JP4387474B2 - Liquid pumping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid pumping device that pumps liquid such as water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device that once collects the condensate generated in the steam piping system and sends this condensate to a boiler or a waste heat utilization device.
[0002]
[Prior art]
Condensate generated by condensing in the steam piping system still often has a considerable amount of heat. Therefore, for effective use of energy, the condensate is recovered using a liquid pumping device. A condensate recovery system that effectively uses waste heat by sending it to boilers and waste heat utilization devices is widely used.
[0003]
The liquid pumping device used in the condensate recovery system once recovers the condensate into the sealed container, and further switches the switching valve to introduce a high-pressure working fluid such as steam into the sealed container. Forcibly discharges the condensate in the sealed container. Therefore, in order to operate the liquid pumping apparatus with high efficiency, it is necessary to store as much condensate as possible in the sealed container and to switch the switching valve reliably.
[0004]
Therefore, in the liquid pressure feeding device, a snap mechanism using a coil spring is generally employed to ensure the switching of the switching valve. An example of a liquid pumping device incorporating a snap mechanism using a coil spring is disclosed in Japanese Patent Application Laid-Open No. 8-145290.
[0005]
FIG. 3 is a front view of a snap mechanism of a conventional liquid pumping device. In the liquid pumping device disclosed in the above-mentioned Japanese Patent Laid-Open No. 8-145290, the snap mechanism 100 is constituted by a float arm 101, a main arm 102, a sub arm 103, and a coil spring 104 in a compressed state. The
[0006]
The float arm 101 is fixed to a support member 105 so as to be swingable by a shaft 106. A float 107 is attached to the left end of the float arm 101, and a shaft 108 is attached to the right end.
[0007]
The main arm 102 is fixed so that the right end of the main arm 102 can swing with respect to the support member 105 by a shaft 109. One end of a coil spring 104 is coupled to a portion extending downward from the right end portion of the main arm 102 by a shaft 111 via a spring receiving member 110, and a long hole 112 is formed at the left end to form a float arm 101. The shaft 108 is fitted. The long hole 112 is formed in parallel to a line connecting the shaft 108 and the shaft 109.
[0008]
The sub-arm 103 has the same shaft 109 as the main arm 102 and has an upper end coupled to the support member 105. The other end of the coil spring 104 is coupled to the lower end of the sub-arm 103 by a shaft 114 via a spring receiving member 113, and a valve shaft operating rod 116 is coupled to a portion extending leftward from the upper end by a shaft 115. Yes. The valve shaft operating rod 116 is connected to a switching valve (not shown), and the snap mechanism 100 is linked to the switching valve via the valve shaft operating rod 116.
[0009]
In the prior art liquid pumping device, the float 107 floats when condensate accumulates in a closed container (not shown), and the float arm 101 moves around the shaft 106 in conjunction with the floating of the float 107. Rotate clockwise. In conjunction with the rotation of the float arm 101, the shaft 108 moves downward about the shaft 106 while sliding in the long hole 112 of the main arm 102, and the main arm 102 is centered on the shaft 109. Rotate counterclockwise. Due to the rotation of the main arm 102, the shaft 111, which is a connecting portion with the coil spring 104, moves to the right and approaches the line connecting the shaft 109 and the shaft 114, and the coil spring 104 is compressed and deformed. When the shaft 111 is aligned on the line connecting the shaft 109 and the shaft 114 and further moved to the right side of the line connecting the shaft 109 and the shaft 114, the coil spring 104 rapidly recovers from the deformation, and the sub-arm 103 rotates clockwise about the shaft 109, and the connecting portion (the shaft 114) between the coil spring 104 and the sub-arm 103 snaps to the left. As a result, the valve shaft operating rod 116 connected to the sub-arm 103 moves upward, and a switching valve (not shown) is rapidly switched.
[0010]
According to the prior art, when the float 107 floats at a certain height from the bottom, the rate of increase of the rotation angle of the float arm 101 with respect to the rising height per unit of the float 107 gradually decreases. And gradually increases after the horizontal position is exceeded. Meanwhile, the long hole 112 flow - store - Sure coupled to the shaft 108 of the arm 101 - increase rate of the rotation angle of the arm 102, flow - store - contrary to the arm 101, gradually decreases after gradually increased Become. Then, the snap movement occurs after the increasing rate of the rotation angle of the main arm 102 gradually decreases.
[0011]
[Problems to be solved by the invention]
In the conventional liquid pumping apparatus, since the snap movement occurs after the rate of increase of the rotation angle of the main arm 102 gradually decreases, the rotation speed of the main arm 102 when the snap movement occurs is compared. It was slow. Therefore, there remains room for improvement from the viewpoint of smooth operation.
[0012]
The present invention pays attention to the above-mentioned problems of the prior art, and an object of the present invention is to provide a liquid pumping apparatus that can operate smoothly by increasing the rotation speed of the main arm when the snap movement occurs.
[0013]
[Means for Solving the Problems]
A feature of the present invention is that a float is built in a sealed container having a working fluid introduction port, a working fluid discharge port, a pumping liquid inlet and a pumping liquid discharge port, and is rotated by raising and lowering the float. -By rotating the main arm through the arm, the coil spring is deformed and the sub arm is snapped, and the switching valve of the working fluid introduction port and the working fluid discharge port is switched to be opened and closed, and collected in the sealed container. A liquid pumping device that pumps the liquid from the pumped liquid discharge port, where the float arm and the main arm are connected by a shaft fitted in a long hole. To form a slanted surface extending toward the rear end side in the long hole with which the shaft is in sliding contact, and after the shaft has moved the slanted surface of the long hole toward the rear end side, the slanted surface of the long hole is directed toward the front end side. The shaft moves on the inclined surface of the long hole toward the rear end side. Huang SURE - angle of rotation of the arm does not reach the snap movement angle, axis flow as it moves toward the distal side inclined surface of the elongated hole - main for increasing the height of the unit bets Atari A - arm The rate of increase of the rotation angle of the main arm becomes larger than when the shaft moves on the inclined surface of the long hole toward the rear end side, and the rotation angle of the main arm reaches the snap movement operation angle so that the snap movement occurs. In the liquid pumping device.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In the liquid pumping apparatus of the present invention, the float arm rotates in conjunction with the raising and lowering of the float, and the main arm rotates with the shaft slidingly contacting the elongated hole. The coil spring is deformed by the rotation of the main arm, and the snap movement of the sub arm occurs at a predetermined position. As a result, the opening and closing of the switching valve between the working fluid introduction port and the working fluid discharge port is suddenly switched, and the liquid accumulated in the sealed container is pumped from the pumping liquid discharge port.
[0015]
According to the present invention, when the float floats at a certain height from the float inactive state at the bottom, the float arm has a rotation angle with respect to the rising height per unit of the float . The rate of increase gradually decreases and gradually increases after the horizontal position is exceeded . On the other hand, the rate of increase in the rotation angle of the main arm, in which the long hole is connected to the shaft of the float arm, decreases when the shaft moves toward the rear end side of the inclined surface of the long hole. Becomes larger when the inclined surface of the long hole moves toward the tip side. If the rotation angle of the main arm is zero when the float is not in operation and the counterclockwise direction is positive, the rotation angle of the main arm is set to a predetermined positive value during the rise of the float. Snap movement occurs when a snap movement operating angle that is the angle of is reached. Then, after the shaft moves on the inclined surface of the long hole toward the rear end side, the inclined surface of the long hole moves toward the front end side, and the shaft moves on the inclined surface of the long hole toward the rear end side. when the sURE - angle of rotation of the arm does not reach the snap movement angle, axis flow as it moves toward the distal side inclined surface of the elongated hole - main for increasing the height of the unit bets Atari a - arm The increase rate of the rotation angle of the main arm becomes larger than that when the shaft moves on the inclined surface of the long hole toward the rear end side, and the rotation angle of the main arm reaches the snap movement operation angle, and the snap movement occurs. Therefore, the rotation speed of the main arm when the snap movement occurs is increased, and the operation becomes smooth.
[0016]
【Example】
Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the snap mechanism of FIG. In FIG. 1, a liquid pumping apparatus 1 according to this embodiment is configured such that a float 3, a switching valve 4, and a snap mechanism 5 are disposed in a sealed container 2.
[0017]
If it demonstrates sequentially, the airtight container 2 will couple | bond the main-body part 7 and the cover part 8 with the screw which is not shown in figure, and the liquid storage space 10 is formed in the inside. The lid portion 8 is provided with four openings, specifically, a working fluid inlet port 11, a working fluid outlet port 13, a pressurized liquid inlet port 16, and a pressurized liquid outlet port 17.
[0018]
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 to communicate the above-described through holes with the outside.
[0019]
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 hemispherical, is on the working fluid inlet 11 side, and is integrally attached to the tip of the lifting rod 24. The lifting / lowering rod 24 passes through the through hole of the valve case 22 and comes out to the sealed container 2 side so as to come 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.
[0020]
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, a valve seat 32 is provided inside the through hole, and a valve body 30 held and fixed to the tip of the elevating rod 31 from below the valve seat 32 abuts. Open and close. The valve shaft operating rod 28 and the elevating rod 31 are connected by a shaft 33. The switching valve 4 is constituted by the supply valve 20 and the exhaust valve 21, and the exhaust valve 21 is closed when the supply valve 20 is opened, and the exhaust valve 21 is opened when the supply valve 20 is closed.
[0021]
The pumping liquid inlet 16 is located substantially at the center of the lid portion 8, and the pumping liquid discharge port 17 is provided at a position corresponding to the lower part of the sealed container 2.
[0022]
The float 3 is supported by a bracket 36 via a float arm 34 and a shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a shaft 37. The bracket 36 and the bracket 38 are coupled by screws (not shown) and are integrally attached to the lid portion 8 of the sealed container 2. The float arm 34 is formed by bending a plate into a “U” shape, and the two plates face each other in parallel. The float 3 is joined to the bent part of the float arm 34. A shaft 40 is attached to the other end of the float arm 34.
[0023]
When viewed from above, the bracket 36 is composed of two “L” -shaped plates, and the shafts 35, 41, 42 are spanned and connected. The shaft 35 also serves as the rocking shaft of the float 3. The float 3 rotates up and down around the shaft 35. The shafts 41 and 42 also serve as upper and lower limit stoppers for the float 3, respectively. Similarly, the bracket 38 is made of two “L” -shaped plates, and the shafts 37 and 43 are spanned and connected. The shaft 43 also serves as a stopper for the sub arm 52 described below.
[0024]
The snap mechanism 5 includes a main arm 51, a sub arm 52, a coil spring 54 in a compressed state, a spring receiving member 55, and a spring receiving member 56. The main arm 51 is composed of two plates facing each other in parallel, and a long hole 57 is provided at the left end of the two plates. The long hole 57 is formed with an inclined surface 61 that expands toward the rear end side. The main arm 51 is rotatably supported by the shaft 37 at its right end. The shaft 40 of the float arm 34 is fitted in the long hole 57 of the main arm 51. Therefore, the main arm 51 follows up and down of the float 3 and rotates up and down around the shaft 37.
[0025]
The right end portion of the main arm 51 is expanded downward, and a shaft 58 parallel to the shaft 37 is stretched over the lower end portion thereof, and the spring receiving member 55 is rotatably supported by the shaft 58. An upper end portion of the sub arm 52 is rotatably supported on the shaft 37. The sub-arm 52 is composed of two plates opposed in parallel, each plate having an inverted “L” shape. A shaft 59 parallel to the shafts 37 and 58 is stretched around the lower end portion of the sub arm 52, and a spring receiving member 56 is rotatably supported by the shaft 59. A compressed coil spring 54 is attached between the spring receiving members 55 and 56. A shaft 60 is stretched over the upper left end of the sub-arm 52, and the lower end of the valve shaft operating rod 28 is connected. A window 62 is opened in the float arm 51 so as not to hinder the movement of the shaft 60.
[0026]
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 introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to the steam circulation piping. Further, the pressure 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. On the other hand, the pressure liquid discharge port 17 is connected to a liquid pressure destination such as a boiler through a check valve (not shown) that opens from the liquid reservoir space 10 to the outside.
[0027]
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 pumped liquid inlet 16 to the liquid pumped device 1 and accumulates in the liquid reservoir space 10.
[0028]
When the float 3 rises due to the condensate accumulated in the liquid reservoir space 10, the float arm 34 rotates around the shaft 35 in the clockwise direction. In conjunction with the rotation of the floor arm 34, the shaft 40 moves downward about the shaft 35 while sliding in the long hole 57 of the main arm 51, and the main arm 51 is centered on the shaft 37. Rotate counterclockwise. By the rotation of the main arm 51, the shaft 58, which is a connecting portion with the coil spring 54, moves to the right and approaches the line connecting the shafts 37 and 59, and the coil spring 54 is compressed and deformed. The rate of increase of the rotation angle of the main arm 51 with respect to the height of the float 3 per unit unit decreases when the shaft 40 moves along the inclined surface 61 of the long hole 57 toward the rear end side. When 40 moves the inclined surface 61 of the long hole 57 toward the front end side, it becomes larger. Then, in the process in which the shaft 40 is moving on the inclined surface 61 of the long hole 57 toward the distal end side, the shaft 58 is arranged on a line connecting the shaft 37 and the shaft 59, and the shaft 58 is a line connecting the shaft 37 and the shaft 59. Move to the right. Then, the coil spring 54 suddenly recovers from deformation, the sub arm 52 rotates clockwise, and the shaft 59 snaps to the left. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves upward, the air supply valve 20 is opened, and the exhaust valve 21 is closed.
[0029]
When the working fluid inlet 11 is opened, high-pressure steam is introduced into the hermetic 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 through a check valve (not shown).
[0030]
When the float 3 descends due to the discharge of condensate, the float arm 34 rotates about the shaft 35 in the counterclockwise direction. In conjunction with the rotation of the floor arm 34, the shaft 40 moves upward about the shaft 37 while sliding in the long hole 57 of the main arm 51, and the main arm 51 is centered on the shaft 35. Rotate clockwise. By the rotation of the main arm 51, the shaft 58, which is a connecting portion with the coil spring 54, moves to the left and approaches the line connecting the shafts 37 and 59, and the coil spring 54 is compressed and deformed. The rate of increase of the rotation angle of the main arm 51 with respect to the lowering height per unit of the float 3 becomes smaller when the shaft 40 moves on the inclined surface 61 of the long hole 57 toward the rear end side. When 40 moves the inclined surface 61 of the long hole 57 toward the front end side, it becomes larger. Then, in the process in which the shaft 40 is moving on the inclined surface 61 of the long hole 57 toward the distal end side, the shaft 58 is arranged on a line connecting the shaft 37 and the shaft 59, and the shaft 58 is a line connecting the shaft 37 and the shaft 59. Move to the left. Then, the coil spring 54 suddenly recovers from deformation, the sub-arm 52 rotates counterclockwise, and the 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 is closed, and the exhaust valve 21 is opened.
[0031]
In the above embodiment, the shaft 40 is attached to the float arm 34 and the long hole 57 is provided in the main arm 51. However, the shaft is attached to the main arm 51 and the long hole is provided in the float arm. It may be provided.
[0032]
【The invention's effect】
In the liquid pumping apparatus of the present invention, the float arm and the main arm are connected by the shaft fitted in the long hole, and the shaft is slidably contacted by the rotation of the float arm on the rear end side. An inclined surface that widens toward the tip is formed, and snap movement occurs in a process in which the shaft moves toward the tip side of the inclined surface of the long hole. Therefore, there is an excellent effect that the rotation speed of the main arm at the time of causing the snap movement is increased and the operation becomes smooth.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the snap mechanism of FIG.
FIG. 3 is a cross-sectional view of a snap mechanism in a conventional liquid pumping device.
[Explanation of symbols]
2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 11 Working fluid inlet 13 Working fluid outlet 16 Pressure liquid inlet 17 Pressure liquid outlet 20 Air supply valve 21 Exhaust valve 28 Valve shaft operating rod 34 Float floor Arm 40 Shaft 51 Main arm 52 Sub arm 54 Compressed coil spring 57 Long hole 61 Inclined surface

Claims (1)

A float is built in a sealed container having a working fluid introduction port, a working fluid discharge port, a pumping liquid inlet and a pumping liquid discharge port, and is mainly connected via a float arm rotated by raising and lowering the float. By rotating the arm, the coil spring is deformed to snap the sub arm, and the switching valve between the working fluid introduction port and the working fluid discharge port is switched to open and close the liquid accumulated in the sealed container. A liquid pumping device that pumps from the outlet, where the float arm and the main arm are connected by a shaft fitted in the long hole, and the shaft is in sliding contact with the rotation of the float arm. An inclined surface extending toward the rear end side is formed in the hole, and after the shaft moves along the inclined surface of the long hole toward the rear end side, the inclined surface of the long hole is moved toward the front end side. When moving the inclined surface of the long hole toward the rear end, Rolling angular does not reach the snap movement angle, axis flow as it moves toward the distal side inclined surface of the elongated hole - DOO unit main for increasing the height of the Atari A - increase rate of the rotation angle of the arm is The shaft becomes larger than when the shaft moves on the inclined surface of the long hole toward the rear end side, and the rotation angle of the main arm reaches the snap movement operation angle so that the snap movement occurs. Liquid pumping device.

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