JP3540426B2 - Heat source machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a heat source device, and more particularly to a heat source device that circulates hot water to a heating device such as a radiator.
[0002]
[Prior art]
Conventionally, a heat source device having a structure shown in FIG. 3 is known as this type of heat source device.
The heat source unit denoted by reference numeral 1 in FIG. 3 is configured to circulate warm water between a radiator 2 installed in a room or the like to heat the room or the like. A heat exchanger 4 provided in the case 3 and having a burner set 4a for generating hot water; an exhaust duct 5 for communicating the heat exchanger 4 with the outside of the case 3; 5, an exhaust fan 6 provided in the middle of the pipe 5, a hot water pipe 7 for communicating the heat exchanger 4 with the radiator 2, and supplying hot water generated in the heat exchanger 4 to the radiator 2; A hot water return pipe 8 for circulating the hot water having undergone heat exchange in the radiator 2 to the heat exchanger 4, and a volume change due to a temperature change of the circulated hot water provided in the middle of the hot water return pipe 8; Absorbs air and separates bubbles in warm water. A circulating pump 10 that is disposed between the expansion tank 9 and the heat exchanger 4 in the middle of the expansion tank 9 and the hot water return pipe 8 and circulates the hot water; And a bypass pipe 11 for communicating the hot water return pipe 8 with the upstream side of the expansion tank 9.
[0003]
In the conventional heat source unit 1 configured as described above, the hot water generated in the heat exchanger 4 is supplied from the heat exchanger 4 to the radiator 2 with the operation of the circulation pump 10 to be heated. The hot water that has been supplied and that has completed heat exchange in the radiator 2 is circulated to the heat exchanger 4 via the hot water return pipe 8 and the expansion tank 9, and further, a part of the hot water sent out from the heat exchanger 4. Is allowed to flow into the hot water return pipe 8 via the bypass pipe 11.
[0004]
[Problems to be solved by the invention]
By the way, in the above-described conventional heat source device 1, since the generated hot water is set at a high temperature so as to be suitable for heating, air bubbles are easily generated in the hot water, and the hot water containing the air bubbles is supplied to the bypass pipe. When the air flows into the space 11, water bubbles are generated by the above-mentioned air bubbles, which causes noise.
[0005]
Then, for example, when the amount of hot water supplied to the radiator 2 is reduced to lower the heating temperature, the amount of hot water flowing into the bypass pipe 11 increases, so that the above-described problem becomes more remarkable.
[0006]
The present invention has been made in view of the above-described conventional problems, and has as its object to provide a heat source device in which generation of water flow noise in a bypass pipe is suppressed.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a heat source device according to claim 1 of the present invention includes a heat exchanger, a hot water supply pipe for supplying hot water heated in the heat exchanger to another device, A hot water return pipe that sends hot water heat exchanged in the device to the heat exchanger, and is provided so as to straddle the hot water going pipe and the hot water return pipe, and part or all of the hot water supplied to the other device. A bypass pipe that circulates the hot water into the hot water return pipe. The bypass pipe includes an inflow portion and an outflow portion each formed by a curved pipe, and the inflow portion is provided between the inflow portion and the outflow portion. And an enlarged portion made of a pipe having an inner diameter larger than the inner diameter of the outflow portion is connected, and the whole shape is curved .
[0011]
[Action]
According to the heat source device of the first aspect of the present invention, when hot water containing air bubbles flows into the bypass pipe, the speed of the hot water is reduced at the time when the hot water reaches the enlarged portion having the large inner diameter. . As the warm water decelerates, the bubbles adhere to each other and grow, so that the collision frequency of the bubbles decreases, and the water flow noise is reduced.
[0013]
Further, by the flow join the club and outlet portions are curved, flowing hot water that has flowed into the bypass pipe along the curvature of the inlet portion, this time, bubbles in said hot water due to its inertia, the outer bypass pipe Are gathered in the vicinity of the inner surface, and then flow into the enlarged portion in the gathered state. Thereby, the growth of bubbles is promoted, and the effect of suppressing water flow noise is improved.
[0015]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
In the following description, the main constituent members of the heat source unit are the same as those of the conventional heat source unit shown in FIG. 3 , and therefore, the common parts are denoted by the same reference numerals and the description is simplified.
[0016]
In FIG. 1, reference numeral 20 denotes a bypass pipe used in the heat source device 1 of the present embodiment. The bypass pipe 20 includes an inflow portion 20a and an outflow portion 20b which are formed in a substantially L-shape. The inflow portion 20a and the outflow portion 20b are connected by an enlarged portion 20c having an inner diameter that is approximately two to three times larger than the inner diameter of the inflow portion 20a and the outflow portion 20b.
[0017]
At one end of the inflow portion 20a and the outflow portion 20b, a nut 21 for connection with the hot water outgoing pipe 7 and the hot water return pipe 8 is rotatably mounted. The engagement with the annular projection 22 formed on the outer periphery of one end of the portion 20b is stopped at a predetermined position in the axial direction, and the other end is formed at both ends of the enlarged portion 20c. And is integrated by brazing or the like.
[0018]
The bypass pipe 20 having such a configuration is connected to the hot water return pipe 7 and the hot water return pipe 8 via the nut 21 attached to the inflow portion 20a and the outflow portion 20b, in a state where these are communicated. , For example, mounted horizontally.
[0019]
Then, the hot water flowing into the bypass pipe 20 is moved along the curved flow path formed by the inflow portion 20a and then flows into the enlarged portion 20c. After passing through the enlarged portion 20c, the outflow portion 20b It is moved along the curved flow path formed by the above and discharged to the hot water return pipe 8.
[0020]
Here, when the temperature of the hot water rises and bubbles are generated inside the hot water, the bubbles are moved in the bypass pipe 20 together with the hot water. After being moved toward the inner wall side of the curved portion of the inflow portion 20a in the radial direction by inertia, it is made to flow into the enlarged portion 20c.
[0021]
Due to such movement of the bubbles, the bubbles in the warm water are moved in a state where they are gathered near the pipe wall of the inflow portion 20a, whereby the movement range of the fine bubbles is restricted, and Behavior such as collision / separation is suppressed, and the bubbles are kept in contact with each other, promoting the coalescence of these bubbles.The synergistic action of these suppresses the noise caused by the collision of fine bubbles. You.
[0022]
On the other hand, the moving speed of the bubbles flowing into the enlarged portion 20c is reduced as the flow rate of the hot water in the enlarged portion 20c is reduced, whereby the coalescing action of the bubbles is further promoted.
[0023]
The bubbles are caused to flow into the hot water return pipe 8 through the outflow portion 20b. However, since the bubbles are sufficiently grown while passing through the enlarged portion 20c, the bubbles are generated by the bubbles moving in the outflow portion 20b. The noise caused is reduced.
[0024]
Here, when the amount of noise was measured by flowing hot water of the same flow rate and the same temperature into each of the conventional bypass pipe 11 and the bypass pipe 20 used in the present embodiment, the following results were obtained. was gotten.
[0025]
Conventional example: 70 dB This embodiment: 60 dB As is clear from the results, in the heat source unit including the bypass pipe 20 shown in the present embodiment, a good water flow noise suppressing action can be obtained.
[0026]
FIG. 2 shows a bypass pipe used in the second embodiment of the present invention.
The bypass pipe indicated by reference numeral 30 in FIG. 2 has substantially the same components as those of the first embodiment, and a slight change is added to an enlarged portion 30c connecting the inflow portion 30a and the outflow portion 30b.
[0027]
That is, the enlarged portion 30c is located at a position where the pair of throttle portions 30d, which are the connecting portions between the inflow portion 30a and the outflow portion 30b formed at both ends thereof, are displaced in a direction orthogonal to the axis of the enlarged portion 30c. The configuration is provided.
Therefore, the axes of the inflow portion 30a and the outflow portion 30b connected to the throttle portion 30d are also shifted from each other in a direction orthogonal to the axes.
[0028]
In the bypass pipe 30 having such a configuration, the behavior of the bubbles from the inflow portion 30a to the enlargement portion 30c is substantially the same as that of the first embodiment, but the bubbles flow from the enlargement portion 30c to the outflow portion 30b. These behaviors are different.
[0029]
That is, the air bubbles flowing from the inflow portion 30a into the enlarged portion 30c are first moved along one wall surface of the enlarged portion 30c, and in the vicinity of the downstream end of the enlarged portion 30c, the flow direction is changed to the outflow direction. It is changed so as to go to the connection portion with the portion 30b.
Then, when the flow direction of the bubble is changed, the kinetic energy of the bubble is consumed, and as a result, the water flow noise caused by the movement of the bubble is more effectively suppressed.
[0034]
The various shapes, dimensions, etc. of the bypass pipes shown in each of the above embodiments are merely examples, and may vary based on the type of other components of the heat source unit to be applied, the relationship with these components, or design requirements. Can be changed.
[0035]
For example, in order to promote the growth of the bubble, it may be provided a net so as to capture air bubbles in the enlarged portion 20c · 30 in c, previously formed the uneven surface to the inner surface of the bypass pipe, the air bubbles by these irregularities It is also possible to capture.
[0036]
In addition, the installation form of the bypass pipe is not limited to the horizontal state, but can be installed in a vertical state or an inclined state.
When the installation mode is changed in this manner, it is assumed that the movement of the air bubbles in the bypass pipe is different due to the influence of the buoyancy acting on the air bubbles, thereby causing a difference in the water flow noise reduction effect in each mode. .
[0037]
【The invention's effect】
As described above, according to the heat source device of claim 1 of the present invention, the flow rate of the hot water is increased by providing the enlarged portion having an inner diameter larger than the inner diameter of the inflow portion or the outflow portion in the middle of the bypass pipe. To reduce the noise caused by the collision and departure of the fine bubbles by effectively realizing the contact between the fine bubbles contained in the warm water and promoting the growth of the bubbles. be able to.
[0039]
Also, by bending the inflow portion and the outflow portion , and changing the flow of the hot water flowing into the enlarged portion at the inflow portion, the bubbles contained in the hot water are collected at one side of the streamline of the hot water, By allowing the bubbles to flow into the enlarged portion in the aggregated state, the coalescence of these bubbles, that is, the growth of the bubbles, can be promoted. As a result, an improvement in the effect of suppressing the water flow noise generated by the bubbles can be expected.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a bypass pipe used in a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a bypass pipe used in a second embodiment of the present invention.
FIG. 3 is a schematic view showing a structural example of a general heat source device.
[Explanation of symbols]
Grain 1 heat source apparatus 2 radiator 4 heat exchanger 7 the hot water forward pipe 8 portion 20c-30 exits the hot water return pipe 20, 3 0 bypass pipe 20a, 30 a flow join the club 20b-30 b flow c expansion majority 20d, 30 d Ribe

Claims (1)

A heat exchanger, a hot water outlet pipe for supplying hot water heated in the heat exchanger to another device, a hot water return pipe for sending hot water heat exchanged in the other device to the heat exchanger, A bypass pipe that is provided so as to straddle the going pipe and the hot water return pipe, and that circulates a part or all of the hot water supplied to the other device to the hot water return pipe ; An inflow section and an outflow section each formed by a curved pipe are provided, and an enlarged section formed by a pipe having an inner diameter larger than the inner diameter of the inflow section and the outflow section is connected between the inflow section and the outflow section. A heat source device characterized by having an overall shape curved .

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