JPH0116997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a grip-barrel pump for distributing, for example, fuel for kerosene stoves and other liquids.

[Conventional technology and its problems]

This type of pump will be explained with reference to FIG.
A cylindrical part 3 screwed into the upper part for communication is provided, a cylindrical part 5 for connecting the suction pipe 15 is provided at the lower part of the connecting cylinder 2, and a cylindrical part 6 for connecting the discharge pipe 16 is provided on the side part. , valve seats 7, 8 are provided at the inner ends of both cylindrical parts 5, 6.
The valve seats 7 and 8 are provided with locking pieces 9 and 10 that protrude in the connection direction of the pipes 15 and 16, and the cylindrical parts 5 and 6 are opened and closed by the locking pieces 9 and 10. It has a structure in which valve seats 11a and 11b are hooked, and when the pump operating cylinder 1 expands and contracts, a siphon effect occurs due to the action of the valve plates 11a and 11b, and liquid is pumped up from the suction pipe 15 to the discharge pipe 16 and discharged. .

By the way, in conventional pumps,
The structure of the valve seats 7 and 8 and the valve plates 11a and 11b are disclosed in Japanese Patent Application Laid-open No. 10439 and JP-A-52-96404.
In this installation, a separate valve seat tube is loaded into the connecting tube 2 to form a valve seat, and a valve plate is attached to the valve seat tube via a hook piece.

As described above, the device in which the valve seat tube is loaded into the connecting tube 2 has a large number of parts, is expensive, and the loading and other operations are complicated.

[Purpose of the invention]

The present invention has been made with the above points in mind, and an object of the present invention is to provide a grip cylinder pump in which the valve seat cylinder and the connecting cylinder are integrally molded.

[Means to achieve the purpose]

In order to achieve the above object, in the present invention, in the above-mentioned conventional grip cylinder pump, the discharge cylinder part is extended inwardly, and the valve plate is located in the pump operating cylinder when viewed from above. A slit is formed in the extended cylindrical part through which a part of the cylindrical part of the pump operating cylinder is inserted, and the lower end of the part of the cylindrical part inserted through the slit comes into contact with the discharge side hooking piece, The connecting cylinder has the same diameter or increases in diameter as it goes upward, and the discharge side cylindrical part has the same diameter in the longitudinal direction, and the connecting cylinder, the cylindrical part, the valve seat, and the locking piece. It was made to be integrally molded.

[Effect]

In the grip barrel pump configured in this manner, when the pump operating barrel is inflated, a siphon effect occurs due to the action of each valve plate, and liquid is drawn up and discharged from the suction pipe to the discharge pipe.

During this operation, the discharge side valve plate does not come out of the latch piece because the lower end of the pump operating cylinder is in contact with the latch piece, and the suction side valve plate has the latch piece facing upward. Therefore, there is no escape.

Further, since the diameter of the connecting cylinder and the shape of the discharge side cylindrical part are limited, the valve seat and the locking piece can be integrally molded from synthetic resin within the connecting cylinder (see Examples).

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 is a grip-type pump operating cylinder, and reference numeral 2 is a circular connecting cylinder that connects a suction pipe and a discharge pipe.

The pump operating cylinder 1 has a cylinder part 3 having a slightly smaller diameter only on the lower side, and only this part is an opening.

The connecting tube 2 has a cylindrical portion 4 with a slightly larger diameter at the upper end into which the cylindrical portion 3 at the lower end of the pump operating cylinder is screwed, a cylindrical portion 5 at the lower end into which the suction pipe 15 is connected, and a discharge tube at the side wall. It has a cylindrical part 6 having the same diameter in the length direction to which the pipe 10 is connected, and these cylindrical parts 5,
Valve seats 7 and 8 are formed at the inner end of the valve 6, and on one side of these valve seats, there are locking pieces 9 and 10 that swingably support the valve plates 11a and 11b. It is formed in The cylindrical portion 6 on the discharge side extends until the valve plate 11b is located within the pump operating cylinder 1 when viewed from above.

Among the valve plate retaining pieces 9 and 10, the valve plate retaining piece 9 on the side of the suction side cylindrical portion 5 is a long, standing piece with its tip touching or approaching the lower end of the cylindrical portion 3 at the lower end of the pump operating cylinder. The valve plate 11a hooked to the valve plate 11a is prevented from coming off, and the valve plate latching piece 10 on the side of the discharge side cylindrical part 6 is a long and thin piece extending horizontally. As shown in FIGS. 2 and 3, a planar arc-shaped slit 12 into which the cylindrical portion 3 of the lower part of the pump operating cylinder is tightly fitted is formed on the upper surface of the nip portion, and as shown in FIGS.
As shown in Fig. 2, when the cylindrical part 3 is completely screwed in,
The lower end of the cylindrical portion 3 comes into contact with the valve plate retaining piece 10 to prevent the valve plate 11b located inward from that position from coming out.

As mentioned above, the lower end of the cylindrical portion 3 at the bottom of the pump operating cylinder is cut off in order to fit into the slit 12, and even if the pump operating cylinder is loosened, it is difficult for outside air to smoothly flow in to stop the siphon. A cutout groove 13 with an open lower end is formed at one place on the outer surface of the lower end of the cylinder part 3 in the pump operating cylinder, and a notch groove 14 with an open upper end is also formed on the inner wall surface of the cylinder part 4 at the upper end of the connecting cylinder 2. 1 is completely screwed in, the notch grooves 13 and 14 are separated, and only when loosened by 180 degrees, for example, both the notch grooves 13 and 14 come together to form an outside air inflow guide hole. preferable.

The valve plates 11a and 11b have a ring 17 formed on one side of a thin plastic disc, and this ring 1
7 into the latching pieces 9, 10, the valve plates 11a, 11b are swingably latched to the latching pieces 9, 10.

This embodiment is configured as described above,
Now, as shown in FIG. 1, when the pump operating barrel 1 is fully screwed in and the operating barrel 1 is expanded or contracted, the valve plates 11a and 11b act as in the conventional case, causing a siphon action, and the suction pipe Liquid is pumped up from 15 to a discharge pipe 16 and discharged.

During this operation, the lower end of the cylindrical portion 3 of the pump operating cylinder 1 is in contact with the latch piece 10, so that the discharge side valve plate 11b does not come off from the latch piece 10.
The suction side valve plate 11a does not come off because the locking piece 9 faces upward.

By the way, when the connecting tube 2 is integrally molded with resin, the mold is divided into split molds A, B, C, D, and E as shown in FIG. 4, and the molds are released in that order (A→
B→C...), then pull out the split mold A while rotating it along the screw, and when pulling out the split mold C, the cylindrical part 4
Deform it and pull out the split mold C. In addition, connection tube 2
(including the cylindrical part 4) having the same diameter or increasing diameter toward the top, it is possible to pull out the bisplit molds A and C, and furthermore, the discharge side cylindrical part 6 is cylindrical in its longitudinal direction. Since they have the same diameter, the split mold D can be pulled out. In other words, the connecting tube 2
The valve seats 7, 8 and the locking pieces 9, 10 can be integrally molded inside.

〔Effect of the invention〕

The present invention is constructed as described above, and does not have a valve seat cylinder as in the conventional case, but instead has the valve seat etc. molded integrally with the connecting cylinder, which reduces the number of parts and reduces costs. The loading effect of the valve seat cylinder is also eliminated, improving work efficiency.

Further, since the discharge side valve plate is prevented from coming off at a part of the lower end of the cylinder at the lower part of the pump operating cylinder, there is no need to form a valve plate retaining protrusion on the discharge side valve plate retaining piece. Therefore, the molding die for that part becomes simpler.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of an embodiment of the grip barrel pump according to the present invention, Fig. 2 is an enlarged cross-sectional plan view of the main parts of the same, and Fig. 3 is a plan view with the pump operating barrel of Fig. 2 removed. 4 are explanatory views of forming the connecting tube of FIG. 1. DESCRIPTION OF SYMBOLS 1... Pump operation tube, 2... Connection tube, 5... Suction side cylindrical part, 6... Discharge side cylindrical part, 7, 8... Valve seat, 9, 10... Valve plate retaining piece, 11a, 11b...
... Valve plate, 12 ... Slit, 15 ... Suction pipe, 1
6...Discharge pipe.

Claims (1)

[Claims] 1. A cylindrical part 3 screwed into the upper part of the circular connecting cylinder 2 to communicate with the upper part of the circular connecting cylinder 2 is provided at the lower part of the grip cylinder type pump operation cylinder 1, and a cylindrical part 5 for connecting the suction pipe 15 is provided at the lower part of the connecting cylinder 2. At the same time, a cylindrical part 6 for connecting the discharge pipe 16 is provided on the side, and valve seats 7 and 8 are formed at the inner ends of both the cylindrical parts 5 and 6, and each of the pipes 1
5, 16 A grip tube in which locking pieces 9, 10 are provided that protrude in the connecting direction, and valve plates 11a, 11b for opening and closing the cylindrical parts 5, 6 are swingably hung on the locking pieces 9, 10. In the pump, the discharge cylindrical portion 6 is extended inward so that the valve plate 11b is located within the pump operation cylinder 1 when viewed from above, and the extended cylindrical portion 6 is provided with the cylindrical portion 6. Slit 1 through which part of part 3 is inserted
2 and inserted through this slit 12.
A part of the lower end of the connecting tube 2 is in contact with the discharge side latching piece 10, and the connecting tube 2 has the same diameter or increases in diameter as it moves upward, and the cylindrical portion 6 has the same diameter in its length direction. A grip cylinder pump characterized in that the connecting cylinder 2, the cylindrical parts 5, 6, the valve seats 7, 8, and the locking pieces 9, 10 are integrally molded.