JPH0748015B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner in which a heater and a heater protection device are arranged on the leeward side of a heat exchanger (evaporator).

(B) Conventional Technology Conventionally, in this type of air conditioner, a heater and a blower were sequentially arranged on the leeward side of a heat exchanger as shown in Japanese Utility Model Publication No. 61-32262. In such an air conditioner, energization of the heater is stopped during the cooling operation, and the heat exchanger acts as an evaporator. Then, the air cooled by the evaporator by the rotation of the blower is blown out from the discharge port of the air conditioner via the blower while touching the heater. During the heating operation, the heat exchanger is caused to act as a condenser, or the air drawn into the air conditioner is heated by energizing the heater.

(C) Problem to be Solved by the Invention In such an air conditioner, particularly in the cooling operation, the air that is not sufficiently cooled by the evaporator and has a relatively low humidity is generated by a heater fuse, a thermostat, or the like. When the protective device was touched, dew could adhere to the protective device. When dew condensation occurs on the protective device in this manner, there is a risk that defective insulation of the device may occur.

SUMMARY OF THE INVENTION The present invention is intended to make it difficult for dew to adhere to a heater protection device arranged on the leeward side of an evaporator.

(D) Means for Solving the Problem In order to achieve this object, the present invention is configured so that the temperature of the windward side of the protection device is lower than the temperature of the windward side of the heater on the leeward side of the evaporator. Is.

(E) Action Since the temperature of the air passing through the protection device is lower than the temperature of the air passing through the heater, dew is less likely to adhere to this device.

(F) Embodiment In FIG. 1, reference numeral 1 is a main body of an integrated air conditioner, which is composed of a main body 1 and an exterior body (described later) into which the main body 1 is inserted. There is. Reference numeral 2 is a bottom plate, and a step portion 5 is formed so that the front portion 3 is higher than the rear portion 4 by one step.
Are formed. Reference numeral 6 denotes a partition plate that is erected on this bottom plate. The partition plate allows the bottom plate 2 to be on the inside 7 and outside 8 sides.
It is divided into and. Reference numeral 9 is a fan motor, 10 is a fixing plate of the fan motor, and a flange piece 12 of the fan motor 9 is fixed to one side surface 11 of the plate. And the leg of this fixing plate 10
13 is attached to the outdoor side surface of the partition plate 6. Reference numeral 14 is a reinforcing plate for the fixing plate 10, the details of which will be described later. Reference numeral 15 is one drive shaft of the fan motor 9, and a propeller fan 16 is fixed to the drive shaft 15. Reference numeral 17 is a slinger ring, and by the rotation of the propeller fan 16, drain water collected in the rear portion 4 of the bottom plate 2 is scooped up by the slinger ring 17 and scattered to the outdoor heat exchanger 18. Reference numeral 19 denotes a fan cover of the propeller fan 16, and both left and right pieces 20 thereof are fixed to the left and right tube plates 21 of the outdoor heat exchanger 18, respectively. Reference numeral 22 denotes an outdoor top plate, which is fixed to an upper edge 23 of the fan cover 19 and covers the outdoor heat exchanger 18. 24 is a sealing material, which is attached to the rear edge of the outdoor top plate 22.

Reference numeral 25 is an opening provided in the partition plate 6, and the other drive shaft 26 of the fan motor 9 is projected. 27 is a centrifugal fan attached to the drive shaft 26, 28 is a casing of the fan, and a suction port 29 is formed in the front part thereof, and a discharge port 30 is formed in the upper part thereof. Reference numeral 31 is a wire mesh covering the discharge port 30. And
The flange piece 32 of the fan casing 28 is the partition plate 6.
It is applied to the inner side surface 33 of the and is fixed to the partition plate 6 with a screw (not shown). Here, the size of the discharge port 30 of the fan casing 28 (that is, the width dimension a and the depth dimension b of the discharge port 30) is smaller than the size of the centrifugal fan 27 (that is, the diameter c and the depth dimension d of the centrifugal fan 27). The centrifugal fan 27 is set large so that it can be taken out from the discharge port 30.

Reference numeral 34 denotes a pipe cover, one end of which is fixed to an end 35 on the side opposite to the nose of the fan casing 28, and the other end of which is fixed to a left edge 36 of the partition plate 6.

A mounting plate 37 is mounted on the front portion of the fan casing 28 and has a bell mouth (suction port) 38 formed therein. 39
Is a mounting piece in which a part of the upper edge of the mounting plate is bent backward, and a mounting hole 40 is formed. And this mounting plate 37
Is lowered along the front surface of the fan casing 28,
The mounting hole 40 of the mounting piece 39 is inserted into the pin 41 on the upper surface of the fan casing 28. As a result, the mounting plate 37 is fixed to the front surface of the fan casing 28, and the bell mouth 38 faces the opening of the centrifugal fan 27. Therefore, when inspecting the service of the centrifugal fan 27, first, the mounting plate 37 is pulled out upward, and then the boss (not shown) of the centrifugal fan 27 is removed from the drive shaft 26 of the fan motor 9. And this centrifugal fan
After moving 27 a little to the front (indoor heat exchanger 42 side), the centrifugal fan 27 is pulled up from the discharge port 30 of the fan casing 28. In this way, service inspection of the centrifugal fan 27 can be easily performed.

A drain pan 43 made of styrofoam is placed on the front part 3 of the bottom plate 2, and a drain port 44 faces the outdoor side 8 from a lower cutout (not shown) of the partition plate 6. 45 is a heat shield plate laid on the rear part of this drain pan, and the rising piece 46 and the rear piece of this plate
47 covers the rising edge 48 of the drain pan 43.

49 is an aluminum tape, which is attached to the rising wall 50 at the corner of the drain pan 43. Therefore, a part of the radiant heat from the electric heater (not shown in FIG. 1) attached to the front surface of the partition plate 37 is blocked by the heat shield plate 45 and the aluminum tape 49, and is not easily transmitted to the drain pan 43 made of expanded polystyrene. , The drain pan 43 is made hard to be thermally deformed. The indoor heat exchanger 42 is placed on the drain pan 43. A refrigerant pipe connected to the indoor heat exchanger 42
57 passes through the periphery (left side) of the fan casing 28 and is inserted into the piping hole 58 of the partition plate 6. And this refrigerant pipe
A pipe cover 34 is arranged above 57. Reference numeral 51 denotes a blowing member arranged above the indoor heat exchanger 42, which is a vertical blade.
52 are lined up.

Reference numeral 53 is an indoor-side top plate fixed to the upper edge 54 of the partition plate 6, and a hooking piece (fixing portion) 55 is provided on the upper surface thereof, and the front panel 56 is locked to this hooking piece 55. To be done. Here, when performing service inspection of the indoor heat exchanger 42, a part of the refrigerant pipe is cut off inside the outdoor side 8 and the refrigerant pipe 57 extending from the indoor heat exchanger 42 is made straight. Next, the indoor side top plate 5
3. When the blowing member 51 and the pipe cover 34 are removed, the refrigerant pipe 57 penetrates through the pipe hole 58 of the partition plate 6 and the fan casing 28
It is located to the side of. Therefore, if the indoor heat exchanger 42 is pulled out upward and then this indoor heat exchanger 42 is pulled out obliquely forward, the indoor heat exchanger 42 can be taken out without removing the fan casing 28.

Reference numeral 59 is a flat metal fitting for connecting the upper edge 54 of the partition plate 6 and the outdoor side top plate 22. An electrical equipment box 60 is fixed to the inner side surface of the partition plate 6.

A compressor 61 is attached to the rear portion 4 of the bottom plate 2.
The front panel 56 is provided with a suction grill 62 at its lower portion and a discharge port 63 at its upper portion. Reference numeral 64 denotes a movable blade (hereinafter referred to as a “horizontal blade”) arranged at the discharge port 63. 202
Is an operation port provided on the side of the discharge port 63.

FIG. 2 is a perspective view showing the main body 1 in a state where such devices (excluding the front panel 56) are assembled. In FIG. 2, reference numeral 65 is an exterior body of the main body 1, and 200 is a polyethylene pad attached to the inside of the exterior body.
200 is located on the side of the compressor 61. Therefore, even if the compressor 61 abnormally vibrates due to a drop during transportation of the air conditioner, this vibration is restricted by the pad 200.
The main body 1 is shipped even with the exterior body 65 removed. In this case, a cover is attached to this unit instead of the exterior body 65. Then, a styrofoam pad is attached to the inside of this cover, and the pad regulates abnormal vibration of the compressor 61. Then, at the time of installation, this cover is removed together with the pad.

FIG. 3 is a vertical cross-sectional view of the air conditioner 66, showing the exterior body 65.
Is attached through the interior wall 67. Then, the main body 1 in the state shown in FIG. 2 is inserted into the exterior body 65 from the indoor side. Then, the lower part 68 of the front panel 56 is directed toward you as shown in FIG.
70 is engaged with the hooking piece 55, and the locking piece 71 of the lower portion 68 thereof is inserted into the receiving piece 72 of the bottom plate 2 and fixed. When the front panel 56 is attached in this way, the rear edge 73 of the front panel 56 is
The front edge of 65 and the front panel 56
Matches the surface of.

Now attach the protruding piece 70 of the front panel 56 to the rear edge of the front panel 56.
Place it inward of 73 and leave space around this trailing edge.
Forming 75. Since the space 75 is formed in this way, as shown in FIG. 5, another exterior body having a protrusion 76 on the front edge is provided.
When the main body 1 is inserted into 77 (existing exterior body) and the front panel 56 is engaged with the hooking piece 55, the protrusion 76 is located in the space 75 of the front panel 56. Then, the front panel 56 and the exterior body 77 are flush with each other. In other words, the front panel 56 should be attached to either the exterior body 77 having a protrusion on the front edge (see FIG. 5) or the exterior body 65 having no protrusion 76 on the front edge (see FIG. 3). You can

Reference numerals 78 and 79 denote heaters and fuses of the heaters, which are fixed to the mounting plate 37 via a support frame 201. The details will be described later. The indoor heat exchanger 42 functions as an evaporator, and the refrigerant flows as shown by the solid line arrow. That is, the low-temperature refrigerant decompressed by the decompressor (not shown) first flows into the upper leeward side pipe 80, and then the upper part 85 in the heat exchanger 42 flows in an inverted U shape to the upwind side pipe 81. Be guided. Flows from the top to the bottom in this leeward pipe, and at the lower part thereof, it is divided into two by the cheese 82 and leeward pipe.
83 and the inside of the intermediate pipe 84 flow in parallel, and after joining at the upper part, the upper part returns to the compressor. In this way, the low temperature refrigerant is first made to flow in an inverted U shape in the upper part 85 of the indoor heat exchanger 42, because the heat exchange rate in the upper part 85 is higher than the heat exchange rate in the lower part 86. Is. As a result, the air that has passed through the upper portion 85 of the indoor heat exchanger 42 is cooled and has a lower temperature than the air 86 that has passed through the lower portion. Therefore, the air whose temperature is kept low flows to the protective device (fuse) 79 of the heater 78, and it becomes difficult for dew to adhere to the protective device 79.

Therefore, insulation failure of this protection device 79 is less likely to occur,
If the heater is energized during heating operation, the heater 78
It is possible to prevent abnormal heating in advance.

The rear edge 87 of the blowing member 51 is formed in an inverted U shape, and the upper edge 88 of the mounting plate 37 is fitted to the rear edge 87 of the blowing member 51. In this way, the blowing member 51 allows the mounting plate 37
The upper edge 88 is fixed and the mounting plate 37 and the blowing member 51 are securely combined so that the wind discharged from the discharge port 30 of the fan casing 28 does not leak between the mounting plate 37 and the blowing member 51. I am trying.

Further, when the main body 1 is put into the exterior body 65, the sealing material 24 attached to the outdoor side top plate 22 approaches the rear edge 89 of the exterior body 65. In this way, the sealing material 24 is brought close to the trailing edge 89 of the exterior body 65 because the air discharged from the outdoor heat exchanger 21 enters the gap between the exterior body 65 and the outdoor top plate 22 as much as possible. This is to suppress it.

FIG. 6 is a perspective view showing the vicinity of the lower left part of the indoor heat exchanger. 90 is an auxiliary tool, which is formed in a substantially L-shaped cross section and has a screw
It is rotatably fixed to the front piece 92 of the partition plate 6 at 91. When the main body 1 is to be removed from the exterior body 65 at the time of service inspection, the auxiliary tool 90 is directed downward (in a one-dot chain line state). On the other hand, after inserting the main body 1 into the exterior body 65, the auxiliary tool 90 is made horizontal and the protruding piece 93 thereof is engaged with the front edge 94 of the exterior body 65. The main body 1 is prevented from being inadvertently pulled out from the exterior body 65. This is done by, for example, inserting the main body 1 into the exterior body 65 and then pushing the main body 1 from the outside to the inside of the main body 1 with the front panel 56 attached.
Falls into the room. This is because only the exterior body 65 remains, the wall is in a penetrating state through the exterior body 65, and it becomes unwarranted, which is not preferable for crime prevention.

FIG. 7 is a perspective view showing the lower portion 60 of the main body 1, 95 is a power cord extending from the electrical equipment box, 96 is a clamper for stopping the cord 95, and the front side 97 is fixed to the bottom plate 2. Therefore, the power cord 95 is pulled from the rear side 98 to the front side 97 and engaged with the clamper 96. When the main body 1 is inserted into the exterior body 65 (see FIG. 3), the front edge 74 of the exterior body 65 is located below the clamper 96. Therefore, when the power cord 95 is pulled from the rear side 98 of the clamper 96 toward the front side 97 to engage with this clamper 96 and the main body 1 is inserted into the exterior body 65, the power cord 95 is carelessly pulled (front panel 56 side). ), The clamper 96 is prevented from being deformed by the front edge 74 of the exterior body 65.
Therefore, there is no possibility that the power cord 95 will come off the clamper 96. Here, since the power cord 95 is pulled out from the cutout (not shown) in the lower portion of the front panel 56, even if the power cord 95 is pulled forward, there is no risk of the front panel 56 coming off.

FIG. 8 is a perspective view showing the relationship between the horizontal blades 64 arranged at the discharge port 63 and the display frame 99 attached to the operation port 65.
Each of the horizontal blades 64 is formed by bending a single plate of metal, and a space 100 is provided inside thereof. Reference numeral 101 denotes a left support made of synthetic resin, which is inserted into the space 100 of each horizontal blade 64 (see FIG. 9). A left shaft (one shaft) 102 is inserted into the left side support hole 103 of the discharge port 63. 104 is an interlocking axis,
The notch 106 of the interlocking plate 105 fits. Reference numeral 107 denotes a right support made of synthetic resin, which is inserted into the space 100 of each horizontal blade 64. The right shaft (the other shaft) 108 is formed in a tubular shape.
The outer diameter of the right shaft 118 is set smaller than the inner diameter of the right support hole 109 of the discharge port 63. 110 is a pushing tool,
The protruding pin 111 is formed. And this pushing tool 110
The left side 112 of the operation port 202, press the protruding pin
111 is the protruding pin via the right side support hole 109 of the discharge port 63.
The tip of 111 is inserted into the right shaft 108 of the right support 107. As a result, the horizontal blade 64 is rotatably supported within the outlet 63.

In this way, the right shaft 108 of the right support 107 is connected to the right side surface of the outlet 63.
Since it is configured to be supported by the projecting pin 111 of the pressing tool 110 against the 203, the support holes 10 are provided on the left and right side walls of the discharge port 63, respectively.
3,109 is formed, which is enough. Therefore, the side wall of the air outlet 63 looks good, turbulent flow is reduced near the side wall, and it is easy to suppress the dew around the air outlet 63 when cold air is blown from the air outlet 63. .

Reference numeral 99 is a display frame fitted in the operation port 202, and a protrusion 113 is formed on the left side surface thereof, an engagement piece 114 is formed on the upper piece, and a fixed piece 115 is formed on the lower piece. Then, while fitting the engaging piece 114 into the protrusion 210 (see FIG. 10) on the upper back side of the front panel 56,
The fixing piece 115 is fixed to the lower rear side of the front panel 56 with a screw. Here, the distance x between the engagement pieces 114 is equal to the distance between the protrusions 210. Therefore, with the engagement piece 114 of the display frame 99 fitted in the protrusion 210, the display frame 99 is attached to the front panel 5.
It is located at the operation port 65 of 6. Then, by fixing the fixing piece 115 to the lower back side of the front panel 56 with a screw, the projection 113 hits the pressing tool 110 and prevents the pressing tool 110 from coming off.

FIG. 11 is a sectional view showing the relationship between the partition plate 6, the fan motor 9, the fixing plate 10 of the fan motor, and the reinforcing plate 14.
6 is a cushion rubber provided between the fan motor 9 and the opening 25 of the partition plate 6. And the lower end 117 of the reinforcing plate 14
Is fixed to the bottom plate and the upper end 118 is fixed to the fixed plate 10.
In this way, since the partition plate 6 to which the fan motor 9 is attached and the bottom plate 2 are connected by the reinforcing plate 14, the vibration when the fan motor 9 rotates is received by the partition plate 6 and the bottom plate 2, and the partition plate The vibration of the fan motor 9 is prevented from being transmitted to 6 only. As a result, the vibration of the partition plate 6 can be reduced, and the partition plate 6 can be thinned. Particularly, the partition plate 6 is a relatively large member for partitioning the bottom plate 2 into the indoor side 7 and the outdoor side 8, and the cost of the partition plate 6 can be reduced by reducing the thickness of the partition plate 6. Can be planned.

12 and 13 show a centrifugal fan 27 and a fan casing 28.
In the front view showing the relationship with and the characteristic diagram of air volume-rotation speed,
The diameter e of this centrifugal fan 27 is 180 mm, and its center 119
Is the dimension f to the right of the center 120 of the fan casing 28 (10 m
There is a deviation of g dimension (7 mm) on m). In this way, since the centrifugal fan 27 was brought close to the nose portion 121 of the fan casing 28 in the fan casing, the dimension h of the gap between the nose portion 121 and the centrifugal fan 27 was about 11 mm.
(The centrifugal fan 122 is installed at the center 120 of the fan casing 28.
Nose 121 and centrifugal fan 1 when the centers of the two are aligned
The size of the gap with 21 is about 20 mm). In FIG. 13, the center 119 of the centrifugal fan 27 and the center 120 of the fan casing 28 are shown.
Centrifugal fan 27 when it is shifted (Example of the present invention)
The solid line shows the relationship between the rotation speed and the air volume of the centrifugal fan 122 when the center 120 of the centrifugal fan 122 and the center 120 of the fan casing 28 are matched (broken line in FIG. 12). The relationship with is shown by the broken line. According to this, when the center 119 of the centrifugal fan 27 and the center 120 of the fan casing 28 are displaced (solid line), the center is 0.25 × 100 cm ^{3 at the} same rotation speed as compared with the case where the centers of both are aligned (dashed line). The air volume increased. When the center 119 of the centrifugal blower 27 and the center 120 of the fan casing 28 are displaced from each other, the nose portion 1
It is considered that the gap dimension h between the fan 21 and the centrifugal blower 27 becomes small, and as a result, the air blown out from the discharge port 30 of the fan casing 28 becomes difficult to be sucked into this gap.

FIG. 14 is a plan view showing the relationship between the rear grill 123 of the air conditioner 66 and the unit 1, where 124 is a suction bar connected to the suction port, 125 is a discharge bar located behind the outdoor heat exchanger 18, In particular, both ends 126 close to the suction bar 124 are inwardly inclined by an angle θ.
It is inclined at (45 ° ± 2 °). Since it is inclined in this way, the outdoor air discharged from both ends 126 of the discharge bar 125 flows as indicated by the solid line arrow, and the air short circuit that the discharge air is sucked into the air conditioner 66 through the suction bar 124 is minimized. To prevent.

In FIG. 15, 127 is a heater member fixed to the front surface of the mounting plate 37, and this member is a support frame 20 fixed to the mounting plate 37.
1 and a heater 78 arranged in a meandering shape on the support frame 201. 128 is a thermostat and this heater 7
It is one of the eight protection devices. The heater 78 and the support frame 201 are supported at their intersections. Particularly, the central piece 129 of the support frame 201 prevents the heater 78 from sagging. Further, the upper portion 130 of the central piece 129 is bent to the right side (in FIG. 15), and this upper portion 130 is also used as the fixing portion 131 at one end of the fuse 79 of the heater 78. In other words, the central piece 129 provided to prevent the slack of the heater 78.
Since the upper part 130 of the is also used as the fixing part of the fuse 79, it was bent to the right side.
There is no central piece 129 near the upper part 132 in the center of 38
The ventilation resistance of 132 has decreased. As a result, the decrease in the intake air volume was suppressed to a small level.

(G) Effect of the Invention As described above, according to the present invention, on the leeward side of the evaporator, the temperature on the windward side of the protective device is set lower than the temperature on the windward side of the heater. It becomes difficult to adhere and the occurrence of insulation failure of this device can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an integrated air conditioner showing an embodiment of the present invention, FIG. 2 is a perspective view with the front panel of the air conditioner removed, and FIG. 3 is a vertical cross-sectional view of the air conditioner. Is an explanatory view showing a mounting state of a front panel of the aircraft, FIG. 5 is a longitudinal sectional view of a main part showing a different mounting state of the front panel, and FIG. 6 is a diagram showing a relationship between an exterior body of the aircraft and an auxiliary tool. FIG. 7 is a perspective view of a main part, FIG. 7 is a bottom perspective view of the machine showing a mounting state of a power cord of the machine, FIG. 8 is an exploded perspective view of a discharge port of the machine, and FIG.
FIG. 10 is an enlarged view of a main part of the figure, FIG. 10 is a perspective view showing a part of the back surface of the front panel, FIG. 11 is a cross-sectional view of the main part showing the mounting state of the fan motor of this air conditioner, and FIG. FIG. 13 is an explanatory view showing the relationship between the centrifugal fan and the casing, FIG. 13 is a characteristic diagram showing the relationship between the rotational speed of the centrifugal fan of the machine and the discharge air volume,
FIG. 14 is a sectional view of a rear grill of the aircraft, and FIG. 15 is an elevation view of a heater member attached to the aircraft. 27 ... Blower, 42 ... Indoor heat exchanger, 78 ... Heater, 79, 128 ...
Protective device.

Claims (1)

[Claims] 1. An air conditioner provided with a blower, an evaporator, a heater arranged on the leeward side of the evaporator, and a protection device for the heater, wherein a windward part of the protection device for the evaporator is provided. Is lower than the temperature of the windward portion of the heater.