Drying judgment method of kitchen waste processor

Abstract

The invention discloses a drying judgment method of a kitchen waste processor, which comprises the following steps: after drying is started, a control unit records the temperature T0 and the relative humidity U0 of a drying starting point, and after an evaporation stage is finished, when the current relative humidity U1 is detected to be lower than 80%, the control unit records the current temperature T1; the control unit obtains a current target humidity value Ub through table look-up and calculation, the target humidity value Ub obtained through calculation serves as a comparison value used for judging whether drying is stopped or not, then the current relative humidity U1 and the current temperature T1 are detected once again every 15 minutes, and calculation of the current target humidity value Ub and comparison of U1 and Ub are repeated till U1lt; if yes, it is judged that drying is completed. According to different environment temperature and humidity, the dynamic reference humidity values in different working states are calculated in real time, and the influence of the environment temperature and humidity on the judgment result is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of a drying control unit of a food waste disposer, and in particular to a drying determination method of a food waste disposer. Background Art

[0002] The food waste disposer is used to convert food waste into fertilizer. The program of the food waste disposer stores a fixed benchmark humidity value for determining whether to stop drying. The manufacturer of each food waste disposer uses the experience data of its own products. When the humidity measured in real time by the hygrometer built into the food waste disposer reaches or is lower than this benchmark humidity, the program of the food waste disposer determines that the garbage and other contents in the inner barrel have been dried, thereby ending the drying stage and entering the next process.

[0003] At present, the drying control of food waste disposers is ultimately to set a certain reference humidity value or other parameter values ​​related to the reference humidity value, and compare the real-time measured value with it to make a decision whether to stop drying. But in fact, the actual humidity value in the inner barrel will change with the changes in ambient temperature and ambient humidity. Using the same reference parameter value as a comparison value may cause misjudgment, which will result in the contents of the inner barrel not being dried, and the contents of the inner barrel of the food waste disposer cannot be dried to a suitable state. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a drying determination method for a food waste disposer, which can calculate the dynamic reference humidity value under the working state in real time according to different ambient temperatures and humidities, thereby avoiding the influence of ambient temperature and humidity on the determination result.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a method for determining the drying of a food waste disposer, comprising the following steps:

[0006] A saturated water vapor pressure-temperature comparison table is stored in the control system of the food waste disposer. The saturated water vapor pressure-temperature comparison table provides the pressure values ​​of saturated water vapor corresponding to different temperatures under atmospheric pressure conditions.

[0007] Start drying, the control system dries the contents of the inner barrel through the drying device, and at the same time directly or indirectly detects the temperature and relative humidity of the inner barrel space of the inner barrel in real time and continuously through the thermometer and hygrometer. After starting drying, the control system records the temperature T0 and relative humidity U0 at the starting point of drying.

[0008] Calculate the target humidity value U bAfter detecting that the current relative humidity U1 is lower than 60% and the current temperature T1 is basically stable, the control system looks up the saturated water vapor pressure temperature comparison table to obtain the saturated water vapor pressure corresponding to the relative humidity U0. c0 And the saturated water vapor pressure e corresponding to the relative humidity U1 c1 , and calculate the target humidity value U according to the following calculation formula b ,

[0009] U b =e c0 / e c1 *U0+a, a is 1-10%,

[0010] Stop drying and calculate the target humidity value U in the control system b Then keep drying until the current relative humidity is detected to be lower than the target humidity value U b Stop drying after that or delay drying.

[0011] A method for determining the drying of a food waste disposer comprises the following steps:

[0012] A saturated water vapor pressure-temperature comparison table is stored in the control unit of the food waste disposer.

[0013] The saturated water vapor pressure temperature comparison table provides the saturated water vapor pressure values ​​corresponding to different temperatures under a standard atmospheric pressure condition.

[0014] The drying step is started. At the detection point in the manifold or air duct of the food waste disposer for exhausting the airflow, the control unit dries the contents of the inner barrel through the drying device, and at the same time, the detection element set at the detection point continuously detects the detection point in real time. Temperature and relative humidity , the control unit simultaneously records the temperature T0 and relative humidity U0 detected by the detection element when the drying is started;

[0015] Calculation steps: After the initial heating stage and evaporation stage, the relative humidity at the detection point begins to slowly decrease. When the control unit detects that the current relative humidity at the detection point is equal to or less than 80%, the control unit records the current temperature T1 and the current relative humidity U1 obtained by the current detection, and then the control unit looks up the saturated water vapor pressure e corresponding to the temperature T0 from the saturated water vapor pressure temperature comparison table. c0 And the saturated water vapor pressure e corresponding to temperature T1 c1 , and calculate the current target humidity value Ub according to the following calculation formula:

[0016] U b =e c0 / e c1 *U0+a, a is 1-10%;

[0017] Automatic determination step, after calculating the current target humidity value U b The control unit then compares the current relative humidity U1 with the current target relative humidity U b And according to the comparison results, the drying state of the food waste disposer and the working state of the drying device are automatically determined.

[0018] If the comparison result is U1>U b , the control unit automatically determines that the drying is not completed, and controls the drying device to continue drying.

[0019] If the comparison result is U1≤U b , the control unit automatically determines that the drying is completed, and the control unit controls the drying device to stop drying.

[0020] A further technical solution is that the automatic determination step,

[0021] If the comparison result is U1>U b , then the control unit records the temperature T1 and the relative humidity U1 currently re-detected every 1-30 minutes, and repeats the calculation step and the automatic determination step in sequence with the newly recorded temperature T1 and relative humidity U1.

[0022] A further technical solution is that the automatic determination step,

[0023] If the comparison result is U1>U b , then the control unit records the temperature T1 and the relative humidity U1 currently re-detected every 5-15 minutes, and then obtains the corresponding saturated water vapor pressure e from the saturated water vapor pressure temperature comparison table. c1 , and then substitute the calculation formula in the calculation step to recalculate the current target humidity value U b , and then take the target humidity value U b And the automatic determination step is repeated for the newly recorded relative humidity U1.

[0024] A further technical solution is that the automatic determination step,

[0025] If the comparison result is U1≤U b The control unit controls the drying device to stop drying and perform a countdown cooling process, and stops the program after the countdown ends, thereby completing the drying process and drying the contents to a suitable state.

[0026] According to a further technical solution, the drying device includes a heater disposed in the food waste disposer, and the bottom of the inner barrel is heated by the heater to dry the contents in the inner barrel.

[0027] According to a further technical solution, when it is detected that the current temperature T1 is in the range of 35-80° C., a in the calculation formula is 3-8%.

[0028] Compared with the prior art, the present invention has the advantages of: according to different environmental temperatures and humidity, the dynamic reference humidity values ​​under different working conditions are calculated in real time, thereby avoiding the influence of environmental temperature and humidity on the determination result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the present invention.

[0030] Figure 2-1 to Figure 2-3 It is a saturated water vapor pressure temperature comparison table of the present invention. DETAILED DESCRIPTION

[0031] A method for determining the drying of a food waste disposer comprises the following steps:

[0032] A saturated water vapor pressure-temperature comparison table is stored in the control system of the food waste disposer. The saturated water vapor pressure-temperature comparison table provides the pressure values ​​of saturated water vapor corresponding to different temperatures under atmospheric pressure conditions.

[0033] Start drying, the control system dries the contents of the inner barrel through the drying device, and at the same time directly or indirectly detects the temperature and relative humidity of the inner barrel space of the inner barrel in real time and continuously through the thermometer and hygrometer. After starting drying, the control system records the temperature T0 and relative humidity U0 at the starting point of drying.

[0034] Calculate the target humidity value U b After detecting that the current relative humidity U1 is lower than 60% and the current temperature T1 is basically stable, the control system looks up the saturated water vapor pressure temperature comparison table to obtain the saturated water vapor pressure corresponding to the relative humidity U0. c0 And the saturated water vapor pressure e corresponding to the relative humidity U1 c1 , and calculate the target humidity value U according to the following calculation formula b ,

[0035] U b =e c0 / e c1 *U0+a, a is 1-10%,

[0036] Stop drying and calculate the target humidity value U in the control system bThen keep drying until the current relative humidity is detected to be lower than the target humidity value U b Stop drying after that or delay drying.

[0037] The drying device includes a heater disposed in the food waste disposer, and the bottom of the inner barrel is heated by the heater to dry the contents in the inner barrel. The inner barrel space of the inner barrel is connected to the ambient air outside the body of the food waste disposer through a small hole or a small gap disposed in the food waste disposer, and the air pressure in the barrel space is equal to the ambient air pressure outside the body.

[0038] An exhaust fan is provided in the food waste disposer, and the exhaust fan is connected to the space inside the barrel through an exhaust channel. The exhaust fan provides negative pressure and extracts water vapor evaporated from the inner barrel. An air purifier is provided in the food waste disposer, and the space inside the barrel is connected to the air purifier through a first exhaust channel. The air purifier is connected to the exhaust fan through a second exhaust channel, and the airflow that has been filtered and purified is discharged from the food waste disposer through the exhaust fan. The thermometer and hygrometer are installed above the inner barrel, which is suitable for direct detection. The thermometer and hygrometer can also be installed in the exhaust channel connecting the inner space of the barrel and the air purifier, which is suitable for indirect detection.

[0039] When the atmospheric pressure remains basically unchanged, the relative humidity at a certain temperature is the ratio of absolute humidity to saturated humidity. As the temperature rises, the evaporation activity of water molecules intensifies, and the maximum water vapor content in the air, or the water vapor partial pressure, that is, the saturated humidity value will increase. Therefore, under the same water vapor content or water vapor partial pressure, the relative humidity will decrease as the temperature rises.

[0040] After the garbage in the inner barrel of the food waste disposer is dried, there is no additional water vapor discharged with the air flow, and the water vapor content in the discharged gas is basically close to the water vapor content in the ambient air.

[0041] The present invention adopts the national standard GB11605-89 "Humidity Measurement Method" to measure temperature and relative humidity, and uses the data of the saturated water vapor pressure table (0-100°C) under a standard atmospheric pressure condition in Appendix Table C1 provided in the national standard GB11605-89 as the database data of the saturated water vapor pressure temperature comparison table of the present invention. Based on the real-time measured ambient temperature and humidity and the real-time measured temperature and relative humidity of the detection point after the work is stabilized, the current target relative humidity value in this state is calculated as the standard for judging whether the garbage in the barrel has been dried.

[0042] In a feasible implementation manner, a method for determining drying of a food waste disposer is provided. Figure 1 As shown, the following steps are included:

[0043] A saturated water vapor pressure-temperature comparison table is stored in the control unit of the food waste disposer.

[0044] The saturated water vapor pressure temperature comparison table provides the saturated water vapor pressure values ​​corresponding to different temperatures under a standard atmospheric pressure condition. Figure 2-1 to Figure 2-3 As shown,

[0045] The drying step is started. At the detection point in the manifold or air duct of the food waste disposer for exhausting the airflow, the control unit dries the contents of the inner barrel through the drying device, and at the same time, the detection element set at the detection point continuously detects the detection point in real time. Temperature and relative humidity , the control unit simultaneously records the temperature T0 and relative humidity U0 detected by the detection element when the drying is started;

[0046] Calculation steps: After the initial heating stage and evaporation stage, the relative humidity at the detection point begins to slowly decrease. When the control unit detects that the current relative humidity at the detection point is equal to or less than 80%, the control unit records the current temperature T1 and the current relative humidity U1 obtained by the current detection, and then the control unit looks up the saturated water vapor pressure e corresponding to the temperature T0 from the saturated water vapor pressure temperature comparison table. c0 And the saturated water vapor pressure e corresponding to temperature T1 c1 , and calculate the current target humidity value U according to the following calculation formula b ,

[0047] U b =e c0 / e c1 *U0+a, a is 1-10%;

[0048] Wherein, a is a correction parameter, and a is adjusted and determined according to comprehensive errors such as measurement errors. When it is detected that the current temperature T1 has a temperature range of 35-80° C., a in the calculation formula is 3-8%.

[0049] Automatic determination step, after calculating the current target humidity value U b The control unit then compares the current relative humidity U1 with the current target relative humidity U b And according to the comparison results, the drying state of the food waste disposer and the working state of the drying device are automatically determined.

[0050] If the comparison result is U1>U b , the control unit automatically determines that the drying is not completed, and controls the drying device to continue drying.

[0051] If the comparison result is U1≤U b , the control unit automatically determines that the drying is completed, and the control unit controls the drying device to stop drying.

[0052] In a feasible implementation manner, in the automatic determination step, if the comparison result is U1≤U b The control unit controls the drying device to stop drying and perform a countdown cooling process, and stops the program after the countdown ends, thereby completing the drying process and drying the contents to a suitable state.

[0053] In a feasible implementation, a dynamic determination method is added to the automatic determination step. If the comparison result is U1>U b , then the control unit records the temperature T1 and relative humidity U1 currently re-detected every 1-30 minutes, and repeats the calculation step and the automatic determination step with the newly recorded temperature T1 and relative humidity U1. Specifically, in the automatic determination step, if the comparison result is U1>U b , then the control unit records the temperature T1 and the relative humidity U1 currently re-detected every 5-15 minutes, and then obtains the corresponding saturated water vapor pressure e from the saturated water vapor pressure temperature comparison table. c1 , and then substitute the calculation formula in the calculation step to recalculate the current target humidity value U b , and then take the target humidity value U b And the automatic determination step is repeated for the newly recorded relative humidity U1.

[0054] The dynamic determination method of the present invention adopts repeated detection, calculation and determination at intervals. The reason is that the temperature of the detection point is not constant. For example, the temperature of the detection point will continue to rise from the initial heating stage to the evaporation stage until it reaches the first thermal equilibrium state, and then stabilize for a period of time in the first thermal equilibrium state; until all the liquid water in the inner barrel is evaporated, the temperature of the detection point will gradually rise again until it reaches the second thermal equilibrium state. In the second thermal equilibrium state, the contents of the inner barrel are in a completely dried state.

[0055] In the drying stage after the evaporation stage, the temperature and relative humidity of the detection point are changing, that is, the detection point has different temperatures T1, different relative humidity U1 and different current target humidity values ​​U1 calculated at different times. b Therefore, judging whether the contents have been dried requires the temperature T1 at different time points, the different relative humidity U1, and the different corresponding current target humidity values ​​U calculated. b Multiple determinations are made to determine whether the contents of the inner barrel are in a dry state through a dynamic determination method.

[0056] Example

[0057] Step 1. Turn on the food waste disposer to start drying. When the disposer is turned on, the temperature T0 detected is 25°C and the relative humidity U0 is 80%.

[0058] Step 2. The food waste disposer heats and dries the inner barrel for a period of time. After the evaporation stage is completed, the relative humidity inside begins to drop significantly. For example, at a certain moment, the temperature T1 of the detection point is detected and recorded as 60°C and the relative humidity U1 is 40%.

[0059] Step 3. According to the saturated water vapor pressure temperature comparison table, the saturated water vapor pressure corresponding to temperature T0 and temperature T1 is: e c0 =3170Pa,e c1 =19940Pa; where a is 4%,

[0060] Step 4. Calculate the current target humidity value U when the temperature T1 is 60°C b

[0061] U b =e c0 / e c1 *U0+4%=3170 / changed to 19940*80%+4%=16.7%;

[0062] Compare the relative humidity U1 and the calculated current target humidity value U b ,

[0063] The relative humidity is U1 (40%) which is greater than the calculated current target humidity value U b (16.7%), which is consistent with “If the comparison result is U1>U b ", the control unit automatically determines that the drying is not completed, and the control unit controls the drying device to continue drying.

[0064] Step 5. Thereafter, steps 2 to 4 are repeated every 15 minutes. After repeated detection, recording, calculation and determination by the control unit, if the drying is still not completed, the drying process continues;

[0065] Step 6. At a certain moment, the control unit re-detects the temperature and humidity of the detection point according to the set interval time, and detects and records that the temperature T1 of the detection point is 71° C. and the relative humidity U1 is 11% at a certain moment.

[0066] According to the saturated water vapor pressure temperature comparison table, the corresponding saturated water vapor pressure ec1 = 32558 Pa when the temperature T1 is 71°C, where a is 4%.

[0067] The current target humidity value U is calculated when the temperature T1 is 71°C. b ,

[0068] U b =3170 / 32558*80%+4%=11.8%;

[0069] Compare the relative humidity U1 and the calculated current target humidity value U b ,

[0070] The relative humidity is U1 (11%) which is less than the current target humidity value U b (11.8%), which meets the judgment condition of "if the comparison result is U1≤Ub", the control unit automatically determines that the drying is completed, and the control unit controls the drying device to stop drying and enter the cooling step.

Claims

1. A method for determining whether a food waste disposer is dry, characterized in that: The following steps are included: A saturated water vapor pressure-temperature comparison table is stored in the control system of the food waste disposer. The saturated water vapor pressure-temperature comparison table provides the pressure values ​​of saturated water vapor corresponding to different temperatures under atmospheric pressure conditions. Start drying, the control system dries the contents of the inner barrel through the drying device, and at the same time directly or indirectly detects the temperature and relative humidity of the inner barrel space of the inner barrel in real time and continuously through the thermometer and hygrometer. After starting drying, the control system records the temperature T0 and relative humidity U0 at the starting point of drying. Calculate the target humidity value U b After detecting that the current relative humidity U1 is lower than 60% and the current temperature T1 is basically stable, the control system looks up the saturated water vapor pressure temperature comparison table to obtain the saturated water vapor pressure corresponding to the relative humidity U0. c0 And the saturated water vapor pressure e corresponding to the relative humidity U1 c1 , and calculate the target humidity value U according to the following calculation formula b , U b = e c0 / e c1 * U0 + a, where a is 1 - 10%, Stop drying and calculate the target humidity value U in the control system b Then keep drying until the current relative humidity is detected to be lower than the target humidity value U b Stop drying after that or delay drying.

2. The method for determining whether a food waste disposer is dry according to claim 1, wherein: The inner barrel space of the inner barrel is connected to the ambient air outside the body of the food waste disposer through small holes or small gaps arranged in the food waste disposer, and the air pressure in the inner barrel space is equal to the ambient air pressure outside the body.

3. The method for determining whether a food waste disposer is dry according to claim 1, wherein: An exhaust fan is provided in the kitchen waste disposer, and the exhaust fan is connected to the space in the barrel through the exhaust channel, and negative pressure is provided by the exhaust fan to extract water vapor evaporated from the inner barrel; An air purifier is arranged in the food waste disposer, the space in the barrel is connected to the air purifier through the first exhaust channel, the air purifier is connected to the exhaust fan through the second exhaust channel, and the filtered and purified airflow is discharged from the food waste disposer through the exhaust fan.

4. A method for determining the drying of a food waste disposer, characterized in that: The following steps are included: A saturated water vapor pressure-temperature comparison table is stored in the control unit of the food waste disposer. The saturated water vapor pressure temperature comparison table provides the saturated water vapor pressure values ​​corresponding to different temperatures under a standard atmospheric pressure condition. The drying step is started. At the detection point in the manifold or air duct of the food waste disposer for exhausting the airflow, the control unit dries the contents of the inner barrel through the drying device, and at the same time, the detection element set at the detection point continuously detects the detection point in real time. Temperature and relative humidity , the control unit simultaneously records the temperature T0 and relative humidity U0 detected by the detection element when the drying is started; Calculation steps: After the initial heating stage and evaporation stage, the relative humidity at the detection point begins to slowly decrease. When the control unit detects that the current relative humidity at the detection point is equal to or less than 80%, the control unit records the current temperature T1 and the current relative humidity U1 obtained by the current detection, and then the control unit looks up the saturated water vapor pressure e corresponding to the temperature T0 from the saturated water vapor pressure temperature comparison table. c0 And the saturated water vapor pressure e corresponding to temperature T1 c1 , and calculate the current target humidity value Ub according to the following calculation formula: U b = e c0 / e c1 * U0 + a, where a is 1 - 10%; Automatic determination step, after calculating the current target humidity value U b The control unit then compares the current relative humidity U1 with the current target relative humidity U b And according to the comparison results, the drying state of the food waste disposer and the working state of the drying device are automatically determined. If the comparison result is U1>U b , the control unit automatically determines that the drying is not completed, and controls the drying device to continue drying. If the comparison result is U1≤U b , the control unit automatically determines that the drying is completed, and the control unit controls the drying device to stop drying.

5. The method for determining whether a food waste disposer is dry according to claim 4, characterized in that: The automatic determination step, If the comparison result is U1>U b , then the control unit records the temperature T1 and the relative humidity U1 currently re-detected every 1-30 minutes, and repeats the calculation step and the automatic determination step in sequence with the newly recorded temperature T1 and relative humidity U1.

6. The method for determining whether a food waste disposer is dry according to claim 4, wherein: The automatic determination step, If the comparison result is U1>U b , then the control unit records the temperature T1 and the relative humidity U1 currently re-detected every 5-15 minutes, and then obtains the corresponding saturated water vapor pressure e from the saturated water vapor pressure temperature comparison table. c1 , and then substitute the calculation formula in the calculation step to recalculate the current target humidity value U b , and then take the target humidity value U b And the automatic determination step is repeated for the newly recorded relative humidity U1.

7. The method for determining whether a food waste disposer is dry according to claim 4, wherein: The automatic determination step, If the comparison result is U1≤U b The control unit controls the drying device to stop drying and perform a countdown cooling process, and stops the program after the countdown ends, thereby completing the drying process and drying the contents to a suitable state.

8. A method for determining drying of a food waste disposer according to any one of claims 4 to 7, characterized in that: The drying device includes a heater disposed in the food waste disposer, and the bottom of the inner barrel is heated by the heater to dry the content in the inner barrel.

9. The method for determining whether a food waste disposer is dry according to claim 8, wherein: When it is detected that the current temperature T1 is in the range of 35-80° C., a in the calculation formula is 3-8%.

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