JP4955572B2 - Pump - Google Patents

Description

  The present invention relates to a pumping pump that can reduce the force required for pumping by using buoyancy together, and more particularly to a pumping pump configured to discharge pressurized water from a pump outlet.

  A variety of pumping pumps for pumping water from wells, rivers, ponds, etc. have been proposed and put into practical use. Normally used pumps are roughly classified into an electric type using an electric motor as a power source and a manual type using human power. Since the electric pumps generally use a power source, there is a problem that they cannot be used when a power failure occurs during a disaster. In addition, manual pumps require considerable force during pumping, and are often difficult for children and elderly people to use, and they require priming water. However, there was a problem that the place of use was limited.

  In view of this, the present applicant, in Japanese Patent No. 3457301 (Patent Document 1), comprises a hollow structure outer tube having a suction port and a discharge port, and a hollow structure reciprocating rod inserted reciprocally into the outer tube. Further, a pumping pump having a structure having a gap for water passage between the inner surface of the outer tube and the outer surface of the reciprocating rod has been proposed. In this pump, the reciprocating rod inserted into the hollow outer tube has a hollow structure, so that buoyancy is generated in the reciprocating rod. It has the feature that it can be pumped up to a height. Moreover, since it is a simple structure, since the pumping pump can be reduced in weight, it also has the characteristic that it can carry easily.

  That is, the pumping pump disclosed in Patent Document 1 has a double structure in which a hollow structure outer tube and a reciprocating rod having a size capable of reciprocating inside the outer tube are inserted, and the outer tube includes a suction port, a discharge port It has a mouth and a suction valve is provided in the suction mouth. On the other hand, a piston is attached to the tip of the reciprocating rod, and a suction hole is provided at the center of the piston and a discharge valve is provided. The suction valve and the discharge valve are configured to open and close by the vertical movement of the reciprocating rod.

  And in the process of pulling up the reciprocating rod upward, the discharge valve is closed and the space formed between the piston and the suction valve is decompressed, so that the suction valve is opened and the liquid is sucked up from the suction port. It is done. Next, in the process of depressing the reciprocating rod, the liquid filled between the piston and the suction valve 28 is compressed, so that the suction valve is closed and the discharge valve is opened. It is pumped up between the reciprocating rods and is eventually discharged from the spout.

Japanese Patent No. 3457301

  In the pumping pump according to Patent Document 1, when the liquid pumped up between the outer tube and the reciprocating rod is full, the discharge valve is closed in the stroke of pulling the reciprocating rod upward, so that the pump reciprocates. In the stroke where the liquid between the rod is pushed up and the overflowing liquid is discharged from the discharge port and the reciprocating rod is pushed down, the discharge valve opens and the liquid is fed, so that the liquid between the outer tube and the reciprocating rod is It is pushed up and the overflowing liquid is discharged from the outlet. That is, since the overflowing liquid between the outer tube and the reciprocating rod is discharged from the discharge port by the vertical movement of the piston of the reciprocating rod, the water pressure inside the pump is small, so that it is smaller than the discharge port. There was a problem that water could not be sent to the upper position. For this reason, for example, when the liquid is pumped up to a high position of several meters or more, the pumping pump itself must have a length of several meters or more so that the position of the discharge port is high. Such a long pump has a serious problem that it becomes difficult to handle and the price is so high that it cannot meet the needs of the user.

  The present invention has been made in order to solve the above-described problems, and it is possible to add water in the pump with a simple and inexpensive configuration without impairing the characteristics that can reduce the force required for pumping by using buoyancy. An object of the present invention is to provide a pump that can discharge liquid to a higher position or a distance from the discharge port by applying pressure.

In order to solve the above-mentioned problem, the pump according to the invention of claim 1 is
A reciprocating rod having a suction port having a suction valve provided at the lower end side and a hollow outer tube having a discharge port provided at the upper end side, and a piston having a discharge valve at the lower end, which is removably inserted into the outer tube. A pump having a structure for passing a liquid between the inner surface of the outer tube and the outer surface of the reciprocating rod,
The gist is to provide a seal that allows the reciprocating rod to move up and down above the outlet of the outer tube and seals the upper end of the gap.
The gist of the invention described in claim 2 is that, in the invention of claim 1, a backflow prevention valve for preventing backflow in the gap direction is provided at the outlet.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the reciprocating bar inserted into the outer tube is formed of a hollow pipe or a low specific gravity bar, and is inserted into the reciprocating bar. The gist is that the reciprocating rod has a specific gravity smaller than that of the liquid so as to prevent the liquid from entering.
According to a fourth aspect of the present invention, in the first, second, or third aspect of the invention, a cap is detachably provided at the upper end of the outer tube, and the seal in the outer tube is detachable when the cap is detached. The gist is that it was configured.

According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect of the invention, the seal is provided in an annular shape that is externally fitted to the reciprocating rod, and at least the pressure is not applied in the pump. The packing is arranged so as not to be substantially compressed in the axial direction of the pump, and is sealed between the outer surface of the reciprocating rod and the inner surface of the upper end portion provided integrally with the outer tube. To do.
The invention described in claim 6 is characterized in that, in the invention of claim 1, 2, 3, 4 or 5, the packing is constituted by a plurality of flat packings stacked in a plurality of layers. To do.

  According to the pump according to the present invention, it becomes possible to apply pressure to various liquids (hereinafter simply referred to as liquid) such as water, oil, seasonings, and chemicals pumped into the pump by human power. Can be pumped up high or released far away. In addition, it is possible to use a device that requires pressure.

  In addition, by making the specific gravity of the reciprocating rod inserted into the outer tube smaller than the specific gravity of the liquid to be pumped, buoyancy can be generated in the reciprocating rod, and the pumping operation by human power becomes easy and the pumping efficiency is further increased. Is possible.

  In addition, a removable cap is provided on the upper part of the outer tube so that the seal can be removed, so that when the seal is removed depending on the pumping conditions desired by the user, water can be removed with a slight force as with conventional pumps. The pump can be pumped up to the height of the discharge port, and when a seal is installed, the liquid can be pressurized to pump the liquid from the discharge port to a high place, or it can be installed in equipment that requires water with pressure. Even though they are the same pump, they can be used easily according to the application.

It is sectional drawing which shows the structure of the pumping pump which can be pressurized by this invention. (A) (B) is operation | movement explanatory drawing which shows the operation state of the pumping pump by this invention. It is principal part sectional drawing which shows the 1st Example which comprised the seal | sticker in an outer tube so that attachment or detachment was possible. It is principal part sectional drawing which shows the 2nd Example comprised so that the seal | sticker in an outer tube could be attached or detached. It is principal part sectional drawing which shows the 3rd Example comprised so that the seal | sticker in an outer tube could be attached or detached. It is principal part sectional drawing which shows the other example of a form of a seal | sticker.

Explanation of symbols

10 Pump 20 Outer pipe 23 Suction port 24 Suction port 26 Insertion port 27 Seal 27A Packing 27a Flat packing 28 Suction valve 29 Seal exchange cap 30 Reciprocating bar 33 Handle 34 Piston 36 Mounting tool 38 Suction valve 40 Suction hole 50 Backflow prevention valve 51 Water discharge Pipe 52 nozzle

The pump is equipped with a hollow outer tube that has a suction port with a suction valve on the lower end side and a discharge port on the upper end side, and a piston that has a discharge valve at the lower end that is removably inserted into the outer tube. The reciprocating rod is configured to have a gap for passing liquid between the inner surface of the outer tube and the outer surface of the reciprocating rod. A seal that allows the reciprocating rod to move up and down and seals the upper end side of the gap is provided above the outlet of the outer pipe of the pump.
Further, the discharge port is provided with a backflow prevention valve for preventing the liquid from flowing back in the gap direction.

The reciprocating rod inserted into the outer tube is formed of a hollow pipe, a low specific gravity rod material, or a hollow pipe filled with a low specific gravity material, and the liquid enters the reciprocating rod. The specific gravity of the reciprocating rod is made smaller than that of the liquid, and buoyancy is generated in the reciprocating rod.
Furthermore, a cap is detachably provided at the upper end of the outer tube, and the seal in the outer tube is detachable when the cap is detached.

In addition, the seal is provided in an annular shape that is externally fitted to the reciprocating rod, and is disposed so as not to be substantially compressed in the axial direction of the pump in a state where no pressure is applied in the pump, It can comprise so that it may be a packing sealed between the inner surfaces of the upper end part integrally provided in the said outer tube | pipe.
Further, the packing can be constituted by a plurality of flat packings stacked in a plurality of layers.

  An embodiment of a pumping pump according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a structure of a pumping pump capable of pressurizing inside an outer tube. The pumping pump 10 has a double structure in which an outer tube 20 having a hollow structure and a reciprocating rod 30 having a size capable of reciprocating inside the outer tube are inserted. The outer tube 20 has a suction port 23, a discharge port 24, and a reciprocating rod insertion port 26, and a suction valve 28 is provided in the suction port 23, and a discharge valve 38 is provided in the suction hole 40.

  In the pump 30, the reciprocating rod 30 has a piston 34 attached to a tip on the lower end side via an attachment 36. The piston 34 is formed in a disk shape, and the piston diameter is set slightly smaller than the inner diameter of the outer tube 20 so as to ensure a clearance as a clearance in order to facilitate the operation when reciprocating inside the outer tube 20. Has been. Further, a suction hole 40 that is slightly smaller than the size of the discharge valve 38 is provided at the center of the piston 34. The attachment 36 supports the piston 34, and has a function for allowing the liquid that has passed through the suction hole 40 to pass through the discharge valve and to communicate with the gap between the outer tube 20 and the reciprocating rod 30. Have. Further, a handle 33 for reciprocating the reciprocating bar 30 is provided on the upper end side of the reciprocating bar 30 located on the discharge port 24 side of the outer tube 20.

  The reciprocating rod 30 is formed of a hollow pipe, a low specific gravity rod material, or a hollow pipe filled with a low specific gravity material, and is configured to prevent the liquid from entering the reciprocating rod 30. Has been. Incidentally, it is desirable to set the specific gravity of the reciprocating rod 30 to about 0.9 to 0.3. As a result, since the specific gravity of the reciprocating rod 30 is smaller than that of the liquid, buoyancy is generated in the reciprocating rod 30. In FIG. 1, the lower end side tip of the reciprocating rod 30 is opened and the upper end side is closed. In a normal use state, as shown in FIG. 1, even if the lower end of the reciprocating bar 30 is opened, it is only slightly moved into the interior due to the pressure of the liquid. It is desirable to close the lower end side tip by appropriate means. In addition, the buoyancy may be adjusted by allowing liquid to enter a part of the hollow by means such as providing a plug on the reciprocating bar 30, and inside the reciprocating bar 30 above the plug. You may comprise so that the entrance of a liquid may be blocked | prevented.

  On the other hand, an insertion port 26 for inserting the reciprocating rod 30 is provided on the upper end side of the outer tube 20, and the vicinity of the insertion port 26 is formed of a material such as synthetic rubber such as an O-ring or synthetic resin. A seal 27 is attached. The seal 27 is formed in an annular shape, and has an inner diameter that allows the reciprocating rod 30 to move up and down. Thereby, the upper end side of the space between the outer tube 20 and the reciprocating rod 30 is almost sealed.

  A cap 29 having a through hole through which the reciprocating rod 30 is inserted is attached to the insertion port 26 on the upper end side of the outer tube 20. The cap 29 is configured to be detachable. Accordingly, when the cap 29 is detached from the outer tube 20, the insertion port 26 can be opened, and the seal 27 in the vicinity of the insertion port 26 can be attached and detached or replaced.

The discharge port 24 is provided with a backflow prevention valve 50 so that the liquid discharged from the discharge port 24 does not flow back into the gap between the outer tube 20 and the reciprocating rod 30. Further, a nozzle 52 is fixed outside the backflow prevention valve 50, and the flow velocity is increased by narrowing the diameter. Thereby, the accelerated liquid can be discharged by directing the water discharge pipe 51 attached to the nozzle 52 in any direction regardless of the horizontal direction or the vertical direction.
In addition, you may provide the backflow prevention valve 50 in the side to which liquids, such as the water discharge pipe 51, are supplied. Furthermore, an opening / closing adjustment valve may be provided on the piping side such as the discharge port 24 and the water discharge pipe 51 to adjust the liquid pressure.

  Next, the operation of the pumping pump 10 will be described with reference to FIG. The suction valve 28 and the discharge valve 38 in the pumping pump 10 are configured to open and close as the reciprocating rod 30 moves up and down. In the process of pulling the reciprocating rod 30 upward, the discharge valve 38 is closed, and the space formed between the piston 34 and the suction valve 28 is decompressed, whereby the suction valve 28 is opened, and water, Liquids such as oil, seasonings, and chemicals are sucked up from the suction port 23. Subsequently, in the process of pushing down the reciprocating rod 30, the liquid filled between the piston 34 and the suction valve 28 is compressed, so that the suction valve 28 is closed and the discharge valve 38 is opened, and the liquid is pumped up to the upper part of the piston 34. It is done. In the initial stage of activation, the reciprocating rod 30 is moved up and down several times, so that the liquid that has passed through the fitting 36 is pumped up into the gap between the outer tube 20 and the reciprocating rod 30 and eventually fills the gap. .

  When the reciprocating rod 30 is pushed down from this state, as shown in FIG. 2A, the suction valve 28 of the outer tube 20 is closed and the liquid filled between the piston 34 and the suction valve 28 is compressed. The discharge valve 38 of the reciprocating rod 30 is opened, and the liquid moves to the gap between the outer tube 20 and the reciprocating rod 30. At this time, since the cap 29 is attached to the upper end side of the outer tube 20 and the gap between the gaps is formed small, the liquid moved to the gap is pressurized by being compressed. Further, the backflow prevention valve 50 provided at the discharge port 24 is opened by the pressure of the liquid. As a result, the liquid is ejected vigorously from the discharge port 24, the flow velocity of the liquid is increased by the nozzle 52 whose diameter is narrowed, and the accelerated liquid is discharged from the water discharge pipe 51 attached to the nozzle 52.

  Thereafter, when the reciprocating rod 30 is pulled upward, as shown in FIG. 2 (B), the space between the piston 34 and the suction valve 28 is in a reduced pressure state, so that the suction valve 28 of the outer tube 20 is opened and the suction valve is opened. The liquid is sucked up from 28, and the liquid is filled between the piston 34 and the suction valve 28. Also, by lifting the reciprocating rod 30, the liquid remaining in the gap is lifted to the discharge port 24, and the backflow prevention valve 50 is slightly opened and flows out from the discharge port 24 as shown by the dotted line. As described above, by moving the reciprocating rod 30 up and down, the liquid can be pumped and the pressurized liquid can be discharged from the discharge port 24.

  As a result of the experiment, it was confirmed that the water pressure at the position of the discharge port 24 reached 10 kg or more at the maximum. In addition, when the water discharge pipe 51 was extended in the vertical direction, it was confirmed that the water was pumped up to a height of 20 m or more. The ratio of the inner diameter D of the outer tube 20 and the outer diameter d of the reciprocating rod 30 in the pumping pump 10 is set to 0.95D ≧ d ≧ 0.3D. However, in order to discharge the liquid to a high place or far away, it is necessary to increase the pressure of the liquid. In this case, it is possible to reduce the volume of the gap by setting the ratio in the range of 0.6 to 0.95 and increase the pressure in the gap. Further, when pumping up to a higher place, it is desirable to provide one or more backflow prevention valves in the middle part of the water discharge pipe 51 attached to the nozzle 52.

  When the handle 33 of the pumping pump 10 configured as described above is reciprocated up and down and the reciprocating rod 30 is reciprocated, the weight of the liquid applied to the piston 34 and the discharge valve 38 increases as the liquid is sucked up from the suction port 23. To do. However, since the specific gravity of the reciprocating bar 30 is smaller than that of the liquid, buoyancy is generated when the reciprocating bar 30 is immersed in the liquid. Therefore, the lifting force of the handle 33 required for pumping up by this buoyancy can be reduced.

  Such a pump is capable of pumping if the hydrostatic level of the liquid to be pumped is at least above the suction valve 28. For this reason, the pumping pump does not require priming water, and pumping can be performed only by immersing the suction valve 28 in the liquid. Therefore, when it is carried to the place of use, it can be used directly without any prior preparation, and the liquid pumping operation can be speeded up.

  3 to 5 show an embodiment in which the seal in the outer tube is detachable. FIG. 3 shows the first embodiment, and a removable cap 29 having a seal 27 is provided at the upper end of the outer tube 20. That is, the cap 29 is formed in a substantially cup shape, a through hole through which the reciprocating rod 30 is inserted is formed in the center of the bottom portion, and a screw portion is formed on the inner surface on the opening side. Further, the cap 29 is internally provided by fixing the outer surface of the seal 27 described above. On the other hand, on the inner side of the upper end of the outer tube 20, a connecting member 22 having a threaded portion formed on the outer periphery is provided. And it is comprised so that it may connect by screwing the thread part of the cap 29 to the thread part of the connection member 22. As shown in FIG. Further, a connecting member 32 having a screw portion formed thereon is fitted to the upper end of the reciprocating rod 30, and a holding tool 34 to which a handle 33 is attached is screwed into the connecting member 32. With this configuration, the handle 33 itself is also detachable. When the cap 29 is provided, the handle 33 is detached, the upper end of the reciprocating rod 30 is inserted into the through hole of the cap 29, and then screwed into the threaded portion of the connecting member 22. It can be mounted by attaching a handle 33 to the frame.

  FIG. 4 shows a second embodiment. The difference from FIG. 3 is the connection structure between the outer tube 20 and the cap 29. That is, a thread portion is formed on the outer periphery of the upper end of the outer tube 20 and the inner surface on the opening side of the cap 29, and further, a thread portion is formed on the inner periphery of the cylindrical connecting member 22A. Then, the screw portion of the connecting member 22 </ b> A is connected to the screw portion of the outer tube 20 and the screw portion of the cap 29 by screwing.

  FIG. 5 shows a third embodiment. That is, the inner diameter on the upper end side of the outer tube 20 is formed large, and a thread portion is formed on the inner surface thereof. A screw portion is formed on the outer surface of the cap 29 on the opening side. Then, the threaded portion of the cap 29 is screwed into the threaded portion of the outer tube 20 so that both are connected.

  As described above, the removable cap 29 is provided at the upper end of the outer tube 20 and the seal 27 is configured to be detachable, whereby the pumping condition desired by the user can be selected. As described above, when discharging the liquid at a higher position or farther than the discharge port 24 of the pumping pump 10, it is advantageous to attach the seal 27 and pressurize the inside of the pump 10, and a position lower than the discharge port 24. It is advantageous to disengage the seal 27 so that no pressure is applied to the interior of the pump 10 when it is discharged. Therefore, by attaching and detaching the seal 27 according to the purpose of use and the situation, it is possible to easily use the seal 27 according to the purpose even though it is the same pump.

Next, another embodiment of the seal will be described with reference to FIG.
The seal shown in FIG. 6 is provided in an annular shape that fits around the reciprocating rod 30, and is arranged so as not to be substantially compressed in the axial direction of the pump 10 in a state where no pressure is applied in the pump 10. It is comprised by the packing 27A sealed between an outer surface and the inner surface of the upper end part 21 provided in the outer tube 20 integrally.
The packing 27A can be constituted by a plurality of flat packings stacked in a plurality of layers. The packing 27A of this embodiment is configured by overlapping two rubber flat packings 27a and 27a. In this form, it has been confirmed that it can withstand water pressure of at least 15 kg and can be watertight.

More specifically, as shown in FIG. 6, the inner diameter of the packing 27 </ b> A is set to be substantially the same as the outer diameter of the reciprocating rod 30. For this reason, the reciprocating rod 30 has almost no sliding resistance and can operate smoothly. Further, the outer diameter is set to be smaller than the inner diameter of the joint 22 </ b> B constituting a part of the outer pipe 20. And this packing 27A is distribute | arranged inside the outer tube | pipe 20 in the state which is not pinched from the up-down direction by the solid member.
As a result, the packing 27 </ b> A is in a state where it can move in a predetermined slight range in the axial direction of the pump 10 in a state where no pressure is applied in the pump 10. That is, the packing 27 </ b> A is arranged so as not to be substantially compressed in both the axial direction of the pump 10 and the direction orthogonal to the axis of the pump 10 in a state where no pressure is applied in the pump 10.
For this reason, it has a structure in which the liquid pressure can directly act on at least the lower surface and the outer peripheral surface of the packing 27A. The lower surface and the outer peripheral surface of the packing 27 </ b> A are surfaces that do not contact the inner surface of the upper end portion 21 and the outer surface of the reciprocating rod 30.

According to the seal described above, watertightness between the outer surface of the reciprocating bar 30 and the inner surface of the upper end portion 21 is substantially watertight between the reciprocating bar 30 and the outer tube 20. Here, the upper end portion 21 is a portion provided integrally with the outer tube 20 and is provided with a cap 29A in this embodiment. An inner end surface portion of the cap 29 </ b> A is an inner surface of the upper end portion 21. The cap 29A is screwed into a female thread portion formed on one side of the joint 22B, and is fixed and integrated with the outer tube 20, and is watertight via a seal tape. The other end of the joint 22B is connected by press-fitting a long pipe 20a, and the outer pipe 20 is constituted by the joint 22B and the pipe 20a.
Reference numeral 60 denotes a guide sleeve, which is provided in a cylindrical shape so as to be inserted into the outer tube 20 from the joint 22B to the tube material 20a, and the reciprocating rod 30 is inserted into the tube. The upper end flange portion 60a is provided so as to be engaged with the stepped portion of the joint 22B, thereby restricting the arrangement position. According to the guide sleeve 60, the operation of the reciprocating rod 30 is guided, and the upper surface of the upper end flange portion 60a is provided so as to be in contact with the lower surface of the packing 27A, and acts to restrict deformation and movement of the packing 27A. To do.

According to the seal constituted by the packing 27A as described above, watertightness can be suitably ensured and the movement of the reciprocating bar 30 is not hindered. In particular, according to the packing 27A composed of the two rubber flat packings 27a and 27a, it is possible to withstand higher pressure without impeding the movement of the reciprocating bar 30. This is presumably because the packing 27 </ b> A is suitably compressed and deformed in response to the pressure increase in the pump 10 and can contact the outer peripheral surface of the reciprocating bar 30 in a balanced manner. Thereby, a liquid such as water can be discharged from the discharge port 24 in a high pressure state without feeling the sliding resistance (friction resistance) of the reciprocating rod 30.
On the other hand, in a conventional sealing method using a sealing material such as an O-ring or packing having a V-shaped cross section, the reciprocating rod 30 may not move if watertightness is ensured. On the other hand, if the movement of the reciprocating rod 30 is ensured, watertightness may not be achieved. For example, the O-ring is arranged in a compressed state in accordance with the maximum pressure even when no pressure is applied in the pump, so that the sliding resistance of the reciprocating rod 30 is large from the initial stage. Further, in the packing having a V-shaped cross section, as the pressure applied in the pump increases, the contact pressure for watertightness increases, and the sliding resistance of the reciprocating rod 30 gradually increases.

  In addition, the pumping pump concerning this invention is not limited to the said Example, It can change suitably in the range which does not deviate from this invention. For example, the discharge valve provided on the piston may be changed to a ball made of a material such as glass or metal in addition to the tongue-shaped valve. Of course, the length, outer diameter, and material of the outer pipe, the extended outer pipe, the reciprocating bar, and the extended reciprocating bar of the pump are variously changed.

The present invention is applied to pumping pumps for pumping water from wells, rivers, ponds, etc., oil, chemicals, etc., as well as water supply to the upper floors of buildings such as houses and buildings, drainage from ship bottoms, etc. To make it available for use.
Moreover, the seal structure concerning this invention and the pump using the seal structure are not limited to liquid use, It can utilize also for the gas which requires airtight, such as air. In other words, it can be used in fields where high sealing performance and low sliding resistance are required for the operation of the reciprocating bar and the like.

Claims (5)

A reciprocating rod having a suction port having a suction valve provided at the lower end side and a hollow outer tube having a discharge port provided at the upper end side, and a piston having a discharge valve at the lower end, which is removably inserted into the outer tube. is composed of, have a gap that passed through the liquid between the inner and outer surfaces of the reciprocating rod of the outer tube,
A pumping pump provided with a seal that allows the reciprocating rod to move up and down above the outlet of the outer tube and seals the upper end of the gap ,
The seal is provided in an annular shape that is fitted around the reciprocating rod , and the inner diameter of the seal and the outer diameter of the reciprocating rod are set to be the same so that the seal is not substantially compressed when no pressure is applied in the pump. And the outer diameter of the seal is set to be smaller than the inner diameter of the outer pipe so that the seal can move in the axial direction of the pump, and the outer surface of the reciprocating bar and the outer pipe are integrated. A pumping pump characterized by being a flat packing that is not an O-ring or a V-shaped packing used in a conventional sealing method so as to seal between the inner surface of the upper end portion provided. The flat packing is, the pump pumping according to claim 1, characterized in that it is constituted by a plurality of flat packing superimposed in a plurality of layers.   The pump according to claim 1 or 2, wherein a backflow prevention valve for preventing a backflow in the gap direction is provided at the discharge port.   The reciprocating rod inserted into the outer tube is formed of a hollow pipe or a low specific gravity rod material, and is configured to prevent the liquid from entering the reciprocating rod, thereby reducing the specific gravity of the reciprocating rod. The pump according to claim 1, 2 or 3, wherein the pump is smaller than the liquid.   The pump according to claim 1, 2, 3, or 4, wherein a cap is detachably provided at an upper end of the outer tube, and the seal in the outer tube is detachable when the cap is detached.

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