JP7199842B2 - water heat exchanger, gas cooler - Google Patents

Description

The present invention relates to water heat exchangers and gas coolers.

As an example of the heat exchanger, one described in Patent Document 1 below is known. The heat exchanger according to Patent Document 1 includes a pair of cylindrical first headers, a pair of second headers, a plurality of first heat transfer tubes connecting between the pair of first headers, and a pair of and a second heat transfer tube that connects between the second headers. The plurality of first heat transfer tubes are arranged at intervals between the pair of first headers. Similarly, the plurality of second heat transfer tubes are spaced apart from each other between the pair of second headers. Holes for inserting the first heat transfer tubes and the second heat transfer tubes are formed in the outer peripheral surfaces of the first header and the second header. The ends of the first heat transfer tubes and the ends of the second heat transfer tubes protrude slightly into the spaces inside the first header and the second header. Since the first heat transfer tube and the second heat transfer tube are in contact with each other, heat exchange is performed between the fluids flowing inside both.

Japanese Patent Application Laid-Open No. 2012-21682

Here, in the configuration described in Patent Document 1, the ends (insertion margins) of the first heat transfer tubes and the second heat transfer tubes are exposed inside the first header and the second header. Furthermore, the first heat transfer tube and the second heat transfer tube are inserted in directions orthogonal to the first header and the second header, respectively. Therefore, when the refrigerant flows from the header into the heat transfer tubes, separation may occur in the flow of the refrigerant. If separation occurs in the flow of the coolant, the local flow velocity increases, and there is a risk of erosion or pitting corrosion occurring at that portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water heat exchanger and a gas cooler with improved durability.

According to a first aspect of the present invention, a water heat exchanger includes a header having a tubular header body extending in a first axial direction and through which water flows toward one side in the first axial direction; a tubular heat transfer tube that is provided so as to protrude into the header from the outer peripheral surface of the header body and that extends toward one side in the first axial direction toward the outer peripheral side of the header body. The header has an inlet-side header and an outlet-side header, the water flows toward one side in the first axial direction inside the inlet-side header, and the water flows inside the outlet-side header, After flowing through the heat transfer tubes, the water flows toward the other side in the first axial direction, and the heat transfer tubes are provided in plurality at intervals in the first axial direction, and are arranged along the first axial line. The inclination angle, which is the angle formed by the second axis with respect to the orthogonal reference axis, increases as the heat transfer tube is located on the other side in the first axis direction.

According to this configuration, the heat transfer tubes extend from the other side in the first axial direction toward the one side toward the outer peripheral side of the header body. Here, inside the header main body, water flows from the other side in the first axial direction toward the one side. That is, the heat transfer tubes extend in a direction including the water flow direction component. Therefore, in the above configuration, the water in the header body can be guided to the heat transfer tubes more smoothly than in the case where the heat transfer tubes extend in the direction perpendicular to the first axis. As a result, separation and swirl in the flow of water are reduced, and the flow velocity of water in the header body and heat transfer tubes can be made uniform.
Also, water flows through the header main body from the other side in the first axial direction toward the one side. Along the way, water sequentially flows into a plurality of heat transfer tubes. That is, the water flows at a higher flow velocity into the heat transfer tubes located on the other side in the first axial direction. According to the above configuration, since the heat transfer tube located on the other side in the first axial direction has a larger inclination angle, it is possible to smoothly guide water at a high flow rate into the heat transfer tube. That is, it is possible to further reduce the possibility of turbulence occurring in the flow of water.

According to the second aspect of the present invention, an inclination angle, which is an angle formed by the second axis with respect to a reference axis perpendicular to the first axis, may be 10 to 45 degrees.

According to this configuration, the water in the header body can be more smoothly guided toward the heat transfer tubes. As a result, separation and swirl in the flow of water are reduced, and the flow velocity of water in the header body and heat transfer tubes can be made uniform.

According to a third aspect of the present invention, a gas cooler includes the water heat exchanger according to any one of the above aspects, and a gas flow pipe in contact with the outer peripheral surface of the heat transfer pipe and through which gas flows .
According to a fourth aspect of the present invention, a gas cooler includes: a header extending in a first axial direction and having a tubular header body through which water flows toward one side in the first axial direction; a tubular heat transfer tube that is provided so as to protrude from the outer peripheral surface into the header and extends toward one side in the first axial direction toward the outer peripheral side of the header body and has a tubular shape along the second axis. an exchanger, and a gas flow pipe in contact with the outer peripheral surface of the heat transfer pipe and through which gas flows, the header has an inlet side header and an outlet side header, and the inlet side header Inside, the water flows toward one side in the first axial direction, and inside the outlet-side header, after flowing through the heat transfer tubes, the water flows toward the other side in the first axial direction.

According to this configuration, it is possible to provide a gas cooler with improved durability.
According to a fifth aspect of the present invention, a water heat exchanger includes a header having a tubular header body extending in a first axial direction and through which water flows toward one side in the first axial direction; a tubular heat transfer tube that is provided so as to protrude into the header from the outer peripheral surface of the header body and that extends toward one side in the first axial direction toward the outer peripheral side of the header body. A plurality of heat transfer tubes are provided at intervals in the first axis direction, and the inclination angle, which is the angle formed by the second axis with respect to a reference axis orthogonal to the first axis, is the second The heat transfer tube located on the other side in the one axial direction is larger.

According to the present invention, it is possible to provide a water heat exchanger and a gas cooler with improved durability.

It is a mimetic diagram showing composition of a gas cooler concerning a first embodiment of the present invention. 1 is an enlarged cross-sectional view of a main part of a gas cooler according to a first embodiment of the invention; FIG. FIG. 4 is an enlarged cross-sectional view showing the configuration of the burring portion according to the first embodiment of the present invention; FIG. 5 is an enlarged cross-sectional view of a main part of a gas cooler according to a second embodiment of the invention;

[First embodiment]
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. A gas cooler 100 according to the present embodiment is arranged in a water heater cycle as an example. More specifically, the gas cooler 100 heats the water by exchanging heat between the water and gas as a heat medium.

As shown in FIG. 1 , the gas cooler 100 includes a water heat exchanger 90 and multiple gas flow pipes 3 . A water heat exchanger 90 has a header 1 and a plurality of heat transfer tubes 2 . The header 1 has an inlet side header 1A and an outlet side header 1B. The inlet side header 1A has a tubular header body 11 extending along the first axis A1, an introduction portion 12, and a burring portion 13 (see FIG. 2). An introduction portion 12 for introducing water from the outside is provided at the other end portion of the header main body 11 in the direction of the first axis A1. The water guided from the introduction part 12 flows from the other side in the direction of the first axis A1 toward the one side. The outlet side header 1B is a tubular member arranged parallel to the inlet side header 1A. A discharge portion 14 for guiding the heated water to the outside is provided at the end of the outlet side header 1B. In addition, the introduction part 12 may be provided not only at the end of the header main body 11 but also at an intermediate part in the extending direction of the header main body 11 .

A plurality of heat transfer tubes 2 are arranged between the inlet side header 1A and the outlet side header 1B. A plurality of heat transfer tubes 2 are arranged at intervals in the extending direction of the inlet side header 1A and the outlet side header 1B. Inside each heat transfer tube 2, a flow path is formed for the flow of water. The water that has flowed into the inlet side header 1A flows through these heat transfer tubes 2 to the outlet side header 1B. A gas flow tube 3 is helically wound around the outer peripheral surface of each heat transfer tube 2 so as to be in contact with the outer peripheral surface. A high-temperature gas as a heat medium flows through the inside of the gas flow pipe 3 . Carbon dioxide, for example, is preferably used as such gas. A plurality of gas flow pipes 3 are connected to headers different from the inlet side header 1A and the outlet side header 1B.

Next, the details of the connecting portion between the inlet side header 1A and the heat transfer tube 2 will be described with reference to FIG. FIG. 2 shows an enlarged connection portion between the inlet side header 1A and the plurality of heat transfer tubes 2. As shown in FIG. As shown in the figure, the inlet side header 1A has a cylindrical shape centered on the first axis A1. Each heat transfer tube 2 extends along a second axis A2 that intersects the direction of the first axis A1 between the inlet side header 1A and the outlet side header 1B. The angle (tilt angle θ) formed by the second axis A2 with respect to the reference axis Ac orthogonal to the first axis A1 is preferably 10° to 45°. More preferably, the inclination angle θ is 20° to 35° with respect to the reference axis Ac. Most preferably, the tilt angle θ is 30° with respect to the reference axis Ac. In addition, in this embodiment, the inclination angles θ of the heat transfer tubes 2 are the same.

A burring portion 13 that supports the end portion of each heat transfer tube 2 is provided on the outer peripheral surface of the inlet side header 1A (header main body 11). The burring portion 13 has an annular shape that protrudes radially outward from the outer peripheral surface of the inlet side header 1A with respect to the first axis A1. More specifically, as shown in FIG. 3, the outer peripheral surface of the burring portion 13 has a cylindrical shape centered on the reference axis Ac. On the other hand, the inner peripheral surface (insertion hole 15) of the burring portion 13 has a cylindrical shape centered on the second axis A2. That is, in a cross-sectional view including the first axis A1, the insertion hole 15 extends in a direction inclined by the above-described inclination angle θ with respect to the reference axis Ac.

As shown in FIG. 2 again, the ends of the heat transfer tubes 2 are inserted into the respective insertion holes 15 from the outer peripheral side. When inserted into the insertion hole 15, the end of each heat transfer tube 2 protrudes into the inlet side header 1A. At least one protrusion P for determining (positioning) the amount of insertion into the insertion hole 15 is provided on the outer peripheral surface of the heat transfer tube 2 . That is, each heat transfer tube 2 is inserted into the insertion hole 15 until the projection P contacts the end surface of the burring portion 13 . In this manner, the outer peripheral surface of each heat transfer tube 2 abuts against the inner peripheral surface (insertion hole 15) of the burring portion 13, so that each heat transfer tube 2 is supported so as not to be displaced. In addition, in this embodiment, the burring portion 13 is provided integrally with the header main body 11 . However, it is also possible to employ a configuration in which the burring portion 13 prepared separately from the header body 11 is attached to the header body 11 by brazing or the like.

Next, operation of the gas cooler 100 according to this embodiment will be described. Low-temperature water (water before heating) flows through the header 1 and the heat transfer tubes 2 as the water heater starts operating. Specifically, water is supplied from the introduction part 12 of the inlet side header 1A and distributed to each heat transfer tube 2 . At the same time, relatively high-temperature gas (heat medium) flows through the gas flow pipe 3 . Since the gas flow pipe 3 is in contact with the outer peripheral surface of the heat transfer pipe 2 as described above, heat transfer occurs between the water and the gas. That is, the heat of the relatively high-temperature gas propagates to the water in the heat transfer tubes 2, which is relatively low-temperature, thereby heating the water. The heated water is collected from each heat transfer tube 2 to the outlet side header 1B and then taken out to the outside through the discharge section 14 .

Here, each heat transfer tube 2 forms an angle with respect to the inlet side header 1A. Therefore, when water flows into the heat transfer tubes 2 from the inlet side header 1A, flow separation may occur. When separation occurs in the flow of water, the local flow velocity increases, and there is a risk of erosion or pitting occurring at that portion. In particular, when the inlet-side header 1A and the heat transfer tubes 2 are connected so as to be perpendicular to each other, the direction of the water flow changes abruptly, so the phenomenon described above is likely to occur.

However, in the gas cooler 100 according to the present embodiment, the heat transfer tubes 2 extend from the other side in the first axis A1 direction toward the one side toward the outer peripheral side of the header body 11 . Here, inside the header body 11, water flows from the other side in the direction of the first axis A1 toward the one side. That is, the heat transfer tube 2 extends in a direction including this water flow direction component. Therefore, compared to a configuration in which the heat transfer tubes 2 extend in a direction perpendicular to the first axis A1, for example, the above configuration allows the water in the header body 11 to be guided to the heat transfer tubes 2 more smoothly. . As a result, separation and swirl in the flow of water are reduced, and the flow velocity of water in the header body 11 and the heat transfer tubes 2 can be made uniform. Therefore, the possibility of corrosion or pitting occurring inside the gas cooler 100 is reduced, and the durability of the gas cooler 100 can be improved.

Furthermore, in the above configuration, the inclination angle θ, which is the angle formed by the second axis A2 with respect to the reference axis Ac orthogonal to the first axis A1, is set to 10° to 45°. More preferably, the inclination angle θ is 20° to 35° with respect to the reference axis Ac. Most preferably, the tilt angle θ is 30° with respect to the reference axis Ac. According to this configuration, the water in the header body 11 can be more smoothly guided toward the heat transfer tubes 2 . As a result, separation and swirl in the flow of water are reduced, and the flow velocity of water in the header body 11 and the heat transfer tubes 2 can be made uniform.

In addition, according to the above configuration, the burring portion 13 is provided at the insertion portion of the heat transfer tube 2 on the outer peripheral surface of the header body 11 . That is, the heat transfer tube 2 can be fixed to the header main body 11 by the burring portion 13 . As a result, the insertion amount (insertion allowance) of the heat transfer tube 2 into the head body can be reduced compared to the case where the burring portion 13 is not provided. Here, if the amount of insertion of the heat transfer tubes 2 is too large, the flow of water flowing through the header body 11 may be disturbed by the ends of the heat transfer tubes 2 . As a result, separation and swirling occur in the water flow. However, according to the above configuration, since the insertion allowance is small, such possibility can be reduced.

The first embodiment of the present invention has been described above with reference to FIGS. 1 to 3. FIG. Various changes and modifications can be made to the above configuration without departing from the gist of the present invention. For example, in the above embodiment, an example in which the gas cooler 100 is applied to a water heater that heats water has been described. However, the target of application of the gas cooler 100 is not limited to a water heater, and the gas cooler 100 can be applied to any device including an air conditioner as long as it is a device for exchanging heat between fluids. .

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to FIG. In addition, the same code|symbol is attached|subjected about the structure similar to said 1st embodiment, and detailed description is abbreviate|omitted. As shown in FIG. 4, in the gas cooler 200 according to the present embodiment, the inclination angles θ of the plurality of heat transfer tubes 2, that is, the angles formed by the second axis lines A2 of the heat transfer tubes 2 with respect to the first axis line A1, are different from each other. . In the description below, of the three heat transfer tubes 2 shown in FIG. The heat transfer tube 2 is called a third heat transfer tube 23 , and the heat transfer tube 2 located between them is called a second heat transfer tube 22 . The first heat transfer tube 21 extends along the second axis A21, and the second heat transfer tube 22 extends along the second axis A22. The third heat transfer tube 23 extends along the second axis A23. Let θ1 be the angle (tilt angle θ) that the second axis A21 makes with respect to the reference axis Ac, let θ2 be the angle (tilt angle) that the second axis A22 makes with respect to the reference axis Ac, and let θ2 be the angle (tilt angle) that the second axis A22 makes with respect to the reference axis Ac. is called θ3. In this embodiment, these tilt angles θ1, θ2, θ3 satisfy the relationship shown in the following equation (1).
θ1<θ2<θ3 (1)
That is, the inclination angle θ increases toward the heat transfer tube 2 located on the other side in the first axis A1 direction. In the example of FIG. 4, only three heat transfer tubes 2 are shown for the sake of simplification. Each tilt angle θ is set so as to satisfy

Here, water flows through the header main body 11 (inlet-side header 1A) from the other side in the direction of the first axis A1 toward the one side. Along the way, the water sequentially flows into the plurality of heat transfer tubes 2 . That is, water flows at a higher flow rate into the heat transfer tubes 2 positioned on the other side in the first axis A1 direction. According to the above configuration, since the inclination angle θ increases toward the heat transfer tubes 2 located on the other side in the first axis A1 direction, water having a high flow rate can be smoothly guided into the heat transfer tubes 2 . That is, it is possible to further reduce the possibility of turbulence occurring in the flow of water. As a result, separation and swirl in the flow of water are reduced, and the flow velocity of water in the header body 11 and the heat transfer tubes 2 can be made uniform. Therefore, the possibility of corrosion or pitting occurring inside the gas cooler 200 is reduced, and the durability of the gas cooler 200 can be further improved.

The second embodiment of the present invention has been described above with reference to FIG. Various changes and modifications can be made to the above configuration without departing from the gist of the present invention. For example, in the above embodiment, an example in which the gas cooler 200 is applied to a water heater that heats water has been described. However, the target of application of the gas cooler 200 is not limited to water heaters, and the gas cooler 200 can be applied to any device, including an air conditioner, as long as it is a device for exchanging heat between fluids. .

DESCRIPTION OF SYMBOLS 1... Header 2... Heat transfer tube 3... Gas distribution tube 11... Header main body 12... Introduction part 13... Burring part 14... Discharge part 15... Insertion hole 21... First heat transfer tube 22... Second heat transfer tube 23... Third heat transfer tube 90 Water heat exchangers 100, 200 Gas cooler 1A Inlet side header 1B Outlet side header A1 First axis A2 Second axis A21 A Second axis A22 B Second axis A23 C Second axis Ac … Reference axis θ … Inclination angle

Claims (5)

a header having a tubular header body extending in a first axial direction and through which water flows toward one side in the first axial direction;
a heat transfer tube having a tubular shape along a second axis that is provided so as to protrude into the header from the outer peripheral surface of the header body and extends toward one side in the first axial direction toward the outer peripheral side of the header body;
with
The header has an inlet side header and an outlet side header,
Inside the inlet side header, the water flows toward one side in the first axial direction,
inside the outlet-side header, the water after circulating through the heat transfer tubes circulates toward the other side in the first axial direction ,
A plurality of the heat transfer tubes are provided at intervals in the first axial direction,
A water heat exchanger in which an inclination angle, which is an angle formed by the second axis with respect to a reference axis perpendicular to the first axis, increases as the heat transfer tubes are positioned on the other side in the first axis direction . 2. The water heat exchanger according to claim 1, wherein an inclination angle, which is an angle formed by said second axis with respect to a reference axis perpendicular to said first axis, is 10 to 45 degrees. A water heat exchanger according to claim 1 or 2 ,
a gas flow tube in contact with the outer peripheral surface of the heat transfer tube and through which gas flows;
gas cooler with a header extending in a first axial direction and having a tubular header body through which water flows toward one side in the first axial direction; a water heat exchanger having a tubular heat transfer tube along a second axis extending toward one side in the first axis direction toward the outer peripheral side of the header body ;
a gas flow tube in contact with the outer peripheral surface of the heat transfer tube and through which gas flows;
has
The header has an inlet side header and an outlet side header,
Inside the inlet side header, the water flows toward one side in the first axial direction,
A gas cooler in which the water after circulating in the heat transfer tubes circulates toward the other side in the first axial direction inside the outlet side header. a header having a tubular header body extending in a first axial direction and through which water flows toward one side in the first axial direction;
a heat transfer tube having a tubular shape along a second axis that is provided so as to protrude into the header from the outer peripheral surface of the header body and extends toward one side in the first axial direction toward the outer peripheral side of the header body;
with
A plurality of the heat transfer tubes are provided at intervals in the first axial direction,
A water heat exchanger in which an inclination angle, which is an angle formed by the second axis with respect to a reference axis perpendicular to the first axis, increases as the heat transfer tubes are positioned on the other side in the first axis direction.

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