WO2008075872A1

WO2008075872A1 - Air exchanger

Info

Publication number: WO2008075872A1
Application number: PCT/KR2007/006614
Authority: WO
Inventors: Hee-Tae Lee
Original assignee: Kim, Seung-Kyoon
Priority date: 2006-12-19
Filing date: 2007-12-18
Publication date: 2008-06-26
Also published as: KR100772086B1

Abstract

An air exchanger is provided. The air exchanger includes a panel case 50 having a cylindrical main mouth 52 that protrudes at the center of the panel case 50; a sub mouth 62 formed symmetrical and corresponding to the main mouth 52 of the panel case 50 to substantially extend the length of the main mouth; a coupling member coupling the sub mouth 62 to the main mouth 52 in one body; a driving motor 80 having a fan blade 82, and a fixing rod 85 fixing the driving motor 80 to the panel case 50. Because the main and sub mouths 52 and 62 are divided, injection molding is possible.

Description

Description AIR EXCHANGER

Technical Field

[1] The present disclosure relates to an air exchanger circulating indoor air, and more particularly, to an air exchanger having a streamlined inner circumference of a discharge port. Background Art

[2] Generally, an air exchanger is installed in a building, a stall, or a factory to circulate indoor air. The air exchanger can be installed on a wall having a ventilating opening, or be hung on a ceiling. Moreover, the air exchanger can stand on a floor.

[3] The general air exchanger circulates air through a mouth 22 formed at the middle of a panel 20 when a fan blade 12 mounted at a motor 10 rotates as illustrated in Fig. 1. Here, the illustrated air exchanger is formed of an iron plate. At this point, the streamlined mouth 22 is molded together with the panel 20. Of course, the panel 20 and the mouth 22 are simultaneously molded by a press die.

[4] The panel 20 includes a frame wall 20a bent perpendicular to a frame. The frame wall 20a can be bent toward a wall 1 as illustrated in Fig. 1. Like this, when the frame wall 20a is bent toward the wall 1, the panel 20 is bolt-fixed at the surface of the wall 1 after a plate spacer S made of rubber or plastic is inserted to the frame. Accordingly, the frame of the panel 20 is supported by the spacer S. At this point, the mouth 22 is inserted into the ventilation opening Ia of the wall 1.

[5] The panel 20 can be installed while being inserted into the ventilation opening Ia of the wall 1. At this point, the frame wall 20a is bolt-fixed at the inner surface of the ventilation opening Ia and fixed at the wall 1 as enlarged in the upper right portion of Fig. 1.

[6] On the other hand, the frame wall 20a can be bent toward an opposite direction of the wall 1 as enlarged in the middle right portion of Fig. 1. When the frame wall 20a is bent toward an opposite position of the wall 1, the panel 20 can be fixed at the wall 1 without the spacer S as illustrated.

[7] The general air exchanger includes a streamlined mouth 22. Accordingly, air discharged by the fan blade 12 smoothly passes through the inner circumference of the mouth 22. Therefore, the general air exchanger does not generate noise caused by the discharged air and has an excellent directionality for ventilated air.

[8] If the mouth 22 is formed in a straight line unlike Fig. 1, air discharged by the fan blade 12 collides with the inner circumference of the mouth 22 and generates vortex due to frictional resistance. Accordingly, the air exchanger with the straight-line mouth 22 generates very noisy sound like "shak-shak", due to air frictional resistance generated by the mouth 22. Additionally, air directionality is drastically decreased when vortex is generated through the air fractional resistance. Therefore, the mouth 22 may have a streamlined shape.

[9] However, because the general air exchanger is formed of an iron plate, its manufacturing process is very complex. Especially, when manufacturing the mouth 22, after drawing a cylindrical shape on an iron plate, the drawn portion is swaged or beaded in a streamlined form. Accordingly, the general air exchanger having the streamlined mouth 22 is very expensive to manufacture. This manufacturing cost repeatedly consumed each time one air exchanger is manufactured.

[10] Furthermore, the general air exchanger manufactured with an iron plate has massive weight and is corroded by rust due to its material property. Accordingly, manufacture, mobility, and installation are very inconvenient, and also permanent usage is actually impossible. Especially, the iron-plate air exchanger can be easily corroded by ammonia, such that it will not last long when being installed in a stable, a laboratory, or a factory.

[11] Moreover, the general air exchanger made of an iron plate has very sharp end parts of the mouth 22 and the frame wall 20a, such that safety accidents often occur while being manufactured and installed.

[12] Of course, the general air exchanger having the streamlined mouth 22 is manufactured using plastic or synthetic resins through injecting molding, such that its manufacturing cost can be drastically reduced and the previously mentioned corrosion and safety accidents can be prevented.

[13] However, the general air exchanger cannot be manufactured through injecting molding because the mouth 22 has a streamlined shape. The reason is that the curved front end part of the mouth 22 is stuck by a mold and thus cannot be ejected when the streamlined mouth 22 is formed.

[14] On the other hand, when the air exchanger is manufactured using plastic, the frame wall 20a is bent toward the outside of the wall 1 as enlarged in the lower right portion of Fig. 1. At this point, the frame 20a protrudes toward a direction opposite to a protruding direction of the mouth 22 as illustrated in the enlarged portion.

[15] Like this, when the air exchanger is formed as illustrated in the enlarged portion, when the panel 20 is formed of plastic or synthetic resins whose rigidity is more fragile than the iron plate, a rib 20b compensating for rigidity needs to be formed as illustrated in the enlarged portion. However, the rib 20b is formed only on the surface of the panel 20 but cannot be formed on the mouth 22. Accordingly, the mouth 22 may be shaken by discharged air and generates noise because of its weak rigidity.

[16] At this point, the rib 20b may be formed up to the inner circumference of the mouth 22 to support the mouth 22. However, when the rib 20b is formed up to the inner surface of the mouth 22, there is friction between air passing through the mouth 22 at high speed and the rib 20b, such that a loud noise occurs.

[17] Furthermore, although the frame wall 20a may be omitted in order to form the streamlined mouth 22, the panel 20 cannot be inserted into the ventilating opening Ia of the wall 1, as enlarged in the upper right portion of Fig. 1.

[18] Additionally, an undescribed reference number 10a is a bar-type fixing rod, and its both ends are bolt-fixed at the motor 10 and the panel 20, respectively. That is, the fixing rod 10a fixes the motor 10 to the panel 20. Accordingly, the motor 10 is fixed at the panel 20 and rotates the fan blade 12. Disclosure of Invention Technical Problem

[19] The present invention is directed to substantially obviate one or more problems of the related art, and an object of the present invention provides an air exchanger having a mouth that is partitioned with respect to its center for easy manufacturing through injection molding, and capable of extending the length of the mouth when the partitioned mouth is coupled.

[20] Additionally, another object of the present invention also provides a new concept air exchanger in which a partitioned mouth is integrated to form a streamlined mouth.

[21] Furthermore, another object of the present invention also provides an air exchanger preventing a mouth's rigidity from weakening even when the mouth is formed of plastic or synthetic resins, by including a member compensating for rigidity in the outer circumference of the mouth that is manufactured through injection molding.

[22] Moreover, another object of the present invention provides an air exchanger capable of screening an outer circumference of a mouth when a pair of cases is symmetrically coupled, because a partitioned mouth and a pair of plate cases that is coupled in a symmetric state can be integrated into one body through injection molding. Technical Solution

[23] The air exchanger of the present invention includes: a panel case having a cylindrical main mouth that protrudes at the center of the panel case and a vent that is formed at the center of the panel case by the main mouth; a sub mouth formed symmetrical and corresponding to the main mouth of the panel case, having a vent at the inner circumference of the sub mouth, and integrated into the main mouth as one body while being symmetrical to the main mouth, in order to be connected to the main mouth and substantially extend the length of the main mouth; a coupling member coupling the sub mouth to the main mouth in one body;

[24] a driving motor circulating air through the vents and of the sub and main mouths and by rotating a fan blade, wherein the fan blade mounted on a driving axis is inserted into the inner circumferences of the sub and main mouths and coupled by the coupling member; and a fixing rod fixing the driving motor to the panel case by connecting the both ends of the fixing rod to the driving motor and the panel case, respectively. Brief Description of the Drawings

[25] Fig. 1 is a cross-sectional view of a general air exchanger.

[26] Fig. 2A is a cross-sectional view of an air exchanger according to a first embodiment of the present invention.

[27] Fig. 3 is a side view of when an air exchanger is used according to a second embodiment of the present invention.

[28] Fig. 4 is a cross-sectional view of an air exchanger according to a third embodiment of the present invention.

[29] Fig. 5 is an exploded perspective view of an air exchanger of Fig. 4.

Best Mode for Carrying Out the Invention

[30] Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, and Fig. 2 is a cross- sectional view of an air exchanger according to a first embodiment of the present invention.

[31] The air exchanger according to the first embodiment of the present invention includes a panel case 50 having a main mouth 52, a sub mouth 62, a coupling member, a driving motor 80, and a fixing rod 85. These components will be described in more detail.

[32] First, the mentioned panel case 50 is a board that is formed of plastic or synthetic resins and is molded through injection molding. That is, the panel case 50 is an injection molded product that actually constitutes the board. At the panel case 50, the hollow cylindrical main mouth 52 protrudes from the center as enlarged in the upper left portion of Fig. 2. Accordingly, a vent 50a is formed at the center of the panel case 50 by the main mouth 52.

[33] In the main mouth 52, a portion connected to the panel case 50 constitutes the fixed end and a portion protruding toward the outside of the panel case 50 constitutes an free end as enlarged in the upper left portion of Fig. 2. That is, at the panel case 50, an opposite end part of the fixed end constitutes the free end.

[34] On the other hand, the main mouth 52 needs to have a curvature as enlarged (in a cross-sectional view) in the upper right portion of Fig. 2. This curvature may be formed corresponding to a half of a cross-sectional semicircle, with respect to a virtual circle C having four quadrants as illustrated in the enlarged portion. That is, the curvature of the main mouth 52 may be formed with an angle corresponding to the fourth quadrant IV of the virtual circuit C. This curvature can have a steeper slope or a gentler slope than that of Fig. 2 if necessary. If the main mouth 52 has a very gentle slope, its curvature may be horizontally formed as it approaches the end part of the free end of the main mouth 52. That is, the main mouth 52 may have the curvature of the free end gentler than that of the fixed end.

[35] Next, the mentioned sub mouth 62 is a hollow cylindrical member as enlarged in the upper left portion of Fig. 2. This sub mouth 62 is formed symmetrically to the main mouth 52 and faces the main mouth 52.

[36] The sub mouth 62 may have a curvature corresponding to when a curvature is formed at the main mouth 52 as enlarged in the upper right portion of Fig. 2. Of course, the curvature of the sub mouth 62 corresponds to the third and fourth quadrants III and IV of the virtual circuit C, such that it corresponds to the curvature of the main mouth 52 as illustrated in the enlarged portion. That is, the sub mouth 62 includes the curvature symmetric to the curvature of the main-mouth 52. Accordingly, the sub mouth 62 corresponds to the main mouth 52.

[37] In the sub mouth 62, its one end is integrated into the protruding other end of the main mouth 52 through a coupling member mentioned later. At this point, the sub mouth 52 and the main mouth 62 are coupled to each other. Accordingly, the length of the main mouth 52 extends substantially by combining with the sub mouth 62.

[38] On the other hand, the main mouth 52 and the sub mouth 62 are coupled to each other by the coupling member when their curvatures are symmetrical to each other as illustrated above, and form a streamlined curvature in a cross-sectional view as enlarged in the upper right portion of Fig. 2. At this point, the main mouth 52 and the sub mouth 62 are combined as in the enlarged portion and form a curvature of a semicircle corresponding to third and fourth quadrants III and IV with respect to the virtual circuit C.

[39] Next, the mentioned coupling member allows the sub mouth 62 to be integrated into the main mouth 52. At this point, the coupling member allows one end of the sub mouth 62 to be integrated into the free end of the main mouth 52. That is, one end of the sub mouth 62 is integrated into one end of the main mouth 52.

[40] This coupling member, for example, is configured to couple the main and sub mouths 52 and 62 through bolting by forming a bolt opening 72a, which a bolt 72 passes through and is coupled to, at the main and sub mouths 52 and 62, as enlarged in the upper left portion (in an exploded perspective view).

[41] At this point, the bolt openings 72a includes bosses at the outer circumferences of the main and sub mouths 52 and 62 as illustrated in the enlarged portion, and also a female screw may be formed in the boss. The bolts 72 sequentially may pass through and couple to the bolt openings 72a of the main and sub mouth 52 and 62 at the rear of the panel case 50 as illustrated in the enlarged portion. That is, the bolt 72 may be coupled to the bolt opening 72a of the sub mouth 62 through the bolt opening 72a of the main mouth 52. However, the bolt 72 can be coupled to the sub mouth 62 unlike the enlarged portion of Fig. 2. That is, the bolt 72 may be coupled to the bolt opening 72a of the main mouth 52 through the bolt opening 72a of the sub mouth 62.

[42] The bolt 72 is coupled to the bolt opening 72a to integrate the main and sub mouths

52 and 62. Of course, the main and sub mouths 52 and 62 are separated when the bolt 72 is unscrewed. That is, the main and sub mouths 52 and 62 can be coupled and separated by the bolt 72.

[43] The coupling member has female and male screw threads S along a circumferential direction at the other outer circumference at the other end of the main mouth 52 and the inner circumference at one end of the sub mouth 62 as enlarged (a cross-sectional view) in the lower left portion of Fig. 2 unlike the above. Therefore, the coupling member can be configured to couple the main and sub mouths 52 and 62 through the screw combination. At this point, the sub mouth 62 rotates and is coupled to the other end of the main mouth 52.

[44] Unlike this, the coupling member, for example, includes a catching protrusion P at the inner circumference of one end of the sub mouth 62 and a catching groove G at the outer circumference of the other end of the main mouth 52 as illustrated in the enlarged portion (a cross-sectional view). Therefore, the main and sub mouths 52 and 62 can be coupled to each other by catching fastener. At this point, after the catching protrusion P is stuck onto the protrusion groove G, its shape may have a right triangle section in order not to be separated from each other as illustrated in the enlarged portion. The catching protrusion P can be formed together with the screw thread S, or can be formed separated from the screw thread S.

[45] Continuously, the driving motor 80 is disposed on the center of the vent 50a at the panel case 50. That is, the driving motor 80 is disposed on the center of the main mouth 52. The fan blade 82 is mounted on the driving axis of the driving motor 80.

[46] The fan blade 82 is inserted into the inner circumferences of the combined main and sub mouths 52 and 62. Accordingly, the axis of the fan blade 82 passes through the combined main and sub mouths 52 and 62.

[47] Lastly, the fixing rod 85 has both ends that are bolted to the driving motor 80 and the main mouth 50, respectively. This fixing member 85 may be formed of a metal pole to have very strong rigidity and a relatively thin thickness.

[48] On the other hand, the panel case 50 can include a frame wall W along the frame during molding as enlarged at the lower right portion of Fig. 2. The frame wall W makes a right angle with the panel case 50 and extends to the frame of the panel case 50. The frame wall W is parallel to the main mouth 52 and extends with the same length as the main mouth 52.

[49] The panel case 50 with the frame wall W can be inserted into the ventilating opening Ia of the wall 1 as enlarged in the upper right portion of Fig. 1. That is, the panel case 50 is inserted into the ventilating opening Ia of the wall 1, such that the panel case 50 is put in the ventilating opening Ia.

[50] Additionally, the panel case 50 may include a boss-type bolt opening BH as enlarged in the lower right portion of the Fig. 2. A bolt B mentioned later is inserted to this bolt opening BH. The bolt B is coupled to the wall 1 of Fig. 1 through the bolt opening BH. Accordingly, the panel case 50 is fixed at the wall 1 by the bolt B.

[51] Moreover, a rib R can be formed at the panel case 50 as enlarged in the lower right portion of Fig. 2. The rib R is formed on the surface of the panel case 50 as one body when the panel case 50 is molded. The rib R is connected to the outer circumference of the main mouth 52 at the panel case 50 as enlarged in the upper left of Fig. 1. Accordingly, the rib R supports the outer circumference of the main mouth 52 to enhance the rigidity of the main mouth 52.

[52] On the other hand, a safety net 99 can be installed at the rear of the panel case 50.

This safety net 99 is bolt-fixed at the rear of the panel case 50 to surround the fan blade 82 of the driving motor 80.

[53] Operations of the air exchanger according to the first embodiment of the present invention will be described with reference to Fig. 2, and during description, an example where the mentioned main and sub mouths 52 and 62 have a streamlined curvature will be used.

[54] The panel case 50 and the sub mouth 62 are separately molded through injection molding. At this point, the main mouth 52, the frame wall W, and the rib R are molded together in the panel case 50. In this panel case 50, the sub mouth 62 is coupled to the main mouth 52. At this point, the lengths of the main and sub mouths 52 and 62 substantially extend.

[55] On the other hand, the main and sub mouths 52 and 62 are separately molded to have respectively symmetric curvatures. Accordingly, the main and sub mouths 52 and 62 are coupled to each other to form a streamlined semicircle in a cross-sectional view.

[56] The driving motor 80 is mounted to the rear of the panel case 50 to which the main and sub mouths 52 and 62 are coupled. The driving motor 80 is fixed at the panel case 50 through the fixing rod 85. At this point, the fan blade 82 of the driving motor 80 is inserted into the main and sub mouths 52 and 62. The fan blade 82 is protected by the safety net 99 at the rear of the panel case 50.

[57] The driving motor 80 rotates the fan blade 82 while being driven. Accordingly, the fan blade 82 suctions indoor air at the rear of the panel case 50 as illustrated in an arrow direction of Fig. 2 while rotating, and then discharges the air at high speed through the vents 50a and 60a of the main and sub mouths 59 and 62. At this point, the main mouth 52 extends by the sub mouth 62 and smoothly guides the indoor air, which is discharged by characteristics of the streamlined form. That is, the main and sub mouths 52 and 62 reduces frictional resistance of the indoor air, discharged at high speed by shape characteristics, to ventilate the indoor air further. Accordingly, the indoor air, ventilated at high speed, is smoothly discharged without noise.

[58] Thus, the indoor air discharged at high speed does not generate vortex because the main and sub mouths 52 and 62 have a streamlined form. Accordingly, the indoor air can maintain directionality to be ventilated extremely further.

[59] On the other hand, the rib R formed at the panel case 50 supports the outer circumference of the main mouth 52 through which the indoor air passes at high speed. Accordingly, the main mouth 52 does not tremble when the indoor air makes friction with the inner circumference.

[60] On the other hand, Fig. 3 is a side view of when an air exchanger is used according to a second embodiment of the present invention, and the air exchanger of the second embodiment is identical to that of the first embodiment except that a leg 90 is installed at the panel case 50 and a safety net 99 is installed at the front of the panel case 50. Accordingly, only this difference will be described in more detail with reference to the accompanying drawing.

[61] The safety net 99 installed at the front of the panel case 50 is identical to that of Fig.

2. Like this, the safety net 99 installed at the front of the panel case 50 protects a sub mouth 62 as illustrated in Fig.3.

[62] The leg 90 installed at the panel case 50 supports its bottom to space the panel case

50 from the ground. This leg 90, for example is made of a pole that is split in two branches. Of course, the leg 90 is mounted on both sides of the panel case 50.

[63] A rotatable caster 96 may be mounted on the bottom of the leg 90. Accordingly, the panel case 50 may be easily moved using the caster 96.

[64] Additionally, an angle adjustor 94 can be installed at the leg 90. For example, the angle adjustor includes a hinge 92 passing through the leg 90 to be fixed at the panel case 50, a guide plate 94a having a guide long hole GH to be attached to the leg 90, and a coupling protrusion 94b passing through the guide long hole GH of the guide plate 94a to be coupled to the panel case 50, as enlarged in the right portion of Fig. 3.

[65] The panel case 50 rotates around the hinge 92 when the coupling protrusion 94b becomes loose. At this point, the coupling protrusion 94b moves along the guide long hole GH. Then, the panel case 50 is fixed in a rotated state when the coupling protrusion 94b becomes tight.

[66] On the other hand, the leg 90 includes a disk-type base 90a and a fixing pole 90b perpendicular to the base 90a and fixed at the bottom of the panel frame 50, as enlarged in the bottom portion of Fig. 3. That is, the leg 90 may be configured to have a leg of a typical fan. Additionally, the leg 90 can be formed of a box form using a metal pole unlike Fig. 3.

[67] On the other hand, Fig. 4 is a cross-sectional view of an air exchanger according to a third embodiment of the present invention, and Fig. 5 is an exploded perspective view of an air exchanger of Fig. 4. The air exchanger of the third embodiment is identical to that of the above embodiment except that the cover case 60 symmetric to the panel case 50 is formed at the sub mouth 62, and a coupling member coupling the sub and main mouths 52 and 62 is formed of an insertion axis 62a and an insertion hole 52a. Accordingly, only the difference will be described with the accompanying drawings.

[68] Referring to Fig. 4, the sub mouth 62 is integrated into the center of the cover case

50 of the air exchanger according to the third embodiment. This cover case 60 is symmetrically formed to the panel case 50 and has the same structure and form as the panel case 50. That is, the cover case 60 is formed of a plate shape, and also a vent 60a is formed at the center of the sub mouth 62 as illustrated in Fig. 4.

[69] The cover case 60 and sub mouth 62 are simultaneously molded. That is, the cover case 60 and the sub mouth 62 are molded together and integrated as one body.

[70] The cover case 60 faces the panel case 50 because the sub mouth 62 is coupled to the main mouth 52 of the panel case 50. That is, the cover case 60 is symmetric to and faces the panel case 50. Accordingly, one side having the main mouth 52 at the panel case 50 is screened by the cover case 60.

[71] The cover case 60 includes a rib R identical to a rib R at the panel case 50. The rib

R is connected to the outer circumference of the sub mouth 62 to enhance rigidity of the sub mouth 62.

[72] The cover case 60 symmetrically faces and is fixed at the panel case 50 through a fixing member mentioned later. At this point, the sub and main mouths 52 and 62 face and are connected to each other. When the sub and main mouths 52 and 62 have respectively symmetric curvatures, they are coupled to each other to form a streamlined curvature of a semicircle in a cross-sectional view.

[73] Here, the fixing member fixing the cover case 60 and panel case 50 includes a through bolt B passing through the cover case 60 and the panel case 50, and a pressure nut coupled to the end part of the through bolt B to press the cover case 60 and the panel case 50. That is, the cover and panel cases 60 and 50 are symmetrically fixed through bolting.

[74] Unlike this, the fixing member, for example, may be configured to form an insertion protrusion 60b at the rear surface of the cover case 60 facing the panel case 50, and an insertion groove 50b at the front surface of the panel case 50 facing the cover case 60, as illustrated in the upper right portion of Fig. 4, such that the cover case 60 and the panel case 50 can be coupled to each other through a tight coupling structure using interference fitting. At this point, the insertion protrusion 60b has an external diameter that is pressed and fixed at the insertion groove 50b. Accordingly, the insertion protrusion 60b is pressed and fixed at the insertion groove 50b by interference fitting.

[75] This insertion protraction 60b and the insertion groove 50b may be used together with the through bolt B and the pressure nut N. Unlike this, only the insertion protrusion 60b and the insertion groove 50b may be applied without the through bolt B and the pressure nut N. That is, the panel and cover cases 50 and 60 may be coupled to each other by the insertion protrusion 60b and the insertion groove 50b without the through bolt B and the pressure nut N.

[76] On the other hand, the main and sub mouths 52 and 62 may be coupled to each other through the same coupling member, as illustrated in an enlarged portion at the left top of Fig. 4. This coupling member, for example, includes an insertion axis 62a at the outer circumference of the sub mouth 62, and an insertion opening 52a at the outer circumference of the main mouth 52, such that the sub and main mouth 62 and 52 can be coupled to each other through a tight coupling structure using interference fitting. At this point, the insertion axis 62a has an external diameter that is pressed and fixed at the insertion groove 52a. Accordingly, the insertion axis 62a is pressed and fixed at the insertion opening 52b by interference fitting.

[77] When the insertion axis 62a and the insertion hole 52a are formed at the main and sub mouths 52 and 62, the insertion protrusion 60b and the insertion groove 50b of the fixing member can be omitted. In more detail, the vents 50a and 60a are fixed by the insertion axis 62a and the insertion opening 52a, and the frame is fixed by the fixing bolt and the pressure nut N at the panel and cover cases 50 and 60 if the insertion protrusion 60b and the insertion groove 50b are omitted. That is, the insertion axis 62a and the insertion opening 52a serve as the fixing member instead of the insertion protrusion 60b and the insertion groove 50b.

[78] As a result, the coupling member of the air exchanger according to the third embodiment is different from that of the air exchanger according to the first embodiment. Of course, the coupling member according to the third embodiment can be replaced with the coupling member according to the second embodiment, and the coupling member according to the second embodiment can be replaced with the coupling member according to the third embodiment. This can be easily understood for those skilled in the art, and thus, its detailed description will be omitted for conciseness.

[79] On the other hand, in the cover case 60, a frame wall W can be formed at the frame as enlarged in the lower left portion of Fig. 4. This frame wall W makes a right angle with the cover case 60 and extends at the frame of the cover case 60.

[80] Referring to Fig. 5, the cover case 60 is fixed and faces the panel case. At this point, the frame wall W of the cover case 60 faces the frame wall W of the panel case 50. Accordingly, the frame wall W screens the frame of the cover case 60. Accordingly, the main and sub mouths 52 and 62 exposes their inner circumferences as illustrated.

[81] On the other hand, the main and sub mouths 52 and 62 face each other and forms a streamlined discharge port through an inner circumference as the panel and cover cases 60 are coupled. That is, a streamlined mouth is formed at the vents 50a and 60a of the panel and cover cases 50 and 60.

[82] On the other hand, the safety net 99 is installed at the front and rear of the cover case 60 and the panel case 50, respectively, to protect the fan blade 82. This safety net 99 can be installed at one of the panel case 50 and the cover case 60.

[83] Operations of the air exchanger according to the third embodiment of the present invention will be described with reference to Fig. 4, and during description, an example where the fixing member includes the through bolt B, the pressure nut N, the insertion protrusion 60b, and the insertion opening 50b together will be used.

[84] As illustrated, in the air exchanger according to the third embodiment, the insertion protrusion 60b and the insertion groove 50b of the fixing member are coupled to each other to integrate the panel and cover cases 50 and 60 as one body. At this point, the insertion axis 62a and the insertion hole 52a are coupled together at the main and sub mouths 52 and 62. Accordingly, the main and sub mouths 52 and 62 are coupled to each other to form a streamlined shape.

[85] Once the insertion protrusion 60b and the insertion groove 50b are coupled, the panel and cover cases 50 and 60 are symmetrically fixed through bolt B and the pressure bolt B of the fixing member.

[86] Next, the driving motor 80 is installed in the panel case 50 through the fixing rod

85. Accordingly, the fan blade 82 of the driving motor 80 is inserted into the main and sub mouths 52 and 62. That is, the fan blade 82 is inserted in the vents 50a and 60a of the panel and cover cases 50 and 60.

[87] Continuously, the safety net 99 is bolt-fixed at the panel and cover cases 50 and 60.

Accordingly, the fan blade 82 is protected by the safety net 99.

[88] In the air exchanger according to the third embodiment, the fan blade is rotated by the driving motor 80 to circulate indoor air through the main and sub mouths 52 and 62.

[89] On the other hand, the air exchanger according to the third embodiment may have the installed leg 90 as illustrated in Fig. 3. Like this, the installing of the legs 90 at the air exchanger can be easily understood for those skilled in the art, and thus, its detailed description will be omitted for conciseness.

[90] On the other hand, since the cover case 60 to which the sub mouth 62 is connected is symmetrically formed to the panel case 50, the panel case 50 having the main mouth 52 can be reversibly used. At this point, the main mouth 52 becomes the sub mouth 62 when being reversibly rotated.

[91] Like this, when the panel case 50 is reversibly used as the cover case 60 by rotating it, the insertion protrusion 60b and the insertion groove 50b of the fixing member need to be formed at the panel and cover cases 50 and 60, respectively, as illustrated. That is, the insertion groove 50b and the insertion protrusion 60b need to be respectively formed at the top and the bottom at the panel case 50, and also the insertion protrusion 60b and the insertion groove 50b need to be respectively formed at the top and bottom of the cover case 60 as illustrated.

[92] Additionally, when the panel case 50 is reversibly used as the cover case 60, the insertion axis 62a and the insertion opening 52a of the coupling member need to be formed at the main and sub mouths 52 and 62, respectively, as illustrated in the enlarged portion. That is, the insertion opening 52a and the insertion axis 62a need to be respectively formed at the top and bottom of the main mouth 52, and also the insertion axis 62a and the insertion opening 52a need to be respectively formed at the top and the bottom of the sub mouth 62 as illustrated in the enlarged portion.

[93] Like this, because the insertion protrusion 60b and the insertion groove 50b, and the insertion axis 62a and the insertion opening 52a are formed at the panel and cover cases 50 and 60, and the main and sub mouths 52 and 62, respectively, the panel case 50 can be reversibly used as the cover case 60. Industrial Applicability

[94] According to the air exchanger of the present invention, a mouth ventilating indoor air is divided into sub and main mouths, which are separated through molding, such that the sub and main mouths can be easily manufactured through injection molding. Additionally, because the main mouth and the sub mouth are coupled to each other, the length of the main mouth can be extended.

[95] Especially, because the air exchanger of the present invention is made of plastic or synthetic resins through injection molding, it is more lighter compared to a related art air exchanger, and also is capable of prevent corrosion. Additionally, according to the air exchange of the present invention, hand injury can be prevented by using the frame wall and an end part of the sub mouth, also the main and sub mouths can be formed in a streamlined shape through injection molding.

[96] Moreover, because the sub and main mouths can be separated from each other through the coupling member, they can be easily replaceable if necessary. [97] Furthermore, because the rib supports the surfaces of the panel and cover cases and the outer circumferences of the sub and main mouths, it can prevent the panel and cover cases, and the sub and main mouths from trembling, which is caused by ventilated air.

[98] Additionally, when the sub mouth and the cover case are made of the same material, the cover case can be symmetrically coupled to the panel case. Therefore, appearance can be neatly and beautifully manufactured. When the frame wall is formed at the frames of the cover and panel cases, the frame wall screens the frames of the cover and panel cases, the compact air exchanger can be manufacture.

[99] Furthermore, because cover and panel cases are coupled by using a fixing member with the through bolt and the pressure nut or the insertion protrusion and the insertion groove, they can be easily coupled to each other and can be easily replaceable if necessary.

[100] Especially, because the cover case and the panel case are symmetrically formed, the panel case can be reversibly used as the cover case if being rotated. Also, manufacturing efficiency and assembly workability can be improved.

[101] Furthermore, when the leg is installed at the panel case, the air exchanger can stand in the room like a fan, and can be easily moved.

Claims

[1] An air exchanger ventilating indoor air, comprising: a panel case 50 having a cylindrical main mouth 52 that protrudes at the center of the panel case 50 and a vent 50a that is formed at the center of the panel case 50 by the main mouth 52; a sub mouth 62 formed symmetrical and corresponding to the main mouth 52 of the panel case 50, having a vent 60a at the inner circumference of the sub mouth 62, and integrated into the main mouth 52 as one body while being symmetrical to the main mouth 52, in order to be connected to the main mouth 52 and substantially extend the length of the main mouth; a coupling member coupling the sub mouth 62 to the main mouth 52 in one body; a driving motor 80 circulating air through the vents 50a and 60a of the sub and main mouths 62 and 52 by rotating a fan blade 82, wherein the fan blade 82 mounted on a driving axis is inserted into the inner circumferences of the sub and main mouths 62 and 52 coupled by the coupling member; and a fixing rod 85 fixing the driving motor 80 to the panel case 50 by connecting the both ends of the fixing rod 85 to the driving motor 80 and the panel case 50, respectively.

[2] The air exchanger of claim 1, wherein the coupling member comprises bolt openings 72a, through which bolts 72 are passes through, at the main and sub mouths 52 and 62 to coupled the main and sub mouths 52 and 62 by bolting.

[3] The air exchanger of claim 1, wherein the coupling member comprises an insertion axis 62a at the outer circumference of the sub mouth 62 and an insertion opening 52a at the outer circumference of the main mouth 52 to couple the sub and main mouths 62 and 52 in a tight coupling structure using interference fitting.

[4] The air exchange of claim 1, further comprising a rib R formed of the same material at the surface of the panel case 50 to be connected to the outer circumference of the main mouth 52.

[5] The air exchanger of claim 1, further comprising: a plate cover case 60 symmetrically facing the panel case 50 and covering one side of the panel case 50 having the main mouth 62, as the sub mouth 62 is connected to the center of the sub mouth 62 as one body to form the vent 60a at the center by the sub mouth 62 and the sub mouth 62 is connected to the main mouth 62; and a fixing member fixing the cover case 60 to the panel case 50 as one body.

[6] The air exchanger of claim 5, further comprising a rib R formed at the surface of the cover case 60 as one body, to which the other end of the sub mouth 62 is connected, to be connected to the outer circumference of the sub mouth 62.

[7] The air exchanger of claim 5, further comprising a frame wall W having the same length as the sub mouth 62 at a frame of the cover case 60 and extending perpendicular to the case 60 to screen the frame of the cover case 60.

[8] The air exchanger of claim 5, wherein the fixing member comprises: a through bolt B passing through the cover case 60 and the panel case 50; and a pressure nut N coupled to the end part of the through bolt B to press the cover case 60 and the panel case 50.

[9] The air exchanger of claim 5, wherein the fixing member comprises an insertion protrusion 60b formed at the surface of the cover case 60 facing the panel case 50, and an insertion groove 50b formed at the surface of the panel case 50 facing the cover case 60 to couple the cover case 60 and the panel case 50 in a tight coupling structure using interference fitting.

[10] The air exchanger of claim of 1, further comprising a leg 90 supporting the panel case 50 to space the panel case 50 from the ground.

[11] The air exchanger of claim 1, further comprising a frame wall W having the same length as the main mouth 62 at a frame of the panel case 50 and extending perpendicular to the case 50 to screen the frame of the panel case 50.

[12] The air exchanger of any one claim of 1 through 11, wherein at least one of the main and sub mouths 52 and 62 comprises a curvature reducing air frictional resistance.

[13] The air exchanger of claim 12, wherein the main and sub mouths 52 and 62 comprise curvatures that are symmetrically formed to each other and having a substantially streamlined curvature when being coupled to each other.