JP2018100790A - Heat exchanger and water heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which can inhibit occurrence of ebullition noise of hot water flowing in heat transfer pipes and inhibit resistance to flow of the hot water flowing in the heat transfer pipes, and to provide a water heating system including the heat exchanger.SOLUTION: A heat exchanger 10 includes: heat transfer pipes 13; and baffles 19. Each baffle 19 includes: a body part 19a; a first protruding part 19b; and a second protruding part 19c. The first protruding part 19b protrudes from the body part 19a into a first space IS1, and the second protruding part 19c protrudes from the body part 19a into a second space IS2. When the first protruding part 19b and the second protruding part 19c are viewed from an axial direction of the heat transfer pipe 13, a height of the first protruding part 19b protruding from the body part 19a to the first space IS1 is greater than a height of the second protruding part 19c protruding from the body part 19a to the second space IS2.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat exchanger and a hot water device, and more particularly to a heat exchanger and a hot water device provided with a baffle.

  A heat exchanger provided with a baffle is disclosed, for example, in Japanese Utility Model Publication No. 56-173882 (Patent Document 1). In the baffle described in this publication, a part of a plate-like member is cut and raised. When this baffle is disposed inside the heat transfer tube, turbulent flow is generated in the hot water flowing inside the heat transfer tube. Thereby, generation | occurrence | production of the boiling noise of hot water is suppressed.

Japanese Utility Model Publication No. 56-173882

  When the baffle described in the above publication is installed inside the heat transfer tube, there is a problem that the flow resistance of the hot water flowing inside the heat transfer tube increases.

  This invention is made | formed in view of the said subject, The objective is suppressing the flow resistance of the hot water which flows through the inside of a heat exchanger tube while suppressing generation | occurrence | production of boiling noise of the hot water flowing through the inside of a heat exchanger tube. It is providing the heat exchanger which can perform, and a hot-water apparatus provided with the same.

  The heat exchanger of the present invention includes a heat transfer tube and a baffle. The heat transfer tube is for flowing hot water into the internal space. A baffle is arrange | positioned in the internal space of a heat exchanger tube, and is for generating a turbulent flow in hot water in an internal space. The baffle includes a main body portion, a first convex portion, and a second convex portion. The main body extends in the axial direction of the heat transfer tube, and is divided into a first space and a second space in the radial direction of the heat transfer tube. The first convex portion protrudes from the main body portion into the first space. The second convex portion protrudes from the main body portion into the second space. When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is such that the second convex portion is the main body portion. Is larger than the height protruding from the second space.

  According to the heat exchanger of the present invention, the first convex portion is disposed on the upstream side of the flow of the heating gas, so that the turbulent flow of hot water is positively caused by the first convex portion on the heating side of the heat transfer tube. Is promoted. For this reason, generation | occurrence | production of the boiling noise of hot water can be suppressed. On the other hand, by disposing the second convex portion on the downstream side of the flow of the heating gas, the pressure loss of hot water is reduced by the second convex portion on the non-heating side of the heat transfer tube. For this reason, the water flow resistance can be suppressed.

  In the above heat exchanger, the baffle includes a first wall and a second wall. The first wall is connected to the first end portion of the main body portion and extends in the axial direction of the heat transfer tube. The second wall is connected to the second end portion of the main body portion and extends in the axial direction of the heat transfer tube. Each of the first convex portion and the second convex portion is disposed between the first wall and the second wall. The first wall includes a first protruding wall and a second protruding wall. The first protruding wall protrudes from the main body portion into the first space. The second protruding wall protrudes from the main body portion into the second space. The second wall includes a third protruding wall and a fourth protruding wall. The third protruding wall protrudes from the main body portion into the first space. The fourth protruding wall protrudes from the main body portion into the second space. For this reason, the first projecting wall and the second projecting wall are in contact with the heat transfer tubes in the first space and the second space at the first end of the main body, and the first space and the second space at the second end of the main body. Thus, the third protruding wall and the fourth protruding wall can contact the heat transfer tube. Thereby, when a baffle is inserted in a heat exchanger tube, it is suppressed that it rotates inside a heat exchanger tube. Therefore, it becomes easy to assemble the baffle inside the heat transfer tube.

  In the above heat exchanger, the baffle includes a first hook for fixing to the heat transfer tube. The first hook portion is provided on the first wall and the second wall, and the distance between the first wall and the second wall in the axial direction of the heat transfer tube is from the front end portion to the rear end portion of the baffle. After extending so that it may become large, it is comprised so that the space | interval of a 1st wall and a 2nd wall may become small. For this reason, a baffle can be fixed to a heat exchanger tube by the 1st hook part. In addition, the first hook portion is elastically deformed so that the distance between the first wall and the second wall becomes small when inserted into the internal space of the heat transfer tube, and is restored when moved to the outside of the internal space. Thus, it can be hooked on one end face in the axial direction of the heat transfer tube. Therefore, it is easy to fix the baffle to the heat transfer tube.

  In the above heat exchanger, the baffle includes a second hook portion for fixing to the heat transfer tube. The second hooking portion is provided on the first wall and the second wall, and extends from the rear end portion of the baffle so that the distance between the first wall and the second wall is large, and then the front end portion of the baffle. It is configured to protrude to the side. For this reason, a baffle can be fixed to a heat exchanger tube by the 2nd hook part. Moreover, since the baffle cannot be inserted into the heat transfer tube from the rear end side by the second hooking portion, the insertion direction of the baffle into the heat transfer tube can be regulated. Thereby, it can prevent that a baffle is inserted in the reverse direction.

  In the above heat exchanger, the baffle includes a second hook portion for fixing to the heat transfer tube. The second hooking portion is provided on the first wall and the second wall, and the distance between the first wall and the second wall is from the rear end portion of the baffle toward the front end portion in the axial direction of the heat transfer tube. After extending so that it may become large, it is comprised so that the space | interval of a 1st wall and a 2nd wall may become small. For this reason, a baffle can be fixed to a heat exchanger tube by the 2nd hook part. In addition, the second hooking portion is elastically deformed so that the distance between the first wall and the second wall becomes small when inserted into the internal space of the heat transfer tube, and is restored when moved to the outside of the internal space. Thus, it can be hooked on the other end surface in the axial direction of the heat transfer tube. Therefore, it is easy to fix the baffle to the heat transfer tube. Further, the baffle can be inserted into the heat transfer tube from either the front end portion or the rear end portion of the baffle.

  In the above heat exchanger, the first convex portion protrudes from the main body so as to form an obtuse angle with the main body. The second convex portion protrudes from the main body so as to form an obtuse angle with the main body. The angle formed between the first convex portion and the main body portion is smaller than the angle formed between the second convex portion and the main body portion. The shape of the first convex portion when the first convex portion is viewed from the direction orthogonal to the angle formed by the first convex portion and the main body portion is orthogonal to the angle formed by the second convex portion and the main body portion. It is equal to the shape of the 2nd convex part when the 2nd convex part is seen from the direction to do. For this reason, a 1st convex part and a 2nd convex part can be provided by bending the 1st convex part and 2nd convex part of the same shape so that an obtuse angle may be made with a main-body part. For this reason, since it becomes possible to produce a 1st convex part and a 2nd convex part with the same metal mold | die, productivity can be improved.

  In the above heat exchanger, when the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is the heat transfer tube. The height at which the second convex portion protrudes from the main body portion into the second space is smaller than the radius of the inner diameter of the heat transfer tube. Therefore, by arranging the first convex portion on the upstream side of the flow of the heating gas, the turbulent flow of hot water is effectively promoted by the first convex portion on the heating side of the heat transfer tube. On the other hand, by disposing the second convex portion on the downstream side of the flow of the heating gas, the pressure loss of the hot water is effectively reduced by the second convex portion on the non-heating side of the heat transfer tube.

  In the above heat exchanger, the cross section of the internal space of the heat transfer tube in the radial direction of the heat transfer tube is elliptical. When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is the radius of the long axis of the elliptical cross section. The height at which the second convex portion protrudes from the main body portion into the second space is smaller than the radius of the major axis of the elliptical cross section. Therefore, by arranging the first convex portion on the upstream side of the flow of the gas for heating, the turbulent flow of hot water is effectively promoted on the elliptical long axis by the first convex portion on the heating side of the heat transfer tube. Is done. On the other hand, by arranging the second convex portion on the downstream side of the flow of the heating gas, the pressure loss of hot water is effectively reduced on the long axis of the ellipse by the second convex portion on the non-heating side of the heat transfer tube. Reduced.

  In the above heat exchanger, when the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the projected area of the first convex portion is larger than the projected area of the second convex portion. large. Therefore, by arranging the first convex portion on the upstream side of the flow of the heating gas, the turbulent flow of hot water is effectively promoted by the first convex portion on the heating side of the heat transfer tube. On the other hand, by disposing the second convex portion on the downstream side of the flow of the heating gas, the pressure loss of the hot water is effectively reduced by the second convex portion on the non-heating side of the heat transfer tube.

  The hot water device of the present invention includes the above heat exchanger and a burner for generating a heating gas supplied to the heat exchanger. According to the hot water device of the present invention, hot water provided with a heat exchanger that can suppress the occurrence of boiling noise of hot water flowing inside the heat transfer tube and can suppress the flow resistance of hot water flowing inside the heat transfer tube. An apparatus can be provided.

  As described above, according to the present invention, a heat exchanger capable of suppressing the generation of boiling noise of hot water flowing inside the heat transfer tube and suppressing the flow resistance of the hot water flowing inside the heat transfer tube and the heat exchanger Can be provided.

It is a figure which shows typically the structure of the hot water apparatus in one embodiment of this invention. It is a perspective view showing roughly composition of a sensible heat recovery heat exchanger and a latent heat recovery heat exchanger in one embodiment of the present invention. It is a perspective view which shows roughly the structure of the sensible heat recovery heat exchanger in one embodiment of this invention. It is sectional drawing which shows roughly the structure of the sensible heat recovery heat exchanger in one embodiment of this invention. It is sectional drawing which shows the state in which the baffle was attached to the edge part of the heat exchanger tube in one embodiment of this invention. It is sectional drawing which shows the state in which the baffle was attached to the heat exchanger tube in one embodiment of this invention. It is a perspective view which shows roughly the structure of the baffle in one embodiment of this invention. It is a side view which shows roughly the structure of the baffle in one embodiment of this invention. It is a front view which shows roughly the structure of the baffle in one embodiment of this invention. It is sectional drawing which shows roughly the flow of the hot water inside the heat exchanger tube in one embodiment of this invention. It is a side view which shows roughly the structure of the 1st modification of a baffle. It is sectional drawing which shows schematically the structure of the 2nd modification of a baffle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the structure of the hot water apparatus in one embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the hot water device 100 of the present embodiment includes a sensible heat recovery heat exchanger (primary heat exchanger) 10, a spark plug 14, and a latent heat recovery heat exchanger (secondary heat exchanger). 20, burner 30, chamber 31, blower 32, duct 33, venturi 34, orifice 35, gas valve 36, pipe 40, bypass pipe 41, three-way valve 42, and liquid-liquid heat exchanger 43 The hot water pipe 44 and the housing 50 are mainly provided. Inside the housing 50, all of the above components except the housing 50 are arranged. The above components are the same as those conventionally known except for the sensible heat recovery heat exchanger (primary heat exchanger) 10.

  The fuel gas flows to the venturi 34 through the gas valve 36 and the orifice 35. The mixed gas mixed in the venturi 34 is sent to the blower 32. The blower 32 is for supplying the mixed gas to the burner 30.

  The blower 32 is connected to the chamber 31, and the chamber 31 is connected to the burner 30. The mixed gas supplied from the blower 32 is sent to the burner 30 through the chamber 31.

  The burner 30 is for generating a heating gas supplied to the sensible heat recovery heat exchanger (heat exchanger) 10. The mixed gas blown out from the burner 30 is ignited by the spark plug 14 and becomes combustion gas.

  The burner 30, the sensible heat recovery heat exchanger 10, and the latent heat recovery heat exchanger 20 are connected so that the combustion gas sequentially passes through the sensible heat recovery heat exchanger 10 and the latent heat recovery heat exchanger 20 to exchange heat with hot water. ing. A duct 33 is connected to the latent heat recovery heat exchanger 20, and the duct 33 extends to the outside of the housing 50. As a result, the combustion gas that has passed through the latent heat recovery heat exchanger 20 is discharged to the outside of the housing 50 through the duct 33.

  A portion of the piping 40 on the outlet side of the sensible heat recovery heat exchanger 10 and the bypass piping 41 are connected by a three-way valve 42. A liquid-liquid heat exchanger 43 is connected to the bypass pipe 41. When hot water flowing inside the liquid-liquid heat exchanger 43 flows outside the hot water pipe 44, heat exchange is performed between the hot water flowing inside the liquid-liquid heat exchanger 43 and the hot water flowing inside the hot water pipe 44. It becomes possible.

  Next, the configuration of the sensible heat recovery heat exchanger (heat exchanger) 10 used in the hot water device 100 will be described with reference to FIGS.

  As shown in FIG. 2, the sensible heat recovery heat exchanger 10 of the present embodiment includes a case 11, a header 12, a heat transfer pipe (heat absorption pipe: FIGS. 3 and 4) 13, and fins 16 (FIG. 4). ), A pressing member 17, a fixing member 18, and a baffle 19 (FIG. 4).

  The case 11 has a first side wall 11a, a second side wall 11b, a third side wall 11c, and a fourth side wall 11d. The first side wall 11a to the fourth side wall 11d are connected to form a square frame shape.

  The case 11 having the frame shape has openings in the upper and lower sides. Accordingly, the combustion gas can be supplied into the case 11 through the opening on the upper side of the case 11. Further, the combustion gas can be exhausted to the outside of the case 11 through the lower opening of the case 11.

  A header 12 is provided on the outer surface of the first side wall 11a. The header 12 provided on the outer surface of the first side wall 11a is provided with a joint 13a on the incoming side and a joint 13b on the outgoing side. A header 12 (not shown) is also provided on the outer surface of the third side wall 11c.

  As shown in FIG. 3, the header 12 provided on the outer surface of the first side wall 11 a and the header 12 provided on the outer surface of the third side wall 11 c are connected by a plurality of heat transfer tubes 13. The plurality of heat transfer tubes 13 include a heat transfer tube 13 positioned inside the case 11 and a heat transfer tube 13 positioned outside the case 11.

  As shown in FIG. 4, the heat transfer tube 13 is for flowing hot water into the internal space IS. In the present embodiment, the heat transfer tube 13 is an elliptic tube. That is, the cross section of the internal space IS in the radial direction of the heat transfer tube 13 is elliptical.

  A baffle 19 is disposed in the internal space IS of the heat transfer tube 13. The baffle 19 is for generating turbulent flow in the hot water in the internal space IS of the heat transfer tube 13. In the present embodiment, each of the plurality of baffles 19 is arranged in the internal space IS of each of the plurality of heat transfer tubes 13 located inside the case 11.

The flow of hot water flowing through the header 12 and the heat transfer tube 13 is, for example, as follows.
Hot water that has entered from the joint 13a on the water inlet side enters the heat transfer tube 13 located inside the case 11 through the header 12 provided on the outermost surface of the first side wall 11a. The hot water entering the heat transfer tube 13 reaches the header 12 (not shown) provided on the outer surface of the third side wall 11c. The hot water that has reached the header 12 provided on the outer surface of the third side wall 11 c passes through another heat transfer tube 13 connected to the header 12 and reaches the header 12 provided on the outer surface of the first side wall 11 a.

  In this way, the hot water is turned from the first side wall 11a side to the third side wall 11c side and then folded back from the third side wall 11c side to the first side wall 11a side. Thereafter, the hot water flows so that the folding back toward the third side wall 11c and the folding back toward the first side wall 11a are repeated.

  As shown in FIG. 2, the hot water that has reached the header 12 provided on the outermost side of the outer surface of the first side wall 11a as described above passes through the heat transfer tube 13 provided on the outer surface of the second side wall 11b. The header 12 provided on the outer surface of the three side walls 11c is reached.

  As shown in FIG. 3, the hot water that has reached the header 12 provided on the outer surface of the third side wall 11c is provided on the outer surface of the first side wall 11a through the heat transfer tube 13 provided on the outer surface of the fourth side wall 11d. Finally, the hot water is discharged from the hot water side joint 13b.

  As shown in FIG. 4, a plurality of fins 16 are connected to the outer peripheral surface of the heat transfer tube 13 located inside the case 11. In FIG. 3, the fins are not shown for the sake of simplicity.

Next, the baffle 19 will be described in more detail with reference to FIGS.
As shown in FIGS. 4 and 6, the baffle 19 includes a main body portion 19a, a first convex portion 19b, a second convex portion 19c, a first wall 19d, a second wall 19e, and a reinforcing portion. 19f and an opening 19g. In the present embodiment, the baffle 19 includes a plurality of main body portions 19a, first convex portions 19b, second convex portions 19c, reinforcing portions 19f, and openings 19g.

  The main body portion 19 a extends in the axial direction of the heat transfer tube 13. The main body 19a divides the internal space IS into a first space IS1 and a second space IS2 in the radial direction of the heat transfer tube 13. The main body 19a is formed in a flat plate shape. The axial width of the heat transfer tube 13 of the main body 19a is constant.

  The first convex portion 19b protrudes from the main body portion 19a to the first space IS1 (one side of the internal space IS). The second convex portion 19c protrudes from the main body portion 19a to the second space IS2 (the other side of the internal space IS). The first convex portion 19b and the second convex portion 19c protrude in an oblique direction with respect to the axial center line of the heat transfer tube 13, respectively.

  As shown by the arrow A in FIG. 4, the heating gas flows from top to bottom. The first space IS1 of the heat transfer tube 13 is disposed on the upstream side of the flow of the heating gas, and the second space IS2 is disposed on the downstream side of the flow of the heating gas. Therefore, the 1st convex part 19b is arrange | positioned in the upstream of the flow of the gas for a heating. That is, the first convex portion 19 b is arranged on the heating side of the heat transfer tube 13. On the other hand, the 2nd convex-shaped part 19c is arrange | positioned in the downstream of the flow of the gas for a heating. That is, the second convex portion 19 c is arranged on the non-heating side of the heat transfer tube 13.

  When the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the height at which the first convex portion 19b protrudes from the main body portion 19a into the first space IS1 is second. The convex portion 19c is larger than the height at which the convex portion 19c protrudes from the main body portion 19a into the second space IS2. Moreover, when the 1st convex part 19b and the 2nd convex part 19c are seen from the axial direction of the heat exchanger tube 13, the projection area P1 of the 1st convex part 19b is the projection area P2 of the 2nd convex part 19c. Bigger than.

  Each of the first convex portion 19b and the second convex portion 19c is disposed between the first wall 19d and the second wall 19e. The 1st convex part 19b and the 2nd convex part 19c are connected to the main-body part 19a along with the direction where the 1st end part 19a1 and 2nd end part 19a2 of the main-body part 19a oppose. In the middle position of the baffle 19 in the short direction, the protruding direction with respect to the main body portion 19a of the first convex portion 19b and the second convex portion 19c is reversed. A first convex portion 19b and a second convex portion 19c are connected to both sides of one main body portion 19a in the axial direction of the heat transfer tube 13, respectively.

  The first wall 19d is connected to the first end 19a1 of the main body 19a. The first wall 19 d extends in the axial direction of the heat transfer tube 13. The first wall 19d has a first protruding wall 19d1 and a second protruding wall 19d2. The first protruding wall 19d1 protrudes from the main body portion 19a into the first space IS1. The second protruding wall 19d2 protrudes from the main body portion 19a into the second space IS2.

  The second wall 19e is connected to the second end 19a2 of the main body 19a. The second wall 19 e extends in the axial direction of the heat transfer tube 13. The second wall 19e has a third protruding wall 19e1 and a fourth protruding wall 19e2. The third protruding wall 19e1 protrudes from the main body portion 19a into the first space IS1. The fourth protruding wall 19e2 protrudes from the main body portion 19a into the second space IS2.

  A main body portion 19a, a reinforcing portion 19f, and an opening portion 19g are arranged side by side in the axial direction of the heat transfer tube 13. The reinforcing part 19f connects the first wall 19d and the second wall 19e. The reinforcing portion 19f is disposed in the axial direction of the heat transfer tube 13 with a space from the main body portion 19a. In the axial direction of the heat transfer tube 13, the width of the reinforcing portion 19f is larger than the width of the main body portion 19a. The reinforcing portion 19f is disposed between two main body portions 19a adjacent to each other in the axial direction of the heat transfer tube 13.

  The opening portion 19g is disposed between the main body portion 19a and the reinforcing portion 19f in the axial direction of the heat transfer tube 13. The opening 19g penetrates the main body 19a and the reinforcing part 19f in the thickness direction. That is, the first space IS1 and the second space IS2 of the heat transfer tube 13 communicate with each other through the opening 19g.

  As shown in FIGS. 4 and 5, from the tip of the first convex portion 19 b in the first space IS 1 when the first convex portion 19 b and the second convex portion 19 c are viewed from the axial direction of the heat transfer tube 13. The length H to the tip of the second convex portion 19c in the second space IS2 is equal to or shorter than the length of the elliptical short axis D of the cross section of the heat transfer tube 13.

  As shown in FIGS. 5 and 9, the height of the first convex portion 19b when the first convex portion 19b is viewed from the axial direction of the heat transfer tube 13 is equal to the height of the first protruding wall 19d1 and the first convex portion 19b1. It is larger than the height of the three protruding walls 19e1. The height of the 2nd convex part 19c when seeing the 2nd convex part 19c from the axial direction of the heat exchanger tube 13 is below the height of the 2nd protrusion wall 19d2, and the height of the 4th protrusion wall 19e2.

  When the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the height at which the first convex portion 19b protrudes from the main body portion 19a into the first space IS1 is the heat transfer tube 13. The height at which the second convex portion 19c protrudes from the main body portion 19a into the second space IS2 is smaller than the radius of the inner diameter of the heat transfer tube 13.

  In the present embodiment, the cross section of the internal space IS in the radial direction of the heat transfer tube 13 is elliptical. Therefore, specifically, when the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the first convex portion 19b protrudes from the main body portion 19a into the first space IS1. The height at which the second convex portion 19c protrudes from the main body portion 19a into the second space IS2 is greater than the radius of the major axis of the elliptical section. small.

  As shown in FIGS. 6 and 7, each of the first projecting wall 19 d 1, the second projecting wall 19 d 2, the third projecting wall 19 e 1, and the fourth projecting wall 19 e 2 extends in the axial direction of the heat transfer tube 13. In the direction in which the first end 19a1 and the second end 19a2 of the main body 19a face each other, the first projecting wall 19d1 and the third projecting wall 19e1 are displaced from each other, and the second projecting wall 19d2 and the fourth projecting wall 19e2 is deviated from each other. In the middle position of the baffle 19 in the longitudinal direction, the direction in which the first wall 19d and the second wall 19e protrude with respect to the main body portion 19a is reversed.

  As shown in FIGS. 6 and 8, the first protruding wall 19 d 1 and the second protruding wall 19 d 2 have the same length in the axial direction of the heat transfer tube 13. The third protruding wall 19e1 and the fourth protruding wall 19e2 have the same length in the axial direction of the heat transfer tube 13.

  As shown in FIGS. 6 and 7, the baffle 19 has a first hook S <b> 1 for fixing to the heat transfer tube 13. The first hook S <b> 1 is provided at the front end FP of the baffle 19 in the axial direction of the heat transfer tube 13. The first hook portion S1 is provided on the first wall 19d and the second wall 19e. The first hooking portion S1 extends beyond the front end portion FP of the baffle 19 in the axial direction of the heat transfer tube 13 toward the rear end portion BP so that the distance between the first wall 19d and the second wall 19e increases. The interval between the first wall 19d and the second wall 19e is configured to be small. The first hook S <b> 1 is hooked on one end surface of the heat transfer tube 13 in the axial direction of the heat transfer tube 13. On the front end portion FP side of the baffle 19, the main body portion 19a is not formed between the end portions of the first protruding wall 19d1 and the fourth protruding wall 19e2.

  As shown in FIGS. 5 and 6, the baffle 19 has a second hooking portion S <b> 2 for fixing to the heat transfer tube 13. The second hook S <b> 2 is provided at the rear end BP of the baffle 19 in the axial direction of the heat transfer tube 13. As shown in FIGS. 6 and 7, the second hooking portion S2 is provided on the first wall 19d and the second wall 19e. The second hooking portion S2 is configured to protrude to the front end portion FP side of the baffle 19 after protruding so that the distance between the first wall 19d and the second wall 19e becomes large at the rear end portion BP of the baffle 19. Yes. The second hook S <b> 2 is hooked on the other end surface of the heat transfer tube 13 in the axial direction of the heat transfer tube 13. On the rear end BP side of the baffle 19, a main body 19a is also formed between the ends of the second projecting wall 19d2 and the third projecting wall 19e1.

  As shown in FIGS. 6 and 10, a part of the hot water flowing inside the heat transfer tube 13 meanders through the first space IS1 and the second space IS2 of the heat transfer tube 13 through the opening 19g of the baffle 19. Flowing. In the first space IS1 of the internal space IS of the heat transfer tube 13, the turbulent flow of hot water flowing inside the heat transfer tube 13 is promoted by the first convex portion 19b. In the second space IS2 of the internal space IS of the heat transfer tube 13, the pressure loss of the hot water flowing inside the heat transfer tube 13 is reduced by the second convex portion 19c.

Next, the effect of this Embodiment is demonstrated.
According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, the first convex portion 19b is arranged on the upstream side of the flow of the heating gas, so that on the heating side of the heat transfer tube 13, Turbulent flow of hot water is positively promoted by the first convex portion 19b. For this reason, generation | occurrence | production of the boiling noise of hot water can be suppressed. On the other hand, by disposing the second convex portion 19c on the downstream side of the flow of the heating gas, the pressure loss of hot water is reduced by the second convex portion 19c on the non-heating side of the heat transfer tube 13. For this reason, the water flow resistance can be suppressed. Since the boiling noise of hot water is unlikely to occur on the non-heating side, the height at which the second convex portion 19c protrudes from the main body portion 19a into the second space IS2 is the first convex portion 19b from the main body portion 19a. Even if it is smaller than the height which protrudes in 1 space IS1, generation | occurrence | production of boiling boiling noise of hot water can be suppressed.

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, the first protruding wall 19d1 in the first space IS1 and the second space IS2 at the first end 19a1 of the main body 19a of the baffle 19 and The second projecting wall 19d2 is in contact with the heat transfer tube 13, and the third projecting wall 19e1 and the fourth projecting wall 19e2 are in contact with the heat transfer tube 13 in the first space IS1 and the second space IS2 in the rear end BP of the main body 19a. can do. Thereby, when the baffle 19 is inserted into the heat transfer tube 13, the rotation inside the heat transfer tube 13 is suppressed. Therefore, it becomes easy to assemble the baffle 19 inside the heat transfer tube 13.

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, the baffle 19 can be fixed to the heat transfer tube 13 by the first hooking portion S1. Further, the first hooking portion S1 is elastically deformed so that the interval between the first wall 19d and the second wall 19e becomes small in a state where the first hooking portion S1 is inserted into the inner space IS of the heat transfer tube 13, so that the first hooking portion S1 is located outside the inner space IS. It is restored when moved, and can be hooked on one end face of the heat transfer tube 13 in the axial direction. Therefore, it is easy to fix the baffle 19 to the heat transfer tube 13. On the front end FP side of the baffle 19, since the main body 19a is not formed between the ends of the first protruding wall 19d1 and the fourth protruding wall 19e2, elastic deformation is easy.

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, the baffle 19 can be fixed to the heat transfer tube 13 by the second hooking portion S2. Further, since the baffle 19 cannot be inserted into the heat transfer tube 13 from the rear end BP side by the second hooking portion S2, the insertion direction of the baffle 19 into the heat transfer tube 13 can be regulated. Thereby, it can prevent that the baffle 19 is inserted in a reverse direction. On the rear end BP side of the baffle 19, the main body 19a is also formed between the end portions of the second projecting wall 19d2 and the third projecting wall 19e1, so that the end portion is not easily elastically deformed. Therefore, it can suppress that 2nd hook part S2 enters into the heat exchanger tube 13 unintentionally.

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, when the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the first convex portion The height at which the convex portion 19b protrudes from the main body portion 19a into the first space IS1 is larger than the radius of the inner diameter of the heat transfer tube 13, and the height at which the second convex portion 19c protrudes from the main body portion 19a into the second space IS2 is It is smaller than the radius of the inner diameter of the heat transfer tube 13. Therefore, by arranging the first convex portion 19b on the upstream side of the flow of the heating gas, the first convex portion 19b effectively promotes the turbulent flow of hot water on the heating side of the heat transfer tube 13. On the other hand, by disposing the second convex portion 19c on the downstream side of the flow of the heating gas, the pressure loss of hot water is effectively reduced by the second convex portion 19c on the non-heating side of the heat transfer tube 13. .

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, when the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the first convex portion The height at which the convex portion 19b protrudes from the main body portion 19a into the first space IS1 is larger than the radius of the major axis of the elliptical section, and the second convex portion 19c protrudes from the main body portion 19a into the second space IS2. The length is smaller than the radius of the major axis of the elliptical section. Therefore, by arranging the first convex portion 19b on the upstream side of the flow of the heating gas, the turbulent flow of hot water is effective on the long axis of the ellipse by the first convex portion 19b on the heating side of the heat transfer tube 13. Promoted. On the other hand, by disposing the second convex portion 19c on the downstream side of the flow of the heating gas, the pressure loss of the hot water is caused by the second convex portion 19c on the long axis of the elliptical shape on the non-heating side of the heat transfer tube 13. Effectively reduced.

  According to the sensible heat recovery heat exchanger (heat exchanger) 10 of the present embodiment, when the first convex portion 19b and the second convex portion 19c are viewed from the axial direction of the heat transfer tube 13, the first convex portion The projected area P1 of the convex part 19b is larger than the projected area P2 of the second convex part 19c. Therefore, by arranging the first convex portion 19b on the upstream side of the flow of the heating gas, the first convex portion 19b effectively promotes the turbulent flow of hot water on the heating side of the heat transfer tube 13. On the other hand, by disposing the second convex portion 19c on the downstream side of the flow of the heating gas, the pressure loss of hot water is effectively reduced by the second convex portion 19c on the non-heating side of the heat transfer tube 13. .

  A hot water apparatus 100 according to the present embodiment includes a sensible heat recovery heat exchanger (heat exchanger) 10 and a burner 30 for generating a heating gas supplied to the sensible heat recovery heat exchanger (heat exchanger) 10. And. According to the hot water device 100 of the present embodiment, sensible heat that can suppress the occurrence of boiling noise of hot water flowing inside the heat transfer tube 13 and can suppress the flow resistance of the hot water flowing inside the heat transfer tube 13. A hot water apparatus 100 including a recovered heat exchanger (heat exchanger) 10 can be provided.

  Next, various modifications of the baffle 19 of the present embodiment will be described with reference to FIGS. 11 and 12. Note that the configurations of the various modifications are the same as the configurations of the present embodiment unless otherwise specified, and therefore, the same elements are denoted by the same reference numerals and description thereof is not repeated.

  As shown in FIG. 11, in the first modification of the baffle 19, the configuration of the second convex portion 19c is different from that of the present embodiment. In the first modification of the baffle 19, the first convex portion 19b protrudes from the main body 19a so as to form an obtuse angle with the main body 19a. The 2nd convex part 19c protrudes from the main-body part 19a so that the main-body part 19a may make an obtuse angle. The angle formed between the first convex portion 19b and the main body portion 19a is smaller than the angle formed between the second convex portion 19c and the main body portion 19a. The shape of the first convex portion 19b when the first convex portion 19b is viewed from a direction orthogonal to the angle formed by the first convex portion 19b and the main body portion 19a is the second convex portion 19c and the main body portion 19a. This is the same as the shape of the second convex portion 19c when the second convex portion 19c is viewed from the direction perpendicular to the angle between the two.

  According to the first modification of the baffle 19, the first and second convex portions 19b and 19b are bent by bending the first convex portion 19b and the second convex portion 19c having the same shape so as to form an obtuse angle with the main body portion 19a. A shaped portion 19c can be provided. For this reason, since it becomes possible to produce the 1st convex part 19b and the 2nd convex part 19c with the same metal mold | die, productivity can be improved.

  As shown in FIG. 12, in the second modification of the baffle 19, the configuration of the second hooking portion S2 is different from that of the present embodiment. In the second modification of the baffle 19, the baffle 19 has a second hooking portion S <b> 2 for fixing to the heat transfer tube 13. The second hook S <b> 2 is provided at the rear end BP of the baffle 19 in the axial direction of the heat transfer tube 13. The second hook S2 is provided on the first wall 19d and the second wall 19e. The second hooking portion S2 extends in the axial direction of the heat transfer tube 13 from the rear end BP of the baffle 19 toward the front end FP so that the distance between the first wall 19d and the second wall 19e increases. The interval between the first wall 19d and the second wall 19e is configured to be small. The second hook S <b> 2 is hooked on the other end surface of the heat transfer tube 13 in the axial direction of the heat transfer tube 13.

  According to the second modification of the baffle 19, the baffle 19 can be fixed to the heat transfer tube 13 by the second hooking portion S2. Further, the second hooking portion S2 is elastically deformed so that the interval between the first wall 19d and the second wall 19e becomes small in a state where the second hooking portion S2 is inserted into the inner space IS of the heat transfer tube 13, and is outside the inner space IS. It is restored when moved, and can be hooked on the other end face of the heat transfer tube 13 in the axial direction. Therefore, it is easy to fix the baffle 19 to the heat transfer tube 13. Further, the baffle 19 can be inserted into the heat transfer tube 13 from either the front end FP or the rear end BP of the baffle 19.

The above-described embodiment and various modifications can be combined as appropriate.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 Sensible Heat Recovery Heat Exchanger, 11 Case, 12 Header, 13 Heat Transfer Tube, 14 Spark Plug, 16 Fin, 17 Holding Member, 18 Fixing Member, 19 Baffle, 19a Main Body, 19b First Convex Part, 19c Second Convex part, 19d first wall, 19d1 first projecting wall, 19d2 second projecting wall, 19e second wall, 19e1 third projecting wall, 19e2 fourth projecting wall, 19f reinforcing part, 19g opening, 20 latent heat recovery heat Exchanger, 30 burner, 31 chamber, 32 air blower, 33 duct, 34 venturi, 35 orifice, 36 gas valve, 40 piping, 41 bypass piping, 42 three-way valve, 43 liquid-liquid heat exchanger, 44 hot water piping, 50 housing , 100 water heater, IS internal space, S1 first hook, S2 second hook.

Claims (10)

A heat transfer tube for flowing hot water into the internal space,
A baffle disposed in the internal space of the heat transfer tube and for generating a turbulent flow in the hot water in the internal space;
The baffle is
A main body that extends in the axial direction of the heat transfer tube and divides the internal space into a first space and a second space in the radial direction of the heat transfer tube;
A first convex portion projecting from the main body portion into the first space;
A second convex portion protruding from the main body portion into the second space,
When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is The heat exchanger, wherein the second convex portion is larger than a height protruding from the main body portion to the second space. The baffle is
A first wall connected to the first end of the main body and extending in the axial direction of the heat transfer tube;
A second wall connected to the second end of the main body and extending in the axial direction of the heat transfer tube;
Each of the first convex portion and the second convex portion is disposed between the first wall and the second wall,
The first wall includes a first protruding wall protruding from the main body portion into the first space, and a second protruding wall protruding from the main body portion into the second space,
2. The heat exchange according to claim 1, wherein the second wall includes a third protruding wall protruding from the main body portion into the first space and a fourth protruding wall protruding from the main body portion into the second space. vessel. The baffle includes a first hook for fixing to the heat transfer tube,
The first hook portion is provided on the first wall and the second wall, and the first wall extends from the front end portion of the baffle toward the rear end portion in the axial direction of the heat transfer tube. 3. The heat exchanger according to claim 2, wherein the heat exchanger is configured such that the distance between the first wall and the second wall decreases after projecting so as to increase the distance between the second wall and the second wall. The baffle includes a second hook for fixing to the heat transfer tube,
The second hooking portion is provided on the first wall and the second wall, and a distance between the first wall and the second wall is increased at the rear end portion of the baffle. The heat exchanger according to claim 3, wherein the heat exchanger is configured to protrude toward the front end side of the baffle after being overhanged. The baffle includes a second hook for fixing to the heat transfer tube,
The second hooking portion is provided on the first wall and the second wall, and the first end toward the front end portion from the rear end portion of the baffle in the axial direction of the heat transfer tube. 4. The heat exchanger according to claim 3, wherein the heat exchanger is configured such that the distance between the first wall and the second wall is reduced after the wall and the second wall are extended so as to increase. The first convex portion protrudes from the main body so as to form an obtuse angle with the main body,
The second convex portion protrudes from the main body so as to form an obtuse angle with the main body,
The angle formed by the first convex portion and the main body portion is smaller than the angle formed by the second convex portion and the main body portion,
The shape of the first convex portion when the first convex portion is viewed from a direction orthogonal to the angle formed by the first convex portion and the main body portion is the second convex portion and the main body portion. The heat exchanger according to any one of claims 1 to 5, wherein the heat exchanger has the same shape as that of the second convex portion when the second convex portion is viewed from a direction orthogonal to an angle between the first convex portion and the second convex portion.   When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is the transmission distance. The height at which the second convex portion protrudes from the main body portion into the second space is smaller than the radius of the inner diameter of the heat transfer tube, and is larger than the radius of the inner diameter of the heat tube. The heat exchanger according to item. The cross section of the internal space of the heat transfer tube in the radial direction of the heat transfer tube is elliptical,
When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the height at which the first convex portion protrudes from the main body portion into the first space is the cross section. A height at which the second convex portion protrudes from the main body portion into the second space is smaller than a radius of the elliptical major axis of the cross section, The heat exchanger according to any one of claims 1 to 6.   When the first convex portion and the second convex portion are viewed from the axial direction of the heat transfer tube, the projected area of the first convex portion is larger than the projected area of the second convex portion. The heat exchanger according to any one of claims 1 to 8. The heat exchanger according to any one of claims 1 to 9,
A hot water apparatus comprising a burner for generating a heating gas supplied to the heat exchanger.

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