JP3785222B2 - 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. For example, US Pat. No. 5,141,405 discloses a liquid pumping device that incorporates a snap mechanism using a coil spring.
[0005]
FIG. 4 is a front view of a snap mechanism of a conventional liquid pumping device. In the liquid pumping device disclosed in the above-mentioned US Pat. No. 5,141,405, the snap mechanism 100 is constituted by a float arm 101, a sub arm 102, and a coil spring 103 in a compressed state. The float arm 101 is fixed to the support member 105 so as to be swingable by a pin 106, and a float 108 is attached to the tip.
[0006]
The sub arm 102 is connected to the support member 105 at one end by the same pin 106 as the float arm 101, and the other end is connected to one end of the coil spring 103 by the pin 110 through the spring receiving member 116. A valve shaft operating rod 111 is connected to a middle portion of the sub arm 102 by a pin 107. The valve shaft operating rod 111 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 111.
[0007]
The other end of the coil spring 103 in FIG. 4 is connected to the float arm 101 by a pin 112 via a spring receiving member 115. In the conventional liquid pumping apparatus, when condensate accumulates in a sealed container (not shown), the float 108 floats, and the spring receiving member 115 side of the coil spring 103 moves upward in conjunction with the float 108 floating. The coil spring 103 is compressed and deformed. When the float 108 is further raised, the coil spring 103 and the secondary arm 102 are arranged in a straight line, and when the float 108 is further lifted and the angle of the coil spring 103 and the secondary arm 102 exceeds 180 degrees. The coil spring 103 rapidly recovers from deformation, and the connecting portion (pin 110) between the coil spring 103 and the sub arm 102 snaps downward. As a result, the valve shaft operating rod 111 connected to the sub-arm 102 moves downward, and a switching valve (not shown) is rapidly switched.
[0008]
[Problems to be solved by the invention]
In the liquid pressure feeding device of the prior art, the switching valve is opened and closed by snap-moving the sub arm, so that the switching of the valve is performed relatively reliably. However, there is a problem that a pin for rotatably connecting the spring receiving member is necessary, and the number of parts is large and the structure is complicated. In addition, since the resistance due to the frictional force of the pin is large, the smoothness of the operation is lacking, a large buoyancy is required to counter this large frictional resistance, and the outer shape must inevitably become large. there were.
[0009]
SUMMARY OF THE INVENTION The present invention provides a liquid pumping device that pays attention to the above-described problems of the prior art, simplifies the structure by reducing the number of components, and can switch the switching valve with smooth operation and small buoyancy. For the purpose.
[0010]
[Technical means for solving the problems]
A feature of the present invention is that a float, a switching valve, and a snap mechanism are incorporated in a sealed container having a working fluid introduction port, a working fluid discharge port, a pumping liquid inflow port, and a pumping liquid discharge port. A first shaft supported in the container; a float arm rotating about the first axis; and the first shaft supported in the hermetic container at a point away from the first shaft. A second axis parallel to the axis of the second axis, a secondary arm rotating around the second axis, a spring receiving portion formed on the float arm, and a spring formed on the secondary arm A receiving portion; a reversing leaf spring disposed between the spring receiving portions; and a restraining member that restrains the bending of the reversing leaf spring to cause the reversing leaf spring to be reversed. Liquid pressure feeding device connected to the arm and the switching valve connected to the sub-arm Located in.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the liquid pumping apparatus of the present invention, the sub-arm snaps in accordance with the movement of the float, and the switching valve is switched to pump the liquid accumulated in the sealed container in the same manner as conventionally known. That is, when the condensate accumulates in the sealed container, the float rises, and the float arm rotates around the first axis in conjunction with the rise of the float, so that the restraining member becomes the reverse plate. The spring is bent in an “S” shape and reversed. By reversing the reversing leaf spring, the sub-arm snaps and the switching valve is switched abruptly.
[0012]
The snap mechanism employed in the liquid pumping apparatus of the present invention is formed by forming a spring receiving portion on each of the float arm and the sub arm, and therefore requires a fulcrum portion for rotatably connecting the spring receiving member. And not. Therefore, the number of parts can be reduced and a simple structure can be achieved. Further, since there is no rotation fulcrum in the spring receiving portion, the operation is very smooth, and the switching valve can be switched with a strong force even when using a small buoyancy, that is, a small float.
[0013]
【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 a cross-sectional view taken along the line DD of FIG. FIG. 3 is an explanatory view of the reversing operation of the reversing leaf spring 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, a snap mechanism 5, and valve means 6 are arranged in a sealed container 2.
[0014]
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. In the present embodiment, the main body portion 7 of the sealed container 2 is a mere container, and the characteristic components of the present embodiment are generally provided in the lid portion 8 of the sealed container 2. That is, the lid portion 8 is provided with four openings, specifically, a working fluid introduction port 11, a working fluid discharge port 13, a pressure feed liquid inlet 16, and a pressure feed liquid discharge port 17.
[0015]
As shown in FIG. 2, an air supply valve 20 is attached to the inside of the working fluid introduction port 11, in other words, a position inside the sealed container 2, and an exhaust valve 21 is attached to the inside of the working fluid discharge port 13. Yes. Here, 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. The valve body 23 has a spherical shape and is lifted by the tip of the lifting rod 24.
[0016]
The tip of the valve case 22 of the air supply valve 20 is screwed into the working fluid introduction port 11. The valve body 23 is on the working fluid introduction port 11 side, and the lifting / lowering rod 24 passes through the through hole of the valve case 22 to the sealed container 2 side, and the following sub-alarm of the snap mechanism 5 is connected via the shaft 47. Is connected to the main body 42.
[0017]
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. A valve body 30 held and fixed to the tip of the elevating rod 31 from below the valve seat 32 is in contact therewith. Open and close. The elevating bar 31 is connected to the sub arm 42 of the snap mechanism 5 through the shaft 47 described above. 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.
[0018]
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.
[0019]
The float 3 is supported by a bracket 36 via a float arm 34 and a first shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a second shaft 37. The brackets 36 and 38 are integrally attached to the lid portion 8 of the sealed container 2 by screws (not shown). The bracket 36 is made up of two parallelly facing plates on the front side and the opposite side of the paper surface, and the shafts 39 and 40 and the first shaft 35 are spanned and connected. The shafts 39 and 40 also serve as upper and lower limit stoppers for the float 3, respectively. On the other hand, the bracket 38 is also made of two plates facing in parallel on the front side and the opposite side of the paper surface, and the shaft 41 and the second shaft 37 are spanned and connected. The shaft 41 also serves as a stopper for the sub-arm 42 described below.
[0020]
The snap mechanism 5 includes a float arm 34, a secondary arm 42, and a reversing leaf spring 43. The left side of the float arm 34 is connected to the float 3, the right side is rotatably supported by the first shaft 35 described above, and swings up and down around the first shaft 35. Further, a spring receiving portion 44 protruding upward in a “V” shape is formed on the right side portion of the float arm 34, and the left piece and the right piece of the “V” shape portion constitute a restraining member 45.
[0021]
The sub-arm 42 is rotatably supported on the second shaft 37 described above. The sub-arm 42 has a spring receiving portion 46 that protrudes downward in a “V” shape on the left side. A curved reversal leaf spring 43 is disposed between the spring receiving portion 44 and the spring receiving portion 46. Further, a shaft 47 is stretched over the right end portion of the sub-arm 42, and the lower ends of the lifting rods 24 and 31 are connected.
[0022]
Valve means 6 that is a double seat valve is provided on the liquid reservoir space 10 side of the pressure liquid discharge port 17. The valve means 6 includes upper and lower valve cases 61 and 62, an upper and lower valve body 63 and a drain valve shaft 64. The upper valve case 61 and the lower valve case 62 are fixed by screws (not shown), and the upper valve case 61 is fixed to the lid portion 8 by screws (not shown). An upper valve seat 65 is formed in the upper valve case, and a lower valve seat 66 is formed in the lower valve case 62. An upper end of the upper and lower valve bodies 63 is connected to a drain valve shaft 64 by a shaft 67 so as to be swingable. Further, an upper end of the drain valve shaft 64 is connected to a right end portion of the float arm 34 by a shaft 68 so as to be swingable. Yes. The upper / lower valve body 63 moves downward as the float 3 moves upward, separates from the upper / lower valve seats 65, 66, and communicates the liquid reservoir space 10 with the pressure liquid discharge port 17. As shown in FIG. 1, the fluid moves upward and is seated on the upper and lower valve seats 65 and 66 to block the liquid reservoir space 10 and the pressure liquid discharge port 17.
[0023]
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.
[0024]
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. The valve means 6 is closed. 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.
[0025]
When the float 3 rises due to the condensate accumulated in the liquid reservoir space 10, the float arm 34 rotates clockwise about the first shaft 35, and is connected to the drain valve shaft 64. A certain shaft 68 moves downward, the upper and lower valve bodies 63 move downward via the drain valve shaft 64, and the valve means 6 opens.
[0026]
On the other hand, on the snap mechanism 5 side, the left arm of the restraining member 45 comes into contact with the reversing leaf spring 43 (see A in FIG. 3) by the clockwise rotation of the float arm 34, and the reversing leaf spring 43 is moved. Curved in an “S” shape (see B in FIG. 3), the reversing leaf spring 43 is reversed (see C in FIG. 3). By reversing the reversing leaf spring 43, the sub-arm 42 rotates counterclockwise and the shaft 47 snaps upward. As a result, the elevating bars 24 and 31 connected to the shaft 47 move upward, the air supply valve 20 is opened, and the exhaust valve 21 is closed.
[0027]
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).
[0028]
When the condensate is discharged and the water level in the condensate reservoir space 10 is lowered and the float 3 is lowered, the float arm 34 is rotated counterclockwise around the first shaft 35 and the drain valve The shaft 68, which is a connecting portion with the shaft 64, moves upward, follows a completely opposite path, and the valve means 6 is closed.
[0029]
On the other hand, on the snap mechanism 5 side, the right arm of the restraining member 45 comes into contact with the reversing leaf spring 43 by the rotation of the float arm 34 in the counterclockwise direction, and the reversing leaf spring 43 is formed in an “inverted S” shape. The reversing leaf spring 43 is reversed by bending. By reversing the reversing leaf spring 43, the sub-arm 42 rotates in the clockwise direction, and the shaft 47 snaps downward. As a result, the elevating bars 24 and 31 connected to the shaft 47 move downward, the air supply valve 20 is closed, and the exhaust valve 21 is opened.
[0030]
【The invention's effect】
As described above, the liquid pumping device of the present invention has a small number of fulcrums and a small loss of force due to frictional force, so the structure is simple, the operation is smooth, and the switching valve can be switched with a strong force. There is an excellent effect that the liquid can be surely pumped.
[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 taken along the line DD of FIG.
FIG. 3 is an explanatory diagram of a reversing operation of the reversing leaf spring of FIG. 1;
FIG. 4 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 6 Valve means 11 Working fluid inlet 13 Working fluid outlet 16 Pressure liquid inlet 17 Pressure liquid outlet 20 Air supply valve 21 Exhaust valve 34 Float arm 35 1st axis | shaft 37 2nd axis | shaft 42 Subarm 43 Reversing leaf | plate springs 44 and 46 Spring receiving part 45 Suppression member

Claims (1)

A float, a switching valve, and a snap mechanism are incorporated in a sealed container having a working fluid introduction port, a working fluid discharge port, a pressure liquid inlet and a pressure liquid discharge port, and the snap mechanism is supported in the sealed container. A first axis, a float arm rotating about the first axis, and a first arm parallel to the first axis supported in the hermetic container at a point away from the first axis. Two shafts, a secondary arm rotating around the second shaft, a spring receiving portion formed on the float arm, a spring receiving portion formed on the secondary arm, And a reversing leaf spring disposed between the spring receiving portions and a restraining member that restrains the reversing leaf spring by reversing the reversing leaf spring, and the float is connected to the float arm. A liquid pumping device in which the switching valve is connected to the sub-arm.

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