JP2014190569A - Water heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heating device including a latent-heat-collection auxiliary heat source machine and having a simple, low-cost structure capable of suppressing vibration noise derived from a booster pump.SOLUTION: A water heating device 1 includes: a latent-heat-collection heat exchanger 3d; an auxiliary-heat-source outgoing passage portion 12b (supply water passage) connected to this latent-heat-collection heat exchanger 3d; and a booster pump 20 installed in this auxiliary-heat-source outgoing passage portion 12b, and supplying hot water to the latent-heat-collection heat exchanger 3d. The auxiliary-heat-source outgoing passage portion 12b includes a pipe portion 21 ranging from the booster pump 20 to the latent-heat-collection heat exchanger 3d. A part of the pipe portion 21 is constituted by an enlarged pipe portion 22 having a larger inner diameter than that of the other part of the piping portion 21, and an orifice portion 26 is provided between the booster pump 20 and the enlarged portion 22 in the piping portion 21.

Description

  The present invention relates to a hot water apparatus, and more particularly to an apparatus having a structure capable of reducing vibration noise generated when a hot water is fed by driving a pressure pump to a heat source device.

  2. Description of the Related Art Conventionally, hot water apparatuses having functions such as hot water supply to hot water heating terminals such as hot water storage, hot water supply, floor heating panels, hot water supply to a bath, and reheating are widely used. This hot water device is a hot water storage tank that stores hot water heated by an external heat source device, a water supply passage that supplies low-temperature clean water to the hot water storage tank, and hot water stored in the hot water storage tank is supplied to a desired hot water supply destination such as a hot water tap. Heating passage for heating, hot water heating circuit for supplying heating water to hot water heating equipment such as floor heating panels, bath hot water supply circuit for hot water supply and reheating, heat for heating hot water heating circuit and bath hot water supply circuit A use circuit is provided.

  In the hot water apparatus described above, hot water containing bubbles may flow in the pipes constituting various passages and various circuits, and in this case, there is a problem that noise is generated due to the water flow sound. In order to solve such a problem, various literatures having a structure that suppresses noise as described below are disclosed.

  For example, Patent Document 1 discloses a structure in which a bypass pipe for bypassing a hot water heating device is installed in a hot water heating circuit, and in order to suppress a water flow noise generated in the bypass pipe, A structure is disclosed in which enlarged portions having an inner diameter larger than the inner diameter of the inflow portion provided at both ends are provided. According to this structure, the flow rate of the hot water is reduced by the enlarged portion, the bubbles contained in the hot water are brought together and grow, and the water flow noise can be reduced by reducing the collision frequency of the bubbles.

  By the way, in said hot water apparatus, what was equipped with the auxiliary heat source machine which reheats hot water when the temperature of the hot water in a hot water storage tank is low is also put in practical use. The auxiliary heat source unit incorporated in this hot water system is not only equipped with a heat exchanger that uses sensible heat of combustion gas, but also uses the latent heat of combustion exhaust gas after sensible heat recovery to improve thermal efficiency. Also provided are those equipped with a latent heat recovery type heat exchanger.

  When operating the above auxiliary heat source unit, the flow rate of hot water supplied to the auxiliary heat source unit has been reduced due to the structure in which a pressure reducing device is conventionally installed in the water supply passage so that excessive water pressure does not act on the hot water storage tank. There is a risk of a small amount depending on the decompression device. For this reason, it is necessary to install a pressurizing pump in the supply water channel connected to the auxiliary heat source unit, pressurize the hot water with this pressurizing pump, and send it to the auxiliary heat source unit.

JP-A-8-285296

  However, when hot water is pumped to the auxiliary heat source machine by the pressurizing pump, the vibration of the pressurizing pump propagates through the piping constituting the supply water channel and the hot water in the pipe and is directly propagated to the heat exchanger of the auxiliary heat source machine. .

  For this reason, when the auxiliary heat source unit has a structure including a latent heat recovery type heat exchanger, the latent heat recovery type heat exchanger is generally formed of stainless steel, which is a hard material. The latent heat recovery type heat exchanger vibrates in synchronism with this vibration, which causes a problem that the vibration leaks to the outside from the exhaust port.

  An object of the present invention is to provide a hot water apparatus equipped with a latent heat recovery type auxiliary heat source machine, which has an easy structure and a structure capable of suppressing vibration noise caused by a pressure pump at a low cost, and the like. That is.

  The hot water apparatus according to claim 1 is a latent heat recovery type heat exchanger, a supply water channel connected to the heat exchanger, a pressure pump installed in the supply water channel and for sending hot water to the heat exchanger, In the hot water apparatus, the supply water channel has a pipe part extending from the pressurizing pump to the heat exchanger, and a part of the pipe part has an inner diameter larger than the inner diameters of the other pipe parts. It is characterized by the fact that it is composed of an expanded section.

  The hot water device according to claim 2 is characterized in that, in the invention according to claim 1, an orifice portion is provided between the pressurizing pump and the pipe expanding portion in the pipe portion.

  According to a third aspect of the present invention, there is provided the hot water device according to the first or second aspect, wherein at least one bent portion is provided in the expanded pipe portion.

  According to the first aspect of the present invention, the supply water channel has a pipe part extending from the pressurizing pump to the heat exchanger, and a part of the pipe part has a larger inner diameter than the inner diameters of the other pipe parts. Therefore, the flow rate of the hot water discharged from the pressurizing pump is reduced by the expanded pipe portion having an enlarged inner diameter, and the water pressure of the hot water can be reduced.

  Therefore, by reducing the flow rate of the hot water discharged from the pressurizing pump and reducing the water pressure, the vibration energy of the vibration propagated from the pressurizing pump to the hot water can be attenuated. Vibration transmitted to the hot water can be prevented from leaking outside through the latent heat recovery type heat exchanger as much as possible. Therefore, vibration noise caused by the pressurizing pump can be suppressed easily and at low cost. it can.

  According to invention of Claim 2, since the orifice part was provided between the pressurization pump and pipe expansion part in a piping part, the vibration of the hot water discharged from the pressurization pump can be attenuated by an orifice part, Therefore, the vibration energy attenuation effect is further improved, and the vibration noise suppression effect due to the pressure pump is improved.

  According to the invention of claim 3, since at least one bent portion is provided in the expanded portion, the vibration energy attenuation effect is further improved by changing the flow direction of the hot water by the bent portion, and vibration caused by the pressurizing pump. The sound suppression effect is further improved.

It is a schematic block diagram of a hot water device. It is a perspective view of an auxiliary heat source machine, a pressure pump, and a piping part. It is a perspective view of the state which removed the heat insulating material from the piping part of FIG. It is a side view of the piping part of the state which removed the auxiliary heat source machine, the pressurization pump, and the heat insulating material. It is sectional drawing of a coupling member. It is sectional drawing of an orifice pipe member.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Next, the whole structure of the hot water device 1 of the present invention will be described.
As shown in FIG. 1, the hot water apparatus 1 has functions such as hot water storage, hot water supply, hot water supply to hot water heating terminals such as a floor heating panel, hot water supply to a bath, reheating, etc. Auxiliary heat source unit 3, first and second heat exchangers 4, 5, water supply passage 6, hot water supply passage 7, heating circulation circuit 8, bath hot water supply circuit 9, hot water heating circuit 11, heat utilization circulation circuit 12, control unit 13 and the like, and most of them are integrally stored in the outer case 14.

  The hot water apparatus 1 includes an exhaust heat recovery heat exchanger of a fuel cell power generator capable of heating hot water in the hot water storage tank 2 by a heat exchanger as an external heat source device, and the fuel cell power generator and the hot water apparatus 1. A fuel cell cogeneration system is configured by combining with a heating circulation circuit 8 or the like for circulating hot water between them, but a detailed description of the configuration other than the hot water device 1 is omitted.

Next, the hot water storage tank 2 will be described.
As shown in FIG. 1, the hot water storage tank 2 is composed of a sealed tank capable of storing high-temperature hot water (for example, 80 to 90 ° C.) heated by an external heat source device, and prevents heat dissipation of the stored hot water. The tank is covered with insulation.

Next, the auxiliary heat source unit 3 will be described.
As shown in FIG. 1, the auxiliary heat source unit 3 is provided in a heat utilization circuit 12 and is configured by a known gas water heater that burns fuel gas and heats hot water. The auxiliary heat source unit 3 includes a blower fan 3a for supplying combustion air, a burner unit 3b for burning fuel gas, a sensible heat recovery heat exchanger 3c for recovering mainly sensible heat of the combustion gas, and sensible heat A latent heat recovery heat exchanger 3d for recovering mainly latent heat of the recovered combustion exhaust gas is provided.

  The auxiliary heat source unit 3 transmits a command from the main control unit 13 only in a special case such as when the temperature of the hot water in the hot water storage tank 2 is lower than the set temperature or the temperature of the hot water circulating in the heat utilization circulation circuit 12 is insufficient. The hot water flowing through the heat utilization circulation circuit 12 is reheated and reheated. The hot water supplied to the auxiliary heat source unit 3 is heated by the latent heat of the combustion exhaust gas in the latent heat recovery heat exchanger 3d, and then supplied to the sensible heat recovery heat exchanger 3c. After being heated by 3c, it is supplied to the heat utilization circuit 12.

Next, the first and second heat exchangers 4 and 5 will be described.
The first heat exchanger 4 heats the hot water in the bath flowing through the bath hot water supply memorial circuit 9. The first heat exchanger 4 is a part of the heat utilization circulation circuit 12. It has an internal passage part 4b which becomes a part. In the first heat exchanger 4, heat is exchanged between the hot water flowing in the heat utilization circuit 12 and the hot water in the bath flowing in the bath hot water supply circuit 9, the hot water in the bath is heated, and the hot water is cooled. .

  The 2nd heat exchanger 5 heats the heating water which flows through the hot water heating circuit 11, and heat exchange passage part 5a which becomes a part of heat utilization circulation circuit 12, and heat exchange which becomes a part of the hot water heating circuit 11 It has a passage 5b. In the 2nd heat exchanger 5, heat exchange is carried out between the hot hot water which flows through the heat utilization circulation circuit 12, and the heating water which flows through the hot water heating circuit 11, heating water is heated, and hot water is cooled.

Next, the heating circulation circuit 8 will be described.
As shown in FIG. 1, the heating circulation circuit 8 is a closed circuit for circulating hot water between the hot water storage tank 2 and the external heat source machine, and has a forward circulation passage 8a and a return circulation passage 8b. The upstream end is connected to the lower part of the hot water storage tank 2, and the downstream end is connected to the upper part of the hot water storage tank 2 via an external heat source machine. A bypass passage portion 8c connected to the return-side circulation passage portion 8b is branched from the forward-side circulation passage portion 8a, and a hot water storage switching valve 8d is installed at this branch portion.

  In the normal heating circulation operation, as shown in FIG. 1, the hot water switching valve 8d is switched to the side that shuts off the bypass passage portion 8c, and hot water is circulated from the hot water storage tank 2 via a circulation pump (not shown). The hot and cold hot water supplied to the external heat source machine through the passage portion 8a and heated is returned to the hot water storage tank 2 through the return side circulation passage portion 8b.

Next, the water supply passage 6 and the hot water supply passage 7 will be described.
The water supply passage 6 supplies low temperature clean water from a water supply source to the hot water storage tank 2, and has an upstream water supply passage portion 6a, an intermediate water supply passage portion 6b, and a downstream water supply passage portion 6c. The downstream end is connected to the lower part of the hot water storage tank 2. A pressure reducing valve 6d (pressure reducing device) is installed in the upstream water supply passage 6a, and a check valve 6e is installed in the intermediate water supply passage 6b.

  In the water supply passage 6, a bypass passage portion 16 connected to the heat utilization circulation circuit 12 is branched from between the intermediate water supply passage portion 6b and the downstream water supply passage portion 6c, and a heat storage switching valve 6g is installed in this branch portion. Yes. By this bypass passage 16, low temperature clean water can be supplied to the heat utilization circuit 12, and conversely, hot water can be returned from the heat utilization circuit 12 to the hot water storage tank 2.

  The hot water supply passage 7 supplies hot water stored in the hot water storage tank 2 to a desired hot water supply destination such as a bath, and includes an upstream hot water supply passage portion 7a through which high-temperature hot water flows and a downstream hot water supply passage portion 7b through which mixed hot water flows. The upstream end is connected to the upper part of the hot water storage tank 2, and the downstream end is connected to the hot water tap. A mixing valve 7c is installed between the upstream hot water supply passage 7a and the downstream hot water supply passage 7b, and a bypass passage 17 branched from the upstream water supply passage 6a is connected to the mixing valve 7c. A check valve 17 a is installed in the bypass passage portion 17.

  A bypass passage portion 18 is connected from the bypass passage portion 17 directly to the downstream hot water supply passage portion 7b without passing through the mixing valve 7c, and a high temperature avoidance electromagnetic valve 18a is installed in the bypass passage portion 18. By this bypass passage 18, low-temperature clean water can be directly supplied from the clean water source to the downstream hot water supply passage 7 b. In the middle of the downstream hot water supply passage 7b, a hot water proportional valve 19a is installed, and a bath hot water passage 19 connected to the bath hot water supply circuit 9 is branched from the downstream side of the hot water proportional valve 19a. A pouring solenoid valve 19b, a check valve 19c, and the like are integrally installed in the bath outlet passage 19 in order.

Next, the bath hot water supply circuit 9 and the hot water heating circuit 11 will be described.
As shown in FIG. 1, the bath hot water supply circuit 9 is a circuit for scooping hot water in the bath, and has a bath return passage portion 9a and a bath return passage portion 9b. An internal passage portion 4b of the first heat exchanger 4 is connected between the bath return passage portion 9a and the bath return passage portion 9b, and a bath circulation pump 9c is installed in the bath return passage portion 9a.

  The hot water heating circuit 11 is a circuit that circulates heating water supplied to a hot water heating terminal such as a floor heating panel or a bathroom dryer. have. An expansion tank 11d and a heating circulation pump 11e are installed in the heating return passage portion 11a. A heat exchange passage portion 5b of the second heat exchanger 5 is interposed in the heating high temperature going passage portion 11b.

Next, the heat utilization circulation circuit 12 will be described.
The heat utilization circulation circuit 12 is a closed circuit that circulates hot and cold water and exchanges heat with the hot water heating circuit 11 and the bath hot water supply circuit 9. Corresponding to a supply water channel), a heat exchanger forward passage portion 12c, and a hot water return passage portion 12d.

  The upstream end of the hot water going-out passage portion 12a is connected to the upper part of the hot water storage tank 2, and the junction between the downstream end of the hot-water going-up passage portion 12a, the upstream end of the auxiliary heat source unit going-out passage portion 12b, and the downstream end of the hot water return passage portion 12d. Is provided with a three-way valve 12e. A check valve 12f is installed in the hot water going-out passage portion 12a, and a pressurizing pump 20 and a flow rate sensor 12g for sending hot water to the latent heat recovery heat exchanger 3d are installed in the auxiliary heat source device going-out passage portion 12b. ing.

  A latent heat recovery heat exchanger 3d and a sensible heat recovery heat exchanger 3c of the auxiliary heat source unit 3 are connected between the auxiliary heat source unit forward passage 12b and the heat exchanger forward passage 12c. Between the pair of branch passages in the downstream portion of the heat exchanger forward passage portion 12c and the pair of branch passages in the upstream portion of the hot water return passage portion 12d, the first and second heat exchangers 4 and 5 The heat exchange passages 4a and 5a are connected to each other. A bath heat exchange outlet solenoid valve 12h and a heating heat exchange outlet solenoid valve 12i are respectively installed in a pair of branch passages of the hot water return passage portion 12d.

  A hot water passage portion 12j connected to the hot water supply passage 7 is branched from the heat exchanger forward passage portion 12c, and a tank water proportional valve 12k is installed in the hot water passage portion 12j. The hot water having a lowered temperature in the hot water storage tank 2 or the low-temperature water introduced from the water supply passage 6 through the bypass passage portion 16 is heated by the auxiliary heat source unit 3 by the hot water passage portion 12j to obtain hot hot water. The hot water supply passage 7 can be supplied.

Next, a specific structure of the auxiliary heat source unit forward passage portion 12b according to the present invention will be described.
As shown in FIGS. 2 to 4, the auxiliary heat source unit forward passage portion 12 b has a pipe portion 21 extending from the pressurizing pump 20 to the latent heat recovery heat exchanger 3 d. A part of the pipe part 21 is constituted by a pipe expansion part 22 whose inner diameter is larger than the inner diameters of the other pipe parts 21.

  That is, the pipe portion 21 of the auxiliary heat source unit forward passage portion 12b is connected to the upstream small-diameter pipe portion 21a connected to the connection portion 20a of the pressurizing pump 20, and to the downstream end portion of the upstream small-diameter pipe portion 21a. Part 22 and a downstream small-diameter pipe part 21b connected to the downstream end part of the pipe expansion part 22 and connected to the latent heat recovery heat exchanger 3d.

  The inner diameter R of the pipe constituting the expanded pipe part 22 is configured to be larger than the inner diameter r of the pipe constituting the upstream side and downstream side small diameter pipe part 21b. For example, the expanded tube portion 22 is constituted by a pipe having an inner diameter of 20 mm (outer diameter 22.0 mm), and the upstream and downstream small-diameter pipe portions 21a and 21b are formed by a pipe having an inner diameter of 11.5 mm (outer diameter 12.7 mm). It is composed.

  As shown in FIGS. 2 to 4, at least one bent portion 22 a is provided in the pipe expansion portion 22. That is, an intermediate portion of the pipe constituting the expanded pipe portion 22 is bent, and the angle of the bent portion 22a is set to be a right angle, but it is not particularly limited to this angle.

  The circumferences of the pipes constituting the upstream and downstream small-diameter pipe portions 21a and 21b and the expanded pipe portion 22 are covered with a heat insulating material 23 to prevent heat dissipation from flowing hot water (see FIG. 2). In the middle of the upstream small-diameter pipe portion 21a, a drain plug 12l capable of discharging hot water is provided outside the hot water apparatus 1. A flow rate sensor 12g is installed in the middle of the downstream side small diameter pipe portion 21b.

Next, a pair of joint members 24 that connect the expanded pipe portion 22 and the upstream and downstream small-diameter pipe portions 21a and 21b will be described.
As shown in FIG. 5, both end portions of the tube expansion portion 22 are connected to the downstream end portion of the upstream small diameter tube portion 21 a and the upstream end portion of the downstream small diameter tube portion 21 b via the joint member 24, respectively. These joint members 24 are each formed in a substantially cylindrical shape made of metal (for example, brass), and are configured to be able to connect pipes having different outer diameters. Since the pair of joint members 24 have the same structure, the upstream joint member 24 will be described below.

  Inside the joint member 24, in order from the upstream side toward the downstream side, a small diameter mounting hole 24a having substantially the same outer diameter as the small diameter pipe portions 21a, 21b, and a small diameter pipe communicating with the end of the small diameter mounting hole 24a. A cylindrical hole 24b having substantially the same inner diameter as the portions 21a and 21b, a tapered hole 24c that communicates with the end of the cylindrical hole 24b and increases in diameter toward the downstream side, communicates with an end of the tapered hole 24c and expands the tube portion 22 And a large-diameter mounting hole 24d having substantially the same outer diameter.

  When connecting the expanded pipe portion 22 and the downstream end portion of the upstream small diameter pipe portion 21a via the joint member 24, the downstream end portion of the upstream small diameter tube portion 21a is inserted into the small diameter mounting hole 24a of the joint member 24, By fitting the upstream end portion of the expanded pipe portion 22 into the large diameter mounting hole 24d and joining the gap between the joint member 24 and the small diameter pipe portion 21a and the gap between the joint member 24 and the expanded pipe portion 22 by brazing, respectively, The small diameter pipe portion 21 a and the pipe expansion portion 22 are connected via the member 24. The connection between the expanded pipe part 22 and the upstream end of the downstream small diameter pipe part 21b is the same.

Next, the orifice pipe member 25 will be described.
As shown in FIGS. 2 to 4, in order to increase the water pressure of hot water discharged from the pressurization pump 20 between the pressurization pump 20 and the expanded pipe portion 22 in the pipe portion 21 of the auxiliary heat source unit forward passage section 12 b. An orifice pipe member 25 having an orifice portion 26 is provided.

  As shown in FIG. 6, the orifice tube member 25 is formed in a substantially cylindrical shape made of metal (for example, brass), and is integrally formed with a discharge port of the pressure pump 20 and an upstream small-diameter tube portion. It is configured to be connectable to the upstream end of 21a.

  The orifice pipe member 25 includes a small-diameter cylindrical portion 25a to which the connecting portion 20a of the pressurizing pump 20 is fitted, an annular protrusion 25b formed at the end of the small-diameter cylindrical portion 25a, and an end of the annular protrusion 25b. The large-diameter cylindrical portion 25c extending toward the downstream side is integrally formed. An annular groove 25d is formed in the outer peripheral portion of the small-diameter cylindrical portion 25a, and a synthetic resin O-ring 27 is attached to the annular groove 25d.

  On the inner peripheral side of the orifice pipe member 25, the orifice part 26 and the upstream end part of the upstream small-diameter pipe part 21a are accommodated from the upstream side toward the downstream side. A hole 25e is formed. The orifice portion 26 has an annular tapered hole 26a inclined so as to move toward the axial center toward the downstream side, a cylindrical hole 26b connected to an end portion of the annular tapered hole 26a, and an annular portion connected to an end portion of the cylindrical hole 26b. It is formed by an annular tapered hole 26c gently inclined in the opposite direction to the tapered hole 26a.

  When connecting the pressurizing pump 20 and the upstream end of the upstream small-diameter pipe portion 21a via the orifice pipe member 25, the small-diameter cylindrical portion 25a of the orifice pipe member 25 is connected to the connecting portion 20a of the pressurizing pump 20. Until the annular projection 25b contacts the distal end flange 20b of the connecting portion 20a, and the upstream end of the upstream small-diameter pipe portion 21a is fitted into the accommodation hole 25e of the orifice tube member 25, and the annular projection 25b and the distal end are fitted. A fixing member 28 (so-called quick fastener) is attached so as to sandwich the flange portion 20b, and the gap between the orifice pipe member 25 and the upstream small-diameter pipe portion 21a is joined by brazing so that the orifice pipe member 25 is interposed. Then, the pressurizing pump 20 and the upstream side small diameter pipe portion 21a are connected.

Next, the operation and effect of the hot water device 1 will be described.
In the heat utilization circulation circuit 12, hot water is sent from the auxiliary heat source unit forward passage section 12 b to the auxiliary heat source unit 3 through the drive of the pressurizing pump 20, reheated as necessary, and hot water passing through the auxiliary heat source unit 3. Is sent to the first and second heat exchangers 4 and 5 through the heat exchanger forward passage portion 12c, and the hot water exchanged in the first and second heat exchangers 4 and 5 is the hot water return passage. A circulating flow is formed that returns to the auxiliary heat source unit forward passage section 12b through the section 12d.

  At this time, when the pressurizing pump 20 is driven in the auxiliary heat source unit forward passage section 12b, the hot water discharged from the connecting section 20a of the pressurizing pump 20 is increased in water pressure when passing through the orifice section 26. At the same time, the vibration energy caused by the pressurizing pump 20 is attenuated and flows into the expanded pipe portion 22 via the upstream side small diameter pipe portion 21a. The hot water that has flowed into the expanded pipe portion 22 is attenuated in vibration energy due to a decrease in the flow velocity and a decrease in the water pressure of the hot water. The hot water sent out from the expanded pipe part 22 is sent into the latent heat recovery heat exchanger 3d via the downstream small diameter pipe part 21b.

  As described above, the auxiliary heat source unit forward passage portion 12b (supply water passage) has the piping portion 21 from the pressurizing pump 20 to the latent heat recovery heat exchanger 3d, and a portion of the piping portion 21 is the other portion. Since the pipe portion 21 (small-diameter pipe portions 21a and 21b) is constituted by the expanded pipe portion 22 whose inner diameter is larger than the inner diameter, the flow rate of the hot water discharged from the pressurizing pump 20 by the expanded pipe portion 22 having an enlarged inner diameter. Can be reduced, and the water pressure of hot water can be reduced.

  Therefore, by reducing the flow rate of the hot water discharged from the pressurizing pump 20 and reducing the water pressure by the pipe expansion part 22, the vibration energy of the vibration transmitted from the pressurizing pump 20 to the hot water can be attenuated. The vibration propagated from the pressure pump 20 to the hot water can be prevented from leaking to the outside via the latent heat recovery heat exchanger 3d as much as possible. Therefore, the vibration noise caused by the pressure pump 20 can be easily suppressed. And it can be realized at low cost.

  Moreover, since the orifice part 26 is provided between the pressurization pump 20 and the pipe expansion part 22 in the piping part 21, the vibration of the hot water discharged from the pressurization pump 20 can be attenuated by the orifice part 26. The damping effect of vibration energy is further improved, and the effect of suppressing vibration noise caused by the pressurizing pump 20 is improved.

  Further, since at least one bent portion 22a is provided in the pipe expanding portion 22, the vibration energy attenuation effect is further improved by changing the flowing direction of the hot water by the bent portion 22a, and the vibration noise caused by the pressurizing pump 20 is suppressed. The effect is further improved.

Next, a mode in which the above embodiment is partially changed will be described.
[1] In the above-described embodiment, the exhaust heat recovery heat exchanger of the fuel cell power generation device has been described as the external heat source device. However, the present invention is not limited to this, and a heat pump heating device, a gas engine, or the like may be adopted. In addition to these, various known ones can be employed.

[2] In the above-described embodiment, the structure in which the bent portion 22 is provided with one bent portion 22a has been described. However, the bent portion 22a is not particularly limited to one, and a plurality of bent portions 22a are provided. It may be a structured.

[3] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Hot water apparatus 3 Auxiliary heat source machine 3d Heat exchanger 12 for latent heat collection | recovery 12 Heat utilization circulation circuit 12b Auxiliary heat source machine going path part 20 Pressure pump 21 Pipe part 22 Expanded part 22a Bending part 26 Orifice part

Claims (3)

In a hot water apparatus comprising a latent heat recovery type heat exchanger, a supply water channel connected to the heat exchanger, and a pressure pump installed in the supply water channel and for sending hot water to the heat exchanger,
The supply water channel has a piping portion from the pressure pump to the heat exchanger,
A part of said piping part was comprised by the expanded pipe part by which the internal diameter was expanded rather than the internal diameter of another piping part, The hot water apparatus characterized by the above-mentioned.   The hot water device according to claim 1, wherein an orifice portion is provided between the pressurizing pump and the expansion portion in the pipe portion. The hot water device according to claim 1, wherein at least one bent portion is provided in the expanded pipe portion.