Rolling diaphragm and gas pressure regulator
By setting a preset angle between the inner wall and the axis direction of the diaphragm on the rolling diaphragm and sealing it with the interference between the inner wall and the bracket, the problems of unstable movement and unstable pressure regulation accuracy of the rolling diaphragm are solved, and a higher service life and a more stable pressure regulation effect are achieved.
Patent Information
- Application Number
- CN202421707245.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-18
AI Technical Summary
Conventional rolling diaphragms are prone to wrinkles and damage during movement, resulting in leakage and waste of energy, and poor fit with the bracket, resulting in unstable pressure regulation accuracy.
A rolling diaphragm is designed, with its inner wall and the axis direction of the diaphragm at a preset angle, and the interference between the inner wall and the bracket plays a sealing role, ensuring the stability of the diaphragm path and reducing the risk of wear and leakage.
It effectively solves the problem that the rolling diaphragm path cannot be restricted, reduces the risk of diaphragm wear and leakage during long-term operation, and ensures the stability of pressure regulation accuracy.
Smart Images
Figure CN222848757U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas pressure regulating equipment, and further relates to a rolling diaphragm and a gas pressure regulator. Background Art
[0002] The gas pressure regulator is a pneumatic component combination device driven by a diaphragm + spring. It controls the valve opening by sensing pressure through an elastic diaphragm and achieving balance with the spring loading force. The key performance indicators of the pressure regulator include: adjustment accuracy, closing pressure level, flow coefficient, etc. The test results of the key performance indicators determine the effective application range of the pressure regulator, including the accuracy range of the adjustment pressure, the accuracy level of the closing pressure, and the effective flow range within the adjustment pressure accuracy range. The balance chamber is used in the pressure regulator to offset the unbalanced force of the pressure regulator front end pressure on the valve pad, thereby increasing the pressure regulator's pressure stabilization accuracy level and the applicable inlet pressure range of the pressure regulator. The principle is that the inlet pressure of the pressure regulator passes through the valve seat and flows into the balance chamber through channels such as the valve pad and the valve stem. The pressure acts on the rolling diaphragm of the balance chamber, exerting a force on the rolling diaphragm bracket and the valve stem valve pad connected to the bracket. The equivalent area of the balancing diaphragm is calculated to match the area of the valve port so that the force exerted by the inlet pressure on the rolling diaphragm and the valve pad assembly connected thereto is the same as the force exerted by the inlet pressure on the valve pad, but in opposite directions, and the sum of the two is zero, achieving the best effect.
[0003] Problems with conventional rolling diaphragms:
[0004] 1. The movement trajectory of the rolling diaphragm is not fixed, and wrinkles are prone to occur during the movement. It is more likely to be damaged or leaked after long-term use, resulting in energy waste and manpower waste in maintenance services.
[0005] 2. The rolling diaphragm and the rolling diaphragm bracket do not fit well, resulting in instability in the equivalent area of the rolling diaphragm during the operation of the balancing chamber. The force of the balancing chamber and the force exerted on the valve pad by the inlet pressure fluctuate continuously, causing unstable pressure regulation accuracy of the pressure regulator.
[0006] 3. The structural design of the rolling diaphragm of a single plane seal needs to pay attention to controlling factors such as the amount of compression and the expansion space of the diaphragm. If the compression is excessive or the expansion space is insufficient during the assembly and production process, the diaphragm will be damaged, and the risk of leakage during operation is high.
[0007] Therefore, it is necessary to design a rolling diaphragm and a gas pressure regulator to solve the above problems. Utility Model Content
[0008] In view of the above-mentioned technical problems, the purpose of the utility model is to provide a rolling diaphragm and a gas pressure regulator. By setting the inner wall and the axial direction of the rolling diaphragm at a preset angle, the interference fit between the inner wall and the bracket plays a sealing role, which can effectively solve the problem that the rolling diaphragm path cannot be restricted, and effectively reduce the risk of wear and leakage of the rolling diaphragm under long-term operation; at the same time, the tight fit between the rolling diaphragm and the bracket can also solve the problem that under conventional cooperation, the equivalent area of the rolling diaphragm fluctuates with the change of the valve opening during operation, thereby effectively ensuring the stability of the pressure regulation accuracy during operation.
[0009] In order to achieve the above object, the utility model provides a rolling diaphragm, which is used for interference fit installation on the bracket of the gas pressure regulator, and comprises: an inner side wall, an arc wall and an outer side wall which are fixedly connected in sequence, wherein the inner side wall, the arc wall and the outer side wall are surrounded to form an annular groove, and the notch of the annular groove faces the side away from the arc wall;
[0010] The inner wall is arranged at a preset angle with respect to the axis direction of the rolling diaphragm, and a first bending portion is arranged at one end of the inner wall away from the arc-shaped wall, and the first bending portion extends in a direction away from the outer wall by a preset length;
[0011] A second bent portion is disposed at one end of the outer side wall away from the arc-shaped wall, and the second bent portion extends to a preset length in a direction away from the inner side wall.
[0012] In some embodiments, the angle formed between the inner wall and the axial direction of the rolling diaphragm is 5°-20°.
[0013] In some embodiments, the angle formed between the inner wall and the axial direction of the rolling diaphragm is 10°.
[0014] In some embodiments, the outer side wall is arranged parallel to the axial direction of the rolling diaphragm.
[0015] In some embodiments, the second bending portion is arranged around the outer side wall, and the second bending portion is arranged perpendicular to the outer side wall.
[0016] In some embodiments, the first bending portion is arranged around the inner side wall, and the angle formed between the second bending portion and the inner side wall is 95°-110°.
[0017] In some embodiments, the angle formed between the second bending portion and the inner side wall is 100°, and the first bending portion and the second bending portion are located in the same plane.
[0018] In some embodiments, the rolling diaphragm is a rubber diaphragm or a polytetrafluoroethylene diaphragm.
[0019] According to another aspect of the utility model, the utility model further provides a gas pressure regulator, comprising the rolling diaphragm described in any one of the above, and further comprising:
[0020] A bracket, the rolling diaphragm is adaptively mounted on the bracket, the inner side wall is arranged at a preset angle with the axial direction of the bracket, the bracket and the rolling diaphragm are interference fit, a first annular groove is arranged at the end of the bracket, and the first bent portion is adaptively arranged in the first annular groove;
[0021] The inner ring pressure plate is connected to the bracket through a first bolt, and the first bent portion is clamped between the inner ring pressure plate and the bracket to tightly press the first bent portion into the first annular groove.
[0022] In some embodiments, it further comprises:
[0023] The outer shell of the balancing cavity is provided with a second annular groove, and the second bending portion is adapted to be arranged in the second annular groove;
[0024] The outer ring pressure plate is connected to the outer shell of the balancing chamber through a second bolt, and the second bent portion is clamped between the outer ring pressure plate and the outer shell of the balancing chamber to tightly press the second bent portion into the second annular groove.
[0025] Compared with the prior art, the rolling diaphragm and gas pressure regulator provided by the utility model have the following beneficial effects:
[0026] In the utility model, the inner wall and the axial direction of the rolling diaphragm are set at a preset angle, and a sealing effect is achieved by the interference fit between the inner wall and the bracket, which can effectively solve the problem that the path of the rolling diaphragm cannot be restricted, and effectively reduce the risk of wear and leakage of the rolling diaphragm under long-term operation; at the same time, the tight fit between the rolling diaphragm and the bracket can also solve the problem that under conventional cooperation, the equivalent area of the rolling diaphragm fluctuates with the change of the valve opening during operation, and effectively ensures the stability of the pressure regulation accuracy during operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.
[0028] Figure 1 It is a cross-sectional view of a rolling diaphragm of a preferred embodiment of the utility model;
[0029] Figure 2 It is a partial structural schematic diagram of a gas pressure regulator according to a preferred embodiment of the utility model.
[0030] Description of Figure Numbers:
[0031] Rolling diaphragm 1, inner wall 11, first bending portion 111, arc wall 12, outer wall 13, second bending portion 131, annular groove 14, bracket 2, inner ring pressure plate 3, first bolt 31, balance chamber outer shell 4, outer ring pressure plate 5, second bolt 51, angle A formed by the inner wall and the axial direction of the rolling diaphragm. DETAILED DESCRIPTION
[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0033] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".
[0034] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0035] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0036] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0037] In one embodiment, the reference specification Figure 1The utility model provides a rolling diaphragm 1, which is used for interference fit installation on the bracket of the gas pressure regulator, and comprises: an inner wall 11, an arcuate wall 12 and an outer wall 13 which are fixedly connected in sequence, the inner wall 11, the arcuate wall 12 and the outer wall 13 are surrounded to form an annular groove 14, and the notch of the annular groove 14 faces the side away from the arcuate wall 12; the inner wall 11 is arranged at a preset angle with the axial direction of the rolling diaphragm 1, and a first bending portion 111 is arranged at one end of the inner wall 11 away from the arcuate wall 12, and the first bending portion 111 extends a preset length in a direction away from the outer wall 13; a second bending portion 131 is arranged at one end of the outer wall 13 away from the arcuate wall 12, and the second bending portion 131 extends a preset length in a direction away from the inner wall 11.
[0038] Specifically, the angle A formed between the inner wall 11 and the axis direction of the rolling diaphragm 1 is 5°-20°. Figure 1 As shown, in the cross-sectional view of the rolling diaphragm 1, the angle between the inner side walls 11 on the two opposite sides is 2A. A can be 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, etc. Preferably, the angle A between the inner side wall 11 and the axial direction of the rolling diaphragm 1 is 10°.
[0039] Further, the outer wall 13 is arranged parallel to the axial direction of the rolling diaphragm 1. The second bending portion 131 is arranged around the outer wall 13, and the second bending portion 131 is arranged perpendicular to the outer wall 13. The first bending portion 111 is arranged around the inner wall 11, and the angle between the second bending portion 131 and the inner wall 11 is 95°-110°. Preferably, the angle between the second bending portion 131 and the inner wall 11 is 100°, and the first bending portion 111 and the second bending portion 131 are located in the same plane.
[0040] Furthermore, the rolling diaphragm 1 is a rubber diaphragm or a polytetrafluoroethylene diaphragm. That is, the rolling diaphragm 1 can be made of rubber or polytetrafluoroethylene. The rubber material is economical and has good pressure resistance. The rolling diaphragm 1 is made of rubber material, which can reduce production costs. Specifically, nitrile rubber and chloroprene rubber can be selected. The polytetrafluoroethylene material has a small friction coefficient and is heat-resistant and cold-resistant. The rolling diaphragm 12 is made of polytetrafluoroethylene material, which can reduce the influence of friction on the deformation of the rolling diaphragm 1, thereby reducing the influence on the displacement of the valve stem.
[0041] In this embodiment, the inner wall 11 and the axial direction of the rolling diaphragm 1 are set at a preset angle of 10°, and the interference fit between the inner wall 11 and the bracket plays a sealing role. This circumferential seal can effectively solve the problem that the path of the rolling diaphragm 1 cannot be restricted, and effectively reduce the risk of wear and leakage of the rolling diaphragm 1 under long-term operation; at the same time, the tight fit between the rolling diaphragm 1 and the bracket can also solve the problem that under conventional cooperation, the equivalent area of the rolling diaphragm 1 fluctuates with the change of the valve opening during operation, effectively ensuring the stability of the pressure regulation accuracy during operation.
[0042] According to another aspect of the present invention, the reference specification Figure 2 The utility model further provides a gas pressure regulator, comprising the rolling diaphragm 1 described in any one of the above, and also comprising: a bracket 2 and an inner ring pressure plate 3, the rolling diaphragm 1 is adaptively arranged on the bracket 2, the inner side wall 11 is arranged at a preset angle with the axial direction of the bracket 2, the bracket 2 and the rolling diaphragm 1 are interference fit, the end of the bracket 2 is provided with a first annular groove, and the first bending portion 111 is adaptively arranged in the first annular groove; the inner ring pressure plate 3 is connected to the bracket 2 by a first bolt 31, and the first bending portion 111 is clamped between the inner ring pressure plate 3 and the bracket 2 to tightly press the first bending portion 111 into the first annular groove.
[0043] Furthermore, the gas pressure regulator also includes: a balancing chamber outer shell 4 and an outer ring pressure plate 5, a second annular groove is arranged in the balancing chamber outer shell 4, and the second bending portion 131 is adapted to be arranged in the second annular groove; the outer ring pressure plate 5 is connected to the balancing chamber outer shell 4 by a second bolt 51, and the second bending portion 131 is clamped between the outer ring pressure plate 5 and the balancing chamber outer shell 4 to tightly press the second bending portion 131 into the second annular groove.
[0044] In this embodiment, the angle between the inner wall 11 and the axial direction of the rolling diaphragm 1 is 10°. There is a certain amount of interference when the rolling diaphragm 1 and the bracket 2 are assembled. The bracket 2 stretches it open and presses it against the side wall of the bracket 2. At the same time, an inner ring pressure plate 3 is provided under the bracket 2 to limit the inner circular edge of the rolling diaphragm 1 from slipping out of the range of the bracket 2; when the bracket 2 stretches the rolling diaphragm 1, a first-level circumferential seal is formed, and when the inner ring pressure plate 3 presses the rolling diaphragm 1 and the bracket 2, a second-level planar seal is formed. The first-level circumferential seal can ensure that the rolling diaphragm 1 is tightly fitted with the bracket 2 and limit the movement trajectory of the rolling diaphragm 1 to move straight up and down with the change of the valve opening, so as to ensure that the pressure regulator operates stably with high precision, increase the service life of the diaphragm, and reduce the risk of wear and leakage of the rolling diaphragm during long-term operation. The second-level seal can protect the inner edge of the rolling diaphragm 1 and the bracket 2 to maintain a relative position during a larger stroke, and at the same time serve as a second sealing barrier under high pressure conditions to reduce the risk of leakage.
[0045] The outer ring pressure plate 5 presses the outer edge of the rolling diaphragm 1 into the second annular groove reserved in the outer shell 4 of the balancing chamber. The inner side wall 11 of the rolling diaphragm 1 is first tightly sleeved on the outer ring of the bracket 2 during assembly, and then the inner ring pressure plate 3 presses the first bent portion 111 of the inner side wall 11 onto the bracket 2. The bracket 2 is connected to the valve stem, valve pad, etc., and the pressure is adjusted up and down at the same time. The inlet gas pressure flows into the balancing chamber through the valve pad channel. At this time, the inlet pressure exerts an upward pressure on the rolling diaphragm 1, driving the bracket 2 and its connecting parts to move up and down to offset the unbalanced force of the inlet pressure on the valve pad assembly.
[0046] When the bracket 2 opens the rolling diaphragm 1, a first-level circumferential seal is formed, and when the inner ring pressure plate 3 presses the first bending portion 111 of the rolling diaphragm 1 and the bracket 2, a second-level plane seal is formed. The first-level circumferential seal can ensure that the rolling diaphragm 1 and the bracket 2 are tightly fitted and limit the movement trajectory of the rolling diaphragm 1 to move straight up and down with the change of the valve opening, so as to ensure that the pressure regulator operates stably with high precision, increase the service life of the diaphragm, and reduce the risk of wear and leakage of the rolling diaphragm in long-term operation.
[0047] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0048] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.
Claims
1. A rolling diaphragm, characterized in that: The bracket is used for interference fit installation on the gas pressure regulator, and comprises: an inner side wall, an arc wall and an outer side wall which are fixedly connected in sequence, wherein the inner side wall, the arc wall and the outer side wall are surrounded to form an annular groove, and the notch of the annular groove faces the side away from the arc wall; The inner wall is arranged at a preset angle with respect to the axis direction of the rolling diaphragm, and a first bending portion is arranged at one end of the inner wall away from the arc-shaped wall, and the first bending portion extends in a direction away from the outer wall by a preset length; A second bent portion is disposed at one end of the outer side wall away from the arc-shaped wall, and the second bent portion extends to a preset length in a direction away from the inner side wall.
2. The rolling diaphragm according to claim 1, characterized in that: The angle formed between the inner side wall and the axial direction of the rolling diaphragm is 5°-20°.
3. The rolling diaphragm according to claim 2, characterized in that: The angle formed between the inner wall and the axial direction of the rolling diaphragm is 10°.
4. The rolling diaphragm according to any one of claims 1 to 3, characterized in that: The outer side wall is arranged parallel to the axial direction of the rolling diaphragm.
5. The rolling diaphragm according to claim 4, characterized in that: The second bending portion is arranged around the outer side wall, and the second bending portion is arranged perpendicular to the outer side wall.
6. The rolling diaphragm according to claim 1, characterized in that: The first bending portion is arranged around the inner side wall, and the angle formed between the second bending portion and the inner side wall is 95°-110°.
7. The rolling diaphragm according to claim 6, characterized in that: The included angle between the second bending portion and the inner side wall is 100°, and the first bending portion and the second bending portion are located in the same plane.
8. The rolling diaphragm according to claim 1, characterized in that: The rolling diaphragm is a rubber diaphragm or a polytetrafluoroethylene diaphragm.
9. A gas pressure regulator, characterized in that: The rolling diaphragm according to any one of claims 1 to 8 further comprises: A bracket, the rolling diaphragm is adaptively mounted on the bracket, the inner side wall is arranged at a preset angle with the axial direction of the bracket, the bracket and the rolling diaphragm are interference fit, a first annular groove is arranged at the end of the bracket, and the first bent portion is adaptively arranged in the first annular groove; The inner ring pressure plate is connected to the bracket through a first bolt, and the first bent portion is clamped between the inner ring pressure plate and the bracket to tightly press the first bent portion into the first annular groove.
10. The gas pressure regulator according to claim 9, characterized in that: Also includes: The outer shell of the balancing cavity is provided with a second annular groove, and the second bending portion is adapted to be arranged in the second annular groove; The outer ring pressure plate is connected to the outer shell of the balancing chamber through a second bolt, and the second bent portion is clamped between the outer ring pressure plate and the outer shell of the balancing chamber to tightly press the second bent portion into the second annular groove.