JP2008275282A - Composite heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite heat source machine capable of reserving heat by restraining heat radiation from an expansion tank itself and/or effectively using heat radiated from the other. <P>SOLUTION: In an external facing case 1, the expansion tank 4 being a component of a hot-water circulation-type heating circuit is oppositely adjacently arranged in an intermediate position between a hot water supply combustion heating part 2 and a heating combustion heating part 3. Upper sides of both combustion heating parts 2 and 3 are extended by a secondary heat exchanger 5 for recovering latent heat, and an upper part of the expansion tank is covered with the secondary heat exchanger. A heat reserving effect by heat radiated from the combustion heating parts is also obtained by cutting off even an upward heat radiation passage by avoiding a passage of suction outside air to air blowing fans 31a and 36a at lower sides of the respective combustion heating parts from air supply holes 12 and 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a composite heat source apparatus having two combustion heating units to realize a plurality of functions such as a hot water heating function and a hot water supply function, etc., and particularly an arrangement capable of suppressing heat radiation and improving thermal efficiency. Concerning structure.

  Conventionally, as a combined heat source machine, one having both a hot water supply function and a hot water heating function is known. As an arrangement structure of various components constituting such a composite heat source machine, a hot water supply heat exchanger and a heating heat exchanger are individually arranged at the left and right side positions in the outer case, and in particular, a small size in the width direction. In consideration of optimization and maintenance work, an expansion tank is disposed at the rear position of both heat exchangers, and an electrical case is disposed at the front position, and combustion air supply / exhaust is disposed at the upper position of both heat exchangers. It has been proposed to dispose a ventilation fan and a circulation pump or the like at a lower position (see, for example, Patent Document 1). In short, in this proposal, the expansion tank is arranged between the heat exchanger and the outer case.

JP-A-2-263046

  By the way, if the expansion tank for realizing the hot water heating function is arranged between the heat exchanger and the outer case, not only is heat dissipated wastefully, but also heat dissipation is promoted, resulting in a decrease in efficiency of the entire system. It will also invite you.

  That is, in the heating operation by the hot water heating function, when the load is low, control is performed so that the combustion heating unit is operated by alternating switching of ON / OFF combustion, so that it contributes to the heating output during OFF combustion (combustion stop). This will cause heat dissipation. At this time, the heat radiation from the expansion tank having the largest capacity and surface area is particularly significant even in the system that realizes the hot water heating function, which causes a decrease in efficiency.

  In addition, the heat dissipation from the expansion tank is promoted due to the arrangement structure of the expansion tank. For example, as shown in FIG. 1B, when the expansion tank 400 is disposed between the heating combustion heating unit 300 and the outer case 1, when the combustion operation is performed in the heating combustion heating unit 300, Although radiant heat is received from one side, the other side is in a state where it is easy to dissipate heat because it is in contact with the external space with the exterior case 1 interposed therebetween. In addition, when the blower fan 301, which is a supply source of combustion air, is activated, it flows into the exterior case from the side surface air supply holes 11, 11,... (See FIG. 3) of the front cover 1a that covers the front surface of the exterior case 1. As a result, the expansion tank 400 is directly exposed to the flow of the outside air, which promotes heat dissipation. And it will be exposed not only to the side but also to the outside air flowing in from the front. For example, as shown in FIG. 6, the outside air also flows from the front air supply holes 12, 12,... Of the front cover 1a by the operation of the blower fan 301, and the inflowed air is installed in order to prevent rainwater blowing or the like. Since the air flows over the plate 14 from above and is sucked into the blower fan 301 in the lower position, the inflowing outside air comes into contact with the expansion tank 400 when over the protection plate 14 to promote heat dissipation of the expansion tank. It will end up.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a composite heat source apparatus capable of suppressing heat dissipation from the expansion tank itself and / or effectively keeping heat by using radiant heat from others. Is to provide.

  In order to achieve the above object, in the present invention, a composite heat source comprising an exterior case, two combustion heating parts that can be burned independently of each other, and an expansion tank that temporarily stores fluid passing through one combustion heating part For the machine, the expansion tank is disposed in the outer case at a position sandwiched between the two combustion heating parts (Claim 1).

  In the case of the present invention, for example, as shown in FIG. 1 (a), if either one or both of the combustion heating sections 2 and 3 on both sides are combusting, the expansion tank 4 is in the combustion heating section 2 and / or Alternatively, the temperature is raised or at least kept by receiving radiant heat accompanying combustion from 3, while the both sides of the expansion tank 4 are shielded by the combustion heating units 2 and 3 even when not burning, so that the air flow from the outside It is protected from being exposed to (for example, a supply airflow of outside air as combustion air). This prevents the expansion tank 4 from being exposed to the flow of outside air and promotes heat dissipation from the expansion tank 4 to suppress the heat dissipation, and also radiates heat from the combustion heating units 2 and 3. It is possible to keep the expansion tank 4 warm by effectively utilizing the above. As a result, the efficiency of the composite heat source machine can be improved.

  In the present invention, it further comprises a heat exchanger for recovering latent heat from the two combustion heating parts and recovering latent heat from the combustion exhaust gas, and both left and right sides sandwiching the expansion tank between the two combustion heating parts On the other hand, the latent heat recovery heat exchanger can be arranged in a state of being stretched over the two combustion heating sections so as to cover the upper part of the expansion tank. ). By doing in this way, the upper part of an expansion tank is covered and the escape route of the heat radiation from an expansion tank upwards is interrupted | blocked. Thereby, the efficiency improvement by the heat dissipation suppression and heat dissipation suppression of an expansion tank can be increased further.

  In the present invention, a combustion air supply unit for supplying combustion air to the lower position of the combustion heating unit is attached, and outside air is supplied to the combustion case from the combustion case. An air supply hole may be formed, and the expansion tank may be disposed at a position that avoids the passage of outside air from the air supply hole to the combustion air supply unit. By doing so, it is reliably avoided that the expansion tank is exposed to the flow of outside air, and the heat radiation from the expansion tank is reliably suppressed.

  As described above, according to any one of claims 1 to 3, since both sides of the expansion tank are shielded by the combustion heating unit, they are protected from being exposed to the flow of outside air. Thus, it is possible to prevent heat dissipation by being exposed to the flow of outside air and suppress heat dissipation. In addition, the expansion tank can be kept warm by effectively using the radiant heat accompanying the combustion of the combustion heating section. As a result, it is possible to suppress and avoid wasteful heat radiation from the expansion tank and improve the efficiency of the composite heat source machine.

  In particular, according to the second aspect, the escape route for heat radiation upward from the expansion tank can be blocked by the latent heat recovery heat exchanger, thereby further increasing the efficiency improvement by suppressing the heat dissipation of the expansion tank and suppressing the heat dissipation. Can be made.

  According to the third aspect of the present invention, it is possible to reliably avoid the expansion tank being exposed to the flow of outside air, and to ensure the suppression of heat radiation from the expansion tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  2 and 3 show a composite heat source apparatus according to an embodiment of the present invention. In both figures, 1 is an exterior case, 1a is a front cover constituting a part of the exterior case, and 2 is a hot water supply function. Combustion heating unit for hot water supply, 3 is a heating combustion heating unit for realizing the hot water heating function, 4 is an expansion tank that is a component for realizing the hot water heating function, and 5 is a heat exchanger for latent heat recovery. It is a secondary heat exchanger. In the present invention, the greatest feature is that the expansion tank 4 is disposed between the hot water combustion heating unit 2 and the heating combustion heating unit 3. The existence of the industrial heat exchanger 5 is not an essential component.

  First, a specific operation principle applied as a composite heat source machine as shown in FIGS. 2 and 3 will be briefly described based on the example of FIG. Note that the composite heat source apparatus shown in FIG. 4 is configured in a composite type having both of a hot water supply function, a hot water circulation type hot water heating function, a bath replenishment function, and a bath hot water filling function. In this example, a latent heat recovery type that achieves higher efficiency by recovering latent heat from flue gas in addition to sensible heat is illustrated. However, in carrying out the present invention, at least the hot water heating function is independent of this. Any other combined heat source device may be used as long as it is combined with another function (for example, a hot water supply function) that involves the combustion operation.

  In FIG. 4, reference numeral 21 is a hot water supply circuit for realizing a hot water supply function, 22 is a heating circuit for realizing a hot water heating function, 23 is a reheating circuit for realizing a bath reheating function as a bath side circulation circuit, Reference numeral 24 denotes a pouring circuit for realizing a bath hot water filling function, and reference numeral 25 denotes a drain water processing circuit for processing the drain water generated in the secondary heat exchanger 5 for recovering latent heat so that it can be reused. , 26 is a controller for controlling the operation of each of these circuits. The reheating of the bath in this composite heat source machine is a type in which reheating is performed by raising the temperature of the bath water of the reheating circuit 23 by liquid-liquid heat exchange heating using the high-temperature water of the heating circuit 22 as a heat source. However, the present invention is not limited to this, and is configured to perform reheating with a combustion heating section for reheating heating (a combustion burner and a heat exchanger heated by heat of combustion of the combustion burner). May be.

  The hot water supply circuit 21 is supplied with combustion water for hot water supply 31 that burns by receiving supply of combustion air from a blower fan 31 a that is a combustion air supply unit provided at a lower position, and combustion heat of the combustion burner 31. A hot water supply primary heat exchanger 32 for heat exchange heating is provided as a hot water supply combustion heating section 2, and tap water and the like are mainly heated in the hot water supply primary heat exchanger 32 from the inlet 33 and heated. Is discharged to the hot water outlet 34. At this time, the incoming water from the incoming water passage 33 is passed through the hot water supply heat exchanging portion 5 a constituting a part of the secondary heat exchanger 5 before entering the primary heat exchanger 32. The hot water supply heat exchange section 5a of the secondary heat exchanger 5 is preheated by recovering the latent heat of the combustion exhaust gas and enters the primary heat exchanger 32 for main heating. Then, the hot water heated to a predetermined temperature and discharged into the hot water supply passage 34 is supplied to predetermined hot water supply locations such as a hot water tap 35 and the pouring circuit 24 in a kitchen or bathroom. In the illustrated example, only one hot water tap 35 is shown, but there are usually a plurality of hot water taps 35 disposed in the kitchen, washbasin, bathroom, and the like.

  The heating circuit 22 is circulated by the combustion burner 36 for heating that is supplied with combustion air from a blower fan 36a, which is a combustion air supply unit attached to the lower position, and burns by the combustion heat of the combustion burner 36. A heating primary heat exchanger 37 that heats and heats hot water is provided as the heating combustion heating unit 3, and a heating hot water circulation path 38 is passed through the heating primary heat exchanger 37.

  The hot water circulation path 38 sends the low temperature water returned to the expansion tank 4 and stored to the inlet of the heating primary heat exchanger 37 by the operation of the heating circulation pump 39, where it is heated by the combustion burner 36. Hot water is supplied as a heat source to a bath heater 41 that is a liquid-liquid heat exchanger, or is supplied to a high-temperature heating terminal 43 such as a bathroom dryer via a high-temperature forward header 42. Also, by the operation of the circulation pump 39, the low-temperature water in the expansion tank 4 is supplied to the low-temperature heating terminal 45 such as a floor heater via the low-temperature forward header 44, and heat is radiated from all the heating terminals 43 and 45. Thus, the low-temperature water that has become colder is circulated through the return header 46 through the heating header 5b of the secondary heat exchanger 5 for recovering latent heat and then returned to the expansion tank 4. ing. In the heating heat exchanging section 5b of the secondary heat exchanger 5, the low-temperature water is returned to the expansion tank 4 in a preheated state by the latent heat recovery from the combustion exhaust gas of the heating combustion burner 36.

  In the reheating circuit 23, a bath heater 41 as a liquid-liquid heat exchange type heating unit is interposed in a recirculation circulation path 47 composed of a return pipe 47a and a forward pipe 47b. Bath water taken out from B through the return pipe 47a is sent to the bath heater 41, where it is reheated by liquid-liquid heat exchange using high-temperature water on the heating circuit 22 side as a heat source. Hot water is sent to the bathtub B through the forward pipe 47b.

  The pouring circuit 24 includes a pouring passage 49 that has an upstream end branched from the hot water supply circuit 21 and a downstream end joined to the recirculation circuit 47, and a pouring solenoid valve that switches between running and shutting of pouring by opening and closing switching. 49a. The pouring electromagnetic valve 49a is controlled to open and close by the controller 26, and by pouring, the hot water in the outlet channel 34 is poured into the bathtub B through the pouring channel 49 and the circulation channel 47 (return pipe 47a), and reaches a predetermined amount. The hot water filling is performed.

  The drain water treatment circuit 25 is a drain produced by condensing the flue gas in the secondary heat exchanger 5 (heat exchange unit 5a for hot water supply and heat exchange unit 5b for heating) by cooling and condensing the exhaust gas for heat recovery for recovering latent heat. This is a circuit installed to drain water after draining the drained water after neutralizing it in the neutralizing tank 25a filled with the neutralizing material.

  Next, the arrangement structure of each component targeted by the present invention in the composite heat source machine as described above will be described in detail.

  The hot water supply combustion heating section 2 and the heating combustion heating section 3 are disposed at respective positions on the left and right sides of the outer case 1 from the middle to the upper side in the vertical direction. In the illustrated example, the hot water supply combustion heating unit 2 is disposed at the right side position and the heating combustion heating unit 3 is disposed at the left side position, but the reverse may be possible. An expansion tank 4 is disposed in a state sandwiched between both the combustion heating units 2 and 3 at an intermediate position in the left-right direction of the outer case 1. In particular, as shown in FIG. 5, the expansion tank 4 is located directly beside both combustion burners 31 and 36 (more precisely, combustion can bodies containing the combustion burners 31 and 36) of the respective combustion heating units 2 and 3. It is preferable that the expansion tank 4 is disposed at a position higher than the suction ports of the blower fans 31a and 36a. More specifically, the bottom of the expansion tank 4 is the combustion flame of the combustion burners 31 and 36. It is preferable that they are arranged so as to be opposed to each other in the lateral position or a slightly upper lateral position.

  A secondary heat exchanger 5 is placed between the hot water supply combustion heating unit 2 and the heating combustion heating unit 3 so as to cover the upper side of the expansion tank 4 between them. Thus, the left-right clearance between the combustion heating units 2 and 3 described above, that is, the upper side of the space where the expansion tank 4 is disposed is closed to prevent / suppress heat dissipation upward. Yes. Note that reference numeral 51 in FIGS. 2 and 3 denotes a combustion exhaust gas discharge port after the latent heat recovery.

  In the case of the above embodiment, the expansion tank 4 receives the radiant heat from the combustion heating unit 2 or 3 from both the left and right sides, and actively heats or at least keeps the expansion tank 4 by effective use of the radiant heat. Will be able to. As a result, it is possible not only to avoid a reduction in the efficiency of the heating circuit 22 due to heat radiation from the expansion tank 4, but also to improve the efficiency. In addition, since the upper part of the expansion tank 4 is covered by the secondary heat exchanger 5 and the heat escape path is blocked, that is, the upward heat radiation path is blocked, each combustion heating unit 2, 3 Even when the combustion is stopped, the heat radiation from the expansion tank 4 can be suppressed as much as possible, and the above efficiency reduction can be avoided and the efficiency can be further improved.

  Further, with the operation of the blower fans 31a, 36a, outside air is sucked into the blower fans 31a, 36a from the side air supply holes 11, 11,... Formed in the front cover 1a, or the front air supply holes 12, 12,. Even if the outside air is sucked from 13, 13,..., The expansion tank 4 is disposed at a position avoiding the passage of the outside air, so that heat radiation is promoted by being exposed to the outside air as in the past. In the present embodiment, it is possible to avoid the occurrence of such a situation.

  In the above embodiment, the combustion heating units 2 and 3 are individually provided with the blower fans 31a and 36a at the lower position. However, the present invention is not limited to this, and the combustion heating units 2 and 3 are combusted in common. One blower fan may be provided as a combustion air supply unit so as to supply the working air.

FIG. 1A is an explanatory diagram showing the configuration and principle of the present invention, and FIG. 1B is an explanatory diagram showing the conventional configuration and principle. It is a partially cutaway front explanatory view showing an embodiment of the present invention. It is explanatory drawing which shows an external appearance in the state of a perspective view. It is a schematic diagram which shows the example of what actualized the composite heat source machine of FIG. 2, FIG. It is a fragmentary perspective view for demonstrating the relationship between an expansion tank and both combustion heating parts. It is sectional explanatory drawing of the state seen from the side surface for demonstrating the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exterior case 2 Combustion heating part 3 for hot water supply Combustion heating part 4 for heating 4 Expansion tank 5 Secondary heat exchanger (heat exchanger for latent heat recovery)
11, 12, 13 Air supply holes 31a, 36a Blower fan (combustion air supply unit)

Claims (3)

A composite heat source machine comprising an outer case, two combustion heating parts capable of burning independently of each other, and an expansion tank for temporarily storing fluid passing through one combustion heating part,
The composite heat source machine, wherein the expansion tank is disposed in a position sandwiched between the two combustion heating sections in the outer case. The composite heat source machine according to claim 1,
Further comprising a heat exchanger for recovering latent heat from which the flue gas is led from the two combustion heating sections and recovering latent heat from the flue gas,
The two combustion heating units are arranged at both left and right positions sandwiching the expansion tank, while the latent heat recovery heat exchanger is located above the two combustion heating units so as to cover the expansion tank. A combined heat source machine arranged in a stretched state. The composite heat source machine according to claim 1,
A combustion air supply unit for supplying combustion air is attached to a lower position of the combustion heating unit, while an air supply hole for supplying outside air to the combustion air supply unit is provided in the outer case. Formed,
The said expansion tank is a composite heat source machine arrange | positioned in the position which avoids the passage of the external air from the said air supply hole to the combustion air supply part.

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