JPH11201393A - Condensate discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensate discharging device which can surely discharge condensate generated in a steam-using device without stagnating the condensate. SOLUTION: A steam trap 4 is installed on the outlet side of a steam-using device 1. A differential pressure regulating valve 7 is arranged in parallel to the steam trap 4. An upper differential pressure chamber 15 of the differential pressure regulating valve 7 is connected to the inlet side of the steam trap 4 via a communication passage 20, while a lower differential pressure chamber 16 is connected to the outlet side of the steam strap 4 via a communication passage 21. Through a pipeline 25, the differential pressure regulating valve 7 and a fluid force-feeding means 26 are connected together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for discharging air as non-condensable gas staying in a steam-using device and condensate generated by condensing steam from the steam-using device. Normally, in a steam-using apparatus, in order to improve the heating efficiency by steam, air stagnating inside the apparatus and condensate generated by heating the steam are quickly discharged out of the apparatus.

[0002]

2. Description of the Related Art Conventionally, a so-called steam trap has been used to discharge initial air and condensate. Various types of steam traps are used,
If condensate flows in using the specific gravity difference between steam and condensate, float floats up and opens the valve port to discharge condensate out of the system, bimetal, bellows, etc. A device which incorporates a temperature responsive element and discharges condensate or air having a predetermined temperature lower than that of steam is used.

[0003]

A conventional steam trap cannot reliably discharge condensed water when the pressure difference between the inlet side and the outlet side of the steam trap becomes small, so that steam cannot be discharged. There was a problem that the condensed water stayed in the used equipment. When the steam use pressure is low and there is almost no difference from the atmospheric pressure, or when the load in the steam use device fluctuates and the pressure in the steam use device drops and there is no pressure difference from the outlet side, or If the pressure on the outlet side of the used equipment becomes higher than the pressure on the inlet side for some reason, the condensate generated in the steam using equipment cannot flow down to the steam trap without fail and stays. It is.

[0004] It is therefore an object of the present invention to provide a condensate discharge device that can reliably discharge condensate generated in a steam-using device or the like and that does not accumulate condensate.

[0005]

The means of the present invention taken to solve the above-mentioned problems are the ones in which a steam trap is attached to a steam-using device to discharge a non-condensable gas or condensed condensate. A differential pressure valve that opens and closes due to the pressure difference between the inlet side and the outlet side of the steam trap is arranged in parallel with the steam trap, the inlet side of the differential pressure valve communicates with the inlet side of the steam trap, and the outlet side is liquid. It is connected to the pumping means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A steam trap is provided by arranging a differential pressure valve in parallel with a steam trap, and connecting the inlet side of the differential pressure valve with the inlet side of the steam trap and connecting the outlet side to a liquid pressure feeding means. When the pressure difference between the inlet side and the outlet side becomes smaller and reaches a predetermined differential pressure, the differential pressure valve opens,
The inlet side of the steam trap communicates with the liquid pumping means, and the condensed water at the inlet side of the steam trap, which could not be discharged and stayed, flows down into the liquid pumping device and is discharged out of the system.

When the pressure difference between the inlet side and the outlet side of the steam trap is normal, that is, when the inlet side is sufficiently higher than the outlet side, the differential pressure valve closes and does not communicate with the liquid pumping means. The steam trap can discharge the condensed water from the outlet side by itself according to the pressure difference as before.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steam supply pipe 2 for supplying steam for heat exchange to a steam using apparatus 1 is connected via a pressure control valve 3. A steam trap 4 is attached below the steam-using device 1.
The steam trap 4 automatically condenses steam generated in the steam-using device 1 as condensed water or automatically discharges air, which is a non-condensable gas, to the outside.

A differential pressure valve 7 is arranged in parallel with the steam trap 4, and its inlet communicates with the inlet of the steam trap 4 via a pipe 17. The liquid pressure feeding means 26 is connected to the outlet side of the differential pressure valve 7 via a pipe 25. The differential pressure valve 7 has a valve body 11 that defines an inlet 9 and an outlet 10 movably arranged up and down. A coil spring 13 and a diaphragm 14 are attached to a valve rod 12 connected to the valve body 11, and an upper differential defined by the diaphragm 14. The pressure chamber 15 communicates with the inlet side of the steam trap 4 through the communication passage 20, and the lower differential pressure chamber 16 also communicates with the communication passage 2.
1 communicates with the outlet side of the steam trap 4.

The differential pressure valve 7 detects the differential pressure between the inlet side and the outlet side of the steam trap 4 by the diaphragm 14, and when the differential pressure becomes smaller than a predetermined value, the diaphragm 14 is displaced upward and the valve body 11 is displaced upward. Is also displaced upward, the entrance 9 and the exit 1
0, and connects the inlet side of the steam trap 4 and the liquid pressure feeding means 26 via the pipes 17 and 25.

A part of the steam supply pipe 2 is branched to provide a steam branch pipe 5, which is connected via a valve 6 to a steam inlet 27 of a liquid pressure feeding means 26. In the present embodiment, the liquid pumping means 26 is an example in which a liquid condensed as a liquid stored therein is pumped to a predetermined location by high-pressure steam introduced from the steam inlet 27. Alternatively, as the liquid pressure feeding means 26, a combination of a tank for storing condensed water and a circulation pump for driving or stopping according to the liquid level in the tank can be used.

The liquid pressure feeding means 26 is provided with a condensate inlet 28 and a condensate pressure feed port 29, and an air communication port 30 on the side of the steam inlet 27, and connects the condensate inlet 28 and the differential pressure valve 7 to a pipeline. 2
5 through a check valve 22, and a condensate feed line 29 through a check valve 23 to a condensate pressure feed port 29.

The liquid pressure feeding means 26 is not shown, but when the condensed water flowing down from the condensate inlet 28 accumulates in a predetermined amount inside, the liquid level detecting means operates to open the vapor inlet 27 and at the same time to open the atmosphere. The communication port 30 is closed, and the condensed water retained by the introduced high-pressure steam is pressure-fed from the condensed water pressure feeding port 29 to a predetermined location via the pressure feeding pipe 24.

Condensate generated by heat exchange in the steam-using device 1 is closed when the pressure on the inlet side of the steam trap 4 is higher than the pressure on the outlet side by a predetermined value. At the same time, it flows down to the steam trap 4 and is automatically discharged from the steam trap 4 to the outside of the system.

The pressure on the outlet side of the steam trap 4 increases or the pressure on the steam-using device 1 side decreases, and the pressure pressure on the inlet side and the outlet side of the steam trap 4 decreases or reverses. When the pressure on the outlet side becomes higher than that on the inlet side, the differential pressure valve 7 is opened, and the inlet side of the steam trap 4 and the liquid pressure feeding means 26 are communicated through the pipes 17 and 25, and the steam trap 4 The condensed water of the steam-using device 1 that has stayed at the inlet side flows down to the liquid pumping means 26, so that the condensed water does not stay in the steam-using device 1.

The condensate flowing down to the liquid pumping means 26 is:
When the liquid accumulates in the main body and reaches a predetermined liquid level, the steam introduction port 27 is opened and the air communication port 30 is closed, and the high pressure steam supplied from the steam branch pipe 5 is fed from the pressure feed pipe 24 to a predetermined location. When the liquid level in the main body is reduced by the pressure feeding, the vapor introduction port 27 is closed and the air communication port 30 is opened, and the inside of the liquid pressure feeding means 26 is brought into the atmospheric pressure state.

[0017]

As described above, according to the present invention, only when the differential pressure between the inlet side and the outlet side of the steam trap becomes smaller than the predetermined differential pressure, the differential pressure valve opens and the liquid pumping means is provided. The condensate can be discharged through the system, and the condensate generated in the steam-using device can be surely discharged out of the system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a condensate discharge device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam use apparatus 2 Steam supply pipe 4 Steam trap 7 Differential pressure valve 11 Valve element 14 Diaphragm 15 Upper differential pressure chamber 16 Lower differential pressure chamber 17, 25 Pipe 20, 20, Communication passage 22, 23 Check valve 24 Pressure feed pipe 26 Liquid pumping means 27 Vapor inlet 28 Condensate inlet 29 Condensate inlet 30 Atmosphere communication port

Claims (1)

[Claims] 1. A steam pressure-reducing valve which is provided with a steam trap for discharging a non-condensable gas or condensed condensate in a steam-using device, wherein the valve is opened and closed by a pressure difference between an inlet side and an outlet side of the steam trap. A condensate discharge device, which is disposed in parallel with a steam trap, wherein the inlet side of the differential pressure valve communicates with the inlet side of the steam trap and the outlet side is connected to a liquid pressure feeding means.