JP2013040662A - Liquid pumping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce biting of foreign matters in a fluid between a first and second spring bearings and a coil spring.SOLUTION: A float 3, change-over valve 4, and snap mechanism 5 are built into a sealed vessel 2. The snap mechanism 5 has: a swing shaft 35 supported in the sealed vessel 2; a float arm 34 and auxiliary arm 37 rotating around the swing shaft 35; a first shaft 39 supported by the float arm 34; a second shaft 41 supported by the auxiliary arm 37; the first spring bearing 40 rotating around the first shaft 39; the second spring bearing 42 rotating around the second shaft 41; and the coil spring 38 installed between the first and second spring bearings 40 and 42. The coil spring 38 is installed in a tube portion 48 continuing between the first and second spring bearings 40 and 42. One end of the coil spring 38 is coupled to the spring bearing sliding into the tube portion 48. The tube portion 48 is integrally provided with the second spring bearing 42.

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 sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and a float, a switching valve and a snap mechanism are built in the sealed container. A supported swing shaft, a float arm and a sub arm rotating around the swing shaft, a first shaft supported by the float arm, a second shaft supported by the sub arm, and a first shaft A first spring receiver that rotates about an axis; a second spring receiver that rotates about a second axis; and a coil spring that is attached between the first and second spring receivers, It is connected to the float arm, and the switching valve is connected to the sub arm via the valve shaft operating rod. The liquid pumping device disclosed in Patent Document 1 has a problem in that the coil springs are bent and deformed or buckled because the axes of the first and second spring receivers are displaced in the process of floating and lowering the float. A technique for solving this problem is disclosed in Patent Document 2, for example. In this configuration, a coil spring is mounted on a continuous shaft core between the first and second spring bearings, and one end of the coil spring is coupled to a spring bearing that slides on the shaft core.

US Pat. No. 5,141,405 JP-A-7-035296

The liquid pumping device disclosed in Patent Document 2 can prevent the coil spring from being bent and prevent deformation and buckling by the continuous axial core between the first and second spring receivers. There is a problem that foreign matter in a fluid such as dust and scale is easily caught between the receiver and the coil spring, and the smoothness of the operation is lacking.

Therefore, the problem to be solved by the present invention is to provide a liquid pumping device in which foreign matter in a fluid such as dust or scale is not easily caught between the first and second spring receivers and the coil spring.

In order to solve the above problems, the liquid pumping apparatus of the present invention is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet in a sealed container, and a float, a switching valve, and A snap mechanism is incorporated, and the snap mechanism includes a swing shaft supported in the sealed container, a float arm and a sub arm rotating around the swing shaft, a first shaft supported by the float arm, and a sub shaft. A second shaft supported by the arm; a first spring receiver that rotates about the first axis; a second spring receiver that rotates about the second axis; and first and second springs A coil spring mounted between the receiver, the float is connected to the float arm, and the switching valve is connected to the sub arm via the valve shaft operating rod, and the coil spring is between the first and second spring receivers The car One end of the spring is coupled to receive a spring to slide cylindrical portion, and is characterized in that the cylindrical portion is provided on one integral with receiving the first and second springs.

According to the present invention, the coil spring is housed in the continuous cylindrical portion between the first and second spring receivers, one end of the coil spring is coupled to the spring receiver that slides on the cylindrical portion, and the cylindrical portion is the first and second cylindrical portions. Since it is provided integrally with one of the spring receivers, it is possible to prevent the coil spring from being bent and to prevent deformation and buckling by the cylindrical portion, and to prevent foreign matter in the fluid between the first and second spring receivers and the coil spring. There is an effect that it is difficult to bite.

It is sectional drawing of the liquid pumping apparatus concerning embodiment of this invention. It is an expanded sectional view of the coil spring part of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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 24. The valve case 22 has a through hole in the axial direction, and an air supply valve port 25 is formed in the upper part of the through hole. Four openings 26 are provided in the peripheral wall of the intermediate portion of the valve case 22 to communicate the air supply valve port 25 and the inner side of the sealed container 2. The air supply valve body 23 has a spherical shape and is positioned on the working fluid introduction port 11 side of the air supply valve port 25, and a lifting rod 24 is integrally attached to the lower end thereof by welding. The lower part of the lifting / lowering rod 22 comes out to the inside of the sealed container 2 and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28, and the valve shaft operating rod 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 an exhaust valve port 32 at the upper part of the through hole. The exhaust valve body 30 held and fixed to the upper end of the lifting / lowering rod 31 from below the exhaust valve port 32 is seated. Open and close. 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 swing shaft 35, a sub arm 37, a coil spring 38, a first shaft 39, a first spring receiver 40, a second shaft 41, and a second spring receiver 42. 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 receiver 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 receiver 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 receivers 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 parallel to the swing shaft 35 is attached to the right end portion of the sub arm 37 so as to pass therethrough, and the lower end of the valve shaft operating rod 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. An inner periphery of a cylindrical portion 48 provided integrally with the second spring receiver 42 is fitted on the outer periphery of the first spring receiver 40 so as to be slidable in the axial direction of the coil spring 38, and the coil spring 38 is inserted into the cylindrical portion 48. Decorated. Therefore, the first spring receiver 40 at one end of the coil spring 38 slides in the axial direction of the cylindrical portion 48.

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, 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 valve shaft operating rod 28 connected to the connecting shaft 45 snaps upward, 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 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 And is discharged from the pressure 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 valve shaft operating rod 28 connected to the connecting shaft 45 snaps downward, closing the air supply valve 20 and opening the exhaust valve 21.

  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 reservoir space 11 Working fluid inlet 13 Working fluid outlet 16 Liquid inlet 17 Liquid outlet 18 Supply valve 19 Exhaust valve 28 Valve shaft operating rod 33 Coil spring 34 Float arm 35 Oscillating shaft 37 Sub arm 38 Coil spring 39 First shaft 40 First spring receiver 41 Second shaft 42 Second spring receiver 48 Tube portion

Claims (1)

The sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and a float, a switching valve and a snap mechanism are built in the sealed container, and the snap mechanism is supported in the sealed container. A swing shaft, a float arm and a sub arm rotating around the swing shaft, a first shaft supported by the float arm, a second shaft supported by the sub arm, and the first shaft A first spring receiver that rotates about the second axis, a second spring receiver that rotates about the second axis, and a coil spring that is attached between the first and second spring receivers, and the float is attached to the float arm. In the case where the switching valve is connected to the sub arm via the valve shaft operating rod, the coil spring is housed in a continuous cylindrical portion between the first and second spring receivers, and one end of the coil spring slides on the cylindrical portion. Coupled to the spring receiver Part liquid pumping apparatus, wherein a provided on one integral with receiving the first and second springs.

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