JPWO2020188750A1 - Accumulator and refrigeration cycle equipment - Google Patents

Abstract

The accumulator comprises a container and a liquid level detector that is joined through the top of the container and extends in the height direction of the container. The liquid level detection device is provided with a float that moves up and down according to the vertical movement of the liquid level of the liquid refrigerant accumulated in the container, and is arranged so as to surround the sensor unit and the sensor unit that detect the liquid level position using the float. It is equipped with a protective tube that protects the float.

Description

The present invention relates to an accumulator and a refrigeration cycle device including a liquid level detection device.

Conventionally, there is an accumulator provided with a liquid level detecting device for detecting the liquid level position of the liquid refrigerant in the container (see, for example, Patent Document 1). In Patent Document 1, the liquid level detection device is externally attached to the container. Specifically, the liquid level detection device is connected to the container by two pressure equalizing pipes, and is arranged in a pipe that reproduces the same liquid level position as in the container and above and below the liquid level of the liquid refrigerant in the pipe. It has a float that moves up and down according to the movement, and a sensor that detects the movement of the magnet provided on the float and detects the liquid level position.

In this configuration, since the liquid level detection device is externally attached to the container, the liquid level is not disturbed by the force of the gas-liquid mixed refrigerant flowing into the accumulator from the outside. Therefore, it is possible to stably detect the accurate liquid level position.

Japanese Unexamined Patent Publication No. 3-186166

However, in Patent Document 1, two pressure equalizing pipes are joined to the container, and there is a possibility of causing refrigerant leakage from the welded portion of the jointed portion of each pressure equalizing pipe.

Further, in Patent Document 1, since the liquid level detection device has a structure externally attached to the container, a wide arrangement space is required. On the other hand, if the liquid level detection device is built in the container, the problem of placement space will be improved, but the effect of the liquid level rippling due to the momentum of the gas-liquid mixed refrigerant flowing into the accumulator from the outside will be affected. A structure that does not receive is required.

The present invention is for solving the above problems, reducing the number of joints between the container and the liquid level detection device to reduce the possibility of refrigerant leakage, and suppressing the influence of the ripple of the liquid level on the liquid level. An object of the present invention is to provide an accumulator and a refrigeration cycle device capable of stably detecting a height.

The accumulator according to the present invention includes a container and a liquid level detecting device that is joined through the upper part of the container and extends in the height direction of the container, and the liquid level detecting device is a liquid of liquid refrigerant accumulated in the container. It is provided with a float that moves up and down according to the vertical movement of the surface, and is provided with a sensor unit that detects the liquid level position using the float, and a protective tube that is arranged so as to surround the sensor unit and protects the float.

According to the present invention, since the liquid level detection device has only one joint with the container, the number of joints can be reduced to a minimum, and the possibility of refrigerant leakage from the joint can be reduced. Further, since the protective tube for protecting the float is provided, it is possible to suppress the influence of the ripple of the liquid level and stably detect the liquid level.

It is a perspective view which shows the accumulator 1 which concerns on Embodiment 1. FIG. It is sectional drawing which shows the internal structure of the accumulator 1 which concerns on Embodiment 1. FIG. It is an upper enlarged view of the accumulator 1 which concerns on Embodiment 1. FIG. It is sectional drawing which shows the liquid level detection apparatus 5 of the accumulator 1 which concerns on Embodiment 1. FIG. It is operation explanatory drawing of the liquid level detection apparatus 5 of the accumulator 1 which concerns on Embodiment 1. FIG. It is a figure which shows the comparative example. It is a figure which shows the refrigerant circuit of the refrigerating cycle apparatus provided with the accumulator of Embodiment 1. FIG. It is sectional drawing of the liquid level detection apparatus 5 of the accumulator 1 which concerns on Embodiment 2. FIG. It is sectional drawing which shows the arrangement relation of each part in the sensor part 10 of the liquid level detection device 5 of the accumulator 1 which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the accumulator 1 will be described with reference to the drawings. The form of the drawing is an example, and does not limit the form of the present embodiment. In addition, those having the same reference numerals in the respective figures are the same or equivalent thereof, which are common to the entire text of the specification. Further, in the drawings below, the relationship between the sizes of the constituent members may differ from the actual one.

Embodiment 1.
[Configuration of accumulator 1]
FIG. 1 is a perspective view showing an accumulator 1 according to the first embodiment. FIG. 2 is a cross-sectional view showing the internal configuration of the accumulator 1 according to the first embodiment.

The accumulator 1 is a vertically long container 2, an inlet pipe 3 for inflowing refrigerant into the container 2, an outlet pipe 4 for flowing out the refrigerant to the outside of the container 2, and a position of the liquid level of the liquid refrigerant accumulated in the container 2. It is provided with a liquid level detecting device 5 for detecting the above.

The liquid level detection device 5 is inserted by penetrating the container 2 from the upper part into the inside, and is arranged so as to extend in the height direction of the container 2. The liquid level detection device 5 is joined to the container 2 by welding via a tube base 6. In this way, the liquid level detection device 5 is joined to the container 2 at one location in the tube base 6. The joint between the liquid level detection device 5 and the container 2 can have a likelihood at the height positions of the contact 12 and the contact 13 described later in the liquid level detection device 5, and the airtightness of the joint can be maintained. For example, joining by screwing may be used.

FIG. 3 is an enlarged upper view of the accumulator 1 according to the first embodiment, and is a detailed view showing a part of the liquid level detection device 5 cut out. FIG. 4 is a cross-sectional view showing the liquid level detection device 5 of the accumulator 1 according to the first embodiment. FIG. 5 is an operation explanatory view of the liquid level detection device 5 of the accumulator 1 according to the first embodiment.

The liquid level detection device 5 includes a sensor unit 10 that detects the liquid level position using the float 14 and a protective tube 20 that is arranged so as to surround the sensor unit 10 and protects the float 14. The sensor unit 10 is formed by extending the contact 12 and the contact 13 in the height direction of the container 2, and corresponds to the built-in pipe 11 incorporating the contact 12 and the contact 13 and the liquid level of the liquid refrigerant accumulated in the container 2. It is provided with an annular float 14 that moves up and down inside the protective tube 20.

The built-in tube 11 is made of a non-magnetic material. The built-in tube 11 penetrates the float 14 and supports the raising and lowering operation of the float 14. A magnet 15 for turning on and off the contact 12 and the contact 13 is embedded in the float 14.

The contact 12 and the contact 13 are composed of, for example, a reed switch. The contact 12 and the contact 13 are connected by a wiring 16 and are installed at different height positions in the built-in pipe 11. The contact 12 and the contact 13 are turned on by the magnet 15, and the liquid level position is detected based on the signals from the contact 12 and the contact 13. Here, the contact 12 is set for the purpose of preventing the excess liquid refrigerant accumulated in the container 2 from flowing from the container 2 into the compressor (not shown) and causing liquid compression in the compressor. It is installed at the height of the highest liquid level. The contact 13 is installed at an optimum liquid level position set for the purpose of avoiding insufficient amount of oil returned from the accumulator 1 to the compressor together with the refrigerant and causing the compressor to seize and be damaged. .. The installation position and number of contacts are not limited to this, and are arbitrary.

A feature of the first embodiment is that a protective tube 20 for protecting the sensor unit 10 is provided. Hereinafter, the protective tube 20 will be described.

The protection tube 20 is a tube formed so as to extend in the height direction of the container 2 and is located on the outer periphery of the sensor unit 10 to protect the sensor unit 10. In addition to the role of protecting the sensor unit 10, the protective tube 20 has a role of stabilizing the operation of the float 14 without becoming unstable due to the rippling liquid level in the container 2.

A pilot hole 17 and an upper hole 18 are formed in the lower portion and the upper portion of the side surface of the protective tube 20. Refrigerant flows into the inside of the protection tube 20 from the prepared hole 17, and a stable liquid level is maintained in the protection tube 20. That is, even if the liquid level 30 (see FIG. 5) is rippling in the container 2, a stable liquid level 19 (see FIG. 5) is maintained in the protective tube 20. The upper hole 18 is provided for venting gas. The refrigerant gasified in the protective pipe 20 is discharged from the upper hole 18 to the outside of the protective pipe 20. The dimensions of the prepared hole 17 and the upper hole 18 are arbitrary diameters depending on the inflow amount of the refrigerant.

The lower end portion and the upper end portion of the protective tube 20 are a lower throttle portion 21 and an upper throttle portion 22 having a narrowed inner diameter. The lower throttle portion 21 is used as a space in which suspended matter accumulated in the protective tube 20 can be stored. By accumulating the deposited foreign matter 23 in this space, it is possible to prevent the float 14 from being caught by the deposited foreign matter 23. The height position of the prepared hole 17 is set in consideration of the amount of accumulated foreign matter 23 accumulated in the lower throttle portion 21 of the protective tube 20. Specifically, the height position of the prepared hole 17 is set so that the volume in the protective tube 20 below the prepared hole 17 is equal to or larger than the expected volume of the deposited foreign matter 23. This prevents the pilot hole 17 from being blocked by the deposited foreign matter 23.

The protective tube 20 is supported by the upper throttle portion 22 and the lower throttle portion 21 at both upper and lower ends of the built-in tube 11. Specifically, the upper throttle portion 22 supports the upper end portion 11b of the built-in pipe 11 by welding, and the lower throttle portion 21 supports the lower end portion 11a of the built-in pipe 11 via the gap 21a. The joining between the upper throttle portion 22 of the protective tube 20 and the upper end portion of the built-in tube 11 is not limited to welding, and the contact 12 and the contact 13 of the sensor portion 10 can have a likelihood and airtightness can be improved. If it can be maintained, it may be joined by screwing.

In the liquid level detecting device 5 configured as described above, the float 14 of the sensor unit 10 floats on the liquid level 19 in the protective tube 20 as shown in FIG. 5, and the liquid level 19 rises 31 and falls. The float 14 also moves up and down following 32. When the float 14 reaches the position of the contact 12 or the contact 13, the contact at the height position of the float 14 is turned on by the magnet 15 embedded in the float 14, while the contact at a position different from the height position of the float 14. Is turned off. The liquid level position is detected based on the signal of the turned-on contact.

Here, the operation of the protective tube 20 will be described. First, as a comparative example, a configuration without the protective tube 20 will be described.

FIG. 6 is a diagram showing a comparative example.
As shown in FIG. 6, when the protective tube 20 is not provided, the liquid level 30 undulates due to the force of the gas-liquid mixed refrigerant flowing into the container 2 from the outside, and the float 14 moves up and down to obtain an accurate position of the liquid level 30. Cannot be detected. Further, when the float 14 is at the height position of the contact (not shown), the float 14 moves up and down under the influence of the rippling of the liquid surface 30, so that the contact is repeatedly turned on and off. Therefore, there are inconveniences such as contact failure.

On the other hand, in the first embodiment, since the protective tube 20 for protecting the sensor unit 10 is provided, the float 14 of the sensor unit 10 is not directly affected by the undulating refrigerant in the container 2, and is a protective tube. It floats on the stable liquid level 19 in 20, and the liquid level position can be accurately detected.

Further, in the comparative example shown in FIG. 6, the upper end portion 11b of the built-in pipe 11 having a built-in contact is joined to and fixed to the container 2, but the lower end portion 11a is a free end. Therefore, due to the undulation of the liquid level 30, the built-in pipe 11 may vibrate with the joint portion of the upper end portion 11b as a fulcrum, and the joint portion may be broken.

On the other hand, in the first embodiment, the protective tube 20 joins and supports the upper end portion 11b of the built-in tube 11 with the upper throttle portion 22, while the lower end portion 11a of the built-in pipe 11 is joined and supported by the lower throttle portion 21 with the gap 21a. Support through. Therefore, even if the built-in tube 11 portion protruding downward from the lower throttle portion 21 vibrates under the force of the liquid surface rippling in the container 2, the vibration width is limited to the width of the gap 21a. The vibration width can be reduced. As a result, vibration of the joint portion of the upper end portion 11b of the built-in pipe 11 can be alleviated, and breakage of the joint portion can be prevented. The gap 21a is, for example, 0.05 mm to 0.35 mm in the first embodiment. However, the gap 21a may be determined in consideration of the vibration level, assembly workability, and workability, and is not limited to the above range.

The accumulator 1 of the first embodiment configured as described above constitutes a refrigeration cycle apparatus as shown in FIG. 7 below.

FIG. 7 is a diagram showing a refrigerant circuit of the refrigeration cycle apparatus provided with the accumulator of the first embodiment.
The refrigeration cycle device 60 includes an accumulator 1, a compressor 61, a condenser 62, a pressure reducing device 63 composed of an expansion valve and the like, and an evaporator 64.

Hereinafter, an example of the operation of the refrigerant circuit, the operation of the liquid level detection device 5 and the control of the compressor 61 along with the operation will be described.

In the refrigerant circuit, when the compressor 61 is driven, the refrigerant flows in the order of the condenser 62, the decompression device 63, the evaporator 64, and the accumulator 1, and repeats the cycle of returning to the compressor 61. When the compressor 61 rotates at high speed, a large amount of refrigerant flows in the refrigerant circuit, and the refrigerant starts to temporarily stay in the accumulator 1.

When the liquid refrigerant starts to accumulate in the accumulator 1 in this cycle, the float 14 rises according to the liquid level position of the liquid refrigerant. As a result, the upper contact 12 is turned on by the magnet 15 embedded in the float 14, and the position of the liquid surface is detected based on the signal from the contact 12.

Here, the contact 12 is arranged at the height position of the highest liquid level as described above. Therefore, when the contact 12 is turned on, the liquid level 19 is lowered by controlling the compressor 61 from high-speed rotation to low-speed rotation. As a result, it is possible to prevent the liquid refrigerant from excessively flowing into the compressor 61 and damaging the compressor 61 due to liquid compression.

Further, the contact 13 is arranged at the height position of the lowest liquid level as described above. Therefore, when the liquid level 19 is lowered and the contact 13 is turned on, the liquid level of the accumulator 1 is raised by controlling the compressor 61 from low-speed rotation to high-speed rotation. This makes it possible to prevent damage due to seizure of the compressor due to insufficient oil return.

In this way, when the contact 12 and the contact 13 are provided on the highest liquid level and the lowest liquid level, the liquid level detection result is applied to the control of the compressor 61 to prevent damage to the compressor 61. Is possible.

[effect]
As described above, the first embodiment includes the container 2 and the liquid level detecting device 5 which is joined through the upper part of the container 2 and extends in the height direction of the container 2. The liquid level detection device 5 includes a float 14 that moves up and down according to the vertical movement of the liquid level of the liquid refrigerant accumulated in the container 2, and has a sensor unit 10 that detects the liquid level position using the float 14 and a sensor unit 10. It is provided with a protective tube 20 which is arranged so as to surround the float 14 and protects the float 14.

As described above, since the liquid level detection device 5 and the container 2 have only one joint, the number of joints can be minimized as compared with the conventional configuration in which two are required. Therefore, the leakage of the refrigerant from the joint can be minimized. As described above, the liquid level detection device 5 and the container 2 may be joined by welding or screwing, and if the liquid level detecting device 5 is screwed in, the sensor unit 10 of the liquid level detecting device 5 may be replaced if it fails. It's easy to do.

In the first embodiment, since the protective tube 20 for protecting the sensor unit 10 is provided, it is possible to prevent the float 14 of the sensor unit 10 from being directly affected by the undulating refrigerant in the accumulator 1, and the float 14 can be prevented from being directly affected by the refrigerant. The lifting operation can be stabilized. As a result, the liquid level position can be accurately detected.

In the first embodiment, the sensor unit 10 is a magnet 15 embedded in the float 14, a contact point that is turned on and off by the magnet 15, and a tube that penetrates the annular float 14 and extends in the height direction of the container 2. It includes a contact 12 and a built-in tube 11 containing the contact 13. The protective tube 20 has an upper throttle portion 22 and a lower throttle portion 21 whose inner diameters are narrowed at both upper and lower ends, and the upper and lower throttle portions 22 and the lower throttle portion 21 support the upper and lower ends of the built-in tube 11. ..

In this way, since the protective tube 20 supports the upper and lower end portions of the built-in tube 11 by the upper throttle portion 22 and the lower throttle portion 21, the lower end portion 11a of the built-in tube 11 is not supported and is a free end. Compared with the structure described above, the vibration of the built-in tube 11 can be suppressed. Therefore, it is possible to suppress a problem that the built-in pipe 11 vibrates during transportation or due to the ripple of the refrigerant in the accumulator 1 and leads to breakage. Further, the lower throttle portion 21 is used as a space where the accumulated foreign matter 23 accumulated in the protective tube 20 can be stored. By accumulating the deposited foreign matter 23 in this space, it is possible to prevent the float 14 from being caught by the deposited foreign matter 23.

In the first embodiment, the protective tube 20 has a pilot hole 17 for receiving the liquid refrigerant collected in the container 2 into the protective tube 20, and an upper hole 18 for venting gas from the inside to the outside of the protective tube 20. It is formed.

As a result, the liquid refrigerant flows into the protective tube 20 from the prepared hole 17, while the gas filled in the protective tube 20 is released from the upper hole 18. Due to the effect of these two holes, a stable refrigerant height can be detected.

Further, in the first embodiment, the height position of the prepared hole 17 is such that the volume in the protective tube 20 below the prepared hole 17 is equal to or larger than the volume of the deposited foreign matter 23 which is assumed to be deposited in the protective tube 20. It is set to be a volume.

As a result, it is possible to prevent the prepared hole 17 from being blocked by the deposited foreign matter 23.

In the first embodiment, the accumulator 1 constitutes a refrigeration cycle device 60 together with a compressor 61, a condenser 62, a decompression device 63, and an evaporator 64. The refrigerating cycle device 60 can be applied to an air conditioner, a refrigerator freezer, or the like.

Embodiment 2.
The second embodiment has a structure capable of confirming the soundness of the liquid level detection device 5. The basic configuration of the accumulator 1 of the second embodiment is the same as that of the first embodiment, and the second embodiment will be described below with a focus on the additional structure from the first embodiment.

At the time of shipment of the accumulator 1, the soundness of the liquid level detection device 5 is confirmed. Specifically, the soundness of the detection operation such as whether the contact 12 and the contact 13 are turned on by the magnet 15 and the soundness of the installation position such as whether the installation positions of the contact 12 and the contact 13 are correct are confirmed. The second embodiment relates to a technique suitable for confirming the soundness of these. Hereinafter, a specific description will be given.

[Configuration of liquid level detection device 5]
FIG. 8 is a cross-sectional view of the liquid level detection device 5 of the accumulator 1 according to the second embodiment. FIG. 9 is a cross-sectional view showing the arrangement relationship of each part in the sensor part 10 of the liquid level detection device 5 of the accumulator 1 according to the second embodiment.
In the second embodiment, the configuration of the liquid level detection device 5 is different from that in the first embodiment. The liquid level detection device 5 of the second embodiment is a pipe that penetrates the float 14 and extends in the height direction of the container 2, and includes a detection rod insertion pipe 40 that includes the built-in pipe 11. The detection rod insertion tube 40 forms a space 42 for inserting the detection rod 41 between the detection rod insertion tube 40 and the built-in tube 11 contained in the detection rod insertion tube 40. A magnet 43 is attached to the tip of the detection rod 41 in the insertion direction, that is, the lower end. Other structures are the same as those in the first embodiment.

(Confirmation of detection operation)
If the contact detection operation is confirmed without using the detection rod 41, the float 14 is moved to each position of each contact 12 and 13 to confirm whether or not the contact is turned on. In order to move the float 14 to the respective positions of the contact 12 and the contact 13, a method of turning over the container 2 together can be considered. However, when the accumulator 1 is a heavy object, it becomes a heavy work, it is difficult to ensure safety, and in reality, it is difficult to detect and confirm it.

On the other hand, in the second embodiment, the detection rod 41 can be inserted through the upper end opening 40a of the detection rod insertion tube 40 to confirm the detection of the contact 12 and the contact 13. That is, when the magnet 43 attached to the lower end of the detection rod 41 reaches the height positions of the contact 12 and the contact 13, each of the contact 12 and the contact 13 is turned on by the magnet 43. According to this method, the soundness of the operation of the contact 12 and the contact 13 can be confirmed without turning over the accumulator 1. It is preferable that such an operation check can be performed not only at the time of shipment but also after the product is installed, but in the second embodiment, the detection rod 41 is simply inserted into the detection rod insertion tube 40 at either timing. You can.

(Confirmation of installation position)
In order to confirm the installation positions of the contact 12 and the contact 13, the detection rod 41 is marked in advance. That is, the detection rod 41 is inserted into the detection rod insertion tube 40, and the detection rod 41 is provided with a mark in a state where the magnet 43 reaches the regular height position of the contact 12. The same applies to the contact 13. Then, when the detection rod 41 is inserted into the detection rod insertion tube 40 and inserted to the position where the mark is located, if the corresponding contact is activated, it can be determined that the installation height of the contact is correct. The installation position can be confirmed by simply inserting the detection rod 41 into the detection rod insertion tube 40 at both the time of shipment and the timing after the product is installed.

[effect]
As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained, and the following effects can be obtained. That is, the second embodiment is a tube that penetrates the float 14 and extends in the height direction of the container 2, and includes a detection rod insertion tube 40 that includes the built-in tube 11. The detection rod insertion tube 40 forms a space 42 for inserting the detection rod 41 between the detection rod insertion tube 40 and the built-in tube 11 contained in the detection rod insertion tube 40.

Thereby, the operation of the contact 12 and the contact 13 can be confirmed only by inserting the detection rod 41 provided with the magnet 43 into the detection rod insertion tube 40. Therefore, the work of turning over the accumulator 1 is unnecessary, the simplicity of the confirmation work can be improved, and the detection accuracy can be improved. Then, these confirmations can be performed both at the time of shipment of the product and after the product is installed. Therefore, if a failure of the contact 12 and the contact 13 is suspected after the product is installed, the presence or absence of the failure can be easily confirmed.

The accumulator 1 of the second embodiment can be applied to the refrigeration cycle device 60 of FIG. 7 as in the first embodiment.

According to the second embodiment, the most necessary improvement of the accuracy of confirming the installation height position of the liquid level detection device 5 with respect to the container 2 and the simplification of the operation of confirming the soundness of the contacts at the time of shipment of the product and after the product is installed. It is possible to improve the sex.

Although the first and second embodiments have been described above, the description is not limited to the description of each embodiment. For example, it is possible to implement all or part of each embodiment.

1 Accumulator, 2 Containers, 3 Inlet Piping, 4 Outlet Piping, 5 Liquid Level Detection Device, 6 Tube Base, 10 Sensors, 11 Built-in Pipes, 11a Lower Bottom, 11b Upper Top, 12 Contact, 13 Contact, 14 Float, 15 Magnet, 16 wiring, 17 pilot hole, 18 upper hole, 19 liquid level, 20 protective tube, 21 lower throttle part, 21a gap, 22 upper throttle part, 23 deposited foreign matter, 30 liquid level, 31 rise, 32 fall, 40 Detection rod insertion tube, 40a top opening, 41 Detection rod, 42 space, 43 magnets, 60 refrigeration cycle device, 61 compressor, 62 condenser, 63 decompression device, 64 evaporator.

The accumulator according to the present invention includes a container and a liquid level detecting device that is joined through the upper part of the container and extends in the height direction of the container, and the liquid level detecting device is a liquid of liquid refrigerant accumulated in the container. It is equipped with a float that moves up and down according to the vertical movement of the surface, and is equipped with a sensor unit that detects the liquid level position using the float and a protective tube that is arranged around the sensor unit and protects the float . The sensor unit is a float. It is equipped with a magnet embedded in the container, a contact that is turned on and off by the magnet, and a built-in tube that penetrates the annular float and extends in the height direction of the container and has a built-in contact. It has an upper squeezing portion and a lower squeezing portion having a narrowed inner diameter, and the upper and lower squeezing portions support the upper and lower ends of the built-in tube .

Claims (6)

With the container
It is provided with a liquid level detection device that is joined through the upper part of the container and extends in the height direction of the container.
The liquid level detection device is
A sensor unit that includes a float that moves up and down according to the vertical movement of the liquid level of the liquid refrigerant accumulated in the container and detects the position of the liquid level using the float.
An accumulator provided with a protective tube arranged around the sensor unit to protect the float. The sensor unit
The magnet embedded in the float and
The contacts that are turned on and off by the magnet,
A tube that penetrates the annular float and extends in the height direction of the container, and includes a built-in tube that incorporates the contact.
The protective tube has an upper throttle portion and a lower throttle portion whose inner diameters are narrowed at both upper and lower ends, and the upper and lower throttle portions support the upper and lower ends of the built-in tube by the upper throttle portion and the lower throttle portion. Item 1. The accumulator according to item 1. 1. Item 2. The accumulator according to item 2. The height position of the prepared hole is set so that the volume in the protective tube below the prepared hole is equal to or larger than the volume of the deposited foreign matter expected to be accumulated in the protective tube. 3. The accumulator according to the description. A tube that penetrates the float and extends in the height direction of the container, and includes a detection rod insertion tube that includes the built-in tube.
3. The accumulator described. A refrigeration cycle apparatus including the accumulator according to any one of claims 1 to 5, a compressor, a condenser, a decompression device, and an evaporator.

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