WO2014086249A1

WO2014086249A1 - Valve core assembly and low-torque valve

Info

Publication number: WO2014086249A1
Application number: PCT/CN2013/088230
Authority: WO
Original assignee: 上海鸿研物流技术有限公司
Priority date: 2012-12-07
Filing date: 2013-11-29
Publication date: 2014-06-12
Also published as: CN103016776A; CN103016776B

Abstract

A valve core assembly and a low-torque valve (100), the valve core assembly being arranged in a valve body (1) and being rotatable around an axis. The valve core assembly comprises a valve core (2), two driving members (5', 5'') and a transmission member (13). The top end and the bottom end of the valve core (2) are respectively provided with a recess (22, 22") forming a radial inwards protruding profile (23, 23") therein. Each of the two driving member (5', 5'') is provided with a radial outwards protruding profile (52', 52'') and elastic protruding ribs (53', 54', 53'', 54'') having releasable connection with the inner walls of the recesses (22, 22"). While the valve (100) is closed, the driving members (5', 5'') rotate to drive the valve core (2) to rotate around the axis and then to drive the upper end and the lower end of the valve core (2) to move radially synchronously and to press against a valve seat (3) of the valve. While the valve (100) is opened, the driving members (5', 5'') rotate to drive two ends of the valve (100) to move radially synchronously so as to make same separated from the valve seat (3) of the valve under the elastic action of the elastic protruding ribs (53', 54', 53'', 54''), and then to drive the valve core (2) to rotate around the axis. The valve core assembly and the valve (100) have a small opening and closing torque, a simple structure, a good manufacturing process, a simple operation and a good sealing performance.

Description

Spool assembly and low torque valve

The present invention relates to a spool assembly and a valve using the same, and more particularly to a built-in or external low-torque valve for use in a composite intermediate bulk container (IBC). Background technique

In order to optimize the technical parameters such as the diameter, pressure, torque and life of the ball valve, various valve composite opening and closing mechanisms have appeared in recent years.

The Chinese patent application No. 200720082066 discloses a low torque ball valve that provides a low torque ball valve including a valve body, a valve ball, a valve seat, a bearing seat, a valve stem, a drive, and a ball bearing connection. The disadvantage of the ball valve is that the structure of the driving device is complicated, and the external space of the valve body is extremely occupied; the driving device involves many components and the assembly process is complicated; the opening and closing rotation angle is 180 degrees; the working space formed by the valve stem and the driving device is sealed The process requirements are very high, and the traditional sealing methods and processes are prone to leakage; in addition, the processing cost is high and it is not suitable for environmental protection purposes.

Recently, a guide groove type lifting rod ball valve has been developed at home and abroad. The valve stem has an S-shaped guiding groove, which cooperates with the guide pin to drive the ball out of the valve seat when the valve stem is raised, and then rotates 90° counterclockwise to fully open the valve. . When the valve stem is lowered, the ball is rotated 90° clockwise and then pressed against the valve seat to close the valve. The disadvantage of this valve is that the valve stem has a long S-shaped guiding groove. When the rotary opening and closing, the valve stem needs to be spirally raised or lowered in the guiding groove, so the guiding groove has a large space and a large rotation angle.

Chinese Patent Application No. 99124192.4 discloses a disc-shaped double-track rotary and hoisted valve opening and closing structure, which is composed of a fixed disc, a rotating disc and a limit pin, when the external force drives the valve stem together with the rotating disc. The position pin, the limit pin rotates clockwise along the trajectory of the "arc" track on the fixed plate. When rotating to the "straight line" track connected by the "arc" track, the rotating disk continues to rotate clockwise, the limit pin is Under the forced action of the "supporting" track on the rotating disc, the "straight" track track on the fixed disc is extended to the periphery of the fixed disc. At this time, the limit pin and the valve sealing structure are closed to the valve seat, and the valve is closed. When the valve stem rotates counterclockwise along with the rotating disc, the limit pin and the sealing structure of the valve firstly follow the track of the "straight line" on the fixed disc to the center of the fixed disc under the force of "supporting" the track on the rotating disc. , then press the track of the "arc" track on the fixed plate counterclockwise to rotate the valve, the technical disadvantage of this patent is to use the "circular arc" track, which requires fine High degree, complicated processing technology, the valve core is a combined sphere, it is difficult to obtain a balanced pre-tightening force, which causes damage to the spool and shortens the life of the valve.

Chinese patent 200620105067 describes a rail type plug valve, which comprises a valve body, a valve cover, an operating member, a valve stem, a valve seat, a valve plug which forms a conical sealing pair with the valve seat, and a rail type mechanism, and the rail type mechanism is installed. The utility model comprises a track ring having two guiding grooves at the neck of the valve plug and a double pin plate having two guiding pins pinned into the guiding groove, and further comprises a lock nut and an adjusting ring for adjusting the mounting position of the track ring, the disadvantage of the patent The transmission device has a complicated structure and extremely occupies the external space of the valve body; the transmission device involves many components and the assembly process is complicated. In addition, since the valve plug of the conical sealing pair and the lock nut and the adjusting ring for adjusting the mounting position of the rail ring require multiple adjustments, the operation is complicated. Summary of the invention

The object of the present invention is a valve core assembly and a valve using the same, which have low opening and closing torque, simple structure, good manufacturing process, simple operation and good sealing performance.

In order to achieve the above object, the present invention provides a valve core assembly which is disposed in a valve body and rotatable about an axis, and is characterized by:

The spool assembly includes a spool, two drive members for driving the spool, respectively disposed at the top and bottom ends of the spool, and a transmission for transmitting the rotation of the valve stem to the drive member disposed at the bottom end of the spool Piece

The top end and the bottom end of the valve core are respectively provided with a concave portion, the inner wall of the concave portion is formed with a radially convex contour, and any one of the two driving members is provided with a radially convex contour and an elastic convex rib; as well as

The two driving members are respectively at least partially embedded in the concave portion of the top end and the bottom end of the valve core, and the elastic rib and the inner wall of the concave portion have a disengageable connection relationship. When the valve is closed, the rotation of the two driving members can be Firstly, the valve core is rotated around the axis and then converted to drive the upper and lower ends of the valve core to press against the radial movement of the valve seat, and when the valve is opened, the rotation of the two driving members is Under the elastic action of the elastic rib of the driving member, the valve core is first driven to synchronously move radially apart from the valve seat, and then the spool is driven to rotate about the axis.

Preferably, the radially inner convex contour is sequentially provided with a limiting protrusion, an initial portion, an intermediate portion and a terminating portion. Wherein, the limiting protrusion is configured to limit the radial convex contour such that the radial convex contour does not deviate from the radial convex contour during the rotation; the starting portion is a section a beveled surface, wherein the spool performs a radial movement of the squeeze valve seat when the radially outwardly convex contour moves along the starting portion; the intermediate portion is a flat flat surface for allowing the radially convex contour to stay On the intermediate portion; and the terminating portion is a protrusion of the end of the radially inner convex contour for stopping the radially convex contour to prevent the radial convex contour from rotating beyond the radially convex contour .

Preferably, the inner wall of the concave portion is further provided with a limiting concave hole, and the elastic convex rib can be inserted into the limiting concave hole or away from the limiting concave hole, and when the convex rib is caught in the limiting concave hole The rotation of the driving member can drive the spool to rotate about the axis, and when the rib is disengaged from the limiting pocket, the cooperation between the convex contour and the convex contour Next, the spool is pressed against or away from the radial movement of the valve seat of the valve.

Preferably, the driving member located at the top end of the valve core has a plate-shaped body, and a connecting hole for connecting with the valve stem is disposed at a center of the plate-shaped body, and the outer peripheral contour of the plate-shaped body is provided with the radial direction A convex contour and two of the elastic ribs.

Preferably, the driving member located at the bottom end of the valve core has a plate-shaped body, and the outer peripheral contour of the plate-shaped body is provided with the radial convex contour and two of the elastic ribs, and the center of the lower surface of the plate-shaped body is integrated A cylindrical body is extended, and a positioning post integrally extends from a center of the upper surface of the plate-shaped body, and the positioning post is coupled to the transmission member to transmit the rotation of the valve stem to the driving member.

Preferably, the bottom wall of the recessed portion of the top end and the bottom end of the valve core is provided with an elongated positioning hole, and the bottom end of the valve core is provided with a boss, and the outer periphery of the boss is disposed in the valve body The limit blocking block cooperates with the limit blocking protrusion for preventing the spool from rotating beyond a predetermined angle.

Preferably, the transmission member has a U-shaped body, and positioning holes are respectively disposed on the arms of the U-shaped body, and the cross-sectional shapes of the positioning holes are respectively related to the cross-sectional shape of the positioning post on the valve stem and the driving member The cross-sectional shape of the positioning post is matched.

Preferably, the connecting hole provided at the center of the plate-shaped body of the driving member at the top end of the spool is a spline hole for engaging with a spline on the valve stem of the valve, so that the valve can be driven when the valve stem is rotated The drive member at the top of the core rotates.

The present invention also provides a low torque valve comprising a valve body, a positioning rod, a valve seat, and a spool assembly, the valve body comprising: an inlet and an outlet having the same horizontal axis, formed between the inlet and the outlet An internal space for accommodating the valve core assembly, the valve seat being formed inside the inlet; a valve stem hole formed on the upper end wall and the lower end wall of the valve body in a vertical axis direction perpendicular to the horizontal axis And a lower end through hole; the valve stem passes through the valve stem hole and is opposite to the spool group Engaging, the positioning rod seal is received in the lower end through hole, the valve core assembly is rotatable about the vertical axis, so that the valve core and the valve seat are detachably sealingly matched, and the feature thereof The valve core assembly is the above-mentioned valve core assembly; when the valve stem drives the driving member to rotate, the radial convex contour and the radially inner convex contour cooperate, so that the valve core is respectively opened , transition between pre-closed state and fully closed state.

In a preferred embodiment, the low torque valve is a ball valve.

In the valve core assembly and the valve of the invention, when the valve core is rotated in the closed or open state, the valve core is not in contact with the valve seat or the valve body, and is in an idle state, reducing the frictional force of the contact and reducing the torque of rotation ( The spherical spool is only radially squeezed when the valve body is closed. This allows the valve stem to have a very small torque during rotation, thus achieving the effect of low torque opening and closing of the valve. In addition, the valve is well sealed. DRAWINGS

1 is an exploded perspective view showing a spool assembly and a valve according to an embodiment of the present invention; FIG. 2 is a cross-sectional view showing a spool assembly and a valve according to an embodiment of the present invention; A perspective view of a valve body assembly and a valve body of a valve of one embodiment of the invention;

4 is a perspective view showing a valve stem assembly and a valve stem of a valve according to an embodiment of the present invention;

5a-5b are structural views showing an embodiment of a valve member and a valve member at the top end of the valve body according to an embodiment of the present invention, wherein FIG. 5a is a perspective view and FIG. 5b is a plan view;

6a-6b are structural views showing an embodiment of a valve member and a valve member at a bottom end of a valve core according to an embodiment of the present invention, wherein Fig. 6a is a perspective view and Fig. 6b is a plan view;

7a-7d are structural views showing an embodiment of a valve body assembly and a valve body of a valve according to a first embodiment of the present invention, wherein Figs. 7a and 7c are perspective views, Fig. 7b is a plan view, and Fig. 7d is a bottom view. Figure

Figure 8 is a partial cross-sectional view showing a cross-sectional view of the relative position of the limit structure of the bottom end of the spool and the stopper structure of the valve body when the spool is rotated to the closed position;

Figure 9 shows a partial cut to show the limit of the bottom end of the spool when the spool is rotated to the fully open position a cross-sectional view of the relative position of the bit structure and the stop structure of the valve body;

Figure 10 is a perspective view showing a transmission member of a spool assembly and a valve according to an embodiment of the present invention;

Figures 11a and 1 ib are plan views showing the relative positions of the valve core assembly and the valve core and the drive member of the valve according to an embodiment of the present invention, wherein the elastic ribs on the drive member are engaged with the recesses of the recess of the valve core Medium; and

Figures 12a and 12b are top plan views showing the relative positions of the spool assembly and the valve stem and the drive member of the valve assembly, wherein the resilient ribs on the drive member are disengaged from the recesses of the recess of the spool, in accordance with one embodiment of the present invention. detailed description

It should be noted that the specific embodiments of the present invention are not limited to the following embodiments, and those skilled in the art should understand the present invention from the spirit of the following embodiments. The technical terms may be based on the spirit of the present invention. For the broadest understanding, for example, the valve stem is the part used to manipulate the movement of the spool.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be noted that the same or similar components in the drawings are denoted by the same reference numerals; and for the sake of clarity, the related schematic drawings omit the related components. In this document, the up, down, left, and right directions refer to the directions of the top, bottom, left, and right directions from the drawing unless otherwise specified.

1 shows an exploded perspective view of a spool assembly and a valve in accordance with a first embodiment of the present invention. Figure

2 shows a cross-sectional view of the valve 100 of Fig. 1 assembled. In this embodiment, the valve is a ball valve. As shown in FIG. 1, the ball valve 100 includes a valve body 1, a valve body 2, a valve seat 3, a valve stem 4, an upper driving member 5', a lower driving member 5", a positioning rod 6, an O-ring 7, and a valve cover 10. The sealing ring 9, the sealing ring 11, the buckle 12, and the transmission member 13. Among them, the valve body 2, the upper driving member 5', the lower driving member 5", and the transmission member 13 constitute the valve core assembly of the present invention.

The left end of the valve body 1 (the same as the orientation in the drawing, the same applies hereinafter) is closed by the valve cover 10 and the sealing ring 11, the valve seat 3 is built in the valve body 1, and the valve body 2 passes through the driving member 5" disposed at the lower portion thereof. The positioning rod 6 is disposed in the valve body 1. The right end of the valve body 1 is connected with a flange 8 (or a connector of a liquid container inner bag) to seal the valve body 2 in the valve body 1, the flange 8 and the valve body 1 An O-ring 9 is disposed between the valve rod 4 and the driving member 5', and is connected to the driving member 5" through the transmission member 13, and the driving member 5' and the driving member 5" respectively cooperate with the valve body 2, so that when When the valve stem 4 is turned, the spool 2 acts accordingly, as will be described in further detail below. Description.

Fig. 3 shows a perspective view of the valve body 1. As shown in FIG. 3 and FIGS. 1 and 2, the valve body 1 is a housing having an upper end and a lower end, and left and right sides, and an inner space is formed in the housing to accommodate the spool 2, the valve seat 3, and the drive. Parts 5' and 5", the transmission member 13, and a part of the valve stem 2. The left and right sides of the housing form a inlet la and an outlet lb respectively communicating with the container and the outside along a horizontal axis (not shown), at the entrance la A valve seat 3 is disposed on the inner side along the horizontal axis, and the upper and lower ends of the valve body 1 are respectively formed with a valve stem hole lc and a lower end through hole ld along the vertical axis (not shown) perpendicular to the horizontal axis. A limiting block l, If is disposed on both sides of the bottom and lower end through holes Id of the valve body 1, and the limit blocking blocks le and If respectively cooperate with the limit blocking protrusions of the spool 2 (hereinafter, more Detailed description), so that the spool 2 can only rotate within the valve body 1 within a range of 90 degrees.

As shown in Fig. 2, the valve stem 4 is rotatably received in the stem hole lc. The positioning rod 6 is received in the lower end through hole Id of the valve body 1, and the positioning rod 6 is sealed and fixed to the wall of the lower end through hole Id by the O-ring 7 and its upper surface is in contact with the driving member 5". Yes, although the positioning rod is a separate member in this embodiment, those skilled in the art should understand that the positioning rod may also be integrally formed on the bottom of the valve body, or other structures, as long as the supporting member 5 can be supported. "At the same time, the drive member can be provided with a degree of freedom of rotation about a vertical axis.

4 is a perspective view showing a valve stem assembly and a valve stem of a valve in accordance with an embodiment of the present invention. As shown in Fig. 4, the upper end of the valve stem 4 is integrally provided with a handle 41, and the handle 41 can be rotated to rotate the valve stem 4 about a vertical axis. A central portion of the stem 4 is formed with a sealing groove 42 and a snap groove. The O-ring 7 can be inserted into the sealing groove 42 to prevent liquid from leaking from the valve stem. The snap groove 43 cooperates with the buckle 12 to limit the valve stem 4 so that the valve stem 4 cannot be pulled out from the valve body 1. The lower end of the valve stem 4 is formed with a spline 44, and the spline 44 can cooperate with the spline hole 51' (see Fig. 5a) in the driving member 5', so that when the valve stem 4 is rotated, the rotation of the valve stem 4 can drive the driving member 5' with the rotation.

It should be noted that the function of the spline 44 and the spline hole 51' is to transmit the rotation of the valve stem 4 to the driving member 5', thereby causing the driving member 5' to rotate therewith, and those skilled in the art will appreciate that other structures may be employed. To achieve the above transmission effect. For example, the lower end of the valve stem 4 is a transmission portion having a triangular cross section, a square shape, and the like, and the drive member 5' is correspondingly provided with a transmission hole such as a triangular hole or a square hole. A guide rod 45 is also extended at the lower end of the spline 44 for engagement with the elongated locating hole in the spool 2 to guide the direction of movement of the spool, as will be described in more detail below. A positioning post 46 is further formed at the lower end of the guiding rod. The positioning post 46 has a square cross section, and the positioning post 46 is used for engaging with the positioning hole in the transmission member 13 (described in detail below), so that the rotation of the valve stem 4 drives the transmission. The piece 13 rotates. It should be noted that the cross-sectional shape of the positioning post 46 can be Other shapes such as a triangle, a hexagon, a spline, and the like, at this time, the shape of the positioning hole in the transmission member 13 is also set to match the cross-sectional shape of the positioning post 46.

Fig. 5a shows a perspective structural view of the driving member 5'. Figure 5b shows a top view of the drive member 5'. As shown in Figures 5a and 5b, the driving member 5' is a plate member having a spline hole 51' at its center, and the outer contour of the driving member 5' is formed with a radially convex contour 52' and a radially convex contour. 52' opposite two elastic ribs 53' and 54'. The radially convex contour 52' cooperates with the radially inner convex contour on the valve core 2, and the elastic ribs 53' and 54' can be detachably engaged with the limiting pockets on the valve core 2, thereby realizing the valve Low torque opening and closing, as further described below.

Fig. 6a shows a perspective structural view of the driving member 5". Fig. 6b shows a bottom view of the driving member 5". As shown in Figures 6a-6b, the driving member 5" has a plate-like body 51" integrally extending from the center of the upper surface of the plate-like body with a positioning post 55", the positioning post 55" has a square cross section, and the positioning post 55" is used for Cooperating with another positioning hole in the transmission member 13 (described in detail later), the rotation of the transmission member 13 causes the driving member 5 to rotate. It should be noted that the cross-sectional shape of the positioning post 55" may be other shapes such as a triangle, a hexagon, a spline, etc., at this time, the shape of the other positioning hole in the transmission member 13 is also set to be horizontal with the positioning post 52". The cross-sectional shape matches.

A cylindrical body 56" integrally extends from the center of the lower surface of the plate-like body 51", and the center of the positioning post 55" and the cylindrical body 56" are on the same axis. The cylinder 56" can be accommodated in the lower end through hole Id at the bottom of the valve body 1, so that the driving member 5" can be rotated about the central axis of the lower end through hole. The outer contour of the plate-like body 51'' is the same as the outer contour of the driving member 5'. SP, the plate-like body 51" has a peripheral contour including a radially convex contour 52" and two elastic ribs 53", 54".

Figures 7a-7d illustrate the specific construction of a spool 2 in accordance with one embodiment of the present invention. As shown in Figures 7a-7c, in this embodiment, the spool 2 is a substantially hollow spherical shell having a spherical body 21 and having an axis (vertical axis, not shown) around which the spool can rotate. The vertical axis direction is provided with a recess 22 on the top wall of the spherical shell. The side wall of the recess 22 is provided with a radially inner convex contour 23 and two limiting recesses 24, 25, and is provided on the bottom wall of the concave portion. An elongated positioning hole 26.

The radially inner convex contour 23 includes a stopper projection 23a facing the stopper pockets 24 and 25, a starting portion 23b, an intermediate portion 23c, and a terminating portion 23d. The limiting protrusion 23a is a protrusion on the side wall of the concave portion 22 for limiting the radial convex contour 52' and thus the valve core so that the radial convex contour 52' does not escape from the diameter during the rotation. Convex contour 23 inward. The starting portion 23d is a sloped surface, and when the radial convex contour of the spool moves along the starting portion (when the spool and the driving member are pressed against each other), the spool performs radial movement of the pressing valve seat. The intermediate portion is a flat plane that acts so that the radially convex contour can be stably and statically rested at On the middle. The terminating portion is a projection at the end of the radially inner convex contour 23 for retaining the radially outer convex contour 23 to prevent the radially outer convex contour 23 from exceeding the radially inner convex contour when rotated. When the radially convex contour of the spool is located at the intermediate portion 23c, the radially convex contour of the spool will come into contact with the terminating portion 23d, and the driving member 5 and the spool 2 are placed because of the limit of the stepped surface of the terminating portion. In a relatively static state, the spool is pressed against the seat and the valve is closed.

The elongated positioning hole 26 is an elongated hole having two parallel sides and having curved ends at both ends, which cooperate with the guide rod 45 on the valve stem 4.

As shown in Fig. 7c, the bottom end of the spherical body is provided with a boss 27, and the outer periphery of the boss 27 is provided with limit blocking projections 28, 29 which cooperate with the limit blocking blocks le, If of the valve body 1. The angle between the limit blocking projections 28, 29 is 90 degrees. During the valve closing process, when the spool is turned to the pre-closed position, the limit blocking projection 28 cooperates with the limit blocking block If (as shown in FIG. 8), thereby preventing the spool from rotating more than 90 degrees (or preventing the spool) Rotate more than a predetermined angle). During the opening of the valve, when the spool is turned to the fully open position, the limit blocking projection 29 cooperates with the limit blocking block le (as shown in Fig. 9), thereby preventing the spool from rotating more than 90 degrees.

As shown in Fig. 7d, the central portion of the boss 27 is provided with a recess 22", the side wall of the recess 22" is provided with a radially inner convex contour 23" and two recesses 24", 25", in the recess 22'' An elongated positioning hole 26" is provided on the bottom wall. The shape of the radially inner convex contour 23" is the same as the radial inner convex contour 23 on the tip end of the spool, and also includes a limiting projection 23"a, a starting portion 23"b, an intermediate portion 23'c and a terminating portion 23 in this order. "d. The elongated positioning hole 26" has the same shape as the elongated positioning hole 26 at the top end of the spool.

Figure 10 shows a perspective view of an embodiment of a transmission member 13 of a spool assembly in accordance with the present invention. As shown

As shown in Fig. 8, the transmission member 13 has a substantially U-shaped body 131. The two arms of the U-shaped body 131 are respectively provided with positioning holes 132 and positioning holes 133. The positioning holes 132 and 133 have a quadrangular cross-sectional shape. However, those skilled in the art should understand that the cross-sectional shape of the positioning holes 132, 133 may also be other polygonal shapes or irregular shapes such as triangles, as long as they are respectively related to the cross-sectional shape of the positioning post 44 on the valve stem 4 and the driving member. The cross-sectional shape of the positioning post 55 on the 5" can be matched. It should be noted that the transmission member 13 can also adopt other shape configurations as long as it can transmit the rotation of the valve stem to the driving member 5' and the driving member 5".

After the assembly is completed, as shown in FIG. 2, the valve stem 4 passes through the stem hole lc of the upper portion of the valve body 1, then passes through the spline hole 51' of the driving member 5', and is inserted into the elongated positioning of the spool 2. In the hole 26, the positioning post 46 at the end of the valve stem is inserted into the transmission hole 132 of the transmission member 13. The valve stem 4 and the wall of the valve body 1 are sealed by an O-ring 7 . The latching groove 43 of the valve stem 4 is fastened with a latching member 12, which acts as a limit blocking for the valve stem, so that the valve stem 4 cannot be pulled out from the valve body. The spline 44 on the valve stem 4 is inserted into the driving member 5', To achieve the transmission. The guide rod 45 of the valve stem is received in the elongated positioning hole 26, and the cooperation of the elongated positioning hole 26 and the stem guiding rod 45 mainly plays a radial movement of the spool (ie, radial movement along the elongated positioning hole) The role of mandatory guidance.

The driving member 5' is placed in the recess 22 at the top end of the spool 2, and the ends of the elastic ribs 53 and 54 are respectively engaged in the limiting pockets 24 and 25, and are applied to the tip of the spool 2 by being pressed. A certain elastic pressure is convex inward.

The driving member 5" is rotatably positioned in the lower end through hole Id of the valve body 1 by the positioning rod 6, and the positioning post 55" of the driving member 5" passes through the elongated positioning hole 26" at the bottom end of the valve body 2" and is inserted In the positioning hole 133 of the transmission member 13, the rotation of the transmission member 13 can drive the driving member 5 to rotate, and the axial movement of the valve core (ie, the radial movement along the elongated positioning hole) plays a role of forced guiding. . The plate-like body 51'' of the driving member 5" is located in the recess 22" at the bottom end of the spool 2, and the two elastic ribs 53", 54" thereon are respectively engaged with the two recesses 24 in the recess 22"" , 25" in. And due to the squeeze, a certain elastic pressure is applied to the radially inner cam on the bottom end of the spool 2.

Therefore, in the case where the rotational resistance of the spool 2 is small, the combination of the recess of the tip end of the spool 2 with the ends of the two elastic ribs of the driving member 5', and the recess 24" passing through the bottom end of the spool 2, The combination of the 25" and the ends of the two elastic ribs of the driving member 5", the driving member 5' and the driving member 5" can simultaneously drive the spool 2 to rotate synchronously.

When the valve is switched from the open state to the closed state, the valve stem rotates, and the valve stem is positioned by the square to cooperate with the square hole of the transmission member to drive the transmission member to drive the bottom end driving member. When the valve is in the open state, the spool is not in contact with the valve seat, and the resistance to the rotation is the friction of the rotating pair in each connecting member, so the rotational resistance is very small and almost negligible. At this time, the ends of the elastic ribs of the driving member on the top end and the bottom end of the valve core are connected with the two pits of the recess on the top end and the bottom end of the valve core so that the two driving members simultaneously rotate the spool to rotate (as shown in Fig. 11a and l ib shows), after the valve core is rotated through approximately 90 degrees, the closed end of the valve core contacts or aligns with the valve seat, and the limit blocking structure of the valve core and the valve body at the bottom end allows the valve core to be in the valve body only Rotate within a 90 degree rotation range. After the spool is rotated through approximately 90 degrees, a rotational moment is added to the valve stem, and the ends of the elastic ribs of the driving members on the top and bottom ends of the spool are disengaged from the recesses of the recesses (as shown in Figures 12a and 12b). The radial convex contour of the driving member is rotated along the radial convex contour of the valve core, so that the upper and lower ends of the valve core are synchronously moved radially (to obtain a radial moving component), and the driving members of the top end and the bottom end of the valve core are The elongated positioning holes in the recesses of the top end and the bottom end of the spool cooperate to force the radial movement of the spool, and when the radially outward convex contour rotates from the beginning of the convex contour, the spool to the valve seat Applying a predetermined pressure, the two are pressed against each other according to a predetermined pressure, and the valve is turned on. The channel is closed, thereby closing the valve.

When the valve needs to be opened, the valve stem is reversely rotated, and the rotation of the valve stem drives the driving member to rotate in the opposite direction through the transmission member. Since the pressure contact between the valve core and the valve seat has a large frictional force, the valve core does not follow the driving member. Rotating, the radial convex contour of the driving member is transferred from the end of the radially inner convex contour to the starting portion, and the elastic rib provides a restoring force to return the driving member and the recess to the initial position, which is applied to the spool at this time The pressure thus disappears, the upper and lower ends of the valve core are synchronized and the valve seat is separated, and the friction between them is also lost, and the spool is axially reset to achieve the pre-open state. At this time, since the inner peripheral wall of the concave portion is provided with a finite position projection, when the transmission member rotates in the reverse direction, the radially outward convex contour can not be reversely rotated relative to the valve core after contacting the limit projection, and at this time, the two elastic projections The end of the rib is also embedded in the recess of the inner peripheral wall of the recess, the interaction between the limiting projection and the radially convex contour, and the interaction force between the elastic rib and the inner peripheral wall recess of the recess will cause the transmission The piece drives the spool to rotate 90 degrees in the reverse direction to make the valve passage open.

In the valve core assembly and the valve of the invention, since the valve core is not in contact with the valve seat or the valve body during the pre-closing or opening process, the valve core is in an idle state, reducing the frictional force of their contact and reducing the torque of rotation (only When the valve body is closed, the spherical valve core is squeezed radially, which makes the valve rod torque very small during the rotation, so as to achieve the effect of low torque opening and closing of the valve. In addition, the valve is well sealed.

It should be noted that the valve of the foregoing embodiment of the present invention is exemplified by a ball valve, but the structure of the present invention can also be applied to other valves such as a butterfly valve. Other components of the invention may be constructed without departing from the spirit of the invention. For example, the handle and the valve stem may be separate separate components, or may be an integral component. The coupling of the valve stem and the driving member may be splined, or may be a screw connection, an anchor connection, a splicing, etc. Know the other ways to connect.

Those skilled in the art will appreciate that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics. The above embodiments are to be considered in all respects as illustrative and not restrictive. Therefore, the scope of the invention is defined by the appended claims rather All changes that come within the meaning and range of the claims are intended to be included within the scope of the appended claims.

Claims

Rights request

A spool assembly, the spool assembly being disposed in a valve body and rotatable about an axis, wherein:

The valve core assembly according to claim 1, wherein: the radially inner convex contour is sequentially provided with a limiting protrusion, an initial portion, an intermediate portion and a terminating portion, wherein

The limiting protrusion is configured to limit the radially convex contour such that the radial convex contour does not deviate from the radial convex contour during rotation;

The starting portion is a sloped surface, and when the radially outward convex contour moves along the starting portion, the spool performs a radial movement of the squeeze valve seat;

The intermediate portion is a flat plane for retaining the radially convex contour on the intermediate portion;

The terminating portion is a projection of the radially inner contoured end portion for retaining the radially outer convex contour to prevent the radially outer convex contour from rotating beyond the radially inner convex contour.

3. The valve cartridge assembly according to claim 1, wherein: the inner wall of the recess is further provided with a limiting recess, and the elastic rib can be inserted into the limiting recess or away from the limiting recess. When the rib is engaged in the limiting pocket, the rotation of the driving member can drive the spool to rotate about the axis, and when the rib is disengaged from the limiting pocket, Under the cooperation of the convex contour and the convex contour, the valve core is pressed against or away from the radial movement of the valve seat of the valve.

4. The valve cartridge assembly according to claim 1, wherein: the driving member at the top end of the valve body has a plate-like body, and a connecting hole for connecting with the valve stem is disposed at a center of the plate-shaped body. The outer peripheral contour of the plate-like body is provided with the radially convex contour and two of the elastic ribs.

5. The valve cartridge assembly of claim 1 wherein: the drive member at the bottom end of the spool has a plate-like body, the outer peripheral contour of the plate is provided with the radially convex contour and two of the a resilient rib extending integrally from a center of a lower surface of the plate-like body, and a positioning post integrally extending from a center of the upper surface of the plate-shaped body, the positioning post being coupled to the transmission member to connect the valve stem The rotation is transmitted to the drive member.

The valve core assembly according to claim 1, wherein: the bottom wall of the concave portion of the top end and the bottom end of the valve body is provided with an elongated positioning hole, and the bottom end of the valve core is provided with a boss. The outer periphery of the boss is provided with a limiting blocking protrusion that cooperates with a limiting blocking block located in the valve body for preventing the valve core from rotating beyond a predetermined angle.

The valve core assembly according to claim 1, wherein: the transmission member has a U-shaped body, and positioning holes are respectively disposed on the arms of the U-shaped body, and the cross-sectional shapes of the positioning holes are respectively The cross-sectional shape of the locating post on the valve stem matches the cross-sectional shape of the locating post on the drive member.

8. The valve cartridge assembly according to claim 4, wherein: the connecting hole is a spline hole for engaging with a spline on a valve stem of the valve, so that the valve core can be driven when the valve stem is rotated The top drive member rotates.

9. A low torque valve comprising a valve body, a positioning rod, a valve seat, and a spool assembly, the valve body comprising: an inlet and an outlet having the same horizontal axis, an internal space formed between the inlet and the outlet To accommodate the valve core assembly, the valve seat is formed inside the inlet; the valve stem hole and the lower end passage formed on the upper end wall and the lower end wall of the valve body along a vertical axis direction perpendicular to the horizontal axis a valve rod passing through the valve stem hole and engaging with the valve core assembly, the positioning rod seal being received in the lower end through hole, the valve core assembly being rotatable about the vertical axis Separably sealingly engaging the valve core and the valve seat, wherein:

The valve core assembly is the valve core assembly according to any one of claims 1 to 8; when the valve stem drives the driving member to rotate, the radial convex contour and the radially inner convex contour cooperate, The spool is caused to transition between an open state, a pre-closed state, and a fully closed state, respectively.

10. The low torque valve of claim 9 wherein: said low torque valve is a ball valve.