JP2021021572A - Ventilator - Google Patents

Abstract

To provide a ventilator excellent in maintainability.SOLUTION: A ventilator 10 includes a center unit 21, a hood 22, and a cylindrical body 23. The center unit 21 is equipped with a sensor part 12 for measuring at least one of temperature and humidity of the atmosphere. The hood 22 is arranged on an upper part of the center unit 21. The cylindrical body 23 is arranged on a lower part of the center unit 21. The ventilator 10 includes a disassembly and assembly mechanism which enables an assembled state of the center unit 21, the hood 22 and the cylindrical body 23 and a disassembled state of the center unit 21, the hood 22 and the cylindrical body 23 by displacing at least one component among a plurality of components in the center unit 21, the hood 22 and the cylindrical body 23 without using a tool.SELECTED DRAWING: Figure 2

Description

The present invention relates to a ventilation tube.

Meteorological observation devices that measure the temperature and humidity of the atmosphere may show values different from the actual temperature and humidity when the thermometer or hygrometer receives sunlight. Therefore, the influence of solar radiation is prevented by using a ventilation tube that houses a thermometer and a hygrometer.

For example, Patent Document 1 describes a ventilation cylinder including a center unit to which a thermometer and a hygrometer are attached, a hood provided on the upper part of the center unit, and a cylinder provided on the lower part of the center unit. ing. A fan motor is built in the upper part of the center unit. When the fan motor is driven, air is sucked from the air suction portion provided at the lower end of the cylinder, and air is discharged from the gap formed between the hood and the center unit. The ventilation tube described in Patent Document 1 is configured to forcibly circulate air, so that temperature and humidity can be accurately measured.

Japanese Unexamined Patent Publication No. 10-090074

However, in the ventilation cylinder described in Patent Document 1, various components such as a center unit, a hood, a cylinder, and a fan motor are connected by screws, so that a tool such as a screwdriver is used for maintenance. It was necessary to attach / remove screws, and there was room for improvement in maintainability.

An object of the present invention is to provide a ventilation cylinder having excellent maintainability.

The ventilation cylinder according to the present invention is provided with a center unit provided with a sensor unit for measuring at least one of the temperature and humidity of the atmosphere, a hood provided above the center unit, and a lower portion of the center unit. The center unit, the hood, and the plurality of parts provided in the cylinder, the center unit, the hood, and the cylinder are displaced by displacement of at least one of the parts without using a tool. It includes an assembled state in which the cylinder body is assembled, and an disassembled assembly mechanism capable of disassembling the center unit, the hood, and the cylinder body.

Since the ventilation cylinder according to the present invention can be disassembled and assembled without using a tool such as a screwdriver, it is excellent in maintainability.

It is a perspective view of the ventilation cylinder which carried out this invention. It is a perspective view which shows the ventilation cylinder which carried out the present invention in an exploded manner. It is a perspective view for demonstrating the structure of the upper part of a center unit. It is a top view and a cross-sectional view of a positioning ring. It is a plan view and a sectional view of a receiving metal fitting. It is sectional drawing of the cylinder body before inserting an inner cylinder into an outer cylinder. It is sectional drawing of the cylinder body after inserting an inner cylinder into an outer cylinder. It is sectional drawing of the cylinder body before attaching the receiving metal fitting to the outer cylinder. It is sectional drawing of the cylinder body after attaching the receiving metal fitting to the outer cylinder. It is sectional drawing of the upper part of the center unit before mounting a fan motor to a fan motor mounting part. It is sectional drawing of the upper part of the center unit after mounting a fan motor to a fan motor mounting part.

In FIG. 1, the ventilation tube 10 is used for a meteorological observation device 11 that measures the temperature and humidity of the atmosphere. The meteorological observation device 11 has a sensor unit 12 and a fan motor 13 inside the ventilation cylinder 10.

The ventilation cylinder 10 is attached to a support column 15 erected on the ground 14, and is arranged at a predetermined height from the ground 14. In the ventilation cylinder 10, the side with the ground 14 is the lower side, and the side with the sky is the upper side.

The sensor unit 12 has at least one of a thermometer for measuring the temperature of the atmosphere and a hygrometer for measuring the humidity of the atmosphere. That is, the sensor unit 12 measures at least one of the temperature and humidity of the atmosphere. An electric thermometer is used as the thermometer. An electric hygrometer is used as the hygrometer. The sensor unit 12 is mounted inside the ventilation cylinder 10 using a sensor mounting member (not shown).

The fan motor 13 forcibly circulates air between the inside and the outside of the ventilation cylinder 10. The fan motor 13 has a substantially square shape in a plan view, for example. The fan motor 13 sucks air from the lower side of the ventilation cylinder 10. The air sucked into the ventilation cylinder 10 is discharged to the outer periphery of the ventilation cylinder 10 through the gap formed between the unit body 25 of the center unit 21 and the cover 36 of the hood 22, which will be described later. By circulating the air inside the ventilation cylinder 10, the sensor unit 12 can accurately measure the temperature or humidity.

As shown in FIG. 2, the ventilation cylinder 10 includes a center unit 21, a hood 22, and a cylinder 23. The hood 22, the center unit 21, and the cylinder 23 are formed of, for example, stainless steel.

In the ventilation cylinder 10, at least one of a plurality of parts provided in the center unit 21, the hood 22, and the cylinder 23 is displaced without using a tool, so that the center unit 21, the hood 22, and the cylinder 23 are displaced. It is provided with an disassembly and assembly mechanism that enables an assembled state (see FIG. 1) in which the above is assembled and a disassembled state (see FIG. 2) in which the center unit 21, the hood 22, and the cylinder 23 are disassembled. The disassembly and assembly mechanism includes specific parts that can be displaced by the operator who maintains the ventilation cylinder 10 by his / her own hands without using a tool such as a screwdriver.

The center unit 21 is provided with a sensor unit 12. The center unit 21 has a unit main body 25, a fan motor mounting portion 26, and a strut mounting portion 27. The unit body 25 is formed in a tubular shape. In FIG. 2, the unit body 25 has a cylindrical shape.

A plurality of L-shaped notches 25a are formed at the lower end of the unit main body 25. In this example, three notches 25a are provided at equal intervals along the circumferential direction of the unit body 25. In FIG. 2, only one notch 25a is shown among the three notches 25a, and the remaining two notches 25a are hidden behind the paper surface. A threaded portion of each second knob screw 42 provided on the upper portion of the tubular body 23, which will be described later, is fitted into each notch 25a.

The fan motor mounting portion 26 is provided on the upper portion of the unit main body 25. The fan motor mounting portion 26 is configured so that the fan motor 13 can be attached and detached. The fan motor mounting portion 26 is one of a plurality of parts provided in the center unit 21 that is displaced in order to enable the disassembled state and the assembled state of the ventilation cylinder 10.

As shown in FIG. 3, the fan motor mounting portion 26 includes a support portion 26a that supports the fan motor 13, an L-shaped first side plate 26b provided on the outer peripheral edge portion of the support portion 26a, and a support portion 26a. A pair of second side plates 26c provided on the outer peripheral edge portion of the above and arranged so as to sandwich the first side plate 26b, an engaging portion 26d provided on the first side plate 26b, and a pair of second side plates 26c. It has a pressing portion 26e provided on the.

The support portion 26a has a disk shape in this example. An opening 29 is formed in the center of the support portion 26a. The opening 29 of the support portion 26a is for circulating the air sucked by the fan motor 13. The fan motor 13 has a fan portion 13a arranged in the center, a flange portion 13b provided around the fan portion, and a through hole 13c formed in the flange portion 13b, and the fan portion 13a is a support portion 26a. It is placed on the opening 29 of the.

The first side plate 26b has a base end portion 30 that connects to the outer peripheral edge portion of the support portion 26a, and a tip end portion 31 that extends downward. The base end portion 30 is provided with a pin-shaped engaging portion 26d protruding upward. The engaging portion 26d engages with the through hole 13c formed in the flange portion 13b of the fan motor 13 in the assembled state of the ventilation cylinder 10. In this example, a screw hole (not shown) is formed in the base end portion 30, a screw is attached to the screw hole from below, and the screw portion of the screw protruding from the screw hole is used as the engaging portion 26d. ing. The tip portion 31 is provided with a first knob screw 33. The first knob screw 33 is loosened when the ventilation cylinder 10 is disassembled and tightened when the ventilation cylinder 10 is assembled. The first knob screw 33 does not need to be completely removed from the tip portion 31 when the ventilation cylinder 10 is disassembled.

In FIG. 3, four first side plates 26b are provided on the outer peripheral edge of the support portion 26a. The four first side plates 26b are provided at equal intervals along the circumferential direction of the support portion 26a. A pair of second side plates 26c is provided for each first side plate 26b. The engaging portion 26d is provided at a position 180 degrees away from the specific first side plate 26b and the specific first side plate 26b in the circumferential direction of the support portion 26a among the four first side plates 26b. It is provided at each base end portion 30 with the first side plate 26b. The first knob screw 33 is provided at each tip portion 31 of the four first side plates 26b.

The pressing portion 26e presses the flange portion 13b of the fan motor 13 in the assembled state of the ventilation cylinder 10. In this example, the pressing portion 26e is a spring member having hooks formed at both ends. An opening is formed in each of the pair of second side plates 26c, and each hook of the spring member is hooked on each opening. As a result, the holding portion 26e is arranged on the first side plate 26b provided between the pair of second side plates 26c. The pressing portion 26e is displaced between an urging state in which the flange portion 13b of the fan motor 13 is urged from the upper side to the lower side (see FIG. 2) and a released state in which the urging is released. The pressing portion 26e is released from the pulling force by applying a pulling force in the radial direction of the support portion 26a, and is released from the pulling force to be urged.

In FIG. 3, the pressing portion 26e is arranged so as to sandwich the remaining two first side plates 26b, which are different from the two first side plates 26b provided with the engaging portion 26d, among the four first side plates 26b. It is provided on each of the pair of second side plates 26c.

The fan motor mounting portion 26 has an engaging portion 26d and a pressing portion 26e, so that the fan motor 13 can be attached and detached. That is, the disassembly and assembly mechanism of the ventilation cylinder 10 includes a fan motor mounting portion 26 having an engaging portion 26d and a pressing portion 26e.

The column mounting portion 27 is joined to the outer peripheral surface of the unit main body 25 by welding (see FIGS. 1 and 2). The ventilation cylinder 10 is attached to the support column 15 by the support column mounting portion 27. The support column mounting portion 27 has a box shape and has a space inside.

A cable lead-in box 35 (see FIGS. 2 and 3) is attached to the side surface of the support column mounting portion 27. The cable lead-in box 35 is for pulling in various cables (not shown) from the outside of the ventilation cylinder 10. The cable drawn into the cable lead-in box 35 is, for example, a power supply cable or a control cable that is electrically connected to the sensor unit 12 and the fan motor 13. An opening (not shown) is formed in a portion of the side surface of the support column mounting portion 27 corresponding to the cable lead-in box 35, and the cable is drawn from the cable lead-in box 35 to the support column mounting portion 27 through this opening. Further, an opening (not shown) is formed in a portion of the outer peripheral surface of the unit main body 25 corresponding to the support column mounting portion 27, and a cable is drawn from the support column mounting portion 27 to the unit main body 25 through this opening.

The hood 22 is provided above the center unit 21 (see FIG. 2). The hood 22 has a cover 36 and a cap 37. In this example, the cover 36 has a cylindrical shape and the cap 37 has a conical shape. A plurality of L-shaped notches 36a are formed at the lower end of the cover 36. In this example, four notches 36a are provided at equal intervals along the circumferential direction of the cover 36. In FIG. 2, of the four notches 36a, only two notches 36a are shown, and the remaining two notches 36a are hidden behind the paper surface. The threaded portion of each of the first knob screws 33 provided in the fan motor mounting portion 26 is fitted into each notch 36a. The center unit 21 and the hood 22 are connected by fitting the threaded portion of each first knob screw 33 into each notch 36a. In the state where the center unit 21 and the hood 22 are connected, the air sucked into the ventilation cylinder 10 by the fan motor 13 from the gap formed between the unit main body 25 and the cover 36 is outside the ventilation cylinder 10. Is discharged to. The cap 37 is provided on the upper part of the cover 36. The cap 37 functions as a heat shield plate that suppresses a temperature rise inside the ventilation cylinder 10 due to direct sunlight.

The tubular body 23 is provided at the lower part of the center unit 21 (see FIG. 2). The tubular body 23 has an outer cylinder 38 connected to the center unit 21, an inner cylinder 39 housed in the outer cylinder 38, and a receiving metal fitting 40 for receiving the lower end of the inner cylinder 39.

The outer cylinder 38 has a multiple cylinder structure in which a plurality of tubular bodies are arranged concentrically. In this example, the outer cylinder 38 has a double cylinder structure composed of two cylindrical bodies, and a heat insulating material is provided between the two cylindrical bodies.

A plurality of second knob screws 42 are provided on the upper portion of the outer cylinder 38. A plurality of third knob screws 43 are provided on the lower portion of the outer cylinder 38. The second knob screw 42 and the third knob screw 43 are loosened when the ventilation cylinder 10 is disassembled and tightened when the ventilation cylinder 10 is assembled. The second knob screw 42 and the third knob screw 43 do not need to be completely removed from the outer cylinder 38 when the ventilation cylinder 10 is disassembled. In this example, the outer cylinder 38 is provided with three second knob screws 42 and three third knob screws 43. The three second knob screws 42 and the three third knob screws 43 are provided at equal intervals along the circumferential direction of the outer cylinder 38.

The outer cylinder 38 has a positioning ring 45 that positions the upper end of the inner cylinder 39. The positioning ring 45 is provided on the upper side inside the outer cylinder 38. The positioning ring 45 is one of a plurality of parts provided in the cylinder body 23 that is displaced in order to enable the disassembled state and the assembled state of the ventilation cylinder 10.

As shown in FIG. 4, the positioning ring 45 has a tubular ring main body 46 and a positioning portion 47 provided on the ring main body 46. The ring body 46 has a cylindrical shape in this example. The inner diameter of the ring body 46 is equal to or greater than the outer diameter of the upper end of the inner cylinder 39, which will be described later, and is less than the outer diameter of the lower end of the inner cylinder 39. Since the inner diameter of the ring body 46 is equal to or larger than the outer diameter of the upper end of the inner cylinder 39, the upper end of the inner cylinder 39 can be inserted into the ring body 46. Since the inner diameter of the ring body 46 is less than the outer diameter of the lower end of the inner cylinder 39, the lower end of the inner cylinder 39 cannot be inserted into the ring body 46.

A plurality of beam portions 49 for fixing the positioning ring 45 to the outer cylinder 38 are provided on the outer peripheral edge portion of the ring main body 46. In this example, three beam portions 49 are provided on the outer peripheral edge portion of the ring main body 46. The three beam portions 49 are provided at equal intervals along the circumferential direction of the ring main body 46. The three beam portions 49 are fixed to the outer cylinder 38 using, for example, screws.

The positioning unit 47 positions the upper end of the inner cylinder 39. The positioning portion 47 is elastically deformed, that is, displaced in the radial direction of the ring body 46. The positioning portion 47 is formed by a plurality of comb teeth 48 that protrude in the axial direction of the ring body 46 and are inclined toward the inside of the ring body 46. The plurality of comb teeth 48 are arranged at equal intervals along the circumferential direction of the ring body 46. In this example, the positioning portion 47 is formed by 24 comb teeth 48.

The diameter of the virtual circle S1 formed when the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring body 46 is equal to or less than the outer diameter of the upper end of the inner cylinder 39. As a result, when the inner cylinder 39 inserted into the ring body 46 is further moved upward, the plurality of comb teeth 48 come into contact with the upper ends of the inner cylinder 39. The plurality of comb teeth 48 are displaced by coming into contact with the upper end of the inner cylinder 39. The upper end of the inner cylinder 39 is positioned by the displacement of the plurality of comb teeth 48.

When the diameter of the virtual circle S1 is smaller than the outer diameter of the upper end of the inner cylinder 39, the plurality of comb teeth 48 are pushed by the upper end of the inner cylinder 39 inserted into the ring body 46, and the diameter of the ring body 46 is reached. Elastically deforms (displaces) outward in the direction. The elastically deformed plurality of comb teeth 48 urge the upper end of the inner cylinder 39 inward in the radial direction of the ring body 46.

By having the positioning portion 47, the positioning ring 45 can position the upper end of the inner cylinder 39. That is, the disassembly and assembly mechanism of the ventilation cylinder 10 includes a positioning ring 45 having a positioning portion 47.

The inner cylinder 39 has a sensor accommodating portion 51 accommodating the sensor unit 12 and an air suction unit 52 into which air is sucked (see FIG. 2). In the inner cylinder 39, the sensor accommodating portion 51 is on the upper side and the air suction portion 52 is on the lower side inside the outer cylinder 38. In this example, the sensor accommodating portion 51 has a cylindrical shape, and the air suction portion 52 has a substantially truncated cone shape. In FIG. 2, the lower end of the sensor accommodating portion 51 and the upper end of the air suction portion 52 are connected by a cylindrical connecting pipe. The outer diameter of the upper end of the sensor accommodating portion 51 is smaller than the outer diameter of the lower end of the air suction portion 52. The outer diameter of the upper end of the sensor accommodating portion 51 is the outer diameter of the upper end of the inner cylinder 39. The outer diameter of the lower end of the air suction portion 52 is the outer diameter of the lower end of the inner cylinder 39. The inner diameter of the lower end of the air suction portion 52 is the inner diameter of the lower end of the inner cylinder 39.

The receiving metal fitting 40 is attached to the lower part of the outer cylinder 38 and receives the lower end of the inner cylinder 39. The receiving metal fitting 40 is configured to position the lower end of the inner cylinder 39. The receiving metal fitting 40 is one of the plurality of parts provided in the cylinder body 23 that is displaced in order to enable the disassembled state and the assembled state of the ventilation cylinder 10.

As shown in FIG. 5, the receiving metal fitting 40 has a plate 53 and a plurality of L-shaped arms 54 provided on the outer peripheral edge of the plate 53.

The plate 53 is disk-shaped in this example. A screw hole 55 is formed in the center of the plate 53. Although not shown, the screw hole 55 can be provided with an inflow amount adjusting plate for adjusting the flow rate of the air flowing into the air suction unit 52. The inflow amount adjusting plate has a larger diameter than the plate 53. A light-shielding member that blocks sunlight reflected on the ground may be attached to the screw hole 55. The inflow amount adjusting plate and the light-shielding member are attached to the screw holes 55 using screws.

The plurality of arms 54 are a plurality of plates extending radially from the center of the plate 53. In FIG. 5, three arms 54 are provided on the outer peripheral edge of the plate 53. The three arms 54 are provided at equal intervals along the circumferential direction of the plate 53. Air flows through the gaps formed between the plate 53 and the plurality of arms 54.

Each arm 54 has a base 54a that connects to the plate 53 and an upwardly extending tip 54b. Each base 54a is provided with a positioning piece 56 that positions the lower end of the inner cylinder 39. In this example, a pair of positioning pieces 56 are provided on both side surfaces of each base portion 54a.

Each positioning piece 56 has a value in which the diameter of the virtual circle S2 formed when the radially outer ends of the plate 53 are connected in the circumferential direction of the plate 53 is slightly smaller than the inner diameter of the lower end of the inner cylinder 39. It is arranged in such a position as. As a result, the plurality of positioning pieces 56 are arranged inside the lower end of the inner cylinder 39 in the assembled state of the ventilation cylinder 10, and restrict the movement of the lower end of the inner cylinder 39.

Each tip 54b is formed with a notch 57 recessed in the circumferential direction of the plate 53. Each notch 57 is fitted with a threaded portion of each third knob screw 43 provided at the bottom of the tubular body 23.

The receiving metal fitting 40 is displaced along the notch 57 when the ventilation cylinder 10 is in the disassembled state or the assembled state. Specifically, when the ventilation tube 10 is in the disassembled state, the receiving metal fitting 40 is rotated along the notch 57 and then moved downward. When the ventilation cylinder 10 is in the assembled state, the receiving metal fitting 40 is moved upward along the notch 57 and then rotated. The receiving metal fitting 40 positions the lower end of the inner cylinder 39 by having the positioning piece 56. That is, the disassembly and assembly mechanism of the ventilation cylinder 10 includes a receiving metal fitting 40 having a positioning piece 56.

The procedure for disassembling the ventilation tube 10 and the procedure for disassembling the ventilation tube 10 will be described. First, as a procedure for disassembling the ventilation cylinder 10, a case where the hood 22 is removed from the center unit 21 and then the cylinder 23 is removed from the center unit 21 will be described as an example.

In the assembled state (see FIG. 1) in which the center unit 21, the hood 22, and the cylinder 23 are assembled, the ventilation cylinder 10 has the first knob screw 33, the second knob screw 42, and the third knob screw 43. It is said to be in a tightened state.

First, all the first knob screws 33 are loosened in order to remove the hood 22 from the center unit 21. Each of the first knob screws 33 does not have to be completely removed from the fan motor mounting portion 26, but only needs to be loosened. With each of the first knob screws 33 loosened, the hood 22 is rotated and then moved upward along the L-shaped notch 36a formed in the cover 36 of the hood 22, so that each notch 36a And each of the first knob screws 33 are released from the fitting. As a result, the hood 22 is removed from the center unit 21.

Next, all the second knob screws 42 are loosened in order to remove the tubular body 23 from the center unit 21. Each second knob screw 42 does not have to be completely removed from the outer cylinder 38, but only needs to be loosened. With each of the second knob screws 42 loosened, each notch is formed by rotating the tubular body 23 and then moving it downward along the L-shaped notch 25a formed at the lower end of the unit body 25. The mating between the 25a and each of the second knob screws 42 is released. As a result, the tubular body 23 is removed from the center unit 21.

A procedure for disassembling the cylinder body 23 removed from the center unit 21 into an outer cylinder 38, an inner cylinder 39, and a receiving metal fitting 40 will be described. First, loosen all the third knob screws 43. Each third knob screw 43 need only be loosened without being completely removed from the outer cylinder 38. With each third knob screw 43 loosened, the receiving metal fitting 40 is rotated along the notch 57 and then moved downward to bring the notch 57 and each third knob 43 together. Release the mating. As a result, the receiving metal fitting 40 is removed from the outer cylinder 38.

Next, the inner cylinder 39 is taken out from the inside of the outer cylinder 38. When the diameter of the virtual circle S1 formed when the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring body 46 is less than the outer diameter of the upper end of the inner cylinder 39, the upper end of the inner cylinder 39 is set. Since it is urged by the positioning portion 47, even if the receiving metal fitting 40 is removed from the outer cylinder 38, the state in which the inner cylinder 39 is housed inside the outer cylinder 38 is maintained. As described above, the positioning ring 45 has a function of positioning the upper end of the inner cylinder 39 and a function of preventing the inner cylinder 39 from falling off. The inner cylinder 39 can be easily removed by pulling out from the outer cylinder 38.

If the diameter of the virtual circle S1 formed when the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring body 46 is equal to the outer diameter of the upper end of the inner cylinder 39, the upper end of the inner cylinder 39 is formed. Is not urged by the positioning portion 47, so that the inner cylinder 39 housed inside the outer cylinder 38 can be easily removed only by removing the receiving metal fitting 40 from the outer cylinder 38.

The procedure for removing the fan motor 13 from the fan motor mounting portion 26 will be described. When the hood 22 is removed from the center unit 21, the pressing portion 26e is in an urging state, and the fan motor 13 is urged from the upper side to the lower side. Therefore, first, the holding portion 26e is released. In this example, since the pressing portion 26e is a spring member, the pressing portion 26e can be easily released by pulling the support portion 26a in the radial direction. The fan motor 13 is moved upward while the pressing portion 26e is in the released state. As a result, the through hole 13c formed in the flange portion 13b of the fan motor 13 and the engaging portion 26d of the fan motor mounting portion 26 are disengaged, and the fan motor 13 can be removed from the fan motor mounting portion 26. it can.

Next, the procedure for assembling the ventilation cylinder 10 will be described. The procedure for putting the ventilation cylinder 10 in the assembled state is the reverse of the procedure for putting the ventilation cylinder 10 in the disassembled state.

A procedure for assembling the tubular body 23 from the outer cylinder 38, the inner cylinder 39, and the receiving metal fitting 40 will be described with reference to FIGS. 6 to 8. First, as shown in FIG. 6, the inner cylinder 39 is arranged below the outer cylinder 38 and inserted into the outer cylinder 38 from the upper end of the inner cylinder 39.

As shown in FIG. 7, the inner cylinder 39 is inserted into the outer cylinder 38 until the position of the lower end of the inner cylinder 39 and the position of the lower end of the outer cylinder 38 match. The positioning ring 45 is formed when the inner diameter of the ring main body 46 is equal to or larger than the outer diameter of the upper end of the inner cylinder 39 and the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring main body 46. Since the diameter of the circle S1 (see FIG. 4) is equal to or less than the outer diameter of the upper end of the inner cylinder 39, the upper end of the inner cylinder 39 is passed. The plurality of comb teeth 48 restrict the movement of the upper end of the inner cylinder 39 by coming into contact with the upper end of the inner cylinder 39. In this way, the positioning ring 45 positions the upper end of the inner cylinder 39.

Since the inner diameter of the ring body 46 is smaller than the outer diameter of the lower end of the inner cylinder 39, the lower end of the inner cylinder 39 cannot pass through the ring body 46. As described above, the positioning ring 45 has a function of preventing erroneous insertion of the lower end of the inner cylinder 39.

As shown in FIG. 8, the receiving metal fitting 40 is arranged below the outer cylinder 38 so that each positioning piece 56 of the receiving metal fitting 40 is arranged inside the lower end of the inner cylinder 39.

As shown in FIG. 9, the receiving metal fitting 40 is moved upward along the notch 57 and then rotated to fit each notch 57 and each third knob screw 43. Each third knob screw 43 is tightened in a state where each notch portion 57 and each third knob screw 43 are fitted. As a result, the outer cylinder 38 and the receiving metal fitting 40 are connected. Each positioning piece 56 of the receiving metal fitting 40 has an inner cylinder 39 having a diameter of a virtual circle S2 (see FIG. 5) formed when the radially outer ends of the plate 53 are connected in the circumferential direction of the plate 53. Since it is provided at a position where the value is slightly smaller than the inner diameter of the lower end, the movement of the lower end of the inner cylinder 39 housed in the outer cylinder 38 is restricted. In this way, the positioning ring 45 positions the lower end of the inner cylinder 39 by the receiving metal fitting 40.

Next, the assembled tubular body 23 is arranged below the center unit 21, and the tubular body 23 is moved upward along the L-shaped notch 25a formed at the lower end of the unit main body 25 and then rotated. 25a of each notch and the second knob screw 42 are fitted to each other. The center unit 21 and the tubular body 23 are connected by tightening each of the second knob screws 42 in a state where each notch 25a and each of the second knob screws 42 are fitted.

The procedure for attaching the fan motor 13 to the fan motor mounting portion 26 will be described with reference to FIGS. 10 and 11. First, as shown in FIG. 10, the fan motor 13 is attached to the fan motor mounting portion 26 so that the through hole 13c formed in the flange portion 13b of the fan motor 13 and the engaging portion 26d of the fan motor mounting portion 26 correspond to each other. Place above. The pressing portion 26e (not shown) is put into a released state by applying a pulling force in the radial direction of the supporting portion 26a.

As shown in FIG. 11, the fan motor 13 is moved downward, and the engaging portion 26d of the fan motor mounting portion 26 is inserted into the through hole 13c of the fan motor 13. The pressing portion 26e (not shown) is placed on the flange portion 13b of the fan motor 13 by being released from the pulling force, and is put into an urging state (see FIG. 2). The flange portion 13b of the fan motor 13 is urged from the upper side to the lower side by the pressing portion 26e in the urged state, and the fan motor 13 is prevented from rising. As described above, the fan motor mounting portion 26 has the engaging portion 26d engaged with the through hole 13c of the fan motor 13 and the pressing portion 26e that is displaced between the disengaged state and the urging state. The motor 13 is removable.

The procedure for attaching the hood 22 to the center unit 21 will be described. By arranging the hood 22 above the center unit 21 and moving the hood 22 downward along the L-shaped notch 36a formed in the cover 36 of the hood 22, the hood 22 is rotated to form each notch 36a. Each first knob screw 33 is fitted. The center unit 21 and the hood 22 are connected by tightening each of the first knob screws 33 in a state where each notch 36a and each of the first knob screws 33 are fitted.

As described above, the ventilation cylinder 10 is in a disassembled state and an assembled state by displaces at least one of a plurality of parts provided in the center unit 21, the hood 22, and the cylinder 23 without using a tool. It is easy to maintain because it is configured to enable.

Since the ventilation cylinder 10 includes the positioning ring 45 as the disassembly and assembly mechanism, the upper end of the inner cylinder 39 can be easily positioned.

Since the ventilation cylinder 10 includes the receiving metal fitting 40 as the disassembly and assembly mechanism, the lower end of the inner cylinder 39 can be easily positioned.

Since the ventilation cylinder 10 includes the fan motor mounting portion 26 as the disassembly and assembly mechanism, the fan motor 13 can be easily attached and detached.

The positioning ring 45 has a ring body 46. When the inner diameter of the ring body 46 is equal to or greater than the outer diameter of the upper end of the inner cylinder 39 and less than the outer diameter of the lower end of the inner cylinder 39, the upper end of the inner cylinder 39 can be inserted and the lower end of the inner cylinder 39 is inserted. It is said to be impossible. Therefore, in the ventilation cylinder 10, the ring body 46 of the positioning ring 45 prevents the inner cylinder 39 from being erroneously inserted.

The positioning ring 45 has a positioning portion 47 formed by a plurality of comb teeth 48 that protrude in the axial direction of the ring main body 46 and are inclined toward the inside of the ring main body 46. The virtual circle S1 formed when the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring body 46 is inserted into the ring body 46 because the diameter of the virtual circle S1 is equal to or less than the outer diameter of the upper end of the inner cylinder 39. The upper end of the inner cylinder 39 comes into contact with the plurality of comb teeth 48, and the upper end of the inner cylinder 39 is positioned.

Since the diameter of the virtual circle S1 formed when the tips of the plurality of comb teeth 48 are connected in the circumferential direction of the ring body 46 is less than the outer diameter of the upper end of the inner cylinder 39, it is inserted into the ring body 46. The upper end of the inner cylinder 39 is urged by a plurality of comb teeth 48 to prevent the inner cylinder 39 from falling off from the outer cylinder 38 when the ventilation cylinder 10 is disassembled.

The ventilation cylinder 10 is configured so that it can be disassembled and assembled by simply loosening the first knob screw 33, the second knob screw 42, and the third knob screw 43 without removing them. The knob screw 33, the second knob screw 42, and the third knob screw 43 are prevented from falling off. In the conventional ventilation cylinder, since it is necessary to remove the screw member at the time of maintenance, the screw member may be dropped and lost, which causes a problem in maintainability. In the ventilation cylinder 10, the first knob screw 33, the second knob screw 42, and the third knob screw 43 are prevented from falling off, so that the ventilation cylinder 10 is excellent in maintainability.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention.

The shapes of the center unit 21, the hood 22, and the tubular body 23 are not limited to the shapes of the above-described embodiment. The unit body 25 is not limited to a cylindrical shape, and may have an elliptical cylinder shape, a square cylinder shape, or the like. The cover 36 is not limited to a cylindrical shape, and may have an elliptical cylinder shape, a square cylinder shape, or the like. The cap 37 is not limited to a conical shape, and may have an elliptical frustum shape, a pyramid frustum shape, or the like. The outer cylinder 38 is not limited to the case where it is composed of a cylindrical body, and may be composed of an elliptical tubular body, a square tubular body, or the like.

The ring body 46 is not limited to a cylindrical shape, and may be an elliptical cylinder shape, a square cylinder shape, or the like. When the ring body 46 has an elliptical cylinder shape or a square cylinder shape, the diameter of the inscribed circle of the ring body 46 is defined as the inner diameter of the ring body 46.

The sensor accommodating portion 51 is not limited to a cylindrical shape, but may have an elliptical cylinder shape, a square cylinder shape, or the like. When the sensor accommodating portion 51 has an elliptical cylinder shape or a square tubular shape, the diameter of the circumscribed circle of the sensor accommodating portion 51 is set to the outer diameter of the upper end of the sensor accommodating portion 51, that is, the outer diameter of the upper end of the inner cylinder 39.

The air suction unit 52 is not limited to the truncated cone shape, and may be an elliptical truncated cone shape, a square truncated cone shape, or the like. When the air suction portion 52 has an elliptical frustum shape or a square frustum shape, the diameter of the circumscribed circle at the lower end of the air suction portion 52 is the outer diameter of the lower end of the air suction portion 52, that is, the outer diameter of the lower end of the inner cylinder 39. To do. Further, the diameter of the inscribed circle at the lower end of the air suction portion 52 is defined as the inner diameter of the lower end of the air suction portion 52, that is, the inner diameter of the lower end of the inner cylinder 39.

10 Ventilation cylinder 12 Sensor part 13 Fan motor 21 Center unit 22 Hood 23 Cylinder body 26 Fan motor mounting part 26d Engagement part 26e Presser part 38 Outer cylinder 39 Inner cylinder 40 Receiving metal fittings 45 Positioning ring 46 Ring body 47 Positioning part 48 Multiple Comb tooth 56 Positioning piece

Claims (9)

A center unit equipped with a sensor that measures at least one of the temperature and humidity of the atmosphere,
The hood provided on the upper part of the center unit and
A cylinder provided at the bottom of the center unit and
The center unit, the hood, and the cylinder are assembled by displacement of at least one of the plurality of parts provided in the center unit, the hood, and the cylinder without using a tool. A ventilation cylinder including an assembled state and an disassembled and assembled mechanism that enables the disassembled state of the center unit, the hood, and the cylinder. The cylinder body has an outer cylinder connected to the center unit and an inner cylinder housed in the outer cylinder.
The ventilation cylinder according to claim 1, wherein the outer cylinder has a positioning ring for positioning the upper end of the inner cylinder as a part to be displaced among the plurality of parts. The ventilation cylinder according to claim 2, wherein the positioning ring has a ring body having an inner diameter equal to or larger than the outer diameter of the upper end of the inner cylinder and less than the outer diameter of the lower end of the inner cylinder. The ventilation cylinder according to claim 3, wherein the positioning ring has a positioning portion formed by a plurality of comb teeth that protrude in the axial direction of the ring body and are inclined toward the inside of the ring body. The ventilation cylinder according to claim 4, wherein the plurality of comb teeth urge the upper end of the inner cylinder. The ventilation cylinder according to any one of claims 2 to 5, wherein the cylinder body has a receiving metal fitting for positioning the lower end of the inner cylinder as a part to be displaced among the plurality of parts. The ventilation cylinder according to claim 6, wherein the receiving metal fitting is arranged inside the lower end of the inner cylinder and has a plurality of positioning pieces for restricting the movement of the lower end of the inner cylinder. The ventilation cylinder according to any one of claims 1 to 7, wherein the center unit has a fan motor mounting portion configured to be detachable as a part to be displaced among the plurality of parts. The fan motor has a fan portion arranged in the center, a flange portion provided around the fan portion, and a through hole formed in the flange portion.
The ventilation cylinder according to claim 8, wherein the fan motor mounting portion has an engaging portion that engages with the through hole and a holding portion that presses the flange portion.

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