JPH0427459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a monitoring device for a circulating constant temperature water tank.

<Problems to be Solved by the Invention> Conventionally, a circulating constant temperature water tank that has a heat exchanger and a turbo pump and forms a constant temperature water circulation pipe has a problem in that the heat exchanger in the circulation pipe is overheated or Although anti-freezing equipment was sometimes installed, there was no unified storage system for the liquid circulation system, and as a result, there was a lack of priming water when starting the pump, or the pipes were blocked due to disconnection of the pipe hose or foreign matter. If constant-temperature water no longer circulates normally, accidents such as pumps running dry and heaters running dry may occur, resulting in damage to the equipment.

The present invention aims to solve the above problem by providing a monitoring device that unifies the circulation pipe system to prevent damage to the device due to the occurrence of the above-mentioned accident.

<Structure of the Invention> The present invention provides a constant-temperature water circulation device having a heat exchanger and a turbo pump and forming a conduit for circulating constant-temperature water. Monitoring that includes a pressure sensor that measures and displays pressure, and that when the pressure sensor detects an abnormality in pressure due to poor circulation of constant-temperature water, the operation of the pump and heat exchanger is stopped or an alarm for stopping is issued. A monitoring device for a constant-temperature water circulation pipe in a constant-temperature water tank is characterized by being equipped with a mechanism.

<Example> Examples will be described below based on the drawings.

Figure 1 shows the configuration of a circulating type constant temperature water tank. A turbo pump 3 for circulating constant temperature water is arranged between a constant temperature water tank 1 and a heat exchanger 2, and a pipe line for constant temperature water circulation is connected between each with a hose or the like. It forms 4. The heat exchanger 2 includes a heater 5 for heating adjustment and a cooler 6, and a control unit that compares the difference between the temperature of the circulating water detected by the temperature sensor 7 installed in the pipe 4 or the water tank 1 and the set temperature. 8 controls the operation of the heater 5 and cooler 6 to constantly circulate constant temperature water at a set temperature.

FIG. 2 shows a flowchart of the monitoring device, in which a line 4 is connected to the suction side of the turbo pump 3 in the line 4.
A pressure sensor circuit 9 is provided that detects the internal pressure and displays the flow of circulating constant temperature water in the pipe 4 or indicates an abnormality according to the detected pressure. The pressure sensor circuit 9 includes a sensor member 11 that is connected to a capillary tube 10 that branches into the pipe line 4 and measures the pressure inside the pipe line 4, and an amplifier section 12 that amplifies the measured pressure signal of the sensor member 11. and a display section 13 that converts and displays the signal amplified by the amplification section 12 into analog or digital form.
3 is an upper limit activation alarm unit that is activated by inputting an amplified signal value measured in the event of poor circulation and issues a warning light, buzzer, etc. to stop or stop the operation of the heat exchanger 2 and pump 3. 14 and a lower limit activation alarm section 15 are connected in parallel.

Although the relationship between the flow rate of circulating water and the negative pressure generated in the suction side pipe 4 differs depending on the output of the pump, it has a general correlation as shown in the graph of Figure 3. . When the pump output is constant and there is no load on both the suction and discharge sides, the maximum flow rate becomes the maximum value of negative pressure (point P), and then as the load on the discharge side increases, the relationship between flow rate and pressure becomes proportional. However, when the discharge side load reaches the maximum (at the time of occlusion), each of them shows a value of 0 (curve a). On the other hand, when the load on the suction side increases, the relationship between flow rate and pressure is inversely proportional (curve b) until the load on the suction side reaches its maximum (at the time of occlusion) and the flow rate reaches 0 (point K). However, in a circulation type constant temperature device, a load is already generated due to the connections of hoses forming the pipeline, so even if the pump output is the same, the flow rate corresponding to the same pressure will be a low value (point P′, curves a′, b′). It is also possible to use this relationship to calculate and convert the detected pressure and display the flow rate of the circulating water on the display unit 14.

The sensor member 11 and the amplifying section 12 are connected to the difference in the output of each pump 3 used in the constant temperature device and to the conduit 4.
It is possible to adjust the measured pressure to be calculated and displayed as a flow of constant temperature water in the pump 3 according to the load inside the pump 3, and the alarm section 14 and the alarm section 1
The operating values of No. 5 can be adjusted and set so as to be activated by inputting arbitrary signal values at the upper and lower pressure limits that occur when constant temperature water circulation is poor. Furthermore, as long as a small amount of constant-temperature water is being circulated, the circulation-type constant temperature device can prevent accidents by activating individual safety devices. The alarm is set to activate.

<Operation of the invention> With the above configuration, the monitoring device has a negative pressure value in the capillary tube 10 generated by the suction pressure in the conduit 4 according to the flow of the circulating constant temperature water when the circulating water is circulating well. is measured and amplified by calculation to display on the display unit 13 that constant-temperature water is flowing, but the bending of the hose and the load caused by the obstructions, etc., occur in the pipe line 4, resulting in poor circulation and the pipe line 4 finally becoming blocked. When the circulation of constant temperature water stops, and if it is on the suction side, the negative pressure inside the pipe 4 will increase abnormally, causing a signal to be sent from the sensor member 11 to be measured to the amplifying section 12 and then to the display section 13. Upon inputting the value, the upper limit activation alarm unit 14 is activated to stop the heat exchanger 2 and pump 3 or issue an alarm, and if the blockage in the pipe line 4 is on the discharge side, the pressure in the pipe line 4 is reduced to 0.
Therefore, the lower limit value activation alarm section 15 similarly operates to stop the heat exchanger 2 and pump 3 or issue an alarm.

Note that the turbo pump 3 requires priming water when starting due to its structure, but when the pump 3 is running dry due to lack of priming water, the pressure inside the pipe line 4 becomes 0, so the lower limit is the same as when the discharge side pipe is blocked. Value action alarm part 1
5 will be activated to alert you to poor circulation.

An embodiment in which a monitoring device is provided on the suction side of the pump 3 has been described above, but even if this monitoring device is provided on the discharge side, the detected pressure will be a positive pressure, and when the suction side pipe is blocked. This device has the same structure and function as the case where it is installed on the suction side, except that the circuit of the monitoring device needs to be changed slightly because the pressure level when the discharge side pipe is blocked is reversed. .

<Effects of the Invention> As described above, the present invention provides an upper limit activation alarm section and a lower limit value that are activated by separately detecting the upper and lower limits of pressure in a pressure sensor that detects poor circulation in a constant temperature water circulation pipe. Since the system is equipped with an activation alarm section, it is possible to detect an abnormality and issue an alarm to stop the device or stop it, even if the pressure rises or falls due to differences in the causes of poor circulation. effective. By displaying whether the upper limit or lower limit alarm is activated, the effect is that the location of poor circulation can be immediately discovered and repairs can be made quickly.

In addition, since the detected pressure is calculated and the flow rate of constant temperature water is displayed, by managing this, the status of the pipes and pumps can be read and preliminary inspection and maintenance can be carried out efficiently. .

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a constant temperature water tank equipped with the monitoring device of the present invention, Fig. 2 is a flowchart of the monitoring device circuit, Fig. 3 is a correlation graph between pressure and flow rate, and Fig. 4 is the display surface configuration of the display section. A front view showing an example, 1 is a water tank, 2 is a heat exchanger, 3 is a turbo pump, 4 is a pipe line, 5 is a heater, 6 is a refrigerator, 7 is a temperature sensor,
8 is a control unit, 9 is a pressure sensor circuit, 10 is a thin tube,
11 is a sensor member, 12 is an amplification unit, 13 is a display unit, 13a is a pressure or flow rate indicator, 1
3b and 13c are warning lights, 14 is an upper limit value activation alarm section, and 15 is a lower limit value operation alarm section.

Claims (1)

[Claims] 1. A heat exchanger and a turbo pump are provided in the middle of a constant temperature water circulation pipe of a constant temperature water tank, and a pressure sensor is provided on the suction side or discharge side of the pump to measure the suction pressure or discharge pressure of the pump. , a monitoring device for a constant temperature water circulation device, wherein the pressure sensor is provided with a monitoring mechanism that detects pressure abnormality due to poor circulation of constant temperature water and issues an alarm to stop or stop the heat exchanger and pump, the pressure sensor The sensor is equipped with a display section that calculates the measured pressure value and displays the flow rate, and also includes an upper limit activation alarm section and a lower limit activation alarm section that separately detect the upper and lower limits of pressure abnormalities that lead to poor circulation. A monitoring device for a constant-temperature water circulation pipe in a constant-temperature water tank, characterized in that it is equipped with a monitoring mechanism.