JP5312975B2 - 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 because the closed 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. An inlet check valve that allows only the flow of liquid to the sealed container is provided at the liquid inlet, and a pressure check valve that allows only the flow of fluid to the liquid pressure destination is provided at the liquid outlet, and is sealed. By operating a snap mechanism using a spring according to the raising and lowering of the float arranged in the container and moving the power transmission shaft by snapping, the supply valve and the exhaust valve are switched between opening and closing via the power transmission shaft, First, the exhaust valve is opened and the air supply valve is closed to allow the liquid to flow into the sealed container via the inflow side check valve, and then the liquid accumulated in the sealed container is closed by closing the exhaust valve and opening the air supply valve. Pumped to liquid destination via pressure check valve Is shall.

JP-A-8-145290

  In order to ensure switching between opening and closing of the supply valve and the exhaust valve, the conventional liquid pumping device needs to use a strong spring for the snap mechanism, and supports the spring receiver and the spring receiver that support the spring. There was a problem that the shaft was worn or damaged in a relatively short time.

  Therefore, the problem to be solved by the present invention is to provide a liquid pumping device that can reliably switch between opening and closing of the air supply valve and the exhaust valve without using a strong spring in the snap mechanism.

  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, an exhaust valve is provided at the working fluid discharge port, an inflow check valve that allows only the flow of liquid to the sealed container is provided at the liquid inlet, and the flow of fluid to the liquid pressure destination is provided at the liquid discharge port. The pressure transmission side check valve that allows only the power transmission shaft is provided, and the power transmission shaft is moved by snapping the power transmission shaft by operating a snap mechanism using a spring according to the raising and lowering of the float arranged in the sealed container. The air supply valve and the exhaust valve are switched between opening and closing, and first the exhaust valve is opened and the air supply valve is closed to allow liquid to flow into the sealed container via the inflow side check valve, and then the exhaust valve is closed and supplied. Open the air valve to collect in the sealed container In a liquid pumping device that pumps liquid to a liquid pumping destination via a pressure-feed-side check valve, a lever that swings around a valve swinging shaft supported in a sealed container in response to a snap movement of the power transmission shaft is provided. An air supply valve body of the air supply valve is provided on one side of the lever, and an exhaust valve body of the exhaust valve is provided on the other side. The air supply valve of the lever is adapted to snap movement of the power transmission shaft. The force of snap movement of the power transmission shaft is expanded by the lever by switching between opening and closing of the supply valve and exhaust valve by the body and exhaust valve body, and transmitted to the supply valve body and exhaust valve body is there.

  According to the present invention, the lever that swings about the valve swing shaft supported in the hermetic container according to the snap movement of the power transmission shaft is rotatably supported by the power transmission shaft, and is supplied to one surface of the lever. The exhaust valve body of the exhaust valve is provided on the other side of the supply valve body of the air valve, and the supply valve and exhaust valve are opened and closed by the lever supply valve body and exhaust valve body according to the snap movement of the power transmission shaft. By switching, the force of snap movement of the power transmission shaft is expanded by the lever and transmitted to the air supply valve body and the exhaust valve body, and the force of snap movement of the power transmission shaft is expanded by the lever to Since it can be transmitted to the exhaust valve body, there is an effect that the opening / closing of the air supply valve and the exhaust valve can be reliably switched without using a strong spring in the snap mechanism.

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 provided inside the working fluid introduction port 11, and an exhaust valve 21 is provided inside the working fluid discharge port 13. The air supply valve 20 is constituted by an air supply valve body 22 and an air supply valve seat 23, and the exhaust valve 21 is formed by an exhaust valve body 24 and an exhaust valve seat 25. The air supply valve seat 23 is screwed to the inside of the working fluid introduction port 11, and the exhaust valve seat 25 is screwed to the inside of the working fluid discharge port 13. The air supply valve body 22 is integrally formed above the right end portion of the lever 27, and the exhaust valve body 24 is integrally formed below the right end portion of the lever 27. The intermediate portion of the lever 27 is supported by the lid portion 8 via the valve swing shaft 18 and swings up and down around the valve swing shaft 18. The left end of the lever 27 is rotatably supported by the power transmission shaft 28 via the fulcrum shaft 19, and the power transmission shaft 28 is connected to the snap mechanism 5. The distance between the valve swing shaft 18 and the supply valve body 22 of the intake valve 20 and the distance between the valve swing shaft 18 and the exhaust valve body 24 of the exhaust valve 21 are the valve swing shaft 18. And a distance shorter than the fulcrum shaft 19. 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.

  The operation of the liquid pumping apparatus 1 is as follows. First, in the external piping of the liquid pumping apparatus 1, the working fluid inlet 11 is connected to a high-pressure fluid source, and the working fluid outlet 13 is connected to the fluid circulation piping. The liquid inlet 16 is connected to a load such as a steam using device via an inflow check valve that opens from the outside toward the sealed container 2, and the liquid outlet 17 is a pressure-feed-side check that opens from the sealed container 2 to the outside. It is connected to a liquid pumping destination such as a boiler through a valve. 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. At this time, the supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. In addition, the inflow check valve is opened and the pressure check valve is closed. When condensate is generated in a load such as a steam using device, the condensate flows down from the liquid inlet 16 to the liquid pumping device 1 due to the water head pressure, 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, the lever 27 rotates clockwise about the valve swing shaft 18, the air supply valve 20 is opened, and the exhaust valve 21 is closed. When the air supply valve 20 is opened and the exhaust valve 21 is closed, the working fluid is introduced into the sealed container 2 from the working fluid introduction port 11, the internal pressure rises, the inflow check valve is closed, and the pumping side Check valve is opened. Condensate collected in the liquid storage space 10 is pushed by the fluid pressure and discharged from the liquid discharge port 17 to an external boiler or waste heat utilization device via the pressure-feed-side check valve. Since the force of snap movement of the power transmission shaft 28 is enlarged by the lever 27 and transmitted to the supply valve body 22 and the exhaust valve body 24, the supply valve 20 and the exhaust valve are not used without using a strong coil spring 38 for the snap mechanism. The switching of opening and closing 21 can be performed reliably.

  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 connected to the connection shaft 45 snaps downward, the lever 27 rotates counterclockwise about the valve swing shaft 18, and the air supply valve 20 is closed. The exhaust valve 21 is opened. When the air supply valve 20 is closed and the exhaust valve 21 is opened, the pressure-feed side check valve is closed and the inflow side check valve is opened.

  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 Airtight container 3 Float 4 Switching valve 5 Snap mechanism 10 Liquid reservoir space 11 Working fluid inlet 13 Working fluid outlet 16 Liquid inlet 17 Liquid outlet 18 Oscillating shaft 19 for valve 19 Support shaft 20 Air supply valve 21 Exhaust valve 22 Supply valve body 24 Exhaust valve body 27 Lever 28 Power transmission shaft

Claims (1)

The airtight container is 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, an exhaust valve is provided at the working fluid outlet, and a liquid inlet is provided. An inlet check valve that allows only the flow of liquid to the sealed container is provided, and a pressure check valve that allows only the flow of fluid to the liquid pressure destination is provided at the liquid discharge port. By operating a snap mechanism using a spring according to the raising and lowering of the arranged float and moving the power transmission shaft by snapping, the supply valve and exhaust valve are opened and closed via the power transmission shaft, and the exhaust gas is exhausted first. By opening the valve and closing the air supply valve, the liquid flows into the sealed container via the inflow side check valve, and then closing the exhaust valve and opening the air supply valve causes the liquid accumulated in the sealed container to reverse the pressure side. Liquid to be pumped to the liquid pumping destination through the stop valve In feeding device, a lever which swings around the valve rocker shaft supported in a sealed container in accordance with the snap movement of the power transmission shaft via the support shaft is rotatably supported to the power transmission shaft, the lever An air supply valve body of the air supply valve is provided on one side of the part opposite to the fulcrum shaft with the valve swing shaft in between, and an exhaust valve body of the exhaust valve is provided on the other side. By switching between opening and closing of the air supply valve and exhaust valve by the air supply valve body and exhaust valve body of the lever, the force of snap movement of the power transmission shaft is expanded by the lever and transmitted to the air supply valve body and exhaust valve body A liquid pumping device.

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