JP7048109B2 - Electrical drive valve and its manufacturing method - Google Patents

Description

The present invention relates to an electrically driven valve and a method for manufacturing the same.

Patent Document 1 discloses a solenoid valve as a conventional electrically driven valve. The solenoid valve of Patent Document 1 has a cylindrical valve body having one end closed, a seat member joined to the other end of the valve body, and a valve housed in the valve body and separated from the valve seat of the seat member. Has a body.

Japanese Unexamined Patent Publication No. 2013-185603

The solenoid valve of Patent Document 1 has a columnar valve body formed by cutting a brass material. As a result, material costs and processing costs are high, leading to an increase in the manufacturing cost of solenoid valves.

Therefore, an object of the present invention is to provide an electrically driven valve and a method for manufacturing the same, which can reduce the manufacturing cost by suppressing the material cost and the processing cost of the valve body.

In order to achieve the above object, the electrically driven valve according to one aspect of the present invention includes a valve body having a valve chamber and a valve opening, a cylindrical case attached to the valve body, and the inside of the case. An electrically driven valve having a plunger arranged so as to be movable in the axial direction and a valve body that is moved forward and backward with respect to the valve opening by the plunger, and the valve body is formed by metal pressing. It has a cylindrical main body portion and a ring plate-shaped or disc-shaped valve portion connected to one end of the main body portion, and the plunger comes into contact with the outer peripheral surface of the case. It has a cylindrical plunger main body and a cylindrical valve body mounting portion having a diameter smaller than that of the plunger main body, which is connected to one end of the plunger main body, and the valve body mounting portion is the valve body. It is characterized in that it is inserted into the other end of the main body portion.

According to the present invention, the valve body is formed by metal stamping. As a result, the material cost and the processing cost can be suppressed as compared with the electric drive valve having the structure in which the valve body is formed by cutting. Therefore, the material cost and the processing cost of the valve body can be suppressed, and the manufacturing cost of the electrically driven valve can be reduced. Further, the valve body mounting portion of the plunger is inserted into the other end of the main body portion of the valve body. This allows the valve body to be easily attached to the plunger.

In the present invention, the valve body further has a radially outwardly projecting protrusion connected to the other end of the main body portion, and the protrusion is the plunger main body and the valve of the plunger. A direction in which the electrically driven valve is abutted against a valve body propulsion surface provided between the body mounting portion, the valve body is arranged between the valve body and the protrusion, and the valve body is separated from the valve opening. Has a compression coil spring that pushes into . In this way, the compression coil spring presses the valve body against the plunger. Therefore, it is not necessary to fix the valve body to the plunger by welding or caulking, so that the manufacturing cost can be further reduced.
In the present invention, the electrically driven valve has an electromagnetic coil, the valve body has a valve seat arranged so as to surround the valve opening, and the electromagnetic coil is not energized. A state in which the plunger and the valve body are pushed by the compression coil spring and move in a direction away from the valve seat, the valve portion is separated from the valve seat to open the valve, and the electromagnetic coil is energized. In, the plunger and the valve body move in a direction approaching the valve seat against the compression coil spring, the valve portion comes into contact with the valve seat, and the valve is closed. It is preferable that the length in the axial direction is longer than the distance from the valve open position to the valve closed position of the valve body.

In the present invention, a flow hole is provided in the valve body so that a fluid flows from the valve chamber of the valve body through the inside of the valve body to the valve port in the closed state where the valve port is closed. It is preferable that a flow rate limiting member for limiting the flow rate of the passing fluid is provided inside the valve body. By doing so, a small amount of fluid can flow through the inside of the valve body in the closed state. As a result, the electrically driven valve can prevent a change in the flow rate due to wear of the valve seat, as compared with a configuration in which a bleed groove is provided in the valve seat surrounding the valve opening.

In order to achieve the above object, the method for manufacturing an electrically driven valve according to another aspect of the present invention includes a valve body having a valve chamber and a valve opening, a cylindrical case attached to the valve body, and a cylindrical case. A method for manufacturing an electrically driven valve having a plunger disposed inside the case so as to be movable in the axial direction and a valve body that is moved forward and backward with respect to the valve opening by the plunger, which is a metal material. Is metal-pressed to form a cylindrical main body, an annular plate-shaped or disc-shaped valve portion connected to one end of the main body, and a radial direction connected to the other end of the main body. The valve body having a protrusion protruding outward is formed, and a metal material is machined to connect the cylindrical plunger body in which the outer peripheral surface contacts the case and one end of the plunger body. The plunger having a columnar valve body mounting portion having a diameter smaller than that of the plunger body and a valve body propulsion surface provided between the plunger body and the valve body mounting portion is formed. A compression coil spring is arranged inside the case so that one end abuts on the valve body, the main body portion of the valve body is inserted into the compression coil spring, and the compression coil spring is used with the valve body and the valve. The valve body mounting portion is arranged between the protrusion of the body and the other end of the main body of the valve body, and the protrusion of the valve body is inserted into the valve body propulsion surface of the plunger. It is characterized in that it is brought into contact with.

In the electrically driven valve of the present invention, the valve body is formed by metal stamping. From this, the electric drive valve of the present invention can reduce the material cost and the processing cost as compared with the electric drive valve having a structure in which the valve body is formed by cutting. Therefore, the material cost and the processing cost of the valve body can be suppressed, and the manufacturing cost of the electrically driven valve can be reduced. Further, in the electrically driven valve of the present invention, the valve body mounting portion of the plunger is inserted into the other end of the main body portion of the valve body. This allows the valve body to be easily attached to the plunger.

According to the present invention, the material cost and the processing cost of the valve body can be suppressed, and the manufacturing cost of the electrically driven valve can be reduced.

It is sectional drawing of the solenoid valve which concerns on one Example of the electric drive valve of this invention. It is an enlarged sectional view of the solenoid valve of FIG. It is an enlarged sectional view which shows the structure of the modification of the solenoid valve of FIG.

Hereinafter, the configuration of the solenoid valve according to the embodiment of the electrically driven valve of the present invention will be described with reference to FIGS. 1 to 3. The solenoid valve described herein has a configuration in which a small amount of refrigerant (fluid) flows in a closed state. The present invention can also be applied to a solenoid valve that completely stops the flow of the refrigerant in the closed state.

FIG. 1 is a cross-sectional view taken along the axial direction of a solenoid valve according to an embodiment of the electrically driven valve of the present invention. FIG. 2 is an enlarged cross-sectional view of the solenoid valve of FIG. FIG. 3 is an enlarged cross-sectional view showing the configuration of a modified example of the solenoid valve of FIG. In FIGS. 2 and 3, the description of the electromagnetic coil is omitted.

The solenoid valve 1 according to the present embodiment is a solenoid valve that drives a valve body by magnetic force, and is used, for example, as a dehumidifying valve that throttles the flow rate of refrigerant during the dehumidifying operation of an air conditioner.

As shown in FIG. 1, the solenoid valve 1 has a valve body 10, a case 20, a plunger 30, a cap 40, a valve body 50, a flow rate limiting member 60, and an electromagnetic coil 70. There is.

The valve body 10 is manufactured, for example, by cutting a brass material, an aluminum material, or the like. The valve body 10 is formed in a substantially columnar shape. The valve body 10 has a valve chamber 11, a valve opening 12 opening to the valve chamber 11, and a valve seat 13 arranged so as to surround the valve opening 12. The valve seat 13 is a conical tapered surface whose diameter gradually decreases from the upper side to the lower side facing inward in the radial direction. The upper surface 10a of the valve body 10 is provided with a case mounting hole 14 leading to the valve chamber 11. An annular spring receiving portion 15 projecting inward in the radial direction is provided on the inner peripheral surface of the case mounting hole 14. The first conduit 18 and the second conduit 19 are joined to the valve body 10 by brazing or the like. The first conduit 18 is arranged so as to extend in a direction orthogonal to the axis L. The first conduit 18 is connected to the valve chamber 11. The second conduit 19 is arranged so as to extend in the L direction of the axis. The second conduit 19 is connected to the valve port 12.

The case 20 is manufactured, for example, by cutting a non-magnetic (property that does not magnetize even when placed in a magnetic field) stainless steel circular tube. The case 20 is formed in a cylindrical shape. The lower end 21 of the case 20 is inserted into the case mounting hole 14 of the valve body 10. The lower end 21 of the case 20 is in contact with the spring receiving portion 15 of the valve body 10. The case 20 is joined to the valve body 10 by brazing or the like.

The plunger 30 is a movable iron core. The plunger 30 is manufactured, for example, by cutting a metal material such as a paramagnetic iron material (a property of being magnetized when placed in a magnetic field and being magnetized when the magnetic field is removed) or a stainless steel material. The plunger 30 integrally includes a plunger main body 31 and a valve body mounting portion 32. The plunger body 31 is formed in a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the case 20. The valve body mounting portion 32 is formed in a columnar shape having a diameter smaller than the outer diameter of the plunger main body 31. The valve body mounting portion 32 is continuously provided at the lower end (one end) of the plunger main body 31. A valve body propulsion surface 33, which is an annular plane facing downward, is provided between the plunger main body 31 and the valve body mounting portion 32. Inside the plunger body 31, a spacer 34 made of non-magnetic resin or the like is arranged. The spacer 34 is formed in the shape of an annular plate. The plunger 30 is arranged inside the case 20 so as to be movable in the axis L direction. The plunger 30 moves in the axis L direction while the outer peripheral surface of the plunger main body 31 is in contact with the inner peripheral surface of the case 20.

The cap 40 is a fixed iron core. The cap 40 is manufactured by cutting an iron material or a stainless steel material having paramagnetism. The cap 40 integrally has a columnar large-diameter portion 41 and a columnar small-diameter portion 42 coaxially connected to the lower end of the large-diameter portion. The large diameter portion 41 is arranged so as to close the upper end 22 of the case 20. The outer diameter of the small diameter portion 42 is smaller than the outer diameter of the large diameter portion 41. The small diameter portion 42 is inserted inside the plunger main body 31. The cap 40 is joined to the case 20 by welding. A gap is provided between the plunger 30 and the cap 40.

The valve body 50 is manufactured by metal stamping a metal material such as a non-magnetic stainless steel material. The valve body 50 integrally has a main body portion 51, a valve portion 52, and an annular protrusion 53. The main body 51 is formed in a cylindrical shape whose inner diameter is substantially the same as the outer diameter of the valve body mounting portion 32. The main body 51 has a distribution hole 51a. The valve portion 52 is formed in the shape of an annular plate. The outer peripheral edge of the valve portion 52 is continuously provided at the lower end (one end) of the main body portion 51. The valve portion 52 is provided with a seating surface 54. The seating surface 54 is a conical tapered surface whose diameter gradually decreases from the upper side to the lower side in the radial direction. The seating surface 54 is in contact with the valve seat 13 in the closed state. That is, in the valve closed state, the valve port 12 arranged inside the valve seat 13 is closed by the valve body 50. The inside of the inner peripheral edge of the valve portion 52 is a flow hole 52a. The protrusion 53 is continuously provided at the upper end (the other end) of the main body 51 so as to project outward in the radial direction. The protrusion 53 is in contact with the valve body propulsion surface 33 of the plunger 30. The valve body 50 is moved back and forth with respect to the valve opening 12 by the plunger 30.

A valve opening spring 55, which is a compression coil spring, is arranged between the spring receiving portion 15 of the valve body 10 and the protrusion 53 of the valve body 50. Inside the valve opening spring 55, the main body 51 of the valve body 50 is arranged. The valve opening spring 55 pushes the valve body 50 upward.

The flow rate limiting member 60 is arranged inside the valve body 50. The flow rate limiting member 60 has a holding member 61, a filter 62, a flow rate limiting plate 63, and a filter 64 that are laminated in order from top to bottom. The holding member 61 is formed in a cylindrical shape having an outer diameter substantially the same as the inner diameter of the main body 51 of the valve body 50. The holding member 61 sandwiches the filter 62, the flow rate limiting plate 63, and the filter 64 between the holding member 61 and the valve portion 52. The holding member 61 is fixed to the inside of the main body 51. The filters 62 and 64 are configured by, for example, densely laminating a mesh material made of a metal wire having a fine diameter. The filters 62 and 64 may be made of a porous material produced by metal sintering. The filter 62 is arranged adjacent to the flow hole 51a. The filter 64 is arranged adjacent to the flow hole 52a. The flow rate limiting plate 63 is arranged so as to partition the space inside the valve body 50 in the L direction of the axis. The flow rate limiting plate 63 has a small-diameter through hole that allows a small amount of refrigerant to flow.

In the solenoid valve 1, in the closed state, the refrigerant flows from the valve chamber 11 through the flow hole 51a into the inside of the valve body 50, passes through the inside of the valve body 50, and flows out from the flow hole 52a to the valve port 12. do. Then, when the refrigerant passes through the inside of the valve body 50, the flow rate through which the flow rate limiting member 60 passes is limited.

The electromagnetic coil 70 has a housing 71, a bobbin 72 housed in the housing 71, and a coil 73 composed of an electric wire wound around the bobbin 72. The electromagnetic coil 70 is formed in a substantially cylindrical shape, and a case 20 is fitted inside. The electromagnetic coil 70 is fixed to the cap 40 by bolts 74.

The solenoid valve 1 includes a valve body 10 (valve port 12, valve seat 13), a case 20, a plunger 30 (plunger body 31, valve body mounting portion 32), a cap 40 (large diameter portion 41, small diameter portion 42) and Each axis of the valve body 50 (main body 51, valve 52, protrusion 53) is arranged so as to coincide with the axis L. That is, they are all arranged coaxially. The axis L direction coincides with the vertical direction of each figure.

Next, an example of the manufacturing method of the solenoid valve 1 according to this embodiment will be described.

A metal material such as brass or aluminum is machined to form the valve body 10.

The case 20 is formed by cutting a circular stainless steel tube.

The stainless steel material is machined to form a plunger 30 having a cylindrical plunger main body 31 and a cylindrical valve body mounting portion 32 connected to the lower end of the plunger main body 31.

A stainless steel plate is metal-pressed to form a cylindrical main body 51, a valve 52 connected to the lower end of the main body 51, and a protrusion 53 connected to the upper end of the main body 51. The valve body 50 to have is formed.

The first conduit 18, the second conduit 19 and the case 20 are brazed to the valve body 10.

A valve opening spring 55 is arranged inside the case 20 so that the lower end abuts on the spring receiving portion 15. The main body 51 of the valve body 50 is inserted into the valve opening spring 55, and the valve opening spring 55 is arranged between the spring receiving portion 15 of the valve main body 10 and the protrusion 53 of the valve body 50. The valve body mounting portion 32 of the plunger 30 is inserted into the other end of the main body portion 51 of the valve body 50. The spacer 34 is arranged inside the plunger body 31.

The small diameter portion 42 of the cap 40 is arranged inside the plunger main body 31, and the large diameter portion 41 of the cap 40 is welded to the upper end 22 of the case 20.

Then, the case 20 is fitted inside the electromagnetic coil 70. The electromagnetic coil 70 is fastened to the cap 40 with a bolt 74. In this way, the solenoid valve 1 is completed.

Next, an example of the operation of the solenoid valve 1 described above will be described.

When the coil 73 of the solenoid valve 1 is not energized (when not energized), the plunger 30 and the valve body 50 are pushed by the valve opening spring 55 and move upward. The plunger 30 abuts on the small diameter portion 42 of the cap 40 via the spacer 34. The seating surface 54 of the valve portion 52 of the valve body 50 is separated from the valve seat 13 to open the valve. In the valve open state, the valve opening 12 is open, and the refrigerant can freely flow between the first conduit 18 and the second conduit 19 through the valve chamber 11 and the valve opening 12.

When the coil 73 of the solenoid valve 1 is energized (when energized), the plunger 30 and the cap 40 are magnetized by the magnetic field generated by the coil 73. As a result, the plunger 30 and the valve body 50 move downward against the valve opening spring 55. Then, the seating surface 54 of the valve portion 52 of the valve body 50 comes into contact with the valve seat 13 to close the valve. In the valve closed state, the valve port 12 is closed, and a small amount of refrigerant passes through the inside of the valve body 50 and flows from the valve chamber 11 to the valve port 12. In the closed state, the flow of the refrigerant between the first conduit 18 and the second conduit 19 is restricted.

From the above, in the solenoid valve 1 of this embodiment, the valve body 50 is formed by metal stamping. Therefore, the solenoid valve 1 can reduce the material cost and the processing cost as compared with the solenoid valve having a structure in which the valve body is formed by cutting. Therefore, the material cost and the processing cost of the valve body 50 can be suppressed, and the manufacturing cost of the solenoid valve 1 can be reduced. Further, in the solenoid valve 1, the valve body mounting portion 32 of the plunger 30 is inserted into the upper end of the main body portion 51 of the valve body 50. As a result, the valve body 50 can be easily attached to the plunger 30.

Further, the valve body 50 has a protrusion 53 connected to the upper end of the main body 51 and projecting outward in the radial direction. The protrusion 53 is in contact with the valve body propulsion surface 33 of the plunger 30. The solenoid valve 1 is arranged between the spring receiving portion 15 of the valve body 10 and the protrusion 53 of the valve body 50, and a valve opening spring 55 that pushes the valve body 50 upward so as to be away from the valve opening 12. Have. By doing so, in the solenoid valve 1, the valve body 50 can be pressed against the plunger 30 by the valve opening spring 55. Therefore, in the solenoid valve 1, it is not necessary to fix the valve body 50 to the plunger 30 by welding, caulking, or the like, so that the manufacturing cost can be further reduced.

Further, the flow holes 51a and 52a are provided in the valve body 50 so that the fluid flows from the valve chamber 11 of the valve body 10 through the inside of the valve body 50 to the valve port 12 in the closed state where the valve port 12 is closed. It is provided. A flow rate limiting member 60 that limits the flow rate of the passing fluid is provided inside the valve body 50. By doing so, a small amount of fluid can flow through the inside of the valve body 50 in the valve closed state, so that the flow rate of the refrigerant due to wear of the valve seat 13 is compared with the configuration in which the bleed groove is provided in the valve seat 13. Can be prevented from changing.

Further, in the solenoid valve 1, the length L1 in the axis L direction of the valve body mounting portion 32 of the plunger 30 (that is, the length in the axis L direction from the lower end of the plunger 30 to the valve body propulsion surface 33) is the valve body. The distance from the valve open position to the valve closed position of 50 is longer than L2. By doing so, even if the valve body 50 remains in contact with the valve seat 13 for some reason and only the plunger 30 moves upward, the main body 51 of the valve body 50 remains in contact with the plunger 30. It is possible to prevent the valve body mounting portion 32 from falling off.

In the above-mentioned solenoid valve 1, only the valve body mounting portion 32 of the plunger 30 is inserted into the other end of the main body portion 51 of the valve body 50, and the valve body 50 and the plunger 30 are not fixed. .. In the solenoid valve 1, a configuration in which the valve body 50 and the plunger 30 are joined by welding or the like may be adopted. In this case, the protrusion 53 may be omitted, and the valve opening spring 55 may be arranged between the spring receiving portion 15 and the valve body propulsion surface 33 of the plunger 30.

Further, in the above-mentioned solenoid valve 1, a small amount of refrigerant passes through the inside of the valve body 50 in the closed state. In addition to this, for example, as in the solenoid valve 1A shown in FIG. 3, a small amount of refrigerant may be allowed to flow through a plurality of bleed grooves 13a provided in the valve seat 13 in the valve closed state. The solenoid valve 1A does not have the flow rate limiting member 60. The valve body 50 of the solenoid valve 1A has a disk-shaped valve portion 52A instead of the disk-shaped valve portion 52. The valve body 10 of the solenoid valve 1A has an annular support portion 16 projecting inward in the radial direction and a guide 17 supported by the support portion 16 in place of the spring receiving portion 15. The guide 17 integrally has an annular plate-shaped spring receiving portion 17a and a cylindrical guide portion 17b connected to the inner peripheral edge of the spring receiving portion 17a. The spring receiving portion 17a is sandwiched between the support portion 16 and the lower end 21 of the case 20. The lower end of the valve opening spring 55 is in contact with the spring receiving portion 17a. The inner diameter of the guide portion 17b is slightly larger than the outer diameter of the main body portion 51 of the valve body 50. The main body 51 of the valve body 50 is inserted through the guide portion 17b.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-mentioned embodiments, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.

1, 1A ... Solenoid valve, 10 ... Valve body, 11 ... Valve chamber, 12 ... Valve opening, 13 ... Valve seat, 13a ... Bleed groove, 14 ... Case mounting hole, 15 ... Spring receiving part, 16 ... Support part, 17 ... guide, 17a ... spring receiving part, 17b ... guide part, 18 ... first conduit, 19 ... second conduit, 20 ... case, 21 ... lower end, 22 ... upper end, 30 ... plunger, 31 ... plunger body, 32 ... Valve body mounting part, 33 ... Valve body propulsion surface, 34 ... Spacer, 40 ... Cap, 41 ... Large diameter part, 42 ... Small diameter part, 50 ... Valve body, 51 ... Main body part, 51a ... Flow hole, 52, 52A ... Valve portion, 52a ... Flow hole, 53 ... Protrusion, 54 ... Seating surface, 55 ... Valve opening spring, 60 ... Flow limiting member, 61 ... Holding member, 62, 64 ... Filter, 63 ... Flow limiting plate, 70 ... Solenoid coil, 71 ... Housing, 72 ... Bobin, 73 ... Coil, 74 ... Bolt

Claims (4)

A valve body having a valve chamber and a valve port, a cylindrical case attached to the valve body, a plunger arranged so as to be movable in the axial direction inside the case, and the plunger to the valve port. An electrically driven valve having a valve body that moves forward and backward and a compression coil spring .
The valve body is formed by metal stamping, and has a cylindrical main body portion, an annular plate-shaped or disc-shaped valve portion connected to one end of the main body portion, and the other end of the main body portion. Has a protrusion that protrudes outward in the radial direction, which is connected to the
The plunger has a cylindrical plunger body whose outer peripheral surface is in contact with the case, and a cylindrical valve body mounting portion having a diameter smaller than that of the plunger body, which is connected to one end of the plunger body. ,
The valve body mounting portion is inserted into the other end of the main body portion of the valve body, and the valve body mounting portion is inserted .
The protrusion is brought into contact with a valve body propulsion surface provided between the plunger body of the plunger and the valve body mounting portion.
An electrically driven valve in which the compression coil spring is arranged between the valve body and the protrusion and pushes the valve body in a direction away from the valve opening . The electrically driven valve has an electromagnetic coil and
The valve body has a valve seat arranged so as to surround the valve opening.
In a state where the electromagnetic coil is not energized, the plunger and the valve body are pushed by the compression coil spring and move in a direction away from the valve seat, and the valve portion is separated from the valve seat and opened. become,
In a state where the electromagnetic coil is energized, the plunger and the valve body move in a direction approaching the valve seat against the compression coil spring, and the valve portion is in contact with the valve seat and is in a closed state. become,
The electrically driven valve according to claim 1 , wherein the length of the valve body mounting portion in the axial direction is longer than the distance from the valve open position to the valve closed position of the valve body . A flow hole is provided in the valve body so that the fluid flows from the valve chamber of the valve body through the inside of the valve body to the valve port in the closed state where the valve port is closed.
The electrically driven valve according to claim 1 or 2, wherein a flow rate limiting member for limiting the flow rate of the flowing fluid is provided inside the valve body. A valve body having a valve chamber and a valve port, a cylindrical case attached to the valve body, a plunger arranged so as to be movable in the axial direction inside the case, and the plunger to the valve port. It is a method of manufacturing an electrically driven valve having a valve body that moves forward and backward.
The metal material was stamped with a metal to form a cylindrical main body, an annular plate-shaped or disc-shaped valve portion connected to one end of the main body, and a continuous connection to the other end of the main body. Forming the valve body having a protrusion protruding outward in the radial direction,
A cylindrical plunger body in which the outer peripheral surface is in contact with the case by cutting a metal material, and a cylindrical valve body mounting portion having a diameter smaller than that of the plunger body connected to one end of the plunger body. The plunger having a valve body propulsion surface provided between the plunger main body and the valve body mounting portion is formed.
A compression coil spring is arranged inside the case so that one end abuts on the valve body.
The main body of the valve body is inserted into the compression coil spring, and the compression coil spring is placed between the valve body and the protrusion of the valve body.
The electric drive is characterized in that the valve body mounting portion is inserted into the other end of the main body portion of the valve body, and the protrusion portion of the valve body is brought into contact with the valve body propulsion surface of the plunger. How to make a valve.

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