A cage-type throttle valve

Abstract

This utility model relates to the field of throttling valves, specifically a cage-type throttling valve. The utility model includes a valve body with a through hole. One side of the through hole connects to an inlet flow channel. A cage is housed within the through hole, and the cage has several holes. The cage is located at the connection between the through hole and the inlet flow channel. A valve core is housed within the cage. A driving member is located on the side of the valve body away from the through hole, driving the valve core to slide within the cage. A first conical surface is provided at the end of the cage near the driving member, and a second conical surface is provided at the end of the valve core away from the driving member. A converging structure is provided on the inner wall of the end of the cage away from the driving member. The hollow tube diameter of the converging structure is smaller than the valve core diameter. A third conical surface is provided at the end of the converging structure near the driving member. Using the technical solution of this utility model, the conical surface guidance can replace the heat-fitting process and maintain alignment during assembly.

Description

Technical Field

[0001] This utility model relates to the field of throttle valve technology, and more specifically, to a cage-type throttle valve. Background Technology

[0002] The cage-type throttle valve is an advanced type of regulating valve. Its core feature is a cylindrical "cage" with a specific window opening outside the valve core. The valve core moves up and down within the cage, achieving precise flow regulation and pressure control by changing the overlap area between itself and the cage's window opening. This structural design enables multi-stage pressure reduction, effectively suppressing cavitation and erosion, and significantly reducing noise and vibration. Furthermore, the large guide surfaces of the valve core and cage ensure smooth operation and strong impact resistance. The valve core typically employs a balanced design, requiring minimal actuator thrust. Its valve cover often uses a pressure-self-tightening sealing structure, with sealing performance increasing with internal pressure. Maintenance only requires replacing the cage and valve core to restore performance, making it ideal for harsh operating conditions with high pressure differentials and cavitation susceptibility.

[0003] In existing technologies, the cage sleeve and valve core are fitted together using a heat-fitting process. The heat-fitted components have extremely high alignment because the hole and shaft are fitted with a uniform interference fit, preventing eccentricity. However, the heat-fitting process also makes disassembly of the mating parts more difficult. Furthermore, fluid flowing out of the cage sleeve impacts the valve body, making the valve body outlet area prone to damage. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a cage-type throttle valve, which uses conical surface guidance to replace the hot-fitting process and maintains alignment during assembly.

[0005] This utility model is achieved through the following technical solution: a cage-type throttle valve, including a valve body, a through hole on the valve body, an inlet flow channel connected to one side of the through hole, a cage inside the through hole, a number of holes on the cage, the cage being located at the connection between the through hole and the inlet flow channel, a valve core inside the cage, and a driving component on the side of the valve body away from the through hole, the driving component being used to drive the valve core to slide inside the cage.

[0006] The cage sleeve has a first conical surface at the end near the drive component, a second conical surface at the end of the valve core away from the drive component, a converging structure on the inner wall of the end of the cage sleeve away from the drive component, the hollow tube diameter of the converging structure is smaller than the valve core diameter, and a third conical surface at the end of the converging structure near the drive component.

[0007] Furthermore, a diffuser tube is provided on the side of the through hole away from the drive component, and the diffuser tube is made of cermet.

[0008] Furthermore, a protective sleeve is provided inside the through hole. The protective sleeve is divided into a first sleeve section and a second sleeve section. The first sleeve section is fitted onto the valve core, and the second sleeve section is fitted onto the cage sleeve. The second sleeve section has holes in the same position as the holes in the cage sleeve.

[0009] Furthermore, the second sleeve is constrained to the cage by a flat key, and a first O-ring is provided between the second sleeve and the through hole.

[0010] Furthermore, the driving component includes a housing, a handwheel is provided on one side of the housing, a drive rod is coaxially fixedly connected to the handwheel, the drive rod extends into the housing, a valve stem is detachably connected to the end of the drive rod away from the handwheel, the valve stem is threadedly connected to the housing, and the valve stem and valve core are detachably connected by a locking screw.

[0011] Furthermore, the drive rod and valve rod are detachably connected by a safety pin, and the housing is provided with a pin hole for providing a channel for inserting the safety pin.

[0012] Furthermore, the housing is detachably connected to the valve body via a union.

[0013] Furthermore, a number of second O-rings are provided on the side of the housing near the valve body, and a sealing ring assembly is provided between the valve stem and the housing.

[0014] Furthermore, a nameplate is detachably attached to the housing.

[0015] The technical solution of this utility model has at least the following beneficial effects:

[0016] The conventional method for assembling the valve core and cage sleeve is heat assembly. This involves heating the cage sleeve to expand its diameter before inserting the valve core. Because of the extremely high fit between the valve core and cage sleeve, and the minimal excess diameter in the cage sleeve, floating is unlikely, thus ensuring the valve core's alignment. However, this extremely high fit also makes disassembly and maintenance difficult.

[0017] In this design, the second conical surface of the valve core acts as a guide. When the second conical surface contacts the first conical surface of the cage, a component force along the conical surface is generated due to the conical contact, guiding the valve core to slide into the cage, thus making it easier for the valve core to enter the cage. After the valve core enters the cage, it continues to advance to the convergence structure. The hollow tube diameter of the convergence structure is smaller than the valve core diameter, preventing the valve core from sliding out of the cage. Upon reaching the third conical surface, the third conical surface generates a component force to guide the valve core into it. The third conical surface also generates a component force, pointing towards its center, ultimately causing the second conical surface of the valve core to reach and fit against the bottom center of the third conical surface, maintaining a stable position and ensuring a high degree of alignment within the cage. After the subsequent assembly of the drive component, the valve core is fixedly connected to the drive component, locking its position and ensuring alignment throughout subsequent use. Because this design eliminates the need for heat assembly, it has lower requirements for the amount of excess bore in the cage and facilitates disassembly and maintenance. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the cage-type throttle valve of this utility model;

[0019] Figure 2 for Figure 1 A partial sectional view along line A in the middle;

[0020] Figure 3 for Figure 1 An enlarged schematic diagram of part B in the diagram.

[0021] Reference numerals: 1. Valve body; 2. Through hole; 3. Inlet flow channel; 4. Cage sleeve; 5. Hole; 6. Valve core; 7. Drive component; 8. First conical surface; 9. Second conical surface; 10. Third conical surface; 11. Diffuser tube; 12. Sheath; 13. Flat key; 14. First O-ring; 701. Housing; 702. Handwheel; 703. Drive rod; 704. Valve stem; 705. Locking screw; 706. Safety pin; 707. Union joint; 708. Second O-ring; 709. Sealing ring assembly; 7010. Nameplate; 1201. First sleeve; 1202. Second sleeve; 1203. Hole. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The following detailed description illustrates the specific implementation method:

[0026] Example 1

[0027] As attached Figures 1-3 As shown, a cage-type throttle valve includes a valve body 1, a through hole 2 on the valve body 1, an inlet flow channel 3 connected to one side of the through hole 2, a cage 4 inside the through hole 2, a plurality of holes 5 on the cage 4, the cage 4 being located at the connection between the through hole 2 and the inlet flow channel 3, a valve core 6 inside the cage 4, and a driving member 7 on the side of the valve body 1 away from the through hole 2, the driving member 7 being used to drive the valve core 6 to slide inside the cage 4.

[0028] The drive unit 7 includes a housing 701. A handwheel 702 is located on one side of the housing 701. A drive rod 703 is coaxially welded to the handwheel 702 and extends into the housing 701. A bearing is located inside the housing 701 to enable rotational connection between the drive rod 703 and the housing 701. The housing 701 has an oil cup for replenishing lubricating oil to the bearing. A valve stem 704 is detachably connected to the end of the drive rod 703 away from the handwheel 702 via a safety pin 706. The valve stem 704 is threaded to the housing 701 and detachably connected to the valve core 6 via a locking screw 705. A pin hole is provided on the housing 701 to provide a channel for inserting the safety pin 706. The housing 701 is detachably connected to the valve body 1 via a union 707. Several second O-rings 708 are provided on the side of the housing 701 near the valve body 1, and a sealing ring assembly 709 is provided between the valve stem 704 and the housing 701. A nameplate 7010 is detachably connected to the housing 701. An acrylic plate is provided on the back of the nameplate 7010. The acrylic plate is used to seal the pin hole after assembly.

[0029] The cage sleeve 4 has a first conical surface 8 at the end near the drive component 7, and a second conical surface 9 at the end of the valve core 6 away from the drive component 7. The inner wall of the cage sleeve 4 away from the drive component 7 has a converging structure. The hollow tube diameter of the converging structure is smaller than the diameter of the valve core 6. The end of the converging structure near the drive component 7 has a third conical surface 10.

[0030] The conventional method for assembling the cage sleeve 4 and valve core 6 is heat assembly. This involves heating the cage sleeve 4 to expand its diameter before fitting the valve core 6 inside. Because the fit between the valve core 6 and the cage sleeve 4 is extremely tight, the excess diameter of the cage sleeve 4 is minimal, reducing the likelihood of floating and ensuring the alignment of the valve core 6. However, this extremely tight fit makes disassembly and maintenance difficult.

[0031] In this embodiment, during assembly, the second conical surface 9 of the valve core 6 can guide the valve core 6. When the second conical surface 9 contacts the first conical surface 8 of the cage sleeve 4, due to the conical contact, a component force along the conical surface is generated, which can guide the valve core 6 to slide into the cage sleeve 4, making it easier for the valve core 6 to enter the cage sleeve 4. After the valve core 6 enters the cage sleeve 4, it will continue to advance to the converging structure. The hollow tube diameter of the converging structure is smaller than the diameter of the valve core 6, so the valve core 6 will not slide out of the cage sleeve 4. When it reaches the third conical surface 10, the third conical surface 10 will guide the valve core 6 into the third conical surface 10 by generating a component force. The third conical surface 10 also generates a component force, which points to the center of the third conical surface 10, ultimately causing the second conical surface 9 of the valve core 6 to reach the bottom center of the third conical surface 10 and fit together, maintaining a stable position, while ensuring that the valve core 6 maintains a very high degree of centering in the cage sleeve 4. After the drive component 7 is assembled, the valve core 6 will be fixedly connected to the drive component 7, and the position of the valve core 6 will be locked, ensuring that it remains aligned during subsequent use. Since this solution does not require thermal assembly, the requirement for the excess orifice diameter of the cage sleeve 4 is lower, and it allows for easy disassembly and maintenance.

[0032] The housing 701 is detachably connected to the valve body 1 via a union 707. During disassembly and maintenance, the valve body 1 and housing 701 can be separated by rotating the union 707, exposing the through hole 2. Removing the housing 701 allows the valve stem 704 and valve core 6 to be removed. After unscrewing the locking screw 705, the valve core 6 can be removed, facilitating maintenance or replacement by the user. Because the housing 701 and valve body 1 are designed for detachment, several second O-rings 708 are provided on the side of the housing 701 near the valve body 1 to ensure sealing performance after assembly. The sealing ring assembly 709 between the valve stem 704 and housing 701 also seals the gap between them, reducing the impact of leakage.

[0033] In use, fluid flows in through the inlet channel 3. After entering the inlet channel 3, the fluid enters the cage 4 through the hole 5 and flows into the through hole 2. When the user turns the handwheel 702, the handwheel 702 drives the drive rod 703 to rotate. The drive rod 703 and the valve stem 704 are detachably connected by a safety pin 706. When the safety pin 706 is pulled out, the drive rod 703 is disengaged from the valve stem 704, and the rotation of the drive rod 703 will not be transmitted to the valve stem 704, thus ensuring that the handwheel 702 will not trigger a change in the state of the valve core 6 due to accidental contact. The safety pin 706 can be inserted into the connection between the drive rod 703 and the valve stem 704 through the pin hole. When the handwheel 702 drives the drive rod 703 to rotate, it will drive the valve stem 704 to rotate. Since the valve stem 704 is threaded to the housing 701, the valve core 6 will slide up and down when the valve stem 704 rotates. The sliding of valve core 6 will change the area of ​​the orifice 5 blocked by valve core 6. The area of ​​orifice 5 represents the cross-sectional size of fluid flow. Therefore, after the area of ​​orifice 5 changes, it can play a throttling role.

[0034] Example 2

[0035] The difference from the above embodiment is that a diffuser tube 11 is provided on the side of the through hole 2 away from the drive member 7, and the diffuser tube 11 is made of metal ceramic.

[0036] After the fluid flows out of the cage sleeve 4, it will impact the valve body 1, making the opening of the through hole 2 on the side of the valve body 1 away from the drive component 7 more susceptible to damage from the impact. Therefore, a diffuser 11 is provided on the side of the through hole 2 away from the drive component 7. When the fluid flows out of the cage sleeve 4, the diffuser 11 bears the impact. The diffuser 11 is made of metal ceramic to ensure that it has sufficient rigidity and impact resistance.

[0037] Example 3

[0038] The difference from the above embodiment is that a protective sleeve 12 is provided inside the through hole 2. The protective sleeve 12 is divided into a first sleeve segment 1201 and a second sleeve segment 1202. The first sleeve segment 1201 is fitted onto the valve core 6, and the second sleeve segment 1202 is fitted onto the cage sleeve 4. The second sleeve segment 1202 has a hole 1203 in the same position as the hole 5 in the cage sleeve 4. The second sleeve segment 1202 and the cage sleeve 4 are constrained by a flat key 13, and a first O-ring 14 is provided between the second sleeve segment 1202 and the through hole 2.

[0039] The sheath 12 protects the valve core 6 and the cage sleeve 4, and also provides further positional constraint. The sheath 12 is fitted onto the valve core 6 and the cage sleeve 4 via a first sleeve section 1201 and a second sleeve section 1202, guiding the valve core 6 to slide and constraining the position of the cage sleeve 4. The second sleeve section 1202 is constrained to the cage sleeve 4 by a flat key 13 to prevent vertical sliding between the sheath 12 and the cage sleeve 4. The hole 1203 is located at the same position as the hole 5 in the cage sleeve 4, allowing fluid to flow into the hole 5 through the hole 1203 without affecting the throttling function. The first O-ring 14 seals the gap between the second sleeve section 1202 and the through hole 2 to prevent fluid from being released directly without being throttled by the cage sleeve 4.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A cage-type throttle valve, characterized in that, The valve body (1) includes a through hole (2) on the valve body (1), an inlet flow channel (3) connected to one side of the through hole (2), a cage (4) inside the through hole (2), a number of holes (5) on the cage (4), the cage (4) being located at the connection between the through hole (2) and the inlet flow channel (3), a valve core (6) inside the cage (4), and a driving member (7) on the side of the valve body (1) away from the through hole (2), the driving member (7) being used to drive the valve core (6) to slide inside the cage (4); The cage sleeve (4) has a first conical surface (8) at the end near the drive member (7), and the valve core (6) has a second conical surface (9) at the end away from the drive member (7). The inner wall of the cage sleeve (4) at the end away from the drive member (7) has a converging structure. The hollow tube diameter of the converging structure is smaller than the diameter of the valve core (6). The end of the converging structure near the drive member (7) has a third conical surface (10).

2. The cage-type throttle valve according to claim 1, characterized in that, A diffuser tube (11) is provided on the side of the through hole (2) away from the drive member (7), and the diffuser tube (11) is made of metal ceramic.

3. The cage-type throttle valve according to claim 1, characterized in that, The through hole (2) is provided with a protective sleeve (12). The protective sleeve (12) is divided into a first sleeve section (1201) and a second sleeve section (1202). The first sleeve section (1201) is fitted on the valve core (6), and the second sleeve section (1202) is fitted on the cage sleeve (4). The second sleeve section (1202) is provided with a hole (1203) at the same position as the hole (5) of the cage sleeve (4).

4. The cage-type throttle valve according to claim 3, characterized in that, The second sleeve (1202) is constrained to the cage (4) by a flat key (13), and a first O-ring (14) is provided between the second sleeve (1202) and the through hole (2).

5. The cage-type throttle valve according to claim 1, characterized in that, The drive unit (7) includes a housing (701), a handwheel (702) is provided on one side of the housing (701), a drive rod (703) is coaxially fixedly connected to the handwheel (702), the drive rod (703) extends into the housing (701), a valve stem (704) is detachably connected to the end of the drive rod (703) away from the handwheel (702), the valve stem (704) is threadedly connected to the housing (701), and the valve stem (704) and the valve core (6) are detachably connected by a locking screw (705).

6. The cage-type throttle valve according to claim 5, characterized in that, The drive rod (703) and the valve stem (704) are detachably connected by a safety pin (706). The housing (701) is provided with a pin hole for providing a channel for inserting the safety pin (706).

7. The cage-type throttle valve according to claim 5, characterized in that, The housing (701) is detachably connected to the valve body (1) via a union (707).

8. The cage-type throttle valve according to claim 7, characterized in that, The housing (701) is provided with several second O-rings (708) on the side near the valve body (1), and a sealing ring group (709) is provided between the valve stem (704) and the housing (701).

9. The cage-type throttle valve according to claim 5, characterized in that, A nameplate (7010) is detachably attached to the housing (701).

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