JPH08286766A - Steam consumption device - Google Patents

Abstract

PURPOSE: To control not only steam pressure but also a temperature so as to supply desired steam by inputting set pressure and a set temperature from a setting input means without using a pressure sensor and a temperature sensor. CONSTITUTION: When the set temperature is inputted from a set temperature input means 7, a storage part calculates steam pressure to a set temperature value and the elastic force of a coil spring 15. A motor 17 is rotated and the coil spring 15 is compressed. Then, steam supplied from a steam supply pipe 2 is restricted by a main valve 8 and distilled liquid in a steam pot is heated. Set pressure is inputted from a set pressure input means 6, the elastic force of the coil spring 15 to the set pressure of the storage part is calculated, the elasticity of the coil spring 15 is adjusted and the steam of desired pressure is supplied from a control valve 1 to the steam pot. When pressure drops, a diaphragm 12 is pushed down, a pilot valve 11 is opened, the main valve 8 is opened and the secondary-side of the control valve 1 is maintained to a set pressure value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam consuming device for supplying steam to a steam device through a valve for controlling the pressure and temperature of steam. Specifically, in a chemical device such as a concentrator, a distillation device or a reaction kettle, a medical device such as an autoclave or a sterilizer, or various heating devices, the pressure or temperature of steam is controlled to be heated. The present invention relates to a device for efficiently producing a steel.

[0002]

2. Description of the Related Art Conventionally, in the case of heating various products using steam generated in a boiler, a combination of a so-called automatic control valve, a temperature sensor and a controller has been used. When it is necessary to control not only the temperature but also the pressure of steam, a combination of pressure sensors has been used. The temperature of the heated object or the pressure of steam to be heated is sensed by the temperature sensor or pressure sensor, and the pressure of the heated steam to the steam consuming device is adjusted by adjusting the automatic control valve via the controller. And heating the object to be heated at a predetermined temperature.

[0003]

In the above-mentioned conventional device, a plurality of sensors for sensing temperature and pressure are used.
However, there is a problem in that the device becomes expensive and the sensor and controller have to be connected, which makes the work complicated.

Therefore, a technical object of the present invention is to obtain a steam consuming device which does not require a plurality of sensors and is inexpensive and easy to install.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is a control valve connected to a steam source, and the control valve is provided on one surface of a pressure responsive member. It consists of a pressure reducing valve that receives the fluid pressure on the secondary side and receives the elastic force of the elastic member on the other surface to open and close the main valve through which the steam flows down by the displacement of the pressure responsive member, and the elastic force of the elastic member is adjusted to the pressure reducing valve. The elastic force adjusting means is attached, a storage section for storing the relationship between the elastic force of the elastic member and the set pressure and the set temperature is provided, and setting input means for inputting the set pressure and the set temperature is provided. Is a valve provided with a drive control unit for driving the elastic force adjusting means by a desired amount based on the relationship between the input value and the storage unit, and the control valve is connected to a device that consumes steam.

[0006]

The operation of the above technical means is as follows.
By supplying steam to the steam consuming device via the control valve, the object to be heated in the steam consuming device is steam-heated. In this case, by adjusting the elastic member of the control valve by the elastic force adjusting means, the elastic force applied to the pressure responsive member changes, and the secondary pressure is automatically adjusted so as to balance with the elastic force. The function as a so-called pressure reducing valve controls the secondary side steam pressure of the valve to a desired value.

Steam, more specifically, saturated steam, has a one-to-one relationship between pressure and temperature, and when the steam pressure is determined, the steam temperature is automatically determined. Therefore, when the set temperature of the control valve is input by the setting input means, the elastic force is calculated so as to reach the set temperature from the set temperature in the storage unit, that is, the relationship between the vapor pressure and the elastic force of the elastic member in a one-to-one relationship. The control valve is set by driving the elastic force adjusting means so as to generate the elastic force, and the object to be heated is steam-heated by the steam consuming device while maintaining the steam temperature on the secondary side at the set temperature.

The steam pressure can be maintained at a desired value by inputting a desired set pressure from the setting input means, and the steam temperature can be maintained at a desired value by inputting a desired set temperature.

[0009]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). In this embodiment, an example in which a distillation pot is used as a steam consuming device is shown. In FIG. 1, a control valve 1 and a steam supply pipe 2 for supplying steam to the control valve 1
And a steam pipe 3 for supplying steam to the still pot 30, and a steam pipe 3
Steam trap 31 and cooler 3 attached to the end of the pipe
2 and 2 compose a steam consuming device.

The control valve 1 is, as shown in FIG. 2, a main valve 8 that cuts off the passage of steam, a piston 9 that cooperates with the main valve 8, and a supply of high-pressure steam on the primary side to the upper chamber 10 of the piston 9 that is cut off. Pilot valve portion 11, a diaphragm 12 as a pressure responsive member for driving the pilot valve portion 11, a secondary pressure introducing passage 14 for introducing a secondary side fluid pressure into a lower chamber 13 of the diaphragm 12, and an upper surface of the diaphragm 12. Coil spring 15 acting as an elastic member and adjusting screw 16 as elastic force adjusting means for adjusting the elastic force of the coil spring 15.
And a motor 17 as a drive unit for driving the adjusting screw 16.
And a speed reducer 18.

The drive control section 5 has a built-in storage section (not shown) for storing the relationship between the set pressure of the control valve 1 and the elastic force of the coil spring 15 and the relationship between the pressure of saturated steam and the temperature. The set pressure input means 6 and the set temperature input means 7 are not shown in the figure, but may be any means capable of inputting arbitrary values using a numeric keypad or the like.

In the present embodiment, the coil spring 15 as an elastic member has shown an example in which the elastic force acts in the downward direction of the diaphragm 12, but when the pressure of so-called vacuum vapor below atmospheric pressure is reduced, the elastic force is reduced. It is also possible to use a coil spring that acts in the opposite direction, that is, in the upward direction.

The control valve 1 has a separator 20 for separating condensate as condensed water contained in the high-pressure steam supplied from the steam supply pipe 2, and the condensate thus separated causes the condensate to float and descend. A steam trap portion 23 composed of a float 22 for opening and closing the valve opening 21 is integrally attached.

The distillation pot 30 shown in FIG. 1 has a steam pipe 3 passing inside and is connected to a cooler 32 through a pipe 33 at the upper part, and a distillate (not shown) is put in the inside for steam heating. This evaporates a predetermined component and cooler 32
It is cooled by and condensed.

Next, the operation will be described. When elevating the temperature of the distillate in the distillation pot 30 to evaporate it, first, temperature control is performed so that the distillate reaches a predetermined temperature. That is, when the set temperature is input from the set temperature input means 7 in the drive control unit 5 of the control valve 1, the steam pressure and the elastic force of the coil spring 15 with respect to the set temperature value are calculated by the storage unit in the drive control unit 5, The motor 17 is rotationally driven only to generate this elastic force to compress the coil spring 15. Accordingly, the steam supplied from the steam supply pipe 2 is throttled by the main valve 8 and flows down to the steam pipe 3 on the secondary side as the steam whose pressure is reduced to a set temperature, that is, the steam pressure, and flows down to the distillate in the distillation pot 30. To heat.

When the distillate reaches a predetermined temperature, for example, the boiling point, the temperature of the distillate does not change. Therefore, pressure control is performed instead of temperature control. That is, the set pressure is input from the set pressure input means 6, and the elastic force of the coil spring 15 with respect to the set pressure in the storage unit is calculated in the drive control unit 5 to calculate the coil spring 1.
The elastic force of 5 is adjusted, and the steam having a desired pressure is supplied from the control valve 1 to the still pot 30.

When the pressure in the steam pipe 3 decreases and falls below a set value, the diaphragm 12 is pushed down by the elastic force of the coil spring 15 and the pilot valve 11 opens, so that the high pressure steam on the primary side is transferred to the piston upper chamber 10 And the piston 9 is displaced downward, the main valve 8 is opened to supply more steam to the steam pipe 3, and the secondary side of the control valve 1 is maintained at the set pressure value.

In this embodiment, an example in which the steam pipe 3 passes through the distillation pot 30 to indirectly heat the distillate has been described. However, the heating device directly heats the distillate to directly heat the object to be heated. The same can be carried out in. Further, by preferentially actuating either one of the setting input means 6 and 7, either one of the temperature and the pressure can be mainly controlled and the other can be slavely controlled.

[0019]

EFFECTS OF THE INVENTION By inputting the set pressure or the set temperature from the set input means without using the pressure sensor or the temperature sensor, only the steam pressure can be utilized by utilizing the one-to-one relationship between the steam pressure and the temperature. Not only the temperature but also the temperature can be controlled to supply the desired steam to the steam consuming device.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional configuration diagram of a control valve used in the steam consuming device of the present invention in FIG.

[Explanation of symbols]

 1 Control Valve 2 Steam Supply Pipe 3 Steam Pipe 5 Drive Control Section 6 Setting Pressure Input Means 7 Setting Temperature Input Means 8 Main Valve 12 Diaphragm 15 Coil Spring 16 Adjusting Screw 17 Motor 30 Distilling Pot 31 Steam Trap 32 Cooler

Claims (1)

[Claims] Claim: What is claimed is: 1. A control valve connected to a steam source, wherein the control valve receives secondary side fluid pressure on one surface of the pressure responsive member and elastic force of an elastic member on the other surface to displace the pressure responsive member. A pressure reducing valve for opening and closing a main valve through which steam flows by means of which an elastic force adjusting means for adjusting the elastic force of the elastic member is attached to the pressure reducing valve to store the relationship between the elastic force of the elastic member and the set pressure and set temperature. And a setting input means for inputting the set pressure and the set temperature, and a drive control section for driving the elastic force adjusting means by a desired amount based on the relationship between the input value from the setting input means and the inside of the storage section. A steam consuming device characterized in that the control valve is connected to a device that consumes steam.