KR102119263B1 - Pressure Bellows and its Manufacturing method - Google Patents

Abstract

The present invention provides pressure resistant bellows which are bellows comprising a wrinkle unit (110) and a supporter (140) for strengthening pressure resistance. The wrinkle unit (110) includes a large number of disk-shaped membranes (160) having a punching unit (160b) formed in the center thereof and a spherical wave-shaped curve formed around the punching unit (160b). The disk-shaped membranes (160) have a structure with continuous wrinkles which are formed by valleys (120a, 120b) and mountains (130) since inner edge units (160c) forming the punching units (160b) are coupled to and fixed on other disk-shaped membranes (160) adjacent to an upper surface, and the other disk-shaped membranes (160) adjacent to a lower surface are coupled to and fixed on an outer edge unit (160d). The supporter (140) for strengthening pressure resistance has a ring shape and is inserted into an inner valley (120a) or an outer valley (120b) of the wrinkle unit (110). According to the present invention, it is possible to improve reliability and durability of bellows.

Description

Pressure bellows and its manufacturing method

The present invention relates to a pressure-resistant bellows and a method for manufacturing the same.

Bellows are widely used in fields requiring stroke and volume change in an environment where vacuum and pressure differences occur, and are equipment that functions as vibration absorber and volume compensation while maintaining sealing. It is widely used in various fields such as aerospace and nuclear power.

Particularly, for a specific space in a chamber having a pressure space different from that of the outside air, such as atmospheric air and a vacuum space, a vacuum technology that blocks the movement of gas molecules due to a pressure difference and facilitates the operation of mechanical parts. Not only is it widely used in, it is also widely used in mechanical seal, which is an essential part of a rotating machine that includes a rotating shaft and requires fluid sealing.

As a specific example, the bellows is a mechanical seal component and is used in pumps, compressors and turbines. The above-listed equipment is a device for transporting, compressing, and expanding fluid, and if the mechanical seal does not perform the sealing function properly, its economic loss, such as deterioration of equipment performance and environmental pollution due to external leakage of the working fluid, is great. Therefore, the mechanical seal must guarantee the sealing performance during the design life and is a mechanical element requiring high reliability. Therefore, bellows is used as one of the key parts.

According to the above use, the bellows must be manufactured so that physical properties such as durability and airtightness are satisfied, and when used in an environment where a large pressure difference is generated, particularly strong pressure resistance is required.

However, as shown in FIG. 1, when a bellows that does not have excellent pressure resistance characteristics, such as a bellows in which a corrugated portion is formed by welding a thin plate, is used in an environment in which a large pressure difference is generated, shown in FIGS. 4 and 5 As described above, a problem arises in that the thin plate is deformed due to a pressure difference, and a weld is broken.

In particular, excessive deformation of the bellows due to the pressure difference when used as a part of the mechanical seal causes a MED (Mean Effective Diameter) shift phenomenon. This means that the balance ratio, which is the main design element of the mechanical seal, changes with pressure, and is a key cause that bellows cannot be applied to mechanical seals used in high pressure environments.

Therefore, for the above reasons, the bellows is used only under the pressure condition of 20 Bar or less, and the spring as shown in FIG. 11(a) is used under the pressure condition of the pressure.

However, in the case of using a spring, as shown in Fig. 11(a), as the face wears, a dynamic gasket moves toward the face (a-1). In addition, according to this, a solid leak occurs in the shaft in front of the dynamic gasket, and the solid acts as a cause of stagnation of the movement of the dynamic gasket (a-2), and the hung-up of the dynamic gasket (hang) -up) decreases the closing force, causing a problem of accelerating the leakage (a-3).

As shown in Fig. 11(b), when using a bellows, there is no dynamic gasket, so the movement of the gasket does not occur due to face wear (b-1), but solids accumulate on the shaft due to normal leakage. Since a hang-up does not occur (b-2), the problem of using a spring as described above can be solved.

However, as described above, since the bellows developed by the prior art cannot be used at a pressure exceeding 20 Bar, the development of a bellows that can be used at high pressure is urgently required.

Republic of Korea Patent Publication No. 10-2017-0095267

The present invention has been devised to solve the above problems of the prior art,

Even when used in a high pressure environment where a large pressure difference occurs, it has sufficient pressure resistance characteristics, and provides a bellows that is capable of simultaneously satisfying elastic and pressure resistance characteristics by providing a pressure-resistant support while providing smooth axial compression and tensile motion. It is aimed at.

In addition, an object of the present invention is to provide a creative manufacturing method that enables the production of the bellows.

The present invention to achieve the above object,

As a bellows including the corrugated portion 110 and the pressure-resistant reinforcement support 140,

The corrugated portion 110 includes a plurality of disc-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave shape curved around the perforated portion 160b, and the disc-shaped membrane ( The 160) are fixed to each other by combining the other membrane-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and the other disc-shaped membrane 160 adjacent to the lower surface and the outer edge portions 160d. ) Has a structure that is fixed to each other to form a continuous pleats made of the bone (120a, 120b) and the acid 130;

The pressure-resistant reinforcement support 140 has a ring shape, and provides a bellows characterized in that it is inserted into the inner bone 120a or the outer bone 120b of the wrinkle portion 110.

In addition, the present invention

(a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a curved wave having a spherical wave shape formed around the perforated portion 160b;

(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;

(c) narrowing the width of the valleys 120a and 120b and the mountain 130 by applying a longitudinal pressure to the corrugation portion 110;

(d) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a of the wrinkle portion 110;

(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And

(f) after the curing of step (e) is completed, it relates to a method of manufacturing a bellows comprising releasing the pressure applied to the corrugated portion 110.

In addition, the present invention

(a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a curved wave having a spherical wave shape formed around the perforated portion 160b;

(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;

(c) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a or the outer bone 120b of the wrinkle portion 110;

(D) step of narrowing the width of the bone (120a, 120b) and the acid 130 by applying a longitudinal pressure to the corrugation portion 110, the pressure-resistant reinforcement support 140 composition is introduced;

(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And

(f) after the curing of step (e) is completed, releasing the pressure applied to the corrugated portion 110; provides a method for manufacturing a bellows comprising a.

Since the bellows of the present invention has sufficient pressure resistance even when used in a high pressure environment where a large pressure difference occurs, it provides an effect of significantly improving the reliability and durability of the bellows.

In addition, the bellows of the present invention, while forming a continuous space of a predetermined size with adjacent disk-shaped membranes forming the inner bone or the outer bone for the pressure-resistant reinforcement support, while providing the pressure-resistant reinforcement support in the axial direction The compression and tensile motion is smooth, providing the effect of simultaneously satisfying the elastic and pressure resistance characteristics.

In addition, the method of manufacturing the bellows of the present invention provides a creative and efficient manufacturing method that enables the production of the bellows.

1 is a photograph taken in the form of a general bellows,
Figure 2 is a cross-sectional perspective view showing the shape of a conventional bellows,
3 is a view showing an example of a mechanical seal (Mechanical seal) by a conventional bellows,
4 and 5 is a view showing an example of use in a state in which the pressure difference between the inside and outside of the bellows is large as an example of a mechanical seal by a conventional bellows.
Figure 6 is a cross-sectional view showing one embodiment of the bellows of the present invention the pressure-resistant reinforcement support is inserted into the inner bone,
Figure 7 is a cross-sectional view and a plan view showing the shape and bonding form of the thin metal plate constituting the corrugated portion of the bellows of the present invention,
8 is a cross-sectional view showing in detail the structure of the bone portion formed by the bent portion of the spherical wave shape of the present invention and the support for strengthening the pressure inserted therein,
FIG. 9 is a perspective view showing the same shape as that of FIG. 6.
10 is a view showing an example of a mechanical seal (Mechanical seal) by the bellows of the present invention.
FIG. 11 is a view showing an example of a mechanical seal by a spring and a mechanical seal by a bellows.
12 is a view showing an example of a device for measuring the MED and MED Shift (change amount) of the bellows.
13 is a graph showing MED and MED shift (change amount) of bellows measured in a test example of the present invention.
14 is a cross-sectional view showing one embodiment of the bellows of the present invention, the pressure-resistant reinforcement support is inserted into the outer bone.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to describing the present invention, if it is determined that detailed descriptions of related known functions and configurations may unnecessarily obscure the subject matter of the present invention, descriptions thereof will be omitted.

The following description and drawings illustrate certain embodiments so that those skilled in the art can easily implement the described apparatus and methods. Other embodiments may include other structural and logical modifications. Individual components and functions can generally be selected unless explicitly required, and the order of the processes can be varied. Portions and features of some embodiments may be included in or substituted for other embodiments.

1 is a photograph taken in the form of a general bellows. As shown in FIG. 1, the bellows compensates for axial and radial movement of the equipment and performs a sealing function.

2 is a cross-sectional perspective view showing the shape of a conventional bellows, and as shown in FIG. 2, the bellows has a corrugated portion 11 including a valley 12 and a mountain 13 and an upper and lower flange 15 ).

3 shows an example of a mechanical seal by a conventional bellows, and FIGS. 4 and 5 are examples of a mechanical seal by a conventional bellows, where a pressure difference between the inside and outside of the bellows is large An example of use in is shown.

When a mechanical seal using a conventional bellows is used in an environment in which the pressure difference between the inside and the outside of the bellows is very large, deformation of the thin plate occurs as shown in FIG. 4, and the pressure difference is shown in FIG. 5. There is a problem in that the weld cannot be overcome and the weld is destroyed. When this problem occurs, it is necessary to stop using the device and replace the bellows, causing a very large productivity loss.

The present inventors made great efforts to solve the above problems, and as a result, the bellows of the developed form as shown in FIGS. 6 to 9 was completed.

6 is a cross-sectional view showing an embodiment of the bellows of the present invention; 7 is a cross-sectional view and a plan view showing a shape and a combination of the metal thin plate 160 constituting the corrugated portion 110 of the bellows of the present invention; 8 is a cross-sectional view showing in detail the structure of the bone portion formed by the bent portion of the spherical wave shape of the present invention and the support body 140 for strengthening the pressure inserted therein; FIG. 9 is a perspective view showing the same shape as that of FIG. 6.

As shown in Figures 6 and 7, the present invention is a bellows 100 including a corrugated portion 110 and a pressure-resistant reinforcement support 140,

The corrugated portion 110 includes a plurality of disc-shaped membranes 160 in which a perforated portion 160b is formed at the center and a curved wave shape 160a is formed around the perforated portion 160b. The plate-shaped membranes 160 are fixedly coupled to another disc-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b, and to the outer edge of the other disc-shaped membrane 160 adjacent to the lower surface. The parts 160d are fixed to each other and have a structure in which continuous pleats formed of the valleys 120a and 120b and the mountain 130 are formed;

The pressure-resistant reinforcement support 140 has a ring shape, and relates to a bellows 100 characterized in that it is inserted into the inner bone 120a or the outer bone 120b of the wrinkle portion 110.

Since the bellows of the present invention includes a pressure-resistant reinforcement support 140, destruction of the bellows does not occur even when used in a space in which a very high pressure difference exists, due to the shape of the corrugated portion 110 having a special structure. Even when the pressure-resistant reinforcement support 140 is inserted, it has a feature that axial compression and tensile motion are smooth.

In one embodiment of the present invention, the bellows, as shown in FIG. 8, the width of the inner side of the corrugated portion 110 (120a) or the outer side of the bone (120b) from the clogged side toward the entrance (x ) Has a structure that gradually increases, and the support body 140 for pressure-resistant reinforcement inserted therein also has a thickness (y) that gradually increases according to the shape of the bone,

The width (x) of the bone and the thickness (y) of the pressure-resistant reinforcement 140 in a section of 50% or more of the entire section provided with the pressure-resistant reinforcement 140 are 1:0.3 to 0.9 based on the same point. It can have features that meet the ratio.

When the width (x) of the inner bone 120a or the outer bone 120b of the corrugated portion 110 and the thickness y of the support body 140 for internal pressure reinforcement inserted therein satisfy the above conditions, While providing the pressure-resistant support 140, the axial compression and tensile motion are smooth to simultaneously satisfy the elastic and pressure resistance characteristics, and thus can be usefully used in various industries.

That is, as shown in Figure 8, the pressure-resistant reinforcement support 140 is a disk-like membrane forming the inner bone (120a) or the outer bone (120b) and the continuous space of a constant size ( By forming 170), axial compression and tensile motion are smooth, so that it is possible to simultaneously satisfy elastic properties and pressure resistance properties.

The width (x) of the bone and the thickness (y) of the pressure-resistant reinforcement support 140 are 1: 0.3 to 0.9 based on the same point in more than 50% of the entire sections provided with the pressure-resistant reinforcement support 140. It is desirable to meet the ratio, when the ratio of the thickness (y) of the pressure-resistant reinforcement support 140 is less than 0.3, the letter “V” shaped by the disk-shaped membrane 160 is shaped like a letter by the high pressure. It is deformed into a “U”-like shape, and it is difficult to suppress destruction in the end. If it exceeds 0.9, there is insufficient space between the disk-shaped membrane 160 and the pressure-resistant reinforcement support 140 to prevent axial compression. It is not preferable because it is difficult to secure an elastic force.

In addition, when the above conditions are satisfied only in less than 50% of the entire section provided with the pressure-resistant support 140, it is difficult to expect the above effects, which is not preferable.

With respect to the continuous spaces 170 of constant size formed by the disk-like membranes 160 forming the pressure-resistant reinforcement support 140 and the inner bone 120a or the outer bone 120b, the internal pressure Better effect when the ratio of the width of the bone and the thickness of the pressure-resistant reinforcement 140 in the section of 80% or more of the entire section provided with the reinforcement support 140 satisfy the ratio of 1:0.5 to 0.9 based on the same point Can be expected.

Furthermore, the ratio of the width of the bone and the thickness of the support body for pressure-reinforcement 140 in the interval of 80% or more of the entire section provided with the support for pressure-reinforcement 140 satisfies the ratio of 1: 0.7 to 0.8. If you do, you can expect a better effect.

In one embodiment of the present invention, the pressure-resistant reinforcement support 140 includes an inner edge portion 160c and an inner edge portion 160c of the disc-shaped membrane 160 at the inlet side of the inner bone 120a of the corrugated portion 110. ) From the end of the fixed part or from the contact point between the inner edges 160c to the blocked part, or

The outer bone 120b is integrally inserted from the end of the fixed portion of the outer edge portion 160d and the outer edge portion 160d of the disc-shaped membrane 160 at the entrance side or from the contact point between the outer edge portions 160d to the blocked portion. Can be.

The pressure-resistant support 140 having the above-described structure uniformly supports the entire surface of the disk-shaped membrane 160 when a strong axial compressive force is applied, and thus, the form of the disk-shaped membrane 160 by strong axial pressure It can effectively prevent the deformation or destruction.

In one embodiment of the present invention, the upper surface and the lower surface of the pressure-resistant reinforcement support 140 are spaced apart from adjacent disk-shaped membrane 160 surfaces, and the separation is at least 50% in the longitudinal center axis direction of the bellows. More preferably 80% or more, even more preferably 90% or more, and most preferably 95% or more. When the spaced space 170 is provided as described above, when the strong axial compression force acts, the shape of the disk-shaped membrane 160 can be effectively prevented from being deformed or destroyed, and it is also preferable to secure elasticity of compression and elongation of the bellows. Do.

In one embodiment of the present invention, the bending of the spherical wave shape of the disk-shaped membrane 160 may include a pair of 1 to 5 bones 160e and acids 160f. However, it is not limited to this range, and may include a pair of 5 or more bones and acids.

Spherical wave-shaped bends are formed as described above, so that the pressure-resistant reinforcement support 140 is suppressed from falling, and compression and extensibility are excellent, and the bellows spring constant is reduced. In addition, during the manufacturing of the bellows, in the process of manufacturing the metal thin plate (membrane 160), distortion or waviness in the circumferential direction occurs. Triggering, adversely affecting the bellows performance. By applying a spherical wave-shaped curve to the disk-shaped membrane 160, it is possible to obtain an effect that the deformation in the circumferential direction of the membrane 160 is alleviated.

In one embodiment of the present invention, the pressure-resistant reinforcement support 140 is preferably provided on the entire inner bone 120a or the outer bone 120b of the corrugated portion 110. If, if any of the inner bone (120a) or the outer bone (120b) does not contain a pressure-increasing support 140, a portion of the pressure is concentrated in that part, the shape of the bellows is deformed or destroyed It is not preferable because it may occur.

In one embodiment of the present invention, the disk-shaped membrane 160 may be a metal thin plate having a thickness of 0.01 to 2 mm, but is not limited thereto. The metal thin plate can be used without limitation that is known in the art.

In one embodiment of the present invention, the bonding and fixing of the inner edge portion 160c and the outer edge portion 160d of the disc-shaped membrane 160 may be carried out in a manner used in this field, and typically fixed by a welding method. have.

10 shows an example of a mechanical seal according to the present invention. As illustrated in FIG. 10, in the bellows of the present invention, when the pressure difference between the inside and the outside of the bellows is large, the support body 140 for strengthening the pressure is provided in the bone 120a in a space with a low pressure. 10 shows a case where the pressure inside the bellows 100 is small. In this case, unlike the conventional bellows shown in FIG. 5, the support for strengthening the internal pressure is that the bone located on the larger pressure side is transformed from the letter “V”-like form to the letter “U”-like form by external pressure ( 140), excessive deformation of the thin plate and rupture of the fixing portion are effectively prevented.

The bellows 100 of the present invention may have a pressure-resistant characteristic for a pressure of more than 20 Bar, specifically, a pressure-resistant characteristic for a pressure of more than 20 Bar to 1,000 Bar, preferably 30 to 1,000 Bar, More preferably, it may have a pressure-resistant characteristic for a pressure of 50 to 1,000 Bar. The upper limit of the pressure in the above may be limited to 1,00 Bar, 300 Bar, 500 Bar.

In addition, it is natural that the bellows of the present invention can be used without difficulty even in a space in which a pressure difference does not exist or in a space in which a pressure difference exists below 100 Bar.

The pressure-resistant reinforcement support 140 may have a characteristic formed of an elastic body, and the elongation of the elastic body may have a characteristic of 30 to 1,000%. Specifically, when the hardness is 3 to 95 Shore A, it may have a characteristic of 30 to 510%, and when the hardness is 45 to 85 ShoreD, it may have a characteristic of 100 to 450%.

When the hardness of the pressure-resistant support 140 is too high, damage to the thin plate of the bellows 100 may be caused, and if the hardness is too low, the pressure-resistant characteristic is deteriorated. Therefore, those having suitable hardness and elasticity can be preferably used.

The pressure-resistant reinforcement support 140 may be made of, for example, FKM, FFKM, EPDM, NBR, Silicone rubber, PTFE, or the like.

In the bellows 100 of the present invention, the shape of the flange 150 coupled to both ends of the corrugated portion 110 is not particularly limited, and a flange of a suitable shape according to the use and use form of the bellows 100 150 may be mounted.

In the bellows 100 of the present invention, for a configuration not particularly limited above, the configuration of a conventional bellows in this field can be employed without limitation.

In addition, the present invention

(a) a step of manufacturing a plurality of disc-shaped membranes 160 in which a perforated portion 160b is formed at the center and a curved wave shape 160a is formed around the perforated portion 160b;

(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;

(c) narrowing the width of the valleys 120a and 120b and the mountain 130 by applying a longitudinal pressure to the corrugation portion 110;

(d) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a of the wrinkle portion 110;

(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And

(f) after the curing of step (e) is completed, it relates to a method of manufacturing a bellows comprising releasing the pressure applied to the corrugated portion 110.

In the step (d), while filling the composition for forming the pressure-resistant support 140, or after filling the composition for forming the pressure-resistant support 140, the bellows are rotated based on the central axis of the perforation unit 160b. Further processing may be performed. When the bellows are rotated in this way, it is preferable that the composition for forming the filled pressure-resistant support 140 can be obtained by uniformly filling the inside of the bone by centrifugal force.

In addition, after the composition for forming the pressure-resistant reinforcement support 140 is filled in the step (d), when the composition for forming the pressure-resistant reinforcement support 140 formation by this state is possible, release the longitudinal pressure, It is also possible to perform a curing process.

In addition, the present invention

(a) a step of manufacturing a plurality of disc-shaped membranes 160 in which a perforated portion 160b is formed at the center and a curved wave shape 160a is formed around the perforated portion 160b;

(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;

(c) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a or the outer bone 120b of the wrinkle portion 110;

(D) step of narrowing the width of the bone (120a, 120b) and the acid 130 by applying a longitudinal pressure to the corrugation portion 110, the pressure-resistant reinforcement support 140 composition is introduced;

(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And

(f) after the curing of step (e) is completed, releasing the pressure applied to the corrugated portion 110; relates to a method of manufacturing a bellows comprising a.

In step (c), while filling the composition for forming the pressure-resistant support 140, or after filling the composition for forming the pressure-resistant support 140, the bellows is rotated based on the central axis of the perforation unit 160b. Further processing may be performed. When the bellows are rotated in this way, it is preferable that the composition for forming the filled pressure-resistant support 140 can be obtained by uniformly filling the inside of the bone by centrifugal force.

In addition, when the molding of the composition for forming the pressure-resistant reinforcement support 140 is possible by the step (d), it is also possible to perform a curing process after releasing the longitudinal pressure.

The contents of the bellows described above may be applied to the method of manufacturing the bellows of the present invention. Therefore, the overlapping contents are omitted below.

In one embodiment of the present invention, the manufacturing method is before filling the composition for forming the pressure-resistant reinforcement support 140 in the inner bone 120a or the outer bone 120b of the wrinkle portion 110 in step (c). The step of applying a release agent to the inner bone 120a or the outer bone 120b of the wrinkle portion 110 may be further included. The release agent may be a component known in the art without limitation, for example, silicone resin, paraffin, wax, etc. may be used, but is not limited thereto.

In one embodiment of the present invention, the pressure-resistant strengthening support 140 composition may include a polymer resin, a curing agent, and a solvent. The pressure-resistant reinforcement support 140 composition may include 40 to 80% by weight of a polymer resin, 1 to 10% by weight of a curing agent, and 10 to 50% by weight of a solvent based on the total weight of the composition.

In particular, the pressure-resistant strengthening support 140 composition may be preferably used having a viscosity of 10 to 300 Pa.s, and more preferably 100 to 200 Pa.s. If the viscosity is less than 10 Pa.s, the flowability of the composition is too large to be injected into the inner bone 120a or the outer bone 120b, and when it exceeds 300 Pa.s, the composition is the inner bone 120a ) Or it is not preferable because it is difficult to put in the external bone (120b).

In one embodiment of the present invention, the polymer resin may be one or more selected from the group consisting of FKM (Fluoro Elastomer), silicone, and the like, but is not limited thereto.

The curing may be performed by thermal curing or photo curing, and a component known in the art may be used as a curing agent.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical scope of the present invention. It is natural that such changes and modifications fall within the scope of the appended claims.

Preparation Example 1: Preparation of pressure-resistant reinforcement support composition

Denkist's CharmFlex Series, ShinEtsu's RTV rubber (Silicon) composition were used as a pressure-resistant strengthening support composition.

Test example: MED (Mean Effective Diameter) Shift evaluation

The MED (Mean Effective Diameter) Shift of the bellows manufactured according to the present invention and the bellows manufactured according to Korean Patent No. 10-1933176 was evaluated by the following method.

(1) Test method

12 is a test equipment for measuring the MED of the bellows. The test equipment consists of a pressure vessel, a shaft assembly, a load cell, an upper support plate and a lower support plate. As shown in Fig. 12, the bellows is mounted on the shaft assembly. At this time, suitable packing is used for sealing between the bellows and the pressure vessel and between the bellows and the shaft assembly. Before the pressure is applied to the inside of the pressure vessel, the shaft assembly falls down due to its own weight. To prevent this, a nut is assembled in the middle portion of the shaft assembly to hang over the pressure vessel to support the load of the shaft assembly. Then, when pressure is applied to the inside of the pressure vessel, a force is generated in the upper direction of the shaft assembly for the area along the pressure boundary surface (MED) of the bellows, and this force is transmitted to the load cell and measured and recorded in real time. The working area of pressure is obtained through the relationship between pressure, working area, and force, and MED is calculated based on this. At this time, the load ( F _L ) value of the load cell should be added to the weight ( w ) of the shaft assembly and the spring force ( F _S ) generated from the bellows in the assembled state.

As described above, it is possible to calculate the MED of the bellows by measuring the pressure applied to the bellows and the load applied to the load cell at that time.

The product used for the test of this bellows is a bellows product designed with MED 75mm and the performance difference between the products was confirmed by using the product to which the technology of Patent No. 10-1933176 was applied as a control.

(2) Test results

As a result of performing the MED test, as shown in FIG. 13, the MED shift (change amount) of the product of the present invention began to occur at a pressure of 40 bar or more and appeared to be 0.7 mm at 100 bar, and the same pressure in the case of a product to which an existing patent was applied. Under the conditions, a MED shift of about 2 times compared to the product of the present invention occurred. Through this test, it was confirmed that the technology of the present invention significantly improved the MED shift suppression ability compared to the existing technology.

Although the present invention has been described in connection with the preferred embodiments mentioned above, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will include such modifications or variations as long as they fall within the spirit of the present invention.

10: conventional bellows 11: wrinkles
12: Goal 13: Mountain
15: flange 100: bellows of the present invention
110: wrinkles 120a: inner bone
120b: external goal 130: mountain
140: pressure-resistant support 150: flange
160: disc-shaped membrane 160a: spherical wave corrugated portion
160b: punched portion 160c: inner edge portion
160d: outer edge 160e: bone of disc-shaped membrane
160f: acid of disc-shaped membrane 170: separation space

Claims (18)

As a bellows including the corrugated portion 110 and the pressure-resistant reinforcement support 140,
The corrugated portion 110 includes a plurality of disc-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave shape curved around the perforated portion 160b, and the disc-shaped membrane ( 160) are fixed to the other inner disk 160 adjacent to the upper surface and the inner edge part 160c forming the perforated part 160b, and the other outer disk-shaped membrane 160 adjacent to the lower surface and the outer edge part 160d ) Has a structure that is fixed to each other to form a continuous pleats made of the bone (120a, 120b) and the acid 130;
The pressure-resistant reinforcement support 140 has a ring shape, and is inserted into the inner bone 120a or the outer bone 120b of the wrinkle portion 110,
The inner bone 120a or the outer bone 120b of the wrinkle portion 110 has a structure in which the width gradually increases from the clogged side to the entrance side,
The pressure-resistant support body 140 inserted therein also has a gradually increasing thickness according to the shape of the bone,
The width of the bones 120a, 120b and the thickness of the pressure-resistant strengthening support 140 in a section of 80% or more of the entire section provided with the pressure-proofing support 140 are in a ratio of 1:0.5 to 0.9 based on the same point. Meets,
The bellows characterized in that the separation space is formed between the membrane 160 and the pressure-resistant reinforcement support 140 according to the difference in the width of the bone (120a, 120b) and the pressure-resistant reinforcement support 140. delete delete According to claim 1,
The width of the bones 120a and 120b and the thickness of the pressure-resistant strengthening support 140 in a section of 80% or more of the entire section provided with the pressure-proofing support 140 are in a ratio of 1:0.7 to 0.8 based on the same point. Characterized in that the bellows. According to claim 1,
The pressure-resistant reinforcement support 140 is from the fixed end of the inner edge portion 160c and the inner edge portion 160c of the disc-shaped membrane 160 at the inlet side of the inner bone 120a of the corrugated portion 110, or From the contact point between the inner edges (160c) to the blocked part is integrally inserted,
Integrally inserted from the end of the fixed edge of the outer edge portion 160d and the outer edge portion 160d of the disc-shaped membrane 160 at the entrance side of the outer side bone 120b to the blocked portion from the contact point between the outer edge portions 160d. Bellows characterized by being. The method of claim 5,
The upper surface and the lower surface of the pressure-resistant reinforcement support 140 are spaced apart from the adjacent disk-shaped membrane 160 surface, and the separation is continuously formed in a section of 50% or more in the longitudinal center axis direction of the bellows. Bellows. The method of claim 6,
The upper surface and the lower surface of the pressure-resistant reinforcement support 140 are spaced apart from the adjacent disk-shaped membrane 160, and the separation is continuously formed in a section of 80% or more in the longitudinal center axis direction of the bellows. Bellows. According to claim 1,
The bend of the spherical wave shape of the disk-shaped membrane 160 is characterized in that it comprises a pair of 1 to 5 bones (160e) and acid (160f). According to claim 1,
The pressure-resistant reinforcement support 140 is a bellows, characterized in that provided on the entire inner bone (120a) or outer bone (120b) of the corrugated portion (110). The method of claim 9,
The bellows is a bellows characterized in that it has a pressure-resistant characteristic for the pressure of more than 20 Bar ~ 1,000 Bar. According to claim 1,
The pressure-resistant reinforcement support 140 is bellows, characterized in that formed of an elastic body. The method of claim 11,
The elongation of the elastic body is a bellows, characterized in that 30 to 1,000%. (a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a curved wave having a spherical wave shape formed around the perforated portion 160b;
(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;
(c) narrowing the width of the valleys 120a and 120b and the mountain 130 by applying a longitudinal pressure to the corrugation portion 110;
(d) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a of the wrinkle portion 110;
(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And
(f) after the curing of step (e) is completed, releasing the pressure applied to the corrugated portion 110; bellows manufacturing method comprising a. (a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a curved wave having a spherical wave shape formed around the perforated portion 160b;
(b) the disc-shaped membranes 160 are fixedly coupled to other disc-shaped membranes 160 adjacent to the upper surface and the inner edge portions 160c forming the perforations 160b, and other disc-shaped membranes adjacent to the lower surface. Step (160) and the outer edge portion (160d) by fixing the coupling, to produce a pleated portion (110) of continuous pleats formed of a certain width of the bone (120a, 120b) and the mountain 130;
(c) filling the composition for forming the support body 140 for internal pressure strengthening in the inner bone 120a or the outer bone 120b of the wrinkle portion 110;
(D) step of narrowing the width of the bone (120a, 120b) and the acid 130 by applying a longitudinal pressure to the corrugation portion 110, the pressure-resistant reinforcement support 140 composition is introduced;
(e) curing the composition for pressure-resistant reinforcement of step (d) 140; And
(f) after the curing of step (e) is completed, releasing the pressure applied to the corrugated portion 110; bellows manufacturing method comprising a. The method of claim 13 or 14,
Wrinkles before filling the composition for forming the pressure-resistant reinforcement support 140 in the inner bone 120a or the outer bone 120b of the wrinkle portion 110 in steps 13 (d) and 14 (c). Method of manufacturing a bellows further comprising the step of applying a release agent to the inner bone (120a) or the outer bone (120b) of (110). The method of claim 13 or 14,
The pressure-resistant reinforcement support 140 composition is a method of manufacturing a bellows, characterized in that it comprises a polymer resin, a curing agent, and a solvent. The method of claim 16,
The polymer resin is FKM (fluorine rubber), a method of manufacturing a bellows, characterized in that at least one member selected from the group consisting of silicone rubber. The method of claim 16,
The curing agent is a method of manufacturing a bellows, characterized in that the thermosetting agent or photocuring agent.

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