CN111237539A - Valve rod and valve plug connecting structure and assembling method - Google Patents

Abstract

The invention provides a valve rod and valve plug connecting structure and an assembling method, which are used for solving the problem of reliability of a valve with the valve plug and valve rod connecting structure in the prior art. The present invention provides a valve stem and plug connecting structure, comprising: the valve plug is provided with an inner hole, the inner wall of the inner hole is provided with an axial groove along the axial direction, one end of the axial groove in the axial direction is flush with the orifice of the inner hole, and the axial length of the axial groove in the axial direction is smaller than that of the inner hole; valve rod, including big axial region and little axial region, big axial region with little axial region forms first step, and little axial region can pass the hole just big axial region card is in outside the hole, be equipped with the external screw thread on the little axial region, be equipped with the holding tank on the little axial region, the holding tank embeds there is the screens piece, the nut, be used for with little axial region the external screw-thread fit, the nut is including only changeing the structure, only changeing the structure and being used for the restriction the displacement of rotation of nut. Has the characteristic of high reliability.

Description

Valve stem valve plug connection structure and assembly method

technical field

The invention relates to the field of valves, in particular to a valve stem valve plug connection structure and an assembling method.

Background technique

The traditional valve plug and valve stem are connected and fixed by thread and welding. The valve stem is machined with a guide structure and the end is machined with external threads. The valve plug is machined with a guide step hole, and the end is machined with an internal thread. Insert the valve stem into the valve plug, tighten the thread, and weld at the end to achieve the purpose of fixing the valve plug and valve stem.

The above design mainly relies on welding to fix the two parts. During welding, the valve stem will be deformed due to heating, which will cause the deviation of the coaxiality between the right end of the valve stem and the valve plug, especially when the valve stem is relatively long, the coaxiality deviation will be larger. At the same time, the performance of the weld is affected by too many factors, such as the level of the welding operator, the influence of the material composition of the parts, the influence of the composition of the welding consumables, the corrosion of the weld on the spot by the medium (the chemical industry is extremely serious), which seriously affects the long-term stability of the structure. and reliability. If there is a problem with this connection, it will cause the valve to fail, affecting on-site production and safety.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a valve stem valve plug connection structure and an assembling method, which are used to solve the valve reliability problem of the valve plug and valve stem connection structure in the prior art.

In order to achieve the above purpose and other related purposes, the present invention provides a valve stem valve plug connection structure, the valve stem valve plug connection structure includes:

The valve plug is provided with an inner hole, the inner wall of the inner hole is provided with an axial groove in the axial direction, and one end of the axial groove is flush with the inner hole orifice in the axial direction, and the shaft The axial length of the groove is smaller than the axial length of the inner hole;

A valve stem, the valve stem includes a large shaft portion and a small shaft portion, the large shaft portion and the small shaft portion form a first step, the small shaft portion can pass through the inner hole and the large shaft portion It is clamped outside the inner hole, the small shaft part is provided with an external thread, the small shaft part is provided with an accommodating groove, and the accommodating groove is provided with a clamping part, when the small shaft part penetrates the When the inner hole is located, the retaining member can be along the axial groove and be clamped at the axial groove bottom position of the axial groove;

The nut is used to cooperate with the external thread of the small shaft portion, and the nut includes a rotation-stop structure, and the rotation-stop structure is used to limit the rotational displacement of the nut.

Optionally, the positioning member is a spherical structure, the axial groove is an arc-shaped groove, and the inner wall of the receiving groove is a cylindrical surface structure.

Optionally, the nut includes a body portion and an annular protruding portion, the inner side of the body portion is provided with a first central hole, the annular protruding portion and the body portion are coaxially fixed, and the inner side of the annular protruding portion is is a second central hole, the first central hole and the second central hole are both threaded holes, or only the first central hole is a threaded hole, and the annular protrusion can be deformed;

An anti-rotation groove is provided on the small shaft portion, and the annular protruding portion can be deformed under the action of an external force and is partially embedded in the anti-rotation groove.

Optionally, the wall thickness of the annular protrusion is 0.5-1 mm.

Optionally, the anti-rotation groove includes a first inclined groove and a second inclined groove, and the first inclined groove and the second inclined groove are inclined in a forward rotation direction and a reverse rotation direction, respectively.

Optionally, a groove depth of one end of the anti-rotation groove close to the end of the valve stem is greater than a groove depth of a portion of the anti-rotation groove extending toward the other end.

Optionally, a groove depth of one end of the anti-rotation groove close to the end of the valve stem is equal to a groove depth of a portion of the anti-rotation groove extending toward the other end.

Optionally, the partial groove depth or the entire groove depth of the anti-rotation groove is greater than the tooth depth of the external thread.

Optionally, the small shaft portion includes a first small shaft and a second small shaft, the diameter of the first small shaft is smaller than the diameter of the second small shaft, and the diameter of the second small shaft is smaller than the diameter of the large shaft. the diameter of the shaft;

The inner hole is a stepped hole, and the inner hole includes a large hole and a small hole. When the small shaft part penetrates the inner hole, the first small shaft passes through the small hole, and the second small shaft passes through the small hole. The small shaft penetrates the large hole, and the length of the second small shaft is less than the axial length of the large hole;

The accommodating groove is arranged on the first small shaft.

A method for assembling a valve stem valve plug connection structure, comprising the following steps:

Adjust the position of the valve plug so that the axial groove is located on the upper side of the inner hole;

Adjust the posture of the valve stem so that the notch of the accommodating groove faces upwards, and put the clamping piece into the accommodating groove;

The clamping part is aligned with the position of the axial groove, and the valve rod is inserted into the inner hole axially until the end face of the large shaft part contacts with the end face of the valve plug;

The nut is screwed in from the end of the valve stem and locked by the anti-rotation structure.

As described above, the valve stem valve plug connection structure and assembling method of the present invention have at least the following beneficial effects:

Through the stepped structure of the valve stem, the displacement limitation of the valve stem in one direction in the axial direction is realized, and the displacement limitation of the valve stem in the other direction is realized by the cooperation of the nut and the valve stem. The restriction of the rotational displacement of the valve stem, and the cooperation of the axial groove, the clamping piece and the accommodating groove enables only one accommodating groove on the valve stem to realize the rotational displacement limitation, so that the valve stem can ensure better structural strength, thereby The reliability is improved, and the solution does not need welding in the whole process, which can avoid unreliable factors caused by welding, and effectively solve the problem of reliability of the valve in the connection structure between the valve plug and the valve stem in the prior art.

Description of drawings

FIG. 1 is a schematic diagram showing the connecting structure of the valve stem and valve plug of the present invention.

Figure 2 shows a cross-sectional view of the valve plug of the present invention.

Figure 3 shows an end view of the valve plug and valve stem assembly of the present invention.

Figure 4 shows a schematic view of the valve stem of the present invention.

FIG. 5 is a schematic view of the anti-rotation groove of the valve stem of the present invention.

Figure 6 shows a schematic view of a nut of the present invention.

Component number description: valve plug 1, valve stem 2, nut 3, inner hole 11, axial groove 111, large shaft part 21, small shaft part 22, external thread 221, accommodating groove 222, locking piece 2221, body part 31 , annular protrusion 32, first central hole 311, second central hole 321, first oblique groove 2231, second oblique groove 2232, first small shaft 224, second small shaft 225, large hole 112, small hole 113 .

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

See Figures 1 to 6. It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with this technology, and are not used to limit the conditions that the present invention can be implemented. Therefore, without technical substantive significance, any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope disclosed in the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. within the scope of technical content. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

The following examples are for illustration only. Combinations can be made between the various embodiments, which are not limited to the contents presented in the following single embodiment.

Referring to FIGS. 1 to 4 , the present invention provides an embodiment of a valve stem valve plug connection structure. The valve stem valve plug connection structure includes: a valve plug 1 , a valve stem 2 and a nut 3 . The valve plug 1 is provided with There is an inner hole 11, and the inner wall of the inner hole 11 is provided with an axial groove 111 in the axial direction. The axial length is smaller than the axial length of the inner hole 11; the valve stem 2 includes a large shaft portion 21 and a small shaft portion 22, and the large shaft portion 21 and the small shaft portion 22 form a first Steps, the small shaft portion 22 can pass through the inner hole 11 and the large shaft portion 21 is clamped outside the inner hole 11, the small shaft portion 22 is provided with an external thread 221, and the small shaft portion 22 is provided with an accommodating groove 222, and the accommodating groove 222 has a built-in latching member 2221. When the small shaft portion 22 penetrates the inner hole 11, the latching member 2221 can move along the axial groove. 111 and stuck at the axial bottom position of the axial groove 111; the nut 3 is used to cooperate with the external thread 221 of the small shaft portion 22, the nut 3 includes a rotation-stop structure, and the The anti-rotation structure is used to limit the rotational displacement of the nut 3 . Through the stepped structure of the valve stem 2, the displacement limitation of the valve stem 2 in one direction in the axial direction is realized, and the displacement limitation of the valve stem 2 in the other direction is realized by the cooperation of the nut 3 and the valve stem 2. The cooperation with the accommodating groove 222 realizes the restriction of the rotational displacement of the valve stem 2 , and the cooperation of the axial groove 111 , the retaining member 2221 and the accommodating groove 222 enables only one accommodating groove 222 on the valve stem 2 to realize the rotational displacement. Limitation, so that the valve stem 2 can ensure better structural strength, thereby improving reliability, and this solution does not require welding in the whole process, which can avoid unreliable factors caused by welding, and effectively solve the valve plug 1 and valve stem 2 in the prior art. Connection structure valve reliability issues.

In this embodiment, please refer to FIG. 1 and FIG. 2 , the retaining member 2221 is a spherical structure, specifically a steel ball, the axial groove 111 is an arc-shaped groove, and the inner wall of the accommodating groove 222 is a cylindrical surface structure. The cylindrical surface structure is easy to process and has higher assembly accuracy, and can still be assembled successfully under a small assembly gap, thereby ensuring the accuracy of the limiting structure of the valve stem 2 on the rotational displacement.

In this embodiment, please refer to FIG. 6 , the nut 3 includes a body portion 31 and an annular protruding portion 32 , the inner side of the main body portion 31 is provided with a first central hole 311 , the annular protruding portion 32 and the body The inner side of the annular protrusion 32 is a second center hole 321, both the first center hole 311 and the second center hole 321 are threaded holes, or only the first center hole 311 is a threaded hole, the annular protruding portion 32 can be deformed; the small shaft portion 22 is provided with an anti-rotation groove 223, the annular protruding portion 32 can be deformed under the action of external force and partially embedded in the anti-rotation in groove 223. Under the action of external force, it is deformed and embedded into the anti-rotation groove 223, and specifically, it can be operated by an external tool similar to a clamp structure. When the deformed portion of the annular protrusion 32 is embedded in the anti-rotation groove 223, the rotational displacement of the nut 3 is restricted, so as to prevent the valve from rotating during use, thereby achieving higher reliability.

In this embodiment, please refer to FIG. 6 , the wall thickness of the annular protruding portion 32 is 0.5-1 mm. While ensuring the strength of the anti-rotation structure, it also ensures that the annular protrusion 32 can be deformed under the action of external force. If the thickness is too thick, a larger force is required to deform it, resulting in inconvenient assembly.

In this embodiment, please refer to FIG. 5 , the anti-rotation groove 223 includes a first inclined groove 2231 and a second inclined groove 2232 , the first inclined groove 2231 and the second inclined groove 2232 are respectively in the forward rotation direction and tilted in the anti-rotation direction. Through the design of the first oblique groove 2231 and the second oblique groove 2232, it can limit the rotation of the nut 3 in the forward and reverse directions, and the oblique groove structure can make the annular protrusion 32 more easily deformed and embedded in the oblique groove. Inside.

In this embodiment, please refer to FIG. 5 , the groove depth of one end of the anti-rotation groove 223 close to the end of the valve stem 2 is greater than the groove depth of the extending portion of the anti-rotation groove 223 toward the other end. This structure can make the annular protruding portion 32 partially deformed, and partially deformed, so that it is easier to save labor when applying external force to the annular protruding portion 32, and at the same time, the limiting effect can be ensured. In Fig. 5, the solution adopted is a gradual structure, the groove depth is the deepest at one end near the end of the valve stem 2, and then the anti-rotation groove 223 of the extending part in the direction of the other end gradually becomes shallower, and only needs to be used during manufacture. The milling cutter can be manufactured with a single slant cut, and the processing is convenient.

In this embodiment, the groove depth of one end of the anti-rotation groove 223 close to the end of the valve stem 2 is equal to the groove depth of the extending portion of the anti-rotation groove 223 toward the other end.

In this embodiment, please refer to FIG. 5 , the partial groove depth or the entire groove depth of the anti-rotation groove 223 is larger than the tooth depth of the external thread 221 . It has better card position effect.

In this embodiment, please refer to FIG. 1 and FIG. 4 , the small shaft portion 22 includes a first small shaft 224 and a second small shaft 225 , the diameter of the first small shaft 224 is smaller than the diameter of the second small shaft 225 , The diameter of the second small shaft 225 is smaller than the diameter of the large shaft portion 21 ; the inner hole 11 is a stepped hole, and the inner hole 11 includes a large hole 112 and a small hole 113 . When the inner hole 11 is described, the first small shaft 224 passes through the small hole 113, the second small shaft 225 passes through the large hole 112, and the length of the second small shaft 225 is smaller than the large hole 112; the accommodating groove 222 is provided on the first small shaft 224. The small shaft portion 22 is divided into a first small shaft 224 and a second small shaft 225, and the inner hole 11 includes a large hole 112 and a small hole 113. The first small shaft 224 is provided with the external thread 221, and the external thread 221 is processed. When machining with the inner hole 11, due to the existence of machining errors, the outer thread 221 cannot enter the inner hole 11, through the arrangement of the large hole 112 and the small hole 113, so that even if the outer thread 221 and the inner hole 11 have a certain range of machining The error exists, it only needs to ensure that the external thread 221 can pass through the small hole 113, and the machining accuracy requirement at the position of the large hole 112 is reduced, thereby reducing the difficulty of machining.

A method for assembling a connecting structure of valve stem 2 valve plug 1, comprising the following steps:

Adjust the position of the valve plug 1 so that the axial groove 111 is located on the upper side of the inner hole 11;

Adjust the posture of the valve stem so that the notch of the accommodating groove 222 faces upwards, and put the locking member 2221 into the accommodating groove 222;

The retaining member 2221 is aligned with the position of the axial groove 111, and the valve stem is axially inserted into the inner hole 11 until the end face of the large shaft portion 21 contacts the end face of the valve plug 1;

The nut 3 is screwed in from the end of the valve stem and locked by the anti-rotation structure.

This assembly method can be assembled without welding participation, which ensures the reliability of the valve.

To sum up, the present invention realizes the displacement limitation of the valve stem 2 in one direction in the axial direction through the stepped structure of the valve stem 2, and realizes the displacement limitation of the valve stem 2 in the other direction through the cooperation of the nut 3 and the valve stem 2. The cooperation of the groove 111 , the retaining member 2221 and the accommodating groove 222 realizes the restriction of the rotational displacement of the valve stem 2 , and the cooperation of the axial groove 111 , the retaining member 2221 and the accommodating groove 222 enables only one accommodating groove to be opened on the valve stem 2 The groove 222 can realize rotational displacement limitation, so that the valve stem 2 can ensure better structural strength, thereby improving reliability, and this solution does not require welding in the whole process, which can avoid unreliable factors caused by welding, and effectively solve the problem in the prior art. The reliability of the valve in the connection structure of the valve plug 1 and the valve stem 2. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A valve stem and plug connection, comprising:

the valve plug is provided with an inner hole, the inner wall of the inner hole is provided with an axial groove along the axial direction, one end of the axial groove in the axial direction is flush with the orifice of the inner hole, and the axial length of the axial groove in the axial direction is smaller than that of the inner hole;

the valve rod comprises a large shaft part and a small shaft part, the large shaft part and the small shaft part form a first step, the small shaft part can penetrate through the inner hole, the large shaft part is clamped outside the inner hole, the small shaft part is provided with an external thread, the small shaft part is provided with a containing groove, a clamping part is arranged in the containing groove, and when the small shaft part penetrates into the inner hole, the clamping part can be clamped at the axial groove bottom position of the axial groove along the axial groove;

the nut is used for being matched with the external thread of the small shaft part, the nut comprises a rotation stopping structure, and the rotation stopping structure is used for limiting the rotation displacement of the nut.

2. The valve stem plug connection of claim 1, wherein: the screens piece is the spheroid structure, the axial slot is the arc wall, the holding tank inner wall is face of cylinder structure.

3. The valve stem plug connection of claim 1, wherein: the nut comprises a body part and an annular protrusion part, wherein a first central hole is formed in the inner side of the body part, the annular protrusion part and the body part are coaxially fixed, a second central hole is formed in the inner side of the annular protrusion part, the first central hole and the second central hole are both threaded holes, or only the first central hole is a threaded hole, and the annular protrusion part can deform;

the small shaft part is provided with a rotation stopping groove, and the annular protruding part can deform under the action of external force and is partially embedded into the rotation stopping groove.

4. The valve stem plug connection of claim 3, wherein: the wall thickness of the annular bulge is 0.5-1 mm.

5. The valve stem plug connection of claim 3, wherein: the rotation stopping groove includes a first inclined groove and a second inclined groove, and the first inclined groove and the second inclined groove are respectively inclined in a forward rotation direction and a reverse rotation direction.

6. The valve stem plug connection of claim 5, wherein: the groove depth of one end of the rotation stopping groove close to the end part of the valve rod is larger than the groove depth of the extending part of the rotation stopping groove towards the other end.

7. The valve stem plug connection of claim 5, wherein: the groove depth of one end of the rotation stopping groove close to the end part of the valve rod is equal to the groove depth of the extending part of the rotation stopping groove towards the other end.

8. The valve stem plug connection according to any one of claims 3 to 7, wherein: the partial groove depth or the whole groove depth of the rotation stopping groove is larger than the tooth depth of the external thread.

9. The valve stem plug connection of claim 1, wherein: the small shaft part comprises a first small shaft and a second small shaft, the diameter of the first small shaft is smaller than that of the second small shaft, and the diameter of the second small shaft is smaller than that of the large shaft part;

the inner hole is a stepped hole and comprises a large hole and a small hole, when the small shaft part penetrates into the inner hole, the first small shaft penetrates through the small hole, the second small shaft penetrates into the large hole, and the length of the second small shaft is smaller than the axial length of the large hole;

the accommodating groove is formed in the first small shaft.

10. A method of assembling a valve stem plug coupling structure according to any one of claims 1 to 9, comprising the steps of:

adjusting the placing posture of the valve plug to enable the axial groove to be positioned on the upper side of the inner hole;

adjusting the posture of the valve rod to enable the notch of the accommodating groove to be upward, and placing the clamping piece into the accommodating groove;

the clamping piece is aligned to the axial groove position, and the valve rod is axially inserted into the inner hole until the end face of the large shaft part is contacted with the end face of the valve plug;

and screwing a nut from the end part of the valve rod and locking the nut through a rotation stopping structure.

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