CN2515462Y - Plastic stop valve - Google Patents

Abstract

A plastic cut-off valve comprises a valve body, a valve core engaged with the valve body and a valve core control handle. Wherein the valve body is provided with a flow passage and two ends of the flow passage are provided with a flow inlet and a flow outlet respectively. A hot melt bell-and-socket joint of pipes is formed from the ports of the flow inlet and the flow outlet which are arranged relatively with axes parallel to each other. The upper wall of the flow passage close to the flow inlet is provided with a lower boss protruding downward, while the lower wall of the flow passage close to the flow outlet is provided with an upper boss protruding upward. Then a horizontal-upward annular plugging step which is engaged with the lower end surface of the valve core is formed at the joint of the upper and the lower bosses. The cut-off valve is characterized in that the axis of the flow outlet is higher than that of the flow inlet. Compared with the existing similar products, the utility model, the plastic cut-off valve, has larger overflow, simple structure and convenient die production.

Description

Plastic stop valve

Technical field

The utility model relates to a kind of valve, especially a kind of plastic stop valve.

Background technique

Existing a kind of plastic stop valve is made of valve body and the spool that matches with valve body and spool Joystick, is provided with runner in valve body, and the two ends of this runner have inflow port respectively and go out head piece, and inflow port and the port that goes out head piece have constituted pipe joint.In existing plastic stop valve, the aforementioned tube pipeline joint is a thermofusible spigot formula pipe joint.Simultaneously, inflow port in this plastic stop valve overlaps with the axis that goes out head piece, the lower convex platform that has downward protrusion at runner upper wall near inflow port, has convex platform protruding upward near the runner lower wall that goes out head piece, formed the ring-type shutoff step that level makes progress at this upper and lower boss place, match with this ring-type shutoff step in the lower end surface of set spool, the upper-end surface of spool then contacts with the lower end of spool Joystick or is connected.When operation spool Joystick, spool is moved downward or upward, thereby make spool implement shutoff or unlatching ring-type shutoff step, realize the keying of valve.In above-mentioned existing stop valve, because inflow port overlaps with the axis that goes out head piece, for the ring-type shutoff step that can make progress in the level that on the runner between the head piece, is provided with, near inflow port, the center that the lower convex platform of setting need extend downward runner is the position on the lower side, and is going out near the head piece, the convex platform that is provided with then need extend upwardly near the center of runner, that is to say that at upper and lower boss place, the area of passage of runner is dwindled greatly.For the ease of Mold Making, existing plastic stop valve has adopted straight runner at place, upper and lower boss position, border measuring and calculating factually, the area of passage of this place runner section are usually less than 1/2nd (general only reach normal area of passage 1/3rd) of its normal area of passage.Like this, just influenced the inflow-rate of water turbine of stop valve greatly.As if theoretically, plastic stop valve also can be copied existing metal stop valve, make the flow path wall on upper and lower boss opposite recessed upward respectively and recessed downwards, to increase the area of passage at place, upper and lower boss position as far as possible.But this kind structure will inevitably make the structure of stop valve be tending towards complicated.For plastic stop valve, the above-mentioned structural design that allows flow path wall be bent state can increase the manufacture difficulty of valve significantly, even is difficult to realize on technology.China's utility model patent once disclosed a kind of all-plastic for No. 90209079.8 and had strengthened stop valve, this stop valve is made up of valve body, flap, valve rod, valve gap and handwheel, nut bolt, diaphragm seal etc., it is characterized in that with the outer surface cylinder-packing between valve body that plastics are made and the valve gap bolton of one deck plastics, flap, stem exterior surface also cylinder-packing one deck plastics, tool claims this valve can improve decay resistance, but, the also unresolved the problems referred to above of this valve.

The model utility content

It is bigger that the purpose of this utility model provides a kind of inflow-rate of water turbine, and plastic stop valve simple in structure, easy to make.

The purpose of this utility model realizes in the following manner: allowing into and out of the parallel axes of head piece and do not overlap, promptly is with the axial offset setting into and out of head piece, and the axis of abdicating head piece is higher than the axis of inflow port.Specifically, plastic stop valve of the present utility model has valve body and spool that matches with valve body and spool Joystick, in valve body, be provided with runner, the two ends of described runner have inflow port respectively and go out head piece, described inflow port constitutes thermofusible spigot formula pipe joint with the port that goes out head piece, described inflow port and go out that head piece is oppositely arranged and axis is parallel to each other, the lower convex platform that has downward protrusion at runner upper wall near inflow port, has convex platform protruding upward near the runner lower wall that goes out head piece, on this, the lower convex platform place forms the ring-type shutoff step that level makes progress, matching with this ring-type shutoff step in the lower end surface of described spool, it is characterized in that the described axis that goes out head piece is higher than the axis of inflow port.In the utility model, the structure of spool and spool Joystick can directly be continued to use the structural type of aforementioned existing product, and spool is also identical with existing product with open theory to the shutoff of ring-type shutoff step.But, in the utility model, because the axis that goes out head piece is higher than the axis of inflow port, compares with the existing product that flushes into and out of the head piece axis, the length that the lower convex platform of this stop valve extends downwards can shorten, the center that promptly only need extend to runner is the position on the upper side, and the extending upward length and also can shorten of convex platform, its height can be lower than the central point of runner, that is to say, at upper and lower boss place, the corresponding increase of the area of passage of runner.At this moment, if still adopt straight runner simple in structure, that be easy to make at place, upper and lower boss position, the area of passage that then should locate the runner section still can surpass 1/2nd of its normal area of passage, thereby improves the inflow-rate of water turbine of stop valve effectively.In addition, in stop valve of the present utility model, pipe joint remains the thermofusible spigot formula pipe joint of non-threaded connection, utilizes this interface to carry out hot melt adhesion with plastic pipe, the pipeline that connects can not occur becoming flexible after long-term the use, can guarantee quality of connection.Herein, the inwall of set thermofusible spigot formula pipe joint can be complete bright and clean inwall, but the projection of various stripeds also can suitably be set according to actual needs.In the utility model, the above-mentioned height difference that goes out head piece axis and inflow port axis usually can be suitably selected in 1/5～4/5 this scope of inflow port internal diameter.

Compared with the aforementioned existing similar products, plastic stop valve inflow-rate of water turbine of the present utility model is bigger, and simple in structure, is convenient to Mold Making.

Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.

Description of drawings

Fig. 1 is the structural representation of plastic stop valve closed condition among the embodiment.

Fig. 2 is the structural representation of plastic stop valve opening state among the embodiment.

Embodiment

As shown in Figure 1, plastic stop valve in the present embodiment has valve body 1 and spool 2 that matches with valve body 1 and spool Joystick 3, in valve body 1, be provided with runner, the two ends of described runner have inflow port 4 respectively and go out head piece 5, described inflow port 4 constitutes thermofusible spigot formula pipe joint with the port that goes out head piece 5, described inflow port and go out head piece and be oppositely arranged, the axis 6 of the two, 7 are parallel to each other, the lower convex platform 8 that has downward protrusion at runner upper wall near inflow port 4, has convex platform protruding upward 9 near the runner lower wall that goes out head piece 5, on this, lower convex platform 8,9 places form the ring-type shutoff step 10 that level makes progress, matching with this ring-type shutoff step 10 in the lower end surface of described spool 2, it is characterized in that the described axis 7 that goes out head piece is higher than the axis 6 of inflow port.In the present embodiment, the described height difference that goes out head piece axis 7 and inflow port axis 6 is 2/5 of an inflow port internal diameter.

Claims (2)

1, a kind of plastic stop valve, have valve body and the spool that matches with valve body and spool Joystick, in valve body, be provided with runner, the two ends of described runner have inflow port respectively and go out head piece, described inflow port constitutes thermofusible spigot formula pipe joint with the port that goes out head piece, described inflow port and go out that head piece is oppositely arranged and axis is parallel to each other, the lower convex platform that has downward protrusion at runner upper wall near inflow port, has convex platform protruding upward near the runner lower wall that goes out head piece, on this, the lower convex platform place forms the ring-type shutoff step that level makes progress, matching with this ring-type shutoff step in the lower end surface of described spool, it is characterized in that the described axis that goes out head piece is higher than the axis of inflow port.

2, plastic stop valve as claimed in claim 1 is characterized in that the described height difference that goes out head piece axis and inflow port axis is 1/5～4/5 of an inflow port internal diameter.

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