JP2002017127A - Centrifugal fan for fertilizing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal fan for a fertilizing unit, having a casing of which the stiffness is increased so that noise insulation and absorption effects are enhanced, and further having such an engaging structure on joining surfaces of the casing as to be improved in airtightness, while the casing is formed to have a divided structure. SOLUTION: In this centrifugal fan for the fertilizing unit, the casing 51 for containing an impeller 52 is constructed to have a structure divisible into two parts, and each of the divided parts of the casing 51 is formed to have a double wall structure. An engaging convex ridge 66 and an engaging concave groove 67 mutually fittable and engaged are each arranged on the joining surfaces of the divided parts of the casing 52, and further the engaging convex ridge 66 is formed to have a hollow space in its inside so that the airtightness is improved when engaged with the engaging concave groove 67.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan for a fertilizer that wind-feeds a granular fertilizer delivered from a hopper to a fertilizer application site.

[0002]

2. Description of the Related Art For example, Japanese Patent Application No. 11-80 discloses a casing for accommodating an impeller in the centrifugal fan.
No. 082, as shown as an example of an embodiment by the present applicant, the casing is divided into two in the direction of the rotation axis of the impeller, and a pair of divided casings are joined and configured. Each divided casing is formed using a resin molding method such as injection.

[0003]

In the above construction, since the injection molding method is used, the manufacturing method is complicated and costly, and the wall of the split casing itself is single. In addition, there was a surface inferior in rigidity and the like.

The present invention has been made in view of such a point, and adopts a structure capable of increasing the rigidity of the divided casings, and has adopted a joint structure at the joint surface between the divided casings for airtightness. An object of the present invention is to provide a centrifugal fan of a fertilizer that can be set in a high state.

[0005]

Means for Solving the Problems [Structure, operation and effect of the invention according to claim 1] (Structure) The characteristic structure of the invention according to claim 1 is that a fertilizer in the form of powder and granules fed out of a hopper is applied to a fertilizer. A centrifugal fan for a fertilizer that transports wind to a pair of splitters, wherein an impeller that generates wind for transport is housed in a casing, and the casing is divided into two in the direction of the rotation axis of the impeller. In order to form the casing by joining, on the joining surface of the pair of split casings, forming an engaging ridge having an internal space in a hollow state and an engaging groove engaging with the engaging ridge, A wall portion of each of the divided casings is formed in a double wall structure having a space formed therein, and the divided casing and at least one of the engaging ridge or the engaging concave groove are integrally formed by resin blow molding. Formed There is a point, the action effect is as follows.

(Operation) According to the above configuration, by adopting blow molding, a simple method can be adopted as a casing molding method. Since each divided casing is formed in a double wall structure, rigidity as a casing is obtained. As a result, resonance becomes difficult and the wall itself has a high soundproofing and sound absorbing effect. In addition, since the engaging ridge formed on the joint surface of the two casings has a hollow internal space, when the engaging ridge engages with the engaging groove, the internal space is free. Utilizing the deformability, the adhesion to the engaging groove is improved.

(Effects) Therefore, even if the casing is divided into two parts and the two divided casings are assembled and assembled after the production, the double-walled structure can be applied to the engaging ridge. By applying this, it is possible to enhance the sealing performance while providing a soundproof and sound absorbing effect as a casing, and to provide a highly functional centrifugal blower even with a simple molding method.

[Structure, operation and effect of the invention according to claim 2] (Structure) The fertilizer applicator according to the invention according to claim 2 is a fertilizer that wind-conveys powdery and granular fertilizer fed from a hopper to a fertilization site. A centrifugal fan for a device, wherein an impeller for generating wind for conveyance is accommodated in a casing, and the casing is divided into a pair of divided casings in a rotation axis direction of the impeller. Is formed into a double-walled structure in which a hollow portion is formed in a hollow state, and the divided casings are connected to each other via a connecting piece that is connected in an adjacent state, and the pair of divided casings can be assembled together by bending at the connecting piece portion. Formed on the mating surfaces of the hollow double walls of the pair of split casings, an engaging ridge and an engaging concave groove that engage with each other are formed, and the engaging ridge is formed on the one side. An outer wall of the split casing is formed so as to protrude outward in a hollow state, and the engaging groove is provided by indenting an outer wall of the other split casing inward; , The engaging ridges, the engaging concave grooves, and the connecting pieces are integrally formed by blow molding of resin, and the operation and effect are as follows.

(Function and Effect) As in the first aspect of the present invention, the casing is formed in a double-walled structure.
It is expected that the rigidity of the casing will be improved and the airtightness will be improved by the use of the engaging ridges forming a hollow space inside. Moreover, since the two-part casing can be integrally molded by blow molding through the connecting pieces while maintaining the double-walled structure of the two divided casings, the apparatus and molding method are not as complicated as those of the injection molding method. The required time can be shortened, and the production cost can be reduced.

[Structure, operation and effect of the invention according to claim 3] (Structure) The fertilizer application device according to the invention according to claim 3 is a fertilizer that wind-transports the granular fertilizer fed from the hopper to a fertilization site. A centrifugal fan for a device, wherein an impeller for generating wind for conveyance is accommodated in a casing, and the casing is divided into a pair of divided casings in a rotation axis direction of the impeller. Is formed into a double-walled structure in which a hollow portion is formed in a hollow state, and the divided casings are connected to each other via a connecting piece that is connected in an adjacent state, and the pair of divided casings can be assembled together by bending at the connecting piece portion. And forming two fold lines at the time of assembling the pair of split casings with the connecting piece, and forming a hollow line in the pair of split casings. On the mating surface of the walls, an engaging ridge and an engaging concave groove that engage with each other are formed, and the engaging ridge is formed by projecting the outer wall of the one divided casing outward in a hollow state, and The engaging groove is provided by indenting an outer wall of the other divided casing inward, and the divided casing having the double wall structure, the engaging ridge, the engaging groove, and the connection piece are provided. Is integrally formed by resin blow molding, and the operation and effect are as follows.

(Function and Effect) The same function and effect as the invention according to claim 2 can be obtained, and since two bending lines are provided on the connecting piece connecting the two split casings, there is a difference in a state before bending. The engaging ridge and the engaging groove, whose axes are parallel to each other, are separated by the two bending lines by 90.
By bending each time, it is easy to make the axes coincide with each other while facing each other, and the engagement operation can be easily performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a riding type rice transplanter with a six-row planting specification equipped with a fertilizer application device according to the present invention. This rice transplanter has a lifting link 2
It has a basic structure in which a six-row seedling planting device 3 is connected to be able to ascend and descend freely via a fertilizer application device 4 at the rear of the traveling machine body 1.

An engine 5 is mounted on a front portion of the traveling body 1, and its output is shifted by a hydrostatic continuously variable transmission (HST) 6 capable of switching between forward and backward movements. 7 is input. The power input to the front transmission case 7 is split into a traveling system and a planting system after a gear shift, and a part of the power of the traveling system is transmitted to the left and right steering front wheels 8 mounted on the front transmission case 7. At the same time, another part of the power of the traveling system is transmitted to the rear transmission case 10 via the main shaft 9 at the lower abdomen of the fuselage, and transmitted to the left and right rear wheels 11 supported by the rear transmission case 10. Also, the planting system power taken out by the front transmission case 7 is transmitted to the seedling planting device 3 via the working power take-out shaft 12 at the lower abdomen of the machine body and the transmission shaft 13 connected to the rear end. Has become.

The seedling planting apparatus 3 includes a feed case 14 receiving power from the transmission shaft 13, a seedling stand 15 for placing and storing six rows of seedlings, and reciprocally moving left and right with a constant stroke.
Three planting cases 16 arranged side by side in a rearward cantilever manner at the rear of the feed case 14, and each planting case 1
6, a rotary planting mechanism 17 for six rows mounted on the left and right of the rear end portion, and three leveling floats 18 for leveling and leveling the planned planting area on the rice field.
The plant is configured so that six rows of seedlings cut out from the lower end of 5 by each of the rotary planting mechanisms 17 are planted on the rice field leveled by each leveling float 18.

As shown in FIGS. 1 and 2, the fertilizer applicator 4 includes a hopper 21 fixedly provided behind a driver's seat 19, and a feeding mechanism for feeding a predetermined amount of powdery and granular fertilizer stored in the hopper 21. 22, six transport hoses 24 for wind-transporting the fed fertilizer to a groove generator 23 provided one by one on each leveling float 18, and the transport hoses 24
A blower 25 utilizing a centrifugal fan for feeding the carrier air to the group,
And so on.

As shown in FIG. 3 to FIG.
Are three roll members 26a, 26 having different widths in the axial direction.
6b and 26c are arranged in a two-row unit that is incorporated in parallel into one feeding case 27, and four feeding mechanisms 22 are connected to the lower end of the hopper 21. I have. In this example of the six-row planting specification, two-row feeding is performed by the feeding mechanisms 22 on the left and right sides, and the two feeding mechanisms 2 on the center side are used.
In No. 2, the supply of fertilizer to one of the parallel feeding rolls 26 is shut off by the detachable cover 28, so that only one feed is fed. Each of the roll members 26a,
Shutter plate 29 corresponding to each of 26b and 26c
The manipulating amount of fertilizer per rotation of each feeding roll 26 can be adjusted by pushing and pulling the operating rod 29a to open and close the shutter plates 29 appropriately.

As shown in FIG. 5, two sets of feeding rolls 26 in each feeding mechanism 22 are rotatably supported at the lower portion of a feeding case 27 via a horizontal rotation support shaft 30, and are provided at the lower end of the case. Is the outlet pipe 3 that penetrates back and forth
1 are provided in a pair on the left and right corresponding to the respective feeding rolls 26. The transfer hose 2 is connected to the rear end of the outlet pipe 31.
4 is connected, and the front end of the outlet pipe 31 is inserted and connected to the blower pipe 31 that receives the air from the blower 25, and is fed by the feed roll 26 and supplied to the outlet pipe 31. Is supplied to the conveying hose 24 by the conveying air introduced from the blower tube 32 and supplied to the groove forming device 23, and is buried near the lateral side of the seedling of each of the streaks. In the two feeding mechanisms 22 on the center side, the feeding rolls 26 that are stopped for feeding are used.
The rear end of the outlet pipe 31 corresponding to (1) is closed by the cap 33 to prevent the outflow of the conveying air.

The feeding case 27 includes an upper case 27a which is internally connected to a lower end of the hopper 21, and an outlet pipe 31.
And a lower case 27b having an upper case 27a and a lower case 2
7b, the axis of the feed roll 26 is positioned on the joint surface, and the outlet pipe 31 is pulled out of the blower pipe 32 to separate the lower case 27b from the upper case 27a.
The feeding roll 26 can be removed downward. The blower tube 32 has a hard tube portion 32a and a flexible rubber tube portion 32b to which the front end of the outlet tube 31 is inserted and connected.
Are sequentially inserted and connected.
By deforming b, the outlet pipe 31 can be easily separated.

Here, the upper half of the upper case 27a is formed in a downward tapered shape in a front view so as to guide the fertilizer flowing down from the lower end opening of the hopper 21 to the left and right feeding rolls 26. A plurality of partition walls 34 for guiding the fertilizer are provided to the roll members 26a, 26b, 26c constituting each of the feeding rolls 26, and the shutter plate 29 is assembled between the partition walls 34,
The guide rod 35 is bent and guided by the guide rod 35 laid horizontally.

The lower half of the upper case 27a is provided with the upper half portion of the feeding roll 26, and the brush 3 for sliding in contact with the outer periphery of the feeding roll 26 is provided.
6 is removably fitted and mounted. Further, a pair of left and right residual fertilizer discharge ports 37 are formed on the lower front side of the upper case 27a, and are normally closed by a swing shutter 38 as shown in the figure. , The fertilizer remaining in the hopper 21 can be discharged downward through the discharge hose 39.

In the upper part of the lower case 27b, a funnel R is formed, which is downwardly tapered so as to guide the fed fertilizer to an intermediate portion of the outlet pipe 31, and the lower half of the feeding roll 26 is formed in the funnel R. It is arranged to enter. The intermediate portion of the outlet pipe 31 is formed in a narrowed shape, and
By increasing the wind speed of the transport wind introduced from step 2, the fertilizer is smoothly delivered on the transport wind.

A draining rib 41 protrudes from the outer peripheral surface of the hopper 21 to prevent rainwater adhering to the outer surface of the hopper from flowing to the feeding mechanism 22 and to discharge the residual fertilizer. An eave portion 42 is projected from an outer surface of the upper case 27 a located above the outlet 37, and even if rainwater flows down along the outer surface of the case 27, the eave portion 42 is formed.
, And is prevented from flowing to the residual fertilizer discharge port 37.

As shown in FIG. 1, FIG. 3 and FIG. 5, a common feeding drive shaft 43 is suspended across the four feeding mechanisms 22 arranged in parallel, and this feeding drive shaft 43 and the lower abdomen of the machine body. Is linked to the main shaft 9 arranged at the same time, and the feeding mechanism 22 is driven at a speed synchronized with the traveling speed. That is, a part of the rotational power of the main shaft 9 is supplied to the crank arm 45 through the fertilizer drive case 44.
The crank arm 45 and the drive arm 46 extended from the feed drive shaft 43 are interlocked and connected by a push / pull rod 47, and the feed drive shaft 43 reciprocates by the rotation of the crank arm 45. It is supposed to be. Then, the feeding drive shaft 43 and the rotation support shaft 30 are interlocked and connected via a two-way one-way clutch and a one-way transmission mechanism using a reverse transmission link,
The rotary support shaft 30 is pulsatively pitch-rotated in a predetermined feeding direction (counterclockwise in FIG. 4) in accordance with each of the forward and backward movements of the feeding drive shaft 43. In this way, by performing the fertilizer application with the power from the traveling system, it is possible to maintain a constant fertilization amount per unit traveling distance, that is, a fertilization amount per unit area regardless of the traveling speed. It is. The amount of fertilization per unit area can be adjusted by changing the connecting position between the drive arm 46 and the push / pull rod 47 and adjusting the reciprocating swing angle of the drive arm 46.

The fertilizer applicator 4 having the above-described structure is supported by a horizontally-long fixed frame 48 which extends horizontally above the rear of the fuselage.
An operation handle 49 for manually rotating the feeding drive shaft 43 composed of a hexagonal shaft is housed and mounted at an end of the fixed frame 48 on the right side of the machine body.

The blower 25 is connected to the left end of the blower tube 31. As shown in FIGS. 7 to 11, an impeller 52 provided inside a spiral fan casing 51 has an electric motor 53 mounted on the fan casing 51. Driven by the suction port 5 provided at the center of the fan casing 51.
4 is pumped from the discharge port 55 opened in the tangential direction, and the air is fed out from each of the delivery mechanisms 22 through the blower tube 32.
Is supplied to the outlet pipe 31.

As shown in FIGS. 7 and 8, the casing 51 is formed by joining a front divided casing 51A on which an electric motor 53 is mounted and a rear divided casing 51B provided with an intake port 54. It is composed of a resin molded product with a front and rear split structure connected by bolts. And FIG.
As shown in FIG. 5, an intake duct 56 connected to the intake port 54 is integrally provided on the rear surface of the casing 51, and an outside air intake port 56a of the intake duct 56 is opened upward.
Further, an intake cover 57 that entirely covers the intake duct 56
Is attached to the rear surface of the casing 51. The outside air intake 57a of the intake cover 57 is opened downward so that intake noise and fan driving are hardly transmitted to the driver sitting on the driver's seat 19.

The electric motor 53 is connected to the front split casing 51A via a mounting flange 53a, and the impeller 52 is inserted and connected to a motor shaft 53b formed in an oval cross section and tightened and fixed by a nut 58. Have been. The electric motor 53 itself is protected by a resin-made motor cover 59 connected to the mounting seat 70 on the front surface of the front casing portion 51a.

As shown in FIGS. 9 to 11, the motor cover 59 is formed by connecting a mounting flange 59b to an opening of a cylindrical cover body 59a. An electric wire insertion opening 71 is formed in a notch over the main body 59a, and an electric wire 72 connected to the electric motor 53 is inserted through the cutout.

At the center of the mounting flange 59b, a sealing ridge 73 having a tapered cross section as shown in FIGS. In the mounting seat 70 of the front casing portion 51A, a sealing groove 74 having a narrowed cross section for engaging the sealing ridge 73 is formed in a partially arcuate shape, and the sealing ridge 73 and the sealing groove 74 are formed. Are tightly engaged with each other to seal at the joint between the motor cover 59 and the casing 51.

Further, on the outer peripheral portion of the mounting flange 59b, an outer peripheral ridge 75 externally fitted to the mounting seat 70 of the front casing portion 51A is provided in a partially arcuate shape divided by the electric wire insertion port 71, and the motor cover 59 Dust and water are prevented from entering the joint portion with the casing 51.

As shown in FIGS. 9 to 13, the impeller 52
Is a cantilever heading a boss 62, a group of main blades 63, and a group of auxiliary blades 64, which are externally mounted on the motor shaft 53b, on the front surface of the disk-shaped impeller side plate 61 on the side of the intake port 54 toward the intake port 54 side. It is configured as an open-type impeller having the shape of an opening and having the intake port 54 side fully open, and is configured as an injection-molded resin integral molded product.

As shown in FIGS. 10 and 11, the main blade 6
3 is formed in a curved radial shape from the outer periphery of the boss 62 to the outer peripheral end of the impeller side plate 61, and is arranged in parallel at a constant pitch in the circumferential direction. It is formed in a curved radial shape over the outer peripheral end of the vehicle side plate 61 and is provided between the main blades 63.
By arranging the auxiliary blades 64 only on the outer peripheral side between the main blades 63 in this way, the number of blades is small at the central portion on the intake side of the impeller 52, and on the outer peripheral side where the intake air is accelerated. The number of blades increases, the centrifugal acceleration function of the blade group can be enhanced without increasing the intake resistance near the center, and the number of rotations required to obtain a required air volume can be reduced. In addition, since the blade interval at the outer peripheral portion is reduced, pressure fluctuations due to the rotation of the impeller 52 can be reduced. Has become.

Here, the height h1 of the main blade 63 from the impeller side plate 61 is set to be as low as the boss 62 on the center portion side of the casing 51 opposite to the intake port 54. On the outer peripheral side, the impeller side plate 6
The height h2 from 1 is set to a size close to the front and rear inner width in the casing 51, and an entrance space s is formed immediately inside the intake port 54 over the entire circumference. The outside air introduced into the main blades 63 smoothly flows between the main blades 63 with little resistance.

The height h3 of the auxiliary blade 64 disposed between the main blades 63 from the impeller side plate 61 is determined by the following formula.
Is set lower than the height h2 on the outer peripheral side and higher than the height h1 on the center side of the main blade 63, and the thickness t2 of the auxiliary blade 64 is smaller than the thickness t1 of the main blade 63. Hi, it is set to be large. That is, the main blade 63 has a high bending strength in the rotating direction, because the center side thereof is continuously provided on two surfaces orthogonal to the outer peripheral surface of the impeller side plate 61 and the outer peripheral surface of the boss 62. And the auxiliary blade 64
Is cantilevered from the impeller side plate 61 toward the intake port 54 side, and tends to decrease in rigidity in the direction of the blade surface to easily vibrate. To make up for it.

In this case, depending on conditions such as the material of the resin and the like, if the required rigidity is obtained only by suppressing the blade height of the auxiliary blade 64, the blade height becomes considerably low.
Although there is a possibility that the blade area of the auxiliary blade 64 may be small, the blade height of the auxiliary blade 64 is appropriately increased so that the cross-sectional area between the blades can be reduced. , The required rigidity can be ensured without making it too small, and a reduction in the blade area of the auxiliary blade 64 can be suppressed. Note that by cutting the edge of the auxiliary blade 64 on the center side diagonally toward the intake port 54 side,
Consideration is given so that the resistance when the intake outside air flows into the space between the main blades 63 is small.

As shown in FIG. 11, the impeller 5
In the vicinity of the center of the impeller side plate 61 in FIG. 2, a communication hole 76 penetrating in the axial direction is formed in a range between the outer peripheral surface of the boss 62 and the center side end of the auxiliary blade 64. A cooling air hole 77 is formed in the mounting flange 53a of the electric motor 53, and the vicinity of the communication hole 76 becomes a negative pressure portion as the impeller 52 rotates. Ventilation hole 7 of 53a
7, the hot air in the electric motor 53 is sucked.

When the hot air in the electric motor 53 is sucked, the inside of the motor cover 59 becomes negative pressure,
The outside air is sucked into the motor cover 59 through the gap between the wire 2 and the electric wire insertion port 71, and is sucked from the inside of the motor cover 59 into the motor housing through the suction hole 53 c of the electric motor 53, and is used for cooling the electric motor 53. Because

As shown in FIG. 12, a sealing ridge 73 having a tapered cross section is formed on the motor cover 59 so as to protrude annularly, and this sealing ridge 73 is attached to the front split casing 51A.
The sealing performance at the joint portion with the split casing 51A is improved by making the groove narrower and penetrating into the seal groove having the cross-sectional shape to closely engage with each other.

The structure of the split casings 51A and 51B will be described. As shown in FIGS. 9 to 12, each of the divided casings 51A and 51B is
A and 51B are formed by blow molding into a double-walled structure in which the wall portions 51a and 51b are hollow. In the case of employing the double wall structure as described above, the rigidity is increased and the resonance hardly occurs as compared with a casing having a single thin wall, and the wall itself has high soundproofing and sound absorbing effects. The wall parts 51a, 5 of the divided casings 51A, 51B
1b has a double wall structure, but as shown in FIGS. 10 and 13, flange portions 51c and 51d serving as mating surfaces when assembling the two split casings 51A and 51B.
In addition, an engaging ridge 66 and an engaging concave groove 67 that engage with each other are formed, and the engaging ridge 66 is provided by projecting outward with the outer wall of the double wall having a hollow space. At the same time, the engaging groove 67 is provided by inwardly recessing the outer wall of the double wall, and the engaging groove 67 is formed integrally with the front split casing 51A by blow molding, and the rear split casing 51B is formed. An engaging ridge 66 is integrally formed by blow molding of resin. Since the engagement ridge 66 is formed in a hollow state as described above, the engagement ridge 66 is easily deformed when fitted into the engagement concave groove 67, and the adhesion is improved. In the rear split casing 51B, the intake duct 56 is also formed integrally with the wall by blow molding.

In the flange portions 51c and 51d, bolting holes are formed outside portions where the engaging ridges 66 and the engaging concave grooves 67 are formed, and the portions where the bolting holes are formed are divided. The casings 51A and 51B are formed as a single plate obtained by compressing two plate members forming a double wall. Unlike the split casings 51A and 51B, the intake cover 57 and the motor cover 59 are formed by blow molding using a single plate as a raw material.

[Alternative Embodiment] (1) In the above embodiment, the split casing 51 is used.
A and 51B have been described as being manufactured separately by blow molding.
A form in which A and 51B are integrally molded will be described. As shown in FIG. 12, a pair of split casings 51A, 51A
B is extended in the left and right direction, and as shown in FIG. 14, a single plate portion is bridged as a connecting piece 68 over adjacent side surfaces, and the two divided casings 51A, 51B
Are connected together. Thus, the two split casings 51
The portions A and 51B and the connection piece 68 are integrally formed by blow molding. FIG. 14 shows the structure integrally formed in this manner.
Shown, two bending lines 68 formed on the connection piece 68.
a, 68a, the two split casings 51
A and 51B can be joined and assembled at the joint surface. As shown in FIG. 15, the bending lines 68a, 68a are formed by forming a thin portion in the connecting portion 68 formed in a plate shape. Instead, a configuration in which the wire is formed in a broken line shape may be adopted. When blow molding, each split casing 51
The intake port 54, the outside air intake port 56a, and the motor mounting hole 69 in A and 51B are formed by machining after blow molding. In the above alternative embodiment, the connecting portion 68 is provided with two bending lines 68a, 68a, but the number of bending lines 68a may be one. In FIG. 15, the bending lines 68 a, 68 a are provided on the upper surface side of the connection portion 68, but may be provided on the lower surface side of the connection portion 68. (2) The structure of the impeller 52 may be a structure in which only the main blade 63 is formed. (3) To form the engaging ridge 66, as shown in FIG. 16, when an internal space is to be formed by design, as shown in FIG. It may be the case that both walls are almost in contact and there is no internal space,
Further, as shown in FIG. 16C, the internal space formed in the engaging ridge 66 need not be in a state of communicating with the internal space of the casing.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rice transplanter with a fertilizer application device.

FIG. 2 is an overall plan view of a rice transplanter with a fertilizer application device.

FIG. 3 is a rear view of the fertilizer application device.

FIG. 4 is a longitudinal side view of the feeding mechanism.

FIG. 5 is a longitudinal rear view of the feeding mechanism.

FIG. 6 is a longitudinal rear view of the feeding mechanism including a pause.

FIG. 7 is a side view of the blower.

FIG. 8 is a rear view of the blower.

FIG. 9 is a longitudinal sectional side view of a blower.

FIG. 10 is a cross-sectional plan view of the blower.

FIG. 11 is a rear view of the impeller.

FIG. 12 is a front view showing a state in which a pair of split casings are deployed.

FIG. 13 is a cross-sectional view showing an engagement ridge and an engagement groove which can be disengaged from each other.

FIG. 14 is a front view showing a state in which a pair of split casings are connected by a connecting piece and blow molding is performed with the connected pair of split casings expanded.

15 is a sectional view taken along line AA in FIG.

FIG. 16 is a cross-sectional view showing another embodiment of the engagement ridge.

[Explanation of symbols]

 21 Hopper 51 Casing 51A, 51B Divided casing 51a, 51b Wall 52 Impeller 66 Engaging ridge 67 Engaging groove 68 Connection piece 68a Bending line

Claims (3)

[Claims] 1. A centrifugal fan for a fertilizer that wind-feeds a granular fertilizer fed from a hopper to a fertilizer application site, wherein an impeller that generates wind for conveyance is housed in a casing,
In order to form the casing by joining a pair of split casings divided into two in the direction of the rotation axis of the impeller, an engaging ridge having a hollow internal space on a joining surface of the pair of split casings. And an engaging concave groove for engaging with the engaging ridge, and a wall portion of each of the divided casings is formed in a double-walled structure having a space formed therein. A centrifugal fan for a fertilizer application, wherein at least one of the ridge or the engaging groove is integrally formed by blow molding of a resin. 2. A centrifugal fan for a fertilizer that wind-transports powdery and granular fertilizer fed from a hopper to a fertilizer application site, wherein an impeller that generates wind for transport is housed in a casing,
A pair of split casings obtained by dividing the casing into two in the direction of the axis of rotation of the impeller are formed into a double-walled structure in which a wall of the split casing is hollow, and the split casings are adjacent to each other. The pair of split casings are connected to each other via a connecting piece to be connected and bent at the connecting piece to form a pair of split casings so that they can be assembled together, and engage with each other on mating surfaces of the hollow double walls in the pair of split casings. An engaging ridge and an engaging groove are formed, and the engaging ridge is formed by projecting outward in an outer wall of the one divided casing in a hollow state, and the engaging groove is formed in the other divided casing. The outer wall of the casing is provided so as to be recessed inward, and each of the divided casings having the double wall structure, the engaging ridge, the engaging groove, and the connection piece are formed by blow molding of resin. Centrifugal fan for fertilizing device is formed in the body. 3. A centrifugal fan for a fertilizer that wind-transports a granular fertilizer fed from a hopper to a fertilizer application site, wherein an impeller that generates wind for transport is accommodated in a casing,
A pair of split casings obtained by dividing the casing into two in the direction of the axis of rotation of the impeller are formed into a double-walled structure in which a wall of the split casing is hollow, and the split casings are adjacent to each other. A pair of divided casings are connected to each other via a connecting piece to be connected and bent at the connecting piece portion so that a pair of split casings can be assembled and assembled, and a bending line at the time of assembling the pair of split casings to the connecting piece is formed. An engaging ridge and an engaging concave groove that engage with each other are formed on the mating surface of the hollow double walls of the pair of divided casings, and the engaging ridge is formed on the outer wall of the one divided casing. Are formed so as to protrude outwardly in a hollow state, and the engaging concave grooves are provided by inwardly recessing the outer wall of the other split casing, and Split casing, the engagement Gototsujo, the engaging recessed groove, and, a centrifugal fan for fertilizer apparatus are formed integrally with the connecting piece in blow molding of the resin.