JP3554384B2 - Indoor unit of air conditioner - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an indoor unit of an air conditioner having a dehumidifying function.
[0002]
[Prior art]
A heat exchange cycle that comfortably air-conditions a room is required to have a dehumidification function that keeps only the relative humidity low without lowering the room temperature. In such a case, the dehumidification includes a throttle mechanism that throttles the flow of the refrigerant in the middle of the refrigerant pipe that is passed through the indoor heat exchanger of the indoor unit, and a bypass mechanism that flows the refrigerant without passing through the throttle mechanism. A function switching means is provided. This switching means is usually arranged on the front side of the indoor heat exchanger.
[0003]
In the indoor heat exchanger, a portion upstream of the switching means functions as a condenser, and a downstream portion can selectively function as an evaporator or a condenser by switching operation of the switching means. It has become. In other words, if the refrigerant flows through the throttle mechanism and is vaporized, the downstream portion functions as an evaporator so that dehumidification can be performed. If the refrigerant flows without passing through the throttle mechanism, it functions as a condenser similarly to the upstream side. Can be done.
[0004]
By the way, when the throttling mechanism of the switching means is operated for dehumidification, it is inevitable that drain adheres to components constituting the throttling mechanism and refrigerant pipes near the components. The above components are simply arranged on the front side of the indoor heat exchanger together with the refrigerant tubes.
[0005]
Therefore, the part floats up from the front side of the indoor heat exchanger and easily comes into contact with the air purifying filter arranged together with the part on the front side, so that the drain attached to the part travels through the filter and passes through the indoor unit main body. In some cases, it dripped outside.
[0006]
In addition, a part of the drain does not pass through the heat exchanger, but drops directly from the above-mentioned components and pipes to a drain pan disposed opposite to the lower end of the indoor heat exchanger. Drain directly dropped onto the drain pan from the above-mentioned parts and pipes has a large drop, so it may scatter around and drop outside the indoor unit main body.
[0007]
Further, when the refrigerant is caused to flow through the switching means, in particular, the throttle mechanism, the flow may be disturbed on the upstream side, and the flow noise may be easily generated. Therefore, conventionally, vibration absorption rubber has been attached to the surface of the refrigerant pipe near the throttle mechanism to absorb noise.
[0008]
However, silencing using anti-vibration rubber only blocks noise from radiating from the surface of the refrigerant pipe, so the silencing effect may be low, making it difficult to mitigate it effectively. there were.
[0009]
Also, in order to selectively flow the refrigerant to either the throttle mechanism or the bypass mechanism, an electromagnetic two-way valve is used for the bypass mechanism, and the flow direction of the refrigerant is controlled by opening and closing the two-way valve. That is done. For this reason, there is a case where noise is unavoidable during the opening / closing operation.
[0010]
[Problems to be solved by the invention]
As described above, in the conventional indoor unit having the dehumidifying function, the component that constitutes the dehumidifying function switching means provided on the front side of the indoor heat exchanger and the drain attached to the refrigerant pipe to which the component is connected are described above. It may drop along the filter placed on the front side of the indoor heat exchanger to the outside of the indoor unit, or may fall directly from the above parts to the drain pan to scatter around and drop outside the indoor unit. Was.
[0011]
In addition, noise may easily occur when the refrigerant flows through the switching means, and when an electric two-way valve is used for the switching means, noise may be generated during the opening / closing operation.
[0013]
The purpose of this invention is to provide a indoor unit of an air conditioner noise disturbed flow of the refrigerant is to be able to efficiently prevent the occurrence.
[0014]
[Means for Solving the Problems]
The invention described in claim 1 for solving the above-mentioned problem is provided in an indoor unit of an air conditioner having a dehumidifying function,
The body of the indoor unit,
An indoor heat exchanger having a fin and a refrigerant tube passed through the fin, and disposed in the main body;
Switching means for a dehumidifying function having a throttle mechanism provided in the middle of the refrigerant pipe and a mechanism for restricting the flow of the refrigerant flowing through the refrigerant pipe and a mechanism for flowing the refrigerant without passing through the restriction mechanism;
A silencer in which a plurality of nets having different mesh sizes are provided in the refrigerant pipe on the upstream side of the throttle mechanism and arranged inside from the upstream to the downstream in the refrigerant flow direction in order of the size of the mesh. And a container .
[0015]
The invention described in claim 2 is an indoor unit of an air conditioner having a dehumidifying function,
The body of the indoor unit,
An indoor heat exchanger having a fin and a refrigerant tube passed through the fin, and disposed in the main body;
Switching means for a dehumidifying function having a throttle mechanism provided in the middle of the refrigerant pipe and a mechanism for restricting the flow of the refrigerant flowing through the refrigerant pipe and a mechanism for flowing the refrigerant without passing through the restriction mechanism;
A silencer arranged on the upstream side of the throttle mechanism of the refrigerant pipe and having a plurality of porous members having different hole diameters arranged from the upstream to the downstream in the flow direction of the refrigerant in the order of the size of the hole diameter. <br/>.
[0028]
[Action]
According to the present invention, it is possible to reduce noise generated by the silencer provided at the inlet side portion of the throttle mechanism of the refrigerant pipe .
[0029]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an indoor unit 1 of the air conditioner, and the indoor unit 1 has a main body 2. An upper surface suction port 4a provided with a grill 3 and a front surface suction port 4b are formed on the upper surface and the front surface of the main body 2, respectively, and an air outlet 5 is formed on the lower surface.
[0030]
An indoor heat exchanger 6 is provided in the main body 2. The indoor heat exchanger 6 is formed by bending an upper heat exchanger section 6A and a lower heat exchanger section 6B into a C-shape, and the upper heat exchanger section 6A is inclined at a predetermined angle to form the upper surface suction port. The lower heat exchanger 6B faces the front suction port 4b in a substantially vertical state.
[0031]
A drain pan 7 is provided at the lower end of the lower heat exchanger section 6B, and a blower 8 is provided on the inner side of the indoor heat exchanger 6. When the blower 8 is operated, as shown by arrows in FIG. 2, room air is sucked from the upper surface suction port 4a and the front face suction port 4b, and the upper part of the indoor heat exchanger 6 facing each suction port, The lower heat exchangers 6A and 6B exchange heat with each other, and are blown into the room from the outlet 5.
[0032]
Each of the heat exchanger portions 6A and 6B of the indoor heat exchanger 6 is formed by laminating fins 11 made of aluminum and penetrating the fins 11 through a refrigerant pipe 12 in a meandering manner. The refrigerant pipes 12 passed through the upper heat exchanger section 6A and the lower heat exchanger section 6B communicate with each other, and a middle part of the refrigerant pipe 12 is led out.
[0033]
As shown in FIG. 1, an intermediate portion led out of the refrigerant pipe 12 forms an outflow portion 12a and an inflow portion 12b, and the outflow portion 12a and the inflow portion 12b are provided with a dehumidifying function switching unit 15 described later. Connected as much as possible.
[0034]
A supply pipe 21 that forms an indoor heat exchange cycle is connected via a first connector 22 to one end of the upper heat exchanger section 6A of the indoor heat exchanger 6 on the inlet side of the refrigerant pipe 12. The outflow portion 12a, which is the other end of the refrigerant pipe 12 of the upper heat exchanger portion 6A, is connected to the inflow side of the switching portion 15 via a second connector 23. The outflow side of the switching unit 15 is connected to the inflow unit 12b via a third connector 24.
[0035]
The inflow section 12b is connected to an end of the refrigerant pipe 12 of the upper heat exchanger section 6A, and the other end of the refrigerant pipe 12 meanders through the lower heat exchanger section 6B and is led out to the outside. 25 is connected to a return pipe 26 forming an indoor heat exchange cycle.
[0036]
The switching unit 15 has a bypass pipe 31 having one end connected to the second connector 23 and the other end connected to the third connector 24 to form a bypass circuit of a bypass mechanism. An electric two-way valve 32 is provided in the middle of the bypass pipe 31.
[0037]
A main pipe 33 forming a throttle mechanism is branched from a portion of the bypass pipe 31 closer to the second connector 23 than the two-way valve 32, and a buffer tank 34 is provided at an intermediate portion of the main pipe 33 along the flow direction of the refrigerant. A silencer 35 and a capillary tube 36 are sequentially provided, and are connected to a portion of the bypass pipe 31 closer to the third connector 24 than the two-way valve 32. Therefore, the refrigerant flowing from the outflow portion 12a to the switching portion 15 via the second connector 23 flows through the bypass pipe 31 to return to the inflow portion 12b if the two-way valve 32 is open, and When the direction valve 32 is closed, the flow returns from the main pipe 33 to the inflow portion 12b through the capillary tube 36.
[0038]
During the dehumidifying operation, the refrigerant is supplied from the supply pipe 21 to the refrigerant pipe 12 of the upper heat exchanger 6A, and the two-way valve 32 is closed. Thereby, the refrigerant is condensed and liquefied in the upper heat exchanger section 6A, and the refrigerant is evaporated and vaporized through the capillary tube 36 in the lower heat exchanger section 6B.
[0039]
Therefore, the indoor air is heated by the upper heat exchanger 6A and is cooled and dehumidified by the lower heat exchanger 6B. As a result, part of the indoor air sucked into the indoor unit 1 is heated, the rest is dehumidified, and these are mixed and blown out, so that the relative humidity decreases without lowering the temperature. That is, the upper heat exchanger 6A functions as a heater, and the lower heat exchanger 6B functions as a cooler.
[0040]
A long filter frame 41 is provided on the outer surface (upper surface) of the upper heat exchanger section 6A along its longitudinal direction. As shown in FIGS. 3 to 5, the filter frame 41 has a first housing portion 42 and a second housing portion 43 integrally formed side by side.
[0041]
The first accommodating portion 42 has a rectangular frame portion 44a, and a pair of grooves 44b is formed on the lower surface at both ends in the longitudinal direction. The portion is detachably inserted and held.
[0042]
The lower surface of the second housing portion 43 is open, the upper surface portion where the switching portion 15 is installed is covered by a dome-shaped upper wall, and the lower surface faces the outer surface of the upper heat exchanger portion 6A. I have.
[0043]
One longitudinal side wall of a portion forming the dome-shaped upper wall of the second storage portion 43 forms a partition portion 46 for separating the second storage portion 43 from the first storage portion 42. The other side wall forms a holding portion 47 whose length is shorter than one side wall.
[0044]
Further, as shown in FIG. 5, one side of the upper heat exchanger section 6A of the second storage section 43 which is located at the lower end side in the direction of inclination is configured such that the drain generated in the second storage section 43 drops to the outside. And a drain guide portion 48 for guiding the upper heat exchanger portion 6A in the direction of the fins 11.
[0045]
As a result, the drain generated in the second storage portion 43 is transmitted from the drain guide portion 48 to the fins 11 of the upper heat exchanger portion 6A and the fins 11 of the lower heat exchanger portion 6B, and drops to the drain pan 7. That is, dripping from the switching unit 15 directly to the drain pan 7 is prevented.
[0046]
As shown in FIGS. 3 and 5, the switching section 15 is housed in the dome-shaped upper wall forming portion of the second housing section 43 of the filter frame 41. Then, the ends of the outflow pipe 12a and the inflow pipe 12b connected to the bypass pipe 31 are engaged with a concave portion 74a formed in the holding section 47 and pressed and held. As a result, it is restricted that the switching section 15, especially the two-way valve 32, rises from the outer surface of the upper heat exchanger section 6A.
[0047]
Further, since the first accommodating section 42 and the second accommodating section 43 are separated by the partition section 46, the bypass pipe 31 and the two-way valve 32 of the switching section 15 accommodated in the second accommodating section 43 are provided. Can be prevented from adhering to the filter 45 held in the first accommodating portion 42. As a result, it is possible to prevent the drain generated in the switching unit 15 from dropping to the outside of the main body 1 through the filter 45.
[0048]
The two-way valve 32 is opened and closed by a control circuit 51 shown in FIG. The control circuit 51 includes a rectifier 53 connected to an AC power supply 52, and a rectifier circuit 55 including a first capacitor 54 connected to an output side of the rectifier 53. A time constant circuit 56 is connected to the output side of the rectifier circuit 55. The time constant circuit 56 includes a pair of resistors 57 connected in series and a second capacitor 58 connected in parallel to one resistor.
[0049]
A photocoupler 59 is provided between the one resistor 57 and the second capacitor 58. The photocoupler 59 includes a phototransistor 61 and a light emitting diode 62. The light emitting diode 62 has one end to which a DC voltage is applied and the other end connected to a control transistor 64 via a resistor 63. A control signal from a control device 65 is applied to the base of the control transistor 64. As a result, a current flows through the light emitting diode 62 to emit light, so that the phototransistor 61 is turned on.
[0050]
On the output side of the rectifier circuit 55, a driving coil 32A, a driving transistor 66, and a resistor 67 of the two-way valve 32 connected in series are connected in parallel with the pair of resistors 57. A diode 69 for preventing back electromotive force is connected in parallel to the coil 32A.
[0051]
The base of the driving transistor 66 is connected to the second capacitor 58 and the phototransistor 61 via a resistor 70. When the phototransistor 61 is rendered conductive, the electric charge flowing therethrough is applied to the base of the driving transistor 66 while being stored in the second capacitor 58.
[0052]
As a result, the driving transistor 66 becomes conductive, so that current flows through the coil 32A, and the two-way valve 32 operates in the opening direction. The current flowing through the coil 32A is proportional to the voltage applied to the base of the driving transistor 66. The voltage applied to this base is a current flowing through the phototransistor 61, and a part of the charge is applied to the base while being stored in the second capacitor 58. The two-way valve 32 is configured so that the valve is elastically held in the closing direction by a coil spring.
[0053]
Therefore, the voltage applied to the base of the driving transistor 66 gradually increases, and the current flowing through the coil 32A is proportional to the increase, so that the two-way valve 32 resists the elastic holding force of the spring. The opening operation is gradually performed.
[0054]
When the control signal from the control device 65 is stopped to close the two-way valve 32, no current flows to the phototransistor 61, but the current is stored in the second capacitor 58 at the base of the driving transistor 66. A voltage corresponding to the applied charge is applied, and the voltage gradually decreases. Therefore, the closing operation of the two-way valve 32 is performed gradually as the elastic holding force of the spring increases.
[0055]
As described above, since the opening and closing operation of the two-way valve 32 is performed gently, it is possible to reduce generation of noise during the operation.
The muffler 35 has a hollow housing 71 as shown in FIG. Both ends of the housing 71 are narrowed to a small diameter, and a plurality of sound deadening plates, in this embodiment, three sound deadening plates 72 are provided at predetermined intervals via a ring-shaped spacer 73 in a central portion. Stacked and housed. As shown in FIG. 8 (a), three nets 72a to 72c such as a wire mesh are arranged in the order of larger meshes as shown in FIG. 8 (b), three porous plates 74a to 74c having different hole diameters are arranged from upstream to downstream in the flow direction of the refrigerant in the order of larger hole diameter as shown in FIG. Any of the configurations arranged sequentially.
[0056]
By arranging three nets 72a to 72c or porous plates 74a to 74c having different meshes or hole diameters, the respective nets 72a to 72c or the porous plates 74a as shown by curves A to C in FIG. The frequency ν at which 74c attenuates is different. In other words, the frequency that can be effectively attenuated increases as the size of the mesh or the hole diameter decreases, so that the three muffling plates 72 are sequentially stacked and arranged in the order of the size of the mesh or the hole diameter, so that a broken line is formed as a whole. As a result, vibrations in a wide frequency band can be efficiently attenuated as shown by a curve X.
[0057]
According to the indoor unit 1 of the air conditioner configured as described above, when performing the dehumidifying operation, the upper heat exchanger 6A of the indoor heat exchanger 6 is supplied from the supply pipe 21 as shown by an arrow in FIG. The refrigerant is supplied to the refrigerant pipe 12 and condensed. Since the temperature of the condensed refrigerant is high, a part of the room air circulated by the blower 8 is heated.
[0058]
The condensed and liquefied refrigerant flows from the upper heat exchanger section 6A to the switching section 15. During the dehumidifying operation, the two-way valve 32 provided in the middle of the bypass pipe 31 is closed. Therefore, the liquid refrigerant flowing to the switching section 15 flows from the main pipe 33 to the capillary tube 36 via the buffer tank 34 and the muffler 35, and is located downstream of the refrigerant pipe 12 of the upper heat exchanger section 6A of the indoor heat exchanger 6. To the lower heat exchanger 6B, where it is evaporated to cool and dehumidify part of the room air circulated by the blower 8. The room air cooled and dehumidified in the lower heat exchanger 6B is mixed with the room air heated in the upper heat exchanger 6A and blown out from the outlet 5. Therefore, a dehumidifying operation in which only the relative humidity is kept low without lowering the temperature of the indoor air can be performed.
[0059]
By performing the dehumidifying operation, drain adheres to components such as the main pipe 33, the capillary tube 36, the bypass pipe 31, and the two-way valve 32 of the switching unit 15. However, the switching section 15 is housed in a second housing section 43 in which the lower surface of the filter frame 41 is open. The second storage section 43 is separated from the first storage section 42 holding the filter 45 by a partition section 46.
[0060]
Therefore, the drain adhering to the above-mentioned constituent parts adheres to the filter 45 provided in the first accommodating portion 42 adjacent to the second accommodating portion 43 and drops to the outside of the main body 2, and the fins of the heat exchanger 6 There is no drip directly onto the drain pan 7 or the bottom of the main body 2 without spilling over the drain pan 11 and scattered outside.
[0061]
That is, a part of the drain attached to the component is transmitted from the guide part 48 which is a part of the second housing part 43 to the fins 11 of the upper heat exchanger part 6A and the fins 11 of the lower heat exchanger part 6B. Since the water flows from a sufficiently low position to the drain pan 7, it is possible to prevent the drain from dropping from the upper part inside the main body 2 to the lower part as described above, and to scatter outside the indoor unit main body 2.
[0062]
Further, a holding portion 47 is provided in the second accommodation portion 43, and the holding portion 47 presses and holds the ends of the outflow pipe 12a and the inflow pipe 12b. For this reason, since the components of the switching unit 15 do not easily rise from the outer surface of the upper heat exchanger unit 6A, a part of the drain adhered to the components is also removed by the drain pan 7 through the fins 11 of the upper heat exchanger unit 6A. To be easily guided.
[0063]
The opening and closing operation of the two-way valve 32 is performed by the control circuit 51. The control circuit 51 gradually opens and closes the two-way valve 32 with a predetermined time constant. That is, the two-way valve 32 is not opened and closed instantaneously. Therefore, noise is hardly generated from the two-way valve 32 during opening and closing.
[0064]
A silencer 35 is provided upstream of the capillary tube 36 of the switching section 15. The silencer 35 has a plurality of silencers 72 stacked therein. Therefore, the noise generated by the disturbance of the flow before the liquid refrigerant flows into the capillary tube 36 is absorbed and diverged by the sound deadening plate 72 and is attenuated.
[0065]
Moreover, as the sound deadening plate 72, a plurality of meshes 72a to 72c having different meshes or a plurality of porous plates 74a to 74c having different hole diameters are arranged along the flow direction of the refrigerant in the order of larger mesh or hole diameter. Accordingly, noise generated by the flow of the refrigerant can be attenuated over a wide frequency band. That is, the noise reduction effect can be enhanced.
[0066]
The present invention is not limited to the above embodiment, and can be variously modified without departing from the gist thereof. For example, instead of the two-way valve and the capillary tube, the switching unit may use an electric expansion valve that can switch between the open state and the throttle state with one.
[0067]
Further, the indoor heat exchanger is divided into an upper heat exchanger section and a lower heat exchanger section. However, a configuration in which a switching section is provided in the middle of the refrigerant pipe in one heat exchanger may be used.
[0075]
【The invention's effect】
According to the present invention, since a plurality of meshes having different meshes or a plurality of porous members having different hole diameters are stacked and accommodated inside the silencer, vibrations of a wide range of frequencies can be attenuated. Alternatively, by arranging the porous members in the order of the size of the mesh or the pore diameter, noise can be efficiently eliminated by these.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an indoor heat exchanger according to one embodiment of the present invention and switching means provided therein.
FIG. 2 is a longitudinal sectional view of the indoor unit.
FIG. 3 is a perspective view of the indoor heat exchanger.
FIG. 4 is a front view of the filter frame.
FIG. 5 is an enlarged sectional view taken along the line ZZ in FIG. 4;
FIG. 6 is a control circuit diagram of the two-way valve.
FIG. 7 is a sectional view of the silencer.
FIG. 8A is a perspective view of a state in which a net is used for a sound deadening plate, and FIG. 8B is a perspective view of a state in which a porous member is also used.
FIG. 9 is a graph showing the sound deadening effect of a plurality of sound deadening plates.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Indoor unit, 2 ... Main body, 6 ... Indoor heat exchanger, 6A ... Upper heat exchanger part, 6B ... Lower heat exchanger part, 11 ... Fin, 12 ... Refrigerant pipe, 31 ... Bypass pipe, 32 ... Two directions Valve, 36: Capillary tube, 41: Filter frame, 42: First accommodating section, 43: Second accommodating section, 45: Filter, 46: Partitioning section, 47: Holding section, 48: Drain guide Department.

Claims (2)

In an indoor unit of an air conditioner having a dehumidifying function,
The body of the indoor unit,
An indoor heat exchanger having a fin and a refrigerant tube passed through the fin, and disposed in the main body;
Switching means for a dehumidifying function having a throttle mechanism provided in the middle of the refrigerant pipe and a mechanism for restricting the flow of the refrigerant flowing through the refrigerant pipe and a mechanism for flowing the refrigerant without passing through the restriction mechanism;
A silencer in which a plurality of nets having different mesh sizes are provided in the refrigerant pipe on the upstream side of the throttle mechanism and arranged inside from the upstream to the downstream in the refrigerant flow direction in order of the size of the mesh. indoor unit of an air conditioner which is characterized by comprising a vessel and <br/>. In an indoor unit of an air conditioner having a dehumidifying function,
The body of the indoor unit,
An indoor heat exchanger having a fin and a refrigerant tube passed through the fin, and disposed in the main body;
Switching means for a dehumidifying function having a throttle mechanism provided in the middle of the refrigerant pipe and a mechanism for restricting the flow of the refrigerant flowing through the refrigerant pipe and a mechanism for flowing the refrigerant without passing through the restriction mechanism;
A silencer arranged on the upstream side of the throttle mechanism of the refrigerant pipe and having a plurality of porous members having different hole diameters arranged from the upstream to the downstream in the flow direction of the refrigerant in the order of the size of the hole diameter. An indoor unit for an air conditioner, comprising:

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