JP2015004498A - Heat source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source device that can effectively use heat discharged as exhaust from an electric component box to a case.SOLUTION: A heat source device comprises: an electric component box 13 that houses electric components 31; an exhaust hood 42 including an exhaust fan that air-cools the electric components 31 in the electric component box 13 and discharges air in the electric component box 13; a drain pan 18 that receives drainage from heat exchangers; and a lower case 5 that houses the electric component box 13, the exhaust hood 42, and the drain pan 18 respectively. The air discharged from the electric component box 13 into the lower case 5 is guided to the drain pan 18 by the exhaust hood 42.

Description

  Embodiments of the present invention relate to a heat source device that constitutes, for example, an air conditioner, a heat pump water heater, and the like.

  Conventionally, as an example of this type of heat source device, an electrical component box that accommodates electrical components, a fan that air-cools electrical components in the electrical component box and exhausts air in the electrical component box to the outside of the electrical component box, 2. Description of the Related Art A drain pan that receives and collects drain from a heat exchanger and a housing that accommodates each of these electrical component boxes, a fan, and a drain pan are known (for example, see Patent Document 1).

JP 2012-87954 A

  However, in the thing of the said patent document 1, there exists the subject that the effective use of the heat | fever of the exhaust gas forcedly exhausted by the fan from the electrical component box to the housing of the whole apparatus is not achieved.

  In addition, the above-described conventional electrical component box is preliminarily formed with an empty space for accommodating optional electrical components as well as a space for accommodating regular electrical components. Is invited.

  This leads to an increase in the size of the housing of the heat source device that accommodates the electrical component box, and increases the amount of sheet metal used to form the housing of the heat source device and the electrical component box itself, thereby increasing costs. There is a problem of inviting.

  The problem to be solved by the present invention is to provide a heat source device capable of effectively utilizing the heat discharged as exhaust from the electrical component box into the housing.

  According to the embodiments of the present invention, an electrical component box that houses electrical components, an exhaust fan that exhausts air in the electrical component box, a drain pan that receives drain from a heat exchanger, and these electrical component boxes, an exhaust fan, and a drain pan Are respectively housed. Further, an exhaust guide is provided for guiding the exhaust exhausted from the electrical component box into the housing by the exhaust fan to the drain pan.

The principal part expansion perspective view of the heat-source apparatus which concerns on embodiment. The perspective view which abbreviate | omits and shows the whole structure of the heat-source apparatus which concerns on embodiment. (A) is the side surface schematic which shows the flow of the air in the electrical component box shown in FIG. 1, FIG. 2, (b) is the upper surface schematic which looked at FIG. 3 (a) from the upper surface. The perspective view which shows the structure of the lower housing | casing of the heat-source apparatus which concerns on embodiment. The figure which shows structures, such as a control apparatus which controls the refrigerating cycle of the heat source apparatus which concerns on embodiment shown in FIGS. 1-4, and its electrical component. The principal part expansion perspective view of FIG. FIG. 3 is an enlarged perspective view of the periphery of an outside air inlet shown in FIGS.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in several drawing.

  FIG. 2 is a perspective view in which a part of the entire configuration of the heat source device 1 after being assembled is omitted, and shows a state in which a part of a side panel 2 described later is removed. Further, in FIG. 2, the left end in the drawing is “front N”, the right end is “rear H”, the right side when viewed from the front N, and the side surface (front side) parallel to the longitudinal direction is “right side K”. The side surface opposite to the right side surface K is referred to as “left side surface E”.

  This heat source device 1 can be used as an air conditioner. That is, cold water or hot water can be generated, and the generated cold water is passed through an indoor water heat exchanger (not shown) to cool indoor air and cool the room (indoor). Further, the generated hot water is passed through an indoor water heat exchanger (not shown) to heat indoor air, thereby heating the room (indoor). In addition to this air conditioner, it can also be used as a heat pump water heater.

  Here, the heat source device 1 is formed in a rectangular shape that is long in the left-right direction in plan view. The heat source device 1 is a substantially lower half in the vertical direction, and includes a lower housing 5 that is an example of a housing of the heat source device 1 and a heat exchanging unit 6 that is placed on the lower housing 5. Yes. A machine room 7 is formed inside the lower housing 5. In FIG. 2, when viewed from the front N side or the back H side, the heat exchanging unit 6 is formed in an inverted trapezoid having a wide upper end and a thin lower end. On the contrary, the lower casing 5 is formed in a trapezoidal shape with a narrow upper end and a wide lower end. The upper end of the heat exchanging unit 6 and the lower end of the lower housing 5 have substantially the same width dimension, and the joint of the lower end of the heat exchanging unit 6 and the upper end of the lower housing 5 has substantially the same width dimension. Yes. For this reason, the heat source device 1 is formed in a drum shape in which the middle part in the vertical direction is narrowed.

  The heat exchange unit 6 includes a plurality (for example, four sets in FIG. 2) of heat exchanger modules 8, 8,... In the longitudinal direction of the heat source device 1 (left and right in FIG. 2), and the same number of fans 9, 9,. It is composed of In FIG. 2, a pair of heat exchanger modules 8 are arranged with a pair of front and rear (two) air heat exchangers 8a and 8b facing each other, and between the upper ends of these air heat exchangers 8a and 8b. A blower 9 is provided.

  A top plate 10 having a cylindrical outlet 11 is provided at the upper end opening of each heat exchanger module 8 so as to cover each blower 9. The projecting opening end face of the outlet 11 of each top plate 10 is covered with a fan guard 11a.

  Each of the heat exchanger modules 8, 8,. Thus, they are arranged so as to face each other in a V shape, and are formed so as to have a substantially V shape when viewed from the front.

  The lower housing 5 on which the heat exchange unit 6 is placed includes an upper frame 5a and a lower frame 5b, and a vertical frame 5c that connects the upper frame 5a and the lower frame 5b. For example, three side panels 2a and 2b are attached to the left and right side surfaces E and K along the longitudinal direction of the lower housing 5, and the front panel 3 is attached to the front surface N along the short side direction. The rear panel 4 is attached to the rear surface H, and the machine room 7 is formed in a space surrounded by the panels 2a, 2b, 3 and 4.

  The upper frame 5a and the lower frame 5b are assembled so as to form a horizontally-long rectangular frame shape in plan view, for example, with a shape steel having a required shape such as a U-shape. Although the longitudinal dimensions of each other are the same, the short dimension is such that the front frame N and the rear frame H are both shorter in the upper frame 5a and longer in the lower frame 5b.

  That is, the short direction dimension of the upper frame 5 a is short according to the short direction dimension of the heat exchanger module 8 constituting the heat exchanging unit 6. Therefore, the vertical frame 5c that connects the upper frame 5a and the lower frame 5b is provided so as to be inclined so that the dimension in the depth direction sequentially increases from the upper part to the lower part. And a rear view, each is formed into a substantially inverted V-shaped trapezoid.

  As described above, the heat exchanging portion 6 mounted on the lower housing 5 is inclined so that the front view is gradually reduced from the upper end toward the lower end to form a substantially V shape, and the lower housing 5 is lowered from the upper end to the lower end. As a result, the heat source device 1 as a whole is formed in a substantially drum shape in which the intermediate portion in the vertical direction is constricted as described above. .

  As shown in FIG. 4, the machine room 7 includes a variable capacity water circulation pump 12, a first set of refrigeration cycle units 1 RA, and a second set of refrigeration cycle units 2 RB in order from the rear H side to the front N side. And an electrical component box 13 is arranged.

  That is, the electrical component box 13 is disposed at a position close to the front N, and the water circulation pump 12 is disposed at a position closest to the rear surface H. Between these electrical component box 13 and the water circulation pump 12, a second set of refrigeration units is provided. A cycle unit 2RB and a first set of refrigeration cycle units 1RA are arranged.

  Thus, in the machine room 7, the electrical component box 13, the first set, the second set of refrigeration cycle units 1RA, 2RB, the water circulation pump 12, the refrigerant pipe and the water pipe are housed. These components are housed inside the side panels 2a, 2b constituting the left and right sides of the lower housing 5.

  FIG. 4 shows a configuration when the heat source device 1 shown in FIG. 2 is viewed from the side E opposite to the side K. As shown in FIG. 4, the first water heat exchanger 14 is disposed so that the water circulation pump 12 disposed on the back surface H side (left end side in FIG. 3) of the machine room 7 is close to the water circulation pump 12. . A second water heat exchanger 15 is disposed on the right side in the longitudinal direction of the lower housing 5 from the first water heat exchanger 14.

  As shown in FIG. 4, a first water pipe P1 is connected to the water circulation pump 12, and this is used as a return pipe from a place to be air-conditioned as an introduction pipe. A second water pipe P <b> 2 is connected across the water circulation pump 12 and the upper part of the first water heat exchanger 14.

  Furthermore, the lower part of the 1st water heat exchanger 14 and the upper part of the 2nd water heat exchanger 15 are connected by the 3rd water piping P3. A fourth water pipe P4 is connected to the lower part of the second water heat exchanger 15. The fourth water pipe P4 extends to the water circulation pump 12 side, and an extended end portion thereof is provided in parallel with the first water pipe P1 and protrudes from the back panel 4 to the outside. The fourth water pipe P4 extends as a lead-out pipe to a place to be air-conditioned and is connected to a room-side indoor water heat exchanger (not shown).

  As shown in FIG. 4, on the back side (right side K side) of the first water heat exchanger 14, two variable capacity compressors 16 and 16 and two four-way valves described later are provided. Two independent refrigeration cycle devices 1K including 17, 17, etc. are arranged.

  These are communicated with each other via a refrigerant pipe, and two sets of air respectively constituting the heat exchanger module 8 located on the backmost side H and the heat exchanger module 8 located on the near side. The heat exchangers 8a and 8b are connected via refrigerant pipes so as to form two independent refrigeration cycles, and the first set of refrigeration cycle units 1RA is configured.

  Further, on the back side (right side K side) of the second water heat exchanger 15, a refrigeration cycle comprising two variable capacity compressors 16 and 16 and two four-way valves 17 and 17 to be described later. Device 2K is arranged.

  These are communicated with each other via a refrigerant pipe, and two sets of air respectively constituting the heat exchanger module 8 located on the most front N side and the heat exchanger module 8 located on the far side. The heat exchangers 8a and 8b are connected via a refrigerant pipe so as to form two independent refrigeration cycles, and a second set of refrigeration cycle units 2RB is configured.

  That is, the machine room 7 in the lower housing 5 includes a first set of refrigeration cycle units 1RA and a second set of refrigeration units, excluding the air heat exchangers that constitute the four heat exchanger modules 8. Cycle unit 2RB is accommodated.

  The 1st water heat exchanger 14 and the 2nd water heat exchanger 15 are mutually connected in series via the 1st water piping-the 4th water piping P1-P4, and as shown in FIG. In the cycle units 1RA and 2RB, two sets of refrigeration cycle devices 1K and 2K are connected in parallel to one water heat exchanger 14 and 15, respectively.

  As shown in FIG. 4, a drain pan 18 is placed on the upper frame 5 a constituting the lower housing 5. Although not specifically shown, a drain hose is connected to the drain pan 18 and drain water is drained through the drain hose.

  The drain water is generated by the air heat exchangers 8a and 8b exchanging heat with the air during the heating operation to be described later, and condensing moisture contained in the air. The drain water is in the form of water droplets at the initial stage of its generation, and adheres to the outer surface of an air heat exchanger, for example, but gradually grows and drops and flows down to the drain pan 18.

  Furthermore, this drain water is drained to the outside through a drain hose.

  FIG. 5 is a configuration diagram mainly illustrating the refrigeration cycle of the heat source device 1 including the first to fourth refrigeration cycles R1 to R4.

  As shown in FIG. 5, the first set of refrigeration cycle units 1RA includes first and second refrigeration cycles R1 and R2, and the second set of refrigeration cycle units 2RB includes third and fourth refrigeration cycles. It is constituted by a system refrigeration cycle R3, R4.

  Since these refrigeration cycles R1 to R4 are refrigeration cycles having the same configuration except for a part thereof, only the refrigeration cycle R1 of the first system will be mainly described here, and the refrigeration cycles of the second to fourth systems will be described. The same numbers are assigned to the cycles R2 to R4, and a new description is omitted.

  In the refrigeration cycle R1 of the first system, the first port of the four-way valve 17 is connected to the discharge-side refrigerant pipe of the variable capacity compressor 16, and the second port of the four-way valve 17 is connected via the refrigerant pipe. One heat exchanger module 8 (a set of air heat exchangers 8a and 8b) communicates with each other. In FIG. 5, one heat exchanger is connected to each of the refrigeration cycles R <b> 1 to R <b> 2, but on the arrangement after assembly, as described with reference to FIG. 2, the two air heat exchangers 8 a, 8b are provided facing each other, and constitute a set of heat exchanger modules 8.

  Although not shown in FIG. 5, the air heat exchangers 8a and 8b are connected in parallel and communicate with refrigerant pipes provided with expansion valves 19 and 19, respectively. The refrigerant pipe communicates with a first refrigerant flow path 20 provided in the first water heat exchanger 14.

  The first refrigerant flow path 20 communicates with the third port of the four-way valve 17 via a refrigerant pipe. The fourth port of the four-way valve 17 communicates with the suction portion of the compressor 16 via a refrigerant pipe via a gas-liquid separator (not shown).

  On the other hand, the water circuit Z connects, for example, a first water pipe P1, which is a return pipe from a place to be air-conditioned (indoor water heat exchanger), to the water circulation pump 12. The discharge port side of the water circulation pump 12 is connected to the water flow path 21 of the first water heat exchanger 14 via the second water pipe P2. The water flow path 21 of the water heat exchanger 14 is communicated with the water inlet side of the water flow path 21 of the second water heat exchanger 15 via the third water pipe P3. The water outlet side of the water channel 21 is led from the fourth water pipe P4 to a place to be air-conditioned.

  The refrigeration cycle R2 of the second system is configured in exactly the same manner as the refrigeration cycle R1 of the first system, and the four-way valve 17 is connected to the second refrigerant flow path 22 of the first water heat exchanger 14 via the refrigerant pipe. Connected.

  That is, in the first water heat exchanger 14, the first refrigerant channel 20 and the second refrigerant channel 22 are alternately provided on both sides of one water channel 21, and one water heat exchange is performed. The refrigerator 14 is used by the first and second two refrigeration cycles R1, R2, and the refrigeration cycles R1, R2 are connected in parallel.

  Similarly, the second water heat exchanger 15 is also provided with the first refrigerant flow path 20 and the second refrigerant flow path 22 alternately on both sides of the one water flow path 21. The two water heat exchangers 15 are shared by the third and fourth refrigeration cycles R3 and R4, and the refrigeration cycles R3 and R4 are connected in parallel.

  Thus, the water circulation pump 12, the first water heat exchanger 14 and the second water heat exchanger 15 are disposed in the machine room 7, and the first to fourth water pipes P1 to P4 are The water circulation pump 12, the first water heat exchanger 14, and the second water heat exchanger 15 are connected in series.

  That is, the first set of refrigeration cycle units 1RA includes a first refrigeration cycle R1 and a second refrigeration cycle R2, and the second set of refrigeration cycle units 2RB includes a third refrigeration cycle R3. And a fourth system refrigeration cycle R4.

  Therefore, for example, water introduced at 12 ° C. is cooled to 9.5 ° C. in the first water heat exchanger 14, and further cooled, for example, 2.5 ° C. to 7 ° C. in the second water heat exchanger 15. It is derived as cold water whose temperature has dropped. This cold water is led to the indoor water heat exchanger installed in the place to be air-conditioned via the second water pipe P2 which is a lead-out pipe, and cools the air led by the indoor fan to perform the cooling action. .

  Further, the refrigerant evaporated in the first and second water heat exchangers 14 and 15 is introduced into the gas-liquid separator via the four-way valve 17 and is separated into the gas and liquid here, and is then sucked into the compressor 16. It is compressed again and the above refrigeration cycle is repeated.

  Thus, by connecting the water flow paths 21 and 21 of the first water heat exchanger 14 and the second water heat exchanger 15 in series, the temperature of the cold water is lowered in two stages, so that a larger amount of water can be obtained. Useful cooling performance is obtained.

  In addition, the first water heat exchanger 14 communicates with the two refrigeration cycles R1 and R2 of the second system, so that one refrigeration cycle R1, R2 is compressed by one. It becomes possible to mount the machine 16.

  Similarly, the second water heat exchanger 15 is also connected to the refrigeration cycle R3 of the third system and the refrigeration cycle R4 of the fourth system, so that one refrigeration cycle R3, R4 is compressed one by one. It becomes possible to mount the machine 16.

  Accordingly, all the refrigeration cycles R1 to R4 are independent, and it is not necessary to perform oil leveling in the compressor 16 of the lubricating oil that circulates in the refrigerant circuit, and it is possible to prevent performance degradation due to oil leveling. In addition, even if one refrigeration cycle (for example, R1) is stopped, the operation can be continued with the other three refrigeration cycles (R2 to R4). Can be secured.

  In addition, since all the compressors 16 and the water circulation pump 12 are configured to be variable in capacity, efficient operation is possible according to the heating / cooling load.

  That is, each compressor 16 incorporates a three-phase motor, and the compressor 16 is driven by this three-phase motor. The compressor 16 includes a voltage-controlled PWM inverter 23 that controls the voltage and frequency applied to the three-phase motor by chopping the applied voltage at a predetermined carrier frequency, and is configured as a variable capacity type. ing.

  The inverter 23 is connected to a converter 25 that rectifies the three-phase AC of the three-phase AC power source 24 into a DC voltage via a smoothing capacitor 26 that smoothes the DC voltage and a power factor improving reactor 27. The inverter 23 is connected to a plurality of, for example, A, B, C, D controllers 28, 28,... That control the frequency of the output voltage. The A to D controllers 28, 28,... Are connected to the overall controller 29 by signal lines (not shown).

  When the overall controller 29 receives a temperature command signal set by operating the operation unit 30 or the like, the overall controller 29 calculates the difference between the temperature of discharged water (hot water or cold water) and the command temperature, and the discharge water temperature is the command temperature. The operation of the refrigeration cycles R1 to R4 of each system is controlled so as to be constant. The control content includes, for example, an operation mode of cooling operation or heating operation, the number of compressors 16 to be operated, the identification and operation frequency of the compressor 16, the operation frequency of the water circulation pump 12, and the like.

  This control content is given to the AD controllers 28, 28,... Of the required refrigeration cycle unit as an operation command signal. These AD controllers 28, 28,... Provide control signals corresponding to the operation command signals to the inverters 23, 23,..., The compressor 16, the four-way valve 17, and the fans of the air heat exchangers 8a, 8b, respectively. The refrigeration cycles R1 to R4 are controlled.

  That is, the A to D controllers 28, 28,... Change the output of the inverter 23 to control the operating frequency of the compressor motor to control the rotation speed of the compressor 16 and cool or heat the four-way valve 17. Are switched according to the operation mode, and the rotational speed of the fan of the air heat exchangers 8a and 8b and the rotational speed of the water circulation pump 12 are controlled to required values.

  These inverters 23, 23, ..., converters 25, 25, ..., smoothing capacitors 26, 26, ..., reactors 27, 27, ..., A to D controllers 28, 28, ..., an overall controller 29 and an operation unit 30 is accommodated in the electrical component box 13 as a control electronic component or electrical component of the regular electrical component 31.

  The electrical component box 13 includes a sheet metal electrical component box body 32 as shown in FIGS. 1, 2, 3, 3, and 8, and the electrical component box body 32 includes a plurality of the above-described common electrical components. 31 is accommodated.

  FIG. 3A is a schematic side view showing a flow of air in the electrical component box 13 as viewed from the right side K, and FIG. 3B is a top view of FIG. 3A viewed from the top. FIG.

  As shown in FIGS. 1 and 6, etc., the electrical component box main body 32 has a side panel 2a side (the right side K side in FIGS. 1 and 2, etc.) that is almost completely open. The side panel 2b side (left side E side) on the side is also opened almost entirely.

  As shown in FIG. 3, the electrical component box main body 32 has a pair of side plates 32N and 32H that stand substantially vertically on both ends in the longitudinal direction (left and right ends in FIGS. 1 and 6) on the bottom plate 32B. A central partition space 33 is provided across the side plates 32N and 32H to divide the electrical component box main body 32 into two left and right chambers with a predetermined gap when viewed from the front N or the back H. ing.

  Two compressors 16 and 16 constituting the first set of refrigeration cycle units 1RA are disposed in one chamber on the side panel 2a side (the right side K side in FIGS. 1 and 2) partitioned by the central partition space 33. And the regular electrical component 31 for driving the two air blowers 9 and 9 is accommodated. Similarly, in one chamber on the side panel 2b side (left side E side in FIGS. 1 and 2, etc.), the two compressors 16 and 16 and the two blowers 9 and 9 constituting the second set of refrigeration cycle units 2RB are provided. The common electrical component 31 for driving is housed. A heat sink 37 for cooling these electrical components 31 is provided in the central partition space 33 so as to protrude.

  The bottom plate 32 </ b> B of the electrical component box main body 32 is provided with an outside air inlet 34 that communicates with the central compartment space 33. On the other hand, the side plate 32H on the right side of FIG. 3A of the electrical component box 13 is provided with an exhaust port 35, and an exhaust fan 36 for discharging the air in the central partition space 33 is provided at the exhaust port 35. The air taken into the central partition space 33 from the outside air inlet 34 cools the heat sink 37, and the air heated by the heat sink 37 is exhausted out of the electrical component box 13 by the exhaust fan 36. That is, the central partition space 33 has a function of a ventilation path.

  On the right side of the electrical component box 13 in FIGS. 1 and 6, an optional electrical component accommodating portion 38 having a required width is provided in parallel in the longitudinal direction of the machine room 7. The optional electrical component housing portion 38 is a housing space in which an optional electrical component 39 such as a harmonic reduction device, for example, which is not the regular electrical component 31 among electrical components can be appropriately inserted and fixed.

  The harmonic reduction device is, for example, an 18-pulse rectifier or a 12-pulse rectifier, and is connected between the inverter 23 and the converter 25 to reduce harmonics. The harmonic reduction device includes an air cooling fan 40 for forcibly air cooling the interior thereof. In the present embodiment, a total of four optional electrical parts 39 can be mounted, two on the right side K and two on the left side E.

  The optional electrical component accommodating portion 38 and the electrical component box main body 32 are partitioned by a pair of left and right sheet metal partition plates 41a and 41b whose side surface shape, which is an example of a partition member, is a right triangle.

  The pair of left and right partition plates 41a and 41b are arranged such that a vertical side portion rising at a right angle of the right triangle is arranged so as to be continuous with the side plate 32H on the optional electrical component housing portion 38 side of the electrical component box body 32, while the inclined side thereof The part is arranged toward the outside of the machine room 7 (the right side K side or the left side E side of the heat source device 1), and the side panels 2a and 2b are attached to these inclined side parts in close contact with each other.

  By the pair of left and right partition plates 41a and 41b, heat or hot air generated in the optional electrical component 39 or the like of the optional electrical component accommodating portion 38 is directed toward the electrical component box 13 (the left direction in FIGS. 1, 2, and 6). ) Can be blocked and diffused and guided to the drain pan 18 side above the optional electrical component accommodating portion 38 to heat the drain pan 18.

  As shown in FIGS. 1, 3A, and 6, the electrical component box 13 is provided with an exhaust port 35 in the side plate 32H on the optional electrical component housing portion 38 side, and an exhaust fan 36 is provided in the exhaust port 35. Is provided. A rectangular tube-shaped exhaust hood (exhaust guide) 42 is provided on the upper part of the optional electrical component housing portion 38 so as to cover the exhaust fan 36.

  The exhaust hood 42 is provided with a hood exhaust port 43 having substantially the entire surface opened at the upper end in FIGS. 1, 3A, and 6 facing the bottom side of the drain pan 18. By operating the exhaust fan 36, the air in the central compartment space 33 in the electrical component box 13 is exhausted from the hood exhaust port 43 to the outside, so that outside air is discharged from the intake port 44 described later via the external air suction port 34. The central compartment space 33 in the box 13 is sucked and ventilated, and the heat sink 37 of the regular electrical component 31 of the electrical component box 13 is forcibly air-cooled. The exhaust after forced air cooling of the regular electrical component 31 becomes warm air, and is exhausted from the hood exhaust port 43 into the machine room 7 on the upper side of the optional electrical component accommodating portion 38, that is, into the space in the lower housing 5. .

  The warm air is guided by the exhaust hood 42 and blown from the hood exhaust port 43 to the bottom surface of the drain pan 18. Since the exhaust blown to the bottom surface of the drain pan 18 is air heated in the electrical component box 13, that is, warm air, the drain pan 18 can be heated.

  Thereby, it is possible to prevent or reduce the freezing of the drain of the drain pan 18 when the heat source device 1 is in the heating operation and at a low external temperature. That is, the heat of the exhaust can be used effectively.

  FIG. 7 is an enlarged perspective view of the air inlet 44 shown in FIGS. 1, 2 and 4 and its peripheral portion, and the arrows in FIG. 7 indicate the direction of air flow. As shown in these drawings, the air inlet 44 opens substantially below the electrical component box 13 of the lower frame 5b, and inside the air inlet 44 is a ventilation communicating with the opening of the bottom plate 32B of the electrical component box 13. A path 45 is formed. External outside air and room air are introduced into the electrical component box 13 through the air inlet 44, the ventilation path 45, and the outside air inlet 34.

  The ventilation passage 45 is provided with a flat baffle plate 46 having a required shape such as a rectangle standing upright at a required interval in the vicinity of the inner surface of the intake port 44.

  Therefore, when the indoor air or the outside air flows into the ventilation path 45 inside through the intake port 44 as shown by the arrow in the figure, it collides with the baffle plate 46 and the ventilation direction is changed. Further, when ventilation collides with the baffle plate 46, dust and moisture in the ventilation are separated, so that the ventilation is purified. The purified air is introduced into the electrical component box 13 through the ventilation path 45, and the regular electrical component 31 is forcibly cooled by air.

  For this reason, it is possible to prevent or reduce the contamination of the inner surface of the electrical component box 13 and the regular electrical component 31 inside the electrical component box 13 with moisture and dust in the air.

  As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of this invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the present invention. These embodiments and modifications thereof are included in the scope and gist of the present invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Heat source apparatus, 5 ... Lower housing, 5a ... Upper frame, 5b ... Lower frame, 5c ... Vertical frame, 6 ... Heat exchange part, 7 ... Machine room, 13 ... Electrical component box, 14 ... 1st water heat exchange 18 ... Drain pan, 31 ... Regular electrical components, 38 ... Optional electrical component storage, 39 ... Optional electrical components, 42 ... Exhaust hood (exhaust guide).

Claims (2)

An electrical component box that accommodates electrical components, an exhaust fan that cools the electrical components in the electrical component box and exhausts air in the electrical component box, a drain pan that receives drain from the heat exchanger, and these electrical component boxes and exhaust fans In the heat source device having a housing for accommodating the drain pan,
A heat source apparatus, comprising: an exhaust guide that guides the exhaust exhausted from the electrical component box into the housing by the exhaust fan to the drain pan. Of the electrical components, the regular electrical component is accommodated in the electrical component box, while the optional electrical component accommodating portion for accommodating the optional electrical component of the electrical component is juxtaposed with the electrical component box. The heat source device according to claim 1, wherein the component housing portion and the electrical component box are partitioned by a partition plate extending in a vertical direction.

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