JP5056293B2 - Main water heater system - Google Patents

Description

  The present invention relates to a main water heater system.

Conventionally, as described in Patent Document 1, a main water heater having a channel opening / closing means on the upstream side of a hot water tank, and a water discharge pipe connecting a water outlet and a faucet of the main water heater And a drainage hopper with one end connected to the connecting pipe branched from the cheese joint and the other end connected to the drainage pipe. When the flow rate of water flowing through the pipe is slow, water is introduced to the connection pipe, and when the flow rate is high, water is introduced to the flow path on the faucet side without causing water to flow into the connection pipe. There has been proposed a non-stop water heater system in which residual water in a pipe between a joint and a faucet is discharged from the cheese joint to a drain hopper.
Japanese Patent No. 3838066

  By the way, hot water from the hot water storage tank stays upstream of the cheese joint of the water discharge pipe (between the hot water storage tank and the cheese joint). Temperature drops. In this case, there is a possibility that various germs may propagate in the accumulated hot water, and in order to prevent this, water from the water supply source is opened and closed in the water discharge pipe by opening / closing operation of the channel opening / closing means provided on the upstream side of the hot water tank. It is necessary to perform so-called water replacement, in which the hot water is periodically discharged and the accumulated hot water is discharged to the outside.

  However, in the primary water heater system described in Patent Document 1, when water is replaced, when the water having a high flow rate pressurized by the water supply pressure of the water supply source flows into the water discharge pipe upstream of the cheese joint. Then, the water is led to the faucet side passage through the cheese joint. For this reason, water for water replacement is discharged from the faucet, and unintentional water discharge may cause discomfort to the user and may cause misunderstanding that a water stoppage failure of the faucet has occurred. was there. Moreover, it is not preferable from the aspect of appearance that water for water replacement is discharged from the faucet.

  Therefore, the present invention provides a cheese joint in the middle of the water discharge pipe between the water outlet of the main water heater and the water faucet, and prevents the water for water replacement from being discharged from the water faucet. The object is to provide a water heater system.

  In order to achieve the above-mentioned object, the invention according to claim 1 connects a main water heater having a channel opening / closing means on the upstream side of a hot water tank, and a water outlet and a faucet of the main water heater. A cheese joint provided in the middle of the water discharge pipe, and a drain hopper with one end connected to a connecting pipe branched from the cheese joint and the other end connected to a drain pipe, When the flow rate of water flowing through the water discharge pipe is slow, water is introduced to the connection pipe, and when the flow rate is high, water is introduced to the flow path on the faucet side without causing water to flow into the connection pipe. In the main water heater system, the channel opening / closing means includes a normal flow rate for guiding the flow rate of the water flowing through the water discharge pipe to the channel on the faucet side via the cheese joint, and the cheese joint. The normal flow velocity to guide water to the connecting pipe through And characterized in that a switchable and slow water replacement flow rate Ri.

  According to a second aspect of the present invention, in the first aspect of the invention, the flow path opening / closing means is connected in series with a flow path switching means in which an electromagnetic open / close valve and an orifice are provided in parallel, and downstream thereof. It is characterized by comprising an electromagnetic on-off valve.

  According to the first aspect of the present invention, a main water heater having a channel opening / closing means on the upstream side of the hot water tank, and a midway of the water discharge pipe connecting the water outlet and the faucet of the main water heater And a drain hopper with one end connected to a connecting pipe branched from the cheese joint and the other end connected to the drain pipe, and the cheese joint has water flowing through the water discharge pipe. In the main water heater system configured to guide water to the connecting pipe when the flow rate is slow and to guide the water to the faucet side without letting water flow out to the connecting pipe when the flow rate is fast, The flow rate of the water flowing through the water discharge pipe is changed to a normal flow rate for guiding water to the faucet-side flow path through the cheese joint and a water replacement flow rate slower than the normal flow rate for guiding water to the connecting pipe via the cheese joint. Since switching is possible, when switching the water, By closing operation, water at a water replacement flow rate that is slower than the normal flow rate is passed through the water discharge pipe upstream of the cheese joint, and water is introduced to the connecting pipe through the cheese joint, so that the water for water replacement is discharged from the faucet. As a result, unintentional water discharge from the faucet does not cause discomfort to the user or cause misunderstanding that the water faucet of the faucet has failed. Also, the appearance can be improved.

  According to the second aspect of the present invention, the flow path opening / closing means is composed of flow path switching means in which an electromagnetic open / close valve and an orifice are provided in parallel, and an electromagnetic open / close valve connected in series downstream thereof. At the time of water replacement, the electromagnetic on-off valve in the flow path switching means is closed, and water from the water supply source is guided to the orifice to reduce the flow rate of water after passing through the orifice, and connected downstream in series. Opening the electromagnetic on-off valve, flowing water with a water replacement flow rate slower than the normal flow rate to the upstream side of the cheese joint, and guiding the water to the connecting pipe through the cheese joint, the water for water replacement is a faucet. Water can be prevented from being discharged from the water, and as a result, unintentional water discharge from the faucet can cause discomfort to the user or cause misunderstanding that a water stoppage failure of the faucet has occurred. There is no and looks good It can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic explanatory view showing an overall configuration of a main-stop water heater system A according to the first embodiment of the present invention.

  As shown in FIG. 1, a main water heater system A according to the present embodiment includes an electric water heater 10 which is a main water heater installed obliquely below the hand washer B, and an upper surface of the hand washer B. A cheese faucet 30 disposed in the middle of the water faucet 20 erected, the water discharge pipe 12 connecting the water faucet 10 a of the electric water heater 10 and the water faucet 20, and one end branched from the cheese joint 30. The drainage hopper 40 is connected to the connecting pipe 32 and the other end is connected to the drainage pipe 42. The drain pipe 42 is a pipe that is connected to the bottom of the bowl part B2 of the hand-washer B and drains water discharged from the faucet 20 to the bowl part B2 to the outside.

  The electric water heater 10 and the water supply source WS are connected in communication via a water supply pipe 50. Further, the faucet 20 and the electric water heater 10 are connected in communication via a water discharge pipe 12, and the water discharge pipe 12 is upstream of the cheese joint 30 (on the electric water heater 10 side). The water discharge pipe 12a and the downstream water discharge pipe 12b on the downstream side (the faucet 20 side) of the cheese joint 30 are configured.

  The faucet 20 is an automatic faucet provided with a hand detection sensor S. When the user's hand is sensed by the hand detection sensor S, the faucet 20 is automatically operated in accordance with water supply control of a control unit C which will be described later. Specifically, hot water or the like having an appropriate temperature supplied from the electric water heater 10 is discharged from the spout 22 to the bowl portion B2 of the hand washing device B. Further, the faucet 20 includes a hot water / water changeover switch (not shown) at a predetermined location, and hot water or water is selectively discharged from the water discharge port 22 by a switching operation of the hot water / water changeover switch. In this embodiment, the faucet 20 is configured as an automatic faucet. However, the faucet 20 is not limited to this configuration, and includes a hot water button and a water button. Alternatively, the hot water or water may be selectively discharged.

  The electric water heater 10 includes a casing 11 formed in a substantially rectangular box shape, a hot water tank 16 housed and disposed in the casing 11, an electric heater H disposed in the lower side of the hot water tank 16, and a hot water tank. A casing water supply pipe 52 extending from the lower wall 16 and connected to the water supply pipe 50, a casing water discharge pipe 14 extending from the upper wall of the hot water tank 16 and connected to the water discharge pipe 12, and the hot water storage tank 16. A flow path opening / closing means 60 (to be described later) according to the main part of the present invention disposed in the middle of the in-casing water supply pipe 52 on the upstream side, and a control unit C for controlling the operation of the electric water heater 10 as a whole. Yes. The piping 14 for water discharge in a casing is upstream of the hot water mixing valve 14a described later (on the hot water storage tank 16 side) 14b for upstream water discharge in the casing, and downstream of the hot water mixing valve 14a (on the water discharge port 10a). It is comprised by the piping 14c for downstream water discharge in a casing. The water supply pipe 50 and the casing water supply pipe 52 are connected to each other via a water supply port 50a to form a primary flow path 54. The water discharge pipe 12 and the casing water discharge pipe 14 are connected to each other. The secondary side flow path 56 is configured to be connected through the water port 10a. The drain valve 52a is connected in the middle of the water supply pipe 52 in the casing, and is opened to drain hot water in the hot water tank 16 to the outside when the electric water heater 10 is not used for a long period of time. It is a manual valve.

  The hot water storage tank 16 is formed so as to have a volume capable of sufficiently storing the amount of hot water normally used, and supplies hot water stored therein to the faucet 20.

  The electric heater H is connected to a power switch (not shown) provided on the outer surface of the casing 11. The electric heater H is energized when the power switch is turned on to generate heat. The electric heater H is interrupted when the hot water in the hot water storage tank 16 reaches a certain temperature, and is energized again when the hot water falls below a certain temperature. It has become. That is, a temperature sensor (not shown) is provided inside the hot water tank 16, and the temperature sensor is connected to the control unit C disposed in the casing 11, and based on a detection signal of the hot water temperature in the hot water tank 16 by the temperature sensor. The controller C controls energization and shutoff of the electric heater H.

  Further, a branch portion 58a is provided on the downstream side of the flow path opening / closing means 60 in the water supply pipe 52 in the casing, and the bypass pipe 58 is branched and extended from the branch portion 58a, and the tip of the bypass pipe 58 is connected to the secondary side. The flow path 56, that is, the in-casing water discharge pipe 14 is connected in communication. High temperature hot water supplied from the hot water storage tank 16 to the in-casing water discharge pipe 14 and from the in-casing water supply pipe 52 to the bypass pipe 58 are connected to the connecting portion between the bypass pipe 58 and the in-casing water discharge pipe 14. A hot and cold water mixing valve 14a for mixing water is provided.

  With the above configuration, the water that has passed through the flow path opening / closing means 60 branches in two directions, one flows into the hot water storage tank 16, and the other passes through the bypass pipe 58 and reaches the hot water mixing valve 14a. It is like that.

  Then, the hot water in the hot water storage tank 16 is pushed up by the amount of water flowing into the hot water storage tank 16 and flows out into the water discharge pipe 14 in the casing, and is mixed with the water from the bypass pipe 58 by the hot water mixing valve 14a. It becomes warm water and passes through the upstream water discharge pipe 12 a to reach the cheese joint 30. For example, when the temperature of the hot water pushed up from the hot water tank 16 is about 80 ° C. and the temperature of the water flowing through the bypass pipe 58 is about 20 ° C., both are mixed in the hot water mixing valve 14a. It becomes warm water with an appropriate temperature of about 36 ° C.

  The cheese joint 30 is disposed in the middle of the water discharge pipe 12 at a position lower than the water discharge port 22 of the automatic faucet 20. The flow path downstream of the cheese joint 30 in the water discharge pipe 12, that is, the downstream water discharge pipe 12 b extends upward from the cheese joint 30 toward the water faucet 20 and discharges the automatic water faucet 20. The water inlet 22 is connected in communication. The cheese joint 30 may be directly connected to the water discharge port 10a of the electric water heater 10 without using the upstream water discharge pipe 12a.

  A connecting pipe 32 branches downward from the cheese joint 30, and the connecting pipe 32 extends downward and is connected to one end of a drainage hopper 40 disposed at a position lower than the cheese joint 30. The other end of the drain hopper 40 is connected to the drain pipe 42. That is, the automatic faucet 20, the cheese joint 30, and the drainage hopper 40 are arranged with a height difference in this order from the top to the bottom.

  The cheese joint 30 has a structure in which the flow path of water is varied according to the flow rate of warm water or water flowing through the cheese joint 30. That is, the cheese joint 30 guides water to the connection pipe 32 when the flow velocity of the water flowing through the water discharge pipe 12 is slow, and is a flow path on the faucet 20 side without causing water to flow into the connection pipe 32 when the flow velocity is high. It is configured to guide water to a certain downstream water discharge pipe 12b.

  More specifically, the internal flow path of the cheese joint 30 is formed with a reduced flow portion 30a having a diameter gradually reduced from both end surfaces in the extending direction of the water discharge pipe 12 toward the center. A connecting pipe 32 is connected to 30a from below.

  And when the flow rate of the water which flows through the water discharge piping 12 like the expansion water from the electric water heater 10 is relatively slow, when the slow flow rate water reaches the contracted portion 30a in the cheese joint 30, gravity In response to this action, the air flows from the contracted portion 30 a to the connecting pipe 32 and is discharged to the drain pipe 42 via the drain hopper 40.

  On the other hand, when the flow rate of the water flowing through the water discharge pipe 12 is relatively high as in normal water discharge, even if the water having a high flow rate reaches the flow reducing portion 30a in the cheese joint 30, the flow is reduced. Therefore, the so-called ejector effect in which the inside of the cheese joint 30 is negatively generated is generated. Due to this ejector effect, the water passing through the constricted portion 30a is led to the downstream water discharge pipe 12b without flowing down to the connecting pipe 32, and finally discharged from the water discharge port 22 of the automatic water faucet 20. The

  Thereby, when expansion water generate | occur | produces in the hot water storage tank 16 of the electric water heater 10, from the cheese coupling 30 which provided this expansion water in the position lower than the spout 22 of the automatic faucet 20, the connection pipe 32 and drainage It can escape to the drain pipe 42 through the hopper 40. For this reason, expansion water does not dripping from the automatic faucet 20, does not give the user an unpleasant feeling or cause misunderstanding that a water stop failure of the automatic faucet 20 has occurred, The appearance is also improved.

  In particular, in the present embodiment, the cheese joint 30 and the drain hopper 40 are provided at a position lower than the spout 22 of the automatic faucet 20, and the automatic faucet 20 and the cheese joint 30 are vertically moved by the downstream water discharge pipe 12b. It is connected to the communication. That is, the automatic faucet 20, the downstream water discharge pipe 12b, the cheese joint 30, and the drainage hopper 40 are arranged with a height difference in this order from the top to the bottom. The hot water in the downstream water discharge pipe 12 b receives the action of gravity based on the height difference, flows into the connecting pipe 32 through the cheese joint 30, passes through the drain hopper 40, and is drained to the drain pipe 42. For this reason, the inside of the downstream water discharge pipe 12b that is downstream of the cheese joint 30 can be made empty.

However, the hot water and the expanded water remaining in the upstream water discharge pipe 12a and the casing water discharge pipe 14 upstream of the cheese joint 30 are usually the upstream water discharge pipe 12a and the water discharge pipe 14 in the casing. Since there is almost no difference in height, it is difficult to receive the action of gravity and stays for a relatively long time before reaching the cheese joint 30 and draining to the drain pipe 42 via the connecting pipe 32.
For this reason, for example, when not in use at night or the like, the temperature of the expanded water or the like (hereinafter referred to as “retained water”) that has accumulated in the upstream water discharge pipe 12a or the casing water discharge pipe 14 is decreased, and thus stays. There is a risk of germs breeding in the water. Further, a portion of the outlet bypass flow path 70 which will be described later is located on the downstream side of the outlet solenoid valve 72, the in-casing water supply pipe 52 and the bypass pipe 58 and the hot water mixing valve 14a which are located downstream of the outlet hot water solenoid valve 68. Water is also open to the atmosphere through the spout 22 of the automatic faucet 20, and there is a risk that germs will propagate due to a decrease in temperature.

  Therefore, in the primary water heater system A according to this embodiment, based on the opening / closing operation of the flow path opening / closing means 60, the normal water that flows out from the water outlet 22 of the automatic faucet 20 flows out from the water supply source WS. In addition to discharging water, a predetermined amount of water supplied from the water supply source WS is periodically flowed to the upstream side of the cheese joint 30 in the secondary side passage 56, and the accumulated water is passed through the cheese joint 30. At the same time, so-called water is discharged to the outside. By the replacement of this water, the accumulated water in the upstream side of the cheese joint 30 in the secondary side channel 56 (the inside of the upstream side water discharge pipe 12a and the water discharge pipe 14 in the casing, the water discharge electromagnetic of the water discharge bypass flow path 70). The part located downstream of the valve 72, the water supply pipe 52 in the casing located on the downstream side of the hot water solenoid valve 68, the bypass pipe 58, and the accumulated water staying in the hot water mixing valve 14a) are replaced, and miscellaneous bacteria propagate. Can be prevented. In addition, the replacement of the water is performed by staying water in the secondary side flow path 56 upstream of the cheese joint 30 (inside of the upstream side water discharge pipe 12a and the water discharge pipe 14 in the casing and in the water discharge bypass flow path 70). The portion located downstream of the solenoid valve 72, the water supply pipe 52 and the bypass pipe 58 located in the downstream of the hot water solenoid valve 68, and the remaining water staying in the hot water mixing valve 14a) are externally connected via the cheese joint 30. The predetermined amount that can be discharged is usually set once a day at a preset time, for example, at night when there are few users, but the timing, frequency, and predetermined amount to be replaced are You may decide freely as needed. In determining the predetermined amount, it is necessary to consider so that the accumulated water between the branch portion 58a of the water supply pipe 52 in the casing and the bypass pipe 58 and the hot water storage tank 16 is discharged to the outside through the cheese joint 30. No. This is because the staying water between the branch portion 58a and the hot water storage tank 16 is heated at a high temperature in the hot water storage tank 16, so that it is not necessary to replace it.

  Next, a specific configuration of the flow path opening / closing means 60 used in the primary water heater system A of the present invention will be described.

  This flow path opening / closing means 60 is provided in the middle of the water supply pipe 52 in the casing and on the upstream side (water supply source WS side) of the branching portion 58a with the bypass pipe 58, and the flow velocity of the water flowing through the water discharge pipe 12 The normal flow rate for guiding water to the downstream water discharge pipe 12b, which is the flow channel on the faucet 20 side, via the cheese joint 30 and the water replacement flow rate that is slower than the normal flow rate for guiding water to the connection pipe 32 via the cheese joint 30 It becomes the structure which can be switched to.

  Specifically, the flow path opening / closing means 60 includes a flow path switching means 66 in which a water supply electromagnetic valve 62 that is an electromagnetic open / close valve on the water supply source WS side and an orifice 64 are provided in parallel, and a downstream side of the flow path switching means 66. The hot water solenoid valve 68 connected to the hot water storage tank 16 side, the flow path switching means 66 and the hot water solenoid valve 68 are branched from each other, and the tip thereof is the secondary side flow path 56, that is, the water discharge pipe 14 in the casing. , A water discharge bypass passage 70 connected in communication with the downstream side of the hot water mixing valve 14a, and a water discharge electromagnetic valve 72 disposed in the middle of the water discharge bypass flow passage 70. The tapping solenoid valve 68 and the tapping solenoid valve 72 correspond to an electromagnetic on-off valve connected in series downstream of the flow path switching means 66.

  Based on the opening / closing operation of the water supply electromagnetic valve 62, the flow path switching means 66 passes through the flow path of water supplied from the water supply source WS and passes through the water supply electromagnetic valve 62 to the hot water solenoid valve 68, and the orifice 64. It is possible to selectively switch to a flow path that passes through the flow path to the water discharge bypass flow path 70.

  That is, the water supply electromagnetic valve 62 is connected to the control unit C, and is opened based on a detection signal from the hand detection sensor S of the automatic faucet 20 so that water passage can be started. As a result, when the water supply electromagnetic valve 62 is opened, the water that has passed through the water supply electromagnetic valve 62 branches in two directions, one reaches the downstream hot water electromagnetic valve 68, and the other passes through the water discharge bypass flow path 70. To the water discharge solenoid valve 72. On the other hand, when the water supply electromagnetic valve 62 is closed, the water supplied from the water supply source WS passes through the orifice 64 without passing through the water supply electromagnetic valve 62.

  The orifice 64 forms a constricted channel inside, and the flow rate of water passing through the orifice 64 is increased by the constricted channel inside the orifice 64, and is proportional to the increase in the flow rate. The static pressure is reduced, and as a result, the downstream flow rate is reduced.

  The hot water solenoid valve 68 is connected to the control unit C, and when “hot water” is selected in the hot water / water switch of the automatic water tap 20, the hot water solenoid valve 68 is based on the detection signal from the hand detection sensor S of the automatic water tap 20. The valve is opened and water can be started.

  The water discharge solenoid valve 72 is connected to the control unit C, and when “water” is selected in the hot water / water switch of the automatic faucet 20, based on the detection signal from the hand detection sensor S of the automatic faucet 20. The valve is opened and water can be started.

  In addition to opening the solenoid valve 72 and the solenoid valve 68 based on the detection signal from the hand detection sensor S of the automatic faucet 20, the controller C is preset for the above-described replacement of water. The valve is opened at the time so that water can be started.

  With this configuration, when “hot water” is selected in the hot water / hot water switch of the automatic water tap 20, when the hand detection sensor S of the automatic water tap 20 detects the user's hand, a predetermined detection signal is sent to the control unit. The control unit C opens the water supply electromagnetic valve 62 and the hot water electromagnetic valve 68 almost simultaneously. When the water supply electromagnetic valve 62 and the hot water electromagnetic valve 68 are opened, the water supplied from the water supply source WS passes through the water supply electromagnetic valve 62 and the hot water electromagnetic valve 68, and the bypass pipe 58 in the water supply pipe 52 in the casing. The branching portion 58a branches in two directions, one flows into the hot water storage tank 16, and the other passes through the bypass pipe 58 and reaches the hot water mixing valve 14a.

  Then, the hot water in the hot water storage tank 16 is pushed up by the amount of water flowing into the hot water storage tank 16, flows out into the upstream water discharge pipe 14b in the casing, and mixed with the water from the bypass pipe 58 in the hot water mixing valve 14a. It becomes warm water at an appropriate temperature, and reaches the cheese joint 30 through the downstream side water discharge pipe 14c and the upstream side water discharge pipe 12a in the casing. At this time, the warm water that passes through the upstream water discharge pipe 12a and reaches the cheese joint 30 maintains a water pressure substantially the same as the water pressure pressurized by the water supply pressure of the water supply source WS. For this reason, the flow rate of the warm water flowing through the upstream water discharge pipe 12a is a relatively high flow rate, that is, a normal flow rate. When the flow rate of the hot water flowing through the upstream water discharge pipe 12a is a normal flow rate, the cheese joint 30 conducts water to the downstream water discharge pipe 12b, and finally the hot water from the water discharge port 22 of the automatic faucet 20 Is discharged.

  Further, when “water” is selected in the hot water / water switch of the automatic faucet 20, when the hand detection sensor S of the automatic faucet 20 detects the user's hand, a predetermined detection signal is sent to the control unit C. The control unit C opens the water supply electromagnetic valve 62 and the water discharge electromagnetic valve 72 almost simultaneously. When the water supply electromagnetic valve 62 and the water discharge electromagnetic valve 72 are opened, the water supplied from the water supply source WS passes through the water supply electromagnetic valve 62 and the water discharge electromagnetic valve 72 and passes through the water supply bypass flow path 70. It reaches to the downstream side of the hot water mixing valve 14a in the casing water discharge pipe 14 (inside casing downstream water discharge pipe 14c), passes through the upstream water discharge pipe 12a, and reaches the cheese joint 30. At this time, the water passing through the upstream water discharge pipe 12a and reaching the cheese joint 30 maintains substantially the same water force as the water force pressurized by the water supply pressure of the water supply source WS. For this reason, the flow rate of the water flowing through the upstream water discharge pipe 12a is a relatively high flow rate, that is, a normal flow rate. When the flow rate of the water flowing through the upstream water discharge pipe 12a is a normal flow rate, the cheese joint 30 conducts water to the downstream water discharge pipe 12b, and finally water from the water discharge port 22 of the automatic faucet 20 Is discharged.

  When the user's hand washing is completed, the hand detection sensor S of the automatic faucet 20 does not detect the user's hand and the predetermined detection signal is not transmitted to the control unit C, the control unit C is configured to supply the water supply electromagnetic valve 62. And the hot water solenoid valve 68 or the water supply solenoid valve 62 and the water discharge solenoid valve 72 are closed, and water discharge from the water outlet 22 of the automatic faucet 20 is stopped. When the water discharge is stopped, the warm water or water in the downstream water discharge pipe 12b is subjected to the action of gravity based on the height difference, flows into the connecting pipe 32 via the cheese joint 30, and passes through the drain hopper 40 to be drained. It is drained to the pipe 42. For this reason, the inside of the downstream water discharge pipe 12b can be made empty. However, stagnant water remains in the upstream water discharge pipe 12a and the casing water discharge pipe 14 upstream of the cheese joint 30. For this reason, for example, when not in use at night or the like, the temperature of the staying water is lowered, and there is a possibility that germs propagate in the staying water. In addition, a portion of the bypass flow passage 70 that is located downstream of the water discharge solenoid valve 72, the water supply pipe 52 in the casing and the bypass pipe 58 that are located downstream of the hot water solenoid valve 68, and the accumulated water in the hot water mixing valve 14a. However, it is in an open state through the spout 22 of the automatic faucet 20, and there is a risk that germs will propagate due to a decrease in temperature.

  On the other hand, at the time of water replacement, the control unit C opens the water discharge electromagnetic valve 72 and the hot water electromagnetic valve 68 at a preset time such as at night. When the water discharge electromagnetic valve 72 is opened, the water supplied from the water supply source WS passes through the orifice 64 and passes through the water discharge bypass flow path 70 and is downstream of the hot water mixing valve 14a in the water discharge pipe 14 in the casing. When the hot water solenoid valve 68 is opened, the water supplied from the water supply source WS passes through the hot water solenoid valve 68, and the branching portion 58a of the water supply pipe 52 in the casing with the bypass pipe 58 is provided. Branching in two directions, one flows into the hot water storage tank 16, the other passes through the bypass pipe 58 and reaches the hot water mixing valve 14a, and further to the upstream water discharge pipe 12a downstream. As a result, the remaining water remaining in the upstream water discharge pipe 12a is finally pushed to the downstream side, and finally reaches the cheese joint 30. At this time, since the flow rate of the water supplied from the water supply source WS is reduced by passing through the orifice 64, the water flow decreases before reaching the upstream water discharge pipe 12a. Therefore, the flow rate of water reaching the upstream water discharge pipe 12a is a relatively slow flow rate, that is, a water replacement flow rate that is slower than the normal flow rate. When the flow rate of the water flowing through the upstream water discharge pipe 12a is the water replacement flow rate, the cheese joint 30 will guide water to the connecting pipe 32, and the water guided to the connecting pipe 32 will flow down the connecting pipe 32. Then, it is discharged to the drain pipe 42 via the drain hopper 40. Accordingly, the upstream water discharge pipe 12 a, the casing water discharge pipe 14, the portion located downstream of the water discharge electromagnetic valve 72 of the water discharge bypass flow path 70, and the water supply pipe inside the casing located downstream of the hot water discharge electromagnetic valve 68. The accumulated water remaining inside the 52, the bypass pipe 58 and the hot water mixing valve 14a can be discharged to the drain pipe 42.

  Then, when a predetermined amount is discharged from the opening of the water discharge electromagnetic valve 72 and the hot water electromagnetic valve 68, the control unit C closes the water discharge electromagnetic valve 72 and the hot water electromagnetic valve 68 and ends the replacement of water. The predetermined amount may be measured with a predetermined time passage or with a built-in flow meter.

  Thus, at the time of water replacement, water having a water replacement flow rate slower than the normal flow rate is caused to flow through the upstream water discharge pipe 12 a and the casing water discharge pipe 14 by the opening / closing operation of the flow path opening / closing means 60, and through the cheese joint 30. By guiding water to the connecting pipe 32, the upstream side water discharge pipe 12 a and the inside of the casing water discharge pipe 14, a portion located downstream of the water discharge electromagnetic valve 72 of the water discharge bypass flow path 70, and downstream of the hot water discharge electromagnetic valve 68. The remaining water remaining in the in-casing water supply pipe 52, the bypass pipe 58, and the hot water mixing valve 14a located on the side can be discharged to the drain pipe 42. For this reason, it is possible to prevent germs from breeding in the staying water.

  Moreover, at the time of water replacement, the flow rate of water flowing through the upstream water discharge pipe 12a and the casing water discharge pipe 14 is a water replacement flow speed slower than the normal flow rate due to a decrease in the flow rate accompanying the flow of the orifice 64. The water for water replacement can be prevented from being discharged from the faucet 20 without being led to the flow path on the faucet 20 side through the cheese joint 30. As a result, the user does not feel uncomfortable due to unintentional water discharge from the faucet 20 or misunderstand that the water stoppage failure of the faucet 20 has occurred, and the effect of improving the appearance. Can be obtained.

  The flow path opening / closing means 60 described above is not limited to the above embodiment. For example, the flow path switching means 66 provided in the flow path opening / closing means 60 has a configuration in which the water supply electromagnetic valve 62 and the orifice 64 are separately provided in parallel, but instead, the water supply electromagnetic valve 62 and the orifice 64 are provided. It is good also as a flow control valve which made 1 unit. Thereby, the effect which prevents that the water for water replacement is discharged from the faucet 20 like the above-mentioned thing can be acquired.

(Second Embodiment)
Next, another embodiment of the former water heater system of the present invention will be described with reference to FIG. The main water heater system A1 according to the second embodiment is provided with a check valve 82 instead of the flow path switching means 66, and the water discharge flow path opening / closing means that is the water discharge flow path opening / closing means in the middle of the downstream water discharge pipe 12b. The point provided with the electromagnetic valve 84 is different from the former stop water heater system A according to the first embodiment described above. Other configurations are the same as those of the primary water heater system A according to the first embodiment, and thus the description thereof is omitted.

  FIG. 2 is a schematic explanatory view showing an overall configuration of a main-stop water heater system A1 according to the second embodiment of the present invention. In addition, the same code | symbol was attached | subjected to the part which has the same part or the same function.

  As shown in FIG. 2, in the primary water heater system A <b> 1 according to the second embodiment, the flow path opening / closing means 60 is provided on the check valve 82 and on the downstream side of the check valve 82 (on the hot water tank 16 side). The hot water solenoid valve 68, the check valve 82, and the hot water solenoid valve 68 are branched from the front end, and the leading end thereof is the secondary side flow path 56, that is, the downstream side of the hot water mixing valve 14 a in the casing water discharge pipe 14. And a water discharge electromagnetic valve 72 disposed in the middle of the water discharge bypass flow path 70. The check valve 82 prevents water flowing through the in-casing water supply pipe 52 from flowing backward to the water supply source WS.

  Further, a water discharge flow path opening / closing electromagnetic valve 84 is provided in the middle of the downstream water discharge pipe 12 b that is downstream of the cheese joint 30 in the water discharge pipe 12. The water discharge passage opening / closing electromagnetic valve 84 is connected to the control unit C, and is closed at a time set in advance in the control unit C so that water flow can be stopped. That is, the water discharge flow path opening / closing electromagnetic valve 84 is a normally open type electromagnetic opening / closing valve that is opened when power is not supplied, and is controlled by the control unit C to be closed (closed) when water is replaced. .

  With this configuration, when “hot water” is selected in the hot water / hot water switch of the automatic water tap 20, when the hand detection sensor S of the automatic water tap 20 detects the user's hand, a predetermined detection signal is sent to the control unit. The control unit C opens the hot water solenoid valve 68. When the hot water electromagnetic valve 68 is opened, the water supplied from the water supply source WS passes through the hot water electromagnetic valve 68 and branches in two directions at a branching portion 58a with the bypass pipe 58 in the water supply pipe 52 in the casing. One flows into the hot water storage tank 16, and the other passes through the bypass pipe 58 and reaches the hot water mixing valve 14a.

  Then, the hot water in the hot water storage tank 16 is pushed up by the amount of water flowing into the hot water storage tank 16 and flows out into the water discharge pipe 14 in the casing, and is mixed with the water from the bypass pipe 58 by the hot water mixing valve 14a. It becomes warm water and passes through the upstream water discharge pipe 12 a to reach the cheese joint 30. At this time, the warm water that passes through the upstream water discharge pipe 12a and reaches the cheese joint 30 maintains a water pressure substantially the same as the water pressure pressurized by the water supply pressure of the water supply source WS. For this reason, the flow rate of the warm water flowing through the upstream water discharge pipe 12a is a relatively high flow rate, that is, a normal flow rate. When the flow rate of the warm water flowing through the upstream water discharge pipe 12a is a normal flow rate, the cheese joint 30 guides water to the downstream water discharge pipe 12b. At this time, since the water discharge passage opening / closing electromagnetic valve 84 is opened, the flow of hot water inside the downstream water discharge pipe 12b is not interrupted, and the hot water that has passed through the water discharge passage opening / closing electromagnetic valve 84 is Thus, water is discharged from the water outlet 22 of the automatic faucet 20.

  Further, when “water” is selected in the hot water / water switch of the automatic faucet 20, when the hand detection sensor S of the automatic faucet 20 detects the user's hand, a predetermined detection signal is sent to the control unit C. The control part C opens the water discharge solenoid valve 72. When the water discharge electromagnetic valve 72 is opened, the water supplied from the water supply source WS passes through the water discharge electromagnetic valve 72, passes through the water discharge bypass flow path 70, and the hot water mixing valve in the water discharge pipe 14 in the casing. 14a reaches the downstream side (upstream discharge pipe 14b in the casing), passes through the downstream discharge pipe 14c in the casing, passes through the upstream discharge pipe 12a, and reaches the cheese joint 30. At this time, the water passing through the upstream water discharge pipe 12a and reaching the cheese joint 30 maintains substantially the same water force as the water force pressurized by the water supply pressure of the water supply source WS. For this reason, the flow rate of the water flowing through the upstream water discharge pipe 12a is a relatively high flow rate, that is, a normal flow rate. When the flow rate of the water flowing through the upstream water discharge pipe 12a is a normal flow rate, the cheese joint 30 conducts water to the downstream water discharge pipe 12b, and finally water from the water discharge port 22 of the automatic faucet 20 Is discharged.

  When the user's hand washing is completed, the hand detection sensor S of the automatic faucet 20 does not detect the user's hand, and when the predetermined detection signal is not transmitted to the control unit C, the control unit C controls the hot water solenoid valve 68. Alternatively, the water discharge solenoid valve 72 is closed, and water discharge from the water discharge port 22 of the automatic faucet 20 is stopped. When the water discharge is stopped, the hot water in the downstream water discharge pipe 12b receives the action of gravity based on the height difference and flows into the connecting pipe 32 via the cheese joint 30, passes through the drainage hopper 40, and drains the pipe 42. Drained into the water. For this reason, the inside of the downstream water discharge pipe 12b can be made empty. However, stagnant water remains in the upstream water discharge pipe 12 a and the casing water discharge pipe 14.

  On the other hand, at the time of replacement of water, for example, the control unit C opens the water discharge electromagnetic valve 72 and the hot water electromagnetic valve 68 at a preset time such as at night, and closes the water discharge passage opening / closing electromagnetic valve 84. To do. When the water discharge electromagnetic valve 72 is opened, the water supplied from the water supply source WS reaches the downstream side of the hot water mixing valve 14a in the water discharge pipe 14 in the casing via the water discharge bypass flow path 70. Further, when the hot water electromagnetic valve 68 is opened, the water supplied from the water supply source WS passes through the hot water electromagnetic valve 68 and is bi-directional at a branching portion 58a of the water supply pipe 52 in the casing with the bypass pipe 58. One flows into the hot water storage tank 16, the other passes through the bypass pipe 58 and reaches the hot water mixing valve 14a, and further reaches the upstream water discharge pipe 12a on the downstream side. The accumulated water remaining in the side water discharge pipe 12a is finally pushed to the downstream side while reaching the cheese joint 30. At this time, the flow rate of the water supplied from the water supply source WS does not decrease even if it passes through the check valve 82, and the water flow does not decrease so much even if it reaches the upstream water discharge pipe 12a. Accordingly, the flow rate of water reaching the upstream water discharge pipe 12a is a relatively high flow rate, that is, a normal flow rate. When the flow rate of the water flowing through the upstream water discharge pipe 12a is a normal flow rate, the cheese joint 30 conducts water to the downstream water discharge pipe 12b.

  However, even if water is introduced to the downstream water discharge pipe 12b, the water discharge flow path opening / closing electromagnetic valve 84 is closed, so that the water flow is interrupted in the middle of the downstream water discharge pipe 12b, and the automatic faucet 20 No water is discharged from the water outlet 22. Therefore, water stays in the downstream water discharge pipe 12b, and water also stays in the cheese joint 30 and the upstream water discharge pipe 12a disposed on the upstream side of the downstream water discharge pipe 12b. It will be. Therefore, the flow rate of water reaching the upstream water discharge pipe 12a is a relatively slow flow rate, that is, a water replacement flow rate that is slower than the normal flow rate. When the flow rate of the water flowing through the upstream water discharge pipe 12a is the water replacement flow rate, the cheese joint 30 will guide water to the connecting pipe 32, and the water guided to the connecting pipe 32 will flow down the connecting pipe 32. Then, it is discharged to the drain pipe 42 via the drain hopper 40. Accordingly, the upstream water discharge pipe 12 a, the casing water discharge pipe 14, the portion located downstream of the water discharge electromagnetic valve 72 of the water discharge bypass flow path 70, and the water supply pipe inside the casing located downstream of the hot water discharge electromagnetic valve 68. The accumulated water remaining inside the 52, the bypass pipe 58 and the hot water mixing valve 14a can be discharged to the drain pipe 42.

  When a predetermined amount is discharged from the opening of the water discharge electromagnetic valve 72 and the hot water discharge electromagnetic valve 68 and the closing of the water discharge passage opening / closing electromagnetic valve 84, the control unit C closes the water discharge electromagnetic valve 72 and the hot water discharge electromagnetic valve 68. At the same time, the water discharge passage opening / closing electromagnetic valve 84 is opened, and the replacement of water is completed. The predetermined amount may be measured with a predetermined time passage or with a built-in flow meter.

  Thus, at the time of replacement of water, the flow rate opening and closing means 60 opens and closes the water at a normal flow rate through the upstream water discharge pipe 12a and the casing water discharge pipe 14 upstream of the cheese joint 30 to open the cheese joint. Even if water is introduced into the faucet 20 side through 30, the water discharge passage opening / closing electromagnetic valve 84 is closed, so that the water discharge pipe 12, the water discharge pipe 14 in the casing, and the water discharge bypass flow path 70 are The portion located downstream of the outlet solenoid valve 72, the water supply pipe 52 in the casing and the bypass pipe 58 located downstream of the outlet solenoid valve 68, and the remaining water remaining in the hot water mixing valve 14a are discharged to the drain pipe 42. can do. For this reason, it is possible to prevent germs from breeding in the staying water.

  In addition, when the water is replaced, the water discharge passage opening / closing electromagnetic valve 84 provided in the middle of the downstream water discharge pipe 12b is closed, so that the water flow in the downstream water discharge pipe 12b is blocked. Thus, the water for water replacement can be prevented from being discharged from the faucet 20. As a result, the user does not feel uncomfortable due to unintentional water discharge from the faucet 20 or misunderstand that the water stoppage failure of the faucet 20 has occurred, and the effect of improving the appearance. Can be obtained.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, in the first and second embodiments described above, as shown in FIG. 3, the water discharge bypass flow path 70 and the water discharge electromagnetic valve 72 may not be provided. For the sake of simplicity, FIG. 3 shows only a configuration in which the water discharge bypass flow path 70 and the water discharge electromagnetic valve 72 are not provided in the main water heater system according to the first embodiment.

  In this case, the faucet 20 is not provided with a hot / cold water switch, and is configured to discharge hot water having an appropriate temperature supplied from the electric water heater 10 to the bowl portion B <b> 2 of the hand-washer B from the water outlet 22.

  Under such a configuration, at the time of replacement of water, the control unit C opens the hot water solenoid valve 68. Thereby, the water supplied from the water supply source WS passes through the orifice 64 and the hot water solenoid valve 68, branches as described above, branches at the branching portion 58a, and the water and hot water storage from the bypass pipe 58 at the hot water mixing valve 14a. After the hot water in the tank 16 is mixed and becomes hot water having an appropriate temperature, it reaches the cheese joint 30, flows down the connecting pipe 32, and is discharged to the drain pipe 42 via the drain hopper 40. That is, in the same manner as described above, the water discharge pipe 12, the casing water discharge pipe 14, the casing water supply pipe 52, the bypass pipe 58, and the hot water mixing valve 14a located downstream of the hot water solenoid valve 68 are provided. The staying water remaining inside can be discharged to the drain pipe 42 and the water can be replaced, and the same effect can be obtained.

  The effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS It is typical explanatory drawing which shows the whole structure of the non-stop type water heater system which concerns on 1st Embodiment of this invention. It is typical explanatory drawing which shows the whole structure of the non-stop water heater system which concerns on 2nd Embodiment of this invention. It is typical explanatory drawing which shows the modification of the main stop | fastening water heater system which concerns on embodiment of this invention.

Explanation of symbols

10 Original water heater (electric water heater)
10a Water outlet 12 Water discharge pipe 12b Water faucet side flow path (downstream water discharge pipe)
16 Hot water storage tank 20 Water faucet 30 Cheese joint 32 Connection pipe 40 Drainage hopper 42 Drainage pipe 60 Flow path opening / closing means 62 Electromagnetic on-off valve (water supply electromagnetic valve)
64 Orifice 66 Flow path switching means 68 Electromagnetic on-off valve (Tapping solenoid valve)
84 Water discharge flow path opening / closing means (water discharge flow path opening / closing solenoid valve)
A Original water heater system A1 Main water heater system

Claims (2)

A main water heater having a channel opening / closing means on the upstream side of the hot water tank;
A cheese joint provided in the middle of a water discharge pipe connecting the water outlet and the faucet of the former water heater,
When one end is connected to a connecting pipe branched from the cheese joint and the other end is connected to a drain hopper, and the cheese joint has a slow flow rate of water flowing through the water discharge pipe. In the non-stop water heater system configured to guide water to the connecting pipe and guide water to the faucet side without causing water to flow out to the connecting pipe when the flow rate is high,
The channel opening / closing means guides the flow rate of the water flowing through the water discharge pipe to the connecting pipe through the cheese joint and the normal flow rate for guiding the flow rate to the faucet side channel through the cheese joint. A non-stop water heater system that can be switched to a water replacement flow rate that is slower than the normal flow rate. The flow path opening / closing means comprises a flow path switching means in which an electromagnetic open / close valve and an orifice are provided in parallel, and an electromagnetic open / close valve connected in series downstream of the flow path switching means. Item 1. A water heater system according to item 1.

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