Eccentric butterfly valve

Abstract

The utility model relates to an eccentric butterfly valve which comprises a valve body, an eccentric butterfly plate, a valve rod, an actuator and a valve seat assembly, one side of the valve body is fixedly connected with a connector seat, the valve seat assembly is located between the connector seat and the valve body and located on the outer side of the eccentric butterfly plate, and the valve seat assembly comprises a locating ring and a telescopic valve seat. The positioning ring is sleeved with the telescopic valve seat in a positioning mode and faces the eccentric butterfly plate, an L-shaped air channel is formed in the valve body, one end of the L-shaped air channel is connected with an inflation nozzle penetrating out of the valve body, the other end of the L-shaped air channel leads to the positioning ring, an inflation channel leading to the position between the positioning ring and the telescopic valve seat is formed in the positioning ring, and the inflation channel is communicated with the L-shaped air channel. After the eccentric butterfly plate is closed, the telescopic valve seat is inflated and expanded to be tightly sealed with the eccentric butterfly plate, and in the process that the eccentric butterfly plate is opened, closed and rotated, the telescopic valve seat is deflated firstly, at the moment, the telescopic valve seat is not in contact with the eccentric butterfly plate, and friction between sealing parts is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to an eccentric butterfly valve. Background Art

[0002] As a widely used flow control device, butterfly valves play a vital role in many industrial fields. They are favored for their compact structure, ease of operation, and low cost. However, traditional butterfly valve designs have inherent limitations, particularly in terms of sealing performance and service life.

[0003] Traditional butterfly valves typically utilize a fixed metal or rubber sealing ring on the valve seat to achieve sealing. When the disc is closed, the edge of the disc presses directly against the fixed seat, creating a seal. While this sealing method meets basic requirements, in practice, the constant physical contact between the disc and the valve seat, coupled with the disc's frequent opening and closing, causes friction that wears the valve seat, compromising the valve's overall sealing performance. Furthermore, wear of the seat material can generate tiny particles, which not only contaminate the medium but can also clog or damage the valve's internal structure.

[0004] To overcome these issues, the industry has tried various solutions, such as improving the valve seat sealing material, adopting more wear-resistant materials, or optimizing the butterfly plate design to reduce friction. However, these methods either increase manufacturing costs or fail to fundamentally solve the wear problem, resulting in no significant improvement in the long-term reliability of the valve. Utility Model Content

[0005] The utility model provides an eccentric butterfly valve, whose telescopic valve seat can form a good seal with the eccentric disc plate, and can prevent the eccentric disc plate from being worn when the eccentric disc plate rotates for opening and closing, thereby solving the above-mentioned problems existing in the use process of the prior art.

[0006] The technical solution of the present utility model is implemented as follows: an eccentric butterfly valve comprises a valve body, an eccentric disc plate, a valve stem, an actuator and a valve seat assembly, the actuator is fixedly mounted on the upper side of the valve body, the upper end of the valve stem is connected to the actuator, the lower end of the valve stem penetrates into the valve body and is fixedly connected to the eccentric disc plate, one side of the valve body is fixedly connected with an interface seat, the valve seat assembly is located between the interface seat and the valve body and is located on the outside of the eccentric disc plate, the valve seat assembly comprises a positioning ring and a telescopic valve seat, the telescopic valve seat positioning sleeve is arranged on the positioning ring and faces the eccentric disc plate, the valve body is provided with an L-shaped air duct, one end of the L-shaped air duct is connected to an inflation nozzle that penetrates the valve body, the other end of the L-shaped air duct leads to the positioning ring, the positioning ring is provided with an inflation duct leading to the position ring and the telescopic valve seat, and the inflation duct is connected to the L-shaped air duct.

[0007] Preferably, an accommodating cavity for accommodating the valve seat assembly is provided between the interface seat and the valve body, the telescopic valve seat penetrates the accommodating cavity on the side facing the eccentric disc plate, and a limiting step is provided on the telescopic valve seat on the side facing the eccentric disc plate. The limiting step is provided at a position of the telescopic valve seat close to the interface seat and the valve body, and a limiting plate is provided on the interface seat and the valve body on the limiting step.

[0008] Preferably, both the interface seat and the valve body are provided with a limit clamping platform on the accommodating cavity, which is located on the side of the telescopic valve seat away from the eccentric disc plate, and the limit clamping platform forms a support for the side of the telescopic valve seat away from the eccentric disc plate.

[0009] Preferably, a positioning connection port is provided in the telescopic valve seat with an opening toward the side away from the eccentric disc plate, the cross-section of the positioning connection port is convex, the positioning ring includes a connecting ring clamped in the positioning connection port, and the inflation channel passes through the connecting ring and enters the inner side of the positioning connection port.

[0010] Preferably, a concave groove is provided on the end surface of the connecting ring facing the inner side of the positioning connecting port, and the inflation channel is communicated with the concave groove.

[0011] Preferably, a first sealing sleeve is provided in the valve body, the valve stem is rotatably fitted in the first sealing sleeve, the lower end of the eccentric disc plate is fixedly connected to a positioning shaft, a positioning hole corresponding to the positioning shaft is opened on the valve body, a second sealing sleeve is provided in the positioning hole, and the positioning shaft is rotatably fitted in the second sealing sleeve.

[0012] Preferably, at least two first sealing rings are provided on the inner side of the first sealing sleeve and the second sealing sleeve, at least two second sealing rings are provided on the outer side of the first sealing sleeve and the second sealing sleeve, and the first sealing rings and the second sealing rings are arranged in an alternating manner.

[0013] In summary, the beneficial effects of the present invention are:

[0014] 1. The utility model can fill gas between the positioning ring and the telescopic valve seat through the inflation nozzle, the L-shaped air channel and the inflation channel, thereby expanding the telescopic valve seat. After the eccentric disc is closed, the telescopic valve seat is inflated and expanded to be tightly sealed with the eccentric disc. In the process of opening and closing the eccentric disc, the telescopic valve seat is first deflated. At this time, the telescopic valve seat does not contact the eccentric disc, and the rotation resistance distance of the eccentric disc is extremely small, thereby avoiding the friction between the telescopic valve seat and the eccentric disc. In this way, the telescopic valve seat will not be worn, and therefore will not fall off or slag, and the valve sealing performance is reliable.

[0015] 2. The interface seat and the valve body effectively limit the telescopic valve seat through the limit plate and the limit clamping table, so that when the telescopic valve seat expands, only the side that penetrates the accommodating cavity toward the eccentric disc plate can be expanded to contact and seal with the eccentric disc plate, with good structural reliability and high expansion efficiency.

[0016] 3. The telescopic valve seat is connected to the connecting ring on the positioning ring through a positioning connecting port with a convex cross-section. The structure is stable and not easy to fall off, and the inflation channel passes through the connecting ring and enters the inner side of the positioning connecting port. In this way, the telescopic valve seat can be effectively expanded toward the side of the eccentric disc plate penetrating out of the accommodating cavity, and the gas is not easy to leak.

[0017] 4. The setting of the concave groove enables the gas to expand the entire circle of the telescopic valve seat more quickly and evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure when observed from another angle;

[0021] Figure 3 It is a side view of the utility model;

[0022] Figure 4 for Figure 3 Schematic diagram of the cross-section structure in the AA direction;

[0023] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0024] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure in the BB direction.

[0025] In the figure: 1. Valve body; 11. L-shaped air duct; 12. Inflation nozzle; 13. Positioning hole; 2. Eccentric disc plate; 21. Positioning shaft; 3. Valve stem; 4. Actuator; 5. Interface seat; 6. Positioning ring; 61. Inflation duct; 62. Connecting ring; 63. Concave groove; 7. Telescopic valve seat; 71. Limiting step; 72. Positioning connection port; 81. Accommodating cavity; 82. Limiting plate; 83. Limiting clamp; 91. First sealing sleeve; 92; Second sealing sleeve; 93. First sealing ring; 94. Second sealing ring. DETAILED DESCRIPTION

[0026] The following is a combination of the appended examples of the present invention Figure 1-6 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Example:

[0028] like Figures 1 to 6 As shown, the utility model discloses an eccentric butterfly valve, which includes a valve body 1, an eccentric disc plate 2, a valve stem 3, an actuator 4 and a valve seat assembly, wherein the actuator 4 is fixedly mounted on the upper side of the valve body 1, and the upper end of the valve stem 3 is connected to the actuator 4. The actuator 4 is used to control the rotation of the valve stem 3. The actuator 4 is a prior art and will not be described here. The lower end of the valve stem 3 penetrates into the valve body 1 and is fixedly connected to the eccentric disc plate 2. In the utility model, an interface seat 5 is fixedly connected to one side of the valve body 1, and the valve seat assembly is located between the interface seat 5 and the valve seat assembly. The valve body 1 is located between the valve body 1 and on the outside of the eccentric disc plate 2. Specifically, the valve seat assembly includes a positioning ring 6 and a telescopic valve seat 7, wherein the telescopic valve seat 7 is positioned on the inner side of the positioning ring 6 and faces the eccentric disc plate 2. An L-shaped air duct 11 is opened on the valve body 1, and one end of the L-shaped air duct 11 is connected to an inflation nozzle 12 that penetrates the valve body 1. The other end of the L-shaped air duct 11 leads to the positioning ring 6, and an inflation duct 61 leading to the space between the positioning ring 6 and the telescopic valve seat 7 is opened on the positioning ring 6. The inflation duct 61 is connected to the L-shaped air duct 11.

[0029] When the present invention is in use, the inflation nozzle 12 can be externally connected to a solenoid valve and an air pump. During inflation, the solenoid valve opens, and the air pump inputs gas into the inflation nozzle 12. After the inflation is completed, the solenoid valve closes. Of course, the inflation nozzle 12 can also be manually inflated, and the inflation nozzle 12 is sealed after the inflation is completed. The present invention uses the inflation nozzle 12, the L-shaped air channel 11, and the inflation channel 61 to fill gas between the positioning ring 6 and the telescopic valve seat 7, thereby expanding the telescopic valve seat 7. After the eccentric disc 2 is closed, the telescopic valve seat 7 is inflated and tightly sealed with the eccentric disc 2. In the process of opening and closing the eccentric disc 2 and rotating, the telescopic valve seat 7 is first deflated. At this time, the telescopic valve seat 7 does not contact the eccentric disc 2, and the rotational resistance distance of the eccentric disc 2 is extremely small, thereby avoiding friction between the telescopic valve seat 7 and the eccentric disc 2. In this way, the telescopic valve seat 7 will not be worn, and therefore will not fall off or slag, and the valve sealing performance is reliable.

[0030] The specific structure of the valve seat assembly arranged between the interface seat 5 and the valve body 1 is as follows: an accommodating cavity 81 for accommodating the valve seat assembly is provided between the interface seat 5 and the valve body 1, and the telescopic valve seat 7 penetrates the accommodating cavity 81 on the side facing the eccentric disc plate 2, wherein a limiting step 71 is provided on the side of the telescopic valve seat 7 facing the eccentric disc plate 2, and the limiting step 71 is provided at a position of the telescopic valve seat 7 close to the interface seat 5 and the valve body 1, and a limiting plate 82 is provided on the interface seat 5 and the valve body 1, which is located on the limiting step 71. The setting of the limiting plate 82 can prevent the telescopic valve seat 7 from falling out of the accommodating cavity 81. In addition, the interface seat 5 and the valve body 1 are both provided with a limit clamp 83 on the accommodating cavity 81, which is located on the side of the telescopic valve seat 7 away from the eccentric disc plate 2. The limit clamp 83 forms a support for the side of the telescopic valve seat 7 away from the eccentric disc plate 2. In addition, the interface seat 5 and the valve body 1 also clamp the two sides of the telescopic valve seat 7. The structure of the interface seat 5 and the valve body 1, in conjunction with the limit plate 82 and the limit clamp 83, can effectively limit the telescopic valve seat 7, so that when the telescopic valve seat 7 expands, only the side that penetrates the accommodating cavity 81 toward the eccentric disc plate 2 can be expanded to contact and seal with the eccentric disc plate 2, with good structural reliability and high expansion efficiency.

[0031] The specific structure of the telescopic valve seat 7 positioning sleeve arranged on the positioning ring 6 is: a positioning connection port 72 is opened in the telescopic valve seat 7, the opening facing the side away from the eccentric disc plate 2, and the cross-section of the positioning connection port 72 is convex, and the positioning ring 6 includes a connecting ring 62 clamped in the positioning connection port 72. This structure can improve the structural strength of the telescopic valve seat 7 and the positioning ring 6, and prevent the telescopic valve seat 7 from being separated from the positioning ring 6. Furthermore, the inflation channel 61 passes through the connecting ring 62 and enters the inner side of the positioning connection port 72, so that during inflation, the telescopic valve seat 7 can be effectively expanded toward the side of the eccentric disc plate 2 that penetrates the accommodating cavity 81, and the gas is not easy to leak inside the positioning connection port 72.

[0032] Furthermore, a concave groove 63 is provided on the end face of the connecting ring 62 facing the inner side of the positioning connecting port 72. The concave groove 63 is arranged in a ring shape on the inner side of the connecting ring 62, and the inflation channel 61 is connected to the concave groove 63. The setting of the concave groove 63 enables the gas to expand the entire circle of the telescopic valve seat 7 more quickly and evenly.

[0033] In the present utility model, a first sealing sleeve 91 is fixedly provided in the valve body 1, and the valve stem 3 is rotatably fitted in the first sealing sleeve 91, and the lower end of the eccentric disc plate 2 is fixedly connected to the positioning shaft 21. A positioning hole 13 corresponding to the positioning shaft 21 is opened on the valve body 1, and a second sealing sleeve 92 is fixedly provided in the positioning hole 13, and the positioning shaft 21 is rotatably fitted in the second sealing sleeve 92.

[0034] Furthermore, at least two first sealing rings 93 are provided on the inner sides of the first sealing sleeve 91 and the second sealing sleeve 92, and at least two second sealing rings 94 are provided on the outer sides of the first sealing sleeve 91 and the second sealing sleeve 92. The first sealing rings 93 and the second sealing rings 94 are arranged in an alternating manner. The first sealing rings 93 and the second sealing rings 94 arranged in this way can effectively seal the first sealing sleeve 91 and the second sealing sleeve 92 with the valve body 1, and can also effectively seal the first sealing sleeve 91 with the valve stem 3, and can effectively seal the second sealing sleeve 92 with the positioning shaft 21.

[0035] It should also be pointed out that the terms indicated in the present invention, such as: "front", "rear", "vertical", "horizontal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An eccentric butterfly valve, comprising a valve body, an eccentric disc, a valve stem, an actuator, and a valve seat assembly, wherein the actuator is fixedly mounted on the upper side of the valve body, the upper end of the valve stem is connected to the actuator, and the lower end of the valve stem penetrates into the valve body and is fixedly connected to the eccentric disc, characterized in that: An interface seat is fixedly connected to one side of the valve body, and the valve seat assembly is located between the interface seat and the valve body and on the outside of the eccentric disc plate. The valve seat assembly includes a positioning ring and a telescopic valve seat. The telescopic valve seat positioning sleeve is arranged on the positioning ring and faces the eccentric disc plate. An L-shaped air channel is provided on the valve body, and one end of the L-shaped air channel is connected to an inflation nozzle that penetrates the valve body, and the other end of the L-shaped air channel leads to the positioning ring. The positioning ring is provided with an inflation channel leading to the space between the positioning ring and the telescopic valve seat, and the inflation channel is connected to the L-shaped air channel.

2. The eccentric butterfly valve according to claim 1, characterized in that: An accommodating cavity for accommodating the valve seat assembly is provided between the interface seat and the valve body, the telescopic valve seat penetrates the accommodating cavity on the side facing the eccentric disc plate, and a limiting step is provided on the telescopic valve seat on the side facing the eccentric disc plate. The limiting step is provided at a position of the telescopic valve seat close to the interface seat and the valve body, and a limiting plate is provided on the interface seat and the valve body on the limiting step.

3. The eccentric butterfly valve according to claim 2, characterized in that: The interface seat and the valve body are both provided with a limit clamping platform on the accommodating cavity, which is located on the side of the telescopic valve seat away from the eccentric disc plate. The limit clamping platform forms a support for the side of the telescopic valve seat away from the eccentric disc plate.

4. The eccentric butterfly valve according to claim 3, characterized in that: A positioning connection port is provided in the telescopic valve seat, the opening of which is toward the side away from the eccentric disc plate. The cross-section of the positioning connection port is convex-shaped. The positioning ring includes a connecting ring that is clamped in the positioning connection port. The inflation channel passes through the connecting ring and enters the inner side of the positioning connection port.

5. The eccentric butterfly valve according to claim 4, characterized in that: An annular concave groove is provided on the end surface of the connecting ring facing the inner side of the positioning connecting port, and the inflation channel is communicated with the concave groove.

6. The eccentric butterfly valve according to claim 1, characterized in that: A first sealing sleeve is provided in the valve body, the valve stem is rotatably fitted in the first sealing sleeve, the lower end of the eccentric disc is fixedly connected to a positioning shaft, a positioning hole corresponding to the positioning shaft is opened on the valve body, a second sealing sleeve is provided in the positioning hole, and the positioning shaft is rotatably fitted in the second sealing sleeve.

7. The eccentric butterfly valve according to claim 1, characterized in that: At least two first sealing rings are provided on the inner side of the first sealing sleeve and the second sealing sleeve, and at least two second sealing rings are provided on the outer side of the first sealing sleeve and the second sealing sleeve, and the first sealing rings and the second sealing rings are arranged in an alternating manner.

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