Printed circuit board type heat exchanger that is easy to prevent and remove icing

Abstract

The present invention discloses a printed circuit board type heat exchanger that is easy to prevent and remove icing. More specifically, the printed circuit board type heat exchanger that is easy to prevent and remove icing prevents the stacked substrates from icing by arranging the flow paths of glycol water for heat exchange in an overlapping manner, and further supplies glycol water through a plurality of ports to easily remove the generated icing. The printed circuit board type heat exchanger of the present invention includes a housing, a main port through which a heated fluid flows in and out, a sub-port through which a heating fluid flows in and out, and a stacked substrate type channel unit that is disposed inside the housing and has flow paths formed therein. The sub-port includes: an inflow sub-port that is formed on one side of the housing and is formed by dividing it into a first inflow sub-port and a second inflow sub-port; and an exhaust sub-port that is formed on the other side of the housing and is formed opposite to the first inflow sub-port.

Description

Technical Field

[0001] The present invention discloses a printed circuit board type heat exchanger that can easily prevent and remove icing. Specifically, the printed circuit board type heat exchanger that can easily prevent and remove icing overlaps the flow paths of the heating fluid for heat exchange to prevent the stacked substrates from icing, and can also easily remove the generated icing. Background Art

[0002] A heat exchanger is used to cool or heat a specific fluid and cause a phase change thereof. Generally, heat exchange is performed by overlapping multiple fluids having different temperatures.

[0003] Recently, since LNG is used as a ship fuel, a heat exchange device has become more important for heating liquefied LNG. At the same time, stable operation and improved efficiency are also required. Therefore, a printed circuit board type heat exchanger (PCHE) has been developed. In this heat exchanger, multiple plates are laminated and joined. Flow paths for the fluid to be heated are formed on one side of the plates, and flow paths for the heating fluid are formed on the other side of the plates, increasing the heat transfer area and performing heat exchange.

[0004] The development of the printed circuit board type heat exchanger has enabled miniaturization and weight reduction of the heat exchanger, thereby improving the space utilization rate, facilitating operation, and also improving the heat exchange efficiency.

[0005] However, since the flow paths of the printed circuit board type heat exchanger are formed as micro flow paths, blockage may occur. More specifically, the heating fluid often freezes (icing) due to the low temperature influence from the fluid to be heated.

[0006] In particular, if the heating fluid is not continuously supplied to the heat exchanger, for example, if the operation of the heat exchanger is interrupted, the possibility of icing increases, and the operation efficiency of the heat exchanger decreases because the icing in the blocked flow path needs to be removed when restarting the operation.

[0007] Moreover, when the icing causes blockage of the flow path, it not only reduces the performance of the heat exchanger, but also may cause equipment failure due to the solidification of the icing, and further cause the entire system to stop.

[0008]

Prior Art Documents

[0009]

Patent Documents

[0010] (Patent Document 1) KR10-1903663B1

[0011] (Patent Document 2) KR10-2073625B1 Summary of the Invention

[0012] The present invention aims to solve the above problems. The object of the present invention is to provide a printed circuit board type heat exchanger that can easily prevent and remove icing. The printed circuit board type heat exchanger recovers the heating fluid to prevent icing on the stacked printed circuit boards, and can also easily remove the icing by means of the added heating fluid supply pipeline, thereby improving the heat exchanger efficiency and enabling stable operation.

[0013] The object of the present invention is not limited to the previously mentioned object, and other objects not mentioned above can be clearly explained from the following description.

[0014] The printed circuit board type heat exchanger that can easily prevent and remove icing of the present invention can achieve the above object. The printed circuit board type heat exchanger includes a housing, a main port for allowing the heated fluid to flow in and out, a sub-port for allowing the heating fluid to flow in and out, and a substrate stacked channel unit disposed in the housing and having a flow path formed therein. The sub-port includes an inlet sub-port formed on one side of the housing and divided into a first inlet sub-port and a second inlet sub-port; and a discharge sub-port formed on the other side of the housing and formed opposite to the first inlet sub-port. The channel unit includes a main board having a main flow path formed therein for communicating with the main port and allowing the heated fluid to pass through; a first board stacked above and below the main board and having a first flow path formed therein with an inlet side communicating with the first inlet sub-port and an outlet side communicating with the second inlet sub-port and allowing the heating fluid to pass through; and a second board stacked outside the first board and having a second flow path formed therein with an inlet side communicating with the second inlet sub-port and an outlet side communicating with the discharge sub-port.

[0015] Moreover, the second inlet sub-port is further provided with an openable and closable valve.

[0016] Moreover, incremental sleeves are provided on the upper and lower parts of the housing, and the incremental sleeves communicate with the second inlet sub-port and the discharge sub-port.

[0017] Moreover, the printed circuit board type heat exchanger of the present invention that can achieve the above object and is easy to prevent and remove icing includes a housing, a main port through which the heated fluid flows in and out, a sub-port through which the heating fluid flows in and out, and a substrate laminated channel unit disposed inside the housing and having a flow path formed therein. The sub-port includes: a first inflow sub-port formed on one side of the housing; and a discharge sub-port formed on the other side of the housing, opposite to the first inflow sub-port. The channel unit includes: a main board having a main flow path formed therein for communicating with the main port and allowing the heated fluid to pass through; a first board overlapped above and below the main board, having a first flow path formed therein with an inlet side communicating with a first inflow sub-header provided in the first inflow sub-port and an outlet side communicating with a second inflow sub-header formed differently from the first inflow sub-header and allowing the heating fluid to pass through; and a second board overlapped outside the first board, having a second flow path formed therein with an inlet side communicating with the second inflow sub-header and an outlet side communicating with the discharge sub-port.

[0018] Moreover, an increment sleeve is further provided at the upper and lower parts of the housing, and the increment sleeve communicates with the second inflow sub-header and the discharge sub-port.

[0019] Moreover, the first flow path is formed in a zigzag shape.

[0020] Moreover, the second flow path is formed in a straight line shape.

[0021] The present invention configured as described above can achieve the following effects.

[0022] When the heat exchanger operates, the heating fluid is first cooled due to the low temperature of the heated fluid, but is heated by the recovered heating fluid, thereby preventing icing from occurring.

[0023] As described above, the present invention can prevent icing that causes the occlusion or narrowing of the micro flow path, thereby improving the performance of the heat exchanger and enabling stable operation.

[0024] In a ship where a heat exchanger is mainly used, it is very important to maintain the equipment operation rate as much as possible. By improving the operation rate, the effects of significantly reducing the operation cost and energy consumption LOSS can be achieved.

[0025] The present invention is provided with a plurality of ports for allowing the heating fluid to flow in, and one side of the port can be opened and closed. Therefore, once icing occurs, the heating fluid can be quickly supplied to quickly remove the icing.

[0026] The equipment usually does not operate continuously but repeatedly operates and stops discontinuously. Since the maximum load occurs when the equipment switches from the stop state to the operation state, the hysteresis phenomenon caused by icing may become a major problem when the heat exchanger is restarted.

[0027] The further formed heating fluid inlet port can be opened and closed by a valve. Therefore, when restarting, the heating fluid can be rapidly increased to remove the generated ice, so there will be no lag phenomenon during restarting.

[0028] In particular, the lag phenomenon occurring during restarting will increase the instantaneous load borne by the surrounding devices. The present invention can rapidly remove the ice causing this phenomenon, thus significantly reducing the failures of the surrounding devices, and this effect further enhances the effect of the present invention.

[0029] Moreover, the increment sleeves for increasing the heat capacity are sleeved on the upper and lower parts of the casing to sufficiently accommodate the low temperature of the heated fluid, so that the occurrence of ice formation and the removal of ice can be prevented more rapidly and easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a perspective view of a printed circuit board type heat exchanger that can easily prevent and remove ice formation according to a preferred embodiment of the present invention.

[0031] Figure 2 It is an overall structural diagram of a casing according to a preferred embodiment of the present invention.

[0032] Figure 3 It is a structural diagram showing an increment sleeve according to a preferred embodiment of the present invention.

[0033] Figure 4 It is an internal structural diagram of a channel unit according to a preferred embodiment of the present invention.

[0034] Figure 5 It is a structural diagram showing the stacked structure of a channel unit according to a preferred embodiment of the present invention.

[0035] Figure 6 It is a perspective view of a printed circuit board type heat exchanger that can easily prevent and remove ice formation according to another preferred embodiment of the present invention.

[0036] DESCRIPTION OF THE REFERENCE NUMERALS

[0037] 100: Casing 200: Main port

[0038] 210: Main head 300: Sub-port

[0039] 310: First inlet sub-port 311: First inlet sub-head

[0040] 330: Second inlet sub-port 331: Second inlet sub-head

[0041] 350: Discharge sub-port 351: Discharge sub-head

[0042] 400: Channel unit 410: Main board

[0043] 411: Main flow path 430: First plate

[0044] 431: First flow path 450: Second plate

[0045] 451: Second flow path 500: Valve

[0046] 600: Incremental sleeve 610: Partition wall Detailed implementation mode

[0047] The following will describe in detail a preferred embodiment of the present invention, a printed circuit board type heat exchanger that can easily prevent and remove icing, with reference to the accompanying drawings.

[0048] Figure 1 is a perspective view of a printed circuit board type heat exchanger that can easily prevent and remove icing according to a preferred embodiment of the present invention, Figure 2 is an overall structure diagram of a housing according to a preferred embodiment of the present invention, Figure 3 is a structure diagram showing an incremental sleeve according to a preferred embodiment of the present invention, Figure 4 is an internal structure diagram of a channel unit according to a preferred embodiment of the present invention and Figure 5 is a structure diagram showing a stacked structure of a channel unit according to a preferred embodiment of the present invention.

[0049] A printed circuit board type heat exchanger that can easily prevent and remove icing according to a preferred embodiment of the present invention may include a housing 100, a main port 200, a sub-port 300, and a channel unit 400 as shown in the figure.

[0050] First, the housing 100 will be described.

[0051] The housing 100 generally refers to an appearance that can provide a space for housing other elements. In the present invention, it refers to a structure that can provide a space for housing the subsequent channel unit 400 and has a main port 200 and a sub-port 300 for supplying heated fluid and heating fluid on one side thereof.

[0052] The housing 100 can adopt various structural forms. As described above, considering the ease of processing of the channel unit 400 due to its internal housing of the channel unit 400, a right-angled hexahedron shape is preferred. It will be assumed to be a right-angled hexahedron shape in the following description.

[0053] Incremental sleeves 600 with a zigzag flow path formed inside can be provided at the upper and lower parts of the housing 100, which will be described later.

[0054] Next, the main port 200 and the sub-port 300 will be described.

[0055] The port is a general term for elements that allow fluid to flow in and out, and can be divided into a main port 200 for supplying heated fluid and a sub-port 300 for supplying heating fluid.

[0056] The main port 200 and the sub-port 300 are formed to be installable on one side surface of the housing 100. Preferably, the main port 200 and the sub-port 300 can be installed on mutually perpendicular surfaces of the housing 100.

[0057] Specifically, if the main port 200 is installed on two opposite surfaces among the four side surfaces of the housing 100, the sub-port 300 is installed on the remaining two surfaces perpendicular thereto. As a result, the main port 200 and the sub-port 300 are perpendicular to each other.

[0058] The main port 200 is used to supply the heated fluid and can be directly connected to the main board 410 of the later-described channel unit 400. The inflow side and the discharge side can be configured in the same form.

[0059] The main port 200 is generally formed in the shape of a pipe. Therefore, in order to allow the heated fluid to flow in and out evenly, a main head 210 can be provided between the main port 200 and the housing 100.

[0060] The sub-port 300 is used to supply the heating fluid. As described above, it is arranged perpendicular to the main port 200 and installed on the housing 100, and can be directly connected to the later-described first board 430 and second board 450.

[0061] Different from the main port 200, the inflow side of the sub-port 300 is divided into a first inflow sub-port 310 and a second inflow sub-port 330, and the discharge side only has a discharge sub-port 350, which can be in different forms.

[0062] Due to the morphological characteristics, both the first inflow sub-port 310 and the second inflow sub-port 330 are formed on one side surface of the housing 100, and the discharge sub-port 350 can be formed on the other side surface of the housing 100 and is arranged opposite to the first inflow sub-port 310.

[0063] The first inflow sub-port 310 is directly connected to the later-described first board 430 but is limited to be connected to the inlet side of the first board 430. The second inflow sub-port 330 can be connected to the outlet side of the first board 430 and the inlet side of the second board 450, and the discharge sub-port 350 can be connected to the outlet side of the second board 450.

[0064] A head can also be provided between the sub-port 300 and the housing 100. The first inflow sub-head 311 and the second inflow sub-head 331 are independently formed in a non-connected manner, and the discharge sub-head 351 can be formed opposite to the first inflow sub-head 311 in the same form.

[0065] Next, the channel unit 400 will be described.

[0066] The channel unit 400 is composed of stacked printed circuit boards, which means that a fluid movement path is formed, and the fluid flows in and out from the main port 200 and the sub-port 300.

[0067] Due to the form of the stacked printed circuit boards, heat exchange occurs between the heated fluid moving in the flow path formed in the channel unit 400 and the fluid.

[0068] The channel unit 400 can be formed by being divided into a main board 410, a first board 430, and a second board 450 and is in a stacked form.

[0069] The main board 410 is formed to communicate with the main port 200 and allow the heated fluid to pass through, and a main flow path 411 for guiding the movement of the heated fluid can be formed on its surface.

[0070] Specifically, the main flow path 411 is formed in a micro-channel form on the surface of the main board 410, and can usually be formed by an etching process. The following first flow path 431 and second flow path 451 can also be formed by the same method.

[0071] The main flow path 411 and the main port 200 are formed in the same direction and can be configured in a straight line from the main port 200 on the inflow side to the main port 200 on the discharge side.

[0072] The first board 430 is formed to allow the heating fluid to pass through, and is overlapped and arranged above and below the main board 410, and can function to allow the heated fluid to exchange heat with the heating fluid for the first time.

[0073] A first flow path 431 can be formed on the surface of the first board 430. The inlet side of the first flow path 431 can communicate with the first inflow sub-port 310 through the first inflow sub-header 311, and the outlet side can communicate with the second inflow sub-port 330 through the second inflow sub-header 331.

[0074] In view of the structure in which the first inflow sub-port 310 and the second inflow sub-port 330 are formed on the same side of the housing 100, the inlet side and the outlet side of the first flow path 431 can also be formed on the same side. Specifically, the first flow path 431 can be formed in a zigzag shape.

[0075] The zigzag structure of the first flow path 431 can maximize the heat transfer area between it and the main flow path 411 and improve the heat exchange efficiency. The first board 430 is overlapped and arranged above and below the main board 410, so that the heated fluid passing through the main flow path 411 can more efficiently exchange heat with the first flow path 431 located above and below.

[0076] The second board 450 can be overlapped and arranged outside the first board 430.

[0077] The second plate 450 may be formed with a second flow path 451 on its surface. The inlet side of the second flow path 451 may communicate with the second inlet sub-port 330, and the outlet side may communicate with the discharge sub-port 350.

[0078] As described above, the outlet side of the first flow path 431 and the inlet side of the second flow path 451 are both formed to communicate with the second inlet sub-port 330. As a result, a configuration can be formed in which the heated fluid discharged from the first flow path 431 is recovered by the inlet of the second flow path 451.

[0079] The outlet side of the second flow path 451 communicates with the discharge sub-port 350. Therefore, the inlet and outlet of the second flow path 451 can be formed on opposite sides. Specifically, the second flow path 451 can be formed such that a plurality of micro flow paths are perpendicular to the direction in which the heated fluid flows into the inlet side and the outlet side.

[0080] Different from the first flow path 431 that contacts the fluid to be heated and performs heat exchange, the second flow path 451 serves the following auxiliary function, that is, it only contacts the first flow path 431 and transfers heat to avoid icing.

[0081] Based on the above structure, the structure in which the main board 410, the first plate 430, and the second plate 450 are overlapped and arranged will be described. With the main board 410 as the center, the first plate 430 is arranged above and below the main board 410, and the second plate 450 is arranged outside the first plate 430.

[0082] Therefore, as Figure 5 shown, assuming the above structure as a group, each group can be arranged in a form that shares the second plate 450.

[0083] Furthermore, the second inlet sub-port 330 may be provided with an openable and closable valve 500. The valve 500 can be an automatically controlled valve or a manually controlled valve.

[0084] Whether the heated fluid flows into the second inlet sub-port 330 can be controlled with the opening and closing of the valve 500. This is to quickly supply the heated fluid through the second inlet sub-port 330 to remove the icing that may occur when the heat exchanger stops operating.

[0085] Specifically, when the valve 500 is closed, after the heated fluid moves through the first flow path 431 of the first plate 430, it is recovered through the second inlet sub-port 330 and supplied to the second plate 450. Although the icing can be removed through this recovery path, it may be difficult to quickly remove it.

[0086] When the valve 500 is open, the heating fluid flows into the first plate 430 through the first inflow sub-port 310, and further is supplied to the second plate 450 through the second inflow sub-port 330 via a direct path instead of via the recovery path, so that icing can be quickly removed.

[0087] Furthermore, an incremental sleeve 600 formed in a sealed box shape is also provided at the upper and lower parts of the housing 100, and can be formed in communication with the second inflow sub-port 330 and the discharge sub-port 350.

[0088] As described above, the discharge sub-port 350 can be arranged on the same line as the first inflow sub-port 310. Since the first inflow sub-port 310 and the second inflow sub-port 330 are isolated, the passageways through which the incremental sleeve 600 communicates with the second inflow sub-port 330 and the discharge sub-port 350 can be arranged in an isolated form rather than on the same line.

[0089] Due to this configuration, the incremental sleeve 600 can be formed with a partition wall 610 inside to form a zigzag movement path so that the heating fluid inside the incremental sleeve 600 can move easily.

[0090] In order to fully accommodate the low temperature of the heated fluid, the incremental sleeve 600 can function to sufficiently maintain the holding amount of the heating fluid to increase the total heat capacity of the heating fluid.

[0091] Looking at the overall structure, elements can be provided on all surfaces of the housing 100. The incremental sleeve 600 can be provided on the upper and lower surfaces, the sub-ports 300 can be provided on two side surfaces, and the main ports 200 can be provided on the remaining two surfaces.

[0092] Next, the heat exchange method of the heat exchanger will be described based on the above elements.

[0093] The heated fluid flows into the housing 100 through the two main ports 200 provided on the side surfaces, and after passing through the main flow path 411 formed in a straight line in the same direction as the main ports 200, it is discharged, and can flow in and out evenly by means of the main head 210.

[0094] The sub-ports 300 are formed in a direction perpendicular to the main ports 200. Hereinafter, the cases where the valve 500 is closed and open will be described.

[0095] When the valve 500 is closed, the heating fluid flowing into through the first inflow sub-port 310 flows into the first plate 430 and moves along the first flow path 431 formed in a zigzag shape to exchange heat with the heated fluid passing through the main flow path 411.

[0096] The heating fluid that has passed through the first flow path 431 enters the second plate 450 formed outside the first plate 430 through the second inflow sub-port 330, more specifically, through the second inflow sub-header 331, moves along the second flow path 451 formed perpendicular to the inflow direction, and further supplies heat to the first plate 430 to prevent icing that may occur on the first flow path 431, and is then discharged through the discharge sub-port 350.

[0097] When the valve 500 is open, the heating fluid enters simultaneously through the first inflow sub-port 310 and the second inflow sub-port 330. Different from the case when the valve 500 is closed, the heating fluid flowing into the second plate 450 does not exchange heat with the fluid to be heated and remains at a relatively high temperature, so that the icing formed in the channel unit 400 can be quickly removed.

[0098] Furthermore, in the normal operating state of the heat exchanger, icing can be prevented with the valve 500 in the closed state. However, when icing occurs in the channel unit 400 due to sudden shutdown or stoppage of operation, the valve 500 is temporarily opened to remove the icing and then re-closed, so that the normal operating state of the heat exchanger can be maintained.

[0099] On the other hand, according to another preferred embodiment of the present invention, the second inflow sub-port 330 and the valve 500 can be omitted.

[0100] That is, compared with one embodiment of the present invention described above, only the second inflow sub-port 330 and the valve 500 elements are omitted, and the other elements are all the same. This can be explained as follows, which has the same effect as the case when the valve 500 provided at the second inflow sub-port 330 is closed as described above.

[0101] The following combines the perspective view of the printed circuit board type heat exchanger that can easily prevent and remove icing showing another preferred embodiment of the present invention and the previous Figures 2 to 5 detailed description.

[0102] The present invention includes a housing 100, a main port 200 through which the fluid to be heated flows in and out, a sub-port 300 through which the heating fluid flows in and out, and a substrate laminated channel unit 400 disposed inside the housing and having flow paths formed therein. Here, the sub-port 300 includes a first inflow sub-port 310 formed on one side of the housing 100 and a discharge sub-port 350 formed on the other side of the housing 100 and formed opposite to the first inflow sub-port.

[0103] Here, the channel unit 400 includes: a main board 410 formed with a main flow path 411 that communicates with the main port 200 to allow the heated fluid to pass through; a first board 430 that is overlapped and arranged above and below the main board and is formed with a first flow path 431 described below for the heating fluid to pass through. The inlet side of the first flow path 431 communicates with a first inlet sub-header 311 formed in the first inlet sub-port 310, and the outlet side communicates with a second inlet sub-header 331 formed separately from the first inlet sub-header 311; and a second board 450 that is overlapped and arranged outside the first board 430 and is formed with a second flow path 451 whose inlet side communicates with the second inlet sub-header 331 and whose outlet side communicates with the discharge sub-port 350.

[0104] In the foregoing case, the heating fluid flows into the first board 430 through the first inlet sub-port 310 and the first inlet sub-header 311, and then moves along the first flow path 431 formed in a zigzag shape to exchange heat with the heated fluid passing through the main flow path 411.

[0105] Moreover, the heating fluid that has passed through the first flow path 431 of the first board 430 flows into the second board 450 formed outside the first board 430 through the second inlet sub-header 331, moves along the second flow path 451 formed perpendicular to the inflow direction, and further supplies heat to the first board 430 to prevent icing that may occur on the first flow path 431, and then is discharged through the discharge sub-port 350.

[0106] On the other hand, an increment sleeve 600 that communicates with the second inlet sub-header 331 and the discharge sub-port 350 may be further provided at the upper and lower parts of the casing 100. The detailed description of the increment sleeve 600 is the same as that in the foregoing text.

[0107] The embodiments described above are only illustrative, and those with ordinary knowledge in the field to which the present invention pertains can implement various other modified embodiments based on this.

[0108] Therefore, the true technical protection scope of the present invention should include the embodiments and various other modified embodiments in accordance with the technical spirit recorded in the claims.

Claims

1. A printed circuit board type heat exchanger that is easy to prevent and remove icing, characterized in that, The printed circuit board type heat exchanger includes a casing, a main port for allowing a fluid to be heated to flow in and out, a secondary port for allowing a heating fluid to flow in and out, and a substrate stacked channel unit disposed inside the casing and having a flow path formed therein. The secondary port includes: An inflow secondary port formed on one side of the casing and divided into a first inflow secondary port and a second inflow secondary port; and An exhaust secondary port formed on the other side of the casing and formed opposite to the first inflow secondary port. The channel unit includes: A main board having a main flow path formed therein for communicating with the main port and allowing the fluid to be heated to pass through; A first board stacked above and below the main board and having a first flow path formed therein with an inlet side communicating with the first inflow secondary port and an outlet side communicating with the second inflow secondary port and allowing the heating fluid to pass through; and A second board stacked outside the first board and having a second flow path formed therein with an inlet side communicating with the second inflow secondary port and an outlet side communicating with the exhaust secondary port.

2. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to claim 1, characterized in that, The second inflow secondary port is further provided with an openable and closable valve.

3. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to claim 1, characterized in that, Increment sleeves are further provided at the upper and lower parts of the casing, and the increment sleeves communicate with the second inflow secondary port and the exhaust secondary port.

4. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to any one of claims 1 to 3, characterized in that, The first flow path is formed in a zigzag shape.

5. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to any one of claims 1 to 3, characterized in that, The second flow path is formed in a straight line shape.

6. A printed circuit board type heat exchanger that is easy to prevent and remove icing, characterized in that, The printed circuit board type heat exchanger includes a casing, a main port for allowing a fluid to be heated to flow in and out, a secondary port for allowing a heating fluid to flow in and out, and a substrate stacked channel unit disposed inside the casing and having a flow path formed therein. The secondary port includes: A first inflow secondary port formed on one side of the casing; and An exhaust secondary port formed on the other side of the casing and formed opposite to the first inflow secondary port. The channel unit includes: A main board having a main flow path formed therein for communicating with the main port and allowing the fluid to be heated to pass through; A first board stacked above and below the main board and having a first flow path formed therein with an inlet side communicating with a first inflow secondary head provided at the first inflow secondary port and an outlet side communicating with a second inflow secondary head formed differently from the first inflow secondary head and allowing the heating fluid to pass through; and A second board stacked outside the first board and having a second flow path formed therein with an inlet side communicating with the second inflow secondary head and an outlet side communicating with the exhaust secondary port.

7. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to claim 6, characterized in that, Increment sleeves are also provided at the upper and lower parts of the casing, and the increment sleeves are communicated with the second inflow sub-head and the discharge sub-port.

8. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to any one of claims 6 to 7, characterized in that The first flow path is formed in a zigzag shape.

9. The printed circuit board type heat exchanger that is easy to prevent and remove icing according to any one of claims 6 to 7, characterized in that The second flow path is formed in a straight line shape.

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