JP2005147412A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of simplifying the drainage work and a drainage structure inside of a water heater, and preventing the water leakage in the water heater caused by freezing and blockage by foreign matters such as garbage. <P>SOLUTION: This hot water storage type water heater comprises a hot water storage tank 20 for storing the hot water heated by a heating element 21, a relief valve 32 connected with the hot water storage tank 20, a bath hot water supply pipe 35 from the hot water storage tank 20 to a bathtub 34, an isolating device 36 for isolating a hot water storage tank 20 side and a bathtub 34 side, and a drain tank 34 having a drainage port 25 for consolidating a first discharge pipe 30 for discharging the expanded water from the relief valve 32 and a second discharge pipe 37 for discharging the water from the isolating device 36 and discharging the water from one spot, and the drain tank 34 has an opening part 44 communicated with the air and discharging the overflow water. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drainage configuration of a hot water storage type water heater.

  As shown in FIG. 4, in a conventional drainage structure of an electric water heater, water supplied from a water source is reduced to a constant pressure by a pressure reducing valve 2 provided in a water supply pipe 1 and supplied into a hot water storage tank 3. The supplied water is heated by the heating element 4 and boiled to a certain temperature, and then is discharged into the bathtub 8 through the hot water supply pipe 5 and the hot water supply port 6 and the pouring pipe 7. At this time, hot water whose temperature is adjusted by the mixing valve 5B and the mixing valve 7B that mix the water that has passed through the water supply pipes 5A and 7A branched from the water supply pipe 1 flows through the hot water supply pipe 5 and the pouring pipe 7.

  In addition, a first discharge pipe provided with a relief valve 9 is provided at the upper part of the hot water storage tank 3 in order to maintain a constant tank internal pressure that rises when water is boiled, and when the relief valve 9 operates. The discharged expanded water is discharged from the first discharge pipe 10 to the outside through the discharge hole 10A of the main body bottom plate 11, and flows into the drain groove 13 provided in the floor portion 12.

  In addition, when the water pressure on the bathtub 8 side is higher than the water pressure on the hot water storage tank 3 side, for example, when the bathtub is installed on the floor, the bathtub water flows back from the bathtub 8 side to the hot water storage tank 3 side. In order to flow into the hot water storage tank 3, an edge cutting device 14 is provided for the purpose of preventing this, and drainage from the edge cutting device 14 is taken out via the second discharge pipe 15. It is discharged to the outside through the discharge hole 10 </ b> A and poured into a drainage groove 13 provided in the floor portion 12. When the water pressure on the water supply pipe 1 side is lower than that on the hot water storage tank 3 side, the second discharge pipe 15 has an atmospheric pressure on the water supply pipe 1 side so that hot water in the hot water storage tank 3 does not flow backward to the water supply pipe 1 side. It also has the effect of adding.

  Further, when the pressure in the hot water storage tank 3 rises when the relief valve 9 is in a failure state, a can body protection valve 16 is provided for the purpose of protecting the tank, and when the tank internal pressure exceeds a specified pressure, the water supply pipe 1 is provided. The connected can body protection valve 16 is in an open state so that the expanded water is discharged from the third discharge pipe 17 through the discharge hole 10A of the main body bottom plate 11 and flows into the drain groove 13 provided in the floor portion 12. It was.

  As described above, in the conventional hot water storage type hot water heater, a configuration in which surplus water from the hot water storage tank 3 is led to the drainage groove 13 directly from each discharge pipe and drained is common.

However, in recent years, there is a type in which a drainage receiver is provided on the bottom surface of the hot water storage tank, and surplus water from each discharge pipe is collected in the drainage receiver and flows into the drainage groove (for example, see Patent Document 1).
JP-A-10-325616

  However, according to the drainage structure of the conventional hot water storage type hot water heater, the first discharge pipe 10, the second discharge pipe 15, and the third discharge pipe 17 that discharge the surplus water of the hot water storage tank 3 are each independently disposed outside. It was necessary to pipe up to the groove 13, which involved a plurality of pipe works.

  In addition, if the discharge groove 13 is located away from the device body, the discharge pipe becomes longer and may freeze in the severe winter season. If the discharge pipe is clogged by freezing in the type directly piping to the drain groove 13, As the pressure in the discharge pipe rises, it comes off at the connecting part, or the discharge pipe (rubber hose) ruptures and excess water leaks into the device, causing various problems. The clogging phenomenon of the discharge pipe due to freezing causes the same problem as overflowing from the drainage receptacle even in the type concentrated in the drainage receptacle disclosed in Patent Document 1.

  Therefore, in a place where freezing occurs, it is necessary to provide a heater to prevent freezing, and there is an increase in power consumption due to energization of the heater.

  Also, during periods when there is a risk of freezing, even when the water heater is not in use, prevent freezing by energizing the device itself or draining all water in the hot water storage tank to prevent freezing. There was a need for provision.

  The present invention solves the above-described conventional problems, and obtains a drainage structure for a hot water storage hot water heater that simplifies drainage work and the drainage structure inside the water heater, and prevents water leakage due to freezing or clogging of dust or the like. For the purpose.

  In order to solve the above-described conventional problems, the hot water storage type water heater of the present invention collects and drains excess water generated from a plurality of locations in a heating or utilization process into a drain tank provided at a lower portion of the main body, and the drain tank Has a plurality of excess water inlets and drains, at least one of the plurality of excess water inlets is open to the atmosphere, and the other excess water inlets are connected in a watertight manner.

  As a result, surplus water discharged from a plurality of locations discharged from the hot water storage tank is collected in the drainage tank, and is collectively discharged from the discharge port into the drainage groove, thereby simplifying the piping work to the outside. In addition, by providing a drain tank outlet and a plurality of surplus water inlets facing each other and providing a watertight space of a predetermined capacity between them, even if the outlet is clogged due to freezing, the surplus water inlet is opened to the atmosphere. As a result, surplus water can be discharged to the outside, and water does not overflow into the equipment.

  The hot water storage type hot water heater of the present invention collects surplus water from a plurality of locations in an aggregation tank and discharges it from one drainage port, so that piping work can be simplified and an air communication port is provided above the drainage port. Therefore, even if the drain port is clogged due to freezing or the like, water can be drained from the air communication port without overflowing into the equipment.

  A first aspect of the invention relates to a hot water storage type hot water heater that heats supplied water and stores it as hot water in a hot water storage tank, and then adjusts it to a desired temperature by a mixing valve and uses it for hot water supply or hot water filling. In the process, surplus water generated from a plurality of locations is collected and drained in a drain tank provided at the bottom of the main body, and the drain tank has a plurality of surplus water inlets and drain ports, At least one of them is open to the atmosphere, and the other surplus water inlets are watertightly connected. Excess water discharged from the hot water storage tank is collected in the drainage tank. Since the water is discharged from the discharge port to the drain, the piping work to the outside is simplified. In addition, by providing a drain tank outlet and a plurality of surplus water inlets facing each other and providing a watertight space of a predetermined capacity between them, even if the outlet is clogged due to freezing, the surplus water inlet is opened to the atmosphere. As a result, surplus water can be discharged to the outside, and water does not overflow into the equipment.

  According to a second aspect of the present invention, there is provided a hot water storage tank for storing hot water heated by a heat source, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for taking out high-temperature water in the hot water storage tank, and the hot water supply pipe and the water supply pipe. A hot water supply pipe connected to the mixing valve and used for hot water supply, the hot water supply pipe and the water supply pipe connected to the bath mixing valve and connected to the hot water filling pipe used for bath hot water filling through the edge cutting device, and connected to the upper part of the hot water storage tank A relief valve, a can body protection valve that opens when the pressure in the hot water storage tank exceeds a predetermined value, a first drain pipe that takes out the expanded water from the relief valve, and a second drain that takes out the drainage from the edge cutting device A drainage tank that collects drainage from each drainage pipe and discharges it to the outside, and the drainage tank is watertight with each drainage pipe. Connecting part to be connected to, and larger than the connecting part It is characterized in that it has a structure having an opening drainage opening and an opening communicating with the atmosphere, and each of the discharge water from the expansion water and the filling device for hot water filling and the drainage from the can body protection valve at the time of heating. It is connected to a drainage tank via a drainage pipe and discharged from a drainage outlet to a drainage groove. Excess water from three locations can be concentrated and drained from one location, and the piping configuration is simple. In addition, when the drain outlet is clogged, drainage can be made through the opening communicating with the atmosphere, and measures against water leakage due to freezing can be easily realized.

  The third invention is characterized in that the second drain pipe is configured to connect the air intake pipe of the edge cutting device to the drain tank, and the air intake port that constantly applies atmospheric pressure to the edge cutting device is drained. By connecting to the tank, it is possible to share the wastewater treatment during the reverse flow of the bathtub water.

  The fourth invention is characterized in that, apart from the opening, the drainage tank is provided with an air intake above the opening, and the drainage port is free from foreign matter such as freezing and dust. Even if the situation is worsening and draining from the opening, the air inlet for air communication is above the opening, so the air intake piping to the edge cutting device is not sealed, Air can surely be taken in.

  The fifth aspect of the invention is characterized in that the can body protection valve is directly attached to the hot water storage tank. When the can body protection valve itself is not frozen and an abnormal pressure is applied to the can body, it is reliable. The tank internal pressure is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a vertical cross-sectional view of a hot water storage type water heater in the first embodiment of the present invention, and FIG. 2 is a vertical cross sectional view of a main part of the hot water storage type water heater.

  In the figure, 20 is a hot water storage tank for storing water, and 21 is a heating element attached to the hot water storage tank 20 in order to heat the water in the hot water storage tank 20. In the present embodiment, the heating element 20 is provided in the hot water storage tank 20. However, in this configuration, heating means configured by a heat pump unit or a heater unit is provided outside the hot water storage tank 20, and water is supplied from the bottom of the tank. It is also possible to adopt a configuration in which high temperature water is boiled up from the upper part of the tank by repeating a heating cycle in which the water is taken out and heated by the heating means and then returned to the upper part of the tank.

  22 is a bottom plate provided on the bottom surface of the main body, 23 is a discharge hole portion on the side surface of the bottom plate, and 24 is a drain tank in which a drain port 25 is drawn downward from the discharge hole 23. An external drain pipe 46 that guides drainage to the drainage groove 45 is connected to the drainage port 25.

  A water supply pipe 26 supplies water into the hot water storage tank 20. The upstream end is connected to a water source, and the downstream end is connected to the lower part of the hot water storage tank 20. A pressure reducing valve 27 is provided in the water supply pipe 26 to supply water into the hot water storage tank 20 at a constant pressure. These water supply pipe 26 and pressure reducing valve 27 constitute water supply means.

  Reference numeral 29 denotes a first drain pipe for discharging the expanded water when boiling water to the outside. The first drain pipe branches from the hot water supply pipe 28, and its downstream end has surplus water from a tank provided above the drain tank 24 provided on the bottom plate 22. It is connected to a first drainage intake 30 that is a receiving port. Reference numeral 32 denotes a relief valve provided in the first drain pipe 29 in order to regulate the pressure in the hot water storage tank 20 to a certain level or less. And the 1st drain pipe 29 comprises the expansion water discharge means.

  A hot water supply pipe 28 has an upstream end connected to the upper portion of the hot water storage tank 20. The hot water temperature is adjusted by a hot water supply mixing valve 26 </ b> B that mixes water passing through the water supply pipe 26 </ b> A branched from the water supply pipe 26. These constitute hot water supply means. The hot water branched from the hot water pipe 28 connected to the upper part of the hot water storage tank 20 and the water branched from the water supply pipe 26 and passed through the water supply pipe 35A are mixed in the bath mixing valve 35B, and the temperature-controlled hot water is supplied to the bathtub 34. It is a hot water pipe for bathing. Reference numeral 36 denotes an edge cutting device that prevents sewage in the bathtub 34 from flowing back into the hot water storage tank 20. 37 is connected to the edge cutting device 36, and is a second discharge pipe for discharging the sewage in the bathtub 35 to the outside when the pressure on the bathtub 34 side is applied to the edge cutting device 36 more than a certain level. A second drainage intake 39 is connected. And the 2nd drain pipe 37 comprises the bathtub backflow water discharge means. Further, when the pressure in the hot water storage tank 20 falls below the atmospheric pressure, the atmosphere is sucked from the second drain pipe 37 connected to the edge cutting device 36 so that the sewage in the bathtub 35 does not flow backward into the hot water storage tank 20.

  Reference numeral 40 denotes a can body protection valve provided in the water supply pipe 26 in order to regulate the pressure in the hot water storage tank 20 to a value not less than a set pressure of the relief valve 32 and not more than a certain value. In this embodiment, the can body protection valve 40 is provided in the water supply pipe 26. However, it may be directly attached to the hot water storage tank 20, which is desirable from the viewpoint of preventing freezing. However, since it is detectable even if it attaches to the water supply pipe 26, it is set as this attachment position in this Embodiment.

  Reference numeral 41 denotes a third discharge pipe for discharging hot water in the hot water storage tank 20 to the outside when the can body protection valve 40 is actuated, and a downstream end is a third discharge pipe provided at the upper part of the drainage tank 24. It is connected to the drainage intake 43. The relief valve 32 and the can body protection valve 40 ensure double safety against the pressure increase in the hot water storage tank 20.

  Next, the configuration of the drain tank 24 will be described with reference to FIG.

  Reference numeral 44 denotes an air communication opening formed in the upper portion of the drainage tank 24, and an overflow pipe 47 is connected to the opening 44 with the downstream side exposed to the outside. As a result, the drain port 25 of the drainage tank 24 is clogged with freezing or dust, and even if drainage is stored in the drainage tank 24, it is drained to the outside through the overflow pipe 47 from the opening 44. There is no leakage of water into the device due to disconnection or rupture of the drainage pipe 29, the second drainage pipe 37, or the third drainage pipe 41, and the occurrence of problems due to water leakage can be eliminated. Moreover, since the waste water from the relief valve 32 can be discharged reliably, the pressure in the hot water storage tank 20 can be kept constant.

  Further, the second drain pipe 37 connected to the edge cutting device 36 also serves as a pipe for sending air into the hot water storage tank 20 when the hot water storage tank 20 becomes below atmospheric pressure. By doing so, the opening 44 can also be used as an air intake port, air can be reliably fed into the hot water storage tank 20, and there is no fear that the sewage in the bathtub 35 will flow back into the hot water storage tank 20. And the internal piping of an electric water heater can be simplified.

  Moreover, since the water drained from the can body protection valve 40 can be reliably drained outside through the drain tank, the pressure in the hot water storage tank 20 can be kept below a certain level.

  Further, since there is no problem due to freezing of the external drain pipe 46, a heater for preventing freezing is not required, and power consumption can be suppressed.

  And since the three drain pipes of the 1st drain pipe 29, the 2nd drain pipe 37, and the 3rd drain pipe 41 are collected in the drain tank 24, and are discharged outside from one place of the drain port part 26, construction Can be simplified.

  Even if the downstream end 46 </ b> A of the external drain pipe 46 is sealed with water in the drain groove 45, drainage can be ensured by the opening 44, so that the construction can be simplified.

(Example 2)
FIG. 3 is a detailed view of a main part of a hot water storage type water heater in the second embodiment of the present invention.

  In FIG. 3, reference numeral 48 denotes an air communication inlet provided at the upper part of the opening 44. As a result, the drainage port 25 of the drainage tank 24 is clogged with freezing, dust, etc., and the hot water storage tank 20 is surely secured from the air intake 48 even while being drained to the outside through the overflow pipe 47 from the opening 44. Air can be sent into the tub, and there is no concern that the sewage in the bathtub 35 will flow back into the hot water storage tank 20.

  As described above, the hot water storage type hot water heater according to the present invention collects surplus water from a plurality of locations in an aggregation tank, discharges it from one drainage port, and provides an air communication port above the drainage port. Equipment that has a drainage structure that drains water from multiple locations at once because the drainage work has been simplified to prevent water from overflowing into the equipment even if the drain outlet is clogged with freezing. Applicable to.

1 is a longitudinal sectional view of a hot water storage type water heater in Embodiment 1 of the present invention. Longitudinal section of the hot water storage system The principal part longitudinal cross-sectional view of the hot water storage type water heater in Embodiment 2 of this invention Vertical section of a conventional electric water heater

Explanation of symbols

20 Hot water storage tank 21 Heating element (heat source)
24 drainage tank 25 drainage port 26 water supply pipe 26B hot water supply mixing valve 28 hot water supply pipe 29 first drainage pipe 30 first drainage intake (connecting portion)
32 Relief valve 34 Bathtub 35 Bath hot water supply pipe (hot water pipe)
35B Bath mixing valve 36 Edge cutting device 37 Second discharge pipe 39 Second drainage intake (connecting part)
40 Can body protection valve 41 3rd discharge pipe 43 3rd drainage intake (connection part)
44 Opening 45 Drainage channel

Claims (5)

Heated water is stored in hot water storage tanks as hot water, adjusted to the desired temperature with a mixing valve, and used for hot water supply, hot water filling, etc. Waste water collected in a drain tank provided in the lower part of the main body and drained, and the drain tank has a plurality of surplus water inlets and drain ports, and at least one of the plurality of surplus water inlets is atmospheric. A hot water storage hot water heater that is open and connected to other surplus water inlets in a watertight manner. A hot water storage tank for storing hot water heated by a heat source, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for taking out high-temperature water in the hot water storage tank, and the hot water supply pipe and the water supply pipe are connected to a hot water supply mixing valve. A hot water supply pipe used for hot water supply, a hot water supply pipe connected to the bath mixing valve by connecting the hot water supply pipe and the water supply pipe to a bath hot water supply via an edge cutting device, an escape valve connected to the upper part of the hot water storage tank, and the hot water storage A can body protection valve that opens when the pressure in the tank exceeds a predetermined value, a first drain pipe that takes out the expansion water from the relief valve, a second drain pipe that takes out drain water from the edge cutting device, and the can body A third drainage pipe for taking out drainage from the protection valve; and a drainage tank for concentrating drainage from each drainage pipe and discharging it to the outside, wherein the drainage tank is connected to each drainage pipe in a watertight manner; , A larger opening than the connection Configuration and the hot water storage type water heater having a mouth, an opening communicating with the atmosphere. The hot water storage type hot water heater according to claim 1, wherein the second drain pipe is configured to connect a pipe for air intake of the edge cutting device to the drain tank. The hot water storage type water heater according to claim 1, wherein an air intake is provided above the opening in the drainage tank separately from the opening. The hot water storage hot water heater according to claim 1, wherein the can body protection valve is directly attached to the hot water storage tank.

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