CN108343750B - Electric valve and refrigeration cycle system - Google Patents

Abstract

The invention provides an electric valve and a refrigerating cycle system. The electric valve (100) is formed by assembling a supporting member (2) and a closed casing (3) relative to a valve casing (1), and a fixing metal piece (23) of the supporting member is attached. ) and the closed housing are reliably welded relative to the valve housing to eliminate poor welding. A stepped portion (11) is provided on the entire circumference of the opening end portion of the valve housing. The stepped portion is composed of an inner first annular surface (11a) and an outer second annular surface (11b). The fixing metal fitting (23) is arranged on the inner side of the second annular surface (11b), and the flange portion (232) is brought into contact with the first annular surface (11a). The entire circumference of the contact portion between the first annular surface (11a) and the flange portion (232) is welded. The second annular surface (11b) is brought into contact with the opening end of the lower end of the airtight case. Weld the entire circumference of the contact portion between the second annular surface (11b) and the opening end of the airtight case. With respect to the valve housing (valve main body), the support member and the hermetic case are welded at different positions in the axis (L) direction.

Description

Electric valve and refrigeration cycle system

technical field

The present invention relates to an electric valve used in a refrigeration cycle system and the like, and a refrigeration cycle system.

Background technique

Conventionally, as such an electric valve, the rotation of the magnetic rotor and the rotor shaft of the stepping motor is used to operate the rotor shaft and the valve member via the screw feed mechanism, and the valve member opens and closes the valve port. In addition, a support member for supporting the rotor shaft is provided. Such an electric valve is disclosed in, for example, Japanese Patent No. 5395775 (Patent Document 1).

In addition, this conventional electric valve needs to seal the flow path of the fluid, and the motor part magnetic rotor is accommodated in a cylindrical sealed case (housing) that forms a sealed structure together with the valve body. Then, the valve body and the airtight case are hermetically fixed by welding or the like. In addition, a male screw portion is formed on the rotor shaft of the stepping motor, and the rotor shaft is supported by the support member by screwing the male screw portion with the female screw portion of the support member. Furthermore, the support member and the hermetic case are fitted to the upper part of the valve housing (valve main body).

prior art literature

Patent Literature

Patent Document 1: Japanese Patent No. 5395775

SUMMARY OF THE INVENTION

The problem to be solved by the invention

In the technique of the above-mentioned Patent Document 1, when the support member and the airtight case are assembled to the valve case, the support member is first fitted to the opening end of the valve case, and the metal fitting and the opening end of the valve case are fixed. The periphery is fixed by welding. Then, the closed case is fixed to the open end of the valve housing by welding.

As described above, in the conventional technology, the support member and the airtight case are generally fixed by welding with respect to the same end surface of the opening end of the valve housing, and therefore, there are the following problems. The fixing metal piece of the support member is first welded to the end face of the open end of the valve casing. Therefore, when the closed casing is assembled, the molten and solidified portion (weld bead) of the fixing metal piece caused by welding is formed at the open end of the valve casing. end face of the part. Therefore, the airtight case and the molten solidified portion may interfere, and the airtight case may be displaced or defective in welding.

An object of the present invention is to provide an electric valve in which a support member for supporting the rotor shaft on the axis and a hermetic case for accommodating the magnetic rotor are assembled with respect to the valve main body, the electric valve connecting the fixing metal fitting of the support member and the magnetic rotor. The hermetic case is reliably welded to the valve body without defective welding.

solutions to problems

Claim 1 is an electric valve in which a support member and a cylindrical metal hermetic case are assembled to a cylindrical metal valve body, wherein the valve body has a built-in pass motor A valve member that operates by rotating a magnetic rotor of a portion and a rotor shaft, the support member supports the rotor shaft on the axis, the airtight case accommodates the magnetic rotor, and the electric valve is characterized in that the support member has a fixing metal fitting The fixing metal is formed with a protruding surface protruding in a direction orthogonal to the axis on the outer circumference around the axis, and an opening end of the valve body to which the support member is fitted has a surface located at right angles to the axis around the axis. A first annular surface on the inner side of the plane, and a second annular surface located on the outer side of the plane perpendicular to the axis around the entire circumference of the axis, and the first annular surface and the second annular surface A step portion is formed so that the position of the surface in the direction of the axis is different, the contact portion between the first annular surface of the valve body and the fixing metal fitting of the support member is welded, and the second ring of the valve body is welded. The contact portion of the shape surface with the opening end of the airtight case.

Claim 2 The electric valve according to Claim 1, wherein the fixing metal fitting has a sag surface portion formed by press working of sheet metal, and the back side of the sag surface portion abuts on the first annular surface and is welded the abutting part.

Claim 3 The electric valve according to Claim 2, wherein the fixing metal fitting has an asymmetric shape with respect to a plane orthogonal to the axis.

Claim 4 The electric valve according to Claim 4, wherein the support member has a resin-made base that is press-fitted into the opening end of the valve body, and the fixing metal fitting is configured to have a cylinder centered on the axis. a protruding surface protruding in a direction orthogonal to the axis L is formed on the outer periphery of the edge, and the fixing metal fitting is arranged in the base part so that the edge is located inside the valve body , and insert molding together with the above-mentioned base.

Claim 5 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the refrigeration cycle system is characterized by using the electric valve described in any one of Claims 1 to 4 as the expansion valve.

Invention effect

According to the electric valves of claims 1 to 4, when the support member and the hermetic case are assembled with respect to the valve body, the position of the first annular surface of the fixing metal piece and the axis for welding the second annular surface of the hermetic case are welded Since the positions of the directions are different, when the sealed case is welded, the melted and solidified portion does not interfere with the sealed case, and the sealed case can be reliably welded.

According to the electric valve of claim 2, since the burr surface portion generated during the press working of the fixing metal piece abuts on the first annular surface of the valve main body and is welded, there is no gap when it comes into contact with the sag surface portion during welding. Therefore, fusing and insufficient strength during welding are eliminated, and stable weldability is obtained.

According to the electric valve of claim 3, since the fixing metal piece has an asymmetric shape with respect to the plane perpendicular to the axis, the burr surface is formed by making the metal mold structure in which the fixing metal piece cannot enter when it is turned over during insert molding of the support member. Since it is always in contact with the first annular surface of the valve body, stable weldability can be obtained, and the work of distinguishing the front and back surfaces is unnecessary, and the assemblability is improved.

According to the motor-operated valve of claim 4, since the edge of the fixing metal fitting is arranged inside the valve body in the base of the support member, even if stress is generated with respect to the base when the base of the support member is pressed into the opening end of the valve body, the Deformation of the inner diameter surface of the base portion can be prevented by the reinforcing action of the edge, the movement of the valve holder sliding on the inner diameter surface of the base portion is not deteriorated, and deterioration of valve operability can be prevented.

According to the refrigeration cycle system of claim 5, the same effects as those of claims 1 to 4 can be obtained.

Description of drawings

FIG. 1 is a vertical cross-sectional view of an electric valve according to a first embodiment of the present invention.

2 is a cross-sectional view and a partially enlarged cross-sectional view of a fixing metal fitting of the electric valve according to the first embodiment.

3 is a cross-sectional view of an assembly portion of a valve housing, a support member, and an airtight case of the electric valve of the first embodiment.

4 is a cross-sectional view of a valve housing, a support member, and a fitting portion of an airtight case of an electric valve according to a second embodiment.

FIG. 5 is a diagram showing a refrigeration cycle system according to the embodiment.

In the picture:

1—valve housing (valve body), 11—step portion, 11a—first annular surface, 11b—second annular surface, 101—first joint pipe, 102—second joint pipe, 103—valve seat ring, 103a—valve port, 2—support part, 21—frame part, 21a—internal thread part, 22—base part, 23—fixed metal part, 231—edge, 232—flange part, A—sag surface, B—burr Face, 3—hermetic shell, 4—valve frame, 5—needle valve (valve part), 6—stepping motor (motor part), 61—rotor shaft, 61a—external thread, 62—magnetic rotor, 63— Stator coil, P—melting and solidifying portion, Q—melting and solidifying portion, 1’—valve housing (valve body), 12—step portion, 12a—first annular surface, 12b—second annular surface, 23′—fixed Metal parts, 232'-flange part, 3'-hermetic shell, P'-melting and solidifying part, Q'-melting and solidifying part, L-axis, 100-electric valve (expansion valve), 200-outdoor heat exchanger , 300—indoor heat exchanger, 400—flow switching valve, 500—compressor.

Detailed ways

Next, embodiments of the electric valve and the refrigeration cycle system of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view of the electric valve according to the first embodiment, FIG. 2 is a sectional view and a partially enlarged sectional view of a fixing metal fitting of the electric valve according to the first embodiment, and FIG. 3 is a valve housing and a support of the electric valve according to the first embodiment. Cross-sectional view of the assembled parts of the components and hermetic housing. In addition, the concept of "up and down" in the following description corresponds to the up and down in the drawing of FIG. 1 .

The electric valve 100 includes a valve housing 1 as a "valve body", a support member 2, a closed case 3, a valve holder 4, a needle valve 5 as a "valve member", and a stepping motor 6 as a "motor part".

The valve housing 1 is formed in a substantially cylindrical shape from stainless steel or the like, and has a valve chamber 1R inside the valve housing 1 . The first joint pipe 101 that is in conduction with the valve chamber 1R is connected to the outer peripheral side of the valve housing 1, and the second joint pipe 102 is connected to the cylindrical portion extending downward from the lower end. In addition, the valve seat ring 103 is fitted on the valve chamber 1R side of the second joint pipe 102 . The inner side of the valve seat ring 103 becomes a valve port 103a, and the second joint pipe 102 is communicated with the valve chamber 1R via the valve port 103a. In addition, the first joint pipe 101 , the second joint pipe 102 , and the valve seat ring 103 are fixed to the valve housing 1 by welding or the like.

The support member 2 includes a central frame portion 21 , a thick base portion 22 on the outer periphery of the frame portion 21 , and a fixing metal fitting 23 to be described later. The fixing metal fitting 23 is integrally provided with the frame portion 21 and the base portion 22 by insert molding. Thereby, the fixing metal fitting 23 is protrudingly provided on the outer periphery around the axis L of the support member 2 . Then, as will be described later, the support member 2 is fixed to the upper end portion of the valve housing 1 by welding via the fixing metal fitting 23 . In the center of the frame portion 21, a female screw portion 21a and its screw hole coaxial with the axis L are formed, and a cylindrical guide hole 21b having a larger diameter than the screw hole of the female screw portion 21a is formed.

The airtight case 3 is formed in a substantially cylindrical shape with an upper end closed, and is hermetically fixed to the upper end of the valve housing 1 by welding as described later. A guide member 31 is provided in the upper part of the airtight case 3 , and a rotation limiting mechanism 32 is provided on the outer periphery of the guide 31 .

The valve holder 4 is a cylindrical member, which is fitted in the guide hole 21b of the support member 2, and is arranged so as to be slidable in the axis L direction. Furthermore, the needle valve 5 is fixed to the lower end portion of the valve holder 4 . In the valve holder 4, a spring seat 41 is provided so as to be movable in the direction of the axis L, and a compression coil spring 42 is attached between the spring seat 41 and the needle valve 5 in a state of being given a predetermined load.

The stepping motor 6 includes a rotor shaft 61 , a magnetic rotor 62 rotatably disposed inside the airtight case 3 , a stator coil 63 disposed opposite to the magnetic rotor 62 on the outer periphery of the airtight case 3 , and others not shown. yokes, external mounting parts, etc. shown. The rotor shaft 61 is attached to the center of the magnetic rotor 62 , and the rotor shaft 61 extends toward the support member 2 side. A male screw portion 61 a is formed on the outer periphery of the rotor shaft 61 on the support member 2 side, and the male screw portion 61 a is screwed to the female screw portion 21 a of the support member 2 . In the guide hole 21 b of the support member 2 , the upper end of the valve holder 4 is engaged with the lower end of the rotor shaft 61 , and the valve holder 4 and the needle valve 5 are supported by the rotor shaft 61 so as to be rotatably suspended. In addition, the upper end portion of the rotor shaft 61 is rotatably fitted into the guide 31 in the airtight case 3 .

According to the above structure, the magnetic rotor 62 and the rotor shaft 61 are rotated by the driving of the stepping motor 6 , and the rotor shaft 61 is rotated by the screw feeding mechanism between the male screw portion 61 a of the rotor shaft 61 and the female screw portion 21 a of the support member 2 . Move in the direction of the axis L. Then, the valve member 5 moves in the direction of the axis L to approach or separate from the valve seat ring 103 . Thereby, the valve port 103 a is opened and closed, and the flow rate of the refrigerant flowing from the first joint pipe 101 to the second joint pipe 102 or from the second joint pipe 102 to the first joint pipe 101 is controlled. Further, the upper and lower rotational positions of the magnetic rotor 62 are restricted by the rotation limit mechanism 32 .

In this way, the electric valve 100 is an electric valve made of a cylindrical metal with a built-in needle valve 5 (valve member) that operates by the rotation of the magnetic rotor 62 of the stepping motor 6 (motor part) and the rotor shaft 61 The valve housing 1 (valve main body) is equipped with a support member 2 that supports the rotor shaft 61 on the axis L, and an electric valve in which a cylindrical metal hermetic casing 3 that accommodates the magnetic rotor 62 is assembled.

As shown in FIG. 2 , the fixing metal fitting 23 is formed by stamping of stainless steel sheet metal, and integrally includes: a cylindrical edge 231 centered on the axis L; The flange portion 232 of the protruding surface protruding in the intersecting direction. As shown in the partially enlarged view enclosed by the dotted circle in FIG. 2 , a sag surface A by pressing is formed on the outer periphery of the flange portion 232 and at the end portion on the opposite side to the edge 231 . Moreover, in the state before welding of this fixing metal fitting 23, the burr surface part B by press work is formed in the edge part on the side opposite to the sag surface part A. Since the burr surface portion B generated by the press working is subjected to the burr treatment after the press working, the burr surface portion B does not have burrs. In addition, the metal fitting 23 is welded and fixed to the portion B of the burr surface.

As shown in FIGS. 1 and 3 , the base portion 22 of the support member 2 is press-fitted into the opening end portion of the upper end of the valve housing 1 . The fixing metal fitting 23 is arranged in the base portion 22 of the support member 2 so that the edge 231 is on the valve chamber 1R side of the valve housing 1 , and is insert-molded together with the base portion 22 . In addition, the valve housing 1 has the stepped portion 11 at the opening end portion of the base portion 22 of the fitting support member 2 . The stepped portion 11 has a first annular surface 11 a and a second annular surface 11 b located on the inner side in a plane orthogonal to the axis L over the entire circumference around the axis L, respectively. The positions of the first annular surface 11a and the second annular surface 11b in the axis L direction are different. In the first embodiment, the second annular surface 11b is formed at a lower position in the axis L direction than the first annular surface 11a. 1 and 3 , longitudinal sections of the valve housing 1 and the hermetic housing 3 are shown, but the valve housing 1 is rotationally symmetric around the axis L except for the hole in which the first joint pipe 101 is fitted. shape. In addition, the cylindrical portion on the valve housing 1 side of the airtight case 3 has a rotationally symmetrical shape around the axis L. As shown in FIG.

The fixing metal fitting 23 of the support member 2 is arranged inside the second annular surface 11b, and the flange portion 232 of the fixing metal fitting 23 is in contact with the first annular surface 11a. And the whole circumference of the contact part of this 1st annular surface 11a and the flange part 232 is welded, and the fusion|melting and solidification part P is formed in the whole circumference. Thereby, the support member 2 is fixed to the valve housing 1 . In addition, the opening end of the lower end of the airtight case 3 is in contact with the second annular surface 11b. And the whole circumference of the contact part of this 2nd annular surface 11b and the opening end part of the airtight case 3 is welded, and the fusion|melting and solidification part Q is formed in the whole circumference. Thereby, the airtight case 3 is fixed to the valve case 1 .

In this way, when the support member 2 and the hermetic case 3 are assembled to the valve case 1 (valve main body), the position of the welding and fixing metal fitting 23 (the flange portion 232 ) is higher in the direction of the axis L than the second annular surface 11b s position. Therefore, when the sealed case 3 is welded, the melted and solidified portion P does not interfere with the sealed case 3, and the sealed case 3 can be reliably welded.

In addition, the fixing metal fitting 23 is welded so that the above-mentioned burr surface portion B of the flange portion 232 abuts on the first annular surface 11 a of the valve housing 1 . Assuming that welding is attempted so that the sag surfaces are brought into contact with each other, a gap occurs and the weldability becomes unstable, so that welding failure is likely to occur. However, in the embodiment, the burr surface portion B of the flange portion 232 abuts on the first annular surface 11a, eliminates the gap when it comes into contact with the sag surface A, and stabilizes the welded shape. Therefore, it is only necessary to perform welding on the abutting wire, so that fusing and insufficient strength during welding can be eliminated, and stable weldability can be obtained.

In addition, the fixing metal piece 23 has the edge 231 only on one side. That is, the fixing metal has a sag surface A by press working of sheet metal, and has an asymmetric shape with respect to a surface orthogonal to the axis L. Therefore, by adopting a metal mold structure in which the fixing metal fitting 23 cannot enter when it is turned over during the insert molding of the support member 2, the burr surface surely abuts on the first annular surface of the valve body, so that stable weldability can be achieved. In addition, there is no need to perform the work of distinguishing the front and back, and the assemblability is improved.

In addition, since the edge 231 of the fixing metal fitting 23 is located on the valve chamber 1R side of the valve housing 1 in the base portion 22 of the support member 2 , even if the base portion 22 is pressed into the opening end of the valve housing 1 , the valve housing 1 is released from the valve housing 1 by the pressure. The opening end portion of the base portion 22 generates stress in the radial direction (inward) of the axis L, and the deformation of the inner diameter surface of the base portion 22 can also be prevented by the reinforcing effect of the edge 231 . Therefore, the movement of the valve holder 4 sliding on the inner diameter surface of the base portion 22 is not deteriorated, and the valve operability can be prevented from being deteriorated.

4 is a cross-sectional view of a valve housing, a support member, and a fitting portion of an airtight case of an electric valve according to a second embodiment. The second embodiment differs from the first embodiment in the opening end of the valve housing, the outer diameter of the fixing metal fitting, and the height of the airtight case. The other structures are the same as those in FIG. 1 , and the same reference numerals as in FIGS. 1 to 3 are assigned to the same elements and corresponding elements as those of the first embodiment, and repeated description and illustration of the overall structure are omitted.

The valve housing 1 ′ of the second embodiment has the stepped portion 12 at the opening end portion of the fitting base 22 . The stepped portion 12 has a first annular surface 12 a and a second annular surface 12 b located on the inner side in a plane orthogonal to the axis L over the entire circumference around the axis L, respectively. The positions of the first annular surface 12a and the second annular surface 12b in the direction of the axis L are different. In this second embodiment, the second annular surface 12b is formed at a higher position in the axis L direction than the first annular surface 12a. The valve case 1 ′ and the hermetic case 3 ′ of the second embodiment are the same as those of the first embodiment, and the other main parts are rotationally symmetrical about the axis L. As shown in FIG.

The fixing metal fitting 23' of the support member 2 is arranged inside the second annular surface 12b, and the flange portion 232' of the fixing metal fitting 23' is in contact with the first annular surface 12a. Then, the entire circumference of the contact portion of the first annular surface 12a and the flange portion 232' is welded, and the molten solidified portion P' is formed on the entire circumference. Thereby, the support member 2 is fixed to the valve housing 1'. Moreover, the opening end part of the lower end of the airtight case 3' is in contact with the second annular surface 12b. Then, the entire circumference of the contact portion between the second annular surface 12b and the opening end portion of the airtight case 3' is welded, and the molten solidified portion Q' is formed on the entire circumference. Thereby, the airtight case 3' is fixed to the valve housing 1'.

In this way, in the second embodiment, when the support member 2 and the hermetic case 3 are assembled with respect to the valve housing 1 (valve main body), the position of the welding and fixing metal fitting 23' (the flange portion 232') is compared with that of the second annular The surface 12b is a low position in the axis L direction. Therefore, when the sealed case 3' is welded, the melted and solidified portion P' does not interfere with the sealed case 3', and the sealed case 3' can be reliably welded.

FIG. 5 is a diagram showing a refrigeration cycle system according to the embodiment. In the drawings, reference numeral 100 denotes an electric valve according to an embodiment of the present invention constituting an expansion valve, reference numeral 200 denotes an outdoor heat exchanger mounted on an outdoor unit, reference numeral 300 denotes an indoor heat exchanger mounted on an indoor unit, and reference numeral 400 denotes a configuration 4 The flow path switching valve of the through valve, reference numeral 500 is a compressor. The electric valve 100 , the outdoor heat exchanger 200 , the indoor heat exchanger 300 , the flow switching valve 400 , and the compressor 500 are respectively connected by pipes as shown in the figure, and constitute a heat pump refrigeration cycle. In addition, the accumulator, the pressure sensor, the temperature sensor, etc. are not shown in figure.

The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to two, the flow path during the cooling operation and the flow path during the heating operation. During the cooling operation, the refrigerant compressed by the compressor 500 flows from the flow switching valve 400 into the outdoor heat exchanger 200, as indicated by the solid arrow in the figure, and the outdoor heat exchanger 200 functions as a condenser, and flows from the outdoor heat exchanger 200 to the outdoor heat exchanger 200. The liquid refrigerant flowing out of the heat exchanger 200 flows into the indoor heat exchanger 300 via the electric valve 100, and the indoor heat exchanger 300 functions as an evaporator.

On the other hand, during the heating operation, the refrigerant compressed by the compressor 500 flows from the flow switching valve 400 to the indoor heat exchanger 300, the electric valve 100, and the outdoor heat exchanger, as indicated by the broken line arrow in the figure. 200, the flow path switching valve 400, and the compressor 500 are sequentially cycled, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing from the outdoor heat exchanger 200 during the cooling operation or the liquid refrigerant flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.

In the description of the embodiment of the present invention, the welding of the fixing metal fitting and the annular surface of the main body is the whole circumference welding, but the welding is not limited to the whole circumference welding, and may be local welding.

As mentioned above, although embodiment of this invention was described in detail with reference to drawings, specific structure is not limited to these embodiment, Design change etc. which do not deviate from the meaning of this invention also belong to this invention.

Claims (5)

1. An electrically operated valve in which a cylindrical metallic valve body is assembled with a support member that supports a magnetic rotor of a motor section and a rotor shaft on an axis, and a cylindrical metallic sealed housing that houses the magnetic rotor,

the above-mentioned electric valve is characterized in that,

the support member has a fixing metal fitting having a protruding surface protruding in a direction orthogonal to the axis line around the outer periphery of the axis line,

a first annular surface located inside a plane orthogonal to the axis and a second annular surface located outside the plane orthogonal to the axis are provided around the entire circumference of the axis at an opening end portion of the valve body, in which the support member is fitted, and the first annular surface and the second annular surface form a step portion so that positions in the direction of the axis are different from each other,

welding a portion of the valve body in contact with the first annular surface and the fixing metal fitting of the support member, and welding a portion of the valve body in contact with the second annular surface and the open end of the sealed case,

an upright surface connecting an outer edge of the first annular surface and an inner edge of the second annular surface in the axial direction opposes one of an end surface of the fixing metal piece at the outer edge thereof extending in the thickness direction of the fixing metal piece and an inner surface of the seal housing with a gap therebetween.

2. Electrically operated valve according to claim 1,

the fixing metal fitting has a sagging surface portion formed by press working of a sheet metal, and a back surface side of the sagging surface portion is brought into contact with the first annular surface and a portion in contact therewith is welded.

3. Electrically operated valve according to claim 2,

the fixing metal fitting has an asymmetrical shape with respect to a plane orthogonal to the axis.

4. Electrically operated valve according to claim 3,

the support member has a resin base portion press-fitted into the opening end portion of the valve main body,

the fixing metal fitting has a cylindrical edge centered on the axis, and a flange portion having a protruding surface protruding in a direction orthogonal to the axis L on the outer periphery of the edge,

the fixing metal fitting is disposed in the base portion such that the edge is located inside the valve body, and is insert-molded together with the base portion.

5. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve and an evaporator,

the above-described refrigeration cycle system is characterized in that,

use of an electrically operated valve according to any of claims 1 to 4 as the expansion valve.

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