WO2007063759A1

WO2007063759A1 - Suction pump

Info

Publication number: WO2007063759A1
Application number: PCT/JP2006/323327
Authority: WO
Inventors: Masao Yamada
Original assignee: Yugen Kaisha Asahikoumuten; Miyairi, Kenichiro
Priority date: 2005-11-29
Filing date: 2006-11-22
Publication date: 2007-06-07
Also published as: JPWO2007063759A1; JP4955572B2

Abstract

A suction pump capable of discharging a liquid to a place higher than a discharge port or to a place far apart from the discharge port by pressurizing the water in the pump with a simple and low cost structure without impairing such a feature that a force required for pumping up the water can be reduced by utilizing buoyancy. The suction pump (10) comprises a hollow outer tube (20) having a suction port (23) and the discharge port (24) and a hollow reciprocating rod (30) inserted into the outer tube and capable of reciprocating. A clearance for passing the water is formed between the inner surface of the outer tube and the outer surface of the reciprocating rod. When the reciprocating rod (30) including a piston (34) with a suction hole (40) and a discharge valve (38) installed on the piston is vertically moved, the pumped-up liquid is pressurized to lift it to any height in an optional direction through a reverse flow prevention valve (50) provided at the discharge port (24).

Description

Specification

Pump

Technical field

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

Background art

[0002] A variety of pumping pumps for pumping water from wells, rivers, ponds, etc. have been proposed and put into practical use. The pumps that are usually used are roughly classified into electric types that use an electric motor as a power source and manual types that use human power. Since electric pumps generally use a power source, there is a problem that they cannot be used when a power failure occurs during a disaster. Also, manual pumping pumps require considerable force during pumping, and are often difficult for children and elderly people to use. The problem was that the height was small and the place of use was restricted.

[0003] In view of this, the applicant of Patent No. 3457301 (Patent Document 1) disclosed a hollow structure outer tube having a suction port and a discharge port, and a hollow structure that is reciprocally inserted into the outer tube. Proposed a pump that has a structure that has a water passage between the inner surface of the outer tube and the outer surface of the reciprocating rod. In this pump, the reciprocating rod inserted into the hollow outer tube is formed into 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. In addition, since it has a simple configuration, the pumping pump can be reduced in weight, so that it can be easily carried.

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 has a suction port. And a discharge port, and a suction valve is provided at the suction port. On the other hand, the reciprocating rod has a piston attached to the tip and a suction hole in the center of the piston. There is a discharge valve. Each of the suction valve and the discharge valve is configured to open and close by the vertical movement of the reciprocating rod.

[0005] In the process of pulling 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 released. Is sucked up from the mouth. Next, in the process of pushing down 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 and down between the back and forth rods, and then it is discharged and the loca is discharged.

[0006] Patent Document 1: Japanese Patent No. 3457301

Disclosure of the invention

Problems to be solved by the invention

[0007] 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 lifting the reciprocating rod upward. Therefore, the liquid between the outer tube and the reciprocating rod is pushed up, the overflowing liquid is discharged from the discharge port, and in the process of pushing down the reciprocating rod, the discharge valve is opened and the liquid is sent to the outer tube and the reciprocating rod. The liquid in between is pushed up, and the overflowing liquid is discharged from the outlet. That is, in order to discharge the overflowing liquid between the outer tube and the reciprocating rod by the vertical movement of the piston of the reciprocating rod, and also to discharge the mouth force, the water pressure inside the pump is small! / There was a problem that water could not be delivered to the position above the spout. For this reason, for example, when pumping liquid to a high position of several meters or more, the pump itself must be several meters or longer so that the discharge port is at a high position. Such a long pump has become a serious problem that it is difficult to handle and the price is so high that it cannot meet the needs of users.

[0008] The present invention has been made to solve the above-described problems, and has a simple and inexpensive configuration without impairing the characteristics that can reduce the force required for pumping by using buoyancy. It is an object of the present invention to provide a pump that can discharge liquid to a higher location or farther than the spout by pressurizing the water. Means for solving the problem

[0009] In order to solve the above-described problem, a pumping pump that is powerful in the invention of claim 1 is a hollow structure in which a suction and suction port having a suction valve is provided at the lower end side and a discharge port is provided at the upper end side. An outer tube and a reciprocating rod that is reciprocally inserted into the outer tube and has a piston having a discharge valve at the lower end. A liquid is provided between the inner surface of the outer tube and the outer surface of the reciprocating rod. A pump having a structure for passing water,

The gist is that a seal that allows the reciprocating rod to move up and down and seals the upper end of the gap is provided above the outlet of the outer tube.

The gist of the invention of 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.

[0010] Further, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the reciprocating bar inserted into the outer tube is formed of a hollow or a low specific gravity rod, and the reciprocating bar The gist of the invention is that the liquid is prevented from entering the inside of the casing, and the specific gravity of the reciprocating bar is made smaller than that of the liquid.

The invention according to claim 4 is the invention according to claim 1, 2 or 3, wherein a cap is detachably provided at the upper end of the outer tube, and the seal in the outer tube can be detached when the cap is detached. The gist of this is

[0011] Further, the invention according to claim 5 is the invention according to claim 1, 2, 3 or 4, wherein the seal is provided in an annular shape that is externally fitted to the reciprocating rod, and pressure is provided in the pump. Is arranged so that it is not substantially compressed at least in the axial direction of the pump in a state where no force is applied, and between the outer surface of the reciprocating rod and the inner surface of the upper end portion provided integrally with the outer tube. It is a packing for sealing.

The invention according to claim 6 is the invention according to claim 1, 2, 3, 4 or 5, wherein the packing is constituted by a plurality of flat packings stacked in a plurality of layers! It is characterized by reverberation.

The invention's effect

[0012] According to the pump according to the present invention, it is possible to apply pressure to various liquids (hereinafter simply referred to as liquids) such as water, oil, seasonings, and chemicals pumped into the pump by human power. It becomes possible to pump up to a higher place than the spout or discharge it far away. In addition, it is possible to use a device that requires pressure.

[0013] Further, by making the specific gravity of the reciprocating rod inserted into the outer pipe 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 Can be further increased.

[0014] In addition, a removable cap is provided on the upper part of the outer tube so that the seal can be attached and detached, so that when the seal is removed according to the pumping conditions desired by the user, it is similar to a conventional pump. Water can be pumped up to the height of the discharge port with a slight force.When a seal is installed, the liquid is pressurized to pump the liquid from the discharge port to a high place, and water with pressure is required. This makes it possible to easily use them according to the application even though they are the same pump.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing the structure of a pressurizable pumping pump according to the present invention.

[021] (A) and (B) are operation explanatory views showing an operation state of the pumping pump according to the present invention.

FIG. 3 is a cross-sectional view of a principal part showing a first embodiment in which a seal in an outer tube is detachable.

FIG. 4 is a cross-sectional view of an essential part showing a second embodiment in which the seal in the outer tube is detachable.

FIG. 5 is a cross-sectional view of a principal part showing a third embodiment in which the seal in the outer tube is detachable.

FIG. 6 is a cross-sectional view of the main part showing another example of the seal.

Explanation of symbols

[0016] 10 pump

20 outer pipe

23 Suction mouth

24 Outlet 27A packing

27a Flat packing

28 Suction valve

29 Seal replacement cap

30 reciprocating bar

33 Handle

34 Piston

36 fittings

38 Exhaust valve

40 Suction hole

50 Check valve

51 Water discharge pipe

52 nozzles

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] The pump includes a hollow outer tube having a suction port having a suction valve on the lower end side and a discharge port on the upper end side, and a retraction valve inserted into the outer tube so as to reciprocate. The piston has a reciprocating rod to which a piston is attached, and has a structure for passing a liquid between the inner surface of the outer tube and the outer surface of the reciprocating rod. Above the discharge port of the outer pipe of the pump, there is provided a seal that allows the reciprocating rod to move up and down and seals the upper end side of the gap.

Further, the discharge port is provided with a backflow prevention valve for preventing the liquid from flowing back in the gap direction.

[0018] 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 reciprocating rod inside the reciprocating rod is inserted into the reciprocating rod. The reciprocating bar is configured to prevent the liquid from entering, and the specific gravity of the reciprocating bar is made smaller than that of the liquid to generate buoyancy.

Furthermore, a cap is detachably provided at the upper end of the outer tube, and the cap is detached. The seal in the outer tube is configured to be detachable.

[0019] The seal is provided in an annular shape that is externally fitted to the reciprocating rod, and is disposed in the pump so as not to be substantially compressed in at least the axial direction of the pump in a state where no pressure force S is applied. It is possible to configure such that the seal is sealed between the outer surface of the outer tube and the inner surface of the upper end portion provided integrally with the outer tube.

Further, the packing can be constituted by a plurality of flat packings stacked in a plurality of layers.

Example 1

[0020] 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 the structure of a pumping pump capable of pressurizing inside the outer tube. The pump 10 has a double structure in which a hollow outer tube 20 and a reciprocating rod 30 having a size capable of reciprocating inside the outer tube are inserted. The outer pipe 20 has a suction port 23, a discharge port 24, and a reciprocating rod spout 26. A suction valve 28 is provided in the suction port 23, and a discharge valve 38 is provided in the suction hole 40.

[0021] The reciprocating rod 30 in the pumping pump 10 has a piston 34 attached to an end on the lower end side via an attachment 36. The piston 34 is formed in a disc shape, and the piston diameter is slightly smaller than the inner diameter of the outer tube 20 so as to secure a clearance as a clearance in order to facilitate the operation when reciprocating the inner portion of the outer tube 20. Is set. A suction hole 40 slightly smaller than the size of the discharge valve 38 is provided in the center of the piston 34. The attachment 36 has a function for supporting the piston 34, and the function that allows the liquid that has passed through the suction hole 40 to pass through the discharge valve and further communicate with the gap between the outer tube 20 and the reciprocating rod 30. Have. A handle 33 for reciprocating the reciprocating rod 30 is provided on the upper end side of the reciprocating rod 30 located on the outlet 24 side of the outer tube 20.

[0022] The reciprocating rod 30 is formed of a hollow structure pipe, a low specific gravity rod material, or a hollow nove filled with a low specific gravity material, and the force also allows the liquid to enter the reciprocating rod 30. It is configured to block. 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 addition, in FIG. 1, the lower end side tip of the reciprocating rod 30 is opened, The upper end side is closed. Under normal conditions of use, as shown in Fig. 1, even if the lower end of the reciprocating bar 30 is opened, it only enters the interior slightly due to the pressure of the liquid. It is desirable to close the tip of the lower end of 30 by appropriate means. The buoyancy may be adjusted by allowing the liquid to enter a part of the hollow by means such as providing a plug on the reciprocating bar 30. It may be configured to prevent liquid from entering!

[0023] 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 a synthetic rubber such as an O-ring or a synthetic resin is provided in the vicinity of the insertion port 26, for example. A seal 27 made of material is installed. 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 at the center. 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. Thus, 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.

In addition, 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. Furthermore, a nozzle 52 is fixed outside the backflow prevention valve 50, and the flow velocity is increased by narrowing the diameter. This allows the accelerated liquid to 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. It may be provided on the side where the liquid is supplied. In addition, install an open / close adjustment valve on the piping side such as the discharge port 24 or the 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 pump 10 are configured to open and close by the vertical movement of the reciprocating rod 30. In the process of lifting 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 depressurized. As a result, the suction valve 28 is opened, and liquids such as water, 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, whereby the suction valve 28 is closed and the discharge valve 38 is opened. It is pumped up. At the beginning of startup, the reciprocating rod 30 is moved up and down several times, so that the liquid that has passed through the fitting 36 is pumped into the gap between the outer tube 20 and the reciprocating rod 30 and eventually the liquid is filled in the gap. To do.

[0027] When this state force also pushes down the reciprocating rod 30, the suction of the outer pipe 20 and the intake valve 28 are closed as shown in 02 (A), and the liquid filled between the piston 34 and the intake valve 28 is compressed. At the same time, 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 portion is formed small, the liquid moved to the gap portion 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 discharged 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.

[0028] Thereafter, when the reciprocating rod 30 is pulled upward, the suction valve 28 of the outer pipe 20 is opened because the space between the piston 34 and the suction valve 28 is reduced as shown in Fig. 2 (B). Thus, the liquid is sucked up from the suction valve 28, and the liquid is filled between the piston 34 and the suction valve 28. In addition, when the reciprocating rod 30 is pulled up, the liquid remaining in the gap is lifted up to the discharge port 24, and the backflow prevention valve 50 is slightly opened to discharge the discharge port 24 force as shown by the dotted line. As described above, by moving the reciprocating rod 30 up and down, the liquid can be pumped up and the pressurized liquid can be discharged from the discharge port 24.

[0029] 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. It was also confirmed that when the discharge pipe 51 was extended in the vertical direction, 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, it is necessary to increase the pressure of the liquid in order to discharge the liquid to high places or far away. The In this case, setting the ratio in the range of 0.6 to 0.95 makes it possible to reduce the volume of the gap and increase the pressure in the gap. In addition, when pumping water to a higher location, it is desirable to install one or more backflow prevention valves in the middle of the water discharge pipe 51 attached to the nozzle 52.

[0030] When the handle 33 of the pump 10 having the above-described constituent force is reciprocated up and down to reciprocate the reciprocating rod 30, the liquid given to the piston 34 and the discharge valve 38 as the liquid is sucked up from the suction port 23. Increases in weight. However, since the specific gravity of the reciprocating rod 30 is smaller than that of the liquid, buoyancy is generated when the reciprocating rod 30 is immersed in the liquid. Therefore, this buoyancy can reduce the lifting force of the handle 33 required for pumping.

[0031] Such a pumping 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 described above does not require priming water, and it is possible to pump up only by immersing the suction valve 28 in the liquid. Therefore, it can be used directly without any pre-preparation when it is carried to the place of use, and the liquid pumping operation can be speeded up.

Example 2

FIGS. 3 to 5 show an embodiment in which the seal in the outer tube is detachable. FIG. 3 shows the first embodiment. 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. Furthermore, the inner surface of 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. The screw portion of the cap 29 is screwed into the screw portion of the connecting member 22 so as to be connected. Further, a connecting member 32 having a threaded portion formed thereon is fitted to the upper end of the reciprocating bar 30, and a holding tool 34 to which a handle 33 is attached is screwed into the connecting member 32. With this configuration, the node 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 attached by attaching a handle 33 to the upper end of the reciprocating rod 30.

FIG. 4 shows a second embodiment. The difference from FIG. 3 resides in the connection structure between the outer tube 20 and the cap 29. That is, a screw part 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 a screw part is formed on the inner periphery of the cylindrical connecting member 22A. Then, the threaded portion of the connecting member 22A is screwed to the threaded portion of the outer tube 20 and the threaded portion of the cap 29 to be coupled together.

FIG. 5 shows a third embodiment. That is, the inner diameter of the upper end side of the outer tube 20 is greatly increased, and a thread portion is formed on the inner surface thereof. Further, 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.

[0035] 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 liquid to a higher location or farther away from the discharge port 24 of the pump 10, it is advantageous to attach the seal 27 and pressurize the interior of the pump 10. When discharging to a lower position, it is advantageous to remove the seal 27 so that no pressure is applied to the interior of the pump 10. Therefore, by attaching and detaching the seal 27 according to the purpose and situation of use, it is possible to easily use and divide according to the application even though it is the same pump.

Example 3

Next, another example 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 in the pump 10 so as not to be compressed at least in the axial direction of the pump 10 in a state where no pressure force S is applied. And a packing 27A that seals between the outer surface of the outer tube 20 and the inner surface of the upper end portion 21 provided integrally with the outer tube 20.

The knocking 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. With this configuration, it can withstand water pressure of at least 15kg It is confirmed that it can be watertight.

In more detail, as shown in FIG. 6, the packing 27 A has an inner diameter that is 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 smaller than the inner diameter of the joint 22B constituting a part of the outer pipe 20. The packing 27A is arranged inside the outer tube 20 so as not to be clamped from above and below by a solid member.

As a result, the packing 27A is movable 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 27A is not substantially compressed in either the axial direction of the pump 10 or the direction orthogonal to the axis of the pump 10 in a state where no pressure is applied in the pump 10. Arranged in!

Therefore, the structure is such that the liquid pressure can directly act on at least the lower surface and the outer peripheral surface of the knockin 27A. The lower surface and the outer peripheral surface of the packing 27A are surfaces that do not contact the inner surface of the upper end 21 and the outer surface of the reciprocating rod 30!

[0038] According to the seal described above, water-tightness is formed between the outer surface of the reciprocating rod 30 and the inner surface of the upper end portion 21, so that it is substantially between the reciprocating rod 30 and the outer tube 20. Is watertight. Here, the upper end portion 21 is a portion provided integrally with the outer tube 20 and is provided by a cap 29A in this embodiment. The inner end surface portion force of the cap 29A is the 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 to the outer tube 20 and is watertight through a seal tape. The other end of the joint 22B is connected by press-fitting a long pipe 20a. 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 that the joint 22B force is also inserted into the outer tube 20 over the tube material 20a, and the reciprocating rod 30 is inserted into the tube. The upper end flange 60a is provided so as to be locked to the stepped portion of the joint 22B, thereby restricting the arrangement position. According to this 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 able to contact the lower surface of the packing 27A, and acts to restrict deformation and movement of the packing 27A To do. [0039] According to the seal constituted by the packing 27A as described above, watertightness can be suitably ensured and the movement of the reciprocating rod 30 is not hindered. In particular, according to the two rubber flat packings 27a, 27a, the packing 27A can withstand higher pressure without obstructing the movement of the reciprocating bar 30. This is presumably because the packing 27A 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 that does not feel the sliding resistance (friction resistance) of the reciprocating rod 30 can be discharged from the discharge port 24 at a high pressure.

On the other hand, in the conventional sealing method using a sealing material such as an O-ring or a V-shaped knock, the reciprocating rod 30 may not move if watertightness is ensured. On the other hand, if the movement of the return rod 30 is secured, watertightness may not be achieved. For example, in the O-ring, the reciprocating rod 30 has a large sliding resistance from the initial stage because it is arranged in a compressed state in accordance with the maximum pressure even when the pressure is not applied in the pump. 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.

[0040] The pumping pump according to the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the present invention. For example, the discharge valve provided on the piston may be changed to a ball having a material force such as glass or metal in addition to the tongue-shaped valve. Needless to say, the length, outer diameter, and material of the outer pump, the extended outer pipe, the reciprocating bar, and the extended reciprocating bar of the pump are variously changed.

Industrial applicability

[0041] The present invention is applied to pumps for pumping water from wells, rivers, ponds, etc., or oil, chemicals, etc. Water supply to the upper floors of buildings such as houses and buildings, the bottom of the ship It can be used for wastewater.

Further, the seal structure that is effective in the present invention and the pump using the seal structure are not limited to liquid use, but can be used for gas that requires airtightness such as air. In other words, it can be used in fields where high sealing performance and low sliding resistance are required for reciprocating bar operation.

Claims

The scope of the claims

[1] A hollow-structured outer pipe having a suction port with a suction valve at the lower end side and a discharge port at the upper end side, and a discharge valve at the lower end that is reciprocally inserted into the outer pipe. A reciprocating rod to which a piston is attached, and 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,

2. A pump according to claim 1, wherein a seal is provided above the outlet of the outer tube to allow the reciprocating rod to move up and down and seal the upper end of the gap.

[2] The pump according to claim 1, wherein a backflow prevention valve for preventing backflow in the gap direction is provided at the discharge port.

[3] The reciprocating rod inserted into the outer tube is formed by a hollow pipe or a low specific gravity rod, and is configured to prevent the liquid from entering the reciprocating rod. The pump according to claim 1 or 2, wherein the specific gravity of the pump is smaller than that of the liquid.

[4] The pump according to claim 1, 2 or 3, 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.

[5] The seal is provided in an annular shape that is externally fitted to the reciprocating rod, and is arranged so as not to be compressed substantially at least in the axial direction of the pump without pressure in the pump. 5. The pump according to claim 1, 2, 3 or 4, wherein the pump is a knock that seals between an outer surface of the reciprocating rod and an inner surface of an upper end portion provided integrally with the outer tube. pump.

[6] The pump according to claim 1, 2, 3, 4 or 5, wherein the packing is composed of a plurality of flat packings stacked in a plurality of layers.