JP2002250527A - Device for detecting pressure abnormality of warm water system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely detect pressure abnormality regardless of the flow rate of warm water, concerning a pressure abnormality detector which detects the abnormality of the circulating circuit of a warm water system such as a warm water heating system, a warm water thawing system, etc. SOLUTION: This is a pressure abnormality detector which detects the pressure abnormality within the circulating circuit 9 of the warm water system, and this pressure abnormality detector is equipped with a pressure sensor 13 which detects the pressure level within the circulating circuit 9, a flow rate sensor 14 which detects the flow rate of warm water within the circulating circuit 9, an abnormal pressure level setting means 15 which sets the upper limit pressure level (lower limit pressure level) geared to the flow rate of warm water detected by the flow rate sensor 14, and a pressure abnormality judging means 16 which judges the existence of pressure abnormality by comparing the pressure level detected by the pressure sensor 13 with the upper limit pressure level (lower limit pressure level) set by the abnormal pressure level setting means 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting abnormal pressure in a hot water system such as a hot water heating system used for floor heating or hot water type hot air heating, or a hot water snow melting system used for roof snow melting or road heating.

[0002]

2. Description of the Related Art Conventionally, in this type of hot water system, as disclosed in Japanese Patent Publication No. 55-5612, a heater for heating hot water and a heat for heating hot water are provided in a circulation circuit for circulating hot water. In order to detect an abnormality in a circulation circuit of a hot water system including a radiator that dissipates heat, a circulation pump that circulates hot water, and an expansion tank that absorbs expansion of the hot water, an operation is performed when the expansion tank expands to a certain degree or more. A switch for detecting pressure and a switch for detecting water leakage which is activated when the switch is contracted to a certain degree or more to detect an abnormal rise in pressure level in the circulation circuit or an abnormality in the circulation circuit such as water leakage, As disclosed in Japanese Patent Application Laid-Open No. 10-185218, a pressure sensor is provided in a circulation circuit instead of the switch, and an abnormality is detected when a detected pressure level falls below a predetermined level stored in advance. There was to be known.

[0003]

However, the pressure level of the hot water (circulating fluid or antifreeze) flowing in the circulation circuit changes according to the flow rate even when there is no abnormality. For both the overpressure detection switch and the water leakage detection switch, the operating points of the switches are determined mechanically at fixed points, and the latter also has a constant pressure level to detect abnormal pressures. However, if the standard for leak detection is set when the flow rate of hot water is large, the flow rate will decrease, and the pressure level in the circulation circuit will increase. If the standard is set, the flow rate will increase, and if the pressure level in the circulation circuit decreases, there will be problems such as overpressure detection becoming dull. There is a problem that kick.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heater for heating hot water and a radiator for radiating heat of the hot water in a circulation circuit for circulating hot water. And a pressure abnormality detecting device for detecting a pressure abnormality in a circulation circuit of a hot water system comprising a circulation pump for circulating hot water, wherein the pressure abnormality detection device detects a pressure level in the circulation circuit. A sensor, a flow rate sensor for detecting a flow rate of hot water in the circulation circuit, an abnormal pressure level setting means for setting an upper limit pressure level according to the flow rate of hot water detected by the flow rate sensor, and a pressure level detected by the pressure sensor. A pressure abnormality judging means for judging the presence / absence of pressure abnormality by comparing the pressure with an upper limit pressure level set by the abnormal pressure level setting means is provided.

Thus, the abnormal pressure level setting means sets the upper limit pressure level in consideration of an appropriate pressure change according to the flow rate of the hot water, and the pressure level in the circulation circuit is set to the upper limit pressure corresponding to the current flow rate of the hot water. When the pressure becomes equal to or higher than the level, the pressure abnormality determination means determines that the pressure abnormality has occurred, so that the pressure abnormality can be detected quickly and accurately regardless of the flow rate of the hot water.

According to a second aspect of the present invention, a circulation system for circulating hot water includes a heater for heating the hot water, a radiator for radiating heat of the hot water, and a circulation pump for circulating the hot water. A pressure abnormality detection device that detects a pressure abnormality in a circuit, the pressure abnormality detection device includes a pressure sensor that detects a pressure level in the circulation circuit, and a flow sensor that detects a flow rate of hot water in the circulation circuit. Abnormal pressure level setting means for setting a lower limit pressure level corresponding to the flow rate of hot water detected by the temperature sensor, and comparing a pressure level detected by the pressure sensor with a lower limit pressure level set by the abnormal pressure level setting means. Pressure abnormality judging means for judging the presence or absence of pressure abnormality.

[0007] Thus, the abnormal pressure level setting means sets the lower limit pressure level in consideration of an appropriate pressure change according to the flow rate of the hot water, and the pressure level in the circulation circuit is set to the lower limit pressure corresponding to the flow rate of the hot water at each time. When the pressure exceeds the level, the pressure abnormality determination means determines that the pressure abnormality has occurred, so that the pressure abnormality can be detected quickly and accurately regardless of the flow rate of the hot water.

Here, the abnormal pressure level setting means includes:
One or both of the upper limit pressure level and the lower limit pressure level are set, and the abnormal pressure level setting means of claim 1 only has to set at least the upper limit pressure level, and the abnormal pressure level setting means of claim 2 has at least the lower limit pressure level. It is sufficient that the pressure level can be set, and it is not always necessary to set both the upper limit pressure level and the lower limit pressure level simultaneously.

According to a third aspect of the present invention, the pressure abnormality detecting device includes a notifying means for notifying that a pressure abnormality has occurred when the pressure abnormality determining means determines that there is a pressure abnormality.

Accordingly, when the pressure level in the circulation circuit becomes equal to or higher than the upper limit pressure level or equal to or lower than the lower limit pressure level and the pressure abnormality determining means determines that the pressure is abnormal, the occurrence of the pressure abnormality is reported by the notification means. Therefore, it can be notified that a pressure abnormality has occurred in the hot water system, and the administrator of the hot water system can take appropriate measures.

The notification mode of the notification means is as follows.
Some alarms emit a warning sound, and a display indicates that an abnormal pressure has occurred.

According to a fourth aspect of the present invention, the pressure abnormality detection device stops the operation of the hot water system when the pressure abnormality is continuously detected for a predetermined time or more.

Thus, it is possible to prevent the hot water system from continuing to be operated in a dangerous state while the abnormal pressure occurrence state continues, and to ensure the safety of the hot water system.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the pressure abnormality detecting device of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a heater for heating hot water (a circulating liquid or an antifreeze liquid). In this embodiment, the hot water in the can body 3 is heated by a burner 2. The heater 1 is not limited to this configuration, and may be, for example, a heater using an electric heater or an indirect heat exchange heater that exchanges heat with hot water heated by another heat source.

Reference numeral 4 denotes a radiator for radiating heat of the hot water. In this case, a copper hot water pipe 5 is meanderingly piped below the floor to heat the floor. The radiator 4 is not limited to this configuration. For example, the radiator 4 may be a hot-water type hot-air heater that performs hot air heating by blowing a fan through a hot water pipe made of resin, or a heat radiator for heating such as an iron radiator panel. It may be a vessel or a radiator for snow melting used for roof snow melting or road heating.

Reference numerals 6 and 7 denote a forward pipe and a return pipe which connect the heater 1 and the radiator 4 so that hot water can circulate.

Reference numeral 8 denotes a circulating pump provided in the forward pipe 6. When the circulating pump 8 is driven, hot water circulates between the heater 1 and the radiator 4 to generate heat for heating or melting snow. The heater 1, the radiator 4, the forward pipe 6, the return pipe 7, and the circulation pump 8 constitute a circulation circuit 9 through which hot water can be circulated.

Reference numeral 10 denotes a steam-water separator provided in the forward pipe 6, and reference numeral 11 denotes an overpressure relief valve. The overpressure relief valve 11
When the pressure level in the circulation circuit 9 exceeds a preset overpressure level, the valve is opened to release the overpressure.

Reference numeral 12 denotes an expansion tank provided in the return pipe 7, which absorbs volume expansion caused by heating the hot water in the closed circulation circuit 9 by the heater 1. In addition,
In this embodiment, the closed hot water system is used, but the present invention is not limited to this, and a semi-closed hot water system may be used.

A pressure sensor 13 is provided between the radiator 4 of the return pipe 7 and the expansion tank 12, and detects a pressure level in the circulation circuit 9. The mounting position of the pressure sensor 13 is not limited to the position of the embodiment shown in FIG. 1, but may be, for example, the downstream side of the expansion tank 12 which is hardly affected by the volume expansion of the circulating fluid, or the circulating pump. It may be mounted near the suction side of the circulating pump 8 which is hardly affected by the drive of the circulating pump 8.

Numeral 14 denotes a flow rate sensor provided in the middle of the circulation circuit 9 and is a volume flow rate (L) of hot water flowing in the circulation circuit 9.
/ Min). The mounting position of the flow sensor 14 is not limited to the position of the embodiment shown in the drawings.
May be mounted in the circulation circuit 9 in the vicinity of.

Reference numeral 15 denotes an abnormal pressure level setting means for setting an abnormal pressure level according to the flow rate of the hot water in the circulation circuit 9 detected by the flow rate sensor 14. The abnormal pressure level is an upper limit pressure level or a lower limit level. The upper limit pressure level is set to detect an overpressure condition of the hot water system, and the lower limit pressure level is set to detect leak of the hot water system.

Here, since the pressure level in the circulation circuit 9 of the hot water system changes as shown in FIG. 2 according to the flow rate of the flowing hot water, the abnormal pressure level setting means 15 sets an appropriate pressure for this flow rate. In consideration of the change, an abnormal pressure level (an upper limit pressure level and a lower limit pressure level) which is increased or decreased by a fixed ratio with respect to the appropriate pressure level is set.

Here, the abnormal pressure levels (upper limit pressure level and lower limit pressure level) are stored in advance in the abnormal pressure level setting means 15 as data corresponding to the flow rate of hot water, and are detected by the flow rate sensor 14 at each time. The abnormal pressure level (upper limit pressure level and lower limit pressure level) corresponding to the hot water flow rate is read and set.

It is to be noted that this does not prevent setting only one of the upper limit pressure level and the lower limit pressure level as the abnormal pressure level, and sets only one of the upper limit pressure level and the lower limit pressure level in accordance with the hot water temperature. However, this does not prevent the other from being set at a constant level regardless of the flow rate of the hot water.

Reference numeral 16 denotes a circulating circuit 9 for detecting an abnormal pressure level (upper limit pressure level and lower limit pressure level) set by the abnormal pressure level setting means 15 and the pressure sensor 13.
Pressure abnormality judging means for comparing the pressure level in the
If the pressure level in the circulation circuit 9 detected by the pressure sensor 13 becomes higher than the upper limit pressure level set by the abnormal pressure level setting means 15 or lower than the lower limit pressure level, it is determined that the pressure is abnormal. It should be noted that the content of the pressure abnormality may be distinguished and determined such that when the detected system pressure is equal to or higher than the upper limit pressure level, it is determined that the pressure is excessive, and when the detected system pressure is equal to or lower than the lower limit pressure level, it is determined that the water leaks.

Reference numeral 17 denotes a notifying means for notifying that the pressure abnormality has occurred when the pressure abnormality determining means 16 determines that a pressure abnormality has occurred, and a piezoelectric buzzer (not shown) as a form of notification. May generate a warning sound,
A display (not shown) that displays an error code indicating an abnormal pressure, or a combination of a warning sound and an error code may be used. If the notification means 17 is provided in a remote control device (not shown) of the hot water system, the notification of the pressure abnormality can be easily confirmed.

In the pressure abnormality judging means 16 which distinguishes overpressure and water leakage and transmits the same to the notifying means 17, the contents of the notification by the notifying means 17 are different error codes for overpressure and water leakage, respectively. , Or generate a different warning sound to alert you separately.
Appropriate measures can be taken during maintenance.

The upper limit pressure level set by the abnormal pressure level setting means 15 is set at a pressure level which is increased by a fixed ratio to an appropriate pressure level above an overpressure level at which the overpressure relief valve 11 is opened. If the overpressure relief valve 11 is set at a pressure level higher than the overpressure level by a fixed value regardless of the flow rate of the hot water, an abnormal pressure can be detected immediately when the overpressure relief valve 11 breaks down.

The pressure abnormality judging means 16 has a timekeeping function. When a pressure abnormality occurs continuously for a predetermined time or more, the operation of the heater 1 and the circulating pump 8 is stopped to perform a safe operation. The operation is not continued in a dangerous state, and the circulation circuit 9 is not newly damaged.

The abnormal pressure level setting means 15,
The pressure abnormality determining means 16 functions as one function of a microcomputer (not shown) for controlling the entire hot water system.

Here, the operation of the above-described pressure abnormality detecting apparatus will be described with reference to the flowchart shown in FIG. 3. First, the flow rate of the hot water detected by the flow rate sensor 14 is checked (Step 1, hereinafter abbreviated as S1). The abnormal pressure level setting means 15 sets an abnormal pressure level (one or both of the upper limit pressure level and the lower limit pressure level) based on the detected hot water flow rate (S2).

Next, the pressure level in the circulation circuit 9 detected by the pressure sensor 13 is checked (S3), and the detected pressure level and the abnormal pressure level (one of the upper limit pressure level and the lower limit pressure level) set in S2 are checked. And both) are compared by the pressure abnormality determination means 16, and as a result of the comparison, if the detected pressure level is higher than the upper limit pressure level, or if the detected pressure level is lower than the lower limit pressure level, it is determined that there is a pressure abnormality ( S4) The occurrence of pressure abnormality is reported by the reporting means 17 (S5).

When the abnormal pressure state continues for a predetermined time (S6), the operation of the heater 1 and the circulation pump 8 is stopped to stop the operation of the hot water system (S7).

If it is determined in S4 that there is no pressure abnormality, the steps S1 to S4 are repeated again to constantly check for the presence of a pressure abnormality.

Also, if the pressure abnormality is eliminated before the state of the pressure abnormality in S7 continues for a predetermined time, the steps S1 to S4 are repeated again to constantly check for the presence of the pressure abnormality. I have.

As described above, since the abnormal pressure level is set in accordance with the hot water flow rate, the pressure level in the circulation circuit 9 is the upper limit of the appropriate pressure range even when the hot water flow rate is large. Can be accurately detected, and even when the flow rate of the hot water is small, the pressure level in the circulation circuit 9 becomes equal to or lower than the lower limit pressure level which is the lower limit of the appropriate pressure range, and water leakage occurs. The occurrence can be accurately detected, and the leakage can be detected when a certain amount of leakage occurs regardless of the flow rate of the hot water.

In particular, in a closed type hot water system that often uses the iron radiator 1, water leakage occurs and the circulation circuit 9
If air is mixed in, the radiator 1 made of iron rusts and corrodes, and it is necessary to accurately detect the occurrence of water leakage. Therefore, the abnormal pressure detecting device of the present invention is very useful.

When the function of adjusting the pressure level in the circulation circuit 9 does not work well due to the failure of the expansion tank 12,
Even when the overpressure relief valve 11 fails and the pressure level in the circulation circuit 9 rises abnormally, it is possible to set the upper limit pressure level to a pressure level slightly higher than the overpressure level of the overpressure relief valve 11. Since heavy safety is ensured, the safety of the entire hot water system can be improved, which is very useful.

[0040]

As described above, according to the first aspect of the present invention, the upper limit pressure level is set in consideration of an appropriate pressure change depending on the flow rate of the hot water, and the pressure level in the circulation circuit is set at each time. It is determined that a pressure abnormality has occurred when the pressure becomes equal to or higher than the upper limit pressure level corresponding to the flow rate of the hot water. Therefore, even if the flow rate of the hot water is large or small, the pressure abnormality can be detected quickly and accurately with the same detection accuracy. The reliability of abnormality detection can be improved.

According to the second aspect of the present invention, the lower limit pressure level is set in consideration of an appropriate pressure change depending on the flow rate of the hot water, and the pressure level in the circulation circuit corresponds to the flow rate of the hot water at each time. When the temperature falls below the lower limit pressure level, it is determined that a pressure abnormality has occurred. Therefore, even if the flow rate of hot water is large or small, the pressure abnormality can be detected quickly and accurately with the same detection accuracy, and reliability of pressure abnormality detection Can be improved.

According to the third aspect of the present invention, whether the pressure level in the circulation circuit exceeds the upper limit pressure level,
Or, when the pressure is equal to or lower than the lower limit pressure level, the occurrence of the pressure abnormality is notified, so that the occurrence of the pressure abnormality in the hot water system can be notified, and the administrator of the hot water system can take appropriate measures. .

According to the fourth aspect of the present invention, it is possible to prevent the hot water system from continuing to be operated in a dangerous state while the abnormal pressure state continues, and to ensure the safety of the hot water system. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an upper limit pressure level and a lower limit pressure level of the same embodiment.

FIG. 3 is a flowchart showing the operation of the same embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater 4 Radiator 8 Circulation pump 9 Circulation circuit 13 Pressure sensor 14 Flow rate sensor 15 Abnormal pressure level setting means 16 Pressure abnormality judgment means 17 Notification means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Fumio Watanabe 7-7 Higashi Shinbo, Sanjo City, Niigata Prefecture Corona Co., Ltd. F-term (reference) 3L070 AA01 BC02 BC26 DD01 DD06 DE05 DF11

Claims (4)

[Claims] 1. A pressure abnormality in a circulation circuit of a hot water system including a heater for heating hot water, a radiator for radiating heat of the hot water, and a circulation pump for circulating hot water in a circulation circuit for circulating hot water. A pressure sensor for detecting a pressure level in the circulation circuit, a flow sensor for detecting a flow rate of hot water in the circulation circuit, and a flow sensor. Abnormal pressure level setting means for setting an upper limit pressure level according to the flow rate of hot water to be detected, and comparing the pressure level detected by the pressure sensor with the upper limit pressure level set by the abnormal pressure level setting means to determine whether there is a pressure abnormality. And a pressure abnormality determining means for determining the pressure abnormality. 2. A pressure abnormality in a circulation circuit of a hot water system including a heater for heating hot water, a radiator for radiating heat of the hot water, and a circulation pump for circulating the hot water in a circulation circuit for circulating the hot water. A pressure abnormality detecting device that detects a pressure level in the circulation circuit, a flow sensor that detects a flow rate of hot water in the circulation circuit, and a temperature sensor. Abnormal pressure level setting means for setting a lower limit pressure level corresponding to the flow rate of hot water to be detected, and comparing the pressure level detected by the pressure sensor with the lower pressure level set by the abnormal pressure level setting means to determine whether there is a pressure abnormality And a pressure abnormality determining means for determining the pressure abnormality. 3. The pressure abnormality detection device according to claim 1, wherein the pressure abnormality detection device includes a notification unit that notifies that a pressure abnormality has occurred when the pressure abnormality determination unit determines that there is a pressure abnormality. Pressure abnormality detection device. 4. The pressure abnormality detection for a hot water system according to claim 1, wherein the pressure abnormality detection device stops the operation of the hot water system when the pressure abnormality is continuously detected for a predetermined time or more. apparatus.