KR100826306B1 - Heat exchange ventilation - Google Patents

Abstract

A heat exchanger is provided to move a selected filter into an air path in a casing under external control and to simplify the replacement of the filters, thereby supplying clean air and improving heat exchanger efficiency. A heat exchanger includes a plurality of filters(39) mounted in a housing(41), and a filter moving part having a filter lifting element mounted in the housing to operate according to an electric signal input from the outside. The filter lifting element moves a selected one among the filters into a casing(35) formed with inlets and outlets via a blocking plate(55) formed with filter-passing holes so as to pass air in the casing through the filter or moving a filter positioned in the casing to the housing via the blocking plate.

Description

Heat exchange ventilation

1 is a perspective view showing the internal configuration of a conventional total heat exchanger.

2 is a side cross-sectional view of the total heat exchanger shown in FIG.

3 is a view showing the internal configuration of the total heat exchanger according to the first embodiment of the present invention.

FIG. 4 is a cutaway perspective view of a portion of the total heat exchanger illustrated in FIG. 3.

5 and 6 are diagrams for explaining the configuration of the filter shown in FIG.

7 is a view showing another type of filter transfer unit that can be applied to the total heat exchanger according to the first embodiment of the present invention.

8 is a cutaway perspective view of a total heat exchanger according to a second embodiment of the present invention.

FIG. 9 is a perspective view illustrating a part of a filter transfer unit applied to the total heat exchanger illustrated in FIG. 8.

FIG. 10 is a diagram illustrating the remaining part of the filter transfer unit shown in FIG. 9.

<Explanation of symbols for the main parts of the drawings>

11: Heat exchanger 13: Casing 15: First fan

15a: intake vent 15b: exhaust vent 17: second fan

17a: exhaust port 17b: intake port 19: heat exchange unit

21a, 21b: filter 23: horizontal bulkhead 25: vertical bulkhead

31: heat exchanger 35: casing 37: guide bracket

39: filter 39a: filter member 39b: filter cassette

39e: Through hole 39f: Filter storage space 41: Housing

41a: flange 41b: bottom 42: screw

43: internal space 45: support block 47: lead screw

49: guide rod 51: transfer block 53: transfer motor

55: main motor 57: blocking plate 57a: filter through hole

58: pinion gear 59: drive gear 60: rack gear

62: roller 63: friction plate 65: lifting plate

67: guide rail 69: bearing 71: screw rod

73: driven gear 75: lifting block 77: expansion and contraction

77a: bar member 77b: roller 77c: pin

77d: unit assembly 79: hinge 81: connecting pin

The present invention relates to a total heat exchanger.

Recently constructed apartments, office buildings or residential complexes maintain very high airtightness to minimize the consumption of heating and cooling energy. Maintaining confidentiality of the building means that no fresh air enters the building.

As is known, various chemicals used in the construction of walls, floors, or ceilings, as well as concrete, are toxic. Therefore, the higher the airtightness of the building, the more ventilation required. And forced ventilation.

There are a wide variety of such ventilation systems, including the total heat exchanger 11 shown in FIG. The total heat exchanger is a mechanical device for forcibly discharging the contaminated air to the outside and at the same time to introduce the fresh air into the room, the heat exchanger and the heat of the inlet air through the heat exchange unit 19 provided therein It also has a function of recovering waste heat by exchange.

1 is a perspective view showing the internal configuration of a conventional heat exchanger, Figure 2 is a side cross-sectional view of the heat exchanger.

As shown in the drawing, the conventional total heat exchanger 11 has a rectangular box shape, and a casing 13 having one inlet port 15a, 17b and one exhaust port 15b, 17a at both ends thereof, and the casing ( 13, a heat exchange unit 19 provided between the first fan 15 and the second fan 17, provided between the first and second fans 15 and 17, and the heat exchange unit ( It consists of the filter 21 arrange | positioned at the left and right of 19).

The second fan 17 supplies external fresh air to the room, and the first fan 15 operates together with the second fan 17 to discharge the contaminated air to the outside.

When the second fan 17 is driven, external air is discharged to the exhaust port 17a through the second fan 17 via the inlet port 15a, the filter 21b, and the heat exchange unit 19. Arrow a in the direction of 2). In addition, when the first fan 15 is driven, indoor air passes through the inlet port 17b, the filter 21b, and the heat exchange unit 19 in order, and is discharged through the first fan 15 to the exhaust port 15b. Arrow b in Fig. 2). As described above, the air entering from the outdoor to the indoor and the air exiting from the indoor to the outdoor are exchanged with each other while passing through the heat exchange unit 19.

In order to enable the flow of air as described above, a horizontal partition 23 and a vertical partition 25 are provided inside the casing 13.

As shown in FIG. 2, the horizontal bulkhead 23 is a plate fixed between both end portions of the heat exchange unit 19 and the first and second fans 15 and 17 to partition the inner space up and down. In addition, the vertical bulkhead 25 is a diaphragm fixed between the upper and lower ends of the heat exchange unit 19 and the inner wall surface of the casing 13, and divides the upper space and the lower space partitioned vertically from side to side. As a result, the peripheral space of the heat exchange unit 19 is divided into four.

On the other hand, the filter (21a, 21b) is to purify the air passing through the casing 13, in particular, the air in the purified state by filtering the air immediately before entering the heat exchange unit 19, the heat exchange unit (19) Pass through).

However, the conventional heat exchanger 11 described above has a problem that its function is rapidly deteriorated when it is used for a long time or when there are many pollutants in the air or other foreign matter is caught in the filters 21a and 21b.

If the filter is not functioning due to foreign matter (if the outdoor air is contaminated air), the contaminated air will be supplied to the room, and the fan (15, 17) will be blown with a load of mechanical efficiency. Falls sharply In addition, the minute air passage formed in the heat exchange unit 19 is also gradually blocked, the flow resistance becomes very large and the heat exchange efficiency is also reduced.

In order to prevent the above phenomenon, the filters 21a and 21b should be frequently replaced. However, unpacking the heat exchanger 11 packaged in the casing 13 and replacing the filters 21a and 21b therein is very cumbersome and requires a professional skill. Even if the heat exchanger is still in operation.

The present invention has been made to solve the above problems, and since a plurality of filters are embedded therein, a selected filter among a plurality of filters can be introduced into the air flow path through external control, so that the filter is contaminated when the filter is contaminated. Simply replaces the filter with a new filter to provide clean air at all times and to provide a total heat exchanger that maintains the best heat exchange effect.

In order to achieve the above object, the present invention provides an inner space, the casing is provided with a pair of inlet and exhaust ports respectively at its both ends, and the inside of the casing and the outside air through the inlet on both sides inside the casing The first and second fans, the heat exchange unit provided between the first fan and the second fan, and the first fan and the second fan to pass through the inside of the casing by being sucked into the furnace and discharged through the opposite exhaust port. In the total heat exchanger including a partition wall for partitioning the flow path of air to pass through the heat exchange unit in a state that the air is not mixed with each other,
The casing may take the form of a rectangular box, and a lower portion of the casing may include a housing having an inner space communicating with the inner space of the casing, and a housing may be detachably attached to the casing. The casing and the inner space of the housing may include air passing through the casing. It is isolated by a blocking plate so that it does not flow into, the heat exchanger; A plurality of filters provided in the housing and a selected filter among the plurality of filters are moved into the casing through the blocking plate so that air passing through the casing passes through the filter, or a filter that is located in the casing is passed through the blocking plate. It is characterized in that it comprises a filter conveying unit which is installed in the inner space of the housing to be taken out into the housing and returned to the inside of the housing and having a filter lifting means operated by an electric signal provided from the outside.
In addition, the filter is located side by side in the interior of the housing, characterized in that the upper end passes through the blocking plate and is exposed to the inner space of the casing to stand by.

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In addition, the filter is in the form of a square plate and fixed to the rack gear or friction plate of a predetermined width extending vertically on one side or both sides, the filter lifting means; A lead screw horizontally fixed to the inner wall surface of the housing, a guide rod parallel to the lead screw and both ends thereof fixed to the housing, a main motor for axially rotating the lead screw, and an axial rotation of the lead screw. It is characterized in that it comprises a feed block which is guided to the guide rod by the horizontal movement, and the pinion gear or friction roller mounted on the transport block and providing a lifting force to the rack gear or the friction plate on the drive shaft .

In addition, the filter lifting means; A lifting plate for supporting the filter horizontally at the lower part of each filter, and a lowering plate installed at the lower part of the lifting plate to raise and lower the selected lifting plate so that the filter enters or descends inside the air flow path in the casing to escape from the air flow path. A lead screw horizontally installed below the lifting plate; A guide rod parallel to the lead screw and fixed at both ends thereof to the housing; A main motor for axially rotating the lead screw; A transfer block guided to the guide rod and horizontally moved according to the axial rotation of the lead screw; A motor mounted to the transfer block; A screw rod installed with the motor in the transfer block and vertically positioned and axially rotated by the rotational force of the motor; The lifting block coupled to the screw rod to move vertically in accordance with the axial rotation of the screw rod, and the horizontal support for the lifting plate to the upper end, but in conjunction with the lifting movement of the lifting block to increase or decrease the lifting plate Characterized in that it comprises a stretchable portion.

In addition, the stretching portion; By connecting a plurality of X-shaped unit assemblies obtained by pin-connecting the central portions of two rod members having a predetermined length, the overall length thereof increases or decreases according to the cross motion of each rod member, and the lowermost unit assembly of the unit assemblies. An intersection of the pins is characterized in that connected to the lifting block.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a side sectional view showing an internal configuration of a total heat exchanger according to a first embodiment of the present invention. Hereinafter, the same reference numerals as the above reference numerals denote the same members having the same function.

Referring to the drawings, the total heat exchanger (31) according to the present embodiment has a casing (35) in the form of a rectangular box and is provided with inlets (15a, 17b) and exhaust ports (15b, 17a) at both ends thereof; A first fan 15 and a second fan 17 installed on both sides of the casing 35, and a heat exchange unit 19 provided between the first and second fans 15 and 17. .

In addition, the housing 41 is mounted to the lower portion of the casing 35. The housing 41 is coupled to the bottom of the casing 35 with a screw 42 and is detachable from the casing 35. To this end, the flange portion 41a bent outward is provided at the edge of the housing 41.

 The housing 41 has an inner space 43 to accommodate a filter transfer unit, a filter, and the like, which will be described later. In particular, the inner space of the casing 35 and the inner space 43 of the housing 41 communicate with each other but are blocked by the blocking plate 57. Without the blocking plate 57, the casing 35 and the housing 41 have one internal space. In order to allow the air flowing in the arrow a or b direction to pass through the heat exchange unit 19, the blocking plate 57 must be provided.

The heat exchange unit 19 is positioned above the blocking plate 57 and passes the air flowing through the casing 35. In particular, in order to guide the air passing through the casing 35 in the arrow a direction and the b direction, horizontal partitions 23 are provided on both sides of the heat exchange unit 19, and vertical partitions 25 are fixed to the upper and lower parts.

Meanwhile, a plurality of filters 39 and selected filters of the filters 39 are sent to the air flow passages in the casing 35 or the filters that are in the air flow passages are provided inside the housing 41. It is equipped with the filter feed part which lowers to).

At least two of the plurality of filters must always be introduced into the air flow passage in the casing 35. One filter is located between the first fan 15 and the heat exchange unit 19, and the other filter is located between the heat exchange unit 19 and the second fan 17.

A guide bracket 37 is provided on the inner wall surface of the casing 35 to guide the lifting movement of each filter 39. The guide bracket 37 accommodates the edge of the filter 39 therein and guides the vertical movement of the filter.

In addition, the plurality of filters 39 located in the housing 41 are waiting in parallel with each other, and an upper end thereof passes through the blocking plate 57 and is exposed to the inner space of the casing 35. To this end, a plurality of filter through holes (57a in FIG. 4) are formed in the blocking plate 57.

FIG. 4 is a partially cut-away perspective view of a portion of the total heat exchanger illustrated in FIG. 3.

As shown, a plurality of filters 39 are waiting side by side in the inner space 43 of the housing 41. The filter 39 is composed of a filter cassette 39b in which a filter storage space (39f in FIG. 5) is formed and a filter member 39a fitted to the filter storage space 39f.

In addition, a rack gear 60 having a predetermined width is vertically fixed to both end portions of the filter cassette 39b. The rack gear 60 meshes with the pinion gear 58, which will be described later, and receives lifting force from the pinion gear 58 according to the driving of the transfer motors 53a and 53b.

In some cases, the rack gear 60 may be mounted only at one end of the filter cassette 39b. In such a case, the filter of the group close to the first fan 15 on the heat exchange unit 19, for example, is located at the left end of the filter cassette, and the filter of the group close to the second fan 17 is at the right end of the filter cassette. The rack gear 60 can be fixed.

On the other hand, the filter transfer portion is supported on the inner wall surface of the housing 41 serves to select the filter 39 and to raise and lower the selected filter 39. In this embodiment, all four sets of filter transfer parts are provided. Each filter transfer part has the same structure.

The filter transfer part places the filters located on opposite sides of each other with respect to the heat exchange unit 19 shown in FIG. 3 one by one inside the casing 35 or the filter 39 located in the casing 35. Return to the inside of 41).

The filter transfer part includes a support block 45 fixed to an inner wall surface of the housing 41 and spaced apart from each other, a lead screw 47 supported at both ends by the support block 45, and capable of being axially rotated; The guide rod 49 is parallel to the screw 47 and both ends thereof are fixed to the support block 45 and linearly move along the longitudinal direction of the guide rod 49 by the axial rotation of the lead screw 47. A rack of a filter 39 selected from a transport block 51, a transport motor 53 mounted to the transport block 51 and operated by an electric signal provided from the outside, and fixed to a drive shaft of the transport motor 53. And a pinion gear 58 meshing with the gear 60.

The lead screw 47 is axially rotated by the main motor 55 to move the respective transfer blocks 51 in the horizontal direction so that the pinion gear 58 meshes with the rack gear 60 of the selected filter. The main motor 55 and the transfer motor 53 operate by electric signals provided from the outside.

In particular, the pinion gear 58 stops in engagement with the rack gear 60 of the filter entering the interior (air flow path) of the casing 35 to maintain the filter at the corresponding position. At this time, since the pinion gear 58 reverses due to the weight of the filter 39 and the filter 39 can be lowered to the housing, the transfer motors 53a and 53b use a motor having a built-in brake.

On the other hand, in order to replace the filter that was filtering the air in the casing 35 with another filter, first the pinion gear 58 is rotated in reverse to move the used filter 39 to the inside of the housing 41, The main motor 55 is driven to horizontally move the transfer block 51 so that the pinion gear 58 meshes with the rack gear 60 of the desired filter.

If the pinion gear 58 is meshed with the rack gear 60 of the new filter 39, the feed motor 53 is driven to move the filter 39 into the casing 35. If a new filter 39 is introduced into the air flow path in the casing, the transfer motor 53 is stopped and maintained (until the filter is replaced again).

5 and 6 are diagrams for explaining the configuration of the filter shown in FIG.

As shown, the filter 39 used in the total heat exchanger according to the present embodiment has a constant thickness (to allow sliding movement inside the guide bracket 37 in FIG. 3) and has a filter storage space 39f. It consists of a filter cassette 39b and a filter member 39a fitted in the filter storage space 39f.

The filter member 39a takes the form of a square plate having a predetermined thickness and filters dust or other contaminants in the air while passing the air in the thickness direction. The filter member 39a itself is a known one, and for example, a yellow sand filter anion filter antibacterial filter vitamin filter and the like can be applied.

The filter storage space 39f of the filter cassette 39b is also opened to the side through the through hole 39e. The through hole 39e is a passage provided so that air flowing through the casing 35 can pass through the filter member 39a in the thickness direction.

In addition, the rack gear 60 is fixed to both side surfaces of the filter cassette 39b. The rack gear 60 is firmly fixed to the filter cassette 39b to transmit the power of the pinion gear 58 to the filter cassette 39b.

FIG. 7 is a view illustrating another type of filter transfer unit applicable to the total heat exchanger according to the first embodiment of the present invention, in which the rack gear and the pinion gear are replaced with the friction plate 63 and the roller 62. FIG. Shows that it can.

As shown, the friction plate 63 is fixed to both thickness surfaces of the filter cassette 39b, and the drive shaft of the transfer motor 53 is provided with a roller 62 in close contact with the friction plate 63. The friction plate 63 is a rubber plate having a predetermined width and thickness. In addition, the roller 62 is a rubber or synthetic resin roller in close contact with the friction plate 63 to transfer the rotational force of the transfer motor 53 to the friction plate 63. As long as it is possible to transfer the rotational torque of the transfer motor 53 to the filter 39, the form or material of the friction plate 63 and the roller 62 can be changed as much as possible.

8 is a cutaway perspective view of a total heat exchanger according to a second embodiment of the present invention.

Referring to FIG. 8, it can be seen that the total heat exchanger of the second embodiment includes a lifting plate 65 that horizontally supports the filter 39 at the bottom of each filter 39. The elevating plate 65 is a rectangular plate that horizontally supports the filter 39 and is vertically elevated by a filter transfer unit to be described later.

When the elevating plate 65 is lifted up by the filter feeder, the filter 39 supported by the elevating plate 65 passes upward through the blocking plate 57 to reach the air flow path in the casing 35. In addition, as shown, the upper end of the filter 39 protrudes to the upper portion of the blocking plate 57 through the filter through hole 57a of the blocking plate 57 in the state where the lifting plate 65 is lowered to the maximum. That's enough.

In addition, each of the elevating plate 65 is horizontally spaced apart from the bottom portion 41b of the housing 41, the lower portion is provided with a filter transfer unit shown in Figs.

FIG. 9 is a perspective view illustrating a part of a filter transfer unit applied to the total heat exchanger illustrated in FIG. 8.

As shown, the bottom portion 41b of the housing 41 is provided with two sets of filter transfer units (of the same configuration) for selectively raising the plurality of lifting plates 65.

The filter transfer part includes a guide rod 49 extending in a direction orthogonal to the lifting direction of each filter 39 and both ends thereof are fixed to the support block 45, and parallel to the guide rod 49 and the support block. The lead screw 47 and the guide rod 49 and the lead screw 47 are passed through the guide screw 49 and the guide rod 49 in the axial rotation of the lead screw 47. The feed block 51 is transferred in the longitudinal direction of the main motor 55 for axially rotating the lead screw 47.

In addition, each transfer block 51 is provided with a transfer motor 53. The transfer motor 53 is for vertically elevating the selected elevating plate 65, and has a drive gear 59 on the drive shaft. As a result, the two lifting motors 53 are moved along the longitudinal direction of the guide rod 49 by the operation of the main motor 55 and can be positioned below the desired lifting plate. Each of the main motors 55 and the transfer motors 53 are independently driven by electric signals transmitted from the outside.

On the other hand, each of the transfer block 51 is further provided with a vertical screw rod 71 and the driven gear (73). Like the lead screw, the screw rod 71 is a rod having a male thread formed on an outer circumferential surface thereof, and the lower end thereof is vertically positioned relative to the bearing 69. Of course, there should be a separate support for supporting the screw rod 71 vertically.

In addition, the driven gear 73 is a gear fixed to the screw rod 71 and has the same central axis of rotation as the screw rod 71 and meshes with the drive gear 59. Therefore, when the transfer motor 53 is driven, the screw rod 71 is rotated.

In addition, the lifting block 75 is engaged with each of the screw rods 71. The lifting block 75 is a member moving up and down according to the axial rotation of the screw rod 71, and is linked to the expansion and contraction portion 77 shown in Figure 10 through a connecting pin (81 in Figure 10).

Guide rails 67 are installed at the side of the transfer path of each transfer block 51. The guide rail 67 extends in parallel with the guide rod 49 and accommodates a hinge (79 of FIG. 10) to be described later to guide the sliding motion therein.

FIG. 10 is a diagram illustrating the remaining part of the filter transfer unit shown in FIG. 9.

Referring to the drawings, it can be seen that the expansion and contraction portion 77 is installed below the lifting plate (65). The stretchable portion 77 is known, and the plurality of rod members 77a having a predetermined length are connected to the pins 77c in an X shape, and the ends of the X-shaped unit assemblies 77d connected by the pins are adjacent to each other. It is connected to the end of the other unit assembly (77d) and the pin (77c), the overall length is increased or shortened by the cross-movement of the rod member (77a).

A roller 77b is provided on the upper end side of the expansion and contraction portion 77. The roller 77b abuts on the bottom surface of the elevating plate 65 and moves in the bottom surface of the elevating plate 65 during expansion and contraction of the elastic unit 77. In the figure, the lifting plate 65 is shown to simply be raised on the expansion unit 77, the expansion unit 77 and the lifting plate 65 is stably linked through the necessary supporter or other supporting means known.

In addition, a hinge 79 supported by the guide rail 67 is provided at the lower end of the elastic part 77. The hinge 79 is pinned to the rod member 77a at the bottom of the elastic part 77 and is slidably movable on the guide rail 67. The guide rail 67 supports the hinge 79 to be slidably movable in a fixed state to the bottom portion 41b so that the elastic portion 77 moves together with the transfer motors 53a and 53b.

In particular, the guide rail 67 serves to hold the expansion and contraction portion 77 itself does not rise when the expansion and contraction portion 77 receives the force in the direction of the arrow f by the elevating block (75). Without the hinge 79 or the guide rail 67, the expansion and contraction portion 77 is not able to move up or down with the lifting block 75, the original stretching movement.

The lifting block 75 is connected to the intersection of the lowermost unit assembly 77d of the expansion and contraction portion 77 through the connecting pin 81. Therefore, when the lifting block 75 is raised in the direction of the arrow f (expanding according to the inherent operating characteristics of the expansion and contraction portion), the extension portion is increased in length and moves the lifting plate 65 upward. The elevation of the elevating plate 65 means that the filter 39 enters the air flow path inside the casing 35. When the lifting block 75 is moved downward, the length of the expansion and contraction unit 77 is shortened, and the lifting plate 65 is lowered so that the filter 39 returns to the inside of the housing 41.

As mentioned above, although this invention was demonstrated in detail through the specific Example, this invention is not limited to the said Example, A various deformation | transformation is possible for a person with ordinary knowledge within the scope of the technical idea of this invention. .

The electrothermal heat exchanger of the present invention made as described above may include a plurality of filters in the interior thereof, but the selected filter among the plurality of filters may be introduced into the air flow path through external control. Simply replace it with a new filter to always provide clean air and maintain the best heat exchange efficiency.

Claims (5)

A casing provided with a pair of inlet and exhaust ports at both ends thereof, and provided inside the casing, and sucking outside air into the casing through the inlet ports on both sides, and exhausting through the opposite exhaust port. The heat exchange unit provided between the first and second fans, the heat exchange unit provided between the first fan and the second fan, and the air passing through the casing by the first fan and the second fan is not mixed with each other. In a total heat exchanger comprising a partition for partitioning the flow path of air to pass through the unit, The casing takes the form of a rectangular box and a lower portion of the casing has a housing having an internal space communicating with the internal space of the casing, and is detachably provided with respect to the casing. The inner space of the casing and the housing are isolated by a blocking plate to prevent air passing through the casing from entering the housing. The total heat exchanger; A plurality of filters provided in the housing, The selected filter among the plurality of filters is moved into the casing through the blocking plate so that air passing through the casing passes through the filter, or the filter located in the casing is pulled into the housing through the blocking plate and returned to the housing. Electrothermal heat exchanger is installed in the inner space of the filter comprising a filter transfer unit having a filter lifting means for operating by an electrical signal provided from the outside. The method of claim 1, The filter is located side by side in the interior of the housing, the heat exchanger, characterized in that the upper end passes through the blocking plate and the atmosphere exposed to the inner space of the casing. The method of claim 2, The filter is in the form of a square plate and fixed to the rack gear or friction plate of a predetermined width extending vertically on one side or both sides, The filter lifting means; A lead screw fixed horizontally to an inner wall of the housing; A guide rod parallel to the lead screw and fixed at both ends thereof to the housing; A main motor for axially rotating the lead screw; A transfer block which is guided to the guide rod by horizontal rotation of the lead screw and moves horizontally; And a motor mounted to the transfer block and having a pinion gear or a friction roller for providing a lifting force to the rack gear or the friction plate on the driving shaft. The method of claim 2, The filter lifting means; A lifting plate which supports the filter horizontally at the bottom of each filter, Is installed in the lower portion of the elevating plate and ascends the selected elevating plate to allow the filter to enter or descend the air flow path in the casing to escape from the air flow path, A lead screw installed horizontally under the lifting plate; A guide rod parallel to the lead screw and fixed at both ends thereof to the housing; A main motor for axially rotating the lead screw; A transfer block guided to the guide rod and horizontally moved according to the axial rotation of the lead screw; A motor mounted to the transfer block; A screw rod installed with the motor in the transfer block and vertically positioned and axially rotated by the rotational force of the motor; A lifting block coupled to the screw rod to vertically move according to the rotation of the screw rod; An upper heat exchanger for supporting the elevating plate horizontally, including an expansion unit for raising or lowering the elevating plate by stretching in conjunction with the elevating movement of the elevating block. The method of claim 4, wherein The stretching portion; By connecting a plurality of X-shaped unit assemblies obtained by pin-connecting the central portions of two rod members having a predetermined length, the overall length thereof increases or decreases according to the cross motion of each rod member, and the lowermost unit assembly of the unit assemblies. The cross section of the heat exchanger, characterized in that the pin is connected to the lifting block.

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