JP2008120260A - Motor pack unit for transport refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor pack unit for a transport refrigerator implementing weight reduction and cost reduction, by decreasing stiffness of a box-shaped main frame constituting a skeleton of a unit body. <P>SOLUTION: In the motor pack unit 1 for transport refrigerator, inside the unit body 11 with the skeleton constituted of the box-like main frame 12, at least an electric motor 15 and a refrigeration compressor 14, driven by the electric motor 15 through a belt 17 and pulleys 15C, 14A, are installed through a main frame 12B, and an upper surface of the unit body 11 is suspended on a vehicle 2 side. The main frame 12B to which the refrigeration compressor 14 and the electric motor 15 are installed is disposed on an upper surface side of the unit body 11, and the refrigeration compressor 14 and the electric motor 15 are suspended from the main frame 12B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor pack unit of a transport refrigeration apparatus mounted on a refrigeration vehicle and used for cooling the inside of the refrigeration container.

A motor pack unit of a transport refrigeration apparatus has a unit body having a skeleton formed by a box-shaped main frame, and an electric motor that is driven by power supplied from at least an external power source, and the electric motor Thus, a refrigerant compressor driven via a belt and a pulley is installed via the main frame.
The motor pack unit is generally mounted on a horizontal joist provided on the lower surface of the refrigeration container (see, for example, Patent Documents 1 and 2).

  In the motor pack unit described above, components such as heavy electric motors and refrigerant compressors are directly installed on the lower frame of the main frame, or those devices are installed on a common frame, Any one of the configurations in which the common frame is supported in an anti-vibration manner on the lower frame of the main frame via an anti-vibration rubber is employed (see, for example, Patent Document 3).

JP-A-63-254369 Japanese Patent Laid-Open No. 8-1119027 JP 2001-74337 A

However, the motor pack unit described above has heavy components such as an electric motor and a refrigerant compressor installed on the lower frame of the main frame directly or via a common mount, and is provided on the lower surface of the refrigeration container. Therefore, it is necessary to increase the rigidity of the entire main frame constituting the skeleton of the unit body. As a result, there is a problem that the weight of the unit main body is increased and the cost is increased by an amount corresponding to the material corresponding to at least the heavy weight.
In particular, exhaust gas regulations for vehicles are becoming more stringent in recent years, and it is essential to install auxiliary equipment for that purpose.Therefore, there is a high demand for weight reduction on the refrigeration equipment side, and reducing the weight of motor pack units is an urgent issue. It has become.

  The present invention has been made in view of such circumstances, and it is possible to achieve weight reduction and cost reduction by reducing the rigidity of the box-type main frame constituting the skeleton of the unit body. An object of the present invention is to provide a motor pack unit for a transport refrigeration apparatus.

In order to solve the above problems, the motor pack unit of the transport refrigeration apparatus of the present invention employs the following means.
That is, the motor pack unit of the transport refrigeration apparatus according to the present invention includes at least an electric motor and a refrigerant driven by the electric motor via a belt and a pulley inside a unit main body constituted by a box-shaped main frame. In the motor pack unit of the transport refrigeration apparatus in which the compressor is installed via the main frame and the upper surface of the unit main body is mounted on the vehicle side, the main frame in which the refrigerant compressor and the electric motor are installed Is provided on the upper surface side of the unit body, and the refrigerant compressor and the electric motor are suspended from the main frame.

  According to the present invention, the main frame on which the refrigerant compressor and the electric motor are installed is provided on the upper surface side of the unit body, and the refrigerant compressor and the electric motor are suspended on the main frame, which is heavy. The refrigerant compressor and the electric motor can be suspended from the main frame at a position near the vehicle-side mounting location on the upper surface of the unit main body. For this reason, rigidity other than the part where the refrigerant compressor and electric motor of the box-type main frame constituting the skeleton of the unit main body are suspended can be greatly reduced. Therefore, the weight of the motor pack unit can be reduced by an amount corresponding to the rigidity reduction, and the cost can be reduced.

  Furthermore, the motor pack unit of the transport refrigeration apparatus of the present invention is characterized in that, in the motor pack unit of the transport refrigeration apparatus, the refrigerant compressor is suspended from the main frame via a compressor column. And

  According to the present invention, since the refrigerant compressor is suspended from the main frame via the compressor column, the refrigerant column having a specific shape, weight and size is provided with a compressor column suitable for supporting the refrigerant compressor. Thus, the required strength can be secured to the main frame.

  Furthermore, the motor pack unit of the transport refrigeration apparatus of the present invention is the motor pack unit of the transport refrigeration apparatus, wherein the refrigerant compressor has a lower support portion of the refrigerant compressor with respect to the compressor column. The upper support portion is rotatably supported around a fixed shaft, and the upper support portion is rotatably supported around the fixed shaft.

  According to the present invention, in the refrigerant compressor, the lower support portion of the refrigerant compressor is rotatably supported around the fixed shaft with respect to the compressor column, and the upper support portion rotates about the fixed shaft. Since the upper support portion of the refrigerant compressor is rotated about the fixed shaft as a fulcrum, tension can be applied to the belt mounted between the electric motor. For this reason, a tension pulley can be made unnecessary. Therefore, the number of parts and the manufacturing cost can be reduced. Further, since the distance between the electric motor and the refrigerant compressor can be shortened, the entire unit can be reduced in size and weight.

  Furthermore, the motor pack unit of the transport refrigeration apparatus of the present invention is the motor pack unit of the transport refrigeration apparatus, wherein the upper support portion of the refrigerant compressor is along a long hole provided in the compressor column. It is supported by a bolt and a nut so as to be rotatable.

  According to the present invention, the upper support portion of the refrigerant compressor is rotatably supported via the bolt and the nut along the long hole provided in the compressor column, so that the nut is loosened or tightened. Thus, the upper support portion of the refrigerant compressor can be rotated. Therefore, the belt tension can be easily adjusted.

  Furthermore, the motor pack unit of the transport refrigeration apparatus according to the present invention is the motor pack unit of any one of the transport refrigeration apparatuses described above, wherein the electric motor sandwiches the compressor column with the compressor column and compresses the refrigerant. It is installed on the surface opposite to the machine, and is suspended from the main frame via the compressor column.

  According to the present invention, since the electric motor is suspended from the main frame via the compressor column, the electric motor can be installed on the main frame while sharing the compressor column. Therefore, the number of parts can be further reduced and the entire unit can be reduced in size and weight. In addition, since the electric motor is suspended on the surface opposite to the refrigerant compressor across the compressor column, the tension applied to the belt mounted between the refrigerant compressor and the electric motor is caught on the compressor column. Can be matched. Therefore, the bending load acting on the compressor column can be reduced.

  Further, the motor pack unit of the transport refrigeration apparatus of the present invention is the motor pack unit of the transport refrigeration apparatus, wherein the electric motor is supported by the compressor column so as to be slidable in the vertical direction, and the refrigerant compressor Is fixedly installed on the compressor column.

  According to the present invention, the electric motor is supported on the compressor column so as to be slidable in the vertical direction, and the refrigerant compressor is fixedly installed on the compressor column. It will always slide downward. Therefore, when the belt mounted between the refrigerant compressor and the electric motor extends, the electric motor slides downward due to its own weight, and tension can be naturally applied to the belt using the own weight of the electric motor. .

  Furthermore, the motor pack unit of the transport refrigeration apparatus according to the present invention is the motor pack unit of any one of the transport refrigeration apparatuses described above, wherein the compressor column has two sides between the main frame and a delivery channel orthogonal thereto. The reinforcing girder is fixed, and a reinforcing girder is installed between the opposite side of the main frame and the other part of the main frame.

  According to the present invention, two sides of the compressor column are fixed between the main frame and the crossing channel orthogonal to the main frame, and the reinforcing beam is installed between the non-fixed end side with respect to the main frame and the other part of the main frame. Therefore, the eigenvalue of the vibration mode in which the compressor column tends to fall back and forth can be increased by this reinforcing beam. Accordingly, it is possible to improve the vibration resistance of the unit including the compressor column and the main frame.

  Furthermore, the motor pack unit of the transport refrigeration apparatus of the present invention is the motor pack unit of any one of the transport refrigeration apparatuses described above, wherein the refrigerant pipe connected to the refrigerant compressor is connected to the motor compressor unit from the upper surface of the refrigerant compressor. It is arranged in a loop shape over the lower surface.

  According to the present invention, the refrigerant pipe connected to the refrigerant compressor is arranged in a loop from the upper surface of the refrigerant compressor to the lower surface thereof, so that the refrigerant compressor can be vibrated or when belt tension is applied. Even if it is moved, the movement can be absorbed by the loop-shaped portion of the refrigerant pipe. Therefore, the refrigerant pipe is not stretched by the above movement, and the refrigerant pipe can be prevented from being damaged.

  According to the present invention, the rigidity of the box-type main frame constituting the skeleton of the unit main body can be greatly reduced in rigidity other than the portion where the electric motor is suspended, so that the motor is equivalent to the rigidity reduction. The weight of the pack unit can be reduced and the cost can be reduced.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a side view of a state in which a motor pack unit 1 of a transport refrigeration apparatus according to a first embodiment of the present invention is mounted on a refrigeration vehicle 2.
The refrigeration vehicle 2 is equipped with a refrigeration container 4 behind the cabin 3. The motor pack unit 1 of the transport refrigeration apparatus is mounted on a lower surface of the refrigeration container 4 between horizontal joists (not shown) provided in large numbers at predetermined intervals in a direction orthogonal to the vehicle frame 5.

As shown in FIG. 2, the motor pack unit 1 includes a unit main body 11 having a skeleton composed of a box-shaped main frame 12, a refrigerant compressor 14 that compresses refrigerant therein, and a refrigerant compressor 14. And an electric motor 15 for driving the motor.
3 and 4 show a perspective view from a diagonally lower state and a perspective view from a diagonally upper side in a state where a part of the outer plate 13 of the unit main body 11 is removed. 3 and 4, the main body of the refrigerant compressor 14 is not shown.
As shown in FIGS. 3 and 4, the unit main body 11 is formed by cutting a plate-like long member 12A into a predetermined length and framing it into a rectangular shape to form a box-shaped main frame 12, which is externally attached. The plate 13 is attached.

On the upper surface side of the unit main body 11, two Z channels 12 </ b> B and 12 </ b> B constituting a part of the main frame 12 are installed between the long members 12 </ b> A in parallel at a predetermined interval.
The refrigerant compressor 14 is suspended from the main frame 12 by being fixedly installed on a compressor column (bracket) 16 provided between the two Z channels 12 </ b> B and 12 </ b> B of the main frame 12. The refrigerant compressor 14 is equipped with a pulley 14A with an electromagnetic clutch at the end of a drive shaft that protrudes toward one end of the main body.

  The electric motor 15 has two mounting legs 15A and 15A provided in parallel along the motor shaft direction on the outer periphery of the main body, and is mounted on the end of the motor shaft 15B protruding to one end of the main body. The motor pulley 15C is provided. The electric motor 15 is suspended from the main frame 12 by installing and fixing the mounting legs 15A and 15A between the two Z channels 12B and 12B of the main frame 12 in a direction orthogonal to each other. The electric motor 15 is supplied with electric power from an external power source (AC 200 V) via an outlet (not shown) when the refrigerated vehicle 2 is stopped in a yard or the like.

  A belt 17 is mounted between the pulley 14A with an electromagnetic clutch of the refrigerant compressor 14 and the motor pulley 15C of the electric motor 15, so that the rotational driving force of the electric motor 15 is transmitted to the refrigerant compressor 14. It has become. The belt 17 is configured to be appropriately tensioned by a tension pulley 18 provided on the compressor column (bracket) 16.

With the above configuration, according to the present embodiment, the following operational effects are obtained.
When the frozen vehicle 2 is stopped in a yard or the like, electric power can be supplied to the electric motor 15 by connecting an outlet (not shown) of the motor pack unit 1 to an external power source, and the electric motor 15 can be rotated. This rotational driving force is transmitted to the refrigerant compressor 14 via the motor pulley 15C, the belt 17 and the pulley 14A with electromagnetic clutch, and the refrigerant compressor 14 is driven. Thereby, a refrigerant | coolant is compressed and it uses for cooling in the refrigeration container 4 by circulating to a refrigerating cycle.

  In the present embodiment, among the components of the motor pack unit 1, the heavy refrigerant compressor 14 and the electric motor 15 are suspended from the Z channel 12 </ b> B of the main frame 12 provided on the upper surface side of the unit body 11. . By setting it as such a structure, a heavy article can be installed in the unit main body 11 in the position close | similar to the fixed point to the refrigeration container 4 on the unit main body 11 upper surface. For this reason, the rigidity of the box-type main frame 12 constituting the skeleton of the unit main body 11 can be greatly reduced in rigidity other than the portion where the refrigerant compressor 14 and the electric motor 15 are suspended.

  Therefore, according to the present embodiment, the weight of the motor pack unit 1 can be reduced by an amount corresponding to the rigidity reduction of the main frame 12, and the cost can be reduced. Incidentally, in the motor pack unit 1 of the present embodiment, the refrigerant compressor has a weight of about 50 kg compared with the conventional unit weight in which heavy objects such as a refrigerant compressor and an electric motor are mounted on the lower frame of the main frame. It is expected that it can be reduced to about 32 kg, including 14 smaller and lighter.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment differs from the first embodiment described above in the suspension structure of the refrigerant compressor 14. Since other points are the same as those in the first embodiment, description thereof will be omitted.
The compressor column 26 in the present embodiment has the following configuration in order to rotatably install the refrigerant compressor 14.
The compressor column 26 is a suspension bracket in which two sides are suspended between a transfer channel 12C (see FIG. 4) installed between the two Z channels 12B and 12B and one Z channel 12B. It has a pair of compressor mounting portions 26A, 26A cut out in a C shape.

The C-shaped notches of the compressor mounting portions 26A and 26A have a shape along the outer periphery of the refrigerant compressor 14, and the refrigerant compressor 14 is mounted in the C-shaped notch space (see FIG. 5). A fixed shaft (bolt shaft) 27 is provided on the lower jaw portion of the compressor mounting portions 26A and 26A, and the lower support portion 14B of the refrigerant compressor 14 is fixed and supported around the fixed shaft 27 so as to be freely rotatable.
Further, a long hole 28 is provided in the upper jaw portion of the compressor mounting portions 26A, 26A, and the upper support portion 14C of the refrigerant compressor 14 extends the fixed shaft 27 through bolts and nuts 29 along the long hole 28. A pivot is supported on the fulcrum.

In this way, the refrigerant compressor 14 is supported by the compressor mounting portions 26A and 26A of the compressor column 26 so as to be rotatable about the fixed shaft 27 and suspended on the main frame 12, whereby the refrigerant compressor 14 is supported. The tension pulley 18 (see FIG. 2) provided for applying tension to the belt 17 mounted between the electric motor 15 and the electric motor 15 can be eliminated.
Further, as described above, in order to allow the movement of the refrigerant compressor 14 rotatably supported, the suction pipe 30A and the discharge pipe 30B connected to the refrigerant compressor 14 are respectively connected from the upper surface of the refrigerant compressor 14. It is arranged in a loop over the lower surface.

Thus, according to the present embodiment, the same effects as those of the first embodiment described above can be obtained, and the following specific effects can be obtained.
That is, the lower support portion 14B of the refrigerant compressor 14 is fixedly supported rotatably around the fixed shaft 27, and the upper support portion 14C supports the fixed shaft 27 along the long hole 28 via the bolts and nuts 29. Since the bolts and nuts 29 are loosened or tightened, the refrigerant compressor 14 can be rotated about the fixed shaft 27 as a fulcrum. This makes it possible to apply tension to the belt 17 mounted between the pulley 14 </ b> A with the electromagnetic clutch of the refrigerant compressor 14 and the motor pulley 15 </ b> C of the electric motor 15.

Therefore, the tension pulley 18 as shown in FIG. 2 can be eliminated, the number of parts can be reduced, and the manufacturing cost can be reduced.
Further, since the tension pulley 18 is not required, the distance between the refrigerant compressor 14 and the electric motor 15 can be reduced, so that the width of the unit main body 11 is reduced and the motor pack unit 1 is reduced in size and weight. be able to.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The present embodiment differs from the first and second embodiments described above in the suspension structure of the electric motor 15. Since other points are the same as those in the first and second embodiments, description thereof will be omitted.
In the present embodiment, the electric motor 15 is fixedly installed on the surface of the compressor column 26 opposite to the compressor mounting portions 26 </ b> A and 26 </ b> A, and the electric motor 15 is connected to the main frame 12 on the compressor column 26. Suspended through.
In this way, by installing the electric motor 15 on the compressor column 26 that suspends the refrigerant compressor 14, the electric motor 15 can be suspended on the main frame 12 by sharing the compressor column 26. For this reason, the attachment parts of the refrigerant compressor 14 and the electric motor 15 can be shared.

Thus, according to the present embodiment, the same effects as the first and second embodiments can be obtained, and the following specific effects can be obtained.
By sharing mounting parts, the number of parts can be further reduced and the unit body 11 can be reduced in size and weight.
Further, since the electric motor 15 is suspended on the opposite surface of the refrigerant compressor 14 with the compressor column 26 interposed therebetween, the tension applied to the belt 17 mounted between the two is balanced on the compressor column 26. be able to. Thereby, since the bending load which acts on the compressor support | pillar 26 can be reduced, the rigidity of the compressor support | pillar 26 can be reduced correspondingly and it can be reduced in weight.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
This embodiment differs from the first to third embodiments described above in the suspension structure of the refrigerant compressor 14 and the electric motor 15. Since other points are the same as those in the first to third embodiments, description thereof will be omitted.
In the present embodiment, in the refrigerant compressor 14, both the upper and lower support portions 14 </ b> B and 14 </ b> C are fixedly installed on the compressor mounting portions 26 </ b> A and 26 </ b> A of the compressor column 26 with bolts and nuts 31.
The electric motor 15 is installed such that its mounting leg 15A is slidable in the vertical direction (in the direction of the solid arrow shown in FIG. 7) with respect to the compressor column 26 via a slide groove (not shown). The

In this way, the refrigerant compressor 14 is fixedly installed on the compressor column 26, and the electric motor 15 is slidably installed in the vertical direction, so that the electric motor 15 can move against the compressor column 26 by its own weight. Will always slide downward.
For this reason, when the belt 17 mounted between the refrigerant compressor 14 and the electric motor 15 extends and the tension is loosened, the electric motor 15 slides downward due to its own weight, and naturally due to its own weight with respect to the belt 17. Tension can be applied. Thereby, maintenance can be facilitated.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the first to fourth embodiments described above in the configuration of the compressor column 26. Since other points are the same as those in the first to fourth embodiments, the description thereof will be omitted.
In the present embodiment, with respect to the compressor column 26 that is suspended with two sides fixed between the transfer channel 12C laid between the two Z channels 12B and 12B and one Z channel 12B, A reinforcing girder 40 is provided between the opposite end of the compressor column 26 with respect to one Z channel 12B and the other Z channel 12B.

  In this way, by installing the reinforcing beam 40 from the opposite side of the compressor column 26 to the one Z channel 12B to the other Z channel 12B, a vibration mode in which the compressor column 26 tends to fall back and forth. The eigenvalue can be increased. For this reason, the vibration resistance strength of the motor pack unit 1 including the compressor support 26 and the main frame 12 can be improved.

It is a side view of the refrigeration vehicle carrying the motor pack unit of the transportation refrigeration equipment concerning a 1st embodiment of the present invention. It is a schematic block diagram of the motor pack unit of the transport refrigeration apparatus according to the first embodiment of the present invention. It is a perspective view from the slanting lower part of the state which removed the outer plate | board of the motor pack unit of the transport refrigeration apparatus which concerns on 1st and 2nd embodiment of this invention. It is a perspective view from diagonally upward of the state which removed the outer plate | board of the motor pack unit of the transport refrigeration apparatus which concerns on 1st and 2nd embodiment of this invention. It is a schematic block diagram of the motor pack unit of the transport refrigeration apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the motor pack unit of the transport refrigeration apparatus which concerns on 3rd Embodiment of this invention. It is a schematic block diagram of the motor pack unit of the transport refrigeration apparatus which concerns on 4th Embodiment of this invention. It is a fragmentary perspective view of the main frame of the motor pack unit of the transport refrigeration equipment concerning a 5th embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor pack unit 2 Refrigeration vehicle 11 Unit main body 12 Main frame 12B Z channel 12C Delivery channel 14 Refrigerant compressor 14A Electromagnetic clutch pulley 14B Lower support part 14C Upper support part 15 Electric motor 15C Motor pulley 17 Belts 16, 26 Compressor support 27 Fixed shaft 28 Long hole 29 Bolt / nut 30A Suction pipe 30B Discharge pipe 40 Reinforcement girder

Claims (8)

At least an electric motor and a refrigerant compressor driven by the electric motor through a belt and a pulley are installed through the main frame inside the unit main body constituted by a box-shaped main frame, and the unit main body In the motor pack unit of the transport refrigeration system whose upper surface is mounted on the vehicle side,
The main frame on which the refrigerant compressor and the electric motor are installed is provided on the upper surface side of the unit body,
The motor pack unit of the transport refrigeration apparatus, wherein the refrigerant compressor and the electric motor are suspended on the main frame.   The motor pack unit of the transport refrigeration apparatus according to claim 1, wherein the refrigerant compressor is suspended from the main frame via a compressor column.   In the refrigerant compressor, a lower support portion of the refrigerant compressor is rotatably supported around a fixed shaft with respect to the compressor column, and an upper support portion is rotatable about the fixed shaft. The motor pack unit of the transport refrigeration apparatus according to claim 2, wherein the motor pack unit is supported.   The refrigeration for transportation according to claim 3, wherein the upper support portion of the refrigerant compressor is rotatably supported via a bolt and a nut along a long hole provided in the compressor column. The motor pack unit of the device.   The electric motor is installed on a surface opposite to the refrigerant compressor with the compressor column interposed between the compressor column, and is suspended from the main frame via the compressor column. The motor pack unit of the transport refrigeration apparatus according to any one of claims 2 to 4.   The refrigeration apparatus for transportation according to claim 2, wherein the electric motor is supported by the compressor column so as to be slidable in the vertical direction, and the refrigerant compressor is fixedly installed on the compressor column. Motor pack unit.   The compressor column has two sides fixed between the main frame and a crossing channel orthogonal to the main frame, and a reinforcing girder is installed between the opposite side of the main frame and the other part of the main frame. The motor pack unit of the transport refrigeration apparatus according to any one of claims 2 to 6. The transportation pipe according to any one of claims 1 to 7, wherein the refrigerant pipe connected to the refrigerant compressor is arranged in a loop from the upper surface of the refrigerant compressor to the lower surface thereof. Motor pack unit for refrigeration equipment.

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