JP3676484B2 - 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 temporarily stores condensate in a sealed container, and further switches the switching valve to introduce a high-pressure working fluid such as steam into the sealed container. Condensate in a sealed container is forcibly discharged.
[0004]
The prior art liquid pumping apparatus will be described below. FIG. 3 is a partial cross-sectional perspective view of a conventional liquid pumping apparatus. FIG. 4 is an enlarged cross-sectional view of a switching valve portion of a conventional liquid pumping device. In FIG. 3, reference numeral 100 denotes a conventional liquid pumping apparatus. The liquid pumping apparatus 100 includes a sealed container 101 in which a float 120, a switching valve 130, a snap mechanism 140, and the like are built.
[0005]
The hermetic container 101 is provided with a pressurized liquid inlet 102 and a pressurized liquid outlet 103 near the bottom, and check valves 105 and 106 are attached to each of them. Here, the check valve 105 is attached in a direction allowing the inflow of condensate into the sealed container 101. On the other hand, the check valve 106 is attached in a direction that allows the condensate to be pumped from the sealed container 101 to the outside.
[0006]
Further, a working fluid inlet 108 and a working fluid outlet 109 are provided at the top of the sealed container 101, and a switching valve 130 including an air supply valve 110 and an exhaust valve 111 is attached as shown in FIGS. ing. Here, the air supply valve 110 and the exhaust valve 111 both open and close by moving the elevating bars 112 and 113 up and down, but the air supply valve 110 is opened when the elevating bar 112 is raised, The exhaust valve 111 is closed when the elevating rod 113 is raised. The elevating rods 112 and 113 are coupled in parallel by the connecting plate 115, and the supply valve 110 and the exhaust valve 111 are simultaneously opened and closed by moving the connecting plate 115 up and down.
[0007]
In the liquid pressure feeding device 100 of the prior art, the pressure feeding liquid inlet 102 is connected to a vapor load via a check valve 105, and the pressure feeding liquid discharge port 103 is connected to a waste heat utilization device via a check valve 106. . The working fluid inlet 108 is connected to a high pressure fluid source. In the liquid pressure feeding device 100, when there is no condensate in the sealed container 101, the float 120 is in the lower position and the connecting plate 115 is lowered. Therefore, in the air supply valve 110, the elevating rod 112 is lowered, and a ball-shaped air supply valve body 122 fixed to the tip of the elevating rod 112 closes the air supply valve port 123. On the other hand, in the exhaust valve 111, a disc-shaped exhaust valve body 127 attached to the tip of the elevating rod 113 opens the exhaust valve port 128, and the working fluid discharge port 109 is opened.
[0008]
When condensate is generated within the steam load to which the liquid pressure feeding device 100 is connected, the condensate flows into the sealed container 101 from the check valve 105 and accumulates. As the amount of condensate increases, the float 120 rises, and one end of the arm 118 rises accordingly. When the arm 118 exceeds a certain position, the snap mechanism 140 is reversed, the valve shaft operating rod 121 moves upward, and the connecting plate 115 is lifted.
[0009]
Then, in the air supply valve 110, the raising / lowering rod 112 attached to the connecting plate 115 rises, the air supply valve body 122 opens the air supply valve port 123, and the working fluid introduction port 108 is opened. On the other hand, since the exhaust valve body 127 closes the exhaust valve port 128 at this time, the working fluid discharge port 109 is closed and the pressure in the hermetic container 101 rises, and the pressure is pushed by the pressure so that condensate is discharged from the pressure liquid discharge port 103. Pumped.
[0010]
[Problems to be solved by the invention]
The liquid pumping device of the prior art can efficiently pump the liquid by opening and closing the switching valve according to the height of the liquid level in the sealed container. However, it requires two valve bodies, an air supply valve body that opens and closes the air supply valve opening and an exhaust valve body that opens and closes the exhaust valve opening, two lifting rods connected to the two valve bodies, a connecting plate, etc. There is a problem that the number of parts is large and the structure is complicated.
[0011]
The present invention pays attention to the above-mentioned problems of the prior art, and an object thereof is to provide a liquid pumping device having a simple structure by reducing the number of parts.
[0012]
[Means for Solving the Problems]
A feature of the present invention is that the air supply port that opens and closes the air supply valve port of the working fluid introduction port in the airtight container is provided with the working fluid introduction port, the working fluid discharge port, the pressure liquid supply port, and the pressure liquid discharge port. An exhaust valve body that opens and closes the valve body and the exhaust valve port of the working fluid discharge port is built-in. Depending on the liquid level of the liquid accumulated in the sealed container, the exhaust valve port is opened first and the air supply valve port is opened. in closed by flowing fluid from the pumping liquid inlet, then a liquid pumping device for pumping accumulated in open closed air supply valve port and the exhaust-valve closed vessel liquid from pumping the liquid outlet, the air supply valve port An open air supply valve seat and an exhaust valve seat with an exhaust valve port opened opposite to the air supply valve port are provided, a switching valve is arranged between both valve ports, and the exhaust valve is located on one side of the switching valve liquid pressure having a valve face of the valve face as the air supply valve element that opens and closes the intake valve port to the other side of the exhaust valve member for opening and closing the mouth Apparatus is in.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The liquid pumping device of the present invention pumps the liquid by opening and closing the switching valve in accordance with the height of the liquid level of the liquid accumulated in the sealed container, as is conventionally known. That is, the valve surface as the exhaust valve body provided on one side of the switching valve first opens the exhaust valve port, and the valve surface as the air supply valve body provided on the other side closes the air supply valve port to press-feed liquid inlet Then, the valve surface as the exhaust valve body closes the exhaust valve port, the valve surface as the air supply valve body opens the air supply valve port, and the liquid accumulated in the sealed container is pumped from the pressure liquid discharge port To do.
[0014]
The switching valve employed in the liquid pressure feeding device of the present invention is disposed between an air supply valve port and an exhaust valve port provided facing each other in the sealed container, and serves as an exhaust valve body that opens and closes the exhaust valve port on one side. Since the valve face is provided with a valve face as an air supply valve body that opens and closes the air supply valve port on the other side, there is no need for a separate connecting plate for connecting to the switching valve, and the number of parts Thus, a liquid pumping device having a simple structure can be produced.
[0015]
【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 a switching valve portion of the liquid pumping device 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.
[0016]
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.
[0017]
An air supply valve seat 21 having an air supply valve port 20 opened at a position inside the working fluid introduction port 11, in other words, on the inside of the sealed container 2 is screwed, and an air supply is provided below the air supply valve port 20. An exhaust valve seat 23 having an exhaust valve port 22 opened facing the valve port 20 is screwed. The switching valve 4 is disposed between the supply valve port 20 and the exhaust valve port 22. Here, the switching valve 4 is spherical, and a valve surface 24 as an exhaust valve body for opening and closing the exhaust valve port 22 on the lower side, and a valve surface 25 as an air supply valve body for opening and closing the air supply valve port 20 on the upper side. Is provided. When the valve surface 24 as the exhaust valve body is separated from the exhaust valve seat 23 and the exhaust valve port 22 is opened, the valve surface 25 as the air supply valve body is seated on the air supply valve seat 21 and the air supply valve port 20 is opened. When the valve surface 24 is closed and the exhaust valve port 22 is closed, the valve surface 25 opens the air supply valve port 20. The switching valve 4 is connected to a snap mechanism 5.
[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 lever 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 integrally attached to the lid portion 8 of the sealed container 2 by screws (not shown). The lever 34 is made 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 portion of the lever 34. A shaft 40 is stretched over the right end of the lever 34, and the lower end of the connecting rod 28 is rotatably supported. The upper end of the connecting rod 28 is rotatably supported by a shaft 58.
[0020]
When viewed from above, the bracket 36 is composed of two “L” -shaped plates, and the shafts 41 and 42 and the shaft 35 described above are spanned and connected. The shaft 35 also serves as the rocking shaft of the float 3. The float 3 swings 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. On the other hand, the bracket 38 is similarly composed of two “L” -shaped plates, and the above-described shaft 37 is spanned and connected.
[0021]
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 opposed in parallel, and the right end portion is rotatably supported by the shaft 37 described above. The left end of the main arm 51 is rotatably supported by the shaft 58 described above. Therefore, the main arm 51 follows up and down of the float 3 via the lever 34 and the connecting rod 28 and swings up and down around the shaft 37.
[0022]
The spring receiving member 55 is rotatably supported on the shaft 58 described above. Further, the intermediate portion of the sub-arm 52 is rotatably supported on the shaft 37 described above. The sub-arm 52 is composed of two plates facing each other in parallel. A shaft 59 is stretched over the left side of the two plates, 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 right end portion of the sub-arm 52, and the switching valve 4 is attached.
[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 valve surface 24 as the exhaust valve body in the switching valve 4 opens the exhaust valve port 22, and the valve surface 25 as the air supply valve body closes the air supply valve port 20. 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 lever 34 rotates clockwise about the shaft 35, the shaft 40 moves downward, and the connecting rod 28 moves downward. As a result, the shaft 58 moves downward. In conjunction with the downward movement of the shaft 58, the main arm 51 rotates counterclockwise about the shaft 37. The shaft 58 approaches the line connecting the shaft 37 and the shaft 59, and the coil spring 54 is compressed and deformed. Then, the float 3 is further lifted, the shaft 58 is aligned on the line connecting the shaft 37 and the shaft 59, and the float 3 is still lifted and the shaft 58 is moved below the line connecting the shaft 37 and the shaft 59. As a result, the coil spring 54 suddenly recovers from deformation, the sub-arm 52 rotates clockwise, and the shaft 60 snaps downward. As a result, the switching valve 4 connected to the shaft 60 moves downward, the valve surface 25 as the supply valve body opens the supply valve port 20, and the valve surface 24 as the exhaust valve body opens to the exhaust valve port 22. Close.
[0026]
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).
[0027]
As a result of discharging the condensate, the water level in the condensate reservoir space 10 is lowered and the float 3 is lowered. Then, the lever 34 rotates counterclockwise about the shaft 35, the shaft 40 moves upward, the connecting rod 28 moves upward, and the shaft 58 moves upward. In conjunction with the upward movement of the shaft 58, the main arm 51 rotates clockwise about the shaft 37. Then, the shaft 58 approaches a line connecting the shaft 37 and the shaft 59, and the coil spring 54 is compressed and deformed. Then, the float 3 is further lowered so that the shaft 58 is arranged on a line connecting the shaft 37 and the shaft 59, and the float 3 is lowered so that the shaft 58 is moved above the line connecting the shaft 37 and the shaft 59. Then, the coil spring 54 rapidly recovers from deformation, the sub arm 52 rotates counterclockwise, and the shaft 60 snaps upward. As a result, the switching valve 4 connected to the shaft 60 moves upward, the valve surface 24 as the exhaust valve body opens the exhaust valve port 22, and the valve surface 25 as the air supply valve body opens the air supply valve port 20. close up.
[0028]
【The invention's effect】
In the liquid pumping device of the present invention, a switching valve is disposed between the air supply valve port and the exhaust valve port provided facing each other in the sealed container, and the exhaust valve body opens and closes the exhaust valve port on one side of the switching valve. The valve surface is provided as an air supply valve body for opening and closing the air supply valve port on the other side. Therefore, there is no need for a connecting plate or the like for connecting to the switching valve. Therefore, the liquid pumping apparatus of the present invention has an excellent effect that the number of parts can be reduced and the structure can be simplified.
[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 a switching valve portion of FIG.
FIG. 3 is a partial cross-sectional perspective view of a prior art liquid pumping device.
4 is an enlarged cross-sectional view of the switching valve portion of FIG. 3;
[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 Supply valve port 22 Exhaust valve port 24 Valve surface as an exhaust valve body 25 Valve face as supply valve

Claims (1)

The airtight valve is provided with a working fluid inlet, a working fluid outlet, a pressure liquid inlet and a pressure liquid outlet, and the air supply valve body for opening and closing the air supply valve opening of the working fluid inlet and the working fluid exhaust in the airtight container. An exhaust valve body that opens and closes the outlet exhaust valve port is built-in, and according to the liquid level of the liquid accumulated in the sealed container, the exhaust valve port is opened first and the air supply valve port is closed to press-feed liquid inlet In a liquid pumping device that allows liquid to flow in, then closes the exhaust valve port and opens the air supply valve port to pump the liquid accumulated in the sealed container from the pressure liquid discharge port, the air supply valve with the air supply valve port opened Exhaust valve seat that has an exhaust valve seat that opens the exhaust valve port opposite the seat and this air supply valve port, places a switching valve between both valve ports, and opens and closes the exhaust valve port on one side of the switching valve liquid pressure, characterized in that a valve surface of the valve face of the body as the air supply valve element that opens and closes the intake valve port to the other side Apparatus.

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