JP5411605B2 - Liquid pumping device - Google Patents

Description

The present invention relates to a liquid pumping device that pumps liquid such as hot water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device for sending condensate generated in various steam using devices to a boiler or a waste heat utilization site.

A conventional liquid pumping device is disclosed in Patent Document 1, for example. This is a closed container provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, a working valve inlet is provided with an air supply valve, and a working fluid outlet is provided with an exhaust valve. By switching the supply and exhaust valves according to the liquid level of the liquid accumulated in the closed container, the liquid is opened by opening the exhaust valve and closing the supply valve when the liquid level in the closed container is low. The liquid accumulated in the sealed container is pumped from the liquid outlet to the liquid pumping destination by closing the exhaust valve and opening the air supply valve when the liquid level in the sealed container is high. In this case, an electrode rod for detecting a change in liquid level is arranged in a sealed container, and a counter connected to the electrode rod for counting and displaying the number of on / off times of the electrode rod is provided.

US Patent No. 7004728

In the conventional liquid pumping device, an electrode rod for detecting a change in liquid level is arranged in a sealed container, and a counter connected to the electrode rod for counting and displaying the number of on / off of the electrode rod is provided. Thus, the number of pumping times of the liquid pumping device can be confirmed from the display value of the counter, and the life of the liquid pumping device can be estimated. However, since foreign matters such as dust and scale in the fluid adhere to the electrode rod, there is a problem that it is impossible to detect a change in the liquid level in the sealed container in a relatively short time. Further, in the case of using a pressure switch that detects a change in pressure in the sealed container, there is a problem that the pressure switch is turned on / off due to a minute pressure fluctuation in the sealed container.

Therefore, the problem to be solved by the present invention is to provide a liquid pumping device that can accurately check the number of pumping operations over a long period of time.

In order to solve the above-described problems, in the liquid pumping apparatus of the present invention, a working container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and an air supply valve is provided at the working fluid inlet. Provided from the exhaust valve at the working fluid discharge port, the liquid level in the sealed container is low by switching the supply valve and exhaust valve according to the height of the liquid level of the liquid accumulated in the sealed container Open the exhaust valve in the state and close the air supply valve to allow liquid to flow into the sealed container from the liquid inlet, and close the exhaust valve and open the air supply valve in the closed container when the liquid level in the closed container is high. A fluid switch is provided in the working fluid introduction pipe to which the working fluid introduction port is connected, and the number of times the flow switch is turned on / off is connected to the flow switch. Count and display In which characterized in that a number of devices.

According to the present invention, a flow switch is provided in a working fluid introduction pipe to which a working fluid introduction port is connected, and a counter that is connected to the flow switch and counts and displays the number of times the flow switch is turned on and off is provided. The flow switch ON / OFF count can be counted and displayed without being affected by foreign matter in the fluid and minute pressure fluctuations in the sealed container, and the pumping count can be accurately confirmed over a long period of time. This provides an excellent effect that the life of the liquid pumping apparatus can be reliably estimated.

It is sectional drawing of the liquid pumping apparatus concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The liquid pumping apparatus 1 according to the present embodiment has a float 3, a switching valve 4, and a snap mechanism 5 arranged in a sealed container 2. The sealed container 2 has a main body portion 7 and a lid portion 8 connected by screws (not shown), and a liquid reservoir space 10 is formed inside. The lid 8 is provided with a working fluid introduction port 11, a working fluid discharge port 13, a liquid inflow port 16, and a liquid discharge port 17. An air supply valve 20 is attached inside the working fluid introduction port 11, and an exhaust valve 21 is attached inside the working fluid discharge port 13. The air supply valve 20 includes a valve case 22, an air supply valve body 23, and an elevating rod 18. The valve case 22 has a through hole in the axial direction, and the upper end surface of the through hole functions as the valve seat 25. Four openings 26 are provided in the middle portion of the valve case 22 so as to communicate the above-described through holes with the outside. The air supply valve body 23 is spherical and is on the working fluid inlet 11 side, and a lifting rod 18 is integrally attached to the lower end thereof by welding. The lifting / lowering rod 18 passes through the through hole of the valve case 22 to the side of the sealed container 2 and comes into contact with the connecting plate 27. The connecting plate 27 is connected to a power transmission shaft 28, and the power transmission shaft 28 is connected to the snap mechanism 5. The exhaust valve 21 includes a valve case 29, an exhaust valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction, and has a valve seat 32 inside the through hole. The exhaust valve body 30 held and fixed to the upper end of the elevating rod 31 from below the valve seat 32 contacts and opens and closes. Is what you do. The lower end of the elevating rod 31 is connected to the valve shaft operating rod 28 by a pin. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21, and when the air supply valve 20 is opened, the exhaust valve 21 is closed, and when the air supply valve 20 is closed, the exhaust valve 21 is opened.

The float 3 is supported by a bracket 36 via a float arm 34 and a swing shaft 35. The bracket 36 is integrally attached to the lid portion 8 of the sealed container 2 by screws (not shown). The snap mechanism 5 includes a float arm 34, a sub arm 37, and a coil spring 38 in a compressed state. The float arm 34 is composed of two parallel opposing plates, the float 3 is fixed to the left end, and the right side portion is rotatably supported by the swing shaft 35. Accordingly, the float 3 swings up and down around the swing shaft 35. A first shaft 39 parallel to the swing shaft 35 is stretched around the center of the float arm 34. A first spring receiving member 40 is rotatably supported on the first shaft 39. A sub arm 37 is rotatably supported on the swing shaft 35. The sub arm 37 is composed of two plates facing each other in parallel, and a second shaft 41 parallel to the swing shaft 35 is stretched over the left end portion. A second spring receiving member 42 is rotatably supported on the second shaft 41. A coil spring 38 in a compressed state is disposed between the first and second spring receiving members 40 and 42. The float arm 34 is provided with a semicircular elongated hole 43, and a stopper shaft 44 parallel to the swing shaft 35 is supported by the bracket 36 in the elongated hole 43. The stopper shaft 44 regulates the rotation range of the sub arm 37. A connecting shaft 45 that is parallel to the swing shaft 35 is attached to the right end of the sub arm 37 so as to pass therethrough, and the lower end of the power transmission shaft 28 is connected to the connecting shaft 45. Stopper shafts 51 and 52 that are parallel to the swing shaft 35 and restrict the swing range of the float arm 34 are supported by the bracket 36. A flow switch 56 is provided in the working fluid introduction pipe 55 to which the working fluid introduction port 11 is connected, and a counter 57 that counts the number of times the flow switch 56 is turned on / off is connected to the flow switch 56.

Next, operation | movement of the liquid pumping apparatus 1 of a present Example is demonstrated by following a series of operation | movement procedures at the time of using vapor | steam as a working fluid. First, in the external piping of the liquid pumping apparatus 1, the working fluid introduction port 11 is connected to a high-pressure steam source via the working fluid introduction tube 55, and the working fluid discharge port 13 is connected to the steam circulation piping. The liquid inlet 16 is connected to a load such as a vapor using device via a check valve (not shown) that opens from the outside toward the liquid reservoir space 10, and the liquid outlet 17 is directed outward from the liquid reservoir space 10. It is connected to a liquid pumping destination such as a boiler via an open check valve (not shown). When there is no condensate in the liquid reservoir space 10 of the liquid pumping apparatus 1 of this embodiment, the float 3 is located at the bottom as shown in FIG. At this time, the supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. When condensate is generated in a load such as a steam using device, the condensate flows down from the pumping liquid inlet 16 to the liquid pumping device 1 and accumulates in the liquid reservoir space 10. When the float 3 rises due to the condensate accumulated in the liquid reservoir space 10, the float arm 34 rotates clockwise about the swing shaft 35, and the first shaft 39, which is a connecting portion with the coil spring 38, moves upward. To the extension line of the line connecting the swing shaft 35 and the second shaft 41, the coil spring 38 is compressed and deformed. When the float 3 further floats and the first shaft 39 exceeds the extension of the line connecting the oscillating shaft 35 and the second shaft 41, the coil spring 38 suddenly recovers from deformation and the sub arm 37 is counterclockwise. The connecting shaft 45 is snapped upward by rotating in the turning direction. As a result, the power transmission shaft 28 connected to the connection shaft 45 snaps upward, and the air supply valve 20 is opened and the exhaust valve 21 is closed.

When the air supply valve 20 is opened and the working fluid introduction port 11 is opened, high-pressure steam is introduced into the sealed container 2 through the working fluid introduction pipe 55, and the internal pressure rises and accumulates in the liquid reservoir space 10. The condensate is pushed by the vapor pressure and discharged from the pressurized liquid discharge port 17 to an external boiler or waste heat utilization device via a check valve (not shown). When the water level in the condensate reservoir space 10 is lowered due to the discharge of the condensate, the float 3 descends, and the float arm 34 rotates counterclockwise about the swing shaft 35, which is a connecting portion with the coil spring 38. The first shaft 39 moves downward and approaches an extended line connecting the swing shaft 35 and the second shaft 41, and the coil spring 38 is compressed and deformed. When the float 3 further descends and the first shaft 39 exceeds the extension of the line connecting the swing shaft 35 and the second shaft 41, the coil spring 38 suddenly recovers from deformation and the sub arm 37 rotates clockwise. The connecting shaft 45 snaps downward by rotating in the direction. As a result, the power transmission shaft 28 coupled to the coupling shaft 45 snaps downward, closing the air supply valve 20 and opening the exhaust valve 21. The flow switch 56 is turned on when the air supply valve 20 is opened, the working fluid introduction port 11 is opened, and high-pressure steam is introduced into the sealed container 2 through the working fluid introduction pipe 55, and the air supply valve 20 is closed. When the working fluid introduction port 11 is closed and high-pressure steam is not introduced into the sealed container 2 through the working fluid introduction pipe 55, the operation state is turned off. The number of times the flow switch 56 is turned on / off is counted and displayed by the counter 57, and the life of the liquid pumping apparatus 1 is estimated by confirming the number of pumping times of the liquid pumping apparatus 1 from the display value of the counter 57. .

  The present invention is not limited to a condensate pressure feeding device that sends condensate generated in various steam using devices to a boiler or a waste heat utilization place, but can also be used in a liquid pressure feeding device that pumps liquid such as hot water or fuel.

DESCRIPTION OF SYMBOLS 1 Liquid pumping apparatus 2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 10 Liquid storage space 11 Working fluid inlet 13 Working fluid outlet 16 Liquid inlet 17 Liquid outlet 20 Air supply valve 21 Exhaust valve 55 Working fluid introduction pipe 56 Flow switch 57 counter

Claims (1)

The sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working fluid inlet, and an exhaust valve is provided at the working fluid outlet. Depending on the liquid level of the liquid accumulated in the tank, the air supply valve and the exhaust valve are switched between open and closed, and the liquid flow is achieved by opening the exhaust valve and closing the air supply valve when the liquid level in the sealed container is low. By flowing into the sealed container from the inlet and closing the exhaust valve and opening the air supply valve when the liquid level in the sealed container is high , the working fluid is introduced into the sealed container from the working fluid inlet pipe to which the working fluid inlet is connected. In the case where the liquid accumulated in the sealed container is pumped from the liquid discharge port to the liquid pressure destination, it is turned on / off depending on whether the working fluid is introduced into the sealed container from the working fluid introduction pipe. Operate the flow switch to turn off Provided in the body inlet, a liquid pumping device, characterized in that a counter that displays counts the number of on-off of the flow switch is connected to the flow switch.

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