JP4092318B2 - Backflow prevention type handy pump - Google Patents

Description

The present invention relates to a handy type pump that draws liquid from a container such as a drum can, and more particularly to a backflow prevention type handy pump that does not allow a liquid in a suction pipe to descend and backflow when the switch is OFF.

Conventionally, put the pump suction pipe into the liquid in the container, hold the pump handle with one hand, turn the switch on and off, and hold the discharge hose with the other hand, pump out the liquid from a large container such as a drum can Handy pumps are used to transfer liquid to the desired location.
In the conventional handy pump, when the pump (motor) is stopped after sucking the liquid in the container, the liquid (1 to 2 l) sucked into the pump (especially the suction pipe) descends back into the container and returns. When the amount of liquid remaining in the container is large, it was necessary to take out the container in the reverse direction, which was a difficult operation.
Also, when transferring the pump to the next container, when removing it from the used container,
In particular, the liquid remaining in the housing) and the hose may overflow. Especially when the liquid is dangerous with chemicals, the liquid may spill and damage the equipment, or it may cause personal injury if it hits a person.

As an improvement measure, a casing, a motor provided in the casing, a suction pipe extending downward from the casing and inserted into a drum can, and a pump housing provided on the lower end side of the suction pipe And a suction port provided on the lower end side of the pump housing,
A discharge port that is provided in the casing and discharges the liquid sucked from the suction port through the suction pipe, and is rotatably provided in the pump housing, and is sucked from the suction port by rotation of the electric motor. In a drum can pump comprising an impeller for discharging the liquid in the drum can from the discharge port, a first check that opens the valve by the rotation of the impeller and allows the liquid to flow into the pump housing from the suction port. A priming water passage formed between the valve body, the first check valve and the impeller and formed on a side surface of the pump housing, with one end opened in the drum can and the other end opened in the pump housing And a tapered valve seat portion formed on the pump housing at the other end side of the priming passage and inclined at a predetermined angle with respect to the inner wall of the pump housing , The second drum pump provided with a check valve for opening and closing the priming passage and away seated on the tapered valve seat portion is known (for example, see Patent Document 1)
.

This drum can pump achieved its intended purpose of preventing backflow, but the valve body of the check valve is supported so that one side can rotate, and retracts from the water passage when the valve is opened. At the time of valve opening, the valve body started to close due to its own weight, and then the valve body which returned to swing through the water passage was pressed by the backflow liquid and closed.
By such valve closing action, the cycle time until the valve closing is completed becomes long, and most of the liquid descends and flows backward.
In addition, when the valve is closed, both the first and second valve bodies are seated on the valve seat with hydraulic pressure and dead weight, and the valve closing force is weak.
When the pump is pulled out of the drum can, if it is tilted or bumped and given an impact, the liquid in the pump naturally leaks, and if the liquid is a dangerous chemical, it could be on the human body or equipment and was very dangerous in terms of the work environment. .

Japanese Utility Model Laid-Open No. 5-75495 (Scope of Claim for Utility Model Registration)

In addition, the imported back flow prevention type handy pump made by Roots is provided with an opening / closing lid at the inlet of the lower end of the outer pipe, and an operation pipe with the opening / closing lid attached to the lower end is inserted into the outer pipe, near the motor. The open / close lid is moved up and down by rotating the two levers.
In this backflow prevention type handy pump, since the sucked liquid itself is not involved in the backflow prevention operation, the liquid falls at the same time as the pump is stopped. Therefore, if the lid is not closed during the pump operation, the liquid sucked into the pump I can not stop.
Also, the pump must be held with one hand and the hose with one hand, so both hands are blocked, and the pump operation and lever operation cannot be operated by one person.
In addition, since the lower suction port is closed with the upper lever, the upper and lower connecting structure is complicated, and an extra connecting operation pipe for opening and closing the cover is required in the outer pipe. The liquid area was reduced, the flow resistance was reduced, and the pump capacity was down.

Also, with a general pump, if the container runs out of liquid and continues to operate as it is, it will be in an idle operation state, and since the pump rotates at a high speed, a propeller, casing (outer pipe), mechanical seal (seal part), etc. It broke down in about 1 minute due to frictional heat.
In the above drum can pump, since the valve closing speed is low, liquid does not easily remain in the outer pipe, and it is likely to be in an idling state, and failure is likely to occur.
Further, since the product manufactured by Roots is not automatically closed, it is likely to be in an idling state as before.

In addition, it is necessary to carry out the transfer work for each liquid, and when the work for a specific liquid or the work for one day is completed, the liquid must be removed from the pump from the setup and management surface and cleaned and cleaned. The pump can only prevent partial downward backflow, and liquid remains in the suction pipe, and the removal of the residual liquid requires a separate instrument and other work, which is not easy or dangerous. I also had it.
In addition, in order to extract the residual liquid even if it is manufactured by Roots, it is necessary to operate the lever while fixing the pump because the reverse operation is the reverse operation, and it is easy for one person to work. There wasn't.

The problem to be solved is that with a valve body that is pivotally supported on one side, the valve closing operation is delayed and the descending back flow cannot be prevented sufficiently, or the valve closing force is weak and liquid leaks due to impact, etc. In addition, it was not possible to remove the residual liquid during setup change and cleaning at the end of work, and it was impossible to operate alone by operating the open / close lid with the upper lever via the connection operation pipe in the outer pipe. The operation procedure with the motor operation is complicated.

The present invention provides a cylindrical first valve case at the lower part of the suction pipe in view of the problem that the descending backflow prevention based on the above prior art cannot be performed immediately, the problem that one person cannot operate or the suction capacity is reduced. A first valve seat having a circular first valve port is provided inside the lower part of the first valve case, a stopper is provided above the first valve case, and the first valve case is provided inside the first valve case. By incorporating a ball-shaped first valve body that can move up and down between the seat and the stopper, the ball-shaped first valve body existing in the water passage presses against its own weight and descending liquid against the circular first valve port Seated and first
A part of the central spherical surface of the valve body is fitted into the first valve port and closes tightly, and immediately and automatically closes when the descending liquid is pressed, and a backflow prevention device is provided at the lower end of the suction pipe. Thus, the above-mentioned problem is solved without reducing the flow rate.

Further, in view of the problem of fear of leakage during the movement of the pump based on the above prior art, the second valve case is provided at the lower part of the first valve case, and the second valve port is provided below the second valve case. By providing the second valve seat and providing the second valve body that can be seated on the second valve seat and is urged by a spring in the seating direction inside the second valve case, forcibly even if there is an external impact A handy pump is installed by ensuring that the second check valve is closed to prevent liquid leakage, and by providing a second valve opening member that projects downward from the second valve case at the lower part of the second valve body. The above-described problem is solved by opening the second check valve in the normal operation.

In addition, in view of the problem that the residual liquid must be extracted from the management surface based on the above prior art,
A second valve case is provided below the first valve case so as to be slidable up and down, the second valve case is biased downward, and the first valve body of the first valve case is opened inside the second valve case. By providing the first valve opening member to be operated, when the handy pump is pressed, the second valve case of the release mechanism is relatively raised and the first and second check valves are opened to lower the residual liquid. And pull it out
Solve the above problems.

In short, the present invention is a handy device in which a suction pipe is provided at a suction port of a housing provided with a motor, a discharge hose is provided at a discharge port of the housing, and a shaft having a propeller at the tip and rotated by the motor is provided in the suction pipe. Since it is a pump, it can be easily transported by one person.
In addition, since the cylindrical first valve case is provided at the lower end of the suction pipe, the backflow prevention device is attached to the lower end of the suction pipe, so the inside of the outer pipe remains the same as before, and the structure is simple and inexpensive. It does not reduce the pumping capacity (passage area).
In addition, a first valve seat having a circular first valve port is provided inside the lower part of the first valve case, and a stopper is provided inside the upper part of the first valve case, so that the first valve body rises with liquid. Even if it does not reach the propeller, damage to the propeller can be prevented.
In addition, since a ball-shaped first valve body that can move up and down between the first valve seat and the stopper is built in the first valve case, the first valve body presses its own weight and residual liquid when the pump is stopped. By automatically and immediately closing the 1st valve port, the liquid in the handy pump such as the housing and suction pipe does not descend and backflow, so that the residual liquid in the container can be reduced or the pump can be moved. Occasionally the liquid in the housing does not overflow and can be safely operated. Further, since the backflow is automatically prevented by stopping the pump, the switch operation for backflow prevention is unnecessary and the pump is operated by one person. I can do it.

In addition, since the first valve body is formed in a ball shape, a part of the first valve body (lower part of the central spherical surface) is located in the first valve port, so that the valve closed state can be stably maintained even if there is an external impact. The first valve body can be maintained at the center of the first valve chamber through which the liquid flows and can be immediately closed by being pressed by the descending liquid when the motor is stopped. When the liquid in the container is drastically reduced, the first valve body is closed, the liquid remains in the flow path around the propeller and the like, and a failure due to the idling operation can be prevented.
Furthermore, since the first valve body is ball-shaped, the seating portion of the first valve body on the first valve seat changes each time the valve is closed, and foreign matter can be prevented from being caught between the two. Sometimes the liquid rising in the first valve chamber rises along the spherical surface of the first valve body surface, and the pressure loss can be reduced with a smooth flow.
Further, when the valve is closed, a part of the first valve body protrudes downward from the lower end of the first valve case (valve seat forming wall of the first valve seat), so that the seating state can be further stabilized and the first reverse The first valve body can be easily moved upward when the stop valve is released.

A second valve case is provided below the first valve case, a second valve seat having a second valve port is provided inside the lower part of the second valve case, and a second valve seat is provided inside the second valve case. Since the second valve body that can be seated and is urged by a spring in the seating direction is provided, the first and second check valves in the upper and lower stages can surely prevent the leakage of the descending backflow liquid. Since a spring is interposed between the spring receiver and the second valve body, by forcibly closing the valve and maintaining the valve closed state firmly,
Leakage can be reliably prevented even if the pump is tilted or there is an external impact.
In addition, since the second valve opening member projecting downward from the second valve case is provided at the lower part of the second valve body, even if the valve is forcibly closed, it can be automatically set by simply setting the pump in a large container. The lower second check valve can be opened by the second valve opening member.

The second valve case is provided below the first valve case so as to be slidable up and down, and the second valve case is urged downward, so that the urging force brings the second valve case into the normal operating position, and the second valve case is released. The mechanism is inactivated in the first check valve of the first valve case, and normal transfer work can be performed.
In addition, since the first valve opening member for opening the first valve body of the first valve case is provided inside the upper part of the second valve case, by pressing the handy pump downward against the urging force, 1 The check valve can be easily released, and the liquid remaining in the handy pump can be easily extracted at the end of work and changeover.

Since the cylindrical first valve case is detachably attached to the lower part of the suction pipe, the backflow prevention device can be easily attached to a normal handy pump, or the backflow prevention device can be attached to a conventional handy pump. By simply changing to a pipe, the backflow prevention device can be easily installed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the backflow prevention type handy pump 1 according to the present invention has a motor 5, a switch 6, and a handle 7 at the top of a housing 4 having a suction port 2 at the bottom and a discharge port 3 at the side. have.
A suction pipe 8 is attached to the lower end of the suction port 2 of the housing 4, a backflow prevention device 9 is attached to the lower end of the suction pipe 8, and a discharge hose 11 is attached to the discharge port 3 of the housing 4 via the valve 10. ing.

As shown in FIG. 2, the housing 4 having the motor 5 attached to the upper portion is provided with a right-angle discharge flow path 12 communicating with the lower and side suction ports 2 and the discharge ports 3.
The upper end of the large-diameter outer pipe 13 is attached to the lower suction port 2 and the outer pipe 13
An inner pipe 15 is inserted so that a suction passage 14 having a cylindrical cross section is provided between the inner pipe 15 and the outer pipe 13, and the inner pipe 15 is attached to the upper wall surface of the housing 4 at the upper end. The lower end of 15 is supported inside the outer pipe 13 by a pipe support 16.
As shown in FIGS. 2 and 3, a shaft 18 is rotatably supported inside the inner pipe 15 by a shaft support 17, and the upper end of the shaft 18 passes through the housing 4 and is connected to the motor shaft 19. The lower end of 18 penetrates the cap 20 at the lower end of the inner pipe 15.
A head 22 of a propeller 21 is attached to the lower end of the shaft 18, and the propeller 21 is disposed in a circular inflow passage 23 inside the lower end of the outer pipe 13.

As shown in FIG. 3, the backflow prevention device 9 attached to the lower end of the suction pipe 8 (outer pipe 13) includes first and second check valves 24 and 25 in two stages, upper and lower, and a release mechanism 26. .
A cylindrical first valve case in the first check valve 24 of the upper first stage at the lower end of the outer pipe 13 (
(Valve box) 27 is detachably attached, and a cylindrical second valve case (valve box) 28 in the second check valve 25 in the second lower stage is attached to the outer periphery of the lower part of the first valve case 27. The release mechanism 26 is operated by attaching a small amount of the second valve case 28 to the valve case 27 slidably up and down.
As shown in FIG. 7, a spring receiver 29 and a second valve case 28 provided on the upper outer periphery of the first valve case 27.
A spring 31 is wound around the outer periphery of the first valve case 27 between the spring receivers 30 at the top end to urge the second valve case 28 downward. Further, the lower end of the first valve case 27 and the second valve case 28 A sliding restricting member 32 for preventing the second valve case 28 from dropping downward is provided in the upper middle portion, and an O-ring 33 is provided at the sliding portion of both.

First, the first check valve 24 and the release mechanism 26 in the upper first stage will be described.
As shown in FIG. 3, a ring-shaped valve seat forming wall 34 projects inwardly from the lower inside of the upper first valve case 27, and an O-ring is attached to the valve seat forming wall 34 to attach the first valve seat 35. Forming the first valve seat 35
The first valve port 36 of the circular water passage is formed on the inner side of the first valve case. In other words, the circular first valve port 36 is opened on the bottom wall of the first valve case 27 and the first valve on the bottom wall is formed. The opening edge of the mouth 36 is the first valve seat
35.
Further, a parallel pin is installed inside the upper part of the first valve case 27 and a stopper 37 is attached, and in the first valve chamber 38 between the lower first valve seat 35 and the upper stopper 37 inside the first valve case 27. A ball-shaped first valve body 39 is incorporated so as to be movable up and down.
When the first valve element 39 is seated on the first valve seat 35, the lower part of the central spherical surface of the ball-shaped first valve element 39 is the first.
The valve seat forming wall 34, the first valve seat 35, and the first valve are positioned in the valve port 36 and protrude downward from the lower end of the valve seat forming wall 34 (first valve case 27) of the first valve seat 35. Form body 39 and the like.

As shown in FIG. 7, in the vicinity of the sliding portion below the first valve case 27 and above the second valve case 28, a restriction having a moving space 40 with a predetermined interval (height) at the lower end of the first valve case 27. A receiving pin 41 is provided, and a parallel pin is installed in the upper middle part of the second valve case 28 so as to be positioned in the moving space 40, and a moving stopper 42 is provided, and the vertical distance of the moving space 40 (the valve seat forming wall 34) Between the bottom surface and the restriction receiver 41), a sliding restriction member 32 is formed in which the movement stopper 42 moves up and down.
Further, the parallel pin serving as the movement stopper 42 can freely come into contact with a ball-shaped first valve body 39 projecting downward from a first valve port 36 provided below the first valve case 27, and the release mechanism 26 is in an activated state. The first valve opening member 43 moves the first valve element 39 in the valve opening direction when the second valve case 28 is moved upward, and the parallel pin provided inside the second valve case 28 moves. The stopper 42 and the first valve opening member 43 are also used.

Next, the second check valve 25 in the second lower stage will be described.
As shown in FIG. 3, a ring-shaped valve seat forming wall 44 projects inwardly from the lower part of the second valve case 28, and a tip portion thereof forms a second valve seat 45. A circular second valve port 46 serving as a water passage is formed on the inner side. In other words, the circular second valve port 46 is opened in the bottom wall of the second valve case 28, and the second wall port 46 in the bottom wall is opened. The opening edge of the valve port 46 is formed with the second valve seat 45, and the second valve case
A spring receiver 47 is provided so as to project from the upper part of 28.
A second valve chamber between the lower second valve seat 45 and the upper spring receiver 47 in the second valve case 28.
A plate-like second valve body 49 is built in 48 so as to be movable up and down, and an upper spring receiver 47 and second
A spring 51 is interposed between spring receivers 50 provided on the upper surface of the valve body 49, and the second valve body 49 is connected to the second valve seat.
It is biased downward in the seating direction to 45.
Although the two springs 31 and 51 are attached to the backflow prevention device 9, both of them bias the second valve case 28 or the second valve body 49 downward, but are provided on the second check valve 25. The spring 51 forms an urging force that contracts due to its own weight, while the spring 31 provided on the outer periphery of the first valve case 27 as the release mechanism 26 does not contract only by its own weight, and the release mechanism 26 In order to operate, the urging force is contracted by an external force that presses the handy pump 1 downward.

In addition, a second valve opening member 52 that is inserted through the second valve port 46 is formed to protrude below the second valve body 49, and
The second valve opening member 52 is formed with an appropriately shaped water passage 53 inside or on the outer periphery, and a lower end of the second valve opening member 52 is intermittently provided at the lower end of the second valve case 28. 54a ... projecting downward.

Next, the operation of the backflow prevention type handy pump according to the present invention will be described.
Insert the suction pipe 8 of the handy pump 1 into a large container such as a drum can and immerse it in the liquid.
When the lower end of the suction pipe 8 is brought into contact with the bottom surface GR of the container, the second valve opening member 52 protruding from the lower end of the second valve case 28 resists the urging force of the spring 51, as shown in FIG. Then rise.
As shown in FIGS. 4B and 5, the seating pieces 54, 54 at the lower end of the second valve case 28 in contact with the bottom surface GR.
The liquid in the large container passes through a, passes through the water passage 53 and the second valve port 46 of the second valve opening member 52, and flows into the second valve chamber 48.
The liquid filling the second valve chamber 48 reaches the first valve port 36 of the first valve case 27, and the first valve body is liquid.
39 is pushed up, the liquid flows into the first valve chamber 38 from the first valve port 36, and the inflow passage 23 around the propeller 21 is filled with the liquid.
Then, by rotating the propeller 21 by the operation of the switch 6, the liquid rises in the suction channel 14 between the outer pipe 13 and the inner pipe 15, passes through the discharge channel 12 of the housing 4, and discharge port 3, It is transferred from the valve 10 and the discharge hose 11 to a small container or other desired location.

When the subdivision operation and the transfer operation are completed once, and the motor 5 is stopped, the liquid in the suction pipe 8 (suction flow path 14) starts to descend as shown in FIGS. In the first check valve 24, a ball-shaped first valve body 39 in the first valve chamber 38 is seated on the first valve seat 35 by its own weight and pressing of the descending liquid, and the first check valve 24 in the upper first stage. Is closed, and the descending backflow of the liquid in the suction pipe 8 is stopped.
When the liquid is pumped up, the first valve body 39 in the first valve chamber 38 is ball-shaped, so that the liquid rises along the spherical surface of the first valve body 39, and the first valve body 39 rotates appropriately. When the motor 5 is stopped, the descending liquid immediately lowers the first valve body 39 in the center of the first valve chamber 38 having a large water flow rate.
Further, in the lower second check valve 25, the spring 51 contracts due to the weight of the handy pump 1 and the liquid flows out in the open state in the same manner as when the liquid is pumped up.
The amount of liquid in the valve chamber 48 changes.

When the transfer operation is completed and the pump is set in another large container, as shown in FIG. 4D, the upper first check valve 24 is kept closed by lifting the handy pump 1. ,
At the lower second check valve 25, when the amount of liquid remaining in the large container is small, when the handy pump 1 is lifted up, the second check valve 25 is opened and the liquid flows down from the second valve chamber 48. To do.
Then, the second valve opening member 52 gradually descends by the urging force of the spring 51, and the floor G in the large container
Apart from R, the second valve body 49 is seated on the second valve seat 45, and the second valve port 46 of the lower second check valve 25 is closed.

When the handy pump 1 is pulled up from a large container, the lower second check valve 25 is closed by the forced biasing force of the spring 51 even if the pump is tilted or shocked, so the suction pipe 8
The liquid inside is prevented from leaking by the stable valve closing action of the upper first check valve 24 and the second lower check valve 24.
The check valve 25 forcibly closes the valve to prevent leakage.

When all the operations are completed, the handy pump 1 is taken out from the large container, cleaned, and stored, as shown in FIGS. 4 (e) and 7, the lower end of the suction pipe 8 is placed on the floor GR of the empty container. When abutting, the lower second check valve 25 opens in the same manner as when sucking.
Further, when the entire handy pump 1 is pressed downward, the second valve case 28 slightly opposes the urging force of the spring 31 against the upper first valve case 27 by the pressing force (the vertical amount of the moving space 40).
The first valve-opening member 43 provided in the second valve case 28 is moved relative to the first valve case 28 and the first valve case 27
The first valve element 39 is moved upward by contacting the lower end of the first valve element 39 protruding downward from the valve port 36.
The valve port 36 is opened.
The residual liquid in the suction pipe 8 (suction passage 14) is the first and second check valves 24, 25 of the upper and lower first,
As the second valve ports 36 and 46 are opened, they gradually descend and flow out to the outside.
And all the residual liquid in the backflow prevention device 9 is extracted.

Next, the case where the liquid in the container is drastically reduced or becomes minute will be described.
During normal operation, the ball-shaped first valve body 39 is lifted and opened by the rising fluid force of the pumped liquid, and the liquid is flowing, but the liquid in the container is drastically reduced or becomes minute. When the valve chamber 38 is not filled with liquid, the first valve body 39 is not floated by the force of sucking air, and the valve is closed. If the valve is closed, the liquid remains in the pump. Heat is prevented, no immediate failure occurs, and a small amount of liquid operation is detected, and the motor 5 is stopped.

The backflow prevention of the backflow prevention device 9 is made up of two stages, upper and lower, of the first and second check valves 24, 25, but the upper one stage first check valve having a ball-shaped first valve body 39. 24, and the backflow prevention device 9 has only the first and second check valves 24, 25 in the upper and lower stages and the release mechanism 26 is not provided, the first valve case of the first check valve 24 27, the second valve case 28 of the second check valve 25 may be fixed, and the second check valve 25 in the lower two stages is not provided, and the first check valve 24 in the upper one stage is not provided. A release mechanism 26 may be provided. In this case, a second valve port 46 is provided on the second valve case 28 that moves up and down.
The first valve opening member 43 is provided without the second valve body 49 and the like.
The release mechanism 26 can also be applied to the first check valve 24 having another shape, for example, a ball-shaped first valve body 39.
If the first valve opening member 43 does not protrude downward from the first valve case 27 when seated, the first valve opening member 43 is not a parallel pin but is operated as an upward protrusion that can operate with respect to the first valve body 39. well,
The shape does not matter.

It is a front view of the backflow prevention type handy pump concerning the present invention. It is a partial expanded sectional view of FIG. It is sectional drawing of the principal part expansion of FIG. It is a figure which shows various series of use states. It is a principal part expanded sectional view which shows the liquid pumping-up state in the state of FIG.4 (b). FIG. 5 is an essential part enlarged cross-sectional view showing a liquid pumping stopped state in the state of FIG. It is a principal part expanded sectional view which shows the extraction state of a residual liquid in the state of FIG.4 (e).

Explanation of symbols

8 Suction pipe 9 Backflow prevention device
13 Outer pipe
14 Suction channel
15 Inner pipe
18 shaft
21 propeller
24 First check valve
25 Second check valve
26 Release mechanism
27 1st valve case
28 Second valve case
31 Spring
35 First valve seat
36 Valve 1
37 Stopper
39 1st disc
43 First valve opening member
45 Second valve seat
46 Second valve port
49 Second valve body
51 Spring
52 Second valve opening member

Claims (5)

A handy pump in which a suction pipe is provided at a suction port of a housing provided with a motor, a discharge hose is provided at a discharge port of the housing, a shaft having a propeller at a tip and rotated by a motor is provided in the suction pipe,
A cylindrical first valve case is provided at the lower portion of the suction pipe, a first valve seat having a circular first valve port is provided inside the lower part of the first valve case, and an upper part of the first valve case is provided inside the first valve case. A stopper is provided, and a ball-shaped first valve body that is movable up and down between the first valve seat and the stopper is built in the first valve case ,
A second valve case is provided below the first valve case, a second valve seat having a second valve port is provided inside the lower part of the second valve case, and a second valve seat is provided inside the second valve case. Backflow prevention characterized in that a second valve body which is freely seated and is urged by a spring in the seating direction is provided, and a second valve opening member which protrudes downward from the second valve case is provided below the second valve body. Type handy pump. A second valve case is provided below the first valve case so as to be slidable up and down, the second valve case is biased downward, and the first valve body of the first valve case is opened inside the second valve case. The backflow prevention type handy pump according to claim 1 , further comprising a first valve opening member to be operated . A handy pump in which a suction pipe is provided at a suction port of a housing provided with a motor, a discharge hose is provided at a discharge port of the housing, a shaft having a propeller at a tip and rotated by a motor is provided in the suction pipe,
A cylindrical first valve case is provided at the lower portion of the suction pipe, a first valve seat having a circular first valve port is provided inside the lower part of the first valve case, and an upper part of the first valve case is provided inside the first valve case. A stopper is provided, and a ball-shaped first valve body that is movable up and down between the first valve seat and the stopper is built in the first valve case,
A second valve case is provided below the first valve case so as to be slidable up and down, the second valve case is biased downward, and the first valve body of the first valve case is opened inside the second valve case. A backflow prevention type handy pump comprising a first valve opening member to be operated . A handy pump in which a suction pipe is provided at a suction port of a housing provided with a motor, a discharge hose is provided at a discharge port of the housing, a shaft having a propeller at a tip and rotated by a motor is provided in the suction pipe,
A cylindrical first valve case is provided at a lower portion of the suction pipe, a first valve seat having a first valve port is provided inside the lower portion of the first valve case, and a first valve seat is provided inside the first valve case. Built-in first valve body that can be seated on
A second valve case is slidably attached to the lower portion of the first valve case, and the second valve case is biased downward, and the first valve body of the first valve case is opened inside the second valve case. A backflow prevention type handy pump comprising a first valve opening member to be operated.   5. A backflow prevention type handy pump according to claim 1, wherein a cylindrical first valve case is detachably provided at a lower portion of the suction pipe.

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