JPH0613404Y2 - Variable speed drive for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an air conditioner that includes an electric motor and a transmission that changes the rotation of the electric motor in a stepwise manner and transmits the rotation to an air conditioning rotary load such as a blower. The present invention relates to a variable speed drive device.

2. Description of the Related Art As disclosed in, for example, Japanese Utility Model Publication No. 60-5291 or Japanese Utility Model Publication No. 62-9461, a drive path between an electric motor and a rotary load for air conditioning such as a blower or a water pump in an air conditioner. A technique is known in which a stepped transmission is provided therein, and the transmission speed of the transmission is switched by a feedback control or a timer control based on temperature detection to switch the drive speed of the air conditioning rotary load. In an air conditioner provided with such a transmission, the energy consumption of a fluid transportation machine such as a blower or a water pump is proportional to the cube of the number of revolutions and the energy consumption is halved when the number of revolutions is reduced to about 80%. Further, the stepped transmission configured as a mechanical type exhibits a high energy saving effect because the loss horsepower is extremely small and the energy efficiency is high.

By the way, in the case of introducing a transmission into an air conditioner designed to drive a rotating load for air conditioning such as a blower, which is relatively large in comparison with an electric motor, through a belt by an electric motor, conventionally, as shown in FIG. The arrangement was adopted.

That is, as illustrated in FIG. 7 (a), a coupling C is provided between the motor shaft 1a of the electric motor 1 and the input shaft Ga of the transmission G.
Is directly connected to the output shaft Gb of the transmission G, which is projected in the direction opposite to the input shaft Ga, by the pulley P ₁
7B, the belt B is wound around the pulley P ₁ and the pulley P ₂ on the input rotary shaft Fa of the air-conditioning rotary load F, as shown in FIG. 7B.

Therefore, when introducing a transmission into an existing air conditioner in which an electric motor drives a rotary load for air conditioning directly via a belt, it is necessary to replace the electric motor in the past, and in some cases. Therefore, it was necessary to relocate the air conditioning rotary load.

For this reason, conventionally, a space for introducing a transmission must be newly obtained in a small machine room, and a frame D for the electric motor 1 and the transmission G as shown in FIG. 7 is newly produced. I had to do it. The frame D as illustrated in FIG. 7 is expensive because it is formed as a slide type or a rotation type so that the position of the pulley P ₁ can be changed to give the belt B the necessary tension. .

In view of this, the present invention introduces a transmission, while the pulley on the motor side is provided on the motor shaft of the electric motor in an air conditioner in which an electric motor drives a rotary load for air conditioning directly through a belt. However, the output pulley of the transmission is provided at the same position as the pulleys arranged as described above, a special stand is not required due to the addition of the transmission, and it is particularly easy to assemble. The present invention seeks to provide a new variable speed drive for an air conditioner of a type.

Technical means taken to solve the problem. Therefore, as illustrated in FIG. 1, the present invention has an electric motor 1 and a rotation load for air-conditioning such as a blower that is capable of stepwise changing the rotation of the electric motor 1. The following technical means has been taken in the speed change drive device including the transmission 2 for transmitting to F (FIG. 4).

That is, as shown in FIGS. 1, 2 and 5, the bearing holding cylinder 3 having the protruding end portion 3a axially outward of the motor shaft 1a is installed on the motor shaft 1a of the electric motor 1. The bearing holding cylinder 3 is connected to the motor shaft 1a by a key 4 so as not to rotate relative to the motor shaft 1a, and the outer diameter surface of the bearing is supported by the motor shaft 1a and engages with the bearing holding cylinder 3 from the shaft end side of the motor shaft 1a. The ring 5 and the bearing holding cylinder 3 are tightened and held by bolts 15, and the outer diameter surface taper from the protruding end 3a side of the bearing holding cylinder 3 is engaged with the tapered surface of the ring 5 by a tapered surface. A pulley 7 for positioning on the motor shaft 1a by the attachment ring 6 and transmitting the belt to the air-conditioning rotational load F is loosely fitted on the bearing holding cylinder 3 via the bearing 8. Further, the spline 9 formed on the protruding end portion 3a of the bearing holding cylinder 3 and the spline 11 formed on the input end portion 10a of the input shaft 10 of the transmission 2 are meshed with each other to connect the motor shaft 1a and the input shaft 10 to each other. The output shaft 12 of the transmission 2 is formed hollow and provided concentrically with the input shaft 10, and the output end 12a of the output shaft 12 is connected to the transmission case of the transmission 2. It is projected from 13 in the same direction as the input shaft 10 and is connected to the pulley 7.

In the example shown in FIGS. 1 and 2, the inner diameter surface tapering ring 6 is provided with an integral flange portion 6a, and an inner diameter is provided by a bolt 15 screwed into a screw hole 14 of the bearing holding cylinder 3 through a hole of the flange portion 6a. The surface tapering ring 6 is tightened and held by the bearing holding cylinder 3. In the case shown in FIG. 5, an annular presser member 16 with a flange is provided separately from the inner diameter surface tapering ring 6 as shown in FIG. 6 and the bearing is passed through the flange hole 16a of the presser member 16. Bolt 1 screwed into the screw hole 14 of the holding cylinder 3
5, the inner diameter surface tapered ring 6 is tightened and held by the bearing holding cylinder 3.

Action When assembling the variable speed drive, as shown in the left half of FIG. 3, the bearing holding cylinder 3 and the pulley 7 are assembled on the motor shaft 1a. For that, bearing 8
The bearing holding cylinder 3 on which the pulley 7 is mounted is fitted on the motor shaft 1a by the key 4 and then the outer diameter surface tapering ring 5 is externally fitted on the end of the motor shaft 1a. The inner diameter surface tapering ring 6 is attached to the protruding end portion 3a of the bearing holding cylinder 3.
From the side to the taper surface of the outer diameter surface tapering ring 5, the flange portion 6a is used as it is in the example of FIG. 1-3, and the inner diameter surface tapering ring is used in the example of FIG. A presser foot 16 is provided on the outer end surface of the inner surface 6, and the presser foot 16 is used to tighten and hold the inner diameter surface tapered ring 6 with respect to the bearing holding cylinder 3 by the bolt 15. As a result, the tapered surfaces of the two tapering rings 5 and 6 are engaged with each other, and the bearing holding cylinder 3 and the pulley 7 are accurately positioned on the motor shaft 1a, and the position in the axial direction is fixed.

Next, as shown in the right half of FIG.
The input end 10a of the input shaft 10 is moved closer to the a direction.
The spline 11 of the bearing holding cylinder 3 protruding end 3a
Mesh with the spline 9 and then connect the output end 12a of the transmission output shaft 12 to the pulley 7 by the connecting members 17 and 18. In the illustrated example, the output end portion 12a of the output shaft 12 is formed on the flange portion, and the coupling tool is screwed to the flange portion and extends through the axial through hole 7a formed in the pulley 7 to the outside of the other end surface of the pulley 7. It is provided with a connecting screw rod 17 which is projected and a nut 18 which is screwed to the end of the screw rod 17.

After that, as long as the transmission 2 is stopped by a simple stay, the transmission drive can be operated as required.

Embodiment FIG. 4 shows an air conditioner configured in an air handling unit equipped with an embodiment. The illustrated air handling unit is a horizontal type in which a blower F and a heat exchanger HE are arranged side by side, and the heat exchanger HE includes an air filter A.
F is attached.

The speed change drive device according to the present invention is installed on the upper surface of the blower F, and is transmitted from the pulley 7 to the pulley P on the input rotation shaft Fa of the blower F by the belt B. The electric motor 1 is installed on a pedestal D whose rotation can be adjusted to give tension to the belt B, and the transmission 2 is stopped by a stay (not shown) attached to the pedestal D.

As shown in FIG. 1, the bearing 8 is a pair of ball bearings with an oil seal whose position is constrained between the bearing holding cylinder 3 and the pulley 7. On the inner peripheral surface of the bearing holding cylinder 3, there are formed an inner diameter enlarging portion 19 for providing an annular gap with the end peripheral surface of the motor shaft 1a, and subsequently an inner diameter enlarging portion 20 reaching the protruding end portion 3a. Is
The outer diameter surface tapering ring 5 is engaged with the bearing holding cylinder 3 by the inner end surface 21 of the former inner diameter enlarging portion 19. The outer diameter taper ring 6 is the former inner diameter enlarged portion 19
And the flange portion 6a of the ring 6 is located in the inner diameter enlarging portion 19 of the latter. The input end 10a of the transmission input shaft 10 is provided as an annular body fixedly installed on the input shaft 10 outside the transmission case 13 by welding. The transmission 2 as shown in FIG.
A positioning pin fitted into the positioning hole 22 of the output shaft output end 12a so as to position the pulley 7 and the output shaft 12 in the circumferential direction when the splines 9 and 11 are assembled while being engaged with each other. 23 is attached to the pulley 7.

The structure of the transmission 2 will be described with reference to FIG. 1. Inside the transmission case 13, a lower intermediate shaft 25 parallel to the input shaft 10 and the output shaft 12 arranged concentrically is provided. A gear 26 is fitted on the input shaft 10 by using a key 27, and a gear 28 meshed with the gear 26 is press-fitted on the intermediate shaft 25. A gear 30 is loosely fitted on the intermediate shaft 25 via a pair of ball bearings 29, and a gear 31 meshed with the gear 30 is integrally formed on the inner end of the output shaft 12. The hollow output shaft 12 is supported on the transmission case 13 on the outer peripheral surface side by a ball bearing 32, and also on the inner peripheral surface by a pair of ball bearings 33, 34 provided on the input shaft 10 and the gear 26 boss portion. Input shaft 1 on the surface side
Stable support is achieved as a relationship of being supported at two positions spaced apart by zero.

The gear 26 on the input shaft 10 has a cylindrical boss extension 26
a is provided, and one and the other friction element is slidably engaged with a claw hole 35 formed in the boss extension 26a and a claw hole 36 formed in the inner peripheral surface of the output shaft 12, respectively. A multi-plate hydraulic clutch 37 including is disposed between the input shaft 10 and the output shaft 12. The piston 38 of the hydraulic clutch 37 is arranged on the input shaft 10 so as to be in oil-tight contact with the large diameter portion and the small diameter portion of the input shaft 10 and is moved by the return spring 39 in the direction opposite to the friction element group. It is energized. When the hydraulic pressure is supplied to the piston 38 and the friction element is engaged by the piston 38 to operate the hydraulic clutch 37, the output shaft 12
Will be connected to the input shaft 10 so as to rotate integrally with the input shaft 10.

The gear ratio of the gear train composed of the gears 26, 28, 30, 31 from the input shaft 10 to the output shaft 31 via the intermediate shaft 25 reduces the rotation of the input shaft 10 to about 80% and transmits it to the output shaft 12. The one-way clutch 40 that engages when driven from the side of the intermediate shaft 25 is arranged between the intermediate shaft 25 and the gear 30 loosely fitted thereto. When the hydraulic clutch 37 in which the output shaft 10 rotates at the same speed as the input shaft 8 is in the operating state, the one-way clutch 40 is relatively driven from the gear 30 side and does not engage, and the one-way clutch 40 is in one direction when the hydraulic clutch 37 is cut. The clutch 40 is automatically engaged and the output shaft 12 is rotated at a rotational speed of about 80% of the rotational speed of the input shaft 10.

The gear case 13 also serves as an oil tank for the hydraulic clutch 37.
As shown in FIG. 1, a gear pump 41 for supplying hydraulic oil from the inside is installed on the end surface of the transmission case 11 with its pump shaft 41 a engaged with the intermediate shaft 25.
A control valve device 42 that controls supply and discharge of hydraulic pressure to and from the hydraulic clutch 37 is installed on the upper surface of the transmission case 13. The hydraulic oil passage and the lubricating oil passage (above, not shown) led out from the inside of the control valve device 42 pass through the hydraulic oil passage 43 and the lubricating oil passage 44 in the input shaft 8, respectively, and the piston 38 portion of the hydraulic clutch 37. And the friction element part.

The embodiment shown in FIGS. 5 and 6 is different from the embodiment shown in FIGS. 1 to 3 except that the annular pressing member 16 which is separate from the inner diameter surface tapering ring 6 is provided as described above. Absent.

The illustrated speed change drive device is used in an air conditioner in the mode illustrated in FIG. 4, for example, and the pulley 7 is driven by an electric motor by the operation of the hydraulic clutch 37 under the control of the control valve device 42 by detecting the temperature in the air-conditioned space. 1 and a state in which the pulley 7 is driven at a rotation speed of about 80% of the rotation speed of the electric motor 1 by cutting the hydraulic clutch 37, and temperature control under energy saving is achieved. To get

Advantageous Effects of Invention The variable speed drive device for an air conditioner according to the present invention includes a pulley 7 for transmitting a belt to a rotating load for air conditioning, a motor shaft 1
In the air conditioner, which is arranged on the motor shaft 1a via the bearing holding cylinder 3 fixedly connected to a and the bearing 8 thereon, and in which the electric motor directly drives the rotary load for air conditioning, the pulley on the motor side The pulley 7 is arranged at a position similar to that of the motor shaft 1a. Further, the transmission shaft 10 is connected to the bearing holding cylinder 3 on the motor shaft 1a by splines 9 and 11, and the transmission shaft 10 is connected to the motor shaft 1a. It is assumed that a transmission in which a hollow output shaft 12 is connected to the pulley 7 is provided and the transmission 2 is supported by the motor shaft 1a so that the transmission 2 is simply prevented from rotating. When installing a transmission in an air conditioner in which an electric motor drives a rotary load for air conditioning directly via a belt, install the electric motor as it is on the frame. And it can assemble the transmission keep in, does not require Toka rearrange the newly established stand Toka electric motor and the air conditioning rotational load.

In particular, the present invention provides a transmission 2 having an input shaft 10 and an output shaft 12 which are respectively connected to a bearing holding cylinder 3 and a pulley 7 on a motor shaft 1a, and before mounting the transmission 2, the bearing 2 is provided. The bearing holding cylinder 3 on which the pulley 7 is mounted via 8 is locked onto the motor shaft 1a by the key 4 and a pair of taper rings 5, 6
Then, the transmission 2 can be assembled after that by simply connecting the input shaft 10 to the bearing holding cylinder 3 by connecting the splines 9 and 11, and then connecting the output shaft 12 to the pulley 7. As a result, it is possible to assemble the variable speed drive device very easily.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a main part of an embodiment of the present invention, and FIG. 2 is an enlarged vertical sectional side view showing a part of FIG.
FIG. 3 is an exploded vertical side view for explaining the assembling process of the same embodiment, FIG. 4 is a side view showing an air conditioner equipped with the embodiment, and FIG. 5 is a vertical side view of a part of another embodiment. , Sixth
FIG. 7 is a schematic perspective view showing several parts of another embodiment, FIG.
(a), (b) is a typical side view and front view of an air conditioner equipped with a conventional example, respectively. DESCRIPTION OF SYMBOLS 1 ... Electric motor, 1a ... Motor shaft, 2 ... Transmission, 3 ... Bearing holding cylinder, 3a ... Projection end part, 4 ... Key, 5 ... Outer diameter surface tapering ring, 6 ... Inner diameter surface tapering ring, 6
a ... flange portion, 7 ... pulley, 8 ... ball bearing, 9 ... spline, 10 ... input shaft, 10a ... input end portion, 11 ... spline, 12 ... output shaft, 12a ... output end portion, 13 ... transmission case, 14 … Screw holes, 15… Bolts,
16 ... Annular presser fitting, 17 ... Connection screw, 18 ... Nut,
25 ... Intermediate shaft, 26, 28, 30, 31 ... Gear, 37 ...
Hydraulic clutch, 40 ... One-way clutch, F ... Rotating load for air conditioning (blower).

Claims (1)

[Scope of utility model registration request] 1. A shift drive device comprising an electric motor 1 and a transmission 2 for stepwisely changing the rotation of the electric motor 1 and transmitting the rotation to a rotary load F for air conditioning such as a blower. A bearing holding cylinder 3 having a protruding end portion 3a outwardly in the axial direction of the motor shaft 1a is installed on the shaft 1a, and the bearing holding cylinder 3 is connected by a key 4 so as not to rotate relative to the motor shaft 1a. With
The outer diameter taper ring 5 that is supported by the motor shaft 1a and engages with the bearing holding cylinder 3 from the shaft end side of the motor shaft 1a and the bearing holding cylinder 3 is tightened and held by bolts 15 and the bearing holding cylinder 3 is projected. The motor shaft 1 is provided with the inner diameter surface taper ring 6 which engages with the taper surface of the outer diameter surface taper ring 5 from the end portion 3a side.
A pulley 7 for positioning on a, and transmitting a belt to the air-conditioning rotary load F is loosely fitted and installed on the bearing holding cylinder 3 via a bearing 8, and further on the protruding end portion 3a of the bearing holding cylinder 3 described above. The formed spline 9 meshes with the spline 11 formed at the input end 10a of the input shaft 10 of the transmission 2 to interlock the motor shaft 1a and the input shaft 10 and to output the output shaft 12 of the transmission 2. Is formed in a hollow shape and arranged concentrically with the input shaft 10, and the output end 12a of the output shaft 12 is projected from the transmission case 13 of the transmission 2 in the same direction as the input shaft 10 and the pulley 7 is provided. A variable speed drive device for an air conditioner, characterized in that it is connected to.