JP3935612B2 - Retort sterilizer with self-diagnosis system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retort sterilizer used when cooking and sterilizing retort foods, pharmaceuticals, etc. under pressure or normal pressure, and has a self-diagnosis function.
[0002]
[Prior art]
Conventionally, in order to check whether the device is normal, before starting production, no load operation is performed without putting a product, and whether the device is operating normally is compared with normal operation on recording paper. I was checking to see if there was any.
[0003]
[Problems to be solved by the invention]
However, the conventional inspection method described above is a no-load operation, so it is necessary to check the utility supply capacity when the load is used during production and the capacity of the heat exchanger that determines the heating and cooling capacity. I can't.
[0004]
In addition, since the operator checks on the recording paper, it is not possible to confirm the fine difference from the normal time, and it is a sign of malfunction of the processing tank can, valve or pump malfunction, controller or sensor electrical equipment, etc. Oversight, sterilization failure and product failure due to malfunction of valves and pumps, poor ability to supply utilities to processing tanks, poor controllers and sensors.
[0005]
Recently, management for the retort sterilizer to normally function and perform is performed as GMP (Good Manufacturing Practice), and GMP is a premise of HACCP (sanitary management by risk analysis). A retort sterilizer with a clear management standard and a specific management method realizes rational implementation of GMP and HACCP without excess or deficiency.
[0006]
The present invention can make HACCP implementation surely and easy by adding a self-management function by diagnosis that can easily check the normal state of function and performance without introducing an excessive measurement system and management system. An object of the present invention is to provide a retort sterilizer with a self-diagnosis system.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a processing tank for loading an object to be processed, a means for supplying water to the processing tank, a circulation pump for circulating the processing fluid to the processing tank, and a processing fluid supplied by the circulation pump.・ Cooling heat exchanger, means for switching and supplying steam and cooling water to the heat exchanger, means for introducing pressurized air into the processing tank, means for exhausting from the processing tank, and discharging the processing fluid from the processing tank Each means is automatically controlled by a normal operation program set by a reference recipe adapted to the object to be processed, and the object to be processed is heated and pressurized with a processing fluid under pressure or normal pressure for a predetermined time. In a retort sterilizer that has been cooked, sterilized and sterilized at a predetermined temperature, and then cooled down to a predetermined temperature and a predetermined pressure, the state of the entire apparatus is executed by executing a preset self-diagnosis mode. Inspection and, if any defective portion, to identify its location, is obtained by including a self-diagnostic system for displaying.
[0008]
The self-diagnostic mode includes a temperature rise program, a temperature fall program, a boost program, and a step-down program. During the execution of these programs, the temperature and pressure in the treatment tank are measured and compared with a reference value for self-diagnosis. It is a thing.
[0009]
In the present invention, the F value (sterilization evaluation integrated value expressed as a function of temperature and time) is calculated from the measured value of the temperature in the self-diagnosis mode, and the temperature near the heating temperature of the reference recipe of the workpiece is calculated. It has items to self-diagnose sterilization and sterilization conditions.
[0010]
The reference value data of the self-diagnosis mode is the standard data registration operation of the self-diagnosis mode is executed when the device is in a normal state, and the “temperature”, “pressure”, and “time” at normal time are set at regular intervals. It is automatically sampled and stored in the sequencer.
[0011]
The items to be checked in the self-diagnosis mode are at least (1) that the valves and pumps are operating normally, (2) that there are no leaks in the valves and heat exchanger, and (3) the heat exchanger transmission. Normal heat capacity, (4) Utility (hot water / cooling water, etc.) supply capacity is sufficient, (5) Electricity and instrumentation are in normal condition, (6) Manual valve open Including the fact that the degree is appropriate and (7) that the strainer and silencer are not clogged. Compare these normal states based on the measured values and the reference values, and check the total heat history at the reference heat at the end of operation. It is automatically checked by comparing with the history, and if there is a difference in the matching result, the corresponding defective part is specified and displayed.
[0012]
Since the present invention is configured as described above, if the self-diagnosis mode is executed before the start of production, the signs of malfunctions and malfunctions of each component are automatically compared with the reference values, and if there is no difference in the results. Since it can be confirmed that the apparatus is normal, it is possible to prevent sterilization defects and product defects due to defects of each component.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall flow sheet of a retort sterilization apparatus targeted by the present invention. Water is used as a processing fluid, and this water is heated and cooled to heat cook, sterilize, sterilize and cool the workpiece. The case of a water spray type retort sterilizer is illustrated.
[0014]
In FIG. 1, 1 is a treatment tank for an object to be treated, 2 is a circulation pump that circulates and supplies water as a treatment fluid to the treatment tank 1, 3 is a heat exchanger that heats and cools water supplied by the circulation pump 2, 4 Is a means for supplying steam to the heat exchanger 3, 5 is a means for supplying cooling water to the heat exchanger 3, 6 is a means for introducing pressurized air to the treatment tank 1, 7 is an means for exhausting from the treatment tank 1, and 8 is a treatment means. The drainage means from the tank 1 is shown.
[0015]
The processing tank 1 includes a heat-resistant / pressure-resistant container, and includes a plurality of shelves on which the objects to be processed are placed, and spray nozzles 1a for injecting hot water or cold water onto the objects to be processed placed on the shelves. A large number of shelves are installed, and an openable / closable lid 1b is attached to one end. The lid 1b is configured to be hermetically sealed by packing when the processing tank 1 is closed.
[0016]
The circulation pump 2 first supplies the water supplied via the water supply path 9 a of the water supply means 9 through the heat exchanger 3 to the spray nozzle 1 a of the treatment tank 1 from the supply path 2 a and accumulates at the bottom of the treatment tank 1. Water is drawn out through the drawing path 2b and circulated and supplied to the spray nozzle 1a of the treatment tank 1 through the heat exchanger 3 again. A gate valve 2c is installed in the supply path 2a. A water supply valve 9b is installed in the water supply path 9a.
[0017]
The heat exchanger 3 is for heating and cooling the water supplied by the circulation pump 2 with the steam or cooling water supplied by the steam supply means 4 or the cooling water supply means 5.
[0018]
The steam supply means 4 supplies steam to the heat exchanger 3 through the steam supply path 4a from the boiler, exchanges heat with water, and then discharges from the waste steam path 4b via the drainage path 8a of the drainage means 8. Is done. The steam supply path 4a is provided with a temperature control steam valve 4c for adjusting the supply amount. Further, a steam trap valve 4d and a steam trap 4e are installed in the waste steam path 4b.
[0019]
The cooling water supply means 5 supplies cooling water from the cooling tower to the heat exchanger 3 through the cooling water supply path 5a, exchanges heat with water, and then is discharged to the return path 5b to the cooling tower. A water supply pump to the cooling tower is installed in the return path 5b. A temperature control cooling valve 5c for adjusting the supply amount is installed in the cooling water supply path 5a, and a cooling water outlet valve 5d is installed in the return path 5b. Further, a bypass path 5e for returning excess cooling water is connected between the cooling water supply path 5a and the return path 5b, and a cooling water bypass valve 5f is provided in the middle.
[0020]
The pressurized air introduction means 6 is for introducing pressurized air from the compressor to the treatment tank 1 through the pressurized air introduction path 6a. The pressurized air introduction path 6a is opened when the treatment tank 1 is pressurized. In addition, a pressurizing valve 6b that is closed in other cases is provided.
[0021]
The exhaust means 7 is used when releasing the pressurization of the processing tank 1, and includes an exhaust path 7c provided with an air vent valve 7a and a silencer 7b.
[0022]
The drainage means 8 is for discharging the liquid accumulated at the bottom in the processing tank 1 from the drainage path 8a, and is provided with a drainage valve 8b that is opened when draining.
[0023]
In FIG. 1, 9 c is a mechanical cooling water path for cooling the circulation pump 2 branched from the water supply means 9, and a mechanical cooling water valve 9 d is installed. Reference numeral 10 denotes a means for ensuring the airtightness of the lid 1b of the processing tank 1, and is provided with a vacuum ejector 10a and a lid packing tightening valve 10b. Furthermore, 11 is an air release valve, 12 is a liquid level indicator that displays the amount of liquid accumulated in the bottom of the processing tank 1, 13 is a liquid level detector in the processing tank 1, 14 is a temperature detector in the processing tank 1, 15 Indicates a pressure detector in the processing tank 1.
[0024]
FIG. 2 is an explanatory view showing the configuration of the main part of the present invention, in which 16 is a temperature / pressure controller, 17 is a sequencer, 18 is a display, and the temperature / pressure controller 16 is a normal operation commanded from the sequencer 17. According to the program and the program in the self-diagnosis mode, the pressurization valve 6b of the pressurized air introduction means 6 and the air vent valve 7a of the exhaust means 7 are controlled to open and close, and the temperature control steam valve 4c of the steam supply means 4 and the cooling water supply means The supply amount of the temperature control cooling valve 5c is controlled.
[0025]
The sequencer 17 sets and stores a normal operation program and a program in the self-diagnosis mode, and the normal operation program is set by a reference repeat suitable for the workpiece. The programs in the self-diagnosis mode include a temperature increase program Ta, a temperature decrease program Tb, a step-up program Pa, and a step-down program Pb as shown in FIG. 3, which may be manually set in advance, In the normal state, the reference data registration operation in the self-diagnosis mode is executed, and the “temperature”, “pressure”, and “time” in the processing tank 1 at the normal time are set at regular time intervals (for example, every 10 seconds). Or may be automatically sampled and stored in the sequencer 17 for setting.
[0026]
The sequencer 17 receives the data transmitted from the temperature detector 14 and the pressure detector 15 in the processing tank 1 for the temperature and pressure of the processing tank 1 and stores them with time, and in the self-diagnosis mode. During the operation, the setting data or the reference data is collated with the actual measurement value, and if there is a difference exceeding the allowable range, the abnormality is displayed on the display unit 18 together with the abnormal part.
[0027]
Further, the temperature / pressure controller 16 receives data detected and transmitted from the temperature detector 14 and the pressure detector 15 in the processing tank 1 to ensure feedback control of the program, and from the temperature by the calculation means 16a. A function of calculating the F value and transmitting it to the sequencer 17 is provided. On the other hand, the sequencer 17 stores the F value that is set in advance or obtained by the reference data registration operation in the self-diagnosis mode, compares this with the actually measured F-value at the time of self-diagnosis, and exceeds the allowable range. If there is, an abnormality is displayed on the display 18.
[0028]
Next, a self-diagnosis system in the device of the present invention will be described with reference to FIG. The self-diagnosis system of the present invention includes the following first to ninth steps.
[0029]
First step:
Check the pressure line. The check items are pressure system confirmation and boosting capacity confirmation, which are compared with the reference time. Specifically, it is to confirm from the measured value of the pressure detector 15 that the opening / closing operation of the pressurizing valve 6b of the pressurized air introduction path 6a is normal and that pressurized air of a predetermined pressure is supplied. .
[0030]
Second step:
Check for leaks. The airtightness of the processing tank 1 is confirmed, and the leakage of the heat exchanger 3 and the pressurized air introduction path 6a, the exhaust path 7c, the drainage path 8a, and the water supply path 9a is confirmed from the measured values of the pressure detector 15.
[0031]
Third step:
Check the exhaust line. The check items are the exhaust capacity confirmation, whether the air vent valve 7a in the exhaust path 7c is operating normally, whether the silencer 7b is clogged, and whether the air release valve 11 is operating normally It is confirmed by comparing the actual measurement value of the pressure detector 15 with the reference data.
[0032]
Fourth step:
Check the water supply line. After confirming that the liquid level L of the liquid level detector 13 of the processing tank 1 is ON, water is supplied from the water supply path 9a, and the time until the liquid level M is turned ON is compared with the reference time and is normal. That is, it is confirmed whether the water supply path 9a and the water supply capacity are normal.
[0033]
5th step:
In order to confirm the temperature raising capability of the sixth step, preheating is performed in advance for the purpose of aligning the preheating and the initial temperature of the treatment tank 1 in advance. Whether or not the circulation pump 2, the heat exchanger 3 and the steam supply path 4a are normal is confirmed by comparing the measured value of the temperature detector 14 with a reference value.
[0034]
Step 6:
Check temperature rise and pressure. Whether or not the circulation pump 2, the heat exchanger 3, the pressurized air introduction path 6a, and the steam supply path 4a are normal is confirmed by comparing measured values of the temperature detector 14 and the pressure detector 15 with reference values.
[0035]
Step 7:
Check constant temperature and pressure. The temperature detector 14 and pressure detection are performed to determine whether the circulation pump 2, the heat exchanger 3, the pressurized air introduction path 6a, and the steam supply path 4a are normal by increasing the temperature and pressure corresponding to the reference recycle of the workpiece. This is confirmed by comparing the measured value of the container 15 with the reference value.
[0036]
Step 8:
Perform temperature drop and step-down checks. Whether or not the circulation pump 2, the heat exchanger 3, and the cooling water supply path 5a are normal is confirmed by comparing the measured values of the temperature detector 14 and the pressure detector 15 with reference values.
[0037]
Ninth step:
Check the drainage. Whether or not the drainage path 8a is normal is based on the time from when the drainage valve 8b is opened and the liquid level M in the processing tank 1 is turned off until the liquid level L is turned off. Compare drainage capacity with time. Finally, the total heat history is compared with the reference total heat history, and in particular, the actual F value at the time of self-diagnosis and the reference F value are compared and displayed from the heat history centered on the seventh step.
[0038]
In the present invention, the operation program of the operation procedure of each component for executing the first to ninth steps is registered in the sequencer 17 together with the normal operation mode as a self-diagnosis mode, and is selected by the operation mode selection switch. And let it run automatically.
[0039]
The above self-diagnosis is performed to check whether or not the device operates normally. When self-diagnosis is necessary (during the start-up inspection before production, etc.), the self-diagnosis operation is executed, and "temperature" The actual value of “time” is checked against the reference value of the reference registration data, and if there is a difference, an abnormality is notified.
[0040]
During the self-diagnosis operation, the set value of “Temperature” and “Pressure” is compared with the measured value, and when the set deviation is exceeded, an abnormality is notified. (The reference value data is, for example, data every 10 seconds, and the interval between the verification points is monitored with a deviation from the set value.)
Also, at the end of cooling, it is checked against the reference value of the total heat history, and if there is a difference, it is reported as abnormal. Then, the abnormal part is specified by the process in which the abnormality has occurred and the content of the abnormality and displayed on the display 18.
[0041]
In short, the present invention automatically picks up the conditions necessary for normal operation in all the components constituting the apparatus and the operation state, and executes the above process to automatically and quickly confirm that they are in a normal state. It is configured so as to be confirmed.
[0042]
In the present invention, “reference data” is collected from an operation under a condition where the apparatus is actually used, and used as a reference value. Compare the measured value of the operation data during the self-diagnosis operation with the reference value to check the normal state of the device. In order to determine the normal state, an allowable value of the difference between the reference value and the measured value is set as a reference deviation, and whether the measured values of temperature, pressure, and time are within the reference deviation is monitored. If the difference between the reference value and the measured value exceeds the reference deviation, a deviation is reported as an abnormality.
[0043]
In particular, the present invention monitors the reproducibility of the temperature near the heat sterilization temperature by the difference between the temperature reference value and the temperature measurement value, and at the same time, the F value (sterilization evaluation integrated value) obtained from the temperature and time, Compare and monitor. By the F value, a subtle temperature shift near the heating temperature can be enlarged and expressed. By comparing the reference F value obtained in normal operation with the F value in self-diagnosis operation, reliable monitoring of temperature reproducibility becomes easy.
[0044]
Main parts to be inspected and inspection contents in the present invention are as follows.
[0045]
Circulation pump 2 must operate normally. The discharge pressure is within the allowable range and there is no mechanical leakage.
[0046]
The pump (not shown) of the water supply means 9 operates normally. The discharge pressure is within the allowable range.
[0047]
The cooling tower (not shown) operates normally, and the water pump (not shown) to the cooling tower operates normally. The discharge pressure is within the allowable range.
[0048]
The heat exchanger 3 has a normal heat transfer capability. There are no leaks.
[0049]
The opening / closing operation of the pressurizing valve 6b is normal. There are no leaks.
[0050]
The opening / closing operation of the air vent valve 7a is normal. There are no leaks.
[0051]
The opening / closing operation of the air release valve 11 is normal. There are no leaks.
[0052]
The opening / closing operation of the drain valve 8b is normal. There are no leaks.
[0053]
The opening / closing operation of the water supply valve 9b is normal. There are no leaks.
[0054]
The temperature control steam valve 4c operates normally.
[0055]
The temperature control cooling valve 5c operates normally.
[0056]
The opening / closing operation of the coolant bypass valve 5f is normal.
[0057]
The opening / closing operation of the mechanical cooling water valve 9d is normal.
[0058]
The temperature detector 14, the pressure detector 15 and the temperature / pressure controller 16 are normal.
[0059]
The operation of the sequencer 17 is normal.
[0060]
【The invention's effect】
According to the present invention, if the self-diagnosis mode is executed before the start of production, the signs of malfunctions and malfunctions of each component are automatically compared with the reference value. Since it can be confirmed that there is a sterilization failure or product failure due to a failure of each component, it can be prevented beforehand.
[0061]
Further, according to the present invention, the reproducibility of the temperature in the vicinity of the cooking, sterilization and sterilization temperature of the workpiece can be clearly confirmed by comparing the measured value of the F value with the reference value.
[Brief description of the drawings]
FIG. 1 is an overall flow sheet of a retort sterilizer targeted by the present invention.
FIG. 2 is an explanatory diagram showing a main configuration of the present invention.
FIG. 3 is a graph showing a state of a temporal change in temperature and pressure in the self-diagnosis mode in the present invention.
[Explanation of symbols]
1 is a treatment tank, 2 is a circulation pump, 3 is a heat exchanger, 4 is a steam supply means, 4c is a temperature control steam valve, 5 is a cooling water supply means, 5c is a temperature control cooling valve, and 6 is a pressurized air introduction means. , 6b is a pressurizing valve, 7 is an exhaust means, 7a is an air vent valve, 8 is a drain means, 8b is a drain valve, 9 is a water supply means, 9b is a water supply valve, 9d is a mechanical cooling water valve, and 10 is an airtightness check. Means, 11 is an air release valve, 12 is a liquid level gauge, 13 is a liquid level detector, 14 is a temperature detector, 15 is a pressure detector, 16 is a temperature / pressure controller, 17 is a sequencer, and 18 is a display.

Claims (3)

A processing tank for loading an object to be processed, means for supplying water to the processing tank, a circulation pump for circulating and supplying a processing fluid to the processing tank, a heat exchanger for heating and cooling the processing fluid supplied by the circulation pump, and heat exchange Means for switching and supplying steam and cooling water to the vessel, means for introducing pressurized air into the treatment tank, means for exhausting from the treatment tank, and means for discharging the treatment fluid from the treatment tank,
The above-mentioned means are automatically controlled and added to the workpiece by a normal operation program set in accordance with the reference recipe adapted to the workpiece, that is, the temperature, pressure and time reference processing conditions (hereinafter referred to as the reference recipe). In a retort sterilizer that is heated and pressurized with a processing fluid under reduced pressure or normal pressure, heated and sterilized and sterilized at a predetermined temperature for a predetermined time, and then cooled down to a predetermined temperature and a predetermined pressure. ,
Run a self-diagnosis mode set in advance to check the status of the entire device, and if there is a defective part, it is equipped with a self-diagnosis system for identifying and displaying the part ,
The self-diagnosis mode includes a temperature raising program, a temperature lowering program, a boosting program, and a step-down program. During execution of these programs, the temperature and pressure in the processing tank are measured and compared with a reference value for self-diagnosis. Is,
Self-diagnostic mode reference value data is automatically stored at regular time intervals for temperature, pressure, and time during normal operation when the device is in a normal state. A retort sterilizer with a self-diagnosis system characterized in that it is sampled and stored in a sequencer .   2. An item for self-diagnosis of sterilization / sterilization conditions near the heating temperature of a reference recipe of the object to be processed by calculating an F value from a measured value of temperature in the self-diagnosis mode. Retort sterilizer with self-diagnosis system. The items to be checked in the self-diagnosis mode are at least (1) that the valves and pumps are operating normally, (2) that there are no leaks in the valves and heat exchanger, and (3) the heat transfer capability of the heat exchanger. (4) Sufficient utility supply capacity, (5) Electricity and instrumentation are in a normal state, (6) Opening of the manual valve is appropriate, (7) Strainer and wherein the absence clogged silencer, these normal state verification compared based on the measured value and the reference value, also automatically checked against compared with a reference thermal history the aggregate thermal history during the operation ends The retort sterilizer with a self-diagnosis system according to claim 1 or 2 , wherein if there is a difference in the collation result, the corresponding defective part is specified and displayed.

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