CN111255932A

CN111255932A - Plastic stop valve

Info

Publication number: CN111255932A
Application number: CN202010184512.3A
Authority: CN
Inventors: 罗荣森; 罗荣尧
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-06-09

Abstract

A plastic stop valve comprises a valve cover connecting insert cap, a valve clack, a valve rod with an extending operating end and a plastic valve body, wherein a valve seat is arranged in the plastic valve body, the valve seat is provided with a valve seat opening, the two ends of the plastic valve body are respectively provided with an inflow opening and an outflow opening communicated with the valve seat opening, the valve clack is provided with a valve clack rod, the valve clack rod is positioned in a through hole of the valve cover connecting insert, the valve rod is matched with an internal thread of the valve clack rod through the external thread to form a kinematic pair, the valve clack rod which is limited to rotate is driven by the rotation of the valve rod to enable the valve clack to lift and be matched with the valve seat opening to form a switch, the through hole of the valve cover connecting insert is smaller than the valve clack, a transition connecting port at the top of the plastic valve body and a, the valve cover connecting insert cap in threaded connection with the valve cover connecting insert limits the detachable valve rod in the valve cover connecting insert.

Description

Plastic stop valve

Technical Field

The invention relates to a plastic stop valve used in cooperation with a plastic water supply pipeline, which is particularly suitable for, but not limited to, polyolefin plastic water supply pipelines such as polyethylene (PE, PE-RT), polypropylene (PP, PPR), Polybutylene (PB) and steel-plastic composite pipes thereof, and the plastic stop valve is a plastic stop valve adopting a metal valve flap.

Background

A shut-off valve is a widely used type of fluid line switch. Since polyolefin plastic pipes made of polypropylene (PP, PPR), polyethylene (PE, PE-RT), and Polybutylene (PB) have advantages including no pollution to water, water supply pipes made of polyolefin plastic have been widely used in many fields. The plastic stop valve with the same advantages can be directly connected with the plastic pipeline through the hot melting socket type interface, avoids using flanges and other similar connecting pieces in the connecting process, correspondingly improves the connecting reliability, and is beneficial to reducing the manufacturing cost and the maintenance cost of the pipeline, so the plastic stop valve is widely used as an ideal variety matched with the plastic water pipe.

The plastic stop valve generally has a plastic valve body, a valve seat is arranged in the plastic valve body, the valve seat has a valve seat opening, and two ends of the plastic valve body are respectively provided with a flow inlet and a flow outlet which are communicated with the valve seat opening. The plastic valve body is provided with a valve cover connecting port, the valve cover is provided with an opening and closing mechanism, the opening and closing mechanism comprises a valve rod and a component thereof, the valve rod (which can be connected with operating structures such as a hand wheel, a handle and the like) rotates to drive the valve clack to lift, and the lifting valve clack is mutually matched with a valve seat opening in the plastic valve body to form a switch. The connection between the valve cover connecting port and the valve cover on the plastic valve body is detachable connection or non-detachable connection.

The 'detachable connection' is that when the plastic valve body is injection molded, a metal insert of a valve cover connecting port for connecting with the valve cover is pre-embedded at the connecting port of the valve cover. When the plastic stop valve is assembled, the metal insert of the valve cover connecting port is matched with the valve cover to form detachable connection. The method of 'detachable connection' has large metal consumption, so that the cost is high.

The non-detachable connection is that the valve cover connecting port and the plastic valve cover are hot-melt bonded into a whole. For example, the applicant disclosed in utility model No. 200420033402.3 a plastic stop valve, wherein the valve cover connection port is a plastic valve cover connection port whose inner side wall is made of plastic material, and the outer side wall of the plastic valve cover base body is matched with and thermally welded to the inner side wall of the plastic valve cover connection port. The connection between the valve cover connecting port on the valve body of the plastic stop valve and the valve cover is non-detachable, and the method can reduce the metal consumption. However, there is a problem in that the valve stem cannot be replaced due to occasional damage due to the valve stem being thin and protruding out of the valve body.

In order to realize the non-detachable connection between the valve cover connecting port and the valve cover on the valve body and replace the valve rod, the applicant discloses a plastic stop valve in the invention patent No. 201410832968.0, wherein the through hole of the valve cover connecting insert of the stop valve is smaller than the valve clack, the transition connecting port at the top of the plastic valve body and the plastic connecting transition piece with the valve cover connecting insert are fixed into a whole through hot melting adhesion, and the valve clack is limited in the plastic valve body. That is, the invention patent provides a technical scheme of 'non-detachable connection' and replacement of a valve rod.

Further research has revealed that the solution disclosed in the' 201410832968.0 patent application requires two seals. Namely, in the technical scheme, the valve cover 6 and the valve cover connecting insert 3 are sealed, and the valve rod 7 and the valve cover 6 are sealed. Two seals, as seen at present, have two risks of water leakage.

Therefore, further optimization of existing plastic shut-off valves is needed.

Disclosure of Invention

In view of the above situation, the present invention aims to provide an improved plastic stop valve, which can significantly reduce the usage amount of metal materials and meet the higher requirements of users on sealing performance on the premise of saving cost, compared with the current similar products, while ensuring the normal service life.

The basic structure of the plastic stop valve comprises a valve cover connecting insert cap, a valve clack, a valve rod with an extending operating end and a plastic valve body, wherein a valve seat is arranged in the plastic valve body, the valve seat is provided with a valve seat opening, two ends of the plastic valve body are respectively provided with a flow inlet and a flow outlet which are communicated with the valve seat opening, the valve clack is provided with a valve clack rod, the valve rod is positioned in a through hole of the valve cover connecting insert, the external thread of the valve rod is matched with the internal thread of the valve clack rod to form a kinematic pair, and the valve rod rotates to drive the valve clack rod which is limited to rotate to enable the. The through hole of the valve cover connecting insert is smaller than the valve clack, the transition connecting port at the top of the plastic valve body and the plastic connecting transition piece with the valve cover connecting insert are fixed into a whole through hot melting adhesion, and the valve clack is limited in the plastic valve body. The basic improvement on the basis is that a valve rod O-shaped sealing ring is arranged between the detachable valve rod and the valve cover connecting insert, and the valve cover connecting insert cap in threaded connection with the valve cover connecting insert limits the detachable valve rod in the valve cover connecting insert.

According to the plastic stop valve, the valve cover connecting insert cap in threaded connection with the valve cover connecting insert limits the detachable valve rod in the valve cover connecting insert, and the valve rod O-shaped sealing ring is arranged between the detachable valve rod and the valve cover connecting insert.

The plastic stop valve can open the valve cover connecting insert cap, and take out the valve rod and the valve rod O-shaped sealing ring from the valve cover connecting insert for replacement.

The applicant has disclosed a plastic shut-off valve in the invention patent No. 201410832968.0.

The plastic stop valve is a further preferable scheme based on the plastic stop valve disclosed in the invention patent No. 201410832968.0.

The detachable valve rod and the valve cover connecting insert of the plastic stop valve are directly sealed; 201410832968.0 discloses an indirect seal between the valve rod and the connecting insert of the valve cover of the plastic stop valve.

It can be known from the patent 201410832968.0 that a plastic stop valve has a structure in which a valve cover connecting insert is in threaded connection with a valve cover, a sealing member is used for sealing between a valve rod and the valve cover, and the valve cover connecting insert need to be sealed. That is to say, "the valve cap connected with the valve cap connecting insert through the screw thread limits the detachable valve rod in the valve cap", and two parts need to be sealed.

In the plastic stop valve, the valve rod is sealed (directly sealed) with the valve cover connecting insert through the valve rod O-shaped sealing ring, and the valve cover connecting insert cap in threaded connection with the valve cover connecting insert limits the detachable valve rod in the valve cover connecting insert. That is, the plastic shut-off valve of the present invention has only one seal.

The plastic stop valve has only one sealing position on the premise of meeting the requirements that the valve rod and the O-shaped sealing ring of the valve rod can be taken out for replacement, ensuring the normal service life and reducing the use amount of metal materials. It is apparent that one seal is more reliable than two seals and so the construction of the plastic shut-off valve of the present invention represents a significant advance over the prior art.

The valve seat of the present invention may be a valve seat made of polyolefin material. When the plastic valve body is made of polyolefin materials, the valve seat can be made of the same materials as the plastic valve body, namely the plastic valve body and the valve seat are made of the same polyolefin materials, namely the valve seat is the body of the plastic valve body and is not a specially-installed valve seat.

In the plastic stop valve with the above structure, the valve seat is preferably made of polyolefin material, and the contact part of the valve flap, which can cooperate with the valve seat to form a sealing pair, with the valve seat may include a currently commonly used rubber valve flap, a rubber gasket, etc., although it is not excluded that the contact part of the valve flap and the valve seat is made of metal material, and more preferably, the valve flap is made of metal material as a whole, such as a copper valve flap, a copper alloy valve flap, a stainless steel valve flap, etc., which have been reported at present.

The valve clack is provided with a valve clack rod, and the external thread of the valve rod is matched with the internal thread of the valve clack rod to form a kinematic pair, so that after the valve cover connecting insert cap is detached, the limit of the valve cover connecting insert cap on the valve rod can be removed, the valve rod can be directly taken out, and the valve rod can be maintained and replaced independently more conveniently.

On the basis of the structure, the plastic stop valve further improved by the invention also comprises a valve cover connecting insert cap, a valve clack, a valve rod with an extending operating end and a plastic valve body, wherein a valve seat is arranged in the plastic valve body, the valve seat is provided with a valve seat opening, two ends of the plastic valve body are respectively provided with an inflow opening and an outflow opening communicated with the valve seat opening, the valve clack is provided with a valve clack rod, the valve clack rod is positioned in a through hole of the valve cover connecting insert, the valve rod is matched with internal threads of the valve clack rod by external threads to form a kinematic pair, the valve clack rod which is limited to rotate is driven by the rotation of the valve rod to lift the valve clack and is matched with the valve seat opening to form a switch, the through hole of the valve cover connecting insert is smaller than the valve clack, a transition connecting port at the top of the, a valve rod O-shaped sealing ring is arranged between the detachable valve rod and the valve cover connecting insert, and the valve cover connecting insert cap in threaded connection with the valve cover connecting insert limits the detachable valve rod in the valve cover connecting insert. The basic improvement on the basis is that a valve cover connecting insert sealing cover is sleeved on the outer wall of the valve cover connecting insert, the valve cover connecting insert is matched with an internal thread of the valve cover connecting insert sealing cover through an external thread on the outer wall, and a valve cover connecting insert O-shaped sealing ring is arranged between the valve cover connecting insert sealing cover and the plastic connecting transition piece as well as between the valve cover connecting insert sealing cover and the outer wall of the valve cover connecting insert.

In order to prevent the water leakage phenomenon possibly occurring between the plastic connecting transition piece and the valve cover connecting insert, the valve cover connecting insert sealing cover is sleeved on the outer wall of the valve cover connecting insert, the valve cover connecting insert is matched with the inner thread of the valve cover connecting insert sealing cover through the outer thread of the outer wall, and the gap between the valve cover connecting insert sealing cover and the outer walls of the plastic connecting transition piece and the valve cover connecting insert is sealed through the valve cover connecting insert O-shaped sealing ring.

Of course, the above-mentioned measure of sealing the gap between the valve cover connecting insert sealing cover and the plastic connecting transition piece and the outer wall of the valve cover connecting insert by the valve cover connecting insert O-ring is an unnecessary measure. The plastic stop valve can meet the requirements of users without the measures, and can prevent the water leakage phenomenon possibly occurring between the plastic connecting transition piece and the valve cover connecting insert after the measures are added.

The plastic stop valve is preferably made of materials which are not easy to rust, such as brass or stainless steel, and the like, and the valve clack with the valve clack rod, the valve cover connecting insert cap, the valve rod and the valve cover connecting insert sealing cover are preferably selected.

According to the plastic stop valve, the valve cover connecting insert cap is provided with the internal thread and is connected with the external thread of the valve cover connecting insert. Of course, the valve cover connecting insert cap may have an external thread connected to an internal thread of the valve cover connecting insert.

In order to prevent the valve clack rod from rotating along with the rotation of the valve rod, the valve cover connecting insert and the valve clack rod are provided with rotation stopping matching structures for limiting the rotation of the valve clack rod, for example, the valve cover connecting insert and the valve clack rod directly adopt structures which are commonly used at present and can be matched with each other, such as quadrangle, hexagon or segmental shapes, and the like with the function of limiting the relative rotation of the valve cover connecting insert and the valve clack rod. In addition, an independent rotation stopping insert for limiting the rotation of the valve clack rod can be arranged on the plastic connecting transition piece, and the independent rotation stopping insert has a structure which can be matched with a quadrangle, a hexagon or a segment and the like.

The valve clack is provided with a valve clack rod, and the valve clack rod can be of an integral structure or a combined structure.

The structure of the plastic stop valve can also show that the valve rod which is matched with the external thread and the internal thread of the valve clack rod to form a kinematic pair is not only detachable, but also is limited in the valve cover connecting insert by the valve cover connecting insert cap, so that the valve rod and the valve rod O-shaped sealing ring can be conveniently detached, maintained or replaced only by opening the valve cover connecting insert cap in threaded connection with the valve cover connecting insert.

The anti-loosening gasket can be arranged between the valve cover connecting insert cap and the valve cover connecting insert. For example, the anti-loosening gasket is provided with at least two rotation stopping extensions, correspondingly, the valve cover connecting insert is provided with a rotation stopping groove matched with the rotation stopping extensions, and the valve cover connecting insert cap is used for limiting the detachable valve rod in the valve cover connecting insert through the anti-loosening gasket. Therefore, when the valve rod rotates the lifting valve clack, the valve rod only rubs with the anti-loosening gasket, and the rotation stopping extension part of the anti-loosening gasket is matched with the rotation stopping groove of the valve cover connecting insert, so that the anti-loosening gasket is prevented from rotating. Therefore, the valve rod can not drive the valve cover connecting insert cap to rotate, and the valve cover connecting insert cap and the valve cover connecting insert can be kept in proper matching. Thus, the valve rod can not rotate to cause the looseness of the valve cover connecting insert cap.

The present invention will be described in further detail with reference to the following detailed description of exemplary embodiments thereof as illustrated in the accompanying drawings. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples. Various substitutions and alterations according to the general knowledge and conventional practice in the art are intended to be included within the scope of the present invention without departing from the technical spirit of the present invention as described above.

Drawings

Fig. 1 is a schematic structural diagram of the plastic stop valve in example 1, in which the valve flap rises to open the valve seat opening.

Fig. 2 is a schematic structural diagram of the plastic stop valve in embodiment 1, in which the valve flap descends to close the valve seat opening.

Fig. 3 is a schematic structural diagram of the plastic valve body of the plastic stop valve in embodiment 1.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is a schematic view of fig. 3 in the direction of a.

Fig. 6 is a schematic view of fig. 3 in the direction B.

Fig. 7 is a schematic (enlarged) structural outline view of the plastic connection transition piece with the valve cover connection insert of the plastic stop valve in embodiment 1.

Fig. 8 is a cross-sectional view of fig. 7.

Fig. 9 is a schematic view of fig. 7 in the direction of a.

Fig. 10 is a schematic view of fig. 7 in the direction of B.

Fig. 11 is a schematic (enlarged) view of the external structure of the valve cover connection insert of the plastic stop valve in embodiment 1.

Fig. 12 is a cross-sectional view of fig. 11.

Fig. 13 is a schematic view of fig. 11 taken along direction a.

Fig. 14 is a schematic view of fig. 11 in the direction B.

Fig. 15 is a schematic view (enlarged view) of the external structure of the valve stem of the plastic stop valve in embodiment 1.

Fig. 16 is a schematic view (enlarged view) of the outline structure of the valve flap having the valve flap lever of the plastic stop valve in embodiment 1.

Fig. 17 is a cross-sectional view of fig. 16.

Fig. 18 is a schematic view of fig. 16 taken along direction a.

Fig. 19 is a schematic view of fig. 16 in the direction B.

Fig. 20 is a schematic (enlarged) view of the external structure of the bonnet attachment insert cap of the plastic stop valve in embodiment 1.

Fig. 21 is a cross-sectional view of fig. 20.

Fig. 22 is a schematic view of fig. 20 in the direction of a.

Fig. 23 is a schematic view of fig. 20 in the direction B.

Fig. 24 is a schematic structural view showing the raising of the valve flap of the plastic stop valve in embodiment 2 to open the valve seat opening.

Fig. 25 is a schematic structural view showing that the valve flap of the plastic stop valve in embodiment 2 descends to close the valve seat opening.

Fig. 26 is a schematic (enlarged) view of the outline structure of the sealing cover of the bonnet connection insert of the plastic stop valve in embodiment 2.

Fig. 27 is a cross-sectional view of fig. 26.

Fig. 28 is a schematic view of fig. 26 taken along direction a.

Fig. 29 is a B-direction diagram of fig. 26.

Fig. 30 is a schematic structural view of the plastic shut-off valve in embodiment 3.

Fig. 31 is a schematic (enlarged) view of the configuration of the valve cover connection insert of the plastic stop valve in embodiment 3.

Fig. 32 is a cross-sectional view of fig. 31.

Fig. 33 is a schematic view of fig. 31 in the direction of a.

Fig. 34 is a schematic view of fig. 31 in the direction B.

Fig. 35 is a cross-sectional view of fig. 34.

Fig. 36 is a schematic structural view (enlarged view) of a check washer of the plastic stop valve in embodiment 3.

Fig. 37 is a cross-sectional view of fig. 36.

Fig. 38 is a schematic view of fig. 36 in the direction of a.

Detailed Description

Example 1

As shown in fig. 1 to 23, the structure of the plastic stop valve of this embodiment includes a valve cover connecting insert cap 6, a valve flap 9, a valve rod 7 with an extending operation end, and a plastic valve body 1, wherein a valve seat is arranged in the plastic valve body 1, the valve seat has a valve seat opening 10, two ends of the plastic valve body 1 respectively have an inlet 5 and an outlet 8 communicated with the valve seat opening 10, the inlet 5 and the outlet 8 are both hot melt spigot-and-socket type interfaces, the valve flap 9 has a valve flap rod 4, the valve flap rod 4 is located in a through hole of the valve cover connecting insert 3, the valve rod 7 matches with an internal thread of the valve flap rod 4 by its external thread to form a kinematic pair, the valve flap rod 4 which is limited to rotate is driven by the rotation of the valve rod 7 to lift the valve flap 9 and matches with the valve seat opening 10 to form a switch, the through hole of the valve cover connecting insert 3 is smaller than the valve flap 9, a transition connection port 11, the valve clack 9 is limited in the plastic valve body 1, and the valve clack is characterized in that a valve rod O-shaped sealing ring 14 is arranged between the detachable valve rod 7 and the valve cover connecting embedded piece 3, and the valve cover connecting embedded piece cap 6 in threaded connection with the valve cover connecting embedded piece 3 limits the detachable valve rod 7 in the valve cover connecting embedded piece 3.

Example 2

As shown in FIGS. 24 to 29. The basic structure of the plastic stop valve of this embodiment is similar to that of embodiment 1, except that a hand wheel 18 is fixed on the upper portion of the valve rod 7 of the plastic stop valve in this embodiment, a valve cover connecting insert sealing cover 12 is sleeved on the outer wall of the valve cover connecting insert 3, the valve cover connecting insert 3 is matched with an internal thread of the valve cover connecting insert sealing cover 12 through an external thread on the outer wall, and a valve cover connecting insert O-shaped sealing ring 13 is arranged between the valve cover connecting insert sealing cover 12 and the outer walls of the plastic connecting transition piece 2 and the valve cover connecting insert 3.

Example 3

As shown in FIGS. 30 to 38. The basic structure of the plastic stop valve of this embodiment is similar to that of embodiment 2, except that a lock washer 15 is arranged between the bonnet connecting insert cap 6 and the bonnet connecting insert 3, the lock washer 15 is provided with two rotation stopping extensions 16, and the bonnet connecting insert 3 is provided with a rotation stopping groove 17 matched with the rotation stopping extensions 16.

Claims

1. The plastic stop valve comprises a valve cover connecting insert cap (6), a valve clack (9), a valve rod (7) with an extending operation end and a plastic valve body (1), wherein a valve seat is arranged in the plastic valve body (1), the valve seat is provided with a valve seat opening (10), the two ends of the plastic valve body (1) are respectively provided with a flow inlet (5) and a flow outlet (8) which are communicated with the valve seat opening (10), the valve clack (9) is provided with a valve clack rod (4), the valve clack rod (4) is positioned in a through hole of the valve cover connecting insert (3), the valve rod (7) is matched with an internal thread of the valve clack rod (4) through the external thread to form a kinematic pair, the valve rod (7) rotates to drive the valve clack rod (4) limited to rotate to enable the valve clack (9) to lift and is matched with the valve seat opening (10) to form a switch, the through hole of the valve cover connecting insert (3) is smaller than the valve clack (9) The valve cover connecting insert is characterized in that a valve rod O-shaped sealing ring (14) is arranged between the detachable valve rod (7) and the valve cover connecting insert (3), and the valve cover connecting insert cap (6) in threaded connection with the valve cover connecting insert (3) limits the detachable valve rod (7) in the valve cover connecting insert (3).

2. The plastic stop valve as claimed in claim 1, characterized in that the valve cover connecting insert (3) is sleeved with a valve cover connecting insert sealing cover (12) on the outer wall, the valve cover connecting insert (3) is matched with the inner thread of the valve cover connecting insert sealing cover (12) through the outer thread on the outer wall, and a valve cover connecting insert O-shaped sealing ring (13) is arranged between the valve cover connecting insert sealing cover (12) and the outer wall of the plastic connecting transition piece (2) and the valve cover connecting insert (3).

3. The plastic stop valve as claimed in claim 1, characterized in that a locking washer (15) is provided between the bonnet connection insert cap (6) and the bonnet connection insert (3), the locking washer (15) having at least two rotation stop extensions (16), the bonnet connection insert (3) having rotation stop recesses (17) cooperating with the rotation stop extensions (16).