Primary diaphragm type pressure reducer structure

Abstract

The invention relates to the technical field of pressure reducers, in particular to a primary diaphragm type pressure reducer structure which comprises a valve body and a valve cover, a diaphragm is buckled on the valve body through the valve cover and then blocked to form a diaphragm cavity, the diaphragm cavity is communicated with an air inlet channel and further connected with a valve element cavity through a valve hole, and a valve element assembly II is arranged in the valve element cavity. A valve element rod in the valve element assembly II penetrates through the valve hole and then abuts against the lower surface of the diaphragm, a plug capable of blocking the valve hole is arranged on the valve element rod, and an upper adjusting assembly I capable of adjusting the output pressure of the pressure reducer is arranged on the upper surface of the diaphragm. The valve element cavity is further connected with the air outlet channel. A center assembly III penetrating through the diaphragm is arranged in the center of the diaphragm, and the penetrating position is arranged in a sealed mode. The center assembly III is provided with an inner cavity, and a through hole is formed in the lower wall of the inner cavity. A cap head is arranged at the upper end of the valve element rod and placed in the inner cavity, a gap is formed between the circumferential inner walls of the cap head and the inner cavity, the valve element rod extends downwards from the through hole, and a gap is formed between the circumferential side walls of the valve element rod and the inner cavity. The pressure reducer has the beneficial effects that the force of the pressure reducer in the axial direction is more controllable, the output pressure of the pressure reducer is stable, the output curve is smooth and straight, and the output performance of the pressure reducer can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, in particular to a one-stage diaphragm type pressure reducing device structure. Background Art

[0002] Pressure reducing valves are components that control fluid pressure and are commonly used in fuel gas and hydrogen. In some first-stage diaphragm pressure reducers, they can reduce pressure fluctuations when used in fuel gas and hydrogen.

[0003] When the fluid pressure is passively reduced, the structure and principle adopted are (assuming that the fluid is gas): a cavity is designed, and the cavity is sealed into a membrane cavity by a diaphragm; a valve core cavity is opened below the membrane cavity, and the top of the valve core cavity is connected with the membrane cavity through a valve hole; the valve core cavity is connected with the air inlet channel, and an electromagnetic valve assembly is arranged at the air inlet channel; the membrane cavity is connected with the air outlet channel; a valve core assembly is arranged in the valve core cavity, and the valve core rod of the valve core assembly is against the bottom of the diaphragm after passing through the valve hole, and an upper spring is arranged above the diaphragm; a piston plug is provided on the valve core rod, and a gap is formed between the piston plug and the valve hole, and the size of the gap can be controlled by the action of the valve core rod, thereby realizing the regulation of the air pressure fluctuation in the membrane cavity. During operation: When the solenoid valve assembly is opened, the pressurized gas inlet channel enters the valve core cavity, and then the hydrogen enters the membrane cavity through the gap between the valve core rod (piston plug) and the valve hole, and then flows out from the membrane cavity to the gas outlet channel; when the air pressure in the membrane cavity fluctuates, it will cause the diaphragm to arch to different degrees, causing the valve core rod to move up and down, thereby implementing the pressure regulation in the membrane cavity.

[0004] However, the problem with the above-mentioned first-stage diaphragm pressure reducer is that the center of the diaphragm is generally clamped by an upper pressure ring and a lower pressure ring, the upper spring cooperates with the upper pressure ring, and the lower pressure ring cooperates with the valve core assembly. When the diaphragm cavity arches, the force generated to arch is not necessarily vertically upward - there may be a small angle deviation from the vertical direction. At this time, the diaphragm will have a certain displacement in the horizontal direction, and the valve core rod can only move up and down along the axis - that is, vertically (cannot move radially, that is, horizontally); this will cause friction between the diaphragm and the valve core rod, and since the left and right displacement of the diaphragm is difficult to determine, the friction is difficult to determine; in addition, the deformation of the diaphragm arching upward is not always vertically upward, which causes the downward pressure generated by the upper spring to have an angle deviation from the vertical direction. Since these forces are not easy to predict in the current pressure reducer, the subsequent output pressure curve is not accurate, which directly affects the output pressure characteristics of the pressure reducer (determines the output performance of the pressure reducer). Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a one-stage diaphragm type pressure reducer structure, which solves the problem that the output pressure of the pressure reducer is affected due to the increased friction between the valve core assembly and the clamping part of the diaphragm.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] In the first aspect, a first-stage diaphragm pressure reducer structure is disclosed, including a valve body and a valve cover. The valve cover buckles the diaphragm on the valve body and then blocks it to form a diaphragm cavity. The diaphragm cavity is also connected to the valve core cavity through the valve hole. A valve core component II is arranged in the valve core cavity. The valve core rod in the valve core component II passes through the valve hole and abuts against the lower surface of the diaphragm. The valve core rod has a plug that can block the valve hole. An upper adjustment component I that can adjust the elasticity is arranged on the upper surface of the diaphragm; the valve core cavity is connected to the air inlet channel, and the diaphragm cavity is connected to the air outlet channel;

[0008] The center of the diaphragm is provided with a central component III penetrating the diaphragm, and the penetration point is sealed;

[0009] The central component III has an inner cavity, and a through hole is opened at the lower wall of the inner cavity; the upper end of the valve core rod has a cap head, the cap head is installed in the inner cavity, and there is a distance between the circumferential inner walls of the two, and the valve core rod extends downward from the through hole, and there is a distance between the circumferential side walls of the two;

[0010] When the diaphragm is deformed to cause the central component III to move, if the central component III does not move up and down along the axial direction of the valve core rod, no friction is generated between the cap head and the side wall of the inner cavity, and no friction is generated between the valve core rod and the side wall of the through hole.

[0011] In some preferred embodiments, the central component III includes a first upper pressure ring and a first lower pressure ring;

[0012] The first lower pressure ring has an integrated central column, a through hole is opened at the center of the diaphragm, and the central column passes through the through hole; the first upper pressure ring is sleeved on the central column and is locked with the central column thread through a locking nut.

[0013] Alternatively, in some preferred embodiments, in the central component III, the central column is recessed downward from the upper end to form an inner cavity, a through hole is formed at the bottom of the inner cavity, an upper cover is screwed onto the upper end of the central column and a first sealing ring is provided between the two; in the valve core component II, the cap head at the upper end of the valve core rod is a columnar cap head; the columnar cap head is threaded onto the upper end of the valve core rod, and there is a spacing between the columnar cap head and the side wall of the inner cavity.

[0014] Furthermore, in the central component III, the central column is recessed upward from the lower end surface to form a cylindrical installation cavity, an inner column is installed in the cylindrical installation cavity and a second sealing ring is provided between the two; the inner column has an inner cavity, which is a spherical inner cavity and a through hole is provided at the bottom; in the valve core component II, the cap head at the upper end of the valve core rod is a spherical cap head, the spherical cap head is located in the spherical inner cavity and there is a gap between the two in the circumferential direction.

[0015] In the second aspect, a first-stage diaphragm pressure reducer structure is also disclosed, including a valve body and a valve cover. The valve cover buckles the diaphragm on the valve body and then blocks it to form a diaphragm cavity. The diaphragm cavity is also connected to the valve core cavity through the valve hole. A valve core component II is arranged in the valve core cavity. The valve core rod in the valve core component II passes through the valve hole and abuts against the lower surface of the diaphragm. The valve core rod has a plug that can block the valve hole. An upper adjustment component I that can adjust the elasticity is arranged on the upper surface of the diaphragm; the valve core cavity is connected to the air inlet channel, and the diaphragm cavity is connected to the air outlet channel; a central component III that penetrates the diaphragm is arranged at the center of the diaphragm, and a sealing arrangement is arranged at the penetration point; a cylindrical protrusion is arranged at the center of the upper surface of the central component III;

[0016] The upper adjustment component I comprises an upper spring, a pressure-bearing member and a pressure-adjusting screw, and the three are coaxial;

[0017] The lower end of the pressure regulating screw is a hemispherical head;

[0018] The lower end of the upper spring is sleeved on the cylindrical protrusion, and a pressure-bearing piece is placed on the upper end. The pressure-adjusting screw is threadedly installed on the valve cover and the hemispherical head is against the upper surface of the pressure-bearing piece.

[0019] In some preferred embodiments, the pressure-bearing member is an inner cover that is concave downward, and the inner cover has an outward flange. The upper spring is sleeved on the outer cylindrical surface of the inner cover and abuts against the flange.

[0020] In the third aspect, a first-stage diaphragm pressure reducer structure is also disclosed, including a valve body and a valve cover. The valve cover buckles the diaphragm on the valve body and then blocks it to form a diaphragm cavity. The diaphragm cavity is also connected to the valve core cavity through the valve hole. A valve core component II is arranged in the valve core cavity. The valve core rod in the valve core component II passes through the valve hole and abuts against the lower surface of the diaphragm. The valve core rod has a plug that can block the valve hole. An upper adjustment component I that can adjust the elasticity is arranged on the upper surface of the diaphragm; the valve core cavity is connected to the air inlet channel, and the diaphragm cavity is connected to the air outlet channel; a central component III that penetrates it is arranged at the center of the diaphragm, and a sealing arrangement is arranged at the penetration;

[0021] A coaxial guide is installed on the upper surface of the diaphragm;

[0022] The lower part of the guide is a ring disk fixed on the diaphragm; the ring disk is provided with a plurality of evenly distributed supporting feet in the circumferential direction, and the back of the supporting feet contacts the inner side wall of the valve cover.

[0023] In a fourth aspect, the first, second and third aspects of the first stage diaphragm pressure reducer structures are used together. Of course, they can also be implemented separately or in combination of two.

[0024] The present invention has the following advantages:

[0025] The diaphragm is guided to move in the reverse direction up and down as much as possible, the upper adjustment component I generates a vertical downward force on the diaphragm along the axis, and the friction between the valve core component II and the center component III on the diaphragm is reduced, so that the output pressure of the pressure reducer is stable and the output curve is smooth and straight, so that the pressure reducer has excellent output performance;

[0026] Method 1: Setting a guide: When the diaphragm is deformed (upwardly arched or downwardly sunken), the deformation force that can be generated is not vertically upward. The guide is used to guide the deformation force of the diaphragm so that it is vertically upward and along the axis to a certain extent.

[0027] Means 2: The pressure-adjusting screw is pressed against the center of the pressure-bearing part through the lower hemispherical head, and the pressure-bearing part is a downwardly concave inner cover structure, and the upper spring is sleeved on the pressure-bearing part; in this way, the pressure-adjusting screw can generate vertical downward pressure at the axis;

[0028] Means three: There is a radial distance between the cap head at the upper end of the valve core assembly and the inner cavity of the center assembly, so that when the diaphragm is irregularly deformed, resulting in radial displacement of the diaphragm, friction between the cap head and the inner cavity can be avoided (therefore, the friction here is determined according to the deformation of the diaphragm, and the uncertainty of the diaphragm deformation leads to uncertainty in the size of the friction, resulting in uncontrollable friction);

[0029] Therefore, through the above-mentioned means one, means two, and means three, the force of the pressure reducer in the axial direction is more controllable (the output pressure stability of the pressure reducer is affected by the force, and the more controllable force, the better the performance of the tester produced), so that the output pressure of the pressure reducer is stable and the output curve is smooth and straight, which can effectively improve the output performance of the pressure reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the present invention;

[0032] Figure 3 It is a schematic diagram of the internal structure of the cap head and the center component III, the first design;

[0033] Figure 4 It is a schematic diagram of the structure between the cap head and the center component III, the first design, the valve core component II and the center component III;

[0034] Figure 5 It is a schematic diagram of the structure between the cap head and the center component III of the first design, and the cap head of the valve core rod and the center component III;

[0035] Figure 6 It is a schematic diagram of the internal structure of the cap head and the center component III, the second design;

[0036] Figure 7 It is a schematic diagram of the structure between the cap head and the center component III, the second design, the valve core component II and the center component III;

[0037] Figure 8 It is a schematic diagram of the structure between the cap head and the center component III of the second design, and the cap head of the valve core rod and the center component III;

[0038] Fig. 9 It is a schematic diagram of the structure in which the guide member is arranged between the diaphragm and the valve cover;

[0039] Fig.10 It is a schematic diagram of the structure between the guide member and the diaphragm;

[0040] In the figure: 10, valve body; 20, valve cover; 30, diaphragm; 60, air outlet channel; 70, air inlet channel; 90, solenoid valve assembly; 100, safety valve assembly;

[0041] 41. Upper spring; 42. Pressure-bearing member; 43. Pressure-adjusting screw; 4301. Hemispherical head;

[0042] 51, valve core rod; 5101, plug; 5102, cap; 5103, plug post; 5104, left-handed spring; 5105, right-handed spring; 5106, annular support; 5107, third sealing ring;

[0043] 510201, adjusting cap nail A; 510202, overset;

[0044] 80, inner cavity; 81, first upper pressure ring; 82, second lower pressure ring; 8201, center column; 8202, locking nut;

[0045] 83. upper cover; 84. first sealing ring;

[0046] 85. Inner column; 86. Second sealing ring; 87. Semi-cylinder; 88. Adjusting screw B;

[0047] 90-solenoid valve assembly;

[0048] 100-Safety valve assembly. DETAILED DESCRIPTION

[0049] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0050] It should be noted that the directions or positional relationships indicated by "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use, or are the directions or positional relationships commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0052] See also Figure 1 As shown, the first-stage diaphragm pressure reducer in this specific embodiment has the following structure:

[0053] The valve body 10 comprises a valve cover 20. The upper surface of the valve body 10 has a concave cavity. The valve cover 20 is buckled on the upper surface of the valve body 10. A diaphragm 30 is placed at the buckling position. Thus, the diaphragm 30 seals the concave cavity into a diaphragm cavity.

[0054] A cylindrical valve core cavity is opened at the bottom center of the valve body 10, a valve hole is opened at the top of the valve core cavity, and the valve core cavity is connected with the membrane cavity through the valve hole;

[0055] See also Figure 1 and Figure 3 , an air inlet channel 70 is also provided on the valve body 10; specifically, the air inlet channel 70 includes an oblique channel, a side cavity, and a radial channel; a recessed cavity is provided on the side wall of the valve body 10, and the recessed cavity is blocked by installing the solenoid valve assembly 90 to form a side cavity, an oblique channel communicating with the side cavity is provided upward from the bottom surface of the valve body 10, and a radial channel communicating with the side cavity is provided in the horizontal direction, and the plug of the solenoid valve assembly 90 is against the outlet of the radial channel at the side cavity wall; when the plug is opened, the gas can enter the valve core cavity through the oblique channel, the side cavity, and the radial channel;

[0056] In addition, the membrane cavity is also connected to the air outlet channel 60 on the valve body;

[0057] In addition, a safety passage connected to the membrane cavity is opened on the valve body 10, and a safety valve assembly 100 is arranged at the safety passage (when the air pressure in the membrane cavity exceeds the setting, the safety valve assembly 100 automatically opens, generally with an elastic plug structure, and opens when the air pressure exceeds the elastic force);

[0058] In addition, an elastic upper adjustment component I is arranged in the valve cover 20, and the output pressure of the pressure reducer can be adjusted by the upper adjustment component I, and a valve core component II is placed in the valve core cavity; the valve core component II has a valve core rod 51, and a plug 5101 is provided at the middle of the valve core rod. The valve core rod 51 is placed in the valve core cavity, and its upper end passes through the valve hole and abuts against the lower surface of the diaphragm 30, and when the valve core rod 51 moves up and down, the valve hole can be blocked by the plug 5101; the upper end of the valve core component II abuts against the inner top wall of the valve cover 20, and the lower end abuts against the upper surface of the diaphragm 30;

[0059] During operation: (1) When the solenoid valve assembly is closed, no gas enters. At this time, the downward elastic force generated by the upper regulating assembly I is greater than the upward elastic force of the valve core assembly II, and the gap between the valve core rod 51 and the valve hole is the largest; (2) If the pressure reducer is required to deliver hydrogen, the solenoid valve assembly 90 is opened, and the hydrogen enters the valve core cavity through the air inlet channel. The hydrogen in the valve core cavity enters the membrane cavity through the gap between the valve core rod 51 and the valve hole, and then is delivered from the membrane cavity to the corresponding valve through the air outlet channel 60. In addition, during the normal hydrogen delivery process, there is air pressure in the membrane cavity, and the diaphragm 30 is arched upward. At this time, the downward force of the upper regulating component I, the upward force of the valve core component II, and the upward arching force of the diaphragm 30 are in a balanced state; (3) In (2), if there is too much hydrogen in the membrane cavity, resulting in a large air pressure in the membrane cavity, the air pressure will cause the diaphragm 30 to arch upward to a greater extent, which will reduce the air pressure in the membrane cavity due to the large volume of the membrane cavity, thereby realizing the air pressure fluctuation. In addition, when the diaphragm 30 is arched upward to a greater extent, a greater upward force will be generated, which will cause the upper adjustment component I and the valve core component II to move upward, which will reduce the gap between the valve core rod 51 and the valve hole, making the amount of hydrogen entering the diaphragm cavity from the valve core cavity smaller, and also reducing the air pressure in the diaphragm cavity; (4) In (2), if the amount of hydrogen in the diaphragm cavity is small, the diaphragm 30 will change from a normal arched state to a state with a smaller arch, so that the volume of the diaphragm cavity becomes smaller. , the air pressure in the membrane cavity is increased by reducing the volume; in addition, when the diaphragm 30 changes from a normal arched state to a less arched state, the upper adjustment component I and the valve core component II will move downward, which will increase the gap between the valve core rod 51 and the valve hole, thereby increasing the amount of hydrogen entering the membrane cavity from the valve core cavity, and also increasing the air pressure in the membrane cavity; (5) In (2), if the air pressure in the membrane cavity is very large and exceeds the set air pressure, the gas is discharged through the safety valve component 100.

[0060] However, the above-mentioned one-stage diaphragm pressure reducer has the following problems: generally, a center component III is arranged at the center of the diaphragm 30, a through hole is opened at the center of the diaphragm 30, and the center component III is sealed and installed at the through hole; the upper adjustment component I is sleeved on the upper end of the center component III, and the valve core component II extends into the lower end of the center component III. Problem 1: When the diaphragm 30 is deformed, the force generated by the deformation of the diaphragm 30 is not necessarily in the axial direction of the upper adjustment component I or the axial direction of the valve core component II. For example, when the diaphragm 30 arches upward, the force generated by the arch may have a certain angle with the vertical direction, and the output pressure of the pressure reducer is determined by the downward force generated by the upper adjustment component I, the upward force generated by the valve core component II, and the force generated by the deformation of the diaphragm 30. When the direction of the force generated by the deformation of the diaphragm 30 is uncontrollable, the component force in the vertical direction will be uncontrollable, which makes it difficult to accurately control the air pressure output by the pressure reducer, which directly determines the quality of the output performance of the pressure reducer. Problem 2: In addition, there is also the problem that the downward force generated by the upper adjustment component I may not be vertically downward, because it is generally through the downward pressure of the upper spring, and the lower end of the upper spring is against the upper surface of the diaphragm 30. When the deformation of the diaphragm 30 is uncontrollable (not vertically upward deformation), it is likely to cause the axis of the upper spring to deviate from the vertical direction, resulting in the downward force generated by the upper adjustment component I may not be vertically downward. Problem 3: In addition, when the diaphragm 30 is deformed, since it is not deformed in the vertical direction, it may cause the diaphragm 30 to move radially, thereby causing friction between the upper end of the valve core component II and the center component III. The generation of this friction force further leads to the complexity of the vertical force, making it more difficult to accurately control the air pressure output by the pressure reducer.

[0061] For the above-mentioned problem 1, this specific embodiment discloses a one-stage diaphragm pressure reducer structure.

[0062] See also Fig. 9 and Fig.10 As shown, a guide 110 is provided on the upper part of the diaphragm 30; the lower part of the guide 110 is a ring disk, which is fixed on the diaphragm 30; there are multiple evenly distributed support feet on the circumference of the ring disk, the back of the support feet is in contact with the inner wall of the valve cover 20, and a certain angle deformation can be generated between the right angle and the ring disk.

[0063] During operation, if the diaphragm 30 undergoes a certain deformation, under the friction between the spherical protrusion and the inner wall of the valve cover 20, it is possible to avoid a large deformation at a certain location of the diaphragm 30 and a small deformation at other locations, and can effectively guide the diaphragm 30 to deform in the vertical direction. Of course, the friction between the spherical protrusion and the valve cover 20 increases the complexity of the force on the diaphragm in the vertical direction; however, the friction can be found to have a certain curve through a limited number of experiments. Compared with the deformation of the diaphragm 30 in any direction, this method is more controllable for the force situation.

[0064] For the second problem mentioned above, this specific embodiment discloses a one-stage diaphragm pressure reducer structure.

[0065] See also Figure 3 The upper adjustment component I includes an upper spring 41, a pressure piece 42 and a pressure adjusting screw 43, and the three are coaxial; wherein the lower end of the pressure adjusting screw 43 is a hemispherical head 4301. There is a cylindrical protrusion at the center of the upper surface of the central component III. During installation, the lower end of the upper spring 41 is sleeved on the cylindrical protrusion, and the pressure piece 42 is placed on the upper end. The pressure adjusting screw 43 is threadedly installed on the valve cover 20, and the hemispherical head 4301 is against the upper surface of the pressure piece 42.

[0066] In this way, the hemispherical head 4301 is pressed against the center of the pressure-bearing part 42 to achieve point-to-surface contact, which can allow the pressure-adjusting screw 43 to generate a vertical downward force, which can be along the axis of the upper spring 41 to a certain extent (of course, since the diaphragm 30 does not necessarily deform in the up and down directions, the axis of the upper spring 41 may deviate from the vertical direction, but the structural design of the present scheme avoids the pressure-adjusting screw 43 not generating a vertical downward force).

[0067] Preferably, the pressure-bearing member 42 is an inner cover that is concave downward and has an outwardly turned edge. The upper spring 41 is sleeved on the outer cylindrical surface of the inner cover and abuts against the turned edge.

[0068] For the third problem mentioned above, this specific embodiment also discloses a one-stage diaphragm pressure reducer structure.

[0069] See also Figure 2-Figure 8 The center component III has an inner cavity 80, and a through hole is opened at the lower wall of the inner cavity 80; the upper end of the valve core rod 51 has a cap head 5102, the cap head 5102 is installed in the inner cavity 80, and there is a distance between the circumferential inner walls of the two, and the valve core rod 51 extends downward from the through hole, and there is a distance between the circumferential side walls of the two;

[0070] When the diaphragm 30 is deformed to cause the central component III to move, if the central component III does not move up and down along the axial direction of the valve core rod 51, no friction is generated between the cap head 5102 and the side wall of the inner cavity 80, and no friction is generated between the valve core rod 51 and the side wall of the through hole.

[0071] There are various designs for the cap head 5102 at the upper end of the valve core rod 51 and the inner cavity 80 of the central component III, which are further exemplified below.

[0072] It should be noted that, see Figure 4 , Figure 5 , Figure 7 , Figure 8 , center component III, includes a first lower pressure ring 82 with an integrated center column 8201, a through hole is opened at the center of the diaphragm 30, and the center column 8201 passes through the through hole; the first upper pressure ring 82 is sleeved on the center column 8201, and is threadedly locked with the center column 8201 through a locking nut 8202; the lower surface of the first upper pressure ring 81 and the upper surface of the first lower pressure ring 82 are in contact with the lower and upper surfaces of the diaphragm 30.

[0073] Exemplarily, the cap head 5102 and the first design of the inner cavity 80.

[0074] See also Figure 3-Figure 5 In the center component III, the center column 8201 is sunken downward from the upper end to form an inner cavity 80, a through hole is formed at the bottom of the inner cavity 80, an upper cover 83 is screwed on the upper end of the center column 8201, and a first sealing ring 84 is provided between the two. In the valve core component II, the cap 5102 at the upper end of the valve core rod 51 is a columnar cap; the columnar cap is screwed on the upper end of the valve core rod 51, and there is a gap between the columnar cap and the side wall of the inner cavity 80.

[0075] Further, see Figure 5 The columnar cap head includes an adjusting screw 510201 and a transition sleeve 510202. The adjusting screw 510201 is threaded on the upper end of the valve core rod 51. A threaded sleeve 510202 is provided on the upper ends of the adjusting screw 5010201 and the valve core rod 51 to form a columnar cap head structure.

[0076] Exemplarily, the cap head 5102 and the first design of the inner cavity 80.

[0077] See also Figure 6-Figure 8 In the center component III, the center column 8202 is recessed upward from the lower end surface to form a cylindrical installation cavity, and the inner column 85 is installed in the cylindrical installation cavity, and a second sealing ring 86 is provided between the two. In addition, the inner column 85 has an inner cavity 80, which is a spherical inner cavity with a through hole at the bottom; in the valve core component II, the cap 5102 at the upper end of the valve core rod 51 is a spherical cap, which is located in the spherical inner cavity and there is a gap between the two in the circumferential direction.

[0078] Further, see Figure 7 and Figure 8A central cavity A is opened upward at the bottom of the central column 8202, and a stepped hole is opened upward at the top of the central cavity A; an inner column 85 is formed inside the central cavity A, and a second sealing ring 86 is provided between the two; a central cavity B is opened upward at the bottom of the inner column 85, and two semi-cylinders 87 are buckled together to form a cylinder, which is threaded with the central cavity B; a recess is opened in the semi-cylinder 87, and when the two semi-cylinders 87 are combined, an inner cavity 80 and a corresponding through hole are formed. When installing, the two semi-cylinders 87 are buckled on the upper end of the valve core rod 51, so that the cap head 5102 on the upper end of the valve core rod 51 is located in the inner cavity 80 and the valve core rod 51 is located in the through hole; then the cylindrical thread formed by the buckling of the two semi-cylinders 87 is screwed into the central cavity B, and then the inner column 85 is inserted into the central cavity A; then the adjusting screw B88 is inserted into the stepped hole at the top of the central cavity A, and a corresponding threaded hole is also opened at the top of the inner column 85, and finally the adjusting screw B88 is threadedly matched with the threaded hole, so as to tighten the inner column 85 upward;

[0079] During assembly: a vertically upward valve core cavity is opened at the bottom of the valve body 10, and a valve hole is opened at the top of the valve core cavity; a raised plug 5101 is provided at the middle of the valve core rod 51, and the plug 5101 is covered with a valve core rubber; during installation, the valve core rod 51 is extended into the valve core cavity from the bottom, and then the upper end of the valve core rod 51 is passed upward through the valve hole, and the upper end of the valve core rod 51 continues to extend into the inner cavity 80 of the central component III, and then the cap head 5102 is threaded on the upper end of the valve core rod 51; it should be noted that when the valve core rod 51 moves up and down, the valve hole can be closed / opened by the valve core rubber on the plug 5101.

[0080] The installation of the lower portion of the valve core rod 51 is further described below.

[0081] See also Figure 4 or Figure 7 , a plugging column 5103 is screwed into the lower cavity of the valve core cavity through a thread, and a center hole is opened on the plugging column 5103, and the center hole is coaxial with the valve hole; during installation, a left-handed spring 5104 and a right-handed spring 5105 are sleeved on the lower part of the valve core rod 51, and then the annular support 5106 is sleeved, and then the plugging column 5103 is sleeved, and the plug 5103 is screwed on the lower cavity of the valve core cavity; it should be noted that the diameters of these two springs are different, and the upper ends both abut against the plug 5101, and the lower ends both abut against the annular support 5106; it should also be noted that the lower end of the valve core rod 51 extends into the center hole of the plugging column 5103 and a third sealing ring 5107 is provided between the two;

[0082] In addition, an air outlet branch is opened in the valve core cavity in the radial direction.

[0083] It should be noted that the core goal of this solution is to achieve the stability of the output pressure of the pressure reducer. The means designed in the above-mentioned problems 1, 2 and 3 can be implemented separately, but the effect is best when they are implemented together.

[0084] After testing, it was found that when the means designed in the above-mentioned Questions 1, 2 and 3 were implemented together, the output pressure of the pressure reducer was stable, the output curve was smooth and straight, and the pressure fluctuation ratio could be controlled within 1.5% when the pressure reducer was working with variable output flow or working with a stable output flow as the inlet pressure dropped from 35MPa to 2MPa.

[0085] The above embodiments only express preferred implementation modes, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A first-stage diaphragm pressure reducer structure, comprising a valve body (10) and a valve cover (20), wherein the valve cover (20) buckles the diaphragm (30) on the valve body (10) so that the diaphragm (30) and the valve body (10) are blocked to form a diaphragm cavity, the diaphragm cavity is also connected to the valve core cavity through the valve hole, a valve core assembly II is arranged in the valve core cavity, a valve core rod (51) in the valve core assembly II passes through the valve hole and abuts against the lower surface of the diaphragm (30), the valve core rod (51) is provided with a plug (5101) capable of blocking the valve hole, and an upper adjustment assembly I capable of adjusting the elasticity is arranged on the upper surface of the diaphragm (30); the valve core cavity is connected to the air inlet channel (70), and the diaphragm cavity is connected to the air outlet channel (60); the characteristics are: The center of the diaphragm (30) is provided with a central component III penetrating the diaphragm, and the penetration point is sealed; The central component III has an inner cavity (80), and a through hole is opened at the lower wall of the inner cavity (80); the upper end of the valve core rod (51) has a cap head (5102), the cap head (5102) is installed in the inner cavity (80) and there is a distance between the circumferential inner walls of the two, and the valve core rod (51) extends downward from the through hole, and there is a distance between the circumferential side walls of the two; When the diaphragm (30) is deformed to cause the central component III to move, if the central component III does not move up and down along the axial direction of the valve core rod (51), no friction is generated between the cap head (5102) and the side wall of the inner cavity (80), and no friction is generated between the valve core rod (51) and the side wall of the through hole.

2. The first-stage diaphragm pressure reducer structure according to claim 1 is characterized in that: The central component III comprises a first upper pressure ring (81) and a first lower pressure ring (82); The first lower pressure ring (82) has an integrated central column (8201), and a through hole is opened at the center of the diaphragm (30), and the central column (8201) passes through the through hole; the first upper pressure ring (82) is sleeved on the central column (8201) and is threadedly locked with the central column (8201) via a locking nut (8202).

3. The one-stage diaphragm pressure reducer structure according to claim 2 is characterized in that: In the central component III, the central column (8201) is recessed downward from the upper end to form an inner cavity (80), a through hole is formed at the bottom of the inner cavity (80), an upper cover (83) is screwed onto the upper end of the central column (8201), and a first sealing ring (84) is provided between the two; In the valve core assembly II, the cap head (5102) at the upper end of the valve core rod (51) is a columnar cap head; the columnar cap head is threaded onto the upper end of the valve core rod (51), and there is a distance between the columnar cap head and the side wall of the inner cavity (80).

4. The first-stage diaphragm pressure reducer structure according to claim 2 is characterized in that: In the central component III, the central column (8202) is recessed upward from the lower end surface to form a cylindrical installation cavity, an inner column (85) is installed in the cylindrical installation cavity, and a second sealing ring (86) is provided between the inner column (85) and the second sealing ring (86). The inner column (85) has an inner cavity (80), which is a spherical inner cavity with a through hole at the bottom; In the valve core assembly II, the cap head (5102) at the upper end of the valve core rod (51) is a spherical cap head, the spherical cap head is located in the spherical inner cavity and there is a gap between the two in the circumferential direction.

5. A first-stage diaphragm pressure reducer structure, comprising a valve body (10) and a valve cover (20), wherein the valve cover (20) buckles the diaphragm (30) on the valve body (10) to form a diaphragm cavity, and the diaphragm cavity is also connected to the valve core cavity through the valve hole, and a valve core component II is arranged in the valve core cavity, and the valve core rod (51) in the valve core component II passes through the valve hole and abuts against the lower surface of the diaphragm (30), and the valve core rod (51) is provided with a plug (5101) capable of blocking the valve hole, and an upper adjustment component I capable of adjusting the elasticity is arranged on the upper surface of the diaphragm (30); the valve core cavity is connected to the air inlet channel (70), and the diaphragm cavity is connected to the air outlet channel (60); a central component III is arranged at the center of the diaphragm (30) to penetrate it, and a sealing arrangement is arranged at the penetration point, characterized in that: The center of the upper surface of the central component III has a cylindrical protrusion; The upper adjustment component I comprises an upper spring (41), a pressure-bearing member (42) and a pressure-adjusting screw (43), and the three are coaxial; The lower end of the pressure regulating screw (43) is a hemispherical head (4301); The lower end of the upper spring (41) is sleeved on the cylindrical protrusion, and the upper end is provided with a pressure-bearing piece (42). The pressure-adjusting screw (43) is threadedly mounted on the valve cover (20) and the hemispherical head (4301) is against the upper surface of the pressure-bearing piece (42).

6. The one-stage diaphragm pressure reducer structure according to claim 5, characterized in that: The pressure-bearing member (42) is an inner cover that is concave downward and has an outwardly turned edge. The upper spring (41) is sleeved on the outer cylindrical surface of the inner cover and abuts against the turned edge.

7. A first-stage diaphragm pressure reducer structure, comprising a valve body (10) and a valve cover (20), wherein the valve cover (20) buckles the diaphragm (30) on the valve body (10) to form a diaphragm cavity, and the diaphragm cavity is also connected to the valve core cavity through the valve hole, and a valve core component II is arranged in the valve core cavity, and the valve core rod (51) in the valve core component II passes through the valve hole and abuts against the lower surface of the diaphragm (30), and the valve core rod (51) is provided with a plug (5101) capable of blocking the valve hole, and an upper adjustment component I capable of adjusting the elasticity is arranged on the upper surface of the diaphragm (30); a central component III penetrating the diaphragm (30) is arranged at the center of the diaphragm (30), and the penetration is sealed; the valve core cavity is connected to the air inlet channel (70), and the diaphragm cavity is connected to the air outlet channel (60); characterized in that: A coaxial guide member (110) is installed on the upper surface of the diaphragm (30); The lower part of the guide (110) is a ring disk fixed on the diaphragm (30); the ring disk has a plurality of evenly distributed support feet in the circumferential direction, and the backs of the support feet are in contact with the inner wall of the valve cover (20).

8. The structure of the first-stage diaphragm pressure reducer is characterized by: Adopt any two or three of the one-stage diaphragm pressure reducer structure according to any one of claims 1 to 4, the one-stage diaphragm pressure reducer structure according to any one of claims 5 or 6, and the one-stage diaphragm pressure reducer structure according to claim 7.

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