JPS6022270Y2 - water heater drainage device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a water heater drainage device.

When draining water from a water heater that supplies water through a check valve to prevent freezing, conventionally, separate drain valves are provided on the downstream and upstream sides of the check valve, making it difficult to drain water. This has the drawback of being troublesome and increasing costs.

This invention corrects such conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In FIG. 1, 1 is a water supply channel in a water heater, and a drainage channel 2 is provided at the lowest part of the water supply channel 1, and this drainage channel 2 is connected to the downstream side 4 of a check valve 3 provided in the water supply channel 1 in the vicinity. Drainage passage 7 that communicates via the water drainage bypass passage 5 and communicates the water drainage bypass passage 5 with the drainage passage 2 and the upstream side 6 of the check valve 3.
It is opened and closed by a drain valve 8 that cuts off communication.

Reference numeral 9 indicates an operating handle of the water drain valve 8, and reference numeral 10 indicates a safety valve provided on the upstream side 6 of the check valve 3 in the water supply channel 1.

2 and 3 show an example of a water heater to which the drainage device of this invention can be applied, in which 11 shows a hot water storage tank, 12 shows a hot water tap, 13 shows a water tap, and FIG. This shows an example of a type water heater, where 14 is a hot water mixing device, and 15 is a hot water mixing device.
is a water supply pipe to the hot water storage tank 11.

Since this device has the above-mentioned structure, when the drain valve 8 is opened, both the drain passage 7 and the water drain bypass passage 5 are opened, so that the residual water on the downstream side 4 of the check valve 3 is also removed via the water drain bypass passage 5. All the water remaining in the hot water tank 11 and the water supply channel 1 can be quickly drained and completely removed from the drain channel 2.

Therefore, both the drainage passage 7 and the drainage bypass passage 5 can be opened and closed simply by operating the operating handle 9 of the drainage valve 8, which saves the trouble of operating two drainage valves as in the conventional case, and improves the structure. It has the advantage of being compact and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIGS. 2 and 3 are schematic diagrams showing an embodiment of piping for a water heater that can be applied to the drainage system of this invention. 1... Water supply channel, 2... Drainage channel, 3...
... Check valve, 4 ... Downstream side of check valve, 5.
... Water drain bypass passage, 6... Upstream side of check valve, 7... Drainage passage, 8... Water drain valve.

Claims (1)

[Scope of utility model registration request] A drainage channel 2 provided at the lowest part of the water supply channel 1 is communicated with a downstream side 4 of a check valve 3 inserted in the water supply channel 1 in the vicinity thereof through a drainage bypass passage 5, and the water drainage bypass passage 5 A water heater drainage device characterized in that the water heater is opened and closed by a drain valve 8 which opens and closes a drainage passage 7 connecting an upstream side 6 of a check valve 3 and a drainage passage 2.