JP3451174B2 - Water temperature control method of water tank in vacuum sewer system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a water temperature of a water refill tank in a vacuum type sewer system.
TECHNICAL FIELD The present invention relates to a water temperature control method for a water refill tank designed so as to avoid wasting water necessary for restoring the water temperature of the water refill tank to a normal temperature or lower by performing appropriate water supply and drainage. 2. Description of the Related Art In a vacuum type sewer system, as shown in FIGS. 2 and 3, sewage generated in a private house 1 or the like is caused to flow naturally to a sewage mass 3 by a natural downflow pipe 2, and the sewage mass 3
When the water level rises to a predetermined level, the water level is detected, and the vacuum valve 4 installed on the sewage cell 3 is opened,
A vacuum drain pipe 7 connecting the vacuum valve 4 and the water collecting tank 6 installed in the vacuum pumping station 5 is connected to the water collecting tank 6 through the water collecting tank 6.
The vacuum pressure of the operating vacuum pump 8A in the two vacuum pumps 8A and 8B is applied, and the sewage collected in the sewage mass 3 is sucked into the vacuum sewage pipe 7 by the vacuum pressure, and the water collection tank 6
And the water level in the water collection tank 6 is changed to the start start water level HWL.
If the water level HWL rises, the water level
And outputs the start signal to the sewage pump 10A of the two sewage pumps 10A and 10B based on the input water level detection signal to start it. The waste water in the water collecting tank 6 is discharged. In FIG. 2, reference numeral 12 denotes a drain pit, and reference numeral 13 denotes a vacuum pump drain pipe. When the water level in the water collecting tank 6 is lowered to the operation stop water level LWL by the operation of the sewage pump 10A, the water level LWL is detected by the water level detecting means 9 and inputted to the control means 11, and is inputted to the control means 11. Outputs an operation stop signal to the sewage pump 10A based on the input water level detection signal to stop the operation of the sewage pump 10A,
In this state, if the water level rises to the start start water level HWL, a start signal is output to the sewage pump 10B to start the sewage pump 10B, and the sewage in the water collecting tank 6 is discharged. In other words, the two sewage pumps 10A and 10B are alternately operated based on the order in which the water level in the water collection tank 6 rises to the starting water level HWL to discharge the sewage in the water collection tank 6. Have been. On the other hand, a water tank 14 is installed in the vacuum pump station 5. A water supply pipe 16 provided with a water supply valve 15 and a drainage pipe 18 provided with a drainage valve 17 are connected to the water supply tank 14, and a water level detecting means 19 for detecting a water level in the tank and a water temperature in the tank are detected. A water temperature detecting means 20 for detecting is provided.
Further, a circulating system 21 for circulating water from the water refilling tank 14 to the water sealing portions of the vacuum pumps 8A and 8B is provided. The circulation system 21 includes a water / water separation tank 21A and a circulation pump 21B. The inlet of the water refilling tank 14 and the sealing section of the vacuum pumps 8A and 8B is connected by a water sealing pipe 21C.
The outlets of A and 8B and the inlet of the steam separator 21A are connected by a steam drain pipe 21D.
The water separated from the air in A is configured to be returned to the rehydration tank 14 through the return pipe 21E by the operation of the circulation pump 21B. In the figure, 21V indicates a water sealing valve, and 22 indicates a water supply source. [0005] In the vacuum type sewer system configured as described above, a conventional method of controlling the water temperature of the water tank will be described. The water level in the water tank 14 is detected by the water level detection means 19 and input to the control means 11, and the control means 11 outputs a control signal based on the input water level detection signal. That is, when the water level in the water refill tank 14 decreases to the water supply start water level LWL1,
Water level detecting means 19 which has detected the water supply start water level LWL1
And outputs a valve open signal to the water supply valve 15 based on the water level detection signal from the water supply valve 15 to open the water supply valve 15 and start water supply to the water refill tank 14. When the water level rises to the water supply stop water level HWL1 due to the water supply to the water refill tank 14, the water supply stop water level HWL1
Is output to the water supply valve 15 based on the water level detection signal from the water level detection means 19 detecting the water level, the water supply valve 15 is closed, and the water supply to the water refill tank 14 is stopped. [0006] The water in the water refill tank 14 is circulated by the circulating system 21 through the water sealing section of the vacuum pump 8A or the vacuum pump 8B, so that the water temperature rises. When the water temperature is higher than the upper limit temperature, the water sealing performance is reduced. For this reason, the water temperature of the water refill tank 14 becomes higher than the upper limit temperature and is detected by the water temperature detecting means 20 and the control means 1
When input to 1, the control means 11 outputs a valve open signal to the drain valve 17 based on the input water temperature detection signal equal to or higher than the set upper limit temperature to open the valve, and drains hot water. As a result, when the water level in the refill tank 14 drops to the water supply start water level LWL1, the control means 11 sends a valve open signal to the water supply valve 15 based on the water level detection signal from the water level detection means 19 which has detected the water supply start water level LWL1. The water is supplied and the water supply valve 15 is opened to supply cold water (for example, tap water) from the water supply source 22 to the water supplement tank 14. When water is supplied to the water refill tank 14 and the water temperature falls below the normal temperature and is detected by the water temperature detecting means 20 and is input to the control means 11, the control means 11 outputs a water temperature detection signal lower than the input normal temperature. Is controlled to output a valve close signal to the drain valve 17 on the basis of to close the valve and stop draining,
Due to the stoppage of drainage, the water level in the water refill tank 14 becomes the water stop water level HW
When it rises to L1, based on the water level detection signal from the water level detection means 19 which has detected the water supply stop water level HWL1,
The control means 11 is controlled to output a valve closing signal to the water supply valve 15 to close the water supply valve 15 and stop water supply. However, due to the influence of the ambient temperature around the water refill tank 14 and the responsiveness of the water temperature detecting means 20, the actual water temperature in the water refill tank 14 and the water temperature detected by the water temperature detecting means 20 are controlled by the control means 1.
The detected temperature input to 1 deviates, and the water temperature in the water refilling tank 14 has exceeded the normal temperature from the water level detecting means 19 to the control means 11 even though the water temperature has already fallen below the normal temperature. A water temperature detection signal is input. For this reason, it takes time until the water level detecting means 19 inputs a water temperature detection signal lower than the normal temperature to the control means 11 after the actual water temperature in the water refilling tank 14 falls to the normal temperature or less, and accordingly the drain valve 17 Delay valve closing timing. In addition, since the drainage by opening the drain valve 17 and the water supply by opening the water supply valve 15 simultaneously proceed to prevent a rise in the water level, the amount of drainage increases and the water temperature of the water refill tank 14 is restored to a normal temperature or lower. A relatively large amount of water will be wasted. In the conventional water temperature control method of the water refill tank in the vacuum type sewer system, the ambient temperature around the water refill tank and the responsiveness of the water temperature detecting means are affected.
After a difference occurs between the actual water temperature in the water tank and the temperature detected by the water temperature detection means and input to the control means, and the actual water temperature in the water tank falls to or below the normal temperature, the water level detection means is controlled by the control means. It takes time to input a water temperature detection signal that is lower than the normal temperature to the valve.This delays the valve closing timing of the drain valve and the simultaneous progress of drainage by opening the drain valve and water supply by opening the water supply valve. There is a disadvantage in that a relatively large amount of water is wasted in restoring the water temperature of the water refilling tank to a temperature lower than the normal temperature due to an increase in the amount of drainage due to, for example, preventing a rise in the water level. Therefore, an object of the present invention is to provide a water temperature control method for a water refill tank in a vacuum sewer system that can eliminate waste of water necessary for restoring the water temperature of the water refill tank to a normal temperature or lower. is there. [0010] In order to achieve the above object, the present invention is to dispose sewage generated in a private house or the like to a sewage mass by a natural downflow pipe and installed in the sewage mass. Open the vacuum valve, load the vacuum pressure of the vacuum pump installed in the vacuum pump station to the vacuum sewer pipe connected to the vacuum valve via the water collection tank, to the water collection tank It is configured to collect water, start the sewage pump when the water level in the water collection tank rises to a predetermined water level, and discharge the sewage in the water collection tank, and interpose a water supply valve. A water supply pipe and a water refill tank to which a drain pipe provided with a drain valve is connected are installed, and a circulating system for circulating water from the water refill tank to a sealing part such as the vacuum pump and the sewage pump is provided, and Water level detection for detecting the water level in the water tank In a vacuum type sewer system in which a sensing means and a water temperature detecting means for detecting a water temperature of the water tank are installed, the water temperature of the water tank becomes equal to or higher than a set upper limit temperature and is detected by the water temperature detecting means and input to the control means. Then, the control means outputs a valve open signal to the drain valve based on the input water temperature detection signal equal to or higher than the set upper limit temperature to open the drain valve and output a valve close signal to the water supply valve. Then, the water supply valve is closed, and a timer is started.When the set time has elapsed, a valve close signal is output to the drain valve to close the water drain valve and close the water supply valve. When the output of the valve closing signal of the valve is released and the water level of the water refill tank is equal to or lower than the water supply start water level, the water supply valve is opened to supply water, and the water level of the water refill tank becomes the water supply stop water level by the water supply. And detected by the water level detection means When input to the control means, the control means outputs a valve closing signal to the water supply valve based on the input water supply stop water level detection signal to close the water supply valve, and at the same time, sets a delay timer. The timer is started, and the water temperature at the time when the delay time set by the delay timer has elapsed is detected by the water temperature detection means and input to the control means, and the water temperature detection signal value input to the control means is equal to the set upper limit. If the value is equal to or lower than the normal temperature that is lower than the temperature, the control for restoring the water temperature of the water refill tank to the normal temperature or less ends, and if the water temperature detection signal value input to the control unit is a value that exceeds the normal temperature, The present invention is characterized in that control for restoring the water temperature of the water refill tank to the normal temperature or lower is restarted. According to the present invention, the water supply valve is always closed when the drain valve is opened, so that simultaneous drainage by opening the drain valve and water supply by opening the water supply valve can be avoided. Also, the water temperature after the time corresponding to the delay time of the delay timer is detected by the water temperature detecting means and input to the control means, and control is terminated or restarted based on the input water temperature detection signal value. Can be. An embodiment of the present invention will be described below with reference to the drawings. The overall configuration of the vacuum sewer system is the same as that of the conventional example shown in FIG. In FIG. 1, the water level of the water refill tank 14 is, for example, at a water supply stop water level HWL1, and this water level HWL
1 is detected by the water level detection means 19 and input to the control means 11, which outputs a valve closing signal to the water supply valve 15 based on the input water level detection signal to close the water supply valve 15. In the state: The water in the water refilling tank 14 is circulated through the water sealing section of the vacuum pump 8A or the vacuum pump 8B by the circulation system 21, so that the water temperature rises. When the water temperature of the water refill tank 14 becomes equal to or higher than the set upper limit temperature, the water temperature is detected by the water temperature detecting means 20 and input to the control means 11. The control means 11 controls the drain valve 17 based on the input water temperature detection signal equal to or higher than the set upper limit temperature.
, And the drain valve 17 is opened. On the other hand, the valve opening time of the drain valve 17 is set and inputted in advance to a timer 23 incorporated in the control means 11 as a time measurement time. [0015] As described above, when the water temperature of the water refill tank 14 becomes equal to or higher than the set upper limit temperature, the drain valve 17 is opened by the output of the valve opening signal from the control means 11, and the valve closing signal is output to the water supply valve 15 to output the valve closing signal. The water supply valve 15 is closed, and at the same time, the timer 23 starts counting time. [0016] When the set time has elapsed, the timer 23 outputs a time-up signal (valve close signal) to the drain valve 17 to close the drain valve 17, and
A valve opening signal is output to the water supply valve 15, the water supply valve 15 is opened, and water is supplied to the water refill tank 14. [0017] When the water level in the refill tank 14 rises to the water supply stop water level HWL1 due to the water supply, the water level HWL
1 is detected by the water level detection means 19 and a water supply stop water level detection signal is input to the control means 11. The control means 11 outputs a valve closing signal to the water supply valve 15 based on the input water supply stop water level detection signal, closes the water supply valve 15 and stops water supply, and at the same time, is incorporated in the control means 11. The timer 24 starts counting time. [0018] The water temperature at the time when the delay time (for example, 2 minutes to 3 minutes) set by the delay timer 24 has elapsed is detected by the water temperature detection means 20, and the water temperature detection signal is input to the control means 11. If the input water temperature detection signal value becomes equal to or lower than the normal temperature lower than the set upper limit temperature and the water temperature of the water refill tank 14 has recovered to the normal temperature or lower, the control is terminated here. [0019] If the water temperature detection signal value input to the control means 11 is a value exceeding the normal temperature and the water temperature of the water refill tank 14 exceeds the normal temperature, the control of the above-mentioned, that is, the water temperature of the water refill tank 14 is reduced. The control for recovering the temperature to the normal temperature or lower is restarted, and the control is terminated when the input water temperature detection signal value becomes equal to or lower than the normal temperature lower than the set upper limit temperature and the water temperature of the water refill tank 14 recovers to the normal temperature or lower. I do. As described above, the water supply valve 15 is always closed when the drain valve 17 is opened, so that simultaneous drainage by opening the drain valve 17 and water supply by opening the water supply valve 15 can be avoided. As in the prior art, the drainage by opening the drain valve 17 and the water supply by opening the water supply valve 15 simultaneously proceed to prevent a rise in the water level. As a result, the amount of drainage increases, and the temperature of the water in the water refilling tank 14 is kept constant. The disadvantage that a relatively large amount of water is wasted in recovering the temperature below the temperature can be eliminated. Further, the water temperature after the time corresponding to the delay time of the delay timer 24 has been obtained is detected by the water temperature detecting means 20 and input to the control means 11, and the control is performed based on the input water temperature detection signal value. Is terminated or restarted, the influence of the ambient temperature around the water refilling tank 14 and the responsiveness of the water temperature detecting means 20 can be avoided by increasing the time, so that the difference between the actual water temperature and the detected temperature is eliminated, and extra Drainage and water supply can be avoided. In the above embodiment, the time during which the drain valve 17 is opened is set in the timer 23 incorporated in the control means 11 as a time-measurement time, and when the set time elapses, the water is drained from the timer 23. A time-up signal is output to the valve 17 to close the drain valve 17, and the control means 11 outputs a valve open signal to the water supply valve 15 to open the water supply valve 15 and supply water to the refill tank 14. However, the time required for the water level to decrease from the water supply stop water level HWL1 to the water supply start water level LWL1 may be set as the time measured in the timer 23 incorporated in the control means 11. When the time set by the timer 23 is set in this way,
When the water level in the water tank 14 drops to the water supply stop water level HWL1, the timer 23 outputs a time-up signal to the drain valve 17 to close the drain valve 17 and controls the water supply valve 15 based on the time-up signal. The valve is opened by the valve opening signal output from the means 11 and the valve opening signal output from the control means 11 based on the water level detection signal from the water level detection means 19 which has detected the water supply start water level LWL1, Water can be supplied to the rehydration tank 14. A timer 23 and a delay timer 24
However, if the time set in the timer 23 and the delay time of the delay timer 24 are the same, one of the timer 23 and the delay timer 24 may be omitted. The timer time set in the timer 23 and the delay time of the delay timer 24 are not limited to the above-described range of 2 to 3 minutes. What is necessary is just to change it suitably according to conditions, such as the atmospheric temperature around the water refill tank 14 which changes with a diameter or a season. Further, in the above embodiment, the water refill tank 14
Is circulated only to the sealed portion of the vacuum pump 8A or the vacuum pump 8B by the circulation system 21, but the water is also circulated to the shaft sealed portions of the sewage pumps 10A and 10B by the circulation system 21. The present invention is also applicable to the rehydration tank 14. As described above, according to the present invention,
When the drain valve is opened, the water supply valve is always closed, so that simultaneous drainage by opening the drain valve and water supply by opening the water supply valve can be avoided. As a result, the disadvantage that the amount of drainage increases and a relatively large amount of water is wasted in restoring the water temperature of the water refill tank to the normal temperature or lower is eliminated. Further, since the water temperature after the time corresponding to the delay time of the delay timer is detected by the water temperature detection means and input to the control means, and the control is terminated or restarted based on the input water temperature detection signal value. The influence of the ambient temperature around the water tank and the responsiveness of the water temperature detection means is avoided by the time gain, eliminating the difference between the actual water temperature and the detected temperature, and avoiding excessive drainage and water supply. Can be.

[Brief description of the drawings] FIG. 1 is an explanatory diagram showing an embodiment of the present invention. FIG. 2 is a configuration diagram of a vacuum type sewer system. FIG. 3 is an explanatory diagram showing a conventional control method. [Explanation of symbols] 1 private house 2 Natural downflow pipe 3 sewage trout 4 Vacuum valve 5 vacuum pump station 6 Water collection tank 7 Vacuum sewer line 8A vacuum pump 8B vacuum pump 10A Sewage pump 10B Sewage pump 11 control means 14 Water tank 15 Water supply valve 16 Water pipe 17 drain valve 18 drainage pipe 19 Water level detection means 20 Water temperature detection means 21 Circulatory system 23 Timer 24 Delay timer HWL1 Water supply stop water level of rehydration tank LWL1 Water supply start water level of rehydration tank

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E03F 7/00

Claims (1)

(57) [Claims] [Claim 1] Sewage generated in a private house or the like is allowed to flow naturally to a sewage mass by a natural downflow pipe, and a vacuum valve installed in the sewage mass is opened to open a vacuum pump. The vacuum pressure of a vacuum pump installed at the site is loaded on a vacuum drain pipe connected to the vacuum valve via a water collecting tank to collect water in the water collecting tank. When the water level rises to a predetermined water level, the sewage pump is started to discharge the sewage in the water collecting tank, and a water supply pipe provided with a water supply valve and a drain valve are provided. A water refill tank to which a drain pipe is connected is provided, and a circulating system for circulating water from the water refill tank to a sealing portion such as the vacuum pump and the sewage pump is provided, and a water level detection for detecting a water level of the water refill tank. Means, and a water temperature for detecting a water temperature of the water tank. In the vacuum sewer system in which the detecting means is installed, when the water temperature of the water tank is equal to or higher than the set upper limit temperature and is detected by the water temperature detecting means and input to the control means, the control means sets the input set upper limit. A valve open signal is output to the drain valve based on the water temperature detection signal equal to or higher than the temperature to open the drain valve, and a valve close signal is output to the water supply valve to close the water supply valve. Start timing, and when the set time has elapsed, output a valve closing signal to the drain valve to close the drain valve and release the output of the valve closing signal of the water supply valve to release the valve. If the water level in the water refill tank is equal to or lower than the water supply start water level, the water supply valve is opened to supply water. When input to the means, Means closed valve the water supply valve and outputs the No. valve closing signal to the water supply valve based on the input water supply stop water level detection signal,
At the same time, the timer of the delay timer is started, and the water temperature at the time when the delay time set by the delay timer has elapsed is detected by the water temperature detection means and input to the control means, and the water temperature detection input to the control means is detected. If the signal value is equal to or lower than the normal temperature lower than the set upper limit temperature, the control for restoring the water temperature of the water refill tank to the normal temperature or lower is finished, and the water temperature detection signal value input to the control unit is the normal temperature. A control method for restoring the water temperature of the water refill tank to the normal temperature or lower if the value exceeds the normal temperature.