JP6377561B2 - Pressure vessel - Google Patents

Description

  The present invention relates to a pressure vessel whose interior is partitioned into two chambers by a central partition wall provided in the vertical direction.

  An intercooler and an aftercooler used in an oil-free compressor that performs compression in two stages are a kind of pressure vessel. In an oil-free compressor, air that has been compressed by a first-stage compressor and heated to high temperature (adiabatic compression) is cooled by an intercooler, returned to room temperature, compressed again by a two-stage compressor, and again by an aftercooler. Cool to room temperature and supply to users.

  However, if spaces for the intercooler and the aftercooler are respectively provided in the compressor unit, there is a problem that miniaturization of the oil-free compressor is hindered.

  In addition, the conventional intercooler and aftercooler have a rectangular parallelepiped shape, and the area of the upper surface and the lower surface is large. Therefore, the displacement (expansion amount) increases on the upper surface and the lower surface. Stress increases at the part (particularly the inner surface). Therefore, in order to reduce the stress, it has been necessary to increase the thickness of the container body, increase the thickness of the reinforcing rib, or increase the height of the reinforcing rib. For this reason, the weight is considerably increased, and the material cost is also increased.

  Therefore, although it is a cylinder-shaped pressure vessel, Patent Document 1 discloses a flat pressure vessel whose interior is partitioned into a plurality of cylindrical main storage areas by a longitudinal partition wall provided inside. Moreover, as shown in FIG. 6A which is a perspective view and FIG. 6B which is a cross-sectional view, the inside of a rectangular parallelepiped pressure vessel is divided into two chambers by a central partition, and one is an intercooler and the other is an aftercooler. An integrated intercooler and aftercooler have been devised.

  In the integrated structure shown in FIGS. 6A and 6B, a tensile force acts on the central partition wall when an internal pressure is applied, so that the amount of displacement (expansion amount) in the central portion of the upper and lower surfaces is greatly suppressed, and the stress is reduced. Can do. Thereby, the wall thickness of a container main body can be made thin, and it can be reduced in weight rather than the total weight in the case where an intercooler and an aftercooler are separate bodies.

  Further, in order to further reduce the weight while suppressing deformation due to internal pressure, as shown in FIG. 7 which is a perspective view, a gas in which a plurality of reinforcing ribs 41 continuous in the circumferential direction are provided at predetermined intervals on the outer periphery of the container body. A cooler (pressure vessel) 51 has also been devised. The thickness and height of the reinforcing rib 41 are uniform in the circumferential direction.

Japanese Patent Laying-Open No. 2005-155776

  However, in the configuration shown in FIG. 7, there are reinforcing ribs 41 that are effective against deformation due to internal pressure, and reinforcing ribs 41 that are not very effective. Further, even in one reinforcing rib 41, there are a portion where the effect is exhibited and a portion where the effect is not exhibited. That is, since the deformation is large at the center of each surface, the reinforcing rib 41 is effective. However, the deformation is small near the central partition on the upper and lower surfaces and in the vicinity of the peripheral edge of each surface. Does not work. In other words, in the case of the reinforcing rib 41 that is continuous in the circumferential direction, the stress is relatively high in the central portion of each surface, but the portion opposed to the central partition on the upper and lower surfaces and the peripheral portion of each surface. In the vicinity, the stress is not so high.

  An object of the present invention is to provide a pressure vessel that can be reduced in weight while effectively suppressing deformation due to internal pressure.

  The present invention is a rectangular parallelepiped-shaped pressure vessel having an interior divided into two chambers by a central partition wall provided in the vertical direction, and is provided on each of an upper surface and a lower surface, protrudes to the outside, and intersects the central partition wall A first rib extending in a direction to be extended, and a second rib provided on each of the right and left surfaces that are two side surfaces facing the central partition wall, projecting to the outside and extending in the vertical direction, The first rib is a portion excluding a peripheral portion of the upper surface and the lower surface, and an opposite portion where the upper surface and the lower surface are opposed to the central partition, and is a center of the upper surface and the lower surface. A plurality of the second ribs are arranged in two rows in a horizontal direction parallel to the central partition wall with the facing portion interposed therebetween, and the second rib is a portion excluding the peripheral portion of the right surface and the left surface. A plurality of the first ribs arranged side by side in the horizontal direction parallel to the central partition wall, the number of the first ribs being arranged side by side. More than the number provided side by side, the protruding height at which the second rib protrudes from the right surface and the left surface is higher than the protruding height at which the first rib protrudes from the upper surface and the lower surface. It is characterized by.

  According to the present invention, the first rib is located at the peripheral portion of the upper surface and the lower surface, and the location excluding the opposing location where the upper surface and the lower surface are opposed to the central partition wall, closer to the center of the upper surface and the lower surface, respectively. Provide. The peripheral portions of the upper surface and the lower surface, and the opposed portions are less deformed by internal pressure, and the effect of the ribs is smaller. Therefore, the pressure vessel can be reduced in weight by not providing the first ribs on the peripheral portions of the upper surface and the lower surface, and on the opposing portions. On the other hand, near the center of the upper surface and the lower surface, deformation due to internal pressure is large, and the effect of the ribs is large. Therefore, by providing the first ribs near the center of the upper surface and the lower surface, deformation due to internal pressure can be suitably suppressed. Furthermore, by providing a plurality of first ribs arranged in two rows in the horizontal direction parallel to the central partition wall across the opposite location, deformation due to internal pressure can be more suitably suppressed.

  In addition, the second rib is provided at a portion excluding the peripheral portions of the right surface and the left surface and near the center of the right surface and the left surface. The peripheral portions of the right surface and the left surface are hardly deformed by internal pressure, and the effect of the ribs is small. Therefore, the weight of the pressure vessel can be reduced by not providing the second ribs on the peripheral portions of the right surface and the left surface. On the other hand, near the center of the right and left surfaces, deformation due to internal pressure is large, and the effect of the ribs is large. Therefore, by providing the second rib closer to the center of the right surface and the left surface, deformation due to internal pressure can be suitably suppressed. Furthermore, by providing a plurality of second ribs arranged in the horizontal direction, deformation due to internal pressure can be more suitably suppressed.

  Further, if it is considered that the upper surface and the lower surface are each divided into two by the central partition, the divided surface becomes a long and narrow surface in a direction parallel to the central partition. In such a dividing plane, stress is generated over a wide area in the center. Therefore, by increasing the number of the first ribs arranged side by side as compared with the number of the second ribs arranged side by side, it is possible to suitably reduce the stress generated on the dividing surface.

  Further, assuming that the upper surface and the lower surface are each divided into two by the central partition wall, the right surface and the left surface are the surfaces with the largest area. For this reason, the stress generated in the central portions of the right and left surfaces is larger than the stress generated in the central portions of the upper surface and the lower surface. Therefore, the protrusion height at which the second rib protrudes from the right surface and the left surface is set higher than the protrusion height at which the first rib protrudes from the upper surface and the lower surface, so that the stress generated at the center portions of the right surface and the left surface is suitably obtained. Can be reduced.

  Thus, by optimizing the arrangement location and shape of the first rib and the second rib, it is possible to further reduce the weight while effectively suppressing deformation due to internal pressure.

It is a perspective view of a pressure vessel. It is a fragmentary sectional view of FIG. It is a front view of a pressure vessel. It is the side view which looked at FIG. 1 from the A direction. It is a top view of a pressure vessel. It is a perspective view of the conventional pressure vessel. It is sectional drawing of the conventional pressure vessel. It is a perspective view of the conventional pressure vessel.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Configuration of pressure vessel)
The pressure vessel according to the embodiment of the present invention has a rectangular parallelepiped shape whose interior is divided into two chambers by a central partition wall provided in the vertical direction. Here, the rectangular parallelepiped includes a cube. The pressure vessel of this embodiment is used as an intercooler and an aftercooler of an oil-free compressor, but is not limited to this, and may be an air tank or a fuel tank for a vehicle.

  The pressure vessel 1 is made of metal and has a rectangular parallelepiped shape in which the depth (length in the front-rear direction) is longer than the width (length in the left-right direction) as shown in FIG. 1 which is a perspective view. As shown in FIG. 2, which is a partial sectional view of FIG. 1, the inside of the pressure vessel 1 is divided into two chambers (a right chamber 21 and a left chamber 22) by a central partition wall 2 provided in the vertical direction.

  Returning to FIG. 1, an inlet 11 communicating with the right chamber 21 and an inlet 12 communicating with the left chamber 22 are provided on the upper surface 3 of the pressure vessel 1. Further, an outlet 13 that communicates with the right chamber 21 is provided on the right surface 5 of the pressure vessel 1, and an outlet 14 that communicates with the left chamber 22 (see FIG. 5) on the left surface 6 of the pressure vessel 1 (see FIG. 5). Reference) is provided. In addition, the position of the inflow ports 11 and 12 and the outflow ports 13 and 14 is not specifically limited. Further, the surfaces on which the inlets 11 and 12 and the outlets 13 and 14 are provided are not particularly limited.

  Moreover, the front surface 7 and the rear surface 8 (see FIG. 4) of the pressure vessel 1 are formed with openings 15 through which a tube nest (not shown) passes. The opening 15 is formed for each of the right chamber 21 and the left chamber 22. The tube nest that penetrates the right chamber 21 includes a plurality of tubes through which a fluid that exchanges heat with the fluid introduced into the right chamber 21 flows. The tube nest penetrating the left chamber 22 includes a plurality of tubes through which a fluid that exchanges heat with the fluid introduced into the left chamber 22 flows.

  In such a configuration, the fluid introduced into the right chamber 21 from the inlet 11 performs heat exchange with the fluid flowing through the pipe included in the tube nest penetrating the right chamber 21, and then from the outlet 13. It is discharged outside. The fluid introduced into the left chamber 22 from the inlet 12 is discharged from the outlet 14 to the outside after exchanging heat with the fluid flowing through the pipe included in the tube nest penetrating the left chamber 22. The

  The pressure vessel 1 has a first rib 31 provided on each of the upper surface 3 and the lower surface 4 and a second rib 32 provided on each of the right surface 5 and the left surface 6. The first rib 31 protrudes outward from the surfaces of the upper surface 3 and the lower surface 4 and extends in a direction intersecting the central partition wall 2. This direction includes a direction (left-right direction) orthogonal to the central partition wall 2. The second rib 32 protrudes outward from the surfaces of the right surface 5 and the left surface 6 and extends in the vertical direction.

  The first rib 31 is a portion excluding the peripheral portions of the upper surface 3 and the lower surface 4, and the opposing portions 3 a and 4 a where the upper surface 3 and the lower surface 4 are opposed to the central partition wall 2. 4 is provided near the center.

  Here, the peripheral portions of the upper surface 3 and the lower surface 4 and the opposing portions 3a and 4a are less deformed by the internal pressure, and the effect of the ribs is smaller. Therefore, the pressure vessel 1 can be reduced in weight by not providing the first ribs 31 at the peripheral portions of the upper surface 3 and the lower surface 4 and the opposed portions 3a and 4a. On the other hand, near the center of the upper surface 3 and the lower surface 4, the deformation due to the internal pressure is large, and the effect of the rib is large. Therefore, by providing the first rib 31 near the center of the upper surface 3 and the lower surface 4, it is possible to suitably suppress deformation due to internal pressure.

  Further, on the upper surface 3, a plurality of the first ribs 31 are provided in two rows in the horizontal direction (front-rear direction) parallel to the central partition wall 2 with the facing portion 3a interposed therebetween. In the present embodiment, the first ribs 31 are provided in two rows of six in the front-rear direction across the facing portion 3a. The same applies to the lower surface 4. Note that the number of the first ribs 31 is not limited to this.

  By providing a plurality of first ribs 31 in the front-rear direction, deformation due to internal pressure can be more suitably suppressed.

  The second rib 32 is a portion excluding the peripheral portions of the right surface 5 and the left surface 6, and is provided near the center of the right surface 5 and the left surface 6.

  The peripheral portions of the right surface 5 and the left surface 6 are hardly deformed by internal pressure, and the effect of the ribs is small. Therefore, the pressure vessel 1 can be reduced in weight by not providing the second rib 32 at the peripheral portions of the right surface 5 and the left surface 6. On the other hand, the center of the right surface 5 and the left surface 6 is greatly deformed by the internal pressure, and the effect of the rib is large. Therefore, by providing the second ribs 32 near the center of the right surface 5 and the left surface 6, it is possible to suitably suppress deformation due to internal pressure.

  Furthermore, on the right surface 5, a plurality of second ribs 32 are provided side by side in a horizontal direction (front-rear direction) parallel to the central partition wall 2. In the present embodiment, two second ribs 32 are provided side by side in the front-rear direction. The same applies to the left surface 6. The number of second ribs 32 is not limited to this.

  By providing a plurality of second ribs 32 in the front-rear direction, deformation due to internal pressure can be more suitably suppressed.

  Here, the number (six) of the first ribs 31 arranged in the front-rear direction is larger than the number (two) of the second ribs 32 arranged in the front-rear direction. Yes.

  Assuming that the upper surface 3 is divided into two by the central partition wall 2, the divided surfaces 3 b and 3 b are elongated surfaces in a direction (front-rear direction) parallel to the central partition wall 2. In such divided surfaces 3b and 3b, stress is generated over a wide area in the center. Therefore, by increasing the number of the first ribs 31 provided side by side more than the number of the second ribs 32 provided side by side, the stress generated on the divided surfaces 3b and 3b is suitably reduced. be able to. The same applies to the lower surface 4.

  As shown in FIG. 3 which is a front view, the protruding height a at which the second rib 32 protrudes from the right surface 5 and the left surface 6 is the protruding height at which the first rib 31 protrudes from the upper surface 3 and the lower surface 4. It is set higher than b.

  Assuming that the upper surface 3 and the lower surface 4 are each divided into two by the central partition wall 2, the right surface 5 and the left surface 6 are surfaces having the maximum area. Therefore, the stress generated in the central portions of the right surface 5 and the left surface 6 is larger than the stress generated in the central portions of the upper surface 3 and the lower surface 4. Therefore, the protrusion height a from which the second rib 32 protrudes from the right surface 5 and the left surface 6 is set to be higher than the protrusion height b from which the first rib 31 protrudes from the upper surface 3 and the lower surface 4. The stress generated in the central portion of the left surface 6 can be suitably reduced.

  As shown in FIG. 3, the first rib 31 and the second rib 32 are formed so that the protruding height gradually decreases from the center in the longitudinal direction toward both ends.

  The locations where both ends of the first rib 31 are located are in the vicinity of the peripheral portions of the upper surface 3 and the lower surface 4 and in the vicinity of the opposing locations 3a and 4a, and deformation due to internal pressure is small. On the other hand, the location where the central portion of the first rib 31 is located is the central portion of the dividing surfaces 3b and 4b, and the deformation due to the internal pressure is large. Moreover, the location where the both ends of the 2nd rib 32 are located is the vicinity of the peripheral part of the right surface 5 and the left surface 6, and the deformation | transformation by an internal pressure is small. On the other hand, the location where the central portion of the second rib 32 is located is the central portion of the right surface 5 and the left surface 6 and is greatly deformed by the internal pressure. Therefore, by increasing the protruding height of the central portion of the first rib 31 and the second rib 32, the deformation of the first rib 31 and the second rib 32 can be reduced while suitably suppressing deformation due to internal pressure. By reducing the protruding height, the weight can be further reduced.

  Further, as shown in FIG. 4 which is a side view of FIG. 1 viewed from the direction A, the first rib 31 has a projecting height that gradually decreases from the center in the direction (front-rear direction) orthogonal to the longitudinal direction toward both ends. It is formed to do. Thereby, it is possible to further reduce the weight while suitably suppressing deformation due to the internal pressure.

  Further, as shown in FIG. 5 which is a top view, the second rib 32 is formed so that the protruding height gradually decreases from the center in the direction (front-rear direction) orthogonal to the longitudinal direction toward both ends. Thereby, it is possible to further reduce the weight while suitably suppressing deformation due to the internal pressure.

  Also, as shown in FIG. 4, of the plurality of first ribs 31, the two first ribs 31 located at both ends in the front-rear direction have a protruding height lower than the other first ribs 31. Moreover, the two 1st ribs 31 adjacent to these have the highest protrusion height. That is, if the projecting heights of the two innermost first ribs 31 are “medium”, the projecting heights of the two first ribs 31 located at both ends in the front-rear direction are “low”, The protruding heights of the two first ribs 31 positioned at are “high”. The reason why the projecting heights of the innermost two first ribs 31 are “medium” is that the second ribs 32 adjacent in the circumferential direction ensure sufficient rigidity. As described above, the protrusion height of the plurality of first ribs 31 is set to “middle”, “high”, and “low” from the inside to the outside, so that the deformation due to the internal pressure is suitably suppressed and the weight is lighter. Can be

(Evaluation of displacement and weight)
Next, the displacement amount from the initial shape due to deformation and the weight were compared between the conventional pressure vessel 51 shown in FIG. 7 and the pressure vessel 1 of the present embodiment. Here, the dimensions of the pressure vessel are 430 mm in height, 700 mm in the front-rear direction, and 555 mm in the left-right direction. Further, the displacement amount is the displacement amount at the central portion of the right surface 5 and the left surface 6 when a pressure of 10 MPa is applied. The results are shown in Table 1.

  From Table 1, it can be seen that in the pressure vessel 1 of the present embodiment, the displacement amount is suppressed to about half compared to the conventional pressure vessel 51. Moreover, it turns out that the pressure vessel 1 of this embodiment is 77% of the weight of the conventional pressure vessel 51. FIG. Therefore, it can be seen that the weight can be further reduced while effectively suppressing the deformation due to the internal pressure.

(effect)
As described above, according to the pressure vessel 1 according to the present embodiment, the first rib 31 is formed at the peripheral portions of the upper surface 3 and the lower surface 4, and at the locations where the upper surface 3 and the lower surface 4 face the central partition wall 2. It is a place excluding a certain facing place 3a, 4a, and is provided near the center of the upper surface 3 and the lower surface 4 respectively. The peripheral portions of the upper surface 3 and the lower surface 4 and the opposing portions 3a and 4a are less deformed by the internal pressure, and the effect of the ribs is smaller. Therefore, the pressure vessel 1 can be reduced in weight by not providing the first ribs 31 at the peripheral portions of the upper surface 3 and the lower surface 4 and the opposed portions 3a and 4a. On the other hand, near the center of the upper surface 3 and the lower surface 4, the deformation due to the internal pressure is large, and the effect of the rib is large. Therefore, by providing the first rib 31 near the center of the upper surface 3 and the lower surface 4, it is possible to suitably suppress deformation due to internal pressure. Furthermore, by providing a plurality of the first ribs 31 in two rows in the horizontal direction (front-rear direction) parallel to the central partition wall 2 with the opposing locations 3a, 4a interposed therebetween, deformation due to internal pressure can be more suitably suppressed. it can.

  In addition, the second rib 32 is provided at a position excluding the peripheral portions of the right surface 5 and the left surface 6 and near the center of the right surface 5 and the left surface 6. The peripheral portions of the right surface 5 and the left surface 6 are hardly deformed by internal pressure, and the effect of the ribs is small. Therefore, the pressure vessel 1 can be reduced in weight by not providing the second rib 32 at the peripheral portions of the right surface 5 and the left surface 6. On the other hand, the center of the right surface 5 and the left surface 6 is greatly deformed by the internal pressure, and the effect of the rib is large. Therefore, by providing the second rib 32 closer to the center of the right surface 5 and the left surface 6, deformation due to internal pressure can be suitably suppressed. Furthermore, by providing a plurality of second ribs 32 in the horizontal direction (front-rear direction), deformation due to internal pressure can be more suitably suppressed.

  Further, assuming that the upper surface 3 and the lower surface 4 are each divided into two by the central partition wall 2, the divided surfaces 3 b and 4 b are elongated surfaces in a direction parallel to the central partition wall 2. In such divided surfaces 3b and 4b, stress is generated over a wide region at the center. Therefore, by increasing the number of the first ribs 31 provided side by side more than the number of the second ribs 32 provided side by side, the stress generated on the divided surfaces 3b and 4b is suitably reduced. be able to.

  Further, assuming that the upper surface 3 and the lower surface 4 are each divided into two by the central partition wall 2, the right surface 5 and the left surface 6 are surfaces having the maximum area. Therefore, the stress generated in the central portions of the right surface 5 and the left surface 6 is larger than the stress generated in the central portions of the upper surface 3 and the lower surface 4. Therefore, the protrusion height a from which the second rib 32 protrudes from the right surface 5 and the left surface 6 is set to be higher than the protrusion height b from which the first rib 31 protrudes from the upper surface 3 and the lower surface 4. The stress generated in the central portion of the left surface 6 can be suitably reduced.

  Thus, by optimizing the arrangement location and shape of the first rib 31 and the second rib 32, it is possible to reduce the weight while effectively suppressing deformation due to internal pressure.

  Further, the locations where both ends of the first rib 31 are located are in the vicinity of the peripheral portions of the upper surface 3 and the lower surface 4 and in the vicinity of the opposing locations 3a and 4a, and deformation due to internal pressure is small. On the other hand, the location where the central portion of the first rib 31 is located is the central portion of the dividing surfaces 3b and 4b, and the deformation due to the internal pressure is large. Moreover, the location where the both ends of the 2nd rib 32 are located is the vicinity of the peripheral part of the right surface 5 and the left surface 6, and the deformation | transformation by an internal pressure is small. On the other hand, the location where the central portion of the second rib 32 is located is the central portion of the right surface 5 and the left surface 6 and is greatly deformed by the internal pressure. Therefore, by increasing the protruding height of the central portion of the first rib 31 and the second rib 32, the deformation of the first rib 31 and the second rib 32 can be reduced while suitably suppressing deformation due to internal pressure. By reducing the protruding height, the weight can be further reduced.

  The embodiment of the present invention has been described above, but only specific examples are illustrated, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

DESCRIPTION OF SYMBOLS 1 Pressure vessel 2 Central partition 3 Upper surface 3a Opposing location 3b Dividing surface 4 Lower surface 4a Opposing location 4b Dividing surface 5 Right surface 6 Left surface 7 Front surface 8 Rear surface 11, 12 Inlet port 13, 14 Outlet port 15 Opening 21 Right chamber 22 Left chamber 31 First chamber 1 rib 32 second rib 41 reinforcing rib 51 pressure vessel (gas cooler)

Claims (2)

A rectangular parallelepiped pressure vessel having an interior partitioned into two chambers by a central partition wall provided in the vertical direction,
A first rib provided on each of the upper surface and the lower surface and projecting to the outside and extending in a direction intersecting the central partition;
A second rib provided on each of the right and left surfaces, which are two side surfaces facing the central partition wall, protruding outward and extending in the vertical direction;
Have
The first rib is a portion excluding a peripheral portion of the upper surface and the lower surface, and an opposite portion where the upper surface and the lower surface are opposed to the central partition, and is a center of the upper surface and the lower surface. Closely, a plurality of them are arranged in two rows in a horizontal direction parallel to the central partition wall with the facing portion interposed therebetween,
The second rib is a portion excluding the peripheral portions of the right surface and the left surface, and a plurality of the second ribs are provided side by side in the horizontal direction parallel to the central partition wall, near the center of the right surface and the left surface,
The number of the first ribs provided side by side is greater than the number of the second ribs provided side by side,
A pressure vessel in which the second rib protrudes from the right surface and the left surface is higher than the protrusion height from which the first rib protrudes from the upper surface and the lower surface.   2. The pressure vessel according to claim 1, wherein the first rib and the second rib are respectively formed so that a protruding height gradually decreases from a center in a longitudinal direction toward both ends.

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