JPH08247387A - Liquid pressure-feeding device - Google Patents

Abstract

PURPOSE: To provide a liquid pressure-feeding device which can pressure-feed liquid in a closed container in a short time, and moreover surely carry out the opening and closing of an air feed valve. CONSTITUTION: In a liquid pressure-feeding device, a working steam introducing port 15, a working steam discharge port 16, a pressure-fed liquid flowing-in port 13 and a pressure-fed liquid discharge port 14 are provided in a closed container 2, and a float 3 and an air feed valve 20 for opening-closing the working steam introducing port and an exhaust valve 21 for opening-closing the working steam discharge port are built-in in the closed container, and the air feed valve is opened according to the height of the level of the liquid collected in the closed container to discharge the liquid collected in the closed container through the pressure-fed liquid discharge port outside the closed container, and a steam trap 6 for discharging a condensate at the working steam introducing port into the closed container is attached inside the closed container.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

A liquid pumping apparatus used in a condensate recovery system temporarily recovers condensate in a closed container, introduces high-pressure working steam into the closed container, and the pressure of the working steam causes the inside of the closed container to flow. This will forcefully discharge the condensate.

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

The closed container 101 is provided with a pressure-feeding liquid inflow port 102 and a pressure-feeding liquid discharge port 103 near the bottom, and check valves 105 and 106 are attached to the respective ports. Here, the check valve 105 is attached in a direction that allows the liquid to flow into the closed container 101. On the other hand, the check valve 106 is mounted in a direction that allows the liquid to be discharged from the closed container 101 to the outside.

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

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

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

Then, in the air supply valve 110, the elevating rod 112 attached to the connecting plate 115 rises, the valve body 122 separates from the valve seat 123, and the working steam inlet 108 is opened. On the other hand, at this time, the exhaust valve 111 is closed, so that the pressure in the closed container 101 rises and is pushed by the pressure to discharge the condensed water from the pressure-feeding liquid discharge port 103.

[0010]

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

The present invention pays attention to the above-mentioned problems of the prior art, and when the air supply valve is opened, the pressure in the hermetically-sealed container is rapidly increased, and the liquid in the hermetically-sealed container is pumped in a short time. In addition, it is an object of the present invention to provide a liquid pumping device in which the opening / closing valve operation of the air supply valve is reliably performed.

[0012]

The technical features of the present invention are as follows:
The closed container is provided with a working steam inlet, a working steam outlet, a pressure-feeding liquid inlet and a pressure-feeding liquid outlet, and an air supply valve and a working steam outlet for opening and closing the float and the working vapor inlet are provided in the closed container. A built-in exhaust valve that opens and closes, the air supply valve opens according to the height of the liquid level of the liquid accumulated in the closed container, and the liquid accumulated in the closed container is discharged from the pressure-feeding liquid discharge port to the outside of the closed container. In the liquid pressure-feeding device, a steam trap for removing condensate from the working vapor introducing port into the airtight container is mounted in the airtight container.

[0013]

In the liquid pumping apparatus of the present invention, the steam trap for removing the condensate from the working vapor introducing port is installed in the closed container. Therefore, when the air supply valve is opened to pump the liquid, only steam is introduced into the closed container from the working steam inlet. Therefore, in the liquid pressure-feeding device of the present invention, the pressure in the closed container immediately rises when the air supply valve opens. Similarly, in the liquid pumping device of the present invention, the air supply valve will 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 device 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 this embodiment
In the closed container 2, a float 3, a switching valve 4, a snap mechanism 5 and a steam trap 6 are arranged.

The closed container 2 has a main body 10 in which a bottom plate 8 and a top plate 9 are welded to a side cylinder 7 and a lid 11 is connected by a bolt to form a liquid storage space 12 therein. is there. In this embodiment, the main body 10 of the closed container 2
A pressure-feeding liquid inflow port 13 and a pressure-feeding liquid discharge port 14 are provided in the lower part of the, and a working vapor introducing port 15 and a working vapor discharge port 16 are provided in the lid 11.

An air supply valve 20 is attached inside the working steam inlet 15, in other words, a position inside the closed container 2, and an exhaust valve 21 is attached inside the working steam outlet 16. Here, the air supply valve 20 is composed of 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 portion of the valve case 22, there are provided four openings 26 that communicate the above-mentioned through hole with the outside. The valve element 23 has a hemispherical shape and is integrally attached to the tip of the elevating rod 24.

In the liquid pumping apparatus 1 of this embodiment, the air supply valve 2
The tip of the valve case 22 of 0 is screwed into the working steam inlet 11. The valve body 23 is the working steam inlet 1
On the first side, the elevating rod 24 passes through the through hole of the valve case 22 and comes out to the closed container 2 side so as to abut 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 is composed of 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 inside the through hole, and a valve body 30 held and fixed to the tip of the elevating rod 31 comes into contact with the valve seat 32 from below. It opens and closes. The valve shaft operating rod 28 and the lifting rod 31 are connected by a pin 33. The supply valve 20 and the exhaust valve 21 constitute the switching valve 4, and when the supply valve 20 opens, the exhaust valve 21 closes, and when the supply valve 20 closes, the exhaust valve 21 opens.

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

In the steam trap 6, when the working steam condenses and the temperature in the valve chamber 40 drops, the expansion medium 46 contracts and the upper and lower diaphragms 44 and 45 move away from the valve seat 52 to lead out. Open 53. 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 condensed water in the closed container 2, the expansion medium 46 expands, seats the upper and lower diaphragms 44 and 45 on the valve seat 52, and closes the outlet passage 53. This prevents steam from leaking.

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

The front arm 51 has two parallel arms facing each other.
It consists of one plate. 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 a bracket 57 by the swing shaft 56. Therefore, the front arm 51
Follows the ups and downs of the float 3 and swings up and down about the swing shaft 56.

The right end portion of the float arm 51 projects downward, and the tip end thereof has a shaft 6 parallel to the swing shaft 56.
3, the 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. 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 stretched around the lower end of the sub arm 52, and the spring receiving member 55 is rotatably supported by the shaft 64. A coil spring 53 in a compressed state is attached between the spring receiving members 54 and 55.
Further, a shaft 65 is stretched over 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 this embodiment will be described by following a series of operation procedures. First, in the external pipe of the liquid pumping device 1, the working steam inlet 15 is connected to a high-pressure steam source, and the working steam outlet 16 is connected to the steam circulation pipe. 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-feed liquid discharge port 14 is connected to a liquid pressure destination such as a boiler via a check valve (not shown) that opens from the liquid storage space 12 toward the outside.

Liquid reservoir space 1 of liquid pumping device 1 of this embodiment
When there is no condensate in 2, the float 3 is located at the bottom as shown in FIG. At this time, the air supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. When condensate is generated in the load of the steam using device or the like, the condensate flows down from the pressure-feeding liquid inflow port 13 to the liquid pressure-feeding device 1 and accumulates in the liquid storage space 12. Here, the steam trap 6 is
When the condensate is generated from the working steam, the expansion medium 46 contracts, the upper and lower diaphragms 44 and 45 are separated from the valve seat 52, and the lead-out passage 53 is opened, so that the condensate is removed into the closed container 2.
When the removal of condensed water into the closed container 2 is completed, the expansion medium 4
6 expands to seat the upper and lower diaphragms 44 and 45 on the valve seat 52 and close the outlet passage 53 to prevent steam from leaking.

When the float 3 floats up due to the condensed water accumulated in the liquid storage space 12, the float arm 51 rotates clockwise around the swing shaft 56, and at the connecting portion with the coil spring 53. A certain shaft 63 moves to the left and approaches the line connecting the swing shaft 56 and the shaft 64, and the coil spring 53 is compressed and deformed. Then, the float 3 further rises, and the shaft 63 becomes the swing shaft 5.
6 and the shaft 64 are lined up, and when the float 3 moves up and the shaft 63 moves to the left of the line connecting the swing shaft 56 and the shaft 64, the coil spring 53 recovers its deformation rapidly. , 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 container 2, the internal pressure rises, and the condensed water in the liquid storage space 12 is pushed by the steam pressure. The liquid is discharged from the pressure-feeding 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 decreases as a result of discharging the condensate, the float 3 descends. When the float 3 descends, the float arm 51 rotates counterclockwise around the swing shaft 56, and the shaft 63, which is a connecting portion with the coil spring 53, moves to the right to swing the swing shaft. When approaching the line connecting 56 and the shaft 64, the coil spring 53 is compressed and deformed. Then, the float 3 further descends, and the shaft 63 is lined up on the line connecting the swing shaft 56 and the shaft 64. Still, the float 3 descends and the shaft 63 extends from the line connecting the swing shaft 56 and the shaft 64. Also moves to the right,
The coil spring 53 rapidly recovers its 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.

Although the steam trap using the expansion medium has been exemplified in the above embodiment, other types such as those using a bimetal or a float may be used. It is also possible to use.

[0030]

In the liquid pressure-feeding device of the present invention, the steam trap for removing the condensate at the working vapor introducing port into the closed container is installed 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 rapidly rises. Moreover, the air supply valve is not corroded by the condensate. Therefore, the liquid pressure-feeding device of the present invention has an excellent effect that the liquid in the closed container can be pressure-fed within a short time, and in addition, the opening / closing valve operation of the air supply valve is surely performed.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid pumping device 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 perspective view, partly in section, of a conventional liquid pressure-feeding device.

FIG. 4 is an enlarged cross-sectional view of an air supply valve and an exhaust valve portion of FIG.

[Explanation of symbols]

 2 Airtight container 3 Float 4 Switching valve 5 Snap mechanism 6 Steam trap 11 Working steam inlet 13 Working steam outlet 16 Pressure liquid inlet 17 Pressure liquid outlet 20 Air supply valve 21 Exhaust valve

Claims (1)

[Claims] 1. A closed container is provided with a working vapor inlet, a working vapor outlet, a pressure-feeding liquid inlet and a pressure-feeding liquid outlet,
The airtight valve that opens and closes the float and working steam inlet and the exhaust valve that opens and closes the working steam outlet are built into the closed container, and air is supplied according to the height of the liquid level of the liquid accumulated in the closed container. In the liquid pumping device that opens the valve and discharges the liquid accumulated in the closed container from the liquid discharge port to the outside of the closed container, the steam trap that eliminates the condensate of the working steam inlet into the closed container A liquid pumping device, characterized in that it is attached to.