阅读说明：本技术 一种隔膜阀用阀门开关机构及隔膜阀 (Valve switch mechanism for diaphragm valve and diaphragm valve ) 是由 项少聪 于 2019-10-18 设计创作，主要内容包括：一种隔膜阀用阀门开关机构及隔膜阀,包括：阀杆,沿其长度方向直线运动以驱动膜片调整阀门的开度；阀杆螺母,套置在所述阀杆上且受驱动地转动,通过螺旋结构驱动所述阀杆沿其长度方向直线运动；膜片,所述膜片与所述阀杆相连；阀芯,所述阀芯分别与所述阀杆和所述膜片相连,所述阀芯位于阀盖内,且所述阀芯和所述阀杆二者之间设置有阻挡所述阀杆和所述阀芯相对转动的第一限位结构；通过提供上述的阀门开关结构及隔膜阀解决的技术问题在于,阀杆会随着用于替代阀盖的驱动件一起转动,导致阀杆无法实现上下直线运动,无法调节阀门开度的问题。(A valve opening and closing mechanism for a diaphragm valve and a diaphragm valve are provided with: the valve rod moves linearly along the length direction of the valve rod to drive the diaphragm to adjust the opening degree of the valve; the valve rod nut is sleeved on the valve rod and driven to rotate, and the valve rod is driven to linearly move along the length direction of the valve rod through a spiral structure; a diaphragm coupled to the valve stem; the valve core is connected with the valve rod and the diaphragm respectively, the valve core is positioned in the valve cover, and a first limiting structure for blocking the valve rod and the valve core from rotating relatively is arranged between the valve core and the valve rod; the technical problem solved by providing the valve switch structure and the diaphragm valve is that the valve rod can rotate along with a driving piece for replacing a valve cover, so that the valve rod cannot move up and down linearly, and the opening degree of the valve cannot be adjusted.)

1. A valve opening and closing mechanism for a diaphragm valve, comprising:

the valve rod (1) moves linearly along the length direction of the valve rod to drive the diaphragm (9) to adjust the opening degree of the valve;

the valve rod nut (3) is sleeved on the valve rod (1) and is driven to rotate, and the valve rod (1) is driven to linearly move along the length direction of the valve rod through a spiral structure;

a diaphragm (9), wherein the diaphragm (9) is connected with the valve rod (1);

the valve core (5), the valve core (5) respectively with the valve rod (1) with diaphragm (9) link to each other, valve core (5) are located valve gap (2), and be provided with between the two of valve core (5) and valve rod (1) and block valve rod (1) and valve core (5) relative pivoted first limit structure.

2. The valve opening and closing mechanism for a diaphragm valve of claim 1, wherein the first limit structure comprises: the limiting device comprises a limiting boss (17) arranged on one of the valve core (5) and the valve rod (1), and a limiting groove (18) arranged on the other of the valve core (5) and the valve rod (1) and matched and inserted with the limiting boss (17); the limiting boss (17) is arranged in the radial direction of the valve core (5).

3. The valve opening and closing mechanism for a diaphragm valve according to claim 2, wherein a protrusion (20) extending toward the valve stem (1) is provided on the diaphragm (9), a connecting member (21) connected with the protrusion (20) is provided at the end of the valve stem (1), and the connecting member (21) is detachably provided at the end of the valve stem (1);

the valve rod (1) and the connecting piece (21) are respectively provided with corresponding jacks in the radial direction, and the limiting boss (17) is a pin shaft inserted into the jacks.

4. A valve opening and closing mechanism for a diaphragm valve according to claim 3, wherein the inner circumferential edge of said valve body (5) of annular structure is provided with an annular extension (24) extending toward the valve stem (1), and said limit groove (18) is provided on said annular extension (24).

5. The valve opening and closing mechanism for a diaphragm valve according to any one of claims 1 to 4, wherein the diaphragm (9) is detachably connected to the valve stem (1), and the valve core (5) is sleeved on the valve stem (1);

and a second limiting structure for blocking the valve core (5) from rotating along the circumferential direction of the valve rod (1) is arranged between the valve core (5) and the valve cover (2).

6. The valve opening and closing mechanism for the diaphragm valve according to claim 5, wherein the second limit structure comprises a guide sliding groove (7) provided on one of the valve core (5) and the valve cover (2), and a guide slider (8) provided on the other of the valve core (5) and the valve cover (2) and in fit sliding connection with the guide sliding groove (7); the guide sliding groove (7) is arranged along the length direction of the valve rod (1).

7. The valve opening and closing mechanism for a diaphragm valve according to claim 6, wherein at least two of the guide slide groove (7) and the guide slider (8) which are slidably engaged with each other are arranged in a circumferential direction of the valve stem (1).

8. The valve opening and closing mechanism for a diaphragm valve according to claim 6 or 7, wherein the guide runner (7) is provided at an outer contour edge of the spool (5); the guide sliding block (8) is arranged on the inner cavity wall of the valve cover (2).

9. The valve opening and closing mechanism for a diaphragm valve according to any one of claims 1 to 8, further comprising:

the driving piece (4) is connected with the valve rod nut (3) and is used for driving the valve rod nut (3) to rotate;

the third limiting structure is used for blocking the valve rod nut (3) from sliding towards the driving piece (4) or the diaphragm (9);

the third limit structure comprises: driving piece (4) through set up through-hole (6) on it with valve-stem nut (3) cooperation can be dismantled the grafting and link to each other, third limit structure includes: a first limit step (10) arranged in the through hole (6), and a first limit bulge (11) which is arranged at one side of the valve rod nut (3) close to the driving piece (4) and is abutted against the first limit step (10), and/or,

the valve rod nut (3) is provided with a second limit step (22) arranged in the valve cover (2) and a second limit bulge (23) which is arranged on the valve rod nut (3) and is close to the diaphragm (9) and is abutted to the second limit step (22).

10. A diaphragm valve, comprising: the valve opening and closing mechanism of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of valves, mainly relates to a valve, and particularly relates to a valve switch mechanism for a diaphragm valve and the diaphragm valve.

Background

The diaphragm valve is a stop valve which uses a diaphragm as an opening and closing piece to close a flow passage, cut off fluid and separate an inner cavity of a valve body from an inner cavity of a valve cover. The valve cover of the diaphragm valve is in threaded fit with the valve rod, and the valve rod is driven to move up and down by rotating the hand wheel, so that the diaphragm is switched between a state of closing the fluid channel and a state of opening the fluid channel. The hand wheel drives the valve rod to move up and down in a rotating mode, and when the hand wheel moves down to a certain position, the valve rod pushes the diaphragm to close the fluid channel.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is that the valve rod can rotate along with the driving piece for replacing the valve cover, so that the valve rod can not move up and down and the opening degree of the valve can not be adjusted. Therefore, the invention provides a valve opening and closing mechanism, which comprises:

the valve rod moves linearly along the length direction of the valve rod to drive the diaphragm to adjust the opening degree of the valve;

the valve rod nut is sleeved on the valve rod and driven to rotate, and the valve rod is driven to linearly move along the length direction of the valve rod through a spiral structure; a diaphragm coupled to the valve stem; the valve core is connected with the valve rod and the diaphragm respectively, the valve core is positioned in the valve cover, and a first limiting structure for blocking the valve rod and the valve core from rotating relatively is arranged between the valve core and the valve rod.

The valve switch mechanism for the diaphragm valve is characterized in that the first limit structure comprises: the limiting groove is arranged on the other of the valve core and the valve rod and is in matched and inserted connection with the limiting boss; the limiting boss is arranged in the radial direction of the valve core.

The diaphragm is provided with a convex part extending towards the valve rod direction, the end part of the valve rod is provided with a connecting piece matched and connected with the convex part, and the connecting piece is detachably arranged at the end part of the valve rod;

the valve rod and the radial direction of the connecting piece are respectively provided with correspondingly arranged jacks, and the limiting boss is a pin shaft inserted into the jack.

The inner ring edge of the valve core is provided with an annular extension part extending towards the valve rod direction, and the limiting groove is arranged on the annular extension part.

The diaphragm is detachably connected with the valve rod, and the valve core is sleeved on the valve rod;

and a second limiting structure for blocking the valve core (5) from rotating along the circumferential direction of the valve rod (1) is arranged between the valve core and the valve cover.

The second limiting structure comprises a guide sliding groove arranged on one of the valve core and the valve cover and a guide sliding block arranged on the other of the valve core and the valve cover and matched with the guide sliding groove in a sliding connection manner; the guide sliding groove is arranged along the length direction of the valve rod.

The number of the guide sliding chutes and the number of the guide sliding blocks which are matched with each other in a sliding manner are at least two, and the guide sliding chutes and the guide sliding blocks are arranged in the circumferential direction of the valve rod.

The guide sliding groove is arranged on the edge of the outer contour of the valve core; the guide sliding block is arranged on the wall of the inner cavity of the valve cover.

The valve opening and closing mechanism further comprises:

the driving piece is connected with the valve stem nut and is used for driving the valve stem nut to rotate;

the third limiting structure is used for blocking the valve rod nut from sliding towards the driving piece or the diaphragm;

the third limit structure comprises: the driving piece through set up on it the through-hole with the grafting is dismantled in the valve stem nut cooperation and is linked to each other, third limit structure includes: a first limit step arranged in the through hole, a first limit bulge arranged at one side of the valve rod nut close to the driving piece and abutted against the first limit step, and/or,

the second limiting step is arranged in the valve cover, and the second limiting bulge is arranged on the valve rod nut, is close to the diaphragm and is abutted against the second limiting step.

10. A diaphragm valve, comprising: the valve opening and closing mechanism of any of the above.

The technical scheme of the invention has the following advantages:

1. the invention provides a valve switch mechanism for a diaphragm valve, which comprises: the valve rod moves linearly along the length direction of the valve rod to drive the diaphragm to adjust the opening degree of the valve; the valve rod nut is sleeved on the valve rod and driven to rotate, and the valve rod is driven to linearly move along the length direction of the valve rod through a spiral structure; a diaphragm coupled to the valve stem; the valve core is connected with the valve rod and the diaphragm respectively, the valve core is positioned in the valve cover, and a first limiting structure for blocking the valve rod and the valve core from rotating relatively is arranged between the valve core and the valve rod. Through inciting somebody to action in this application valve-stem nut cover is put on the valve rod, the hand wheel drives valve-stem nut original place rotation, because valve rod and valve-stem nut set up for helical structure, thereby valve-stem nut can drive valve rod is along its length direction linear motion. In this way, the valve rod nut can be driven to rotate in situ through the hand wheel, so that the valve rod is driven to push the diaphragm to close and open the fluid channel, the valve rod nut is convenient to replace, and the use and maintenance cost of a user is effectively reduced. Therefore, the problems that in the prior art, the valve rod needs to be matched with threads on the valve cover, the valve rod is driven to move up and down by rotating the hand wheel, when the hand wheel moves down to a certain position, the valve rod pushes the diaphragm to close the fluid channel, the reaction force applied to the valve rod by the diaphragm is converted into the force applied to the valve cover threads, and meanwhile, the valve cover threads generate reaction force on the valve rod threads to cause damage to the threads on the valve cover, but the valve cover is difficult to replace, and the maintenance cost is high and the replacement is difficult are solved. In addition, the valve rod can rotate along with a valve rod nut for replacing a valve cover, so that the valve rod cannot move up and down linearly, and the opening degree of the valve cannot be adjusted. Still be provided with first limit structure in this application, above-mentioned first limit structure sets up the case with between the two of valve rod, in order to restrict the valve rod is rotatory along its circumferential direction. Because the valve core is connected with the diaphragm and cannot rotate, the valve core can effectively prevent the valve rod from rotating along the circumferential direction of the valve rod, so that the valve rod can move up and down under the drive of the valve rod nut to adjust the opening of the valve.

2. The invention provides a valve switch mechanism for a diaphragm valve, wherein a first limit structure comprises: the limiting groove is arranged on the other of the valve core and the valve rod and is in matched and inserted connection with the limiting boss; the limiting boss is arranged in the radial direction of the valve core, the valve core and the valve rod are matched and spliced through the limiting boss and the limiting groove, the structure can be used for simply and conveniently limiting the valve rod through the valve core, the valve rod can not rotate, the valve core can generate a limiting effect on the valve rod, the rotation of the valve rod is limited, and the valve rod can move linearly up and down under the action of the spiral structure.

3. The invention provides a valve switch mechanism for a diaphragm valve, wherein a bulge extending towards the direction of a valve rod is arranged on a diaphragm, a connecting piece matched and connected with the bulge is arranged at the end part of the valve rod, and the connecting piece is detachably arranged at the end part of the valve rod; the valve rod and the radial direction of the connecting piece are respectively provided with correspondingly arranged jacks, and the limiting boss is a pin shaft inserted into the jack. The valve rod and the connecting piece are respectively provided with corresponding jacks in the radial direction, and the limiting boss is a pin shaft inserted into the jack; the valve rod and the connecting piece can be detachably connected through the pin shaft, so that the effects of simplicity in disassembly and convenience in installation can be achieved, in addition, the pin shaft can be limited by the limiting groove, the valve rod can not rotate, the valve core can limit the valve rod in a limiting effect, the rotation of the valve rod is limited, and the valve rod can vertically move under the action of the spiral structure, so that the effects of reduction of equipment damage and frequent replacement in a later period are achieved.

4. The invention provides a valve switching mechanism for a diaphragm valve, wherein an annular extension part extending towards the direction of a valve rod is arranged on the inner annular edge of a valve core of an annular structure, a limiting groove is arranged on the annular extension part, and the limiting groove and the annular extension part are used for limiting through a pin shaft.

5. The invention provides a valve switch mechanism for a diaphragm valve, wherein a limiting groove is a U-shaped groove, and the limiting groove is matched with a pin shaft in size and is fixed with the limiting groove through the pin shaft, so that the effect of better preventing the valve rod from rotating can be achieved. And the connection mode of the limiting groove and the pin shaft of the U-shaped structure is simple and convenient to install.

6. The invention provides a valve switching mechanism for a diaphragm valve, wherein a diaphragm is detachably connected with a valve rod, and a valve core is sleeved on the valve rod; a second limiting structure for blocking the valve core from rotating along the circumferential direction of the valve rod is arranged between the valve core and the valve cover, the valve core is connected with the diaphragm, the valve rod is detachably connected with the diaphragm, and the valve core connected with the diaphragm can not rotate along the circumferential direction of the valve core through the second limiting structure, so that the diaphragm can not rotate, if the diaphragm rotates, the diaphragm can deform, the diaphragm can be damaged to a certain extent for a long time, the cost can be increased, in addition, a gap can be formed between the diaphragm and a sealed fluid channel, and the problems of poor sealing effect and inaccurate flow control of the valve can be caused; or when the diaphragm rotates, the connection position between the diaphragm and the sealed opening is not accurately butted, so that the problems of poor sealing effect and inaccurate flow control are caused.

7. The invention provides a valve switching mechanism for a diaphragm valve, wherein a second limiting structure comprises a guide sliding groove and a guide sliding block, wherein the guide sliding groove is arranged on one of a valve core and a valve cover, and the guide sliding block is arranged on the other of the valve core and the valve cover and is matched with the guide sliding groove in a sliding connection manner; the direction spout is followed valve rod length direction sets up, through be provided with the direction spout and with the direction slider that the direction spout cooperation slides and links to each other, just the direction spout is followed valve rod length direction sets up. The guide sliding groove is arranged in the length direction of the valve rod, so that the valve rod is effectively prevented from rotating at a possible position due to the action of external force such as vibration in the up-and-down moving process. Therefore, the valve rod connected with the diaphragm cannot rotate along the circumferential direction of the valve rod, the diaphragm cannot rotate in position effectively, and the diaphragm can move vertically and vertically to effectively prevent the diaphragm from rotating. The problems of poor sealing effect and inaccurate flow control of the valve caused by the fact that the diaphragm deforms when the diaphragm rotates and a gap is formed between the diaphragm and a sealed fluid channel are solved; or when the diaphragm rotates, the connection position between the diaphragm and the sealed opening is not accurately butted, so that the problems of poor sealing effect and inaccurate flow control are caused.

8. The invention provides a valve switching mechanism for a diaphragm valve, which is characterized in that at least two guide sliding chutes and at least two guide sliding blocks which are matched and connected in a sliding manner are arranged in the circumferential direction of a valve rod. The purpose of good guiding effect can be achieved by the matched sliding of the guide sliding groove and the guide sliding block in the length direction of the guide sliding block, and in addition, the valve core and the valve cover can be stressed more uniformly and the effect of blocking the rotation of the valve core is better by at least two guide sliding grooves and two guide sliding blocks.

9. The invention provides a valve opening and closing mechanism for a diaphragm valve, wherein a limiting rib used for reinforcing a guide sliding groove to prevent the guide sliding groove from deforming is arranged on a valve core, and the valve core can be firmer and more reliable by arranging the limiting rib in the process of preventing the valve core from rotating, so that the guide sliding groove is prevented from deforming.

10. The invention provides a valve switching mechanism for a diaphragm valve, wherein the length of a guide sliding chute is smaller than that of a guide sliding block; in the opening or closing state of the valve, the guide sliding grooves are completely embedded on the guide sliding blocks, the length of the guide sliding grooves is smaller than that of the guide sliding blocks, in the opening or closing state of the valve, the guide sliding grooves are completely embedded on the guide sliding blocks, so that the guide sliding blocks and the guide sliding grooves cannot be separated, and the valve rod is stably and reliably positioned in the circumferential direction through the limiting structure no matter the guide sliding grooves are completely embedded in the guide sliding blocks at any time, so that the valve rod is prevented from rotating in the circumferential direction.

11. The invention provides a valve switching mechanism for a diaphragm valve, which further comprises a third limiting structure for blocking the valve rod nut from sliding towards the driving piece or the diaphragm direction; the valve rod nut is driven to rotate in situ by the driving piece, the valve rod nut drives the valve rod to move up and down by driving the spiral structure, the other end of the valve rod is connected with the diaphragm, so that the diaphragm can be driven to further seal and open a fluid channel, and the valve rod nut can be prevented from shifting in the rotating process by the third limiting structure, so that the valve rod nut is prevented from shifting out of the valve due to the effect of limiting the position.

12. The invention provides a valve switch mechanism for a diaphragm valve, wherein the third limit structure comprises: the driving piece through set up on it the through-hole with the grafting is dismantled in the valve stem nut cooperation and is linked to each other, third limit structure includes: the valve rod nut is arranged on one side of the valve rod nut, which is close to the driving piece, and the first limiting bulge is abutted against the first limiting step, and/or the second limiting step is arranged in the valve cover, and the second limiting bulge is abutted against the second limiting step. Wherein first spacing arch be the retaining ring, the retaining ring butt be in first spacing step on, through first spacing step with first spacing arch, can prevent valve-stem nut, at rotatory in-process whereabouts to play a fastening, the effect of maintenance, above-mentioned retaining ring more importantly has the advantage of dismantling conveniently, convenience of customers dismouting valve-stem nut and valve rod. In addition, the valve cover is provided with a second limiting step and a second limiting bulge abutted against the second limiting step, so that the valve rod nut can be fastened, and the valve rod nut can be conveniently detached from the lower end of the valve cover, and the purpose of convenience in detachment is achieved.

13. The invention provides a valve switching mechanism for a diaphragm valve, wherein a first limiting bulge is a check ring sleeved on a valve rod nut, and the valve rod nut is provided with an annular accommodating groove matched and clamped with an inner ring of the check ring. Through the matching of the retaining ring and the inner ring of the annular containing groove on the valve rod nut, the purpose that the retaining ring is clamped and fixed with the inner ring of the annular containing groove can be achieved, and the retaining ring is prevented from sliding up and down with the valve rod nut.

14. The check ring is an elastic check ring provided with an opening, and the opening position of the check ring is provided with a mounting hole for changing the inner diameter of the check ring. The check ring is an elastic check ring with an opening, the check ring can be sleeved on the valve rod nut in the opening direction, in addition, a mounting hole for changing the inner diameter of the check ring is formed in the opening direction, a tool called a clamping and embedding tool is used for mounting, two tentacles on the clamping and embedding tool are respectively inserted into the mounting hole, the check ring is opened through operating calipers so as to be clamped into the groove, and the effect of facilitating the mounting of the check ring is achieved.

15. The present invention provides a diaphragm valve including: the valve opening and closing mechanism drives the valve rod nut to rotate through the rotating hand wheel in the diaphragm valve, and further drives the valve rod to push the diaphragm to close and open the fluid channel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a valve opening/closing mechanism according to the present invention;

FIG. 2 is a full sectional view of the valve opening and closing mechanism provided by the present invention;

FIG. 3 is a schematic perspective view of a driving member of the valve opening/closing mechanism according to the present invention;

FIG. 4 is a schematic perspective view of a valve stem nut of the valve opening and closing mechanism according to the present invention;

FIG. 5 is a schematic perspective view of a retainer ring of the valve opening and closing mechanism provided by the present invention;

FIG. 6 is a schematic view of a valve cover of the valve opening and closing mechanism according to the present invention;

description of reference numerals:

1-a valve stem; 2-valve cover; 3-valve stem nut; 4-a drive member; 5-valve core; 6-through holes; 7-a guide chute; 8-a guide slide block; 9-a membrane; 10-a first limit step; 11-a first limit projection; 12-an annular accommodating groove; 13-opening; 14-mounting holes; 17-a limit boss; 18-a limiting groove; 20-a projection; 21-a connector; 22-a second limit step; 23-a second stop lug; 24-annular extension.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.