JP4036171B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device that cools a heating element housed in a housing, an integrated circuit for an electronic computer, a transmission / reception modem that processes signals transmitted / received between a mobile phone and the nearest exchange, etc. In addition, the present invention is effective when applied to a cooling device that cools electrical equipment such as a transmission amplifier that amplifies radio waves transmitted to a mobile phone.

  FIG. 7 is a diagram schematically showing a conventional mobile phone base station cooling apparatus.

  Conventionally, a heat pipe type heat exchanger 10 that exchanges heat between the air inside the mobile phone base station and the air outside the mobile phone base station, and the indoor air that blows the air inside the mobile phone base station to the heat exchanger 10. When the mobile phone base station is completed in the mobile phone base station constituting the housing, the cooling unit including the outdoor air blower 12 for blowing the air outside the mobile phone base station to the air blower 11 and the heat exchanger, Or it was retrofitted just before completion.

  By the way, in recent years, with the miniaturization of the electric equipment in the mobile phone base station, the mobile phone base station itself has also become smaller, and the conventional cooling unit, that is, the air inside the mobile phone base station and the air outside the mobile phone base station. A heat pipe type heat exchanger that exchanges heat with the indoor air blower that blows air inside the mobile phone base station to the heat exchanger, and outdoor air that blows air outside the mobile phone base station to the heat exchanger In the case of a retrofit unit type cooling device in which a blower or the like is housed in a single casing, it is increasingly difficult to install it in a mobile phone base station that has been reduced in size.

  In view of the above, the present invention firstly provides a novel cooling device for a heating element different from the conventional one, and secondly, a cooling device that can be installed even in a mobile phone base station or the like that has been miniaturized. The purpose is to provide.

In order to achieve the above object, according to the present invention, in the first aspect of the present invention, the wall member (2a) having the housing (2) for housing the heating element (1) and constituting the housing (2) is provided. ) Is a double wall structure provided with an inside air passage (2b) through which the air inside the housing (2) flows and an outside air passage (2c) through which the air outside the housing (2) flows, and the inside air passage (2b) The partition member (2d) that separates the outside air passage (2c) from a material that can exchange heat between the air flowing through the inside air passage (2b) and the air flowing through the outside air passage (2c),
Furthermore, it is provided in at least one of the blower (3, 4) for blowing air to the inside air passage (2b) and the outside air passage (2c), and the inside air passage (2b) and the outside air passage (2c), and performs heat exchange. The fins (2g, 2h) are arranged on the downstream side of the air flow from the blowers (3, 4), and in the passage where the fins are provided, It is characterized by being scattered in a staggered pattern in the distribution direction .

As a result, the air in the housing (2) and the air outside the housing (2) exchange heat in this double wall structure, and heat is generated in the housing (2), that is, the heating element (1). Heat is dissipated outside the housing (2), so a conventional cooling unit, that is, a heat pipe heat exchanger that exchanges heat between the air inside the mobile phone base station and the air outside the mobile phone base station, A retrofit system in which an indoor air blower that blows air inside the mobile phone base station to the heat exchanger and an outdoor air blower that blows air outside the mobile phone base station to the heat exchanger are housed in one casing. The cooling device can be made smaller than the unit cooling device.
In addition, since the fins (2g, 2h) function as rectifying means for adjusting the flow of the blown air, the ventilation resistance in the inside air passage (2b) and the outside air passage (2c) becomes excessively large with respect to an increase in the amount of blown air. This can be suppressed. Therefore, since a sufficient amount of air can be secured, the amount of heat exchange in the cooling device, that is, the double wall structure portion can be increased.
Further, the fins (2g, 2h) are scattered in a zigzag pattern in the air flow direction, so that the fins (2g, 2h) can be formed in the air flow direction without increasing the cross-sectional area of the air passage. The increase in pressure loss due to the increase in fins (2 g, 2 h) can be suppressed while increasing the total surface area of.
In this case, the area of the area where the fin is present is equal to the area of the area where the fin is not present in the cross-sectional area of the passage where the fin is provided in the inside air passage (2b) and the outside air passage (2c). It is preferable.

The invention according to claim 3 is characterized in that the partition member (2d) is made of a metal mainly composed of aluminum.

The invention according to claim 4 is characterized in that the air flowing through the inside air passage (2b) and the air flowing through the outside air passage (2c) are configured to face each other.

  Thereby, it is possible to efficiently exchange heat between the air flowing through the inside air passage (2b) and the air flowing through the outside air passage (2c).

  The invention according to claim 5 is characterized in that the blowers (3, 4) are centrifugal blowers that blow out air in the outer diameter direction by centrifugal force.

  Thereby, high air blowing capability (air blowing pressure) can be obtained while reducing the size of the housing (2) that houses the air blowers (3, 4).

  The invention described in claim 6 is characterized by comprising control means for increasing the amount of air blown from the blower (3, 4) in response to a temperature rise in the housing (2).

  Thereby, it can suppress that the power consumption of an air blower (3, 4) increases unnecessarily, and the ventilation noise increases.

  In the invention according to claim 7, the fins (2g, 2h) are formed in a wave shape so as to have a large number of curved portions and connecting portions connecting the curved portions, and are arranged in the inside air passage (2b). The curved portion of the fin (2h) and the curved portion of the fin (2g) disposed in the outside air passage (2c) are joined to the partition member (2d) at the same position with the partition member (2d) interposed therebetween. It is characterized by that.

  Thereby, the heat transfer path from the fin (2h) arranged in the inside air passage (2b) to the fin (2g) arranged in the outside air passage (2c) is the fin (2h) arranged in the inside air passage (2b). And the curved portion of the fin (2g) disposed in the outside air passage (2c) are shorter than the case where the curved portion is displaced with the partition member (2d) interposed therebetween.

  Accordingly, the thermal resistance from the fin (2h) arranged in the inside air passage (2b) to the fin (2g) arranged in the outside air passage (2c) is reduced, so that the heat in the cooling device, that is, the double wall structure portion is reduced. The exchange amount can be increased.

  In the invention according to claim 8, the fin (2h) arranged in the inside air passage (2b) and the fin (2g) arranged in the outside air passage (2c) are corrugated fins having the same pitch dimension. It is characterized by.

The invention according to claim 9 is characterized in that the blower (3, 4) is housed in a position where it can be directly seen from the opening (2j) through which the heating element (1) is taken in and out.

  Thereby, the blower (3, 4) can be easily repaired or inspected.

In the invention according to claim 10, the partition member (2d) is the inside air passage and (2b) and the outside air passage (2c) is to be present alternately, characterized in that it is formed in the rectangle wave.

  Thereby, since the surface area of the partition member (2d), that is, the inside air passage (2b) and the outside air passage (2c) are alternately present, the air inside the housing (2) and the outside of the housing (2) Heat exchange area with air increases.

  Therefore, it is possible to increase the amount of heat exchange between the air inside the housing (2) and the air outside the housing (2) while suppressing an increase in size of the housing (2).

  Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.

(First embodiment)
For mobile phone base stations that cool heating elements such as communication devices such as transmission / reception modems that process signals sent and received between mobile phones and the nearest exchange, and transmission amplifiers that amplify radio waves transmitted to mobile phones The cooling device according to the present invention is applied to the cooling device.

  1 is an external perspective view of the cooling device according to the present embodiment, FIG. 2 is a perspective view of the cooling device according to the present embodiment, and FIG. 3 is a schematic diagram of the cooling device according to the present embodiment. is there.

As shown in FIGS. 1, 2, and 3, the communication device 1 that forms a heating element is housed in a hexahedron-shaped casing 2, and the wall member 2a constituting the casing 2 is shown in FIG. As shown, it has a double wall structure provided with an inside air passage 2b through which the air inside the housing 2 flows and an outside air passage 2c through which the air outside the housing 2 flows. And at least the inside air passage 2b and the outside air passage 2c The partition member 2d is configured by a material capable of exchanging heat between the air in the housing 2 flowing through the inside air passage 2b and the air outside the housing 2 flowing through the outside air passage 2c.

  In the present embodiment, the partition member 2d is made of a non-ferrous metal such as an alloy containing aluminum as a main component or an alloy containing copper as a main component.

  Incidentally, in this embodiment, the outer plate 2e that partitions the outside air passage 2c and the outside of the housing 2 and the inner plate 2f that partitions the inside air passage 2b and the inside of the housing 2 are also made of the same material as the partition member 2d. However, it is desirable that at least the outer plate 2e is made of a material that is highly heat-insulating and that is difficult to absorb solar radiation and is coated.

  Further, in the present embodiment, the air outside the housing 2 is moved upward from the lower side so that the air inside the housing 2 flowing through the inside air passage 2b and the air outside the housing 2 flowing through the outside air passage 2c are opposed to each other. The air in the housing 2 is circulated from the upper side toward the lower side.

  For this reason, in this embodiment, while providing the external air intake 3a which takes in the air outside the housing | casing 2 in the housing | casing 2, ie, the communication device 1, the lower side, and the external air blower 3 for the air ventilation outside the housing | casing 2 are provided. The inside air intake port 4 a for taking in the air in the housing 2 and the inside air blower 4 for blowing air in the housing 2 are provided on the housing 2, that is, above the communication device 1.

  Incidentally, the amount of air blown by the inside air blower 4 and the amount of air blown by the outside air blower 3 are based on the detected temperature of an inside air temperature sensor (not shown) that detects the temperature of the air in the housing 2, and an electronic control device (not shown). The electronic control device constituting the control means is linearly controlled according to the amount of increase of the air in the housing 2 and the outside air blower 3 in accordance with the amount of increase. When the temperature of the air in the housing 2 decreases, the air volume of the inside air blower 4 and the air volume of the outside air fan 3 are linearly reduced according to the amount of decrease.

  The outside air outlet 3b for discharging the air outside the housing 2 after heat exchange with the air inside the housing 2 to the outside of the housing 2, that is, outside the outside air passage 2c, is provided above the housing 2, that is, the communication device 1. The inside air discharge port 4b that is provided on the side and returns the air in the housing 2 that has exchanged heat with the air outside the housing 2 to the communication device 1 side is provided on the housing 2, that is, on the lower side of the communication device 1 It has been.

  In the present embodiment, as the inside air blower 4 and the outside air blower 3, a centrifugal fan (see JIS B 0132 No. 1004 or the like) that blows air in the outer diameter direction by centrifugal force is adopted, and from the rotation axis direction of the impeller. The sucked air is blown out to the outer diameter side of the impeller by centrifugal force.

  Further, in the inside air passage 2b, on the downstream side of the air flow from the inside air blower 4 and in the outside air passage 2c on the downstream side of the air flow from the outside air blower 3, the contact area with the air (heat transfer area) is increased to increase the housing. Fins 2g and 2h for promoting heat exchange between the air inside the body 2 and the air outside the housing 2 are provided. Of the inside air passage 2b and the outside air passage 2c, the portion where the fins 2g and 2h are provided is the housing. A heat exchanging unit configured to exchange heat between the air inside the body 2 and the air outside the housing 2 is configured.

  As shown in FIG. 4, both the fins 2 g and 2 h have a plurality of curved portions and connecting portions that connect the curved portions as viewed from the air flow direction, that is, the vertical direction in this embodiment. In addition, a louver (not shown) is formed in the joint portion by cutting and raising a part of the joint portion into an armor window shape.

  The louver suppresses the growth of the temperature boundary layer by disturbing the air flow in a meandering manner and improves the heat transfer coefficient. It is used for a condenser of a vehicle air conditioner and a radiator for a vehicle. It is similar to what is there.

  In addition, the fins 2g and 2h have the partition member 2d so that the curved portion of the fin 2h disposed in the inside air passage 2b and the curved portion of the fin 2g disposed in the outside air passage 2c are in the same position with the partition member 2d interposed therebetween. It is joined to.

  At this time, in the present embodiment, the fin pitch of the fins 2h arranged in the inside air passage 2b and the fin pitch of the fins 2g arranged in the outside air passage 2c are made equal, so the fin 2h arranged in the inside air passage 2b. The fins 2g arranged in the outside air passage 2c are line-symmetric with respect to the partition member 2d.

  Incidentally, in this embodiment, the fins 2g and 2h and the partition member 2d are joined by brazing. Here, “brazing” is a technique for joining so as not to melt the base material using brazing material or solder, as described in “connection / joining technology” (Tokyo Denki University Press). When joining using a filler material having a melting point of 450 ° C. or higher is called brazing, the filler material at that time is called brazing material, and when joining using a filler material having a melting point of 450 ° C. or less Is called soldering, and the filler material at that time is called solder.

  Further, as shown in FIG. 1, an opening 2j for inserting / removing the communication device 1 is provided on the front side of the housing 2, and the opening 2j is a removable panel (lid) 2k. Is blocked.

  The inside air blower 4 and the outside air blower 3 are housed in a position that can be directly seen from the opening 2 j in the housing 2.

  Next, the general operation of the cooling device according to this embodiment will be described.

  The amount of air blown by the inside air blower 4 and the amount of air blown by the outside air blower 3 are increased in accordance with the temperature rise of the air in the housing 2. And the ventilation volume of the external air blower 3 is reduced.

  As a result, the air in the housing 2 flowing through the inside air passage 2b and the air outside the housing 2 flowing through the outside air passage 2c are heat-exchanged with the partition member 2d interposed therebetween.

  It should be noted that most of the heat exchange between the air inside the housing 2 and the air outside the housing 2 is performed at a portion of the inside air passage 2b and the outside air passage 2c where the fins 2g and 2h are disposed.

  Next, features of the present embodiment will be described.

  In this embodiment, the wall member 2a constituting the housing 2 is formed as a double wall structure including an inside air passage 2b through which air inside the housing 2 flows and an outside air passage 2c through which air outside the housing 2 flows. The wall structure portion exchanges heat between the air inside the housing 2 and the air outside the housing 2 to radiate the heat inside the housing 2, that is, the heat generated in the communication device 1 to the outside of the housing 2. Cooling unit, that is, a heat pipe type heat exchanger that exchanges heat between air inside the mobile phone base station and air outside the mobile phone base station, and an indoor air blower that blows air inside the mobile phone base station to this heat exchanger In addition, the cooling device can be made smaller as compared with a retrofitted unit cooling device in which an outdoor air blower or the like for blowing air outside the mobile phone base station to the heat exchanger is housed in one casing. .

  Therefore, it is possible to obtain a cooling device that can easily cope with mobile phone base stations and the like that have become more compact.

  Further, in the present embodiment, the air inside the housing 2 and the air outside the housing 2 are opposed to each other, so that the temperature difference between the air inside the housing 2 and the air outside the housing 2 is almost the entire air flow. Can be kept large, and the air inside the housing 2 and the air outside the housing 2 can be efficiently heat-exchanged.

  Further, since the fins 2g and 2h are provided on the downstream side of the air flow of the inside air blower 4 and the outside air blower 3, the fins 2g and 2h function as a rectifying means for adjusting the flow of the blown air.

  Therefore, since it can suppress that the ventilation resistance in the inside air channel | path 2b and the outside air channel | path 2c becomes large too much with respect to the increase in ventilation volume, sufficient ventilation volume can be ensured and a cooling device, ie, double wall structure The amount of heat exchange in the part can be increased.

  Further, since corrugated fins that can obtain a high heat transfer coefficient, that is, wavy fins, are adopted as the fins 2g and 2h, the amount of heat exchange in the cooling device, that is, the double wall structure portion can be increased. it can.

  Moreover, since the centrifugal fan (centrifugal blower) is adopted as the inside air blower 4 and the outside air blower 3, a high blowing capacity (air blowing pressure) is achieved while reducing the size of the housing 2 that houses the inside air blower 4 and the outside air blower 3. Can be obtained.

  By the way, in the inside air passage 2b and the outside air passage 2c, in the portions where the fins 2g and 2h are provided, the heat of the air in the housing 2 is transmitted to the partition member 2d through the fins 2h and is transmitted to the partition member 2d. The heat of the air inside the housing 2 is transmitted to the air outside the housing 2 through the fins 2g.

  At this time, in the present embodiment, the curved portion of the fin 2h arranged in the inside air passage 2b and the curved portion of the fin 2g arranged in the outside air passage 2c are placed on the partition member 2d at the same position across the partition member 2d. Since they are joined, the heat transfer path from the fin 2h arranged in the inside air passage 2b to the fin 2g arranged in the outside air passage 2c is arranged in the curved portion of the fin 2h arranged in the inside air passage 2b and the outside air passage 2c. Compared to the case where the curved portion of the fin 2g is displaced with the partition member 2d interposed therebetween.

  Therefore, since the thermal resistance from the fin 2h arranged in the inside air passage 2b to the fin 2g arranged in the outside air passage 2c is reduced, the heat exchange amount in the cooling device, that is, the double wall structure portion can be increased. .

  In addition, an opening 2j for taking in and out the communication device 1 is provided on the front side of the housing 2, and the inside air blower 4 and the outside air blower 3 are directly connected to the inside of the housing 2 from the opening 2j. Therefore, the inside air blower 4 and the outside air blower 3 can be easily repaired or inspected.

  Further, the installation direction of the housing 2 (cooling device) is not restricted as long as the opening 2j, the outside air intake port 3a, and the outside air discharge port 3b are not blocked, and thus the installation property of the housing 2 (cooling device) is not restricted. Can be improved.

  Moreover, since the air volume of the inside air blower 4 and the outside air blower 3 is increased according to the temperature rise in the housing 2, the power consumption (power consumption) of the inside air blower 4 and the outside air blower 3 is unnecessarily increased, and An increase in blowing noise can be suppressed.

  Further, since the outside air intake port 3a is opened toward the lower side of the housing 2, it is possible to prevent rainwater or the like from entering the outside air passage 2c together with the air outside the housing 2.

(Second Embodiment)
In the first embodiment, the partition member 2d has a simple flat plate shape, but in this embodiment, the partition member 2d is formed in a substantially rectangular wave shape as shown in FIG.

  Thereby, since the inside air passage 2b and the outside air passage 2c exist alternately, the surface area of the partition member 2d, that is, the heat exchange area between the air inside the housing 2 and the air outside the housing 2 increases.

  Therefore, the amount of heat exchange between the air inside the housing 2 and the air outside the housing 2 can be increased while suppressing the housing 2 from becoming large.

(Third embodiment)
In the above-described embodiment, when the fins 2g and 2h are viewed from the air flow direction, the fins 2h are disposed over the entire cross section of the inside air passage 2b so as to close the inside air passage 2b, and the fins 2g close the outside air passage 2c. Although arranged in the entire cross-section of the outside air passage 2c, in the present embodiment, the fins 2g and 2h are scattered in a staggered manner in the air flow direction as shown in FIG.

  This increases the fins 2g and 2h while increasing the total surface area of the fins 2g and 2h in the air flow direction without increasing the air passages, that is, the passage cross-sectional areas of the inside air passage 2b and the outside air passage 2c. The accompanying increase in pressure loss can be suppressed.

  That is, in order to increase the total surface area of the fins 2g and 2h without increasing the cross-sectional areas of the inside air passage 2b and the outside air passage 2c, the region where the fins 2g and 2h are provided is expanded in the air flow direction. However, if the area where the fins 2g and 2h are provided is simply enlarged in the air flow direction, the ventilation resistance in the inside air passage 2b and the outside air passage 2c increases.

  However, in the present embodiment, since the fins 2g and 2h are scattered in a staggered manner in the air flow direction, the entire passage cross-sectional areas of the inside air passage 2b and the outside air passage 2c are blocked by the fins 2g and 2h. In other words, regions where the fins 2g and 2h do not exist are scattered in a staggered manner in the air flow direction.

  Therefore, it is possible to suppress an increase in pressure loss accompanying an increase in the fins 2g and 2h while increasing the total surface area of the fins 2g and 2h in the air flow direction.

  In the present embodiment, the cross-sectional area of the region where the fins 2g and 2h are not present is selected to be approximately equal to the total air passage cross-sectional area in the region where the fins 2g and 2h are present.

(Other embodiments)
In the above-described embodiment, the fin pitch of the fins 2h arranged in the inside air passage 2b and the fin pitch of the fins 2g arranged in the outside air passage 2c are made equal, and the fin 2h arranged in the inside air passage 2b and the outside air passage 2c. However, the present invention is not limited to this, for example, the fin pitch of the fins 2h arranged in the inside air passage 2b is set to the outside air passage. As an integral multiple of the fin pitch of the fins 2g arranged in 2c, the curved portions of both the fins 2g and 2h are arranged at the same position across the partition member 2d, or the curved portions of both the fins 2g and 2h are You may make it slip | deviate on both sides of the partition member 2d.

  Moreover, in the above-mentioned embodiment, although the corrugated fin was employ | adopted as fin 2g, 2h, this invention is not limited to this.

  Moreover, in the above-mentioned embodiment, although the inside air blower 4 was arrange | positioned at the upper part of the housing | casing 2, and the outside air blower 3 was arrange | positioned at the lower part of the housing | casing 2, this invention is not limited to this, The inside air blower 4 Alternatively, the outside air blower 3 may be concentrated on the upper or lower side of the housing 2.

  Moreover, you may operate the internal air blower 4 and the external air blower 3 with one electric motor.

  Further, the present invention is not limited to the above-described embodiment as long as it conforms to the gist of the invention described in the claims.

1 is an external perspective view of a cooling device according to a first embodiment of the present invention. It is a see-through | perspective perspective view of the cooling device which concerns on 1st Embodiment of this invention. It is a schematic diagram of the cooling device which concerns on 1st Embodiment of this invention. It is sectional drawing of the heat exchange part of the cooling device which concerns on 1st Embodiment of this invention. It is a figure which shows the principal part of the cooling device which concerns on 2nd Embodiment of this invention. It is a figure which shows the principal part of the cooling device which concerns on 3rd Embodiment of this invention. It is a schematic diagram of the cooling device which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Communication equipment, 2 ... Housing, 2a ... Wall member, 2b ... Inside air passage, 2c ... Outside air passage,
2d ... partition member, 3 ... outside air blower, 4 ... inside air blower,

Claims (10)

A wall member (2a) that includes a housing (2) that houses the heating element (1), and the wall member (2a) constituting the housing (2) includes an inside air passage (2b) through which air in the housing (2) flows. A double wall structure provided with an outside air passage (2c) through which air outside the housing (2) flows;
The partition member (2d) that partitions the inside air passage (2b) and the outside air passage (2c) can exchange heat between the air flowing through the inside air passage (2b) and the air flowing through the outside air passage (2c). Consists of materials ,
Furthermore, a blower (3, 4) for blowing air to the inside air passage (2b) and the outside air passage (2c),
A fin (2g, 2h) that is provided in at least one of the inside air passage (2b) and the outside air passage (2c) and promotes heat exchange;
The fins (2g, 2h) are arranged on the downstream side of the air flow from the blowers (3, 4), and are scattered in a staggered manner in the air flow direction in the passage provided with the fins. cooling device, characterized in that is. Of the cross-sectional area of the inside air passage (2b) and the outside air passage (2c) where the fin is provided, the area of the region where the fin is present and the area of the region where the fin is not present are The cooling device according to claim 1, wherein the cooling devices are equal. The cooling device according to claim 1 or 2 , wherein the partition member (2d) is made of a metal mainly composed of aluminum. The cooling according to any one of claims 1 to 3, wherein the air flowing through the inside air passage (2b) and the air flowing through the outside air passage (2c) are configured to face each other. apparatus. The cooling device according to any one of claims 1 to 4 , wherein the blower (3, 4) is a centrifugal blower that blows air in an outer diameter direction by centrifugal force. The cooling device according to any one of claims 1 to 5 , further comprising a control unit that increases an amount of air blown from the blower (3, 4) in response to a temperature rise in the housing (2). . The fins (2g, 2h) are formed in a wave shape so as to have a large number of curved portions and connecting portions connecting the curved portions, and the fins (2h) disposed in the inside air passage (2b) The curved portion and the curved portion of the fin (2g) disposed in the outside air passage (2c) are joined to the partition member (2d) at the same position across the partition member (2d). The cooling device according to any one of claims 1 to 6, wherein The fin (2h) arranged in the inside air passage (2b) and the fin (2g) arranged in the outside air passage (2c) are corrugated fins having the same pitch dimension. Item 8. The cooling device according to Item 7. Any one of claims 1 to 8, characterized in that the heating element (1) opening for loading and unloading the (2j) the blower to direct visible position from the (3,4) is housed The cooling device according to 1. The partition member (2d), the internal air passages, as (2b) and the outdoor air passage and (2c) are present alternately, any claims 1, characterized in that it is formed in the rectangle wave 9 The cooling device according to any one of the above.

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