JP2008075916A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid waste of a piping material in additionally installing a hot water storage tank in a hot water storage type water heater. <P>SOLUTION: A water supply pipe 314 for supplying the water to the hot water storage tank is disposed at a lower part of the hot water storage tank 401. One end side of a first connection pipe 321 is connected to a lower portion of the hot storage tank. The first connection pipe is rotatable on the connecting portion. As the first connection pipe is rotatable, the other end side can be connected even to a pipe except for the water supply pipe. When the hot water storage type water heater is singly used, the connecting portion 342 of the first connection pipe is connected to the water supply pipe to form a tank hot water supply circuit from the water supply pipe to a hot water supply opening through the hot water storage tank. When an additional tank 405 is installed, only the connecting portion is disconnected to connect a pipe 355 of the additional tank to the connecting portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a hot water storage tank.

  An example of a water heater having a hot water storage tank is described in Patent Document 1. In the water heater described in the rear, a hot water discharge pipe is connected to the upper part of the hot water storage tank in order to eliminate the need for changing the pipe of the water supply pipe or changing the pipe in the housing. One end of the first connecting pipe is connected to the lower part of the hot water storage tank, and one end of the second connecting pipe is connected to the other end of the circulation pipe. The first connecting pipe and the second connecting pipe are connected by a connecting pipe.

  An example of a water heater having a hot water storage tank is disclosed in Patent Document 2. In the water heater described in this publication, an inverted T-shaped water pipe is extended from the bottom of each hot water storage tank, and a water supply pipe to each hot water storage tank is connected. Moreover, in the water heater described in Patent Document 3, hot water heated by the heat pump operation is directly supplied. And by adding a so-called hot water storage operation function that stops the operation after executing the hot water storage operation after using the hot water supply, the capacity of the hot water storage tank is reduced so that the hot water heater can be easily installed in a general household.

JP-A-8-5145 Japanese Patent Laid-Open No. 2004-20124 Japanese Patent Laid-Open No. 2005-9724

  In the hot water supply system described in Patent Document 1 or 2, when the amount of hot water used is increased due to a change in the family structure after the installation of a hot water heater or the like, a hot water storage tank is added to cope with the increase in the amount of hot water supply. Is described. However, in the hot water supply systems described in these publications, since an additional tank is additionally installed using a new connection pipe, the connection that connected the hot water storage tank of the main unit and the circulation pipe before the expansion was made. A pipe becomes unnecessary and a waste of piping material arises. In addition, it is necessary to loosen the connection part of the pipe when expanding, but if the position of the connection part is too close to the ground or very high, the workability is lowered. In particular, since it is arranged outdoors, it is important to secure a working space when it is arranged using a small space such as under the eaves. In Patent Document 3, a hot water storage operation function is added every time, so that installation of a large tank is not required. However, when a large capacity of hot water is required in a short time, such a demand is met due to insufficient tank capacity. The inability to respond is not considered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to make it possible to cope with an increase in the number of hot water storage tanks in a hot water storage type hot water supply apparatus. At that time, piping materials should not be wasted.

  In order to achieve the above object, the present invention provides a hot water supply apparatus having a hot water storage tank for storing hot water boiled in a hot water heating section, and a water supply pipe for supplying water to the hot water storage tank is disposed below the hot water storage tank, When one end side of the first connection pipe is connected to the lower part of the hot water storage tank and the other end side of the first connection pipe is selectively connected to the water supply pipe and a pipe other than the water supply pipe, The other end side is displaced with one end side of the connecting pipe as a base point.

  And in this structure, the 2nd connection pipe which can connect the other end side of a 1st connection pipe and a water supply pipe is provided, and the 2nd connection is made from the connection side of this 2nd connection pipe and a water supply pipe as a starting point. It is preferable that the other end side of the pipe is displaceable and a pipe other than the first connection pipe can be connected to the other end side. Moreover, it is good to have a cover member which covers the outer peripheral part of a hot water storage tank, and to make the height of the 1st connecting pipe into the height which can connect the 1st connecting pipe when the cover member is removed.

  In the above configuration, the expansion tank has an expansion tank to which the first connection pipe is connected and an expansion tank chamber formed so as to cover the outer peripheral portion of the expansion tank. The first connecting pipe may be selectively connected to the water supply pipe and a pipe other than the water supply pipe by inserting from a through hole formed in the side surface of the additional tank chamber. The first connection pipe is flexible. The first connecting pipe may be connectable to a water supply pipe or a pipe other than the water supply pipe. Furthermore, when the other end side of the first connection pipe is connected to a water supply pipe or a pipe other than the water supply pipe, the other end around the tube axis of the first connection pipe is based on one end side of the first connection pipe. The side may be displaced.

  According to the present invention, in the hot water storage type hot water supply apparatus provided with the hot water storage tank, the pipe connected to the lower side of the hot water storage tank can be selectively connected to either the hot water supply pipe and the hot water supply pipe or the water supply pipe of the expansion tank. Therefore, when adding an additional tank, the work is easy and the piping material is not wasted. Further, when an additional tank is not required, it can be used as it is as a water supply pipe, and a new pipe becomes unnecessary.

  Several embodiments of the hot water storage type hot water supply apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a system diagram showing an embodiment of a hot water storage type hot water supply apparatus. The hot water storage type hot water supply apparatus is a heat pump water heater 10 and includes a heat pump refrigerant circuit 100 and a hot water supply circuit 500. FIG. 2 is a perspective view of the heat pump water heater 10 shown in FIG. In addition, although not shown in figure, the heat pump water heater 10 has an operation control means.

The heat pump refrigerant circuit 100 is a two-cycle system and has two parts. The compressors 101 and 102 that compress the refrigerant into high-temperature and high-pressure fluids, the water-refrigerant heat exchanger (water heater) 120 that heats the water with the heat of the refrigerant heated by the compressors 101 and 102, the expansion valve The decompression devices 105 and 106 configured by the above and the air refrigerant heat exchangers 107 and 108 for exchanging heat between the ambient air and the refrigerant are sequentially connected via a refrigerant pipe. The water-refrigerant heat exchanger 120 has refrigerant-side heat transfer tubes 103 and 104. A refrigerant such as carbon dioxide is enclosed in the refrigerant side pipe of the heat pump refrigerant circuit 100.

The water-refrigerant heat exchanger (water heater) 120 includes water supply side heat transfer tubes 206 and 207 in addition to the refrigerant side heat transfer tubes 103 and 104. Refrigerant side heat transfer tubes 103 and 104 and water supply side heat transfer tubes 206,
207 is arranged so that the flow of each other is a counter flow, and the heat of the refrigerant is received by the water supply to exchange heat. These also act as a water heater of the hot water supply circuit 500.

  The hot water supply circuit 500 includes a direct hot water supply circuit 200, a tank hot water supply circuit 300, and a hot water storage circuit 400, which will be described in detail later. The direct hot water supply circuit 200 is a circuit that directly supplies hot water heated by the heat pump refrigerant circuit 100. The direct hot water supply circuit 200 includes a water supply port 201 and a water supply pressure reducing valve 202, a water supply amount sensor 203, water supply pipes 311, 313, an in-machine circulation check valve 204, a water heat exchange amount sensor 205, and a water supply side heat transfer pipe. 206, 207, a tank heat exchange mixing valve 208, a hot water mixing valve 209, a hot water supply flow rate adjustment valve 210, a hot water supply port 211 including a hot water supply fitting, and the like are sequentially connected by a water pipe. The water supply port 201 is connected to a water supply source such as a water supply, and the hot water supply port 211 is connected to a kitchen or bath faucet.

  The tank hot water supply circuit 300 is a circuit that supplies hot water stored in the hot water storage tank 401. When the hot water storage circuit 400 described later in detail is operated, hot water is stored in the hot water storage tank 401. The tank hot water supply circuit 300 includes a water supply port 201 and a water supply pressure reducing valve 202 made of a water supply fitting, a water supply amount sensor 203, a water supply pipe 311, a water supply pipe 312, a water supply pipe 314, a first connection pipe 321, a hot water storage tank 401, a hot water tank 401, A pipe 361, a tank heat exchange mixing valve 208, a hot and cold mixing valve 209, a hot water supply flow rate adjusting valve 210, a hot water supply port 211 including a hot water supply fitting, and the like are sequentially connected by a water pipe.

  The hot water storage circuit 400 is a water circuit for storing hot water having a preset predetermined temperature in the hot water storage tank 401. The hot water storage circuit 400 includes a hot water storage tank 401, a first connection pipe 321, a water supply pipe 314, a water supply pipe 315, an in-machine circulation pump 501, a water heat exchange amount sensor 205, a water supply side heat transfer pipes 206 and 207, and a tank heat exchange mixing valve 208. , A hot water outlet pipe 361 and a hot water storage tank 401, which are sequentially connected by a water pipe.

  Operation control means (not shown) controls the above circuits. For example, when using hot water by opening a kitchen faucet (not shown) connected to the hot water supply port 211, the operation control means starts the compressors 101 and 102 based on the output of the water supply water amount sensor 203. And the operation of the heat pump refrigerant circuit 100 is started. At the same time, the operation of the direct hot water supply circuit 200 is started. Furthermore, the operation of the tank hot water supply circuit 300 is started simultaneously.

  The heat pump refrigerant circuit 100 supplies the refrigerant, which has been compressed by the compressors 101 and 102, to a high temperature to the refrigerant side heat transfer tubes 103 and 104 of the water refrigerant heat exchanger (water heater) 120, and supplies the water supply side heat transfer tubes 206 and 207. The water flowing in is heated and led to the hot water supply port 211 side. At the time of start-up immediately after operating the heat pump refrigerant circuit 100, the refrigerant supplied to the water refrigerant heat exchanger 120 has not risen to the required high temperature, and the entire water refrigerant heat exchanger 120 has cooled down. In the refrigerant heat exchanger 120, the ability to heat water by the refrigerant is insufficient. As a result, immediately after the heat pump refrigerant circuit 100 is operated, the hot water temperature is lower than a general hot water supply temperature, for example, 42 ° C.

In order to compensate for this lack of hot water supply capacity, a hot water storage tank 401 for storing hot water at a temperature higher than a general hot water supply temperature, for example, 60 to 90 ° C., is provided. Then, the hot hot water stored in the hot water storage tank 401 is led from the hot water discharge pipe 361 to the tank heat exchange mixing valve 208 by operating the tank hot water supply circuit 300. Then, the tank heat exchange mixing valve 208 is mixed with hot water that does not reach the predetermined temperature supplied from the hot water supply circuit 200 directly. Further, the hot water mixing valve 209 mixes with the water supplied from the water supply port 201, reduces the hot water temperature to a predetermined temperature, for example, about 42 ° C., and supplies it from the hot water supply port 211.

  By the way, the capacity of the hot water storage tank 401 is generally about 30 to 100 liters. This is because the heat pump water heater 10 is intended to be installed at home, and the heat pump water heater 10 can be installed even when only a small space is available. After the heat pump water heater 10 is installed, if the family structure changes or the amount of hot water used increases, the convenience can be further increased by installing additional tanks 402 to 405. In FIG. 1, the extension tanks 402 to 405 are indicated by virtual lines.

  An example in which an expansion tank is attached to cope with an increase in the amount of hot water used will be described with reference to FIGS. FIG. 3 is a cross-sectional view taken along the line AA in FIG. The hot water storage type hot water supply device 90 includes a hot water storage type hot water supply device 60 and an extension unit 80. The hot water storage type water heater 60 and the extension unit 80 are fixed by a plurality of fixtures 91 so as to be attached and detached. The hot water storage type water heater 60 is covered with a substantially rectangular parallelepiped casing 61, and the casing 61 is divided by a partition member 71 into an air cooling chamber 62 side having air circulation ports 64 and 65 and a tank chamber 70 side. It is partitioned.

In the air cooling chamber 62, the air refrigerant heat exchangers 107 and 108 and the air refrigerant heat exchanger 107,
A fan 63 with a fan motor that forcibly ventilates 108 is installed. In the tank chamber 70, a water / refrigerant heat exchanger (water heater) 120 and a water supply pressure reducing valve 202, an in-machine circulation check valve 204, a hot water storage tank 401, first connection pipes 321 and 333, and a second connection pipe 331 are provided. A connecting portion 332, a water supply pipe 314, a freeze prevention heater 76, and an operation panel 75 are installed.

The water supply pressure reducing valve 202 and the in-machine circulation check valve 204, the first connection pipes 321 and 333, the second connection pipe 331, the connection portion 332, and the water supply pipe 314 provided in the tank chamber 70 are connected to the hot water storage tank 401 and water. It is installed in the vicinity of the hot water storage tank 401 and the water refrigerant heat exchanger 120 so that the heat of the refrigerant heat exchanger 120 acts. That is, using the hot water of the hot water storage tank 401 and the water refrigerant heat exchanger 120, the water supply pressure reducing valve 202, the in-machine circulation check valve 204, the first connection pipes 321 and 333, the second connection pipe 331, and the connection portion 332, water supply pipe 314 and the like are prevented from freezing. Thereby, the electricity supply rate of the voltage applied to the freeze prevention heater 76 provided for freeze prevention can be made small.

  In order to connect a pipe communicating with a water supply source such as a water supply to the water supply port 201, a connection work opening 72 is formed in the front portion of the tank chamber 70 of the housing 61. A cover member 73 for closing the connection work opening 72 is provided on the front surface of the connection work opening 72 so as to be detachable. The position and height of the first connection pipe 321 or the positions and heights of the first connection pipe 333 and the second connection pipe 331 described later are such that the connection work can be performed when the cover member 73 is removed. To do. That is, when the expansion tanks 402 to 405 are added, the connection work opening 72 and the through hole 92 are provided at a position and height where the pipe connection work can be easily performed. Here, the position and height at which the pipe connection work can be easily performed are, for example, below the bottom of the hot water storage tank 401, and are put in the hand when the rotatable connection pipes 331 and 333 are rotated by hand. It is about 10 cm high enough to accommodate an average adult male hand.

  An expansion tank 405 is optionally attached so that the capacity of the hot water storage tank 401 can be increased. The expansion tank 405 is installed in the expansion enclosure 81 of the expansion unit 80. On the front surface of the additional enclosure 81, the first and second connection pipes 336 (see FIG. 11) and the second connection pipe 334 (see FIG. 11) are located at positions where the connection portions are visible. A connection work opening 82 is formed so that the attachment / detachment work of the connection parts of the connection pipes 336 and 334 is possible. A removable cover member 83 is attached to the front surface of the connection work opening 82. A through hole 92 is formed in the side surface of the main unit casing 61 or the additional casing 81 so that piping can pass therethrough.

  With reference to FIG. 4, a state in which a water supply pipe and a hot water supply pipe to the hot water storage tank 401 provided in the above embodiment are provided will be described. FIG. 4 is a front view of the hot water storage tank 40 part. A water supply pipe 314 for supplying water from a water supply port 201 such as a water supply is disposed below the hot water storage tank 401. During operation of the tank hot water supply circuit 300, water is supplied from the water supply pipe 314 to the hot water storage tank 401. Between the water supply pipe 314 and the hot water storage tank 401, a substantially L-shaped first connection pipe 321 that connects the water supply pipe 314 and the hot water storage tank 401 is disposed. When the hot water storage type hot water heater 60 (see FIG. 2) is used alone, the upper end of the first connecting pipe 321 is connected to the lower end of the hot water storage tank 401 at the one end 321c side, and the lower end at the other end is connected. Connect to the water supply pipe 314. A tank hot water supply circuit 300 (see FIG. 1) extending from the water supply pipe 314 to the hot water supply port 211 (see FIG. 1) via the hot water storage tank 401 is formed.

When the first connection pipe 321 is connected, if the first connection pipe 321 has flexibility such as an accordion shape, the connection end 321c is fixed even if the connection end 321c with the hot water storage tank 401 is fixed. As a base point, the end 321e side which is a free end is displaced, and a pipe other than the water supply pipe 314, for example, a hot water pipe 365 (see FIG. 5) can be connected to the end 321e of the first connection pipe 321. Further, if the first connecting pipe 321 is a rigid structure such as a normal pipe bent, the connecting portion with the hot water storage tank 401 is connected with a locking tool 376 or the like which will be described later. By loosening, if the first connecting pipe 321 is rotated around its pipe axis, it can be connected to pipes other than the water supply pipe 314.

  More specifically, one end 321c that extends in a substantially L-shape toward the water supply pipe 314 side, removes only the connection portion 342 of the first connection pipe 321 located at the left position 321a, and is connected by a locking tool 376. The free end 321e disconnected by the connecting portion 342 is displaced or rotated to the right position 321b indicated by the phantom line with the end portion 321c as a base point. As a method of displacing the free end which is the other end 321e with the one end 321c side as a base point, the above-described method of rotating the other end 321e around the one end 321c or the first connecting pipe 321 itself is flexible. It is not restricted to the method of changing the distance dimension of the one end 321c and the other end 321e using bending by flexibility.

  When the first connection pipe 321 reaches the right side position 321b, the free end 321e of the first connection pipe 321 is placed in the vicinity of the through hole 92 provided in the side surface of the casing 61 of the hot water storage hot water supply device 60. Position. Since the free end 321e is positioned at this position and height, the hot water outlet pipe 365 (see FIG. 5) can be easily attached and detached without removing other parts of the hot water storage type hot water heater 60. The through hole 92 is closed with a bush 95.

  The manner in which the expansion tank 405 is provided in addition to the hot water storage tank 401 for some reason will be described with reference to FIG. FIG. 5 is a front view of the hot water storage tank 401 section. In accordance with the procedure shown in FIG. 4, the first connection pipe 321 is removed from the water supply pipe 314 at the connection portion 342. Then, the first connection pipe 321 is rotated with the connection end 321c to the hot water storage tank 401 as a base point. In this embodiment, the first connecting pipe 321 is rotated from the left position 321a to the right position 321b by rotating 180 degrees. The free end 321 e of the first connection pipe 321 is connected to the hot water discharge pipe 365 of the expansion tank 405. The tank inlet pipe 355 of the expansion tank 405 is connected to the water supply pipe 314 from which the first connection pipe 321 is removed. As described above, even when the extension unit 80 (see FIG. 2) having the extension tank 405 is added, the extension work is facilitated. In addition, all the existing pipes can be used effectively at the time of expansion, and new pipes for replacing the existing pipes are unnecessary.

  A through hole 92 is formed in the side surface of the case 61 and the additional case 81 of the hot water storage type hot water heater so as to allow the tank inlet pipe 355 and the hot water outlet pipe 365 to pass therethrough. The tank inlet pipe 355 and the hot water outlet pipe 365 are inserted into the tank chamber 70 from the through hole 92. This makes it possible to easily connect the pipes using the connection work opening 72 described with reference to FIG.

  When the tank hot water supply circuit 300 is operated after adding the expansion tank 405, the water supplied from the water supply port 201 (see FIG. 1) flows in the direction of the arrow k2 in the figure. In this case, since the expansion tank 405 side is supplied first, the relatively low temperature water supplied from the water supply port 201 (see FIG. 1) flows into the lower part of the expansion tank 405 and is temporarily stored in the expansion tank 405. Is done. The hot water remaining in the upper portion of the expansion tank 405 pushed out by the water supplied from the water supply port is supplied to the hot water storage tank 401.

Here, since the hot water in the upper part of the expansion tank 405 reaches 60 to 90 ° C., for example, this hot hot water is supplied to the hot water storage tank 401 through the hot water outlet pipe 365, so that the temperature drop on the hot water storage tank 401 side is reached. Can be suppressed. Thereby, also in a present Example, the electricity supply rate of the voltage applied to the antifreezing heater 76 (refer FIG. 2) can be made small.

Details of the pipe connecting portion at the lower part of the hot water storage tank 401 will be described with reference to the longitudinal sectional view of the piping portion shown in FIG. 6 and the perspective view of the locking tool 376 shown in FIG. A connection fitting 375 is attached to the bottom of the hot water storage tank 401. The connection fitting 375 is screwed with a connection fitting 374 provided at the end of the substantially L-shaped first connection pipe 321. At that time, the first connecting pipe 321 is rotatable with the end 321c of the first connecting pipe 321 as a base point. That is, when the connecting portion 342 is removed, the first connecting pipe 321 can rotate from the connecting pipe position 321a indicated by the dotted line to the connecting pipe position 321b indicated by the solid line.

A connection fitting 371 is provided at the free end 321e of the first connection pipe 321 from which the connection 342 has been removed. As is apparent from the figure, the connection fitting 371 can be selectively attached to the connection fitting 372 provided at one end 314e of the water supply pipe 314 and the connection fitting 372 provided at one end 365e of the hot water discharge pipe 365. In order to maintain airtightness with the connection fittings 371 and 372, a seal ring 373 is disposed between the connection fittings 371 and 372. The first connection pipe 321 can be rotated with one end 321c as a base point, and the other end 321e of the first connection pipe 321 is a pipe other than the water supply pipe 314 and the water supply pipe 314, for example, a hot water pipe 365 (see FIG. 5). ) Can be selectively connected.

  In order to prevent the connection part 342 from being disconnected due to an external force or the like, a locking tool 376 that holds the connection part metal parts 371 and 372 is disposed on the outer peripheral side of the connection part metal parts 371 and 372. As shown in FIG. 7, the locking tool 376 has a locking portion 376 b of the connection fitting 371 and a locking portion 376 a of the connection fitting 372 and has elasticity. The locking tool 376 is integrally formed of a spring steel plate or the like. The locking tool 376 can be removably inserted into the connection portion 342 from the opening 376c.

In the present embodiment configured as described above, a water supply pipe 314 for supplying water to the hot water storage tank 401 is disposed below the hot water storage tank 401, and a first connection pipe 321 having one end connected to the bottom of the hot water storage tank 401 is provided. Since the other end 321e can be displaced with the one end 321c of the first connection pipe 321 as a base point, the other end 321e of the first connection pipe 321 can be connected to a pipe other than the water supply pipe 314. As a result, when the hot water storage type hot water heater 60 is used alone, if the anti-hot water storage tank end 321e of the first connection pipe is connected to the water supply pipe 314, the hot water supply pipe 314 is connected to the hot water supply port 211 via the hot water storage tank 401. The tank hot water supply circuit 300 can be formed. Further, when adding the extension unit 80 having the extension tank 405, it is only necessary to remove the connection portion 342 and connect the pipe of the tank to be added to the connection portion 342. Can be used effectively.

  According to the present embodiment, the position and height of the first connecting pipe 321 can be adjusted so that the pipe connecting work can be performed when the cover member 73 that closes the opening 72 for connecting the water supply port is removed. Therefore, it is easy to connect an expansion pipe for the expansion tank 405. Further, since the hot water outlet pipe 365 and the tank inlet pipe 355 of the additional tank are inserted from the through holes 92 provided in the side surface of the tank chamber so that the connection work can be performed from the connection work opening 72, the hot water discharge pipe 365 and the tank inlet pipe are provided. Attachment and removal work with the tube 355 is facilitated.

  Another embodiment of the hot water storage type hot water supply apparatus according to the present invention will be described with reference to FIGS. FIG. 8 shows a front view of the hot water storage tank 401 section. FIG. 9 is a front view of a hot water storage tank 401 having an additional tank 402. FIG. 8A shows the pipe connection state during normal operation, and FIG. 8B shows the pipe connection state when a part of the pipe is removed.

Under the hot water storage tank 401, a tank inlet pipe 351 and a water supply pipe 3 for supplying water from the water supply port 201 (see FIG. 1) to the hot water storage tank 401 when the tank hot water supply circuit 300 is operated are disposed. Between the water supply pipe 314 and the tank inlet pipe 351, a first connection pipe 333 and a second connection pipe 331 that connect the water supply pipe 314 and the tank inlet pipe 351 are provided.

A removable connecting portion 332 is provided between the first connecting pipe 333 and the second connecting pipe 331. The position of the connection part between the second connection pipe 331 and the first connection pipe 333 can be displaced simply by removing the connection part 332. The connection portion 332 includes a connection member 332a on the second connection pipe 331 side and a connection member 332b on the first connection pipe 333 side. If the connecting portion 332 is removed and the first connecting pipe 333 is rotated 180 ° about the tank inlet pipe 351 as shown in FIG. 8B, the left position 333a moves to the right position 333b. To do. That is, the piping of the additional tank 402 (see FIG. 9) can be connected to the connecting portion 332a of the second connecting pipe and the connecting portion 332b of the first connecting pipe simply by removing the connecting portion 332.

  When the first connection pipe 333 is moved to the position 333b on the right side, the connection portion 332b is positioned in the vicinity of the through hole 93 provided on the side surface of the casing 61 of the hot water storage type hot water heater 60. A tapping pipe 362 (see FIG. 9) is detachably attached to the connecting portion 332b. And the connection part 332b is positioned so that it may become a position and height suitable for this attachment / detachment work. Note that the through-hole 93 is covered with a bush 96 except during work.

The manner in which the expansion tank 402 is attached to the hot water storage tank 401 will be described with reference to FIG. In the state of FIG. 8A, the connecting portion 332 is removed, and the second connecting pipe 331 is rotated by 180 ° around the pipe axis of the water supply pipe 314 to move from the upper position 331a to the lower position 331b. . The tank inlet pipe 352 of the expansion tank 402 is connected to a connection portion 332a provided at the free end located at the right end of the lower position 331b. At this time, in the state of FIG. 8A, the connecting portion 332 is removed, and the first connecting pipe 333 is rotated 180 ° around the pipe axis of the tank inlet pipe 351. The first connecting pipe 333 moves from the left position 333a to the right position 333b. The hot water discharge pipe 362 of the expansion tank 402 is connected to the connection portion 332 b provided at the free end of the first connection pipe 333.

  That is, in the state of FIG. 8A, the second connection pipe 331 and the first connection pipe 333 are connected to the tank inlet pipe 352 of the expansion tank 402 and the other connection section 332 by simply removing the connection section 332 while leaving the other connection sections as they are. The hot water pipe 362 can be connected. As a result, even if the expansion tank 402 is added, the existing pipe can be used effectively, and there is no need to use a new pipe instead of the existing pipe.

Here, in order to allow the tank inlet pipe 352 and the hot water outlet pipe 362 to pass therethrough, through holes 93 and 94 are formed in the side surfaces of the casing 61 and the additional casing 81 of the hot water storage type hot water heater 60. From the through holes 93 and 94, the hot water outlet pipe 362 and the tank inlet pipe 352 are inserted into the tank chamber 70. Thereby, the connection work of piping is attained using the opening 72 for connection work (refer FIG. 3). Therefore, when the expansion tank 402 is expanded, the through holes 93 and 94 are provided at positions and heights at which the piping connection work for expansion is facilitated. The through holes 93 and 94 are closed with bushes 96 and 97 except during work.

  In the present embodiment, when the tank hot water supply circuit 300 is operated after adding the expansion tank 402, the water supplied from the water supply port 201 (see FIG. 1) flows according to the arrow k1. That is, since water is supplied first from the expansion tank 402 side, the relatively low temperature water supplied from the water supply port 201 flows into the lower part of the expansion tank 402 and is temporarily stored in the expansion tank 402. Then, hot water staying in the upper part of the expansion tank 402 pushed out by water supply, for example, hot water of 60 to 90 ° C. is supplied to the hot water storage tank 401 from the hot water discharge pipe 362. A temperature drop on the hot water storage tank 401 side can be suppressed. Also in this case, the energization rate of the voltage applied to the freeze prevention heater 76 (see FIG. 2) can be reduced.

  According to the present embodiment, the second connection pipe 331 is provided between the connection portion 332 b that is the free end of the first connection pipe 333 and the water supply pipe 314, and the water supply pipe 314 side of the second connection pipe 331 is provided. Since the connection portion 332a provided on the opposite end side with the end portion as a base point can be displaced, the connection portion 332a can be selectively connected to the first connection pipe 333 and the tank inlet pipe 352 of the additional tank. Further, when the expansion tank 402 is added, the pipes 352 and 362 of the expansion tank 402 can be connected to the connection portion 332 (332a and 332b) simply by removing the connection portion 332 (332a and 332b). As a result, the process of expansion work can be reduced, and a new pipe that replaces the existing pipe becomes unnecessary.

  According to the present embodiment, the position and height of the first connection pipe 333 and the second connection pipe 331 can be easily connected when the cover member 73 that closes the connection work opening 72 is removed. Since it is at the position and height, the piping connection work when adding the expansion tank 402 or the like becomes easy. The additional tank outlet pipe 362 and the tank inlet pipe 352 are inserted through the through holes 93 and 94 formed in the side surface of the tank chamber 70, and the connection work can be performed using the connection operation opening 72. The attachment / detachment work of the inlet pipe 352 is facilitated.

  According to the present embodiment, both the second connection pipe 331 and the first connection pipe 333 can be displaced at the other end side while the one end side is substantially fixed. The distance L3 with the tube 362 can be set arbitrarily. Since the through holes 93 and 94 through which the tank inlet pipe 352 and the hot water outlet pipe 362 pass can be set to simple circular holes, the drilling work is facilitated.

  Still another embodiment of the hot water storage type hot water supply apparatus according to the present invention will be described with reference to FIGS. 10 and 11 are front views of a hot water storage tank 401 and an additional tank 402 provided in the hot water storage type hot water supply apparatus 10. In FIG. 11, there are two hot water storage tanks to be added. In the present embodiment, as in the embodiment shown in FIG. 9, after the expansion tank 403 is disposed, the expansion tank 404 is further added to the expansion tank 403. However, unlike the embodiments shown in FIGS. 8 and 9, the piping structure at the bottom of the expansion tank 403 is the same as the piping structure at the bottom of the hot water storage tank 401 so that a new expansion tank 404 can be added. Yes. Further, the piping structure at the bottom of the expansion tank 404 can be adapted to further expansion in the same manner as the piping structure at the bottom of the hot water storage tank 401.

  At the bottom of the additional tank 403, a tank inlet pipe 353 for guiding the water supplied from the water supply port 201 (see FIG. 1) and a connecting pipe 381 connected to the water supply pipe 314 are disposed. Between the connecting pipe 381 and the tank inlet pipe 353, a second connecting pipe 334 and a first connecting pipe 336 are disposed. A detachable connection portion 335 is provided between the second connection pipe 334 and the first connection pipe 336. By simply removing the connection portion 335, the positions of the connection portions of the second connection pipe 334 and the first connection pipe 336 can be displaced. The connecting portion 335 includes a member 335a on the second connecting pipe 334 side and a member 335b on the first connecting pipe 336 side.

  If only the connecting portion 335 is removed while the other connecting portions are fixed, the first connecting pipe 336 can be rotated around the tube axis of the tank inlet pipe 353 as shown in FIG. The first connecting pipe 336 is rotated 180 ° and moved from the left position 336a to the right position 336b. The piping of the additional tank 404 (see FIG. 11) can be connected to the connecting portion 335a of the second connecting pipe and the connecting portion 335b of the first connecting pipe simply by removing the connecting portion 335.

In FIG. 10, the connection part 335 of the second connection pipe 334 is removed, and the second connection pipe 334 is rotated 180 degrees around the pipe axis of the connection pipe 381 with the connection part with the connection pipe 381 as a base axis. Then, in FIG. 11, the second connecting pipe 334 moves from the upper position 334a in the figure to the lower position 334b in the figure. In this state, the connecting pipe 382 connected to the expansion tank 404 is connected to the connecting portion 335a on the free end side.

At this time, the connection part 335 of the first connection pipe 336 is removed, and the first connection pipe 336 is rotated 180 degrees around the pipe axis of the tank inlet pipe 353 with the connection part with the tank inlet pipe 353 as a base axis. In FIG. 11, the first connecting pipe 336 moves from a position 336a on the left side of the drawing to a position 336b on the right side of the drawing. The hot water discharge pipe 364 of the expansion tank 404 is connected to the connection portion 335b which is the free end side of the first connection pipe 336.

  Similarly, a tank inlet pipe 354 and a connecting pipe 382 are also provided at the lower part of the second expansion tank 404, and the intermediate pipe can be attached and detached between the connecting pipe 382 and the tank inlet pipe 354. A second connection pipe 337 and a first connection pipe 339 each having a connecting portion 338 are provided. Therefore, it is possible to easily add an additional tank simply by removing the connecting portion 338.

  According to the present embodiment, the connection portion positions 335a and 335b of the second connection pipe 334 and the first connection pipe 336 provided at the lower part of the expansion tank 403 can be removed, and the positions can be changed after the removal. Since it did in this way, the expansion tank 404 can be expanded further in a connection part. As a result, when the expansion tank 404 is expanded, it is possible to easily connect the piping of the tank to be expanded by simply removing the connecting portion, and the expansion work is simple and there is no need to use new piping for changing the piping. If the second connecting pipes 334 and 337 or the first connecting pipes 336 and 339 are set to the same size, or if the connecting pipes 381 and 382 are set to the same size, standardization of parts is possible. Therefore, the manufacturing cost can be reduced.

Still another embodiment of the hot water storage type hot water supply apparatus 10 according to the present invention will be described with reference to FIG. In FIG. 12, the lower part of the hot water storage tank 401 of the hot water storage type hot water supply apparatus 10 is shown in cross section. The tube portion 340a of the first connection tube 340 is formed in, for example, a flexible bellows tubular shape. When the first connecting pipe 340 is connected to the water supply pipe 314 indicated by the dotted line, the connecting portion position 341a is located on the left side, and when connected to the hot water outlet pipe 365 indicated by the solid line, the connecting portion position 341b. Is on the right. At this time, when the connection position 341a changes to the connection position 341b, the change angle Θx of the first connection pipe 340 is about 30 ° to 200 °. Since the first connection pipe 340 has flexibility, even if the connection position changes in this way, it can be easily connected at any position. Even if the distances L1 and L2 from the connection fitting 377 provided at the tip of the tank inlet pipe 351 change by several tens of percent, the first connection pipe 340 has flexibility, so the distance can be increased or decreased. Can also respond.

  According to the present embodiment, since the tube portion of the first connection pipe 340 is a flexible bellows tube, the position of the connection portion of the first connection tube 340 can be easily changed, and an expansion tank or the like can be installed. When expanding, the likelihood of the installation position of the expansion tank increases. In addition, the expansion work of the expansion tank becomes easy and the existing piping can be used, so there is no need to prepare new piping for expansion.

1 is a system diagram showing a schematic configuration of an embodiment of a hot water storage type hot water supply apparatus according to the present invention. It is a perspective view of the hot water storage type hot-water supply apparatus shown in FIG. It is AA arrow sectional drawing in FIG. It is a figure explaining piping connection of the hot water storage tank which the hot water storage type hot-water supply apparatus shown in FIG. 1 has. It is a figure explaining piping connection of the extension tank which the hot water storage type hot-water supply apparatus shown in FIG. 1 has. It is a figure explaining the connecting pipe which the hot water storage type hot-water supply apparatus shown in FIG. 1 has. It is a perspective view of the locking tool which the hot water storage type hot-water supply apparatus shown in FIG. 1 has. It is a figure explaining the piping connection of the other Example of the hot water storage tank with which the hot water storage type hot water supply apparatus which concerns on this invention is provided. It is explanatory drawing of the piping connection of the other Example of the expansion tank with which the hot water storage type hot-water supply apparatus which concerns on this invention is provided. It is a figure explaining the piping connection of the further another Example of the hot water storage tank with which the hot water storage type hot-water supply apparatus which concerns on this invention is equipped, and an expansion tank. It is a figure explaining the piping connection in the further another Example of the expansion tank with which the hot water storage type hot-water supply apparatus which concerns on this invention is provided. It is a figure explaining the piping connection of the other Example of the connecting pipe with which the hot water storage type hot-water supply apparatus concerning this invention is provided.

Explanation of symbols

60 Hot water storage type water heater 61 Hot water storage type water heater housing 62 Air cooling chamber 63 Fan motor-equipped fan 64, 65 Air circulation port 70 Tank chamber 71 Partition member 72, 82 Connection work opening 73, 83 Cover member 75 Operation panel 76 Freezing Prevention heater 80 Additional unit 81 Additional housing 90 Hot water storage type hot water supply device 91 Fixture 92-94 Through hole 95-97 Bush 100 Heat pump refrigerant circuit 101, 102 Compressor 103, 104 Refrigerant side heat transfer tube 105, 106 Depressurization device 107, 108 Air refrigerant heat exchanger 120 Water refrigerant heat exchanger (water heater)
200 Direct Hot Water Supply Circuit 201 Water Supply Port 202 Water Supply Pressure Reduction Valve 203 Water Supply Water Quantity Sensor 204 In-machine Circulation Check Valve 205 Water Heat Exchange Amount Sensor 206, 207 Water Supply Side Heat Transfer Tube 208 Tank Heat Exchange Mixing Valve 209 Hot Water Mixing Valve 210 Hot Water Supply Flow Control Valve 211 Hot water supply port 300 Tank hot water supply circuits 311 to 315 Water supply pipes 321, 333, 336, 339, 340 First connection pipe 331, 334, 337 Second connection pipe 332, 335, 338, 341, 342 Connection part 351 to 355 Tank inlet pipes 361 to 365 Hot water outlet pipes 371, 372, 374, 375 and 377 Connection fitting 373 Seal ring 376 Locking tool 381 and 382 Connection pipe 400 Hot water storage circuit 401 Hot water storage tanks 402 to 405 Additional tank 500 Hot water supply circuit 501 In-machine circulation pump

Claims (6)

  In the hot water supply apparatus having a hot water storage tank for storing hot water boiled in the hot water heating section, a water supply pipe for supplying water to the hot water storage tank is disposed below the hot water storage tank, and a first connection pipe is provided below the hot water storage tank. When one end side is connected and the other end side of the first connection pipe is selectively connected to the water supply pipe and a pipe other than the water supply pipe, the other end side with the one end side of the first connection pipe as a base point A hot water storage type hot water supply device characterized by displacing the water.   A second connection pipe that can connect the other end side of the first connection pipe and the water supply pipe is provided, and the connection side of the second connection pipe and the water supply pipe serves as a base point of the second connection pipe. The hot water storage type hot water supply apparatus according to claim 1, wherein the other end side can be displaced, and a pipe other than the first connection pipe can be connected to the other end side.   A cover member that covers an outer peripheral portion of the hot water storage tank; and the height of the first connection pipe is set to a height that enables the connection of the first connection pipe when the cover member is removed. The hot water storage type hot water supply apparatus according to claim 1, wherein   An expansion tank to which the first connection pipe is connected and an expansion tank chamber formed so as to cover an outer peripheral portion of the expansion tank, and a hot water outlet pipe and a tank inlet pipe provided in the expansion tank are connected to the expansion tank. The hot water storage system according to claim 1, wherein the hot water storage system is inserted through a through hole formed in a side surface of the chamber, and the first connection pipe can be selectively connected to the water supply pipe and a pipe other than the water supply pipe. Hot water supply device.   2. The first connecting pipe according to claim 1, wherein the first connecting pipe has a flexible bellows tubular portion, and the first connecting pipe can be connected to the water supply pipe or a pipe other than the water supply pipe. Hot water storage water heater. When the other end side of the first connection pipe is connected to the water supply pipe or a pipe other than the water supply pipe, the other end around the pipe axis of the first connection pipe starts from the one end side of the first connection pipe. The hot water storage type hot water supply apparatus according to claim 1, wherein the side is displaced.

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