Double-guiding axial flow valve structure

Abstract

This utility model provides a dual-guided axial flow valve structure, including: a valve body, a valve seat, a valve plug, and a drive mechanism; a first sealing pair disposed on the valve body for sealing with the outer wall of the valve plug; a first guide portion disposed on the outer wall of the valve plug, which cooperates with the first sealing pair to guide the rear end of the valve plug; and a second guide portion disposed on the valve body at the medium outlet, which cooperates with the outer wall of the valve plug to guide the front end of the valve plug. The first guide portion guides the rear end of the valve plug along the axial direction of the valve body; the second guide portion guides the front end of the valve plug along the axial direction of the valve body. This application, through a dual-guided design combining front and rear end guidance, effectively extends the guiding distance, fundamentally solving the defects of traditional axial flow valves, such as the guide position being too far back and insufficient support. This significantly improves the sealing alignment accuracy between the valve plug and the valve seat, reducing the risk of internal leakage.

Description

Technical Field

[0001] This utility model relates to the field of axial flow valve technology, and in particular to a dual-guide axial flow valve structure. Background Technology

[0002] In the field of fluid control, axial flow valves are widely used in various industries such as petroleum, chemical, and energy due to their unique fluid flow characteristics.

[0003] However, existing axial flow valves have significant structural design flaws. Some axial flow valves use a bottom-guided valve plug design. When the valve is closed, the guide structure is positioned too far back, failing to provide effective guidance and support for the valve plug. This makes it difficult to precisely align the valve plug sealing surface with the valve seat, leading to internal leakage and severely affecting the valve's sealing performance and control accuracy. Summary of the Invention

[0004] This invention provides a dual-guide axial flow valve structure to solve the problem that existing axial flow valves use bottom-guided valve plugs. When the valve is closed, the guide structure is positioned too far back and cannot provide effective guidance support for the valve plug, making it difficult to accurately align the valve plug sealing surface with the valve seat, which in turn leads to internal leakage.

[0005] This utility model provides a dual-guide axial flow valve structure, comprising:

[0006] The valve body has a medium inlet and a medium outlet arranged sequentially along the axial direction, and a valve seat is provided on the valve body at the medium outlet;

[0007] A valve plug is slidably disposed in the valve body, and the valve plug is used to cooperate with the valve seat to seal the medium outlet;

[0008] A first sealing pair is disposed on the valve body and is used to cooperate with the outer wall of the valve plug for sealing.

[0009] A drive mechanism is used to drive the valve plug to move axially along the valve body to open or seal the medium outlet;

[0010] A first guide portion is disposed on the outer wall of the valve plug, and the first guide portion cooperates with the first sealing pair to guide the rear end of the valve plug to move.

[0011] A second guide portion is disposed on the valve body and located at the medium outlet. The second guide portion is used to cooperate with the outer wall of the valve plug to guide the movement of the front end of the valve plug.

[0012] In one embodiment of the present invention, the valve body includes an outer valve body and an inner valve body, the medium outlet and the medium inlet are disposed on the outer valve body, a medium flow channel is formed between the outer wall of the inner valve body and the inner wall of the outer valve body, and the valve plug is slidably connected to the inner valve body.

[0013] In one embodiment of the present invention, the first sealing pair is disposed on the inner valve body, and the first sealing pair includes a first sealing ring, a pressure ring and a retaining ring arranged sequentially along the axial direction of the valve body, and the first sealing ring is slidably engaged with the first guide portion.

[0014] In one embodiment of the present invention, the first guide portion is formed by radial welding on the outer wall of the valve plug, and the first guide portion extends axially along the valve plug.

[0015] In one embodiment of the present invention, the outer valve body is provided with a gasket at the medium outlet, and the gasket is welded and fixed to the inner wall of the outer valve body.

[0016] In one embodiment of this utility model, the valve seat is bolted to the washer.

[0017] In one embodiment of the present invention, the second guide portion is connected between the washer and the valve seat.

[0018] In one embodiment of the present invention, a second sealing ring is provided between the second guide portion and the gasket.

[0019] In one embodiment of the present invention, a third sealing ring is provided between the second guide portion and the valve seat.

[0020] In one embodiment of the present invention, the valve plug is provided with a rat cage portion, which is used to connect the medium flow channel and the medium outlet.

[0021] The beneficial effects of this utility model are as follows: This utility model proposes a dual-guide axial flow valve structure. A first guide portion, located on the outer wall of the valve plug's rear end, guides the rear end of the valve plug to move axially along the valve body. A second guide portion, located at the medium outlet of the valve body and engaging with the outer wall of the valve plug's front end, guides the front end of the valve plug to move axially along the valve body. This application, through its dual-guide design combining front and rear guidance, effectively extends the guiding distance and moves the guiding point closer to the valve seat. This fundamentally solves the defects of traditional axial flow valves, such as the guide position being too far back and insufficient support. It significantly improves the sealing alignment accuracy between the valve plug and the valve seat, reduces the risk of internal leakage, and thus effectively improves the valve's sealing performance and control accuracy. 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. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] In the attached diagram:

[0024] Figure 1 This is a cross-sectional schematic diagram of a dual-guide axial flow valve structure provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the structure of section A in the middle;

[0026] Figure 3 for Figure 1 Enlarged schematic diagram of the structure of section B in the middle.

[0027] The attached figures are labeled as follows:

[0028] Valve body 1, outer valve body 101, medium inlet 101a, medium outlet 101b, inner valve body 102, second guide part 103, valve seat 2, valve plug 3, first guide part 301, squirrel cage part 302, first sealing pair 4, first sealing ring 401, pressure ring 402, retaining ring 403, medium flow channel 5, gasket 6, bolt 7, second sealing ring 8, third sealing ring 9. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0032] Please combine Figures 1 to 3 As shown, this utility model provides a dual-guide axial flow valve structure.

[0033] In one exemplary embodiment of this application, the dual-guided axial flow valve structure includes:

[0034] The valve body 1 has a medium inlet 101a and a medium outlet 101b arranged sequentially along the axial direction, and a valve seat 2 is provided on the valve body 1 at the medium outlet 101b.

[0035] Valve plug 3 is slidably disposed inside valve body 1. Valve plug 3 is used to cooperate with valve seat 2 to seal medium outlet 101b.

[0036] The first sealing pair 4 is disposed on the valve body 1 and is used to seal with the outer wall of the valve plug 3.

[0037] A drive mechanism is used to drive the valve plug 3 to move axially along the valve body 1 to open or seal the medium outlet 101b.

[0038] The first guide part 301 is disposed on the outer wall of the valve plug 3. The first guide part 301 cooperates with the first sealing pair 4 to guide the rear end of the valve plug 3 to move.

[0039] The second guide portion 103 is disposed on the valve body 1 and located at the medium outlet 101b. The second guide portion 103 is used to cooperate with the outer wall of the valve plug 3 to guide the movement of the front end of the valve plug 3.

[0040] In this embodiment, the first sealing pair 4 is installed inside the valve body 1 and close to the rear end of the valve plug 3. The first sealing pair 4 contacts the outer wall of the valve plug 3, achieving both sealing and providing a guide track for the first guide part 301. The first guide part 301, located on the outer wall of the rear end of the valve plug 3, guides the rear end of the valve plug 3 to move axially along the valve body 1. The second guide part 103, located at the medium outlet 101b of the valve body 1, cooperates with the outer wall of the front end of the valve plug 3, thereby guiding the front end of the valve plug 3 to move axially along the valve body 1. This application, through a dual guide design combining front-end and rear-end guidance, effectively extends the guide distance and moves the guide point forward to the vicinity of the valve seat 2. This fundamentally solves the defects of traditional axial flow valves, such as the guide position being too far back and insufficient support. It can significantly improve the sealing alignment accuracy between the valve plug 3 and the valve seat 2, reduce the risk of internal leakage, and thus effectively improve the valve sealing performance and control accuracy.

[0041] In an exemplary embodiment of this application, the valve body 1 includes an outer valve body 101 and an inner valve body 102. A medium outlet 101b and a medium inlet 101a are disposed on the outer valve body 101. A medium flow channel 5 is formed between the outer wall of the inner valve body 102 and the inner wall of the outer valve body 101. The valve plug 3 is slidably connected to the inner valve body 102.

[0042] In this embodiment, the drive mechanism includes an actuator and a valve stem. A bushing is provided inside the inner valve body 102, and the valve stem passes through the inner valve body 102 and is rotatably connected to the bushing. A crank-slider mechanism is connected between the valve stem and the valve plug 3 to realize the valve stem driving the valve plug 3 to move axially along the valve body 1. The actuator can be manual (including but not limited to handwheels), electric, or pneumatic.

[0043] In an exemplary embodiment of this application, a first sealing pair 4 is disposed on the inner valve body 102. The first sealing pair 4 includes a first sealing ring 401, a pressure ring 402 and a retaining ring 403 arranged sequentially along the axial direction of the valve body 1. The first sealing ring 401 is slidably engaged with the first guide portion 301.

[0044] In this embodiment, the first guide portion 301 (the weld overlay on the outer wall of the valve plug 3) and the first sealing ring 401 slide together to form a composite interface for guiding and sealing. Furthermore, the guide surface of the weld overlay has a lower coefficient of friction than traditional cast iron guide surfaces, resulting in less resistance to the movement of the valve plug 3. The first sealing ring 401 provides an initial seal, the pressure ring 402 ensures a uniform distribution of the sealing pressure, and the retaining ring 403 prevents high-pressure extrusion, forming a flexible-rigid-flexible three-layer protection. When the valve plug 3 reciprocates, the combined structure of the pressure ring 402 and the retaining ring 403 suppresses the creeping phenomenon of the first sealing ring 401.

[0045] It is worth noting that when the valve plug 3 and the valve seat 2 cooperate to close the medium passage, the first sealing ring 401 is used to seal the gap between the valve plug 3 and the inner valve seat 2, so as to prevent the medium in the medium flow channel 5 from entering the inner valve seat 2 through the gap between the valve plug 3 and the inner valve seat 2, and then leaking from the medium outlet 101b through the valve plug 3.

[0046] In an exemplary embodiment of this application, a first guide portion 301 is formed radially on the outer wall of the valve plug 3 by welding, and the first guide portion 301 extends axially along the valve plug 3.

[0047] In this embodiment, by radially overlaying an alloy on the outer wall of the valve plug 3, and the overlaying alloy extending along the axial direction of the valve plug 3, without changing the original structure, the alloy can form a guiding sealing interface with the first sealing ring 401 by simply overlaying an alloy on the outer wall of the valve plug 3, thereby effectively extending the contact guiding surface between the valve plug 3 and the first sealing ring 401 and improving the stability of the valve plug 3 during movement.

[0048] In an exemplary embodiment of this application, an outer valve body 101 is provided with a gasket 6 at the medium outlet 101b, and the gasket 6 is welded and fixed to the inner wall of the outer valve body 101.

[0049] In this embodiment, a gasket 6 is welded to the outer valve body 101 near the medium outlet 101b to provide an installation base for the valve seat 2. The welded and fixed gasket 6 can ensure the coaxiality of the valve seat 2 after installation and optimize the sealing fit accuracy.

[0050] In an exemplary embodiment of this application, the valve seat 2 is connected to the washer 6 by bolts 7.

[0051] In this embodiment, when the valve seat 2 needs to be replaced due to wear, the valve seat 2 can be removed simply by unscrewing the bolts 7, without damaging the structure of the outer valve body 101.

[0052] In an exemplary embodiment of this application, the second guide portion 103 is connected between the gasket 6 and the valve seat 2.

[0053] In this embodiment, the second guide portion 103 is made of metal and forms a guide and a metal hard seal by rigidly contacting the valve plug 3.

[0054] In an exemplary embodiment of this application, a second sealing ring 8 is provided between the second guide portion 103 and the gasket 6.

[0055] In this embodiment, when the medium outlet 101b is closed, the medium in the medium flow channel 5 is prevented from entering the bolt 7 connection position between the valve body 1 and the gasket 6 through the gap between the second guide part 103 and the gasket 6, thereby preventing the medium from leaking from the bolt 7 connection position between the valve body 1 and the gasket 6.

[0056] In an exemplary embodiment of this application, a third sealing ring 9 is provided between the second guide portion 103 and the valve seat 2.

[0057] In this embodiment, the third sealing ring 9 contacts and engages with the valve plug 3 to seal the medium outlet 101b.

[0058] It is worth noting that the second guide part 103, the second sealing ring 8, and the third sealing ring 9 are connected to the valve seat 2 and the gasket 6 by bolts 7, which provide preload force so that they can be installed between the valve seat 2 and the gasket 6. When the valve is closed, the medium impacts the second guide part 103, causing the second guide part 103 to squeeze the third sealing ring 9, further improving the sealing effect between the third sealing ring 9 and the valve plug 3, thereby reducing the risk of leakage.

[0059] In an exemplary embodiment of this application, the valve plug 3 is provided with a cage portion 302, which is used to connect the medium flow channel 5 and the medium outlet 101b.

[0060] In this embodiment, the cage portion 302 has multiple holes distributed circumferentially. The holes are strip-shaped holes extending axially along the valve body 1. When the valve is opened, the cage portion 302 gradually enters the interior of the outer valve body 101. The strip-shaped holes are connected to the medium flow channel 5. The more part of the cage portion 302 enters the interior of the outer valve body 101, the larger the valve opening. Conversely, when closed, the more part of the cage portion 302 is located outside the outer valve body 101, the smaller the valve opening.

[0061] The working principle involves guiding the rear end of the valve plug 3 along the axial direction of the valve body 1 via a first guide part 301 located on the outer wall of the rear end of the valve plug 3; and guiding the front end of the valve plug 3 along the axial direction of the valve body 1 via a second guide part 103 located at the medium outlet 101b of the valve body 1, which cooperates with the outer wall of the front end of the valve plug 3. This application, through a dual-guide design combining front and rear guidance, effectively extends the guiding distance and moves the guiding point forward to near the valve seat 2, fundamentally solving the defects of traditional axial flow valves, such as the rearward guiding position and insufficient support. This significantly improves the sealing alignment accuracy between the valve plug 3 and the valve seat 2, reduces the risk of internal leakage, and thus effectively improves the valve's sealing performance and control accuracy.

[0062] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A dual-guided axial flow valve structure, characterized in that, include: The valve body has a medium inlet and a medium outlet arranged sequentially along the axial direction, and a valve seat is provided on the valve body at the medium outlet; A valve plug is slidably disposed in the valve body, and the valve plug is used to cooperate with the valve seat to seal the medium outlet; A first sealing pair is disposed on the valve body and is used to cooperate with the outer wall of the valve plug for sealing. A drive mechanism is used to drive the valve plug to move axially along the valve body to open or seal the medium outlet; A first guide portion is disposed on the outer wall of the valve plug, and the first guide portion cooperates with the first sealing pair to guide the rear end of the valve plug to move. A second guide portion is disposed on the valve body and located at the medium outlet. The second guide portion is used to cooperate with the outer wall of the valve plug to guide the movement of the front end of the valve plug.

2. The dual-guide axial flow valve structure according to claim 1, characterized in that: The valve body includes an outer valve body and an inner valve body. The medium outlet and the medium inlet are disposed on the outer valve body. A medium flow channel is formed between the outer wall of the inner valve body and the inner wall of the outer valve body. The valve plug is slidably connected to the inner valve body.

3. The dual-guide axial flow valve structure according to claim 2, characterized in that: The first sealing pair is disposed on the inner valve body. The first sealing pair includes a first sealing ring, a pressure ring and a retaining ring arranged sequentially along the axial direction of the valve body. The first sealing ring is slidably engaged with the first guide portion.

4. The dual-guide axial flow valve structure according to claim 3, characterized in that: The first guide portion is formed radially on the outer wall of the valve plug by welding, and the first guide portion extends axially along the valve plug.

5. The dual-guide axial flow valve structure according to claim 2, characterized in that: The outer valve body is provided with a gasket at the medium outlet, and the gasket is welded and fixed to the inner wall of the outer valve body.

6. The dual-guide axial flow valve structure according to claim 5, characterized in that: The valve seat is bolted to the washer.

7. The dual-guide axial flow valve structure according to claim 6, characterized in that: The second guide portion is connected between the gasket and the valve seat.

8. The dual-guide axial flow valve structure according to claim 7, characterized in that: A second sealing ring is provided between the second guide portion and the gasket.

9. The dual-guide axial flow valve structure according to claim 7, characterized in that: A third sealing ring is provided between the second guide portion and the valve seat.

10. The dual-guide axial flow valve structure according to claim 2, characterized in that: The valve plug is provided with a rat cage, which is used to connect the medium flow channel and the medium outlet.

Images