JPS6327108Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a self-priming water pump equipped with a check valve for opening and closing a suction port.

[Conventional technology]

Self-priming water pumps are usually equipped with a check valve that opens and closes the suction port. A conventional self-priming water pump of this type will be explained based on the drawings of FIGS. 6 and 7. Reference numeral 1 denotes a casing, and the front surface of the casing 1 has a suction flange 9 with a suction port 8.
is removably attached using a connector such as a bolt (not shown). This suction port 8 is configured to be openably and closably closed by a flexible check valve 10.

As shown in the front view in FIG. 7, the check valve 10 has an annular packing portion 11 that serves as a mounting portion.
It is integrally formed with a valve part 12 that has a diameter smaller than this packing part 11 and opens and closes the suction port 8, and a narrow and thin self-hinge part 13 that connects this valve part 12 to the packing part 11. Valve part 1
A shape-retaining core plate 12a is embedded in the valve portion 2 to prevent the valve portion 12 from being bent or deformed. and,
The parts other than the core plate 12a are integrally molded from a flexible material such as rubber. The check valve 10 having such a structure is attached to the casing 1 by clamping the packing portion 11 between the casing 1 and the suction flange 9. In addition, 1 in the figure
1a... indicates a through hole through which the connector (not shown) is inserted.

Further, a water guide wall 14 facing the suction port 8 is integrally provided in the casing 1, and this water guide wall 14
is provided to be inclined with respect to the axis of the suction port 8 so as to guide the liquid sucked from the suction port 8 toward the impeller suction port 6a.

In a self-priming water pump having such a structure, the valve portion 12 of the check valve 10 is flexibly deformed as shown in FIG. In this case, only one point at the lower end of the back side of the valve part 12 is opened as shown in the figure.
It comes into contact with the protrusion 20 of the water guide wall 14 to maintain the fully open state. Note that this protrusion 2
0 prevents the valve portion 12 from coming into close contact with the water guide wall 14.

[Problem that the invention attempts to solve]

However, in such a pump, during operation, as the impeller 6 rotates, the liquid sucked from the suction port 8 flows into the impeller suction port 6a while swirling. Therefore, due to the influence of this swirling water flow, the valve part 1
2 receives a twisting force in the width direction around the self-hinge portion 13.

However, in order to improve responsiveness to pressure changes, the check valve 10 has a self-hinge portion 13 that is narrow and thin to give it flexibility. Due to the bending of the hinge portion 13, it is twisted in the width direction and tends to tilt. In addition, the back surface of the valve portion 12 contacts the water guide wall 14 at only one point, the protrusion 20, which also causes the valve portion 12 to tilt.

As a result, in the conventional structure, when receiving the above-mentioned swirling water flow, the valve part 12 is easily twisted around the self-hinge part 13, so that the self-hinge part 13 is easily damaged due to fatigue. One of the ends of the widest portion of the valve portion 12 comes into contact with the water guiding wall 14 due to its inclination, resulting in early uneven wear and the like. For example, a range B indicated by two-dot chain diagonal lines in FIG. 7 indicates a region where uneven wear occurs when the impeller 6 rotates clockwise when the check valve 10 is viewed from the pump driving side.

Therefore, the purpose of the present invention is to create a flexible check valve with a simple structure that prevents damage and wear due to the influence of water flow by forming a narrow and thin self-hinge part. However, it is an object of the present invention to provide a self-priming water pump that can effectively prevent the above problems and prolong the life of the check valve.

[Means for solving problems]

In order to achieve the above object, the present invention provides a pump equipped with a check valve having a narrow and thin self-hinge part, in which the back surface of the lower end of the valve part comes into contact with the water guide wall when the check valve is fully opened. In addition to the protruding part, a seat part is formed on which the back surface located at at least both ends of the maximum width part of the valve part comes into contact, and the heights of the protruding part and the seat part from the water guide wall are approximately the same, It is characterized in that when the valve part is fully opened, it is supported by the protrusion part and the seat part.

[Effect]

According to such a configuration, when the check valve is fully opened, the lower end of the back side of the valve part contacts the protruding part, and the water guiding wall is contacted at two points on both ends of the maximum width part or on the entire surface between both ends. Therefore, the valve parts are at least three parts apart from each other.
Since the valve part is supported at a point, inclination of the valve part is prevented, torsional fatigue does not occur in the self-hinge part, and local uneven wear due to contact of one end of the maximum width part with the water guide wall is also prevented. In addition, if the seat is higher than the contact part, the valve part is prevented from deforming such as curving by the core plate, and the water flow from the suction port is not a steady flow, so the seat should be As a fulcrum, the lower end and the self-hinge part create a see-saw phenomenon, causing expansion/contraction fatigue of the self-hinge part and local wear of the contact area with the seat part. Because of this, the seesaw phenomenon described above can also be prevented.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a casing, to whose lower rear portion a guide vent 2 and a bracket 3 are attached, and to the bracket 3 a bearing box 4 is attached. The bearing box 4 supports a rotating shaft 5 via built-in bearings 4a..., and an impeller 6 is attached to the front end of the shaft 5. A discharge port 7 is provided at the top of the casing 1.
The front surface of the casing 1 is provided with a suction port 8 as in the conventional case.
A suction flange 9 having a flange 9a and a flange 9b is detachably attached to the suction port 8 by means of a connector such as a bolt (not shown). The suction port 8 is closed by a flexible check valve 10 which can be opened and closed.

The check valve 10 may have the same structure as the conventional one, and as shown in FIGS. 4 and 5, it includes an annular packing portion 11 that serves as a mounting portion, and this packing portion 11.
A valve portion 12 that opens and closes the suction port 8 with a smaller diameter than the
The valve part 12 is integrally formed with a narrow and thin self-hinge part 13 that connects the valve part 12 to the packing part 11, and the valve part 12 has a core plate 12a for shape retention.
is embedded to prevent deformation such as curvature of the valve portion 12. The portion other than the core plate 12a is integrally molded from a flexible material such as rubber. In the check valve 10 having such a structure, the packing portion 11 is clamped between the casing 1 and the suction flange 9.

Further, the casing 1 is integrally provided with a water guide wall 14 facing the suction port 8, and this wall 14 directs the liquid sucked from the suction port 8 to the impeller suction port 6a.
The suction port 8 is provided at an angle with respect to the axis of the suction port 8 so as to be guided toward the suction port 8. And this water guide wall 1
4 includes a contact portion 20 against which the back surface of the lower end of the check valve 10 comes into contact when the check valve 10 is fully opened, and a seat portion 1 against which the back surface of at least both ends of the maximum width portion A comes into contact.
5 and 15 are provided protrudingly. The protruding heights of the contact portion 20 and the seat portions 15, 15 with respect to the water guide wall 14 are formed to be approximately the same. In addition,
This embodiment shows a case where a plurality of seat portions 15, 15 are provided protrudingly.

According to the embodiment having such a configuration, when the check valve 10 is fully opened during operation of the pump, the back surface of the valve portion 12 is connected to the seat portion 1 formed on the water guide wall 14.
5, 15 and the protrusion 20, thereby maintaining the fully open state.

Even if a swirling flow is generated by the water flow introduced from the suction port 8, according to the above embodiment, the valve part 12 is supported by the seats 15, 15 and the protruding part 20 in a fully open state, so that it has a substantially triangular shape. The support of the seats 15, 15 and the protrusion 20 prevents the valve portion 12 from twisting or seesawing, and maintains the fully open position in a very stable state. can. Therefore, the valve portion 12
wear and damage to the self-hinge portion 13 are prevented, and the durability of the check valve 10 is significantly improved.

Note that when the opening degree of the valve part 12 is small, the effect of the twisting force of the fluid is small, and even if it is slightly twisted, it will not come into contact with the water guide wall 14, so it will not be a problem, and the valve part 12 will be stably supported. Seat part 15,1
5 and the contact portion 20 are located on the back side of the valve portion 12, so that this does not adversely affect pumping performance.

In addition, although a pair of seats 15, 15 are provided in the above-mentioned embodiment, they may be provided in series. The specific structure, shape and position of the mouth, check valve, water guide wall, seat, etc., are not limited to the one embodiment described above, and can be implemented in various configurations. Of course, the present invention can also be applied to other types of self-priming pumps.

[Effect of idea]

As explained above, according to the present invention, the slanted water guiding wall of the casing is provided with an abutting part that supports the lower end of the flexible valve part when the check valve is fully opened, and at least both ends of the maximum width part. Since the seat part supporting the back side is provided protrudingly and the heights of these abutting parts and the seat part are approximately the same, the check valve in the fully open state is stably supported by these abutting part and the seat part. Despite having a narrow and thin self-hinge portion, it is possible to prevent the check valve from twisting or seesawing caused by the influence of water flow. Therefore, breakage, wear, etc. of the check valve can be effectively prevented, and the life of the check valve can be extended. In order to realize this, it is sufficient to simply provide a seat portion protruding from the water guide wall at the same height as the contact portion, resulting in a simple structure.

[Brief explanation of drawings]

1 to 5 show a self-priming water pump according to an embodiment of the present invention, in which FIG. 1 is a vertical side view, and FIG.
3 is an enlarged front view of the water guide wall, FIG. 4 is a longitudinal sectional view of the check valve, and FIG. 5 is a front view of the check valve. FIG. 6 is an enlarged sectional view showing the main parts of a conventional self-priming water pump, and FIG. 7 is a front view of a check valve. 1... Casing, 8... Suction port, 10... Check valve, 11... Packing part (installation part), 12
... Valve part, 13 ... Self-hinge part, 14 ... Water guide wall, 15 ... Seat part, 20 ... Contact part.

Claims (1)

[Scope of utility model registration request] It has a valve part with a mounting part fixed to the casing extending integrally and a core plate for shape retention embedded, and a self-hinge part formed narrow and thin between the valve part and the mounting part. A check valve made of
A suction port that is opened and closed by the valve portion of the check valve and opens into the casing, and a protrusion that is provided in the casing and that the back surface of the lower end of the valve portion comes into contact with when the check valve is fully open. and a water guide wall formed at an angle with respect to the axis of the suction port, wherein the water guide wall has at least a portion of the maximum width of the valve portion when the check valve is fully opened. A seat is formed on which the back surfaces located at both ends abut, and the height of the seat with respect to the water guide wall and the height of the protrusion with respect to the water guide wall are approximately the same, and when the valve part is fully opened, the height of the seat with respect to the water guide wall is approximately the same. A self-priming water pump characterized by being supported by a seat and a protrusion.