JPH0788920B2 - Steam trap device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steam trap device for mainly discharging condensed water, that is, condensed water generated in a steam using device.

In a steam-using device, the object to be heated is usually heated or dried using the latent heat of steam. In this case, heat must be uniformly supplied to the object to be heated. When the heat supply becomes non-uniform, heating unevenness and drying unevenness occur on the object to be heated, and it becomes impossible to maintain a constant quality of the object to be heated as a product.

<Prior Art> Conventionally, a so-called steam trap has been used in order to quickly discharge the condensate generated in the steam-using device to supply heat to the object to be heated as uniformly as possible.

The steam trap is a type of automatic valve that automatically discharges only the condensate generated after the steam has performed its work.By discharging the condensate generated by the steam-using device as soon as it is generated The object to be heated is heated by the large latent heat of the steam to enable uniform heating.

<Problems to be Solved by the Present Invention> Conventionally used steam traps include a mechanical type that operates by a difference in specific gravity of steam and condensed water and a thermostatic type that uses a temperature difference depending on the operating principle. There is a limit to the maximum amount of condensate that can be discharged,
There was a problem that the generated condensate was retained depending on the condensate generation situation. If the condensate generated in the steam using device stays without being discharged, it becomes impossible to heat the object to be heated with the latent heat of the steam, and the heat quantity to be held will be heated by a small amount of sensible heat. It becomes impossible to heat uniformly.

In order to respond to fluctuations in the amount of condensate generated in the steam using device, a separate pipe is installed as a bypass flow path in parallel with the steam trap, and this bypass flow path is opened when the amount of condensed water cannot be discharged by the steam trap. Condensate is also discharged, but the bypass flow path is operated after detecting that the amount of generated condensate cannot be discharged by the trap due to an abnormality in the object to be heated. It is not possible to keep efficiency at the highest level.

Therefore, the technical problem of the present invention is to quickly discharge the condensate generated in the steam using device regardless of the amount of condensate generated, and maintain the heating efficiency of the steam using device at the maximum level.

<Means for Solving the Problem> The technical means of the present invention taken to solve the above technical problems is a steam trap and a valve means arranged in parallel on the secondary side of a steam using device, and the valve The pressure detecting means for detecting the fluid pressure on the primary side of the means and the temperature detecting means for detecting the temperature are attached, and a conversion section for converting the saturation temperature at the pressure from the detected value of the pressure detecting means is provided, A control unit for issuing a control signal for opening and closing the valve means is provided by the signal of 1) and the signal from the conversion unit.

<Operation> By arranging the steam trap and the valve means in parallel on the secondary side of the steam-using device, the condensate is discharged only from the steam trap when the amount of condensate generated is relatively small and the amount is relatively small. When a large amount is generated, the valve means is opened together with the steam trap to discharge the condensate. That is, the saturation temperature is converted by the conversion unit from the pressure value detected by the pressure detection means,
When the temperature value detected by the temperature detecting means is lower than the converted saturation temperature by a desired value, a control signal for controlling the valve opening is issued from the control part, the valve means is opened, and the condensate is discharged. Steam has a correlation between pressure and temperature, and if it is lower than the saturation temperature in a certain pressure state, it is in a condensate state. On the other hand, when the temperature value detected by the temperature detecting means is equal to the saturation temperature or is within the desired value range, the control section issues a valve closing signal to the valve means, and the valve means keeps the valve closed and the steam Prevent leakage.

<Effects of the invention> Regardless of the amount of condensate generated, the steam trap and valve means are used to distinguish whether the existing fluid is condensate or steam depending on the detected temperature, and discharge only the condensate at the temperature to be discharged. The condensate does not accumulate in the steam-using device. Therefore, the heating rate of the steam using device can be maintained at the maximum level.

<Example> An example showing a specific example of the above technical means will be described (see FIG. 1).

The valve means 2 and the steam trap 6 are mounted in parallel on the secondary side, that is, the outlet side of the steam using device 1. The steam trap 6 is attached via the bypass channel 7. The steam trap 6, the valve means 2, the pressure sensor 3 as the pressure detecting means attached to the primary side of the valve means 2, that is, the inlet side, the temperature sensor 4 as the temperature detecting means, and the pressure signal from the pressure sensor 3 Conversion unit for conversion (not shown)
A steam trap device is formed with the control unit 5 containing the.

A steam supply pipe 10 for supplying steam to the steam using apparatus 1 is connected via a pressure reducing valve 11. Further, a heated object supply pipe 12 for supplying the heated object to the steam using device 1 and a heated object take-out pipe 13 for taking out the heated object are connected.

The controller 5 is connected to the sensors 3 and 4 and the valve means 2 by signal plugs 15, 16 and 17, respectively. The valve means 2 is an actuator section 2a
It is possible to use a self-powered automatic control valve equipped with.

Next, the operation will be described.

The object to be heated is latently heated by the steam supplied from the steam supply pipe 10 and taken out from the object to be heated take-out pipe 13. The steam from which the heat has been taken by the latent heat is condensed and reaches the pressure and temperature sensors 3 and 4 attached to the secondary side of the steam using apparatus 1, the valve means 2 and the steam trap 6. If the steam-using device 1 is in a normal operating state and the amount of generated condensate is also in a steady state, the condensate flowing down is discharged from the steam trap 6. When the amount of condensed water that cannot be discharged by the steam trap 6 is flowing down, or when the steam trap 6 cannot be discharged due to a failure or the like, the pressure in the pipe is detected by the pressure sensor 3, and the control unit 5 The conversion temperature inside converts the saturation temperature at that pressure. The temperature detected by the temperature sensor 4 is compared with the above-mentioned converted saturation temperature, and a desired value, for example, 2 ° C. or 6 is calculated from the saturation temperature.
When the temperature is low, the control unit 5 issues a valve opening control signal to the valve means 2 to open the valve means 2 and discharge the condensate.

As described above, according to the present invention, regardless of the amount of condensed water generated in the steam using apparatus 1, it can be promptly discharged without staying.

Further, in this embodiment, since the steam trap 6 is provided in parallel with the valve means 2, the normal condensate discharge is performed by the steam trap 6, and the valve means 2 is used when the amount of generated condensate suddenly increases. By opening the valve and discharging the condensate, the valve opening frequency of the valve means 2 decreases and the life of the valve means 2 can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a steam trap device of the present invention. 1: Steam using device, 2: Valve means 3: Pressure sensor, 4: Temperature sensor 5: Control part, 6: Steam trap 10: Steam supply pipe, 12: Heated object supply pipe

Claims (1)

[Claims] 1. A steam trap and valve means are arranged in parallel on the secondary side of a steam using device, and pressure detecting means for detecting the fluid pressure on the primary side of the valve means and temperature detecting means for detecting the temperature are attached. A conversion unit for converting the saturation temperature at the pressure from the detection value of the pressure detection unit is provided, and at least a control unit for issuing a control signal for opening and closing the valve unit by a signal from the temperature detection unit and a signal from the conversion unit is provided. Steam trap device.