the tapered protrusion can be completed by single injection molding without additional processing of buckles or grooves, which significantly reduces the production cost; second, the self-locking property of the tapered surface makes the stability of the locked state high, and accidental unlocking caused by vibration can be avoided.

[0062] Optionally, a layer of silica gel can be sprayed on the surface of the tapered cavity, and the tapered protrusion abuts against the silica gel layer after being inserted into the tapered cavity, which further improves the friction force and the stability of the locking.

[0063] Embodiment Four

[0064] ​ A schematic diagram of the anti-skid lines provided in the embodiments of the present application is shown in FIG. 2, in which the side wall of the cylindrical valve core 200 has anti-skid lines 220, and the anti-skid lines 220 abut against the inner wall of the accommodating cavity 110. ​

[0065] ​Specifically, the design realizes stable control of the valve core through the cooperation of the anti-skid lines 220 and the interlocking structure 400: because the side wall of the cylindrical valve core 200 is provided with the anti-skid lines 220, when the cylindrical valve core 200 is in the unlocked state, the anti-skid lines 220 abut against the inner wall of the accommodating cavity 110 to generate frictional resistance, thereby limiting the free rotation of the cylindrical valve core 200; when the handle 300 is pressed, the first locking structure 410 and the second locking structure 420 are engaged and locked, further fixing the circumferential position of the cylindrical valve core 200. In a specific implementation manner, the anti-skid lines 220 may, for example, be processed into an array of rhombic protrusions on the side wall of the cylindrical valve core 200 through knurling process, the protrusion height may be, for example, 0.1-0.3mm, and the material is selected to be wear-resistant POM plastic to prolong the service life; the inner wall of the accommodating cavity 110 may, for example, be sprayed with a layer of silica gel to enhance the static friction force with the anti-skid lines 220, while avoiding scratching the surface of the valve core. The technical effects of the design are embodied in: first, the texture design of the anti-skid lines 220 and the locking action of the interlocking structure 400 are linked, which not only guarantees the operation stability in the unlocked state, but also avoids the interference of resistance in the locking process; second, the components of the anti-skid lines 220 and the interlocking structure 400 can be integrally formed through injection molding process, without additional assembly cost.

[0066] Finally, it should be noted that: other embodiments of the utility model will be easily thought of by those skilled in the art after considering the specification and practicing the utility model disclosed herein. The utility model aims to cover any variations, uses or adaptability of the utility model, which follow the general principles of the utility model and include the common knowledge or conventional technical means in the technical field of the utility model not disclosed by the utility model, and are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the utility model is only limited by the appended claims.

Claims

1. A medical three-way valve for preventing accidental rotation, characterized in that, The three-way valve includes a valve body (100), a cylindrical valve core (200), a handle (300), and an interlocking structure (400). The valve body (100) has a receiving cavity (110) that receives the cylindrical valve core (200), which is connected to the handle (300). The valve body (100) is provided with three external passages (120), which are located at different positions on the valve body (100). The external passages (120) penetrate the valve body (100), and the inner end of the external passages (120) is connected to the receiving cavity (110), while the outer end of the external passages (120) is connected to the outside of the valve body (100). The cylindrical valve core (200) is provided with an internal passage (210), which penetrates the cylindrical valve core (200). The cylindrical valve core (200) is used so that when the handle (300) rotates, it drives the cylindrical valve core (200) to rotate within the receiving cavity (110), so that the internal passage (210) connects any two of the external passages (120), while simultaneously closing the remaining external passages (120). The interlocking structure (400) includes a first locking structure (410) disposed at the bottom of the receiving cavity (110) and a second locking structure (420) disposed on the cylindrical valve core (200). The interlocking structure (400) is configured such that pressing the handle (300) moves the cylindrical valve core (200) toward the first locking structure (410) to engage and lock the second locking structure (420) with the first locking structure (410), and pulling the handle (300) moves the cylindrical valve core (200) away from the first locking structure (410) to disengage the second locking structure (420) from the first locking structure (410).

2. The three-way valve according to claim 1, characterized in that, The first locking structure (410) is an anti-rotation boss, and the second locking structure (420) has a clamping space. The clamping space cooperates with the anti-rotation boss. The interlocking structure (400) is configured such that after the cylindrical valve core (200) drives the second locking structure (420) to move toward the anti-rotation boss so that the anti-rotation boss is engaged in the clamping space, the second locking structure (420) clamps and holds the outer wall of the anti-rotation boss so that the second locking structure (420) and the first locking structure (410) engage and lock.

3. The three-way valve according to claim 2, characterized in that, The second locking structure (420) consists of multiple sheet-like buckles, the inner walls of which form the clamping space.

4. The three-way valve according to claim 2, characterized in that, The second locking structure (420) is an annular member, and the inner cavity of the annular member forms the clamping space.

5. The three-way valve according to claim 1, characterized in that, The first locking structure (410) is an annular groove, and the second locking structure (420) is a plurality of latches, wherein the groove of the annular groove engages with the latches; The interlocking structure (400) is configured such that the cylindrical valve core (200) drives the plurality of latches to move toward the annular groove so that the plurality of latches are inserted into the groove of the annular groove, so that the second locking structure (420) engages and locks with the first locking structure (410).

6. The three-way valve according to claim 5, characterized in that, The two inner sidewalls opposite to each other of the groove are guide slopes, and one end of the latch is a wedge-shaped head. The outer wall of the wedge-shaped head cooperates with the guide slope so that after the multiple latches are inserted into the groove of the annular groove, the second locking structure (420) engages and locks with the first locking structure (410).

7. The three-way valve according to claim 1, characterized in that, The first locking structure (410) is a conical cavity, the cavity of which is conical, and the second locking structure (420) is a conical protrusion that engages with the conical cavity. The interlocking structure (400) is configured such that the cylindrical valve core (200) drives the conical protrusion to move toward the conical cavity so that the conical protrusion is inserted into the cavity of the conical cavity, so that the second locking structure (420) engages and locks with the first locking structure (410).

8. The three-way valve according to claim 7, characterized in that, The inner wall of the conical cavity has a silicone layer. After the conical protrusion is inserted into the cavity of the conical cavity, the silicone layer abuts against the outer wall of the conical protrusion. The silicone layer and the outer wall of the conical protrusion engage and lock the second locking structure (420) with the first locking structure (410) through friction.

9. The three-way valve according to claim 1, characterized in that, The cylindrical valve core (200) has anti-slip texture (220) on its sidewall, which abuts against the inner wall of the receiving cavity (110).

10. The three-way valve according to any one of claims 1-9, characterized in that, The internal passage (210) includes at least two branch passages, and the internal passage (210) is configured such that when the two branch passages connect the inner ends of the two external passages (120), the sidewall of the cylindrical valve core (200) closes the inner end of the other external passage (120).

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