JP2000002200A - Pressure feed device for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensate pressure feed device which can take away a condensate at the inlet port for working steam into a sealed vessel using a low-cost structure. SOLUTION: A sealed vessel 2 is provided with a working steam inlet port 15, steam exhaust port 16, pressure feed liquid inlet port 13 and liquid exhaust port 14, and incorporates a float 3, a supply valve 20 to open and close the steam inlet port, and an exhaust valve 21 to open and close the steam exhaust port, wherein the supply valve opens in accordance with the level of the liquid stagnating in the vessel, and the stagnating liquid is exhausted to outside the vessel from the exhaust port. In this liquid pressure feed device, a thermo- responsive element 25 to make displacement in accordance with the temp. change is coupled with the supply valve so as to take away the condensate at the inlet port into the vessel.

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.

A conventional liquid pressure feeding device is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-247378. This is because a closed vessel is provided with a working steam inlet, a working steam outlet, a pumping liquid inlet and a pumping liquid outlet, and an air supply valve for opening and closing the float and working steam inlet in the closed vessel. An exhaust valve that opens and closes the discharge port is built in, and the air supply valve opens according to the level of the liquid collected in the sealed container, and the liquid stored in the sealed container is pumped out of the sealed container through the liquid discharge port. In this liquid pumping apparatus, a steam trap for removing condensed water from a working steam inlet into a closed container is provided in the closed container.

[0005] In the prior art liquid pumping apparatus, the condensate of the working steam inlet is removed into the closed vessel by the steam trap. Therefore, when the air supply valve is opened to pump the condensate, only the steam is introduced. It is introduced into the closed container through the mouth. Therefore, the pressure in the closed container is quickly increased, and condensate in the closed container can be pumped in a short time.
Since condensed water does not stay at the working steam inlet, corrosion of the air supply valve can be prevented.

[0006]

However, in the above-mentioned conventional apparatus, a separate steam trap is required to remove the condensate from the working steam inlet into the closed vessel.
It was expensive and left room for improvement.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a condensate pumping device which can eliminate condensate from a working steam inlet into a closed vessel with an inexpensive structure.

[0008]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to provide a closed vessel with a working steam inlet, a working steam outlet, a pumping liquid inlet and a pumping liquid drain. An outlet is provided, and 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 the height of the liquid level of the liquid collected in the sealed container The air supply valve opens in response to the pressure, and in the liquid pumping device that discharges the liquid accumulated in the sealed container from the liquid discharge port to the outside of the sealed container, a temperature responsive element that is displaced according to temperature change is connected to the air supply valve The condensate of the working steam inlet is excluded from the closed vessel.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a liquid pressure feeding device according to the present invention, an air supply valve is opened according to the level of the liquid stored in a closed container,
The liquid accumulated in the closed container is discharged from the pressure-feeding liquid discharge port to the outside of the closed container. Also, when the temperature of the working steam inlet decreases due to the occurrence of condensate, the temperature responsive element opens the air supply valve,
Eliminate the condensate from the working steam inlet in a closed container. Therefore, when the air supply valve is opened to pump condensate, only steam is introduced from the working steam inlet into the closed container, and condensate in the closed container can be pumped in a short time. Also,
Corrosion of the air supply valve can be prevented.

Since the liquid pressure feeding device of the present invention has a temperature responsive element connected to the air supply valve, a case, a valve, a valve seat and the like for forming a steam trap as in the prior art are required. do not do. Therefore, the condensed water at the working steam inlet can be eliminated in the closed vessel with an inexpensive structure.

[0011]

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. 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, and a snap mechanism 5 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 and an exhaust valve 21 is provided inside the working steam outlet 16.
Is attached. The air supply valve 20 includes a valve seat 22, a valve body 23, and a lifting rod 24. The valve element 23 is
It is located on the working steam inlet 15 side and is integrally attached to the tip of a lifting rod 24. The lifting rod 24 passes through the through hole of the valve seat 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.

A temperature responsive element 25 is mounted on the valve body 23 of the air supply valve 20.
Is fixed. The temperature responsive element 25 is a substantially disk-shaped closed body capsule (not shown) filled with a thin film diaphragm and a thermal expansion / contraction liquid. The thermal expansion and contraction liquid is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. The temperature responsive element 25 is suspended by a spring 26.

When the temperature of the working steam inlet 15 decreases due to the condensed working steam and the temperature of the working steam inlet 15 decreases, the thermal expansion and contraction liquid contracts and the valve body 23 is separated from the valve seat 22 via the thin film diaphragm. Let me know. As a result, the condensate is removed from the closed container 2. When the temperature of the working steam inlet 15 rises due to the elimination of the condensate into the closed vessel 2, the thermal expansion / contraction liquid expands, and the valve body 23 is moved to the valve seat 2 via the diaphragm.
2 to prevent leakage of steam.

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 inside the through hole, and a valve body 30 held and fixed from below the valve seat 32 to the tip of an elevating rod 31. It opens and closes. Valve shaft operating rod 28
The lifting rod 31 is connected to the lifting rod 31 by a pin 33. Air supply valve 2
0 and the exhaust valve 21 constitute the switching valve 4.

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 protrudes downward, and the front end thereof 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 pumping 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 valve shaft operating rod 28 is lowered, the valve element 23 of the air supply valve 20 in the switching valve 4 is closed, and the valve element 30 of 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, when condensate is generated at the working steam inlet 15 and the temperature is lowered, the temperature responsive element 25 separates the valve body 23 from the valve seat 22 via the thin film diaphragm due to the contraction of the thermal expansion / contraction liquid. Let me sit down. As a result, the condensate is removed from the closed container 2. When the temperature of the working steam inlet 15 rises due to the elimination of the condensate into the closed container 2, the thermally expanded and contracted liquid expands, and the valve 23 is moved through the diaphragm to the valve seat 2.
2 to prevent leakage of steam.

When the float 3 floats due to the condensed water collected in the liquid storage space 12, the float arm 51 rotates clockwise about 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 decreases as a result of pumping 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-described embodiment, an example using a thermal expansion / contraction liquid as the temperature responsive element has been described. However, a bimetal, a shape memory alloy, or the like may be used.

[0027]

According to the present invention, a temperature-responsive element for removing condensate from the working steam inlet to the closed vessel is connected to the air supply valve. Therefore, it does not require a case, a valve, or a valve seat for forming a steam trap unlike the prior art, so that it is possible to eliminate condensate at the working steam inlet into the closed vessel with an inexpensive structure. Has an excellent effect.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Closed container 3 Float 4 Switching valve 5 Snap mechanism 11 Working steam introduction port 13 Working steam discharge port 16 Pumping liquid inflow port 17 Pumping liquid discharge port 20 Supply valve 21 Exhaust valve 25 Temperature-responsive element

Claims (1)

[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 temperature-responsive element that changes according to temperature change is connected to the air supply valve, and the working steam is introduced. A liquid pumping device characterized in that condensate in a mouth is excluded in a closed container.