JP2016090158A - Water supply control method for tea manufacturing boiler, and tea manufacturing boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for performing reliable water supply control while reducing a water supply by decreasing water supply time per time in order to avoid an extreme drop in water temperature in a tea manufacturing boiler.SOLUTION: A water supply control method for a tea manufacturing boiler includes control for performing a water supply so as to reach a designated water level while monitoring a water level in a tea manufacturing boiler. During the control, a first means sets a water supply upper limit time and performs a water supply so as not to exceed the water supply upper limit time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to control of water supply for a tea boiler for supplying steam to a tea steamer, and to a tea boiler equipped with the control.

  In order to inactivate the oxidase of fresh tea leaves, in the production of green tea, steam at normal pressure is supplied to a tea making machine. This steam is generated by a tea boiler, and a steam flow meter is provided to quantitatively send the steam to a tea steamer.

  In order to send the steam quantitatively to the tea steamer, the tea boiler also controls the water supply. For this water supply control, for example, as described in Patent Document 1 (particularly, conventional technology), a water level adjusting device is provided, and a plurality of electrode rods are provided therein, so that water does not touch the electrode rods at a specified water level. In this case, the water supply is continued until the water touches the electrode rod at the specified water level, and the water supply ends when the water touches. Then, when water does not touch the electrode rod at the designated water level again, water is supplied again, and when water touches the electrode rod at the designated water level, the water supply ends. This was repeated.

No. 6-45129

  In the case of controlling whether or not to touch a conventional electrode rod, the water surface in the tea-making boiler may be shaken and it may be difficult to touch the electrode of the water level adjusting device. If it does so, one water supply time will become long, the amount of water supply will also increase, the temperature of the water in a tea boiler will fall, and the fall of the amount of steam generation will be caused. In particular, when the air temperature and water temperature are low, this influence becomes large.

  Even if you try to avoid a decrease in the amount of steam generated due to an increase in the water supply time and increase in the water supply amount, you are actually requesting water supply. Water supply is required.

  The present invention provides a method for performing reliable water supply control while shortening one water supply time and reducing the water supply amount so as not to extremely lower the temperature of water in a tea boiler. Is an issue.

The first means of the present invention is to monitor the water level in the tea-making boiler, set the water supply upper limit time in the control to supply water so as to reach the designated water level, and perform water supply so as not to exceed the water supply upper limit time. A feature of the water supply control method for tea boilers.
In the second means of the present invention, in the first means, an average of water supply time is calculated, and the average water supply time is set as the water supply upper limit time.
According to a third means of the present invention, in the first or second means, a water supply stop lower limit time is set in advance, and the water supply is stopped for at least the water supply stop lower limit time.
According to a fourth means of the present invention, in the first, second or third means, the water supply upper limit time is compared with the actual water supply time, and the fifth means of the present invention for changing the water supply upper limit time is the first In 2, 3, or 4 means, the water supply stop lower limit time is compared with the actual water supply stop lower time to change the water supply stop lower limit time.
According to a sixth aspect of the present invention, there is provided a tea boiler comprising the water supply control method for the tea boiler according to the first, second, third, fourth or fifth means.

  According to the present invention, since the water supply time for one time is short, the temperature of the water in the tea-making boiler is not drastically lowered, and high-quality steam can be stably generated and supplied. In addition, since the temperature of the water in the tea boiler is not drastically lowered, the amount of heat for generating steam can be stabilized, leading to energy saving.

FIG. 1 is an explanatory diagram showing a method of supplying steam from a tea boiler to a tea steamer. FIG. 2 is a side view of a tea boiler. FIG. 3 is an explanatory view showing an implementation method of a water level detection device for a tea boiler. FIG. 4 is an explanatory view showing an example of a control panel of a tea boiler. FIG. 5 is an explanatory view showing an example of a conventional control method for a tea boiler. FIG. 6 is an explanatory view showing an example of a method for controlling a tea boiler. FIG. 7 is an explanatory view showing an example of a method for controlling a tea boiler. FIG. 8 is an explanatory view showing an example of a method for controlling a tea boiler. FIG. 9 is an explanatory view showing an example of a method for controlling a tea boiler. FIG. 10 is an explanatory view showing a result without water supply control of a tea boiler. FIG. 11 is an explanatory view showing the result of the tea boiler with water supply control.

  In the production of green tea, the tea steamer 10 inactivates the oxidase of fresh tea leaves. A transport device (not shown) is provided before and after the tea-making machine 10, and fresh tea leaves are continuously fed in and tea leaves inactivated by oxidase are continuously taken out. Steam generated by the tea boiler 1 is supplied to the tea steamer 10 via the steam pipe 8. In order to stabilize the steaming degree of fresh tea leaves, it is necessary to supply this steam quantitatively to the tea making machine 10. For this reason, the tea boiler 1 has a steam pool 7, which is provided with a steam flow meter 8A, a control panel 9 and the like.

  In the tea boiler 1, when the control panel 9 (see FIG. 4) is turned on and automatically controlled, water supply is automatically performed and heating by the burner 3 </ b> A in the combustion furnace 3 is performed automatically. In order to secure the amount of steam generation required by the steam flow meter 8A, steam is generated while making the burner 3A high and low. These automatic control states are set and displayed on the control panel 9.

  The basic water supply to the tea boiler 1 is automatic water supply control, which is performed by the water level detection device 5 with the automatic water supply control switch 9C on the control panel 9 set to “ON” (see FIG. 5). Electrodes 5 </ b> A to 5 </ b> E are disposed in the water level detection device 5, and the water W of the box 2 of the tea boiler 1 is drawn into the water level detection device 5. The water level of the water W of the box 2 of the tea boiler 1 and the water level of the water w of the water level detection device 5 are the same. Each of the electrodes 5A to 5E has a different length, recognizes the water level depending on which electrode the water w touches and does not touch, and sends the signal through the signal line 5F. This water level can be set by a water level dial 9E on the control panel 9. The long electrode 5A is drought, the next long electrode 5B is at the water level 1, and the specified water level increases as the electrode becomes shorter. If it is not the water level designated by the water level dial 9E (designated water level), water is supplied, and if it reaches the designated water level (designated water level), the water supply is terminated. This is a repetition. If the water supply becomes insufficient, the tea boiler 1 will be empty, so it is important that the water supply is not insufficient.

  Next, fine control is performed according to the water supply time. When the control panel 9 is turned on, one water supply time in the automatic water supply control is measured. In this embodiment, the water supply time is measured 10 times, and the average water supply time of 10 times is calculated and calculated (the average is measured 10 times in the present embodiment, but may be 5 times or 20 times). . In this example, it was 7.6 seconds. This is the initial value of the water supply upper limit time in the water supply time control. Next, the water supply stop lower limit time is set to 5 seconds in advance.

  The water supply time control is set to “ON” at the water supply time control ON / OFF section 9G of the touch panel 9F on the control panel 9. Basically, the water level is compared with the designated water level. If the water level is the designated water level, the water supply is stopped, and if the water level is not the designated water level, the water is supplied until the designated water level is reached. If the water level reaches the designated water level before the water supply upper limit time is reached, the count B is counted. The above is repeated until the count B reaches 5, and when the repetition reaches 5 times, it is determined that the water supply is excessive, and the water supply upper limit time is set to 0.5 depending on whether the water supply stop lower limit time is longer or shorter than 5 seconds. Change the subtraction of seconds or the addition of 0.5 seconds to the lower limit of water supply stop time. In the case of the initial value of the present embodiment, the water supply upper limit time is changed to 7.1 seconds, or the water supply stop lower limit time is changed to 5.5 seconds. Then, the count B is reset, and it is compared again whether or not the water level has reached the designated water level, and if not, water is supplied.

  If the water level reaches the upper limit time before the water level becomes the specified water level, the water supply is stopped and the water supply is stopped until the lower limit time elapses. At this time, the count A is counted. When the count A reaches four times, it is determined that water supply is insufficient, and water is supplied to the designated water level promptly regardless of the water supply time. And it changes by adding 0.5 second of water supply upper limit time and subtracting 0.5 second of water supply stop lower limit time. In the case of the initial value of this embodiment, the water supply upper limit time is changed to 8.1 seconds, and the water supply stop lower limit time is changed to 4.5 seconds. Unlike the initial value of the present embodiment, when the result is that the water supply stop lower limit time becomes 0 seconds, the water supply time control is once ended, the water supply time by the automatic water supply control is measured again, and the average of 10 times is calculated. Then, set the water supply time upper limit time and reset the water supply stop lower limit time to 5 seconds. Then, the water supply time control is started again. If the lower limit of the water supply stop time is not 0 seconds, all the counts A are reset, and it is compared again whether or not the water level has reached the designated water level, and if not, water is supplied.

  Even if the count A does not become four times, if three times is three times in succession, it is determined that water supply is insufficient as described above, and water is supplied promptly to the specified water level regardless of the water supply time. And the water supply upper limit time and the water supply stop lower limit time are changed. When the count A is other than that, it is compared whether or not the water level has reached the specified water level without changing the upper limit time for water supply or the lower limit time for stopping water supply, and water is supplied until the water level reaches the specified water level.

  The count A is reset when the water level reaches the designated water level, and the count B is reset when the water level does not reach the designated water level.

  The result without water supply time control is shown in FIG. 10, and the result with water supply time control is shown in FIG. In the case of no water supply time control, the water supply time was short (about 1 second) or long (30 seconds or more). If the water supply time is very long, the temperature of the water in the box 2 of the tea boiler 1 becomes low, and the burner 4 which has been low in combustion must be made high in combustion. However, when there is water supply time control, a long water supply time can be suppressed while securing a water supply amount, the temperature of the water in the box 2 of the tea boiler 1 is not extremely lowered, and the amount of steam generated Shortage can be prevented.

  The numerical values described in the present embodiment (the number of times of obtaining the average, the predetermined water supply stop lower limit time, the number of cycles, the addition time, the subtraction time, etc.) are merely examples, and are not limited to these numerical values. In addition, how to change the water supply upper limit time or the water supply stop lower limit time when comparing the water supply time with the water supply upper limit time and comparing the water supply stop time with the water supply stop lower limit time is merely an example. Is not limited. Other methods may be used as long as the water supply time and the water supply upper limit time are compared, the water supply stop time and the water supply stop lower limit time are compared, and the water supply upper limit time and the water supply stop lower limit time can be changed.

DESCRIPTION OF SYMBOLS 1 Tea boiler 2 Box 3 Combustion furnace 3A Burner 4 Water pipe 5 Water level detection device 5A Electrode 5B Electrode 5C Electrode 5D Electrode 5E Electrode 5F Signal line 6A Connection pipe 6B Connection pipe 7 Steam pool 8 Steam pipe 8A Steam flow meter 9 Control board 9A Power switch 9B Burner switch 9C Water supply automatic control switch 9D Leaf feeder control switch 9E Water level dial 9F Touch panel 9G “Water supply time control on / off” section 9H Low fuel lamp 9I High fuel lamp 9J Misfire lamp 9K Water supply lamp 9L Insufficient steam flow Lamp 10 Tea Steamer W, w Water

Claims (6)

  Water supply control for a tea boiler characterized by monitoring the water level in a tea boiler and supplying water so that it reaches a specified water level, and setting a water supply upper limit time so that the water supply does not exceed the water supply upper limit time. Method.   The water supply control method for a tea boiler according to claim 1, wherein an average water supply time is calculated, and the average water supply time is set as the water supply upper limit time.   3. A water supply control method for a tea boiler according to claim 1 or 2, wherein a water supply stop lower limit time is set in advance and water supply is stopped at least for a water supply stop lower limit time or more.   The water supply control method for a tea boiler according to claim 1, wherein the water supply upper limit time is compared with an actual water supply time, and the water supply upper limit time is changed.   5. The water supply control method for a tea boiler according to claim 1, wherein the water supply stop lower limit time is changed by comparing the water supply stop lower limit time with an actual water supply stop time.   6. A tea boiler comprising the tea boiler water supply control method according to claim 1, 2, 3, 4 or 5.

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