JPH08285296A - Heat source equipment - Google Patents

Abstract

PURPOSE: To provide heat source equipment which restricts the generation of noise caused by a water flow in a bypass line. CONSTITUTION: This heat source equipment is provided with a heat exchanger, a hot water feed pipe 7 which supplies hot water heated in the heat exchanger, a hot water return pipe 8 which sends hot water heat exchanged in other equipment to the heat exchanger, and a bypass pipe 20 which extends over the hot water feed pipe 7 and the hot water return pipe 8 and circulates partially or wholly the hot water to be supplied to the other equipment through the hot water return pipe 8. On the way of the bypass pipe 20, there is installed an expansion section 20c having an inside diameter larger than those of an inlet part 20a and an outlet part 20c installed on both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source machine, and more particularly to a heat source machine in which hot water is circulated to a heating device such as a radiator.

[0002]

2. Description of the Related Art Conventionally, as this type of heat source machine, a heat source machine having a structure shown in FIG. 4 has been known. The heat source device indicated by reference numeral 1 in FIG. 4 is configured to circulate hot water between a heat radiator 2 installed in a room or the like to heat the room or the like, and a box-shaped case 3 A heat exchanger 4 installed in the case 3 and provided with 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; An exhaust fan 6 provided in the middle of 5 and the heat exchanger 4 and the radiator 2 communicate with each other, and a hot water outflow pipe 7 for supplying the hot water generated in the heat exchanger 4 to the radiator 2. A hot water return pipe 8 for circulating hot water that has finished heat exchange in the radiator 2 to the heat exchanger 4, and a volume change due to a temperature change of the hot water which is provided in the hot water return pipe 8 and is circulated. Absorbs air bubbles and separates bubbles in warm water A circulation pump 10 arranged 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 to circulate the hot water, and in the middle of the hot water outflow pipe 7. A bypass pipe 11 that connects the hot water return pipe 8 and the upstream side of the expansion tank 9 is provided.

In the conventional heat source unit 1 having such a structure, the hot water produced in the heat exchanger 4 is supplied from the heat exchanger 4 to the radiator 2 as the circulation pump 10 is operated. Hot water that has been subjected to 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
A part of the hot water sent out from the heat exchanger 4 is made to flow into the hot water return pipe 8 via the bypass pipe 11.

[0004]

By the way, in the above-mentioned conventional heat source device 1, since the generated hot water is heated to a high temperature suitable for heating, bubbles are likely to be generated in the hot water. When hot water containing air bubbles flows into the bypass pipe 11, water flow noise is generated by the air bubbles, which causes noise.

When the amount of hot water supplied to the radiator 2 is reduced to lower the heating temperature, for example, the amount of hot water flowing into the bypass pipe 11 increases.
The above-mentioned problems become more prominent.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a heat source device in which generation of water flow noise in the bypass pipe is suppressed.

[0007]

The heat source machine according to claim 1 of the present invention has a heat exchanger and hot water heated in the heat exchanger to other equipment in order to achieve the above-mentioned object. A hot water outflow pipe to be supplied, a hot water return pipe for sending hot water that has undergone heat exchange in the other device to the heat exchanger, a hot water return pipe provided so as to straddle the hot water outflow pipe and the hot water return pipe, and to the other device. A bypass pipe for circulating a part or all of the hot water supplied to the hot water return pipe is provided, and an inner diameter larger than the inner diameters of the inflow part and the outflow part provided at both ends of the bypass pipe is provided. It is characterized in that an enlargement portion having is provided.

A heat source machine according to a second aspect of the present invention is the heat source machine according to the first aspect, wherein the continuous portion of the inflow portion and the enlarged portion and the continuous portion of the outflow portion and the enlarged portion have these axes. It is characterized in that they are provided so as to be displaced in a direction orthogonal to each other.

The heat source machine according to claim 3 of the present invention is the heat source machine according to claim 1 or 2, wherein the inflow part and the outflow part are an axial line at an upstream end of the inflow part and an outflow part. The axis line at the downstream end of the is curved so as to intersect with the axis line of the enlarged portion.

Further, a heat source machine according to a fourth aspect of the present invention is the heat source machine according to the first aspect, wherein the enlarged portion has curved portions formed at both ends thereof, and the curved portion is formed through these curved portions. The inflow section and the outflow section are connected.

[0011]

According to the heat source unit of the first aspect of the present invention, when the hot water containing the bubbles flows into the bypass pipe, the hot water reaches the enlarged portion with the large inner diameter from the inlet portion with the small inner diameter. Be slowed down. With such deceleration of hot water,
The bubbles stick to each other and grow, so that the frequency of collision between the bubbles is reduced and the water flow noise is reduced.

According to the heat source machine of the second aspect of the present invention, the hot water flowing from the inflow part to the expanding part moves to the downstream side in the expanding part and then changes its flow direction to flow into the outflow part. To do. Along with this, the flow direction of the bubbles in the warm water is also changed, and when the flow direction is changed, the kinetic energy of the bubbles is consumed and the water flow noise is reduced.

Further, according to the heat source machine of the third aspect of the present invention, since the inflow part and the outflow part are curved, the hot water flowing into the bypass pipe flows along the curve of the inflow part. At this time, the bubbles in the warm water are gathered to the vicinity of the inner surface on the outer side of the bypass pipe due to its inertia, and are further made to flow into the enlarged portion in a gathered state. Thereby, the growth of bubbles is promoted and the effect of suppressing water flow noise is improved.

Further, according to the heat source machine of the fourth aspect of the present invention, the hot water and the bubbles flow linearly from the inflow part to the expansion part, and the deceleration action of the hot water in the expansion part, and
Bubble growth due to the collective action of bubbles by changing the flow direction and energy consumption by changing the flow direction of the bubbles are simultaneously performed. Therefore, the effect of suppressing water flow noise is further enhanced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In the following description, the main constituent members of the heat source device are the same as those of the conventional heat source device shown in FIG.

In FIG. 1, reference numeral 20 indicates a bypass pipe used in the heat source device 1 of this embodiment.
0 has an inflow part 20a and an outflow part 20b that are curved and formed in a substantially L shape, and these inflow part 20a and outflow part 20b are connected to these inflow part 20a and outflow part 2 respectively.
The connection is made by the enlarged portion 20c having an inner diameter that is about 2 to 3 times larger than the inner diameter of 0b.

The inflow portion 20a and the outflow portion 20b are
A nut 21 which is connected to the hot water outflow pipe 7 and the hot water return pipe 8 is rotatably attached to one end of the inflow part 20a and the outflow part 20b. By the engagement with the annular projection 22 that is
It is adapted to be locked at a predetermined position in the axial direction, and the other end is fitted into the narrowed portion 20d formed at both ends of the enlarged portion 20c and is integrated by brazing or the like. ing.

Bypass pipe 20 having such a structure
Through the nuts 21 attached to the inflow part 20a and the outflow part 20b, respectively.
In the state where they are communicated with each other, they are mounted horizontally, for example.

The warm water flowing into the bypass pipe 20 is moved along the curved flow path formed by the inflow portion 20a and then flown into the enlarged portion 20c.
After passing through the enlarged portion 20c, it is moved along the curved flow path formed by the outflow portion 20b and discharged to the warm water return pipe 8.

Here, when the temperature of the hot water rises and bubbles are generated inside the hot water, the bubbles can be moved in the bypass pipe 20 together with the hot water. However, due to its inertia, the inflow part 2
After being moved to the inner wall side radially outward of the curve of 0a, it is made to flow into the enlarged portion 20c.

Due to such movement of the bubbles, the bubbles in the warm water are moved in a state of being gathered in the vicinity of the pipe wall of the inflow portion 20a, whereby the movement range of the fine bubbles is limited, Behaviors such as collision and separation of bubbles are suppressed, and bubbles are held in contact with each other to promote the coalescence action of these bubbles. Due to their synergistic effect, noise caused by collision of fine bubbles is generated. Is suppressed.

On the other hand, the bubbles flowing into the enlarged portion 20c are decelerated in the moving speed as the flow velocity of the warm water in the enlarged portion 20c is reduced, whereby the coalescence action of the bubbles is further promoted.

Then, the bubbles are caused to flow into the warm water return pipe 8 through the outflow portion 20b, but the bubbles are expanded.
Since it is sufficiently grown while passing through c, the noise generated by the bubbles moving in the outflow portion 20b is suppressed to be small.

Here, when the conventional bypass pipe 11 and the bypass pipe 20 used in the present embodiment are supplied with hot water of the same flow rate and the same temperature, the noise amount thereof is measured. The result is as follows.

Conventional example: 70 decibels Present example: 60 decibels As is clear from these results, in the heat source machine including the bypass pipe 20 shown in the present example, good water flow noise suppressing action can be obtained. .

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,
Enlarged portion 30c connecting the inflow portion 30a and the outflow portion 30b
Has been slightly modified.

That is, in the enlarged portion 30c, a pair of throttle portions 30d, which are connecting portions of 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. It is configured to be installed at a different position. Therefore, the axes of the inflow portion 30a and the outflow portion 30b connected to the throttle portions 30d are also displaced from each other in the direction orthogonal to the axis.

In the bypass pipe 30 having such a structure, the behavior of bubbles from the inflow portion 30a to the inflow portion 30c is almost the same as that of the first embodiment, but the inflow portion 30c to the outflow portion is the same. These behaviors are different when flowing into 30b.

That is, from the inflow portion 30a to the enlarged portion 30c
The bubbles that have flowed into the first portion are moved along one wall surface of the enlarged portion 30c, but in the vicinity of the downstream end portion of the enlarged portion 30c, the flow direction thereof is toward the connection portion with the outlet portion 30b. Can be changed to. Then, when the flow direction of the bubbles is changed, the kinetic energy of the bubbles is consumed, and as a result, the sound of water flow accompanying the movement of the bubbles is further effectively suppressed. Further, FIG. 3 shows a bypass pipe used in the third embodiment of the present invention.

The bypass pipe indicated by reference numeral 40 in FIG. 4 is an inflow part 40a forming a linear flow path, an outflow part 40b also forming a linear flow path, and an inflow part 40a and an outflow part 40b thereof. And an enlarging portion 40c that communicates with the enlarging portion 40c. The enlarging portion 40c has, at both ends thereof, a curve 40e that is bent by approximately 90 degrees in the same direction. A narrowed portion 40d that connects the portion 40a and the outflow portion 40b is formed.

In the bypass pipe 40 thus constructed, the warm water and the air bubbles flowing into the bypass pipe 40 are
By flowing into the enlarged portion 40c, the flow velocity is reduced, and then the flow direction is changed by the curved portion 40e provided on the upstream side of the enlarged portion 40c.
After being moved to the downstream side of the enlarged portion 40c, the flow direction is further changed along the curved portion 40e on the downstream side and is sent to the hot water return pipe 8 through the outflow portion 40b.

Therefore, the decelerating action of the enlarged portion 40c alleviates the impact of collision between small bubbles, promotes good contact between these bubbles, and promotes the growth of the bubbles. The growth action of the bubbles is further promoted by the aggregation action of the bubbles due to the change of the flow direction by 40e, and the kinetic energy of the bubbles is further attenuated due to the change of the flow direction. It will be reduced.

Further, by forming the curved portion in the enlarged portion 40c, the route of the enlarged portion 40c can be lengthened and the route of the inflow portion 40a and the outflow portion 40b can be shortened by that amount. The growth section of bubbles is formed long and the section where water flow noise is easily generated is shortened. From this point as well, improvement of the water flow noise reduction effect is expected.

The shapes and dimensions of the bypass pipe shown in each of the above-described embodiments are merely examples, and the types of other constituent members of the heat source machine to be applied, the relation with them, the design requirements, etc. It is possible to change variously based on.

For example, in order to promote the growth of the bubbles, a net for trapping the bubbles is provided in the enlarged portions 20c, 30c, 40c, or an uneven surface is formed on the inner surface of the bypass pipe. It is also possible to capture the bubbles by the unevenness.

The bypass pipe can be installed not only in a horizontal state but also in a vertical state or an inclined state. When the installation form is changed in this way, it is assumed that the movement of the bubble in the bypass pipe is different due to the influence of the buoyancy acting on the bubble, and thus the difference in the water flow noise reduction effect in each form occurs. .

[0037]

As described above, according to the first aspect of the present invention.
According to the heat source device of the present invention, by providing an enlarged portion having an inner diameter larger than the inner diameters of the inflow portion and the outflow portion in the middle of the bypass pipe, the flow velocity of the warm water is reduced and the heat water is contained in the warm water. It is possible to effectively realize the contact between fine air bubbles and to promote the growth of the air bubbles, thereby reducing the sound of water flow due to the collision and separation of the fine air bubbles.

According to the heat source machine of claim 2 of the present invention, the streamline of the hot water flowing into the expanding portion and the streamline of the hot water discharged from the expanding portion are displaced in a direction orthogonal to the flow direction. Thus, it is possible to forcibly change the flow of bubbles, thereby attenuating the kinetic energy of the bubbles, and suppressing the generation of water flow noise due to the bubbles.

Further, according to the heat source machine of the third aspect of the present invention, the flow of the hot water flowing into the expanding portion is changed at the inflow portion, so that the bubbles contained in the hot water are changed to the stream line of the hot water. It is possible to promote the coalescence of these bubbles, that is, the growth of the bubbles, by gathering the bubbles on one side and allowing the bubbles to flow into the enlarged portion in the gathered state. As a result, it can be expected that the effect of suppressing the sound of water flow generated by the bubbles is improved.

Further, according to the heat source machine of claim 4 of the present invention, the velocity of the hot water flowing into the bypass pipe is reduced at the expanding portion, and the hot water is caused by the curved portions formed at both ends of the inflowing portion. By concentrating the bubbles contained in the side of the flow direction, the range of movement of the fine bubbles is limited to promote the growth of the bubbles, and the flow direction of the bubbles is changed to change the kinetic energy of the bubbles. Can be attenuated. Therefore, due to these synergistic effects,
It is possible to suppress water flow noise in the bypass pipe. Moreover, by connecting the curved portion to both ends of the enlarged portion,
The enlarged portion can be lengthened and the bubble growth section can be lengthened to further promote bubble growth.

[Brief description of 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 cross-sectional view showing a bypass pipe used in a third embodiment of the present invention.

FIG. 4 is a schematic view showing a structural example of a general heat source machine.

[Explanation of symbols] 1 heat source device 2 radiator 4 heat exchanger 7 hot water outflow pipe 8 hot water return pipe 20/30/40 bypass pipe 20a / 30a / 40a inflow part 20b / 30b / 40b outflow part 20c / 30c / 40c enlargement Part 20d, 30d, 40d Drawing part 40e Curved part

Front page continuation (72) Inventor Koji Minamikata 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A heat exchanger, a hot water outflow pipe for supplying hot water heated in the heat exchanger to another device, and a hot water return for sending hot water heat-exchanged in the other device to the heat exchanger. A pipe, a bypass pipe that is provided so as to straddle the hot water return pipe and the hot water return pipe, and circulates a part or all of the hot water supplied to the other device to the hot water return pipe, A heat source machine, characterized in that, in the middle of the bypass pipe, enlarged portions having inner diameters larger than the inner diameters of the inflow portion and the outflow portion provided at both ends thereof are provided. 2. The continuous portion of the inflow portion and the enlarged portion and the continuous portion of the outflow portion and the enlarged portion are provided so as to be offset from each other in a direction orthogonal to these axis lines. Item 1. A heat source machine according to item 1. 3. The inflow section and the outflow section are curved so that an axis line at an upstream end of the inflow section and an axis line at a downstream end of the outflow section intersect with an axis line of the expansion section. The heat source machine according to claim 1, wherein the heat source machine is provided. 4. The enlarged portion has curved portions formed at both ends thereof, and the inflow portion and the outflow portion are connected via these curved portions. Heat source machine described in.