CN218118637U

CN218118637U - External sealing type pneumatic butterfly valve

Info

Publication number: CN218118637U
Application number: CN202222163939.2U
Authority: CN
Inventors: 朱振华
Original assignee: Wuxi Xinming Automatic Control Valve Co ltd
Current assignee: Wuxi Xinming Automatic Control Valve Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-12-23
Anticipated expiration: 2032-08-17

Abstract

The utility model discloses an external seal formula pneumatic butterfly valve, including the pneumatic actuator, support and the disk seat that connect gradually, pneumatic actuator's output pole stretches into in the disk seat, pneumatic actuator is last to be equipped with the case with disk seat sealing connection, the disk seat both ends are connected with the connecting pipe, at least one side of case is connected with seal assembly, seal assembly is including connecting the crank link mechanism on the case and the end cap of being connected with crank link mechanism, the end cap activity is established in the connecting pipe, the front end of connecting pipe has the opening, the case rotates and makes end cap and opening contact or separation through crank link drive end cap back-and-forth movement to open or close pneumatic butterfly valve. In this way, the utility model discloses outer sealed pneumatic butterfly valve can seal up through end cap and connecting pipe, thereby the end cap follows the rotation of case through the crank connecting rod structure and opens or close the valve body, simple structure, and is sealed effectual.

Description

External sealing type pneumatic butterfly valve

Technical Field

The utility model relates to a pneumatic butterfly valve field especially relates to an external seal formula pneumatic butterfly valve.

Background

The pneumatic butterfly valve consists of a pneumatic actuator and a butterfly valve. The pneumatic butterfly valve is opened and closed by a circular butterfly plate rotating along with a valve rod to realize the pneumatic valve which starts to act, is mainly used as a cut-off valve, can also be designed to have the function of adjusting or adjusting a section valve, and is increasingly used on low-pressure large-caliber and medium-caliber pipelines.

Among the prior art, the in-process that the pneumatic butterfly valve was closing, the pneumatic butterfly valve does not possess self sealss function for the circular butterfly plate among the pneumatic butterfly valve receives the pressure of water, and the circular butterfly plate is after long-time pressurized, and its self seal assembly is impaired, makes aqueous solution go out from impaired seal assembly gap and flows out among the pneumatic butterfly valve, and then has damaged the leak protection performance of pneumatic butterfly valve, is unfavorable for the normal work of pneumatic butterfly valve. Although some pneumatic butterfly valves improve the sealing effect by adding a sealing structure between the valve core and the valve body, the frequent rotation of the valve core can cause the abrasion of the sealing structure, and the sealing effect is difficult to ensure after long-term use.

Disclosure of Invention

The utility model discloses the main technical problem who solves provides an external seal formula pneumatic butterfly valve, can seal through end cap and connecting pipe, thereby the end cap follows the rotation of case through the crank connecting rod structure and opens or close the valve body, simple structure, and is sealed effectual.

In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides an external seal formula pneumatic butterfly valve, including the pneumatic actuator, support and the disk seat that connect gradually, the output pole of pneumatic actuator stretches into in the disk seat, be equipped with the case with disk seat sealing connection on the pneumatic actuator, the disk seat both ends are connected with the connecting pipe, at least one side of case is connected with seal assembly, seal assembly is including connecting the crank link mechanism on the case and the end cap of being connected with crank link mechanism, the end cap activity is established in the connecting pipe, the front end of connecting pipe has the opening, the case rotates and makes end cap and opening contact or separation through crank link drive end cap back-and-forth movement to open or close pneumatic butterfly valve.

In a preferred embodiment of the present invention, the front end of the plug has a tapered surface, and the plug contacts the opening through the tapered surface to close the opening.

In a preferred embodiment of the present invention, a sealing assembly is further disposed on the plug, the sealing assembly includes a first sealing ring and a second sealing ring embedded on the conical surface, the first sealing ring and the second sealing ring seal the opening, the plug is connected to the opening to make the second sealing ring inside the opening, and the first sealing ring outside the opening.

In a preferred embodiment of the present invention, the outer ring of the first seal ring contacts with the inner wall of the opening to seal the opening, and the right end face of the second seal ring contacts with the left end face of the opening to seal the opening.

In a preferred embodiment of the present invention, the connecting pipe has a passage inside, the lower end of the plug is provided with a pulley, the lower end of the plug is movably connected in the connecting pipe through the pulley, and a gap is formed between the plug and the passage.

In a preferred embodiment of the present invention, the lower end of the channel is provided with a sliding groove corresponding to a pulley, and the pulley is located at the lower end of the center of the plug.

In a preferred embodiment of the present invention, the crank mechanism comprises a first connecting rod and a second connecting rod, the left end of the first connecting rod is hinged to the right side of the center of the valve core, the right end of the first connecting rod is hinged to the second connecting rod, and the second connecting rod, the center of the valve core and the center of the plug are coaxially disposed.

In a preferred embodiment of the present invention, the sealing assembly is symmetrically disposed on the left and right sides of the valve core.

The utility model has the advantages that: the utility model discloses the conventional seal structure of pneumatic butterfly valve has been changed to outer sealed formula pneumatic butterfly valve, realizes pneumatic butterfly valve's sealed through external connecting pipe and end cap, effectively avoids case department to appear leaking.

The utility model discloses outer sealed pneumatic butterfly valve passes through crank link mechanism with the case and is connected with the end cap, thereby rotates through the case and drives opening and closing that end cap axial displacement realized the case of end cap axial displacement, on the basis that does not change pneumatic butterfly valve fundamental principle, realizes opening and closing the effect by case, end cap and crank link mechanism.

The utility model discloses outer sealed formula pneumatic butterfly valve is sealed by realizing between end cap and the opening, and the conical surface through the end cap forms basic contact surface with the opening and seals, is sealed by first sealing washer and second sealing washer formation between end cap and open-ended inboard and the outside again, and multiple sealed guaranteeing sealed respond well between end cap and the opening.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic view of the outer seal type pneumatic butterfly valve according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a portion of the structure of FIG. 1;

FIG. 3 is a partial schematic view of the structure of FIG. 1;

the parts in the drawings are numbered as follows: 1. the pneumatic actuator comprises a pneumatic actuator, 2, a support, 3, a valve seat, 31, a connecting pipe, 311, a channel, 312, an opening, 4, a valve core, 5, a sealing component, 51, a plug, 511, a conical surface, 512, a first sealing ring, 513, a second sealing ring, 514, a pulley, 52, a crank connecting rod structure, 521, a first connecting rod, 522 and a second connecting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. The structure, proportion, size and so on shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions of the present invention, so that the present invention does not have the essential significance in the technology, and any structure modification, proportion relation change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and the achievable by the present invention. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Referring to fig. 1, the outer sealed pneumatic butterfly valve includes a pneumatic actuator 1, a bracket 2 and a valve seat 3, which are connected in sequence, wherein an output rod of the pneumatic actuator 1 extends into the valve seat 3, and a valve core 4 hermetically connected with the valve seat 3 is arranged on the pneumatic actuator 1. The pneumatic actuator 1 is an existing conventional pneumatic actuator and can act at 0-180 degrees. The support is a connecting piece, and a conventional metal connecting piece is selected. The valve core 4, the valve seat 3 and the like are conventional structures in the field.

The two ends of the valve seat 3 are connected with connecting pipes 31, and at least one side of the valve core 4 is connected with a sealing component 5. The sealing assembly 5 comprises a crank connecting rod mechanism connected to the valve core 4 and a plug 51 connected with the crank connecting rod mechanism 52, and the plug 51 is movably arranged in the connecting pipe 31. The front end of the connecting pipe 31 is provided with an opening 312, and the valve core 4 rotates to drive the plug 51 to move back and forth through the crank connecting rod, so that the plug 51 is contacted with or separated from the opening 312, and the pneumatic butterfly valve is opened or closed. The crank-link mechanism comprises a first connecting rod 521 and a second connecting rod 522, the left end of the first connecting rod 521 is hinged to the positive side of the center of the valve core 4, the right end of the first connecting rod 521 is hinged to the second connecting rod 522, and the second connecting rod 522, the center of the valve core 4 and the center of the plug 51 are coaxially arranged. As shown in fig. 3, when the pneumatic actuator 1 is started, the output rod of the pneumatic actuator 1 drives the valve core 4 to rotate, and after the valve core 4 rotates, because the first connecting rod 521 is hinged on the valve core 4, the first connecting rod 521 is driven by the rotation of the valve core 4 to move leftward, and simultaneously the second connecting rod 522 is pulled backward, which is that the plug 51 starts to move backward, the plug 51 is separated from the opening 312, and the pneumatic butterfly valve is opened. When the valve core 4 rotates reversely, the crank connecting rod drives the plug 51 to reset, the plug 51 plugs the opening 312 again, and the pneumatic butterfly valve is closed.

The front end of the plug 51 has a tapered surface 511, and the plug 51 contacts the opening 312 through the tapered surface 511 to close the opening 312. The conical surface has small sealing contact area and good sealing effect. In addition, due to the pressure of the medium, the closing speed is low due to the action of the medium in the closing process, the collision between the plug 51 and the opening 312 due to the over-high speed of the plug 51 is avoided, the abrasion is small, and the service life is effectively prolonged.

As shown in fig. 2, the plug 51 is further provided with a sealing assembly 5, the sealing assembly 5 includes a first sealing ring 512 and a second sealing ring 513 embedded on the tapered surface 511, the first sealing ring 512 and the second sealing ring 513 are connected with the opening 312 to seal the opening 312, the plug 51 is connected with the opening 312 so that the second sealing ring 513 is located inside the opening 312, and the first sealing ring 512 is located outside the opening 312. The outer ring of the first seal ring 512 contacts the inner wall of the opening 312 to seal the opening 312, and the right end surface of the second seal ring 513 contacts the left end surface of the opening 312 to seal the opening 312. In a sealed state, the first sealing ring 512 is tightly attached to the inner wall of the opening 312 to realize a sealing function, and as a first sealing structure, the plug 51 and the opening 312 form a second sealing structure. The first sealing structure and the second sealing structure are axial seals. The first sealing ring 512 is made of wear-resistant sealing ring, and the first sealing ring 512 can still ensure the sealing effect when the plug 51 is slightly worn. The second seal 513 forms a circumferential seal with the end face on the left side of the opening 312. After the plug 51 is slightly worn, the second sealing ring 513 forms a third sealing structure outside the worn part of the plug 51 and the opening 312, so as to further prevent leakage from occurring at the plug 51 and the opening 312.

The connecting pipe 31 has a passage 311 therein, the lower end of the plug 51 is provided with a pulley 514, the lower end of the plug 51 is movably connected in the connecting pipe 31 through the pulley 514, and the plug 51 and the passage 311 are arranged with a gap therebetween. The lower end of the passage 311 is provided with a sliding groove corresponding to the pulley 514, and the pulley 514 is located at the lower end of the center of the plug 51. The lower end of the plug 51 axially moves along the sliding groove of the connecting pipe 31 through the pulley 514, so that direct contact friction between the plug 51 and the inside of the connecting pipe 31 is avoided, and the wear of the plug 51 and the connecting pipe 31 is prevented. The plug 51 and the connecting tube 31 form a channel 311 for the medium to flow through. The pulley 514 can be replaced by a ball to also function as a sliding device.

The left side and the right side of the valve core 4 are provided with sealing components 5 in central symmetry. The sealing components 5 are arranged at two ends of the sealing device simultaneously to ensure bidirectional opening and closing, and the using effect is further improved. The application of the outer sealing type pneumatic butterfly valve is suitable for the working condition that the precision requirement is high and the flow demand is not high, can effectively guarantee the sealing effect under the working condition and is convenient for accurate control.

Be different from prior art, the utility model discloses outer sealed pneumatic butterfly valve can seal up through end cap and connecting pipe, thereby the end cap follows the rotation of case through the crank connecting rod structure and opens or close the valve body, simple structure, and is sealed effectual.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides an external seal formula pneumatic butterfly valve, is including the pneumatic actuator, support and the disk seat that connect gradually, the output pole of pneumatic actuator stretches into in the disk seat, be equipped with the case with disk seat sealing connection on the pneumatic actuator, the disk seat both ends are connected with the connecting pipe, its characterized in that, at least one side of case is connected with seal assembly, seal assembly is including connecting the crank link mechanism on the case and the end cap of being connected with crank link mechanism, the end cap activity is established in the connecting pipe, the front end of connecting pipe has the opening, the case rotates and makes end cap and opening contact or separation through crank link drive end cap back-and-forth movement to open or close pneumatic butterfly valve.

2. The external sealing pneumatic butterfly valve of claim 1, wherein the plug has a tapered surface at a front end thereof, and the plug contacts the opening via the tapered surface to close the opening.

3. The external sealing type pneumatic butterfly valve according to claim 2, wherein a sealing assembly is further arranged on the plug, the sealing assembly comprises a first sealing ring and a second sealing ring which are embedded on the conical surface, the first sealing ring and the second sealing ring are connected with the opening to seal the opening, the plug is connected with the opening to enable the second sealing ring to be located on the inner side of the opening, and the first sealing ring is located on the outer side of the opening.

4. The external sealed pneumatic butterfly valve of claim 3, wherein an outer ring of the first seal ring contacts an inner wall of the opening to seal the opening, and a right end face of the second seal ring contacts a left end face of the opening to seal the opening.

5. The external sealing type pneumatic butterfly valve according to claim 4, wherein a channel is formed inside the connecting pipe, a pulley is arranged at the lower end of the plug, the lower end of the plug is movably connected in the connecting pipe through the pulley, and a gap is formed between the plug and the channel.

6. The external sealing type pneumatic butterfly valve according to claim 5, wherein a sliding groove corresponding to a pulley is formed at the lower end of the channel, and the pulley is located at the lower end of the center of the plug.

7. The external sealing type pneumatic butterfly valve according to any one of claims 1 to 6, wherein the toggle linkage comprises a first connecting rod and a second connecting rod, the left end of the first connecting rod is hinged to the right side of the center of the valve core, the right end of the first connecting rod is hinged to the second connecting rod, and the second connecting rod, the center of the valve core and the center of the plug are coaxially arranged.

8. The external sealing type pneumatic butterfly valve according to claim 7, wherein the left side and the right side of the valve core are provided with the sealing assemblies in central symmetry.