JP2016056890A - Slide valve and refrigeration cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a leaf spring, in a selector valve in which in a valve housing, a connection plate is installed to a piston, a valve body is held to the connection plate, and the leaf spring is interposed between the connection plate and the valve body.SOLUTION: A swollen part 51 of a valve body 5 is fitted to a valve body fitting hole 4a of a connection plate 4. A flange part 52 in the outer periphery of the swollen part 51 is opposite to the connection plate 4. A projection part 52a is provided outside a leaf spring 6 at the end part of the flange part 52. With application of back pressure to the valve body 5, even when the valve body 5 separates from a valve seat 2, the projection part 52a contacts with the connection plate 4. Consequently, a compression amount of a spring part 61 of the leaf spring 6 is regulated. The projection part may be provided on the side of the connection plate 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a slide valve and a refrigeration cycle for switching a refrigerant flow path such as a heat pump refrigeration cycle.

  Conventionally, as this type of slide valve, for example, there is one disclosed in Japanese Patent No. 5275947 (Patent Document 1). This slide valve is a switching valve, and has a cylindrical valve body. A high-pressure pipe into which high-pressure refrigerant flows from the compressor, a low-pressure pipe through which low-pressure refrigerant flows out to the compressor, A pair of conduits connected to the heat exchanger are connected to both sides of the tube. A pair of reciprocating pistons are accommodated in the valve body, and these pistons define a high pressure chamber on the inner side and a low pressure chamber on both outer sides thereof. In addition, a connecting plate is installed between the pistons, and a hook-shaped valve body having a hook portion is disposed. Further, a leaf spring for biasing the valve body toward the valve seat is interposed between the connecting plate and the flange portion of the valve body. Then, the piston is moved by the differential pressure between the high pressure chamber and the low pressure chamber and the connecting plate, and the valve body is slid on the valve seat to switch the refrigerant flow path.

Japanese Patent No. 5275947

  In the thing of patent document 1, the airtightness of the high pressure chamber in a valve main body and the inner side space of a valve body can be maintained by the urging | biasing force of the leaf | plate spring interposed between the connection plate and the collar part of the valve body. However, with this conventional structure, there is a risk that the leaf spring will be damaged, particularly when used for a long period of time. For example, during normal use, the valve body is pressed against the valve seat by the pressure in the high-pressure chamber in the valve body, but when the compressor is stopped or the valve body is moved and switched, the pressure relationship is different from normal. Back pressure may be applied to the valve body. When reverse pressure is applied to the valve body, the flange portion of the valve body is pressed against the connecting plate, and the leaf spring is sandwiched between the connecting plate and the flange portion and excessively compressed. If this is repeated, the leaf spring may be damaged.

  The present invention has been made to solve the above-described problems, and in a slide valve in which a valve body is urged toward a valve seat by a leaf spring, the leaf spring is prevented from being over-compressed. An object is to improve the durability of the spring.

  The slide valve according to claim 1 includes a valve seat that opens a port with respect to a cylindrical valve chamber, a pair of opposed pistons that reciprocate in the valve chamber, and a connecting plate that is laid between the pistons. A valve body that is held in the valve body fitting hole of the connection plate and has an outer flange portion disposed opposite to the connection plate; and the valve body is interposed between the connection plate and the flange portion. A slide spring for controlling the flow of fluid passing through the port of the valve seat by sliding the valve body on the valve seat by the piston, and a leaf spring biased toward the valve seat; Stopper means for restricting the amount of compression of the leaf spring is provided.

  A slide valve according to a second aspect is the slide valve according to the first aspect, wherein the stopper means is a convex portion protruding from the flange portion toward the connecting plate.

  A slide valve according to a third aspect is the slide valve according to the first aspect, wherein the stopper means is a convex portion protruding from the connecting plate toward the flange portion.

  A slide valve according to claim 4 is the slide valve according to any one of claims 1 to 3, wherein a plurality of ports are opened in the valve seat, and the valve body is fitted to the valve body of the connecting plate. It has a bulging part fitted in the hole, and the flow of fluid passing through the port of the valve seat is switched by a conduction path inside the bulging part of the valve body.

  A slide valve according to a fifth aspect is the slide valve according to the fourth aspect, wherein the slide valve has a first port connected to the valve chamber, and the valve seat has a second port and a second port as the plurality of ports. 3 ports are formed, and a fourth port is formed between the second port and the third port, and the valve body is moved to move the first port to the valve chamber. The third port or the second port that is closed with respect to the valve chamber is electrically connected to the second port or the third port that is opened, and the fourth port is closed by the conduction path of the valve body. It is characterized in that it conducts to the other port.

  A refrigeration cycle according to claim 6 is a refrigeration cycle comprising the slide valve according to claim 5, wherein the first port of the slide valve is connected to a discharge port of a compressor, and the fourth port is It is connected to a suction port of a compressor, and one of the second port and the third port is connected to an outdoor unit, and the other is connected to an indoor unit.

  According to the slide valve of claim 1, even if a reverse pressure is applied to the valve body and the leaf spring interposed between the connecting plate and the flange portion of the valve body is compressed, the leaf spring is provided by the stopper means. Since the compression amount of the leaf spring is restricted, excessive compression of the leaf spring is prevented, and the durability of the leaf spring is improved.

  According to the slide valve of the second aspect, in addition to the effect of the first aspect, since the stopper means is a convex portion provided on the flange portion, the structure is simplified.

  According to the slide valve of the third aspect, in addition to the effect of the first aspect, since the stopper means is a convex portion provided on the connecting plate, the structure is simplified.

  According to the slide valve of the fourth aspect, similarly to the first to third aspects, a reverse pressure is applied to the valve body, and the leaf spring interposed between the connecting plate and the flange portion of the valve body is compressed. However, since the compression amount of the leaf spring is regulated by the stopper means, the leaf spring is prevented from being over-compressed, and the durability of the leaf spring is improved.

  According to the slide valve of claim 5, in addition to the effect of claim 4, a high-pressure fluid is allowed to flow from the first port to the second port or the third port, and the other third port or second The port can be configured as a four-way switching valve that selectively conducts to the fourth port on the low pressure side.

  According to the refrigeration cycle of the sixth aspect, the refrigeration cycle having high reliability can be obtained by the same effect as that of the fifth aspect.

It is a figure which shows the switching valve and refrigeration cycle as a slide valve of 1st Embodiment of this invention. It is a top view (Drawing 2 (A)) and a partial crushing side view (Drawing (B)) of a valve element in a change-over valve as a slide valve of a 1st embodiment of the present invention. It is a perspective view of the leaf | plate spring in embodiment of this invention. It is a figure explaining the compression amount of the leaf | plate spring in 1st Embodiment of this invention. It is a top view (Drawing 5 (A)) and a partial crushing side view (Drawing 5 (B)) of a valve element in a change-over valve as a slide valve of a 2nd embodiment of the present invention. It is a figure which shows the switching valve as a slide valve of 3rd Embodiment of this invention. It is a figure which shows the slide valve of 4th Embodiment of this invention.

  Next, an embodiment of the present invention will be described. FIG. 1 is a diagram showing a switching valve and a refrigeration cycle as a slide valve according to the first embodiment of the present invention, and FIG. 2 is a plan view of a valve body in the switching valve as a slide valve according to the first embodiment (FIG. 2A). ) And a partially crushed side view (FIG. 2B). The switching valve 10 according to this embodiment is a four-way switching valve, and the switching valve 10 is switched by a pilot valve 20 as described later. The switching valve 10 includes a valve seat 2, a pair of pistons 3, 3, a connecting plate 4, a valve body 5, and a leaf spring 6 in the valve housing 1.

  The valve housing 1 includes a cylindrical cylindrical portion 11 and two cap portions 12 and 12. The cap parts 12, 12 are each attached to the cylindrical part 11 by welding or the like so as to close the end of the cylindrical part 11, and the central axis of the cylindrical part 11 and the cap parts 12, 12 becomes the axis L of the valve housing 1. ing. The valve seat 2 is disposed at an intermediate portion in the cylindrical portion 11, and a D port 11 a that opens into the cylindrical portion 11 is formed at a position facing the valve seat 2 in the intermediate portion of the cylindrical portion 11. A D joint pipe 13d is attached to the D port 11a. The D port 11a corresponds to a “first port”.

  The valve seat 2 is formed with an E port 2a, an S port 2b, and a C port 2c aligned in a straight line in the axis L direction of the valve housing 1, and these E port 2a, S port 2b, and C port 2c include E joint pipe 13a, S joint pipe 13b, and C joint pipe 13c are attached, respectively. In the valve seat 2, the C port 2c corresponds to the “second port”, the E port 2a corresponds to the “third port”, and the S port 2b corresponds to the “fourth port”.

  The pair of pistons 3, 3 are arranged opposite to each other, and each holds a spring 33 and a packing 34 by a fixed disk 31 and a stopper plate 32, and the pistons 3, 3 hold the packing 34 of the cylindrical portion 11. It is possible to reciprocate while pressing against the inner peripheral surface. Thereby, the inside of the valve housing 1 is partitioned by the two pistons 3 and 3 into a main valve chamber 11A in the center and two sub valve chambers 12A and 12A on both sides of the main valve chamber 11A.

  The connecting plate 4 is made of a metal plate, and the connecting plate 4 is installed between the pistons 3 and 3 so as to be disposed on the axis L of the valve housing 1. Further, a valve body fitting hole 4a is formed at the center of the connecting plate 4, and through holes 4b and 4c are formed on both sides thereof. A valve body 5 is fitted into the valve body fitting hole 4 a, and the valve body 5 is held with a slight gap in the axis L direction with respect to the connecting plate 4. When the pistons 3 and 3 move, the valve body 5 slides on the valve seat 2 in conjunction with the connecting plate 4 and stops at predetermined left and right positions.

  As will be described later, the valve body 5 is formed with a flange-like recess 51 </ b> A as a “conduction path” inside the bulging portion 51. And the valve body 5 conduct | electrically_connects S port 2b and E port 2a by the hook-shaped recessed part 51A in the edge part position of the left side of FIG. At this time, the C port 2c is electrically connected to the D port 11a through the through hole 4c in the main valve chamber 11A. Further, the valve body 5 conducts the S port 2b and the C port 2c through the hook-shaped recess 51A at the end position on the right side in FIG. At this time, the E port 2a is electrically connected to the D port 11a through the through hole 4b in the main valve chamber 11A.

  The D port 11a is connected to the discharge port of the compressor 30 by the D joint pipe 13d and the high pressure pipe 14a, and the S port 2b is connected to the suction port of the compressor 30 by the S joint pipe 13b and the low pressure pipe 14b. The C port 2c is connected to the outdoor unit 40 by a C joint pipe 13c and a conduit 14c, and the E port 2a is connected to the indoor unit 50 by an E joint pipe 13a and a conduit 14d. The outdoor unit 40 and the indoor unit 50 are connected to each other by a conduit 14e through a throttle device 60. A refrigeration cycle is constituted by a path including the outdoor unit 40, the expansion device 60, the indoor unit 50, and the E joint pipe 13a from the C joint pipe 13c, and a path including the compressor 30 and the D joint pipe 13d from the S joint pipe 13b. Has been.

  The pilot valve 20 is connected to the switching valve 10 by conduits 14f, 14g, 14h, and 14i. The pilot valve 20 has a structure similar to that of the switching valve 10, for example, and switches the flow path by moving the valve body by an electromagnetic actuator or the like. The pilot valve 20 connects the connection destination of the conduit 14g communicating with the S joint pipe 13b of the switching valve 10 to the conduit 14h communicating with the left auxiliary valve chamber 12A and the right auxiliary valve chamber 12A. At the same time, the connection destination of the conduit 14f communicating with the D joint pipe 13d of the switching valve 10 is switched between the conduit 14i and the conduit 14h. That is, with respect to the left and right auxiliary valve chambers 12A and 12A of the switching valve 10, the state of reducing one pressure and setting the other to a high pressure is switched between the auxiliary valve chambers 12A and 12A. As a result, the pressure difference between the reduced pressure in the sub valve chamber 12A and the high pressure in the main valve chamber 11A is applied to the piston 3 on the sub valve chamber 12A side. Thereby, the piston 3, the connecting plate 4, and the valve body 5 are moved, the position of the valve body 5 is switched, and the flow path of the refrigeration cycle is switched.

  The high-pressure refrigerant compressed by the compressor 30 flows into the main valve chamber 11A from the D joint pipe 13d via the D port 11a, and in the cooling operation state of FIG. 1, the high-pressure refrigerant passes from the C port 2c to the outdoor unit 40. Is flowed into. Further, in the heating operation state in which the valve body 5 is switched, the high-pressure refrigerant flows into the indoor unit 50 from the E port 2a. That is, during the cooling operation, the refrigerant discharged from the compressor 30 circulates from the C joint pipe 13c → the outdoor unit 40 → the expansion device 60 → the indoor unit 50 → the E joint pipe 13a, and the outdoor unit 40 is a condenser (condenser), The indoor unit 50 functions as an evaporator (evaporator) and is cooled. Further, during the heating operation, the refrigerant is circulated in reverse, and the indoor unit 50 functions as a condenser and the outdoor unit 40 functions as an evaporator, and heating is performed. “C” and “E” of the C port 2c and the E port 2a are names based on the cooling operation.

  As shown in FIG. 2, the valve body 5 is molded into a bowl shape by a resin member, and has a bulging portion 51 and a flange portion 52 formed on the outer periphery of the bulging portion 51. ing. The flange 51 </ b> A is formed by the inside of the bulging portion 51. In addition, a connecting portion of the bulging portion 51 with the flange portion 52 is a substantially rectangular base portion 51 a, and the base portion 51 a is fitted in the valve body fitting hole 4 a of the connecting plate 4. Convex portions 52 a and 52 a as “stopper means” projecting toward the connecting plate 4 are formed at both ends of the flange portion 52 in the axis L direction.

  As shown in FIG. 3, the leaf spring 6 is formed in a ring shape having a rectangular shape in plan view by pressing a stainless steel plate, and spring portions 61, 61 having a V-shape in side view are provided at end portions in the axis L direction. Have. The spring portions 61 and 61 are connected by connecting portions 62 and 62. Moreover, the inner side of the spring parts 61 and 61 and the connection parts 62 and 62 is an opening 6a, and the base 51a of the valve body 5 is fitted into the opening 6a. And the leaf | plate spring 6 is interposed between the connection plate 4 and the collar part 52 inside the convex parts 52a and 52a of the both ends of the valve body 5. FIG. Accordingly, the leaf spring 6 biases the valve body 5 (the flange portion 52) toward the valve seat 2 with respect to the connecting plate 4 by the spring force of the spring portions 61 and 61.

  FIG. 4 is a view for explaining the amount of compression of the leaf spring 6 in the first embodiment. The connecting plate 4 and the leaf spring 6 indicated by solid lines indicate a state before assembly to the valve housing 1, and the connection plate 4 and the leaf spring 6 indicated by two-dot chain lines are assembled to the valve housing 1 and are leaf springs. 6 shows the state compressed to the maximum. 1 and 2 also show a state in which the leaf spring 6 is compressed to the maximum.

  The plate spring 6 can be compressed to a flat plate as a single unit, but in the assembled state, even if a reverse pressure is applied to the valve body 5, the convex portions 52 a and 52 a of the valve body 5 abut against the connecting plate 4. Therefore, compression is performed only to the maximum shown in the figure. That is, the leaf spring 6 always presses the valve body 5 against the valve seat 2 even if the connecting plate 4 is slightly displaced from the axis L due to deformation of the packing 34 of the piston 3 or is slightly inclined. Although it acts, the amount of compression is regulated so that it is not compressed beyond the maximum shown. Thereby, damage to the leaf spring 6 can be prevented.

  FIG. 5 is a plan view (FIG. 5 (A)) and a partially crushed side view (FIG. 5 (B)) of a valve body in a switching valve as a slide valve of the second embodiment. The same elements as those in the first embodiment and corresponding elements are denoted by the same reference numerals, and redundant description is omitted. In the valve body 5 of the second embodiment, convex portions 52b and 52b as "stopper means" are formed on both sides of the bulging portion 51 (base portion 51a) at the center of the flange portion 52 in the axis L direction. is there. The convex portions 52b and 52b are vertically long in the axis L direction. Therefore, even if a reverse pressure is applied to the valve body 5, the longitudinally protruding portions 52b and 52b abut against the connecting plate 4 so that the flange 52 is always parallel to the connecting plate 4 as shown in FIG. Similarly, the amount of compression is regulated so that the leaf spring 6 is not compressed more than the maximum. Thereby, damage to the leaf spring 6 can be prevented.

  FIG. 6 is a diagram showing a switching valve as a slide valve of the third embodiment, and the refrigeration cycle is the same as that of FIG. In the third embodiment, convex portions 41, 41 as “stopper means” are formed on the connecting plate 4. The leaf spring 6 is interposed between the connecting plate 4 and the flange portion 52 inside the convex portions 41, 41. Thereby, the leaf | plate spring 6 urges | biases the valve body 5 toward the valve seat 2 with respect to the connection plate 4 with the spring force of the spring parts 61 and 61 similarly to the said embodiment. As in the above embodiments, even if a reverse pressure acts on the valve body 5, the flange portion 52 of the valve body 5 abuts against the convex portions 41, 41, as in FIG. The compression amount is regulated so that the leaf spring 6 is not compressed more than the maximum. Thereby, damage to the leaf spring 6 can be prevented.

  Although the four-way switching valve has been described as an example in the first to third embodiments, the switching valve of the present invention can be configured as a three-way switching valve or a switching valve that switches among five or more ports.

  FIG. 7 is a view showing a slide valve according to a fourth embodiment of the present invention. The slide valve 100 is switched by the pilot valve 20. The slide valve 100 includes a valve seat 80, a pair of pistons 90 and 90, a connecting plate 8, a valve body 9, and a leaf spring 6 in a valve housing 70. The slide valve 100 has substantially the same structure as the switching valve 10 of the first embodiment except for the valve seat 80 and the valve body 9.

  The valve housing 70 includes a cylindrical cylindrical portion 71 and two cap portions 72 and 72. The cap portions 72 and 72 are each attached to the cylindrical portion 71 by welding or the like so as to close the end portion of the cylindrical portion 71, and the central axis of the cylindrical portion 71 and the cap portions 72 and 72 is the axis L of the valve housing 70. ing.

  The valve seat 80 is disposed at an intermediate portion in the cylindrical portion 71, and a port 71 a that opens into the cylindrical portion 71 is formed at a position facing the valve seat 80 in the intermediate portion of the cylindrical portion 71. A joint pipe 73a is attached to 71a. A port 80a is formed at the center of the valve seat 80, and a joint pipe 73b is attached to the port 80a.

  In the valve housing 70, a pair of pistons 90, 90 are arranged opposite to each other in the same manner as in the above embodiment, and the pistons 90, 90 can reciprocate within the cylindrical portion 11. Further, the inside of the valve housing 70 is partitioned by two pistons 90, 90 into a main valve chamber 71A at the center and two sub valve chambers 72A, 72A on both sides of the main valve chamber 71A.

  The connecting plate 8 is installed between the pistons 90 and 90 so as to be arranged on the axis L of the valve housing 70, and the valve body 9 is fitted in the valve body fitting hole 8 a of the connecting plate 8. When the pistons 90 and 90 move, the valve body 9 slides on the valve seat 80 in conjunction with the connecting plate 8 and stops at predetermined left and right positions.

  The valve body 8 includes a valve portion 91 and a flange portion 92 formed on the outer periphery of the valve portion 91. The valve portion 91 is formed with a conduction path 91a and a seal surface 91b. At both ends of the flange portion 92 in the axis L direction, convex portions 92a and 92a are formed as “stopper means” protruding toward the connecting plate 8 side.

  The leaf spring 6 is the same as that of the above embodiment except that the top and bottom are arranged upside down, and the operation is the same as that of the above embodiment. The leaf spring 6 is interposed between the connecting plate 8 and the flange 92 inside the convex portions 92 a and 92 a at both ends of the valve body 9. Accordingly, the leaf spring 6 biases the valve body 9 (the flange portion 92) toward the valve seat 80 with respect to the connecting plate 8 by the spring force of the spring portions 61 and 61.

  The pilot valve 20 is the same as that of the above embodiment, and the refrigerant pressure at the discharge port and the suction port of the compressor 30 depressurizes one of the left and right auxiliary valve chambers 72A and 72A of the slide valve 100 and The high pressure state is switched between the two auxiliary valve chambers 72A and 72A. Thereby, the piston 90, the connecting plate 8, and the valve body 9 are moved, and the position of the valve body 9 is switched.

  With the above configuration, the valve body 9 slides on the valve seat 80, and the valve body 9 seals the port 80a of the valve seat 80 with the sealing surface 91b at the left end position in FIG. It becomes a state. Further, the valve body 9 is connected to the port 80a of the valve seat 80 through the main valve chamber 71A through the conduction path 91a at the end position on the right side in FIG. During such operation, the leaf spring 6 biases the valve body 9 toward the valve seat 80 with respect to the connecting plate 8. As in the above-described embodiments, even if a reverse pressure is applied to the valve body 9, the protrusions 92 a and 92 a of the flange 92 abut against the connection plate 8, so that the flange 92 is connected to the connection plate. 8, the compression amount is regulated so that the leaf spring 6 is not compressed more than the maximum, as in FIG. Thereby, damage to the leaf spring 6 can be prevented. Note that in the slide valve of the fourth embodiment, similarly to the convex portions 41 and 41 of the connecting plate 4 in FIG. 6, the connecting plate 8 may be provided with a protruding portion that protrudes toward the flange 92.

  Moreover, although the slide valve of each embodiment has been described, the slide valve of the present invention can be configured as a three-way switching valve or a switching valve that switches among five or more ports.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. For example, the “stopper means” may be a separate member from the connecting plate 4 and the valve body 5. The “stopper means” may be a member formed by bending or winding a part of the leaf spring 6 at both ends of the leaf spring 6 (outer ends of the spring portions 61 and 61).

DESCRIPTION OF SYMBOLS 1 Valve housing 11 Cylindrical part 11A Main valve chamber 11a D port (1st port)
12 Cap part 12A Sub valve chamber 13a E joint pipe 13b S joint pipe 13c C joint pipe 13d D joint pipe 2 Valve seat 2a E port (third port)
2b S port (fourth port)
2c C port (second port)
3 Piston 4 Connecting plate 4a Valve body fitting hole 4b Through hole 4c Through hole 41 Projection (stopper means)
5 valve body 51 bulging part 51a base part 51A bowl-shaped recessed part (conduction path)
52 collar 52a convex part (stopper means)
52b Convex part (stopper means)
6 leaf spring 61 spring portion 62 connecting portion 6a opening L axis 10 switching valve 20 pilot valve 30 compressor 40 outdoor unit 50 indoor unit 60 throttle device

Claims (6)

A valve seat that opens a port with respect to the cylindrical valve chamber, a pair of opposed pistons that reciprocate in the valve chamber, a connecting plate that is laid between the pistons, and a valve body fitting of the connecting plate A valve body that is held in the joint hole and has an outer flange portion disposed opposite to the connection plate, and is interposed between the connection plate and the flange portion, and biases the valve body toward the valve seat. A slide valve that controls the flow of fluid passing through the port of the valve seat by sliding the valve body on the valve seat by the piston,
A slide valve characterized by comprising stopper means for regulating the compression amount of the leaf spring.   The slide valve according to claim 1, wherein the stopper means is a convex portion protruding from the flange portion toward the connecting plate.   The slide valve according to claim 1, wherein the stopper means is a convex portion protruding from the connecting plate toward the flange portion. A plurality of ports are opened in the valve seat, and the valve body has a bulging portion that is inserted into a valve body fitting hole of the connection plate,
The slide valve according to any one of claims 1 to 3, wherein the flow of fluid passing through the port of the valve seat is switched by a conduction path inside the bulging portion of the valve body.   A first port communicating with the valve chamber; and a second port and a third port as the plurality of ports formed in the valve seat; and the second port and the third port A fourth port is formed in the middle, and by moving the valve body, the first port is electrically connected to the second port or the third port that is open to the valve chamber, and 5. The slide valve according to claim 4, wherein the third port or the second port that is closed with respect to the valve chamber is connected to the fourth port through a conduction path of the valve body.   6. A refrigeration cycle comprising the slide valve according to claim 5, wherein the first port of the slide valve is connected to a discharge port of the compressor, and the fourth port is connected to a suction port of the compressor. One of the second port and the third port is connected to an outdoor unit, and the other is connected to the indoor unit.

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