CN219345503U - Aseptic diaphragm type single seat valve structure - Google Patents

Abstract

The utility model relates to the technical field of food production equipment, in particular to a sterile diaphragm type single-seat valve structure, which comprises a valve body, a valve rod and a valve core, wherein the valve core is arranged in an inner cavity of the valve body; the edge of the diaphragm is positioned between the edge of the end cover and the edge of the top opening of the upper valve seat, the lower surface of the diaphragm is connected with the valve core, and the upper surface of the diaphragm is connected with the valve rod; the membrane is made by mixing ethylene propylene diene monomer rubber and organic fiber. The utility model enhances the tightness of the structure, effectively prevents the valve rod from polluting the inner cavity of the valve body, prolongs the service life of the structure and improves the use reliability.

Description

Aseptic diaphragm type single seat valve structure

Technical Field

The utility model relates to the technical field of food production equipment, in particular to a sterile diaphragm type single-seat valve structure.

Background

In the food production process, various fluid materials need to be guided and controlled to be switched on and off by various valves when transported through a pipeline, wherein a single valve is commonly used for realizing the control effect of the pipeline. Since the food industry generally requires aseptic production, it has a high requirement for the hygiene level of various production equipment components. In the traditional single-seat valve structure, the valve rod inevitably contacts with the outside in the telescoping process, so that pollution is easily caused to the inner cavity of the valve body, and the food safety is influenced.

As shown in fig. 13, the valve body in the structure of the single-seat valve with the conventional structure for controlling fluid transportation is provided with an upper chamber and a lower chamber which are communicated, and each chamber is provided with an independent interface to be connected with an external pipeline, so that the structure not only can carry out material transportation, but also can realize material mixing. The bottom opening of the lower valve seat 1' serves as a main material inlet or as a main material outlet. The valve rod 2' is connected with the cylinder 3' upwards and the valve core 4' downwards, and the valve core 4' isolates the upper cavity and the lower cavity or enables each opening to be communicated in the process of moving up and down along with the valve rod 2 '. Because the valve rod 2' of the structure is only provided with the shaft end sealing piece 5' on the outer wall of the rod body to ensure the sealing effect, the O-shaped sealing ring embedded into the end cover 7' at the top of the upper valve seat 6' is generally adopted as the shaft end sealing piece to realize the shaft end sealing effect, and therefore, the valve rod 2' arranged under the structure has the problem of polluting the inner cavity of the valve seat in the telescopic process. When the valve rod 2' moves upwards along with the retraction process of the cylinder telescopic rod, part of the rod body of the valve rod 2' is contacted with the outside, and when the valve rod 2' extends downwards along with the cylinder telescopic rod, part of the rod body which is contacted with the outside before enters the valve body cavity again. In this process, although the sealing effect is ensured by the shaft end sealing member 5', the deformation of the sealing member is compression elastic deformation, and the hidden danger of polluting the cavity after generating a gap is also brought in the process of volume change during deformation, so that the sanitary safety risk still exists, the requirement of aseptic production cannot be effectively ensured, the deformation amount of the sealing member is large, and the frequent compression release causes the material to be easy to fatigue and accelerate aging, so that the service life of the sealing member is shorter. In summary, the single seat valve of the conventional structure has the following disadvantages:

1) In the action process of the valve rod, the problem that the rod body spans the inside and the outside of the valve body cavity exists, so that the cavity is polluted;

2) The shaft end sealing piece is characterized by compression type elastic deformation, so that a gap is formed due to volume change caused by deformation in the action process of the valve rod, and the hidden danger of polluting a cavity exists;

3) The shaft end sealing piece has the problem of short service life due to the characteristics of deformation forms.

Disclosure of Invention

The utility model aims to provide a sterile diaphragm type single-seat valve structure which solves the technical problems.

The technical problems solved by the utility model can be realized by adopting the following technical scheme:

the sterile diaphragm type single-seat valve structure comprises a valve body, a valve rod and a valve core, wherein the valve core is arranged in an inner cavity of the valve body, the valve body is formed by stacking an upper valve seat and a lower valve seat up and down, the upper valve seat is communicated with the inner cavity of the lower valve seat, an end cover is arranged at the top of the upper valve seat, the valve rod is upwards connected with a cylinder above the upper valve seat and downwards penetrates through the end cover to be connected with the valve core, a diaphragm is arranged between the end cover and the upper valve seat, the diaphragm is in a disc-shaped structure and is downwards sunken in the center, a valve rod through hole is formed in the center of the diaphragm, and the valve rod downwards penetrates through the valve rod through hole and is connected with the valve core;

the edge of the diaphragm is positioned between the edge of the end cover and the edge of the top opening of the upper valve seat, and when the end cover is connected with the upper valve seat (here, the top opening of the upper valve seat) the edge of the diaphragm is fixed between the end cover and the upper valve seat;

the lower surface of the diaphragm is connected with the valve core, and the upper surface of the diaphragm is connected with the valve rod, so that when the valve rod and the valve core do lifting motion, the diaphragm is pulled to downwards sink and the latter is upwards sunk;

the membrane is made of Ethylene Propylene Diene Monomer (EPDM) and organic fibers.

The utility model adopts the diaphragm to replace the traditional O-shaped ring to realize the shaft seal effect, not only has better tightness, ensures that the valve rod exposed outside the valve body cavity can not enter the cavity during deformation, avoids pollution, but also has a compression deformation form superior to the O-shaped ring due to the characteristic of vibration elastic deformation of the diaphragm, has better service life and reliability of the structure, and is more suitable for the aseptic food production industry.

The diaphragm is provided with a reinforcing layer of Polytetrafluoroethylene (PTFE) covering the lower surface of the diaphragm facing the valve body chamber (i.e. the bottom surface of the diaphragm after installation). According to the utility model, the polytetrafluoroethylene with the same thickness is uniformly coated on the bottom surface of the diaphragm facing the valve body cavity, and then the diaphragm is formed into the reinforcing layer, and the polytetrafluoroethylene has the characteristics of better acid resistance, alkali resistance and resistance to various organic solvents, so that the durability of the diaphragm can be effectively enhanced after the reinforcing layer is formed.

The thickness of the reinforcing layer is 0.3 mm-0.5 mm. When the reinforcing layer is arranged on the bottom surface of the diaphragm, the diaphragm is not easy to be arranged too thick, so that the diaphragm is prevented from being influenced by elasticity. Preferably, the thickness of the reinforcing layer is 0.5mm.

The membrane is provided with a first positioning part which protrudes downwards from the lower surface of the membrane,

correspondingly, the valve core is provided with a first positioning groove, the first positioning groove is positioned on the upper end face of the valve core and is of a concave structure, so that when the valve core is assembled, the first positioning part is downwards inserted into the first positioning groove, and therefore the relative positioning and the interconnection of the valve core and the diaphragm are completed, and the diaphragm can be effectively prevented from shaking or laterally moving in the deformation process.

The first positioning parts are provided with at least two positioning grooves, and the first positioning grooves correspond to the first positioning parts one by one.

The first positioning part is of an annular protruding structure, and the first positioning groove is of an annular recessed structure.

The membrane is provided with a second positioning part which protrudes upwards from the upper surface of the membrane (namely the inner concave surface of the membrane after initial installation),

a sealing plate is arranged between the valve rod and the valve core, the sealing plate is covered on the upper surface of the diaphragm, a second positioning groove corresponding to the second positioning part is arranged on the lower surface of the sealing plate, and the second positioning part is inserted into the second positioning groove during assembly, so that the diaphragm is positioned, and side movement and shaking of the diaphragm are avoided;

the outer wall of the rod body of the valve rod is provided with a convex structure, and the convex structure is contacted with the upper surface of the sealing plate when the valve rod moves downwards, so that the diaphragm which is upwards concave is downwards pressed.

The upper end face of the valve core is provided with a jack which is convenient for the lower end of the valve rod to extend into.

The beneficial effects are that: by adopting the technical scheme, compared with the traditional structure, the utility model has the following advantages:

1) The action of the valve rod is synchronous with the deformation of the diaphragm, so that the part of the valve rod contacting the outside is positioned outside the cavity, the hidden danger of polluting the valve cavity is eliminated, and the food safety problem is avoided

2) The reciprocating (vibrating) deformation structural form of the diaphragm ensures that the shaft end of the whole structure has better tightness and is not easy to generate gaps;

3) The structural form of the reciprocating (vibrating) deformation of the diaphragm has better structural stability and longer service life.

Drawings

FIG. 1 is a schematic view of a first cross-sectional structure of the present utility model;

FIG. 2 is a schematic diagram of a second cross-sectional structure of the present utility model;

FIG. 3 is a schematic view of the upper valve seat of the present utility model;

FIG. 4 is a schematic illustration of the structure of the present utility model after the diaphragm and valve stem are connected;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is a schematic structural view of a sealing plate according to the present utility model;

FIG. 7 is a schematic view of the membrane of the present utility model from above;

FIG. 8 is a schematic view of the membrane of the present utility model from the bottom up;

FIG. 9 is a schematic cross-sectional view of a diaphragm of the present utility model;

FIG. 10 is a schematic view of a valve cartridge according to the present utility model;

FIG. 11 is a schematic perspective view of the present utility model;

FIG. 12 is a schematic view of the structure of the present utility model from a front view;

fig. 13 is a schematic view of a single seat valve of conventional construction.

Detailed Description

In order that the manner in which the utility model is practiced, as well as the features and objects and functions thereof, will be readily understood and appreciated, the utility model will be further described in connection with the accompanying drawings. It should be noted that the terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements or units is not necessarily limited to those elements or units that are expressly listed or inherent to such product or apparatus, but may include other elements or units not expressly listed or inherent to such product or apparatus.

Referring to fig. 1, 2, 11 and 12, the aseptic diaphragm type single-seat valve structure comprises a valve body, a valve rod 2 and a valve core 3, wherein the valve core 3 is arranged in an inner cavity of the valve body, and the valve body is formed by stacking two valve seats up and down and comprises an upper valve seat 101 and a lower valve seat 102. Each valve seat is provided with an upper opening, a lower opening and a side wall opening. The upper valve seat 101 is communicated with the inner cavity of the lower valve seat 102, the top of the upper valve seat 101 is provided with an end cover 4, the valve rod 2 is upwards connected with the cylinder 5 above the upper valve seat, and the valve rod passes through the end cover 4 downwards and then is connected with the valve core 3.

A diaphragm 6 is arranged between the end cover 4 and the upper valve seat 101, the diaphragm 6 is in a disc-shaped structure, the center of the diaphragm is recessed downwards, as shown in fig. 7 and 8, a valve rod through hole 6001 is arranged at the center of the diaphragm, and the valve rod 2 passes through the valve rod through hole 6001 downwards and then is connected with the valve core 3;

the edge of the diaphragm 6 is positioned between the edge of the end cover 4 and the edge of the top opening of the upper valve seat 101, and when the end cover 4 is connected with the upper valve seat 101, the edge of the diaphragm 6 is fixed between the end cover 4 and the upper valve seat 101;

the lower surface of the diaphragm 6 is connected with the valve core 3, and the upper surface is connected with the valve rod 2, so that when the valve rod 2 and the valve core 3 do lifting motion, the diaphragm 6 is pulled to be downwards concave and the latter is upwards concave.

In the utility model, the upper and lower surfaces of the diaphragm are respectively connected with the valve rod and the valve core, and the valve core is arranged as a valve core lower part and a valve core upper part, wherein the valve core lower part contacts with the lower opening edge of the lower valve seat or contacts with the upper opening edge of the lower valve seat to generate a sealing effect when moving up and down, and the valve core upper part is used for being connected with the valve rod upwards. The junction of case upper portion and valve pole is located the valve rod through-hole department of diaphragm.

In addition, the valve rod can also be arranged to directly penetrate through the valve rod through hole of the diaphragm downwards and then be connected with the valve core, and the valve core structure can be regarded as only having the lower part of the valve core and not having the lower part of the valve core; at this time, the lower surface of the diaphragm may be regarded as being indirectly connected to the valve core through the lower portion of the valve stem penetrating the valve stem through-hole. Under this structure setting, when the diaphragm is not atress, valve rod lower part is located in the valve cavity, in order to ensure that it remains valve rod lower part in valve cavity throughout the whole action of valve rod, the relative position of valve rod and diaphragm is fixed through clamping structure such as jump ring or pipe clamp.

The membrane 6 is made of Ethylene Propylene Diene Monomer (EPDM) and organic fibers. Among them, aramid is preferably used as the organic fiber.

In the structure shown in fig. 1, the diaphragm is in a concave state, which can be regarded as no stress, and in the structure shown in fig. 2, the diaphragm is in an concave state, which can be regarded as deformation caused by upward force.

The initial structure of the diaphragm is a concave structure facing one side, so that it is convex when viewed from the opposite side. When the diaphragm is assembled between the end cover 4 and the upper valve seat 101, the bulge of the diaphragm can be arranged to face downwards to the inner cavity of the valve body, and after the diaphragm is acted by an upward external force, the diaphragm is in an upward concave structure, namely in an upward convex shape, so that the deformation form of the diaphragm is in a vibrating deformation form, the deformation has reciprocability, and the diaphragm structure is not easy to damage. When the lower protrusion is concave to the limit position during assembly, as shown in fig. 1, it is required to ensure that the lower end of the valve core 3 contacts the lower opening of the lower valve seat 102, and when the diaphragm 6 is concave (can be considered to be convex upwards) to the limit position after being deformed by the rising traction of the valve core 3 or the valve rod 2, as shown in fig. 2, the valve core 3 is blocked between the chamber of the lower valve seat 102 and the chamber of the upper valve seat 101.

The upper and lower valve seats of the present utility model may be connected to each other by a flange connection structure, and for this purpose, as shown in fig. 3, the edges of the upper and lower openings of either valve seat are provided with flanges, including an upper flange 1001 and a lower flange 1002. The lower flange of the upper valve seat and the upper flange of the lower valve seat are tightly attached to each other and then are in flange connection.

The present utility model is to enhance the sterility exhibited by the film sheet, and may be provided as follows: in some embodiments, as shown in fig. 9, the bottom surface (protruding downwards) of the diaphragm 6 is provided with a reinforcing layer 8 made of Polytetrafluoroethylene (PTFE), the reinforcing layer 8 covers the whole bottom surface of the diaphragm 6, and the bottom surface is positioned at the top of the valve body cavity.

In some of these embodiments, the thickness of the reinforcing layer 8 is set to 0.3mm to 0.5mm. When the reinforcing layer is arranged on the bottom surface of the diaphragm, the diaphragm is not easy to be arranged too thick so as to prevent the diaphragm from influencing the elasticity of the diaphragm, and is not easy to be arranged too thin, so that the reinforcing effect of the reinforcing layer is prevented from being invalid due to peeling off during use or abrasion caused by too thin adhesive force.

In some preferred embodiments, the thickness of the reinforcing layer 8 is set to 0.5mm, that is, the reinforcing layer is formed by uniformly coating the bottom surface of the membrane 6 with polytetrafluoroethylene of 0.5mm, and then a better reinforcing effect is exerted.

The utility model can be arranged according to the following structure in order to make the installation of the membrane firmer: as shown in fig. 9, the diaphragm 6 has a first positioning portion 601, the first positioning portion 601 protrudes downward from the bottom surface of the diaphragm 6 (i.e., the lower surface of the diaphragm),

correspondingly, as shown in fig. 10, the valve core 3 is provided with a first positioning groove 301, the first positioning groove 301 is located on the upper end face of the valve core 3 and is in a concave structure, so that when the valve core is assembled, the first positioning part 601 is downwards inserted into the first positioning groove 301, and therefore the relative positioning and interconnection of the valve core 3 and the diaphragm 6 are completed, and shaking or lateral movement of the diaphragm 6 in the deformation process can be effectively avoided.

The outer surface of the first positioning portion 601 is also provided with a reinforcing layer 8.

In some embodiments, at least two first positioning portions are provided, and the first positioning grooves are in one-to-one correspondence with the first positioning portions (the drawings of the present utility model show that the structure is not provided with the structure).

In other embodiments, as shown in fig. 8 and 9, the first positioning portion 601 is an annular protrusion structure, the annular protrusion structure is closed after surrounding the bottom surface of the diaphragm, and correspondingly, as shown in fig. 10, the first positioning groove 301 is an annular recess structure, and the annular recess structure is closed after surrounding the upper surface of the valve core.

The utility model is convenient for installing and fixing the membrane, and can be arranged according to the following structure: as shown in fig. 7, the diaphragm 6 has a second positioning portion 602, the second positioning portion 602 protrudes upward from the upper surface of the diaphragm 6 (i.e., the bottom surface of the diaphragm after initial installation),

a sealing plate 7 is arranged between the valve rod 2 and the valve core 3, the sealing plate 7 is covered on the upper surface of the diaphragm 6, as shown in fig. 6, a through hole which is convenient for the valve rod to pass through is arranged in the center of the sealing plate 7, a second positioning groove 701 corresponding to the second positioning part 602 is arranged on the lower surface of the sealing plate 7, and when the valve rod is assembled, the second positioning part 602 is inserted into the second positioning groove 701, so that the positioning of the diaphragm 6 is realized, the positioning of the diaphragm is reinforced, the rotation trend of the diaphragm during deformation is avoided, and the deformation process is more stable;

as shown in fig. 4 and 5, the outer wall of the stem of the valve stem 2 is provided with a convex structure 201, and the convex structure 201 contacts with the upper surface of the sealing plate 7 when the valve stem 2 moves down, thereby pressing the diaphragm 6 in an upward concave downward manner.

It should be noted that the male structure 201 may be configured as a detachable structure, for example, screwed to the stem of the valve stem 2 by using a nut. For this purpose, the stem of the valve stem 2 may be provided with external threads for a nut, so that the sealing plate 7 is fastened to the upper surface of the diaphragm when the nut is screwed.

The utility model is convenient for connecting the valve core and the valve rod, and can be arranged according to the following structure: as shown in fig. 10, the upper end surface of the valve core 3 is provided with a receptacle 302 into which the lower end of the valve stem 2 is inserted. The key groove or the internal thread can be arranged in the jack 302, and the other key groove or the external thread is arranged on the outer wall of the rod body matched with the lower end of the valve rod 2, so that the valve core 3 and the valve rod 2 can be in key connection or threaded connection. Similarly, the connection between the upper end of the valve rod 2 and the telescopic rod of the cylinder can be implemented according to the structure. In addition, spline connection can also be adopted between the valve rod and the cylinder telescopic rod.

In summary, the diaphragm replaces the traditional O-shaped ring to achieve the shaft seal effect, so that the sealing performance is better, the leakage risk is avoided during deformation, and the diaphragm has a compression deformation form superior to that of the O-shaped ring due to the characteristic of vibration elastic deformation, and the structure is good in service life and reliability.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (8)

1. The sterile diaphragm type single-seat valve structure comprises a valve body, a valve rod and a valve core, wherein the valve core is arranged in an inner cavity of the valve body, the valve body is formed by stacking an upper valve seat and a lower valve seat up and down, the upper valve seat is communicated with the inner cavity of the lower valve seat, an end cover is arranged at the top of the upper valve seat, the valve rod is upwards connected with a cylinder above the upper valve seat and downwards penetrates through the end cover to be connected with the valve core, and the sterile diaphragm type single-seat valve structure is characterized in that a diaphragm is arranged between the end cover and the upper valve seat, the diaphragm is in a disc-shaped structure and is downwards sunken in the center, a valve rod through hole is formed in the right center position of the diaphragm, and the valve rod downwards penetrates through the valve rod through hole and is connected with the valve core;

the edge of the diaphragm is positioned between the edge of the end cover and the edge of the top opening of the upper valve seat, and when the end cover is connected with the upper valve seat, the edge of the diaphragm is fixed between the end cover and the upper valve seat;

the lower surface of the diaphragm is connected with the valve core, and the upper surface of the diaphragm is connected with the valve rod, so that when the valve rod and the valve core do lifting motion, the diaphragm is pulled to downwards sink and the latter is upwards sunk;

the membrane is prepared by mixing ethylene propylene diene monomer rubber and organic fibers.

2. A sterile diaphragm type single-seat valve structure according to claim 1, wherein the diaphragm is provided with a reinforcing layer made of polytetrafluoroethylene, which covers the lower surface of the diaphragm facing the valve body chamber.

3. The aseptic diaphragm type single seat valve structure according to claim 2, wherein the thickness of the reinforcement layer is 0.3mm to 0.5mm.

4. A sterile diaphragm type single-seat valve structure according to claim 1, 2 or 3, wherein said diaphragm has a first positioning portion protruding downward from a lower surface of said diaphragm,

correspondingly, the valve core is provided with a first positioning groove, and the first positioning groove is positioned on the upper end face of the valve core and is in a concave structure.

5. The aseptic diaphragm type single seat valve structure according to claim 4, wherein the first positioning portions are provided with at least two, and the first positioning grooves are in one-to-one correspondence with the first positioning portions.

6. The aseptic diaphragm type single-seat valve structure according to claim 4, wherein the first positioning portion has an annular protrusion structure, and the corresponding first positioning groove has an annular recess structure.

7. The aseptic diaphragm type single seat valve structure according to claim 1, wherein the diaphragm has a second positioning portion protruding upward from an upper surface of the diaphragm,

a sealing plate is arranged between the valve rod and the valve core, the sealing plate is covered on the upper surface of the diaphragm, and a second positioning groove corresponding to the second positioning part is arranged on the lower surface of the sealing plate;

the outer wall of the rod body of the valve rod is provided with a convex structure, and the convex structure is contacted with the upper surface of the sealing plate when the valve rod moves downwards.

8. The aseptic diaphragm type single-seat valve structure according to claim 7, wherein the upper end surface of the valve core is provided with a jack into which the lower end of the valve rod is conveniently inserted.

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