JPH09280593A - Drain apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a drain apparatus in which a reversed flow of water is prevented from being produced in a drain upon interruption of an operation and specific gas is prevented from invading from the outside by providing a check valve in a drain pipe disposed in the vicinity of a discharge outlet of a drain pump. SOLUTION: Once the operation of a drain pump is started, interlocked with an indoor unit body, an opening/closing valve of a a check valve 20 is pushed and opened with discharge water pressure sucked by the drain pump 3 and fed to a drain hole 6 through a drain hose 7 until it is restricted by a stopper, and drain water 10 is discharged through the drain hose 7 and a drain piping. In contrast, once the drain pump 3 is interrupted, interlocking with the indoor unit body, the drain water 10 in the drain hose 7 reversely flows, and the opening/closing valve opened diagonally with the water pressure and the self weight is pushed down and is brought into close contact with a sealing part 16 and into its closed state. As a result, the drain water 10 in the drain hose 7 is prevented from reversely flowing with a small amount of a back flow to a drain pan 2. Thus, water is prevented from staying in the drain pan 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain device in which water accumulated in a drain pan is pumped out by a drain pump and drained through an upright drain pipe.

[0002]

2. Description of the Related Art FIG. 5 is an overall configuration diagram of an indoor unit body having a built-in drain pump, which is an air conditioner to which a conventional drain device is applied, and FIG. 6 is an enlarged view showing a portion of the drain pump. In FIGS. 5 and 6, a drain pan 2 that serves as a tray for drain water is provided below the heat exchanger 1a in the indoor unit body 1. A recess 2b for accumulating drain water is formed in a part of the bottom surface 2a of the drain pan 2, and the drain pump 3 is provided with the pumping inlet 4 located in the recess 2b. The discharge port 5 of the drain pump 3 and the drain port 6 of the indoor unit body 1 located above are connected by a drain hose 7 as a drain pipe.
A drain pipe 8 is attached to the. The above heat exchanger 1
A plurality of refrigerant pipes 11 are connected to a.

Next, the operation will be described.

In the configuration of FIG. 5, when the cooling operation is performed, the water droplets attached to the heat exchanger 1a drop onto the drain pan 2 and accumulate in the recess 2b to become drain water 10. The drain pump 3 that operates in conjunction with the indoor unit body 1 pumps out the accumulated drain water 10 from the pump inlet 4, passes through the discharge port 5, the drain hose 7, the drain port 6, and the drain pipe 8 and drain port 9 of the drain pipe. Drain more to the outside.

[0005]

Since the conventional drain device is constructed as described above, when the drain pump 3 interlocking with the indoor unit body 1 is stopped, it is pumped up to the drain port 6 of the indoor unit body 1. Drain water 10
However, it falls in the drain hose 7 due to its own weight and flows back to return to the drain pan 2. Therefore, the drain pan 2 is filled with water, and in this state, the indoor unit body 1
If not operated, bacteria will be generated in the water, and these bacteria will become solid, and the inside of the drain pump 3 and the pump inlet 4
However, there is a problem in that it causes clogging and causes failure such as poor drainage.

Further, when the drain pump 3 is stopped, all the water in the drain hose 7 flows back to the drain pan 2, so that the space from the discharge port 5 of the drain pump 3 to the drain port 9 of the drain pipe 8 becomes a space. When the peculiar gas is present outside, the peculiar gas enters through the drain port 9 and also enters the interior of the indoor unit body 1 through the drain pipe 8 and the drain hose 7. As a result, the specific gas is hydrogen sulfide,
In the case of a corrosive gas such as ammonia, the corrosive gas acts on the refrigerant pipe 11 inside the indoor unit main body 1 to corrode the copper pipe to form a hole or a crack.
Moreover, there is a problem that the offensive odor gas that has entered the indoor unit body 1 is blown out into the room, which may cause an offensive odor in the room.

The present invention has been made to solve the above problems, and an object thereof is to obtain a drain device in which there is no back flow of water in the drain pan when operation is stopped and no peculiar gas from the outside enters. To do.

[0008]

A drain device according to a first aspect of the present invention is a drain device in which water collected in a drain pan is pumped out by a drain pump and drained through an upright drain pipe. A check valve is provided in the vicinity of the drain pipe.

A drain device according to a second aspect of the invention is
It uses a check valve that opens with discharge water pressure and closes with reverse flow water pressure.

A drain device according to a third aspect of the invention is
It has an on-off valve attached to the valve seat by a rotating shaft so as to be opened by the discharge water pressure discharged through the drain pipe, and a stopper that allows the on-off valve to be opened and closed within an acute angle so as to be closed by reverse flow water pressure. A check valve is used.

A drain device according to a fourth aspect of the invention is
A valve seat provided so as to vertically partition the inside of the drain pipe installed upright, and connected to this valve seat, pushed up by the discharge water pressure discharged through the drain pipe to open a hole opened in the center of the valve seat for operation. A check valve having a spherical valve that closes the hole by reverse flow water pressure when stopped is used.

The drain device according to the invention of claim 5 is
A solenoid valve that works in conjunction with the operation of the drain pump is used as a check valve.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

Embodiment 1 1 is a configuration diagram of a drain device showing a first embodiment of the present invention. The same parts as those in FIG. 6 are designated by the same reference numerals and their duplicate description will be omitted. In FIG. 1, 20 is a check valve made of plastic, for example,
In order to reduce the amount of backflow water between the discharge port 5 and the drainage port 6, it is provided in the middle of the drain hose 7 as close to the discharge port 5 as possible.

FIG. 2 is a perspective view showing an example of the check valve 20. In the middle of the drain hose 7, a cylindrical body is fitted with the upper end inside the drain hose 7 and the lower end outside the drain hose 7. 12, a seal portion 16 as a valve seat provided so as to vertically partition the inside of the cylindrical body 12, and the seal portion 1
An opening / closing valve 14 is provided on the upper surface of 6 so as to be opened and closed by water pressure around the rotary shaft 13, and a stopper 15 for making the fully opened position of the opening / closing valve 14 slightly lower than the vertical position (acute angle). It is configured.

Next, the operation will be described. When the drain pump 3 starts operating in conjunction with the indoor unit body 1,
The check valve 20 is discharged by the discharge water pressure pumped by the drain pump 3 and sent to the drain port 6 through the drain hose 7.
The on-off valve 14 is pushed open until it is regulated by the stopper 15, and the drain water 10 is drained through the drain hose 7 and the drain pipe 8.

On the other hand, when the drain pump 3 is stopped in conjunction with the indoor unit body 1, the drain water in the drain hose flows backward and the on-off valve 1 is opened obliquely due to the water pressure and its own weight.
4 is pushed down and brought into close contact with the seal portion 16 to be in a hermetically sealed state. As a result, the reverse flow of the drain water 10 of the drain hose 7 stops, and only a small amount of reverse flow flows into the drain pan 2. Therefore, water does not collect in the drain pan 2.

Further, the drain hose 7 above the check valve 20.
Since the drain water 10 stops inside, it is possible to reliably block the invasion of the peculiar gas from the drain port 9 by the water accumulated in the drain hose 7.

As described above, in the first embodiment, since the check valve 20 is provided in the vertical portion of the drain hose 7 close to the discharge port 5, when the drain pump 3 is operated, the check valve 20 is opened and closed. 14 is pushed open by the discharge water pressure, and the drain water can be reliably drained from the drain port 6.

When the drain pump 3 is stopped, the on-off valve 14 of the check valve 20 comes into close contact with the seal portion 16 to stop the drain water in the drain hose 7 between the on-off valve 14 and the drain port 6, so that the drain pan 3 It is possible to reliably prevent invasion of an offensive odor gas from the outside by the drain water that has accumulated.

Embodiment 2 FIG. FIG. 3 shows another example of the check valve 30. In the middle of the drain hose 7, a plastic cylindrical body 31 having an upper end fitted inside the drain hose 7 and a lower end fitted outside the drain hose 7 is shown. And this cylinder 3
1 is provided so as to partition the inside of the valve seat 1 into upper and lower parts, a valve seat 32 having a recessed center, a spherical valve 34 for opening and closing a central hole 33 of the valve seat 32, and a connector 3 for connecting the spherical valve 34 to the valve seat 32.
5 is comprised.

Next, the operation will be described. When the drain pump 3 is operated, the spherical valve 34 is lifted by the discharge water pressure, the central hole 33 of the valve seat 32 is opened, and the drain water is drained. Since the spherical valve 34 is connected to the valve seat 32 by the connecting member 35, it remains floating in water.

When the drain pump 3 is stopped, the drain water tries to reversely flow in the drain hose 7 by its own weight, but this backward flow water pressure causes the spherical valve 34 to engage with the hole 33 of the valve seat 32 and enter into the hole. Since they come into close contact with each other, the backflow is stopped, and the same effect as in the first embodiment can be obtained. Also, check valve 3
0 is easy to manufacture, and cost reduction can be achieved.

Embodiment 3. In FIG. 4, a solenoid valve 40 is provided at the discharge port of the drain pump 3 as a check valve, and the power source of the solenoid valve coil (not shown) is the same as the power source of the drain pump 3. With this configuration, when the drain pump 3 is operated, the solenoid valve 40 is fully energized by energizing the coil, and drain water pumped by the drain pump 3 is drained.
And drain through the drain pipe 8.

When the drain pump 3 is stopped, the solenoid valve 40
Since the coil is de-energized and fully closed, drain water does not flow backward at all, and the same effect as that of the first embodiment can be obtained. Further, since the solenoid valve is used as the check valve 40, its opening and closing is sure.

[0026]

As described above, according to the present invention, in the drain device for pumping the water accumulated in the drain pan with the drain pump and draining the water through the drain pipe installed upright, the drain pipe near the discharge port of the drain pump. Since the check valve is provided inside, it is possible to reliably prevent the drain water in the drain hose from flowing back to the drain pan under its own weight when the operation is stopped. As a result, there is no water retention in the drain pan and, if at all, it is extremely small, so that the inconvenience of bacteria generation does not occur. Further, the backflow prevention can completely block the invasion of the external peculiar gas by the water accumulated in the drain hole, so that it is possible to reliably prevent the inconvenience caused by the infiltration of the peculiar gas. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a drain device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a check valve.

FIG. 3 is a perspective view showing another check valve according to the second embodiment of the present invention.

FIG. 4 is a configuration diagram of a drain device according to a third embodiment of the present invention.

FIG. 5 is an overall configuration diagram of an indoor unit body with a built-in drain pump.

FIG. 6 is an enlarged view showing a portion of the drain pump.

[Explanation of symbols]

2 drain pans, 3 drain pumps, 5 discharge ports, 7
Drain hose (drain pipe), 13 rotating shaft, 14
Open / close valve, 15 stoppers, 16 seal parts (valve seats), 2
0,30 check valve, 32 valve seat, 33 hole, 34 spherical valve, 40 solenoid valve (check valve).

Claims (5)

[Claims] 1. A drain device in which water collected in a drain pan is pumped out by a drain pump and drained through a vertically installed drain pipe, wherein a check valve is provided in the drain pipe near a discharge port of the drain pump. Drain device. 2. The drain device according to claim 1, wherein the check valve is opened by discharge water pressure and closed by reverse flow water pressure. 3. The check valve is mounted on a valve seat by a rotating shaft so as to be opened by discharge water pressure discharged through a drain pipe, and the opening / closing is within an acute angle so that the check valve is closed by reverse flow water pressure. 3. The drain device according to claim 2, further comprising a stopper adapted to be carried out in 1. 4. The check valve is a valve seat provided so as to vertically partition the inside of a vertically arranged drain pipe, and the check valve is connected to the valve seat and is pushed up by discharge water pressure discharged through the drain pipe so as to be centered on the valve seat. 3. The drain device according to claim 2, further comprising a spherical valve that opens a hole formed in the hole and closes the hole by the reverse flow water pressure when the operation is stopped. 5. The drain device according to claim 1, wherein the check valve is a solenoid valve that operates in conjunction with the operation of the drain pump.