CN112603226A

CN112603226A - Tableware cleaning and drying machine

Info

Publication number: CN112603226A
Application number: CN202010964324.2A
Authority: CN
Inventors: 佐桥敏男
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2019-10-03
Filing date: 2020-09-15
Publication date: 2021-04-06
Also published as: JP2021058245A; JP7341021B2

Abstract

Provided is a dish washing and drying machine which can reduce the fluctuation range of the temperature of the air discharged from an exhaust passage while realizing simplification, and can further restrain the long-term drying time. The tableware washing and drying machine comprises a washing tank, a washing device, a drying fan, a heater, an exhaust passage and a control part. The control section executes: the washing step includes a washing step, a heated washing step of washing the dishes after the washing step with washing water heated to a predetermined washing temperature, and a drying step of drying the dishes after the heated washing step with air. The dish washing and drying machine further includes an exhaust temperature detection mechanism provided in the exhaust passage and detecting a temperature of the exhaust air. The control unit controls the drying fan and the heater so that the temperature detected by the exhaust gas temperature detection means is within a predetermined temperature range set to be lower than a predetermined rinsing temperature until a predetermined drying time elapses after the drying process is started.

Description

Tableware cleaning and drying machine

Technical Field

The embodiment of the invention relates to a tableware cleaning and drying machine.

Background

An example of a conventional dish washing and drying machine is disclosed in japanese patent application laid-open No. 2008-161505. The tableware cleaning and drying machine comprises: the washing machine includes a washing tub for receiving dishes, a pump and a nozzle capable of supplying washing water into the washing tub, a drying fan capable of supplying air into the washing tub, and a heater capable of heating the washing water and the air. In addition, the dish washing and drying machine comprises: an exhaust passage for exhausting air from the cleaning tank, and a control part for controlling the pump, the drying fan and the heater.

The control section executes: the washing step includes a washing step of washing dishes stored in the washing tub with washing water, a heated rinsing step of rinsing the dishes after the washing step with the heated washing water, and a drying step of drying the dishes after the heated rinsing step with air.

As shown in fig. 5 and 6 of japanese patent application laid-open No. 2008-161505, the dish washing and drying machine further includes an air blowing unit. The air supply unit includes: and a cooling blower for supplying air outside the cleaning tank to the mixing chamber forming a part of the exhaust passage. When the drying process is performed, the cooling blower of the blower unit is operated, so that the outside air of the cleaning tank is mixed with the high-temperature air immediately before being discharged from the cleaning tank, thereby reducing the fluctuation range of the temperature of the air discharged from the exhaust passage. Accordingly, it is possible to suppress: for example, the high-temperature air is discharged from the exhaust passage to give an uncomfortable feeling to a person standing in front of the dish washing and drying machine.

However, in the above-described conventional dish washing and drying machine, since the air blowing unit including the cooling air blower is provided, it is difficult to simplify the structure and reduce the fluctuation range of the temperature of the air discharged from the exhaust passage. Further, when the fluctuation range slips, it is difficult to suppress the increase in the drying time.

Disclosure of Invention

Therefore, as a non-limiting 1 object of the present invention, there is provided: the dishwasher can simplify the operation and reduce the fluctuation range of the temperature of the air discharged from the exhaust passage, thereby suppressing the long-term drying time. This object is achieved by the invention of claim 1. Further developments of the invention are described in the dependent claims.

The tableware cleaning and drying machine of the invention comprises: a washing tub for storing dishes, a washing device capable of supplying washing water into the washing tub, a drying fan capable of supplying air into the washing tub, a heater capable of heating the washing water and the air, an exhaust passage for exhausting the air from the washing tub, and a control unit for controlling the washing device, the drying fan, and the heater,

the control section executes: a washing step of washing the dishes stored in the washing tub with the washing water, a hot washing step of washing the dishes after the washing step with the washing water heated to a predetermined washing temperature, and a drying step of drying the dishes after the hot washing step with the air,

the dish washing and drying machine further comprises: an exhaust temperature detection means provided in the exhaust passage and detecting a temperature of the air discharged,

the control unit controls the drying fan and the heater so that the temperature detected by the exhaust gas temperature detection means is at a temperature of: is set to be within a predetermined temperature range lower than the predetermined flushing temperature.

According to the dish washing and drying machine of the present invention, since the air blowing unit including the cooling air blower related to the conventional dish washing and drying machine is not provided, simplification can be achieved.

In the dish washing and drying machine, the control unit performs, after the drying process is started, the following operations for the drying fan and the heater: based on control of an exhaust gas temperature detection mechanism provided on the exhaust passage. Accordingly, in the dish washing and drying machine, overshoot or undershoot of temperature control can be suppressed for the drying fan and the heater. As a result, in the dish washing and drying machine, the temperature of the air discharged from the exhaust passage can be easily lowered on the high temperature side and also easily raised on the low temperature side.

Therefore, according to the dish washing and drying machine of the present invention, the range of variation in the temperature of the air discharged from the exhaust passage can be reduced while achieving simplification. As a result, since the slip-down (the down vibration れ) of the fluctuation range is easily suppressed, the long-term drying time can be suppressed. Further, since the rise of the fluctuation range (the rising vibration れ) can be easily suppressed, it is possible to suppress: the high-temperature air is discharged from the exhaust passage to give an uncomfortable feeling to a person standing in front of the dish washing and drying machine. Further, according to the dishwasher, the predetermined washing temperature in the heating and washing step is set to be low, and the temperature of the air discharged from the exhaust passage is lowered at the initial stage of the drying step, and accordingly, when soft exhaust is performed to lower the predetermined temperature range in the middle stage of the drying step, it is possible to effectively suppress the predetermined drying time from being prolonged.

In addition, fig. 7 of the above-mentioned japanese patent application laid-open No. 2008-161505 shows a temperature detection element provided in an exhaust chamber. However, the above-mentioned japanese patent application laid-open No. 2008-161505 merely discloses the control of the energization of the cooling blower corresponding to the state of the air in the cleaning tank by using the temperature detection element, and does not describe or suggest the application of the temperature detection element to the control of the drying fan and the heater.

In addition, the 2 nd temperature sensor 7 of the dish washing and drying machine disclosed in japanese patent laid-open No. 10-286212 is only: if "Yes" is used in step S37 of fig. 6 of the above-mentioned publication, the operation of the blower fan 14 is stopped before the predetermined drying time elapses. None of the above publications describes or suggests: the blower fan 14 and the heater 9 are controlled by using the 2 nd temperature sensor 7 until a predetermined drying time elapses.

In another aspect of the present invention, it is preferable that the control unit is capable of switching the drying fan between a 1 st mode in which air is supplied at a predetermined air volume and a 2 nd mode in which air is supplied at an air volume larger than the predetermined air volume. Preferably, the control unit is capable of selecting a 1 st aspect and a 2 nd aspect, in which in the 1 st aspect, the drying fan is operated in a 1 st mode at an initial stage of the drying process, and the drying fan is switched to a 2 nd mode from a middle stage of the drying process, and in the 2 nd aspect: the drying fan is operated in the 2 nd mode from the beginning of the drying process.

According to this configuration, when the control unit selects the 2 nd mode, the drying fan operating in the 2 nd mode from the initial stage of the drying process can improve: the control unit controls the responsiveness of the temperature of the air discharged from the exhaust passage. As a result, according to the dish washing and drying machine, it is possible to further effectively suppress: in the soft exhaust, the predetermined drying time may be prolonged.

Other aspects and advantages of the present invention can be ascertained from the following description and the appended drawings, the illustrations shown in the drawings, and the concepts of the present invention disclosed throughout the specification and the drawings.

Drawings

Fig. 1 is a simulated sectional view of the dish washing and drying machine of the embodiment.

Fig. 2 is a block diagram of the dish washing and drying machine of the embodiment.

Fig. 3 is an explanatory diagram showing the flow of the cleaning operation and the setting of each step in the examples and comparative examples.

Fig. 4 is a graph showing changes in the temperature detected by the 2 nd temperature sensor in the heating and washing step and the drying step by the ON/OFF selection of the soft exhaust air in the dish washing and drying machine according to the embodiment.

Fig. 5 is a graph showing changes in the detection temperature of the 1 st temperature sensor in the heating and washing step and the drying step by the ON/OFF selection of the soft exhaust gas in the dish washing and drying machine of the comparative example.

Description of the figures

1 … tableware washing and drying machine; TW1 … tableware; 7 … cleaning tank; 61. 62 … cleaning device (61 … nozzle, 62 … pump); 68 … drying fan; a 63 … heater; 79 … exhaust passage; a C1 … control unit; 32 … exhaust gas temperature detection means (2 nd temperature sensor).

Detailed Description

Embodiments according to the present invention will be described below with reference to the drawings.

(examples)

As shown in fig. 1, a dish washing and drying machine 1 according to an embodiment is an example of a specific embodiment of the dish washing and drying machine according to the present invention. The dish washing and drying machine 1 is a front surface drawer type dryer provided at a lower position of a ceiling CT1 of a built-up kitchen.

< housing, cleaning tank, and lid >

The dish washing and drying machine 1 includes a casing 9, a washing tub 7, and a lid 8. In the present embodiment, the side surface of the case 9, which is a substantially box-shaped body, facing the user using the built-up kitchen, i.e., the left side of the sheet of fig. 1 is defined as the front side of the case 9, and the right side of the sheet of fig. 1 is defined as the back side of the case 9.

The upper surface side of the housing 9 is covered with a ceiling CT 1. The housing 9 has a housing opening 9H. The case opening 9H is configured to: the housing 9 is opened in a wide range from an upper end portion to a lower end portion on the front surface side of the housing 9, and the inside of the housing 9 communicates with the outside.

Cleaning tub 7 is housed in case 9. The position of the cleaning tank 7 shown in fig. 1 is defined as a storage position. A slide rail mechanism, not shown, is disposed between the side surface of the cleaning tank 7, which is a substantially box-shaped body, and the inner wall surface of the housing 9. Although not shown, cleaning tub 7 is slidable with respect to housing 9 by the slide rail mechanism.

The cleaning tank 7 has an opening 7H. The opening 7H is constituted by: so that the upper surface side of the cleaning tank 7 is open. A handle portion 7G is provided at an upper end portion on the front surface side of washing tub 7.

The user grips handle portion 7G and manually slides washing tub 7 from the storage position toward the front surface side of case 9, and this is: washing tub 7 is pulled out to the front from casing 9. Further, the user manually slides cleaning tub 7 in a pulled-out state toward the back side of case 9, thereby returning cleaning tub 7 to the storage position.

Lid 8 is disposed on the upper side in case 9, and can close or open opening 7H of cleaning tank 7. Lid 8 is linked to slide of washing tub 7 by a not-shown link mechanism, and can move up and down between a position shown in fig. 1 and a position not shown below: a position raised from the position shown in fig. 1 to allow the cleaning tank 7 to slide.

In the state where cleaning tank 7 is at the storage position, case opening 9H is closed, and opening 7H is closed by lid 8.

Although not shown, in a state where cleaning tank 7 is drawn out from casing 9, opening 7H exposed to the outside of casing 9 is opened by lid 8 left in casing 9. Accordingly, the user can store tableware TW1 in washing tub 7 through opening 7H, or can take tableware TW1 out of washing tub 7.

Inside the casing 9, there are provided: a water supply pipe P1, a water supply electromagnet block 69 and a drain pipe P2. The water supply pipe P1 is for supplying water from a water supply source, not shown, provided outside the dish washer-dryer 1 to the washing tub 7. The water supply electromagnetic pin 69 is used for opening and closing the water supply pipe P1, so that: the supply and stop of water to washing tub 7. The drain pipe P2 is used to drain the washing water in the washing tub 7 to the outside of the dish washing and drying machine 1.

The bottom in the cleaning tank 7 is provided with: a water storage part 71 for storing washing water. Further, a dish basket 70 is disposed in washing tub 7. The tableware TW1 can be carried on the tableware basket 70. Tableware TW1 is, for example: tableware such as teabowls, plates and glasses, and tableware such as chopsticks, spoons and forks.

The cleaning tank 7 is provided with an exhaust passage 79. Exhaust passage 79 communicates with the outside of washing tub 7 through exhaust port 79A that opens below handle portion 7G on the front surface of washing tub 7. The communication port 79B on the opposite side of the exhaust port 79A in the exhaust passage 79 is: an inner wall surface surrounding dish basket 70 in washing tub 7 is opened. The exhaust passage 79 is bent into a substantially S-shape between the exhaust port 79A and the communication port 79B. The exhaust passage 79 is used to exhaust air from the inside of the cleaning tank 7.

< nozzle and pump >

The dish washing and drying machine 1 further includes a nozzle 61 and a pump 62. The nozzle 61 and the pump 62 are examples of the "cleaning device" of the present invention. The nozzle 61 is disposed in the cleaning tank 7. The pump 62 is assembled below the water storage section 71 of the cleaning tank 7. The nozzle 61 and the pump 62 move together with the cleaning tank 7 when the cleaning tank 7 is moved in and out.

Nozzle 61 can spray washing water into washing tub 7 from a plurality of discharge holes. The spraying direction of nozzle 61 may be changed in various directions in order to reliably wash a plurality of dishes TW1 stacked in washing tub 7 or wash the inner wall surface of washing tub 7 or dish basket 70.

When the pump 62 is operated in the normal rotation direction, the cleaning water stored in the water storage portion 71 of the cleaning tub 7 can be supplied to the nozzle 61 so as to be sprayed into the cleaning tub 7. Since the sprayed washing water is stored in the water storage portion 71, the washing water is repeatedly supplied to the nozzle 61 by the pump 62. In addition, when the pump 62 performs the reverse rotation operation, the washing water in the washing tub 7 can be discharged to the outside of the dishwasher 1 through the residue filter 67 and the drain pipe P2.

< Heater, drying Fan, No. 1 temperature sensor, No. 2 temperature sensor, and Water level sensor >

The dish washing and drying machine 1 further includes: a heater 63, a drying fan 68, a 1 st temperature sensor 31, a 2 nd temperature sensor 32, and a water level sensor 34. The 2 nd temperature sensor 32 is an example of the "exhaust gas temperature detection means" of the present invention.

Heater 63, drying fan 68, 1

st temperature sensor

31, 2 nd temperature sensor 32, and water level sensor 34 are also assembled to washing tub 7, and move together with washing tub 7 when washing tub 7 is moved in and out.

The heater 63 is disposed at the bottom of the water storage portion 71. Heater 63 heats the cleaning water stored in water storage section 71 of cleaning tub 7 or the air in cleaning tub 7. By controlling the energization of heater 63 to generate heat continuously or stopping the generation of heat, the washing water stored in water storage section 71 is heated to a predetermined temperature range and is sprayed into washing tub 7 through nozzle 61 and pump 62.

By the rotation operation of the drying fan 68, air can be introduced from the outside of the dish washing and drying machine 1 and supplied into the washing tub 7. Heater 63 is continuously controlled to generate heat or stop generating heat, and air supplied into washing tub 7 by drying fan 68 is heated to a predetermined temperature range, flows through washing tub 7 while drying tableware TW1, and is then discharged from exhaust passage 79 to the outside of washing tub 7, i.e., to the front surface side of casing 9.

The 1 st temperature sensor 31 is provided with: is located at a lower position with respect to the heater 63 in the bottom of the water storage portion 71. First temperature sensor 31 detects the temperature in washing tub 7, and more specifically, first temperature sensor 31 detects the temperature of the washing water stored in water storage section 71 of washing tub 7 or the air in washing tub 7 in the vicinity of heater 63.

The 2 nd temperature sensor 32 is provided in the middle of the exhaust passage 79 and is located near the exhaust port 79A. The 2 nd temperature sensor 32 detects the temperature of the air in the exhaust passage 79. More specifically, when the air in cleaning tank 7 is introduced into exhaust passage 79 from communication port 79B, passes through exhaust passage 79, and is discharged to the outside of cleaning tank 7 from

exhaust port

79A, 2 nd temperature sensor 32 detects the temperature of the discharged air in the vicinity of exhaust port 79A.

The water level sensor 34 is: a float sensor is provided in a water level detection tank 34A disposed adjacent to a water storage section 71 of the cleaning tank 7. Water level detection tank 34A is connected to water storage unit 71 of washing tank 7 via communication pipe P3. The water level sensor 34 detects the level of the washing water in the washing tub 7.

< control unit, operation unit, and display unit >

As shown in fig. 1 and 2, the dish washing and drying machine 1 further includes: a control unit C1, an operation unit 40, and a display unit 47.

As shown in fig. 1, the control unit C1 is disposed: the front surface side of cleaning tub 7 is located below handle 7G. Operation unit 40 and display unit 47 are disposed at the upper end portion of the front surface side of cleaning tank 7.

The control unit C1 is: an electronic circuit unit configured by a CPU, a memory, an interface circuit, and the like, which are not shown. As shown in fig. 2, the control section C1 includes a storage section C12. The storage unit C12 is a memory constituting the control unit C1, and is configured by storage elements such as ROM and RAM.

The storage unit C12 stores: various programs, for example, a washing operation program, which are executed by the control unit C1 to drive the dishwasher 1 to operate. Further, the storage unit C12 stores: various information such as setting information of the dishwasher 1, initial setting information for executing various programs, and the like.

The control part C1 receives detection signals from the 1 st temperature sensor 31, the 2 nd temperature sensor 32, and the water level sensor 34. The control unit C1 also receives detection signals from sensors, not shown, such as: a position sensor for detecting whether the cleaning tank 7 is at the storage position, or a lock sensor for detecting whether the cleaning tank 7 has been locked at the storage position.

Then, the control unit C1 outputs a control signal via the drive circuit 60 to perform the following washing operation: the operations of the pump 62, the water supply solenoid man 69, the heater 63, and the drying fan 68 are controlled to wash and dry the dishes TW1 stored in the washing tub 7.

In the drying fan 68, the control unit C1 changes the driving voltage or the like to change the rotational speed, and can switch to: a 1 st mode in which air is supplied at a predetermined air volume, and a 2 nd mode in which air is supplied at an air volume larger than the predetermined air volume.

The operation unit 40 includes: a power key, a plurality of keys not shown for a user to perform input operations, and the like. The control unit C1 acquires: information input by the user through various operations performed on the operation unit 40.

The display unit 47 includes: a lamp, or a display device capable of displaying numerals, characters, and the like for transmitting various information to a user. The control unit C1 transmits information related to the setting and the like of the cleaning operation and various information such as the progress status of the cleaning operation to the display unit 47 and displays them.

< performing a plurality of steps and Soft exhaust in cleaning operation >

When the user places tableware TW1 in tableware basket 70 of washing tub 7 in the state pulled out from casing 9 and then presses the power key of operation unit 40 to turn on the power supply, control unit C1 executes, as shown in fig. 3, the following steps in the flow chart of steps S101 to S107: a cleaning step, a rinsing step, a heating and rinsing step, and a drying step in the cleaning operation.

Initially, in step S101, the control unit C1 allows the user to select ON/OFF of the soft exhaust gas using the display unit 47 and the operation unit 40. The specific contents of the soft exhaust will be described in steps S106 and S107.

Next, in step S102, the control unit C1 allows the user to select a desired process from among a plurality of processes having different setting contents for the plurality of processes, using the display unit 47 and the operation unit 40. In this embodiment, a case where the user selects a standard process will be described.

Next, in step S103, control unit C1 starts the cleaning operation when a position sensor, not shown, detects that the user has moved cleaning tub 7 to the storage position and a lock sensor, not shown, detects that cleaning tub 7 has been locked at the storage position.

Then, the control unit C1 executes the cleaning process in step S104. In the washing step, the detergent previously put into a predetermined position of washing tub 7 is dissolved in the washing water supplied to washing tub 7. Then, while the cleaning water stored in water storage section 71 of cleaning tub 7 is heated by heater 63, pump 62 is operated to spray the heated cleaning water from nozzle 61 into cleaning tub 7. Accordingly, the detergent contained in the washing water can promote the decomposition of the dirt of tableware TW1 contained in washing tub 7, and the dirt component is transferred from tableware TW1 to the washing water. At least at the end of the washing process, the reverse rotation of the pump 62 causes the washing water containing the detergent and the dirt to be discharged to the outside of the dishwasher 1 through the drain pipe P2.

In the washing step, controller C1 controls the temperature of the heated washing water in washing tub 7 to be 50 ℃ based on the result of detection of the temperature of the washing water stored in water storage unit 71 of washing tub 7 by temperature sensor 31, mainly, as a result of the detection.

Next, the control unit C1 executes a flushing process in step S105. In the washing step, the dishes TW1 after the washing step are washed with clean washing water newly supplied to washing tub 7.

Specifically, the nozzle 61 ejects: the washing water, which is not heated by the heater 63, is used to remove the washing water containing detergent and dirt components on the dishes TW 1. Then, the reverse rotation of the pump 62 discharges the washing water contaminated by the washing to the outside of the dishwasher 1 through the drain pipe P2. The injection of clean washing water and the discharge of dirty washing water are repeated many times.

Next, the control unit C1 performs a heating and washing process in step S106. Even in the heating rinsing step, clean rinsing water newly supplied to rinsing tub 7 is used in the same manner as in the rinsing step. In the hot rinsing step, the dishes TW1 after the rinsing step are rinsed with heated rinsing water, unlike in the rinsing step.

Specifically, the washing water heated to the predetermined rinsing temperature by heater 63 is ejected from nozzle 61 into washing tub 7 to remove the washing water containing detergent and dirt on dishes TW 1. Then, the reverse rotation of the pump 62 discharges the washing water contaminated by the washing to the outside of the dishwasher 1 through the drain pipe P2.

In the hot rinsing step when the soft exhaust gas is OFF, control unit C1 controls the temperature of the heated washing water in washing tub 7 to be 70 ℃ as the predetermined rinsing temperature and 45 minutes as the predetermined hot rinsing time, based mainly on the result of detection by temperature sensor 1 of the temperature of the washing water stored in water storage unit 71 of washing tub 7.

ON the other hand, in the hot rinsing step when the soft exhaust gas is ON, control unit C1 controls the temperature of the heated washing water in washing tub 7 to be a predetermined rinsing temperature of 65 ℃ and a predetermined hot rinsing time of 55 minutes, based mainly ON the result of detection by temperature sensor 1 of the temperature of the washing water stored in water storage unit 71 of washing tub 7.

That is, in the heat rinsing step when the soft exhaust gas is ON, the set rinsing temperature is lower by 5 ℃ and the set rinsing time is longer by 10 minutes, as compared with the heat rinsing step when the soft exhaust gas is OFF.

Next, the control unit C1 executes a drying process in step S107. In the drying step, controller C1 supplies air into washing tub 7 by drying fan 68, and dries tableware TW1 after the heating and washing step with the air.

At this time, the control unit C1 controls the drying fan 68 and the heater 63 so that the temperature of the air in the exhaust passage 79 detected by the 2 nd temperature sensor 32 is: is set within a predetermined temperature range lower than the predetermined flushing temperature.

That is, in the drying step, the temperature of the air discharged from exhaust port 79A of exhaust passage 79 is controlled by using not the 1 st temperature sensor 31 for detecting the temperature of the air in cleaning tub 7 apart from exhaust passage 79 but the 2 nd temperature sensor 32 located near exhaust port 79A.

More specifically, when the soft exhaust is OFF, the control unit C1 operates the drying fan 68 in the 1 st mode with a small air volume without operating the heater 63 until the temperature detected by the 2 nd temperature sensor 32 is reduced to 60 ℃. Thereafter, the control unit C1 performs feedback control on the heater 63 to intermittently generate heat so that the temperature detected by the 2 nd temperature sensor 32 is within the predetermined temperature range of 60 to 50 ℃ and the drying fan 68 is operated in the 2 nd mode with a large air volume in the middle stage of the drying process. The controller C1 controls the predetermined drying time to be 60 minutes. The control method of the drying fan 68 by the control unit C1 when the soft exhaust is OFF is an example of the "1 st embodiment" of the present invention.

ON the other hand, when the soft exhaust gas is ON, the control unit C1 operates the drying fan 68 in the 2 nd mode with a large air volume without operating the heater 63 until the temperature detected by the 2 nd temperature sensor 32 is reduced to 55 ℃. Thereafter, the control unit C1 performs feedback control on the heater 63 to intermittently generate heat so that the temperature detected by the 2 nd temperature sensor 32 is within the predetermined temperature range of 50 to 40 ℃ and the drying fan 68 is maintained in the 2 nd mode with a large air volume in the middle stage of the drying process. The controller C1 controls the predetermined drying time to be 65 minutes. The control method of the drying fan 68 by the control unit C1 when the soft exhaust is ON is an example of the "2 nd embodiment" of the present invention.

That is, in the drying step when the soft exhaust gas is ON, the upper limit and the lower limit of the predetermined temperature range are set to be lower by 10 degrees centigrade, respectively, and the predetermined drying time is lengthened by 5 minutes, as compared with the drying step when the soft exhaust gas is OFF.

When the predetermined drying time is reached, the control unit C1 ends the washing operation. As shown in the lower side of the paper surface of fig. 3, the cleaning performance, the drying performance and the operation time are good when the soft exhaust is ON and OFF. In particular, although the predetermined drying time is increased by 5 minutes when the soft exhaust is ON compared with the time when the soft exhaust is OFF, and the operation time of the cleaning operation is increased by 15 minutes when the soft exhaust is OFF, the predetermined drying time can be effectively prevented from being lengthened.

A broken line L11 indicated by a two-dot chain line in fig. 4 indicates: the change in the detection temperature of the 2 nd temperature sensor 32 in the heating and washing step and the drying step when the soft exhaust gas is OFF. The broken line L12 shown by a solid line in fig. 4 represents: the change in the detection temperature of the 2 nd temperature sensor 32 in the heating flushing step and the drying step when the soft exhaust gas is ON.

In the embodiment, the controller C1 feedback-controls the heater 63 based on the 2 nd temperature sensor 32 located in the vicinity of the exhaust port 79A, and thereby, even if the fluctuation range of the predetermined temperature range is set to 10 ℃ which is small, overshoot or undershoot of the temperature control can be suppressed, and the fluctuation range of the temperature of the air discharged from the exhaust port 79A of the exhaust passage 79 can be reduced.

Here, as a comparative example, a case will be described in which: in the drying step, control unit C1 performs feedback control of heater 63 based on temperature sensor 1 for detecting the temperature of the air in cleaning tank 7, which is separated from exhaust passage 79. That is, in the comparative example, the 2 nd temperature sensor 32 is not used in the temperature control in the drying step.

In this case, when the drying fan 68 is operated in the initial and middle stages of the drying process, and the heater 63 stops generating heat, and the temperature in the washing tub 7 decreases, the temperature detected by the 1 st temperature sensor 31 located at the position of the water storage section 71 decreases rapidly following the decrease in the temperature of the heater 63. On the other hand, since the air absorbs thermal energy from the dishes TW1 having a high temperature, the decrease in the temperature of the air around dish basket 70 in washing tub 7 is significantly delayed from the decrease in the temperature detected by temperature sensor 1.

In addition, in the middle stage of the drying process, when the drying fan 68 and the heater 63 are operated, the temperature detected by the 1 st temperature sensor 31 rapidly increases following the temperature increase of the heater 63. On the other hand, since the temperature of the air around dish basket 70 in washing tub 7 rises, dish TW1 absorbs thermal energy from the air, the rise is significantly delayed from the rise in the temperature detected by temperature sensor 1.

That is, in the comparative example, since overshoot or undershoot of temperature control is likely to increase, it is necessary to change the setting of the drying step from the example, as shown in the right side of the paper surface of fig. 3.

Specifically, in the comparative example, the predetermined temperature range needs to be changed to 60 to 40 ℃ in the middle stage of the drying process when the soft exhaust gas is OFF. In addition, in the middle stage of the drying process when the soft exhaust is ON, the predetermined temperature range needs to be changed to 50 to 30 ℃, and the predetermined drying time also needs to be greatly prolonged to 80 minutes. As a result, the operation time was "x", i.e., failure, as shown in the lower side of the paper surface of fig. 3.

A broken line L21 indicated by a two-dot chain line in fig. 5 indicates: the temperature of the 1 st temperature sensor 31 changes in the heating and washing step and the drying step when the soft exhaust gas is OFF. The broken line shown by the solid line L22 in fig. 5 is a representation: the temperature of the 1 st temperature sensor 31 changes in the heating flushing step and the drying step when the soft exhaust gas is ON.

As described above, in the comparative example, the range of fluctuation of the temperature of the air discharged from the exhaust port 79A of the exhaust passage 79 is difficult to be reduced as compared with the example, because the heater 63 is feedback-controlled based on the 1 st temperature sensor 31 located at a position inside the cleaning tank 7 apart from the exhaust passage 79, and thus the range of fluctuation of the predetermined temperature range needs to be set to 20 ℃ in a large manner.

< action Effect >

The dishwasher 1 of the embodiment does not include an air blowing unit including a cooling air blower related to the conventional dishwasher as shown in fig. 1, and thus can be simplified.

In addition, according to the dishwasher 1, as shown in fig. 3 and 4, the control unit C1 operates the drying fan 68 after the start of the drying process until a predetermined drying time elapses, and performs, for the heater 63: based on feedback control of the 2 nd temperature sensor 32 provided on the exhaust passage 79. Accordingly, according to the dish washing and drying machine 1, overshoot or undershoot of temperature control can be suppressed in comparison with the case where the temperature of the air in the washing tub 7 separated from the exhaust passage 79 is detected and controlled with respect to the drying fan 68 and the heater 63. As a result, according to the dishwasher 1, the temperature of the air discharged from the exhaust port 79A of the exhaust passage 79 is easily lowered on the high temperature side and is easily raised on the low temperature side.

Therefore, according to the dishwasher 1 of the embodiment, the range of variation in the temperature of the air discharged from the exhaust port 79A of the exhaust passage 79 can be reduced while achieving simplification. As a result, since the slip of the fluctuation range is easily suppressed, the drying time can be suppressed from increasing. Further, since the rise of the fluctuation width is easily suppressed, it is possible to suppress the discharge of the high-temperature air from the exhaust port 79A to give a feeling of discomfort to a person standing in front of the dish washing and drying machine 1. Further, according to the dishwasher 1, the predetermined washing temperature in the hot washing step is set to be low, and the temperature of the air discharged from the exhaust port 79A of the exhaust passage 79 is lowered at the initial stage of the drying step, and accordingly, when the soft exhaust is performed to lower the predetermined temperature range at the middle stage of the drying step, it is possible to effectively suppress the predetermined drying time from being prolonged. Specifically, as shown in fig. 3, when the soft exhaust is ON, the predetermined drying time can be suppressed to be longer than 5 minutes, and the operation time of the cleaning operation can be suppressed to be longer than 15 minutes.

Further, according to the dish washing and drying machine 1, when the soft exhaust air is ON, the control unit C1 operates the drying fan 68 in the 2 nd mode with a large air volume from the beginning of the drying process. With this configuration, since drying fan 68 operating in mode 2 from the beginning of the drying process supplies air into cleaning tub 7 with a large air volume, the responsiveness of controller C1 in controlling the temperature of the air discharged from exhaust port 79A of exhaust passage 79 can be improved. As a result, according to the dish washing and drying machine 1, when the above-described soft exhaust is performed, it is possible to further effectively suppress the predetermined drying time from being lengthened.

Although the present invention has been described above by way of examples, the present invention is not limited to the above examples, and it goes without saying that the present invention is also applicable by making appropriate changes within the scope not departing from the gist thereof.

For example, although the exhaust passage 79 is provided on the front surface side of the pull-out type cleaning tank 7 in the embodiment, the present invention is not limited to this configuration, and for example, a configuration in which the exhaust passage is provided in a casing that houses the cleaning tank is also included in the present invention.

In the embodiment, the dish washing and drying machine 1 includes 1 heater 63, but the present invention is not limited to this configuration, and for example, a configuration in which the dish washing and drying machine includes a 1 st heater for heating washing water and a 2 nd heater for heating air is included in the present invention.

Claims

1. A dish washing and drying machine is provided with:

a washing tank (7) for containing tableware (TW 1);

washing devices (61, 62) capable of supplying washing water into the washing tank;

a drying fan (68) capable of supplying air into the cleaning tank;

a heater (63) capable of heating the washing water and the air;

an exhaust passage (79) for exhausting the air from the cleaning tank; and

a control unit (C1) for controlling the cleaning device, the drying fan, and the heater,

the control unit (C1) executes: a washing step of washing the dishes (TW1) housed in the washing tub (7) with the washing water, a heated rinsing step of rinsing the dishes (TW1) after the washing step with the washing water heated to a predetermined rinsing temperature, and a drying step of drying the dishes (TW1) after the heated rinsing step with the air,

it is characterized in that the preparation method is characterized in that,

the dish washing and drying machine further comprises: an exhaust temperature detection means (32) provided in the exhaust passage (79) and detecting the temperature of the air discharged,

the control unit (C1) controls the drying fan (68) and the heater (63) so that the temperature detected by the exhaust gas temperature detection means (32) is at a temperature that is: is set to be within a predetermined temperature range lower than the predetermined flushing temperature.

2. The dishwasher of claim 1, characterized in that,

the control unit (C1) is capable of switching the drying fan (68) between a 1 st mode in which the air is supplied at a predetermined air volume and a 2 nd mode in which the air is supplied at an air volume greater than the predetermined air volume,

the control unit (C1) is configured to be able to select a 1 st aspect in which the drying fan (68) is operated in the 1 st mode at an initial stage of the drying process, the drying fan (68) is switched to the 2 nd mode from a middle stage of the drying process, and a 2 nd aspect in which the drying fan (68) is operated in the 2 nd mode from the initial stage of the drying process.