JPH0131283Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a condensate extraction device for a negative pressure condenser.

(Prior art) In the case of a conventional condensate extraction device for a negative pressure condenser, a height difference is provided corresponding to the negative pressure in the negative pressure condenser from which the condensate accumulated in the negative pressure condenser is taken out, or The suction was done using a vacuum pump that had the ability to overcome the pressure. That is, in the former case, for example, in the case of 0.1 atm operation, there is a problem in terms of space, etc. because the tube must be guided and taken out approximately 9.3 m below. In the latter case, a large-capacity vacuum pump is required, and there are problems such as cavitation and leakage of mechanical seals.

(Problems to be solved by the invention) The present invention has been made in view of the above points, and its purpose is to allow a small-capacity vacuum pump to be used, and to avoid direct contact between rotating parts and sliding parts in the discharge path. It is an object of the present invention to provide a condensate extracting device for a negative pressure condenser, which does not require intervening parts, facilitates selection of materials, and allows for freedom in structure.

(Means for solving the problem) The gist of the present invention is that the negative pressure condenser 2 in which the condensate 1 accumulates
A discharge pipe 4 is led out from the reservoir 3 of the negative pressure condenser 2, and a condensate receiving tank 5 is disposed below the reservoir 3 of the negative pressure condenser 2.
A check valve 6 that opens into the condensate tank 5 and allows the condensate 1 to flow toward the condensate tank 5 is provided in the middle of the discharge pipe 4, while a suction pipe 8 led out from the vacuum pump 7 is inserted into the condensate tank 5. This invention relates to a condensate extraction device for a negative pressure condenser having an open opening.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

FIG. 1 is a diagram showing the principle of the present invention, and if the piston pump 7 is used to take out the condensate (water etc.) 1 from the negative pressure condenser 2, the process will be as follows. That is, when the piston is moved to the right from the left limit, the inside of the cylinder 11 becomes vacuum, and the condensate 1 pushes open the check valve 6 and flows into the cylinder 11, and when it becomes full, the piston is moved to the left. When this is done, the check valve 6 is closed and the check valve 9 is opened, and the condensed liquid is discharged out of the system. Here, a vacuum pump is used to move the piston from the left limit to the right to vacuum the cylinder 11, and high-pressure air is used to move the piston from the right to the left to discharge the condensate. . The above operation is shown in FIG. This is advantageous in terms of heat transfer because it uses air rather than a direct mechanical part.

FIG. 2 shows a first embodiment of the invention.

The negative pressure condenser 2 is for the purpose of condensing steam or storing liquid (water, etc.), and a discharge pipe 4 is led out from a reservoir 3 of the negative pressure condenser 2 in which the condensed liquid 1 is stored. A condensate receiving tank 5 is disposed below the reservoir 3 of the negative pressure condenser 2, and the outlet end of the discharge pipe 4 is opened into the condensate receiving tank 5. Reference numeral 6 denotes a check valve that allows the condensate 1 to flow in the direction of the condensate receiving tank 5, and is disposed in the middle of the discharge pipe 4.
On the other hand, a suction pipe 8 led out from the vacuum pump 7 is opened into the condensate receiving tank 5. 16 is a drain pipe for discharging the condensate 1 accumulated in the condensate receiving tank 5;
A check valve 9 is arranged in the middle of the drain pipe 16. 17
A vent pipe 17 communicates the negative pressure condenser 2 and the condensate receiving tank 5, and a stop valve 15 is installed in the middle of the vent pipe 17. 18 is a high-pressure air supply pipe, and a stop valve 14 is arranged in the middle of this high-pressure air supply pipe 18.

Next, the operation of the condensate extraction device of the negative pressure condenser constructed as described above will be explained. First, as shown in FIG. 2a, the stop valve 13 is opened, the stop valves 14 and 15 are closed, and the vacuum pump 7 is operated to discharge the air in the condensate receiving tank 5. At this time, the check valves 6 and 9 are closed. If the condensate tank 5 is sufficiently exhausted and the internal pressure of the condensate tank 5 becomes the same as that of the negative pressure condenser 7, then
As shown, the condensate 1 pushes open the check valve 6 and falls into the condensate receiving tank 5. When the stop valve 13 is closed to stop the vacuum pump 7 and the stop valve 15 is opened, the negative pressure condenser 2 and the condensate receiving tank 5 become at the same pressure, and the condensate 1 is continuously supplied to the condensate receiving tank. 5
The prime mover (vacuum pump 7) can be stopped until the condensate falls into the container and the condensate receiving tank 5 becomes full, thereby saving energy. When the condensate tank 5 becomes full, the vacuum pump 7 is kept stopped and the stop valve 14 is opened as shown in Figure c to supply high pressure air to the condensate tank 5 and drain the liquid. Forcibly discharge from 16. At this time, stop valve 1
3 and 15 are in the closed state. By repeating the above operations, the negative pressure condenser 2 can be drained.

FIG. 3 shows a second embodiment of the invention.

The condensate receiving tank 5 is equipped with the following items.

Liquid level notification adjustment device (L, C) This has a terminal 21 and a controller and is linked to the solenoid valve MV1. When there is no condensate 1, the opening direction of the solenoid valve MV1 is toward the vacuum pump 7, and when the liquid is full. It is set so that the high-pressure air flows out.

Pressure micro-contact switch sw The contact is set in advance to the operating pressure of the negative pressure condenser 7, and the switch is energized when that pressure (degree of vacuum) is reached. Also this is a solenoid valve MV
2. Linked to MV3.

Check valves 6, 9, 10 These valves open and close naturally due to pressure changes to prevent backflow. The check valves 6 and 9 are installed horizontally, as shown in FIG. 4, so that liquid is always accumulated and no air leaks in even if the inflow becomes negative pressure. The check valve 10 is installed to prevent air from flowing back into the condensate receiving tank 5 even if the vacuum pump 7 is stopped.

Solenoid valves MV1, MV2, MV3 The solenoid valve MV1 is a three-way valve, and operates as described above in conjunction with the liquid level notification adjustment device (L, C). The solenoid valves MV2 and MV3 are linked to the pressure micro-contact switch sw, and when the pressure micro-contact switch sw is turned on, the solenoid valve MV2 opens, and the solenoid valve
MV3 is set to close.

7 is a vacuum pump 7. Various types of vacuum pump 7 are conceivable, but the volume of condensate in general operation is sufficiently small compared to the volume of the negative pressure condenser body, so the capacity of condensate receiving tank 5 is small. It's done. Therefore, a small capacity pump is sufficient;
In addition, a water jet pump is used which has the advantage that the degree of vacuum achieved can be changed depending on the temperature of the driving water.
Further, stopping the driving water has the same effect as turning off the switch of the pump 7, and can save labor.

Next, the operation of this second embodiment will be explained.

It is now assumed that there is no liquid in the condensate receiving tank 5. First, when the electrical system is energized, the liquid level notification and adjustment device (L, C) detects that there is no liquid, as shown in Figure 3a, and opens the solenoid valve MV1 to communicate with the vacuum pump 7, closing the high-pressure air gate. do. At the same time, the pressure micro contact switch sw has just started in the condensate receiving tank 5 and the contact is off.
The solenoid valve MV2 is closed and the solenoid valve MV3 is opened, and the vacuum pump 7 is operated to exhaust the air in the condensate receiving tank 5 and reduce the pressure.

Next, when the negative pressure condenser 7 and the condensate receiving tank 5 reach the same pressure, the condensed liquid 1 falls and flows into the condensate receiving tank 5, as shown in FIG. If the contact point of the pressure micro-contact switch sw is set to this pressure, the pressure micro-contact switch sw is turned on, solenoid valve MV2 is opened, and solenoid valve MV3 is closed. Therefore, since the negative pressure condenser 7 and the condensate receiving tank 5 are communicated with each other through the ventilation pipe 17 passing through the solenoid valve MV2, there is no problem with the inflow of liquid. Also, the vacuum pump 7 is stopped.

Next, as shown in FIG.
The opening direction of No. 1 is the high pressure air side. Therefore, the air is introduced into the condensate receiving tank 5 and its pressure increases. Therefore, the pressure micro-contact switch SW is turned off, the solenoid valve MV2 is closed (the solenoid valve MV3 is opened, and the vacuum pump 7 is in a preliminary operation state), and the liquid is drained by high-pressure air.

Next, as shown in Figure d, when the liquid in the condensed liquid receiving tank 5 is drained,
When the detection terminal 21 under C) detects that there is no liquid, the opening direction of the solenoid valve MV1 is set to the vacuum pump 7 side to stop the high-pressure air, and the vacuum pump 7, which is in preliminary operation in the previous operation, opens the condensate receiving tank. 5. Start exhausting.

Then, repeat the above operation to drain the liquid.

In addition, in the above-mentioned negative pressure condenser condensate removal device, there is a time when the draining operation is temporarily stopped, but if multiple condensate removal devices are arranged so that the draining operation is shifted, the draining operation can be continuously performed. A large amount of condensate 1 can be treated.

(Effects) As described above, the present invention leads out the discharge pipe from the reservoir of the negative pressure condenser where condensate accumulates, arranges the condensate receiving tank below the reservoir of the negative pressure condenser, and drains the condensate. The outlet end of the pipe is opened into the condensate receiving tank, and a check valve is provided in the middle of the discharge pipe to allow the condensate to flow toward the condensate receiving tank, while the suction pipe led out from the vacuum pump is connected to the condensate receiving tank. Since the opening has been made into the tank, if the condensate receiving tank is drained using a vacuum pump and the pressure inside the negative pressure condenser and the inside of the condensate receiving tank are the same, the condensate accumulated in the negative pressure condenser will be reversed. The stop valve can be pushed open to allow the condensate to fall naturally into the receiving tank, and therefore the condensate can be taken out efficiently without the need for a power mechanism in the condensate removal path. Since there are no direct rotating parts or sliding parts in the discharge path, it is possible to easily select the material of the power mechanism part and to make the structure more flexible. In addition, since the vacuum pump only needs to exhaust the inside of the tank, it has the effect of reducing the capacity.

In addition, since a discharge means is provided to discharge the condensate accumulated in the condensate receiving tank using air pressure, the condensate can flow into the condensate receiving tank and be discharged from the condensed liquid receiving tank only through air. Therefore, there is an effect that heat conduction to the condensate can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of the present invention, Fig. 2 a, b, and c are explanations of the operation of the first embodiment of the condensate extraction device of the present invention, and Fig. 3 a, b, c, and d are the same as the second embodiment of the same. FIG. 4, which is an explanatory diagram of the operation of the embodiment, is an enlarged sectional view of the same check valve as above. 1... Condensate, 2... Negative pressure condenser, 3... Reservoir, 4... Discharge pipe, 5... Condensate receiving tank, 6...
Check valve, 7...vacuum pump, 8...suction pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A discharge pipe is led out from the reservoir of the negative pressure condenser where condensate accumulates, and a condensate receiving tank is disposed below the reservoir of the negative pressure condenser, and The outlet end of the pipe is opened into the condensate receiving tank, and a check valve is provided in the middle of the discharge pipe to allow the condensate to flow toward the condensate receiving tank, while the suction pipe led out from the vacuum pump is connected to the condensate receiving tank. A condensate extraction device for a negative pressure condenser that opens into the tank. (2) Scope of Utility Model Registration The condensate removal device for a negative pressure condenser as set forth in claim 1, which is provided with a discharge means for discharging the condensate accumulated in the condensate receiving tank using air pressure. (3) Utility model registration In the condensate extraction device for a negative pressure condenser as described in claim 1, the introduction and exhausting of condensate into the condensate receiving tank is performed by discharging and introducing air in the condensed liquid receiving tank. What is done by