JP2013148312A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater in which drainage performance of expanding water and bath-water drainage in a drain plug is improved.SOLUTION: A storage type water heater includes: a first drain pipe 51 that is connected to a lower part of a hot-water storage tank 1; a second drain pipe 13 that communicates with an upper part of the hot-water storage tank 1 and drains expanding water from a relief valve 3 for draining the expanding water; a third drain pipe 31 that drains backflow water from a backflow prevention means 10 for preventing backflow from a bath tub 28 to the hot-water storage tank 1; and a drain plug 2 having a first passage 33 connected with the first drain pipe 51, a second passage 34 connected with the second drain pipe 13, and a third passage 35 connected with the third drain pipe 31. The second passage 34 and the third passage 35 are configured to be connected to each other so that one of the center axes in the longitudinal direction in the passages is in a substantially vertical direction and the other of the center axes in the longitudinal direction is inclined at a sharp angle with respect to the vertical direction.

Description

  The present invention relates to a drain plug for draining a hot water storage type water heater.

  Conventionally, this type of hot water storage type water heater is generally provided with a drain plug at the bottom of the hot water tank for draining the hot water tank, but in order to improve piping workability, There has been disclosed a drain plug that collects drainage such as drainage of expanded water at the time of raising and drains the drainage (for example, see Patent Document 1).

  The drain plug of the conventional hot water storage type hot water heater has a structure shown in FIGS. 4 and 5, the drain plug is a first connection port 53 for connecting a drain pipe of a hot water storage tank, an on-off valve 30 for opening / closing the drain of the hot water storage tank, and a drain for guiding the waste water to the outside of the appliance. A passage 7 is provided.

  Further, a second connection port 54 which is another drainage connection port is provided, and a connection port 5 for connecting the conduit 4 for guiding the expanded water drained from the relief valve, and a backflow of bath water to prevent backflow. It has a structure branched to a plurality of discharge pipe connection ports 12 for connecting a discharge pipe 11 for guiding bath water drainage discharged from the backflow prevention means with drain plug function.

  And the expansion water passage 6 connected to each connection port of the connection port 5 of the conduit 4 and the connection port 12 of the discharge pipe 11 is provided to prevent the backflow of the expansion water and bath water drained from the relief valve, and the intake drain plug The bath water drainage discharged from the functioned backflow prevention means is drained from the same expanded water passage 6.

JP 2010-2061 A

  However, the drain plug configuration of the conventional hot water storage type hot water heater is such that the expansion water passage 6 in which the drainage passage of the expansion water communicates with the drainage passage of the bath water drainage discharged from the backflow prevention means with the intake drainage plug function in the horizontal direction. For this reason, there is a problem that when the amount of the expansion water and bath water drainage is small, the expansion water stays in the expansion water passage 6 and the outlet of the expansion water passage 6 is blocked due to freezing of the remaining water in severe cold.

  This invention solves the said conventional subject, and it aims at providing the hot water storage type hot-water supply machine which improved the drainage performance of the expansion water and bath water drainage in a drain plug.

  In order to solve the above-mentioned conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank that stores hot water, a first drain pipe that is connected to a lower part of the hot water storage tank and drains the hot water in the hot water storage tank, A relief valve for draining the expansion water in communication with the upper part of the hot water storage tank, a second drainage pipe for draining the expansion water from the relief valve, and a backflow prevention means for preventing a backflow from the bathtub to the hot water storage tank A third drainage pipe for draining the backflow water from the backflow prevention means, a first passage connected to the first drainage pipe, a second passage connected to the second drainage pipe, and the third drainage pipe A drain plug having a third passage connected to the first passage, wherein one longitudinal center line of the second passage and the third passage is substantially vertical, and the other longitudinal center line is perpendicular to the vertical direction. In particular, it is configured to connect each other at an acute angle. It is an.

  As a result, even when there is a small amount of expansion water and bath water drainage in severe cold, the retention of expansion water and bath water drainage does not occur, so the outlet of the expansion water passage is not blocked by freezing of residual water Inflating water and bath water drainage can be drained.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type hot-water supply machine which improved the drainage performance of the expansion water and bath water drainage in a drain plug can be provided.

The block diagram of the hot water storage type hot water heater in Embodiment 1 of this invention External view of the drain plug Cross section of the drain plug Sectional view of the open state of the drain tap of a conventional hot water storage type water heater Sectional view of the open state of the drain tap of a conventional hot water storage type water heater

  A hot water storage type water heater according to a first aspect of the invention is connected to a hot water storage tank for storing hot water, a first drain pipe connected to a lower part of the hot water storage tank for draining hot water in the hot water storage tank, and an upper part of the hot water storage tank. A relief valve for draining the expansion water, a second drain pipe for draining the expansion water from the relief valve, a backflow prevention means for preventing a backflow from the bathtub to the hot water storage tank, and a backflow prevention means A third drain pipe for draining backflow water, a first passage connected to the first drain pipe, a second passage connected to the second drain pipe, and a third passage connected to the third drain pipe. A drain plug having the second passage and the third passage, wherein one longitudinal center line is set to a substantially vertical direction and the other longitudinal center line is inclined at an acute angle with respect to the vertical direction to connect each other. This is a hot water storage type water heater characterized by having a configuration to do so.

  As a result, even when there is a small amount of expansion water and bath water drainage in severe cold, the retention of expansion water and bath water drainage does not occur, so the outlet of the expansion water passage is not blocked by freezing of residual water Inflating water and bath water drainage can be drained.

  The hot water storage type water heater of the second invention is arranged on the upstream side of the drain outlet part of the drain plug, particularly in the first invention, and joins the first passage, the second passage, and the third passage. An aggregation passage through which water flows is provided, and the aggregation passage has a tapered shape that narrows toward the drain outlet portion, and can prevent the stagnation of drainage and the scattering of drainage. . Moreover, even in the specification in which the internal thread processing is performed at the drain outlet portion, it is possible to prevent the drainage from scattering.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water storage type water heater in an embodiment of the present invention. FIG. 2 is an external view of a drain plug of the hot water storage type hot water heater in the embodiment of the present invention. FIG. 3 is a cross-sectional view of the drain plug of the hot water storage type hot water supply apparatus in the embodiment of the present invention.

  In FIG. 1, the hot water storage type water heater of the present invention includes a heat source unit 18 and a hot water storage unit 32. The heat source unit 18 includes a circuit in which a heat source unit 19 configured by a heat pump cycle that compresses the circulating refrigerant to obtain a high temperature and a heat exchange unit 20 are connected. For example, carbon dioxide refrigerant circulates in the heat pump cycle. ing.

  Inside the hot water storage unit 32 covered with the housing, there are a hot water storage tank 1, a water supply pipe 21 for supplying tap water from the lower part of the hot water storage tank 1, a drain plug 2 for draining the hot water storage tank 1, and a lower part of the hot water storage tank 1. A first drain pipe 51 connecting the water tap 2 and the circulation pump 22 for feeding water from the lower part of the hot water storage tank 1 to the heat exchanging unit 20, and a circulation channel for supplying heated hot water to the upper part of the hot water storage tank 1 23, a can body protection valve 16 is provided between the hot water storage tank 1 and the circulation pump 22 to release the pressure to the outside of the appliance when the pressure in the hot water storage tank 1 rises above a predetermined level.

  The hot water supply circuit includes a discharge pipe 24 for extracting hot water from the upper part of the hot water storage tank 1, a relief valve 3 for draining the expanded water being heated, a second drain pipe 13 for guiding the expanded water to the drain plug 2, and a predetermined temperature. And a hot water mixing valve 26 for supplying hot water to the faucet 25.

  Furthermore, the bath circuit mixes a hot water pipe 24 for taking out hot water from the upper part of the hot water storage tank 1, a bath hot water pipe 52 branched from the hot water supply pipe 24, hot water from the hot water storage tank 1 and water from the water supply pipe 21. From the bath mixing valve 27 for supplying hot water to the bathtub 28, the pouring valve 29 for turning on and off the bath water, the backflow prevention means 10 for preventing the backflow of bath water into the hot water storage tank 1, and the backflow prevention means 10 A third drain pipe 31 is provided for guiding the backflow water of the bath to be discharged to the drain plug 2.

  FIG. 2 is an external view of the drain plug. In FIG. 2, the drain plug 2 includes a first passage 33 connected to a first drain pipe 51 for draining hot water in the hot water storage tank 1, and a handle 41 for opening and closing the first passage 33, and from the relief valve 3. A second passage 34 connected to the second drain pipe 13 for draining the expanded water, a third passage 35 connected to the third drain pipe 31 for draining the back-flow water of the bath from the back-flow prevention means 10, and the drainage outside the instrument A drain outlet 40 is provided for discharging to the outlet.

  FIG. 3 is a sectional view of the drain plug and shows an open state of the first passage 33 for draining hot water in the hot water storage tank 1 by opening the handle 41. The 2nd channel | path 34 which drains the expansion water from the relief valve 3 is arrange | positioned in the vicinity of the 1st channel | path 33, and is a normally open state.

  The 3rd channel | path 35 which drains the backflow water of the bath from the backflow prevention means 10 is arrange | positioned in the vicinity of the 1st channel | path 33, and is a normally open state.

  While the second passage 34 is substantially vertical, the third passage 35 is inclined at a constant angle (about 30 ° C.) that is an acute angle. Both passages merge into one aggregate passage 42 in the drain plug 2, and the vertical projection section of the second passage 34 and the vertical projection section of the third passage 35 are within the vertical projection section of the aggregation passage 42. Has been placed. Further, the aggregation passage 42 has a tapered shape that narrows toward the drain outlet 40.

  The operation and effect of the hot water storage type hot water heater configured as described above, which collects all waste water and drains water from the drain outlet 40 to the outside of the hot water storage unit 32 will be described below.

  First, the heating operation for supplying hot water to the hot water storage tank 1 will be described. When the boiling operation is started by the operation unit 55, the heat source unit 19 configured by the heat pump system in the heat source unit 18 supplies the refrigerant to the heat exchange unit 20 while raising the refrigerant temperature.

  On the other hand, in the circulation channel 23, the circulation pump 22 is driven, and the water in the lower part of the hot water storage tank 1 flows into the heat exchanging unit 20, where heat is exchanged from the refrigerant to the water, and the water becomes hot water and becomes a hot water storage tank. 1 is supplied.

At this time, the expanded water in the hot water storage tank 1 is drained from the relief valve 3, passes through the second drain pipe 13, passes through the second passage 34 of the drain plug 2, passes through the second passage outlet 38, and the drain outlet portion 40, and is outside the instrument. Drained into the water. When the expanded water freezes and the second passage outlet 38 is closed at the time of severe cold, the expanded water is not drained, so the pressure in the hot water storage tank 1 rises and the can protection valve 16 is activated to release the pressure in the hot water storage tank 1.

  Next, the operation of the backflow prevention means 10 when the water level in the hot water storage tank 1 is lowered and the internal pressure of the hot water storage tank 1 becomes negative, such as when water is shut off, will be described. When the inside of the hot water storage tank 1 becomes negative pressure, the bath water in the hot tub 28 flows back to the hot water storage tank 1 at atmospheric pressure, and the hot water in the hot water storage tank 1 becomes unsanitary. 10 prevents backflow into the hot water storage tank 1, but the backflow water of the backflowed bath passes through the third drain pipe 31, passes through the third passage 35 of the drain plug 2, the third passage outlet 39, and the drain outlet 40. Then it is drained out of the instrument.

  As described above, one longitudinal center line of the second passage 34 for draining the expansion water and the third passage 35 for draining the backflow water of the bath is substantially vertical, and the other longitudinal center line is vertical. In contrast, it is configured to be inclined at a constant angle (about 30 ° C.) that is an acute angle, merges with the first passage 33 and the one aggregation passage 42, and the vertical projection cross section of the second passage 34, In addition, since the vertical projection cross section of the third passage 35 is configured to be disposed within the vertical projection cross section of the aggregation passage 42, even when the amount of the expansion water and the bath water drainage is small, Since the expansion water and the bath water drainage do not stay, the expansion water and the bath water drainage can be drained without closing the outlet of the expansion water passage due to the freezing of the remaining water.

  Furthermore, by forming the aggregation passage 42 into a tapered shape that narrows toward the aggregation passage outlet 43, it is possible to prevent the drainage from being scattered even in a specification in which the drainage outlet portion 40 is internally threaded.

  When not in use for a long time, hot water is drained from the hot water storage tank 1, and the draining operation will be described with reference to FIGS.

  When the stop cock of the water supply pipe 21 is closed, the relief valve 3 is opened, and the handle 41 of the drain plug 2 is opened, the hot water in the hot water storage tank 1 passes through the first passage 33, the first passage outlet 37, the drain outlet. At the same time as the water is drained out of the appliance through the section 40, the air below the drain outlet section 40 passes through the second drain pipe 13 from the second passage outlet 38 and the second passage 34, passes through the relief valve 3, and is stored in the hot water storage tank. Draining continues until it is taken into 1 and the hot water storage tank is empty.

  As described above, the hot water storage type hot water heater according to the present invention can be applied to various heat pump water heaters, and further to an electric water heater using an electric heater as a heat source.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Drain plug 3 Relief valve 10 Backflow prevention means 13 2nd drain pipe 28 Bathtub 31 3rd drain pipe 33 1st channel | path 34 2nd channel | path 35 3rd channel | path 37 1st channel | path exit 38 2nd channel | path exit 39 3rd Passage outlet 40 Drainage outlet 51 First drainage pipe 42 Aggregation path 43 Aggregation path outlet 52 Bath outlet pipe

Claims (2)

A hot water storage tank for storing hot water, a first drain pipe connected to the lower part of the hot water storage tank for draining hot water in the hot water storage tank, a relief valve for draining the expansion water in communication with the upper part of the hot water storage tank, A second drainage pipe for draining the expansion water from the relief valve, a backflow prevention means for preventing a backflow from a bathtub to the hot water storage tank, a third drainage pipe for draining the backflow water from the backflow prevention means, A first passage connected to the first drain pipe, a second passage connected to the second drain pipe, and a drain plug having a third passage connected to the third drain pipe. Among the third passages, the hot water storage system is characterized in that one longitudinal center line is substantially vertical and the other longitudinal center line is connected to each other by being inclined at an acute angle with respect to the vertical direction. Water heater. It is arranged on the upstream side of the drain outlet portion of the drain plug, and includes an aggregation passage through which the combined water of the first passage, the second passage, and the third passage flows, and the aggregation passage is connected to the drain outlet portion. The hot water storage type water heater according to claim 1, wherein the hot water storage type water heater has a tapered shape that narrows toward the water.