JP2015148425A - hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that when water is leaked from a water heat exchanger, an electric substrate in a housing may get soaked in the water resulting in malfunction.SOLUTION: A hot water storage type water heater includes: a hot water storage tank 3 which is provided in a housing 52 and stores hot water; a tank heat insulating material 51 which covers an entire surface of the hot water storage tank 3; a water heat exchanger 19 for conducting heat exchange with hot water in the hot water storage tank 3; a heat exchanger heat insulating material 53 which is provided at an upper part of the hot water storage tank 3 and stores the water heat exchanger 19; and an electric substrate provided at a front surface side space in the housing 52. A drain channel 53g communicating with a rear surface side space in the housing 52 is provided on an inner bottom surface of the heat exchanger heat insulating material 53.

Description

  The present invention relates to a hot water storage type hot water supply apparatus provided with a hot water storage tank, a water heat exchanger, and an electrical board in a housing.

  Conventionally, in this type of hot water storage type hot water supply apparatus, there has been provided a water heat exchanger for heating hot water in the hot water storage tank at the upper part of the hot water storage tank and an electrical board in the housing.

JP 58-33054 A

  However, in this conventional device, when a water leak occurs from the water heat exchanger, the electrical board in the housing may get wet and cause a failure.

  In order to solve the above problems, the present invention provides a hot water storage tank provided in a housing for storing hot water, a tank heat insulating material covering the entire surface of the hot water storage tank, and a water heat exchanger for exchanging heat with the hot water in the hot water storage tank. A heat-insulating and heat-insulating material that is provided in an upper portion of the hot water storage tank and in which the water heat exchanger is accommodated, and an electrical board that is provided in a front-side space in the housing, A drainage channel communicating with the back side space in the casing was provided on the bottom surface.

  Moreover, the drainage groove part for inducing water toward the said drainage channel was provided in the inner bottom face of the said heat exchanger heat insulating material.

  In addition, the inner bottom surface of the heat exchanger and heat insulator is inclined in order to guide water toward the drainage channel.

  According to the present invention, even if a water leak occurs from the water heat exchanger, it flows out from the bottom of the heat exchanger and the heat insulation box through the drainage channel to the back side space in the case. Water is not splashed on the electrical board provided in the space, so that the induction of failure can be prevented.

The schematic block diagram of the hot water storage type hot water supply apparatus of one Embodiment of this invention Exploded perspective view of the same embodiment Main part sectional drawing of the same embodiment Top view (A) and AA cross-sectional view (B) of heat exchanger and heat insulating material of the same embodiment

Next, a hot water storage type hot water supply apparatus 1 according to an embodiment of the present invention will be described with reference to FIG.
2 is a hot water storage tank unit having a stainless steel hot water storage tank 3 for storing hot water, 4 is a heat pump unit constituting heating means for boiling hot water in the hot water storage tank 3 mainly at midnight, etc., 5 is a hot water supply set temperature. This is a remote controller for performing operations such as changing the.

  The hot water storage tank unit 2 includes a water supply pipe 6 for supplying city water to the bottom of the hot water storage tank 3, a hot water discharge pipe 7 for discharging hot water from the upper part of the hot water storage tank 3, a water supply bypass pipe 8 branched from the water supply pipe 6, and a hot water supply pipe 7. A hot water mixing valve 9 for mixing hot water from the hot water supply water and water from the water supply bypass pipe 8 so as to reach a hot water supply set temperature, a hot water supply pipe 11 for supplying hot water mixed by the hot water supply mixing valve 9 to the faucet 10, A hot water supply temperature sensor 12 provided in the middle of the hot water supply pipe 11 for detecting the hot water supply temperature, a hot water supply flow rate sensor 13 provided in the middle of the hot water supply pipe 11 for detecting the flow of hot water supply, and a plurality of hot water supply temperatures provided on the upper and lower sides of the hot water storage tank 2. Is provided with a hot water storage temperature sensor 14 for detecting the pressure, a pressure reducing valve 15 provided in the water supply pipe 6 for reducing the water supply pressure of city water to a constant pressure, and an overpressure relief valve 16 for releasing the overpressure in the hot water storage tank 2. ing.

  The hot water storage tank unit 2 is provided near the lower part of the hot water storage tank 3 of the hot water circulation circuit 17 and the heating circulation circuit 17 that connects the lower part and the upper part of the hot water storage tank 3. A circulation pump 18 that circulates in the upper part of the hot water storage tank 3, a water heat exchanger 19 that is provided on the downstream side of the circulation pump 18 of the heating circulation circuit 17 and constitutes a heating means for boiling hot water in the hot water storage tank 3, and heating A boiling temperature sensor 20 is provided on the downstream side of the water heat exchanger 19 in the circulation circuit 17 and detects the temperature of hot water flowing out from the water heat exchanger 19, and the refrigerant from the heat pump unit 4 is used as the water heat exchanger 19. In-machine refrigerant circuit 21 for circulation to the primary side of the engine, and refrigerant pipe connection ports 23a and 23b for connecting the in-machine refrigerant circuit 21 and the external refrigerant pipe 22 are provided.

  The heat pump unit 4 includes a compressor 24 that compresses refrigerant, an expansion valve 25 that decompresses refrigerant radiated by the water heat exchanger 19, an evaporator 26 that evaporates low-temperature and low-pressure refrigerant, a compressor 24, and expansion. Refrigerant pipe connection ports 28a and 28b for connecting the refrigerant pipe 27 and the refrigerant pipe 27 and the in-machine refrigerant pipe 21 in the hot water storage tank unit 2 with the external refrigerant pipe 22 to connect the valve 25 and the evaporator 26 in an annular shape. And a blower 29 that blows outside air as a heat source to the evaporator 26.

  Reference numeral 30 is provided in the hot water storage tank unit 2, and the detection values of the hot water temperature sensor 12, the hot water flow rate sensor 13, the hot water temperature sensor 14, and the boiling temperature sensor 20 are input to control the operation of the hot water mixing valve 9 and the circulation pump 18. The hot water storage control means is connected to the heat pump unit 4 and the remote controller 5 so that necessary information can be transmitted and received. Here, the hot water storage control means 30 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  31 is provided in the heat pump unit 4, and detection values of various sensors (not shown) are input to control the operations of the compressor 24, the expansion valve 25, and the blower 29, and to transmit and receive necessary information with the hot water storage control means 30. It is a connected heating control means. Here, the heating control means 31 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  The remote controller 5 has a display unit 32 for displaying various information related to the water heater (hot water set temperature, amount of remaining hot water, operating state of the water heater, etc.) and an operation switch 33 such as a setting switch for setting and operating the hot water set temperature. Remote control that receives an operation signal of the operation switch 33 and a signal from the hot water storage control means 30 and causes the display unit 32 to display a predetermined necessary display and transmits a signal based on the operation signal to the hot water storage control means 30 Means 34 are provided. Here, the remote control means 34 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  Here, the hot water storage control means 30, the heating control means 31, and the remote control means 34 exchange necessary information with each other and act as control means for controlling the operation of the hot water storage water heater 1 in cooperation with each other.

  Next, the boiling operation will be described. In the midnight time zone, the hot water storage control means 30 outputs a boiling start command to the heating control means 31 and then drives the circulation pump 18 to receive the boiling start command. The heating control means 31 drives the compressor 24, the expansion valve 25, and the blower 29 so that the hot water storage control means 30 and the heating control means 31 are set so that the temperature detected by the boiling temperature sensor 20 becomes the boiling target temperature. Cooperate boiling operation.

  In this boiling operation, the refrigerant that has been made high temperature and high pressure by the compressor 24 circulates through the primary side of the water heat exchanger 19 and exchanges heat with the water on the secondary side, and is then depressurized by the expansion valve 25 and is cooled to a low temperature. The refrigerant enters a low-pressure gas-liquid two-phase state, and the low-temperature and low-pressure refrigerant evaporates by receiving heat from the outside air supplied by the blower 29 in the evaporator 26, and the water in the hot water storage tank 3 is absorbed by the refrigeration cycle sucked into the compressor 24. Heated.

  When it is detected that the hot water storage amount detected by the hot water storage temperature sensor 14 has reached a predetermined target hot water storage amount, the hot water storage control unit 30 outputs a boiling stop command to the heating control unit 31 and then stops the circulation pump 18. Then, the heating control means 31 that has received the boiling stop command stops the compressor 24, the expansion valve 25, and the blower 29, and stops the boiling operation.

Next, the structure of the hot water storage tank unit 2 will be described with reference to FIG. FIG. 2 is an exploded perspective view of the hot water storage tank unit 2.
Reference numeral 51 denotes a tank heat insulating material made of a foam molding material that covers the substantially entire surface of the hot water storage tank 3 and keeps the hot water stored, and includes a front heat insulating material 51 a that covers the front surface of the hot water storage tank 3, A bottom heat insulating material 51c covering the bottom surface of the hot water storage tank 3, a pipe outlet hole 51d for taking out the hot water discharge pipe 7, and an upper heat insulating material 51e covering the upper surface of the hot water storage tank 3 and a top heat insulating material 51f covering the pipe outlet hole 51d. The heat insulating material is divided and configured to be connected by a combined structure.

  52 is a housing of the hot water storage tank unit 2, which is composed of a front panel (not shown), a right side plate 52a, a left side plate 52b, a back plate 52c, a bottom plate 52d, and a top plate 52e, and a hot water storage tank 3 below the bottom plate 52c. Supporting legs 52f are provided, and adjacent plates are firmly fixed by screwing.

  In addition, in the front side space between the front panel of the housing 52 and the tank heat insulating material 51, the hot water supply mixing valve 9 provided with electric drive parts such as a motor and the electric circuit board constituting the hot water storage control means 30 (FIG. Electrical components such as (not shown) are arranged, and a front panel that can be easily attached and detached is removed so that maintenance can be performed.

  53 is a heat-insulating material made of foamed molding material that is arranged at the upper part of the hot water storage tank 3 and keeps the water heat exchanger 19 warm. A box-shaped heat-insulating heat box 53 a that is open on the upper surface side and accommodates the water heat exchanger 19. The heat-insulating and warming box 53a is composed of a heat-insulating and warming lid 53b that closes the upper surface opening of the heat-insulating and warming box 53a and a lid pressing member 53c that presses the heat-insulating and warming lid 53b.

  Here, the water heat exchanger 19 is obtained by winding a heat exchange pipe 19a such as a double pipe provided with an inner pipe through which a refrigerant flows inside an outer pipe through which water flows in a square cylinder spiral shape. After the heat exchange tube 19a is wound around the core jig, the core jig is detached from the core jig and formed.

  As shown in FIG. 3, the heat-insulation warming box 53a is provided with a groove 53a1 that engages with a rising edge 51e1 around the pipe outlet hole 51d of the upper heat insulating material 51e on a part of its bottom surface. The part 51e1 and the groove part 53a1 are positioned and placed on the upper heat insulating material 51e so as to engage with each other.

  On the inner bottom surface of the heat exchanger / warm box 53a, a protrusion 53d protruding from the bottom surface is integrally provided at a position corresponding to the hollow portion at the center of the spiral water heat exchanger 19 when the water heat exchanger 19 is accommodated. The water heat exchanger 19 is prevented from moving.

  A lid side projection 53e equivalent to the projection 53d is integrally provided at a position corresponding to the projection 53d also from the bottom surface of the heat insulation lid 53b, and the projection height of the lid side projection 53e is determined by the heat exchange. When the heat exchanger warming lid 53b is attached to the heat insulation box 53a, the lid side projection 53e is in contact with the upper surface of the projection 53d.

  The top heat insulating material 51f is mounted on the upper heat insulating material 51e so as to block the pipe outlet hole 51d of the upper heat insulating material 51e so that a part of the top heat insulating material 51f is engaged with the heat exchanger heat insulating box 53a. Is placed.

  The lid pressing member 53c has a height between the top surface of the heat exchanger insulating lid 53b and the top plate 52e, and a part thereof has a height between the top surface of the top heat insulating material 51f and the top plate 52e. A positioning protrusion 53c1 that engages with a groove 51f1 provided on the top surface of the top heat insulating material 51f is provided on the bottom surface that is formed and contacts the top surface of the top heat insulating material 51f. The size of the lid pressing member 53c in the width direction is about half the diameter of the hot water storage tank 3.

  FIG. 4 is a top view (a) and AA sectional view (b) of the heat-insulating / warming box 53a containing the water heat exchanger 19, and the AA sectional view (b) appears in the top view (a). There is no additional heat insulation warming lid 53b.

  A drainage groove 53f is formed in the inner bottom surface of the heat-insulation / warming box 53a so as to surround the outer periphery of the water heat exchanger 19 so as to surround it, and a housing is formed on the bottom surface of the drainage groove 53f near the rear side of the casing 52. A drainage channel 53g communicating with the back side space of the body 52 is established.

  The drainage groove 53f is shallow at a position away from the drainage channel 53g and is inclined and recessed so that the groove depth becomes deeper as it approaches the drainage channel 53g, so that the drainage can be drained naturally. .

  The drainage channel 53g is provided at a position away from the center of the hot water storage tank 3 on the back side, and combined with the hemispherical upper shape of the hot water storage tank 3, it can ensure a long channel length, and this drainage channel 53g It is difficult for air to flow outside the heat exchanger and heat insulation box 53a, and a decrease in the heat insulation property of the water heat exchanger 19 is suppressed.

  As described above, since the heat exchanger 53 is provided with the drainage groove 53f and the drainage channel 53g, even if a water leak occurs from the water heat exchanger 19, the water leakage smoothly flows into the drainage channel 53g by the drainage groove 53f. After being guided, it passes through the drainage channel 53g and flows out into the back side space in the housing 52, so that the electric drive parts and the electrical board present in the front side space in the housing 52 are not splashed with water, It is possible to prevent unnecessary failure induction due to water wetting.

  In addition, the water leaked out to the back side space in the casing 52 is allowed to flow out to the outside from a drain port (not shown) opened in the bottom plate 52d of the casing 52.

  The present invention is not limited to the above embodiments, and can be modified without changing the gist of the invention. For example, the heat pump unit 4 is configured separately from the hot water tank unit 2. However, this may be integrated, or may be applied to a heat exchanger that holds a water heat exchanger that heats an external fluid using hot water in the hot water storage tank 3 as a heat source.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply apparatus 3 Hot water storage tank 19 Hydrothermal exchanger 51 Tank heat insulating material 52 Case 53 Heat exchanger heat insulating material 53f Drain groove part 53g Drainage channel

Claims (3)

  A hot water storage tank provided in the housing for storing hot water, a tank heat insulating material that covers the entire surface of the hot water storage tank, a water heat exchanger for exchanging heat with the hot water in the hot water storage tank, and an upper portion of the hot water storage tank. A heat exchanger and a heat insulating material in which the water heat exchanger is accommodated, and an electrical board provided in a front space in the housing, and a back surface space in the housing on the inner bottom surface of the heat exchanger A hot water storage type hot water supply apparatus characterized in that a drainage channel is provided.   The hot water storage type hot water supply apparatus according to claim 1, wherein a drainage groove portion for guiding water toward the drainage channel is provided on an inner bottom surface of the heat exchanger.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein an inner bottom surface of the heat-insulating heat insulating material is inclined to guide water toward the drainage channel.

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