Cover equipment

Abstract

The present invention provides a cover device that can improve the comfort experienced by passengers inside the elevator car while the fan is operating. [Solution] The cover device is a device that covers a part of a blower installed at the top of an elevator car to send air into the elevator car, and comprises a mesh body having a metal mesh and a cooler attached to the mesh body to cool the mesh body, and the mesh body is attached to the blower such that the mesh portion of the mesh body covers the air supply area, which is the surface that the blower draws in air from the elevator shaft.

Description

Technical Field

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[0001] The present disclosure relates to a cover device attached to a blower provided in an elevator car.

Background Art

[0002] Patent Document 1 discloses a blower provided in an elevator car. The blower is disposed in an air passage between an air inlet facing the hoistway and an air outlet inside the car. According to the blower, air can be introduced from the outside to the inside of the car.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Dust floats inside the hoistway, and the dust can accumulate inside the blower. However, it is difficult to clean the inside of the blower described in Patent Document 1. Also, in summer when the blower can be operated, the internal temperature of the hoistway is high. Therefore, when the blower is operated, hot air containing dust may be introduced into the car, which may give discomfort to passengers.

[0005] The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a cover device that can improve the comfort felt by passengers inside the car when the blower is performing a blowing operation.

Means for Solving the Problems

[0006] The cover device relating to this disclosure is a device that covers a part of a blower installed at the top of an elevator car to send air into the elevator car, and comprises a mesh body having a metal mesh and a cooler attached to the mesh body for cooling the mesh body. The mesh body is attached to the blower such that the mesh portion of the mesh body covers the air intake area, which is the surface from which the blower draws air in from the elevator shaft. [Effects of the Invention]

[0007] According to this disclosure, the mesh of the body is installed so as to cover the air intake area. The cooler cools the mesh of the body. This can improve the comfort felt by passengers inside the car when the fan is operating. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram shows the main part of an elevator to which the cover device in Embodiment 1 is applied. [Figure 2] This is an example of a blower to which the cover device in Embodiment 1 is attached. [Figure 3] This is a plan view of the cover device in Embodiment 1. [Figure 4] This is a perspective view of the cover device in Embodiment 1 attached to the blower. [Figure 5] This is a perspective view of a modified example of Embodiment 1 in which the cover device is attached to the blower. [Figure 6] This is an example of a blower to which the cover device in Embodiment 2 is attached. [Figure 7] This is a perspective view of the cover device in Embodiment 2 attached to the blower. [Modes for carrying out the invention]

[0009] The embodiments for implementing this disclosure will be described with reference to the attached drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals. The explanation of such parts will be simplified or omitted as appropriate.

[0010] Embodiment 1. Figure 1 shows the main part of an elevator to which the cover device in Embodiment 1 is applied. Figure 2 is an example of a blower to which the cover device in Embodiment 1 is attached. Figure 3 is a plan view of the cover device in Embodiment 1. Figure 4 is a perspective view of the cover device in Embodiment 1 attached to the blower.

[0011] As shown in Figure 1, the cover device 1 is applied to the elevator 50. In the elevator 50, the hoistway 51 penetrates each floor of a building (not shown). The car 52 is located inside the hoistway 51. The car 52 moves up and down inside the hoistway 51 with people inside.

[0012] The blower 60 is installed on the top of the elevator car 52, particularly on the top surface of the elevator car 52. For example, the blower 60 operates in the summer. In blower operation, the blower 60 draws in air from inside the elevator shaft 51 through the air intake. In blower operation, the blower 60 blows the drawn-in air into the elevator car 52. For example, the blower 60 does not operate in the winter.

[0013] The cover device 1 is attached to the blower 60. The cover device 1 covers at least the air intake of the blower 60. The cover device 1 comprises a mesh body 2 and a cooler 3. The mesh body 2 has a mesh structure. The cooler 3 cools the mesh body 2.

[0014] The mesh body 2 traps dust floating inside the hoistway 51 with its mesh, thereby preventing the dust from entering the blower 60. Furthermore, when the blower 60 is operating, the air supplied through the cooled mesh body 2 is cooled, causing the air blown from the blower 60 into the cage 52 to cool down.

[0015] Next, the blower 60 in Embodiment 1 will be described in more detail with reference to FIG. 2. The blower 60 does not have a function of adjusting the temperature of air. The blower 60 in the example shown in FIG. 2 is a long cross-flow fan. In this example, the blower 60 has an outer shape that can be housed in a substantially rectangular parallelepiped box. The housing 61 of the blower 60 has at least a side surface 62, an upper surface 63, and another side surface 64. The other side surface 64 faces the opposite direction to the side surface 62. The upper surface 63 is connected to the side surface 62 and the other side surface 64, respectively.

[0016] The blower 60 is fixed to the upper part of the basket 52 by the bottom surface 65 of the housing 61 that faces the opposite direction to the upper surface 63. A fan 66 is provided inside the housing 61. A part of the upper surface 63 and the side surface 62 are composed of a wire mesh part 67. The wire mesh part 67 has a mesh size that does not allow a human finger or the like to enter.

[0017] The blower 60 has an air supply area 68 that is a surface composed of at least a part of the surface of the wire mesh part 67, that is, the upper surface 63 and the side surface 62. When the blowing operation is being performed, the blower 60 sucks air from the air supply area 68 by the rotation of the fan 66. The air existing around the blower 60 passes through the air supply area 68, passes through the fan 66, and is blown into the inside of the basket 52.

[0018] Next, the cover device 1 will be described in more detail with reference to FIGS. 3 and 4. In FIG. 3, the illustration of the blower 60 is omitted. As shown in FIG. 3, the cover device 1 includes a mesh body 2 and a cooler 3.

[0019] The mesh body 2 has a first mesh sheet 4a, a second mesh sheet 4b, a plate body 5, a first connector 6a, a second connector 6b, and a fixture 7. The mesh body 2 in the present embodiment is configured to correspond to the blower 60. That is, the shape of each configuration corresponds to the dimensions of the blower 60.

[0020] The first mesh sheet 4a has a rectangular plate shape. The first mesh sheet 4a has a metal mesh. For example, the entire first mesh sheet 4a is a mesh. Air can pass through the meshes of the first mesh sheet 4a. The meshes of the first mesh sheet 4a are made of a metal with high thermal conductivity such as stainless steel, copper, aluminum, etc. For example, the mesh size may be any size from 18 meshes to about 30 meshes. The first mesh sheet 4a is a plate that is the same width as or wider than the side surface 62 of the blower 60. That is, the longitudinal length of the first mesh sheet 4a is the same as or longer than the longitudinal length of the side surface 62. The lateral length of the first mesh sheet 4a is the same as or longer than the lateral length of the side surface 62. In this case, the meshes of the first mesh sheet 4a are wider than the air supply region 68 present on the side surface 62.

[0021] The second mesh sheet 4b has a rectangular plate shape. The second mesh sheet 4b has a metal mesh similar to the first mesh sheet 4a. The second mesh sheet 4b is a plate that is the same width as or wider than the upper surface 63 of the blower 60. That is, the longitudinal length of the second mesh sheet 4b is the same as or longer than the longitudinal length of the upper surface 63. The lateral length of the second mesh sheet 4b is the same as or longer than the lateral length of the upper surface 63. In this case, the meshes of the second mesh sheet 4b are wider than the air supply region 68 present on the upper surface 63. Note that the first mesh sheet 4a and the second mesh sheet 4b may have the same dimensions.

[0022] The plate body 5 has a rectangular plate shape. For example, the plate body 5 has the same longitudinal and lateral dimensions as the first mesh sheet 4a. The plate body 5 is made of a metal such as stainless steel, copper, aluminum, etc. Note that the plate body 5 may have the same mesh as the first mesh sheet 4a.

[0023] The first connector 6a connects the first mesh sheet 4a and the second mesh sheet 4b. The first mesh sheet 4a and the second mesh sheet 4b are connected so as to be rotatable relative to each other with respect to the first connector 6a. For example, the first connector 6a is rod-shaped. The first connector 6a connects one end of the long side of the first mesh sheet 4a, which is a horizontal side, to one end of the long side of the second mesh sheet 4b, which is a horizontal side.

[0024] The second connector 6b connects the second mesh sheet 4b and the plate 5. The second mesh sheet 4b and the plate 5 are connected so as to be rotatable relative to each other with respect to the second connector 6b. For example, the second connector 6b is rod-shaped. The second connector 6b connects the other end of the longer side of the second mesh sheet 4b to one end of the longer side of the plate 5. The other end of the second mesh sheet 4b is the end opposite to the one end of the second mesh sheet 4b.

[0025] The mounting fixture 7 detachably attaches the mesh body 2, consisting of the first mesh sheet 4a, the second mesh sheet 4b, and the plate body 5, to the blower 60. For example, the mounting fixture 7 is a magnet. In this case, multiple mounting fixtures 7 are fixed to the first mesh sheet 4a, the second mesh sheet 4b, and the plate body 5, respectively.

[0026] For example, the cooler 3 uses a Peltier element for cooling. A Peltier element is an element that transfers heat from one surface to the other using electrical energy. The cooler 3 may also be configured to cool the mesh body 2 using other cooling mechanisms such as a heat pump. The cooler 3 includes a cooling element 8, a heat dissipation element 9, a controller 10, and a power line 11.

[0027] In this embodiment, the cooler 3 has 12 cooling elements 8. Four cooling elements 8 are fixed to the first mesh sheet 4a, the second mesh sheet 4b, and the plate body 5 by being attached to them. For example, each cooling element 8 is one of a pair of surfaces on which heat transfer occurs by a Peltier element. The cooling elements 8 are able to exchange heat with the object to which they are attached, whichever is the first mesh sheet 4a, the second mesh sheet 4b, or the plate body 5. The cooling elements 8 cool the first mesh sheet 4a, the second mesh sheet 4b, and the plate body 5, which are components of the mesh body 2.

[0028] The heat dissipation element 9 releases the heat generated by the cooling by the cooling element 8. When the cooler 3 uses a cooling mechanism utilizing a Peltier element, the heat dissipation element 9 is the other of a pair of surfaces on which heat transfer occurs by the Peltier element. For example, the heat dissipation element 9 is provided on the back surface of the 12 cooling elements 8. The heat dissipation element 9 releases the heat absorbed by the corresponding cooling element 8.

[0029] Furthermore, if the cooler 3 uses a cooling mechanism such as a heat pump, the heat dissipation element 9 may be a mechanism such as fins for heat dissipation.

[0030] The controller 10 controls the operating state of the cooler 3. Specifically, the controller 10 switches the cooling operation by the cooling element 8 on and off. The controller 10 switches the cooling operation output of the cooling element 8 to 30%, 50%, 80%, and 100%. The controller 10 has operation buttons to accept operations to switch between various states. The controller 10 displays information such as the current operating state and cooling capacity by the illumination of lights, etc.

[0031] The controller 10 may also control the operation of the cooler 3 in conjunction with the operating status of the blower 60. That is, the controller 10 is set to the ON state when the blower 60 is operating. In this case, the cooler 3 performs cooling operation. The controller 10 is set to the OFF state when the blower 60 is not operating. In this case, the cooler 3 does not perform cooling operation.

[0032] The power line 11 is connected to a power terminal located on the top of the cage 52. The power line 11 supplies power from the power terminal to the cooler 3.

[0033] As shown in Figure 4, the cover device 1 is attached to the blower 60 so as to cover the blower 60. At this time, the mounting device 7, which is not shown in Figure 4, is attached to the surface of the blower 60 by magnetic force, thereby attaching the mesh body 2 to the surface of the blower 60. Note that the part of the blower 60 that is hidden by the cover device 1 is not shown in the illustration.

[0034] Specifically, in the installed state, the first mesh sheet 4a is attached to the side surface 62 so as to face the side surface 62. In this state, the mesh portion of the first mesh sheet 4a covers the air supply area 68 on the side surface 62.

[0035] The second mesh sheet 4b is attached to the upper surface 63 so as to face the upper surface 63. In this state, the mesh portion of the second mesh sheet 4b covers the air supply area 68 on the upper surface 63.

[0036] The plate 5 is attached to the other side 64 so as to be in contact with the other side 64. For example, the plate 5 is attached so as to be in contact with as wide an area of ​​the metal portion of the other side 64 as possible.

[0037] If the cover device 1 is not provided and the blower 60 is installed exposed on top of the elevator car 52, dust floating inside the elevator shaft 51 will accumulate between the fans 66, etc. Cleaning by workers performing inspection work may not adequately clean the inside of the blower 60, such as between the fans 66. In addition, if a see-through type elevator shaft 51 is installed, the internal temperature of the elevator shaft 51 will rise in the summer. If the blower 60 starts blowing air in the summer with accumulated dust, there is a risk that hot air containing dust will be blown into the elevator car 52. In this case, passengers inside the elevator car 52 may experience discomfort.

[0038] In this embodiment, a cover device 1 is provided, and the mesh portion of the first mesh sheet 4a and the mesh portion of the second mesh sheet 4b cover the air supply area 68 of the blower 60. When the blower 60 is not operating, dust that floats inside the hoistway 51 accumulates on the mesh body 2 and does not accumulate inside the blower 60.

[0039] As the fan 66 of the blower 60 rotates, an airflow is formed that passes through the mesh portion of the first mesh sheet 4a or the second mesh sheet 4b, enters the inside of the blower 60, and is then blown into the inside of the car 52. When the cooler 3 performs cooling operation in this state, the mesh portions of the first mesh sheet 4a and the second mesh sheet 4b are cooled overall. The airflow is cooled by the mesh portion of the first mesh sheet 4a or the second mesh sheet 4b and then blown into the inside of the car 52. Passengers inside the car 52 experience comfort from being exposed to air that is cooler than the outside air.

[0040] Here, because the mesh of the first mesh sheet 4a and the mesh of the second mesh sheet 4b are made of metal with high thermal conductivity, the temperature drops even outside the vicinity of the cooling element 8. In addition, because the first mesh sheet 4a and the second mesh sheet 4b are mesh, the surface area in contact with the airflow increases, so the cover device 1 can cool the airflow more efficiently.

[0041] Furthermore, the plate body 5 is cooled by the cooler 3. The plate body 5 comes into contact with the other side surface 64, cooling the other side surface 64, which lowers the temperature inside the blower 60. As a result, the airflow can also be cooled inside the blower 60.

[0042] According to Embodiment 1 described above, the mesh body 2 is installed such that the mesh portion of the mesh body 2 covers the air supply area 68. Specifically, the mesh portion of the first mesh sheet 4a covers the air supply area 68 on the side 62, and the mesh portion of the second mesh sheet 4b covers the air supply area 68 on the top surface 63. For example, before the blower 60 is operated, the workers on site clean the dust accumulated on the mesh body 2. At this time, the workers can clean the dust more easily and effectively than in the conventional case where dust accumulated on the fan 66 of the blower 60 is collected. As a result, dust is prevented from being blown into the cage 52 by the blower 60. The cooler 3 also cools the mesh body 2. Because the air supply area 68 is covered with the mesh portion of the mesh body 2 cooled by the cooler 3, cooled air is blown into the cage 52 when the blower 60 is operated. As a result, the cover device 1 allows clean and cool air to be blown into the car 52 when the blower 60 is operating. In other words, the cover device 1 can improve the comfort felt by passengers inside the car 52 when the blower 60 is operating.

[0043] Furthermore, the cooler 3 cools the plate body 5. The plate body 5 is attached to the blower 60 so as to be in contact with another side surface 64. Therefore, the cover device 1 can cool the blower 60.

[0044] Furthermore, the cooler 3 has a Peltier element. Since cooling is performed by the Peltier element, a large-scale cooling mechanism is unnecessary. As a result, the cover device 1 can be constructed inexpensively and simply in a small space.

[0045] Furthermore, the cooler 3 performs cooling operation in conjunction with the blower 60's blower operation. This prevents the cover device 1 from running unnecessarily when the blower is not operating.

[0046] Furthermore, the heat dissipation element 9, which is the heat dissipation part, may be provided at a location away from the cooling element 8 and separate from the air supply area 68. For example, the heat dissipation part may be attached to the plate body 5. In this case, in the state shown in Figure 4, the plate body 5 and the heat dissipation part are attached at a location that does not overlap with the air supply area 68. As a result, it is possible to suppress the heating of the airflow blown into the cage 52 by the heat released from the heat dissipation part.

[0047] In the first embodiment, the blower 60 does not have to be the shape shown in Figure 2, as long as it has an external shape that can be housed in a roughly rectangular box and the air supply area 68 is provided on two of its surfaces. For example, a cross-flow fan with a roughly rectangular external shape and a bottom surface 65 fixed to the upper surface of the cage 52 may be used as the blower 60.

[0048] The controller 10 may also control the direction in which the Peltier element transfers heat. That is, by reversing the roles of the cooling element 8 and the heat dissipation element 9, a heating operation may be performed in which the cooling element 8 heats the mesh body 2. For example, in winter, when the heating operation is performed and the blower 60 is operated, the inside of the cage 52 is warmed. The controller 10 may display this operating status.

[0049] Furthermore, the mesh body 2 may have a structure in which multiple mesh sheets are layered. In this case, the distance the airflow travels through the mesh becomes longer. As a result, the cover device 1 can be cooled more strongly by the airflow.

[0050] Next, a modified example of Embodiment 1 will be described using Figure 5. Figure 5 is a perspective view of a modified example of Embodiment 1 in which the cover device is attached to the blower.

[0051] In a modified example, the cover device 1 further comprises a plurality of auxiliary sheets 20 and a plurality of auxiliary fasteners 21. The auxiliary sheets 20 remove more dust from the airflow.

[0052] The auxiliary sheet 20 is a fibrous sheet. The fibrous mesh of the auxiliary sheet 20 is finer than the mesh of the mesh body 2. The dimensions of the auxiliary sheet 20 are such that they cover the mesh portion of the mesh body 2. Specifically, one auxiliary sheet 20 is wider than the mesh portion of the first mesh sheet 4a. Another auxiliary sheet 20 is wider than the mesh portion of the second mesh sheet 4b.

[0053] The auxiliary fixing device 21 secures the auxiliary sheet 20 to the mesh body 2. For example, the auxiliary fixing device 21 may have a clip portion.

[0054] The auxiliary sheet 20 is positioned to cover the mesh portion of the mesh body 2 and is fixed to the mesh body 2 by the auxiliary fixing device 21. For example, the auxiliary sheet 20 and a part of the mesh body 2 are clamped together by the clip portion of the auxiliary fixing device 21, thereby allowing the auxiliary sheet 20 to be detachably fixed to the mesh body 2.

[0055] According to the modified embodiment 1 described above, the cover device 1 further comprises an auxiliary sheet 20 and an auxiliary fixing device 21. The auxiliary sheet 20 is fixed so as to cover the mesh portion of the mesh body 2. Dust floating inside the elevator shaft 51 accumulates on the auxiliary sheet 20, both when the blower 60 is not in operation and when it is in operation. Workers can easily clean the cover device 1 by simply replacing the auxiliary sheet 20 during cleaning.

[0056] Embodiment 2. Figure 6 shows an example of a blower to which the cover device in Embodiment 2 is attached. Figure 7 is a perspective view of the blower with the cover device in Embodiment 2 attached. Note that parts identical or corresponding to parts in Embodiment 1 are denoted by the same reference numerals. Descriptions of these parts are omitted.

[0057] In Embodiment 2, as shown in Figure 6, the blower 60 is a sirocco fan having an air supply area 68 on its side. The air supply area 68 is circular.

[0058] As shown in Figure 7, the cover device 1 is shaped to match the shape of the blower 60, which is shaped as in Embodiment 2. Specifically, the mesh body 2 is a disc with a metal mesh. The cooling element 8 of the cooler 3 is attached to the mesh body 2. The cooler 3 cools the mesh body 2.

[0059] Even with a blower 60 like the one in Embodiment 2, the cover device 1 can improve the comfort felt by passengers inside the car 52 when the blower 60 is operating.

[0060] To summarize the above explanation, the possible configurations of the technology relating to this disclosure include the configurations listed below as appendices. (Note 1) A device that covers a part of a blower installed at the top of an elevator car in order to send air into the elevator car, A mesh body having a metal mesh, A cooler attached to the mesh body for cooling the mesh body, Equipped with, The mesh body is attached to the blower such that the mesh portion of the mesh body covers the air intake area, which is the surface from which the blower draws air in from the elevator shaft. Cover equipment. (Note 2) The blower has its side and top surfaces as the air supply areas, The aforementioned mesh body is A first mesh sheet having a metal mesh and exhibiting a plate-like shape that is wider than the air supply area on the side, A second mesh sheet having a metal mesh and exhibiting a plate-like shape that is wider than the air supply area on the upper surface, A first connector that connects the first mesh sheet and the second mesh sheet, It has, The mesh body is attached to the blower such that the mesh portion of the first mesh sheet covers the air supply area on the side, and the mesh portion of the second mesh sheet covers the air supply area on the top surface. Cover equipment as described in Appendix 1. (Note 3) A plate-like metal body, A second connector for connecting the plate body to the end of the second mesh sheet opposite to the end to which the first connector is attached, Furthermore, The blower has another side opposite to the aforementioned side, The cooler cools the plate body, The plate is attached to the blower such that the second mesh sheet is in contact with the other side surface. Cover equipment as described in Appendix 2. (Note 4) A plate-like body, A second connector for connecting the plate body to the end of the second mesh sheet opposite to the end to which the first connector is attached, Furthermore, The cooler further includes a heat dissipation section attached to the plate body that releases heat generated by the cooling of the mesh body, The plate is attached to the blower at a position that does not overlap with the air intake area of ​​the blower. Cover equipment as described in Appendix 2. (Note 5) The cooler has a Peltier element attached to the mesh body so as to be able to exchange heat with the mesh body. Cover equipment as described in any one of the items from Appendix 1 to Appendix 4. (Note 6) The cooler is linked to the blower so as to perform a cooling operation when the blower is in blowing operation, and not perform a cooling operation when the blower is not in blowing operation. A cover device as described in any one of the appendices 1 through 5. (Note 7) An auxiliary sheet made of fibrous material having dimensions that cover the mesh portion of the aforementioned mesh body, An auxiliary fixing device for fixing the auxiliary sheet to the mesh body, It also has the following features: A cover device as described in any one of the notes 1 through 6. [Explanation of Symbols]

[0061] 1 Cover equipment, 2 Mesh body, 3 Cooler, 4a First mesh sheet, 4b Second mesh sheet, 5 Plate body, 6a First connector, 6b Second connector, 7 Mounting fixture, 8 Cooling element, 9 Heat dissipation element, 10 Controller, 11 Power line, 20 Auxiliary sheet, 21 Auxiliary fixing fixture, 50 Elevator, 51 Hoistway, 52 Car, 60 Blower, 61 Enclosure, 62 Side, 63 Top, 64 Another side, 65 Bottom, 66 Fan, 67 Wire mesh section, 68 Air supply area

Claims

1. A device that covers a part of a blower installed at the top of an elevator car in order to send air into the elevator car, A mesh body having a metal mesh, A cooler attached to the mesh body for cooling the mesh body, Equipped with, The mesh body is attached to the blower such that the mesh portion of the mesh body covers the air intake area, which is the surface from which the blower draws air in from the elevator shaft. Cover equipment.

2. The blower has its side and top surfaces as the air supply areas, The aforementioned mesh body is A first mesh sheet having a metal mesh and exhibiting a plate-like shape that is wider than the air supply area on the side, A second mesh sheet having a metal mesh and exhibiting a plate-like shape that is wider than the air supply area on the upper surface, A first connecting member that connects the first mesh sheet and the second mesh sheet, It has, The mesh body is attached to the blower such that the mesh portion of the first mesh sheet covers the air supply area on the side, and the mesh portion of the second mesh sheet covers the air supply area on the top surface. The cover device according to claim 1.

3. A plate-like metal body, A second connector for connecting the plate body to the end of the second mesh sheet opposite to the end to which the first connector is attached, Furthermore, The blower has another side opposite to the aforementioned side, The cooler cools the plate body, The plate is attached to the blower such that the second mesh sheet is in contact with the other side surface. The cover device according to claim 2.

4. A plate-like body, A second connector for connecting the plate body to the end of the second mesh sheet opposite to the end to which the first connector is attached, Furthermore, The cooler further includes a heat dissipation section attached to the plate body that releases heat generated by the cooling of the mesh body, The plate is attached to the blower at a position that does not overlap with the air intake area of ​​the blower. The cover device according to claim 2.

5. The cooler has a Peltier element attached to the mesh body so as to be able to exchange heat with the mesh body. A cover device according to any one of claims 1 to 4.

6. The cooler is linked to the blower so as to perform a cooling operation when the blower is in blowing operation, and not perform a cooling operation when the blower is not in blowing operation. A cover device according to any one of claims 1 to 4.

7. An auxiliary sheet made of fibrous material having dimensions that cover the mesh portion of the aforementioned mesh body, An auxiliary fixing device for fixing the auxiliary sheet to the mesh body, It also has the following features: A cover device according to any one of claims 1 to 4.

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