JP6119114B2 - Showcase - Google Patents

Description

  The present invention relates to a showcase with a built-in refrigerator, and more particularly, to a showcase having a cleaning unit that removes dust adhering to a condenser filter of a refrigerator unit built in a stand of the showcase.

  In conventional showcases with built-in refrigerators, refrigerators (compressors, condensers, blowers, etc.) are placed inside the base of the showcase, and a filter is detachably provided on the front of the condenser. A vent hole cover having an outside air intake hole is attached to the front side of the. In such a showcase, when the filter is cleaned, an operation for removing the vent cover and the filter is required. In order to improve the workability of the detachment work, there has been proposed one in which a filter is held by a vent hole cover (see, for example, Patent Document 1).

  However, the cleaning that the worker periodically removes the filter is laborious and inefficient. If the user forgets to clean the filter and the filter is clogged, the cooling capacity may be reduced or the refrigerator may be damaged. In view of this, there has been proposed a device that is provided with suction means, automatically sucks dust adhering to the filter, and cleans the filter without removing the filter. (For example, see Patent Document 2)

Japanese Patent Application Laid-Open No. 2004-245569 (Claim 1, FIG. 1) JP 2009-180399 A (Claim 1, FIG. 3)

  In the conventional filter cleaning by the suction means of the showcase (the above-mentioned Patent Document 2), the filter can be automatically cleaned, but for dust adhering to the filter due to moisture from the condenser, It has been difficult to reliably remove by suction force alone. As what removes such dust, what removes dust by scraping off dust with a rotating brush etc., and peeling off dust adhering to a rotating brush is considered.

  However, in the case of using a rotating brush, there is a possibility that dust peeled off from the rotating brush may be reattached to the rotating brush or the filter. In order to prevent this re-adhesion, it is sufficient to provide a space for storing the dust separated from the rotating brush. However, in the case of a showcase, if such a space is provided in front of the filter, the pedestal expands outward. It will be.

  If the pedestal is expanded outward, it is not desirable because it is easy for the user to hit the toe of the foot when approaching the showcase, and the safety may be lowered, and the installation area is increased. In this way, in consideration of safety and the like in the showcase, it is not possible to provide a sufficient space to accommodate the dust by expanding the pedestal outward, so that the dust removed with the rotating brush or the like is not reattached to the filter. It was difficult to prevent.

  The present invention has been made in order to solve the above-described problems. In addition to dust adhering to the surface of the filter, the present invention reliably removes dust adhering to the filter due to moisture, etc. An object of the present invention is to provide a showcase provided with an automatic filter cleaning unit that prevents the removed dust from reattaching to the filter.

The showcase according to the present invention passes through a condenser provided in a gantry at the lower part of the showcase, a filter disposed on the front surface of the condenser and provided to be movable in the left-right direction, and the moving filter. A cleaning unit provided at a position, the cleaning unit is provided at a position in contact with the filter passing therethrough , and includes a rotating brush that removes dust adhering to the filter, and a plate-like member, and a tip portion of the cleaning unit. A dust removing portion that contacts the rotating brush and peels off dust adhering to the rotating brush, an opening provided close to a base end portion of the dust removing portion, and connected to the opening and peeled off by the dust removing portion A suction portion for sucking the dust, and the dust removal portion and the opening are provided on a wall surface of the cleaning unit substantially orthogonal to the moving direction of the filter. And wherein the door.

  According to the present invention, the dust attached to the filter is reliably removed by the rotating brush, and the suction part sucks the dust through the opening provided close to the base end part of the dust removal part. Dust separated from the rotating brush by the portion is sucked into the suction portion without accumulating around the rotating brush. That is, it is possible to prevent the dust that has been peeled off from the rotating brush from reattaching to the rotating brush and the filter, and it is not necessary to have a space for storing the dust in the vicinity of the rotating brush. And the expansion of the pedestal to the outside can be minimized. Moreover, since these filters are automatically cleaned, the filters can always be kept clean.

It is a perspective view of the showcase which concerns on Embodiment 1 of this invention. It is a front view of the mount frame of the showcase shown in FIG. It is a perspective view of the main-body part of the cleaning unit which concerns on Embodiment 1 of this invention, Fig.3 (a) is an assembly drawing, FIG.3 (b) is an exploded three-dimensional view. It is the perspective view which looked at the brush cover of the cleaning unit which concerns on Embodiment 1 of this invention from the back surface side. It is sectional drawing which shows the mode of dust removal by the cleaning unit which concerns on Embodiment 1 of this invention. It is a flowchart which shows the driving | running operation | movement of the cleaning unit which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the mode of dust removal by the cleaning unit which concerns on Embodiment 2 of this invention, Fig.7 (a) is sectional drawing when a filter is moving to the left direction, FIG.7 (b) is a filter. It is sectional drawing when is moving rightward. It is a perspective view which shows another form of the brush cover of the cleaning unit which concerns on Embodiment 1 of this invention. It is a perspective view which shows another form of the brush cover of the cleaning unit which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of a showcase according to Embodiment 1. FIG. FIG. 2 is a front view of the mount of the showcase shown in FIG.

  As shown in FIG. 1, a showcase 100 according to Embodiment 1 includes a box-shaped casing 1 having an upper surface opened, and a refrigerant circuit that is provided at the lower portion of the casing 1 and generates cool air to be supplied into the casing 1. It is comprised with the stand 2 accommodated. The casing 1 includes a display shelf 3 for displaying foods, a blower outlet 4 through which cool air generated by the refrigerant circuit is blown, and a suction port through which the cold air blown from the blower outlet 4 is sucked after passing over the display shelf 3 5 and a fluorescent lamp 6 that illuminates the display shelf 3. The cold air sucked from the suction port 5 is returned to the refrigerant circuit and blown out from the blowout port 4 again.

  A detachable inspection lid 7 is attached to the front surface of the gantry 2, and a compressor (not shown), a condenser 8, an evaporator (not shown) constituting the refrigerant circuit, and a refrigerant are installed in the gantry 2. An electrical box 9 containing a substrate for controlling a circuit, a fluorescent lamp, and the like is disposed. FIG. 1 shows a state in which the inspection lid 7 has been removed forward, and a plurality of air inlets 10 for supplying outside air to the condenser 8 are provided at locations where the inspection lid 7 faces the condenser 8 in the attached state. Is formed. Further, a blower (not shown) for supplying outside air to the condenser 8 via the air inlet 10 is disposed behind the condenser 8.

  A filter 11 that collects dust contained in the outside air supplied to the condenser 8 is provided between the front surface of the condenser 8, that is, between the air inlet 10 of the inspection lid 7 and the condenser 8. The filter 11 is detachably attached and is slidable in the left-right direction. A cleaning unit 20 for automatically removing dust adhering to the filter 11 is provided on the side of the filter 11 in the gantry 2.

  A power cord 12 for supplying commercial power to the electrical box 9 and the cleaning unit 20 is provided at the rear of the gantry 2.

  As shown in FIG. 2, the cleaning unit 20 is disposed on the side of the filter 11, moves the filter 11 in the left-right direction, and removes dust adhering to the filter 11. A suction part 22 for sucking the removed dust from the main body part 21 and a control part 23 for controlling the driving of the main body part 21 and the suction part 22 are provided. The main body 21 and the suction part 22 are connected by a hollow suction pipe 24, and the dust removed by the main body part 21 moves to the suction part 22 through the suction pipe 24.

  The filter 11 is formed to have a size that covers the front surface of the condenser 8, and is integrally provided on the outer periphery of the net portion 11a and a net-like net portion 11a that collects dust in the passing air. It is comprised with the frame part 11b hold | maintained in a shape. A rail 13 having a substantially U-shaped cross section having a groove portion that serves as a guide when the filter 11 moves in the left-right direction is provided at the bottom of the gantry 2. The filter 11 is attached to the groove portion of the rail 13 by accommodating the frame portion 11b at the lower end, and moves along the inner wall of the groove portion of the rail 13 when moving in the left-right direction. A rack gear (not shown) is attached to the frame 11b at the lower end of the filter 11 along the longitudinal direction.

  On the right side of the filter 11, a base point detection means 14 is provided. The base point detection means 14 detects whether the filter 11 is at the base point position (a position covering the front surface of the condenser 8). When the filter 11 is at the base point position, the filter base point detection signal is transmitted to the control unit. To 23. For the base point detection means 14, for example, a contact limit switch or a contactless reed switch is used.

  The main body 21 of the cleaning unit 20 is disposed on the left side of the filter 11, has a rotating shaft that extends substantially parallel to the vertical direction of the filter 11, and a rotating brush 26 that removes dust adhering to the filter 11. A motor 25 that rotates the rotary brush 26, a rack gear 27 that meshes with a rack gear attached to the frame portion 11b of the filter 11, and a motor 28 that rotates the rack gear 27. The motors 25 and 28 are controlled by the controller 23. When the motor 28 is driven, the rack gear 27 is sent by the rack gear 27 and the filter 11 moves in the lateral direction.

  The suction part 22 is provided with a dust collection container for collecting the sucked dust. This dust collection container is detachably attached to the suction portion 22, and dust collected in the dust collection container, that is, dust removed from the filter 11 can be easily disposed by removing the dust collection container. . Note that the suction unit 22 is provided with a sensor that detects the presence or absence of a dust collecting container, and a detection signal of this sensor is sent to the control unit 23.

  3A and 3B are perspective views of the main body of the cleaning unit according to the first embodiment. FIG. 3A is an assembly view and FIG. 3B is an exploded view. As shown in FIG. 3, the main body 21 of the cleaning unit 20 includes a brush cover 30 that covers the rotary brush 26 and a gear 33 that transmits the rotation of the motor 25 to the rotary brush 26. The gear box 31 is provided, and the motor cover 32 is provided behind the rotary brush 26 and covers the motors 25 and 28. The brush cover 30 and the motor cover 32 are each fixed to the gear box 31 with screws. The filter 11 passes between the rotary brush 26 and the motor cover 32 as indicated by an arrow A in FIG.

  The rotating brush 26 has a substantially cylindrical shape in which a plurality of brush hairs are implanted on the surface excluding the ends 26a and 26b of the rotating shaft. The rotating brush 26 is attached to a position where the tip of the brush hair comes into contact with the filter 11 that passes therethrough. By providing the rotating brush 26 in such a positional relationship, dust adhering to the filter 11 passing therethrough can be scraped off by brush hairs, and the scraped dust can be collected between the brush hairs.

  The brush cover 30 has a U-shaped cross-section in which both end portions are bent at a substantially right angle toward the rotary brush 26 so as to cover the rotary brush 26, and prevents dust from being attached to the rotary brush 26 from the outside. Is for. A slit 34 is formed on the front surface of the brush cover 30, and the state of the rotating brush 26 can be visually confirmed through the slit 34. Further, the brush cover 30 is provided with a bearing portion 35 into which the lower end portion 26 a of the rotating shaft of the rotating brush 26 is inserted and which supports the rotating brush 26. 3 shows the brush cover 30 in which four rectangular slits 34 are formed. However, the number and shape of the slits 34 are not limited to this, and a brush cover without the slits 34 may be used. Good.

  The gear box 31 includes a lower gear box 31 a to which the gear 33 and the motor 25 are attached, and an upper gear box 31 b that is attached to the upper surface of the lower gear box 31 a and covers the gear 33. A gear shaft (not shown) extending downward is provided at the center of the gear 33, and the tip of the gear shaft is inserted into a hole formed in the upper end portion 26 b of the rotating shaft of the rotating brush 26. . Thereby, the rotation of the motor 25 is transmitted to the rotating brush 26 via the gear 33 and the gear shaft.

  The motor cover 32 includes a motor cover lower part 32a to which the rack gear 27 and the motor 28 are attached, a motor cover front part 32b having a substantially U-shaped cross section to which the motor cover lower part 32a is attached, and a rear side of the motor cover front part 32b. A motor cover rear 32c attached to cover the motor 28 on the side. When the gear box 31 is attached to the upper portion of the motor cover 32, the motor 25 attached to the gear box 31 is accommodated in the motor cover 32.

  Note that the surfaces of the brush cover 30 and the motor cover 32 that face the rotating brush 26 are substantially parallel to each other and are also substantially parallel to the axial direction of the rotating shaft of the rotating brush 26. By doing in this way, the space around the rotating brush 26, especially the space in the front-rear direction can be minimized, and the main body 21 can be downsized.

  FIG. 4 is a perspective view of the brush cover of the cleaning unit according to Embodiment 1 as seen from the back side. As shown in FIG. 4, a plate-like dust removing portion 36 extending from the side wall 30 a of the brush cover 30 toward the center of the rotating brush 26 is provided on the back surface side of the brush cover 30. The dust removing unit 36 is for separating the dust scraped off from the filter 11 and attached to the rotating brush 26 from the rotating brush 26.

  The dust removing portion 36 has a tip portion 36 a formed in a comb-like shape, and is provided at a position where the tip portion 36 a contacts the brush bristles of the rotating brush 26. Further, the length of the dust removing portion 36 in the vertical direction is longer than the entire length of the rotating brush 26. The tip end portion 36 a of the dust removing portion 36 is not limited to the comb shape shown in FIG. 4, and may be any shape as long as dust attached to the rotating brush 26 can be separated from the rotating brush 26.

  An opening 37 is provided below the dust removing portion 36 in the vicinity of the base end portion 36b of the dust removing portion 36, and one end of the suction pipe 24 described with reference to FIG. . The dust separated from the rotary brush 26 by the dust removing unit 36 is sucked into the suction pipe 24 from the opening 37 by the suction force of the suction unit 22 and moves to the suction unit 22.

  FIG. 5 is a cross-sectional view illustrating a state of dust removal by the cleaning unit according to the first embodiment. 5 indicates the moving direction of the filter 11, and the arrow C indicates the rotating direction of the rotating brush 26. Although the motor cover 32 is omitted in FIG. 5, the filter 11 passes through the main body 21 (between the rotating brush 26 and the motor cover 32) of the cleaning unit 20.

  As shown in FIG. 5, the rotary brush 26 is rotationally driven in a rotation direction (arrow C) opposite to the moving direction (arrow B) of the filter 11 at the contact portion with the filter 11. As a result, the brush bristles come into contact with the dust against the movement of the dust, so that the dust can be removed from the filter 11 by scraping. Dust scraped off from the filter 11 is collected between the brush hairs of the rotary brush 26.

  The dust collected between the brush bristles of the rotating brush 26 is peeled off from the rotating brush 26 by the tip end portion 36a of the dust removing portion 36 as the brush bristle passes through the tip end portion 36a of the dust removing portion 36. . Here, when the tip portion 36a of the dust removing portion 36 is formed in a comb-teeth shape, not only the dust attached to the tip of the brush hair but also the dust buried between the brush hairs is surely peeled off by the comb-like convex portion. Can be effective.

  The dust separated from the rotating brush 26 by the dust removing unit 36 falls downward due to its own weight. As shown in FIG. 4, an opening 37 is provided on the lower side of the dust removing portion 36 in the vicinity of the base end portion 36b of the dust removing portion 36. The air is sucked into the suction pipe 24 from the opening 37 and collected in the dust collecting container of the suction part 22.

  Thus, by providing the opening 37 serving as a suction port for sucking dust in the vicinity of the base end portion 36b of the dust removing portion 36, the peeled dust can be sucked continuously. Moreover, since dust does not collect in the main body 21 of the cleaning unit 20, it is possible to prevent the dust from reattaching to the rotating brush 26 or the filter 11. Furthermore, since the space for accommodating dust in the main body 21 of the cleaning unit 20 is not required, the main body 21 of the cleaning unit 20 can be reduced in size.

  Further, by providing the dust removing portion 36 and the opening 37 on the side wall 30 a of the brush cover 30 that is substantially orthogonal to the moving direction of the filter 11, the suction tube 24 can be disposed on the side of the brush cover 30. Thereby, the expansion of the main body 21 of the cleaning unit 20 to the outside of the gantry 2 (downward in FIG. 5) due to the connection of the suction pipe 24 can be minimized, and the cleaning unit 20 can be downsized. .

  Next, control of the filter cleaning operation of the cleaning unit 20 will be described. FIG. 6 is a flowchart showing the operation of the cleaning unit according to the first embodiment. Note that the filter cleaning operation may be started either automatically or manually.In the case of automatic, for example, the cleaning operation is started in synchronization with the defrost operation of the cooler of the refrigerant circuit. For example, the cleaning operation is started when the user presses a cleaning button provided in the control unit 23.

  When the cleaning operation of the filter 11 is started, first, the control unit 23 drives the motor 28 to move the filter 11 to the right to perform the reference point of the filter 11 (step S1). This base pointing is performed until a filter base pointing detection signal is sent from the base point detecting means 14 to the control unit 23 (step S2). When the base point detection signal is sent from the base point detection means 14, the control unit 23 determines that the base point search is completed, and stops driving the motor 28 (step S3).

  When the reference point of the filter 11 is completed, the control unit 23 drives the motor 25, the motor 28, and the suction unit 22, and starts cleaning the filter 11 (step S4). At this time, if the dust collecting container of the suction unit 22 has been removed, error notification is performed without driving the motor 25, the motor 28, and the suction unit 22.

  The rotation of the rotary brush 26 is started by driving the motor 25, the movement of the filter 11 in the left direction is started by driving the motor 28, and the suction of dust is started by driving the suction unit 22. As shown in FIG. 5, the rotating brush 26 rotates clockwise and sends dust collected from the filter 11 to the dust removing unit 36. The dust removing unit 36 separates the dust from the rotating brush 26, and the suction unit 22 continuously sucks the separated dust.

  Simultaneously with these driving operations, the timer built in the control unit 23 starts counting, and the driving of the motor 25, the motor 28, and the suction unit 22 is continued until 150 seconds have elapsed from the start of the movement of the filter 11 (step S5). ). When 150 seconds have elapsed from the start of the movement of the filter 11, the control unit 23 stops driving the motor 25 and the motor 28, and the operations of the rotating brush 26 and the filter 11 are stopped (step S6). At this time, the driving of the suction unit 22 is continued, and the suction of dust is continued.

  Although the time from the start of movement of the filter 11 to the stop is 150 seconds, the time is not limited to this, and it may be the time until the entire net portion 11a of the filter 11 passes through the rotating brush. Further, an end point detection unit such as a sensor for detecting the completion of movement of the filter 11 instead of time may be separately provided, and the movement of the filter 11 may be stopped by a detection signal sent from the end point detection unit.

  When the movement of the filter 11 in the left direction is completed, the stopped state is maintained for 0.5 seconds from the completion (step S7). Thereafter, the control unit 23 drives the motor 28 in the reverse direction, and the movement of the filter 11 in the right direction is started (step S8). The filter 11 is moved in the right direction until a filter base point detection signal is sent from the base point detection means 14 to the control unit 23 (step S9).

  At this time, since the motor 25 is not driven, the rotating brush 26 is in a free state, and rotates clockwise (arrow C) following the filter 11 moving in the right direction. As a result, when small dust remains in the filter 11, when the filter 11 returns to the base position, the dust can be attached to the rotating brush 26 and similarly sucked by the suction portion 22. 11 can be made cleaner.

  When a base point detection signal is sent from the base point detection means 14, the control unit 23 determines that the filter 11 has moved to the base point, and stops driving the motor 28 and the suction unit 22 (step S10). In this way, a series of operations are automatically performed, and the filter cleaning operation ends.

  Thus, in the showcase 100 according to the first embodiment, the filter 11 is automatically cleaned, so that the filter 11 can always be kept clean. Further, in the filter cleaning operation, the suction unit 22 is driven in conjunction with the operation of the rotary brush 26, and the dust separated from the rotary brush 26 is discharged out of the main body 21 of the cleaning unit 20. While preventing reattachment to the filter 11, the main body 21 of the cleaning unit 20 does not need a space for storing dust, and the cleaning unit 20 can be downsized.

Embodiment 2. FIG.
In the showcase according to the second embodiment, the dust removing portion provided in the main body of the cleaning unit is arranged at the approximate center of the opening to which the suction pipe is connected. By using the cleaning unit having such a configuration, it is possible to suck the dust peeled off from the rotating brush with the suction part in both the right rotation and the left rotation of the rotating brush. Thereby, not only when the filter is moved in the left direction but also when the filter is moved in the right direction, the dust can be scraped with the rotating brush, and the cleaning performance is improved. Hereinafter, the showcase provided with this cleaning unit will be described.

  7 is a cross-sectional view showing how dust is removed by the cleaning unit according to the second embodiment. FIG. 7 (a) is a cross-sectional view when the filter is moving leftward, and FIG. 7 (b) is a filter. It is sectional drawing when is moving rightward. In addition, the same code | symbol is attached | subjected to the same structure as FIG. 5, and description is abbreviate | omitted. Moreover, the arrangement | positioning location of the filter 11 and the cleaning unit 20 (the main-body part 21, the suction part 22, the control part 23, and the suction pipe 24) in the mount frame 2 of the showcase 100 is the same as FIG. 2, and description is abbreviate | omitted.

  In FIG. 7, arrows B and D indicate the moving direction of the filter 11, and arrows C and F indicate the rotating direction of the rotating brush 26. 7 shows a state in which the filter 11 passes through the main body 21 (between the rotating brush 26 and the motor cover 32) of the cleaning unit 20, and the motor cover 32 is omitted as in FIG.

  As shown in FIG. 7, the main body portion 21 of the cleaning unit 20 according to the second embodiment has a dust removal portion so that the base end portion 38 b is positioned at the approximate center of the opening width of the opening portion 37 when viewed in cross section. 38 is provided. The dust removing portion 38 has a plate shape, and the tip end portion 38 a is in contact with the brush bristles of the rotating brush 26. As in the first embodiment, the tip end portion 38a may be formed in a comb shape.

  As shown in FIG. 7, when the filter 11 moves in the left direction (arrow B), the rotating brush 26 rotates in the rotation direction (arrow C) opposite to the moving direction of the filter 11 at the contact portion with the filter 11. Driven. When the filter 11 moves in the right direction (arrow D), it is rotationally driven in the reverse rotation direction (arrow F). Thereby, in either case of the movement of the filter 11 in the left-right direction, the brush hair can be scraped off by bringing the bristles into contact with the dust against the movement of the dust.

  The dust collected between the brush hairs of the rotating brush 26 is peeled off from the rotating brush 26 when passing through the tip end portion 38a of the dust removing portion 38. Since the base end portion 38 b of the dust removing portion 38 is located at the approximate center of the opening 37, the dust peeled off by the dust removing portion 38 interferes with the dust removing portion 38 regardless of the rotation direction of the rotary brush 26. Instead, the suction portion 22 is sucked through the opening 37. Thus, since the filter 11 is cleaned twice by the rotating brush 26 rotated in the direction opposite to the moving direction of the filter 11 during one reciprocating movement of the filter 11, the cleaning efficiency of the cleaning unit 20 is improved. Can be improved.

  Further, as shown in FIG. 7A, small dust or dust strongly adhered to the filter 11 may not be collected by the rotating brush 26 when the filter 11 moves to the left. Even in such a case, as shown in FIG. 7B, when moving to the right, by scraping with the rotating brush 26 rotated in the opposite direction to that in FIG. These dusts can be reliably collected, and the cleaning performance of the cleaning unit 20 can be improved.

  Next, another embodiment of the brush cover of the cleaning unit according to the first and second embodiments will be described. 8 and 9 are perspective views showing other forms of the brush cover of the cleaning unit according to Embodiment 1. FIG. 8 and 9 are perspective views of the brush cover as seen from the back side as in FIG. 4, and the same components as those in FIG.

  As shown in FIG. 8, the brush cover 30a is provided with three openings 37a to 37c in the vicinity of the base end part 36b of the dust removing part 36, and suction openings 24a to 24c are provided in the openings 37a to 37c, respectively. Are connected at one end. The three suction tubes 24 a to 24 c are connected to the suction unit 22 as a single tube on the way.

  By providing three openings 37a to 37c respectively corresponding to the upper part, the central part, and the lower part of the dust removing part 36, the dust separated at the upper, central and lower parts of the dust removing part 36 is placed at that position. It is possible to suck each through the close openings 37a to 37c, and the dust suction efficiency can be improved. Specifically, the dust separated at the upper part of the dust removing unit 36 is sucked into the suction tube 24a from the opening 37a, and the dust separated at the center of the dust removing unit 36 is sucked into the suction tube 24b from the opening 37b, Dust separated at the lower part of the dust removing unit 36 is sucked into the suction pipe 24c from the opening 37c.

  As another form, as shown in FIG. 9, the brush cover 30b is provided with an opening 37d that opens along the base end portion 36b of the dust removing portion 36, and a suction cover 39 that covers the entire opening 37d. . The suction cover 39 is connected to the other end of the suction tube 24d, one end of which is connected to the suction part 22. Dust that has passed through the opening 37d passes through the suction cover 39 and is sucked into the suction tube 24d.

  Thus, by providing the opening 37d close to the entire longitudinal direction of the base end portion 36b of the dust removal portion 36, it is possible to generate a uniform suction force on the entire base end portion 36b of the dust removal portion 36. Thus, the dust separated by the dust removing unit 36 can be sucked more efficiently.

  The configurations of the brush covers 30a and 30b shown in FIGS. 8 and 9 can also be applied to the brush cover 30 of the second embodiment, and have the same effect. When applied to the brush cover 30 of the second embodiment, as shown in FIG. 7, the base end portion 38b is positioned substantially at the center of the opening width of the openings 37a to 37d when viewed in cross section. A dust removing unit 38 is provided.

  1 Casing, 2 bases, 3 display shelves, 4 outlets, 5 suction ports, 6 fluorescent lamps, 7 inspection lids, 8 condensers, 9 electrical box, 10 inlets, 11 filters, 12 power cords, 13 rails, 14 base points Detection means, 20 cleaning unit, 21 main body, 22 suction unit, 23 control unit, 24 suction tube, 25 motor, 26 rotating brush, 27 rack gear, 28 motor, 30 brush cover, 31 gear box, 32 motor cover, 33 Gear, 34 Slit, 35 Bearing part, 36 Dust removal part, 37 Opening part, 38 Dust removal part, 39 Suction cover, 100 Showcase.

Claims (7)

A condenser provided in a gantry at the bottom of the showcase, a filter disposed on the front surface of the condenser and provided to be movable in the left-right direction, and a cleaning unit provided at a position through which the moving filter passes. The cleaning unit is provided at a position where the cleaning unit abuts against the filter passing therethrough , and includes a rotating brush that removes dust adhering to the filter and a plate-like member, and a tip portion contacts the rotating brush, and the rotating A dust removing unit for separating dust attached to the brush, an opening provided in the vicinity of the base end of the dust removing unit, and a suction unit connected to the opening for sucking the dust separated by the dust removing unit And the dust removing portion and the opening portion are provided on a wall surface of the cleaning unit substantially orthogonal to the moving direction of the filter. 2. The showcase according to claim 1, wherein the dust removing portion of the cleaning unit has the base end portion positioned substantially at the center of the opening width of the opening in a cross-sectional view. The showcase according to claim 1 or 2, wherein a plurality of the openings of the cleaning unit are provided. The showcase according to any one of claims 1 to 3 , wherein the opening of the cleaning unit is opened in a longitudinal direction along the base end of the dust removing portion. The showcase according to any one of claims 1 to 4, wherein a tip portion of the dust removing portion of the cleaning unit is formed in a comb shape. The showcase according to claim 1, wherein the suction unit of the cleaning unit performs a suction operation in conjunction with driving of the rotating brush. The showcase according to any one of claims 1 to 6, wherein a dust collecting container for storing sucked dust is detachably provided in the suction portion of the cleaning unit.

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