JP6425914B2 - Hand pump - Google Patents

Description

  The present invention relates to a hand pump used to supply a liquid.

  At present, manual pumps are used to supply water from household wells and water reservoirs. In such a manual pump, there is known a technique in which a piston and two valve bodies are provided in a cylinder provided with a suction casing at one end and a discharge casing at the other end.

  Further, as a manual pump, there is known a technique of providing a link mechanism for reciprocating the piston via a piston rod provided on the piston and an operation lever for driving the link mechanism (see, for example, Patent Document 1). In the hand pump, the discharge casing is provided with a shaft seal member, and the space between the piston rod and the discharge casing is sealed. Further, the hand pump is formed by the link mechanism so as to be able to convert the vertical rotation of the operation lever into the vertical reciprocating motion of the piston rod.

  In such a manual pump, a discharge chamber and a suction chamber are formed by a piston and a cylinder. The hand pump reciprocates the piston to vary the volume of the suction chamber and alternately opens and closes the two valve bodies to suck in water from the primary side of the suction chamber and to secondary side the water of the suction chamber The water in the discharge chamber is discharged to the outside.

JP, 2009-013876, A

  The hand pump using the above-described bearing member has the following problems. That is, when air is present in the suction chamber at the time of use of the manual pump, first, the control lever is driven to reciprocate the piston so that the suction chamber is filled with water, so-called self-priming.

  At this time, when the piston moves in the direction in which the volume of the suction chamber increases, the air in the suction chamber expands and becomes negative pressure. Therefore, when the piston moves to the top dead center side, the negative pressure in the suction chamber moves the piston to the bottom dead center side, which may cause the control lever to pivot upward. In particular, since the pressure drop in the suction chamber increases as the moving speed of the piston increases, when the operating lever is operated rapidly, there is a possibility that so-called splashing may occur where the operating lever is rapidly pivoted upward.

  Then, an object of this invention is to provide the hand pump which can prevent the jumping of an operation lever.

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

According to one aspect of the present invention, the hand pump includes a cylindrical cylinder whose axial center is disposed along the vertical direction, a suction casing provided at the lower end of the cylinder and constituting the cylinder and the suction chamber, A main body having a discharge casing provided at an upper end portion of the cylinder and constituting the cylinder and a discharge chamber, and reciprocably formed on an inner peripheral surface of the cylinder, the suction chamber and the discharge being formed in the cylinder A piston portion divided into a chamber, a piston rod connected to the piston portion, an operation lever formed rotatably, the operation lever and the piston rod are connected, and the rotation of the operation lever is performed by the piston a linkage mechanism for converting the reciprocating motion of the rod, is provided in the cylinder, and a suction member capable introducing air into said suction chamber, said suction member, before It is connected to a first connection pipe provided in a cylinder, a second connection pipe provided in the discharge casing, and the first connection pipe and the second connection pipe, and the flow of air from the discharge casing to the cylinder It has a piping part which constitutes a passage, and an orifice provided in the flow passage.
Further, according to one aspect of the present invention, the hand pump is a cylindrical cylinder whose axial center is disposed along the vertical direction, a suction casing which is provided at a lower end of the cylinder and which constitutes the cylinder and a suction chamber. And a main body having a discharge casing provided at an upper end portion of the cylinder and constituting the cylinder and a discharge chamber, and reciprocably formed on an inner peripheral surface of the cylinder, the inside of the cylinder being the suction chamber and A piston portion divided into the discharge chamber, a piston rod connected to the piston portion, an operation lever rotatably formed, the operation lever and the piston rod are connected, and the operation lever is rotated. It comprises: a link mechanism portion for converting into a reciprocating motion of the piston rod; and an intake member provided in the cylinder and capable of introducing air into the suction chamber, the intake member A first on-off valve comprising: an outer body connected to the cylinder and having a seat surface; a valve body provided in the outer body; and a spring biasing the valve body to the seat surface, When the pressure in the suction chamber is lower than the atmospheric pressure, the valve body moves against the spring.

  According to the present invention, it is possible to provide a hand pump which can prevent the operation lever from jumping up.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the hand pump which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the structure of the hand pump which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the structure of the hand pump which concerns on the 3rd Embodiment of this invention. Sectional drawing which shows the structure of the hand-pushing pump which concerns on the 4th Embodiment of this invention.

First Embodiment
Hereinafter, the hand pump 1 according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a cross-sectional view showing the configuration of a hand-held pump 1 according to a first embodiment of the present invention.

  As shown in FIG. 1, the hand pump 1 includes a body 11, a piston member 12 reciprocally provided inside the body 11, a link mechanism portion 13 connected to the piston member 12, and a link mechanism portion 13. And an operation lever 14 provided on the The hand pump 1 has a pumping function by reciprocating movement of the piston member 12 and a precipitation function by a first projection 25 b and a second projection 26 b described later.

  The main body 11 is disposed in a well or the like, for example, so that the lower end portion faces the water surface. The main body 11 has a cylindrical cylinder 21 whose axial center extends along the vertical direction, a suction casing 22 connected to the lower end of the cylinder 21, and a discharge casing 23 connected to the upper end of the cylinder 21. , And a base 24 provided at the lower end of the suction casing 22.

  The main body 11 includes a first check valve 25 provided in the suction casing 22, a cover member 26 provided between the cylinder 21 and the suction casing 22, and an intake member 27 provided in the cylinder 21. .

  The main body 11 has flanges at opposing ends of the cylinder 21 and the suction casing 22 and opposing ends of the cylinder 21 and the discharge casing 23, respectively, and the flange having sealing members interposed therein is a bolt or the like. The cylinder 21, the suction casing 22, and the discharge casing 23 are integrally configured by fastening by the fastening member.

  In the main body 11 as described above, the suction chamber 11 a is formed in the cylinder 21 and the suction casing 22 together with the piston member 12. In the main body 11, together with the piston member 12, the discharge chamber 11 b is formed in the cylinder 21 and the discharge casing 23.

  The cylinder 21 is formed such that the piston member 12 can slide on the inner peripheral surface thereof. The cylinder 21 is formed with the surface roughness of the inner peripheral surface and the circularity to the axial center with a predetermined accuracy. Here, the predetermined accuracy means the leakage of water between the piston member 12 and the cylinder 21 in the reciprocation of the piston member 12, the resistance and interference between the piston member 12 and the cylinder 21 at the time of reciprocation, or the piston The accuracy is such that deterioration of the pump function due to damage of the member 12 or the like can be prevented, and can be appropriately set according to the performance of the hand pump 1.

  The suction casing 22 is formed in a bowl shape, has an upper end opened with the same inner diameter as the cylinder 21, and is provided with a suction port 22a at the lower end. The suction casing 22 is formed so that the first check valve 25 can be disposed therein. Specifically, the suction casing 22 can arrange the first check valve 25 on the inner surface around the suction port 22a, and a plurality of ribs 22b for guiding the movement of the first check valve 25, and the suction port And a first valve seat 22c formed around the periphery 22a.

  The suction casing 22 constitutes a first valve chamber 22d of a first check valve 25 having a first valve seat 22c by the space between the ribs 22b. For example, a screw portion 22e is formed on the inner peripheral surface of the suction port 22a such that a hose disposed in water can be connected. The suction port 22a communicates with the first valve chamber 22d.

  The discharge casing 23 is formed in a bowl shape whose lower end is opened at the same inner diameter as the cylinder 21. The discharge casing 23 has a discharge port 23a formed in a part of the side surface, a hole 23b provided in the upper end of the discharge casing 23, a shaft seal member 23c provided in the hole 23b, and the discharge casing 23 A support portion 23d provided on the outer surface and a restriction member 23e provided on the outer surface of the discharge casing 23 are provided.

  The hole 23 b is formed so that a piston rod 41 (described later) of the piston member 12 can be inserted and the shaft sealing member 23 c can be disposed. In addition, the hole 23b includes a lid 23f that fixes the shaft sealing member 23c and supports the regulating member 23e.

  The shaft seal member 23 c slidably supports the piston rod 41. Further, the shaft sealing member 23 c is formed so as to be able to support the load of the piston rod 41 in the radial direction. The shaft seal member 23 c seals the space between the discharge casing 23 and the piston rod 41 by being interposed between the discharge casing 23 and the piston rod 41. The shaft sealing member 23c is made of, for example, a resin material that does not affect the water quality.

  The support 23 d is formed to be able to support a part of the link mechanism 13.

  The restriction member 23 e is formed of a resin material in an annular shape, and is formed detachably on the piston rod 41. The regulating member 23e is supported by the lid 23f in a state in which the piston rod 41 is inserted. The restricting member 23 e is supported by the lid 23 f and is formed to be able to abut on a connecting portion 43 of the piston member 12 described later.

  The restricting member 23 e is formed so as to restrict the movement of the piston rod 41 by coming into contact with the connecting portion 43. The restricting member 23e has a length in the axial direction, for example, a length capable of restricting the movement of the piston rod 41 before the piston member 12 reaches the bottom dead center.

  The base portion 24 is fixed to or integrally formed with the suction casing 22 and is formed so as to be fixed to an installation portion of the hand-operated pump 1 such as a well.

  The first check valve 25 protrudes obliquely upward from the first valve body 25 a in contact with the first valve seat 22 c and the approximate center of the surface of the first valve body 25 a facing the piston member 12. And a first protrusion 25b from which the tip projects. The first check valve 25 is provided in the first valve chamber 22d, and is formed to be able to abut on the first valve seat 22c.

  The cover member 26 is formed in a disk shape. The cover member 26 forms a water flow path, and has a plurality of holes 26a in which the first projection 25b can be disposed in a part thereof, and a second provided substantially in the center of the surface facing the piston member 12 And a protrusion 26b. The cover member 26 is provided between the cylinder 21 and the suction casing 22.

  The intake member 27 is formed to be capable of introducing air into the suction chamber 11a. The intake member 27 includes a first connection pipe 31 provided in the cylinder 21, a second connection pipe 32 provided in the discharge casing 23, and a piping portion 33 connected to the first connection pipe 31 and the second connection pipe 32. And an opening / closing valve 34 provided in the first connection pipe 31 and an orifice 35 provided in the second connection pipe 32. The intake member 27 forms a flow path of air for moving the air in the discharge chamber 11b into the suction chamber 11a.

  The first connection pipe 31 is a piston member in the middle of the cylinder 21, specifically, between the top dead center and the bottom dead center of the piston member 12, and the pressure in the suction chamber 11 a is negative. It is provided on the top dead center side of the 12 positions. If the pressure in piston member 12 is a negative pressure and the first check valve 25 is open on the top dead center side of the first connection pipe 31 relative to the position of the piston member 12, the shape of the manual pump 1 The position can be set appropriately according to the performance and the like.

  The pipe portion 33 is a pipe formed of a metal material, or a flexible hose or tube formed of a resin material. The on-off valve 34 is formed to be able to open and close an air flow path. The on-off valve 34 is formed to be able to open and close the flow path manually. The orifice 35 is a throttle that reduces the diameter of the air flow path.

  The piston member 12 includes a piston rod 41, a piston portion 42 connected to the lower end side of the piston rod 41, and a connecting portion 43 provided on the upper end side of the piston rod 41.

  The piston rod 41 is formed in a cylindrical rod shape, and the piston portion 42 is fixed to the lower end portion. The surface roughness of a portion of the piston rod 41 which slides on at least the shaft seal member 23c on the outer peripheral surface thereof is formed with a predetermined accuracy. The piston rod 41 is extended from the discharge chamber 11 b to the outside of the main body 11 through the hole 23 b and the shaft seal member 23 c.

  The piston portion 42 is provided on the piston yoke 45 connected to the lower end side of the piston rod 41, and the piston yoke 45, and the piston 46 formed slidably on the inner peripheral surface of the cylinder 21 and the piston 46 A piston presser 47 fixed to 45 and a second check valve 48 provided on the piston presser 47 are provided.

  The piston yokes 45 are branched and extended, for example, in a plurality of directions, for example, in four directions, at an arrangement having a constant interval around the piston rod 41, for example.

  The piston 46 is formed of, for example, a resin material such as rubber and is formed so as to be elastically deformable. The piston 46 is formed in a bowl shape whose upper portion is open, and a portion of the lower portion is opened. The piston 46 divides the inside of the cylinder 21 in a fluid-tight manner, and is formed slidably on the inner circumferential surface of the cylinder 21. The piston 46 is formed so that the inside of the cylinder 21 can be divided into a suction chamber 11 a and a discharge chamber 11 b.

  The piston presser 47 supports the piston 46 and clamps the piston 46 with the piston yoke 45 to fix the piston 46 to the piston rod 41. The piston presser 47 is formed at a central portion, and includes an opening 47a having a diameter smaller than that of the piston 46, and a second valve seat 47b formed on a surface around the opening 47a facing the discharge casing 23. ing.

  The piston presser 47 is formed to be able to communicate the suction chamber 11a and the discharge chamber 11b by the opening 47a. The piston presser 47 is formed so as to be able to abut on the end of the first projection 25 b of the first check valve 25. The piston yoke 45 and the piston presser 47 constitute a second valve chamber 42a having a second valve seat 47b in the opposing space.

  The second check valve 48 is provided in the second valve chamber 42a, and is formed to be able to abut on the second valve seat 47b. The second check valve 48 is formed to be able to abut on the second projection 26 b of the cover member 26.

  The connecting portion 43 is formed to be connectable with the link mechanism portion 13. The connecting portion 43 is fixed to the end of the piston rod 41. The connecting portion 43 is formed such that the outer diameter is larger than the outer diameter of the piston rod 41, and is formed to be able to abut on the regulating member 23e.

  The link mechanism unit 13 includes a first link member 51 and a second link member 52.

  Both ends of the first link member 51 in the longitudinal direction are connected to the support portion 23 d and the second link member 52 by the connecting shaft 13 a. The first link member 51 is formed in a plate shape, and is supported by the support portion 23 d so as to be rotatable about the connecting shaft 13 a.

  The second link member 52 is coupled to the coupling portion 43 and the first link member 51 by the coupling shaft 13 a. The second link member 52 is formed in a plate shape, and is supported by the connecting portion 43 and the first link member 51 so as to be rotatable with respect to the connecting portion 43 and the first link member 51. In the second link member 52, the connecting portion 43 is connected to one end in the longitudinal direction, and the operation lever 14 is connected to the other end in the longitudinal direction. Further, the first link member 51 is connected to the middle of the second link member 52.

  The operation lever 14 is a rod-like member connected to an end of the second link member 52 and formed to have a predetermined length. The length of the control lever 14 can be appropriately set according to the installation location and performance of the hand pump 1, as long as the user can reciprocate the piston member 12.

Next, an operation in the case of pumping water from a water source, for example, a well or the like using the hand pump 1 will be described.
At the start of use of the hand pump 1, since air is present in the suction chamber 11a, first, so-called self-priming is performed to fill the suction chamber 11a with water. The user operates the on-off valve 34 of the intake member 27 to open the on-off valve 34, thereby communicating the suction chamber 11a with the discharge chamber 11b. Next, the user operates the operation lever 14 to reciprocate the piston member 12. Specifically, when the operation lever 14 is positioned upward and the piston member 12 is positioned on the bottom dead center side, the user operates the operation lever 14 to turn the end of the operation lever 14 downward. Move it.

  By this operation, the operation lever 14 pivots about the end of the first link member 51, and the connecting portion 43 moves upward. Thus, the piston rod 41 moves upward along the axial direction, and the piston portion 42 moves to the top dead center side. When the piston portion 42 moves toward the top dead center, the volume of the suction chamber 11 a formed by the piston portion 42, the cylinder 21, the suction casing 22, the first check valve 25 and the second check valve 48 increases. .

  At this time, the suction port 22 a is closed by the first check valve 25, and the opening 47 a is closed by the second check valve 48. For this reason, when the piston part 42 moves to the top dead center side and the volume of the suction chamber 11a increases, the pressure of the suction chamber 11a decreases. When the pressure on the primary side of the first check valve 25 becomes higher than the pressure in the suction chamber 11a, in other words, when the pressure in the suction chamber 11a becomes negative pressure, the first check valve 25 moves upward and opens The suction port 22a is opened. Thus, water flows into the suction chamber 11a.

  When the piston portion 42 further moves and the first connection pipe 31 is positioned in the suction chamber 11a, the air in the discharge chamber 11b moves into the suction chamber 11a. This prevents the pressure in the suction chamber 11a from decreasing further.

  Thus, water is pumped into the suction chamber 11a until the piston portion 42 moves to the top dead center. At this time, the second check valve 48 is in contact with the second valve seat 47 b, that is, the second check valve 48 closes the opening 47 a of the piston presser 47. For this reason, the movement of water or air to the discharge chamber 11b is restricted.

  Next, the user operates the operation lever 14 to pivot the operation lever 14 upward. When the operation lever 14 pivots upward, the second link member 52 rotates so that the connecting shaft 13a connected to the connecting portion 43 moves downward around the connecting shaft 13a connected to the first link member 51. As a result, the piston rod 41 moves downward.

  As the piston rod 41 moves downward, the piston portion 42 moves to the bottom dead center side. When the piston portion 42 moves to the bottom dead center side, the volume of the suction chamber 11a decreases and the pressure in the suction chamber 11a increases. When the pressure in the suction chamber 11a becomes higher than the pressure in the discharge chamber 11b, in other words, when the pressure in the suction chamber 11a becomes higher than the atmospheric pressure, the second check valve 48 moves upward and becomes open. The opening 47a opens. Thus, the air and water in the suction chamber 11a flow into the discharge chamber 11b. When the piston portion 42 further moves to the bottom dead center side, the connecting portion 43 abuts on the regulating member 23 e before the piston portion 42 reaches the bottom dead center, and the movement of the piston portion 42 is regulated.

  As described above, when the piston portion 42 moves to the bottom dead center side, the water is pumped up to the discharge chamber 11b, and the air in the suction chamber 11a is moved to the discharge chamber 11b. The user repeatedly pivots the operation lever 14 until the suction chamber 11a is filled with water.

  Next, when the suction chamber 11a is filled with water, the user operates the on-off valve 34 to close the on-off valve 34. This completes self-priming. Thereafter, similarly, the user can reciprocate the piston portion 42 to pump water by reciprocating the operation lever 14.

Next, an operation of causing water accumulated in the suction chamber 11a and the discharge chamber 11b to be precipitated by the precipitation function after using the hand pump 1 will be described.
When the water in the main body 11 is allowed to precipitate after completion of the pumping by the hand pump 1, first, the regulating member 23e is removed from the lid 23f and the piston rod 41. Next, the control lever 14 is pivoted upward. At this time, the control lever 14 is rotated until the connecting portion 43 abuts on the lid 23 f and the movement of the control lever 14 is restricted.

  By the rotation of the operation lever 14, the piston portion 42 moves to the bottom dead center, and the lower surface of the piston presser 47, the first projection 25 b of the first check valve 25, and the second projection of the cover member 26. The lower surfaces of the 26 b and the second check valve 48 respectively abut.

  When the first protrusion 25 b of the first check valve 25 is pressed by the piston presser 47, the first protrusion 25 b is pressed downward at a position eccentric to the center of the first check valve 25. Thereby, the first check valve 25 is forcibly opened by separating the first valve body 25 a from the first valve seat 22 c except for a part of the lower surface thereof. The suction port 22a communicates with the suction chamber 11a.

  Similarly, when the lower surface of the second check valve 48 is pressed by the second projection 26 b, the second check valve 48 is separated from the second valve seat 47 b, and the second check valve 48 is forcibly opened. The suction chamber 11a communicates with the discharge chamber 11b.

  Thus, by forcibly opening each of the first check valve 25 and the second check valve 48, the space from the suction port 22a to the discharge chamber 11b becomes one continuous space, and the water accumulated in the main body 11 Will rain.

  After the end of the precipitation, the control lever 14 is operated to move the piston portion 42 from the bottom dead center to the top dead center, and the restriction member 23e is provided on the piston rod 41 and disposed on the lid 23f. As a result, the first check valve 25 and the second check valve 48 are closed, and a standby state in which the hand pump 1 can be used next time is established.

  According to the manual pump 1 having such a configuration, by providing the suction member 27 in the suction chamber 11a, when air is present in the suction chamber 11a at the time of self-suction, the volume in the suction chamber 11a increases and Even if the pressure is increased, the pressure in the suction chamber 11a does not extremely decrease. That is, since air is sucked into the suction chamber 11a by the suction member 27, the pressure in the suction chamber 11a is further reduced from the pressure at which the first check valve 25 opens even if the volume in the suction chamber 11a increases. Can be prevented.

  In particular, there is a possibility that the pressure in the suction chamber 11a may drop sharply as the moving speed of the piston portion 42 is faster, but the suction member 27 can prevent the rapid drop in the pressure in the suction chamber 11a. Become. Further, by providing the orifice 35 on the air flow path, the air flow path is narrowed, so that it is possible to prevent the pressure in the suction chamber 11a from rising rapidly and becoming the atmospheric pressure, and the inside of the suction chamber 11a Can maintain a negative pressure that can open the first check valve 25.

  Therefore, it is possible to prevent the piston portion 42 from moving rapidly to the bottom dead center side, and it is possible to prevent the operating lever 14 from jumping up even if the operating lever 14 is rapidly rotated. Since the jumping of the operation lever 14 can be prevented, the safety at the time of operation is enhanced. In addition, since a drastic drop in the pressure in the suction chamber 11a can be prevented, the force required to move the piston portion 42 to the top dead center side by rotating the operation lever 14 does not increase, and the operability is improved. Improve. Further, the length of the operation lever 14 can be shortened, and the hand pump 1 can be miniaturized.

  Further, since the intake member 27 has the open / close valve 34, it is possible to prevent air from being introduced from the discharge chamber 11b into the suction chamber 11a via the intake member 27 after the self-supply is completed.

  Furthermore, the intake member 27 is configured to connect the second connection pipe 32 to the discharge casing 23 so that the piston portion 42 moves to the bottom dead center side, and the water in the suction chamber 11a increases in pressure. Can flow into the discharge casing 23. For this reason, it is not necessary to separately provide a drain, a pipe, or the like for draining water that has flowed into the intake member 27, and the manufacturing cost and the installation cost can be reduced.

  As described above, according to the hand pump 1 according to the present embodiment, the air is introduced into the suction chamber 11a by the suction member 27 to prevent a sharp drop in the pressure in the suction chamber 11a, and the operation lever It becomes possible to prevent the jump of 14.

Second Embodiment
Next, a manual pump 1A according to a second embodiment of the present invention will be described with reference to FIG. In the hand pump 1A according to the second embodiment, the same components as those of the hand pump 1 according to the first embodiment described above are designated by the same reference numerals, and the detailed description thereof will be omitted.
FIG. 2 is a cross-sectional view showing the configuration of a hand-held pump 1A according to a second embodiment of the present invention.

  The hand pump 1A includes a main body 11A, a piston member 12 reciprocally provided inside the main body 11A, a link mechanism 13, and an operation lever 14.

  The main body 11A is disposed in a well or the like, for example, so that the lower end portion faces the water surface. The main body 11A includes a cylinder 21, a suction casing 22, a discharge casing 23, a base 24, a first check valve 25, a cover member 26, and an intake member 27A provided in the cylinder 21. .

  The intake member 27A is an intake and exhaust valve. The intake member 27A is located in the middle of the cylinder 21, specifically between the top dead center and the bottom dead center of the piston member 12, and the pressure in the suction chamber 11a is negative. It is provided on the top dead center side of the position. The intake member 27A is configured to be capable of sucking outside air into the suction chamber 11a when the pressure in the suction chamber 11a becomes lower than a predetermined pressure, that is, the pressure at which the first check valve 25 opens.

  According to the hand pump 1A configured in this manner, similar to the hand pump 1 described above, the air is introduced into the suction chamber 11a by the suction member 27A, thereby preventing a sharp drop in the pressure in the suction chamber 11a. Thus, it is possible to prevent the operation lever 14 from jumping up.

Third Embodiment
Next, a hand pump 1B according to a third embodiment of the present invention will be described with reference to FIG. In the hand pump 1B according to the third embodiment, the same components as those of the hand pump 1 according to the first embodiment described above are designated by the same reference numerals, and the detailed description thereof will be omitted.
FIG. 3 is a cross-sectional view showing the configuration of a hand-held pump 1B according to a third embodiment of the present invention.

  The hand pump 1B includes a main body 11B, a piston member 12 reciprocally provided inside the main body 11B, a link mechanism portion 13, and an operation lever 14.

  The main body 11B is disposed in a well or the like, for example, such that the lower end portion faces the water surface. The main body 11B includes a cylinder 21, a suction casing 22, a discharge casing 23, a base 24, a first check valve 25, a cover member 26, and an intake member 27B provided in the cylinder 21. .

  The intake member 27B is an intake valve. The intake member 27B is located in the middle of the cylinder 21, specifically between the top dead center and the bottom dead center of the piston member 12, and the pressure in the suction chamber 11a is negative. It is provided on the top dead center side of the position.

  The intake member 27 </ b> B includes a connection pipe 31, a first on-off valve 36 provided on the connection pipe 31, and a second on-off valve 37.

  The first on-off valve 36 includes a cylindrical outer shell 36a, a ball-like valve 36b provided in the outer shell 36a, and a spring 36c for biasing the valve 36b.

  The outer shell 36a is connected at one end to the connection pipe 31 and has a seat at the other end. The valve body 36b is formed to be able to abut on the seat of the shell 36a when the pressure in the suction chamber 11a is equal to or higher than the atmospheric pressure. Further, the valve body 36 b is formed of a material that floats in water.

  The spring 36c is a coil spring formed with a predetermined spring force. The spring 36c is formed to be able to bias the valve body 36b toward the seat of the shell 36a. Here, the predetermined spring force of the spring 36c means that the pressure in the suction chamber 11a is lower than the atmospheric pressure and the valve 36b is larger when the pressure is lower than the pressure at which the first check valve 25 is opened. It is a spring force compressed by being pressed by air pressure. Such a first on-off valve 36 is a check valve that opens when the atmospheric pressure and the pressure in the suction chamber 11a are a predetermined pressure difference.

  The second on-off valve 37 includes a cylindrical outer shell 37a and a ball-shaped valve 37b provided in the outer shell 36a. One of the shell 37a is connected to the first on-off valve 36, and a seat is formed on the other. Such a second on-off valve 37 can prevent water from leaking outside when the pressure in the suction chamber 11a is higher than the atmospheric pressure and water leaks from the first on-off valve 36. Is formed.

  Such an intake member 27B is configured such that the first pressure in the suction chamber 11a is lower than atmospheric pressure, ie, lower than the pressure at which the first check valve 25 is opened. The on-off valve 36 and the second on-off valve 37 are opened, and outside air can be drawn into the suction chamber 11a.

  According to the hand pump 1B configured in this manner, similar to the hand pump 1 described above, the air is introduced into the suction chamber 11a by the suction member 27B, thereby preventing a sharp drop in the pressure in the suction chamber 11a. Thus, it is possible to prevent the operation lever 14 from jumping up.

Fourth Embodiment
Next, a manual pump 1C according to a fourth embodiment of the present invention will be described with reference to FIG. In the hand pump 1C according to the fourth embodiment, the same components as those of the hand pump 1 according to the first embodiment described above are designated by the same reference numerals, and the detailed description thereof will be omitted.
FIG. 4 is a cross-sectional view showing the configuration of a hand-held pump 1C according to a fourth embodiment of the present invention.

  The hand pump 1 </ b> C includes a main body 11 </ b> C, a piston member 12 reciprocally provided inside the main body 11 </ b> C, a link mechanism 13, and an operation lever 14.

  The main body 11C is disposed in a well or the like, for example, so that the lower end portion faces the water surface. The main body 11C includes a cylinder 21, a suction casing 22, a discharge casing 23, a base 24, a first check valve 25, a cover member 26, and an intake member 27C provided on the cylinder 21 and the discharge casing 23. Is equipped.

  The intake member 27 </ b> C is a flow passage 38 provided in the cylinder 21 and the discharge casing 23 and making the suction chamber 11 a and the discharge chamber 11 b continuous. For example, the intake member 27C is formed when forming the cylinder 21 and the discharge casing 23 by casting.

  The flow path 38 is a piston member, one end of which is at a middle portion of the cylinder 21, specifically between the top dead center and the bottom dead center of the piston member 12, and the pressure in the suction chamber 11a is negative. It is connected to the top dead center side than the 12 positions. The other end of the flow path 38 is connected to the discharge casing 23.

  According to the hand pump 1C configured in this manner, similar to the hand pump 1 described above, the air is introduced into the suction chamber 11a by the suction member 27B, thereby preventing a sharp drop in the pressure in the suction chamber 11a. Thus, it is possible to prevent the operation lever 14 from jumping up.

  The present invention is not limited to the above embodiment. For example, although the hand pump 1, 1A, 1B, 1C mentioned above demonstrated the structure which has a precipitation function, it is not limited to this. The hand pump 1, 1A, 1B, 1C may not have the first projection 25b and the second projection 26b, and may not have a precipitation function. By using a hand pump having no precipitation function, for example, when used in a warm area where there is no risk of freezing, it is possible to further reduce the manufacturing cost of the hand pump.

  Moreover, in the example mentioned above, although the manual pump 1 provided the on-off valve 34 in a 1st connecting pipe and demonstrated the structure which provides the orifice 35 in the 2nd connecting pipe 32, it is not limited to this. That is, as long as the intake member 27 is configured such that the on-off valve and the orifice are provided on the flow path of air, the on-off valve 34 and the orifice 35 may be provided in the piping portion 33. Good.

In addition, although the above-described hand pump 1C has been described as being configured to include the intake member 27C having the flow path 38, for example, the flow path 38 may be configured to include the orifice 35. It may be provided in the middle of 38. Besides the above, various modifications can be made without departing from the scope of the present invention.
In the following, a description equivalent to the invention described in the original claims of the present application is appended.
[1] A cylindrical cylinder whose axial center is disposed along the vertical direction, a suction casing provided at a lower end of the cylinder and constituting the cylinder and a suction chamber, and provided at an upper end of the cylinder A main body having a discharge casing that constitutes the cylinder and the discharge chamber;
A piston portion formed on an inner peripheral surface of the cylinder so as to be capable of reciprocating, and dividing the inside of the cylinder into the suction chamber and the discharge chamber;
A piston rod connected to the piston portion;
An operating lever formed rotatably;
A link mechanism which connects the control lever and the piston rod and converts the rotation of the control lever into a reciprocating motion of the piston rod;
An intake member provided in the cylinder and capable of introducing air into the suction chamber;
A hand-held pump characterized by comprising.
[2] The intake member is
A first connection pipe provided in the cylinder;
A second connection pipe provided in the discharge casing;
A piping portion connected to the first connection pipe and the second connection pipe and configuring a flow path of air from the discharge casing to the cylinder;
An orifice provided in the flow passage,
The hand-operated pump according to [1], characterized in that it comprises.
[3] The hand pump according to [2], wherein the intake member further includes an on-off valve provided in the flow passage.
[4] The hand-operated pump according to [1], wherein the intake member is an intake and exhaust valve.
[5] The air intake member includes an outer body connected to the cylinder and having a seat surface, a valve body provided in the outer body, and a spring for biasing the valve body to the seat surface. The hand pump according to [1], further comprising a first on-off valve, wherein the valve body moves against the spring when the pressure in the suction chamber is lower than the atmospheric pressure.
[6] The hand-operated pump according to [1], wherein the intake member is a flow passage provided in the cylinder and the discharge casing and connecting the suction chamber and the discharge chamber.

  1, 1A, 1B, 1C: hand pump, 11, 11A, 11B, 11C: main body, 11a: suction chamber, 11b: discharge chamber, 12: piston member, 13: link mechanism portion, 13a: connecting shaft, 14: operation Lever 21 cylinder 22 intake casing 22a suction port 22b rib 22c first valve seat 22d first valve chamber 22e screw portion 23 discharge casing 23a discharge port 23b ... hole portion 23c shaft seal member 23d support portion 23e control member 23f lid body 24 base portion 25 first check valve 25a first valve body 25b first projection portion , 26: cover member, 26a: hole, 26b: second projection, 27, 27A, 27B, 27C: intake member, 31: first connection pipe (connection pipe), 32: second connection pipe, 33: Piping section, 34 ... on-off valve, 35 ... oliffe 36: first on-off valve 36a: outer shell 36b: valve body 36c: spring 37: second on-off valve 37a: outer shell 37b: valve body 38: flow path 41: piston rod 42 ... piston part 42a ... second valve chamber, 43 ... connection part, 45 ... piston yoke, 46 ... piston, 47 ... piston presser, 47a ... opening part, 47b ... second valve seat, 48 ... second check valve, 51: first link member 52: second link member

Claims (3)

A cylindrical cylinder whose axial center is disposed along the vertical direction, a suction casing provided at the lower end of the cylinder and constituting the cylinder and the suction chamber, and provided at the upper end of the cylinder, and the cylinder A main body comprising a discharge casing constituting a discharge chamber;
A piston portion formed on an inner peripheral surface of the cylinder so as to be capable of reciprocating, and dividing the inside of the cylinder into the suction chamber and the discharge chamber;
A piston rod connected to the piston portion;
An operating lever formed rotatably;
A link mechanism which connects the control lever and the piston rod and converts the rotation of the control lever into a reciprocating motion of the piston rod;
An intake member provided in the cylinder and capable of introducing air into the suction chamber;
Equipped with
The intake member is
A first connection pipe provided in the cylinder;
A second connection pipe provided in the discharge casing;
A piping portion connected to the first connection pipe and the second connection pipe and configuring a flow path of air from the discharge casing to the cylinder;
An orifice provided in the flow passage,
A hand-held pump characterized by comprising . The hand pump according to claim 1 , wherein the intake member further comprises an on-off valve provided in the flow passage. A cylindrical cylinder whose axial center is disposed along the vertical direction, a suction casing provided at the lower end of the cylinder and constituting the cylinder and the suction chamber, and provided at the upper end of the cylinder, and the cylinder A main body comprising a discharge casing constituting a discharge chamber;
A piston portion which is formed on an inner circumferential surface of the cylinder so as to be capable of reciprocating, and which divides the inside of the cylinder into the suction chamber and the discharge chamber;
A piston rod connected to the piston portion;
An operating lever formed rotatably;
A link mechanism which connects the operation lever and the piston rod and converts the rotation of the operation lever into a reciprocating motion of the piston rod;
An intake member provided in the cylinder and capable of introducing air into the suction chamber;
Equipped with
The intake member is connected to the cylinder, and the outer body having a seat surface, a first opening comprising a valve body provided in the outer body, a spring for urging the valve body to the seat surface, the a valve, wherein when the suction pressure in the chamber is lower than atmospheric pressure, pushing the hand the valve body is you, characterized in that moving Ko' the spring pump.