JP5609274B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water heater including a plurality of hot water storage tanks connected in series.

  2. Description of the Related Art There is known a hot water storage type hot water heater that includes a plurality of hot water storage tanks, and these hot water storage tanks are connected in series via a connecting pipe. Generally, a hot water storage tank of a hot water storage type hot water heater is always kept in a full state with low temperature water stored on the lower layer side and high temperature water stored on the upper layer side. However, it may be necessary to discharge the water in the hot water storage tank for inspection or the like. For this reason, the hot water storage type water heater is provided with a drain valve that opens when the water in the hot water storage tank is discharged.

  In the following Patent Document 1, in a hot water storage type water heater provided with a plurality of hot water storage tanks connected in series, the other ends of the drain pipes each connected to the lower part of each hot water storage tank are joined together, The structure which arrange | positions one drain valve and arrange | positions an air intake valve in the hot water storage tank upper part is disclosed. In this hot water storage type hot water heater, when water in a plurality of hot water storage tanks is discharged, the air intake valve is first opened and then the drain valve is opened. Thereby, since the air which flowed in from the air intake valve flows into the upper part of a hot water storage tank, the water in a several hot water storage tank can be discharged | emitted smoothly simultaneously.

  In Patent Document 2, an air intake valve is provided at the upper part of the hot water storage tank, a drainage valve is arranged at the lower part of the hot water storage tank by joining pipes, and a plurality of hot water storage tanks are switched by switching the three-way valve arranged in the middle of the pipe. The structure which can discharge | emit the water in a tank simultaneously is disclosed.

JP 2007-247955 A (5th page, FIG. 1) Japanese Patent Laying-Open No. 2005-76975 (page 8, FIG. 1)

  If the air intake valve is arranged at the upper part of the hot water storage tank as in the conventional technique described above, the height of the product becomes high, which may cause inconvenience in transportation and installation. Further, when the air intake valve is opened or a negative pressure is applied during a time other than the draining operation, air may enter the hot water storage tank from the air intake valve. In addition, when performing the drainage operation, the operation for opening the air intake valve must be performed separately from the operation for opening the drainage valve, so the work is complicated. If you forget to open the air intake valve, it will not be drained smoothly and the drainage time will be longer.

  The present invention has been made to solve the above-described problems, and can quickly drain water from a plurality of hot water storage tanks during a draining operation, and allows air to flow into the hot water storage tanks other than during the draining operation. It is an object of the present invention to provide a hot water storage type water heater capable of reliably preventing the product height and suppressing the product height.

A hot water storage type water heater according to the present invention includes a plurality of hot water storage tanks connected in series by connecting an upper part of a hot water storage tank and a lower part of the next hot water storage tank via a connecting pipe, and each of the plurality of hot water storage tanks A plurality of drain pipes each having one end communicating with the lower part of the pipe, a junction where the other ends of the plurality of drain pipes join, or a drain valve provided downstream of the junction, and a drain valve The air intake valve linked to the drain valve and the air taken in from the air intake valve flow into each of the hot water storage tanks from the top so that it opens when the drain valve is opened and closes when the drain valve is closed. An air inflow path that can be made to open, and when draining from a plurality of hot water storage tanks simultaneously by opening the drain valve, the air intake valve opens in conjunction with the air taken in from the air intake valve. Via inflow path Te configured to flow from the top to each of a plurality of the hot water storage tank, air inlet path is one that is configured to utilize a portion of the connection pipe to flow air into the hot water storage tank.
The hot water storage type water heater according to the present invention includes a plurality of hot water storage tanks connected in series by connecting an upper part of a hot water storage tank and a lower part of the next hot water storage tank via a connecting pipe, and a plurality of hot water storage tanks. A plurality of drain pipes each having one end communicating with each lower part, a junction part where the other ends of the plurality of drain pipes join together, a drain valve provided downstream of the junction part, and a drain valve integrally An air intake valve that operates in conjunction with the drain valve and air taken from the air intake valve is provided above each of the hot water storage tanks so that it opens when the drain valve is opened and closes when the drain valve is closed. An air inflow path that can flow in from the air, and when the drain valve is opened to simultaneously drain water from a plurality of hot water storage tanks, the air intake valve opens in conjunction with the air taken in from the air intake valve. Air inflow Via configured to flow from the top to each of a plurality of the hot water storage tank, air inlet path are those which are different paths from the expansion water drain pipe for discharging the expansion water of the hot water storage tank.

  ADVANTAGE OF THE INVENTION According to this invention, the water in a some hot water storage tank can be discharged | emitted smoothly and rapidly simultaneously only by the operation | movement which opens a drain valve. Further, since the air intake valve does not open except when the drain valve is opened, it is possible to reliably prevent air from flowing into the hot water storage tank other than during the drain operation. Moreover, since it is not necessary to provide an air intake valve in the upper part of the hot water storage tank, the product height can be suppressed.

It is a block diagram which shows Embodiment 1 of the hot water storage type water heater of this invention. It is a perspective view of the drain valve with which the hot water storage type water heater shown in FIG. 1 is provided. It is a cross-sectional perspective view in the closed state of the drain valve shown in FIG. It is a cross-sectional perspective view in the closed state of the drain valve shown in FIG. It is a cross-sectional perspective view in the open state of the drain valve shown in FIG. It is a cross-sectional perspective view in the open state of the drain valve shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing Embodiment 1 of a hot water storage type water heater of the present invention. A hot water storage type water heater 110 shown in FIG. 1 is a device that stores hot water boiled by a heat source device in a hot water storage tank and supplies the hot water from the hot water storage tank to a hot water supply destination as required. The hot water storage type hot water heater 110 of the present embodiment includes a heat pump unit 20 as a heat source device and a hot water storage tank unit 100.

  Although not shown, the heat pump unit 20 includes a compressor that compresses the refrigerant, a heating heat exchanger corresponding to a radiator, an expansion valve, an evaporator, and a circulation pipe that connects these in an annular shape. A refrigeration cycle section is provided. In this refrigeration cycle section, a refrigerant such as carbon dioxide is compressed by a compressor to become a high temperature and a high pressure, then radiates heat with a boiling heat exchanger, depressurizes with an expansion valve, absorbs heat with an evaporator, and enters a gas state. It is sucked into the compressor.

  The hot water storage tank unit 100 includes two hot water storage tanks 4 and 6 connected in series, a water supply pipe 2, a tank connection pipe 5 connecting the two hot water storage tanks 4 and 6, a hot water supply pipe 7, and an expansion water drain pipe. 9, a hot water circulation conduit 10, a drain valve 13 and the like.

  The water supply pipe 2 is a pipe that supplies water such as city water to the water-side hot water storage tank 4. In the middle of the water supply pipe 2, a pressure reducing valve 3 is provided. The pressure reducing valve 3 reduces the water pressure from a water source (not shown) such as a water supply to a predetermined value or less. The water supply pipe 2 is provided with a branching portion 2 a from which a branch pipe 2 b connected to the lower part of the intake water storage tank 4 branches. One end of a first drain pipe 11 for discharging water in the intake water storage tank 4 is connected to the branch portion 2a. In addition, one end of a second drain pipe 12 for discharging the water in the hot water supply hot water storage tank 6 is connected to the lower part of the hot water supply hot water storage tank 6. The other ends of the first drain pipe 11 and the second drain pipe 12 merge with each other, and a drain valve 13 is provided at the junction. As will be described later, when the drain valve 13 is opened, the water in the hot water storage tanks 4 and 6 is simultaneously discharged through the branch pipe 2b, the first drain pipe 11 and the second drain pipe 12. The discharged water is guided to a drain groove (not shown) through a drain pipe 14 connected to the outlet side of the drain valve 13.

  In the present embodiment, the drain valve 13 is provided at the junction of the first drain pipe 11 and the second drain pipe 12, but in the present invention, the drain pipe from a plurality of hot water storage tanks is joined. A drain valve may be provided on the downstream side.

  A hot water supply pipe 7 for supplying hot water to a hot water supply destination is connected to the upper part of the hot water supply side hot water storage tank 6. An expanded water drainage pipe 9 branches from the vicinity of the connection between the upper part of the hot water storage tank 6 and the hot water supply pipe 7. The expansion water drain pipe 9 extends to the drain valve 13 and is connected to the drain valve 13. A pressure relief valve 8 is provided in the middle of the expansion water drain pipe 9. The pressure relief valve 8 is opened when the internal pressure of the hot water storage tanks 4 and 6 exceeds a predetermined pressure due to volume expansion of the hot water in the hot water storage tanks 4 and 6 due to boiling of the hot water. As a result, the expanded water (surplus water) generated by the volume expansion is discharged from the expanded water drain pipe 9 through the drain valve 13 to the outside of the system, thereby preventing an excessive increase in the internal pressure of the hot water storage tanks 4 and 6. it can.

  The hot water storage circulation pipe 10 is a pipe that reaches the upper part of the hot water supply side hot water storage tank 6 from the lower part of the intake side hot water storage tank 4 via the heat exchanger for boiling in the heat pump unit 20. The hot water storage circulation line 10 includes an outgoing pipe 10a, a return pipe 10b, and a hot water storage water pump (not shown). The forward pipe 10a connects the lower part of the intake-side hot water storage tank 4 to the boiling heat exchanger. The return pipe 10 b connects the boiling heat exchanger and the upper part of the hot water supply side hot water storage tank 6. The hot water storage water pump is disposed in the middle of the forward pipe 10 a or in the heat pump unit 20.

  A tank connection line 5 that connects the two hot water storage tanks 4 and 6 includes a connection pipe 5 a that connects the upper part of the intake water storage tank 4 and the lower part of the hot water supply tank 6, an upper part of the connection pipe 5 a, and a drain valve 13. And an air inflow tube 5c branched from the air inflow tube 5b. The other end of the branched air inflow pipe 5 c is connected to the vicinity of the connection portion between the upper part of the hot water storage tank 6 and the hot water supply pipe line 7. In the air inflow pipe 5b, a check valve 5d is installed in the vicinity of the end portion on the side connected to the connecting pipe 5a. The check valve 5d allows only the flow in the direction from the air inflow pipe 5b to the connection pipe 5a and blocks the flow in the reverse direction. For this reason, it can prevent reliably that the water in the connection pipe 5a flows backward into the air inflow pipe 5b. In the air inflow pipe 5c, a check valve 5e is disposed in the vicinity of the end portion on the side connected to the hot water supply pipe line 7. The check valve 5e allows only the flow in the direction from the air inflow pipe 5c toward the hot water supply pipe 7, and blocks the flow in the reverse direction. For this reason, it is possible to reliably prevent the water in the hot water supply pipe 7 from flowing backward to the air inflow pipe 5c.

  In the present embodiment, the air inflow pipes 5b and 5c, the connecting pipe 5a and a part of the hot water supply pipe line 7 constitute an air inflow path for allowing air to flow into the upper portions of the hot water storage tanks 4 and 6 during drainage. Thus, by using a part of the connecting pipe 5a and the hot water supply pipe line 7 as the air inflow path, the piping system can be simplified and the cost can be reduced.

  Of the above-described components constituting the hot water storage tank unit 100, those other than the water supply pipe 2, the hot water circulation pipe 10, the hot water supply pipe 7, and the drain pipe 14 are accommodated in the outer shell of the hot water storage tank unit 100. . A part of each of the water supply pipe 2, the hot water circulation pipe 10, the hot water supply pipe 7 and the drain pipe 14 extends to the outside of the hot water storage tank unit 100.

  Next, based on FIG. 2 thru | or FIG. 6, the drain valve 13 with which the hot water storage type water heater 110 of this embodiment is provided is demonstrated in detail. FIG. 2 is a perspective view of the drain valve 13. As shown in FIG. 2, the drain valve 13 has a structure in which an air intake valve 13v for taking air into the air inflow pipes 5b and 5c during drainage is integrally provided. The drain valve 13 includes a drain pipe connection port 13a connected to the first drain pipe 11, a drain pipe connection port 13b connected to the second drain pipe 12, and an air delivery port connected to the air inlet pipe 5b. 13 c, a connection port 13 d connected to the expansion water drain pipe 9, a handle 13 e for operating the drain valve 13, and a discharge port 13 i connected to the drain pipe 14.

  3 and 4 are cross-sectional perspective views when the drain valve 13 is closed. FIG. 3 shows a cross section when cut along a horizontal plane passing through the center of a rotating shaft 13j described later. FIG. 4 shows a cross section when cut along a vertical plane passing through the center of a rotating shaft 13j described later. In the normal use state of the hot water storage type water heater 110, the drain valve 13 is closed as shown in these drawings.

  As shown in FIGS. 3 and 4, a switching ball portion 13 f that opens and closes drainage is provided inside the drainage valve 13. The switching ball portion 13f is connected to the handle 13e via the rotation shaft 13j. The drain valve 13 is opened and closed by the rotation operation applied to the handle 13e being transmitted to the switching ball portion 13f by the rotating shaft 13j.

  An air switching shaft 13k is connected to the switching ball portion 13f on the side opposite to the rotating shaft 13j. The handle 13e, the rotating shaft 13j, the switching ball portion 13f, and the air switching shaft 13k rotate together. The air switching shaft 13k is accommodated in the housing 13q. In the present embodiment, an air intake valve 13v is configured by the air delivery port 13c, the air switching shaft 13k, the housing 13q, and the like.

  A drain hole 13g is formed in the switching ball portion 13f. As shown in FIG. 4, the drain hole 13g penetrates through the center of the switching ball portion 13f and also opens on the air switching shaft 13k side, and has a substantially T-shape as a whole. A cutout portion 13s for forming a gap through which water can flow is provided at the end of the air switching shaft 13k on the side connected to the switching ball portion 13f. The notch 13s communicates with the drain hole 13g.

  As shown in FIG. 3, a switching ball portion packing 13h as a sealing member is provided between the switching ball portion 13f and the drain pipe connection port 13a and between the switching ball portion 13f and the drain pipe connection port 13b. Each is installed. In the closed state of the drain valve 13, the drain hole 13g is in a position not communicating with the drain pipe connection ports 13a and 13b. For this reason, the drain pipe connection ports 13a and 13b are sealed by the outer peripheral surface of the switching ball portion 13f and the switching ball portion packing 13h. Therefore, the discharge of water from the first drain pipe 11 and the second drain pipe 12 is prevented.

  On the other hand, as shown in FIG. 4, the connection port 13d to which the expanded water drain pipe 9 is connected communicates with the discharge port 13i through the drain hole 13g. For this reason, the expansion water from the expansion water drain pipe 9 can be discharged from the discharge port 13 i and can flow through the drain pipe 14 to the drain groove.

  As shown in FIG. 3, the air switching shaft 13k is formed with an air intake passage 13m and a valve hole 13n. The air intake passage 13m is formed in the air switching shaft 13k along the axial direction, and opens to the end surface of the air switching shaft 13k opposite to the switching ball portion 13f. The valve hole 13n communicates between the outer peripheral surface of the air switching shaft 13k and the air intake passage 13m. Between the air switching shaft 13k and the housing 13q, air switching shaft packings 13p and 13r are installed as sealing members. The air switching shaft packing 13p is disposed around the valve hole 13n, and the air switching shaft packing 13r is disposed along the outer periphery of the air switching shaft 13k. In the closed state of the drain valve 13, the valve hole 13n is in a position not communicating with the air outlet 13c. For this reason, the air outlet 13c is sealed by the outer peripheral surface of the air switching shaft 13k and the air switching shaft packings 13p and 13r. Thus, when the drain valve 13 is in the closed state, the air intake valve 13v is also in the closed state, so that the inflow of air into the air inflow pipes 5b and 5c is blocked.

  When the drain valve 13 is in the closed state described above, the hot water storage hot water heater 110 can be used normally. That is, when the drain valve 13 is in the closed state, the drain pipe connection ports 13a and 13b are blocked, so that water from the first drain pipe 11 and the second drain pipe 12 is not discharged. Therefore, water does not drain from the lower part of the hot water storage tanks 4 and 6 via the drain valve 13. When the drain valve 13 is closed, the air intake valve 13v is also closed, the air outlet 13c to which the air inlet pipe 5b is connected is shut off, and the inflow of air to the air inlet pipes 5b and 5c is blocked. Is done. For this reason, it can prevent reliably that air mixes in the hot water storage tanks 4 and 6 at the time of normal use.

  Further, in the hot water storage type hot water heater 110 of the present embodiment, the water pressure generated from the hot water storage tanks 4 and 6 is closed by the check valves 5d and 5e provided in the air inflow pipes 5b and 5c. The water pressure generated from the 6 side does not act on the air inflow pipes 5b and 5c beyond the check valves 5d and 5e. For this reason, the pressure resistance performance of the air intake valve 13v does not need to be increased more than necessary, and an economical design is possible.

  5 and 6 are cross-sectional perspective views when the drain valve 13 is opened. FIG. 5 shows a cross section when cut along a horizontal plane passing through the center of the rotating shaft 13j. FIG. 6 shows a cross section when cut by a vertical plane passing through the center of the rotating shaft 13j. When it is necessary to discharge hot water in the hot water storage tanks 4 and 6 in order to check the hot water storage type hot water heater 110, a stop cock (not shown) between the water source and the water supply pipe line 2 is closed. After stopping the supply of water from the water source side, the drain valve 13 is opened as shown in FIGS. 5 and 6 by turning the handle 13e of the drain valve 13.

  When the drain valve 13 is opened, the drain hole 13g of the switching ball portion 13f comes to a position communicating with the drain pipe connection ports 13a and 13b, as shown in FIG. As a result, the water from the first drain pipe 11 and the second drain pipe 12 flows into the drain holes 13g from the drain pipe connection ports 13a and 13b as shown by the arrows in FIG. 5 and FIG. It becomes possible to flow through the notch 13s of the switching shaft 13k to the discharge port 13i. In this state, hot water in the two hot water storage tanks 4 and 6 can be discharged to the drainage groove via the drain valve 13 and the drain pipe 14 at the same time.

  Further, when the drain valve 13 is opened, as shown in FIG. 6, the air intake valve 13v is opened because the valve hole 13n of the air switching shaft 13k is in a position communicating with the air delivery port 13c. . As a result, the air taken in from the air intake passage 13m can flow through the valve hole 13n to the air outlet 13c, as shown by the arrow in FIG. That is, in this state, the air taken in from the air intake passage 13m can be made to flow into the upper portions of the hot water storage tanks 4 and 6 through the air inflow pipes 5b and 5c, respectively. For this reason, the hot water in the hot water storage tanks 4 and 6 can be discharged smoothly and quickly.

  As described above, according to the present embodiment, the air intake valve 13v can be opened in conjunction with the operation of opening the drain valve 13. For this reason, the hot water in the two hot water storage tanks 4 and 6 can be discharged smoothly and quickly at the same time by a single operation of only operating the handle 13e. Further, unless the drain valve 13 is opened, the air intake valve 13v is not opened, and the air intake valve 13v is not opened by mistake, so that air is mixed into the hot water storage tanks 4 and 6 during normal use. This can be surely prevented. Moreover, since it is not necessary to provide an air intake valve in the upper part of the hot water storage tanks 4 and 6, the product height of the hot water storage tank unit 100 can be suppressed, which is advantageous for transportation and installation of products.

  In the present embodiment, check valves 5d and 5e are provided in the air inflow pipes 5b and 5c as a backflow prevention mechanism for preventing water from flowing back to the air intake valve 13v through the air inflow path during drainage. Thus, it is possible to reliably prevent water from flowing back to the air intake valve 13v located below the hot water storage tanks 4 and 6.

  As mentioned above, although embodiment of the hot water storage type water heater of this invention was described, this invention is not limited to embodiment mentioned above. For example, the present invention can be applied to a hot water storage water heater in which three or more hot water storage tanks are connected in series, and an electric heater or the like can be used as a heat source device in addition to the heat pump unit. .

2 Water supply line 4 Water intake side hot water storage tank 5 Tank connection line 5a Connection pipes 5b and 5c Air inflow pipes 5d and 5e Check valve 6 Hot water supply side hot water storage tank 7 Hot water supply line 9 Expansion water drainage line 11 First drain pipe 12 Second drain pipe 13 Drain valve 13a, 13b Drain pipe connection port 13c Air outlet 13e Handle 13f Switching ball 13g Drain hole 13i Drain port 13j Rotating shaft 13k Air switching shaft 13m Air intake passage 13n Valve hole 13v Air intake Entrance valve 14 Drain pipe 20 Heat pump unit 100 Hot water storage tank unit 110 Hot water storage type water heater

Claims (3)

A plurality of hot water storage tanks sequentially connected in series by connecting the upper part of the hot water storage tank and the lower part of the next hot water storage tank via a connecting pipe;
A plurality of drain pipes each having one end communicating with a lower portion of each of the plurality of hot water storage tanks;
A merging portion where the other ends of the plurality of drain pipes merge or a drain valve provided on the downstream side of the merging portion;
An air intake valve interlocked with the drain valve so as to be integrated with the drain valve, open when the drain valve is opened, and closed when the drain valve is closed;
An air inflow path through which air taken in from the air intake valve can flow into each of the plurality of hot water storage tanks from above;
With
When the drain valve is opened to simultaneously drain water from the plurality of hot water storage tanks, the air intake valve opens in conjunction with the air intake valve so that the air taken in from the air intake valve passes through the air inflow path. Configured to flow into each of the hot water storage tanks from above ,
The hot water storage type hot water heater , wherein the air inflow path is configured to allow air to flow into the hot water storage tank using a part of the connecting pipe . A plurality of hot water storage tanks sequentially connected in series by connecting the upper part of the hot water storage tank and the lower part of the next hot water storage tank via a connecting pipe;
A plurality of drain pipes each having one end communicating with a lower portion of each of the plurality of hot water storage tanks;
A merging portion where the other ends of the plurality of drain pipes merge or a drain valve provided on the downstream side of the merging portion;
An air intake valve interlocked with the drain valve so as to be integrated with the drain valve, open when the drain valve is opened, and closed when the drain valve is closed;
An air inflow path through which air taken in from the air intake valve can flow into each of the plurality of hot water storage tanks from above;
With
When the drain valve is opened to simultaneously drain water from the plurality of hot water storage tanks, the air intake valve opens in conjunction with the air intake valve so that the air taken in from the air intake valve passes through the air inflow path. Configured to flow into each of the hot water storage tanks from above,
The hot water storage type hot water supply apparatus, wherein the air inflow path is a path different from an expansion water drain pipe for discharging the expansion water of the hot water storage tank.   3. The hot water storage type hot water heater according to claim 1, wherein the air inflow path includes a backflow prevention mechanism that prevents water from flowing back to the air intake valve through the air inflow path.

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