JP6119613B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher, and more particularly to a device that reduces noise generated during a washing process or a rinsing process of a dishwasher.

  A conventional dishwasher having a washing function, a rinsing function, or a drying function usually has a washing tub accommodated inside a dishwasher casing. The cleaning tank is provided with an exhaust port for allowing the vaporized water inside the cleaning tank to pass through, and the exhaust port communicates with an external exhaust port via an exhaust duct. As a result, after washing and rinsing, the moisture remaining on the washing tub and tableware evaporates by flowing dry air and is discharged from the exhaust port through the exhaust duct to the external exhaust port. ing.

  In the washing process, the washing water stored in the washing tank provided in the dishwasher (dissolved in water) is heated by a water heater (may not be heated). In addition, pressure is applied by a pressure pump, and sprayed from the nozzle toward the dishes in the washing tank. The sprayed wash water removes dishes. In the washing process, the above-described cycle is continuously performed, so that the dishes can be cleaned.

  The rinsing process is different from the cleaning process in that water containing no detergent is used instead of the cleaning water. In other words, the water sent into the washing tank provided in the dishwasher is heated by a water heater or the like (may not be heated), and further pressurized by a pressure pump, Sprayed from the nozzle toward the dishes in the washing tank. The sprayed water drops the wash water that remains attached to the dishes. In the rinsing process, it is possible to rinse the dishes by continuously performing the above cycle.

  In the drying process, for example, a fan is used to take dry air into the cleaning tank in order to remove moisture remaining in the cleaning tank and tableware during the cleaning process or the rinsing process. The taken-in dry air absorbs moisture from the dishes and the washing tank, and is released from the exhaust port as wet air. Thereby, tableware is dried.

  In a conventional dishwasher, in order to discharge wet air during the drying process, the exhaust port provided in the cleaning tank and the external exhaust port communicate with each other via an exhaust duct, and are always open during operation. It has become. As a result, the cleaning water or water sprayed from the nozzle during the cleaning process or the rinsing process enters the inner surface of the exhaust duct from the inlet portion in the liquid state, and collides with the inner surface of the exhaust duct to generate a collision sound. I was letting.

  In addition, the cleaning water or water sprayed from the nozzle during the cleaning process or the rinsing process collides with at least the dishes and the wall surface of the cleaning tank to generate a collision noise, and this collision sound is provided in the cleaning tank. It was leaked from the external exhaust port through the exhaust duct from the exhaust port. As a result, noise was generated from the dishwasher.

  Therefore, as a means for reducing the above-mentioned collision noise, it has a main body exhaust port for discharging wet air to the outside of the main body, the inside of the door is made into an exhaust duct, and the wet air from the washing tank is provided at the lower part of the exhaust duct to the exhaust duct. It has been proposed that an exhaust port for feeding is provided, and the exhaust port is closed by a cleaning water or a rinsing water during a cleaning process or a rinsing process (see Patent Document 1).

  The dishwasher described in Patent Document 1 has a main body exhaust port for discharging wet air to the outside of the main body on the front surface of the door, and uses the space inside the door as an exhaust duct. An exhaust port for sending wet air from the cleaning tank to the exhaust duct is provided below the exhaust duct. The main body exhaust port and the exhaust duct form an exhaust path at the exhaust port below the exhaust duct.

  The exhaust port at the lower portion of the exhaust duct is provided at a position lower than the level of water supplied into the cleaning tank during the cleaning process or the rinsing process. As a result, at the time of the cleaning process or the rinsing process with the highest noise value, the exhaust port at the lower part of the exhaust duct communicating with the exhaust duct is blocked by water, and the noise generated in the cleaning tank is hardly leaked out of the main body.

Japanese Patent Laid-Open No. 2-128742 (FIG. 1)

  However, in the conventional dishwasher, the exhaust port is blocked by water during the washing process or the rinsing process, so that noise generated in the washing tank is hardly leaked out of the main body, but is heated by a water heater or the like. When the water becomes steam and becomes humid air, and the pressure in the cleaning tank increases, the humid air cannot be discharged from the exhaust port. It will enter the dry air passage.

  Electrical components such as a drying heater and drying fan are provided upstream in the drying air passage, and wet air reaches these electrical components, exposing them to a humid environment that causes condensation. There was a risk that the electrical components would be short-circuited or failed.

  The present invention has been made to solve the above-described problems, and reduces noise leaking from the exhaust port to the outside of the main body during the washing process or the rinsing process of the dishwasher, while the drying heater and the drying machine are used. The aim is to improve noise performance and reliability by not exposing the blower to a humid environment.

  A dishwasher according to the present invention that solves the problem is provided in a main body, a cleaning tank for storing tableware, a water supply valve for supplying water for cleaning or rinsing into the cleaning tank, and a lower part of the cleaning tank A heating element for heating the washing water or the rinsing water, a pressure pump for pressurizing the washing water or the rinsing water, an injection nozzle for injecting the washing water or the rinsing water into the dishes stored in the washing tank, A drying unit provided at the rear of the cleaning tank, which is composed of a drying fan that supplies air to the cleaning tank and a drying heater that heats the air, and is formed at the upper front of the cleaning tank to clean wet air in the cleaning tank A cleaning tank exhaust port that leads to the outside of the tank, an exhaust duct through which the humid air led from the cleaning tank exhaust port circulates, and communicates with the cleaning tank exhaust port via the exhaust duct to exhaust the humid air outside the main body. External exhaust and cleaning tank A muffler duct installed in the cleaning tank so as to cover the mouth, and the muffled air is provided between the inner surface and the muffler duct in a state of being close to or in close contact with the inner surface of the cleaning tank. The first inlet and the second inlet are formed so that the first inlet can be blocked by the cleaning water or the rinsing water stored in the cleaning tank during the cleaning process or the rinsing process. The second inflow port is formed at an upper position away from the first inflow port so as not to be blocked by the washing water or the rinsing water stored in the washing tank during the washing step or the rinsing step. is there.

  According to the dishwasher according to the present invention, the first inlet of the exhaust duct is closed with the washing water or the rinsing water stored during the washing process or the rinsing process. Noise that sometimes leaks from the exhaust port to the outside of the main body can be reduced, and user discomfort can be suppressed.

In addition, wet air can be sent to the exhaust duct from the second inlet formed at an upper position away from the first inlet so as not to be blocked by the washing water or the rinse water. Since the blower is not exposed to a humid environment that causes dew condensation, it is possible to prevent the drying heater or the drying blower from being short-circuited or broken, and to improve the reliability of the dishwasher.

It is sectional drawing seen from the right side which shows schematic structure of the dishwasher which concerns on Embodiment 1 of this invention. It is a front view of the dishwasher which concerns on Embodiment 1 of this invention. It is a figure which shows the state which pulled the door part located in the front of sectional drawing shown in FIG. 1 in the front direction. It is the perspective view which looked at the sound deadening duct of the tableware washing machine concerning Embodiment 1 of the present invention from the washing tub side. It is the model top view which looked at the inside of the washing tank of the tableware washing machine which concerns on Embodiment 1 of this invention from upper direction. It is the schematic cross section which looked at the BB cross section shown in FIG. 5 from the left side. It is the perspective view which looked at the noise reduction duct of the dishwasher which concerns on Embodiment 2 of this invention from the exhaust duct inner side. It is sectional drawing which cut | disconnected the silencer duct of the dishwasher which concerns on Embodiment 2 of this invention in the location which passes along a 2nd inflow port and a rib, and was seen from the upper side. It is the perspective view which looked at the noise reduction duct of the dishwasher concerning Embodiment 3 of this invention from the exhaust duct inner side.

Embodiment 1 FIG.
(Overall configuration)
1 is a cross-sectional view seen from the right side showing a schematic configuration of a dishwasher according to Embodiment 1 of the present invention, and FIG. 2 is a front view of the dishwasher according to Embodiment 1 of the present invention. . A schematic configuration of the dishwasher according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the dishwasher 1 according to the first embodiment includes at least a casing 2 that is an outer shell of the dishwasher 1 and a cleaning that houses the tableware 91 placed in the tableware basket 6. A tank 3 (a box body whose upper surface is open), a lid 4 provided on the upper surface of the cleaning tank 3 to open and close the opening of the cleaning tank 3, and a housing 2 mounted in front of the cleaning tank 3 And a door part 5 that opens and closes when the washing tub 3 is taken out, and a silencer duct 15 that reduces the noise generated during the cleaning process or the rinsing process and discharges the humid air generated during the drying process. ing.

  The casing 2 is a member that is an outline of the dishwasher 1 having a substantially rectangular parallelepiped shape, and includes at least a cleaning tank 3 that stores the dishes 91 to be cleaned therein, and an exhaust unit that discharges wet air in the cleaning tank 3. 41 and a control device 9 for controlling the dishwasher 1 are provided inside.

In addition, in FIG. 1, the door part 5 is drawn so that it may be seen as a component of the housing | casing 2 in the obstruct | occluded state. In the first embodiment, the door unit 5 will be described as a component of the housing 2.

  As shown in FIG. 1, the cleaning tank 3 has a substantially box shape having a concave portion 3 a in which at least a part of the bottom surface portion protrudes vertically downward. A water level detection device 11a for detecting the water level of the cleaning water or the rinsing water stored in the cleaning tank 3, and the cleaning water or A water temperature detector 11b for detecting the temperature of the rinse water, a water heater 12 for heating the wash water or the rinse water, and a pressure pump pipe 13a connected to the pressure pump 13 capable of pressurizing the wash water or the rinse water. And are attached.

  The pressurizing pump 13 is provided outside the cleaning tank 3, and is connected to a pressurizing pump pipe 13b provided vertically upward. The pressurizing pump pipe 13 b is connected to an injection nozzle 14 having an injection port 14 a for injecting cleaning water or rinsing water flowing from the pressurizing pump 13 into the cleaning tank 3.

That is, one end of the pressurizing pump pipe 13 b is connected to the pressurizing pump 13 and thus is outside the cleaning tank 3, and the other end penetrates the bottom surface of the cleaning tank 3 and the injection nozzle 14 in the cleaning tank 3. It is connected. The drain pump 16 is provided outside the cleaning tank 3 similarly to the pressurizing pump 13, and is connected to a drain pipe 13 c that drains cleaning water or rinsing water stored in the cleaning tank 3. The drainage pipe 13c is connected to at least one side surface of the recess 3a of the cleaning tank 3, and the recess 3a of the cleaning tank 3, the drainage pipe 13c, and the drainage pump 16 communicate with each other.

  A drying unit 21 for generating warm air is attached to the rear of the cleaning tank 3. The drying unit 21 includes a drying blower 22 for supplying air to the cleaning tank 3, a drying heater 23 for heating the air, and a casing 24 incorporating them.

The casing 24 is formed with a blowing opening 24 a for the drying blower 22 to take air into the casing 24. And the washing tank ventilation opening 3b which the warm air required for drying of the tableware 91 vents is formed in either side of the washing tank 3 of the tableware washing machine 1, and the washing tank 3 and the drying unit 21 are Communicate. Thus, the drying unit 21 can send warm air into the cleaning tank 3.

  As shown in FIG. 2, a door portion 5 is provided on the front surface of the dishwasher 1. The door unit 5 is provided with an operation unit 7 composed of switches for operating the dishwasher 1. The operation unit 7 is provided with an operation switch 8.

  A cleaning tank exhaust port 3 c is formed in the upper part on the front side of the cleaning tank 3, while an external exhaust port 5 a is formed in the upper part of the door portion 5. An exhaust unit 41 is attached between the cleaning tank exhaust port 3c and the external exhaust port 5a. That is, the cleaning tank exhaust port 3c, the exhaust unit 41, and the external exhaust port 5a are configured to communicate with each other.

  FIG. 3 is a view showing a state in which the door portion located in front of the cross-sectional view shown in FIG. 1 is pulled in the front direction. The door portion 5 can be pulled out toward the user as viewed from the user. When the door portion 5 is pulled out, at least the door portion 5, the exhaust unit 41, and the cleaning tank 3 (attached to the cleaning tank 3). The drying unit 21 is also drawn out at the same time.

  The exhaust unit 41 includes a shutter 43 that is opened by wet air discharged from the cleaning tank 3 during the drying process, and an exhaust duct 44 that incorporates the shutter 43. In addition, each surface of the exhaust duct 44 is configured such that all surfaces are inclined vertically downward in order to easily return water generated by condensation to the cleaning tank 3.

Finally, the condensed water travels along each surface of the exhaust duct 44, reaches the cleaning tank exhaust port 3c, and is returned to the cleaning tank 3.

Note that both ends of the exhaust unit 41 are respectively attached to the inner wall side of the external exhaust port 5 a and the outer wall of the cleaning tank 3. And regarding the attachment, in order to ensure the airtightness between the washing tank 3 and the exhaust unit 41 and between the exhaust unit and the external exhaust port 5a, the packing 50 is provided.

  One end of a link mechanism (not shown) is attached to the lid body 4. The other end of the link mechanism is attached to the upper part of the inner surface of the housing 2. By this link mechanism, the lid body 4 is lifted when the washing tank 3 is pulled out, and the washing tank 3 can be opened.

Thereby, when the washing tank 3 is drawn out, it is not drawn out together with the washing tank 3. On the other hand, when the cleaning tank 3 is pushed in, the lid 4 is lowered by this link mechanism so that the cleaning tank 3 can be closed.

  FIG. 4 is a perspective view of the muffler duct of the tableware washing machine according to Embodiment 1 of the present invention as seen from the washing tub side. The silencer duct 15 is attached to the cleaning tank so as to cover the above-described cleaning tank exhaust port 3c.

  At the lower end of the muffler duct 15, there is provided a first inflow port 15a for guiding wet air generated in the cleaning tank 3 to the cleaning tank exhaust port 3c. The washing tank 3 and the muffler duct 15 are configured to be ventilated through the first inlet 15a during the drying process.

The first inlet 15a is adapted to ventilate the washing tank 3 and the muffler duct 15 during the drying process, but the first inlet 15a is washed in the washing tank 3 during the washing process or the rinsing process. It is provided at a position lower than the water or rinse water level.

Therefore, at the time of a washing | cleaning process or a rinse process, the 1st inflow port 15a is obstruct | occluded with washing water or a rinsing water, and it will be in the state which does not ventilate the washing tank 3 and the muffler duct 15 by the 1st inflow port 15a.

Further, the side wall of the muffler duct 15 is provided with a second inflow port 15b. The second inlet 15b is located above the first inlet 15a formed at the lower end, in other words, from the level of the washing water or rinsing water stored in the washing tank 3 during the washing process or the rinsing process. Is also formed at a high position.

Therefore, at the time of the washing process or the rinsing process, the second inlet 15b is not blocked by the washing water or the rinsing water, and the washing tank 3 and the muffler duct 15 can be vented by the second inlet 15b. It has become.

Then, the muffler duct 15 is fixed to a screw fixing boss 18 provided in the exhaust duct 44 of the cleaning tank 3 with a screw 19 inserted from the inside of the cleaning tank 3. That is, the screw 19 passes through the side surface of the cleaning tank 3 and reaches the screw fixing boss 18 provided in the exhaust duct 44.

Further, the screw 19 does not penetrate the screw fixing boss 18. If the screw 19 penetrates the screw fixing boss 18, there is a risk of water leaking from the surface of the penetrating portion, but it is avoided that water leaks because it does not penetrate. In the above example, the screw fixing boss 18 is provided in the cleaning tank 3 and fixed with the screw 19 from the inside of the cleaning tank 3. However, the same applies to other systems such as the sound deadening duct 15 directly welded to the cleaning tank 3. Therefore, it is not limited to fixing with screws.

  In the first embodiment, the muffler duct 15 is attached to the washing tub 3 as shown in FIG. 4, and the upper part has a linear shape in the vertical downward direction. From the position to the lower end, the breadth (the horizontal direction is defined as the horizontal direction when the dishwasher 1 is placed on the horizontal floor) is expanded in a substantially box shape. It has the advantage of being shaped and thereby less likely to interfere with tableware installed in the tableware basket.

For example, when the width of the muffler duct 15 is wide from the upper part to the lower part, the internal volume of the cleaning tank 3 is reduced, and there is a possibility that the number of dishes 91 that can be cleaned at a time may be reduced. Therefore, the score of the tableware 91 does not decrease.

  The silencer duct 15 has a structure in which a surface attached to the cleaning tank 3 and a bottom surface (a surface in contact with the bottom surface of the cleaning tank 3) are opened. That is, the muffler duct 15 is configured by a top surface and a side wall, and is installed in a state of being close to or in close contact with the surface attached inside the cleaning tank, and the open attached surface is the inner surface of the cleaning tank 3. It is closed and has a box shape with an open lower end, and the lower end opening is a first inflow port 15a.

Since the surface of the silencer duct 15 attached to the cleaning tank 3 can be closed by the inner surface of the cleaning tank 3 by being attached to the cleaning tank 3, it is not necessary to form a side wall in the silencer duct 15, and the material cost for that amount. Can be suppressed.

Further, as shown in FIG. 4, the members constituting the top surface of the silencer duct 15 are attached to the silencer duct by providing an inclination in a direction from the surface attached to the cleaning tank 3 toward the bottom surface of the cleaning tank 3. The washed water or rinsing water is easy to flow to the bottom surface of the washing tank 3, and the drying residue can be reduced during the drying process.

Here, the structure of the muffler duct 15 is assumed to be open on the surface attached to the cleaning tank 3 in consideration of suppressing the material cost. However, if the material cost is not considered, it is attached to the cleaning tank 3. A side wall may be provided on the surface, and the silencer duct 15 alone may be formed in a box shape.

(Operation)
Next, the operation in the case of cleaning and drying dishes with the dishwasher 1 according to the first embodiment will be described. First, as shown in FIG. 3, the door portion 5 is pulled to the front side, the washing tub 3 is pulled out, and the tableware 91 to be cleaned and dried in the tableware basket 6 is stored in the tableware basket 6. A detergent (not shown) is put in and the door part 5 is closed.

Next, the operation switch 8 provided in the operation unit 7 is pressed to start the operation of the device. The operation is controlled by the control device 9, and each functional component is operated in accordance with the command, and the cleaning process, the rinsing process, the heating rinsing process, and the drying process are performed in this order.

  When the cleaning process is started, first, the water supply valve 10 is opened to supply water into the cleaning tank 3. At this time, the water level in the cleaning tank 3 is detected by the water level detection device 11a, and when it is detected that the water level has reached the predetermined water level 17a, the control device 9 transmits a signal so as to close the water supply valve 10. To do.

Next, the water heater 12 is energized to heat cleaning water in which a detergent (not shown) is mixed with the stored water, and the pressure pump 13 is energized to apply pressure to the cleaning water and use the injection nozzle 14. Washing water is sprayed on the tableware 91.

The cleaning is performed while circulating the stored cleaning water. The cleaning water that has dropped to the bottom of the cleaning tank 3 is collected, pressure is applied again by the pressurizing pump 13, and the tableware 91 is applied using the spray nozzle 14. It repeats spraying washing water. The injection nozzle 14 is provided with an injection port 14a for injecting cleaning water.

Then, the water level 17b in the cleaning tank 3 being cleaned is lower than the predetermined water level 17a. This is because during the cleaning, the cleaning water is sprayed from the spray port 14a of the nozzle 14 and is reduced by the amount scattered in the cleaning tank 3 and the amount adhering to the tableware.

Further, the water level 17b in the cleaning tank 3 being cleaned is set to be lower than the injection port 14a of the nozzle 14. This is because if the water level 17b in the cleaning tank 3 is higher than the injection port 14a of the nozzle 14, the cleaning water is prevented from being jetted.

The washing is performed while heating the washing water with the water heater 12 as described above, and the temperature of the washing water is usually set to a temperature that can maximize the ability of the enzyme contained in the detergent. It is set to about 60 ° C. The washing water temperature is monitored by the water temperature detection device 11b, and when detecting that the temperature has reached a predetermined temperature, energization of the water heater 12 is stopped.

  When the cleaning process is started and a predetermined time has elapsed, the energization of the water heater 12 and the pressure pump 13 is stopped and the drainage pump 16 is energized to drain the cleaning water stored in the cleaning tank 3 to the outside. . Thereby, the cleaning process is completed.

  When the cleaning process is completed, the rinsing process is started. The basic operation is almost the same as the cleaning process. First, the water supply valve 10 is opened to supply water into the cleaning tank 3, and the water level detection device 11a. Is detected to reach the predetermined water level 17a, and the water supply valve 10 is closed.

Next, the pressurizing pump 13 is operated, and the rinsing water is injected with pressure from the injection port 14 a provided in the injection nozzle 14. The sprayed rinsing water is sprayed on the dishes 91, and rinse water and fine dirt remaining on the dishes 91 are rinsed.

And when predetermined time passes, while stopping energization of pressurization pump 13, drainage pump 16 is operated, and rinse water stored in washing tub 3 is drained outside. Such a rinsing process is repeated several times. In this rinsing step, the rinsing water is not heated by the water heater 12.

Next, the heating and rinsing process is started. The basic operation is the same as that of the washing process or the rinsing process, except that the rinsing water by the water heater 12 is heated in the rinsing process described above.

The temperature of the rinsing water is usually higher than the temperature of the rinsing water in order to improve the drying performance by increasing the temperature of the tableware 91, and generally 70 It is set to be equal to or higher than 75 ° C. (75 ° C. or higher for O-157 measures).

  When the washing and rinsing steps are completed, the drying step, which is the last step, is started. First, the drying fan 22 is energized, pressure is applied to the air, and the drying heater 23 is energized. The suction port of the drying fan is formed in the gap between the door portion 5 on the upstream side of the exhaust duct 44 or the door portion 5 and the cleaning tank 3.

The outside air that has entered through the suction port cools the outer wall of the control device 9, the exhaust duct 44 and the cleaning tank 3, enters the inlet of the drying fan 22, heats the air by the drying heater 23, and converts it into warm air. It sprays on the tableware 91 from the washing tank ventilation opening 3b.

Subsequently, the warm air sent from the tank blower port 3b passes through the inside of the cleaning tank 3, and passes through the silencer duct from the first inlet 15a and the second inlet 15b formed in the silencer duct 15. Then, the air enters the exhaust duct 44 from the cleaning tank exhaust port 3c, the shutter 43 is opened by the force of the warm air, and is discharged out of the dishwasher 1 from the external exhaust port 5a.

  Next, the effect of the silencer duct will be described in detail. As described above, the muffler duct 15 is provided so as to cover the cleaning tank exhaust port 3 c of the cleaning tank 3. The muffler duct 15 has a box shape, and has a first inflow port 15 a for discharging wet air generated in the cleaning tank 3 at the lower end.

As described above, the first inflow port 15a is provided at a position lower than the surface of the cleaning water or the rinsing water stored in the cleaning tank 3 during the cleaning process or the rinsing process. It is blocked by washing water or rinsing water during the rinsing process.

  Since the first inflow port 15a is completely blocked by the cleaning water or the rinsing water during the cleaning process or the rinsing process, the noise generated in the cleaning tank 3 during the cleaning process or the rinsing process is It becomes difficult to leak from the external exhaust port 5a through the silencer duct from 15a.

The first inflow port 15a can be made relatively large as long as it has a size that can be blocked by the washing water or the rinsing water, and the larger the size, the more difficult the dirt removed from the tableware 91 during the washing process. That is, by enlarging the first inflow port 15a, it is possible to prevent a problem that dirt is clogged during drying and the cleaning tank 3 cannot be dried normally.

The reason why noise leakage is suppressed not only by the washing tank 3 and the muffler duct 15 but also by the water surface will be described. Sound is physically regarded as energy, and sound is propagated by vibrating the medium material and attenuated by the energy consumed by the vibration of the medium material.

In particular, since air and water have different densities, resistance for transmitting sound, that is, specific acoustic impedance is different. The specific acoustic impedance is obtained by the following equation.
p (density: kg / m ³ ) × v (sound velocity: m / s) = ρc (intrinsic acoustic impedance)
It is known that the specific acoustic impedance varies depending on the substance, and in particular, the liquid (cleaning water or rinsing water in the first embodiment) is larger than the gas (humid air in the first embodiment).

For example, the numerical values of the specific acoustic impedance of air and water at 50 ° C. are shown below.
(Example) Air at 50 ° C .: 1.093 (kg / m ³ )
Water at 50 ° C .: 0.988 × 1000 (kg / m ³ ) → about 1000 times that of air.
This indicates that the sound energy in the air is less likely to enter the water due to a difference of about 1000 times in the specific acoustic impedance at the interface between the gas and the liquid.

Therefore, most of the collision sound of the cleaning water generated in the cleaning chamber can be reduced in energy by the silencer duct 15 before it is transmitted into the exhaust duct 44, so that it is greatly possible that the noise of these collision sounds leaks to the outside. It is suppressed.

The first inflow port 15a can be made relatively large as long as it is closed with washing water as described above, and the larger the inlet 15a, the more difficult it is to be blocked by water droplets, dirt, etc. The drying capacity is not reduced.

By the way, when only the 1st inlet 15a is provided in the muffling duct 15, if the 1st inlet 15a is obstruct | occluded, the moist air which lost the escape space will be the only opening left in the washing tank 3. The drying unit 21 behind the washing tank 3 having a ventilation opening 24a is flooded, and the drying heater 23 and the drying fan 22 in the path are directly exposed to a humid environment that causes condensation. It will end up.

The drying heater 23 and the drying blower 22 have few things that can withstand a humid environment that may cause a short circuit in the electrical current-carrying part and cause condensation, and environmental considerations that prevent the electrical current-carrying part from condensing are necessary. It is.

For this reason, it is necessary to discharge a certain amount of moist air through the cleaning tank exhaust port 3c so that the humid environment inside the cleaning tank 3 is set to an environment where the drying heater 23 and the drying fan 22 are not condensed. The duct 15 is provided with a second inflow port 15b at a position not blocked by the cleaning water or the rinsing water stored in the cleaning tank 3 during the cleaning process or the rinsing process.

The second inflow port 15b is always open even in a state where cleaning water or rinsing water is stored, so noise does not leak at all. However, most of the noise leaking from the cleaning tank exhaust port 3c is washed. Since it is a collision sound of cleaning water or rinsing water sprayed from the injection port 14a provided in the injection nozzle 14 that directly hits the periphery of the tank exhaust port 3c, it is provided so as to cover the cleaning tank exhaust port 3c of the cleaning tank 3. Is suppressed by the silencer duct 15.

Further, as shown in FIGS. 5 and 6, the second inflow port 15b is provided on the side wall on the side where the washing water or the rinsing water injected from the injection port 14a provided in the injection nozzle 14 is not directly applied. Therefore, a collision sound that strikes directly around the second inlet 15b does not occur.

More specifically, at the time of the cleaning process or the rinsing process, the spray nozzle 14 rotates at a substantially constant rotational speed in the direction of arrow A shown in FIG. Since the injection nozzle 14 rotates while injecting cleaning water or rinsing water into the tableware 91 and the cleaning tank 3 from the injection port 14a, the side wall on the side where the second inlet 15b of the muffler duct 15 is not provided. The cleaning water or the rinsing water is periodically sprayed to the surface facing the front side of the cleaning tank 3 (the side where the cleaning tank exhaust port 3c is provided) during the cleaning process or the rinsing process.

However, as shown in FIG. 5, the injection nozzle 14 rotates in the direction of the arrow A, and the second inlet 15b is directly subjected to washing water or rinsing water injected from the injection port 14a provided in the injection nozzle 14. The cleaning water or the rinsing water does not directly hit the periphery of the second inlet 15b.

Therefore, since the collision sound that directly hits the vicinity of the second inlet 15b does not occur, there is no problem that the collision noise that leaks from the cleaning tank opening 3c is increased by providing the second inlet 15b.

Further, as shown in FIG. 5, the side wall of the muffler duct 15 on the side where the second inflow port 15 b is provided does not have a wide space with the side wall of the cleaning tank 3. The impact sound of water or rinsing water does not resonate much.

Then, the size of the second inflow port 15b only needs to be large enough to allow the drying heater 23 and the drying blower 22 to vent so as not to dew, and can be made smaller than the cleaning tank opening 3c. The noise composed of most of the collision sound can be suppressed by blocking the first inflow port 15a with washing water or rinsing water.

  As described above, according to the dishwasher according to the first embodiment of the present invention, the noise reduction duct 15 is provided in the dishwasher 1, so that the dishwasher 1 is generated in the washing tank 3 during the washing process or the rinsing process. The sound energy is attenuated in a space surrounded by the washing tank 3, the muffler duct 15, and the washing water or the rinsing water surface. That is, since the propagation of sound is suppressed in the muffler duct 15, noise leaking from the cleaning tank opening 3c can be reduced, and the user's kitchen environment can be improved.

Further, the size of the first inlet 15a provided at the lower end of the muffler duct 15 may be below the surface of the cleaning water or the rinsing water stored in the cleaning tank 3, and is larger than the size of the dirt. It is easy to use one inlet 15a, and it is possible to avoid clogging the first inlet 15a. As a result, the flow of wet air that is vented during the drying process is less likely to be hindered, and it is possible to suppress a decrease in the drying capacity in the cleaning tank 3 during the drying process.

Furthermore, since the silencer 15 is provided with the second inlet 15b, it is possible to prevent the drying heater and the drying blower from being exposed to a humid environment that causes dew condensation, thereby improving reliability.

Embodiment 2. FIG.
FIG. 7 is a perspective view of the silencer duct 15 of the dishwasher 1 according to Embodiment 2 of the present invention, and FIG. 8 shows the silencer duct of the dishwasher according to Embodiment 2 of the present invention as a second inlet. It is sectional drawing seen from the upper side cut | disconnected in the location which passes a rib. The second embodiment is the same as the first embodiment of the present invention except for the silencer duct. Here, the description of the same parts as those of the first embodiment is omitted, and different parts from the first embodiment will be described.

  As shown in FIG. 7, a second inlet 15 b is provided on the side wall of the muffler duct 15. The second inflow port 15b is provided at a position that is not blocked by the cleaning water or the rinsing water stored in the cleaning tank 3 during the cleaning process or the rinsing process.

  A flat rib 60 is provided on the inner side of the muffler duct 15 at a position near the second inlet 15b. The rib 60 is provided with a length L2 that is longer than the length L1 in the longitudinal direction of the second inflow port 15b, and is longer in the vertical direction than the longitudinal opening of the second inflow port 15b.

Therefore, when the inside is seen from the outside of the second inflow port 15b, the second inflow port 15b is blocked by the rib 60. Thereby, the noise in the washing tank 3 can be blocked or reflected, and since it can be prevented from directly entering the silencing duct 15, noise leaking from the washing tank opening 3c can be reduced.

As shown in FIG. 8, the height L3 of the rib 60 is lower by about 1 to 2 mm than the height L4 of the side wall of the muffler duct 15. In order to improve the air permeability as much as possible, when the silencer duct 15 is attached to the cleaning tank 3, the rib 60 first hits the cleaning tank 3 and the side wall of the silencer duct 15 is lifted so that no gap is generated. It is to do.

  As described above, according to the dishwasher of the second embodiment of the present invention, in addition to the same effects as those of the dishwasher of the first embodiment of the present invention, the noise in the washing tub 3 is generated inside the muffler duct 15. Since the plate-like rib 60 that blocks or reflects is provided, the noise in the cleaning tank 3 does not directly enter the silencer duct 15, and the noise in the cleaning tank 3 leaks from the cleaning tank exhaust port 3c. Noise can be further reduced and the user's kitchen environment can be further improved.

Embodiment 3 FIG.
FIG. 9 is a perspective view of the silencer duct 15 of the dishwasher 1 according to Embodiment 3 of the present invention. The third embodiment is the same as the first and second embodiments of the present invention except for the rib shape of the silencer duct. Here, the description of the same parts as the first and second embodiments is omitted, and the first embodiment is omitted. 2 will be described.

  As shown in FIG. 9, a second inlet 15 b is provided on the side wall of the muffler duct 15. The second inflow port 15b is formed at an upper position away from the first inflow port so as not to be blocked by the washing water or the rinsing water stored in the washing tank 3 during the washing step or the rinsing step. .

  Inside the silencer duct 15, a corrugated rib 61 is provided at a position near the second inlet 15b. The rib 61 is provided with a length L2 that is longer than the length L1 in the longitudinal direction of the second inflow port 15b, and is longer in the vertical direction than the opening in the longitudinal direction of the second inflow port 15b.

Further, like the rib 60 of the second embodiment of the present invention, the height of the rib 61 is about 1 to 2 mm lower than the height of the side wall of the muffler duct 15 to improve the air permeability. When attaching to the cleaning tank 3, the rib 60 first hits the cleaning tank 3 so that the side wall of the muffler duct 15 is lifted so that no gap is generated.

As described above, when the inner side is viewed from the outer side of the second inlet 15b, the second inlet 15b is blocked by the rib 60. Thereby, the noise in the washing tank 3 can be reflected or blocked, and the rib 61 has a corrugated shape, so that the reflection of the noise is not linear but reflected in various directions. Accordingly, since it is possible to suppress direct entry into the muffler duct 15, it is possible to reduce noise leaking from the cleaning tank opening 3c.

  As described above, according to the dishwasher according to the third embodiment of the present invention, in addition to the same effects as those of the dishwasher according to the first embodiment of the present invention, noise in the washing tub 3 is generated inside the muffler duct 15. Since the corrugated rib 61 that blocks or reflects is provided, the noise in the cleaning tank 3 does not directly enter the silencer duct 15, and the noise in the cleaning tank 3 leaks from the cleaning tank exhaust port 3c. Noise can be further reduced, and the user's kitchen environment can be further improved.

  DESCRIPTION OF SYMBOLS 1 Tableware washing machine, 2 housing | casing, 3 washing tank, 3a recessed part, 3b washing tank ventilation port, 3c washing tank exhaust port, 4 lid body, 5 door part, 5a external exhaust port, 6 tableware basket, 7 operation part, 8 Operation switch, 9 control device, 10 water supply valve, 11a water level detection device, 11b water temperature detection device, 12 water heater, 13 pressure pump, 13a pressure pump piping, 13b pressure pump piping, 13c drainage piping, 14 injection nozzle, 14a injection port, 15 silencer duct, 15a first inlet, 15b second inlet, 16 drainage pump, 17a water level, 17b water level, 18 screw fixing boss, 19 screws, 21 drying unit, 22 drying fan, 23 Heater for drying, 24 casing, 24a ventilation opening, 41 exhaust unit, 43 shutter, 44 exhaust duct, 50 Kkin, 60 ribs, 61 ribs, 91 crockery.

Claims (6)

A washing tank that is housed in the main body and stores dishes;
A water supply valve for supplying water for washing or rinsing into the washing tank;
A heating element provided at the lower part of the washing tank, for heating washing water or rinsing water;
A pressure pump for pressurizing the washing water or the rinsing water;
An injection nozzle for injecting the washing water or the rinsing water into the tableware stored in the washing tank;
A drying unit provided at the rear of the cleaning tank and configured by a drying fan for supplying air to the cleaning tank from the outside and a drying heater for heating the air;
A cleaning tank exhaust port formed on the front surface of the cleaning tank and guiding wet air in the cleaning tank to the outside of the cleaning tank;
An exhaust duct through which the wet air led from the cleaning tank exhaust port flows;
An external exhaust port communicating with the cleaning tank exhaust port via the exhaust duct, and for discharging the wet air out of the main body;
A muffler duct mounted in the cleaning tank so as to cover the cleaning tank exhaust port,
The silencer duct is formed with a first inlet and a second inlet through which moist air can be vented between the inner surface and the inner surface of the cleaning tank in a state of being close to or in close contact with the inner surface. The first inlet is provided at a position closed by the washing water or rinsing water stored in the washing tank at the time of the cleaning process or rinsing process, and the second inlet is at the time of the cleaning process or rinsing. A dishwasher formed at an upper position away from the first inlet so as not to be blocked by the washing water or rinsing water stored in the washing tank during the process.   2. The dishwasher according to claim 1, wherein the second inlet of the silencer duct is formed at a position where the washing water or the rinsing water ejected by the ejection nozzle does not directly hit.   3. The dishwasher according to claim 1, wherein the silencer duct is provided with a rib near the second inlet in the silencer duct.   The dish washer according to claim 3, wherein a length of the rib is longer than a length of the second inflow port in a longitudinal direction.   5. The dishwasher according to claim 3, wherein the rib is formed in a flat plate shape.   5. The dishwasher according to claim 3, wherein the rib is formed in a corrugated plate shape.

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