JP6128331B2 - Hot water heater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hot water circulation type hot water heating apparatus, and more particularly to a technique for improving construction workability.

    Recently, a hot water heater using a heat pump unit as a heat source has been proposed in place of a combustion hot water heater using fossil fuels such as oil and gas. As an example, Patent Document 1, for example, uses a heat pump unit (usually installed outdoors) as a heat source, generates hot water by exchanging heat with a hot water unit (usually installed indoors), and is a closed loop type. A heat pump type hot water heating apparatus that circulates the hot water circulation path and radiates heat with a hot water supply or a floor heater has been proposed.

According to the heat pump type hot water heating apparatus described in Patent Document 1, since the heat pump unit is used as a heat source, an accident such as a fire hardly occurs, and the amount of CO ₂ emission is small, so that it is friendly to the global environment. Moreover, since the drive control of the heat pump unit can be set finely, the set temperature of the hot water can be set widely from a low temperature to a high temperature.

  By the way, this type of hot water unit has a box-shaped housing, and an electrical component box equipped with piping and pumps for circulating hot water and electrical components for control are accommodated therein. Further, on the bottom surface of the casing, a hot water feed port and a return side hot water connection port, a refrigerant connection port, and the like are provided, from which hot water and refrigerant are drawn into the housing. Therefore, this type of housing is a wall-mounted type that is attached to a substantially vertical wall surface of a fixed structure such as a house in order to float the bottom surface (see, for example, Patent Document 2).

  However, in the conventional hot water unit, first, layout design of large parts such as a heat exchanger, an expansion tank, a circulation pump, and an auxiliary heater device is performed, and then piping is designed according to the position of the large parts. For this reason, small instruments such as pressure gauges, pressure safety valves, and water supply / drainage valves have been arranged in a uniform manner in the housing.

  Moreover, after installing the hot water unit on the wall surface, the water is filled into the pipe. At that time, these instruments are distributed in the casing, so that the work efficiency is poor. Furthermore, since the electrical component box is disposed so as to block the front surface of the casing, it is necessary to work by removing the electrical component box.

  Also, in the situation where the hot water unit is installed in the corner of the room, there is no opening space on the side, and access is possible only from the front inside the housing, so in some cases, it is necessary to remove and maintain each part, Workability was extremely poor.

JP 2013-185803 A JP 2011-137604 A

  Accordingly, an object of the present invention is to provide a hot water circulation device in which the layout of various components and piping is optimized so that maintenance work can be performed from the front of the housing without removing the electrical component box.

  In order to solve the above-described problem, the present invention includes a heat source unit that heats a heat medium, a hot water unit that circulates water, and a heating unit on the use side, and a first connection port is provided in the casing of the hot water unit. A first pipe that is connected to the heat source unit via the circulation of the heat medium, a second pipe that is connected via the second connection port so that the heating unit is included in a part of the water circulation path, and A heat exchanger for exchanging heat between the heat medium flowing in the first pipe and the water flowing in the second pipe, and using the heat medium to make the water in the second pipe hot water at a predetermined temperature; The second pipe is provided with at least an auxiliary heater device, a circulation pump, a water supply / drainage valve, a pressure gauge, a pressure safety valve, an expansion tank, and a strainer, and both the first and second connection ports are provided in the casing. Is located on the bottom of In the hot water heating apparatus, the heat exchanger, the auxiliary heater device, the expansion tank, the circulation pump, and the electrical component box are disposed in the upper space of the casing, and in the lower space of the casing, The water supply / drain valve, the pressure gauge, the pressure safety valve, and the strainer are provided in a pipe portion from the second connection port of the second pipe to the upper space of the casing, and a lower space of the casing At least the front side of the housing is open to improve workability during installation and maintenance of the hot water heater.

  The housing includes a back plate installed along a predetermined wall surface, a bottom plate that protrudes horizontally from a lower end of the back plate in a direction away from the wall surface, a top surface, a front surface, and left and right side surfaces. And a box-shaped exterior cover that is detachably attached to the back plate so as to cover. When the exterior cover is removed, it appears in a state where at least the front surface side of the lower space of the housing is open.

  Further, the back plate is provided with a support member for fixing the heat exchanger and the expansion tank to the back plate.

  According to the present invention, a heat exchanger, an auxiliary heater device, an expansion tank, a circulation pump, and the like are arranged in the upper space of the housing, and a part of the second pipe is a water inlet, a pressure gauge in the lower space of the housing. In addition, it is possible to perform maintenance work without removing the electrical component box by arranging the strainer and attaching the electrical component box including predetermined electrical components in the upper space without shielding the front surface of the lower space. .

The block diagram showing the structure of the hot water heating apparatus which concerns on one Embodiment of this invention. The perspective view which shows the internal structure of the housing | casing of a hot water unit. The left view which shows the internal structure of the housing | casing of a hot water unit. The perspective view which shows the state which removed the electrical component box of the said warm water unit. The front view which shows the lower space of the housing | casing of the said warm water unit.

  Next, although the hot water heating apparatus of this invention is demonstrated with reference to FIG. 1 thru | or 5, this invention is not limited to this.

  As shown in FIG. 1, the hot water heating apparatus 10 according to this embodiment includes a heat pump unit 20, a hot water unit 30 using the heat pump unit 20 as a heat source, and a heating unit 40 including a heating terminal on the use side. Yes.

  The heat pump unit 20 includes a compressor 21 that compresses a refrigerant that is a heat medium, a condenser 22, an expansion valve 23, and an evaporator 24, and includes a refrigerant circuit that is connected by a refrigerant pipe 25. The heat pump unit 20 is provided with two refrigerant connection ports 25 a and 25 b on the forward path side and the return path side for connecting the refrigerant pipe 25 to the first pipe 26 in the hot water unit 30.

  In the present invention, since the heat pump unit 20 is used as a heat source for heating, a four-way valve is not particularly required for a reversible cycle. Therefore, it is only necessary to have a minimum function that can serve as a heat source for generating hot water, and the specific configuration of each component may be arbitrarily selected according to specifications.

  The hot water unit 30 includes a first pipe 26 connected to the heat pump unit 20 via the refrigerant connection ports 25a and 25b, and a first heat radiation circuit 41 connected to the heating unit 40 side via the hot water connection ports 31a and 31b. Two pipes 31 and a heat exchanger 50 for exchanging heat between the refrigerant and water are provided.

  The heat exchanger 50 is a water-refrigerant heat exchanger, and in this embodiment, the condenser 22 is placed in a tank 51 for circulating water having a predetermined volume provided in a part of the second pipe 31 of the hot water unit 30. Is stored, and the circulating water is heated by the condenser 22 in the tank 51 to generate hot water. Although not shown, the heat exchanger 50 may be a double pipe heat exchanger, for example.

  The second pipe 31 includes a warm water connection port 31 a on the forward path for sending warm water generated by the heat exchanger 50 to the heating unit 40, and a warm water connection port on the return path for returning the warm water radiated by the heating unit 40 into the warm water unit 30. 31b.

  In the forward path side pipe 311 between the heat exchanger 50 and the forward path side hot water connection port 31 a in the second pipe 31, an auxiliary heater device 32 that further heats the hot water generated by the heat exchanger 50 and an air vent valve 33. And the 1st water supply / drain valve 38a is arrange | positioned.

  The auxiliary heater device 32 has an electric heater in a cylindrical casing, and is an electric heater while water or hot water (hereinafter collectively referred to as circulating water) drawn into the inside from the inflow port flows toward the downstream side. It is heated and flows out from an outlet (both not shown).

  The air vent valve 33 is attached to the upper end of the auxiliary heater device 32 in order to release the air accumulated in the auxiliary heater device 32 to the atmosphere. The specific configuration of the air vent valve 33 is an optional matter in the present invention.

  The first water supply / drain valve 38a is provided to inject water into the second pipe 31 or to extract circulating water, and has a nipple 381 connected to a water pipe or the like and an open / close cock 382 (FIG. 5). Reference) is provided. The first water supply / drainage valve 38a is provided adjacent to the outward path side hot water connection port 31a.

  A return side hot water connection port 31b of the second pipe 31 and a return side pipe 312 between the heat exchanger 50 include a strainer 34, a pressure gauge 35, an expansion tank 36, a pressure safety valve 37, a second water supply / drain valve 38b, and a circulation pump. 39 are arranged respectively.

The strainer (impurity removing means) 34 removes dust and impurities contained in the circulating water flowing in the second pipe 31. In addition to the strainer 34, a scale removing means for removing scale (calcium carbonate CaCo ₃ ) that is a precipitate of a calcium component contained in the circulating water may be further provided. As an example of the scale removing means, there is a scale removing heater that warms circulating water with a heater and attaches the scale to the heater for removal.

  The pressure gauge 35 is used to measure the pressure in the second pipe 31 that becomes a closed loop circuit when the heating unit 40 is connected. The measurement data of the pressure gauge 35 is sent to a control unit (not shown).

  The expansion tank 36 is a tank that absorbs the thermal expansion of the circulating water. The pressure safety valve 37 is a relief valve that forcibly opens the second pipe 31 to the outside air to prevent the pipe from bursting when the pipe pressure in the second pipe 31 exceeds a specified value due to boiling of the circulating water or the like. It is.

  The second water supply / drainage valve 38b is provided to inject water into the second pipe 31 or to drain the circulating water in the second pipe 31, and has a nipple 381 connected to a water pipe or the like at the tip. An open / close cock 382 is provided (see FIG. 5). In this embodiment, the second water supply / drainage valve 38b is provided adjacent to the return-side hot water connection port 31b.

  The circulation pump 39 is a pump for circulating the circulating water in the second pipe 31 in one direction (clockwise in this embodiment), and its drive is controlled by the control unit.

  The heating unit 40 includes a heat radiation circuit 41 connected to the warm water circulation path 31 on the warm water unit 30 side via the warm water connection port 31a on the forward path side and the warm water connection port 31b on the return path side. The warm water circulation path 41 is provided with a heating terminal 42 as a use side of the heat source. The heating terminal 42 may be, for example, a floor heating device, a radiator, a fan convector, or the like.

  Next, the housing structure of the hot water unit 30 will be described with reference to FIGS. First, the hot water unit 30 includes, for example, a back plate 100 attached along a substantially vertical wall surface of a fixed structure such as a house, and a bottom plate protruding in a direction away from the wall surface substantially horizontally from the lower end of the back plate 100. 200, and these are covered with the exterior cover 30a.

  The back plate 100 is a sturdy metal plate, and two attachment holes 101 for attaching the hot water unit 30 to the wall surface are provided at the upper end thereof. The back plate 100 is provided with a support member 300 for fixing the heat exchanger 50 and the expansion tank 36 to the back plate 100.

  Referring to FIG. 3, the support member 300 includes a first support member 310 that supports the bottom surface side of the heat exchanger 50, a second support member 320 that supports the bottom surface side of the expansion tank 36, the heat exchanger 50, and the second heat exchanger 50. A third support member 330 that supports the upper portion of the support member 320 as a group is provided.

  The first support member 310 is erected in a horizontal direction at a substantially right angle with respect to the back plate 100, and is made of metal that extends to the left and right (in the direction perpendicular to the paper surface in FIG. 3) according to the width of the heat exchanger 50. A horizontal first support portion 311 that is a support plate and supports the bottom surface 51 of the heat exchanger 50 is provided. Reinforcing plates 312 are provided along the vertical direction of the back plate 100 at both ends of the first support member 310.

  The second support member 320 is a metal support plate that is erected in a horizontal direction substantially perpendicular to the back plate 100 and extends to the left and right according to the width of the expansion tank 36. 361 (the left side surface in FIG. 3) has a height capable of supporting the bottom surface 362 of the expansion tank 36 at a position where it abuts along the front surface 53 (the right side surface in FIG. 3) of the heat exchanger 50.

  The second support member 320 is provided with a second support portion 321 that supports the back surface 361, the bottom surface 362, the front surface 363 and the left and right side surfaces 365 and 365 of the expansion tank 36. The 2nd support part 321 is formed in the cylinder shape which inserts the lower end side of the expansion tank 36, and supports the bottom face 362 horizontally. The second support member 320 is also provided with reinforcing plates 322 at both ends thereof.

  The third support member 330 is detachably attached to the back plate 100, and is formed in a cap shape that is attached so as to surround the upper portion of the heat exchanger 50 and the expansion tank 36 as a set. In this embodiment, the third support member 330 integrally forms the upper surface 54 and both side surfaces 55 and 55 of the heat exchanger 50 and the corners from the both side surfaces 365 and 365 and the upper surface 364 to the front surface 363 of the expansion tank 36. However, it may be arranged so as to surround at least the outer periphery.

  According to this, after mounting the heat exchanger 50 on the first support member 310, the expansion tank 36 is attached to the second support member 320, and then the third support member 330 is put on the third support member 330. By screwing to the back plate 100, the heat exchanger 50 and the expansion tank 36 can be fixed integrally, and maintenance is improved by a rational layout.

  As shown in FIGS. 2 and 3, a support column 340 for attaching the electrical component box 60 is attached to the second support member 320 and the third support member 330. As shown in FIG. 4, the support column 340 is an L-shaped angle that is screwed along the left front corner of the second support member 320 and the third support member 330, and there is a bottom surface of the electrical component box 60. The left side is fixed with screws.

  In this embodiment, the electrical component box 60 and the support column 340 are attached via hinge means (not shown), and the electrical component box 60 can be opened and closed around the hinge portion. In the present invention, the “upper space” refers to the upper space in the housing including the space where the electrical component box 60 is disposed, and the “lower space” refers to the lower space in the housing excluding the upper space. This space.

  The electrical component box 60 stores therein, for example, a control board and a power supply circuit for controlling the hot water heater 10 and has a structure in which water and dust do not easily enter the interior. In the unlikely event that a fire occurs in the electrical component box 60, it is preferable that the electrical component box 60 be processed so as not to spread out of the casing.

  A circulation pump 39 on the forward path side of the second pipe 31 is further provided in the upper space of the housing. Thereby, the lower space is exposed by arranging large components such as the heat exchanger 50, the expansion tank 36, the auxiliary heater device 32, the circulation pump 39, and the electrical component box 60 in the upper portion of the space.

  As shown in FIG. 5, the return-side pipe 312 of the second pipe 31 drawn into the housing from the return-side hot water connection port 31 b provided on the left end side of the bottom plate 200 is first vertically along the back plate 100. After being piped, it is bent at a substantially right angle, extends horizontally toward the right side surface, and further bent at an acute angle from the right side surface toward the upper left and connected to a circulation pump 39 disposed in the upper space. A water supply / drainage valve 38b, a pressure gauge 35, a pressure safety valve 37, and a strainer 34 of the return-side pipe 312 are disposed in the lower space in the middle.

  In addition, the return-side pipe 311 of the second pipe 31 is arranged substantially vertically from the forward-side hot water connection port 31a provided at substantially the center of the bottom plate 200 to the height of the outlet of the auxiliary heater device 32 in the upper space. From there, it is bent at a substantially right angle toward the auxiliary heater device 32, and further bent toward the back plate 100 side toward the front surface of the auxiliary heater device 32 and connected to the outlet of the auxiliary heater device 32. A water supply / drain valve 38a is disposed in the lower space in the middle of the operation.

  According to this, all the instruments (water supply / drainage valves 38a, 38b, pressure gauge 35 and pressure safety valve 37) necessary for performing the water injection operation to the second pipe 31 are concentrated in the lower space, and Since they are exposed toward the front surface of the housing, water can be poured and drained efficiently, and the electrical component box 60 is not affected by water.

  Further, since the strainer 34 for removing impurities is also housed in the lower space of the housing, the impurities accumulated in the strainer 34 can be easily removed.

  Furthermore, the heat exchanger 50 and the expansion tank 36 are arranged in the upper space so as to be leaned against the back plate 100 in the front-rear direction, and large parts such as the circulation pump 39 and the auxiliary heater device 33 are reasonably disposed in the upper space. By arranging, the layout can be optimized.

  Further, by attaching the electrical component box 60 to the front surface of the upper space of the housing, maintenance work in the lower space can be performed without removing the electrical component box 60. Furthermore, since the electrical component box 60 is disposed on the uppermost front surface, it is less susceptible to water.

  As described above, according to the present invention, the heat exchanger, the auxiliary heater device, the expansion tank, and the circulation pump are disposed in the upper space of the housing, and a part of the second pipe is disposed in the lower space of the housing. Is arranged to include a water inlet, a pressure gauge, a pressure safety valve and a strainer, and an electrical component box including predetermined electrical components inside is installed in the upper space without shielding the front of the lower space. The drainage and impurities removal to the second pipe can be performed without removing the.

DESCRIPTION OF SYMBOLS 10 Hot water heating apparatus 20 Heat pump unit 21 Compressor 22 Condenser 23 Expansion valve 24 Evaporator 30 Hot water unit 30a Exterior cover 31 Hot water circulation path 32 Auxiliary heater device 33 Air vent valve 34 Strainer 35 Pressure gauge 36 Expansion tank 37 Supply / drain valve 38 Pressure safety valve 39 Circulating Pump 40 Heating Unit 41 Heat Dissipation Circuit 42 Heating Terminal 50 Heat Exchanger 60 Electrical Component Box 100 Back Plate 200 Bottom Plate 300 Support Member 310 First Support Member 320 Second Support Member 330 Third Support Member 340 Support

Claims (3)

A heat source unit that heats the heat medium, a hot water unit that circulates water, and a heating unit on the use side, and is connected to the heat source unit through a first connection port in the casing of the hot water unit. A first pipe through which the heating unit circulates, a second pipe connected through the second connection port so that the heating unit is included in a part of the water circulation path, a heat medium flowing through the first pipe, and the second pipe A heat exchanger that exchanges heat with the water flowing through the water and makes the water in the second pipe hot water at a predetermined temperature by the heat medium, and an electrical component box, and the second pipe includes In the hot water heating apparatus in which at least an auxiliary heater device, a circulation pump, a water supply / drainage valve, a pressure gauge, a pressure safety valve, an expansion tank and a strainer are provided, and the first and second connection ports are both arranged on the bottom surface of the housing,
In the upper space of the housing, the heat exchanger, the auxiliary heater device, the expansion tank, the circulation pump, and an electrical component box are disposed,
In the lower space of the housing, the water supply / drainage valve, the pressure gauge, the pressure safety valve, and the strainer are provided in a piping portion from the second connection port of the second piping to the upper space of the housing. A hot water heating device, wherein at least a front side of the housing in the lower space of the housing is open to enhance workability during installation and maintenance of the hot water heating device. The housing covers a back plate that is installed along a predetermined wall surface, a bottom plate that protrudes horizontally from a lower end of the back plate in a direction away from the wall surface, and a top surface, a front surface, and left and right side surfaces. And a box-shaped exterior cover that is detachably attached to the back plate,
2. The hot water heater according to claim 1, wherein when the exterior cover is removed, the hot water heating apparatus appears in a state where at least a front surface side of the lower space of the housing is open.   The hot water heater according to claim 2, wherein a support member for fixing the heat exchanger and the expansion tank to the back plate is provided on the back plate.

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