High-frequency wear-resistant program control valve

Abstract

The utility model provides a high-frequency wear-resistant program control valve which comprises a valve body which is arranged in a sectional mode and connected in a sealed mode to form a valve cavity, and further comprises a valve ball, a valve rod and a valve rod, the valve rod is hermetically connected with the valve body, the lower end of the valve rod is in transmission connection with the valve ball, and the upper end of the valve rod extends out of the valve body to be connected with an external power unit; the valve seats are installed in the valve cavity, the two valve seats are symmetrically arranged and abut against the two sides of the valve ball respectively, and each valve seat comprises a valve seat body, an elastic piece pushing the valve seat body to move axially and sealing assemblies installed on the two sides of the elastic piece. The sealing assemblies are arranged on the two sides of the elastic piece of the valve seat, so that the elastic piece does not make contact with materials in the valve body, the function of stabilizing the working state of the elastic piece is achieved, and the problem that the sealing effect between the valve seat and the valve ball is reduced due to the fact that materials in the valve affect working of the elastic piece is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-frequency wear-resistant program-controlled valve. Background Art

[0002] A programmable valve is a shut-off valve driven by pneumatic, hydraulic or other means. It is widely used in pressure swing adsorption gas separation industries such as methanol cracking to produce hydrogen, alcohol drying, vinyl chloride concentration and recovery, polysilicon tail gas recovery, nitrogen production, oxygen production, and carbon dioxide recovery. Therefore, programmable valves require a large number of frequent actions, and the operating requirements and performance are higher than general valves.

[0003] Chinese patent CN109812595B discloses a high-frequency action program-controlled ball valve, specifically a high-frequency action program-controlled ball valve with a double-layer packing sealing structure, which belongs to the technical field of program-controlled ball valves. It includes a side valve body, a main valve body, a valve seat assembly, a valve ball and a valve stem. The upper opening of the main valve body is connected to the upper cover through a connector, and the upper cover presses the valve stem into the main valve body. The upper end of the upper cover is connected to the stuffing box; an upper shaft sleeve is provided between the upper part of the valve stem and the main valve body, and a lower shaft sleeve is provided between the lower part of the valve stem and the main valve body; a packing is provided between the stuffing box and the valve stem for sealing, and a graphite ring is provided between the upper cover and the valve stem for sealing, and the packing and the graphite ring are respectively located at the upper and lower ends of the upper shaft sleeve. The stuffing box seal in the invention is a double-layer redundant design, the packing is dynamically adjustable and compensated for the seal, and the valve stem meets the TALUFT emission standard for external leakage; shaft sleeves are provided on the upper and lower parts of the valve stem to decompose the lateral unbalanced force and effectively reduce the valve operating torque.

[0004] However, this technical solution has the following problems: first, the butterfly spring directly contacts the material in the valve during operation, which affects the normal operation of the butterfly spring and reduces the sealing effect between the valve seat and the valve ball; second, the sharp scraping tip on the valve seat has a certain cleaning effect, but under high-frequency operation it will cause damage to the valve ball and valve seat, affecting the service life. Utility Model Content

[0005] The purpose of the utility model is to provide a high-frequency, wear-resistant program-controlled valve in response to the deficiencies in the prior art. By arranging sealing components on both sides of the elastic part of the valve seat, the elastic part is prevented from contacting the material in the valve body, thereby achieving the function of stabilizing the working state of the elastic part and solving the problem that the material in the valve affects the operation of the elastic part and causes the sealing effect between the valve seat and the valve ball to be reduced.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A high-frequency wear-resistant program-controlled valve, comprising a valve body, wherein the valve body is arranged in sections and sealed to form a valve cavity, and further comprising:

[0008] A valve ball is installed in the valve cavity;

[0009] A valve stem is sealed and connected to the valve body, a lower end of which is drivingly connected to the valve ball, and an upper end of which extends out of the valve body and is connected to an external power unit;

[0010] The valve seat is installed in the valve cavity. The valve seat is symmetrically arranged in two groups and respectively abuts against the two sides of the valve ball. The valve seat includes a valve seat body, an elastic member that pushes the valve seat body to move axially, and a sealing assembly installed on both sides of the elastic member.

[0011] As a preference, the radial inner and outer sides of the sealing assembly are respectively in contact with the valve seat body and the valve body, and the sealing assembly comprises a first sealing member axially arranged on one side of the elastic member and a second sealing member on the other side.

[0012] As a preference, a first supporting ring is sandwiched between the first sealing member and the elastic member, and a second supporting ring is sandwiched between the second sealing member and the elastic member.

[0013] Preferably, the cross section of the first seal is a dovetail structure, and the outer side thereof is axially abutted against a third support ring, and the dovetail structure notch of the first seal faces the third support ring and is connected to the third support ring with a labyrinth seal.

[0014] As a preference, a fourth supporting ring is abutted against an inner side of the second sealing member, and a third sealing member is abutted against an inner side of the fourth supporting ring.

[0015] As a preference, the valve seat body is provided with a step, and the second support ring abuts against the step.

[0016] As a preferred embodiment, a sealing ring is further provided at the connection between the valve seat and the valve body.

[0017] As a preference, a fourth sealing member is provided at the connection between the valve seat and the valve ball.

[0018] As a preference, a packing assembly is coaxially arranged between the valve stem and the valve body.

[0019] As a preference, a protective layer is provided at the abutment portion between the valve ball and the valve seat.

[0020] The beneficial effects of the utility model are:

[0021] (1) The utility model symmetrically arranges the valve seat, cooperates with the elastic member and the sealing assembly, so that the valve seat can be closely abutted against both sides of the valve ball, has good sealing performance, and the leakage level reaches above level VI or zero leakage.

[0022] (2) The utility model provides a sealing assembly and multiple sealing members on both sides of the elastic member, thereby preventing the medium from entering the activity space of the elastic member, and a sealing ring is provided between the sealing member and the elastic member to prevent the elastic member from causing damage to the sealing member during frequent movements, thereby ensuring smooth and stable movement of the valve seat.

[0023] (3) The utility model improves the wear resistance of the valve ball and the valve seat by providing a protective layer at the abutment between the valve ball and the valve seat, effectively reduces the wear of the valve during high-frequency opening and closing, and extends the service life of the valve.

[0024] In summary, the utility model has the advantages of good sealing, stable operation and good wear resistance, and can meet the needs of high-frequency control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 For this utility model Figure 1 The local enlarged schematic diagram of point I in the middle;

[0027] Figure 3 This is a schematic diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] Embodiment 1

[0031] like Figure 1 , 2 As shown, this embodiment provides a high-frequency wear-resistant program-controlled valve, including a valve body 1, which is arranged in sections and sealed to form a valve cavity 11, and also includes: a valve ball 2, which is installed in the valve cavity 11; a valve stem 3, which is sealed and connected to the valve body 1, and its lower end is drivingly connected to the valve ball 2, and its upper end extends out of the valve body 1 and is connected to an external power unit; a valve seat 4, which is installed in the valve cavity 11, and the valve seat 4 is symmetrically arranged in two groups and respectively abuts on both sides of the valve ball 2, and includes a valve seat body 5, an elastic member 6 that pushes the valve seat body 5 to move axially, and a sealing assembly 7 installed on both sides of the elastic member 6. In this embodiment, the elastic member 6 is a butterfly spring.

[0032] It should be noted that the utility model is a fixed ball valve, and a rotating shaft is coaxially arranged at the lower end of the valve ball 2, which is mainly used to control the opening and closing of medium transportation pipelines such as powders and particles. When working, the utility model has a high action frequency, about once every 2 minutes, and the expected action life of the utility model is greater than 1 million times.

[0033] By symmetrically arranging the valve seat 4, cooperating with the elastic member 6 and the sealing assembly 7, the valve seat 4 can be closely abutted against both sides of the valve ball 2, with good sealing performance, and the leakage level reaches above level VI or zero leakage.

[0034] like Figure 1 , 2As shown, the radial inner and outer sides of the sealing assembly 7 are respectively abutted against the valve seat body 5 and the valve body 1, and the sealing assembly 7 comprises a first sealing member 71 axially arranged on one side of the elastic member 6 and a second sealing member 72 on the other side. A first support ring 73 is sandwiched between the first sealing member 71 and the elastic member 6, and a second support ring 74 is sandwiched between the second sealing member 72 and the elastic member 6. The cross section of the first sealing member 71 is a dovetail structure, and a third support ring 75 is axially abutted against the outer side thereof. The dovetail structure notch of the first sealing member 71 faces the third support ring 75 and is connected to the third support ring 75 in a labyrinth seal. A fourth support ring 76 is abutted against the inner side of the second sealing member 72, and a third sealing member 77 is abutted against the inner side of the fourth support ring 76.

[0035] By setting up the sealing assembly 7 and multiple sealing members on both sides of the elastic member 6, the medium can be prevented from entering the activity space of the elastic member 6, and a sealing ring is set between the seal and the elastic member 6 to avoid damage to the seal during frequent movements of the elastic member, thereby ensuring smooth and stable movement of the valve seat 4.

[0036] like Figure 2 As shown, the valve seat body 5 is provided with a step 51 , and the second support ring 74 abuts against the step 51 to transmit the force of the elastic member 6 .

[0037] like Figure 2 As shown, a sealing ring 41 is further provided at the connection between the valve seat 4 and the valve body 1 to further improve the sealing effect of the valve seat 4 .

[0038] like Figure 1 As shown, a packing assembly 8 is coaxially arranged between the valve stem 3 and the valve body 1. The packing assembly 8 is a prior art and plays a role in supporting the valve stem 3 and preventing material from leaking from the valve stem 3, which will not be described in detail here.

[0039] like Figure 2 As shown, a protective layer 9 is provided at the abutment portion between the valve ball 2 and the valve seat 4. The protective layer 9 is a hot-melt coating with a hardness ≥ HRC60.

[0040] By providing a protective layer 9 at the abutment between the valve ball 2 and the valve seat 4, the wear resistance of the valve ball 2 and the valve seat 4 is improved, the wear of the valve during high-frequency opening and closing is effectively reduced, and the service life of the valve is extended.

[0041] like Figure 2 As shown, the outer end of the valve seat body 4 and the corresponding inner wall of the valve body 1 are provided with a discharge slope 10 to prevent material accumulation from affecting the movement of the valve seat 4.

[0042] Embodiment 2

[0043] like Figure 3As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment is different from the first embodiment in that a fourth sealing member 42 is provided at the connection between the valve seat 4 and the valve ball 2, so that the valve seat 4 and the valve ball 2 are softly connected, and the wear of the contact part between the valve seat 4 and the valve ball 2 is further reduced while ensuring the sealing effect, thereby extending the service life of the utility model.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-frequency wear-resistant program-controlled valve, comprising a valve body, wherein the valve body is arranged in sections and sealed to form a valve cavity, characterized in that: Also includes: A valve ball is installed in the valve cavity; A valve stem is sealed and connected to the valve body, a lower end of which is drivingly connected to the valve ball, and an upper end of which extends out of the valve body and is connected to an external power unit; The valve seat is installed in the valve cavity. The valve seat is symmetrically arranged in two groups and respectively abuts against the two sides of the valve ball. The valve seat includes a valve seat body, an elastic member that pushes the valve seat body to move axially, and a sealing assembly installed on both sides of the elastic member.

2. A high-frequency wear-resistant program-controlled valve according to claim 1, characterized in that: The radial inner and outer sides of the sealing assembly are respectively in contact with the valve seat body and the valve body, and the sealing assembly includes a first sealing member axially arranged on one side of the elastic member and a second sealing member on the other side.

3. A high-frequency wear-resistant program-controlled valve according to claim 2, characterized in that: A first supporting ring is sandwiched between the first sealing member and the elastic member, and a second supporting ring is sandwiched between the second sealing member and the elastic member.

4. A high-frequency wear-resistant program-controlled valve according to claim 3, characterized in that: The cross section of the first sealing member is a dovetail structure, and the outer side thereof is axially abutted against the third support ring. The dovetail structure notch of the first sealing member faces the third support ring and is connected to the third support ring with a labyrinth seal.

5. A high-frequency wear-resistant program-controlled valve according to claim 3, characterized in that: The inner side of the second sealing member is in contact with a fourth supporting ring, and the inner side of the fourth supporting ring is in contact with a third sealing member.

6. A high-frequency wear-resistant program-controlled valve according to claim 3, characterized in that: The valve seat body is provided with a step, and the second support ring abuts against the step.

7. A high-frequency wear-resistant program-controlled valve according to claim 1, characterized in that: A sealing ring is also provided at the connection between the valve seat and the valve body.

8. A high-frequency wear-resistant program-controlled valve according to claim 1, characterized in that: A fourth sealing member is provided at the connection between the valve seat and the valve ball.

9. A high-frequency wear-resistant program-controlled valve according to claim 1, characterized in that: A packing assembly is coaxially arranged between the valve stem and the valve body.

10. A high-frequency wear-resistant program-controlled valve according to claim 1, characterized in that: A protective layer is provided at the abutment portion between the valve ball and the valve seat.

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