JP2002250526A - Device for detecting pressure abnormality of warm water system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely detect pressure abnormality regardless of the kind 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 warm water kind selecting means 14 which selects the kind of warm water to be let flow to 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 kind of warm water selected by the warm water kind selecting means 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 detects an abnormality in a circulation circuit of 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. To a pressure abnormality detection device.

[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 are provided to detect an abnormal increase 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 in place of the switch, and an abnormality is detected when a detected pressure level becomes lower than a predetermined level stored in advance. There was to be known.

[0003]

In this hot water system, hot water (circulating fluid or antifreeze) suitable for the climatic conditions of the area where the hot water system is installed is used. Alternatively, when the volume expansion coefficient differs depending on the concentration, and the temperature is controlled in the same temperature range, the appropriate pressure range also differs because the expansion coefficient is different.

However, in the former case, the operating points of the switches for both the overpressure detection switch and the water leakage detection switch are determined mechanically at fixed points, respectively. Is a constant pressure level, so it is not possible to consider an appropriate pressure range that differs for each type of hot water, and there is no abnormality in the hot water used in one hot water hot water system, but one hot water used in another hot water hot water system. There is a problem that different types of hot water may have abnormal pressure even at the same pressure level, and the accuracy of abnormality detection varies depending on the type of hot water used, resulting in a lack of reliability.

[0005]

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. 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, hot water type selecting means for selecting a type of hot water, abnormal pressure level setting means for setting an upper limit pressure level according to the type of hot water selected by the hot water type selecting means, and a pressure level detected by the pressure sensor. And an abnormal pressure level judging means for judging the presence or absence of an abnormal pressure by comparing the abnormal pressure level with the upper limit pressure level set by the abnormal pressure level setting means.

Accordingly, when the installer selects the type of hot water by the type of hot water selection at the time of installation or the like, the abnormal pressure level setting means sets the upper limit pressure level in consideration of an appropriate pressure change due to the difference in the type of hot water. If the pressure level in the circulation circuit becomes equal to or higher than the upper limit pressure level corresponding to the type of hot water, the pressure abnormality determining means determines that a pressure abnormality has occurred. It is possible to quickly and accurately detect abnormal pressure.

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 detecting device for detecting a pressure abnormality in the circuit, the pressure abnormality detecting device comprising: a pressure sensor for detecting a pressure level in the circulation circuit; a hot water type selecting means for selecting a type of hot water; Abnormal pressure level setting means for setting a lower limit pressure level according to the type of hot water selected by the hot water type selecting means, and comparing a pressure level detected by the pressure sensor with a lower limit pressure level set by the abnormal pressure level setting means. And pressure abnormality determining means for determining the presence or absence of pressure abnormality.

Thus, when the installer selects the type of hot water at the time of installation or the like with the hot water type selecting means, the abnormal pressure level setting means sets the lower limit pressure level in consideration of an appropriate pressure change due to the difference in the type of hot water. When the pressure level in the circulation circuit is equal to or higher than the lower limit pressure level corresponding to the type of hot water, the pressure abnormality determining means determines that a pressure abnormality has occurred. It is possible to quickly and accurately detect a pressure abnormality.

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 determination means determines that the pressure is abnormal, the occurrence of the pressure abnormality is reported by the notification means. 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.

[0014] Thus, it is possible to prevent the hot water system from continuing to be operated in a dangerous state while the pressure abnormal condition continues, and to ensure the safety of the hot water system.

[0015]

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 embodiment, 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, a radiator 4 may be provided with a hot-water type hot-air heater, which is provided with aluminum fins in a copper hot-water pipe and blows air with a fan to perform hot-air heating, or an iron radiator panel. It may be a radiator for heating 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 circulation pump provided in the forward pipe 6. When the circulation 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, in the circulation circuit 9 in the immediate vicinity of the expansion tank 12 which is not easily affected by the volume expansion of the circulating liquid. Alternatively, it may be mounted in the circulation circuit 9 near the suction side of the circulation pump 8 which is hardly affected by the drive of the circulation pump 8.

A hot water type selection means 14 selects and sets the type of hot water (circulating fluid or antifreeze and its concentration) prepared in advance, for example, the state of a DIP switch or a short-circuit terminal (both not shown). Is switched to select the type of hot water.

Here, one of the circulating fluid A, which is a circulating fluid specified by the manufacturer, and a circulating fluid B having a different component from the circulating fluid A, is selected.

Reference numeral 15 denotes an abnormal pressure level setting means for setting an abnormal pressure level according to the type of hot water based on the information of the type of hot water selected by the type of hot water type selecting means 14. This abnormal pressure level is an upper limit pressure level or a lower limit pressure. 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 a leak of the hot water system.

Here, the volume of the hot water flowing through the circulation circuit 9 of the hot water system differs depending on the type thereof, and the appropriate pressure level in the circulation circuit 9 for each hot water also differs as shown in FIG. Therefore, the abnormal pressure level setting means 15 sets an abnormal pressure level (upper limit pressure level and lower limit pressure level) for the type of hot water from the information on the type of hot water from the type selecting hot water 14.

The abnormal pressure levels (upper limit pressure level and lower limit pressure level) are previously stored in the abnormal pressure level setting means 15 as data corresponding to the type of hot water, and are selected by the hot water type selecting means 14. The data of the abnormal pressure level (upper pressure level and lower pressure level) corresponding to the type of hot water is read and set.

The abnormal pressure level corresponding to the type of hot water is, for example, the pressure level indicated by A (1) in FIG. 2 as the upper limit pressure level for the circulating fluid 1 having a large expansion coefficient, and A (2) as the lower limit pressure level. The pressure level indicated by B (1) as the upper limit pressure level and the pressure level indicated by B (2) as the lower limit pressure level is previously stored for the circulating fluid B having a small expansion coefficient. Is what it is.

It should be noted that this does not prevent the setting of only one of the upper limit pressure level and the lower limit pressure level as the abnormal pressure level, and that only one of the upper limit pressure level and the lower limit pressure level is set according to the type of hot water. However, this does not prevent the other from being set at a constant level regardless of the type of hot water. In this embodiment, one of the two types of hot water is selected. However, the present invention is not limited to this. By providing a plurality of DIP switches and the like, the number of hot water type selecting means 14 that can be selected is increased, and It is also possible to select one type from among the types of hot water. In this case, the abnormal pressure level setting means 15 may store the abnormal pressure levels for many types of hot water.

Reference numeral 16 denotes a circulation circuit 9 for detecting an abnormal pressure level (an upper limit pressure level and a 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. If the detected pressure level is equal to or higher than the upper limit pressure level, it is determined that the pressure is excessive,
The content of the pressure abnormality may be determined separately so that the water leakage is determined when the pressure becomes lower than the lower limit pressure level.

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. A piezoelectric buzzer (not shown) is provided 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.

Further, 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 equal to or higher than the overpressure level at which the overpressure relief valve 11 is opened, regardless of the type of hot water. Alternatively, the pressure may be set at a higher pressure level so that an abnormal pressure can be detected immediately when the overpressure relief valve 11 fails.

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 pressure abnormality detecting device described so far will be described with reference to the flowchart shown in FIG. 3. First, an installer or the like operates the hot water type selecting means 14 when the hot water system is installed and constructed. The type of the heated water is selected and set (step 1, hereinafter abbreviated as S1).

Next, the abnormal pressure level setting means 15 checks the hot water type information selected by the hot water type selecting means 14 and determines an abnormal pressure level (one of the upper limit pressure level and the lower limit pressure level or the lower limit pressure level) according to the type of hot water. Are set (S2).

Then, the pressure level in the circulation circuit 9 detected by the pressure sensor 13 is checked (S3), and the detected pressure level is compared with the abnormal pressure level (one of the upper limit pressure level and the lower limit pressure level set in S2). 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 16 (S5).

When the pressure abnormality continues abnormally 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 step S4 that there is no pressure abnormality, the steps S3 to S4 are repeated again to constantly check for pressure abnormality.

Also, if the pressure abnormality is eliminated before the state of the pressure abnormality is continued for a predetermined time in S6, the steps S3 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 according to the type of hot water, the pressure level in the circulation circuit 9 is set to the upper limit pressure which is the upper limit of the appropriate pressure range according to the type of hot water. It is possible to accurately detect that the pressure has exceeded the pressure level, and that the pressure level has fallen below the lower limit pressure level, which is the lower limit of the appropriate pressure range according to the type of hot water, and that water leakage has occurred. The leak can be detected accurately, and the leak can be detected when a certain amount of leak has occurred regardless of the type of 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 properly 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, if the upper limit pressure level is set slightly higher than the overpressure level of the overpressure relief valve 11, double Therefore, the safety of the entire hot water system can be improved, which is very useful.

[0044]

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 according to the type of hot water, and the pressure level in the circulation circuit is set to the upper limit. If the pressure exceeds the upper limit pressure level according to the type of hot water, it is determined that a pressure abnormality has occurred. Therefore, even if the installation conditions are different and the type of hot water is different, quickly and accurately detect the pressure abnormality with the same detection accuracy. Thus, the reliability of pressure 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 according to the type of the hot water, and the pressure level in the circulation circuit is set according to the type of the hot water. If the pressure exceeds the lower limit pressure level, it is determined that a pressure abnormality has occurred. Therefore, even if the installation conditions are different and the type of hot water is different, the pressure abnormality can be detected quickly and accurately with the same detection accuracy, and the pressure abnormality can be detected. The reliability of detection can be improved.

According to the third aspect of the present invention, whether the pressure level in the circulation circuit is equal to or higher than 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 Hot water type selection means 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 AA02 BB00 BB01 BB04 BC03 BC16 BC26 DE05 DF11 DG01 DG05 DG10

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 hot water type selecting means for selecting a type of hot water, and a hot water type selecting means. An abnormal pressure level setting means for setting an upper limit pressure level according to the selected type of hot water, and comparing a pressure level detected by the pressure sensor with an upper limit pressure level set by the abnormal pressure level setting means, to determine a pressure abnormality. A pressure abnormality detection device for a hot water system, comprising: a pressure abnormality determination unit that determines presence / absence. 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 sensor for detecting a pressure level in the circulation circuit, hot water type selecting means for selecting the type of hot water, and a hot water type selecting means. An abnormal pressure level setting means for setting a lower limit pressure level according to the selected type of hot water; and comparing a pressure level detected by the pressure sensor with a lower limit pressure level set by the abnormal pressure level setting means, to determine a pressure abnormality. A pressure abnormality detection device for a hot water system, comprising: a pressure abnormality determination unit that determines presence / absence. 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.