JP3341199B2 - Liquid pumping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping apparatus for pumping a liquid such as water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device for once collecting condensed water generated in a steam piping system and sending the condensed water to a boiler or a waste heat utilization device.

[0002]

2. Description of the Related Art Condensate generated by condensation in a steam piping system is:
It often still has a considerable amount of heat, so condensed water is collected using a liquid pumping device for effective use of energy, and this condensed water is sent to a boiler or waste heat utilization device to waste heat. Condensate recovery systems that make effective use of water are widely used.

[0003] A liquid pressure feeding device used in a condensate recovery system collects condensed water in a closed container once, introduces high-pressure working steam into the closed container, and uses the pressure of the working steam to make the inside of the closed container. Forcibly discharge condensate.

[0004] A conventional liquid pressure feeding device will be described below. FIG. 3 is a partial cross-sectional perspective view of a conventional liquid pumping device. FIG. 4 is an enlarged sectional view of an air supply valve and an exhaust valve portion of the conventional liquid pressure feeding device. 100 in the figure
Shows a prior art liquid pumping apparatus. Liquid pumping device 100
Float 120 and air supply valve 110 in closed container 101
Etc. are built-in.

[0005] The closed container 101 is provided with a pressure-feeding liquid inlet 102 and a pressure-feeding liquid outlet 103 near the bottom, and has check valves 105 and 106 respectively attached thereto. Here, the check valve 105 is mounted in a direction that allows the liquid to flow into the closed vessel 101. On the other hand, the check valve 106 is mounted in a direction that allows the liquid to be discharged from the sealed container 101 to the outside.

[0006] A working steam inlet 108 and a working steam outlet 109 are provided at the top of the closed vessel 101.
As shown in FIGS. 3 and 4, respectively, the intake valve 110 and the exhaust valve 111
Is attached. Here, both the supply valve 110 and the exhaust valve 111 open and close the valves by moving the lifting rods 112 and 113 up and down, but the supply valve 110 is opened when the lifting rod 112 is raised, Exhaust valve 1
11 is closed when the lifting bar 113 is raised. The lifting rods 112 and 113 are connected in parallel by a continuous plate 115, and the air supply valve 1 is moved by moving the continuous plate 115 up and down.
10. The exhaust valve 111 is simultaneously opened and closed.

In the prior art liquid pumping apparatus 100, a pumping liquid inlet 102 is connected to a vapor load via a check valve 105, and a pumping liquid outlet 103 is connected to a waste heat utilizing apparatus via a check valve 106. Connected. And the working steam inlet 10
8 is connected to a high pressure steam source. In the liquid pumping apparatus 100, when there is no condensate in the closed vessel 101, the float 1
Reference numeral 20 is at the lower position, and the continuous plate 115 is lowered.
Therefore, in the air supply valve 110, the lifting rod 112 is lowered,
A globe-shaped valve body 122 fixed to the tip of the lifting rod 112 blocks the opening of the valve seat 123. On the other hand, in the exhaust valve 111,
Disc-shaped valve element 12 attached to the tip of lifting rod 113
7 moves away from the opening of the valve seat 128 and the working steam outlet 10
9 is open.

When condensed water is generated within the steam load to which the liquid pumping device 100 is connected, the condensed water flows from the check valve 105 into the closed vessel 101 and accumulates. Then, as the amount of condensed water increases, the float 120 rises, and accordingly, one end of the arm 118 rises. And arm 1
When 18 exceeds a certain position, the snap mechanism 122 is inverted, the valve stem operating rod 121 moves upward, and the connecting plate 115 is lifted.

Then, in the air supply valve 110, the lifting rod 112 attached to the continuous plate 115 is raised, the valve body 122 is separated from the valve seat 123, and the working steam inlet 108 is opened. On the other hand, at this time, since the exhaust valve 111 is closed, the pressure in the sealed container 101 increases, and the condensate is discharged from the pressure-feed liquid discharge port 103 by being pushed by the pressure.

[0010]

The liquid pumping device of the prior art is preferable because the liquid can be forcibly recovered by the high pressure of the working steam. However, since condensed condensed water is mixed in the working steam, it takes time for the pressure in the closed vessel to rise to a predetermined value after the air supply valve is opened to pump the liquid, Has a problem that it takes time to pump the liquid, in other words, the liquid pumping ability per unit time is small.
In addition, the conventional liquid pumping apparatus has a problem in that the air supply valve is corroded by the above-mentioned condensate water, and a normal opening / closing valve operation cannot be performed in a relatively short time.

The present invention focuses on the above-mentioned problems of the prior art, and when the air supply valve is opened, the pressure in the closed container increases immediately, and the liquid in the closed container is pumped in a short time. In addition, an object of the present invention is to provide a liquid pressure feeding device in which the opening / closing operation of the air supply valve is reliably performed.

[0012]

Technical features of the present invention:
The closed container is provided with a working steam inlet, a working steam outlet, a pumping liquid inlet, and a pumping liquid outlet. The air supply valve and the working steam outlet for opening and closing the float and the working steam inlet are provided in the closed container. An exhaust valve that opens and closes is built in, and the air supply valve opens according to the level of the liquid stored in the sealed container, and discharges the liquid collected in the sealed container from the pressure-feeding liquid discharge port to the outside of the sealed container. The liquid pumping apparatus is characterized in that a steam trap for removing condensed water from the working steam inlet into the closed container is mounted in the closed container.

[0013]

In the liquid pumping apparatus of the present invention, a steam trap for removing condensed water from the working steam inlet into the closed container is provided in the closed container. Therefore, when the air supply valve is opened to pump the liquid, only steam is introduced from the working steam inlet into the closed container. Therefore, in the liquid pressure feeding device of the present invention, when the air supply valve is opened, the pressure in the closed container increases immediately. Similarly, in the liquid pumping apparatus of the present invention, the air supply valve does not corrode due to condensate.

[0014]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. FIG. 2 is an enlarged sectional view of the steam trap of FIG. In FIG. 1, a liquid pressure feeding device 1 of the present embodiment is shown.
In the figure, a float 3, a switching valve 4, a snap mechanism 5, and a steam trap 6 are arranged in a closed container 2.

To be described in order, the airtight container 2 has a lid 11 joined to a main body 10 in which a bottom plate 8 and a top plate 9 are welded to a side cylinder 7 by bolts, and a liquid storage space 12 is formed inside. is there. In this embodiment, the main body 10 of the closed container 2 is used.
A liquid feed inlet 13 and a liquid discharge outlet 14 are provided at the lower part of the space 11, and a working steam inlet 15 and a working steam outlet 16 are provided on the lid 11.

An air supply valve 20 is mounted inside the working steam inlet 15, that is, inside the sealed container 2, and an exhaust valve 21 is mounted inside the working steam outlet 16. Here, the air supply valve 20 is constituted by a valve case 22, a valve body 23, and a lifting rod 24. The valve case 22 has a through hole in the axial direction, and the upper end surface of the through hole functions as a valve seat 25. In the middle part of the valve case 22, there are provided four openings 26 for communicating the aforementioned through holes with the outside. The valve element 23 has a hemispherical shape, and is integrally attached to the tip of the lifting rod 24.

In the liquid pressure feeding device 1 of the present embodiment, the air supply valve 2
The leading end of the zero valve case 22 is screwed into the working steam inlet 11. And the valve body 23 is the working steam inlet 1
On one side, the lifting rod 24 passes through the through hole of the valve case 22 to the closed container 2 side, and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28. Further, the valve shaft operating rod 28 is connected to the snap mechanism 5.

The exhaust valve 21 includes a valve case 29, a valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction. A valve seat 32 is provided inside the through hole, and a valve body 30 held and fixed to the tip of an elevating rod 31 from below the valve seat 32 is brought into contact therewith. It opens and closes. Note that the valve shaft operating rod 28 and the elevating rod 31 are connected by a pin 33. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21. The exhaust valve 21 is closed when the air supply valve 20 is opened, and the exhaust valve 21 is opened when the air supply valve 20 is closed.

A steam trap 6 is mounted inside the working steam inlet 15 via a nipple 35. Here, as shown in FIG. 2, the steam trap 6 has a temperature controller inside a valve chamber 40 formed by an upper case 37 having an inlet 36 and a lower case 39 having an outlet 38. The element 41 is arranged. Temperature control element 41
Are upper and lower wall members 42 and 43 and upper and lower diaphragms 4
4 and 45 are welded to the outer peripheral edge of the upper wall member 42.
Expansion medium 46 is enclosed between the upper diaphragm 44 and
The valve member 47 is welded to the lower diaphragm 45. The expansion medium 46 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. And temperature control element 4
1 is urged downward by a spring 48 and is pressed by a step portion 51 of a housing cylinder 50 having a plurality of passage windows 49. The valve member 47 of the temperature control element 41 is separated from and seated on the lower valve seat 52 to open and close the outlet passage 53.

When the temperature of the valve chamber 40 decreases due to the return of the working steam, the steam trap 6 causes the expansion medium 46 to contract and the upper and lower diaphragms 44 and 45 to be separated from the valve seat 52 and to be led out. 53 is opened. As a result, the condensate is removed from the closed container 2. When the temperature in the valve chamber 40 rises due to the elimination of the condensate into the closed container 2, the expansion medium 46 expands and the upper and lower diaphragms 44 and 45 are seated on the valve seat 52 to close the outlet passage 53. This prevents leakage of steam.

The snap mechanism 5 has a float arm 51,
The auxiliary arm 52 includes a sub arm 52, a coil spring 53 in a compressed state, and spring receiving members 54 and 55.
Are supported by a bracket 57 via a swing shaft 56. The bracket 57 is integrally attached to the side cylinder 7 of the sealed container 2, and is connected with the shafts 58, 59, 60 and the swing shaft 56 as described above. Axis 5
Reference numerals 8 and 59 respectively serve as upper and lower stoppers of the float arm 51, and the shaft 60 also serves as a stopper of the sub arm 52.

The float arm 51 is composed of two opposing parallel members.
It consists of two plates. A shaft 61 is attached to the left ends of the two plates, and a connecting rod 62 welded to the float 3 is connected to the shaft 61. The right side of the float arm 51 is rotatably supported by the bracket 57 by the swing shaft 56 described above. Therefore, Float Arm 51
Follows the floating and sinking of the float 3 and swings up and down around the swinging shaft 56.

The right end of the float arm 51 projects downward, and the tip of the float arm 51 has a shaft 6 parallel to the swing shaft 56 described above.
3, and a spring receiving member 54 is rotatably supported on the shaft 63. The upper end of the sub arm 52 is rotatably supported by the swing shaft 56 described above. The sub arm 52 is composed of two plates facing each other in parallel, and each plate has a "T" shape. A shaft 64 parallel to the swing shaft 56 and the shaft 63 is wound around the lower end of the sub arm 52, and a spring receiving member 55 is rotatably supported on the shaft 64. A coil spring 53 in a compressed state is attached between the two spring receiving members 54 and 55.
A shaft 65 is wound around the upper right end of the sub arm 52, and the lower end of the valve shaft operating rod 28 is connected.

Next, the operation of the liquid pressure feeding device 1 of the present embodiment will be described by following a series of operation procedures. First, in the external piping of the liquid pressure feeding device 1, the working steam inlet 15 is connected to a high-pressure steam source, and the working steam outlet 16 is connected to a steam circulation pipe. Further, the pressure-feeding liquid inlet 13 is connected to a load such as a steam-using device via a check valve (not shown) that opens from the outside toward the liquid storage space 12. On the other hand, the pressure-feeding liquid discharge port 14 is connected to a liquid-pressure feeding destination such as a boiler via a check valve (not shown) that opens from the liquid storage space 12 to the outside.

The liquid storage space 1 of the liquid pressure feeding device 1 of the present embodiment.
If there is no condensate inside 2, the float 3 is located at the bottom as shown in FIG. At this time, the air supply valve 20 of the switching valve 4 is closed, and the exhaust valve 21 is open. Then, when condensed water is generated in a load such as a steam-using device, the condensed water flows down from the pumping liquid inlet 13 to the liquid pumping device 1 and accumulates in the liquid storage space 12. Here, the steam trap 6
When condensed water is generated from the working steam, the expansion medium 46 contracts, and the upper and lower diaphragms 44 and 45 are separated from the valve seat 52 to open the outlet passage 53, thereby discharging the condensed water into the closed container 2.
When the removal of the condensate into the closed container 2 is completed, the expansion medium 4
6 expands, and the upper and lower diaphragms 44 and 45 are seated on the valve seat 52 to close the lead-out passage 53, thereby preventing leakage of steam.

When the float 3 rises due to the condensed water collected in the liquid storage space 12, the float arm 51 rotates clockwise around the swing shaft 56, and at the connection with the coil spring 53. A certain shaft 63 moves to the left and approaches a line connecting the swing shaft 56 and the shaft 64, and the coil spring 53 is compressed and deformed. Then, the float 3 is further raised, and the shaft 63 is moved to the swing shaft 5.
When the float 3 rises and the shaft 63 moves to the left from the line connecting the swinging shaft 56 and the shaft 64, the coil spring 53 rapidly recovers its deformation. Then, the sub arm 52 rotates counterclockwise, and the shaft 64 snaps to the right. As a result, the valve shaft operating rod 28 connected to the shaft 65 of the sub arm 52 moves upward, and the air supply valve 20
Is opened and the exhaust valve 21 is closed.

When the air supply valve 20 is opened, only high-pressure steam is introduced into the closed vessel 2, the internal pressure increases, and the condensate collected in the liquid storage space 12 is pushed by the steam pressure. The liquid is discharged from the pumping liquid discharge port 14 to an external boiler or a waste heat utilization device via a check valve (not shown).

When the water level in the condensate storage space 12 drops as a result of discharging the condensate water, the float 3 descends. When the float 3 descends, the float arm 51 rotates counterclockwise about the swing shaft 56, and the shaft 63, which is a connection portion with the coil spring 53, moves rightward to swing the shaft. When approaching the line connecting the shaft 56 and the shaft 64, the coil spring 53 is compressed and deformed. Then, the float 3 is further lowered, and the shaft 63 is arranged on the line connecting the swing shaft 56 and the shaft 64. Still further, the float 3 is lowered and the shaft 63 is moved from the line connecting the swing shaft 56 and the shaft 64. Also move to the right,
The coil spring 53 rapidly recovers from the deformation, the sub arm 52 rotates clockwise, and the shaft 64 snaps to the left. As a result, the valve shaft operating rod 28 connected to the shaft 65 of the sub arm 52 moves downward, the air supply valve 20 closes, and the exhaust valve 21 opens.

In the above embodiment, a steam trap using an expansion medium has been described as an example. However, other types such as a steam trap using a bimetal and a float using a float can be used. It is also possible to use.

[0030]

According to the liquid pumping apparatus of the present invention, a steam trap for removing condensate from the working steam inlet to the closed container is provided in the closed container. Therefore, when the air supply valve is opened to pump the liquid, only the vapor is introduced into the closed container, and the pressure in the closed container increases immediately. Also, the intake valve does not corrode due to condensate. Therefore, the liquid pumping apparatus of the present invention has an excellent effect that the liquid in the closed container can be pumped in a short time, and the opening and closing operation of the air supply valve is reliably performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the steam trap of FIG.

FIG. 3 is a partial cross-sectional perspective view of a conventional liquid pumping device.

FIG. 4 is an enlarged sectional view of a supply valve and an exhaust valve of FIG. 3;

[Explanation of symbols]

 2 Sealed Vessel 3 Float 4 Switching Valve 5 Snap Mechanism 6 Steam Trap 11 Working Steam Inlet 13 Working Steam Outlet 16 Pumping Liquid Inlet 17 Pumping Liquid Outlet 20 Supply Valve 21 Exhaust Valve

Claims (1)

(57) [Claims] 1. A closed vessel is provided with a working steam inlet, a working steam outlet, a pumping liquid inlet, and a pumping liquid outlet,
An air supply valve that opens and closes the float and the working steam inlet and an exhaust valve that opens and closes the working steam outlet are built in the sealed container, and air is supplied according to the level of the liquid accumulated in the sealed container. In a liquid pumping device that opens the valve and discharges the liquid accumulated in the sealed container from the pumping liquid discharge port to the outside of the sealed container, a steam trap that eliminates condensate from the working steam inlet into the sealed container is provided in the sealed container. A liquid pumping device, which is attached to a liquid pump.