JP6661337B2 - Combined pump - Google Patents

Description

  The present invention relates to a combined pump having a hand pump and a submersible pump.

  At present, a technique using a submersible pump for deep wells to pump well water from deep wells is known. Such a submersible pump is arranged in deep well water and supplies well water. However, in a configuration in which well water is pumped using a submersible pump, the well water cannot be pumped during a power outage.

  Therefore, a technique of a tandem-type hand pump in which a submersible pump and a hand pump for a deep well are installed in the deep well is also known (for example, see Patent Document 1). This tandem-type hand-pump includes a composite pumping unit having a flow path for a submersible pump and a flow path for the hand-pump, and the outer diameter of the composite pumping unit is slightly smaller than the diameter of a casing pipe for a deep well. Therefore, it can be installed in deep wells.

Japanese Utility Model Registration No. 3178691

  The tandem hand pump described above has the following problems. That is, the configuration is such that the composite pumping unit slightly smaller in diameter than the diameter of the casing pipe for the deep well is provided with the respective flow paths of the submersible pump and the manual pump. For this reason, the configuration of the composite pumping unit becomes complicated.

  Further, since two flow paths coexist, the flow path cross-sectional area of each flow path is reduced, and as a result, there is a problem that flow path resistance increases. If the flow path resistance increases, the submersible pump or the hand-pump may not satisfy the required output.

  Therefore, an object of the present invention is to provide a composite pump having a hand pump and a submersible pump that can secure a desired flow path cross-sectional area.

  In order to solve the above problems and achieve the object, a composite pump of the present invention is configured as follows.

According to one aspect of the present invention, a composite pump includes a base installed in a deep well, a cylindrical cylinder installed in the deep well and connected to a lower end of the base, and a piston provided in the cylinder. Member, connected to the piston member, a piston rod provided over the base and the cylinder, an operation lever configured to be rotatable with respect to the base, and connecting the operation lever and the piston rod, A hand pump having a link mechanism for converting the rotation of the operating lever into reciprocating motion of the piston rod, a discharge casing connected to the lower end of the cylinder, connected to the cylinder, and connected to a primary side of the discharge casing pump unit being, and, and a water pump having a suction casing connected to the primary side of the pump unit, the hand The pump includes a first check valve provided at a lower end of the cylinder, and a second check valve provided at the piston member, and the submersible pump includes a submersible motor in which the suction casing is provided at an upper part. And a third check valve provided in the discharge casing .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the compound pump which has a hand-pump and a submersible pump which can ensure a desired flow path cross-sectional area.

FIG. 1 is an explanatory diagram schematically showing a configuration of a compound pump according to one embodiment of the present invention. Sectional drawing which shows a part of structure of the hand pump used for the compound pump. Sectional drawing which shows a part of structure of the hand pump. Sectional drawing which shows a part of structure of the hand pump. The side view which shows the structure of the submersible pump used for the same compound pump in partial cross section.

Hereinafter, a composite pump 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is an explanatory view schematically showing a configuration of a composite pump 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing a base 21 and a link mechanism 26 disposed on the ground of a hand pump 11 used in the composite pump 1. FIG. 3 is a sectional view showing the configuration of the connecting pipe 22 and the piston rod 25 arranged in the deep well 100 of the hand-pump 11, and FIG. 4 is arranged in the deep well 100 of the hand-pump 11. FIG. 5 is a cross-sectional view showing a configuration of the cylinder 23, the piston member 24, and the piston rod 25, and FIG. 5 is a side view showing a partial cross-section of the configuration of the submersible pump 12 used in the composite pump 1.

  As shown in FIGS. 1 to 5, the composite pump 1 includes a hand pump 11 installed in the deep well 100 and a submersible pump 12 connected in series to the primary side of the hand pump 11. The composite pump 1 is configured such that the well pump 110 and the submersible pump 12 can pump well water 110 of the deep well 100.

  The hand pump 11 includes a base 21, a connecting pipe 22 connected to a lower end of the base 21, a cylinder 23 connected to a lower end of the connecting pipe 22, and a piston member 24 reciprocally provided inside the cylinder 23. , A piston rod 25 connected to the piston member 24, a link mechanism 26 connected to the piston rod 25, and an operation lever 27 provided on the link mechanism 26.

  The base 21 is fixed so as to cover the opening of the deep well 100, for example, in a posture where the lower end faces the water surface. The base 21 has, at its upper end, an insertion hole 21a through which the piston rod 25 can be inserted, and a shaft sealing member 21b provided in the insertion hole 21a.

  The base 21 is formed in a cylindrical shape to which a connecting pipe 22 can be connected at a lower end. The base 21 has, for example, a discharge port 21c on the upper outer surface. The base 21 includes a support 21d that supports the link mechanism 26 on the upper outer surface on the side facing the discharge port 21c.

  The shaft sealing member 21b slidably supports the piston rod 25. The shaft sealing member 21b is formed so as to be able to support the radial load of the piston rod 25. The shaft sealing member 21b seals between the base 21 and the piston rod 25. The shaft sealing member 21b is formed of, for example, a resin material that does not affect water quality.

  The support 21d rotatably supports a part of the link mechanism 26.

  The connecting pipe 22 has one end connected to the lower end of the base 21 and the other end connected to the upper end of the cylinder 23. The connection pipe 22 fluidly connects the base 21 and the cylinder 23. The connecting pipe 22 arranges the piston rod 25 in the internal space and forms a flow path of well water from the cylinder 23 to the base 21 in the internal space. The connection pipe 22 is configured by connecting a plurality of pipes 22 a according to the depth of the deep well 100. The connecting pipe 22 has a regulating member 22b provided between the connected pipes 22a.

  The inner diameter of the plurality of pipes 22a is configured to be larger than the outer diameter of the piston rod 25 so that the flow path through which the well water passes has a predetermined flow path cross-sectional area.

  The restricting member 22b is formed in a cylindrical shape having substantially the same inner diameter as the pipe 22a, and has a plurality of protrusions 22c arranged on the inner peripheral surface thereof with a predetermined distance from the piston rod 25. The regulating member 22b is provided between the pipes 22a. When the piston rod 25 is inclined with respect to the axis of the pipe 22a, the regulating member 22b comes into contact with the piston rod 25, so that the radial deflection of the piston rod 25 can be regulated.

  The cylinder 23 is formed in a cylindrical shape whose axis extends along the vertical direction. The lower end of the cylinder 23 is connected to the submersible pump 12. The cylinder 23 is a lower end of the cylinder 23 and includes a first check valve 31 provided on the secondary side of the submersible pump 12 and a rainfall valve 32 provided on an upper end of the cylinder 23. .

  The cylinder 23 has a suction chamber 23 a inside the cylinder 23 and below the piston member 24, and has a discharge chamber 23 b inside the cylinder 23 and above the piston member 24.

  The inner peripheral surface of the cylinder 23 is configured so that the piston member 24 can slide. In the cylinder 23, the surface roughness of the inner peripheral surface and the degree of concentricity with respect to the axis are formed with predetermined accuracy. Here, the predetermined accuracy is an accuracy capable of preventing water leakage or the like between the piston member 24 and the cylinder 23 in the reciprocating motion of the piston member 24, and can be appropriately set according to the performance of the hand pump 11. is there.

  The first check valve 31 includes a first valve seat 31a provided at a lower end of the cylinder 23, a first valve body 31b abutting on the first valve seat 31a, and a first valve seat 31a and a first valve body 31b. And a first cover 31c for covering.

  The first valve seat 31a has an annular seating surface. The first valve body 31b is formed in a spherical shape formed of a resin material. The first valve element 31b is configured to be able to separate and contact with the first valve seat 31a.

  The first cover 31c covers the first valve seat 31a and the first valve body 31b with a predetermined gap from the first valve body 31b. The first cover 31c is formed in a frame shape that allows the water to pass through and connects the outer space and the inner space of the first cover 31c. The first cover 31c regulates the movement of the first valve body 31b when the first valve body 31b moves upward, as shown by a two-dot chain line in FIG.

  The rainfall valve 32 is provided at the upper end of the cylinder 23, and has a hole 32a that connects the upper end of the cylinder 23 to the outside, a valve body 32b that closes the hole 32a, and a valve body 32b that closes the hole 32a. And an operation wire 32d having one end fixed to the valve body 32b. The operation wire 32d is provided from the valve body 32b to the base 21 and is configured to be operable on the ground.

  Such a precipitation valve 32 allows the user to operate the operation wire 32d to separate the valve body 32b from the hole 32a, so that water in the flow path located above the hole 32a is externally discharged from the hole 32a. It is configured to be able to drain.

  The piston member 24 includes a piston yoke 41 connected to the lower end side of the piston rod 25, one or more piston seals 42 provided on the piston yoke 41 and formed to be slidable on the inner peripheral surface of the cylinder 23, A second check valve 43 provided on the piston yoke 41.

  The piston yoke 41 is formed, for example, in a cylindrical shape, and has the same number of seal grooves 41 a as the piston seals 42 in which the piston seals 42 are provided on the outer peripheral surface. Further, the piston yoke 41 has a connecting portion 41b connected to the piston rod 25. The connection portion 41b includes, for example, a plurality of plate-shaped protrusions 41c and a fixed portion 41d integrally connected to the plurality of protrusions 41c and fixed to the piston rod 25.

  The plurality of protrusions 41c are configured to be able to regulate the movement of a second valve body 42b, which will be described later, of the second check valve 43, and form a flow path of water between the adjacent protrusions 41c. The piston seal 42 is configured to be slidable on the inner peripheral surface of the cylinder 23.

  The second check valve 43 includes a second valve seat 43 a fixed to the inner peripheral surface of the piston yoke 41, a second valve body 43 b in contact with the second valve seat 43 a, and a plurality of protrusions 41 c of the piston yoke 41. And a second cover configured.

  The second valve seat 43a has an annular seat surface. The second valve seat 43 a is, for example, formed in a cylindrical shape having a seat surface, and is fixed to the piston yoke 41. The second valve body 43b is formed in a spherical shape formed of a resin material. The second valve body 43b is configured to be able to separate and contact with the second valve seat 43a. The second cover regulates the movement of the second valve body 43b by the plurality of projections 41c when the second valve body 43b moves upward.

  The piston rod 25 is formed in a columnar shape, and a fixed portion 41d provided on the piston yoke 41 of the piston member 24 is fixed to a lower end portion. The piston rod 25 is disposed over the cylinder 23, the connecting pipe 22, and the base 21, and extends outside the base 21 through the insertion hole 21 a of the base 21. The piston rod 25 includes, for example, a plurality of shafts 25a and one or a plurality of joints 25b connecting the shafts 25a.

  The link mechanism 26 includes a first link member 51, a second link member 52, and a connection shaft 53.

  Both ends of the first link member 51 in the longitudinal direction are connected to the support portion 21d and the second link member 52 by connection shafts 53, respectively. The first link member 51 is formed in a plate shape, and is supported by the support portion 21d so as to be rotatable around the connection shaft 53.

  The second link member 52 is connected to the upper end of the piston rod 25 and the first link member 51 by a connection shaft 53. The second link member 52 is formed in a plate shape, and is supported by the piston rod 25 and the first link member 51 so as to be rotatable with respect to the piston rod 25 and the first link member 51. The second link member 52 has the piston rod 25 connected to one end in the longitudinal direction, and the operation lever 27 fixed to the other end in the longitudinal direction. Further, the second link member 52 is connected to the first link member 51 at an intermediate portion thereof.

  The operation lever 27 is a rod-shaped member connected to the second link member 52 and formed to a predetermined length.

  The submersible pump 12 includes a submersible motor 61, a suction casing 62, a rotating shaft 63, a pump section 64, a discharge casing 65, a fixed band 66, and a power cable 67.

  The underwater motor 61 has a drive shaft 61a. The underwater motor 61 is connected to an external power supply via a power cable 67. The drive shaft 61a is connected to the rotary shaft 63 via, for example, a joint 61b.

  The suction casing 62 is provided above the submersible motor 61, and is arranged as the lowermost stage of the pump unit 64. The suction casing 62 is formed in a substantially cylindrical shape, and is fixed to a motor casing of the underwater motor 61 at a lower portion by bolts or the like. The suction casing 62 includes a suction port 62a provided on the outer peripheral surface thereof, and a strainer 62b that covers the suction port 62a. In the suction casing 62, the pump portion 64 is fixed to the upper end, and one of the fixing bands 66 is fixed.

  The rotating shaft 63 has, for example, one end connected to the drive shaft 61a of the submersible motor 61 via a joint 61b, the other end rotatably supported by the discharge casing 65, and housed in the suction casing 62 and the pump unit 64. .

  The pump portion 64 is fixed to an upper portion of the suction casing 62 and is formed so that the rotary shaft 63 can be housed therein. More specifically, the pump section 64 includes a plurality of impellers 64a fixed to the rotating shaft 63, and a plurality of intermediate casings 64b each accommodating the impeller 64a.

  The pump section 64 includes a liner ring provided between the impeller 64a and the intermediate casing 64b, and a bearing member provided between the rotating shaft 63 and the intermediate casing 64b.

  The impeller 64a is formed of stainless steel, resin, or the like, and includes a pair of disk-shaped shrouds and a plurality of blades provided between the pair of shrouds. In the impeller 64a, one of a pair of shrouds is fixed to the rotating shaft 63, and the other shroud forms a suction port.

  The plurality of intermediate casings 64b are stacked and integrally configured. The intermediate casing 64b is configured to allow the rotation shaft 63 to pass therethrough. The intermediate casing 64b is configured to be able to guide the fluid increased in pressure by the stored impeller 64a to the suction port of the impeller 64a on the secondary side.

  The discharge casing 65 includes, for example, a casing main body 71 to which the other of the fixed bands 66 is fixed, and a third check valve 72 provided in the casing main body 71. The casing body 71 has a lower end connected to the intermediate casing 64b and an upper end connected to the lower end of the cylinder 23 of the hand pump 11.

  The third check valve 72 is provided inside the casing body 71, a third valve seat 72 a provided inside the casing body 71, a third valve body 72 b contacting the third valve seat 72 a, and a third check valve 72. A third cover 72c that covers the valve seat 72a and the third valve body 72b.

  The third valve seat 72a has an annular seat surface. The third valve seat 72a is, for example, an annular protrusion provided in the casing body 71. The third valve body 72b is formed in a spherical shape formed of a resin material. The third valve body 72b is configured to be able to separate and contact with the third valve seat 72a. The third cover 72c is constituted by a plurality of projections provided in the casing main body 71. As shown by a two-dot chain line in FIG. 5, when the third valve body 72b moves upward, the third valve body 72b Regulate the movement of In addition, the third cover 72c forms a water flow path between the plurality of protrusions.

Next, the use of the composite pump 1 will be described.
Under normal conditions, the submersible pump 12 is driven to pump well water. Specifically, first, the underwater motor 61 is driven by the electric power supplied via the power cable 67 to rotate the impeller 64a. Thereby, the well water is sucked from the suction port 62a of the suction casing 62, and the pressure is increased by each impeller 64a. The well water moves the third valve body 72b of the third check valve 72 from the third valve seat 72a to the open state by moving the third valve body 72b away from the third valve seat 72a, and moves from the discharge casing 65 to the hand pump 11. The well water discharged from the discharge casing 65 causes the first valve body 31b of the first check valve 31 of the cylinder 23 of the hand pump 11 to be separated from the first valve seat 31a to be in an open state, and the second check valve The second valve body 43b of 43 is separated from the second valve seat 43a to be in an open state. Thereby, the well water sequentially moves through the cylinder 23, the connecting pipe 22 and the base 21, and is discharged from the discharge port 21c of the base 21.

  As described above, at normal times, the submersible pump 12 is driven, the pressure of the water sucked from the suction casing 62 is increased by the submersible pump 12, the water is discharged from the discharge casing 65, and the well water is secondarily passed through the manual pump 11. Water to the side.

  At the time of a power failure, the user operates the operation lever 27 to pump well water. Specifically, first, when air is present in the cylinder 23, so-called priming is performed to fill the cylinder 23 with water. Next, the user operates the operation lever 27 to reciprocate the piston member 24 in the vertical direction.

  When the operation lever 27 is located above and the piston member 24 is located on the bottom dead center side, the user operates the operation lever 27 and rotates the operation lever 27 downward.

  By this operation, the operation lever 27 rotates around the end of the first link member 51, and the piston rod 25 moves upward along the axial direction. As shown by a solid line in FIG. 24 moves to the top dead center side. When the piston member 24 moves toward the top dead center, the volume of the suction chamber 23a, which is the space below the piston member 24 in the cylinder 23, increases.

  Therefore, when the piston member 24 moves toward the top dead center and the volume of the suction chamber 23a increases, the pressure of the suction chamber 23a decreases. When the pressure on the primary side of the first check valve 31 is higher than the pressure in the suction chamber 23a, in other words, when the pressure in the suction chamber 23a becomes a negative pressure, as shown by a two-dot chain line in FIG. The body 31b moves upward to be in the open state, and water flows from the discharge casing 65 into the suction chamber 23a.

  At this time, as shown by the solid line in FIG. 5, the second check valve 43 is in a state where the second valve body 43b is in contact with the second valve seat 43a, that is, the second check valve 43 is in a closed state. The movement of water to 23b is regulated.

  Next, the user operates the operation lever 27 to rotate the operation lever 27 upward. When the operation lever 27 rotates upward, the second link member 52 rotates so that the end connected to the piston rod 25 moves downward about the connection shaft 53 connected to the first link member 51. As a result, the piston rod 25 moves downward. By the operation of the link mechanism 26, the piston member 24 moves to the bottom dead center side as shown by a two-dot chain line in FIG. When the piston member 24 moves to the bottom dead center side, the volume of the suction chamber 23a decreases, and the pressure in the suction chamber 23a increases.

  When the pressure in the suction chamber 23a is higher than the pressure in the discharge chamber 23b, in other words, when the pressure in the suction chamber 23a becomes higher than the atmospheric pressure, the second valve body 43b moves upward as shown in FIG. As a result, the second valve body 43b is separated from the second valve seat 43a, and is opened. Thereby, the well water in the suction chamber 23a flows into the discharge chamber 23b.

  Thus, the water in the suction chamber 23a moves to the discharge chamber 23b by the piston member 24 moving to the bottom dead center side. Thereafter, the user can reciprocate the operation lever 27 to reciprocate the piston member 24 and pump water.

  The well water sucked into the suction chamber 23a moves from the suction casing 62 of the submersible pump 12 through the pump section 64 and the discharge casing 65.

  As described above, at the time of a power failure, the hand pump 11 is operated to draw well water from the deep well 100 through the flow path passing through the submersible pump 12, pass through the inside of the hand pump 11, and supply water to the secondary side.

  According to the composite pump 1 configured as described above, the submersible pump 12 is connected to the primary side of the hand pump 11, and one water flow path that passes from the deep well 100 through the submersible pump 12 and the hand pump 11 is provided. The flow path can be shared by the hand pump 11 and the submersible pump 12. Accordingly, when the flow path is viewed by each of the hand pump 11 and the submersible pump 12, the composite pump 1 can increase the flow path resistance because the required flow path cross-sectional area can be secured by each of the pumps 11 and 12. I won't let you. In other words, it is possible to secure desired required diameters of the hand pump 11 and the submersible pump 12, and as a result, it is possible to secure a wide flow path cross-sectional area.

  Accordingly, it is not necessary to select the pumps 11 and 12 having a high output due to an increase in the flow path resistance, and it is not necessary to increase the diameter of the deep well 100. In other words, since there is no need to separately secure the flow path cross-sectional area of the flow path passing through each of the pumps 11 and 12, even if the hand pump 11 and the submersible pump 12 are combined, the composite pump 1 requires the required output. May be selected respectively.

  As a result, since no over-specification pump is selected, the manufacturing cost of the composite pump 1 and the running cost of the submersible pump 12 are not increased, and the diameter of the deep well 100 is reduced by the manual pump 11 and the submersible pump 12, respectively. It is sufficient if there is a diameter normally used, and there is no increase in manufacturing cost and installation cost.

  The submersible pump 12 has a third check valve 72, and the first non-return valve 31 and the second non-return valve 43 of the hand pump 11 are arranged on the secondary side of the submersible pump 12. For this reason, since the three check valves 31, 43, and 72 are disposed on the secondary side of the pump section 64 of the submersible pump 12, it is possible to prevent water from dropping when the submersible pump 12 stops. Becomes Further, even if the sealing function of any one of the check valves 31, 43, 72 is reduced due to aging or biting of sand or the like, water can be prevented by the other check valves 31, 43, 72.

  As described above, according to the composite pump 1 according to the present embodiment, by providing the manual pump 11 and the submersible pump 12 in series, it is possible to secure a desired flow path cross-sectional area and increase the flow path resistance. Can be prevented.

The present invention is not limited to the above embodiment. For example, the first check valve 31, the second check valve 43, and the third check valve 72 described above use a configuration in which the spherical first valve body 31b, second valve body 43b, and third valve body 72b are provided. However, the present invention is not limited to this. The first valve element 31b, the second valve element 43b, and the third valve element 72b have a configuration in which a flat valve element or a valve element of another shape is provided as long as the backflow of water in the flow path can be prevented. You may. In addition, various modifications can be made without departing from the spirit of the present invention.
Hereinafter, the description equivalent to the invention described in the claims of the present application is appended.
[1] A base installed in a deep well, a cylindrical cylinder installed in the deep well and connected to a lower end of the base, a piston member provided in the cylinder, connected to the piston member, A piston rod provided over the base and the cylinder, an operation lever configured to be rotatable with respect to the base, and connecting the operation lever and the piston rod, and rotating the operation lever by the piston rod A hand pump having a link mechanism for converting to a reciprocating motion of
Discharge casing connected to the lower end of the cylinder, a discharge casing connected to the cylinder, a pump unit connected to the primary side of the discharge casing, and a submersible pump having a suction casing connected to the primary side of the pump unit,
A composite pump comprising:
[2] The hand pump includes a first check valve provided on a lower end of the cylinder, and a second check valve provided on the piston member.
The composite pump according to [1], wherein the submersible pump has a third check valve in the discharge casing.
[3] The composite pump according to [1], wherein the hand-pump further includes a connecting pipe connecting the base and the cylinder between the base and the cylinder.
[4] The connection pipe includes a plurality of pipes, and a cylindrical regulating member provided between the plurality of pipes and having a predetermined gap with the piston rod and projecting from an inner peripheral surface. The composite pump according to [3], wherein:
[5] The composite pump according to [1], wherein the hand-pump includes a precipitation device provided at an upper end of the cylinder.

  DESCRIPTION OF SYMBOLS 1 ... Composite pump, 11 ... Hand-pump, 12 ... Submersible pump, 14 ... Operating lever, 21 ... Base, 21a ... Insertion hole, 21b ... Shaft sealing member, 21c ... Discharge port, 21d ... Support part, 22 ... Connecting pipe, Reference numeral 22a: piping, 22b: regulating member, 22c: projection, 23: cylinder, 23a: suction chamber, 23b: discharge chamber, 24: piston member, 25: piston rod, 25a: shaft body, 25b: coupling, 26: link mechanism Part, 27 ... operating lever, 31 ... first check valve, 31a ... first valve seat, 31b ... first valve body, 31c ... first cover, 32 ... precipitation valve, 32a ... hole, 32b ... valve body, 32c: urging member, 32d: operating wire, 41: piston yoke, 41a: seal groove, 41b: connecting portion, 41c: projection, 41d: fixing portion, 42: piston seal, 42b: second valve body, 43: reverse Stop valve, 43 ... 2 Check valve, 43a: second valve seat, 43b: second valve element, 51: first link member, 52: second link member, 53: connecting shaft, 61: submersible motor, 61a: drive shaft, 61b ... Joint, 62: suction casing, 62a: suction port, 62b: strainer, 63: rotary shaft, 64: pump unit, 64a: impeller, 64b: intermediate casing, 65: discharge casing, 66: fixed band, 67: power cable, 71: casing body, 72: third check valve, 72: check valve, 72a: third valve seat, 72b: third valve body, 72c: third cover, 100: deep well, 110: well water.

Claims (4)

A base installed in a deep well, a cylindrical cylinder installed in the deep well, connected to a lower end of the base, a piston member provided in the cylinder, connected to the piston member, the base and the A piston rod provided in a cylinder, an operation lever configured to be rotatable with respect to the base portion, and connecting the operation lever and the piston rod, and rotating the operation lever to reciprocate the piston rod. A hand pump having a link mechanism for converting to
Discharge casing connected to the lower end of the cylinder, a discharge casing connected to the cylinder, a pump unit connected to the primary side of the discharge casing, and a submersible pump having a suction casing connected to the primary side of the pump unit,
Equipped with a,
The hand pump includes a first check valve provided at a lower end of the cylinder, and a second check valve provided at the piston member.
The composite pump according to claim 1, wherein the submersible pump includes a submersible motor in which the suction casing is provided at an upper part, and a third check valve provided in the discharge casing .   The composite pump according to claim 1, wherein the hand-pump further includes a connecting pipe connecting the base and the cylinder between the base and the cylinder. The connection pipe includes a plurality of pipes, and a cylindrical regulating member provided between the plurality of pipes and having a predetermined gap with the piston rod and projecting from an inner peripheral surface. 3. The composite pump according to claim 2 , wherein:   The compound pump according to claim 1, wherein the hand pump includes a precipitation device provided at an upper end of the cylinder.