JPH04125396A - Steam trap device - Google Patents

Abstract

PURPOSE:To speedily discharge condensed water and hence to keep a heating efficiency at the maximum level by providing a control unit for generating a control signal of opening and closing a valve means on the basis of a signal from a conversion section for obtaining a saturated temperature converted from a pressure and a signal from a temperature detecting means. CONSTITUTION:A steam trap device is composed of a valve means 2 disposed on a secondary side of a steam using equipment 1, a pressure sensor 3 attached on a primary side of the valve means 2, a temperature sensor 4, and a control unit 5 containing a conversion section for converting the pressure signal from the pressure sensor 3. When condensed water in a steam trap 6 cannot be discharged, a pressure in a pipe is detected by a pressure sensor 3, and a saturated temperature at the pressure is obtained in the conversion section of the control unit 5. A temperature detected in the temperature sensor 4 is compared with the saturated temperature. Thus, when the detected temperature is under the saturated temperature, a control signal of opening the valve is transmitted from the control unit 5 to the valve means 2, to thus discharge the condensed water. Therefore, it is possible to speedily discharge the condensed water without staying irrespective of the amount of the condensed water.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steam trap device for mainly discharging condensed water generated in a steam-using device.

Steam-using devices typically use the latent heat of steam to heat, dry, or otherwise process a heated object.

In this case, heat must be uniformly supplied to the heated object. When the heat supply becomes uneven, uneven heating and drying occur in the heated object, making it impossible to maintain a constant quality of the heated object as a product.

<Prior Art> Conventionally, so-called steam traps have been used to quickly discharge condensate generated in steam-using equipment and supply heat to objects to be heated as uniformly as possible.

A steam trap is a type of automatic valve that automatically discharges only the condensate that is generated after steam has done its work. , the object to be heated is heated using the large latent heat possessed by the steam, and uniform heating is possible.

Problems to be Solved by the Invention> Conventionally used steam traps are classified into mechanical types that operate based on the difference in specific gravity between steam and condensate, and thermostatic types that utilize temperature differences, depending on the operating principle. There is a limit to the maximum amount of condensate that can be discharged.
There is a problem in that the generated condensate may stagnate depending on the situation in which the condensate is generated. If condensate generated in steam-using equipment remains without being discharged, the object to be heated cannot be heated by the latent heat of the steam, and the condensate will be heated by the small amount of sensible heat that it possesses, causing the object to be heated to become heated. cannot be heated evenly.

In order to cope with fluctuations in the amount of condensate generated in steam-using equipment, 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 condensate generated reaches a level that cannot be discharged by the steam trap. Although condensate is also discharged, the bypass flow path is operated after detecting a situation where the amount of condensate generated cannot be discharged by the trap due to an abnormality in the heated object. It is not possible to maintain efficiency at the highest level.

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

Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is to arrange a valve means that opens and closes in response to a control signal on the secondary side of the steam using device, A pressure detection means for detecting the pressure of the fluid on the primary side of the valve means and a temperature detection means for detecting the temperature are installed, and a conversion section is provided for converting the saturation temperature at that pressure from the detected value of the pressure detection means, and at least the above-mentioned temperature is provided. A control section is provided which issues a control signal for opening and closing the valve means based on the signal from the detection means and the signal from the conversion section.

<Operation> Condensate can be discharged by opening the valve means disposed on the secondary side of the steam using device. A conversion unit converts the saturation temperature from the pressure value detected by the pressure detection means. When the temperature value detected by the temperature detection means is lower than the converted saturation temperature by a desired value, a control signal for controlling the opening of the valve means is issued from the control section, the valve means is opened, and the condensate is discharged. There is a correlation between pressure and temperature of steam; if the pressure is equal to the saturation temperature in a certain pressure state, it is in a steam state, and if it is lower than the saturation temperature, it is in a condensate state.

On the other hand, if the temperature value detected by the temperature detection means is equal to the saturation temperature or within the desired value range, the control section issues a valve closing signal to the valve means, and the valve means maintains the valve closed and releases steam. Prevent leakage and leakage of hot condensate within desired value ranges.

<Effects of the Invention> Regardless of the amount of condensate generated, it is possible to distinguish whether the existing fluid is condensate or steam based on the detected temperature and to discharge only the condensate at the temperature that should be discharged via the valve means. is possible,
There is no accumulation of condensate in the steam-using equipment. Therefore,
The heating efficiency of steam-using equipment can be maintained at the highest level.

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

A valve means 2 disposed on the secondary side, ie, the outlet side, of the steam using device 1; a pressure sensor 3, serving as a pressure detection means, attached to the primary side, ie, the inlet side, of the valve means 2; and a temperature sensor 4, serving as a temperature detection means. , a control unit 5 incorporating a conversion unit (not shown) for converting the pressure signal from the pressure sensor 3;
and form a steam trap device.

Steam supply pipe for supplying steam to steam usage device 1]O
are 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 control unit 5, each sensor 3, 4, and the valve means 2 are connected by signal lines 15, 16, and 17, respectively. As the valve means 2, an external force type automatic control valve having an actuator section 2a can be used. In this embodiment, a bypass flow path 7 equipped with a conventionally used steam trap 6 is provided in parallel with the valve means 2.

Next, the action will be explained.

The object to be heated is heated latently by the steam supplied from the steam supply pipe 10 and is taken out from the object to be heated take-out pipe 13 .

Heat is removed by latent heat heating, and the steam condenses and reaches the pressure and temperature sensors 3 and 4, the valve means 2, and the steam trap 6 attached to the secondary side of the steam usage device 1. If the steam using device 1 is in normal operating condition and the amount of condensate generated is steady, the condensate flowing down will be collected in the steam trap 6.
is discharged from. When an amount of condensate that cannot be discharged by the steam trap 6 flows down, or when the steam trap 6 is malfunctioning and cannot discharge condensate, the pressure inside the pipe is detected by the pressure sensor 3, and the control unit 5 The conversion section inside converts the saturation temperature at that pressure. The temperature detected by the temperature sensor 4 and the converted saturation temperature are compared, and a desired value, for example 2°C, is determined from the saturation temperature.
If the temperature is lower than 6° C., the control section 5 issues a control signal to open the valve to the valve means 2, and the valve means 2 opens to discharge the condensate.

As described above, according to the present invention, whatever the amount of condensate generated in the steam using device 1, it can be quickly discharged without being retained.

In addition, in this embodiment, by providing the steam trap 6 in parallel with the valve means 2, normal condensate discharge is performed by the steam trap 6, and when the amount of condensate generated suddenly increases, the valve means 2@ : By opening the valve and discharging condensate, the opening slope of the valve means 2 is reduced, and the life of the valve means 2 can be maintained for a long period of time.

[Brief explanation of the drawing]

1: Steam usage equipment 3: Pressure sensor 5: Control section 10: Steam supply pipe 2: Valve means 4: Temperature sensor 6: Steam trap 12: Heated material supply pipe

Claims (1)

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