JP2008051404A - Cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling storage capable of keeping successful ventilation efficiency for a long time. <P>SOLUTION: This cooling storage 100 comprises a main body 1, an axial flow fan 52 sucking a gas for cooling a radiating portion 41 of the main body 1, a suction opening 63 formed on a bottom surface 8 of the main body 1 for allowing a gas sucked by the axial flow fan 52 to flow in, an air discharge opening 64 formed on a top surface 10 of the main body 1 for allowing the gas sucked by the axial flow fan 52 to flow out, an air duct 60 communicating the suction opening 63 and the air discharge opening 64 for circulating the gas, and a filter 7 disposed in the air duct 60, the air duct 60 has an air duct upstream portion 61, an air duct relay portion 62 and a heat exchanger chamber 50, a flow channel cross-sectional area of the air duct upstream portion 61 is larger than that of the air duct relay portion 62, the filter 7 is disposed on the air duct upstream portion 61, and an area of the filter 7 is larger than the flow channel cross-sectional area of the air duct relay portion 62. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates generally to a refrigerator, and more particularly to a refrigerator that air-cools a heat dissipating unit.

  Generally, the refrigerator is mainly installed in a cooking room such as a kitchen or a kitchen. The refrigerator disposed in the cooking chamber is constantly exposed to steam, oily smoke, and the like generated from other cooking appliances. For this reason, foreign matters such as oil and dust carried along with steam and smoke generated from surrounding cooking equipment may adhere to the inner wall and outer wall of the refrigerator. Oil and dust adhering to the refrigerator may adversely affect the cooling performance of the refrigerator. In particular, in a refrigerator that forcibly cools a worm section (a worm head or a high-temperature part) that is a heat radiating part of a refrigerator with air sucked from outside by a blower, oil sucked from the outside of the refrigerator together with air There is a problem that foreign matters such as dust easily adhere to the worm section. This problem is significant in refrigerators that require a relatively large air volume when cooling a worm section such as a Stirling refrigerator by blowing air. Therefore, it is necessary to take measures to prevent foreign matter from adhering to the worm section.

  Conventionally, in order to prevent foreign matter from adhering to the worm section, for example, a secondary heat dissipation system in the worm section has been devised, such as a refrigerator described in Japanese Patent Application Laid-Open No. 2003-302117 (Patent Document 1). There is one that allows air cooling of the worm section only by natural convection.

  In the refrigerator described in Japanese Patent Application Laid-Open No. 2004-156802 (Patent Document 2), the heat exchanger is cooled by forced air blowing by a blower while adopting a natural circulation system of a secondary refrigerant.

Further, as shown in, for example, Japanese Patent Application Laid-Open No. 2002-90032 (Patent Document 3), the air sucked from the lower part of the rear side of the cooler is passed through the air duct provided on the rear side of the cooler. There is a configuration in which it is guided to the machine room and supplied to the worm section via a filter installed in the machine room. This is to avoid the adhesion of foreign matter such as oil and dust to the worm section as much as possible by taking in the air near the lower part of the main body with a relatively small content of foreign matter such as oil and dust and through a filter. .
JP 2003-302117 A JP 2004-156802 A Japanese Patent Laid-Open No. 2002-90032

  However, due to design restrictions and the like, the refrigerator is not necessarily cooled by natural convection of the secondary refrigerant as disclosed in Japanese Patent Application Laid-Open No. 2003-302117 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2004-156802 (Patent Document 2). It is not possible. If air cooling only by natural convection of the secondary refrigerant is possible, measures against foreign matter adhering to the worm section are not necessarily required, but if forced air blowing is required, foreign matter adhering to the worm section. Some kind of countermeasure is required.

  Moreover, about the refrigerator which cools a worm section by blowing in an air duct like the refrigerator described in Unexamined-Japanese-Patent No. 2002-90032 (patent document 3), especially of worm sections, such as a Stirling refrigerator. In a refrigerator that requires a relatively large air volume for air cooling, there is a problem that the wind speed is increased in the air duct and in the suction port.

  For example, the high wind speed when passing through the filter makes it easy for foreign matters such as oil and dust to adhere to the filter mesh. Therefore, it is necessary to clean the filter more frequently. In addition, the possibility that foreign substances pass through the filter mesh increases. Therefore, in order to prevent foreign matters from adhering to the inside of the air duct or the worm section, it is necessary to use a filter having a higher density. Therefore, an unfavorable situation occurs in which the ventilation resistance of the filter increases or maintenance is required.

  Further, for example, when the wind speed of the suction airflow from the suction port is increased, foreign matter having a relatively large mass is also sucked from the suction port. As a result, there is a problem that the content of foreign matter in the sucked airflow is increased, and contamination of the air duct and the filter is promoted. In particular, when the possibility of foreign matter adhering to the worm section increases, an undesirable situation such as a decrease in cooling efficiency occurs.

  Then, the objective of this invention is providing the refrigerator which can maintain favorable ventilation efficiency over a long period of time.

  The refrigerator according to the present invention includes a main body, a blower for sucking a gas for cooling the heat radiating portion of the main body, a suction port for flowing in a gas that is disposed in the lower portion of the main body and is sucked by the blower, A blowout port for the gas that is disposed at the upper part of the main body and sucked by the blower to flow out, a flow path through which the gas flows through the suction port and the blowout opening, and a filter disposed in the flow path Provided, the flow path has an upstream portion and a downstream portion, the flow passage cross-sectional area of the upstream portion is larger than the flow passage cross-sectional area of the downstream portion, the filter is disposed in the upstream portion, and the area of the filter is the flow passage in the downstream portion It is larger than the cross-sectional area.

  By making the flow path cross-sectional area of the upstream part of the flow path larger than the flow path cross-sectional area of the downstream part, the wind speed of the gas sucked in the suction port provided in the upstream part can be reduced. When the wind speed of the gas sucked at the suction port is reduced, the amount of suction of foreign matter such as dust can be reduced. Moreover, it can prevent that a foreign material adheres to a filter.

  Further, since the area of the filter is larger than the cross-sectional area of the downstream channel, the suction flow velocity can be reduced without increasing the ventilation resistance by the filter.

  On the other hand, the swirl flow is excited in the downstream part by the intake air sucked into the flow path by the blower flowing from the filter arranged in the upstream part to the connection part between the upstream part and the downstream part. The swirl flow is a horizontal spiral flow, and centrifugal force acts on foreign matter such as oil and dust in the intake air that forms the swirl flow. The foreign matter on which the centrifugal force has acted is driven to the wall surface of the flow path, but the flow velocity traveling upward along the flow path is slower on the wall surface side of the flow path than in the vicinity of the center of the cross section of the flow path. For this reason, foreign matter that cannot be supported by the upwardly moving gas among the foreign matter in the intake air falls down, making it difficult for the foreign matter to reach the downstream of the flow path.

  Thus, the flow path has an upstream portion and a downstream portion, the upstream cross-sectional area is larger than the downstream cross-sectional area, the filter is disposed in the upstream portion, and the filter area is in the downstream portion. By being larger than the cross-sectional area of the flow path, the flow rate of the gas in the upstream portion where the suction port is present can be slowed, so that foreign matter is hardly sucked from the suction port, and foreign matter is less likely to adhere to the filter. Furthermore, the swirl flow can be excited in the upstream portion, centrifugal force can be applied to the foreign matter, and the foreign matter can be removed from the intake air.

  By doing in this way, the refrigerator which can maintain favorable ventilation efficiency over a long period can be provided about the refrigerator which cools a thermal radiation part by ventilating external air.

  In the refrigerator according to the present invention, the filter is disposed obliquely so that the end portion on the side close to the connecting portion between the upstream portion and the downstream portion is located on the bottom surface side of the main body from the opposite end portion. Preferably it is.

  The gas in the upstream part is sucked toward the downstream part by the blower. Therefore, when the filter is horizontally disposed, when the gas passes through the filter, the suction force is strong in the portion near the downstream portion in the filter surface, so the flow velocity is large, and the suction force is weak in the portion away from the downstream portion. Therefore, the flow rate of gas becomes small. Thus, if there is a difference in the flow velocity of the gas passing through the filter depending on the location in the filter surface, foreign matters such as dust adsorbed on the filter surface are likely to adhere to the portion where the flow velocity of the gas passing through the filter is large.

  Therefore, in the refrigerator of the present invention that sucks gas from the lower part of the main body, the end of the filter that is closer to the connection part between the upstream part and the downstream part is located closer to the bottom face of the main body than the opposite end part. Arrange them diagonally. By doing in this way, the difference of the distance from each part in a filter surface to the connection part of an upstream part and a downstream part can be made small. Since the difference in suction force acting on each part in the filter surface is reduced, the flow velocity of the gas passing through the filter is made uniform.

  The filter has a rectifying action. That is, the airflow passing through the filter has a property that it tends to flow in a direction perpendicular to the filter surface. For example, when the filter is installed horizontally, a short circuit may occur because the wind speed is small and the flow direction is not stable in a part away from the downstream part in the filter surface. Therefore, the flow direction of gas is stabilized by the rectifying effect of the filter by installing the filter diagonally so as to reduce the difference in distance from each part in the filter surface to the connection part between the upstream part and the downstream part. Thus, the generation of a short circuit can be avoided as much as possible. In this way, the passing wind speed at each part of the filter can be made more uniform.

  By doing so, there is no bias in the adhesion of foreign matter to the filter surface, and foreign matter is less likely to adhere to the filter.

  In the refrigerator according to the present invention, the blower is preferably arranged at the upper part of the downstream portion.

  By doing in this way, the production | generation of the swirl flow in an upstream part is not prevented by the air blower. Further, the generated swirl flow can be used efficiently. For example, when the blower is arranged at the downstream end of the downstream portion, the generation of the swirl flow in the upstream portion can be utilized to the maximum extent.

  In the refrigerator according to the present invention, it is preferable that the blower is disposed on the top surface of the main body so that the suction portion of the blower faces the air outlet.

  By doing so, the swirl flow is not blocked by the blower inside the downstream portion, so that the swirl flow can be maintained in the entire downstream portion, and the influence of the rotation of the blower increases the rotation of the swirl flow. Can be made as large as possible. By doing in this way, the effect of the foreign material removal by a swirl flow can be utilized to the maximum extent.

  In the refrigerator according to the present invention, it is preferable that the blower is a sirocco fan, and the air outlet of the sirocco fan faces the front direction of the main body.

  By doing so, the swirl flow is not blocked by the blower inside the downstream portion, so that the swirl flow can be maintained in the entire downstream portion, and the rotation of the blower gives the rotation of the swirl flow to be strengthened. The impact can be maximized. Further, for example, even if a refrigerator is installed in a place where both side surfaces and the top surface of the main body are surrounded, the blown airflow can be efficiently sent back into the room. By doing so, the overall flow resistance can be reduced.

  In the refrigerator according to the present invention, it is preferable that the filter is disposed obliquely so that the front end portion of the main body is positioned above the rear end portion of the main body.

  For example, in a refrigerator installed at a location where both side surfaces and the top surface of the refrigerator are in contact with the wall surface, gas can be sucked only from the front of the refrigerator. Even in such a case, the swirl flow can be excited without adversely affecting the air flow from the filter to the connection portion between the upstream portion and the downstream portion.

  As described above, according to the present invention, it is possible to provide a refrigerator that can maintain good ventilation efficiency over a long period of time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration including a partial cross section of a refrigerator as a first embodiment of the present invention, and FIG. 2 is a partial front sectional view of the refrigerator of the first embodiment. It is a figure which shows schematic structure including this. In FIG. 1, the left side of the figure is the front of the refrigerator, and the right side of the figure is the back of the refrigerator.

  As shown in FIG. 1 and FIG. 2, the refrigerator 100 includes an interior space 3 surrounded by a heat insulating material 2, a Stirling refrigerator 4, a heat exchanger chamber 50, and a flow path inside the main body 1. An air duct 60 and a filter 7 are provided. The refrigerator 100 is supported by the legs 9 so that the bottom surface 8 and the floor surface of the main body 1 do not contact each other. In the lower part of the main body 1, a suction port 63 of an air duct 60 is formed in the bottom surface 8 in this embodiment. The object to be cooled is stored in the interior space 3.

  In the heat exchanger chamber 50, a high temperature side heat exchanger 51 for radiating the heat generated by the heat radiating unit 41 of the Stirling refrigerator 4 and air for cooling the high temperature side heat exchanger 51 from the outside are supplied from the outside. An axial fan 52 is installed as a blower for suction.

  The air duct 60 includes an air duct upstream portion 61 as an upstream portion, and an air duct relay portion 62 and a heat exchanger chamber 50 as downstream portions. A suction port 63 of the air duct 60 is provided on the bottom surface 8 of the main body 1. The exhaust port 64 as a blower outlet communicates with the upper portion of the heat exchanger chamber 50 and is disposed at the upper portion of the main body 1, and is disposed on the top surface 10 in this embodiment. The air duct upstream part 61 and the air duct relay part 62 are connected by a connection part 65.

  FIG. 3 is a schematic front perspective view showing the arrangement of air ducts in the refrigerator of the first embodiment.

  As shown in FIG. 3, the exterior surface of the main body 1 of the refrigerator 100 is formed by a top surface 10, a bottom surface 8, a front surface 1a, a right side surface 1b, a back surface 1c, and a left side surface 1d. The air duct 60 is installed along the top surface 10, the bottom surface 8, the back surface 1 c, and the left side surface 1 d of the exterior surface of the main body 1 of the refrigerator 100 so that the interior space 3 can be maximized. .

  The heat exchanger chamber 50 is located on the inner side of the exterior plate on the back surface 1c and the left side surface 1d of the main body 1 and on the outer side of the interior space 3, and near the corner portion composed of the top surface 10, the back surface 1c and the left side surface 1d of the main body 1. It is installed in the position. The upper part of the heat exchanger chamber 50 communicates with an exhaust port 64 provided on the top surface 10 of the main body 1, and the lower part of the heat exchanger chamber 50 communicates with an air duct relay unit 62. Together with the air duct 60, the heat exchanger chamber 50 also serves as a flow path.

  The air duct 60 has a vertically long rectangular duct shape having a cross-sectional area equivalent to the horizontal cross section of the heat exchanger chamber 50 in the region from the lower part of the heat exchanger chamber 50 to the bottom surface of the internal space 3. This region is referred to as an air duct relay unit 62. In the region from the bottom surface of the internal space 3 to the bottom surface 8 of the main body 1, the air duct 60 has a rectangular duct shape that is flat in the horizontal direction and has a cross-sectional area equivalent to the horizontal cross section of the cooling chamber 100. This region is an air duct upstream portion 61. The air duct relay portion 62 and the air duct upstream portion 61 communicate with each other through a connection portion 65 that is an opening having a horizontal sectional area equivalent to that of the air duct relay portion 62. The lower surface of the air duct upstream portion 61 communicates with the suction port 63.

  A filter 7 is provided in the air duct upstream portion 61 for filtering out foreign matters such as dust and oil in the gas sucked into the air duct 60. The area of the filter 7 is substantially the same as a cross section of a diagonal surface with the horizontal ridgeline of the air duct upstream portion 61 as a part of the side, and has a size that can cross the flow path of the air duct upstream portion 61. . The filter 7 is installed so as to be inclined so that the end portion on the front surface 1 a side of the refrigerator 100 is positioned above the end portion on the rear surface 1 c side of the refrigerator 100. That is, the end of the filter 7 closer to the back surface 1c of the main body 1, which is the side surface on which the air duct relay portion 62 is located, is more air-tight than the end of the filter 7 on the front 1a side of the main body 1 facing it. Inclined so as to be located upstream of 60, that is, in the direction of the bottom surface 8 of the main body 1.

  The gas outside the refrigerator 100 is sucked into the air duct 60 from the suction port 63 disposed on the bottom surface 8 of the main body 1 by the rotation of the axial fan 52. The sucked gas passes through the filter 7 in the air duct upstream portion 61, and at this time, a part of foreign matters such as dust and oil contained in the gas is removed from the gas. The gas that has passed through the filter 7 passes through the connection portion 65 and flows into the air duct relay portion 62 disposed above the air duct upstream portion 61. A heat exchanger chamber 50 is disposed downstream of the air duct relay unit 62. The heat exchanger chamber 50 is provided with an axial fan 52 for sucking gas and a high temperature side heat exchanger 51. The gas flows into the heat exchanger chamber 50, cools the high temperature side heat exchanger 51, and flows out of the refrigerator 100 through the exhaust port 64 formed in the upper part of the heat exchanger chamber 50.

  In the refrigerator 100 having the configuration shown in FIGS. 1 to 3, the airflow in the air duct 60 exhibits the following three properties.

  As a first property, even when a relatively large amount of air is blown by the axial fan 52, the flow passage area of the upstream portion 61 of the air duct is increased, and the ventilation area of the filter 7 and the suction port 63 is accordingly increased. By enlarging, the passing air speed at the filter 7 and the sucking air speed at the suction port 63 can be suppressed lower than the passing air speed at the peripheral portion of the axial fan 52.

A specific example of the wind speed of the gas sucked into the refrigerator 100 will be shown. For example, in a refrigerator having an internal capacity of about 450 L with a Stirling refrigerator as a cold heat source (outside dimensions: height of about 1.8 m, width of about 0.8 m, depth of about 0.7 m), from the relationship of cooling capacity, It is necessary to air-cool the high temperature side heat exchanger 51 having a height of about 0.1 m, a width of about 0.25 m, and a depth of about 0.15 m at a maximum air flow of about 2 m ³ / min. Assuming that the horizontal cross-sectional area of the axial fan 52 and the air duct relay section 62 is the same as the horizontal cross-sectional area of the high temperature side heat exchanger 51, the wind flows around the axial fan 52 at a maximum wind speed of about 1 m / s. It will be. Therefore, if the air duct 60 is formed up to the suction port 63 with this horizontal cross-sectional area as in the conventional refrigerator, the suction port 63 also sucks air at a wind speed of about 1 m / s. When the suction wind speed at the suction port 63 is less than about 1 m / s, the cooler 100 actively sucks relatively large foreign objects against gravity. Therefore, it is inevitable that the filter 7 is polluted or deteriorated early.

  Therefore, an air duct upstream portion 61 having a larger channel cross-sectional area than the air duct relay portion 62 close to the axial fan 52 is provided in the air duct 60 as in the configuration of the refrigerator 100 of the present embodiment. If the horizontal cross-sectional area of the air duct upstream portion 61 and the suction port 63 is about 0.7 m in width and about 0.6 m in depth, the wind speed at the air duct upstream portion 61 and the suction port 63 is about 0.1 m / s or less. Can be reduced. At such a wind speed, only relatively small foreign matter is sucked. Therefore, the size of the foreign matter that collides with or contacts the filter 7 is limited to a relatively small size. Further, by reducing the wind speed, it is possible to reduce the frequency with which foreign matters collide with or come into contact with the filter 7. By doing so, the contamination of the filter 7 can be reduced and the life of the filter 7 can be extended.

  Thus, by making the flow passage cross-sectional area of the air duct upstream portion 61 of the air duct 60 larger than the flow passage cross-sectional area of the air duct relay portion 62, suction is performed at the suction port 63 provided in the air duct upstream portion 61. The wind speed of the generated gas can be reduced. When the wind speed of the gas sucked at the suction port 63 is reduced, the amount of suction of foreign matters such as dust can be reduced. Further, it is possible to prevent foreign matters from adhering to the filter 7.

  Moreover, since the area of the filter 7 is larger than the flow path cross-sectional area of the air duct relay part 62, the suction flow velocity can be reduced without increasing the ventilation resistance by the filter 7.

  The second property of the airflow in the air duct 60 is that the filter 7 is installed at an angle so that the end close to the air duct relay part 62 is lower than the other end, so that various parts of the filter 7 are arranged. The air volume of the passing air can be made uniform as a whole.

  FIG. 4 is a diagram schematically illustrating the airflow passing through the filter. 4A shows the case where the filter is installed horizontally, and FIG. 4B shows the case where the filter is installed obliquely so that the end on the side close to the downstream part of the filter is lower than the other end of the filter. FIG. The arrows in the figure indicate the speed and direction of the airflow. The larger the length of the arrow, the faster the airflow speed.

  As shown in FIG. 4 (A), when the filter 7 is installed horizontally, the passing wind speed is high in the surface of the filter 7 and is biased toward the back surface 1c side of the main body 1 where the air duct relay portion 62 is located. An area exists. The gas in the air duct upstream portion 61 is sucked toward the air duct relay portion 62 by the rotation of the axial fan 52. Therefore, when the filter 7 is disposed horizontally, when the gas passes through the filter 7, the force sucked by the air duct relay unit 62 is strong in the portion close to the air duct relay unit 62, so the wind speed is large, and the air duct relay unit 62. In the part away from, the sucked force is weak and the wind speed becomes small. Thus, if there is a difference in the wind speed passing through the filter 7 depending on the location in the plane of the filter 7, the foreign matter adsorbed on the filter 7 is likely to adhere to the portion where the wind speed passing through the filter 7 is high, and the It adheres uniformly.

  On the other hand, as shown in FIG. 4B, when the filter 7 is installed obliquely, the distance between the connection portion 65 between the air duct relay portion 62 and the air duct upstream portion 61 and each part of the filter 7 is as follows. The filter 7 becomes more uniform than when the filter 7 is installed horizontally. By doing so, the difference in suction force acting on each part of the filter 7 is reduced, so that the wind speed passing through the filter 7 is made uniform. Accordingly, there is no bias in the adhesion of foreign matter to the filter 7, and foreign matter is less likely to stick to the filter 7.

  The filter has a rectifying action. That is, the airflow passing through the filter tends to flow in a direction perpendicular to the filter surface. As shown in FIG. 4 (A), when the filter 7 is installed horizontally, the suction flow velocity is small at the portion of the air duct upstream portion 61 on the front surface 1a side of the main body 1 and the flow direction is not stable, so that a short circuit may occur. There is. Therefore, as shown in FIG. 4B, the filter 7 is inclined so that the difference in distance from each part of the filter 7 to the connection part 65 between the air duct upstream part 61 and the air duct relay part 62 is reduced. It is possible to stabilize the flow direction of the gas sucked by the rectifying effect of the filter 7 and avoid the generation of a short circuit as much as possible. In this way, the passing wind speed at each part of the filter 7 can be made more uniform.

  In this way, the gas passing through the filter 7 is installed by obliquely installing the filter 7 such that the end portion of the filter 7 near the air duct relay portion 62 is lower than the other end portions. The direction in which the air flows and the wind speed can be made uniform, the uneven distribution of the foreign matter adhering to the filter 7 can be alleviated, and local foreign matter accumulation can be suppressed. Moreover, since the maximum value of the passing wind speed of the filter 7 can be reduced, the size of the foreign matter that collides with or contacts the filter 7 is limited to a relatively small size. When the maximum value of the passing wind speed of the filter 7 is reduced, the frequency with which foreign matter collides with or comes into contact with the filter 7 is also reduced, so that the contamination of the filter 7 can be reduced.

  By doing so, the adhesion of foreign matter to the surface of the filter 7 is not biased, and the foreign matter is less likely to adhere to the filter 7.

  As a third property of the airflow in the air duct 60, a swirl flow that is excited in the air duct upstream portion 61 and maintained in the air duct relay portion 62 can be created. The swirl flow is a swirl flow with the flow path direction as the axial direction.

  The foreign matter that has passed through the filter 7 flows into the air duct relay section 62 together with the gas. Foreign matter in the gas is driven to the wall surface side of the air duct relay unit 62 by the centrifugal force due to the swirl flow in the air duct relay unit 62. In general, the flow speed of traveling upward along the flow path is slower on the wall surface side of the air duct 60 than on the center side of the air duct 60. For this reason, the force (Stokes drag, etc.) that the foreign substance on the wall surface side of the air duct relay unit 62 receives from the air is also smaller than when the foreign substance is on the center side of the air duct 60, and the foreign substance is carried downstream. It becomes difficult. Therefore, the foreign matter is less likely to adhere to the downstream portion of the air duct relay portion 62 or to the heat exchanger chamber 50 downstream of the air duct relay portion 62 and adhere to the high heat side heat exchanger 51. , Pollution of those parts can be reduced.

  The swirl flow is excited by the following mechanism.

  FIG. 5 is a front perspective view of the cooler of the first embodiment showing an outline of the air flow in the air duct. Arrows in the figure indicate airflow.

  As shown in FIG. 5, the flow a of the gas sucked from the suction port 63 is rectified by the filter 7, and then flows toward the connection portion 65 between the air duct upstream portion 61 and the air duct relay portion 62. When the flow a passes through the filter 7, the flow rate decreases due to the filter 7 becoming an obstacle. At this time, the side closer to the air duct relay part 62, that is, the side closer to the air duct relay part 62 in the flow of gas sucked from the front surface 1a of the main body 1, that is, the left side 1d side of the main body 1 The suction flow from the flow b1 is the flow farther from the air duct relay part 62, that is, the suction flow from the right 1b surface of the main body 1 is referred to as flow b2.

  Once the flow velocity of the flow b1 decreases when passing through the filter 7, the distance of the run-up section to the connection portion 65 is short, so that the flow b1 reaches the connection portion 65 with a relatively slow flow. On the other hand, the flow b <b> 2 flows in the air duct upstream portion 61 toward the back surface 1 c side of the main body 1 according to the shape of the inner wall of the air duct 60 after the flow velocity is reduced by the ventilation resistance and the rectification effect of the filter 7. The flow direction is changed to the left side surface 1d in the main body 1 in the right rear corner region (the corner portion surrounded by the right side surface 1b and the back surface 1c of the main body 1) in the air duct upstream portion 61, and the connecting portion 65 It flows toward. As described above, since the flow b2 has a long run-up section to the connection portion 65, when the flow b2 reaches the connection portion 65, the flow velocity is recovered and the flow b2 is a relatively fast flow. Further, when the flow b2 changes the flow direction in the right back corner portion region of the air duct upstream portion 61, the flow b2 has a counterclockwise angular momentum as viewed vertically downward from the top surface 10 of the main body 1. The clockwise angular momentum in the opposite direction is borne by the vortex generated in the right back corner, and the balance of angular momentum is maintained.

  Thus, when the flow b2 has a larger flow velocity than the flow b1, and the flow b2 has a counterclockwise angular momentum, the flow b1 and the flow b2 merge at the connection portion 65, so that the swirl flow c is It is formed. The swirl flow c is also maintained in the downstream air duct relay section 62.

  As described above, the suction flow rate at the suction port 63 is reduced by the first property of the airflow in the air duct 60, and the amount of foreign matter drawn into the suction port 63 and the degree of foreign matter size are reduced. Further, due to the second property, the unevenness of the passing wind speed in the entire filter 7 is averaged to suppress the unevenness of the adhesion of foreign matters, and the maximum value of the passing wind speed is reduced. Further, the third property can suppress the foreign matter sucked into the air duct 60 from reaching the downstream side. Therefore, the contact of the foreign matter to the air duct 60 and the filter 7 is reduced, the contamination of the high temperature side heat exchanger 51 and the filter 7 is reduced, and the uneven contact of the foreign matter within the surface of the filter 7 can also be reduced. The local clogging of the filter 7 can be suppressed, and the maintenance efficiency of the filter 7 can be improved.

  By doing in this way, favorable ventilation efficiency can be maintained over a long period about the refrigerator which cools a thermal radiation part by ventilating outside air.

  If the axial fan 52 is installed in the air duct relay unit 62, the axial fan 52 does not hinder the generation of the swirl flow in the air duct upstream part 61. When the axial fan 52 is arranged on the upper part of the air duct relay part 62, the swirl flow can be maintained over a wide range of the air duct relay part 62. By doing so, the swirl flow can be effectively used, and foreign matters in the gas can be efficiently removed by the centrifugal force of the swirl flow.

  More preferably, the axial fan 52 is disposed on the top surface 10 of the main body 1 that is the downstream end of the air duct 60 so that the suction portion of the axial fan 52 faces the exhaust port 64. By doing so, the swirl flow is not blocked inside the air duct relay part 62, so that the swirl flow can be maintained throughout the air duct relay part 62. Further, the influence of the rotation of the axial fan 52 so as to increase the rotation of the swirl flow can be increased. By doing in this way, the effect of the foreign material removal by a swirl flow can be utilized to the maximum extent.

  The position of the air duct relay unit 62 is not limited to the left back side of the main body 1 as shown in FIG. 3, and the air duct relay unit 62 may be located at the position of the air duct relay unit 62 on the right back side, left front side, or right front side of the main body 1. Accordingly, the installation direction of the filter 7 is adjusted, so that the typical flow direction in the air duct upstream portion 61 and the direction from the center of the suction port 63 to the center of the connection portion 65 are not the same. The swirl flow can be excited. However, if the air duct relay part 62 is installed on the front surface 1a side of the main body 1, the entrance of the interior space 3 is narrowed, which is difficult in terms of convenience. Therefore, the air duct relay part 62 is preferably installed on the back surface 1c side of the main body 1 if possible.

  In the refrigerator 100, the filter 7 is arranged obliquely so that the end of the filter 7 on the front 1 a side of the main body 1 is positioned higher than the end of the main body 1 on the back 1 c side. It is preferable.

  If the refrigerator 100 is installed in a place where both side surfaces and the top surface 10 of the refrigerator 100 are in contact with the wall surface, gas can be sucked only from the front surface 1a of the main body 1. Even in such a case, if the end portion of the filter 7 is disposed obliquely so that the end portion on the front surface 1a side of the main body 1 is located above the end portion on the back surface 1c side of the main body 1, Since the flow direction of the gas passing through the filter 7 is rectified in the normal direction of the surface of the filter 7, the swirl flow without adversely affecting the gas flow flowing between the filter 7 and the connecting portion 65. Can be excited.

  The high temperature side heat exchanger 51 is not necessarily installed near the exhaust port 64 on the top surface 10, but the vicinity of the exhaust port 64 is located on the most downstream side of the air duct 60, so that the high temperature side heat exchanger 51 It is easier to prevent contact and adhesion of foreign matter to 51. Furthermore, if the axial fan 52 is provided directly below the high temperature side heat exchanger 51, air having a higher wind speed can be blown to the high temperature side heat exchanger 51, so that the heat radiation part 41 can be effectively cooled. it can.

(Second embodiment)
FIG. 6 is a perspective view showing the overall configuration of the refrigerator as a second embodiment of the present invention.

  As shown in FIG. 6, the refrigerator 200 is different from the refrigerator 100 of the first embodiment in that it does not include an axial fan, and a sirocco fan 53 is installed on the top surface 10 of the main body 1 as a blower. . The suction portion of the sirocco fan 53 is opposed to the exhaust port 64, and the air outlet 54 of the sirocco fan 53 is installed so as to face the front 1a direction of the refrigerator 200. Other configurations of the refrigerator 200 are the same as those of the refrigerator 100.

  By doing in this way, while being able to maintain a swirl flow in the whole air duct relay part 62, the influence that rotation of the sirocco fan 53 intensifies rotation of a swirl flow can be enlarged. Furthermore, even when the refrigerator 200 is installed in a place where both side surfaces and the top surface 10 are surrounded by the wall surface, the air flow from the sirocco fan 53 facing the front surface 1a of the main body 1 is efficiently sent back into the room. Can do. By doing so, the overall flow resistance can be reduced.

  The embodiment disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiments but by the scope of claims, and includes all modifications and variations within the meaning and scope equivalent to the scope of claims.

It is a figure which shows schematic structure including the partial cross section of the refrigerator of 1st embodiment of this invention. It is a figure which shows schematic structure including the partial front cross section of the refrigerator of 1st embodiment of this invention. It is a front perspective view which shows arrangement | positioning of the air duct in the refrigerator of 1st embodiment of this invention. It is a figure which shows typically the airflow which passes a filter. (A) is a diagram when the filter is installed horizontally, and (B) is a diagram when the filter is installed obliquely so that the end on the side close to the downstream portion of the filter is below the other end of the filter. . It is a front perspective view of the refrigerator of 1st embodiment which shows the outline of the airflow in an air duct. It is a perspective view which shows the whole structure of a refrigerator as 2nd embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Main body, 7: Filter, 8: Bottom surface, 10: Top surface, 41: Radiation part, 50: Heat exchanger room, 51: High temperature side heat exchanger, 52: Axial fan, 53: Sirocco fan, 54: Outlet, 60: Air duct, 61: Air duct upstream part, 62: Air duct relay part, 63: Suction port, 64: Exhaust port, 65: Connection part, 100: Cooling chamber, 200: Cooling chamber.

Claims (6)

The body,
A blower for sucking a gas for cooling the heat radiating part of the main body;
A suction port for the gas that is arranged at the lower part of the main body and sucked by the blower to flow in;
A blowout port for the outflow of gas that is arranged at the top of the main body and is sucked by the blower;
A flow path through which gas flows through the suction port and the blowout port;
A filter disposed in the flow path,
The flow path has an upstream portion and a downstream portion, the flow passage cross-sectional area of the upstream portion is larger than the flow passage cross-sectional area of the downstream portion, the filter is disposed in the upstream portion, and the area of the filter is A refrigerator that is larger than the cross-sectional area of the downstream portion.   2. The filter according to claim 1, wherein the filter is disposed obliquely such that an end portion on a side close to a connection portion between the upstream portion and the downstream portion is located on a bottom surface side of the main body from an end portion on the opposite side. The listed refrigerator.   The refrigerator according to claim 1 or 2, wherein the blower is disposed at an upper portion of the downstream portion.   The refrigerator according to any one of claims 1 to 3, wherein the blower is arranged on a top surface of the main body, and a suction portion of the blower is arranged to face the blower outlet.   The refrigerator according to claim 4, wherein the blower is a sirocco fan, and an outlet of the sirocco fan faces a front direction of the main body.   The said filter is arrange | positioned diagonally so that the edge part by the side of the front side of the said main body may be located upwards rather than the edge part by the side of the back surface of the said main body. The listed refrigerator.

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