KR200253172Y1 - heat transmitter - Google Patents

Abstract

The present invention relates to a heat exchanger, the interior of the housing 10 is partitioned into a plurality of chambers (C1, C2, C3, C4) by the diaphragm (20, 21, 22), the cooling water pipes through the plurality of chambers 40 is installed. In the plurality of chambers, first, second, third and fourth vortex diaphragms V1 and V3 and V4 are respectively provided. The spiral plate (V1, not shown, V3, V4) serves to guide the fluid flowing in the chamber to follow the cooling water pipe 40 passing through each chamber in turn. According to such a configuration, the fluid is in contact with the coolant pipe 40 in the chamber, and the heat exchanger can exchange heat with the coolant, thereby improving the heat exchange performance of the heat exchanger.

Description

heat transmitter

The present invention relates to a heat exchanger, and more particularly to a heat exchanger to perform heat exchange between two fluids having different temperatures.

1 shows a heat exchanger according to the prior art. As shown in the drawing, covers 3 and 4 are provided at both ends of the housing 1 to shield the inside of the housing 1 from the outside. A fluid inlet 1i penetrates through the housing 1 and communicates with the inside of one end of the housing 1, and a fluid outlet 1e is provided outside the other end. In addition, end plates 8 and 9 which divide the inside of the housing 1 and the inside of the covers 3 and 4 are provided at both ends of the housing 1, respectively.

In addition, a cooling water inlet 3i through which cooling water flows is formed at one side of the cover 3, and a cooling water outlet 3e through which the cooling water circulated inside the heat exchanger is formed at the other side of the cover 3. It is. In this case, the inner space of the cover 3 is formed separately from the space communicating with the cooling inlet 3i and the space communicating with the cooling outlet 3e.

On the other hand, a plurality of cooling water pipes 10 for passing the cooling water introduced through the cooling water inlet 3i of the cover 3 into the housing 1 are provided. The coolant pipe 10 passes through the end plates 8 and 9 to communicate the space formed by the covers 3 and 4 with the end plates 10. In addition, the inside of the housing 1 passes through the first, second, third and fourth chambers C1, C2, C3, and C4 through the first, second and third plates 5, 6 and 7, which will be described below. Done.

On the other hand, the inside of the housing 1 is partitioned by first, second and third diaphragms 5, 6 and 7. First, the diaphragms 5, 6 and 7 are sequentially installed at predetermined intervals from the cover 3 side to the cover 4 side to guide the movement of the fluid inside the heat cooker. As the diaphragms 5, 6, and 7 are installed as described above, first, second, third, and fourth chambers C1, C2, C3, and C4 are formed in the housing 1.

Here, the configuration for fluid movement between the chambers C1, C2, C3, and C4 will be described. A through hole 5 'is formed in the center of the diaphragm 5 between the first chamber C1 and the second chamber C2. Therefore, fluid movement from the first chamber C1 to the second chamber C2 is made through the through hole 5 '.

In addition, fluid movement from the second chamber C2 to the third chamber C3 is performed through a gap between the edge of the second plate 6 and the inner surface of the housing 1. That is, the diameter of the second plate 6 is smaller than the inner diameter of the housing 1 so that the fluid can be moved through the gap. On the other hand, the fluid movement from the third chamber (C3) to the fourth chamber (C4) is made through the through hole (7 ') formed in the center of the third plate (7).

In the heat exchanger according to the prior art having the configuration as described above it will be described that the heat exchange between the cooling water and the fluid.

First, the coolant is introduced into the space inside the cover 3 through the coolant inlet 3i and enters the coolant pipe 10. At this time, the cooling pipe 10 through which the coolant introduced through the cooling inlet 3i is in communication with the cooling inlet 3i and corresponds to half of the whole.

In addition, the remaining cooling pipe 10 flows into the space inside the cover 4 opposite to the housing 1 and then exits the cooling water outlet 3e. That is, the coolant flowing through the inside of the housing 1 through the half of the cooling pipe 10 and flowed into the space inside the cover 4 is reversed inside the housing 1 through the other half of the cooling pipe 10. It penetrates into the space inside the cover 3 which is in communication with the cooling outlet 3e, and is discharged to the outside of the heat exchanger through the cooling outlet 3e in the space.

On the other hand, a relatively hot fluid, that is, a fluid to which heat is to be discharged, flows into the first chamber C1 through the fluid inlet 1i, and in turn, the second, third, fourth chambers C2, C3, C4. It is discharged to the outside through the fluid outlet (1e) in communication with the fourth chamber (C4) via.

At this time, it will be described in detail that the heat exchange is performed while the fluid flows between the chamber (C1, C2, C3, C4). Once the fluid introduced into the first chamber (C1) through the fluid inlet (1i) is in contact with the outer surface of the coolant pipe 10 passing through the first chamber (C1) flows to exchange heat.

The fluid flows from the first chamber C1 to the second chamber C2. At this time, it is moved through the through hole (5 ') formed in the center of the first plate (5). As such, the fluid moved to the second chamber C2 flows while contacting the outer surface of the coolant pipe 10 again to exchange heat with the coolant. Then, it is moved to the third chamber C3. The movement from the second chamber C2 to the third chamber C3 is made through a gap between the edge of the second partition 6 and the inner wall of the housing 1.

The fluid moved to the third chamber C3 is in contact with the outer surface of the cooling water pipe 10 passing through the third chamber C3 to exchange heat with the cooling water. Then, the third plate 7 is moved to the fourth chamber C4 through the through hole 7 ', and the fourth chamber C4 is also in contact with the outer surface of the coolant pipe 10 to exchange heat with the coolant. . In this way, the fluid that has completed the heat exchange in the fourth chamber C4 is discharged to the outside of the heat exchanger through the fluid outlet 1e.

However, the conventional heat exchanger having the structure as described above has the following problems. That is, although the plurality of coolant pipes 10 are densely installed in the inner space of the housing 1, the fluid is actually exchanged with the entire coolant pipe 10 while the fluid passes through the chambers C1, C2, C3, C4. Will not.

For example, the fluid flowing into the first chamber C1 through the fluid inlet 1i is mainly the coolant located between the through holes 5 'of the first plate 5 at the fluid inlet 11. The heat exchange is performed only in contact with the pipe 10.

In the second chamber C2, the fluid flows from the through hole 5 ′ toward the gap formed between the edge of the second plate 6 and the inner surface of the housing 1. Heat exchange with At this time, since the fluid does not contact the surfaces of all the coolant pipes 10 in the second chamber C2, efficient heat exchange does not occur.

As described above, in the conventional heat exchanger, there is a problem in that heat exchange between the fluid and the cooling water is not performed efficiently. To overcome this, another method such as designing a larger heat exchanger must be used.

An object of the present invention to solve the problems of the prior art as described above is to provide a heat exchanger configured to more effectively perform the heat exchange between the fluid and the cooling water.

1 is a schematic perspective view showing the internal configuration of a heat exchanger according to the prior art.

Figure 2 is a cross-sectional view showing the configuration of an embodiment of a heat exchanger according to the present invention.

3 is a cross-sectional view along the line AA ′ of FIG. 2.

B-B 'sectional drawing of FIG. 2 FIG.

5 is a cross-sectional view taken along the line C-C 'of FIG.

Figure 6 is a perspective view showing the configuration of a spiral plate constituting an embodiment of a heat exchanger according to the present invention.

7 is a cross-sectional view corresponding to FIG. 3 of one embodiment as a configuration of another embodiment of the present invention.

8 is a cross-sectional view corresponding to FIG. 4 as a constitution of another embodiment of the present invention.

9 is a cross-sectional view corresponding to FIG. 5 as a constitution of another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: housing 20, 21, 22 ': first, second, third diaphragm

20 ', 22': Through 21 '. Communication

25, 26: seat plate 30: end cover

31: cooling water inlet 32: inlet space

33: cooling water outlet 34: outlet space

40: coolant pipe 51: fluid inlet

52: fluid outlet V1, V3, Y4: spiral diaphragm

According to a feature of the present invention for achieving the object of the present invention as described above, the present invention is a heat exchange chamber is formed by the partition wall, the communication hole communicating the heat exchange chamber is formed alternately at the center and the edge in the adjacent partition wall And a first fluid flow path in which a plurality of housings are installed to penetrate the heat exchange chamber and the partition wall in the housing, and a part of the first fluid flows from one heat exchange chamber to the other heat exchange chamber and the other flows in the opposite direction. The second fluid flows in a spiral line in the heat exchange chamber along the first fluid flow paths so as to exchange heat with the first fluid while passing in contact with each of the first fluid flow paths. And a second fluid flow path formed by the spiral plate.

The first fluid flow path is formed between the spiral spiral plates which are installed in the heat exchange chamber in a spiral shape to form a second fluid flow path.

A plurality of turbulent protrusions are formed in the spiral plate forming the second fluid passage to form turbulence in the flow of the second fluid.

The first fluid passage penetrates through the central side of the housing to be an inflow passage, and the outer circumferential side penetrates into an outlet passage. The space provided on one side of the housing for fluid introduction and withdrawal into the first fluid passage is provided. The inflow space communicating with the inflow passage is formed to surround the outflow space in communication with the outflow passage.

According to the heat exchanger according to the present invention having such a configuration there is an advantage that the heat exchange is efficient because the contact between the two fluids for heat exchange is generated in more parts.

Hereinafter, embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

First, an embodiment of the present invention will be described with reference to FIGS. 2 to 5.

The chamber 10 of the heat exchanger is provided with a plurality of chambers C1, C2, C3, C4. The chambers C1, C2, C3 and C4 are partitioned into first, second and third partitions 20, 21 and 22, respectively. In addition, seat plates 25 and 26 are installed at portions corresponding to both ends of the housing 10 so that the chambers C1 and C4 are formed inside the housing 10.

End covers 30 and 35 are mounted at both sides of the housing 10, respectively. One side end cover 30 is formed with a cooling water inlet 31 and a cooling water outlet 33, respectively. In addition, the inside of one end cover 30 is separated into an inflow space 32 in communication with the cooling inlet 31 and an outlet space 34 in communication with the cooling export port 33. Here, the inflow space 32 is formed toward the inner edge of the end cover 30 so as to surround the outflow space 34. Here, between the end covers 30 and 35 and both ends of the housing 10 is partitioned by seat plates 25 and 26.

On the other hand, the end cover 35 has a communication space 36 therein. The communication space 36 serves to allow the coolant flowing from the outside of the coolant pipe 40 to be described below to be transferred to the cooling pipe 40 at the center. To this end, the cooling water guide plate 37 is installed in the communication space 36. Reference numeral 38 is a buzzer, and 39, 39 'is a sheet plate.

The diaphragm 20, 21, 22 and the inside of the housing 10 communicate the spaces 32, 34 of one end cover 30 and the communication space 36 inside the other end cover 35 with each other. A plurality of coolant pipes 40 formed in a straight line through the seat plates 25 and 26 are installed.

Here, the configurations of the diaphragms 20, 21, 22 and the seat plates 25, 26 forming the chambers C1, C2, C3, C4 in the housing 10 are as follows.

First, as shown in FIG. 3, the first plate 20 has a through hole 20 ′ formed in the center thereof to communicate the first chamber C1 and the second chamber C2. The cooling water pipe 40 is penetrated through the first partition plate 20.

As shown in FIG. 4, the second plate 21 is installed inside the housing 10 to partition the second chamber C2 and the third chamber C3. The cooling water pipe 4D penetrates through the second partition plate 21. In addition, a communication port 21 'is formed at one side of the second plate 21. The communication hole 21' has one side edge portion of the second plate 21 being cut off so that the housing 10 is formed. It is formed between the inner surface of the second chamber (C2) and to communicate between the third chamber (C3).

5 shows that the third plate 22 is installed. The third plate 22 has a through hole 22 ′ formed at the center thereof to allow the third chamber C3 and the fourth chamber C4 to communicate with each other. In addition, the coolant pipe 40 also penetrates through the third partition 22.

Meanwhile, the strip plate 25 partitions the spaces 32 and 34 of the first chamber C1 and the end cover 30, and the coolant pipe 40 penetrates the space of the housing 910. The same diameter as the inner diameter prevents leakage between the first chamber C1 and the spaces 32 and 34 in the end cover 30.

The strip plate 26 partitions between the fourth chamber C4 and the communication space 36 inside the end cover 35. The coolant pipe 40 penetrates the housing plate. It has the same diameter as the inner diameter of 10 to prevent the leakage between the fourth chamber (C4) and the communication space 36 inside the end cover (35).

On the other hand, inside the first, second, third, and fourth chambers C1, C2, C3, and C4 are provided spiral spiral plates V1 and V3 and V4, respectively. The spiral plate V1 (not shown, V3, V4) forms a passage of the fluid flowing therein in the chambers C1, C2, C3, C4. In this case, as shown in FIGS. 3 to 5, the spiral plate partitions the cooling water pipe 40 penetrating spirally in the chambers C1, C2, C3, and C4. The fluid flowing inside the chambers C1, C2, C3, C4 is guided from the outside of the chambers C1, C2, C3, C4 to the inside or from the inside to the outside. Such spiral plates V1, V3, and V4 are respectively disposed on the partition walls 20, 21, 22 and the seat plates 25 and 26, which define respective chambers C1, C2, C3, and C4. It is provided in each chamber C1, C2, C3, C4 so that the both ends may contact.

Therefore, the fluid in each chamber (C1, C2, C3, C4) is guided by the spiral plate (V1, not shown, V3, V4) is to flow through the respective cooling water pipe 40 in turn.

On the other hand, the fluid inlet 51 is formed in communication with the first chamber (C1) on one side of the housing 10, that is, the portion corresponding to the first chamber (C1). The fluid inlet 51 is a portion into which the fluid to exchange heat with the cooling water flows into the heat exchanger. The fluid outlet 52 is formed on the other side of the housing 10, that is, the portion corresponding to the fourth chamber C4, so as to communicate with the fourth chamber C4. The fluid outlet 52 is a portion in which the fluid which has completed heat exchange with the cooling water is discharged to the outside of the heat exchanger.

In addition, the coolant pipe 40 is in the flow path of the fluid formed by the spiral plate (V1, not shown, V3, V4) as shown in FIG. 3, 4 and 5 It is alternately installed. In other words, when viewed in the flow direction of the fluid, the cooling water pipes 40, which are provided in sequence, are slightly biased to one right side and one to the left side. As the cooling water pipes 40 are alternately arranged in this manner, the fluid comes into contact with the cooling water pipe 40 in more portions, which is advantageous for heat exchange.

In the embodiment of the present invention having such a configuration will be described in detail made of a heat exchanger. In the heat exchanger according to the present invention is a heat exchange between the cooling water and the fluid. At this time, the cooling water flows along the cooling water pipe 40, and the fluids flow along the interior of the chambers C1, C2, C3, and C4 to exchange heat with each other.

Here, it will first be described that the cooling water moves inside the heat exchanger. Cooling water is moved to the inlet space 32 inside the end cover 30 through the cooling water inlet 31. Then, it moves along the cooling water pipe 40 in communication with the inflow space (32). At this time, the coolant pipes 40 communicating with the inflow space 32 are the ones on the outside among those shown in FIGS. 3 to 5. That is, the cooling water pipe 40 penetrates to a portion corresponding to the outside of the cooling water induction plate 37 in the end cover 35.

Then, it passes completely through the interior of the housing 10 to the communication space 36 inside the other end cover 35. Here, the coolant is guided to the center side of the communication space 36 by the coolant guide plate 37 to move back into the cooling water pipe 40 communicating with the communication space 36. At this time, the coolant pipe 40 communicating with the communication space 36 is mainly installed through the center side of the diaphragm 20, 21, 22, and is formed in the end cover 30. It is in communication with the outlet space (34).

Therefore, the coolant flowing from the inflow space 32 to the communication space 36 and the coolant flowing from the communication space 36 to the outlet space 34 are moved in opposite directions. The coolant flowing into the outlet space 34 exits to the outside of the heat exchanger through the cooling outlet 33.

Then, the fluid flows into the first chamber C1 through the fluid inlet 51. The fluid introduced into the first chamber C1 gradually contacts the cooling water pipe 40 from the outside of the first chamber C1 in turn, as shown by the arrows in FIG. 3, and then gradually into the inside of the first chamber C1. Will move. At this time, the coolant pipe 40 is alternately slightly shifted with respect to the flow direction of the fluid so that the fluid flowing in the first chamber C1 is in contact with the coolant pipe 40 in more portions.

As described above, the fluid flowing to the center of the first chamber C1 is moved to the second chamber C2 through the through hole 20 'formed in the first partition wall 20. The fluid moved to the second chamber C2 is then moved from the center side of the second chamber C2 to the outside. That is, the fluid moved to the center side of the second chamber C2 through the through hole 20 '. Is moved to the outside of the second chamber (C2) by the guide of the spiral plate (not shown). Here, too, the fluid moves in contact with the cooling water pipe 40 in sequence. In particular, the cooling water pipes 40 are alternately installed so that the heat exchange area becomes wider. Thus, the fluid moved to the outside of the second chamber (C2), as shown in Figure 4, through the communication port 21 'formed on one side of the second plate 21, the third chamber ( Is moved to C3).

As described above, the fluid moved to the third chamber C3 through the communication port 21 'is moved toward the central side from the outside of the third chamber C3 as in the first chamber C1. It is guided and moved by V3. In this process, the fluid is also in contact with the coolant pipe 40 to heat exchange. Then, the fluid moved to the center side of the third chamber (C3) is moved to the fourth chamber (C4) through the through hole 22 'of the third plate 22, as shown in FIG.

Then, the fluid moved to the fourth chamber (C4) is guided along the helical partition (V4) as shown by the arrow in Figure 5 is moved to the outside of the fourth chamber (C4) to exchange heat with the cooling water. In this way, the fluid moved to the outside of the fourth chamber (C4) is moved to the outside of the heat exchanger through the fluid outlet (52).

On the other hand, Figure 7 to Figure 9 shows another embodiment of the present invention. As shown therein, another embodiment of the present invention has the same configuration and the respective chambers C1, C2, C3, C4 partitioned by diaphragms 80, 81, 82 in the interior of the housing 10. The configuration for the movement of the fluid and the coolant in the vessel is different.

However, the coolant flows from one side of the inner side of the housing 10 to the other side, and the flow of the fluid in contact with the coolant flow path through which the coolant flows is formed similarly to the embodiment. Therefore, the same configuration as the above embodiment will be described using the same reference numerals.

That is, each of the chambers C1, C2, C3, and C4 divided by diaphragms 80, 81, and 82 has first, second, third, and fourth double spiral plates V6, not shown, and V8 and V9. Each is installed. Such a double spiral plate V6 (not shown, V8, V9) is provided to reach from one end to the other end of the chamber (C1, C2, C3, C4). Such a double spiral plate V6, not shown, V8, V9 is to guide the flow of fluid in each chamber (C1, C2, C3, C4).

In addition, a cooling water duct 45 for flowing the cooling water is provided on the inner side (between the double plates) of the double spiral plate V6 (not shown). At this time, the double spiral diaphragm (V6, not shown, V8, V9) forms one side wall of the cooling water duct (45).

In addition, a turbulent flow forming protrusion 80 is formed on an inner wall of the double spiral diaphragm V6 (not shown, V8, V9) or the housing 10, that is, a passage through which fluid flows.

In addition, the structure of the 1st, 2nd, 3rd partition plates 70, 71, 72 which partitions said 1.2, 3, 4 chambers C1, C2, C3, C4 is demonstrated easily. First, as shown in FIG. 7, the first plate 70 partitioning the first chamber C1 and the second chamber C2 has a through hole 70 ′ formed at the center thereof. The fluid flows from the first chamber C1 to the second chamber C2 through the through hole 70 '.

As shown in FIG. 8, the second plate 71 partitioning the second chamber C2 and the third chamber C3 has a communication port 71 'formed at one end thereof. In such a communication port 71 ', the fluid flowing in the second chamber C2 moves to the third chamber C3.

In addition, a through hole 72 'is formed in the center of the third partition 72 that partitions the third chamber C3 and the fourth chamber C4. Through the through hole 72 ', the fluid passing through the third chamber C3 moves to the fourth chamber C4.

In another embodiment of the present invention having such a configuration will be described in detail that the heat exchange is performed while the cooling water and the fluid is moved.

First, the cooling water flows along the cooling water duct 45, and the fluids flow along the interior of the chambers C1, C2, C3, and C4 to exchange heat with each other.

Here, it will first be described that the cooling water moves inside the heat exchanger. Cooling water is moved to the inlet space 32 inside the end cover 30 through the cooling water inlet 31. Then, it moves along the cooling water duct 45 in communication with the inflow space (32). At this time, the coolant pipes 45 communicated with the inflow space 32 are the ones outside the ones shown in FIGS. 7 to 9. That is, the cooling water duct 45 penetrates to a portion corresponding to the outside of the cooling water induction plate 37 in the end cover 35.

Then, it passes completely through the interior of the housing 10 to the communication space 36 inside the other end cover 35. Here, the coolant is guided to the center side of the communication space 36 by the coolant induction plate 37 and moves again to the inside of the cooling water duct 45 in communication with the communication space 36. At this time, the cooling water duct 45 communicated with the communication space 36 are mainly installed through the center side of the diaphragm 70, 71, 72 and are formed in the end cover 30. It is in communication with the outlet space (34).

Therefore, the coolant flowing from the inflow space 32 to the communication space 36 and the coolant flowing from the communication space 36 to the outlet space 34 are moved in opposite directions. The coolant flowing into the outlet space 34 exits to the outside of the heat exchanger through the cooling outlet 33.

Then, the fluid flows into the first chamber C1 through the fluid inlet 51. The fluid flowing into the first chamber C1 is in contact with the double vortex diaphragm V6 forming the outer surface of the cooling water duct 45 in order from the outside of the first chamber C1 as shown by arrows in FIG. As it gradually moves to the inside of the first chamber (C1). In this case, a turbulent protrusion 80 is formed on the inner wall of the double vortex plate V6 and the housing 10 so that the fluid flowing in the chamber C1 forms turbulent flow.

As described above, the fluid flowing to the center of the first chamber C1 moves to the second chamber C2 through the through hole 70 'formed in the first partition wall 70. The fluid moved to the second chamber C2 is then moved outward from the center side of the second chamber C2. That is, the fluid moved to the center side of the second chamber C2 through the through hole 70 'is moved to the outside of the second chamber C2 by the guidance of the double vortex plate (not shown). Here, too, the fluid moves in contact with the double vortex partition wall forming the cooling water duct 45. In particular, the flow of the fluid becomes turbulent due to the presence of the turbulence protrusion 80.

Thus, the fluid moved to the outside of the second chamber (C2) is a third through the communication port 71 'is formed on one side of the second double vortex linear plate 71, as shown in FIG. It is moved to the chamber C3.

As described above, the fluid moved to the third chamber C3 through the communication port 71 'is the double vortex diaphragm toward the center from the outside of the third chamber C3 as in the first chamber C1. It is guided and moved by V8. In this process, the fluid is also in contact with the cooling water duct 45 to perform heat exchange. Then, the fluid moved to the center side of the third chamber (C3) is moved to the fourth chamber (C4) through the through hole (72 ') of the third plate (72) as shown in FIG.

Then, the fluid moved to the fourth chamber (C4) is guided along the double helix plate (V7) as shown by the arrow in Figure 9 is moved to the outside of the fourth chamber (C4) to exchange heat with the coolant. In this way, the fluid moved to the outside of the fourth chamber (C4) is moved to the outside of the heat exchanger through the fluid outlet (52).

The heat exchanger according to the present invention as described in detail above forms a plurality of chambers therein, and a spiral plate is installed in each chamber so that fluid flows in sequence along a coolant pipe crossing the interior of the chamber. Therefore, the fluid introduced into the chamber can be guided along the helical diaphragm and in contact with the coolant pipe in more portions, thereby allowing heat exchange. Thus, the heat exchange efficiency of the heat exchanger can be expected to be greatly improved. .

Claims (3)

The heat exchange chamber is formed by the partition wall, and a plurality of communication holes for communicating the heat exchange chamber are installed in the adjacent partition wall alternately at the center and the edge, and a plurality of passages are provided to penetrate the heat exchange chamber and the partition wall inside the housing. The first fluid passage through which the first fluid flows in the opposite direction from the heat exchange chamber to the other heat exchange chamber and the first fluid passage in which the plurality of second fluids introduced into the heat exchange chamber are sequentially contacted are passed. And a second fluid flow path formed by a spiral plate installed in the heat exchange chamber in a spiral shape along the first fluid flow paths so as to exchange heat with the first fluid. The heat exchanger according to claim 1, wherein the first fluid passage is formed between the double eddy plates installed in the heat exchange chamber in a spiral shape to form a second fluid passage. The heat exchanger of claim 2, wherein a plurality of turbulent protrusions are formed in the spiral plate forming the second fluid flow path to form turbulence in the flow of the second fluid.