JP4738939B2 - 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.

  In the conventional liquid pumping device, a float and a snap mechanism are arranged in a sealed container provided with a working fluid introduction port, a working fluid discharge port, a liquid inflow port and a liquid discharge port, and the snap mechanism operates according to the raising and lowering of the float. In the liquid pumping device that pumps the liquid accumulated in the sealed container from the liquid discharge port by switching between opening and closing of the working fluid introduction port and the working fluid discharge port, the snap mechanism is a first supported by the sealed container. , A float arm and a secondary arm that rotate about the first axis, a second shaft supported by the float arm, a third shaft supported by the secondary arm, a second and a third And a spring disposed between the shafts, and the secondary arm is snap-rotated by the movement of the second shaft to switch between opening and closing of the working fluid introduction port and the working fluid discharge port.

In the conventional liquid pumping device, the third shaft connecting the sub arm and the spring is easily damaged, and therefore it is impossible to switch between the working fluid inlet and the working fluid outlet in a relatively short time. was there. This is because the rotational force of the sub arm acts on the third axis.
Japanese Patent No. 2754094

  The problem to be solved is to provide a liquid pressure feeding device capable of switching between opening and closing of a working fluid introduction port and a working fluid discharge port over a long period of time.

In the present invention, a float and a snap mechanism are arranged in a sealed container provided with a working fluid introduction port, a working fluid discharge port, a liquid inflow port, and a liquid discharge port, and operate by operating the snap mechanism according to the raising and lowering of the float. In the liquid pumping device for pumping the liquid accumulated in the sealed container by switching between opening and closing of the fluid introduction port and the working fluid discharge port, the snap mechanism includes a first shaft supported in the sealed container, A float arm and a first roller that rotate about the first axis, a second axis supported by the float arm, and a third axis provided between the first and second axes, A second roller that rotates about a third axis; and a spring disposed between the second axis and the second roller, the second roller with respect to the first roller by the spring. It is pressed in contact, the movement of the second shaft A second roller to snap movement, characterized in that for switching the opening and closing of the working fluid inlet port and the working fluid discharge port.

  According to the present invention, the snap mechanism is configured by using the first and second rollers, so that the liquid can be reliably pumped by switching the opening and closing of the working fluid introduction port and the working fluid discharge port over a long period of time. Produce.

  The liquid pumping device according to the present invention, as in the prior art, operates the snap mechanism in accordance with the raising and lowering of the float to switch between opening and closing of the working fluid introduction port and the working fluid discharge port. Pump from the outlet. That is, the float arm rotates around the first axis in accordance with the raising and lowering of the float. In conjunction with the rotation of the float arm, the second shaft approaches the extension of the line connecting the first roller and the second roller, and compresses and deforms the spring. When the second shaft exceeds the extension of the line connecting the first roller and the second roller, the spring suddenly recovers from deformation, and the second roller moves the first roller and the second shaft. It snaps to the opposite side of the initial line with respect to the connecting line and switches between opening and closing of the working fluid inlet and the working fluid outlet. As described above, since the snap mechanism is configured using the first and second rollers, the rotational force of the first roller does not act on the third shaft on which the second roller rotates. Therefore, it is possible to switch between opening and closing of the working fluid introduction port and the working fluid discharge port over a long period of time.

  An embodiment showing a specific example of the above technical means will be described. FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. FIG. 2 is an AA enlarged sectional view of FIG. FIG. 3 is an enlarged cross-sectional view of the snap mechanism portion of FIG. In FIG. 1, a 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.

  As shown in an enlarged view in FIG. 2, 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, a valve body 23, and an elevating 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 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 tip of the valve case 22 of the air supply valve 20 is screwed into the working fluid inlet 11. The valve body 23 is spherical and is on the working fluid inlet 11 side, and is opened and closed when the upper end of the elevating rod 24 abuts. The elevating rod 24 passes through the through hole of the valve case 22 to the closed container 2 side, and is connected to the connecting plate 28 at the lower end via the connecting shaft 27. The exhaust valve 21 includes a valve case 29, a valve body 30, and an elevating rod 31. The valve case 29 has a through-hole in the axial direction, and a valve seat 32 is provided inside the through-hole. Is what you do. The lower end of the elevating bar 31 is connected to the connecting plate 28 via the connecting shaft 27. 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 first 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 first roller 51, a second roller 52, and a coil spring 54. The float arm 34 is composed of two plates facing each other in parallel. The float 3 is fixed to the left end, and the right end is rotatably supported by the first shaft 35 described above. Accordingly, the float 3 swings up and down around the first shaft 35. A first roller 51 is rotatably supported on the first shaft 35.

  A second shaft 55 parallel to the first shaft 35 is stretched around the left end portion of the float arm 34. The float arm 34 is provided with a long hole 57 in the vertical direction between the first shaft 35 and the second shaft 55 close to the first shaft 35, and a first hole 35 parallel to the first shaft 35 is disposed in the long hole 57. The third shaft 58 is suspended, and the second roller 52 is rotatably supported on the third shaft 58. Between the second shaft 55 and the second roller 52, a compressed coil spring 54 that is compressed or stretched is disposed. The second roller 52 is pressed between the coil spring 54 and the first roller 51. Further, a fourth shaft 62 parallel to the first shaft 35 is stretched over the bracket 36, and the first arm 63 is rotatably supported on the fourth shaft 62. A first connecting shaft 64 that is parallel to the first shaft 35 is attached to the right end of the first arm 63 so that the lower end of the connecting plate 28 is connected to the first connecting shaft 64. A second connecting shaft 65 parallel to the first shaft 35 is attached to the left end of the first arm 63 so as to pass therethrough, and the upper end of the second arm 66 is connected to the second connecting shaft 65. The lower end of the second arm 66 is connected to the third shaft 58.

  Next, the operation of the liquid pumping apparatus 1 of this embodiment will be described by following a series of operation procedures when steam is used as the working fluid. First, in the external piping of the liquid pumping apparatus 1, the working fluid inlet 11 is connected to a high-pressure steam source, and the working fluid outlet 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, in the snap mechanism 5, the third shaft 58 is positioned above the line connecting the first shaft 35 and the second shaft 55. Therefore, the first connecting shaft 64 is lowered, the air 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 floats due to the condensate accumulated in the liquid reservoir space 10, the float arm 34 rotates clockwise about the first shaft 35, and the second shaft 55 is connected to the first roller 51 and the second roller 55. The coil spring 54 is compressed and deformed by approaching the extension of the line connecting the rollers 52. When the second shaft 55 exceeds the extension of the line connecting the first roller 51 and the second roller 52, the coil spring 54 suddenly recovers from the deformation, and the second roller 52 becomes the first roller 51. And the second shaft 55 are snapped downward on the opposite side of the initial line. As a result, the first connecting shaft 64 moves upward, the air supply valve 20 opens the working fluid introduction port 11, and the exhaust valve 21 closes the working fluid discharge port 13.

  When the working fluid inlet 11 is opened, high-pressure steam is introduced into the sealed container 2, the internal pressure rises, and the condensate accumulated in the liquid reservoir space 10 is pushed by the vapor pressure to be pumped liquid outlet. 17 is discharged 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 decreases due to the condensate discharge, the float 3 descends, the float arm 34 rotates counterclockwise about the first shaft 35, and the second shaft 55 moves to the second axis 55. The coil spring 54 is compressed and deformed by approaching the extension of the line connecting the first roller 51 and the second roller 52. When the second shaft 55 exceeds the extension of the line connecting the first roller 51 and the second roller 52, the coil spring 54 suddenly recovers from the deformation, and the second roller 52 becomes the first roller 51. And snaps upward with respect to the line connecting the second shaft 55 and the second shaft 55. As a result, the first connecting shaft 64 moves downward, the supply valve 20 closes the working fluid introduction port 11, and the exhaust valve 21 opens the working fluid discharge port 13.

Sectional drawing of the liquid pumping apparatus of the Example of this invention. The AA expanded sectional view of FIG. The expanded sectional view of the snap mechanism part of FIG.

Explanation of symbols

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 34 Float arm 35 1st Shaft 51 first roller 52 second roller 54 coil spring 55 second shaft 58 third shaft

Claims (1)

A float and a snap mechanism are arranged in a sealed container provided with a working fluid introduction port, a working fluid discharge port, a liquid inflow port and a liquid discharge port, and the snap mechanism is operated according to the raising and lowering of the float, and the working fluid introduction port and In the liquid pumping device that pumps the liquid accumulated in the closed container by switching the opening and closing of the working fluid discharge port, the snap mechanism includes a first shaft supported in the closed container, a first shaft A float arm and a first roller that rotate around the shaft, a second shaft supported by the float arm, a third shaft provided between the first and second shafts, and a third shaft A second roller rotating around the second shaft, and a spring disposed between the second shaft and the second roller, and the second roller is pressed against the first roller by the spring. cage, the second b by the movement of the second shaft Liquid pumping apparatus characterized by La by snap moving switch the opening and closing of the working fluid inlet port and the working fluid discharge port.

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