JPH09280489A - Liquid forced feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid forced feeding device capable of overhauled without stopping the operation on the loading side. SOLUTION: An operating fluid introducing port 11, an operation fluid discharging port 13, a forced feeding liquid inflow port 16, and a forced feeding liquid discharging port 17 are provided on a sealed container 2. A float 3 and an air supplying/discharging valve 4 are housed in the sealed container. An inflow side check valve 6 and a three-way selector valve 10 are attached to an inflow pipe 12 to which the forced feeding liquid inflow port 16 is to be connected, and a system outside eliminating pipe 14 is branched from the three- way selector valve 10. A discharging side check valve 9 is attached to a discharging pipe 15 to which the forced feeding liquid discharging port 17 is to be connected. When a liquid forced feeding device 1 is overhauled, the three-way valve 10 shuts off the sealed container 2 side and is switched in the position for communicating the loading side with the system outside eliminating pipe 14 side.

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 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.

A liquid pumping device used in a condensate recovery system temporarily stores condensate in a closed container, and then switches the opening and closing of a supply / exhaust valve to introduce a high-pressure working fluid such as steam into the closed container. The pressure of the working fluid forcibly discharges the condensate in the closed container.

A conventional liquid pressure-feeding device will be described below. FIG. 2 is a partial cross-sectional perspective view of a conventional liquid pumping device. In FIG. 3, reference numeral 100 designates a conventional liquid pumping device. The liquid pressure-feeding device 100 has a closed container 101 in which a float 120, an air supply / exhaust valve 130, a snap mechanism 140, etc. are built.

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 condensate to flow into the closed vessel 101. On the other hand, the check valve 106 is installed in a direction that allows the pressure-feeding of the condensed water from the closed container 101 to the outside.

A working fluid inlet 108 and a working fluid outlet 109 are provided at the top of the closed vessel 101.
An air supply / exhaust valve 130 including an air supply valve 110 and an exhaust valve 111 is attached. Here, the air supply valve 110 and the exhaust valve 111 both open and close by vertically moving the lifting rods 112 and 113.
10 is opened when the lifting rod 112 is raised, and the exhaust valve 11 is opened.
1 is closed when the lifting bar 113 is raised. The elevating rods 112 and 113 are connected in parallel by the connecting plate 115, and the intake valve 11 is moved by moving the connecting plate 115 up and down.
0, 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 fluid inlet 10
8 is connected to a high pressure fluid 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, the air supply valve 110 blocks the working fluid introduction port 108. On the other hand, the exhaust valve 111 opens the working fluid outlet 109.

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 140 reverses, the valve shaft operating rod 121 moves upward, and the connecting plate 115 is lifted.

Then, the air supply valve 110 is connected to the working fluid inlet 10
Open 8. On the other hand, at this time, the exhaust valve 111 closes the working fluid discharge port 109, so that the pressure in the closed container 101 rises and is pressed by the pressure, and the condensate is pumped from the pumped liquid discharge port 103.

[0010]

The liquid pumping device of the prior art is capable of pumping liquid efficiently by switching the opening / closing of the supply / exhaust valve according to the height of the liquid level in the closed container. Is. However, in order to overhaul the liquid pumping device, it is necessary to stop the operation of the vapor load side, which causes a problem that productivity is reduced.

It is an object of the present invention to provide a liquid pressure feeding device which can be disassembled and inspected without stopping the operation on the load side, paying attention to the above-mentioned problems of the prior art.

[0012]

A feature of the present invention is that a closed container is provided with a working fluid introduction port, a working fluid discharge port, a pressure-feeding liquid inflow port, and a pressure-feeding liquid discharge port. It has a built-in air supply / exhaust valve that is connected to the float and that switches between opening and closing the working fluid inlet and working fluid outlet.The inlet check valve is attached to the inlet pipe connected to the pressure-feeding liquid inlet, and the inlet pipe is connected to the inlet pipe. In the liquid pumping apparatus, a three-way switching valve is attached, an external exclusion pipe is branched, and a discharge check valve is attached to a discharge pipe connected to a pumped liquid discharge port.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The liquid pumping device of the present invention is used by operating the switching valve body at a position where the branch pipe side is shut off and the closed container side is communicated with in normal times. Similar to that known in the past,
The liquid is pumped by switching the opening and closing of the supply / exhaust valve according to the height of the liquid level of the liquid accumulated in the closed container. That is, first, the working fluid discharge port is opened and the working fluid introduction port is closed to allow the liquid to flow into the closed container from the pressure-feeding liquid inflow port, then the working fluid discharge port is closed and the working fluid introduction port is opened to collect in the closed container. The liquid is pumped from the liquid feed port.

In the liquid pumping device of the present invention, a three-way switching valve is attached to the inflow pipe connected to the pumping liquid inflow port, and the external exclusion pipe is branched. Therefore, by switching the three-way switching valve to shut off the closed container side and connect the branch pipe side, the pumped liquid can be discharged outside the system without flowing into the closed container, so that the operation on the load side is not stopped. You can overhaul the liquid pumping device

[0015]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a partial cross-sectional configuration diagram of a liquid pumping apparatus according to a specific embodiment of the present invention. In FIG. 1, a liquid pumping device 1 according to the present embodiment is provided with a float 3, an air supply / exhaust valve 4 and a snap mechanism 5 in an airtight container 2, an inflow side check valve 6, a three-way switching valve 10 and a discharge side. The check valve 9 is connected.

Explaining in sequence, the closed container 2 has a main body 7
And the lid portion 8 are connected by screws (not shown), and a liquid storage space 10 is formed therein. In the present embodiment, the main body 7 of the closed container 2 is a mere container, and the characteristic components of the present embodiment are generally provided on the lid 8 of the closed container 2. That is, the lid 8 is provided with four openings, specifically, a working fluid inlet 11, a working fluid outlet 13, a pumping liquid inlet 16, and a pumping liquid outlet 17.

An air supply valve 20 is attached inside the working fluid inlet 11, in other words, a position inside the closed container 2, and an exhaust valve 21 is attached inside the working fluid outlet 13. 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 pumping apparatus 1 of this embodiment, the air supply valve 2
The tip of the 0 valve case 22 is screwed into the working fluid inlet 11. And the valve body 23 is the working fluid 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. The valve shaft operating rod 28 and the lifting rod 31 are connected by a pin 33. The air supply valve 20 and the exhaust valve 21 constitute the air supply / exhaust valve 4. When the air supply valve 20 opens, the exhaust valve 21 closes, and when the air supply valve 20 closes, the exhaust valve 21 opens.

The pressure-feeding liquid inlet 16 is located substantially in the center of the lid portion 8, and the pressure-feeding liquid outlet 17 is provided at a position corresponding to the lower portion of the closed container 2.

The float 3 is supported by a bracket 36 via a lever 34 and a shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a first shaft 37. The bracket 36 and the bracket 38 are joined by screws (not shown) and integrally attached to the lid portion 8 of the closed container 2. The lever 34 is made by bending a plate into a "U" shape, and two plates are opposed to each other in parallel. The float 3 is connected to the bent portion of the lever 34. A shaft 40 is attached to the other end of the lever 34.

When viewed from above, the bracket 36 is made up of two "L" -shaped plates, and the shafts 41, 42 and the shaft 35 described above are bridged and connected. The shaft 35 also serves as the swing shaft of the float 3. Float 3 has shaft 35
It swings up and down around. The shafts 41 and 42 also serve as upper and lower limit stoppers for the float 3. On the other hand, similarly, the bracket 38 is also made up of two "L" -shaped plates, and the shaft 43 and the above-mentioned first shaft 37 are bridged and connected. Axis 43 is the following sub arm 5
Also serves as a stopper for 2.

The snap mechanism 5 includes a floating arm 51,
The sub arm 52 includes a coil spring 54 in a compressed state, a spring receiving member 55, and a spring receiving member 56. The front arm 51 is composed of two plates facing each other in parallel,
A groove 57 is provided at the left end of the two plates. The right end of the float arm 51 is rotatably supported by the first shaft 37 described above. Also the front arm 51
The shaft 40 of the lever 34 described above is fitted in the groove 57. Therefore, the float arm 51 follows the ups and downs of the float 3 and swings up and down about the first shaft 37.

The right end of the float arm 51 expands downward, and the second shaft 58 parallel to the above-mentioned first shaft 37 is stretched over the lower end thereof, and the spring receiving member 55 is arranged at the first end. It is rotatably supported by two shafts 58. The upper end of the sub arm 52 is rotatably supported by the first shaft 37. The sub arm 52 is composed of two plates facing each other in parallel, and each plate has an inverted "L" shape. At the lower end of the sub arm 52, the first and second shafts 3 described above are provided.
A third shaft 59, which is parallel to 7, 58, is bridged, and the spring bearing member 56 is rotatably supported by the third shaft 59. The compressed coil spring 54 is attached between the spring receiving members 55 and 56. Further, a shaft 60 is wound around the upper left end of the sub arm 52, and the valve shaft operating rod 28
The lower ends of are connected.

The inflow pipe 1 to which the pumping liquid inlet 16 is connected
2, the check valve 6 on the inlet side and the three-way switching valve 10 are attached to
The external exclusion pipe 14 is branched from the three-way switching valve 10.
Here, the three-way switching valve 10 is the closed container 2 of the inflow check valve 6.
It may be attached to the side. A discharge side check valve 9 is attached to the discharge pipe 15 to which the pressure-feeding liquid discharge port 17 is connected. Here, the inflow side check valve 6 is attached in a direction that allows the inflow of condensed water into the closed container 2. On the other hand, the discharge-side check valve 9 is mounted in a direction that allows the condensate to be pumped out from the closed container 2.

Next, the operation of the liquid pressure-feeding device 1 of the present embodiment will be described by following a series of operation procedures when steam is used as the working fluid. First, in the external pipe of the liquid pumping device 1, the working fluid introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to the steam circulation pipe. Further, the inflow pipe 12 is connected to a load such as a steam-using device, and the discharge pipe 15 is connected to a liquid pressure destination such as a boiler. Then, the three-way switching valve 10 is switched to a position that shuts off the outside exclusion pipe 14 side and connects the load side and the closed container 2 side.

The liquid storage space 1 of the liquid pumping device 1 of this embodiment
If there is no condensate within 0, the float 3 is located at the bottom as shown in FIG. At this time, the air supply valve 20 in the air supply / exhaust valve 4 is closed and the exhaust valve 21 is opened. When condensate is generated in the load of the steam using device, etc., the condensate is pumped through the three-way switching valve 10 and the inflow check valve 6 to the pressure-feeding liquid inlet 1.
It flows down from 6 into the closed container 2 and collects in the liquid storage space 10.

When the float 3 floats up due to the condensed water stored in the liquid storage space 10, the lever 34 rotates in the clockwise direction around the shaft 35, and the rotation of the lever 34 causes the shaft 40 to rotate.
Float arm 51 is linked to the downward movement of the
Rotates in the counterclockwise direction around the shaft 37, and the second shaft 58, which is the connecting portion with the coil spring 54, moves to the right to approach the line connecting the first shaft 37 and the third shaft 59. The coil spring 54 is compressed and deformed. Then, the float 3 further rises, the second shaft 58 is lined up on the line connecting the first shaft 37 and the third shaft 59, and the float 3 still rises and the second shaft 58 rises.
Is moved to the right of the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers its deformation, and the sub arm 52 rotates clockwise to rotate the third shaft. 59 snaps to the left. As a result, the axis 60 of the sub arm 52
The valve shaft operation rod 28 connected to the
0 is opened and the exhaust valve 21 is closed.

When the working fluid introducing port 11 is opened, high-pressure steam is introduced into the closed container 2 to increase the internal pressure,
The condensed water stored in the liquid storage space 10 is pushed by the vapor pressure and discharged from the pumping liquid discharge port 17 to the external boiler or the waste heat utilization device via the discharge side check valve 9.

As a result of discharging the condensate, the water level in the condensate reservoir space 10 is lowered and the float 3 is lowered. Then Lever 3
4 rotates counterclockwise around the shaft 35, and the lever 3
The float arm 51 rotates clockwise around the first shaft 37 in conjunction with the upward movement of the shaft 40 due to the rotation of the second shaft 4 and the second shaft which is a connecting portion with the coil spring 54. 58
Moves to the left to approach the line connecting the first shaft 37 and the third shaft 59, and the coil spring 54 is compressed and deformed. Then, the float 3 is further lowered, the second shaft 58 is aligned on the line connecting the first shaft 37 and the third shaft 59, and the float 3 is still lowered and the second shaft 58 is moved to the first shaft 58. When it moves to the left of the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers its deformation and the sub arm 52 rotates counterclockwise to rotate the third shaft 59. Snaps to the right. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves downward, the air supply valve 20 closes, and the exhaust valve 21 opens.

When the liquid pumping device 1 is disassembled and inspected, the three-way switching valve 10 shuts off the closed container 2 side and switches the load side and the outside system exclusion pipe 14 side to a communicating position. Condensate generated in the load of the steam using device or the like is removed from the system through the system exclusion pipe 14 without flowing down to the closed container 2.

[0032]

In the liquid pressure-feeding device of the present invention, the three-way switching valve is attached to the inflow pipe to which the pressure-feeding liquid inflow port is connected to branch the outside system exclusion pipe. Therefore, by switching the three-way switching valve, there is an excellent effect that overhauling can be performed without stopping the operation on the load side.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional configuration diagram of a liquid pumping device according to a specific embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of a conventional liquid pumping device.

[Explanation of symbols]

 2 Airtight container 3 Float 4 Air supply / exhaust valve 5 Snap mechanism 6 Inflow side check valve 9 Discharge side check valve 10 Three-way switching valve 11 Working fluid introduction port 12 Inflow pipe 13 Working fluid discharge port 14 Outside system exhaust pipe 15 Discharge Pipe 16 Pumped liquid inlet 17 Pumped liquid outlet

Claims (1)

[Claims] 1. A closed vessel is provided with a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet,
An air supply / exhaust valve that is connected to the float and that switches between opening and closing the working fluid inlet and working fluid outlet is built in the closed container, and the inlet side check is connected to the inlet pipe connected to the pressure-feeding liquid inlet. The liquid is characterized in that a valve is attached, a three-way switching valve is attached to the inflow pipe to branch the external exclusion pipe, and a discharge-side check valve is attached to the discharge pipe connected to the pressure-feed liquid discharge port. Pumping device.