JP6225626B2 - Filter unit - Google Patents

Description

  The present invention relates to a filter unit that removes foreign substances contained in a refrigerant of a refrigeration cycle apparatus.

  For example, an oil separator for a refrigerant compressor described in Patent Document 1 includes a separation unit that separates oil from a refrigerant, and an oil storage chamber that stores the separated oil, and a magnet for capturing foreign matter is placed in the oil storage chamber. Have. The magnet is held by a support fitting in the middle of the separated oil flow, and can capture magnetic foreign matters such as iron powder in the oil. The support metal fitting is made of a steel plate because it is spot-welded to a steel housing of an oil separator.

  If hard iron-based magnetic foreign matter is not removed from the refrigerant or oil separated from the refrigerant, abnormal sliding of the compressor sliding part, or clogging of the oil flow path or increase in flow resistance will result. Since abnormal wear or seizure due to poor lubrication may occur, it can be said that a magnet as described in Patent Document 1 is essential for a refrigeration cycle apparatus using a refrigeration compressor.

JP 2010-48170 A

  In Patent Document 1, foreign substances to be captured are limited to magnetic foreign substances such as iron powder, but not only iron-based materials but also copper-based materials, aluminum alloy materials, and synthetic resin materials are included in the components of the refrigeration cycle apparatus. In addition, since dust may be mixed during assembly, it is desired to provide a filter for capturing such non-magnetic foreign substances made of non-ferrous metals or non-metals. In particular, when carbon dioxide is used as the refrigerant, the compression mechanism portion of the compressor and the expansion mechanism portion of the expansion valve are smaller and more accurate than the case of the fluorocarbon refrigerant. There is a need to remove foreign matter at a higher removal rate including non-magnetic foreign matter.

  However, in order to provide a filter that captures nonmagnetic foreign matter, a process for fixing the filter together with the filter is also necessary.

  In addition, if a filter that captures non-magnetic foreign matter is provided in a place different from the place where the magnet is installed, a fixing member is required in each of them, resulting in an increase in manufacturing cost. In addition, due to space limitations for installation, there has been a case where an appropriate layout for sufficiently exhibiting the foreign matter capturing ability cannot be realized.

  A fine mesh screen is generally used as a filter for capturing non-magnetic foreign matter, but the mesh screen itself has low rigidity, so it satisfies the ability to maintain posture and ensure the tightness of foreign matter. Instead, it required additional stiffening members. In order to increase the rigidity without using a stiffening member or the like, a mesh screen with a large wire diameter must be used, but the mesh screen with such a large wire diameter has a problem that the eyes become rough. there were. In addition, the mesh screen has a relatively high material cost, and if the material cost and assembly cost of an additional stiffening member are included, there is a problem in that the manufacturing cost for providing a filter for capturing non-magnetic foreign matter increases. there were.

  The present invention has been made in view of the above problems, and has a simple and simple structure for assembling and removing foreign substances contained in the fluid circulating in the refrigeration cycle apparatus. It aims at providing a filter unit with high capture capability.

  The present invention is a filter unit that removes foreign matter from refrigerant or oil that is a fluid circulating in the refrigeration cycle apparatus as technical means for achieving the above-described problem, and a magnet (20) that captures magnetic foreign matter; A holding member (21) for holding the magnet (20), the holding member (21) being formed integrally from one material, and allowing fluid to flow and fluid A filter unit is provided, characterized in that it comprises a large number of small holes (211) for trapping foreign matter therein.

According to this, since the holding member has a function of filtering foreign matter through a small hole in addition to a fixing function of holding the magnet in the refrigeration cycle apparatus, a filtering member such as a mesh screen is added to the holding member. In addition, it is possible to manufacture a filter unit that can capture magnetic foreign matter and non-magnetic foreign matter only at a low cost using only the holding member and the magnet. Further, since the entire holding member is formed of a single material having a thickness, for example, compared to a mesh screen, it is easy to increase its rigidity, and therefore no additional stiffening member is required.
Moreover, in this invention, a plate-shaped raw material can be used for the raw material of a holding member (21). In this case, since the degree of freedom of the molding shape is increased, for example, it becomes easy to add a function for positioning the magnet (20) or holding the magnet (20) to the holding member.

  Furthermore, in the present invention, the plate-like material may be a perforated plate having a large number of small holes on the entire surface. Such a perforated plate with small holes pre-drilled is mass-produced by a specialized manufacturer and can be obtained at a low cost, so that the manufacturing cost can be reduced compared to processing small holes in a normal plate material. it can.

  Furthermore, in this invention, a holding member (21) may be formed by press-molding a plate-shaped raw material. Thereby, it becomes possible to raise the freedom degree of the shape of a holding member comparatively easily, and to produce in large quantities at low cost.

  In the present invention, the holding member (21) may be formed such that its outer peripheral portion (212) is fitted to the inner wall of a cylindrical member (37) for mounting the filter unit therein. According to this, even if a gap is generated between the outer peripheral portion of the holding member and the inner wall of the cylindrical member, the filter unit can be maintained in a positive posture and fluid from the gap can be maintained. And it becomes possible to prevent the outflow of foreign matter downstream.

  In this invention, the external shape of the blank material (24) for the holding member (21) which consists of a plate-shaped raw material may be a polygon. Thereby, it becomes possible to increase the number of blanks obtained from a single standard material plate as compared with a circular case.

  In the present invention, the magnet (20) is disposed on the upstream side of the holding member (21) with respect to the flow of the fluid, and the holding member (21) is formed of a magnetic material to attract the magnet (20). May be fixed.

  According to this, a relatively strong magnetic field can be formed on the upstream side of the filter unit, and the magnetic foreign matter floating in the flow can be efficiently adsorbed by the adsorption surface of the magnet (20) facing the flow. Is possible. Moreover, since the magnet (20) is being fixed to the holding member (21) by the attractive force, the member for fixing the magnet can be omitted, and the configuration can be simplified. In addition, since the holding member (21) is magnetized, the vicinity of a large number of small holes (211) through which the fluid passes is also magnetized, and the ability to capture magnetic foreign matters can be further improved.

  In this invention, the holding member (21) can have the recessed part (213) for positioning a magnet (20) in a center part. According to this, since the positioning of the magnet (20) is ensured, it is possible to prevent the occurrence of a magnetic field bias due to the displacement of the magnet (20), and hence the decrease in the ability to capture magnetic foreign matter.

  In the present invention, the holding member (21) has a magnet placing part (216) for placing the magnet (20) and at least one claw part (215) facing the magnet placing part (216). Then, the magnet (20) may be sandwiched between the magnet placing portion (216) and the claw portion (215). As a result, the magnet can be fixed more reliably without increasing the number of parts.

  In the present invention, the filter unit further includes an elastic member (23) attached to the holding member (21), and the magnet (20) is sandwiched between the holding member (21) and the elastic member (23). Good. Thereby, fixation of a magnet can be made more reliable.

  In the present invention, the elastic member (23) may be a wire spring or a leaf spring.

  In the present invention, the refrigerant may be carbon dioxide. As described above, when the refrigerant is carbon dioxide, the pressure condition becomes high pressure and high load compared to the case of the chlorofluorocarbon refrigerant, so that the management of foreign matters becomes strict. Is preferred.

  The present invention is an oil separator (3) used in a refrigerant compressor, and is arranged in a separation part (31) for separating oil from the refrigerant, an oil storage chamber (33) for storing the separated oil, and an oil storage chamber And an oil separator (3) comprising the above-described filter unit for removing foreign substances contained in the oil.

  According to this, since the space in the oil storage chamber (37) of the oil separator (3) can be used effectively for the installation of the filter unit, the necessary passage area is secured by the oil storage chamber (37) of the existing size. As a result, it is possible to provide an oil separator that can reliably capture magnetic and non-magnetic foreign matter in separated oil without increasing the physique.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a longitudinal cross-sectional view of the oil separator and refrigerant | coolant compressor with which the filter unit by the 1st Embodiment of this invention was mounted | worn. It is the top view and longitudinal cross-sectional view of the said filter unit, A top view is shown by (a) and a longitudinal cross-sectional view is shown by (b). It is a top view of the blank material for the holding member of the said fitter unit. It is a longitudinal cross-sectional view of a holding member simple substance. It is a longitudinal cross-sectional view which shows the filter unit of 1st Embodiment fixed to the oil separator. It is a top view which shows the state with which the filter unit by the 2nd Embodiment of this invention was mounted | worn with the oil separator. It is a longitudinal cross-sectional view which shows the state with which the filter unit by the 2nd Embodiment of this invention was mounted | worn with the oil separator. It is the top view and longitudinal cross-sectional view of the filter unit by the 3rd Embodiment of this invention, A top view is shown by (a) and a longitudinal cross-sectional view is shown by (b).

(First embodiment)
Hereinafter, a filter unit 2 according to a first embodiment of the present invention will be described with reference to FIG. 1 which is a longitudinal sectional view of an oil separator 3 to which the filter unit 2 is attached and a refrigerant compressor 1 to which the oil separator 3 is connected. .

  A refrigerant compressor 1 shown in FIG. 1 is a scroll type compressor, which houses an electric motor section 12 and a compression mechanism section 13 in a sealed container 11 and recirculates from an external refrigerant circuit (not shown). Is compressed and sent to the refrigerant circuit via the oil separator 3, and the oil separated by the oil separator 3 is returned to the movable portion of the compression mechanism portion 13. Further, the sealed container 11 of the refrigerant compressor 1 forms a so-called internal low-pressure container whose pressure is lower than the discharge pressure of the refrigerant. The refrigerant compressed by the refrigerant compressor 1 is carbon dioxide in the present embodiment, but it may be a fluorocarbon refrigerant.

  The oil separator 3 in FIG. 1 is used by being connected to the refrigerant compressor 1 in order to separate the oil mixed in the refrigerant used in the refrigeration cycle apparatus. The oil storage part 32 which is provided under the separation part 31 and forms the oil storage chamber 33 for storing the separated oil, and the filter unit 2 disposed in the oil storage chamber 33 are provided as main components. The separation portion 31 and the oil storage portion 32 have a sealed structure that can withstand high pressure acting on the inside thereof.

  The separation part 31 is of a centrifugal separation type, and has a separation cylinder 34 that forms a cylindrical inner space, and a separation pipe 36 that communicates with the refrigerant delivery port 35, and the separation pipe 36 has a large diameter part. The large diameter portion is concentrically coupled to the upper portion of the separation cylinder 34. A refrigerant inlet 34a protrudes laterally at the upper part of the peripheral wall portion of the separation cylinder 34, and the refrigerant inlet 34a is formed on the peripheral wall portion of the separation cylinder 34 in a direction and position so as to form a swirling flow when the refrigerant flows in. Opened. An oil outlet 34 b communicating with the oil storage chamber 33 is provided at the center of the lower end portion of the separation cylinder 34.

  The other end of the compressor discharge pipe 14 whose one end is connected to the refrigerant discharge chamber of the refrigerant compressor 1 is connected to the refrigerant inlet 34a, and the refrigerant from the compressor 1 enters the separator 31 from the refrigerant inlet 34a. Supplied. In addition, a refrigerant pipe that guides the refrigerant to a condenser (not shown) constituting the refrigeration cycle apparatus is connected to the refrigerant outlet 35 of the separation pipe 36.

  The oil storage section 32 includes a cylindrical main housing 37 and a substantially hemispherical lower housing 38 below the main housing 37. The main housing 37 is welded and joined to the lower housing 38 on the lower side, and is welded to the separated cylinder base 34c of the separated cylinder 34 on the upper side to form the oil storage chamber 33 therein. An oil feed port 38a is provided at the bottom of the lower housing 38, and one end of the oil feed pipe 15 is connected to the oil feed port 38a. The other end of the oil feeding pipe 15 is connected to an oil return pipe 16 protruding from the refrigerant compressor 1, and further communicated with an oil passage 17 inside the compressor 13. 1 also shows oil stored in the oil storage chamber 33, and the filter unit 2 is located in the oil below the oil level OL. In this embodiment, the filter unit 2 is disposed at the upper end of the lower housing 38. A flow rate adjusting mechanism 18 is installed in the middle of the oil passage 17 to adjust the flow rate of oil flowing from the oil storage chamber 33 to the compression mechanism unit 13 to an appropriate amount.

Next, the filter unit 2 according to the first embodiment of the present invention arranged in the oil separator 3 will be described below with reference to FIGS.
The filter unit 2 of the first embodiment captures non-magnetic foreign matter contained in oil while holding the magnet 20 and a relatively flat cylindrical magnet 20 that catches iron-based foreign matter contained in oil. Holding member 21. In this embodiment, the magnet 20 is disposed upstream of the holding member 21 with respect to the oil flow.

  The holding member 21 is formed in a substantially bottomed cylindrical shape or cap shape having a circular recess 213 in the center, and has a circular outer shape when viewed from the plan view of FIG. The circular concave portion 213 for positioning and supporting the magnet 20 at the center thereof and the filtration portion 214 which is a region extending horizontally around the concave portion 213 mainly pass non-magnetic foreign matters while allowing oil to pass therethrough. A filter part 214 having a large number of small holes 211 to be captured, and an outer peripheral part 212 forming a cylindrical surface of the substantially bottomed cylindrical holding member 21, which are below the horizontal filter part 214 in FIG. And an outer peripheral portion 212 bent into a bent shape. The magnet positioning recess 213 is formed of a horizontal placement portion 216 for placing a magnet and a peripheral vertical circumferential wall portion.

The holding member 21 is integrally formed from a single material, and more specifically, a steel perforated plate having a large number of small holes on its entire surface, that is, a so-called punched metal steel plate is used as a material and is press-molded. This is formed into a cap shape. For this reason, although the small hole 211 is not illustrated, it is also formed in the recessed part 213 and the outer peripheral part 212. However, in this embodiment, oil hardly flows into the small hole 211 of the recessed part 213 and the outer peripheral part 212.
However, an embodiment in which the holding member 21 is formed not from a general-purpose punched metal steel plate but from a dedicated material plate having a small hole 211 only at a necessary portion, that is, the filtration portion 214 is also possible.

  As shown in FIG. 5, the filter unit 2 is attached in a state where the outer peripheral portion 212 of the holding member 21 is fitted to the inner wall of the lower portion of the main housing 37 of the oil storage portion 32 of the oil separator 3. In addition, the filter unit 2 is usually immersed in oil stored in the oil storage section 32. In this embodiment, the outer diameter of the outer peripheral portion 212 of the holding member 21 is made slightly larger than the inner diameter of the housing 37 so that the filter unit 2 is press-fitted and fixed to the main housing 37. Since it is press-fitted, there is almost no gap between the outer peripheral portion 212 of the holding member 21 and the inner wall of the main housing 37, so that almost the entire flow rate of the circulating oil passes through the small hole 211 of the holding member 21 and the oil Foreign matter larger than the small hole 211 is captured.

  In this embodiment, since the holding member 21 is formed from a punched metal steel plate, the magnet 20 is attracted and fixed to the holding member 21 by a magnetic force. Due to the magnetic force acting in this way and the effect of the concave portion 213 of the holding member 21, the magnet may be displaced from a predetermined center position or jump out of the holding member 21 even if the filter unit 2 receives vibration or the like. Is prevented.

  When the magnet 20 is disposed in the recess 213, it is preferable that the upper end of the magnet 20 is flush with the upper surface of the filtering portion 214 of the holding member 21 or slightly protrudes from the upper surface. Thereby, the region where the magnetic field generated by the magnet 20 is strong can be made wider.

Next, the punching metal steel plate used as a material of the holding member 21 of the filter unit 2 of the first embodiment will be described in more detail.
As is well known, punched metal steel plates having various hole diameters and plate thicknesses are mass-produced by specialized manufacturers, so that it is possible to obtain products having desirable specifications at low cost. As shown in detail in FIG. 3A, the small holes of the punched metal steel plate are usually arranged regularly and densely in a circular shape with the same hole diameter. The hole diameter of the small hole is determined from the size of the nonmagnetic foreign matter to be captured, and is preferably selected from the range of φ0.1 to φ1 mm if the filter unit 2 is used for filtering the oil of the compressor. The plate thickness is preferably selected from a range of t0.1 to t1 mm in consideration of strength and press formability.

  The blank member 24 made of a punched metal steel plate for forming the holding member 21 in the first embodiment has an octagonal contour shape in which four corners of a square are chamfered as shown in FIG. In addition, it has four short sides 24b of the chamfered portion and four main long sides 24a. In FIG. 3, the center side circle 24 c and the outer side circle 24 d indicated by a two-dot chain line correspond to the inner diameter of the recessed portion 213 of the holding member 21 after molding and the outer diameter of the holding member 21, respectively. A region outside the outer circle 24 d corresponds to the outer peripheral portion 212 of the holding member 21. And when the holding member 21 is shape | molded by press molding from such an octagonal blank 24, as FIG. 4 shows, the maximum height part 21b of the outer peripheral part 212 from the short side 24b of the blank 24 is. From the long side 24a, the constricted portion 21a of the outer peripheral portion 212 that is convexly curved upward in the drawing is formed.

In the present embodiment, it is confirmed that the fixing force of the filter unit 2 by press-fitting the oil separator into the main housing 37 is sufficiently ensured even if the constricted portion 21a is present. Thus, in the present embodiment in which the constricted portion 21a is allowed, the blank member 24 can be formed into an octagonal shape close to the square shown in FIG. It is possible to obtain the blank material 24 efficiently. If the constricted portion 21a is not allowed, a circular blank material (not shown) whose contour is a circumscribed circle (not shown) with respect to the octagon shown in FIG. 3 may be used. However, in that case, of course, the number of blanks that can be obtained from a single punched metal steel sheet is reduced as compared with the octagonal shape of FIG. 3, and the manufacturing cost is increased.
The outline of the blank material is not limited to an octagon or a circle, and polygonal embodiments such as a triangle and a quadrangle are also possible.

  The small holes of the blank 24 are circular as shown in detail in FIG. 3A, but the circular small holes are shown in FIG. 2A when the holding member 21 is formed. Furthermore, it changes into a substantially oval small hole 211 that is slightly elongated in the radial direction but narrowed in the circumferential direction. This is because drawing processing is involved in forming the recess 213 of the holding member 21. When deformed from a circular shape to a substantially oval shape, the short diameter of the substantially oval shape after deformation becomes smaller than the diameter of the original circular shape, so that it becomes possible to capture a smaller foreign object than can be captured in the original circular shape. . Alternatively, it is possible to use a punched metal steel plate having a hole diameter larger than a circular hole diameter corresponding to a necessary capturing capability as a material in anticipation of contraction of the short diameter width. In addition, since the price of a punching metal steel sheet usually decreases as the hole diameter increases, the use of a punching metal steel sheet with a larger hole diameter in this way leads to a reduction in manufacturing cost.

Next, a method for attaching the filter unit 2 and a foreign matter capturing action will be described below with reference to FIG.
The main housing 37 of the oil storage section 32 of the oil separator 3 is welded and joined to the lower housing 38 with the lower housing 38 partially inserted therein. As a result, the upper end of the lower housing 38 is inserted into the lower end of the main housing. A stepped portion by 38b is formed. Prior to the welding, the filter unit 2 is inserted into the lower end portion of the main housing 37 in advance, so that the holding member 21 is inserted into the lower end portion of the main housing 37 by inserting the lower housing 38 into the lower end portion of the main housing 37. It is pushed up and attached in a state of being in contact with the stepped portion. Therefore, the filter unit 2 is usually attached in the lower part of the oil storage chamber 33 while being immersed in the oil storage oil. In the present embodiment, in order to reduce assembly man-hours, the holding member 21 of the filter unit 2 is set so that the outer diameter of the outer peripheral portion 212 is slightly larger than the inner diameter of the main housing 37, and It is press-fitted and fixed.

  The oil in the oil storage chamber 33 flows from the upper side to the lower side in FIG. The magnet 20 is placed on the upstream side of the holding member 21 so that its attracting surface faces the flow, and forms a relatively strong magnetic field on the upstream side of the filter unit 2, so it floats in the flow. Magnetic foreign substances can be adsorbed efficiently. Further, since the magnet 20 is located substantially in the center in the radial direction in the oil storage chamber 33, a magnetic field is generated in the oil storage chamber 33 almost symmetrically over the entire area, and as a result, in the oil flowing in the oil storage chamber. The contained magnetic foreign matter can be attracted and captured by the magnet 20 more efficiently.

  Further, the oil is discharged from the downstream oil supply port 38 a through a large number of small holes 211 opened in the holding member 21. At that time, foreign matter larger than the small hole 211 is captured including non-magnetic foreign matter. Further, in the embodiment, since the holding member 21 is a magnetic body and is itself magnetized, the periphery of the large number of small holes 211 through which the fluid passes is also magnetized. Therefore, the holding member 21 can also adsorb magnetic foreign substances from the flowing oil. Therefore, the magnetic foreign matter can be more reliably captured by the filter unit 2 of the present embodiment.

(Second Embodiment)
Next, the filter unit 102 according to the second embodiment will be described with reference to FIGS. 6 and 7 showing a state in which the filter unit 102 is attached to the main housing 37 of the oil separator. Configurations or structures not described in the following description are basically the same as those in the first embodiment.

  In the filter unit 102 according to the second embodiment, the outer peripheral portion 212 of the holding member 21 is bent toward the upstream side of the oil flow, that is, the upper side in FIG. A cut (not shown) is formed in a part of the outer peripheral portion 212 in order to obtain two opposing claws 215 having a long and narrow band shape. Further, the outer peripheral portion 212 of the holding member 21 of the filter unit 102 does not have the constricted portion 21a as in the case of the first embodiment in the case of this embodiment, but if the claw can be formed, There may be a constriction in the other part.

  The claw portion 215 functions to restrain the magnet 20 when bent to the inner peripheral side of the unit, that is, the magnet side. Therefore, the length of the claw portion 215 is on the upper surface of the magnet 20 when bent. Has a length to reach. Therefore, in the filter unit 102 of the second embodiment, the magnet 20 is not only placed on the magnet placing portion 216 in the recessed portion 213 of the holding member and attracted to the steel holding member 21, but also the pawl. Since it is restrained by the part 215 or is sandwiched between the magnet placing part 216 and the claw part 215, the protrusion from the concave part 213 is prevented.

  In the second embodiment, it is preferable that the claw portion 215 is bent so that the tip thereof is in contact with the magnet 20, but it is assumed that there is a slight gap between the tip of the claw portion 215 and the magnet 20. It will be understood that the effect of preventing the magnet 20 from protruding from the recess 213 is exhibited. From this point of view, the above expression that the magnet is “suppressed” by the pawl or “clamped” by the pawl and the magnet mounting portion 216 applies even when the pawl 215 is not completely in contact with the magnet. Is done.

In this embodiment, two claw portions 215 are provided. However, one may be provided as long as the disengagement prevention function is satisfied, and conversely, three or more may be provided.
If such a claw portion is provided, a modification of the present embodiment in which the material of the holding member 21 is a nonmagnetic material is also possible.

(Third embodiment)
Next, the filter unit 202 of the third embodiment will be described with reference to FIG. In addition, configurations or structures not described in the following description are basically the same as those of the first embodiment.

  The filter unit 202 according to the third embodiment is different from the filter unit 2 according to the first embodiment in further including an elastic member 23. The elastic member 23 is formed so as to sandwich the magnet 20 with the magnet mounting portion 216 of the holding member 21 in order to prevent the magnet 20 from jumping out of the concave portion 213 when it receives vibration or the like. In the present embodiment, the elastic member 23 is a wire spring formed of a spring steel wire rod, and a curved portion 23a that is convexly curved downward in FIG. 8, and a linear portion 23b that extends in the vertical direction at both ends thereof, It has the hook part 23c of the lower end of the linear part 23b. The elastic member 23 is configured such that when the hook portion 23c is hooked in a mounting hole (not shown) of the holding member 21, the lower end portion of the bending portion 23a is in contact with the upper surface of the magnet 20 to exert a pressing force based on elastic deformation. It is formed.

  In the third embodiment, the holding member 21 is made of steel and made of a magnetic material. However, a modification example in which the material of the holding member is made of a nonmagnetic material is also possible, and even in this case, the magnet is prevented from coming off due to vibration or the like. be able to.

In the third embodiment, the elastic member 23 is formed as a wire spring having the curved portion 23 a, the straight portion 23 b, and the hook portion 23 c described above, but acts on the magnet 20 based on elastic deformation. Other arbitrary shapes are possible if possible, and they may be formed as leaf springs instead of wire springs.
In the third embodiment, the material of the elastic member 23 is spring steel. However, an embodiment of an elastic member using a copper-based spring material, a rubber material, or a synthetic resin as a material is also possible.
Furthermore, in the third embodiment, the elastic member 23 is fixed by being hooked on the holding member 21, but the elastic member is fixed to the inner wall of the main housing 37 of the oil storage section 32 by means such as press fitting. Is also possible.

(Other embodiments)
In each of the above-described embodiments, the filter unit is fixed to the oil separator by press-fitting the outer peripheral portion thereof, but is an embodiment in which the filter unit is fitted and inserted into the oil separator using an intermediate fit or a clearance fit. Is also possible.

  In each of the above-described embodiments, the recess 213 is provided, but an embodiment without the recess is also possible. In that case, for example, a plurality of small protrusions can be protruded from the holding member around the magnet to be arranged to serve as positioning means.

  The filter unit 2 according to each of the embodiments described above is disposed in the oil storage chamber 33 of the oil separator 3 that can ensure a relatively wide flow path area. However, the filter unit 2 is disposed in the oil storage chamber of the oil separator 3. It is not limited to 33, and may be arranged in various devices or pipes constituting the refrigeration cycle apparatus. Therefore, you may arrange | position in the refrigerant | coolant which flows through a refrigerating-cycle apparatus instead of in oil.

2, 102, 202 Filter unit 20 Magnet 21 Holding member 21a Constricted portion 23 Elastic member 24 Blank material 211 Small hole 212 Outer peripheral portion 213 Recessed portion 214 Filtration portion 215 Claw portion 216 Magnet placement portion

Claims (14)

A filter unit (2, 102, 202) for removing foreign substances from refrigerant or oil, which is a fluid circulating through the refrigeration cycle apparatus,
A magnet (20) for capturing magnetic foreign matter;
A holding member (21) for holding the magnet (20),
The holding member (21) is formed integrally from a single material, and includes a plurality of small holes (211) that allow the fluid to flow and capture foreign substances in the fluid. And
The filter unit (2, 102, 202), characterized in that a material of the holding member (21) is a plate and is a perforated plate having the plurality of small holes (211 ). The filter unit (2, 102, 202) according to claim 1, characterized in that the plate-like material of the holding member (21) is a punching metal. The filter unit (2, 102, 202) according to claim 1 or 2, characterized in that the numerous small holes (211) of the holding member (21) are circular. The filter unit (2, 102, 202) according to any one of claims 1 to 3, characterized in that at least some of the small holes of the holding member (21) are substantially oval. ). The filter unit (2, 102, 202) according to any one of claims 1 to 4 , characterized in that the holding member (21) is formed by press-molding the plate-shaped material. The holding member (21) is formed such that an outer peripheral portion (212) thereof is fitted to an inner wall of a cylindrical member (37) for mounting the filter unit therein. The filter unit (2, 102, 202) according to any one of claims 1-5 . The filter unit ( 1) according to any one of claims 1 to 6 , characterized in that the outer shape of the blank (24) for the holding member (21) made of the plate-like material is a polygon. 2, 102, 202). The magnet (20) is arranged on the upstream side of the holding member (21) with respect to the flow of the fluid, and the holding member (21) is made of a magnetic material, thereby causing the magnet (20) to move. The filter unit (2, 102, 202) according to any one of claims 1 to 7 , wherein the filter unit (2, 102, 202) is fixed by suction. The holding member (21), characterized in that a recess (213) for positioning said magnet (20) in the central portion, the filter unit according to any one of claims 1-8 (2 , 102, 202). The holding member (21) has a magnet placing part (216) for placing the magnet (20) and at least one claw part (215) facing the magnet placing part (216). The filter unit (1) according to any one of claims 1 to 9 , wherein the magnet (20) is sandwiched between the magnet mounting portion (216) and the claw portion (215). 102). An elastic member (23) attached to the holding member (21);
The filter unit (202) according to any one of claims 1 to 9 , wherein the magnet (20) is sandwiched between the holding member (21) and the elastic member (23). . The filter unit (202) according to claim 11 , characterized in that the elastic member (23) is a wire spring or a leaf spring. The filter unit (2, 102, 202) according to any one of claims 1 to 12 , characterized in that the refrigerant is carbon dioxide. An oil separator (3) used in a refrigerant compressor,
A separation unit (31) for separating oil from the refrigerant;
An oil storage chamber (33) for storing the separated oil;
An oil separator comprising: the filter unit (2, 102, 202) according to any one of claims 1 to 13 , which is disposed in the oil storage chamber and removes foreign matters contained in oil. 3).

Images