JP2002139251A - Drainage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage which can completely drain the liquid within each liquid reservoir tank without attaching a pipe where a negative pressure valve is interposed to the side of a second liquid reservoir tank. SOLUTION: A hot water supply unit A is constituted by connecting the base end of a drain pipe 12 where a relief valve 11 is interposed to the top of a hot water reservoir tank 1, and connecting the base end 16 of a drain pipe 15 where a drain valve 14 is interposed to the bottom of the hot water reservoir tank 1, and connecting the base end 24 of a drain pipe 23 where a drain valve 22 is interposed to the bottom of a hot water reservoir tank 2, and connecting one end 41 of a coupling pipe 4 to the top of the hot water reservoir tank 2, and connecting the other end to the upstream side of the drain valve 14 of the drain pipe 15, and the position of connection to the drain pipe 15 of the other end 42 of a coupling pipe 4 is arranged higher than the drain section 231 of the drain pipe 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage device for draining liquid from each storage tank in which liquid storage tanks installed at the same horizontal position are connected by a connecting pipe.

[0002]

2. Description of the Related Art For example, in an electric water heater, a tank is generally formed in a cylindrical shape in order to secure pressure resistance.
If the required amount of hot water is to be ensured by one tank, the degree of freedom of the shape of the hot water tank is impaired. Therefore, the hot water storage tanks 102 and 103 are connected by a connecting pipe 101 (see FIG. 8).

[0003] In this electric water heater 100, a base 106 of a drain pipe 105 provided with a relief valve 104 is connected to an upper part of the hot water storage tank 102, and a base of a drain pipe 108 provided with a drain valve 107. Hot water storage tank 10 at end 109
2, a base end 112 of a drain pipe 111 having a drain valve 110 interposed is connected to a lower part of the hot water storage tank 103, one end 113 of the connection pipe 101 is connected to an upper part of the hot water storage tank 103, and the other end 114 is connected. Is connected to the drain pipe 108 upstream of the drain valve 107. In addition, connecting pipe 1
Reference numeral 01 connects a drain pipe 116 provided with a negative pressure valve 115 therebetween.

[0004] The relief valve 104 limits an increase in the tank internal pressure due to volume expansion accompanying a temperature change when water introduced into the hot water storage tank 103 is heated by a heating device (heat pump) and returned to the hot water storage tank 102. It is provided for. Specifically, when the pressure in the hot water storage tank 102 exceeds a predetermined pressure, the valve is opened to communicate with the atmosphere, thereby adjusting the pressure in the hot water storage tanks 102 and 103 to a predetermined pressure or less. When the valve is opened, a small amount of hot water is also discharged, so that the drain pipe 105 is connected to the drain.

When the electric water heater is not used for a long time with the hot water (water) stored in the hot water storage tanks 102 and 103, the hot water (water) in the hot water storage tanks 102 and 103 is removed due to sanitary problems and the like. It is necessary to drain. In this case, the relief valve 104 and the negative pressure valve 115 are opened, and the drain valves 107 and 110 are further opened.

[0006]

The above-mentioned conventional hot water discharger 1
In the case of 00, the cost for the parts for the negative pressure valve 115 and the drain pipe 116, the installation space thereof, and the maintenance are required. An object of the present invention is to provide a drainage device capable of completely draining the liquid in each storage tank without attaching a pipe provided with a negative pressure valve on the second storage tank (hot water storage tank 102) side. On offer.

[0007]

[Means for Solving the Problems] In the drainage device, a base end of a drain pipe provided with an atmosphere release valve is connected to an upper portion of a first storage tank, and a first drainage valve is provided. The base end of the first drainage pipe interposed is connected to the lower part of the first liquid storage tank, and the base end of the second drainage pipe interposed with the second drainage valve is connected to the second liquid storage tank. It is connected to the lower part, one end of the connection pipe is connected to the upper part of the second liquid storage tank, and the other end is connected to the first drain pipe on the upstream side of the first drain valve. The other end of the connection pipe is connected to the first drain pipe at a position higher than the drain portion of the second drain pipe.

When draining the liquid in the first and second storage tanks, the air release valve and the first and second drain valves are opened. First, the liquid in the first storage tank is drained. And since the connection position of the connection pipe to the first drain pipe is higher than the drain section of the second drain pipe,
When the liquid level of the liquid in the first liquid storage tank falls below the connection position, the liquid in the second liquid storage tank starts to be drained through the second drain pipe, so that the liquid in the connection pipe becomes the second liquid. 2 is drawn into the liquid storage tank. The liquid in the connecting pipe is second
Is completely drawn into the second storage tank, the second storage tank is opened to the atmosphere, and the liquid in the second storage tank is drained at a stretch.

[0009] The drainage device can completely drain the liquid in the connection pipe and each storage tank without attaching a pipe provided with a negative pressure valve to the second storage tank side. For this reason, the drainage device can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is interposed in the piping, does not require an installation space, and does not require maintenance.

According to a second aspect of the present invention, in the drainage device, a base end of a drain pipe provided with an air release valve is connected to an upper portion of the first storage tank, and a first drainage valve and a second drainage valve are provided. One end of the drainage pipe interposed is connected to the lower part of the first liquid storage tank, the other end is connected to the lower part of the second liquid storage tank, and one end of the connecting pipe is connected to the upper part of the second liquid storage tank. The other end is connected to a position upstream of the first drain valve of the drain pipe and higher than the drain portion. A drain port is provided at a drain portion of the drain pipe between the first drain valve and the second drain valve.

When the liquid in the first and second storage tanks is drained, the air release valve and the first and second drain valves are opened. First, the liquid in the first storage tank is drained.

Since the connecting position of the connecting pipe to the drainage pipe is higher than the drainage portion, when the liquid level in the first liquid storage tank falls below the connection position, the liquid in the second liquid storage tank is removed. Since the liquid starts to be drained through the drain pipe, the liquid in the connecting pipe is drawn into the second liquid storage tank. When all the liquid in the connection pipe is drawn into the second liquid storage tank, the second liquid storage tank is opened to the atmosphere.
The liquid in the liquid storage tank is drained at once.

[0013] The drainage device can completely drain the liquid in the connection pipe and each storage tank without attaching a pipe provided with a negative pressure valve on the second storage tank side. For this reason, the drainage device can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is interposed in the piping, does not require an installation space, and does not require maintenance. In addition, drainage can be performed from one place.

According to a third aspect of the present invention, in the drainage device, a base end of a drain pipe provided with an atmosphere release valve is connected to an upper portion of the first storage tank, and a first drainage valve provided with a first drainage valve is provided. And a base end of a second drainage pipe having a second drainage valve connected thereto is connected to a lower end of the second storage tank. One end of the pipe is connected to the upper part of the second liquid storage tank, and the other end is connected to the lower part of the first liquid storage tank. Then, a drain pipe provided with a drain plug is connected to a drainage portion of the connection pipe.

When the liquid in the first and second storage tanks is drained, the air release valve, the first and second drain valves, and the drain plug are opened. First, the liquid in the first storage tank is drained. Since the drainage pipe provided with the drainage plug is connected to the drainage portion of the connection pipe, when the liquid in the first liquid storage tank escapes, the liquid in the connection pipe starts to drain from the drainage pipe, When cut, the inside of the second liquid storage tank is opened to the atmosphere, so that the liquid in the second liquid storage tank is drained at once from the second drain pipe.

[0016] The drainage device can completely drain the liquid in the connection pipe and each storage tank without attaching a pipe provided with a negative pressure valve on the second storage tank side. For this reason, the drainage device can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is interposed in the piping, does not require an installation space, and does not require maintenance.

[Fourth Aspect] The drainage device has the configuration according to any one of the first to third aspects, and is the same as the connection of the second storage tank to the first storage tank. One or more tank piping structures having a structure are connected in series at the subsequent stage of the second liquid storage tank. The drainage device completely drains the liquid in the connection pipe and each storage tank without attaching the second storage tank side, and the storage tank side connected to the subsequent stage, and the pipe provided with a negative pressure valve. be able to. For this reason, in the drainage device, the cost for parts related to the negative pressure piping structure in which the negative pressure valve is provided in the piping can be reduced, the space for disposing them is unnecessary, and further, the maintenance thereof is unnecessary. .

[0018]

Next, a first embodiment (corresponding to claim 1) of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the hot water supply apparatus A includes hot water storage tanks 1 and 2 for storing hot water for hot water supply, and a heating device (not shown) for producing hot water, and employs a drainage mechanism described later. I have.

Hot water storage tanks 1 and 2 are cylindrical and each have a capacity of 150 liters. A drain pipe 12 interposed with a relief valve 11 (atmosphere release valve) is connected to an upper portion of the hot water storage tank 1, and a hot water pipe 13 for hot water supply branches from the drain pipe 12. Further, a tapping pipe 31 of the heating device is connected to the tank upper side.

The hot water storage tanks 1 and 2 increase the internal pressure of the tank due to the expansion of the volume of water due to hot water.
1 keeps the pressure below a certain level. At the lower part of the hot water storage tank 1, a base 1 of a drainage pipe 15 with a drainage valve 14 interposed
6 are connected.

Water is supplied to the hot water storage tank 2 from a water supply source via a water supply pipe 21 connected to a lower portion of the tank and provided with a pressure reducing valve (not shown). The pressure reducing valve has a function of reducing the supply pressure of water supplied from the water supply source and maintaining the supply pressure at or below a predetermined pressure. Further, at other positions under the hot water storage tank 2, a water supply pipe 32 of a heating device and a drain valve 22 are provided.
The base end 24 of the drain pipe 23 interposed is connected.

Reference numeral 4 denotes a connecting pipe having one end 41 connected to the upper portion of the hot water storage tank 2 and the other end 42 connected to the drain pipe 15 upstream of the drain valve 14. In addition, connecting pipe 4
Is connected to the drain pipe 15 at the other end 42 of the drain pipe 2
3 is higher than the drainage portion 231 (the horizontally extending portion of the drainage pipe 23) and forms a main part of the drainage mechanism.

The heating device supplies water from the water supply pipe 32 into the hot water storage tank 2, and sends the produced hot water to the upper part of the hot water storage tank 1 via the hot water supply pipe 31. The hot water sent to the upper portion of the tank faces the upper portion of the hot water storage tank 1 due to a specific gravity difference between the hot water and the cold water, and is stored sequentially from the upper portion.

The approximate amount of hot water stored in the hot water storage tanks 1 and 2 is detected by thermistors (not shown) disposed at respective volume positions of the hot water storage tanks 1 and 2.

Next, the operation of the drainage mechanism in the hot water supply apparatus A when draining hot water (water) in the hot water storage tanks 1 and 2 will be described. If hot water supply device A is not used for more than a few days while hot water (water) is stored in hot water storage tanks 1 and 2,
It is necessary to drain hot water (water) in the hot water storage tanks 1 and 2 due to sanitary problems and the like. In this case, the relief valve 11 is manually opened, and both the drain valves 14 and 22 are opened.

Thus, first, the hot water in the hot water storage tank 1 is drained. Since the connection position of the connection pipe 4 to the drain pipe 15 is higher than the drain portion 231 of the drain pipe 23 (the horizontally extending portion of the drain pipe 23), the liquid level of the hot water in the hot water storage tank 1 is higher than the connection position. If it falls below, hot water storage tank 2
Since the hot water in the inside starts to be drained through the drain pipe 23, the hot water in the connection pipe 4 is drawn into the hot water storage tank 2. When all the hot water in the connection pipe 4 is drawn into the hot water storage tank 2,
Since the inside of the hot water storage tank 2 is opened to the atmosphere, the hot water in the hot water storage tank 2 is drained at a stretch.

The hot water supply apparatus A of this embodiment has the following advantages. The hot water supply device A can completely drain hot water (water) from the connecting pipe 4 and the hot water storage tanks 1 and 2 without providing a pipe provided with a negative pressure valve on the hot water storage tank 2 side. For this reason, the hot-water supply device A can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is provided in the piping.

Since there is no projecting portion occupied by the negative pressure piping structure in which the negative pressure valve is provided in the piping, heat insulation is facilitated and the heat retention performance is improved. There is no danger of drainage failure due to sticking of the negative pressure valve, and since there is no negative pressure valve, maintenance of the negative pressure valve is unnecessary.

Next, a second embodiment (corresponding to claim 2) of the present invention will be described with reference to FIG. Hot water supply device B shown in FIG. 3 differs from hot water supply device A in the following configuration. Drain valve 1
4 and one end 201 of the drainage pipe 20 with the drainage valve 22 interposed, is connected to the lower part of the hot water storage tank 1, and the other end 202 is connected to the lower part of the hot water storage tank 2. A drain port is provided at the portion 203 (the horizontal portion of the drain pipe 20).

Reference numeral 4 denotes a connecting pipe having one end 41 connected to the upper part of the hot water storage tank 2 and the other end 42 connected to the drain pipe 20 at a position upstream of the drain valve 14. In addition, connecting pipe 4
Is connected to the drain pipe 20 at the other end 42 of the drain pipe 2
This is a position higher than the drainage portion 203 of No. 0, and forms a main part of the drainage mechanism.

Next, the operation of the drainage mechanism in the hot water supply device B when draining hot water (water) in the hot water storage tanks 1 and 2 will be described. When the hot water (water) in the hot water storage tanks 1 and 2 is drained, the relief valve 11 is manually opened, and both the drain valves 14 and 22 are opened.

First, the hot water (water) in the hot water storage tank 1 is drained. Since the connection position of the connection pipe 4 to the drainage pipe 20 is higher than the drainage portion 203, when the liquid level of the hot water in the hot water storage tank 1 falls below the connection position, the hot water storage tank 2
Since the hot water in the inside starts to be drained through the drain pipe 23, the hot water in the connection pipe 4 is drawn into the hot water storage tank 2. When all the hot water in the connection pipe 4 is drawn into the hot water storage tank 2,
Since the inside of the hot water storage tank 2 is opened to the atmosphere, the liquid in the hot water storage tank 2 is drained at a stretch.

The hot water supply apparatus B of this embodiment has the following advantages. The hot water supply apparatus B can completely drain hot water (water) from the connection pipe 4 and the hot water storage tanks 1 and 2 without providing a pipe provided with a negative pressure valve on the hot water storage tank 2 side. For this reason, the hot water supply apparatus B can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is provided in the piping.

Since there is no projection occupied by the negative pressure piping structure in which the negative pressure valve is provided in the piping, heat insulation is facilitated and the heat retention performance is improved. There is no danger of drainage failure due to sticking of the negative pressure valve, and since there is no negative pressure valve, maintenance of the negative pressure valve is unnecessary. Since drainage can be performed from one place, it is easy to manage drainage pipes.

Next, a third embodiment of the present invention (corresponding to claim 3) will be described with reference to FIG. Hot water supply device C shown in FIG. 4 differs from hot water supply device A in the following configuration. One end 41 of the connection pipe 4 is connected to the upper part of the hot water storage tank 2, the other end 42 is connected to the lower part of the hot water storage tank, and a drainage pipe 44 provided with a drain plug 43 is connected to a drainage part 45 of the connection pipe 4 (connection pipe). 4 horizontal part).

Next, the operation of the drainage mechanism in the hot water supply device C when draining hot water (water) in the hot water storage tanks 1 and 2 will be described. When draining the hot water (water) in the hot water storage tanks 1 and 2, the relief valve 11 is manually opened, the drain valves 14 and 22 are both opened, and the drain plug 43 is opened.

First, the hot water in the hot water storage tank 1 is drained. The drainage pipe 44 provided with the drainage plug 43 is connected to the connection pipe 4
When the hot water in the hot water storage tank 1 is drained, the hot water in the connection pipe 4 starts to drain from the water drain pipe 44, and when the hot water is completely drained, the hot water storage tank 2 is opened to the atmosphere. Hot water in the tank 2 is drained from the drain pipe 23 at a stretch.

The hot water supply device C can completely drain hot water (water) from the connecting pipe 4 and the hot water storage tanks 1 and 2 without providing a pipe provided with a negative pressure valve on the hot water storage tank 2 side.
For this reason, the hot water supply device C can reduce the cost for parts related to the negative pressure piping structure in which the negative pressure valve is provided in the piping.

Since there is no projecting portion occupied by the negative pressure piping structure in which the negative pressure valve is provided in the piping, heat insulation is facilitated and the heat retention performance is improved. There is no danger of drainage failure due to sticking of the negative pressure valve, and since there is no negative pressure valve, maintenance of the negative pressure valve is unnecessary. Since the hot water in the hot water storage tank 1 is drained through two paths, the drainage time can be shortened. In addition, although the drainage pipe 44 provided with the drainage plug 43 is required, it is below the hot water storage tanks 1 and 2 and does not become an obstacle.

The present invention includes the following embodiments in addition to the above embodiment. a. One or more tank piping structures having the same structure as the connection of the hot water storage tank 2 to the hot water storage tank 1 may be connected in series at the subsequent stage of the hot water storage tank 2. For example, as shown in FIG. 5, a hot water supply device D in which a hot water storage tank 5 is added to a hot water supply device A to increase the amount of hot water supply is provided. And connecting pipe 54
One end 55 of the hot water storage tank 5 is connected to the drain pipe 2
The other end 56 is connected to the upstream side of the third drain valve 22. The connection position of the other end 56 of the connecting pipe 54 to the drainage pipe 23 is higher than the drainage portion 50 of the drainage pipe 52 (corresponding to claim 4 cited in claim 1).

When draining the hot water (water) in the hot water storage tanks 1, 2, and 5, the relief valve 11 is manually opened and the drain valves 14, 22, and 51 are both opened. Thus, the connecting pipes 4, 54 and the hot water storage tank 1,
Hot water (water) in 2, 5 can be completely drained.

As shown in FIG. 6, a hot water supply device E in which the hot water supply tank 5 is added to the hot water supply device B to increase the amount of hot water supply is provided. 5, one end 55 of the connecting pipe 54 is connected to the upper part of the hot water storage tank 5, and the other end 56 is connected to the drain pipe 23 on the upstream side of the drain valve 22. The connection position of the other end 56 of the connection pipe 54 to the drain pipe 23 is higher than the drain portion 50 of the drain pipe 52 (corresponding to claim 4 cited in claim 2).

When draining the hot water (water) in the hot water storage tanks 1, 2, and 5, the relief valve 11 is manually opened and the drain valves 14, 22, and 51 are both opened. Thus, the connecting pipes 4, 54 and the hot water storage tank 1,
Hot water (water) in 2, 5 can be completely drained.

Further, as shown in FIG. 7, a hot water supply apparatus F in which a hot water storage tank 5 is added to the hot water supply apparatus C to increase the amount of hot water supply is provided. 5, one end 55 of a connecting pipe 54 is connected to the upper part of the hot water storage tank 5, the other end 56 is connected to the lower part of the hot water storage tank 2, and a drain pipe 58 provided with a drain plug 57 is connected to the connecting pipe. 54 is connected to the drainage portion 59 (claim 3
Corresponding to claim 4).

When draining the hot water (water) in the hot water storage tanks 1, 2, and 5, the relief valve 11 is manually opened, the drain valves 14, 22, 51 are opened together, and the drain plug 43, Open 57. As a result, the connection pipe 4, the connection pipe 4,
Hot water (water) in 54 and hot water storage tanks 1, 2, and 5 can be completely drained.

B. The drain valves 14, 22, 51 and the drain plugs 43, 57 may be electrically driven. c. The liquid may be other than water.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water supply apparatus according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the hot water supply device.

FIG. 3 is a configuration diagram of a hot water supply apparatus according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a hot water supply apparatus according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a hot water supply apparatus according to another embodiment of the present invention.

FIG. 6 is a configuration diagram of a hot water supply apparatus according to another embodiment of the present invention.

FIG. 7 is a configuration diagram of a hot water supply apparatus according to another embodiment of the present invention.

FIG. 8 is a configuration diagram of a hot water supply apparatus according to the related art.

[Explanation of symbols]

 A, B, C, D, E, F Hot water supply device (drainage device) 1 Hot water storage tank (first storage tank) 2 Hot water storage tank (second storage tank) 4 Connecting pipe 11 Release valve (atmosphere release valve) 12) Drain pipe 14 Drain valve (first drain valve) 15 Drain pipe (first drain pipe) 16, 24 Base end 22 Drain valve (second drain valve) 23 Drain pipe (second drain pipe) 41 One end 42 Other end 43, 57 Drainage plug 44, 58 Drainage pipe 50, 231 Drainage part

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Michio Nakagawa 7-7 Higashi Shinbo, Sanjo-shi, Niigata F-term in Corona Co., Ltd. (reference) 3L025 AA06

Claims (4)

[Claims] 1. A base end of a drain pipe provided with an atmosphere release valve is connected to an upper portion of a first liquid storage tank, and a base end of a first drain pipe provided with a first drain valve is connected to the first drainage pipe. 1 is connected to the lower part of the liquid storage tank, the base end of the second drainage pipe provided with the second drainage valve is connected to the lower part of the second liquid storage tank, and one end of the connecting pipe is connected to the second liquid storage tank. In a drainage device connected to an upper portion of a liquid storage tank and having the other end of the first drainage pipe connected to an upstream side of the first drainage valve, the other end of the connection pipe is connected to the first drainage pipe. The drainage device is characterized in that a connection position of the drainage device is higher than a drainage portion of the second drainage pipe. 2. A base end of a drain pipe provided with an atmosphere release valve connected to an upper part of a first liquid storage tank, and one end of a drain pipe provided with a first drain valve and a second drain valve is connected. Connected to the lower part of the first storage tank,
The other end is connected to a lower part of a second liquid storage tank, a drain port is provided in a drain portion of the drain pipe between the first drain valve and the second drain valve, and one end of the connection pipe is connected to the drain port. A drainage device connected to an upper portion of a second liquid storage tank, the other end of the connection pipe being connected to a position upstream of the first drainage valve of the drainage pipe and higher than the drainage portion; 3. A base end of a drain pipe provided with an atmosphere release valve is connected to an upper part of the first liquid storage tank, and a base end of the first drain pipe provided with a first drain valve is connected to the first drainage pipe. 1 is connected to the lower part of the liquid storage tank, the base end of the second drainage pipe provided with the second drainage valve is connected to the lower part of the second liquid storage tank, and one end of the connecting pipe is connected to the second liquid storage tank. A drainage device connected to an upper portion of a liquid storage tank, the other end connected to a lower portion of the first liquid storage tank, and a drainage pipe provided with a drainage plug connected to a drainage portion of the connection pipe. 4. A tank piping structure having the same structure as that of the connection of the second liquid storage tank to the first liquid storage tank is connected in series at least one subsequent stage of the second liquid storage tank. The drainage device according to claim 1.