A seal structure for a venturi valve

Abstract

The application relates to a sealing structure of a Venturi valve and relates to the technical field of Venturi valves, and comprises a Venturi tube section, a valve core module and a sealing assembly, wherein the valve core module is installed in the interior of the Venturi tube section. The application stably supports a silicon carbide ceramic shell through a baffle, reduces friction loss with a sealing ring by virtue of the excellent wear resistance of the silicon carbide ceramic shell, prevents the silicon carbide ceramic shell from being broken under stress by virtue of the high strength of an inco nickel alloy block embedded in the interior of the silicon carbide ceramic shell and resisting medium pressure impact, increases sealing contact length to block medium penetration by precisely inserting a groove on the outer surface of the sealing ring with the silicon carbide ceramic shell and the inco nickel alloy block, and automatically compensates for the wear amount of the sealing ring by pushing a ring-shaped plate, a ring-shaped connecting block and the sealing ring by a compensation spring in a ring-shaped groove when the sealing ring is slightly worn, so that the sealing reliability is greatly improved compared with existing single sealing, and the problem of being prone to gaps due to vibration is solved.

Description

Technical Field

[0001] This application relates to the field of venturi valve technology, and in particular to a sealing structure for a venturi valve. Background Technology

[0002] A Venturi valve is an airflow control device manufactured based on the Venturi effect. It combines a mechanical pressure-independent regulator with a high-speed airflow controller, extending airflow control to its highest level. Through aerodynamic design, the valve operates quietly. Venturi valves are characterized by their insensitivity to duct pressure changes, wide airflow control range, rapid response, and precise adjustment. An existing patent (publication number: CN217842840U) discloses a venturi valve sealing housing, valve core, and venturi valve. The venturi valve sealing housing includes a first connecting section for connecting to a duct, an air delivery section connected to the first connecting section for airflow passage, a sealing section connected to the air delivery section for engaging with the valve core and having a gradually decreasing inner diameter, and a second connecting section connected to the sealing section. An annular sealing protrusion is formed on the sealing section by tightening along the circumference of the housing towards the housing axis. The sealing protrusion engages with the valve core to seal the valve body. The venturi valve sealing valve core includes a valve core hemisphere, a valve core cone, and an elastic damping element disposed inside the valve core. A flexible sealing ring is disposed on the valve core cone, on the surface of the valve core cone facing the valve core hemisphere. Based on the above structural design, this application also proposes a venturi valve that achieves complete shut-off of airflow through the tight contact between the flexible sealing ring and the sealing protrusion, ensuring precise control of the airflow.

[0003] While the aforementioned technologies can achieve basic airflow shut-off through the tight contact between the flexible sealing ring and the annular sealing protrusion, this structure still has shortcomings. It relies solely on a single sealing connection between the flexible sealing ring and the sealing protrusion. When the venturi valve is used in environments where equipment vibration occurs during operation, tiny gaps can easily appear between the sealing ring and the sealing protrusion, leading to media leakage and making it impossible to maintain a long-term stable sealing effect. Furthermore, the flexible sealing ring is prone to wear after long-term friction with the sealing protrusion, and the existing structure does not have an automatic wear compensation mechanism. After wear, the sealing ring needs to be frequently disassembled and replaced, which not only increases maintenance costs but also interrupts continuous equipment operation. Utility Model Content

[0004] The purpose of this application is to provide a sealing structure for a venturi valve, which adopts a multi-seal method to improve the sealing effect, extend the sealing life, and solve the problems mentioned in the background art.

[0005] The sealing structure of a venturi valve provided in this application adopts the following technical solution: A sealing structure of a venturi valve includes a venturi tube section, a valve core module, and a sealing assembly. The valve core module is installed inside the venturi tube section. The sealing assembly includes a baffle fixedly connected to the inner wall of the venturi tube section. A silicon carbide ceramic shell is fixedly connected to one side of the baffle. An Inconel alloy protrusion is embedded inside the silicon carbide ceramic shell.

[0006] An annular groove is fixedly connected to the outer surface of the valve core module. A compensating spring is sleeved on the inner wall of the annular groove. An annular plate is fixedly connected to the other end of the compensating spring. An annular connecting block is fixedly connected to the side of the annular plate away from the compensating spring. A sealing ring is fixedly connected to one end of the annular connecting block. A groove is formed on the outer surface of the sealing ring.

[0007] By adopting the above technical solution, the baffle provides stable support for the silicon carbide ceramic shell, preventing deformation of the silicon carbide ceramic shell during sealing. The silicon carbide ceramic shell has excellent wear resistance, which can reduce frictional loss with the sealing ring during sealing. The embedded Inconel alloy bumps, with their high strength, can resist the impact of media pressure on the sealing part, preventing the silicon carbide ceramic shell from cracking due to excessive force. The annular groove provides installation space for the compensation spring, ensuring that the compensation spring is always in a stable working state. When the sealing ring is slightly worn, the compensation spring can push the annular plate and the annular connecting block to move the sealing ring in the sealing direction, realizing automatic compensation for wear. The groove on the outer surface of the sealing ring can form a precise insertion fit with the silicon carbide ceramic shell and the Inconel alloy bumps, which not only increases the sealing contact area but also prevents the media from penetrating from the sealing gap. Compared with the existing single-point sealing structure, this multi-seal fit can significantly improve the sealing reliability. At the same time, the wear resistance of the silicon carbide ceramic shell and the impact resistance of the Inconel alloy bumps can effectively extend the overall service life of the sealing assembly.

[0008] Preferably, both ends of the venturi tube section are fixedly connected to a fixing bracket, and a valve stem is installed between the two fixing brackets.

[0009] By adopting the above technical solution, the fixing brackets at both ends inside the Venturi tube section can provide bidirectional support for the valve stem, preventing axial displacement or shaking when the valve core module moves. This bidirectional support structure can ensure that the valve stem always stays in the central axis position of the Venturi tube section, thereby ensuring that the docking position between the valve core module and the sealing component is always accurate, providing a basic guarantee for the stability of the subsequent sealing effect.

[0010] Preferably, a guide sleeve is fitted on the outer surface of the valve stem, a valve core module is mounted on the outer surface of the guide sleeve, and a drive component is provided at one end of the valve core module.

[0011] By adopting the above technical solution, the guide sleeve on the outer surface of the valve stem can restrict the movement direction of the valve stem, prevent the valve stem from radially swinging when moving up and down, and ensure that the valve core module always maintains a stable posture when moving with the guide sleeve. The drive component at one end of the valve core module can provide a stable power source and is convenient to use.

[0012] Preferably, the drive assembly includes a mounting bracket fixedly connected to the outer surface of the venturi tube section, an electric actuator hinged to the top of the mounting bracket, and a connecting rod hinged to the output end of the electric actuator.

[0013] By adopting the above technical solution, the mounting bracket can stably fix the electric push rod on the outer surface of the venturi tube section, preventing displacement of the electric push rod during operation and ensuring stable power output direction. The connecting rod hinged at the output end of the electric push rod can flexibly transmit power and adapt to the angle changes between the electric push rod and subsequent transmission components, avoiding jamming during power transmission and ensuring that the power of the drive component can be smoothly transmitted to the valve core module.

[0014] Preferably, a sealing seat is installed on the inner wall of the venturi tube section, and the connecting rod is hinged in the inner wall of the sealing seat.

[0015] By adopting the above technical solution, the sealing seat on the inner wall of the Venturi tube section can provide fixed support for the connecting rod, limit the range of motion of the connecting rod, prevent excessive swinging of the connecting rod when transmitting power, and ensure the stability of the power transmission path. At the same time, the hinged fit between the inner wall of the sealing seat and the connecting rod can reduce frictional loss between the two, extend the service life of the components, and thus ensure that the power of the drive assembly can be accurately transmitted to the subsequent components.

[0016] Preferably, a transmission rod is hinged to the bottom end of the sealing seat, and the end of the transmission rod away from the connecting rod is hinged to the outer surface of the guide sleeve.

[0017] By adopting the above technical solution, the transmission rod hinged at the bottom of the sealing seat can build a power transmission bridge between the sealing seat and the guide sleeve, so that the power of the drive component can be smoothly transmitted to the guide sleeve through the connecting rod, the sealing seat, and the transmission rod, which can ensure that the force is uniform when the guide sleeve drives the valve core module to move.

[0018] Preferably, both the annular plate and the annular connecting block are slidably fitted into the inner wall of the annular groove.

[0019] By adopting the above technical solution, the structure in which the annular plate and the annular connecting block are slidably fitted on the inner wall of the annular groove can restrict the movement direction of both, ensuring that they can only move along the axial direction of the annular groove, avoiding radial offset under the action of the compensating spring, and thus ensuring that the sealing ring always moves along the sealing direction and maintains precise docking with the silicon carbide ceramic shell and the Inconel nickel alloy protrusion.

[0020] Preferably, the silicon carbide ceramic shell and the Inconel alloy bump are inserted into the inner wall of the groove.

[0021] By adopting the above technical solution, the structure in which the silicon carbide ceramic shell and the Inconel nickel alloy bump are inserted into the inner wall of the groove can form a radial sealing fit. Compared with the traditional surface contact seal, this insertion fit can significantly increase the sealing contact length, extend the medium penetration path, and effectively block the medium from passing through the sealing gap.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This venturi valve's sealing structure uses a baffle to stably support the silicon carbide ceramic shell. The excellent wear resistance of the silicon carbide ceramic shell reduces frictional loss with the sealing ring. Simultaneously, the Inconel alloy protrusions embedded inside the silicon carbide ceramic shell provide high strength to resist media pressure impacts, preventing the silicon carbide ceramic shell from cracking under stress. Furthermore, the precise insertion of the groove on the outer surface of the sealing ring with the silicon carbide ceramic shell and the Inconel alloy protrusions increases the sealing contact length to prevent media penetration. When the sealing ring experiences slight wear, the compensating spring in the annular groove can push the annular plate and annular connecting block to automatically compensate for the wear. Compared to existing single-point seals, this significantly improves sealing reliability and solves the problem of gaps easily appearing due to vibration. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application from a low angle. Figure 2 This is a schematic diagram of the overall second bottom view structure of this application; Figure 3 This is a partial sectional planar structural diagram of this application; Figure 4 For this application Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of a partial explosion structure in this application.

[0024] In the picture: 1. Venturi tube section; 2. Fixing bracket; 3. Valve stem; 4. Guide sleeve; 5. Valve core module; 6. Drive assembly; 601. Mounting bracket; 602. Electric push rod; 603. Connecting rod; 604. Sealing seat; 605. Transmission rod; 7. Sealing assembly; 701. Baffle; 702. Silicon carbide ceramic shell; 703. Inconel nickel alloy protrusion; 704. Annular groove; 705. Compensating spring; 706. Annular plate; 707. Annular connecting block; 708. Sealing ring; 709. Groove. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5This application will be described in further detail below.

[0026] Example 1: A sealing structure for a venturi valve, referring to... Figure 1 , Figure 3 and Figure 4 The system includes a venturi section 1, a valve core module 5, and a sealing assembly 7. The valve core module 5 is installed inside the venturi section 1. The sealing assembly 7 includes a baffle 701 fixedly connected to the inner wall of the venturi section 1. A silicon carbide ceramic shell 702 is fixedly connected to one side of the baffle 701. An Inconel alloy protrusion 703 is embedded inside the silicon carbide ceramic shell 702. An annular groove 704 is fixedly connected to the outer surface of the valve core module 5. A compensating spring 705 is sleeved on the inner wall of the annular groove 704. An annular plate 706 is fixedly connected to the other end of the compensating spring 705. An annular connector is fixedly connected to the side of the annular plate 706 away from the compensating spring 705. Block 707, one end of the annular connecting block 707 is fixedly connected to a sealing ring 708, the outer surface of the sealing ring 708 is provided with a groove 709, the annular plate 706 and the annular connecting block 707 are both slidably sleeved in the inner wall of the annular groove 704. The structure in which the annular plate 706 and the annular connecting block 707 are slidably sleeved in the inner wall of the annular groove 704 can restrict the movement direction of the two, ensuring that they can only move along the axial direction of the annular groove 704, avoiding radial offset under the action of the compensating spring 705, thereby ensuring that the sealing ring 708 always moves along the sealing direction and maintains precise docking with the silicon carbide ceramic shell 702 and the Inconel nickel alloy protrusion 703.

[0027] Reference Figure 3 , Figure 4 and Figure 5The silicon carbide ceramic shell 702 and the Inconel nickel alloy protrusion 703 are inserted into the inner wall of the groove 709. This structure forms a radial sealing fit. Compared with traditional surface contact seals, this insertion fit can significantly increase the sealing contact length, extend the medium penetration path, and effectively block the medium from passing through the sealing gap. At the same time, the high surface smoothness of the silicon carbide ceramic shell 702 and its good fit with the inner wall of the groove 709 can reduce the sealing gap. The high strength of the Inconel nickel alloy protrusion 703 can prevent deformation of the sealing part during insertion, ensuring the stability of the insertion fit. In addition, this This plug-in structure can also resist the effects of vibration, prevent the sealing components from separating due to vibration, further improve the stability of the seal, and solve the problem of gaps easily appearing in the sealing structure under vibration conditions. Both ends of the Venturi tube section 1 are fixedly connected to the fixing brackets 2, and the valve stem 3 is installed between the two fixing brackets 2. The fixing brackets 2 at both ends of the Venturi tube section 1 can form bidirectional support for the valve stem 3, preventing axial displacement or shaking when the valve core module 5 moves. This bidirectional support structure can ensure that the valve stem 3 always stays in the central axis position of the Venturi tube section 1, thereby ensuring that the docking position of the valve core module 5 and the sealing component 7 is always accurate, providing a basic guarantee for the stability of the subsequent sealing effect.

[0028] Example 2: A sealing structure for a venturi valve, referring to... Figure 1 , Figure 2 and Figure 3 Based on the same concept as Embodiment 1 above, this embodiment proposes that a guide sleeve 4 is fitted on the outer surface of the valve stem 3, and a valve core module 5 is installed on the outer surface of the guide sleeve 4. A drive assembly 6 is provided at one end of the valve core module 5. The guide sleeve 4 on the outer surface of the valve stem 3 can restrict the movement direction of the valve stem 3, prevent the valve stem 3 from radially swinging when moving up and down, and ensure that the valve core module 5 always maintains a stable posture when moving with the guide sleeve 4. The drive assembly 6 at one end of the valve core module 5 can provide a stable power source for easy use. The drive assembly 6 includes a mounting bracket 6 fixedly connected to the outer surface of the venturi tube section 1. 01. An electric push rod 602 is hinged to the top of the mounting bracket 601. A connecting rod 603 is hinged to the output end of the electric push rod 602. The mounting bracket 601 can stably fix the electric push rod 602 on the outer surface of the Venturi tube section 1, preventing the electric push rod 602 from shifting during operation and ensuring stable power output direction. The connecting rod 603 hinged to the output end of the electric push rod 602 can flexibly transmit power and can adapt to the angle changes between the electric push rod 602 and subsequent transmission components, avoiding jamming during power transmission and ensuring that the power of the drive component 6 can be smoothly transmitted to the valve core module 5.

[0029] Reference Figure 2 , Figure 3 and Figure 5A sealing seat 604 is installed on the inner wall of the Venturi tube section 1. The connecting rod 603 is hinged in the inner wall of the sealing seat 604. The sealing seat 604 on the inner wall of the Venturi tube section 1 can provide fixed support for the connecting rod 603, limit the range of motion of the connecting rod 603, prevent excessive swinging of the connecting rod 603 when transmitting power, and ensure the stability of the power transmission path. At the same time, the hinged fit between the inner wall of the sealing seat 604 and the connecting rod 603 can reduce frictional loss between the two, extend the service life of the components, and thus ensure the stability of the drive assembly. The power of component 6 is precisely transmitted to subsequent components. A transmission rod 605 is hinged to the bottom end of the sealing seat 604. The end of the transmission rod 605 away from the connecting rod 603 is hinged to the outer surface of the guide sleeve 4. The transmission rod 605 hinged to the bottom end of the sealing seat 604 can build a power transmission bridge between the sealing seat 604 and the guide sleeve 4, so that the power of the drive component 6 can be smoothly transmitted to the guide sleeve 4 through the connecting rod 603, the sealing seat 604, and the transmission rod 605. This ensures that the guide sleeve 4 drives the valve core module 5 to move with uniform force. The implementation principle of this application embodiment is as follows: First, the drive component 6 provides power, and the mounting bracket 601 fixed on the outer surface of the Venturi tube section 1 will stably support the electric push rod 602. After the electric push rod 602 is started, its output end drives the hinged connecting rod 603 to move. The connecting rod 603 rotates flexibly in the sealing seat 604 on the inner wall of the Venturi tube section 1, and transmits the power to the transmission rod 605 hinged at the bottom end of the sealing seat 604. The transmission rod 605 then drives the guide sleeve 4 hinged thereto to move. Since the guide sleeve 4 is fitted on the outer surface of the valve stem 3, and the valve stem 3 is bidirectionally supported by the fixing brackets 2 at both ends inside the Venturi tube section 1, it can always remain in the central axis position. Therefore, the guide sleeve 4 will drive the valve core module 5 mounted on the outer surface to move smoothly along the axial direction of the Venturi tube section 1. As the valve core module 5 moves, the compensating spring 705 in the annular groove 704 fixed on its outer surface will push the annular plate 706. The annular plate 706 will then drive the annular connecting block 707 and the end sealing ring 708 to gradually approach the sealing assembly 7, until the groove 709 on the outer surface of the sealing ring 708 and the baffle 701... The silicon carbide ceramic housing 702 on one side and the internally embedded Inconel nickel alloy bump 703 are precisely interlocked to form a tight multi-layer seal. In subsequent use, if the sealing ring 708 experiences slight wear due to friction, the compensating spring 705 will continuously push the annular plate 706 and the annular connecting block 707, causing the sealing ring 708 to move in the sealing direction to compensate for the wear. The high strength of the Inconel nickel alloy bump 703 and the wear resistance of the silicon carbide ceramic housing 702 can resist the impact of media pressure and vibration, always maintaining a stable sealing effect and ensuring that the Venturi valve accurately controls the air volume.

Claims

1. A sealing structure for a venturi valve, comprising a venturi tube section (1), a valve core module (5), and a sealing assembly (7), characterized in that: The valve core module (5) is installed inside the venturi section (1). The sealing assembly (7) includes a baffle (701) fixedly connected to the inner wall of the venturi section (1). A silicon carbide ceramic shell (702) is fixedly connected to one side of the baffle (701). An Inconel alloy bump (703) is embedded inside the silicon carbide ceramic shell (702). The outer surface of the valve core module (5) is fixedly connected to an annular groove (704), and a compensation spring (705) is sleeved on the inner wall of the annular groove (704). The other end of the compensation spring (705) is fixedly connected to an annular plate (706). An annular connecting block (707) is fixedly connected to the side of the annular plate (706) away from the compensation spring (705). A sealing ring (708) is fixedly connected to one end of the annular connecting block (707), and a groove (709) is opened on the outer surface of the sealing ring (708).

2. The sealing structure of a venturi valve according to claim 1, characterized in that: Both ends of the Venturi tube section (1) are fixedly connected to a fixing frame (2), and a valve stem (3) is installed between the two fixing frames (2).

3. The sealing structure of a venturi valve according to claim 2, characterized in that: The outer surface of the valve stem (3) is fitted with a guide sleeve (4), and the outer surface of the guide sleeve (4) is fitted with a valve core module (5). One end of the valve core module (5) is provided with a drive assembly (6).

4. The sealing structure of a venturi valve according to claim 3, characterized in that: The drive assembly (6) includes a mounting bracket (601) fixedly connected to the outer surface of the venturi tube section (1), with an electric push rod (602) hinged to the top of the mounting bracket (601) and a connecting rod (603) hinged to the output end of the electric push rod (602).

5. The sealing structure of a venturi valve according to claim 4, characterized in that: The inner wall of the Venturi tube section (1) is fitted with a sealing seat (604), and the connecting rod (603) is hinged in the inner wall of the sealing seat (604).

6. The sealing structure of a venturi valve according to claim 5, characterized in that: The bottom end of the sealing seat (604) is hinged to a transmission rod (605), and the end of the transmission rod (605) away from the connecting rod (603) is hinged to the outer surface of the guide sleeve (4).

7. The sealing structure of a venturi valve according to claim 1, characterized in that: The annular plate (706) and the annular connecting block (707) are both slidably fitted in the inner wall of the annular groove (704).

8. The sealing structure of a venturi valve according to claim 1, characterized in that: The silicon carbide ceramic shell (702) and the Inconel nickel alloy bump (703) are inserted into the inner wall of the groove (709).

Images