A polytetrafluoroethylene coated gasket for use in high cleanliness environments such as food and pharmaceutical

Abstract

The application belongs to the technical field of sealing gaskets, and discloses a polytetrafluoroethylene coated gasket applied to food, medicine and other high-cleanliness environments, which comprises a rubber closed ring and a polytetrafluoroethylene protective layer, the top of the rubber closed ring is provided with a rubber protective layer, the left side of the rubber protective layer is fixedly connected with a rubber air bag in communication, the inner cavity of the polytetrafluoroethylene protective layer is provided with a silica gel protective layer, the upper end of the inner side of the silica gel protective layer is provided with an upper pressure plate, and the bottom of the upper pressure plate is fixedly connected with a conductive plate. The application achieves the purpose of good connection of the inner and outer rings of the gasket through the cooperation of the limiting cylinder, the right sliding block and the left sliding block and other structures. When the rubber closed ring and the polytetrafluoroethylene protective layer are connected, the limiting pin enters the circular groove at the top of the limiting cylinder, the internal adhesive is extruded, the right sliding block and the left sliding block are driven to move out to the two sides, and the clamping connection with the rubber closed ring is formed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sealing gaskets, and specifically relates to a polytetrafluoroethylene coated gasket applied to food, medicine and other high-cleanliness environments. BACKGROUND

[0002] The polytetrafluoroethylene coated gasket is a gasket applied to various strong acids, strong alkalis, strong oxidants, chlorine and sealing of media not allowed to be polluted, is a combined gasket in which a soft gasket such as an asbestos rubber, an asbestos-free plate, a rubber or a graphite reinforced plate is used as a sandwich, and then a polytetrafluoroethylene sheet is coated outside, and has excellent corrosion resistance and good compression resilience.

[0003] The polytetrafluoroethylene coated gasket on the market has a relatively simple structure, the inner ring and the outer ring are adhered together by adhesive, the inner ring and the outer ring are prone to falling off in use, the combination effect is poor, and finally the sealing effect of the gasket is unsatisfactory, and the structure is set for the above problems, which can achieve the advantages of good connection effect, and ensures the sealing effect of the gasket as a whole.

[0004] In the use of the polytetrafluoroethylene coated gasket, the material has toughness, and is extruded by upper and lower flanges, and is prone to deformation, and the deformation means that the sealing effect is weakened, and therefore a gasket not prone to deformation is designed for the above problems, and the leakage problem caused by deformation of the gasket in use is solved.

[0005] Since the polytetrafluoroethylene coated gasket is located between two flanges, there is a gap between the inner ring of the gasket and the flanges, although the gap does not cause leakage, the substances inside the pipeline will erode the flanges, and the upper and lower ends of the inner ring are prone to gaps, which affects the sealing effect, and therefore a gasket with good sealing effect is designed for the above problems. SUMMARY

[0006] The application aims at the above problems, and provides a polytetrafluoroethylene coated gasket applied to food, medicine and other high-cleanliness environments, which has the advantages of good connection effect of the inner and outer rings of the gasket, not prone to deformation and good sealing effect in use.

[0007] In order to achieve the above object, the application provides the following technical scheme: A polytetrafluoroethylene coated gasket applied to food, medicine and other high cleanliness environments, comprising a rubber closed ring and a polytetrafluoroethylene protective layer, the top of the rubber closed ring is provided with a rubber protective layer, the left side of the rubber protective layer is fixedly connected with a rubber air bag, the inner cavity of the polytetrafluoroethylene protective layer is provided with a silica gel protective layer, the upper end of the inner side of the silica gel protective layer is provided with an upper pressure plate, the bottom of the upper pressure plate is fixedly connected with a conductive plate, the bottom of the conductive plate is fixedly connected with a lower pressure plate, the top of the polytetrafluoroethylene protective layer is fixedly installed with a limiting cylinder, the left and right sides of the upper end of the limiting cylinder are respectively provided with a left sliding block and a right sliding block, and the top of the inner cavity of the rubber closed ring is fixedly installed with a limiting pin.

[0008] As a preferred technical scheme of the application, the limiting cylinder is cylindrical, a circular groove is formed in the middle of the top of the limiting cylinder, the height value of the circular groove is greater than the height value of the limiting pin, the upper end of the limiting cylinder is provided with a first movable groove penetrating through left and right sides, the left and right ends of the bottom of the circular groove are respectively connected with the first movable grooves where the left sliding block and the right sliding block are located, and the circular groove inside the top of the limiting cylinder is filled with adhesive. The height value of the circular groove is greater than the height value of the limiting pin, that is, the limiting pin cannot contact the bottom of the circular groove when it is in a clamping relationship with the limiting cylinder, but there is a certain space left. The bottom of the circular groove is connected with the first movable groove, which can ensure that the adhesive inside moves in the space to achieve better connection. The adhesive inside the circular groove of the top of the limiting cylinder can extrude the adhesive when the limiting pin enters the circular groove, which can better extrude the right sliding block and the left sliding block. After the adhesive solidifies, it can fix the connected structure and itself can form a certain supporting effect, which can ensure that the fixing is more firm.

[0009] As a preferred technical scheme of the application, a cylindrical groove is formed in the top of the inner cavity of the rubber closed ring, a limiting pin is fixedly installed in the middle of the top of the cylindrical groove, second movable grooves are formed on both sides of the upper end of the cylindrical groove, which can be used for the movement of the right sliding block and the left sliding block. When the rubber closed ring and the polytetrafluoroethylene protective layer are not installed, the right sliding block and the left sliding block are located in the inner wall of the rubber closed ring. After installation, the limiting pin enters the circular groove in the top of the limiting cylinder, extrudes the internal adhesive and moves the right sliding block and the left sliding block outward to form a sleeve joint with the rubber closed ring, which can achieve better fixing effect.

[0010] As a preferred technical scheme of the present application, the number of the rubber protective layers is eight and they are annularly and equiangularly distributed on the top of the rubber closed ring, the cross-sectional shape of the rubber protective layer is inverted L-shaped, the top view of the rubber protective layer is fan-shaped, the inside of the rubber protective layer is provided with a first cavity, the cross section of the rubber air bag is circular ring-shaped and the rubber air bag is easily deformed when it is pressed, when the gasket is pressed between the flanges, the material of the rubber closed ring can slightly deform, the air inside the rubber protective layer is pressed into the inside of the rubber air bag, the rubber air bag expands to fill the gap between the flanges and the gasket, and the sealing effect can be enhanced.

[0011] As a preferred technical scheme of the present application, the conducting plate, the upper pressure plate and the lower pressure plate are all made of hard plastic blocks, the shapes of the upper pressure plate and the lower pressure plate are both fan-shaped, the left and right ends of the top of the conducting plate are connected with the upper pressure plate through adhesive, and the bottom of the conducting plate is fixedly connected with the lower pressure plate through adhesive, the upper pressure plate and the lower pressure plate are located inside the silica gel protective layer and can disperse pressure when the silica gel protective layer is pressed, the conducting plate can conduct the pressure, and the upper pressure plate, the conducting plate and the lower pressure plate can support and fix the polytetrafluoroethylene protective layer, so that the polytetrafluoroethylene protective layer will not deform too much when it is pressed.

[0012] As a preferred technical scheme of the present application, the number of the limiting cylinders is not unique and the upper and lower ends of the polytetrafluoroethylene protective layer are both provided with limiting cylinders, the limiting cylinders are made of hard plastic blocks and have a certain hardness, so that they can support the polytetrafluoroethylene protective layer, and the upper and lower ends of the polytetrafluoroethylene protective layer are both provided with multiple limiting cylinders, so that the fixing and supporting effects are better.

[0013] As a preferred technical scheme of the present application, the inner and outer surfaces of the silica gel protective layer are both provided with anti-skid lines, the surface of the inner cavity of the polytetrafluoroethylene protective layer is provided with anti-skid lines, and the contact surfaces of the conducting plate and the lower pressure plate are both provided with anti-skid lines, so that the activity between the structures can be effectively reduced, the stability of the structure is enhanced, and the sealing effect is improved.

[0014] As a preferred technical scheme of the present application, the right sliding block and the left sliding block are both cylindrical structures and the diameters of the right sliding block and the left sliding block are equal to the diameter of the circular groove on the top of the limiting cylinder, so that the diameters of the three are equal and a cross-shaped structure is formed, the forces of the parts are uniform, and the fixing effect is good after the adhesive solidifies.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The gasket inner and outer ring connecting effect is good, the rubber closed ring and the polytetrafluoroethylene protective layer are connected, the limiting pin enters the circular groove at the top of the limiting cylinder, the internal viscose is extruded, the right sliding block and the left sliding block are driven to move out to the two sides and are clamped with the rubber closed ring, the fixed connection effect of the rubber closed ring and the polytetrafluoroethylene protective layer can be effectively increased, the limiting cylinder made of hard plastic can play a certain supporting effect, and the viscose can also fix the structure after solidification.

[0017] 2. The gasket inner and outer ring connecting effect is good, the rubber closed ring and the polytetrafluoroethylene protective layer are connected, the limiting pin enters the circular groove at the top of the limiting cylinder, the internal viscose is extruded, the right sliding block and the left sliding block are driven to move out to the two sides and are clamped with the rubber closed ring, the fixed connection effect of the rubber closed ring and the polytetrafluoroethylene protective layer can be effectively increased, the limiting cylinder made of hard plastic can play a certain supporting effect, and the viscose can also fix the structure after solidification.

[0018] 3. The rubber protective layer and the rubber air bag are used, the rubber closed ring is deformed due to its own physical properties when pressure is applied, the top of the rubber protective layer is in contact with the flange plate and is closed, then the flange plate extrudes the rubber protective layer to make the internal air enter the rubber air bag, since the rubber air bag is easy to deform, expansion is generated to close the connection between the inner side of the gasket and the flange plate, the fixing effect of the gasket can be increased, and the erosion of the flange plate by the material in the pipe can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure of the application is shown in the figure;

[0020] Figure 2 The overall structure of the application is shown in the figure;

[0021] Figure 3 The structure of the application is shown in the figure; Figure 2 The structure of the application is shown in the figure;

[0022] Figure 4 The structure of the application is shown in the figure;

[0023] Figure 5 The structure of the application is shown in the figure;

[0024] Figure 6 The structure of the application is shown in the figure;

[0025] Figure 7 The structure of the application is shown in the figure; Figure 2 The structure of the application is shown in the figure;

[0026] In the diagram: 1. Rubber sealing ring; 2. Polytetrafluoroethylene protective layer; 3. Rubber protective layer; 4. Rubber airbag; 5. Silicone protective layer; 6. Upper pressure plate; 7. Conducting plate; 8. Lower pressure plate; 9. Limiting pin; 10. Limiting cylinder; 11. Right slider; 12. Left slider. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 7 As shown, the present invention provides a polytetrafluoroethylene (PTFE) coated gasket for use in high-cleanliness environments such as food and medicine, comprising a rubber sealing ring 1 and a PTFE protective layer 2. A rubber protective layer 3 is provided on the top of the rubber sealing ring 1. A rubber airbag 4 is fixedly connected to the left side of the rubber protective layer 3. A silicone protective layer 5 is provided in the inner cavity of the PTFE protective layer 2. An upper pressure plate 6 is provided at the upper end of the inner side of the silicone protective layer 5. A conduction plate 7 is fixedly connected to the bottom of the upper pressure plate 6. A lower pressure plate 8 is fixedly connected to the bottom of the conduction plate 7. A limiting cylinder 10 is fixedly installed on the top of the PTFE protective layer 2. A left slider 12 and a right slider 11 are respectively provided on the left and right sides of the upper end of the limiting cylinder 10. A limiting pin 9 is fixedly installed on the top of the outer inner cavity of the rubber sealing ring 1.

[0029] The limiting cylinder 10 is cylindrical, with a circular groove in the middle of its top. The height of the circular groove is greater than the height of the limiting pin 9. The upper end of the limiting cylinder 10 has a first movable groove that runs through it from left to right. The left and right ends of the bottom of the circular groove are connected to the first movable grooves where the left slider 12 and the right slider 11 are located, respectively. The circular groove at the top of the limiting cylinder 10 is filled with adhesive. The height of the circular groove is greater than the height of the limiting pin 9, meaning that when the limiting pin 9 is engaged with the limiting cylinder 10, it cannot contact the bottom of the circular groove, leaving a certain amount of space. Furthermore, the bottom of the circular groove is connected to the first movable groove, ensuring that the adhesive inside can move within the space, achieving a better connection effect. The adhesive filling the circular groove at the top of the limiting cylinder 10 allows the limiting pin 9 to squeeze the adhesive when it enters the circular groove, which can better extrude the right slider 11 and the left slider 12. After the adhesive solidifies, it can fix the connected structure and provide a certain support effect, ensuring a more secure fixation.

[0030] The top of the inner cavity of the rubber closed ring 1 is provided with a cylindrical groove, a limiting pin 9 is fixedly installed in the middle of the top of the cylindrical groove, second movable grooves are arranged on both sides of the upper end of the cylindrical groove, the right sliding block 11 and the left sliding block 12 are located in the inner wall of the rubber closed ring 1 when the rubber closed ring 1 is not installed with the polytetrafluoroethylene protective layer 2, and the limiting pin 9 enters the circular groove in the top of the limiting cylinder 10 after installation, extruding the internal adhesive to make the right sliding block 11 and the left sliding block 12 move outward and form a sleeve joint with the rubber closed ring 1, so that a better fixing effect can be achieved.

[0031] The number of the rubber protective layer 3 is eight and is distributed in an annular equiangular manner on the top of the rubber closed ring 1, the cross-sectional shape of the rubber protective layer 3 is inverted L-shaped, the top view of the rubber protective layer 3 is fan-shaped, the inner part of the rubber protective layer 3 is provided with a first cavity, the cross section of the rubber air bag 4 is circular ring-shaped and the rubber air bag 4 is easy to deform when subjected to pressure, the material of the rubber closed ring 1 can be slightly deformed when the gasket is extruded between the flanges, the air in the rubber protective layer 3 is extruded into the inner part of the rubber air bag 4, the rubber air bag 4 is expanded to fill the gap between the flanges and the gasket, and the sealing effect can be enhanced.

[0032] The conducting plate 7, the upper pressure plate 6 and the lower pressure plate 8 are all made of hard plastic blocks, the shapes of the upper pressure plate 6 and the lower pressure plate 8 are both fan-shaped, the left and right ends of the top of the conducting plate 7 are connected with the upper pressure plate 6 through adhesive, the bottom of the conducting plate 7 is fixedly connected with the lower pressure plate 8 through adhesive, the upper pressure plate 6 and the lower pressure plate 8 are located in the silica gel protective layer 5 and can disperse pressure when subjected to pressure, the conducting plate 7 can conduct the pressure received, and the upper pressure plate 6, the conducting plate 7 and the lower pressure plate 8 can support and fix the polytetrafluoroethylene protective layer 2, so that the polytetrafluoroethylene protective layer 2 will not be deformed too much when subjected to extrusion.

[0033] The number of the limiting cylinder 10 is not unique and the upper and lower ends of the polytetrafluoroethylene protective layer 2 are both provided with limiting cylinders 10, the limiting cylinder 10 is made of hard plastic block and has a certain hardness, which can play a certain supporting role, and the upper and lower ends of the polytetrafluoroethylene protective layer 2 are both provided with a plurality of limiting cylinders 10, which can ensure better fixing and supporting effect.

[0034] The inner and outer surfaces of the silica gel protective layer 5 are both provided with anti-skid lines, the surface of the inner cavity of the polytetrafluoroethylene protective layer 2 is provided with anti-skid lines, and the contact surfaces of the conducting plate 7 and the lower pressure plate 8 are both provided with anti-skid lines, through the design of the anti-skid lines, the mobility between the structures can be effectively reduced, the stability of the structure is enhanced, and the sealing effect is improved.

[0035] Among them, the right slider 11 and the left slider 12 are cylindrical structures, and the diameter values of the right slider 11 and the left slider 12 are equal to the diameter value of the circular groove at the top of the limiting cylinder 10, the diameter values of the three are equal, forming a cross-shaped structure, and each part is uniformly stressed, and can achieve good fixing effect after the viscose solidification.

[0036] The working principle and use process of the present application are as follows:

[0037] First, fill the viscose in the circular groove at the top of the limiting cylinder 10 and the inner cavity surface of the outer ring of the rubber sealing ring 1, then wrap the outer side of the rubber sealing ring 1 with the inner end of the polytetrafluoroethylene protective layer 2, so that the limiting pin 9 can correspond to the circular groove at the top of the limiting cylinder 10, then press by machine, so that the limiting pin 9 extrudes the internal viscose and pushes the right slider 11 and the left slider 12 to move outwardly and form a clamping with the rubber sealing ring 1, then wait for the viscose to solidify;

[0038] When in use, the gasket is located between the two flanges and is extruded by the flanges, the upper pressure plate 6, the conducting plate 7 and the lower pressure plate 8 can disperse the pressure and form a supporting effect, and the internal air of the rubber protective layer 3 will enter the rubber air bag 4 after being extruded to make the rubber air bag 4 expand, which can fill the gap between the inner side of the gasket and the flange, increase the sealing effect, and prevent the flange from being eroded.

[0039] It should be noted that, in the present text, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0040] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A polytetrafluoroethylene (PTFE) coated gasket for use in high-cleanliness environments such as food and pharmaceutical industries, comprising a rubber sealing ring (1) and a PTFE protective layer (2), characterized in that: The top of the rubber closed ring (1) is provided with a rubber protective layer (3), and a rubber airbag (4) is fixedly connected to the left side of the rubber protective layer (3). The inner cavity of the polytetrafluoroethylene protective layer (2) is provided with a silicone protective layer (5). An upper pressure plate (6) is provided at the upper end of the inner side of the silicone protective layer (5). A conduction plate (7) is fixedly connected to the bottom of the upper pressure plate (6). A lower pressure plate (8) is fixedly connected to the bottom of the conduction plate (7). A limiting cylinder (10) is fixedly installed on the top of the polytetrafluoroethylene protective layer (2). A left slider (12) and a right slider (11) are respectively provided on the left and right sides of the upper end of the limiting cylinder (10). A limiting pin (9) is fixedly installed on the top of the outer inner cavity of the rubber closed ring (1). The limiting cylinder (10) is cylindrical. A circular groove is provided in the middle of the top of the limiting cylinder (10). The height of the circular groove is greater than the height of the limiting pin (9). A first movable groove that runs through the left and right sides is provided at the upper end of the limiting cylinder (10). The left and right ends of the bottom of the circular groove are respectively connected to the first movable groove where the left slider (12) and the right slider (11) are located. The circular groove at the top of the limiting cylinder (10) is filled with adhesive. A cylindrical groove is provided at the top of the outer inner cavity of the rubber closed ring (1), and a limit pin (9) is fixedly installed in the middle of the top of the cylindrical groove. A second movable groove is provided on both sides of the upper end of the cylindrical groove, which allows the right slider (11) and the left slider (12) to move.

2. The polytetrafluoroethylene-coated gasket according to claim 1, applicable to high-cleanliness environments such as food and pharmaceutical industries, is characterized in that: The number of rubber protective layers (3) is eight and they are distributed at equal angles on the top of the rubber closed ring (1). The cross-sectional shape of the rubber protective layer (3) is an inverted L shape. The top view of the rubber protective layer (3) is fan-shaped. The rubber protective layer (3) has a first cavity inside. The cross-section of the rubber airbag (4) is circular and the rubber airbag (4) is easily deformed when subjected to pressure.

3. The polytetrafluoroethylene-coated gasket according to claim 1, applicable to high-cleanliness environments such as food and pharmaceutical industries, is characterized in that: The conductive plate (7), the upper pressure plate (6) and the lower pressure plate (8) are all made of hard plastic blocks. The upper pressure plate (6) and the lower pressure plate (8) are both fan-shaped. The top left and right ends of the conductive plate (7) are connected to the upper pressure plate (6) by adhesive. The bottom of the conductive plate (7) is fixedly connected to the lower pressure plate (8) by adhesive.

4. A polytetrafluoroethylene-coated gasket for use in high-cleanliness environments such as food and pharmaceutical industries, as described in claim 1, characterized in that: The number of the limiting cylinders (10) is not unique and the upper and lower ends of the polytetrafluoroethylene protective layer (2) are provided with limiting cylinders (10), which are made of hard plastic blocks.

5. A polytetrafluoroethylene-coated gasket for use in high-cleanliness environments such as food and pharmaceutical industries, as described in claim 1, characterized in that: The inner and outer surfaces of the silicone protective layer (5) are provided with anti-slip textures, the inner surface of the polytetrafluoroethylene protective layer (2) is provided with anti-slip textures, and the contact surfaces of the conductive plate (7) and the lower pressure plate (8) are provided with anti-slip textures.

6. A polytetrafluoroethylene-coated gasket for use in high-cleanliness environments such as food and pharmaceutical industries, as described in claim 1, characterized in that: Both the right slider (11) and the left slider (12) are cylindrical structures, and the diameters of the right slider (11) and the left slider (12) are equal to the diameter of the circular groove at the top of the limiting cylinder (10).

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