JP2013029236A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accumulator that hardly causes clogging of a filter.SOLUTION: The accumulator 25 includes a container 90, an oil return pipe 29, and a filter 60. The oil return pipe 29 includes a sub oil return pipe 29a disposed at a lower part to communicate the inside and the outside of a container 90 for separating the gas and the liquid of a refrigerant with each other, and a main oil return pipe 29b connected to the sub oil return pipe 29a. The filter 60 is disposed in the upstream side end located in the container 90 of the sub oil return pipe 29a via a welding part 62. The first filter mesh 64 of the filter 60 does not permit passage opf a separation target S while permitting the passage of freezer oil and a liquid refrigerant directed from a primary side to a secondary side. The normal N of the tangential plane T of at least a part C of the primary side of the first filter mesh 64 is directed downward or obliquely downward.

Description

  The present invention relates to an accumulator.

  Conventionally, a refrigerant circuit having an accumulator provided on the suction side of a compressor has been proposed.

  For example, in the refrigerant circuit described in Patent Document 1 (Japanese Patent Laid-Open No. 2006-105458), an accumulator is connected to the suction pipe so that liquid compression does not occur in the compressor. The suction pipe is provided so as to extend to a predetermined height inside the accumulator, and is configured to mainly suck the gas refrigerant existing above the inside of the accumulator container.

  In this accumulator, a filter is disposed inside the container. This filter is disposed further above the upper end of the suction pipe inside the accumulator container and between the tip of the inflow pipe for allowing the refrigerant to flow into the accumulator. By allowing the refrigerant flowing in the refrigerant circuit to pass through the filter, foreign substances such as iron powder and copper powder that have been mixed can be removed.

  The accumulator filter described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-105458) described above is disposed so that the entire primary side (upstream side before passing) is generally directed upward. For this reason, once the filter catches foreign matter mixed in the refrigerant, the foreign matter remains on the upper surface of the filter as it is.

  For this reason, the filter is clogged, and it may be difficult for the refrigerant and the refrigerating machine oil to pass through.

  This invention is made | formed in view of the point mentioned above, The subject of this invention is providing the accumulator which can make it hard to produce clogging of a filter.

  The accumulator according to the first aspect of the present invention includes a container, a refrigerant inflow pipe, a refrigerant outflow pipe, and an oil return pipe. The container causes gas-liquid separation of the internal refrigerant. The refrigerant inflow pipe and the refrigerant outflow pipe are arranged so as to communicate between the inside and the outside of the container. The oil return pipe is arranged below so as to communicate the inside and outside of the container. The suction port end located in the container of the oil return pipe is provided with a filter that allows passage of refrigeration oil and liquid refrigerant from the primary side to the secondary side but does not allow passage of the separation target. Yes. The normal line of at least a part of the tangent plane on the primary side of the filter is directed downward or obliquely downward. Here, the primary side of the filter means the side where the separation target that is not allowed to pass remains, that is, the upstream side in the flow direction through which the refrigeration oil or refrigerant passes. The secondary side of the filter is the opposite side from the primary side. The separation target is not particularly limited, and examples thereof include copper powder, iron powder, and oxide scale. Note that the refrigerating machine oil and the refrigerant in the container are not limited to those that are completely separated from each other as long as they are separated into a liquid refrigerant rich phase and a refrigerating machine oil rich phase. The liquid refrigerant rich phase and the refrigeration oil rich phase may be an upper phase of the liquid refrigerant rich phase and a lower phase of the refrigeration oil rich phase, or a lower phase of the liquid refrigerant rich phase and the refrigeration oil. The rich phase may be the upper phase.

  In this accumulator, at least a part of the primary side of the filter, the normal of the tangent plane faces downward or obliquely downward. For this reason, in the portion of the filter, the separation target that is not allowed to pass falls downward due to its own weight. For this reason, it is possible to avoid the state in which the part of the filter is covered with the separation target. Thereby, clogging of the filter can be suppressed.

  The accumulator which concerns on the 2nd viewpoint of this invention is the accumulator which concerns on a 1st viewpoint. Among the filters, the area of the cut surface obtained by cut | disconnecting the space which the surface of the secondary side of a filter divides by a horizontal surface becomes the largest. In the portion below the position, the normal line of the tangent plane is formed so as to face obliquely downward in the entire primary side surface.

  In this accumulator, it is difficult to cause clogging, and it is possible to secure a wider area that allows the addition of refrigerating machine oil and liquid refrigerant.

  The accumulator which concerns on the 3rd viewpoint of this invention is the accumulator which concerns on a 1st viewpoint or a 2nd viewpoint, and the oil return pipe | tube has an internal piping part extended upwards toward the container inside from the lower end of the container. The filter is located above the internal piping portion.

  In this accumulator, when the separation target separated from the refrigerating machine oil by the filter falls downward, the separation target remains in a state of being located below the container. Even in this state, the filter is not blocked by the separation target. As described above, the refrigerating machine oil can be more reliably supplied to the compressor.

  An accumulator according to a fourth aspect of the present invention is the accumulator according to any one of the first aspect to the third aspect, wherein the filter has a substantially conical shape with the lower side as the apex side.

  In this accumulator, it is possible to secure a wide surface (for example, a conical surface portion) that is not easily blocked by the separation target.

  In the accumulator according to the first aspect of the present invention, it is possible to suppress clogging of the filter.

  In the accumulator according to the second aspect of the present invention, clogging is unlikely to occur, and it is possible to secure a wider area that allows the addition of refrigerating machine oil and liquid refrigerant.

  In the accumulator which concerns on the 3rd viewpoint of this invention, it becomes possible to supply refrigeration oil to a compressor more reliably.

  In the accumulator which concerns on the 4th viewpoint of this invention, it becomes possible to ensure widely the surface which is hard to block | close by the to-be-separated object.

It is a schematic block diagram of the air conditioning apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram in the side view of an accumulator. It is a schematic block diagram in the top view of an accumulator. It is a principal part enlarged view of the filter vicinity part of the lower end of an accumulator. It is a schematic block diagram in the side view of a filter. It is a schematic block diagram in the side view of the filter of other embodiment (5-1). It is a schematic block diagram in the side view of the filter of other embodiment (5-2). It is a schematic block diagram in the side view of the accumulator of other embodiment (5-3). It is a schematic block diagram in the side view of the accumulator of other embodiment (5-5).

  Hereinafter, an air conditioning apparatus 1 will be described as an example of a refrigeration apparatus according to an embodiment of the present invention with reference to the drawings.

  FIG. 1 is a refrigerant circuit diagram showing a refrigerant circuit 10 of the air conditioner 1.

(1) Schematic configuration of air conditioner 1 In the air conditioner 1, an outdoor unit 2 as a heat source side device and an indoor unit 4 as a use side device are connected by a refrigerant pipe, and the use side device is arranged. Perform air conditioning of the space. The air conditioner 1 includes a refrigerant circuit 10, various sensors, and a control unit 70.

  The refrigerant circuit 10 includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an outdoor electromagnetic expansion valve 24, an accumulator 25, an outdoor fan 26, an indoor heat exchanger 41, an indoor fan 42, and the like. These are connected to each other. Note that the compressor 21, the four-way switching valve 22, the outdoor heat exchanger 23, the outdoor electromagnetic expansion valve 24, the accumulator 25, and the outdoor fan 26 are accommodated in the outdoor unit 2. The indoor heat exchanger 41 and the indoor fan 42 are accommodated in the indoor unit 4.

  The four-way switching valve 22 can switch between a cooling operation cycle and a heating operation cycle. In FIG. 1, the connection state when performing the cooling operation is indicated by a solid line, and the connection state when performing the heating operation is indicated by a dotted line. During the cooling operation, the outdoor heat exchanger 23 functions as a refrigerant cooler, and the indoor heat exchanger 41 functions as a refrigerant heater. During the heating operation, the indoor heat exchanger 41 functions as a refrigerant cooler, and the outdoor heat exchanger 23 functions as a refrigerant heater.

  An indoor temperature sensor 43 is provided in the indoor unit 4. The indoor temperature sensor 43 is disposed on the indoor air inlet side, and detects the temperature (that is, the indoor temperature) before the indoor unit 4 takes in the room and passes through the indoor heat exchanger 41.

  The control unit 70 includes an outdoor control unit 72 that is disposed in the outdoor unit 2 and controls the devices of the outdoor unit 2, an indoor control unit 74 that is disposed in the indoor unit 4 and controls the devices of the indoor unit 4, and from the user A controller 71 that accepts various setting inputs and performs various display outputs and various sensors are connected by a communication line 70a. The control unit 70 performs various controls for the air conditioner 1.

  In addition, although the combination of the refrigerant | coolant and refrigerator oil used in the air conditioning apparatus 1 is not specifically limited, For example, when a refrigerant | coolant is R410A, you may use ether type synthetic oil (for example, FVC68D) as refrigerator oil, When the refrigerant is R134a, an ether-based synthetic oil (for example, FVC46D) may be used as the refrigerating machine oil, and when the refrigerant is R404A, an ether-based synthetic oil (for example, FVC50K) may be used as the refrigerating machine oil. However, a combination of these may be used together as a mixed refrigerant and a compatible refrigerating machine oil. In each of the above combinations, when the refrigeration oil and the refrigerant are separated in the container 90 of the accumulator 25, the refrigeration oil is preferably located below the refrigerant (the specific gravity of the refrigeration oil is greater than that of the refrigerant). .

(2) Configuration and Form of Accumulator 25 FIG. 2 shows a schematic configuration diagram of the accumulator 25 in a side view. In FIG. 3, the schematic block diagram in the top view of the accumulator 25 is shown. FIG. 4 shows an enlarged schematic configuration diagram of a main part in a side view of the vicinity of the lower end of the accumulator 25. In FIGS. 2 and 4, the thickness of only the container 90 and the base 81 is indicated by a dotted line.

  The accumulator 25 includes a container 90, a refrigerant inflow pipe 27, a refrigerant outflow pipe 28, an oil return pipe 29, and a filter unit 60.

  The container 90 is constituted by an upper portion 91, a central portion 92, and a lower portion 93 of the accumulator 25. The central portion 92 has a substantially cylindrical shape, and has an outer diameter of 165.2 mm and a thickness of 5.1 mm. The upper portion 91 has a thickness equivalent to that of the central portion 92, is formed wider in the radial direction by the thickness than the central portion 92, and is welded in a state of being fitted to the central portion 92 from above. ing. Similarly, the lower portion 93 has a thickness equivalent to that of the central portion 92, is formed wider in the radial direction by the thickness than the central portion 92, and is fitted into the central portion 92 from below. Welded. Although the material of the container 90 is not specifically limited, For example, it can be comprised by STPG370E (carbon steel pipe for pressure steel pipes), ASTM-A53B (steel pipe for piping), and this combination. In this embodiment, the height of the container 90 is 727.5 mm, and the container 90 has a capacity of 11.2 liters and a design pressure of 3.5 MPa. The material, shape, and dimensions of the container 90 are not limited to this, and for example, the container 90 has a height of 850.5 mm and a capacity of 13.5 liters, or the container 90 has a height of 955. 0.5 mm and a capacity of 15.5 liters may be used, and can be selected according to the system to be used.

  The refrigerant inflow pipe 27 is a pipe for allowing the refrigerant to flow into the container 90 of the accumulator 25. The refrigerant inflow pipe 27 is arranged so as to penetrate the vicinity of the upper end of the central portion 92 of the accumulator 25 in the plate thickness direction, and is fixed by welding. The upstream end of the refrigerant inflow pipe 27 is connected to one of the ports of the four-way switching valve 22 through another refrigerant pipe. Note that the refrigerant inflow pipe 27 extends in a substantially horizontal direction to the downstream end portion 27a in the internal space of the container 90, and extends upward in the outside of the container 90. The material of the refrigerant inflow pipe 27 is preferably a copper pipe, and for example, C1220T-O or C1220T-H can be used as the JIS standard number. The refrigerant inflow pipe 27 is not particularly limited, but may be, for example, an outer diameter of 22.2 mm and a wall thickness of 1.6 mm, or an outer diameter of 25.4 mm and a wall thickness of 1.15 mm. Good. The design pressure of the refrigerant inflow pipe 27 is preferably 3.5 MPa.

  The refrigerant outflow pipe 28 is a pipe for allowing the refrigerant to flow out from the container 90 of the accumulator 25 to the outside. The refrigerant outflow pipe 28 is arranged in the vicinity of the upper end of the central portion 92 of the accumulator 25 so as to penetrate in the plate thickness direction in the portion above the through portion and the downstream end of the refrigerant inflow tube 70. It is touched and fixed by welding. The downstream end of the refrigerant outflow pipe 28 is connected to the suction side of the compressor 21 via another refrigerant pipe (the suction pipe of the compressor 21). The refrigerant outflow pipe 28 extends further upward than the penetrating portion in the internal space of the container 90. The upstream end portion 28a of the refrigerant outlet pipe 28 faces substantially upward in the vertical direction, and is disposed so as to face a lower surface near the upper end of the upper portion 91 of the container 90 while ensuring a slight gap. ing. The refrigerant outflow pipe 28 extends downward outside the container 90. The material of the refrigerant outflow pipe 28 is preferably a copper pipe like the refrigerant inflow pipe 27, and for example, C1220T-O or C1220T-1 / 2H can be used as the JIS standard number. The refrigerant outflow pipe 28 is not particularly limited. For example, the outer diameter may be 19.1 mm and the wall thickness may be 1.15 mm, or the outer diameter may be 25.4 mm and the wall thickness may be 1.15 mm. Good. The design pressure of the refrigerant outflow pipe 28 is preferably 3.5 MPa.

  The oil return pipe 29 is a pipe for guiding the refrigeration oil and the liquid refrigerant (mainly refrigeration oil) present in the accumulator 25 to the suction side of the compressor 21, and the auxiliary oil return pipe 29a and the main oil return pipe 29b. have.

  The auxiliary oil return pipe 29a is a copper pipe provided so as to penetrate the vicinity of the lower end of the lower portion 93 of the container 90 in the vertical direction. The secondary oil return pipe 29 a is welded to the lower portion 93 of the container 90. Although not particularly limited, it is preferable that a portion of the auxiliary oil return pipe 29a from the upper surface side of the lower portion 93 of the container 90 (an internal piping portion) has a length of about 5 to 30 mm. Moreover, although it does not specifically limit, it is preferable that the length below about 5-30 mm is ensured from the lower surface side of the lower part 93 of the container 90 among the secondary oil return pipe | tubes 29a. The outer diameter of the secondary oil return pipe 29a is substantially equal to the inner diameter of the main oil return pipe 29b.

  The main oil return pipe 29b is connected by welding its upstream end (suction side end) to the lower end (downstream end) of the sub oil return pipe 29a. As shown in FIG. 1, the downstream end of the main oil return pipe 29b is connected to a confluence point P in the middle of the suction pipe of the compressor 21 via another refrigerant pipe. An electromagnetic valve 29c that adjusts the area of the passage passage is provided in the middle of the main oil return pipe 29b (that is, downstream of the container 90). By adjusting the valve opening degree of the electromagnetic valve 29c, the flow rate of the refrigerating machine oil or a slight liquid refrigerant passing through the oil return pipe 29 is adjusted, and the suction fluid is gasified before being sucked into the compressor 21. Thus, liquid compression can be prevented. In addition, the main oil return pipe 29b of this embodiment was bent so as to extend slightly downward (about 30 to 60 mm) from the welded portion with the auxiliary oil return pipe 29a and then extend obliquely upward. It has a shape. The material of the main oil return pipe 29b is preferably a copper pipe similarly to the refrigerant inflow pipe 27 and the refrigerant outflow pipe 28, and for example, C1220T-O can be used as the JIS standard number. The main oil return pipe 29b is not particularly limited. For example, the main oil return pipe 29b can have an outer diameter of 6.4 mm and a wall thickness of 0.8 mm. The design pressure of the main oil return pipe 29b is preferably 3.5 MPa.

  The filter unit 60 separates the refrigerating machine oil and liquid refrigerant (mainly refrigerating machine oil) inside the container 90 so that the separation target S such as copper powder, iron powder, or oxide scale is not mixed, and the oil return pipe 29. It has a filtration function to lead to The upper end of the filter part 60 is preferably located below the downstream end part 27a of the refrigerant inflow pipe 27 and the upstream end part 28a of the refrigerant outflow pipe 28. Although not particularly limited, the entire filter unit 60 is within the range of 0 to 20% from the bottom, more preferably 1 to 10% from the bottom with respect to the total volume inside the container 90 of the accumulator 25. It is preferable that it is located in.

  As shown in FIG. 2, the accumulator 25 includes a peripheral structure (not shown) having fixing members 82, 83, 84 welded to the outer periphery of the central portion 92 of the container 90 on the side by a base 81 on the lower side. It is supported by being fixed to.

  Hereinafter, a detailed configuration of the filter unit 60 will be described.

(3) Detailed Configuration of Filter Unit 60 The filter unit 60 has a ring support member 63, a first filter mesh 64, a second filter mesh 65, and a welded portion 62 as shown in the schematic external configuration diagram of FIG. doing.

  The ring support member 63 is made of stainless steel, and has a ring formation in which the inside is hollowed out so that the inner diameter is larger than the outer diameter of the auxiliary oil return pipe 29a. The ring support member 63 has a posture that extends in a substantially horizontal direction, and is arranged so that the center of the ring is positioned vertically above the center of the auxiliary oil return pipe 29a.

  The lower end portion of the first filter mesh 64 is gathered and fixed via the welded portion 62 at the upper end of the auxiliary oil return pipe 29a. The first filter mesh 64 is gathered along the circumference of the ring support member 63 by the upper peripheral portion of the first filter mesh 64 being sandwiched between the ring support members 63. As shown in FIG. 5, the first filter mesh 64 is preferably formed with wrinkles extending in the bus line direction, and substantially free of wrinkles extending in the horizontal direction. preferable. By being formed in this way, the strength of the filter unit 60 can be increased, and it can be prevented that the filter unit 60 is crushed in the vertical direction by its own weight.

  The second filter mesh 65 is provided so as to spread in a substantially horizontal direction at a cutout portion inside the ring support member 63.

  Both the first filter mesh 64 and the second filter mesh 65 are configured to allow the passage of the refrigerating machine oil and the liquid refrigerant (mainly the refrigerating machine oil) without allowing the separation target S to pass.

  Although the material of the 1st filter mesh 64 and the 2nd filter mesh 65 is not specifically limited, For example, you may be comprised with the stainless steel wire (for example, SUS304-W1). Although not particularly limited, the diameter length of one line knitted to form the first filter mesh 64 or the second filter mesh 65 is the shape of the first filter mesh 64 or the second filter mesh 65 itself. It is preferable that it has the intensity | strength which can hold | maintain, for example, (phi) 20-50mm is more preferable, and (phi) 35mm is especially preferable. The mesh roughness of the first filter mesh 64 and the second filter mesh 65 is preferably 50 to 150 meshes per inch (50 mesh to 150 mesh), and is approximately 100 meshes per inch (100 mesh). This is particularly preferred.

  The first filter mesh 64 is fixed via a welded portion 62 in the vicinity of the upper end of the auxiliary oil return pipe 29a, but extends to the ring support member 63 so that the radius of the inner horizontal surface gradually increases as it goes vertically upward. Thus, it has an inverted conical shape. For this reason, as shown in FIG. 5, among the primary-side surfaces formed by the first filter mesh 64, the primary-side surface of the filtration (the surface on the side where the separation target S is separated and left, the refrigerating machine oil and the liquid The downstream surface in the refrigerant passage direction) is formed so as to be inclined so that the normal line N of the tangential plane T in at least a part C faces obliquely downward.

(4) Features In the accumulator 25 of the above embodiment, the first filter mesh 64 and the second filter mesh 65 of the filter unit 60 are provided. For this reason, even if the to-be-separated object S such as copper powder, iron powder or oxide scale is mixed in the refrigerant or refrigerating machine oil flowing into the container 90 of the accumulator 25, the first filter mesh 64 and the second filter mesh 65 can pass only the refrigerating machine oil and the liquid refrigerant (mainly the refrigerating machine oil) without passing the separation target S. For this reason, the supply of the refrigerating machine oil to the compressor 21 is stably performed while preventing the separation target S from being supplied to the compressor 21, thereby preventing the compressor 21 from running out of oil and scorching. The lubrication of the machine 21 can be kept in a good state.

  Furthermore, the first filter mesh 64 of the filter unit 60 is provided so as to be inclined so that the normal line of the surface is directed obliquely downward. For this reason, when the first filter mesh 64 captures the separation target S, the separation target S is not allowed to pass through, but can be dropped downward by its own weight (copper). The separation target S such as powder, iron powder, and oxide scale (copper oxide) is precipitated because it has a higher specific gravity than the refrigerating machine oil. For this reason, it can be prevented that the filter eyes of the first filter mesh 64 are kept closed by the separation target S.

  And between the lower end of the 1st filter mesh 64 of the filter part 60, and the lower end vicinity of the upper surface side of the lower part 93 of the container 90 of the accumulator 25, the secondary oil return pipe | tube 29a is extended toward the perpendicular upper direction. The first filter mesh 64 is disposed away from the lower portion 93 of the container 90 upward. For this reason, the separation target S captured by the first filter mesh 64 and falling downward is in contact with the lower portion 93 of the container 90 (in some cases, the outer peripheral surface of the auxiliary oil return pipe 29a). However, there is no contact with the first filter mesh 64. Therefore, in the state where the separation target S is dropped, the first filter mesh 64 does not have a portion that is blocked by the separated separation target S, so that the refrigerating machine oil or the liquid refrigerant can be efficiently guided to the compressor 21. It becomes possible.

(5) Other Embodiments Embodiments of the present invention are not limited to the above-described embodiments. For example, the following embodiments are also included in the embodiments of the present invention. (5-1)
In the said embodiment, the filter part 60 by which the 2nd filter mesh 65 was provided inside the ring support member 63 was mentioned as an example, and was demonstrated.

  However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 6, a filter unit 160 whose upper end portion is configured by a circular plate 163 spreading in the horizontal direction may be used.

  Even in this case, similarly to the above embodiment, the first filter mesh 64 can be prevented from being blocked by the separation target S.

  In addition, compared with the ring support member 63 of the said embodiment, it is also possible to raise the intensity | strength as the filter part 160 whole.

(5-2)
In the said embodiment, the cone-shaped filter part 60 which makes a downward direction a vertex direction was mentioned as an example, and was demonstrated.

  However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 7, the second filter mesh 65 of the filter unit 60 of the above embodiment is omitted, and the upper ring support member 263 and the third filter are omitted. The filter unit 260 may further include a mesh 264.

  The third filter mesh 264 has a substantially conical shape with the vertically upward direction as the apex direction. The periphery of the lower end portion of the third filter mesh 264 is gathered by the upper ring support member 263. For this reason, when the separation target S comes to the primary side of the third filter mesh 264, the separation target S falls obliquely downward along the primary side surface of the third filter mesh 264. Thereby, also about the 3rd filter mesh 264, it can suppress to some extent that a mesh part is block | closed with the to-be-separated object S. As described above, since the total area through which the refrigeration oil can pass is increased not only by the passage area of the first filter mesh 64 but also by the passage area of the third filter mesh 264, the refrigeration oil is more reliably transferred to the compressor 21. Can be led to.

  In the example of this other embodiment, the ring support member 63 and the upper ring support member 263 are integrally configured, and the first filter mesh 64 and the third filter mesh 264 are held together. The embodiment may be sufficient.

(5-3)
In the above embodiment, the accumulator 25 having the auxiliary oil return pipe 29a of the oil return pipe 29 has been described as an example.

  However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 8, the secondary oil return pipe 29a is not provided, but the filter part 360 is fixed to the vicinity of the lower end on the upper surface side of the lower part 93 of the container 90 via the welded part 362, and the oil return pipe 329 is provided. The accumulator 325 may be configured such that the upstream side end portion thereof is welded and fixed near the lower end on the lower surface side of the lower portion 93 of the container 90.

  In the accumulator 325, the space on the secondary side of the first filter mesh 64 of the filter unit 360 and the inside of the oil return pipe 329 communicate with each other through the opening of the lower portion 93 of the container 90.

  In this case, when the separation target S falls on the upper surface of the lower part 93, there is a possibility that a part near the lower end of the first filter mesh 64 may be blocked, but at least the upper part of the first filter mesh 64. Since it is not blocked, the supply of refrigeration oil to the compressor 21 can be maintained.

(5-4)
In the above embodiment, the case where the electromagnetic valve 29c for adjusting the passage flow passage area is provided in the middle of the oil return pipe 29 has been described as an example.

  However, the embodiment of the present invention is not limited to this. For example, it is not necessary to provide a device for controlling a solenoid valve or the like in the middle of the oil return pipe 29. For example, an orifice hole is provided. There may be. Even in this case, liquid compression in the compressor 21 can be prevented by adjusting the size of the designed orifice hole. Although the size of the inner diameter of the orifice hole is not particularly limited, for example, a diameter of about 1.0 mm can be cited as an example.

(5-5)
In the said embodiment, the filter part 60 in which the whole primary side surface of the 1st filter mesh 64 has faced diagonally downward was mentioned as an example, and was demonstrated.

  However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 9, a filter unit 460 having a fourth filter mesh 464 formed in a substantially cylindrical shape may be used.

  In the filter unit 460, the normal line N1 of the lower surface (or its tangent plane) is directed downward, and the normal line N2 of the side surface (or its tangent plane) is directed in the horizontal direction. Even in this shape, the separation target S does not stay on the surface of the fourth filter mesh 464 and falls downward due to its own weight. Thereby, it becomes possible to ensure supply of the refrigeration oil to the compressor 21 while suppressing clogging of the filter unit 460.

(5-6)
In the said embodiment, the air conditioning apparatus was mentioned as an example and demonstrated as an example of a freezing apparatus.

  However, the embodiment of the present invention is not limited to this. For example, as another example of the refrigeration apparatus, a cooling-only machine or a heating-only machine may be used.

(5-7)
Naturally, the above embodiment and the other embodiments (5-1) to (5-6) are also included in the present invention even in an embodiment that is appropriately combined.

  The accumulator of the present invention is configured to allow the refrigerating machine oil and refrigerant sent to the oil return pipe to pass through the filter and to prevent the filter from being clogged. Therefore, the accumulator and refrigerant provided with the oil return pipe It is particularly useful in circuits, refrigeration equipment and the like.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 25 Accumulator 27 Refrigerant inflow pipe 28 Refrigerant outflow pipe 29 Oil return pipe 29a Secondary oil return pipe (internal piping part)
29b Main oil return pipe 60 Filter section 64 First filter mesh (filter)
65 Second filter mesh 90 Container 160 Filter unit 260 Filter unit 264 Third filter mesh 325 Accumulator 360 Filter unit 460 Filter unit 464 Fourth filter mesh S Object to be separated

JP 2006-105458 A

Claims (4)

A container (90) for gas-liquid separation of the refrigerant;
A refrigerant inflow pipe (27) and a refrigerant outflow pipe (28) arranged to communicate with the inside and outside of the container;
An oil return pipe (29) arranged below to communicate with the inside and outside of the container;
With
The end of the suction port located in the container of the oil return pipe is not allowed to pass the separation target (S) while allowing passage of refrigeration oil and liquid refrigerant from the primary side to the secondary side. Filters (64, 264, 464) are provided,
The normal of at least a part of the tangent plane on the primary side of the filter is directed downward or obliquely downward,
Accumulator (25, 325). Among the filters, in a portion below the position where the area of the cut surface obtained by cutting the space defined by the surface on the secondary side of the filter with a horizontal plane is the largest, in the entire surface on the primary side , The normal of the tangent plane is formed diagonally downward,
The accumulator according to claim 1. The oil return pipe has an internal pipe portion (29a) extending upward from the lower end of the container toward the inside of the container,
The filter is located above the internal piping part,
The accumulator according to claim 1 or 2. The filter has a substantially conical shape with the lower side as the apex side,
The accumulator according to any one of claims 1 to 3.

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