JP2021032514A - Throttle device and refrigeration cycle system - Google Patents

Abstract

To provide a throttle device that can stabilize an amount of liquid component to be supplied to a throttle part, and to provide a refrigeration cycle system including the throttle device.SOLUTION: Exchanging heat between a refrigerant residence part A1 and a low-pressure refrigerant passing part A3 can cool the refrigerant residence part A1, accordingly a gas component of the refrigerant in the refrigerant residence part A1 is condensed and facilitated converting into a liquid component and the liquid component can be stably supplied to a throttle part 311; thus, performance of a throttle device 10A can be stabilized.SELECTED DRAWING: Figure 2

Description

The present invention relates to a squeezing device and a refrigeration cycle system including the squeezing device.

Conventionally, a fluid distributor which is provided in a refrigeration cycle device such as an air conditioner and distributes an inflowing gas-liquid two-phase refrigerant at a predetermined ratio has been proposed (see, for example, Patent Document 1). In the fluid distributor described in Patent Document 1, one inflow portion and three outflow portions are provided, and the valve body is attached to the valve body mounting hole to adjust the amount of fluid flowing out from the outflow portion. It has become so.

Japanese Unexamined Patent Publication No. 2010-223445

However, when the fluid distributor described in Patent Document 1 is provided in the refrigeration cycle system, if the outside air temperature is high or a heating element is present in the vicinity, the condensation becomes insufficient due to insufficient heat exchange of the condenser, etc. The proportion of gas components in the phase refrigerant was sometimes high. At this time, even if the volume ratio of the distributed refrigerant is kept constant, if the gas-liquid ratio of the distributed refrigerant is different from each other, the balance of the actual amount (material amount) of the refrigerant changes, which is desired. Sometimes the cooling capacity could not be obtained.

Such fluctuations in the gas-liquid ratio can occur not only in the fluid distributor but also in the throttle device that expands the refrigerant. That is, if the proportion of the gas component of the refrigerant increases due to the outside air temperature or the like, the amount of the liquid component supplied to the throttle portion may decrease. Further, such an inconvenience may occur in a drawing device that expands and distributes the refrigerant, or a drawing device that simply expands and does not distribute the refrigerant.

An object of the present invention is to provide a drawing device capable of stabilizing the amount of liquid components supplied to the drawing section, and a refrigeration cycle system provided with the drawing device.

In the throttle device of the present invention, a refrigerant retention that is formed between a primary port that receives a high-pressure refrigerant, a throttle portion that allows the refrigerant that has flowed in from the primary port to pass through, and the primary port and the throttle portion, and the refrigerant stays there. Between the unit, the secondary port that sends out the refrigerant that has passed through the throttle portion, the low-pressure refrigerant passage portion through which the refrigerant passes from the throttle portion to the secondary port, and the refrigerant retention portion and the low-pressure refrigerant passage portion. It is characterized by comprising a heat exchange means for heat exchange.

According to the present invention as described above, since the heat exchange means for heat exchange between the refrigerant retention portion and the low-pressure refrigerant passage portion is provided, the refrigerant retention portion is cooled by the refrigerant that has passed through the throttle portion. Can be done. As a result, the gas component of the refrigerant in the refrigerant retention portion can be easily condensed into a liquid component, and the amount of the liquid component supplied to the throttle portion can be stabilized.

At this time, it is preferable that the throttle device of the present invention further includes a liquid storage unit that stores the liquid component of the refrigerant staying in the refrigerant retention unit and supplies the liquid component to the throttle unit. According to such a configuration, the liquid component obtained by condensing the gas component of the refrigerant can be stored in the liquid storage section, and the amount of the liquid component supplied to the throttle section can be stabilized.

Further, the throttle device of the present invention is provided with a plurality of each of the throttle portion and the secondary port, and the liquid storage portion is commonly provided for the plurality of the throttle portions, and the refrigerant received from the primary port is received. It is preferable to distribute to the plurality of secondary ports. According to such a configuration, since the liquid component can be easily stored in the liquid storage portion as described above, the liquid component can be stably supplied to the plurality of throttle portions. Therefore, it is possible to easily distribute the refrigerant to the plurality of secondary ports at a predetermined ratio.

Further, in the drawing device of the present invention, it is preferable that the heat exchange means is provided on the wall portion surrounding the refrigerant retention portion and has an uneven portion on the surface on the refrigerant retention portion side. According to such a configuration, it is possible to increase the surface area of the heat exchange surface in the refrigerant retention portion and improve the heat exchange efficiency.

Further, in the drawing device of the present invention, the heat exchange means may have a heat transfer member that is arranged in the refrigerant retaining portion and allows the refrigerant to pass through. According to such a configuration, the heat exchange efficiency can be improved in the refrigerant retention portion.

At this time, in the drawing device of the present invention, it is preferable that the heat transfer member is made of a porous body or a mesh member. According to such a configuration, the surface area of the heat transfer member can be increased to improve the heat exchange efficiency.

At this time, in the drawing device of the present invention, it is preferable that the heat transfer member is provided from the refrigerant retention portion to the liquid storage portion. According to such a configuration, the liquid condensed on the surface and inside of the heat transfer member can be easily introduced into the liquid storage portion.

Further, in the drawing device of the present invention, the heat exchange means is provided on a wall portion surrounding the refrigerant retention portion, and a groove portion extending toward the liquid storage portion is provided on the surface of the wall portion on the refrigerant retention portion side. May be formed. According to such a configuration, the liquid condensed on the surface of the wall portion can be easily introduced into the liquid storage portion.

Further, in the drawing device of the present invention, the heat exchange means is provided on the wall portion surrounding the refrigerant retention portion, and even if the surface of the wall portion on the refrigerant retention portion side is subjected to water repellent treatment. Good. According to such a configuration, the condensed liquid can easily flow on the surface of the wall portion and can be easily introduced into the liquid storage portion.

Further, in the throttle device of the present invention, it is preferable that the primary port is opened on the upper side in the vertical direction and the liquid storage portion is arranged so as to be arranged on the lower side of the refrigerant retention portion. According to such a configuration, the liquid condensed in the refrigerant retention portion can be directed downward by gravity, and can be easily introduced into the liquid storage portion.

Further, in the drawing device of the present invention, the primary port is further provided with a refrigerant introduction cylinder that opens downward in the vertical direction and extends upward from the primary port, and has a space above the refrigerant introduction cylinder. , The space on the outer side in the radial direction of the upper portion of the cylinder may be the refrigerant retention portion, and the space on the lower side including the lower portion of the cylinder of the refrigerant introduction cylinder may be the liquid storage portion. According to such a configuration, the refrigerant can be introduced from the lower side to the drawing device, and the liquid component of the refrigerant that has progressed toward the upper side can be lowered and introduced into the liquid storage unit.

The refrigeration cycle system of the present invention evaporates a compressor for compressing a refrigerant, a condenser for condensing the compressed refrigerant, a drawing device according to any one of the above for expanding and depressurizing the condensed refrigerant, and a decompressed refrigerant. It is characterized by comprising one or a plurality of evaporators. According to the present invention as described above, by stabilizing the performance of the throttle device as described above, the cooling performance of the evaporator can be stabilized.

According to the drawing device and the refrigerating cycle system of the present invention, the amount of the liquid component supplied to the drawing part can be stabilized by exchanging heat between the refrigerant retention part and the low-pressure refrigerant passing part.

It is a system diagram which shows the refrigeration cycle system which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the drawing device provided in the refrigerating cycle system. It is sectional drawing which shows the drawing apparatus provided in the refrigerating cycle system which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the drawing apparatus provided in the refrigerating cycle system which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the drawing apparatus provided in the refrigerating cycle system which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the drawing apparatus provided in the refrigerating cycle system which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the drawing apparatus provided in the refrigerating cycle system which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the drawing device which concerns on a modification.

Each embodiment of the present invention will be described with reference to the drawings. In the second to sixth embodiments, the same components as those described in the first embodiment and the components having the same functions are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[First Embodiment]
As shown in FIG. 1, the refrigeration cycle system 100A of the present embodiment includes a throttle device 10A that expands and depressurizes the refrigerant (fluid), a compressor 11 that compresses the refrigerant, and a condenser 12 that condenses the refrigerant. An evaporator 13 for evaporating the refrigerant is provided. This refrigeration cycle system 100A is used in, for example, refrigerators, freezers, air conditioners, and the like. Further, in the present embodiment, the vertical direction is the Z direction, and the two directions along the horizontal plane and orthogonal to each other are the X direction and the Y direction.

As shown in FIG. 2, the drawing device 10A is a device having one housing 2 and two drawing units 3A and 3B, and expands and distributes the refrigerant. The number of diaphragm units provided in the diaphragm device and the number of secondary ports described later may be 3 or more as long as they correspond to the number of evaporators.

The housing 2 is formed entirely of a metal member into a cylindrical shape, and has a primary port 21 that opens upward in the Z direction, a secondary port 22 that opens on both sides in the X direction, and a housing 2 that opens upward in the Z direction. It has two housing units 23 and.

The primary port 21 is formed in the central portion of the top surface of the housing 2, and a cylindrical accommodating portion 23 is formed at a position sandwiching the primary port 21 from the X direction. The inside of each accommodating portion 23 and the secondary port 22 communicate with each other.

The housing 2 has a partition wall 24 that partitions the space below the primary port 21 and the accommodating portion 23. The partition wall 24 does not reach the bottom surface of the housing 2, and a gap is formed between them. Of the internal space of the housing 2, the space surrounded by the partition wall 24 becomes the refrigerant retention portion A1, and the space on the lower side including the tip portion of the partition wall 24 becomes the liquid storage portion A2. The inner surface of the partition wall 24 (the surface on the side of the refrigerant retention portion A1) is subjected to a water repellent treatment such as a fluororesin coating. The liquid storage portion A2 can supply a liquid component to both of the two throttle portions 311 described later, and is provided in common with the two throttle portions 311.

The diaphragm units 3A and 3B are formed of a metal member and are formed in a cylindrical shape with both ends closed, and have a through-hole-shaped diaphragm portion 311 on the bottom surface portion 31 and an opening portion 321 on the side surface portion 32. When the aperture units 3A and 3B are accommodated in the accommodating portion 23, the side surface portion 32 overlaps the partition wall 24, and the opening 321 and the secondary port 22 communicate with each other. The refrigerant that has passed through the throttle portion 311 is directed toward the secondary port 22, and the space inside the cylindrical throttle units 3A and 3B becomes the low-pressure refrigerant passage portion A3. The low-pressure refrigerant passing portion A3 communicates with the liquid storage portion A2 via the throttle portion 311. The lower end portion of the partition wall 24 and the bottom surface portion 31 are arranged at substantially the same height in the Z direction. In the present embodiment, the inner diameters of the drawing portions 311 of the drawing units 3A and 3B are substantially equal to each other, and the refrigerant is evenly distributed to the two secondary ports 22, but the distribution ratio is appropriately set. The inner diameter of the valve port may be as large as the distribution ratio.

The refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3 are arranged side by side in the X direction, and a partition wall 24 and a side surface portion 32 are provided between them. The housing 2 and the drawing units 3A and 3B are made of metal members having high thermal conductivity, and the partition wall 24 and the side surface portion 32 are heat exchange means for exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3. Functions as.

Here, the flow of the refrigerant in the drawing device 10A will be described. First, the throttle device 10A receives the refrigerant from the primary port 21, and this refrigerant is introduced into the refrigerant retention portion A1. Of the introduced refrigerant, the liquid component moves downward in the Z direction and is stored in the liquid storage section A2, and the gas component stays in the refrigerant retention section A1.

The liquid component stored in the liquid storage section A2 is supplied to the throttle section 311 and passes through the throttle section 311 to reduce the pressure and lower the temperature, and is sent out from the secondary port 22 to the evaporator 13. At this time, the low-pressure refrigerant passage portion A3, which is the flow path of the refrigerant that has passed through the throttle portion 311, is cooled by the refrigerant and becomes lower in temperature than the refrigerant retention portion A1. As a result, the heat of the refrigerant retention portion A1 is transferred to the low-pressure refrigerant passage portion A3 via the partition wall 24 and the side surface portion 32, and the refrigerant (gas component) of the refrigerant retention portion A1 is cooled.

A part of the cooled refrigerant in the refrigerant retention portion A1 is condensed into a liquid component, which is introduced into the liquid storage portion A2. In particular, the liquid component condensed on the surface of the partition wall 24 descends as droplets 28 along the partition wall 24 and is introduced into the liquid storage portion A2.

According to the above embodiment, the refrigerant retention portion A1 can be cooled by exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3. As a result, the gas component of the refrigerant in the refrigerant retention portion A1 can be easily condensed into a liquid component, and the amount of the liquid component supplied to the throttle portion 311 can be stabilized.

Further, the drawing device 10A includes a liquid storage section A2 that stores the liquid component of the refrigerant staying in the refrigerant staying section A1 and supplies the liquid component to the drawing section 311 so that the liquid component obtained by condensing the gas component of the refrigerant is liquid. It can be stored in the storage unit A2, and the amount of the liquid component supplied to the throttle unit 311 can be stabilized.

Further, two secondary ports 22 are provided for one primary port 21, and a liquid storage unit A2 is provided in common for the two throttle units 311. As described above, the liquid storage unit A2 is provided. Since the liquid component can be easily stored, the liquid can be stably supplied to the two drawing portions 311. Therefore, the difference in the amount of substance of the refrigerant passing through each throttle portion 311 can be reduced, and the refrigerant can be easily distributed to the two secondary ports 22 at a predetermined ratio (1: 1 in the present embodiment). ..

Further, since the partition wall 24, which is a wall portion surrounding the refrigerant retention portion A1, is water-repellent, the condensed liquid droplets 28 on the inner surface of the partition wall 24 can easily flow and are introduced into the liquid storage portion A2. Can be made easier.

Further, since the liquid storage portion A2 is arranged so as to be arranged below the refrigerant retention portion A1, the liquid condensed in the refrigerant retention portion A1 is directed downward by gravity, which facilitates introduction into the liquid storage portion A2. be able to.

[Second Embodiment]
The refrigeration cycle system of the present embodiment includes a drawing device 10B as shown in FIG. The drawing device 10B of the present embodiment is different from the drawing device 10A of the first embodiment in that an uneven portion 24A is formed on the inner surface of the partition wall 24. The uneven portion 24A may be formed on the entire inner surface of the partition wall 24 (the entire circumferential direction when viewed from the Z direction), or only the portion of the inner surface of the partition wall 24 adjacent to the low-pressure refrigerant passing portion A3 (Z direction). It may be formed in a part in the circumferential direction when viewed from the viewpoint. Further, the convex portion constituting the concave-convex portion 24A may be point-shaped, may extend along the circumferential direction, or may extend along the Z direction. Further, the uneven portion may be a fine uneven portion formed by roughening the inner surface of the partition wall 24 by sandblasting or the like, or may be formed by performing dimple processing on the inner surface of the partition wall 24. May be good.

According to the above embodiment, the performance of the drawing device 10B can be stabilized by exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3, as in the first embodiment of the previous term. .. Further, since the uneven portion 24A is formed on the inner surface of the partition wall 24, the surface area of the heat exchange surface in the refrigerant retention portion A1 can be increased and the heat exchange efficiency can be improved.

[Third Embodiment]
The refrigeration cycle system of the present embodiment includes a drawing device 10C as shown in FIG. The drawing device 10C of the present embodiment is different from the drawing device 10A of the first embodiment in that a heat transfer member 4 is provided.

The heat transfer member 4 is formed of a columnar mesh member, is arranged so as to be filled in the refrigerant retention portion A1, and functions as a heat exchange means together with the partition wall 24 and the side surface portion 32. That is, heat is transferred between the partition wall 24 and the heat transfer member 4, and the refrigerant that has passed through the inside of the heat transfer member 4 is cooled. The lower end of the heat transfer member 4 does not reach the liquid storage portion A2.

According to the above embodiment, the performance of the drawing device 10C can be stabilized by exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3, as in the first embodiment of the previous term. .. Further, by providing the heat transfer member 4, the heat exchange efficiency can be improved in the refrigerant retention portion A1. Further, since the heat transfer member 4 is composed of the mesh member, the surface area can be increased and the heat exchange efficiency can be improved.

[Fourth Embodiment]
The refrigeration cycle system of the present embodiment includes a drawing device 10D as shown in FIG. The drawing device 10D of the present embodiment is different from the drawing device 10C of the third embodiment in that a heat transfer member 5 is provided instead of the heat transfer member 4.

The heat transfer member 5 is formed of a columnar mesh member, is arranged so as to be filled in the refrigerant retention portion A1, and functions as a heat exchange means together with the partition wall 24 and the side surface portion 32. That is, heat is transferred between the partition wall 24 and the heat transfer member 5, and the refrigerant that has passed through the inside of the heat transfer member 5 is cooled. A part of the lower end of the heat transfer member 5 reaches the liquid storage section A2, and the heat transfer member 5 is provided from the refrigerant retention section A1 to the liquid storage section A2.

According to the above embodiment, the performance of the drawing device 10D can be stabilized by exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3, as in the first embodiment of the previous term. .. Further, by providing the heat transfer member 5, the heat exchange efficiency can be improved in the refrigerant retention portion A1. Further, since the heat transfer member 5 is composed of a mesh member, the surface area can be increased and the heat exchange efficiency can be improved.

Further, since the heat transfer member 5 is provided from the refrigerant retention portion A1 to the liquid storage portion A2, the liquid condensed on the surface and inside of the heat transfer member 5 can be easily introduced into the liquid storage portion A2. it can. The surface of the heat transfer member 5 is a portion corresponding to the surface of the cylinder, and the inside of the heat transfer member 5 is a portion corresponding to the inside of the cylinder (a portion through which the refrigerant passes).

[Fifth Embodiment]
The refrigeration cycle system of the present embodiment includes a drawing device 10E as shown in FIG. The drawing device 10E of the present embodiment is different from the drawing device 10A of the first embodiment in that a groove portion 24B is formed on the inner surface of the partition wall 24.

The groove portion 24B extends along the Z direction and is formed from the refrigerant retention portion A1 to the liquid storage portion A2, that is, extends from the refrigerant retention portion A1 toward the liquid storage portion A2. In the illustrated example, the groove portion 24B is formed on the back side (the portion of the partition wall 24 that is not adjacent to the low-pressure refrigerant passing portion A3), but the groove portion is formed in the portion of the partition wall 24 that is adjacent to the low-pressure refrigerant passing portion A3. It may have been done.

According to the above embodiment, the performance of the drawing device 10E can be stabilized by exchanging heat between the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3, as in the first embodiment of the previous term. .. Further, since the groove portion 24B is formed on the inner surface of the partition wall 24, it is possible to easily introduce the liquid droplet 28 condensed on the inner surface of the partition wall 24 into the liquid storage portion.

[Sixth Embodiment]
The refrigeration cycle system of the present embodiment includes a drawing device 10F as shown in FIG. In the throttle device 10F of the present embodiment, the housing 2F has a primary port 25 opened downward in the Z direction and a refrigerant introduction cylinder 26 extending upward from the primary port 25 with respect to the throttle device 10A of the first embodiment. And, the difference is that it has.

In the present embodiment, the space inside the partition wall 24 and above the refrigerant introduction cylinder 26 in the housing 2F, and the inside of the partition wall 24 and the upper portion of the refrigerant introduction cylinder 26 (bottom portions 31 of the drawing units 3A and 3B). The space outside the radial direction of 26A (the portion located above in the Z direction) is the refrigerant retention space A4. Further, in the radial outer space of the refrigerant introduction cylinder 26, the space on the lower side including the cylinder lower side portion 26B becomes the liquid storage portion A5.

The refrigerant introduced into the refrigerant retention portion A4 from the primary port 25 collides with the top surface portion 27 of the housing 2 by going upward, and the liquid component is introduced into the liquid storage portion A5 by going outward in the radial direction. At this time, as in the first embodiment, heat is exchanged between the refrigerant retention portion A4 and the low-pressure refrigerant passage portion A3 by the partition wall 24 and the side surface portion 32 as heat exchange means.

According to the above embodiment, the performance of the drawing device 10F can be stabilized by exchanging heat between the refrigerant retention portion A4 and the low-pressure refrigerant passage portion A3, as in the first embodiment of the previous term. .. Further, the refrigerant can be introduced into the throttle device 10F from the lower side, and the liquid component of the refrigerant that has progressed toward the upper side can be lowered and introduced into the liquid storage unit A5.

The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. For example, in the first embodiment, two secondary ports 22 are provided for one primary port 21 to distribute the refrigerant, but a throttle device that does not distribute the refrigerant may be used. That is, as in the diaphragm device 10G illustrated in FIG. 8, a configuration may be configured in which one diaphragm unit 3A is provided and only one housing portion 23 is formed in the housing 2G.

Further, the characteristic portions (concavo-convex portion 24A, heat transfer members 4, 5 and groove portion 24B) in the second to fifth embodiments may be appropriately combined, and the primary port 25 is downward as in the sixth embodiment. In the configuration opened to the side, the characteristic portions in the second to fifth embodiments may be appropriately adopted.

Further, although the heat transfer members 4 and 5 are made of mesh members in the third and fourth embodiments, the heat transfer members may be any as long as the refrigerant can pass through, for example, a porous body. It may be composed of.

Further, in the first embodiment, it is assumed that the throttle portion 311 is merely a through hole and the cross-sectional area through which the refrigerant can pass is unchanged, but the throttle portion may also have a variable cross-sectional area through which the refrigerant can pass. Good. That is, the opening degree of the valve port may be variable by moving the valve body forward and backward with respect to the valve port as the throttle portion. For example, the throttle portion may be a temperature type expansion valve, an electric valve, a solenoid valve, or the like.

Further, in the first embodiment, the wall portion (the partition wall 24 of the housing 2 and the side surface portions 32 of the drawing units 3A and 3B) that separates the refrigerant retention portion A1 and the low-pressure refrigerant passage portion A3 functions as heat exchange means. However, it is not limited to such a configuration. For example, the housing constituting the refrigerant retention portion and the housing constituting the low-pressure refrigerant passage portion may be arranged apart from each other, and heat may be exchanged by sandwiching a metal heat transfer member between them. Good.

Further, in the first embodiment, the refrigerant retention portion A1 and the liquid storage portion A2 are clearly distinguished, but these may not be clearly distinguished (that is, the throttle device at least retains the refrigerant). It suffices if the part is provided), and the refrigerant (particularly the liquid component) staying in the refrigerant retention part may be supplied to the throttle part.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

100A Refrigeration Cycle System 10A-10G Squeezer 11 Compressor 12 Condenser 13 Evaporator 2 Housing 21, 25 Primary Port 22 Secondary Port 24 Partition (Wall, Heat Exchange Means)
24A Concavo-convex part 24B Groove part 26 Refrigerant introduction cylinder 26A Cylinder upper part 26B Cylinder lower side part 311 Squeezing part 32 Side part (heat exchange means)
4, 5 Heat transfer members A1, A4 Refrigerant retention part A2, A5 Liquid storage part A3 Low pressure refrigerant passage part

Claims (12)

A primary port that accepts high-pressure refrigerant,
A throttle part that allows the refrigerant that has flowed in from the primary port to pass through, and
A refrigerant retention portion formed between the primary port and the throttle portion to retain the refrigerant, and a refrigerant retention portion.
A secondary port that sends out the refrigerant that has passed through the throttle,
A low-pressure refrigerant passing portion through which the refrigerant passes from the throttle portion to the secondary port, and a low-pressure refrigerant passing portion.
A throttle device including a heat exchange means for exchanging heat between the refrigerant retention portion and the low-pressure refrigerant passage portion. The throttle device according to claim 1, further comprising a liquid storage portion that stores a liquid component of the refrigerant staying in the refrigerant retention portion and supplies the liquid component to the throttle portion. A plurality of each of the throttle portion and the secondary port are provided.
The liquid storage unit is commonly provided for the plurality of the throttle units, and the liquid storage unit is provided in common.
The throttle device according to claim 1 or 2, wherein the refrigerant received from the primary port is distributed to the plurality of secondary ports. The throttle according to any one of claims 1 to 3, wherein the heat exchange means is provided on a wall portion surrounding the refrigerant retention portion and has an uneven portion on the surface on the refrigerant retention portion side. apparatus. The throttle device according to any one of claims 1 to 4, wherein the heat exchange means is arranged in the refrigerant retention portion and has a heat transfer member through which the refrigerant can pass. The drawing device according to claim 5, wherein the heat transfer member is made of a porous body or a mesh member. The throttle device according to claim 5 or 6, wherein the heat transfer member is provided from the refrigerant retention portion to the liquid storage portion. The heat exchange means is provided on a wall portion surrounding the refrigerant retention portion.
The throttle device according to any one of claims 1 to 7, wherein a groove extending toward the liquid storage portion is formed on the surface of the wall portion on the side of the refrigerant retention portion. The heat exchange means is provided on a wall portion surrounding the refrigerant retention portion.
The squeezing device according to any one of claims 1 to 8, wherein the surface of the wall portion on the side of the refrigerant retention portion is subjected to a water repellent treatment. The primary port opens upward in the vertical direction,
The throttle device according to any one of claims 1 to 9, wherein the liquid storage portion is arranged so as to be arranged below the refrigerant retention portion. The primary port opens downward in the vertical direction.
Further provided with a refrigerant introduction cylinder extending upward from the primary port.
The space above the refrigerant introduction cylinder and the space on the radial outer side of the upper portion of the cylinder serve as the refrigerant retention portion.
The throttle device according to any one of claims 1 to 9, wherein the lower space including the lower side portion of the refrigerant introduction cylinder serves as the liquid storage portion. The compressor for compressing the refrigerant, a condenser for condensing the compressed refrigerant, a squeezing device according to any one of claims 1 to 11 for expanding and depressurizing the condensed refrigerant, and evaporating the decompressed refrigerant. A refrigeration cycle system comprising one or more evaporators.

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