CN203202259U

CN203202259U - All-plastic gate valve

Info

Publication number: CN203202259U
Application number: CN 201320120528
Authority: CN
Inventors: 董服义
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-18
Filing date: 2013-03-18
Publication date: 2013-09-18
Anticipated expiration: 2023-03-18

Abstract

The utility model discloses an all-plastic gate valve which comprises a valve body, a valve cap connected with the valve body and a valve rod arranged inside the valve body. A channel which allows media to flow is formed inside the valve body, the valve rod is arranged to be perpendicular to the flowing direction of the media, and a gate plate which is used for opening and closing the channel is connected at the lower end of the valve rod. The upper end of the valve rod penetrates through the valve cap and is fixedly connected with a handle. The valve body comprises an inner core which is made of metal and an outer shell which is made of plastics, the upper portion of the inner core is connected with the valve cap, and the lower portion of the inner core is matched with the gate valve. The outer shell wraps the periphery of the inner core, the outer wall of the inner core is provided with at least one annular groove which is used for containing an O-type ring in the circumferential direction, the inner wall of the O-type ring is contacted with the annular groove, and the periphery of the O-type ring protrudes out of the annular ring and is contacted with the outer shell. The all-plastic gate valve guarantees the tightness of the valve body, meanwhile, saves manufacturing cost and is convenient to use and mount.

Description

Overall plastic gate valve

Technical field

The utility model relates to valve and makes the field, especially relates to a kind of overall plastic gate valve.

Background technique

In the pipelines such as the oil of tap water or industrial application, gas, water, metal tube is eliminated gradually because its price is higher and the defective such as easily get rusty, easily be corroded.And aluminium-plastic pipe and plastic tube have good physics characteristic, Economy, practicability and Security and advanced piping compatibility to be widely used in hot and cold water in industry, the civil engineering, combustion gas, pressurized air, heating, food and industrial liquid pipeline system, become most popular a kind of tubing.

And pipe uses in the plastic tube on pipeline, and the gate valve that is widely used on the pipeline still adopts traditional metallic material to make, and not only manufacture cost is high, and when cooperating with plastic tube, need to adopt other crossover subs, cause and use inconvenience, also easily produce and leak.Some overall plastic gate valves have appearred in existing market, such as the disclosed Plastic sluice valves of Chinese patent CN2599340, it comprises metal inside and plastic casing, and plastic casing is coated on the periphery of inner core, and whole valve body is realized opening and closing by cooperating between metal inside and the flashboard.This Plastic sluice valves adopts metal inside to be connected with the metal bonnet, and sealability and mechanical strength and common gate valve are consistent, and shell employing plastic material not only reduces cost, and use is convenient when being connected with plastic piping.

But because the expansion coefficient of plastic casing and metal inside is inconsistent, after use a period of time, be prone to loosening phenomenon between shell and the inner core, then produce the slit, cause dielectric leakage.

The model utility content

The utility model is in order to overcome the deficiencies in the prior art, and the overall plastic gate valve of a kind of simple in structure, low cost of manufacture, long service life is provided.

To achieve these goals, the utility model is by the following technical solutions: a kind of overall plastic gate valve, comprise valve body, the bonnet that is connected with valve body and place the valve rod of valve body, be formed with a passage for the medium circulation in the valve body, valve rod arranges perpendicular to the media flow direction, the lower end of valve rod connects one for the flashboard that opens and closes passage, the upper end of valve rod passes bonnet and one handle is connected, described valve body comprises the inner core that is made of metal and the shell that is made of plastics, the top of inner core is connected with bonnet, matches with flashboard in the bottom of inner core; Shell is coated on the periphery of inner core, and along being circumferentially with at least one circular groove for accommodating O type circle, the inwall of this O type circle contacts with circular groove on the outer wall of described inner core, and the periphery of O type circle protrudes from circular groove and contacts with shell.

The utility model compared with prior art, it is simple in structure, cooperates between shell and the inner core closely, at inner core one circular groove is set, O type circle is set in the circular groove, O type circle is arranged on the circular groove, the 1/3-1/2 of O type circle periphery protrudes from cell body, and contacts with shell.And adding man-hour, the plastics of liquid are snapped into circular groove and fixed-type, and the plastics that snap in the groove have formed an axial fixing structure, and are firmly that shell and inner core is closely fixing; And O type circle is fixed between shell and the inner core firmly, and O type circle has good elasticity and sealing, and along with the accumulation of service time, even loosening between shell and the metal inside, also leakage phenomenon can not occur fully.

As preferably, described circular groove has downward-sloping upper side wall and/or has acclivitous lower wall.After the upper and lower sidewall of inclination is set, can be with dielectric impedance in circular groove, further block media leaks.When only having a circular groove, can the upper side wall of circular groove is downward-sloping, lower wall is inclined upwardly, and close to a dovetail groove, can better stop the medium that leaks out; When circular groove has two, the lower wall of upper circular groove can be arranged to, the upper side wall of lower circular groove is arranged to, and forms a dovetail shaped boss between two circular grooves, can reach good anti-leak result equally.

Further, on the outer wall of described inner core vertically or along being circumferentially with raised line.Raised line is set, can with carrying out axially between shell and inner core or radially fixing, increases the service life.

The ring rib of described raised line for circumferentially establishing along inner core can be arranged on this ring rib near the passage place for the medium circulation, can prevent better dielectric leakage.

Be arranged with a clamping cap that is connected with bonnet on the described valve rod, the lower end of clamping cap and bonnet inwall contacting point are provided with a filler, are provided with at least one groove with the filler contacting point on the valve rod.

Further, described groove is an arc groove of circumferentially establishing along valve rod.

Described shell is the housing that PP-R or PE make.

Further, described bonnet is threaded with inner core, is provided with the first seal ring between bonnet and the inner core.

Be provided with the second seal ring between the outer wall of described bonnet and the inwall of inner core.

Be provided with a locking cap between described bonnet inwall and the valve rod outer wall, locking cap is sheathed on the valve rod.

In sum, the utlity model has following advantage: 1. the inner core of an overall plastic gate valve is metal, and shell is plastics, has also saved manufacture cost when having guaranteed valve seal; 2. be provided with circular groove and O type circle between inner core and the shell, sealability is better, and leaking also can not appear in long-time the use; Circular groove also forms axial fixing structure, has prolonged the working life of valve body; 3. plastic casing cooperates quick and easy for installation with plastic tube.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is partial structurtes schematic diagram of the present utility model.

Fig. 3 is another partial structurtes schematic diagram of the present utility model.

Embodiment

In order to make those skilled in the art person better understand the utility model scheme, below in conjunction with the accompanying drawing among the utility model embodiment, the technological scheme among the utility model embodiment is carried out clear, complete description.

As shown in Figure 1, a kind of overall plastic gate valve comprises valve body 1, the bonnet 3 that is connected with valve body 1 and the valve rod 2 that places valve body 1, is formed with a passage 11 for the medium circulation in the valve body 1, valve rod 2 arranges perpendicular to the media flow direction, and the lower end of valve rod 2 is threaded one for the flashboard 4 that opens and closes passage 11; Bonnet 3 and one handle 5 are passed in the upper end of valve rod 2, and handle also can be made handwheel, rotatable handle, and handle band ovable valve stem rotates, so flashboard 4 is moved up or down, with closure or openness passage 11.

Described valve body 1 comprises the inner core 12 that is made of metal and the shell 13 that is made of plastics, the top 125 of inner core 12 is threaded with bonnet 3, the bottom 124 of inner core 12 has namely consisted of the part of passage 11, and it matches with flashboard 4, so that whole passage closure or openness; Shell 13 is coated on the periphery of inner core 12, the edge is circumferentially with the circular groove 121 that at least one circle is used for accommodating O type circle 122 on the outer wall of inner core 12, in the present embodiment, be provided with two circular grooves 121, the circular groove that wherein is positioned at the top can not placed O type circle, and the circular groove that is positioned at the below is arranged with O type circle, and the inwall of this O type circle 122 contacts with circular groove, have 1/2 circle body to protrude from circular groove 121 on this O type circle 122, the periphery of O type circle contacts with shell 13.

During manufacturing, metal inside is placed in the die cavity of moulding, again O type circle is inserted circular groove, the plastic overmold by liquid state forms shell outside metal inside, and metal inside and O type circle all plastic casing envelope firmly.There is part to clamp-on in the space of circular groove in the plastic casing, also consisted of axial fixing structure; O type circle has good elasticity and stretchability, increased the sealability of valve body, after the valve of prior art used a period of time, because the material of shell and inner core is different, thermal expansion coefficient was different, easily cause dielectric leakage, and in the technical program, adopted the O type circle of quality of rubber materials, can will become flexible the sealing gap that produces because of valve body, its sealability is fabulous, also can not occur leaking after long-time the use.

Further, in order to increase sealing effect, the lower wall 2a of the circular groove 121 of top can be set as and be inclined upwardly, the upper side wall 1a that will be positioned at the circular groove 121 of below is arranged to be inclined upwardly.Namely form a swallow-tail form boss between two circular grooves, in other embodiments, also the top and bottom sidewall of two circular grooves all can be arranged to the shape that expands outwardly, a similar swallow-tail form can reach the effect that strengthens sealing equally.

Adopt metal inside, its top and bonnet can be sealed and matched, and bottom and metal flashboard also can well be sealed and matched, during barrier gate, can not produce leakage phenomenon, prolong working life, shell adopts overall plastic manufacturing, and not only convenient and plastic tube welding has also reduced manufacture cost.Outer wall at inner core is provided with circular groove, is convenient in injection moulding process, and housing parts is clamp-oned in the groove, forms axial fixing structure, prevents that loosening phenomenon appears in shell in use for some time.

After preventing long-time the use, the phenomenon that rotates between shell and the inner core is provided with many raised lines vertically on the outer wall of described inner core 12, and during manufacturing, raised line is sticked in the plastic casing, forms spline and cooperates.

Optionally, the ring rib of described raised line for circumferentially establishing along inner core 12, concrete, can be at parameatal interior outer core loam cake along circumferentially ring rib 127 being set, this ring rib can also play certain sealing effect, and block media is toward external leakage.

Be arranged with a clamping cap 21 that is connected with bonnet 3 on the described valve rod 2, the lower end of clamping cap 21 and bonnet 3 inwall contacting points are provided with a filler 22, be provided with at least one groove 24 with filler 22 contacting points on the valve rod 2, when assembling, during extruding clamping cap 21, the part of filler 22 is got in the groove 24, form good axial restraint, filler will be stuck between clamping cap and the valve rod firmly, be conducive to increase the sealing of valve rod, also prolonged the working life of filler, after long-time the use, loosening phenomenon can not appear in filler yet, and sealability is higher.

For the ease of clamp-oning of filler, optional, described groove 24 is the arc groove that a circle is circumferentially established along valve rod 2, and the two side of arc groove is arc, and filler can be clamp-oned in the groove smoothly.

In order to improve the sealability of valve body, described bonnet 3 is threaded with inner core 12, is provided with the first seal ring 61 between bonnet 3 and the inner core 12, is provided with the second seal ring 62 between the outer wall of the inwall of described bonnet 3 and inner core 12.

For the ease of assembling, be provided with a locking cap 7 between described bonnet 3 inwalls and valve rod 2 outer walls, locking cap 7 is sheathed on the valve rod 2.

Obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under the creative work prerequisite, all should belong to the scope of the utility model protection.

Claims

1. overall plastic gate valve, comprise valve body (1), the bonnet (3) that is connected with valve body (1) and the valve rod (2) that places valve body (1), be formed with a passage (11) for the medium circulation in the valve body (1), valve rod (2) arranges perpendicular to the media flow direction, the lower end of valve rod (2) connects one for the flashboard (4) that opens and closes passage (11), the upper end of valve rod (2) is passed bonnet (3) and is connected with one handle (5), described valve body (1) comprises the inner core (12) that is made of metal and the shell (13) that is made of plastics, the top of inner core (12) is connected with bonnet (3), matches with flashboard (4) in the bottom of inner core (12); Shell (13) is coated on the periphery of inner core (12), it is characterized in that: the edge is circumferentially with at least one circular groove (121) for accommodating O type circle (122) on the outer wall of described inner core (12), the inwall of this O type circle (122) contacts with circular groove, and the periphery of O type circle (122) protrudes from circular groove (121) and contacts with shell (13).

2. overall plastic gate valve according to claim 1, it is characterized in that: described circular groove (121) has downward-sloping upper side wall (1a) and/or has acclivitous lower wall (2a).

3. overall plastic gate valve according to claim 1 is characterized in that: on the outer wall of described inner core (12) vertically or along being circumferentially with raised line.

4. overall plastic gate valve according to claim 2 is characterized in that: the ring rib of described raised line for circumferentially establishing along inner core (12).

5. each described overall plastic gate valve according to claim 1-4, it is characterized in that: be arranged with a clamping cap (21) that is connected with bonnet (3) on the described valve rod (2), the lower end of clamping cap (21) and bonnet (3) inwall contacting point are provided with a filler (22), and on the valve rod (2) and filler (22) contacting point is provided with at least one circle groove (24).

6. overall plastic gate valve according to claim 5 is characterized in that: described groove (24) is an arc groove of circumferentially establishing along valve rod (2).

7. overall plastic gate valve according to claim 6 is characterized in that: the housing that described shell (13) is made for PP-R or PE.

8. overall plastic gate valve according to claim 7, it is characterized in that: described bonnet (3) is threaded with inner core (12), is provided with between bonnet (3) and the inner core (12)

The first seal ring (61).

9. overall plastic gate valve according to claim 8 is characterized in that: be provided with the second seal ring (62) between the inwall of the outer wall of described bonnet (3) and inner core (12).

10. overall plastic gate valve according to claim 9, it is characterized in that: be provided with a locking cap (7) between described bonnet (3) inwall and valve rod (2) outer wall, locking cap (7) is sheathed on the valve rod (2).