JP2001133084A - Method and device for eliminating water being mixed into refrigerant gas flowing through refrigerant circulation piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate water being mixed into a refrigerant gas flowing through refrigerant circulation piping without replacing a water-eliminating filter being provided at the refrigerant circulation piping while a device is being operated. SOLUTION: A bypass path 4 is provided in parallel with a refrigerant main path 3 in refrigerant circulation piping 1, a water-eliminating filter 27 is provided in the bypass path 4, a refrigerant gas is passed through the bypass path 4 during operation, the bypass path 4 is closed for sealed state when water is to be eliminated, and the inside of the bypass path 4 in the closed state is evacuated and dried, thus drying the water-eliminating filter 27 containing water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing moisture mixed in a refrigerant gas flowing through a refrigerant circulation pipe in a cooling / heating apparatus, a refrigerating apparatus, etc. using a refrigerant gas, and an apparatus for removing the moisture. .

[0002]

2. Description of the Related Art In a cooling / heating device, a refrigerating device, or the like using a refrigerant gas, when water is mixed in a refrigerant gas flowing through a refrigerant distribution pipe, the water freezes and becomes an obstacle in the pipe.
The flow of the refrigerant gas is alienated, and the original function of the device cannot be exhibited.

Accordingly, it is necessary to avoid mixing of water into the refrigerant gas flowing through the refrigerant flow pipe as much as possible. For example, it is extremely difficult to avoid the water flowing into the pipe during construction. I have.

[0004] Therefore, in a cooling / heating device or a refrigerating device using a refrigerant gas, a water removal filter such as a drier for removing water is provided in the refrigerant circulation pipe in order to remove water mixed in the refrigerant gas. I have. Silica gel is usually used as such a water removal filter. However, silica gel cannot be further absorbed if a certain amount of water is adsorbed. Therefore, in such a case, the water removal filter provided in the refrigerant circulation pipe is removed,
It needs to be replaced with a new one.

[0005]

The water removal filter provided in the refrigerant flow pipe includes a type which is detachably provided in the refrigerant flow pipe and a type which is provided by being enclosed in the refrigerant flow pipe.

When the water removal filter is replaced, if the water removal filter is of a type that is detachably provided in the refrigerant flow pipe, it is necessary to temporarily stop the operation of the cooling / heating device or the refrigerating device. There was a problem.

In the case where the water removal filter is of a type provided enclosed in a refrigerant flow pipe, the pipe is cut with a cutter to remove and replace the water removal filter, or the weld is heated at a high temperature, After the weld is broken, the moisture removal filter must be removed and replaced, and after replacement, the pipes must be connected again by flaring or welding. In this operation, the operation of replacing the water removal filter cannot be performed unless the refrigerant gas filled in the pipe is discarded or collected, and a troublesome operation is required.

An object of the present invention is to remove moisture mixed in refrigerant gas flowing through a refrigerant flow pipe without changing a water removal filter provided in the refrigerant flow pipe while operating a cooling / heating device or a refrigerating device. It is an object of the present invention to provide a method for removing moisture and a device for removing moisture.

[0009]

According to one aspect of the present invention, there is provided a method for removing water mixed in a refrigerant gas flowing through a refrigerant flow pipe. A bypass passage is provided in parallel with the above, a moisture removal filter is provided in the bypass passage, refrigerant gas is passed through the bypass passage during normal operation, and the bypass passage is closed and sealed when moisture is removed. It is characterized in that the inside of the passage is dried under vacuum to dry the moisture removal filter containing moisture.

In the method for removing water mixed in the refrigerant gas, the water mixed in the refrigerant gas is adsorbed by the water removal filter provided in the bypass passage by passing the refrigerant gas through the bypass passage during normal operation. In removing moisture adsorbed on the moisture removal filter, the bypass passage is closed to allow the refrigerant gas to pass through the refrigerant main passage, and the inside of the closed bypass passage is vacuum-dried to remove moisture containing moisture. By drying the removal filter, moisture mixed in the refrigerant gas flowing through the refrigerant flow pipe can be removed while the apparatus is operating and without replacing the moisture removal filter.

According to a second aspect of the present invention, there is provided an apparatus for removing water mixed with refrigerant gas flowing through a refrigerant circulation pipe by being mounted in the middle of a refrigerant circulation pipe, wherein a filter housing is integrated in the refrigerant circulation pipe. And a bypass passage is provided in parallel with a refrigerant main passage in the refrigerant flow pipe through the filter housing, and the first and second bypass passages are opened in the bypass main passage.
The main valve seat which partitions the refrigerant main passage is provided in the refrigerant flow pipe between the first and second openings, and the first and second openings of the bypass passage are provided. Openings are provided with first and second valve seats, and the main valve seat and the first and second valve seats are valve bodies for opening and closing the main valve seat and the first and second valve seats. Are provided in the bypass passage, and a moisture removal filter is provided in the bypass passage for adsorbing and removing moisture mixed in the refrigerant gas. Further, the filter housing communicates with the bypass passage to collect and fill the refrigerant gas in the bypass passage. And a joint for deaeration is provided.

In such a device for removing moisture mixed in the refrigerant gas, the main valve seat is normally closed by operating the valve body, and the first and second valves are operated.
The refrigerant gas flowing in the refrigerant flow pipe enters the bypass passage by opening the valve seat of the valve, and is circulated through the water removal filter provided in the bypass passage, whereby the water mixed in the refrigerant gas is removed. Is adsorbed and removed by the water removal filter. In removing moisture contained in the moisture removal filter, the main valve seat is opened by operating the valve body, and the first and second valve seats are closed to prevent the refrigerant gas from passing through the bypass passage. In this state, a hose is connected to a joint provided in the filter housing to collect and deaerate the refrigerant gas in the bypass passage, thereby drying the moisture-removing filter containing moisture. After the moisture removal filter is dried, the bypass passage is filled with a refrigerant gas, the valve body is operated to close the main valve seat, and the first and second valve seats are opened so that the refrigerant gas enters the bypass passage. To In this way, without leaving the device running and without changing the moisture removal filter,
Water mixed in the refrigerant gas flowing through the refrigerant flow pipe can be removed.

According to a third aspect of the present invention, in the second aspect, a water detecting means for detecting the presence or absence of water in the refrigerant gas flowing in the refrigerant circulation pipe is provided at an appropriate position of the refrigerant circulation pipe. And

As described above, since the water detecting means for detecting the presence or absence of moisture in the refrigerant gas flowing in the refrigerant flow pipe is provided, the presence or absence of water in the refrigerant gas flowing in the refrigerant flow pipe can be confirmed by the water detecting means. In addition, moisture mixed in the refrigerant gas can be more effectively and reliably removed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and FIG. 2 show a water-removing device which is installed in the middle of a refrigerant circulation pipe of a cooling / heating device or a refrigerating apparatus using a refrigerant gas to remove moisture mixed in the refrigerant gas flowing through the refrigerant circulation pipe. 1 shows an example of the embodiment of the removing device.

The apparatus for removing water according to the present embodiment includes a refrigerant flow pipe 1
The filter housing 2 is integrally provided on a side surface in the middle of the above. In the filter housing 2, a bypass passage 4 is provided in parallel with the refrigerant main passage 3 in the refrigerant flow pipe 1, and the bypass passage 4 has a first opening opening to the refrigerant main passage 3. Portion 4a and second opening 4b
Is provided.

A main valve seat 5 for partitioning the internal refrigerant main passage 3 is provided in the refrigerant flow pipe 1 between the first and second openings 4a and 4b. The first and second openings 4a and 4b of the bypass passage 4 are provided with first and second valve seats 6 and 7, respectively. A valve body 8, which opens and closes the main valve seat 5 and the first and second valve seats 6, 7, is provided on the main valve seat 5 and the first and second valve seats 6, 7.
9 are provided. In this example, the main valve seat 5 and the first valve seat 6 are structured so that an opening and closing operation is performed so that one of them is opened and the other is closed by a common valve element 8 as shown in the figure.

In order to open and close the main valve seat 5 and the first valve seat 6 with the valve element 8, a first valve element operating mechanism 10 is provided integrally with the refrigerant flow pipe 1. The first valve body operating mechanism 10 includes a mounting hole 11 provided in the refrigerant flow pipe 1 concentrically with each hole of the main valve seat 5 and the first valve seat 6, and an opening of the mounting hole 11. A cap body 12 for closing the portion, a drive valve shaft 14 that penetrates the center of the cap body 12 through an O-ring 13 in a fluid-tight manner, and a bottom portion 15a is screwed into a threaded portion 14a at the tip of the drive valve shaft 14. The relay housing 15 is open at the front end and moves forward and backward in the mounting hole 11 by the rotation of the screw portion 14a. The base end supporting the valve body 8 is fitted into the outer periphery of the screw portion 14a. Driven valve shaft 16
And coil springs 17a and 17b which are arranged in the relay housing 15 with the base end flange 16a of the driven valve shaft 16 as a boundary and transmit the longitudinal movement of the relay housing 15 to the driven valve shaft 16. .

The front end of the coil spring 17a is in contact with the inner flange 15b at one end of the relay housing 15, and the other end is in contact with the flange 16a. One end of the coil spring 17b is in contact with the flange portion 16a, and the other end is supported by the bottom 15a of the relay housing 15.

According to the first valve body operating mechanism 10, when the drive valve shaft 14 is rotated in a certain direction, the screw portion 14
a rotates together, the rotation of the screw portion 14a causes the relay housing 15 to move in a direction approaching the main valve seat 5, and this movement is transmitted to the driven valve shaft 16 via the coil springs 17a and 17b, and the valve body 8 Is opened from the main valve seat 5 away from the main valve seat 5 and the drive valve shaft 14 continues to rotate in the same direction.
Abuts on the first valve seat 6 to close the first valve seat 6. When the drive valve shaft 14 is turned in the opposite direction, the valve body 8 separates from the first valve seat 6 to open the first valve seat 6, and when the drive valve shaft 14 continues to rotate in the same direction, the valve body 8 comes into contact with the main valve seat 5 to close the main valve seat 5.

In order to open and close the second valve seat 7 with the valve body 9, the second valve body operating mechanism 18 is integrated with the refrigerant flow pipe 1 similarly to the first valve body operating mechanism 10. Is provided. The second valve body operating mechanism 18 is provided with the second valve seat 7.
Mounting hole 19 provided in the refrigerant flow pipe 1 concentrically with the hole, and a cap body 2 for closing the opening of the mounting hole 19
0, a drive valve shaft 22 that penetrates the center of the cap body 20 through an O-ring 21 in a fluid-tight manner,
The bottom 23a is screwed into the screw portion 22a at the tip of the relay housing 23. The relay housing 23 has an open front end that moves back and forth in the mounting hole 19 by the rotation of the screw portion 22a. A driven valve shaft 24 having an end-side tube fitted into the outer periphery of the screw portion 22a and a flange 24a at the base end of the driven valve shaft 24 in the relay housing 23.
Springs 25a, 2 for transmitting the longitudinal movement of the shaft to the driven valve shaft 24
5b.

The coil spring 25a has its front end in contact with the inner flange 23b at one end of the relay housing 23 and its other end in contact with the flange portion 24a. One end of the coil spring 25b is in contact with the flange portion 24a, and the other end is supported by the bottom 23a of the relay housing 23.

According to the second valve body operating mechanism 18, when the drive valve shaft 22 is rotated in a certain direction, as in the first valve body operating mechanism 10, the screw portion 22a turns together. By the rotation of the screw portion 22a, the relay housing 23 moves in the direction approaching the second valve seat 7, and this movement is performed by the coil spring 25.
The power is transmitted to the driven valve shaft 24 via the a and 25b, and the valve element 9 abuts on the second valve seat 7 to close the second valve seat 7. When the drive valve shaft 22 is turned in the opposite direction, the valve element 9 separates from the second valve seat 7 and opens the second valve seat 7.

A filter set portion 26 is provided in the bypass passage 4 in the filter housing 2. The filter set portion 26 has a cartridge type water removal filter 27 for adsorbing and removing moisture mixed in the refrigerant gas. The filter is set from a filter replacement port 28 provided in the bypass passage 4. The filter exchange port 28 is closed by an opening / closing lid 29. The water removing filter 27 has a cylindrical case 30 filled with a water absorbent 31 made of silica gel.

The filter housing 2 is provided with a joint 32 with a valve which communicates with the bypass passage 4 to collect, fill and deaerate the refrigerant gas in the bypass passage 4.

At an appropriate position in the refrigerant flow pipe 1,
A moisture detecting means 33 for detecting the presence or absence of moisture in the refrigerant gas flowing in the refrigerant flow pipe 1 is provided. In the present embodiment, a sight glass that changes color by reacting with moisture is used as the moisture detecting means 33. In this example, a window 34 is formed in the opening / closing lid 29 for opening and closing the filter exchange port 28 of the filter housing 2 as a place where the moisture detecting means 33 made of sight glass is provided. The sight glass used is set. The sight glass used as the moisture detecting means 33 originally has a green color, and changes color to yellow by reacting with the moisture, and returns to the original green color when the moisture disappears. Can be confirmed.

Further, a valve-fitted joint 35 communicating with the refrigerant main passage 3 is provided at an appropriate position of the refrigerant flow pipe 1.

In the above-described apparatus, during operation, as shown in FIG. 1, the main valve seat 5 is closed by the valve body 8 and the first valve seat 6 and the second valve seat 7 are opened, for example, During heating operation,
The refrigerant gas flows from the refrigerant flow pipe 1 to the first
Is circulated through the moisture removal filter 27 through the opening 4a, and returns to the refrigerant flow pipe 1 through the second opening 4b. During the cooling operation, the refrigerant gas flows from the refrigerant flow pipe 1 through the second opening 4b as indicated by the white arrow.
Through the water removal filter 27 and through the first opening 4
The refrigerant is circulated so as to return to the refrigerant distribution pipe 1 via a.
When the refrigerant gas flows through the moisture removal filter 27 as described above, if moisture is mixed in the refrigerant gas,
This moisture is adsorbed by the adsorbent 31 and removed.

When the adsorbent 31 adsorbs a certain amount of water, it cannot be adsorbed any more. If the moisture in the refrigerant gas cannot be completely absorbed by the adsorbent 31 and the moisture still remains, this state can be confirmed by the moisture detecting means 33.

In such a case, the moisture adsorbed by the adsorbent 31 is released to the outside to dry the adsorbent 31 as described below, and the moisture in the refrigerant gas is again brought into a state capable of adsorbing the moisture in the refrigerant gas. Is removed.

First, as shown in FIG. 3, the operation of the first valve body operating mechanism 10 moves the valve body 8 to separate the adsorbent 31 from the main valve seat 5. Close 6. Further, by operating the second valve body operating mechanism 18,
The second valve seat 7 is closed by moving the valve element 9. By this operation, the refrigerant gas does not flow to the bypass passage 4 and the main valve seat 5
And flows only to the refrigerant main passage 3. Therefore, even during this operation, the refrigerant gas continues to flow, and the operation of the air conditioner can be continued.

Next, both ends of the bypass passage 4 are connected to the valve bodies 8 and 9.
Then, as shown in the figure, a refrigerant recovery device 39 is connected to a joint 32 provided in the filter housing 2 via a high-pressure hose 36, a manifold gauge 37, and a high-pressure hose 38, and the bypass passage 4 The refrigerant gas inside is recovered in the cylinder 40.

After the refrigerant gas in the bypass passage 4 is recovered, the inside of the bypass passage 4 is evacuated and vacuum dried by a vacuum pump 42 connected to the manifold gauge 37 via a high-pressure hose 41. As a result, the water adsorbed by the adsorbent 31 is removed, and the state returns to a state where water can be adsorbed again.

After the adsorbent 31 has been dried in this way, as shown in FIG. 4, the joint 35 provided in the refrigerant flow pipe 1 and the manifold gauge 37 are connected by a high-pressure hose 43, and The refrigerant gas in the pipe 1 is filled in the bypass passage 4, and the pressure in the refrigerant circulation pipe 1 and the inside of the bypass passage 4 are made equal.

Thereafter, by operating the first valve body operating mechanism 10, the valve body is moved, separated from the first valve seat 6, and the first valve seat 6 is opened and the main valve seat 5 is closed. . Also,
By operating the second valve operating mechanism 18, the valve 10 is moved to open the second valve seat 7. By this operation, the refrigerant gas flows again into the bypass passage 4 and the water removal filter 2
The moisture in the refrigerant gas is again adsorbed and removed by the dried adsorbent 31 filled in the inside 7.

This operation can be repeated until the moisture detecting means 33 confirms that the moisture in the refrigerant gas has been completely removed.

When it is necessary to replace the water removal filter 27, the replacement can be performed as follows.

As in the above operation, first, as shown in FIG. 3, a first valve body operating mechanism 10 and a second valve body operating mechanism 18 are provided.
To open the main valve seat 5 and the first valve seat 6 and the second
The valve seat 7 is closed.

Next, a refrigerant recovery device 39 is connected to a joint 32 provided in the filter housing 2 via a high-pressure hose 36, a manifold gauge 37, and a high-pressure hose 38, and the refrigerant gas in the bypass passage 4 is transferred to a cylinder 40. Collect within.

After the refrigerant gas in the bypass passage 4 has been recovered, the lid 29 is removed to remove the moisture removal filter 27 from the filter set section 26, out of the filter exchange port 28, and then a new moisture removal filter 27 is inserted. Then, the filter exchange port 28 is closed with the opening / closing lid 29.

Next, after the inside of the bypass passage 4 is evacuated by a vacuum pump 42 connected to the manifold gauge 37 via a high-pressure hose 41, a joint 35 provided in the refrigerant flow pipe 1 as shown in FIG. And the manifold gauge 37 are connected by a high-pressure hose 43, and the refrigerant gas in the refrigerant flow pipe 1 is filled in the bypass passage 4, so that the pressure in the refrigerant flow pipe 1 and the inside of the bypass path 4 are made equal.

Thereafter, by operating the first valve body operating mechanism 10, the valve body is moved to separate from the first valve seat 6 to make the first valve seat 6 and close the main valve seat 5. . Also,
By operating the second valve operating mechanism 18, the valve 10 is moved to open the second valve seat 7.

[0043]

As described above, according to the present invention, while operating a cooling / heating device or a refrigeration device using a refrigerant gas,
There is an effect that water mixed in the refrigerant gas flowing through the refrigerant flow pipe can be easily and reliably removed without replacing the water removal filter provided in the refrigerant flow pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a device for removing moisture mixed in a refrigerant gas according to the present invention.

FIG. 2 is a longitudinal sectional view showing a configuration of first and second valve body operating mechanisms used in FIG.

FIG. 3 is an explanatory diagram showing a drying operation state of a moisture removal filter that has adsorbed moisture in a refrigerant gas.

FIG. 4 is an explanatory view showing an operation state in which a refrigerant gas is filled in a bypass passage after a moisture removal filter is dried.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant distribution pipe 2 Filter housing 3 Refrigerant main passage 4 Bypass passage 4a, 4b First and second openings 5 Main valve seat 6,7 First and second valve seat 8,9 Valve body 10 First valve Body operation mechanism 11 Mounting hole 12 Cap body 13 O-ring 14 Drive valve shaft 14a Screw portion 15 Relay housing 15a Bottom portion 15b Inner flange 16 Follower valve shaft 16a Flange portions 17a, 17b Coil spring 18 Second valve body operation mechanism 19 Mounting hole Reference Signs List 20 cap body 21 O-ring 22 drive valve shaft 22a screw portion 23 relay housing 23a bottom portion 23b inner collar 24 driven valve shaft 24a flange portion 25a, 25b coil spring 26 filter set portion 27 moisture removal filter 28 filter exchange port 29 opening / closing lid 30 case DESCRIPTION OF SYMBOLS 31 Adsorbent 32 Joint 33 Water detecting means 34 Window 35 Joint 36 High pressure hose 37 Manifold gauge 38 High pressure hose 39 Refrigerant recovery device 40 Cylinder 41 High pressure hose 42 Vacuum pump 43 High pressure hose

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[Procedure amendment]

[Submission Date] July 17, 2000 (2007.1)
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

According to the first aspect of the present invention, there is provided an apparatus for removing moisture contained in refrigerant gas flowing through a refrigerant flow pipe, which is mounted in the middle of the refrigerant flow pipe. A filter housing is provided integrally in the middle of the refrigerant flow pipe, a bypass path is provided in parallel with a refrigerant main path in the refrigerant flow pipe through the filter housing, and the bypass path has First and second openings that open to the refrigerant main passage are provided, and a main valve seat that partitions the refrigerant main passage is provided in the refrigerant flow pipe between the first and second openings,
The first and second openings of the bypass passage have first and second openings.
A second valve seat is provided, and the main valve seat and the first and second valve seats are provided with valve bodies for opening and closing the main valve seat and the first and second valve seats, respectively, and The first of the valve elements
In the valve element that opens and closes the second valve seat, each opens and closes by coming into contact with and separating from the first and second valve seats from the refrigerant main passage side,
The abutment is provided so as to abut via a coil spring, a moisture removal filter is provided in the bypass passage for absorbing and removing moisture mixed in the refrigerant gas, and the filter housing further communicates with the bypass passage. A joint for collecting, filling, and degassing the refrigerant gas in the bypass passage is provided.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

In such a device for removing moisture mixed in the refrigerant gas, the main valve seat is normally closed by operating the valve body, and the first and second valves are operated.
The refrigerant gas flowing in the refrigerant flow pipe enters the bypass passage by opening the valve seat of the valve, and is circulated through the water removal filter provided in the bypass passage, whereby the water mixed in the refrigerant gas is removed. Is adsorbed and removed by the water removal filter. In removing moisture contained in the moisture removal filter, the main valve seat is opened by operating the valve body, and the first and second valve seats are closed to prevent the refrigerant gas from passing through the bypass passage. In this state, a hose is connected to a joint provided in the filter housing to collect and deaerate the refrigerant gas in the bypass passage, thereby drying the moisture-removing filter containing moisture. After the moisture removal filter is dried, the bypass passage is filled with a refrigerant gas, the valve body is operated to close the main valve seat, and the first and second valve seats are opened so that the refrigerant gas enters the bypass passage. To In this way, without leaving the device running and without changing the moisture removal filter,
Water mixed in the refrigerant gas flowing through the refrigerant flow pipe can be removed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Deleted

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

According to a second aspect of the present invention, in the first aspect, a moisture detecting means for detecting presence or absence of moisture in the refrigerant gas flowing in the refrigerant circulation pipe is provided at an appropriate position of the refrigerant circulation pipe. And

Claims (3)

[Claims] 1. A bypass passage is provided in parallel with a refrigerant main passage in a refrigerant flow pipe, a moisture removal filter is provided in the bypass passage, and refrigerant gas is passed through the bypass passage during normal operation, and bypassed when moisture is removed. A method for removing water mixed in refrigerant gas flowing through a refrigerant flow pipe, comprising closing a passage to make it a closed state, drying the inside of the closed bypass passage under vacuum, and drying a water removal filter containing water. 2. A device for removing moisture mixed in a refrigerant gas flowing through a refrigerant flow pipe by being mounted in the middle of a refrigerant flow pipe, wherein a filter housing is provided integrally in the middle of the refrigerant flow pipe, and the filter housing is provided. A bypass passage is provided in parallel with the refrigerant main passage in the refrigerant flow pipe through the inside, and the bypass passage is provided with first and second openings that open to the refrigerant main passage. A main valve seat that partitions the refrigerant main passage is provided in the refrigerant flow pipe between the first and second openings, and the first and second openings of the bypass passage are provided in the first and second openings. Is provided,
The main valve seat and the first and second valve seats are respectively provided with valve bodies for opening and closing the main valve seat and the first and second valve seats, and are mixed with the refrigerant gas in the bypass passage. A water removal filter for adsorbing and removing the removed water, and a filter housing is provided with a joint for collecting, filling, and deaeration of the refrigerant gas in the bypass passage in communication with the bypass passage. A device for removing water mixed in the refrigerant flowing through the refrigerant flow pipe. 3. The refrigerant flow pipe according to claim 2, further comprising a water detecting means for detecting presence / absence of water in the refrigerant gas flowing in the refrigerant flow pipe at an appropriate position of the refrigerant flow pipe. A device for removing water mixed in the flowing refrigerant.