JPH05263992A - Condensate exhauster - Google Patents

Abstract

PURPOSE:To exhaust condensate alone irrespective of pressure on both primary and secondary sides. CONSTITUTION:In a device in which a float 29 is set up in a condensate storage chamber 3 provided with an inflow port 4 and a reduced port 5 of condensate and an inlet port 8 and a circulating port 9 of a high pressure operating fluid, an air inlake valve 10 for opening or closing the inlet port 8 and an exhaust value 11 for opening or closing the circulating port 9 are connected to the float 29, and also check valves 6, 7 are arranged in the inflow port 4 and the reduced port 5, a double seat valve consisting of two valve seats 18, 19 and two valve bodies 20, 21 is set up in the lower part of the condensate storage chamber 3. This double seat valve is connected to a float 21 so as to close this double seat valve when the condensate storage chamber 3 is in a specified low level and to open it by means of a rise in the water level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate discharge device for discharging condensate generated in a steam piping system and for sending the condensed water under pressure to a boiler or a waste heat utilization device. Condensate condensed in the steam-using device is usually discharged by a steam trap. However, if the secondary pressure is higher than the primary pressure, such as when the condensate is collected in a high-pressure location such as a boiler or waste heat utilization device, or when the condensate in a vacuum is discharged into the atmosphere, The steam trap cannot discharge condensate.

[0002]

Therefore, when the pressure on the secondary side is higher than the pressure on the primary side, a condensate discharge device as shown in Japanese Utility Model Laid-Open No. 147228/50 is used. This is because the condensate pool chamber that has a condensate inlet and return port, a high-pressure operating fluid inlet and a circulation port, has an open or closed float that floats and descends with the water level, and opens and closes the inlet port. The valve and an exhaust valve that opens and closes the circulation port are connected to the float, and the check valve installed at the inlet and the return port cooperates with each other until the condensate chamber reaches a predetermined high water level. Is closed and the circulation port is opened to introduce the condensate from the inflow port, and when a predetermined high water level is reached, the circulation port is closed and the introduction port is opened to discharge the condensate from the reduction port.

[0003]

In a steam using apparatus, for example, a heat exchanger for heating a fluid to be heated with steam, the steam pressure is maintained so that the temperature of the fluid to be heated output from the heat exchanger is kept constant. Is controlled and supplied to the heat exchanger, and the primary pressure may become higher or lower than the secondary pressure. In the above, when the primary side pressure becomes higher than the secondary side pressure, the check valve arranged at the reducing port is always open, so that there is a problem that vapor flows out.

The technical problem of the present invention is therefore to allow only the condensate to be discharged or pumped, regardless of the pressure on the primary side and the secondary side.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problem is a recovery means having a condensate inlet and a reduction inlet, a high-pressure operating fluid inlet and a circulation inlet. An open or closed float that floats and descends with the water level is placed in the water pool, and an intake valve that opens and closes the inlet and an exhaust valve that opens and closes the circulation port are connected to the float, and placed at the inlet and return port. Due to the cooperative action with the check valve, the inlet is closed and the circulation port is opened to introduce the condensate from the inlet until the condensate reservoir reaches a predetermined high water level. In the condensate discharge device that closes the circulation port and opens the introduction port to discharge the condensate from the return port, 2
A double-seat valve consisting of one valve seat and two valve bodies is arranged. The double-seat valve closes when the condensate reservoir chamber has a predetermined low water level, and the double-seat valve opens when the water level rises. It is a combination of double-seat valves.

[0006]

The operation of the above technical means is as follows.
When the primary side pressure is lower than the secondary side pressure, the check valve placed at the return port and the intake valve that opens and closes the inlet port are closed and placed at the inflow port until the condensate chamber reaches a predetermined high water level. The check valve and the exhaust valve that opens and closes the circulation port are open. Condensate flows from the inlet into the condensate chamber and flows upward as the water level rises.
To emerge. The two valve seats of the double-seat valve connected to the float due to the floatation of the float separate from the two valve seats to connect the condensate reservoir chamber and the return port, but a check valve placed at the return port. Keeps the valve closed. Then, when the condensate pool chamber reaches a predetermined high water level, the intake valve opens and the exhaust valve closes. The high-pressure operating fluid introduced from the inlet increases the pressure in the condensate reservoir chamber, and the check valve at the reducing port opens to discharge the condensed water from the reducing port. The float descends as the water level drops due to the discharge of condensed water, and when it descends to a predetermined position, the intake valve closes and the exhaust valve opens.
Further, the two valve elements of the double-seat valve are seated on the two valve seats to shut off the condensate reservoir chamber and the return port, and the check valve at the return port is closed to stop the discharge of the condensate. Then, the condensate flows into the condensate reservoir again. If the primary pressure is higher than the secondary pressure,
The check valves located at the inlet and the return port are both open. The float ascends and descends with the water level in the condensate reservoir chamber, and accordingly, the two valve elements of the double-seat valve are seated on or away from the two valve seats to discharge the condensate.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). An upper lid 2 is attached to the main body 1 with a bolt (not shown) to form a condensate storage chamber 3 inside. A condensate inlet 4 communicating with the condensate reservoir 3 is formed in the upper part of the main body 1, and a reducing port 5 is also formed in the lower part. Check valves 6 and 7 are arranged at the inlet 4 and the return port 5, respectively. Lid 2
An inlet 8 and a circulation port 9 for the high-pressure operating fluid are formed in the. The inlet port 8 communicates with the condensate reservoir chamber 3 via the intake valve 10, and the circulation port 9 communicates with the condensate reservoir chamber 3 via the exhaust valve 11.
The intake valve 10 is formed of an intake valve seat 12 and an intake valve body 13 which is seated on and off the intake valve seat 12 to open and close. The exhaust valve 11 is formed of an exhaust valve seat 14 and an exhaust valve body 15 which is seated on the exhaust valve seat 14 to open and close.

An opening 16 is formed at the lower end of the condensate reservoir chamber 3,
The lower lid 17 is attached and closed with bolts (not shown). An upper valve seat member having an upper valve seat 18 formed at the upper end and a lower valve seat member having a lower valve seat 19 screwed to the upper valve seat member and having an upper end formed with a lower valve seat member are disposed in the opening 16 and held by the lower lid 17. To do. Upper valve seat 18
An upper valve body 20 which is seated on and off the lower valve body 19 and a lower valve body 21 which is seated on and off the lower valve seat 19 are arranged on the outer circumference of the valve shaft pipe 23 with a connecting pipe 22 interposed therebetween. The upper end of the valve shaft tube 23 is brought into contact with the stepped part of the float shaft 24 on the stepped part of the shaft tube 23, and the nut 25 is screwed and fixed to the lower end of the valve shaft tube 23. Each of the upper valve body 20 and the lower valve body 21 is provided with three blades to guide the inside of the upper valve seat member and the lower valve seat member. The float shaft 24 penetrates the valve shaft pipe 23 with a gap 26, and has a nut 27 at the lower end.
Are screwed together. A through hole 2 that connects the condensate reservoir chamber 3 and the lower space of the lower valve body 20 to the valve shaft tube 23 through a gap 26.
8 is formed.

A closed float 29 that floats and descends with the water level is housed in the condensate storage chamber 3. A lever 30 is attached to the float 29, and a connecting member 31 and a flow are attached to the lever 30.
The shaft 24 is connected by the pin 32. The tip of the lever 30 is rotatably attached to the attachment member 33 fixed to the lid body 2 with a pin 34. The pin 34 serves as a fulcrum of the float 29. A play portion 35 is provided on the upper end of the connecting member 31, and the valve rod 36 of the intake valve body 13 and the exhaust valve body 15 are connected by a pin 37.

When the primary pressure of the check valve 6 arranged at the inlet 4 is lower than the secondary pressure of the check valve 7 arranged at the return port 5, the condensate reservoir chamber 3 reaches a predetermined high water level. Then, as shown in the drawing, the intake valve body 13 is separated from the intake valve seat 12, the intake valve 10 is opened, the exhaust valve body 15 is seated on the exhaust valve seat 14, and the exhaust valve 11 is closed. The upper valve body 20 and the lower valve body 21 of the double-seat valve are separated from the upper valve body 18 and the lower valve seat 19, respectively, and communicate the condensate reservoir chamber 3 and the return port 5. The high-pressure operating gas flows from the inlet port 8 into the condensate reservoir chamber 3 through the intake valve 11,
The check valve 7 of the return port 5 opens due to the pressure increase in the condensate reservoir chamber 3, and the condensate is discharged from the return port 5. The float 29 descends as the water level is lowered due to the discharge of condensed water, and the connecting member 31 and the float shaft 24 are descended via the lever 30.
Then, the float 29 descends to a predetermined position, and the play portion 3
When the own weight of the float 29 acts on the valve rod 36 via 5, the valve rod 36 is lowered, the intake valve 10 is closed, and the exhaust valve 11 is opened. When the intake valve 10 is closed and the exhaust valve 11 is opened, the pressure in the condensate reservoir chamber 3 is gradually reduced, the condensate is discharged due to the residual pressure, and the float 29 is further lowered to the double seat position. The upper valve body 20 and the lower valve body 21 of the valve are seated on the upper valve body 18 and the lower valve seat 19, respectively, and the condensed water reservoir chamber 3 and the return port 5 are connected.
And the check valve 7 of the return port 5 is closed to stop the discharge of the condensed water. Then, the check valve 6 of the inflow port 4 opens and the condensed water flows into the condensed water reservoir chamber 3. The float 29 floats as the water level rises due to the inflow of condensed water, and the connecting member 31 and the float shaft 24 are raised via the lever 30. At this time, as the float 29 floats, the upper valve body 20 and the lower valve body 21 of the double-seat valve are separated from the upper valve body 18 and the lower valve seat 19, respectively, so that the condensate reservoir chamber 3 and the return port 5 can be communicated with each other. However, the check valve 7 of the return port 5 remains closed. Then, the float 29 floats up to a predetermined position and floats on the valve rod 36 through the play portion 35.
When the buoyancy of the valve 29 acts, the valve rod 36 is raised, the intake valve 10 is opened, the exhaust valve 11 is closed, and the state shown in the drawing is restored. Thereafter, the above process is repeated.

If the primary pressure is higher than the secondary pressure,
Both the check valve 6 and the check valve 7 are open. Condensate flows into the condensate reservoir chamber 3 from the inlet 4, and as the water level rises, the float 2
9 floats up and flows through the lever 30 to the connecting member 31 and the connecting member 31.
The shaft 24 is raised. Due to the rise of the float shaft 24, the upper valve body 20 and the lower valve body 21 of the double-seat valve separate from the upper valve body 18 and the lower valve seat 19, respectively, so that the condensate reservoir chamber 3 and the return port 5 communicate with each other. Condensate is discharged from the return port 5. The float 29 descends as the water level decreases due to the condensate discharge, and the upper valve body 20 and the lower valve body 21 of the double-seat valve are seated on the upper valve body 18 and the lower valve seat 19, respectively. The return port 5 is shut off.

[0012]

The present invention produces the following unique effects. As described above, according to the present invention, the double-seat valve including the two valve seats and the two valve bodies is arranged in the lower part of the condensate reservoir chamber, and the double-seat valve is provided when the condensate reservoir chamber has a predetermined low water level. Since the double-seat valve is connected to the float so that the double-seat valve opens when the water level rises, the condensate discharge device can discharge or condense only condensed water regardless of the pressure on the primary and secondary sides. Can be obtained. In the double-seat valve, the fluid pressure is symmetrically applied to the two valve elements to cancel each other, so that the two valve elements can be separated from and seated on the two valve seats with a small operating force, so that a large amount of condensed water is discharged or pumped. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a condensate discharge device according to an embodiment of the present invention.

[Explanation of symbols]

 3 Condensate chamber 4 Inlet 5 Return port 6 Check valve 7 Check valve 8 Inlet 9 Circulation port 10 Intake valve 11 Exhaust valve 18 Upper valve seat 19 Lower valve seat 20 Upper valve body 21 Lower valve body 23 Valve shaft Pipe 24 Float shaft 26 Gap 28 Through hole 29 Float

Claims (1)

[Claims] 1. An open or closed float, which floats and descends with the water level, is arranged in a condensate reservoir having a condensate inlet and a return port, a high-pressure operating fluid inlet and a circulation port, and the inlet is opened and closed. The intake valve and the exhaust valve that opens and closes the circulation port are connected to the float, and the check valve located at the inflow port and the return port cooperates with each other until the condensate chamber reaches a predetermined high water level. In the condensate discharge device that closes the introduction port and opens the circulation port to introduce the condensate from the inflow port, closes the circulation port when the predetermined high water level is reached, and opens the introduction port to discharge the condensate from the reduction port, A double-seat valve consisting of two valve seats and two valve bodies is placed in the lower part of the condensate chamber, the double-seat valve closes when the condensate chamber is at a predetermined low water level, and the double-seat valve rises when the water level rises. Condensate discharge device with a double seat valve connected to the float so that it opens.