JP7323889B2 - Air conditioner and change method - Google Patents

Description

The present disclosure relates to an air conditioner and modification method.

2. Description of the Related Art Conventionally, an air-conditioning system having an air-conditioning device under the floor of a building is known (see, for example, Patent Literature 1).

Japanese Patent No. 5504015

Generally, in an air conditioner, when air is cooled by a heat exchanger, dew condensation occurs in the heat exchanger, and it is necessary to discharge this dew condensation to the outside of the building. Normally, as will be described later in a comparative example, a drain pipe 05 for discharging dew condensation to the outside is provided in the underfloor space 01, and a check valve 09 is provided in the middle of the drain pipe 05, so maintainability is poor.

The present disclosure has been made with a focus on the above problems, and aims to provide an air conditioner capable of ensuring maintainability while preventing dew condensation from an underfloor air conditioner from flowing back through a drainage path to the outside of the building, and a method for changing the air conditioner. With the goal.

The air conditioner of the present disclosure is provided under the floor of a building and includes a heat exchange unit equipped with a heat exchanger that cools indoor air, receives drain water from the heat exchanger of the heat exchange unit, and supplies it to the outside of the building. and a check valve provided in a portion of the drain passage outside the building to allow the drain water to flow from the heat exchanger side to the outside of the building and prohibit the flow in the opposite direction. And prepare.
The change method of the present disclosure includes a step of canceling the function of the check valve arranged under the floor in the drain passage, and installing a new check valve in the side wall external pipe provided to protrude from the building foundation side wall to the outside of the building. mounting and fixing the lateral pipe portion of the provided elbow pipe.

The air conditioner of the present disclosure can ensure maintainability while preventing dew condensation from the underfloor air conditioner from flowing back through the drainage path to the outside of the building.
In addition, the change method of the present disclosure can change an air conditioner with poor maintainability to an air conditioner with excellent maintainability.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall system diagram showing an overview of an air conditioning system including an air conditioner 50 according to Embodiment 1; FIG. 2 is a structural explanatory diagram showing the air conditioner 50 of Embodiment 1; FIG. 4 is a cross-sectional view showing an elbow pipe 63 used in the air conditioner of Embodiment 1; FIG. 3 is a structural explanatory diagram showing an air conditioner of a comparative example with the first embodiment; FIG. 3 is a cross-sectional view showing a check valve 09 of an air conditioner of a comparative example; 5 is a cross-sectional view showing a state in which the valve body 010 is removed from the check valve 09 in the method of changing the air conditioner of the comparative example to the air conditioner 50 of Embodiment 1. FIG. It is process explanatory drawing which shows the elbow pipe|tube 07 of the air conditioner of a comparative example, and its excision location. It is process explanatory drawing which shows the state which excised the elbow pipe|tube 07 of the air conditioner of a comparative example. FIG. 7 is a process explanatory diagram showing a state in which the elbow pipe 07 of the air conditioner of the comparative example is replaced with the elbow pipe 63 of the first embodiment;

Hereinafter, embodiments of the air conditioning system of the present disclosure will be described.
(Building configuration)
First, based on FIG. 1, the structure of the building H in which the air conditioning system of this embodiment is installed will be described.
The building H is provided with a building body 20 on a foundation 10. - 特許庁
The foundation 10 comprises a concrete foundation base 11 and foundation side walls 12 constructed as basic insulation.

The building body 20 is partitioned into an above-floor space 31 and an under-floor space 32 with a first-floor part 21 interposed therebetween. Further, the above-floor space 31 is partitioned into a first-floor space 31a and a second-floor space 31b with the ceiling/floor portion 22 interposed therebetween. A part of the above-floor space 31 is provided with an atrium space 31c where the first-floor space 31a and the second-floor space 31b are continuous.

A heat exchange ventilator 40 and an air conditioner 50 are provided in the underfloor space 32 .
The heat exchange ventilator 40 exchanges the inside air, which is the air inside the building, with the outside air, which is the air outside the building, and exchanges heat between the inside air and the outside air so that the heat of the inside air does not escape to the outside of the building. It is well known.

This heat exchange ventilator 40 is connected to an air supply port 41 and an air exhaust port 42 which are opened to the outside in the building H. As shown in FIG. Then, the heat exchange ventilator 40 heat-exchanges the outside air sucked from the air supply port 41 through the filter box 41a with the inside air in the heat exchange part 43, and then blows it out from the underfloor outlet 44 into the underfloor space 32. Through the floor supply air pipe 45, the air is blown out from the second floor outlet 46 to the second floor space 31b. The air blown out to the underfloor space 32 is blown out to the first floor space via the first floor air outlet 47 opened in the first floor section 21 .

On the other hand, the heat exchange ventilator sucks the air in the upper floor space 31 from the ventilation inlet 48 opened in the first floor floor 21, exchanges heat with the outside air in the heat exchange section 43, and then exhausts the air from the exhaust port 42 to the building. Exhaust to the outside.

Next, the air conditioner 50 will be described.
The air conditioner 50 has a heat exchange section 51 in the underfloor space 32 , sucks air from the above floor space 31 , exchanges heat in the heat exchange section 51 , and then blows air into the above floor space 31 and the underfloor space 32 . The heat exchange unit 51 includes a heat exchanger 51a (see FIG. 2) that heats and cools the blown air. The heat exchanger 51a shown in FIG. 2 is of a so-called heat pump type and performs both cooling and heating. As shown in FIG. 1, in the heat exchange section 51, the air in the above-floor space 31 is sucked from the heat exchange inlet 52 provided in the floor section 21 of the first floor, and after heat exchange is performed, this heat exchange is performed. The blown air is blown to the underfloor space 32, the first floor space 31a, and the second floor space 31b.

The airflow path from the heat exchange unit 51 to the floor space 31 is via the first airflow path 53, the path blowing from the first floor air outlet 53a of the first floor section 21, and the second airflow path 54. and a path for blowing into the underfloor space 32 from the underfloor space outlet 54a.

The air conditioner 50 is provided with a drain path 60 below the heat exchanger 51a for discharging condensation to the outside during cooling and dehumidification. The drain passage 60 includes a drain pan 61, a drain pipe 62, and an elbow pipe 63, as shown in FIG.

The drain pan 61 is arranged below the heat exchanger 51a in the case 51c of the heat exchange section 51, and is arranged to receive the condensed water falling from the heat exchanger 51a.

The drain pipe 62 communicates between the drain pan 61 and the outside of the building. A water gradient is provided so as to guide the dew condensation water of the base wall 12 to the outside.

The elbow pipe 63 has one end opening connected to the tip of the drain pipe 62 and the other opening directed downward. A check valve unit 70 is provided on the elbow pipe 63 . This check valve unit 70 has the function of a check valve that allows drain water to be discharged from indoors to the outdoors, and blocks backflow of drain water and entry of insects and odors from the outside of the building into the building. and is detachably attached to the elbow pipe 63 .

The drain pan 61 is provided with a water level sensor 80 that detects when the water level of the drain water accumulated in the drain pan 61 exceeds a preset allowable water level. A controller (not shown) of the air conditioner 50 stops the operation of the air conditioner 50 when the water level of the drain pan 61 exceeds the allowable water level and there is a risk of water leakage.

Next, the elbow pipe 63 and the check valve unit 70 will be described with reference to FIG.
FIG. 3 is a vertical cross-sectional view of the elbow pipe 63 and the check valve unit 70. The elbow pipe 63 has a horizontal pipe portion 631 with its axis oriented horizontally and a vertical pipe portion with its axis oriented vertically. 632 are integrally formed via a curved portion 633 .

At the tip of the horizontal pipe portion 631, a cylindrical joint portion 634 having a large diameter for connection and having an abutting step portion is formed, and the drain pipe 62 is connected to this joint portion 634. be done.

Further, the vertical pipe portion 632 of the elbow pipe 63 has an inspection opening 635 on the side opposite to the building H, and a locking hole 632 a is opened at a position facing the inspection opening 635 . A unit support portion 636 for supporting the check valve unit 70 is provided in the inspection port 635 .
The unit support portion 636 includes a large-diameter and small-diameter two-stage cylindrical portion 636a into which a lid portion 73 and an attachment/detachment operation portion 74, which will be described later, of the check valve unit 70 are fitted. and a bottom portion 636 b that closes the portion other than 635 . Further, the cylindrical portion 636a is provided with a tapered portion 636c having a shape that gradually narrows the inner diameter between the large diameter portion and the small diameter portion.

A lock groove 636d is formed on the inner circumference of the large-diameter portion of the cylindrical portion 636a. Although detailed illustration is omitted, this lock groove 636d is a portion that forms a locked state as shown in FIG. The lock groove 636d has a portion that extends axially to the opening after being displaced toward the opening end side of the cylindrical portion 636a as it is circumferentially displaced from the position shown in FIG.

Next, the check valve unit 70 will be described.
The check valve unit 70 includes a valve body 71 , a flow path forming portion 72 , a lid portion 73 and an attachment/detachment operation portion 74 .

The valve body 71 is made of an elastic material. The elastic body is made of synthetic resin (for example, silicone), rubber, or the like.

The flow path forming portion 72 forms a flow path that is continuous with the flow path of the vertical pipe portion 632 of the elbow pipe 63, and has the function of a valve seat and the function of holding the valve body 71. The formation portion 72 includes a tubular portion 721 , a valve seat portion 722 and a valve body holding portion 723 .

The tubular portion 721 is formed in a tubular shape and arranged substantially coaxially with the vertical tubular portion 632 . A packing member 724 is provided at the upper end of the tubular portion 721 to abut against the vertical tubular portion 632 and seal therebetween. Further, on the outer side of the tubular portion 721, an engaging projection 725 is provided that is inserted into the engaging hole 632a of the vertical tubular portion 632 and engages in the vertical direction.
The valve seat portion 722 is formed at the lower end of the tubular portion 721 and forms a valve closed state in which the valve element 71 abuts and an open valve state in which the valve element 71 is separated.
The valve body holding portion 723 holds the central portion of the valve body 71 . The holding state of the valve body 71 will be described later.
The lid portion 73 closes the inspection opening 635, is formed integrally with the flow path forming portion 72, and is formed by a cylindrical portion 731 that abuts on the inner periphery of the small diameter portion of the cylindrical portion 636a of the unit support portion 636, and the cylindrical portion 731. and a bottom portion 732 provided inside. An O-ring 733 is provided on the outer periphery of the cylindrical portion 731 to press against and seal the inner periphery of the small-diameter portion of the cylindrical portion 636a.

The attachment/detachment operation part 74 performs an operation when attaching/detaching the check valve unit 70 to/from the vertical pipe part 632, and is connected to the lid part 73 so as to be relatively rotatable. It is removable. That is, by attaching and detaching the attachment/detachment operation portion 74 to and from the cylindrical portion 636a, the lid portion 73 and the flow path forming portion 72 can be pulled out from the elbow pipe 63 together with the attachment/detachment operation portion 74. , inspection opening 635.

The attachment/detachment operation section 74 will be described in detail below.
The attachment/detachment operation part 74 has a cylindrical part 741 that can rotate relative to the inner circumference of the cylindrical part 636a. A knob portion 743 is protruded. In other words, the attachment/detachment operation portion 74 can be rotated clockwise and counterclockwise by picking up the knob portion 743 .

Further, on the inner peripheral side of the disk portion 742 of the attaching/detaching operation portion 74, an inner peripheral cylindrical portion 742a with a bottom is provided that loosely fits in the inner peripheral portion of the cylindrical portion 731 of the lid portion 73. As shown in FIG. Engagement projections 731a projecting in the inner diameter direction from the inner circumference of the cylindrical portion 731 are arranged in the engagement grooves 742b provided along the entire circumference of the outer circumference of the inner circumference cylindrical portion 742a. Displaceable and axially engaged.

Therefore, when the attachment/detachment operation portion 74 is rotated, the lid portion 73 and the flow path forming portion 72 can move in the axial direction (horizontal direction in FIG. 3) without rotating.

Between the attachment/detachment operation portion 74 and the unit support portion 636 of the elbow pipe 63, the check valve unit 70 is in a locked state fixed to the vertical pipe portion 632 of the elbow pipe 63, and in a state in which the check valve unit 70 can be inserted into and removed from the vertical pipe portion 632. A lock mechanism 75 is provided for switching between the unlocked state and the unlocked state. In the locked state of the check valve unit 70, the cylindrical portion 731 of the lid portion 73 is guided by the tapered portion 636c and abuts against the bottom portion 636b. At the same time, the packing member 724 of the tubular portion 721 is brought into pressure contact with the vertical tube portion 632 to be in a sealed state, and the O-ring 733 of the cylindrical portion 731 is brought into pressure contact with the cylindrical portion 636a to be in a sealed state.

The locking mechanism 75 is formed by a locking projection 741a protruding radially from the cylindrical portion 741 and the locking groove 636d of the cylindrical portion 636a. That is, when the locking projection 741a is axially pushed into the locking groove 636d from the opening side of the cylindrical portion 636a and the attachment/detachment operation portion 74 is rotated, the locking projection 741a rotates along the locking groove 636d. Axial displacement. Ultimately, the attachment/detachment operation portion 74 hits the stepped portion due to the diameter difference of the cylindrical portion 636a of the unit support portion 636 shown in FIG. At this time, the lid portion 73 also contacts the bottom portion 636b of the unit support portion 636, and the O-ring 733 is pressed against the cylindrical portion 636a to form a sealed state. Further, the flow path forming portion 72 is restricted from moving vertically by inserting the locking protrusion 725 into the locking hole 632a of the vertical pipe portion 632, and the packing member 724 at the upper end of the flow channel forming portion 72 is inserted into the vertical pipe portion 632. A sealed state is formed by pressure contact.

Next, the valve body holding portion 723 of the flow path forming portion 72 will be described.
The valve body holding portion 723 holds the valve body 71 in a state in which the valve body 71 is pressed against the valve seat portion 722 . As described above, the valve body 71 is made of an elastic material and has a disk-like shape, and the central portion thereof is formed in an upwardly convex shape. The valve body holding portion 723 holds the convex portion of the central portion of the valve body 71 at a position above the outer peripheral portion in contact with the valve seat portion 722 , thereby elastically deforming the valve body 71 and moving the valve seat. The valve is held in a closed state in which it is pressed against the portion 722 .

Further, the valve closing force with which the valve body 71 is pressed against the valve seat portion 722 is a preset valve closing force. It is set to open when water is collected. That is, the valve body 71 opens to drain the drain water flowing above the valve body 71 when it reaches a predetermined water head (predetermined height and weight). The elastic restoring force presses against the valve seat portion 722 and returns to the closed state.

(Action of Embodiment 1)
The operation of the first embodiment will be described below. Before explaining this action, first, the problem of the comparative example will be explained.

(Comparative example)
FIG. 4 shows an air conditioner of a comparative example, in which a heat exchange section 02 of the air conditioner is provided in an underfloor space 01 . The heat exchange section 02 includes a heat exchanger 03, and a drain pan 04 is provided below the heat exchanger 03. 06 can be discharged to the outside of the building. At the tip of the drain pipe 05, an elbow pipe 07 is provided as a side wall external pipe protruding from the base side wall 06 to the outside of the building so that the drain water can be discharged downward.

Further, the drain pan 04 is provided with a water level sensor 08 that detects when the water accumulated in the drain pan 04 exceeds a predetermined allowable amount of water. , the air conditioner stops operating.

A check valve 09 is provided in the middle of the drain pipe 05 to prevent backflow of drain water and entry of insects and odors into the building from the outside. A valve element 010 is provided in the check valve 09 .

The above comparative example has the following problems.
Drain water contains indoor air dust and dirt adhering to the heat exchanger 03 . As a result, microorganisms are generated in the drain water, resulting in so-called "slime". Due to this "sliminess", the valve body 010 of the check valve 09 cannot be smoothly opened, and drainage may not be smoothly performed. In particular, when the check valve 09 is provided in the middle of the drain pipe 05, the valve body 010 is structured to be opened by water pressure based on the drain gradient of the drain pipe 05. Even a slight resistance may cause valve opening failure.

When the water is not drained smoothly, the water level in the drain pan 04 increases, and when the allowable amount of water is exceeded, the water level sensor 08 detects it and the air conditioner stops operating.

In the event of such a problem, a person must dive into the underfloor space 01 to inspect the situation, and after ascertaining the situation, wash the check valve 09 and then drain the drain pan 04. Such work is difficult for the residents to do, and the work is done by calling a contractor. Therefore, it takes a long time to restart the operation after the operation of the air conditioner is stopped, and the problem of being unable to use the air conditioner continues for a long time, requiring labor and cost.

(For the air conditioner of Embodiment 1)
Next, the case of the air conditioner 50 of Embodiment 1 will be described.
The drain water accumulated in the drain pan 61 flows from the drain pan 61 toward the elbow pipe 63 based on the water gradient of the drain pipe 62. - 特許庁In the elbow pipe 63 , the drain water drops from the horizontal pipe portion 631 to the vertical pipe portion 632 and accumulates on the valve body 71 of the check valve unit 70 .

When the level (weight) of the drain water accumulated on the valve body 71 exceeds the valve closing force due to the elasticity of the valve body 71, the valve body 71 is deformed downward as indicated by the chain double-dashed line in FIG. to open the valve and drain the drain water downward. After the water is drained, the restoring force of the valve body 71 returns to the closed state.

As described above, in the check valve unit 70, since the valve body 71 is structured to open by the head pressure (weight), even if "sliminess" occurs in the drain water, the valve opening is less likely to fail. In particular, as shown in the comparative example, compared with the valve that is opened by the water pressure due to the water gradient, the valve opening failure is less likely to occur.

In addition, since the valve body 71 abuts against the valve seat portion 722 from below, when wind pressure acts on the valve body 71 in a direction that causes the drain passage 60 to flow backward, the valve body 71 will move toward the valve seat portion 722 . It is pressed against the air and prevents insects, dust, dirt, etc. from entering with the wind. When a negative wind pressure acts on the valve body 71, it acts in the direction of the flow in the drain passage 60, and only the head pressure for opening the valve body 71 becomes low. is only drained, and insects, dirt and dust cannot enter.

Next, a case where the check valve unit 70 fails to open due to "sliminess" or the like will be described.
When the check valve unit 70 fails to open, drain water may accumulate in the drain passage 60 and the water level of the drain pan 61 may exceed the allowable water level, as in the comparative example. In this case, as in the comparative example, when the water level sensor 80 detects that the water level exceeds the allowable level, the operation of the air conditioner 50 is stopped.

In such a case, the resident can perform maintenance work on the check valve unit 70 from outside the building.
In this maintenance work, first, the check valve unit 70 shown in FIG. 3 is removed from the elbow pipe 63 . When the check valve unit 70 is to be removed, the lock mechanism 75 is unlocked by pinching the knob 743 and rotating the attachment/detachment operation portion 74 . When the attachment/detachment operation portion 74 is pulled forward in this unlocked state, the entire check valve unit 70 can be pulled out from the elbow pipe 63 .

Therefore, the valve body 71 and the valve seat portion 722 of the check valve unit 70 are exposed, and the cause of the valve opening failure of the valve body 71 such as "sliminess" is removed, and the valve can be smoothly opened. can be done.

Further, when the check valve unit 70 is pulled out from the elbow pipe 63, the drain water accumulated in the drain passage 60 and the drain water accumulated in the drain pan 61 are drained. As a result, the water level in the drain pan 61 drops, the water level detected by the water level sensor 80 drops below the allowable water level, and the air conditioner can resume operation.

Furthermore, the resident can prevent the check valve unit 70 from opening failure due to "sliminess" by performing the above maintenance work periodically (for example, about once a year). Since the check valve unit 70 can be attached to and detached from the elbow pipe 63 outside the building, such regular maintenance work can be easily performed.

(How to change the air conditioner)
Next, a method for changing the air conditioner of the comparative example shown in FIG. 4 to the air conditioner 50 of the first embodiment will be described.

First, the valve body 010 is removed from the check valve 09 of the drain pipe 05 to cancel the function of the check valve 09 . In this case, the valve body 010 may be completely removed, or only the portion of the valve body 010 that functions as a valve may be cut.

Next, the elbow pipe 07 is cut along the base side wall 06 at the position of the dotted line cut in FIG. Then, as shown in FIG. 6B, the joint pipe 011 is inserted and fixed to the inner circumference of the drain pipe 05 remaining in the base side wall 06 .

Next, as shown in FIG. 6C, the lateral pipe portion 631 of the elbow pipe 63 shown in the first embodiment is attached and fixed to the outer circumference of the joint pipe 011 . For this fixation, an adhesive or welding can be used.

As described above, by removing the check valve function of the existing check valve 09 and replacing the existing elbow pipe 07 with the elbow pipe 63 used in the first embodiment, the air conditioner of the first embodiment can be obtained. can do.

(Effect of Embodiment)
The effects of the air conditioning system of Embodiment 1 are enumerated below.
(1) The air conditioner 50 of Embodiment 1 is provided in the underfloor space 32 of the building H, and includes a heat exchange section 51 including a heat exchanger 51a for cooling indoor air, and drain water from the heat exchanger 51a. is provided in a drain path 60 that receives and leads to the outside of the building, and a portion (elbow pipe 63) of the drain path 60 outside the building, allowing drain water to flow from the heat exchanger 51a side toward the outside of the building, and a check valve (valve element 71) that prohibits flow in the opposite direction.
Therefore, even if the check valve malfunctions, it can be confirmed outside the building without going into the underfloor space 32, which is excellent in maintainability.

(2) In the air conditioner 50 of Embodiment 1, an elbow pipe 63 is provided outside the building of the drain passage 60 to direct the direction of the drain passage 60 downward. 63 provided in the vertical pipe portion 632 and receives the head pressure of the drain water accumulated on the check valve (valve body 71), the head pressure is less than the predetermined pressure and the valve is kept closed, and the predetermined pressure is exceeded, the valve opens.
Therefore, compared with the comparative example in which the check valve 09 is provided in the middle of the drain pipe 05, which is opened by the water pressure due to the water gradient, the valve opening failure due to "sliminess" is less likely to occur.

(3) In the air conditioner 50 of Embodiment 1, the check valve (valve element 71) is provided as a check valve unit 70 that can be attached to and detached from the vertical pipe portion 632, and the check valve unit 70 is provided in the vertical pipe portion 632, a tubular portion 721 forming a flow path continuing to the vertical tubular portion 632, a valve seat portion 722 provided downward at the lower end of the tubular portion 721, and and a valve body 71 provided in pressure contact with the valve seat portion 722 from below the valve seat portion 722 .
Therefore, when an abnormality occurs in the opening and closing of the valve body 71, the check valve unit 70 can be removed from the elbow pipe 63 for maintenance.

(4) In the air conditioner 50 of Embodiment 1, the lock mechanism 75 is provided between the check valve unit 70 and the vertical pipe portion 632 to lock the check valve unit 70 to the vertical pipe portion 632. It is
Therefore, the detachable check valve unit 70 can be fixed to the elbow pipe 63, and compared with the one without the lock mechanism 75, it is possible to prevent the check valve unit 70 from being displaced due to vibration or the like.

(5) The modification method of Embodiment 1 is provided in the underfloor space 01 of the building, and receives the drain water of the heat exchanger 02 provided in the underfloor space 01 of the building and equipped with the heat exchanger 03 that cools the indoor air flow, A drain pipe 05 leading from the heat exchange unit 02 to the outside of the building, a check valve 09 arranged in the underfloor space 01 in the drain pipe 05, and a check valve 09 provided at the end of the drain pipe 05 outside the building. This is a method of changing from an air conditioner including an elbow pipe 07 protruding from a side wall 06 to the outside of a building and curved downward to the air conditioner 50 of the first embodiment.
Then, a step of canceling the function of the check valve 09, a step of cutting off the existing elbow pipe 07 leaving at least a portion fixed to the base side wall 06, and a step of cutting the existing elbow pipe 07 into the base side wall 06 A step of inserting and fixing the joint pipe 011 into the remaining pipe portion and a step of mounting and fixing the horizontal pipe portion 631 of the elbow pipe 63 to the outer circumference of the joint pipe 011 are provided.
Therefore, it is easy to change the existing air conditioner to the air conditioner 50 of Embodiment 1 having the above effects.

(6) The elbow pipe 63 of Embodiment 1 is an elbow pipe in which a horizontal pipe portion 631 as a first pipe portion and a vertical pipe portion 632 as a second pipe portion, which are substantially perpendicular to each other, are connected by a curved portion 633. 63. The elbow pipe 63 is provided with a check valve (valve body 71) in the vertical pipe portion 632 that allows the fluid to flow from the horizontal pipe portion 631 to the vertical pipe portion 632 and blocks the flow in the opposite direction. , the check valve (valve element 71 ) is supported by a check valve unit 70 that can be attached to and detached from the vertical pipe portion 632 .
Therefore, it is easy to provide the air conditioner 50 of Embodiment 1, and it is also easy to change an existing air conditioner to the air conditioner 50 .

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and design changes to the extent that they do not deviate from the gist of the present invention are included in the present invention. is.
In the embodiment, an example in which the air conditioner 50 is applied to a two-story building H is shown, but the building to which the air conditioner 50 is applied is not limited to this, and can be a one-story building or a three-story building or more. can be applied to buildings with a number of storeys.

Also, in the embodiment, the check valve unit 70 is detachable from the elbow pipe 63, but the present invention is not limited to this. For example, the check valve (valve element 71 ) may be configured to be fixed to the vertical pipe portion 632 of the elbow pipe 63 . Also in this case, when the check valve is in an open failure state, the inspection can be performed outside the building without going into the underfloor space 32, thereby improving maintainability. Furthermore, in this case, as shown in the embodiment, the valve is not limited to the one that is opened by the hydraulic head pressure. For example, the check valve 09 shown as a comparative example may be provided outside the building.

Further, even if the check valve is provided in the vertical pipe portion 632 of the elbow pipe 63 and has a structure in which the valve is opened by the hydraulic head pressure, the check valve unit 70 is not limited to a detachable one. Even if it is fixed to the vertical pipe portion 632, it is possible to obtain an effect of being excellent in maintainability and an effect of being less susceptible to "sliminess".

Also, the detachable structure and locking structure of the check valve unit 70 are not limited to those shown in the embodiment. For example, in the embodiment, locking and unlocking are switched by rotating the attachment/detachment operation part 74, but the check valve unit can be simply moved in and out in the horizontal direction in FIG. 3 and locked when it is inserted. It is also possible to provide a structure that does not involve a rotating operation, for example, by providing a structure to the vertical tube portion 632 .

Furthermore, although the air conditioner before being changed to the air conditioner of the embodiment has the elbow pipe 07 as the side wall external pipe communicating from the base side wall 06 to the outside, the outside of the side wall of the air conditioner before the change is shown. The pipe is not limited to the elbow pipe 07. For example, it may be a straight tube protruding horizontally. In this case, the elbow pipe 63 may be directly attached to the side wall external pipe without going through the step of cutting the straight side wall external pipe or the step of inserting and fixing the joint pipe 011, or as in the first embodiment. Alternatively, a portion of the side wall external pipe may be cut off, or the joint pipe 011 may be inserted into the side pipe and fixed, and the elbow pipe 63 may be attached to the joint pipe 011 .

Further, regardless of whether the side wall external pipe is an elbow pipe 07 or a straight pipe, in the step of cutting away the portion of the side wall external pipe that is fixed to the base side wall 06, as shown in the first embodiment, , only the portion fixed to the base side wall 06 is left. For example, a portion protruding from the base side wall 06 may be left, and the elbow pipe 63 may be attached directly to this portion or via the joint pipe 011 .

12 Foundation side wall 31 Above-floor space 32 Under-floor space 50 Air conditioner 51 Heat exchange part 51a Heat exchanger 60 Drain path 61 Drain plate 62 Drain pipe 63 Elbow pipe 70 Check valve unit 71 Valve body 72 Flow path forming part 73 Lid part 74 Removable Operation portion 75 Lock mechanism 80 Water level sensor 631 Horizontal pipe portion 632 Vertical pipe portion 633 Bending portion 722 Valve seat portion 723 Valve body holding portion H Building

Claims (2)

a heat exchange section provided under the floor of the building and provided with a heat exchanger for cooling indoor air;
a drain path that receives drain water from the heat exchanger and guides it to the outside of the building;
a check valve provided in a portion of the drain passage outside the building to allow the drain water to flow from the heat exchanger side to the outside of the building and prohibit flow in the opposite direction;
with
Outside the building of the drain passage, an elbow pipe is provided in which a horizontal pipe portion with its axis directed horizontally and a vertical pipe portion with its axis directed vertically are integrally formed via a curved portion. ,
The check valve is provided in the vertical pipe portion and receives a hydraulic head pressure of the drain water accumulated above the check valve, and maintains a closed state when the hydraulic head pressure is less than a predetermined pressure. When the specified pressure is exceeded, the valve opens,
The check valve is provided as a detachable check valve unit so as to block an inspection opening formed on the side of the vertical pipe portion,
The check valve unit is
a tubular portion that forms a flow path that is continuous with the vertical tubular portion in the middle of the vertical tubular portion;
a valve seat portion facing downward at the lower end portion of the tubular portion;
a valve body provided on the lower side of the tubular portion and provided in pressure contact with the valve seat portion from below the valve seat portion;
with
An air conditioner, wherein a lock mechanism is provided between the check valve unit and the vertical pipe portion to lock the check valve unit to the vertical pipe portion. a heat exchange section provided under the floor of the building and provided with a heat exchanger for cooling indoor air;
a drain path that receives drain water from the heat exchanger and guides it from the heat exchange unit to the outside of the building;
a check valve arranged under the floor in the drain passage;
a side wall external pipe protruding from the base side wall of the building to the outside of the building at the end of the drain passage outside the building;
A method for changing from an air conditioner comprising a to the air conditioner according to claim 1 ,
a step of deactivating the check valve;
a horizontal pipe portion and a vertical pipe portion in which the direction of the drain passage is oriented downward from the horizontal direction ; a step of attaching and fixing the lateral pipe portion of the elbow pipe to the side wall external pipe, the lateral pipe portion of the elbow pipe having a new check valve that maintains a closed state when the pressure is full and opens when the predetermined pressure is exceeded;
A modification method comprising: