JP3393772B2 - Air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an HCFC (hydrochlorofluorocarbon) type refrigerant (hereinafter, represented by R
22) is used as a substitute refrigerant, and a high-pressure refrigerant having a saturation pressure higher than that of R22 is used.

[0002]

2. Description of the Related Art In a commonly used split type air conditioner, an outdoor unit is installed outdoors, an indoor unit is separated from the outdoor unit and installed at an appropriate indoor location such as a wall or ceiling. The pipe connection portion of the outdoor unit and the pipe connection portion of the indoor unit are connected by a refrigerant pipe.

As the pipe connecting portion, for example, a packed valve in which a refrigerant is enclosed is used. This packed valve has a slide valve body, a refrigerant pipe connecting portion composed of a screw portion, a flare nut and the like, and a refrigerant. Controlling the flow / shutoff of the refrigerant through the packed valve by rotating the insertion hole for rotation such as a hexagonal wrench hole provided in the slide valve body with the supplementary charge port and sliding the slide valve body. It is possible to do.

By the way, in the conventional split type air conditioner, R22 is uniformly used as a refrigerant, and the structure of the above-mentioned pipe connecting portion (packed valve) (tube diameter of charge port, insertion hole for rotation). The dimensions of the slide valve body such as the hole diameter and the screw portion configuration including the screw pitch, the screw diameter, and the screw shape were all designed for R22 (for example, the screw shape of the screw portion is Recessed screw (male screw) was determined).

[0005]

Since R22 described above may destroy the ozone layer, it has been officially decided that its use will be abolished in the future, and an air conditioner using a refrigerant instead of R22 will be used. Research and development are underway.

As an alternative refrigerant to R22,
Alternative refrigerant having a higher saturation pressure (condensation pressure) at the same temperature than R22 (for example, the saturation pressure at 50 ° C. is 250).
It is a refrigerant of 0 kPa or more, R32 (difluoromethane; CH ₂ F ₂ ) and R125 (pentafluoroethane;
CHF ₂ CF ₃ ) and HFCs refrigerant such as R410A produced by mixing 50 wt% of each of CHF ₂ CF ₃ ).

However, when the above alternative refrigerant is adopted in a split type air conditioner, the alternative refrigerant is R
Since the pressure is higher than that of 22, the refrigerant may leak from the refrigerant pipe connecting portion and the charge port designed for R22, and there is a need to prevent the refrigerant leakage.

Further, when the slide valve body of the packed valve is opened when the air conditioner is used, a larger force is required than when R22 is used because the enclosed alternative refrigerant has a higher pressure than R22. When closing the slide valve body of the packed valve at the time of producing the air conditioner or relocating the air conditioner, it is necessary to further tighten the tightening and completely shut off the refrigerant as compared with the case of using R22. This imposes an extra burden on the air conditioner installer and service workers, increasing the installation and service work time.

The present invention has been made in view of the above-mentioned circumstances. Even when an alternative refrigerant (high pressure refrigerant) having a higher saturated pressure at the same temperature as R22 is used, the refrigerant pipe connecting portion and the charge port can be used. It is an object of the present invention to provide an air conditioner capable of preventing the refrigerant leakage of the above and enabling the slide operation of the slide valve to be easily performed.

Further, according to the present invention, the air conditioner having the pipe connecting portion uses the alternative refrigerant (HFC type refrigerant) by means for preventing the above-mentioned refrigerant leak in the pipe connecting portion or for easily performing the sliding operation. It is possible to identify an air conditioner, and mistakenly connect an indoor unit that uses R22 to an outdoor unit that uses an alternative refrigerant or R22.
Another object is to eliminate the risk of replenishing the air conditioner and further improve the reliability of the air conditioner.

[0011]

According to a first aspect of the present invention, in an air conditioner using a high pressure refrigerant having a saturation pressure higher than that of an HCFC type refrigerant as a circulating refrigerant in a refrigeration cycle, the high pressure refrigerant is used in the refrigeration cycle. A charging port for replenishing the charging port and a nut for closing the charging port, and at least a part of the nut is provided with a tightening strengthening means for strengthening the tightening of the nut.

In the second aspect of the invention, the outdoor unit and the indoor unit, which are separate units, are connected by a refrigerant pipe, and the refrigerant is circulated through the refrigerant pipe to the outdoor unit and the indoor unit to form a refrigeration cycle. An air conditioner using a high-pressure refrigerant having the same temperature and a higher saturation pressure than that of an HCFC refrigerant as the circulating refrigerant, wherein the outdoor unit and the indoor unit are connected to the refrigerant pipe. A nut for tightening and fixing a portion is provided, and at least a part of the nut is provided with tightening strengthening means for strengthening the tightening of the nut.

According to a third aspect of the present invention, in the first and second aspects, there is provided a tightening strengthening means including a plurality of grooves formed on the tightening surface of the nut.

In a fourth aspect of the present invention, in the first and second aspects, a tightening strengthening means is provided in which the outer diameter of the nut is larger than the outer diameter of the nut used in the air conditioner using an HCFC refrigerant.

The fifth aspect of the invention also has an identification function for identifying the use of the high pressure refrigerant in the first and second aspects.

According to the first to fifth aspects, the nut for closing the charge port for replenishing the high-pressure refrigerant and the connecting portion between the outdoor unit and the indoor unit in the split type air conditioner and the refrigerant pipe are tightened. For the nut to be fixed,
Since a means for strengthening the tightening of the nut (for example, a plurality of grooves formed on the tightening action surface of the nut) is provided,
When tightening the nut with the wrench, the wrench easily catches on the tightening action surface of the nut due to the plurality of grooves described above, and the nut can be securely and firmly tightened.

Further, since a plurality of grooves are formed on the tightening action surface of the nut as the tightening strengthening means, the installer and the service worker have the grooves indicating that the air conditioner uses the high pressure refrigerant. Therefore, it can be easily identified.

According to the air conditioner of the sixth aspect of the present invention, the outdoor unit and the indoor unit, which are separate units, are connected by a refrigerant pipe, and the refrigerant is connected to the outdoor unit and the indoor unit through the refrigerant pipe. An air conditioner configured to circulate a refrigeration cycle by circulating a refrigerant, wherein the circulating refrigerant is a high-pressure refrigerant having a higher saturation pressure at the same temperature than that of an HCFC refrigerant, and the refrigerant pipe is connected to the refrigerant pipe. An opening / closing valve having a slide valve body capable of interrupting the flow of the high-pressure refrigerant at the connection portion is provided at the connection portion of the outdoor unit, and the inner diameter of the rotary slide insertion hole of the slide valve body is set to the outer radius of the slide valve body. Bigger than that.

According to the present invention, the inner diameter of the rotary slide insertion hole of the slide valve body of the opening / closing valve for controlling the refrigerant flow provided in the connecting portion of the outdoor unit connected to the refrigerant pipe in the split type air conditioner. Is larger than the outer circumference radius of the slide valve body, the rotation operation of the rotary slide insertion hole is smooth, and the slide valve body can be easily slid even when high-pressure refrigerant is enclosed.

According to the air conditioner of the seventh aspect of the invention, the outdoor unit and the indoor unit, which are composed of separate units, are connected by a refrigerant pipe, and the refrigerant is connected to the outdoor unit and the indoor unit through the refrigerant pipe. An air conditioner configured to circulate a refrigeration cycle by circulating a refrigerant, wherein the circulating refrigerant is a high-pressure refrigerant having a higher saturation pressure at the same temperature than that of an HCFC refrigerant, and the refrigerant pipe is connected to the refrigerant pipe. An opening / closing valve having a slide valve body capable of interrupting the flow of the high-pressure refrigerant in the connection portion is provided at a connection portion of the outdoor unit, and an inner diameter of a rotary slide insertion hole of the slide valve body is set to the air conditioner using the HCFC refrigerant. It is larger than the inner diameter of the rotary slide insertion hole of the slide valve body of the on-off valve used uniformly in the machine.

According to the seventh aspect of the invention, the insertion hole for the rotary slide of the slide valve body of the opening / closing valve for controlling the refrigerant flow provided in the connecting portion of the outdoor unit connected to the refrigerant pipe in the split type air conditioner. The inner diameter of the rotary slide is larger than the inner diameter of the rotary slide insertion hole of the slide valve body of the on-off valve that is uniformly used in the HCFC refrigerant air conditioner.
It becomes smoother (or to the same extent) as the rotating operation of the rotary slide insertion hole in a device using a similar refrigerant, and the slide valve body can be easily slid even when high-pressure refrigerant is enclosed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the air conditioner of each of the embodiments described below uses an HCFC type refrigerant (R
22) An alternative refrigerant having a higher saturation pressure at the same temperature than that of 22) (for example, a refrigerant having a saturation pressure of 2500 kPa or more at 50 ° C., R32 (difluoromethane; CH ₂ F ₂ ) and R125 (pentafluoroethane; CHF ₂ CF ₃₎ ) And a HFC type refrigerant such as R410A produced by mixing

(First Embodiment) FIG. 1 is a view showing the arrangement of an air conditioner according to this embodiment. According to FIG.
The air conditioner 1 has an outdoor unit 2 having a compressor, a four-way valve, an outdoor heat exchanger, and an expansion valve, and an indoor unit 3 having an indoor heat exchanger. It is configured as a split type device that is installed outdoors and the indoor unit 3 is separated from the outdoor unit 2 and installed at an appropriate indoor location such as a wall or ceiling. And split type air conditioner 1
In the above, the outdoor unit 2 in which the HFC refrigerant is enclosed and the indoor unit 3 in which the HFC refrigerant is enclosed are connected by refrigerant pipes 4A and 4B to form a refrigeration cycle.

FIG. 2 is an enlarged view of a portion surrounded by a broken line A in FIG. 1, that is, a connecting portion between the outdoor unit 2 and the refrigerant pipes 4A and 4B. According to FIG. 2, the refrigerant pipes 4A, 4
B is a pipe connecting portion 5 provided at the pipe end on the outdoor unit 2 side.
It is connected to A and 5B.

The pipe connecting portions 5A and 5B are packed valves filled with high-pressure refrigerant as shown in FIG. 2. The packed valves 5A and 5B include a slide valve body (not shown) and the slide valve. A wrench hole cover screw 6 for covering a rotation insertion hole such as a hexagon wrench hole of the body, and a refrigerant pipe connection portion 7 having a nut (hexagon nut) 7a provided on the trumpet-shaped pipe end 2a on the outdoor unit 2 side. , And a connection port (charge port) 8 for replenishing the refrigerant.

FIG. 3 shows the outdoor unit side end of the refrigerant pipe 4A surrounded by a broken line C (broken line C'in the case of the pipe connecting portion 5B) in FIG. 2 and the refrigerant pipe connecting portion 7 of the pipe connecting portion 5A. It is a figure which expands and shows.

As shown in FIG. 3, the nut 7a formed by the spanner is provided on the side surface of the nut 7a which is brought into contact with the spanner and is subjected to the tightening action (hereinafter referred to as the tightening action surface).
In order to strengthen the tightening, the plurality of grooves 10 having, for example, uneven undulations are formed.

The size (outer diameter) of the nut 7a is R
The thread pitch of the threaded portion 11 formed on the inner peripheral surface of the nut 7a is larger than the size (outer diameter) of the nut of the pipe connection portion for R22. It is formed to have a different pitch.

A screw portion 12a is provided on the outer surface of the outdoor unit side end portion 12 of the refrigerant pipe 4A, and a tapered portion 12b formed into a tapered shape is provided at the tip end portion thereof, and is constructed as a male screw as a whole. ing. And the pipe connecting portion 5A
Pipe connection end 2a of the refrigerant pipe 4A and the taper portion 12b at the tip of the outdoor unit side end 12 of the refrigerant pipe 4A are joined and the screw portion 12a is screwed with the nut 7a, whereby the refrigerant pipe 4A and the outdoor unit 2 are connected.
And are connected. The pipe connecting portion 5B is also the pipe connecting portion 5
The configuration is substantially the same as A, and the description thereof is omitted.

On the other hand, FIG. 4 is an enlarged view showing a portion surrounded by a broken line B in FIG. 1, that is, a connecting portion between the indoor unit 3 and the refrigerant pipe 4A.

According to FIG. 4, a nut (hexagonal nut) 15 provided on the trumpet-shaped pipe end 4a ', which is the end of the refrigerant pipe 4A on the indoor unit side, has a tightening action surface on which the nut 15 is tightened with a spanner. A plurality of mesh-like grooves 16 are formed to strengthen the structure.

The size (outer diameter) of the nut 15 is formed so as to be larger than the size (outer diameter) of the nut of the R22 pipe connecting portion, and a screw provided on the inner peripheral surface of the nut 15 is used. The thread pitch of the portion 15a is formed to be different from the thread pitch of the R22 pipe connecting portion.

A screw portion 17 is provided on the outer surface of the pipe connection end 3a on the indoor unit side, and is configured as a male screw as a whole. Then, the taper portion 17A at the tip of the pipe connection end 3a of the pipe connection portion 5A and the trumpet-shaped pipe end 4a 'of the refrigerant pipe 4A are joined and the screw portion 17 is screwed with the nut 15, so that the refrigerant pipe 4A The indoor unit 3 is connected.
Note that the connection configuration between the refrigerant pipe 4B and the indoor unit 3 is substantially the same as the connection configuration in FIG. 4 described above, and therefore description thereof will be omitted.

Further, as shown in FIG. 5, a nut (hexagon nut) 20 for closing the charge port is screwed into a screw portion (not shown) of the charge port 8, and the tightening action surface of the nut 20. Is a nut 20 with a spanner
A plurality of linear grooves 21, for example, are formed in order to strengthen the tightening. Further, the size (outer diameter) of the nut 20 is formed so as to be larger than the size (outer diameter) of the nut of the R22 pipe connecting portion.
The thread pitch of the screw part provided on the inner peripheral surface of 0 is R22
It is formed so as to be different from the thread pitch of the pipe connecting portion.

The operation of the present embodiment will be described below.

In this structure, the plurality of grooves 10 having unevenness are provided on the tightening surface of the nut 7a of the refrigerant pipe connecting portion 7 of the pipe connecting portions 5A and 5B for connecting the outdoor unit 2 and the refrigerant pipe 4A. Therefore, for example, when the air conditioner 1 is installed, the tip of the outdoor unit side end portion 12 of the refrigerant pipe 4A is set to the outdoor unit 2
When the nut 7a is fastened by being joined to the pipe connecting end 2a, the spanner easily catches on the tightening action surface of the nut 7a due to the above-mentioned plurality of concave and convex grooves 10. That is, since the spanner hardly slips along the tightening surface of the nut 7a, the nut 7a
A can be securely and firmly tightened.

Therefore, even when a high pressure refrigerant such as HFC type refrigerant is used, the outdoor unit 2 and the refrigerant pipes 4A,
It is possible to reliably prevent a refrigerant leak at the refrigerant pipe connection portion 7 that is a connection portion with 4B.

Similarly, in this configuration, the indoor unit 3 and the refrigerant pipe 4 are
Since a plurality of mesh-shaped grooves 16 are provided on the tightening action surface of the nut 15 at the connection portion with A, when the nut 15 is tightened with a spanner, the plurality of mesh-shaped grooves 1 described above are provided.
The wrench 6 makes it easier for the wrench to catch on the tightening surface of the nut 15 and prevent it from slipping. As a result, the nut 15 can be securely and firmly tightened, and even when a high pressure refrigerant such as an HFC type refrigerant is used, refrigerant leakage from the connection portion between the refrigerant pipes 4A and 4B and the indoor unit 3 is prevented. It can be surely prevented.

Further, according to this structure, since the plurality of linear grooves 21 are provided on the tightening action surface of the nut 20 screwed into the screw portion (not shown) of the charge port 8,
When the nut 20 is tightened with the spanner, the plurality of linear grooves 21 described above allow the spanner to easily catch on the tightening action surface of the nut 20 and to prevent slipping. As a result, the nut 20 can be securely and firmly tightened,
Even when a high-pressure refrigerant such as an HFC type refrigerant is used, it is possible to reliably prevent refrigerant leakage from the charge port 8.

Further, according to this configuration, each nut 7a, 1
Since the outer diameters of 5 and 20 are made larger than the outer diameter of the nut that is used uniformly in the air conditioner for R22,
The nuts 7a, 15 and 20 can be securely and firmly tightened with a smaller force than when the R22 nut is used.

By the way, each nut 7a in the present construction,
The grooves 10, 16 and 21 which are means for securely and firmly tightening the screws 15 and 20 are air conditioners in which the grooves 10, 16 and 21 are provided and which use an HFC type refrigerant. It also has the function of identifying things. That is, the air conditioner installer or the service worker mistakenly mistakes the HCFCs (R) for the outdoor unit 2 in which the HFCs refrigerant is enclosed.
22 etc.) or an indoor unit in which a refrigerant such as CFC is sealed is attempted to be connected via a refrigerant pipe, the pipe connection portion 5 of the outdoor unit 2
Groove 1 provided on the tightening surface of the nuts 7a of A and 5B
Since 0 is always in sight, the risk of making such an incorrect connection is eliminated.

Similarly, when the refrigerant is replenished into the refrigeration cycle, even if the refilling operation is mistakenly performed using a container in which a refrigerant such as HCFC or CFC is enclosed, the piping of the outdoor unit 2 Grooves 21 provided on the tightening action surface of the nut 20 of the charge port 8 of the connection portions 5A and 5B.
Is always visible, eliminating the risk of such an incorrect refill.

Further, in order to securely and firmly tighten the nuts 7a, 15, 20 respectively, the nuts 7a, 15, 2
The configuration in which the outer diameter of 0 is larger than the outer diameter of the nut that is uniformly used in the air conditioner for R22 also provides an air conditioner that uses the nuts 7a, 15, 20 having such an enlarged outer diameter. Since it also has a function of identifying that it is an air conditioner using an HFC type refrigerant, it is possible to obtain substantially the same effect as the groove identification function.

In this construction, three kinds of grooves are provided on the tightening surface in order to strengthen the tightening of the nut. However, the present invention is not limited to this, and tightening of the nut is not limited to this. Any means of strengthening may be used. The three types of grooves are not limited to the three types and may have any pattern or shape.

Further, in the present configuration, the configuration of the connecting portion between the outdoor unit side end 12a of the refrigerant pipe 4A and the refrigerant pipe connecting portion 7 of the pipe connecting portion 5A is shown in FIG. 3, but the present invention is not limited to this. It is not limited to.

For example, as shown in FIG. 6, the pipe end 30a on the outdoor unit 2 side is provided with a threaded portion 30b on its outer surface, and is configured as a male screw as a whole. And
The outdoor unit side end 12 of the refrigerant pipe 4 </ b> A having the screw portion 12 a on the outer surface and the outdoor unit 2 side pipe end 30 a are provided with a double curved pipe 31
It is connected via a refrigerant pipe connection portion 31 having a. The screw portion 30b of the pipe end 30a is a reverse screw, and the screw portion 12a of the outdoor unit side end 12 of the refrigerant pipe 4A is also a reverse screw. The indoor unit side end of the refrigerant pipe 4A is
It has a normal flare nut specification.

The refrigerant pipe connecting portion 31 has both ends 31b, 31.
b is a trumpet-shaped tube 31a formed in a trumpet shape, and nuts 32 are provided on the respective ends of the two-bend tube 31a.
And 32. A plurality of linear grooves 33, 33, for example, are provided on the tightening action surface of the nuts 32, 32.

The threaded portions 32a provided on the inner peripheral surfaces of the nuts 32, 32 are reverse threads, and the size (outer diameter) of the nuts 32, 32 is the size of the nut of the R22 pipe connecting portion (outside). Diameter). Further, the thread pitch of the thread portion 32a is formed to be different from the thread pitch of the R22 pipe connection portion, and the thread diameter of the thread portion 32a is also formed to be different from the thread diameter of the R22 pipe connection portion. There is.

Then, the tapered portion 3 at the tip of the pipe end 30a
The outdoor unit 2 and the two bending pipe 31a are connected to each other by joining 0c and the outdoor unit side end 31b of the two bending pipe 31a and screwing the screw portion 30b with the nut 32. Then, the taper portion 12b at the tip of the outdoor unit side end portion 12 of the refrigerant pipe 4A and the refrigerant pipe 4A side tip 31b of the two-bending pipe 31a are joined and screwed with the screw portion 12a and the nut 32, so that the refrigerant The pipe 4A and the second curved pipe 31a are connected. That is, the outdoor unit 2 and the refrigerant pipe 4A are connected via the second bend pipe 31a.

That is, also in this modification, when the nuts 32, 32 are tightened by the spanner, the spanners are easily caught on the tightening action surface of the nuts 32, 32 by the plurality of linear grooves 33, 33 described above and are hard to slip. Therefore, the nuts 32, 32 can be securely and firmly tightened, and even when a high pressure refrigerant such as an HFC type refrigerant is used, the refrigerant from the connecting portion between the refrigerant pipe 4A and the outdoor unit 2 Leaks can be reliably prevented.

Also in this modification, the groove 33 is made of HFC.
It has the function of identifying the use of similar refrigerants.

Further, according to this modification, the refrigerant pipe 4A
12a of the end 12 of the outdoor unit on the side, the screw 30b of the pipe end 30a on the side of the outdoor 2 and the screw 32 of the nut 32.
Since each of a has a reverse screw, the HCFCs and CFCs are erroneously mistaken for the outdoor unit 2 in which the HFCs refrigerant is enclosed.
Even if an indoor unit in which a refrigerant of a similar type is enclosed is attempted to be connected via a refrigerant pipe, since the screw portion of the indoor unit for a refrigerant of HCFCs or CFCs is a forward screw, it is not connected to the refrigerant pipe for a refrigerant of HCFCs or CFCs. It becomes impossible to screw with the nut 32 of the second curved pipe 31a. Therefore, the risk of making such an incorrect connection is eliminated.

The thread pitch of the thread portion 32a is set to R22.
The HFC type refrigerant use discriminating function described above is also formed so that it is formed so as to have a different thread pitch from the pipe connecting portion for R22, and the screw diameter of the screw portion 32a is different from the screw diameter of the pipe connecting portion for R22. And has the same effect.

(Second Embodiment) FIGS. 7A and 8
FIG. 8A is a plan view showing the configuration of the pipe connection portion (packed valve) in FIG. 2 of the first embodiment as seen from the rotation insertion hole side, and particularly FIG. 8A shows the wrench hole cover screw removed. It is a top view which shows the whole structure at the time of doing. In addition, FIG.
(A) is a side view showing a state in which the slide valve element is slid to release the refrigerant passage. The first embodiment is the first
The pipe connecting portion (packed valve) and its peripheral portion in the embodiment are characterized, and other explanations are substantially the same as the configuration of a normal air conditioner or the configuration of the air conditioner of the first embodiment. Therefore, the description thereof is omitted.

According to FIGS. 7A to 9A, the packed valve 40 is connected to the pipe 41 of the outdoor unit 2. The packed valve 40 includes a slide valve body 42, a wrench hole cover screw 43 that covers a rotation insertion hole (for example, a hexagon wrench hole) 42 a of the slide valve body 42, and a flare nut (hexagon nut) that connects a refrigerant pipe 44. 45
a refrigerant pipe connecting portion 45 having a and a flare nut 46a
And a charge port 46 for replenishing the refrigerant.

The packed valve 40 has a hexagon wrench hole 42.
By rotating a to slide the slide valve element 42, it is possible to control the flow / shutoff of the refrigerant through the packed valve.

Further, the connection port 45a of the refrigerant pipe connection portion 45
A threaded portion 45b is provided on the outer surface of the, and this threaded portion is a reverse thread. A screw portion 46b is provided on the outer surface of the charge port 46, and the screw portion 46b is provided.
The screw is also a reverse screw like the screw portion 45b. Flare nut 4
The thread portion of 5a and the thread portion of the flare nut 46a are also reverse threads. The flare nut 45a is screwed into the thread portion 45b of the connection port 45a, and the flare nut 46a is screwed into the thread portion 46b of the charge port 46. There is. In addition,
Reference numeral 47 in the drawing denotes a mounting base.

Then, the packed valve 40 of the present embodiment.
Hex wrench hole 42a, wrench hole cover screw 4
3, the diameter of the charge port 46, the outer diameter of the flare nut 45a, and the outer diameter of the flare nut 46a are the hexagonal wrench hole 52a, the wrench hole cover screw 53, and the flare of the conventional HCFC type refrigerant (R22) packed valve 50. It is designed to be larger than the outer diameter of the nut 55a and the outer diameter of the flare nut 56a.

Here, the HCFC corresponding to the packed valve 40 for the high-pressure refrigerant shown in FIGS. 7A and 8A.
FIG. 7B and FIG. 8 show a packed valve 50 for a similar refrigerant.
It shows in (b).

FIGS. 7 (a) to 8 (a) and 7 (b)
According to FIG. 8B, the outer diameter of the wrench hole cover screw 43 of the packed valve 40 (in this embodiment, the outer diameter of the rectangle is defined as a line segment that connects the opposite sides of the rectangle and is orthogonal to the opposite side). D1 is larger than the outer diameter d1a of the wrench hole cover screw 53 of the packed valve 50 (d1>
d1a).

The inner diameter d2 of the hexagonal wrench hole 42a of the packed valve 40 is larger than the inner diameter d2a of the hexagonal wrench hole 52a of the packed valve 50 (d2> d).
2a). Further, the flare nut 45 of the packed valve 40
The outer diameter d3 of a is the flare nut 5 of the packed valve 50.
It is larger than the outer diameter d3a of 2a (d3> d3
a).

The outer diameter d4 of the flare nut 46a of the packed valve 40 is larger than the outer diameter d4a of the flare nut 56a of the packed valve 50 (d4>).
d4a).

Further, the inner diameter d2 of the hexagon wrench hole 42a of the packed valve 40 is equal to the outer radius r of the slide valve body 42.
(D2> r).

The operation of the next embodiment will be described.

According to this structure, the inner diameter d2 of the hexagon wrench hole 42a of the packed valve 40 in which the high pressure refrigerant is sealed is set to H.
Hexagon wrench hole 5 of packed valve 50 for CFC type refrigerant
Since the inner diameter d2a of 2a is made larger, the rotating operation of the hexagonal wrench hole 42a becomes smoother than that of the packed valve 50 for HCFC type refrigerant, even if the refrigerant filled in the packed valve 40 has a high pressure.

Therefore, even when the slide valve body 42 of the packed valve 40, in which the high-pressure refrigerant is enclosed, is opened when the air conditioner 1A is used, the hexagonal shape is easily exerted with a force substantially the same as that of the packed valve for the HCFC type refrigerant. Wrench hole 52
The slide valve body 42 can be slid by rotating a, and as a result, the refrigerant passage can be opened via the packed valve 40 (see FIG. 9A).

Further, even when the slide valve body 42 of the packed valve 40 in which the high pressure refrigerant is enclosed is closed during the production of the air conditioner 1A or the relocation of the air conditioner 1A, the packed valve for the HCFC type refrigerant is used. The hexagon wrench hole 52a can be easily rotated with the same force to slide the slide valve body 42, and as a result, the tightening by the slide valve body 42 can be strengthened and the refrigerant passage can be completely blocked. (See FIG. 9B).

Therefore, according to the air conditioner 1A of the present configuration, the air conditioner installer or the service operator can perform the operation of moving the slide valve body 42 of the packed valve 40 in which the high-pressure refrigerant is enclosed by the packed HCFC refrigerant. This can be performed by substantially the same operation as the valve, and the burden associated with using the high pressure refrigerant can be eliminated. Also, the installation work and service work time can be shortened.

Further, according to this structure, since the inner diameter d2 of the hexagonal wrench hole 42a of the packed valve 40 in which the high pressure refrigerant is sealed is made larger than the outer peripheral radius r of the slide valve body 42, the conventional HCFC type refrigerant is used. Packed valve 5 for
0 (the inner diameter d2a of the hexagonal wrench hole 52a <the outer peripheral radius r1 of the slide valve body 52) becomes smoother than that of the hexagonal wrench hole 52a, and the above-described effect of the slide operation of the slide valve body 42 can be obtained. it can.

According to this structure, the outer diameter d1 of the wrench hole cover screw 43 of the packed valve 40 in which the high pressure refrigerant is sealed is smaller than the outer diameter d1a of the wrench hole cover screw 53 of the packed valve 50 for HCFC type refrigerant. Since it is also made large, it can be identified that the air conditioner 1A using the wrench hole cover screw 43 having such an enlarged outer diameter is an air conditioner using an HFC type refrigerant. The effects related to the identification function described in the embodiment can be obtained.

Similarly, the inner diameter d2 of the hexagon wrench hole 42a of the packed valve 40 is made larger than the inner diameter d2a of the hexagon wrench hole 52a of the packed valve 50, and the outer diameter d3 of the flare nut 45a of the packed valve 40 is set to the packed valve 50. The flare nut 52a of the packed valve 40 is made larger than the outer diameter d3a of the flare nut 52a.
The outer diameter d4 of the flare nut 56a of the packed valve 50.
The air conditioner 1A using the hexagonal wrench hole 42a having the enlarged inner diameter, and the flare nut 45a and the flare nut 46a having the enlarged outer diameter uses the HFC type refrigerant because the outer diameter d4a is larger than the outer diameter d4a. It is possible to identify the air conditioner, and it is possible to obtain the same effect regarding the identification function.

In this embodiment, the rotation insertion hole is
Although the hexagonal wrench hole having a hexagonal shape is used, the present invention is not limited to this, and a triangular triangular wrench hole,
It may have any shape, such as a square wrench hole, a cross-shaped wrench hole, and a keyhole-shaped wrench hole.

In addition, in the first and second embodiments, in order to more clearly show that the air conditioner is a device using a HFC type refrigerant, a required portion of the pipe connection portion (for example, the surface of the wrench hole cover screw) ) To a high pressure refrigerant (eg R410
A marking indicating A) may be provided.

Further, in the first and second embodiments, the split air conditioner has been described. However, the structure including means for strengthening the tightening of the nut of the charge port of the packed valve is an air conditioner using the packed valve. if there is,
It can be applied without being limited to the split type.

[0075]

As described above, according to the air conditioner using the high pressure refrigerant according to the present invention, the nut for closing the charge port for replenishing the high pressure refrigerant and the connection between the outdoor unit and the indoor unit and the refrigerant pipe. The nut for tightening and fixing the part can be securely and firmly tightened by the action of the tightening strong means provided on the nut, so that the refrigerant leak from the charge port, the outdoor unit, and the connection part between the indoor unit and the refrigerant pipe is sure. Therefore, the reliability of the air conditioner using the high-pressure refrigerant can be improved.

Further, according to the present invention, the tightening strengthening means provided on the nut allows the installer or the service operator to easily identify that the air conditioner uses the high pressure refrigerant. , The risk of mistakenly refilling the refrigerant of HCFCs or CFCs, connecting the connecting devices for the refrigerants of HCFCs or CFCs, etc. can be eliminated, and the reliability can be further improved.

Further, according to the air conditioner of the present invention, the rotation operation of the rotary slide insertion hole becomes smoother (or about the same) as the rotation operation of the rotary slide insertion hole in the HCFC type refrigerant device. Therefore, even if the high-pressure refrigerant is enclosed, the slide valve body of the refrigerant circulation control on-off valve can be easily slid. As a result,
Air conditioner installers and service workers can perform the slide valve body movement operation of the on-off valve by almost the same operation as the conventional on-off valve for HCFC type refrigerants, and the burden associated with the use of high-pressure refrigerants. It can be resolved. Also, the installation work and service work time can be shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a split type air conditioner according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a pipe connection portion surrounded by a broken line A in FIG.

FIG. 3 is an enlarged view showing a pipe connection portion surrounded by a broken line C (C ′) in FIG.

FIG. 4 is an enlarged view showing a pipe connection portion surrounded by a broken line B in FIG.

5 is an enlarged view showing a charge port surrounded by a broken line D in FIG.

FIG. 6 is an enlarged view showing a modified example of a pipe connecting portion surrounded by a broken line C (C ′) in FIG. 2.

FIG. 7A is a plan view showing the configuration of the pipe connecting portion in FIG. 2 of the first embodiment as seen from the rotation insertion hole side, and FIG.
[Fig. 3] is a plan view showing a configuration of a pipe connection portion of an air conditioner using an HCFC refrigerant as viewed from a rotation insertion hole side.

8A is a plan view showing a state in which a wrench hole cover screw in FIG. 7A is removed, and FIG. 8B is a plan view showing a state in which the wrench hole cover screw in FIG. 7B is removed.

9A is a side view showing a state where a slide valve element is slid to release a refrigerant passage, and FIG. 9B is a side view showing a state where the slide valve element is slid to block the refrigerant passage.

[Explanation of symbols]

1, 1A air conditioner 2 outdoor unit 3 indoor units 4A, 4B, 44 Refrigerant piping 4a 'Trumpet-shaped pipe end 5A, 5B, 40 Piping connection (packed valve) 6 Wrench hole cover screw 7,45 Refrigerant piping connection 7a, 15, 20 nuts 8,46 Charge port 10, 16, 21, 33 groove 11, 12a, 17, 30b, 32a Screw part 30a Pipe end 31 Refrigerant piping connection 31a Two curved pipe 42 Slide valve body 42a Hexagon wrench hole 43 Wrench hole cover screw 45a flare nut 46a flare nut

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25B 45/00 F16B 37/04 F25B 41/00 F25B 41/04 F25B 1/00 395

Claims (7)

(57) [Claims] 1. HCFC as a circulating refrigerant in a refrigeration cycle
An air conditioner using a high-pressure refrigerant having a higher saturation pressure at the same temperature than a similar refrigerant, including a charge port for replenishing the refrigeration cycle with the high-pressure refrigerant, and a nut for closing the charge port, wherein the nut An air conditioner characterized in that at least a part thereof is provided with a tightening strengthening means for strengthening tightening of the nut. 2. An air that constitutes a refrigeration cycle by connecting an outdoor unit and an indoor unit, which are configured as separate units, with a refrigerant pipe, and circulating a refrigerant through the refrigerant pipe to the outdoor unit and the indoor unit. A harmony machine, wherein the circulating refrigerant is HC
An air conditioner using a high-pressure refrigerant having a saturation pressure higher than that of FC type refrigerants at the same temperature, comprising a nut for tightening and fixing a connecting portion between the outdoor unit and the indoor unit and the refrigerant pipe, and at least one of the nuts. An air conditioner characterized in that a tightening strengthening means for strengthening the tightening of the nut is provided in the portion. 3. The tightening strengthening means is a plurality of grooves formed on a tightening surface of the nut.
Air conditioner described. 4. The tightening strengthening means is such that the outer diameter of the nut is made larger than the outer diameter of the nut used in the air conditioner using the HCFC refrigerant.
Air conditioner described. 5. The air conditioner according to claim 1, wherein the tightening strengthening means also has an identification function of identifying that a high-pressure refrigerant is used as the circulating refrigerant. 6. An air that constitutes a refrigeration cycle by connecting an outdoor unit and an indoor unit, which are configured as separate units, with a refrigerant pipe, and circulating a refrigerant through the refrigerant pipe to the outdoor unit and the indoor unit. A harmony machine, wherein the circulating refrigerant is HC
In an air conditioner using a high-pressure refrigerant having a higher saturation pressure at the same temperature than that of the FC type refrigerant, it is possible to cut off the flow of the high-pressure refrigerant in the connection part to the connection part of the outdoor unit connected to the refrigerant pipe. An air conditioner comprising an on-off valve having a slide valve body, wherein an inner diameter of a rotary slide insertion hole of the slide valve body is made larger than an outer radius of the slide valve body. 7. An air that constitutes a refrigeration cycle by connecting an outdoor unit and an indoor unit, which are configured as separate units, with a refrigerant pipe, and circulating a refrigerant through the refrigerant pipe to the outdoor unit and the indoor unit. A harmony machine, wherein the circulating refrigerant is HC
In an air conditioner using a high-pressure refrigerant having a higher saturation pressure at the same temperature than that of the FC type refrigerant, it is possible to cut off the flow of the high-pressure refrigerant in the connection part to the connection part of the outdoor unit connected to the refrigerant pipe. An on-off valve having a slide valve body is provided, and the inner diameter of the rotary slide insertion hole of the slide valve body is set to the rotary slide insertion hole of the slide valve body of the on-off valve which is uniformly used in the HCFC-type refrigerant air conditioner. An air conditioner characterized by being made larger than the inner diameter.