JP3075004B2 - Gas shut-off device with adjacent section learning function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off device for automatically shutting off a gas passage when an abnormality occurs, thereby preventing an explosion accident, a poisoning accident or the like caused by city gas, propane gas or the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional gas shut-off device of this type includes a gas meter 2 in one gas supply line.
And a flow rate measuring means 3 for emitting a signal in accordance with the amount of gas passing through the gas meter, and a shutoff means 4 for stopping the supply of gas. A control unit 5 which determines that an abnormality has occurred when the stored continuous use allowable time condition of the gas is deviated and issues a shut-off signal to the shut-off means 4 is provided.

FIG. 5 shows an example of the configuration of this conventional control unit.
Components having the same numbers as those in FIG. 4 are components having the same functions. A control unit 5 for calculating a calorific value per unit time of the gas meter passing gas amount based on a signal from the flow rate measuring means 3; a gas calorific value class obtained by dividing the calorific value into a plurality in advance; A division determining unit 7 for determining which one of the groups belongs to, an initial continuous use allowable time setting unit 8 for setting an allowable time that can be continuously used in advance in accordance with the classification determined by the classification determination unit 7, and the arithmetic unit 6. The continuous use time judging section 9 which compares the continuous use time after the gas of the calorific value calculated in 6 starts to flow and the permissible continuous time, and outputs a cutoff signal when the former exceeds the latter, counts a predetermined period. A timer 11, activation signal applying means 12 for activating the timer 11, and a use state storage unit 1 for storing a maximum value of each continuous use time of each heat generation amount section during the operation of the timer 11;
3, a continuous use allowable time changing unit 14 that changes the allowable time in the continuous use time determination unit 9 according to the information in the use state storage unit 13. The shutoff means 4 for shutting off the gas passage in response to the shutoff signal closes the gas passage (JP-A-63-108118).

[0004]

However, in the above-described configuration, the number of water heaters of proportional control has increased in recent years, and the calorific value category has transitioned due to a load change of the water heater in accordance with a change in water temperature in a season. In the transitioned calorific value classification, there is no corresponding combustor from the beginning, and the continuous use allowable time remains at the low allowable time setting of the initial set value, so that there is a problem that a false cutoff or a false alarm is caused.

[0005] Therefore, the gas shut-off device of the present invention solves the conventional problems, and erroneous shut-off at the transitional heating value category,
The purpose is to improve reliability by eliminating false alarms.

[0006]

According to a first aspect of the present invention, there is provided a flow rate measuring means for generating a signal in accordance with an amount of gas passing through a gas meter provided in a gas supply line. A calculation unit for calculating a calorific value per unit time of the gas meter passing gas amount based on a signal from the flow rate measuring means, a category for determining which of the gas calorific value categories the calorific value is divided into a plurality in advance and obtained A determination unit, an initial continuous use allowable time setting unit that sets an allowable time that can be continuously used in advance in accordance with the classification determined by the classification determination unit, and a gas having a calorific value calculated by the calculation unit after the gas starts flowing. The continuous use time is compared with the continuous use allowable time, a continuous use time determination unit that outputs a cutoff signal when the former exceeds the latter, a timer that counts a predetermined period, and the timer is started. Motion signal applying means, a use state storage unit that stores a maximum value of each continuous use time of each heat generation amount section during the timer operation, and an allowable time in the continuous use time determination unit according to information in the use state storage unit. An area determining unit that determines in which area of the section determined by the section determining unit the calorific value calculated by the calculating unit; and the calorific value by the area determining unit. A control section comprising an adjacent section continuous use permissible time changing section for changing the continuous use permissible time of a section adjacent to the section determined by the section determination section when is present in the predetermined area; and a shutoff signal from the control section. In order to shut off the gas passage.

A second means of the present invention is such that the adjacent section continuous use allowable time changing section changes the continuous use allowable time of the adjacent section in proportion to the ratio of the gas passing gas amount to the heat generation section. It was made.

[0008]

According to the first means, the gas shut-off device of the present invention changes the continuous use allowable time of the adjacent section according to the amount of gas passing through the meter that has appeared in the predetermined area.
In response to the transition of the calorific value category due to the change of the season, it is possible to prevent erroneous shutoff and erroneous alarm.

According to the second means, the gas shut-off device of the present invention changes the allowable use time of the adjacent section in proportion to the ratio of the amount of gas passing through the meter to the calorific value section. , The erroneous cutoff and erroneous alarm can be prevented.

[0010]

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

FIG. 1 shows a gas shut-off device according to a first embodiment.
It will be described based on. In FIG. 1, components having the same numbers as those in FIG. 5 are components having the same names and the same functions.

A control unit 10 receives a flow rate signal from a flow rate measuring means 3 and calculates a calorific value per unit time as in the prior art. A category determining unit 7a for determining which of the heat generation categories belongs to, and an initial continual use allowable time setting unit 8 for setting an allowable time that can be continuously used in advance in accordance with the category determined by the category determining unit 7a And a continuous use time after the gas of the calorific value calculated by the calculation unit 6 starts flowing and a continuous use allowable time, and when the former exceeds the latter, a continuous use time determination unit 9a that outputs a cutoff signal. A timer 11 for counting a predetermined time; a start signal applying means 12 for sending a start signal for starting counting to the timer;
A use state storage unit 13 that stores the maximum value of each continuous use time of each heat generation amount division according to a signal of the division determination unit 7a when the timer starts operating, and a use state storage unit 13
The allowable use time change unit 14 for changing the allowable time in the continuous use time determination unit 9a according to the information of the heat generation amount calculated by the calculation unit 6 and the classification of the classification determined by the classification determination unit 7a. An area determining unit for determining whether or not the area is present in an area, and an adjacent section continuous use permission for changing the continuous use allowable time of a section adjacent to the section determined by the section determining unit according to information of the area determining unit Time change unit 16
It is composed of The adjacent section continuous use allowable time changing unit 16 changes the continuous use allowable time of the upper and lower sections in proportion to the position obtained by the area determination unit 15.
The above-described control unit can be easily realized by using an operation or a judgment function by a program operation of a microcomputer or the like.

In the above configuration, the area determining section 15 determines which position of the section determined by the section determining section 7a the gas calorific value calculated by the calculating section 6 is. When the position is within a predetermined value from the upper limit of the section, the continuous use allowable time of the section is reflected on the continuous use allowable time of the section above it. When the position is within a predetermined value from the lower limit of the section, the continuous use allowable time of the section is reflected on the continuous use allowable time of the section below it. As a reflection method, the continuous use permissible time of the appearing section may be directly reflected, or may be reflected by multiplying by a predetermined coefficient. Further, the continuous use allowable time may be changed according to the number of times the predetermined range is reached within the predetermined time.

Referring to the program flow of FIG. 2, when the program starts, the initial allowable time is set in A, the calorific value is calculated from the flow rate pulse in B, and the result is calculated in C. Based on the E, the area determination of the calorific value division is performed. If the number of appearances in the predetermined area is determined in E, the number of appearances in the predetermined area is counted. I do. Subsequently, in F, the category is registered in the corresponding calorific value and the usage time is measured. Then, it is determined whether or not the timer for a predetermined time is counting in G, and when the timer is counting, the gas use state is stored in H, that is, which heating value category is continuously used for how long, and stored. Update the maximum value.

Thereafter, the continuous use allowable time set in I is compared with the signal from the classification determination section 7a. As a result of this comparison, if the result is abnormal, that is, if the allowable time has been exceeded, the process branches at J and jumps to the K cutoff signal output. If not abnormal, look at L to see if the change means has been activated,
When the operation has been completed, the process returns to h1, that is, the calculation of the calorific value of B. When the timer count has not been completed, M is used to determine whether or not the timer count has ended. At the end, the use state is compared with the initial setting condition using N, a predetermined value is selected, and the allowable time is reset using O. .

Thereafter, in I, the reset value is treated as the continuous use allowable time and compared with the detected value. If the timer count is not completed in M, the process branches to P to determine whether or not the count is currently being performed. When counting is in progress, counting is continued with Q, and when counting is not performed, the presence or absence of a start signal is determined with R. When the start signal is input, the timer count is started in S. If there is no signal yet, the process returns to B again.

Hereinafter, a description will be given with reference to a program flow in which the method of resetting the adjacent continuous use allowable time shown in FIG. 3 is different. The resetting method performs the position determination of the flow rate in the section where the gas passing through the meter appears in D, At E, the continuous use allowable time of the adjacent section is reset by multiplying the continuous use allowable time by a coefficient according to the position ratio in the appearance section. Other operations are the same as those shown in FIG.

[0018]

As described above, according to the gas shut-off device of the present invention, the following effects can be obtained.

According to the first aspect, it is possible to prevent erroneous cutoff and erroneous alarm due to transition of the heat generation amount category due to change of season of a proportionally controlled water heater or the like.

According to the second aspect, since the continuous use allowable time is changed in proportion to the appearance position of the gas passing through the meter, the allowable time can be set more in accordance with the actual use condition, and the safety and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gas cutoff device with an adjacent section learning function according to a first embodiment of the present invention.

FIG. 2 is a program flowchart of the apparatus.

FIG. 3 is a program flowchart of a gas cutoff device with an adjacent section learning function according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional gas shut-off device.

FIG. 5 is a block diagram of a control unit of the apparatus.

[Explanation of symbols]

 Reference Signs List 2 Gas meter 3 Flow rate measuring means 4 Shutoff means 6 Arithmetic unit 7 Classification judgment unit 8 Initial continuous use allowable time change unit 9 Continuous use time judgment unit 11 Timer 12 Start signal application unit 13 Use state storage unit 14 Continuous use allowable time change unit 15 Area judgment section 16 Adjacent section continuous use allowable time change section

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/24 101

Claims (2)

(57) [Claims] 1. A flow rate measuring means for generating a signal in accordance with an amount of gas passing through a gas meter provided in a gas supply line, and a calorific value per unit time of the amount of gas passing through the gas meter based on a signal from the flow rate measuring means. An operation unit for calculating
A division determination unit that determines which of the gas calorific value categories the heat value belongs to in advance obtained by dividing the heat value into a plurality of pieces, and an allowable time that can be continuously used in advance corresponding to the category determined by the category determination unit. Initial continuous use allowable time setting unit to be set, compares the continuous use time after the gas of the calorific value calculated by the calculation unit starts flowing with the continuous allowable use time, and outputs a cutoff signal when the former exceeds the latter. A continuous use time determining unit, a timer that counts a predetermined period, a start signal applying unit that starts the timer, a use state storage unit that stores a maximum value of each continuous use time of each heat generation amount section during the operation of the timer, A continuous use allowable time change unit that changes an allowable time in the continuous use time determination unit according to information in a use state storage unit, and a section in which the calorific value calculated by the calculation unit is determined by the classification determination unit. A region determining unit that determines which region the heat generation amount is in, and when the heat generation amount is within a predetermined region, continuously uses a heat generation amount segment adjacent to the heat generation amount determined by the region determination unit. A gas shutoff device with an adjacent zone learning function, comprising: a control unit including an adjacent section continuous use allowable time changing unit that changes an allowable time; and a shutoff unit that shuts off a gas passage according to a shutoff signal from the control unit. 2. A configuration in which an adjoining section continuous use allowable time changing section changes a continuous use allowable time of a heat generation section adjacent to the heat generation section in proportion to a ratio of a meter passing gas amount to the gas heat generation section. The gas shut-off device with an adjacent section learning function according to claim 1.