JP4807350B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner used in a computer room.

  In an air conditioner that cools a computer room, a heat exchanger is arranged in the upper stage of the casing of the indoor unit, and one motor and two fans are arranged in the lower stage. Then, the motor rotates the two fans, so that the air in the computer room is sucked from the upper surface of the casing, cooled by the heat exchanger, and then blown out from below the casing (see, for example, Patent Document 1). . Furthermore, in recent years, an air conditioner is used in which a heat exchanger is arranged in the upper stage of the casing, one motor and two fans are arranged in the middle stage, and a compressor is arranged in the lower stage.

In an air conditioner equipped with a compressor in the lower stage of the casing as described above, a pipe and equipment mounted on the upper part of the compressor are housed with a motor and a fan so that the space in the casing is effectively used. It occupies a part of the middle space. As a result, when the operator performs maintenance on the motor and the fan, it is not easy to take out the motor and the fan from the front surface of the casing, which causes a reduction in workability.
JP 2002-243191 A

  The subject of this invention is providing the air conditioning apparatus with sufficient maintenance which made it easy to take out a motor and a fan from the front surface of a main body casing.

An air conditioner according to a first aspect of the present invention includes a double-shaft motor, a first fan, a second fan, and a casing. The dual- axis motor has a first shaft that protrudes horizontally in the right direction and a second shaft that protrudes horizontally in the left direction when viewed from the front side. The first fan and the second fan are arranged so as to sandwich the double-axis motor, and are rotated by the double-axis motor. The casing houses the double shaft motor, the first fan, and the second fan. The casing further includes a first installation table, a second installation table, a work opening, and a guide portion. A double shaft motor and a first fan are installed on the first installation base. The second installation table is separated from the first installation table, and the second fan is installed. The opening for work is used when the motors of both axes are pulled out to the front side to be removed or attached to the original position from the front side . The guide unit guides the first installation base toward the working opening.

  In this air conditioner, since the operator can pull out the first installation base to the working opening side by separating the second fan from the double-axis motor, the double-axis motor can be easily taken out. .

An air conditioner according to a second aspect is the air conditioner according to the first aspect, wherein the casing further has a working space. The working space is inside the casing and on the opposite side of the two-axis motor across the second fan , and the second fan is temporarily placed.

  In this air conditioner, when the operator separates the second fan from the both-axis motor, the second fan can be temporarily placed in the working space, so that the second fan can be removed from the casing. There is no need to provide an opening.

  An air conditioner according to a third aspect is the air conditioner according to the second aspect, wherein the second fan includes a second fan rotor and a second fan housing. The second fan rotor is connected to the biaxial motor. The second fan housing houses the second fan rotor. The second fan housing is fixed to the second installation base by bolts.

  In this air conditioner, since the operator can separate the second fan from the shafts of both shaft motors by simply removing the bolts of the second fan housing and sliding them to the working space, the workability is good. .

  An air conditioner according to a fourth aspect of the present invention is the air conditioner according to the third aspect of the present invention, wherein the bolts are removed and attached through the opening.

  In this air conditioner, the operator can perform the work of removing and attaching the second fan housing from the opening in the same manner as the work of removing and attaching the bolts, so that workability is good.

  An air conditioner according to a fifth aspect is the air conditioner according to the first aspect, further comprising a support plate. The support plate is fixed along with a bolt at the first installation base and moves along the guide portion. The operation of removing and attaching the bolt is performed from the opening.

  In this air conditioner, the operator can perform the work of removing and attaching the first installation base from the opening in the same manner as the work of removing and attaching the bolts, so that workability is good.

  In the air conditioner according to the first aspect of the present invention, the operator can pull out the first installation base to the working opening side by separating the second fan from the dual-axis motor. Becomes easier.

  In the air conditioner according to the second aspect of the present invention, when the operator separates the second fan from the both-axis motor, the second fan can be temporarily placed in the working space. There is no need to provide a separate opening for removal.

  In the air conditioner according to the third aspect of the present invention, the operator can separate the second fan from the shafts of both shaft motors simply by removing the bolt of the second fan housing and sliding it to the working space. Workability is good.

  In the air conditioner according to the fourth aspect of the invention, the operator can perform the work of removing and attaching the second fan housing from the opening in the same manner as the work of removing and attaching the bolts, so that workability is good.

  In the air conditioner according to the fifth aspect of the present invention, the operator can perform the work of removing and attaching the first installation base from the opening in the same manner as the work of removing and attaching the bolts.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<Configuration of air conditioner>
FIG. 1 is a refrigerant circuit diagram of an air-conditioning apparatus according to an embodiment of the present invention. In FIG. 1, the air conditioner 1 has an indoor unit 2 and an outdoor unit 3 connected to the indoor unit 2 via pipes 18a and 18b. The indoor unit 2 is installed in the computer room, and the outdoor unit 3 is installed outdoors. The air conditioner 1 forms two refrigerant circuits, a first refrigerant circuit 20a and a second refrigerant circuit 20b. Each of the first refrigerant circuit 20a and the second refrigerant circuit 20b has the same configuration, and the refrigerant circulating in these refrigerant circuits exchanges heat with the air in the computer room on the indoor unit 2 side. To absorb heat and to exchange heat with the outside air on the outdoor unit 3 side to dissipate heat.

  The indoor unit 2 includes a compressor 10, an evaporator 11, and indoor electric expansion valves 13 and 14, and constitutes a part of the refrigerant circuit. Further, the indoor unit 2 includes a double-axis motor 30, a first indoor fan 31, and a second indoor fan 32. The double-axis motor 30 rotates the first indoor fan 31 and the second indoor fan 32 to evaporate. An air flow is generated to exchange heat with the vessel 11.

  The outdoor unit 3 includes a condenser 12, an outdoor main electric valve 15, an outdoor bypass electric valve 16, and an outdoor electromagnetic on-off valve 17, and constitutes a part of the refrigerant circuit. Further, the outdoor unit 3 includes a first outdoor fan 51 and a second outdoor fan 52, and the first outdoor fan 51 and the second outdoor fan 52 generate an air flow that performs heat exchange with the condenser 12. . The control unit 6 controls the compressor 10, the indoor electric expansion valves 13 and 14, the outdoor main electric valve 15, the outdoor bypass electric valve 16, and the outdoor electromagnetic on-off valve 17.

  In the first refrigerant circuit 20a and the second refrigerant circuit 20b, the same compressor 10, evaporator 11, indoor electric expansion valves 13, 14, condenser 12, outdoor main electric valve 15, outdoor bypass electric valve 16, and outdoor Since the electromagnetic on-off valve 17 is used, the description will be given with the same name and reference sign except when either one is described. However, when the first refrigerant circuit 20a and the second refrigerant circuit 20b are described separately, for convenience, in the first refrigerant circuit 20a, the first compressor 10a, the first evaporator 11a, the first indoor electric expansion valve 13a, 14a, the first condenser 12a, the first outdoor main motor-operated valve 15a, the first outdoor bypass motor-operated valve 16a, and the first outdoor electromagnetic on-off valve 17a are given names and symbols, and in the second refrigerant circuit 20b, The compressor 10b, the second evaporator 11b, the second indoor electric expansion valves 13b and 14b, the second condenser 12b, the second outdoor main electric valve 15b, the second outdoor bypass electric valve 16b, and the second outdoor electromagnetic on-off valve 17b. Name and code are given as follows.

(Refrigerant circulation)
Below, the 1st refrigerant circuit 20a is mentioned as an example among the refrigerant | coolant circuits of 2 systems of the air conditioning apparatus 1, and a mode that a refrigerant | coolant circulates in the 1st refrigerant circuit 20a is demonstrated. In FIG. 1, the first compressor 10a on the indoor unit 2 side sucks the gas refrigerant, compresses it from the low pressure state to the high pressure state, discharges the high pressure gas refrigerant, and sends it to the outdoor unit 3 side. On the outdoor unit 3 side, the high-pressure gas refrigerant sent from the indoor unit 2 side is guided to the first condenser 12a, and is condensed by exchanging heat with the outside air in the first condenser 12a.

  At this time, an air flow is generated in the casing (not shown) of the outdoor unit 3 by driving the first outdoor fan 51, and heat exchange in the first condenser 12a is promoted.

  Further, the first refrigerant circuit 20a is connected to a hot gas bypass pipe for allowing the refrigerant discharged from the first compressor 10a to go to the first evaporator 11a without passing through the first condenser 12a. The first outdoor bypass electric valve 16a is provided in the middle of the hot gas bypass pipe, and the valve opening degree of the first outdoor bypass electric valve 16a is controlled during the low outside air operation.

  A pipe connected to the outlet of the first condenser 12a is provided with a first outdoor main electric valve 15a, which adjusts the amount of refrigerant from the first condenser 12a toward the first evaporator 11a. Furthermore, the 1st outdoor bypass piping 19a is connected in parallel with the 1st outdoor main electric valve 15a, and the 1st outdoor electromagnetic switching valve 17a is provided in the 1st outdoor bypass piping 19a.

  When the air conditioner 1 is operating, the first outdoor electromagnetic on-off valve 17a is always open. Therefore, when the first outdoor main motor-operated valve 15a is open, a part of the refrigerant discharged from the first condenser 12a passes through the first outdoor electromagnetic on-off valve 17a, and the rest passes through the first outdoor main motor-operated valve 15a. Pass through.

  The refrigerant that has passed through each of the first outdoor main electric valve 15a and the first outdoor electromagnetic on-off valve 17a merges, enters the first indoor electric expansion valves 13a and 14a, is reduced in pressure, and changes to a low pressure state. The liquid refrigerant in a low pressure state is guided to the first evaporator 11a, and evaporates by exchanging heat with the air in the computer room by the first evaporator 11a. At this time, an air flow is generated in the indoor unit 2 by the driving of the first indoor fan 31, and heat exchange in the first evaporator 11a is promoted. Thus, the refrigerant | coolant which became the low pressure gas state again is supplied to the suction pipe of the 1st compressor 10a.

<Structure of indoor unit 2>
FIG. 2 is a front view showing the inside center of the indoor unit 2, and FIG. 3 is a left side view showing the inside of the indoor unit 2. In FIGS. 2 and 3, parts other than the main parts are partially omitted for simplification of the drawings.

  The casing 40 of the indoor unit 2 has a substantially rectangular parallelepiped shape, and mainly includes a front plate 40a, a right side plate 40b, a left side plate 40c, a back plate 40d, a top plate 40e, and a bottom plate 40f. ing.

  The right side plate 40b is located on the right side of the front plate 40a when viewed from the front plate 40a side, and the left side plate 40c is located on the left side of the front plate 40a when viewed from the front plate 40a side. A large number of slits are formed in the top plate 40 e for sucking the air in the computer room into the casing 40.

  The space inside the casing 40 has a three-stage structure, and is divided into a space S1, a space S2, and a space S3 in order from the top. In the upper space S1, the evaporator 11, the drain pan 46, and the electrical component box 60 are arranged. A double shaft motor 30, a first indoor fan 31, and a second indoor fan 32 are disposed in the middle space S2. The compressor 10 is arranged in the lower space S3.

  By opening the front plate 40a, work openings for the operator to insert his / her hands into the spaces S1, S2 and S3 appear, and the worker can maintain various parts arranged in the casing 40. Work can be done.

<Configuration of main parts>
(Evaporator)
The evaporator 11 is a cross fin tube type heat exchanger, and has a substantially V shape when the indoor unit 2 is viewed from the left side plate 40c side. The V-shaped vertex of the evaporator 11 faces downward. The evaporator 11 is arrange | positioned at the back | inner side of the electrical component box 60 seeing from the front board 40a side, and has the same width as the front board 40a in the left-right direction.

(Drain pan)
The drain pan 46 is a plate-shaped water conduit made of sheet metal, collects drain water condensed on the surface of the evaporator 11, and guides it to a drain pipe 47 communicating with the outside of the casing 40. The drain pan 46 is disposed directly below the apex portion of the V-shape of the evaporator 11 and has approximately the same width as the evaporator 11 in the left-right direction when viewed from the front plate 40a side. Thereby, the drain pan 46 can receive the drain water falling from the surface of the evaporator 11.

(Both shaft motor, first indoor fan and second indoor fan)
When viewed from the front plate 40 a side, the first indoor fan 31 and the second indoor fan 32 are arranged so as to sandwich the double-axis motor 30, and the first indoor fan 31 is disposed on the right side of the double-axis motor 30. A second indoor fan 32 is disposed on the left side of the both-axis motor 30. The first indoor fan 31 and the second indoor fan 32 are both sirocco fans.

  When the first indoor fan 31 and the second indoor fan 32 are driven, the air sucked from the slit formed in the top plate 40e is heated between the refrigerant while passing through the cross-fin tube evaporator 11. Replace and cool. The cooled air is sucked into the first indoor fan 31 and the second indoor fan 32 and blown out right below.

  The air blown out directly from the first indoor fan 31 and the second indoor fan 32 flows under the floor through the air outlet formed in the bottom plate 40 f of the casing 40.

  4A is a cross-sectional plan view taken along line AA in FIG. 2, and FIG. 4B is a double-axis motor, a first indoor fan, and a second indoor room in FIG. 4A. It is the plane sectional view which moved the fan. In FIG. 4A, the first shaft 30 a protruding in the horizontal direction from the right side of the biaxial motor 30 when viewed from the front plate 40 a side is connected to the first fan rotor 31 a of the first indoor fan 31. The rotation of the first shaft 30a is transmitted to the first fan rotor 31a. Similarly, the second shaft 30b protruding in the horizontal direction from the left side of the double shaft motor 30 is connected to the second fan rotor 32a of the second indoor fan 32, and the rotation of the second shaft 30b is the second fan rotor. 32a.

(First installation base, guide member and support plate)
Both shaft motors 30 and first indoor fan 31 are fixed to a first installation base 41. The first installation base 41 is placed on a plurality of support plates provided at the boundary between the space S2 and the space S3. The plurality of support plates are, as viewed from the front plate 40a side, a right support plate 48a arranged at the lower right of the first installation table 41 and an intermediate support plate arranged near the center of the first installation table 41. 48b and a left support plate 48c disposed on the lower left side of the first installation base 41. For convenience of explanation, the right support plate 48a, the intermediate support plate 48b, and the left support plate 48c are collectively referred to as the support plate 48. Call it. The support plate 48 extends from the back plate 40 d side of the casing 40 toward the opening 43.

  The first installation base 41 is supported by two guide members on the left and right. These two guide members are composed of a right guide member 44a facing the right end face of the first installation base 41 and a left guide member 44b facing the left end face of the first installation base 41. For convenience of explanation, the right guide member 44a and the left guide member 44b are collectively referred to as a guide member 44. The guide member 44 extends from the back plate 40 d side of the casing 40 toward the opening 43.

  The first installation base 41 is normally fixed to the support plate 48 with bolts 91, but can be moved on the support plate 48 by removing the bolts 91. Therefore, when the operator pulls the first installation table 41, the first installation table 41 moves on the support plate 48 along the guide member 44 and is pulled out to the opening 43.

(Second installation base 42)
The second indoor fan 32 is fixed to the second installation base 42 with bolts 92. The second installation base 42 is fixed to the boundary between the space S2 and the space S3. Since there is a step surface 49 that protrudes upward from the space S2 in front of the second installation table 42 (on the front plate 40a side), the operator cannot pull out the second installation table 42 toward the opening 43 side. . However, since a working space 45 is provided on the left side of the second installation table 42 when viewed from the front plate 40a side, the operator removes the second indoor fan 32 from the second installation table 42 and temporarily installs it. Can be placed.

(Compressor)
The compressor 10 is a variable capacity inverter compressor whose rotation speed is controlled by the controller 6, and is disposed in front of the space S3 (on the front plate 40a side). An accessory device is attached above the compressor 10, and the height including the compressor 10 and the accessory device occupies the space S2 beyond the height of the space S3. As a result, a step surface 49 is formed in the space S2.

(Control part)
2 and 3, an electrical component box 60 is installed on the front plate 40a side of the space S1. The electrical component box 60 is a substantially rectangular parallelepiped box, and an electronic component and an electronic circuit constituting the control unit 6 are accommodated therein. FIG. 5 is a control block diagram of an air conditioner according to an embodiment of the present invention. In FIG. 5, the control unit 6 includes a microcomputer 62, a memory 63, a first inverter circuit 64, a second inverter circuit 65, A first drive circuit 66, a second drive circuit 67, a third drive circuit 68, and a relay circuit 69 are mounted.

  The control unit 6 drives the first compressor 10a and the second compressor 10b via the first inverter circuit 64 and the second inverter circuit 65. The control unit 6 drives the first indoor electric expansion valves 13a and 14a via the first drive circuit 66, drives the second indoor electric expansion valves 13b and 14b via the second drive circuit 67, and The first outdoor main electric valve 15a, the second outdoor main electric valve 15b, the first outdoor bypass electric valve 16a, and the second outdoor bypass electric valve 16b are driven via the three drive circuit 68. Further, the control unit 6 operates the first outdoor electromagnetic valve 17 a and the second outdoor electromagnetic valve 17 b via the relay circuit 69.

<Maintenance of double shaft motor, first indoor fan and second indoor fan>
2 and 4, when the operator replaces or repairs the double-shaft motor 30, the first indoor fan 31, and the second indoor fan 32, the operator removes the front plate 40a from the casing 40 and opens the opening 43 in the space S2. To expose. Note that the size of the opening 43 is substantially equal to the front surface of the space S2.

(Removal of double-axis motor, first indoor fan, and second indoor fan)
The operator releases the connection between the second shaft 30 b of the double shaft motor 30 and the second fan rotor 32 a of the second indoor fan 32. Then, the bolt 92 that fixes the second fan housing 32b of the second indoor fan 32 and the second installation base 42 is removed, the second indoor fan 32 is pushed into the working space 45, and the two-axis motor 30 starts to The two indoor fans 32 are separated.

  Next, the operator removes the bolt 91 that fixes the first installation base 41 and the support plate 48. After the bolt 91 is removed, the first installation table 41 is only placed on the support plate 48, and therefore the first installation table 41 can be moved to the opening 43 side. The operator pulls out the first installation base 41 along the guide member 44 toward the opening 43 side with both the shaft motor 30 and the first indoor fan 31 placed on the first installation base 41, and both The shaft motor 30 and the first indoor fan 31 can be removed.

  The second shaft 30b of the double-shaft motor 30 protrudes toward the second indoor fan 32. However, since the height of the second shaft 30b is higher than the height of the step surface 49, the first installation base 41 is installed. The second shaft 30b does not interfere with the stepped surface 49 when pulled out toward the opening 43 side.

  The operator removes the dual-axis motor 30 and the first indoor fan 31 from the first installation table 41, and then returns the first installation table 41 to the original position along the guide member 44. Then, the second indoor fan 32 is moved from the working space 45 to the first installation table 41, and the first installation table 41 is pulled out again toward the opening 43 side. Thereby, the second indoor fan 32 can be taken out of the casing 40.

(Attachment of double-axis motor, first indoor fan and second indoor fan)
After the maintenance is completed, the operator places the second indoor fan 32 on the first installation base 41 and returns the first installation base 41 to the original position. Then, the second indoor fan 32 is moved from the first installation table 41 to the work space 45 through the second installation table 42. Next, the operator pulls out the first installation base 41 toward the opening 43, and fixes the double-shaft motor 30 and the first indoor fan 31 on the first installation base 41. Then, the first installation table 41 is returned to the original position again, and the first installation table 41 is fixed to the support plate 48 with bolts 91. Then, the worker moves the second indoor fan 32 from the working space 45 to the second installation base 42, and connects the second fan rotor 32 a and the second shaft 30 b of the biaxial motor 30. Then, the second fan housing 32 b is fixed to the second installation base 42 with bolts 92. In this manner, the attachment of the double shaft motor 30, the first indoor fan 31, and the second indoor fan 32 is completed.

<Features>
(1)
In the air conditioner 1, the operator can pull out the first installation base 41 toward the opening 43 by separating the second indoor fan 32 from the double-shaft motor 30. Easy. In addition, when the operator separates the second indoor fan 32 from the double-shaft motor 30, the second indoor fan 32 can be temporarily placed in the working space 45. There is no need to provide a separate opening for removal from.

(2)
In the air conditioner 1, the operator releases the connection between the second shaft 30 b of the double shaft motor 30 and the second fan rotor 32 a, removes the bolt 92, and slides the second fan housing 32 b into the work space 45. Since the entire second indoor fan 32 can be separated from the shafts of the both-axis motors 30 by simply doing this, workability is good.

  The present invention makes it easy to take out the double-shaft motor, the first indoor fan, and the second indoor fan from the front surface of the casing. Therefore, the air conditioner in which the fan motor is often replaced, particularly the air conditioner used in a computer room. Useful for equipment.

The refrigerant circuit figure of the air conditioning apparatus which concerns on one Embodiment of this invention. The front view of the indoor unit of the air conditioning apparatus which concerns on one Embodiment of this invention. The left view of the indoor unit of the air conditioning apparatus which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional plan view taken along line AA in FIG. 2. The control block diagram of the air conditioning apparatus which concerns on one Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Air conditioner 30 Double shaft motor 31 1st indoor fan 32 2nd indoor fan 32a 2nd fan rotor 32b 2nd fan housing 40 Casing 41 1st installation stand 42 2nd installation stand 43 Opening 44 Guide part 45 Space 92 Bolt

Claims (5)

A double-axis motor (30) having a first shaft (30a) projecting horizontally in the right direction and a second shaft (30b) projecting horizontally in the left direction as viewed from the front side ;
A first fan (31) and a second fan (32) which are arranged so as to sandwich the double-axis motor (30) and are rotated by the double-axis motor (30);
A casing (40) for housing the double-axis motor (30), the first fan (31) and the second fan (32);
With
The casing (40)
A first installation base (41) on which the dual shaft motor (30) and the first fan (31) are installed;
A second installation table (42) separated from the first installation table (41) and installed with the second fan (32);
A work opening (43) for pulling out the double-axis motor (30) to the front side and removing it, or returning it from the front side to the original position and attaching it;
A guide portion (44) for guiding the first installation base (41) toward the opening (43);
Having
Air conditioner (1). The casing (40) is for working for temporarily placing the second fan (32) in the casing and on the opposite side of the biaxial motor (30) across the second fan (32). Space (45),
Further having
The air conditioner (1) according to claim 1. The second fan (32)
A second fan rotor (32a) connected to the double shaft motor (30);
A second fan housing (32b) for housing the second fan rotor (32a);
Have
The second fan housing (32b) is fixed to the second installation base (42) by a bolt (92).
The air conditioner (1) according to claim 2.   The operation of removing and attaching the bolt (92) is performed from the opening (43).
The air conditioner (1) according to claim 3.   The first installation base (41) is further fixed by a bolt (91), and further includes a support plate (48) that moves along the guide portion (44),
  The operation of removing and attaching the bolt (91) is performed from the opening (43).
The air conditioner (1) according to claim 1.

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