CN117469447A - Pressure limiting valve and output stability control method thereof - Google Patents
Pressure limiting valve and output stability control method thereof Download PDFInfo
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- CN117469447A CN117469447A CN202311824483.2A CN202311824483A CN117469447A CN 117469447 A CN117469447 A CN 117469447A CN 202311824483 A CN202311824483 A CN 202311824483A CN 117469447 A CN117469447 A CN 117469447A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 28
- 238000003825 pressing Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- CBVWMGCJNPPAAR-HJWRWDBZSA-N (nz)-n-(5-methylheptan-3-ylidene)hydroxylamine Chemical compound CCC(C)C\C(CC)=N/O CBVWMGCJNPPAAR-HJWRWDBZSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention relates to the technical field of pressure limiting valve manufacturing, in particular to a pressure limiting valve and a pressure limiting valve output stability control method. The valve comprises a valve body, wherein a valve plug cavity is formed in the bottom of the valve body, a valve plug is slidably arranged in the valve plug cavity, the valve plug is in sealing fit with the side wall of the valve plug cavity, a plug rod is arranged at one end of the valve plug, the plug rod extends into the bottom of the valve body, and a spring is arranged at one end, far away from the plug rod, of the valve plug; the bottom of the valve body is provided with a flow passage hole in a penetrating way, the plug rod is arranged in the flow passage hole, and the upper end of the plug rod is provided with a plug cover; the effective sealing area S1 of the plug cover and the effective sealing area S2 of the valve plug meet the formula: eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1. The method has the characteristic of controllable fluctuation range of the output end, and can ensure that the deviation ratio corresponding to the fluctuation range is not smaller than a preset value.
Description
Technical Field
The invention relates to the technical field of pressure limiting valve manufacturing, in particular to a pressure limiting valve and a pressure limiting valve output stability control method.
Background
The pressure limiting valve is a component for limiting the pressure in a pipeline and equipment, and is widely applied to a vehicle control system, and the pressure limiting valve has the functions of buffering, reducing pressure, limiting pressure and the like in an air suspension. In an air suspension system, the flow rate and pressure of the air flow have a critical effect on the stability of the overall air suspension. Although the output value of the pressure limiting valve is a fixed value in an ideal state, in actual working, the output pressure of the pressure limiting valve can fluctuate, if the fluctuation is too large, the output end executor can be unstable to operate, and the requirement on the output precision of the pressure limiting valve is improved. It is necessary to design a pressure limiting valve with controllable output stability.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the pressure limiting valve which has the advantage of controllable fluctuation range of an output end.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the pressure limiting valve comprises a valve body, wherein a valve plug cavity is formed in the bottom of the valve body, a valve plug is slidably arranged in the valve plug cavity, the valve plug is in sealing fit with the side wall of the valve plug cavity, a plug rod is arranged at one end of the valve plug, the plug rod extends into the bottom of the valve body, and a spring is arranged at one end, far away from the plug rod, of the valve plug; the bottom of the valve body is provided with a flow passage hole in a penetrating way, the plug rod is arranged in the flow passage hole, the upper end of the plug rod is provided with a plug cover, and the plug cover is arranged on one side of the flow passage hole away from the valve plug; the valve body is provided with a runner inlet and a runner outlet, the runner inlet is communicated with one end of a runner Kong Jin plug cover, and the runner outlet extends to be communicated with the side wall of the runner hole;
when in a natural state, the spring presses the valve plug upwards to the plug rod to push the plug cover, so that a gap is reserved between the plug cover and the runner hole, and the runner between the runner inlet and the runner outlet is communicated; after the valve plug moves a preset distance towards one side far away from the plug cover, the plug cover can be pressed at the end part of the runner hole, and the runner between the runner inlet and the runner outlet is disconnected. The effective sealing area S1 of the plug cover and the effective sealing area S2 of the valve plug meet the formula: eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1;
wherein, P1 is a preset maximum input pressure, P2 is a preset maximum output pressure, η is a preset minimum deviation ratio of the allowable output pressure, where η= (p2—Δp)/P2, Δp is a preset maximum fluctuation value of the allowable output pressure. S1, pressing the plug cover on the area corresponding to a sealing area formed at the upper end of the runner hole; s2, the cross section area of the valve plug cavity; according to the characteristics, the pressure limiting valve disclosed by the application has the advantages that the fluctuation range of the pressure output by the fluid from the outlet end of the flow passage is [ P2', P2], and P2'/P2 is larger than or equal to eta, namely P2 '. Gtoreq.P 2-delta.P. Therefore, output fluctuation can be controlled, and the method has the advantage of good reliability. The pressure limiting valve needs to preset the maximum input pressure and the maximum output pressure according to working conditions. Although in an ideal situation the output pressure is constant. However, in actual working, the output pressure will fluctuate, if the fluctuation is too large, the output end executor will not operate stably, so, under the working condition that the stability requirement of the output execution end is higher, for example, when the output end executor is applied to an air suspension, the minimum preset deviation ratio eta of the allowable output pressure will be preset to control the fluctuation range of the output pressure. According to the pressure limiting valve, the structural size is determined according to the preset maximum input pressure and output pressure and the minimum preset deviation proportion eta of the allowable output pressure, the characteristic that the fluctuation range of the output end is controllable is achieved, and the deviation proportion P2'/P2 corresponding to the fluctuation range can be ensured to be not smaller than eta.
Based on the structure, the pressure limiting valve is characterized in that: taking ventilation as an example, one end of the runner inlet is used for air intake, one end of the runner outlet is used for air exhaust, and the air sequentially passes through the runner inlet, the runner hole and the runner outlet, so that the air pressure in the inner cavity of the valve body is balanced in the process. Because the valve plug is sealed with the valve plug cavity side wall, consequently, the valve plug receives decurrent atmospheric pressure F2, after F2 surpasses the default, the valve plug then can overcome the elasticity decline preset distance of spring, so the clearance lid cuts off the runner between runner import and the runner export, and the atmospheric pressure then is the upper limit of runner export output atmospheric pressure this moment. Therefore, the effect of pressure limiting is realized, namely, when the input air pressure is increased to a preset value, the output air pressure is not increased along with the continuous increase of the input air pressure, so that the effect of pressure limiting is realized.
Further, the application a pressure limiting valve, valve body corresponds valve plug chamber one side and is equipped with the casing, be equipped with the spring in the casing and fill up the piece, the spring is kept away from valve plug one end pressfitting and is filled up on the piece, still includes the pressure regulating pole, the pressure regulating pole is used for supporting the spring and fills up piece and keep away from spring and fill up piece one side, the pressure regulating pole can axial adjustment remove. As a preferred scheme of the application, the pressure regulating rod and the spring cushion are used for regulating the compression amount of the spring so as to regulate the upper limit value of the output air pressure.
Further, the application a pressure limiting valve, the cock lid is components of a whole that can function independently spare with the cock stem, the cock lid is kept away from cock stem one end butt and is had the pressure spring, wear to be equipped with the overflow port on the cock stem, the overflow port axial runs through the valve plug, be equipped with the pressure release hole on the casing. According to the preferable scheme, based on the structure, when the pressure exceeding the set value is instantaneously input to the runner inlet or the input end and the output end are reversely connected, the plug rod and the plug cover can be axially separated, and then the gas can be discharged from the overflow hole to the pressure relief hole on the shell.
Further, according to the pressure limiting valve, a limiting groove is formed in the cavity of the valve body, corresponding to the radial periphery of the plug cover, and the plug cover is arranged in the limiting groove in a sliding mode. As a preferable scheme of the plug cover positioning device, the limiting groove is used for radially positioning the plug cover. It should be noted that: the plug cover is arranged in the limit groove in a sliding manner, and does not form annular seal on the inner wall between the plug cover and the limit groove.
Further, the pressure limiting valve further comprises a valve cover, the valve cover is arranged on the valve body, and one end, away from the plug cover, of the pressure spring is abutted to the valve cover.
Further, according to the pressure limiting valve, the mounting groove which is matched with the outer diameter of the valve cover is formed in the valve body, the limiting edge is arranged on the inner wall of the mounting groove, the sealing ring is arranged on the limiting edge, and the valve cover is arranged on the sealing ring; the inner wall of the mounting groove is also provided with a clamp spring groove, a limit clamp spring is arranged in the clamp spring groove, and the bottom of the limit clamp spring is in butt joint with the valve cover. As the preferred scheme of this application, make the valve gap pressfitting on the sealing washer through spacing jump ring to promote the leakproofness between valve gap and the valve body.
Further, in the pressure limiting valve, a sealing flange is arranged on the radial outer side of one end of the stopper cover of the flow passage Kong Jin. As a preferred embodiment of the present application, the plug cap is pressed onto the sealing flange to shut off the flow path between the flow path inlet and the flow path outlet.
The output stability control method of the pressure limiting valve comprises the following steps:
step (1): determining a maximum input pressure P1, a maximum output pressure P2 and a minimum preset deviation proportion eta of the allowable output pressure according to working conditions, wherein eta= (P2-delta P)/P2, and delta P is a preset maximum fluctuation value of the allowable output pressure;
step (2): determining an inner diameter dimension of the valve plug cavity;
step (3): according to the formula: determining S2 by eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1, and determining the radial dimension S1 corresponding to the sealing area formed by pressing the plug cover on the upper end of the runner hole as the effective sealing area of the plug cover, wherein S2 is the effective sealing area of the valve plug;
step (4): obtaining a pressure limiting valve meeting the requirement of the step (3);
step (5): under the working condition that the input pressure is P2, the pressure regulating rod is regulated until the output pressure is P2;
step (6): the pressure regulating rod is limited so that the pressure regulating rod cannot axially move, and the phenomenon that the output pressure is influenced by inaccurate spring pressure caused by axial movement of the pressure regulating rod in the using process is prevented.
The technical scheme can be seen that the invention has the following beneficial effects:
the invention provides a pressure limiting valve and a control method for output stability of the pressure limiting valve, which are characterized in that the structural size is determined according to the preset maximum input pressure, the preset output pressure and the minimum preset deviation ratio of the allowable output pressure, the fluctuation range of an output end is controllable, and the deviation ratio corresponding to the fluctuation range can be ensured to be not smaller than a preset value.
Drawings
FIG. 1 is a cross-sectional view of a pressure limiting valve according to an embodiment of the present application;
FIG. 2 is an enlarged partial view of the area A of FIG. 1;
FIG. 3 is an exploded view of a pressure limiting valve according to an embodiment of the present application;
FIG. 4 is a graph of the input/output air pressure of a pressure limiting valve according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram showing the correspondence between equations 1 and 2 and fig. 4 according to the embodiment of the present application.
In the figure: 1-a valve body; 101-a runner inlet; 102-a runner outlet; 11-runner holes; 12-a limit groove; 13-a protrusion; 14-a mounting groove; 140-limiting edges; 141-a clamp spring groove; 15-sealing the flange; 2-a valve plug; 20-a valve plug cavity; 21-stopper rod; 22-plug cover; 23-a compression spring; 24-overflow aperture; 3-a spring; 4-a housing; 41-spring pad; 42-pressure regulating rod; 5-a valve cover; 6, a sealing ring; 7-limiting snap springs.
Detailed Description
Example 1
The pressure limiting valve as shown in fig. 1 to 3 comprises a valve body 1, wherein a valve plug cavity 20 is arranged at the bottom of the valve body 1, a valve plug 2 is slidably arranged in the valve plug cavity 20, the valve plug 2 is in sealing fit with the side wall of the valve plug cavity 20, a plug rod 21 is arranged at one end of the valve plug 2, the plug rod 21 extends into the bottom of the valve body 1, and a spring 3 is arranged at one end, far away from the plug rod 21, of the valve plug 2; the bottom of the valve body 1 is provided with a runner hole 11 in a penetrating way, the plug rod 21 is arranged in the runner hole 11, the upper end of the plug rod 21 is provided with a plug cover 22, and the plug cover 22 is arranged on one side, away from the valve plug 2, of the runner hole 11; the valve body 1 is provided with a runner inlet 101 and a runner outlet 102, the runner inlet 101 is communicated with one end of the runner hole 11 near the plug cover 22, and the runner outlet 102 extends to be communicated with the side wall of the runner hole 11;
as shown in fig. 2, in a natural state, the spring 3 presses the valve plug 2 to the plug rod 21 upwards to push the plug cover 22, so that a gap is reserved between the plug cover 22 and the runner hole 11, and the runner between the runner inlet 101 and the runner outlet 102 is communicated;
after the valve plug 2 moves a predetermined distance towards the side far away from the plug cover 22, the plug cover 22 can be pressed against the end of the runner hole 11, so that the runner between the runner inlet 101 and the runner outlet 102 is disconnected.
Based on the structure, the pressure limiting valve is characterized in that:
as shown in fig. 1, the fluid passes through the valve body 1, enters the valve cavity from the flow passage inlet 101, and flows to the flow passage outlet 102 through the flow passage hole 11.
As shown in fig. 2, when fluid enters the upper cavity of the valve plug 2, air pressure is applied to the valve plug 2 by a downward force F2, and when F2 is greater than the preset elastic force of the spring 3, the valve plug 2 moves downward until the plug cover 22 seals the upper end of the flow passage hole 11. If the flow channel outlet 102 is airtight, the output end will maintain pressure at the set value due to the sealing action of the plug cover 22, and the output pressure will not change with the increase of the input; if the flow channel outlet 102 is open outwards, the force F2 of the outlet flow pressure against the valve plug 2 is lower than the predetermined spring force of the spring 3, said spring 3 will push the valve plug 2 so that the plug stem 21 pushes the plug cap 22 open. At this time, the fluid continues to flow from the input end to the output end until the preset output end is pressed to a preset value, and then the fluid is sealed again. Therefore, the aim that the output pressure is not increased and increased after the input pressure is larger than the set value is achieved, and the process is transient and dynamic balance.
Taking ventilation as an example, one end of the runner inlet 101 is used for air intake, one end of the runner outlet 102 is used for air exhaust, and the air sequentially passes through the runner inlet 101, the runner hole 11 and the runner outlet 102, so that the air pressure in the inner cavity of the valve body 1 is balanced in the process. Because the valve plug 2 is sealed and attached to the side wall of the valve plug cavity 20, the valve plug 2 receives the downward air pressure F2, and when the F2 exceeds the preset value, the valve plug 2 will overcome the elastic force of the spring 3 and decrease by a preset distance, so that the valve plug cover 22 cuts off the flow passage between the flow passage inlet 101 and the flow passage outlet 102, and the air pressure at this time is the upper limit of the output air pressure of the flow passage outlet 102. Therefore, the effect of pressure limiting is realized, namely, when the input air pressure is increased to a preset value, the output air pressure is not increased along with the continuous increase of the input air pressure, so that the effect of pressure limiting is realized.
In this embodiment, the valve body 1 is equipped with the casing 4 corresponding to valve plug chamber 20 one side, be equipped with the spring in the casing 4 and fill up piece 41, spring 3 keeps away from valve plug 2 one end pressfitting on spring and fills up piece 41, still includes pressure regulating pole 42, pressure regulating pole 42 is used for supporting spring and fills up piece 41 and keep away from spring and fill up piece 41 one side, pressure regulating pole 42 can axial adjustment remove. The pressure regulating rod 42 and the spring pad 41 are used for regulating the compression amount of the spring 3 so as to regulate the upper limit value of the output air pressure. In this embodiment, the pressure adjusting rod 42 is disposed on the housing 4 in a penetrating manner and is in threaded connection with the housing 4, and the compression amount of the spring 3 can be adjusted by rotating the pressure adjusting rod 42.
As shown in fig. 2, in this embodiment, the plug cover 22 and the plug rod 21 are separate components, one end of the plug cover 22 away from the plug rod 21 is abutted against a compression spring 23, an overflow hole 24 is perforated on the plug rod 21, the overflow hole 24 axially penetrates through the valve plug 2, and a pressure relief hole (not shown) is provided on the housing 4. With the above structure, when the gas pressure exceeding the set value is instantaneously inputted to the flow channel inlet 101 or the input and output ends are reversely connected, the plug rod 21 and the plug cover 22 can be axially separated, and the gas can be discharged from the overflow hole 24 to the pressure release hole on the housing 4.
As shown in fig. 2 and 3, in this embodiment, a limiting groove 12 is disposed in the cavity of the valve body 1 corresponding to the radial outer periphery of the plug cover 22, and the plug cover 22 is slidably disposed in the limiting groove 12. The limiting groove 12 is used for radially positioning the plug cover 22. It should be noted that: the plug 22 is slidably disposed in the limit groove 12, and does not form an annular seal on behalf of the inner wall between the plug 22 and the limit groove 12, in this embodiment, the limit groove 12 is formed by a set of circumferentially spaced protrusions 13, and the limit groove 12 corresponds to the inner wall of the protrusions 13.
In this embodiment, as shown in fig. 1 and 3, the valve further comprises a valve cover 5, the valve cover 5 is covered on the valve body 1, and one end of the pressure spring 23, which is far away from the plug cover 22, is abutted on the valve cover 5. In this embodiment, the valve body 1 is provided with a mounting groove 14 adapted to the outer diameter of the valve cover 5, the inner wall of the mounting groove 14 is provided with a limit edge 140, the limit edge 140 is provided with a sealing ring 6, and the valve cover 5 is arranged on the sealing ring 6; the inner wall of the mounting groove 14 is also provided with a clamp spring groove 141, a limit clamp spring 7 is arranged in the clamp spring groove 141, and the bottom of the limit clamp spring 7 is abutted with the valve cover 5. The valve cover 5 is pressed on the sealing ring 6 through the limiting clamp spring 7, so that the tightness between the valve cover 5 and the valve body 1 is improved.
In this embodiment, as shown in fig. 2, a sealing flange 15 is disposed radially outside the end of the runner hole 11 near the plug 22. The plug 22 is pressed against the sealing flange 15 to shut off the flow path between the flow path inlet 101 and the flow path outlet 102.
In this embodiment, the effective sealing area S1 of the plug 22 and the effective sealing area S2 of the valve plug 2 satisfy the formula: eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1; wherein, P1 is a preset maximum input pressure, P2 is a preset maximum output pressure, η is a preset minimum deviation ratio of the allowable output pressure, where η= (p2—Δp)/P2, Δp is a preset maximum fluctuation value of the allowable output pressure.
S1, namely the plug cover 22 is pressed and bonded on the area corresponding to the sealing area formed at the upper end of the runner hole 11; s2 is the cross-sectional area of the valve plug cavity 20; according to the characteristics, the pressure limiting valve disclosed by the application has the fluctuation range of the pressure output by the fluid from the end of the flow passage outlet 102 of [ P2', P2], and P2'/P2 is larger than or equal to eta, namely P2 '. Gtoreq.P 2-delta.P. Therefore, output fluctuation can be controlled, and the method has the advantage of good reliability. The pressure limiting valve needs to preset the maximum input pressure and the output pressure according to working conditions, and the output pressure is determined by adjusting the pressure regulating rod 42. Although in an ideal situation the output pressure is constant. However, in actual working, the output pressure will fluctuate, if the fluctuation is too large, the output end executor will not operate stably, so, under the working condition that the stability requirement of the output execution end is higher, for example, when the output end executor is applied to an air suspension, the minimum preset deviation ratio eta of the allowable output pressure will be preset to control the fluctuation range of the output pressure. According to the pressure limiting valve, the structural size is determined according to the preset maximum input pressure and output pressure and the minimum preset deviation proportion eta of the allowable output pressure, the characteristic that the fluctuation range of the output end is controllable is achieved, and the deviation proportion P2'/P2 corresponding to the fluctuation range can be ensured to be not smaller than eta.
Taking the delivery flow of the valve body as gas as an example, the analysis of the fluctuation of the output air pressure is caused as follows:
the input air pressure is gradually increased from 0bar, the elastic force of the spring 3 is fs=f2=pos 2 when the stopper 22 is about to seal, and the output air pressure is Po. When the pressure continues to increase, as the plug cover 22 contacts and seals with the housing, a pressure f1= (Pi-Po) S1 is generated between the upper ends of the plug cover 22 due to the pressure difference between Pi and Po, and if the output end is sealed at this time, the pressure Po of the output end will not change; if the output end is exhausted at this time, the valve plug can be jacked up by the pressure F2 of the output end to the valve plug when F1+F2 is less than or equal to Fs due to the generation of F1, and the input end can be supplemented with air, so that the output pressure Po can be reduced to a preset value to start supplementing air by the system. Since the elastic force Fs of the spring 3 can be regarded as a constant value, the larger the F1, the smaller the F2, and the pressure Po at the output end decreases with an increase in Pi as shown in fig. 4 during the continuous boosting of the input end, resulting in a deviation amount.
Therefore, in order to control the deviation value of the output pressure fluctuation. The following parameters can be determined according to the actual working conditions: the maximum working pressure of the input end is P1, the maximum pressure allowed by the output end is P2, and the minimum deviation ratio allowed by the output end is eta.
Then, as shown in fig. 5, the input end effective area S1 and the output end effective area S2 satisfy the following equation:
equation 1: fs=p2s1+p2s2: equation 2: fs= (p1_ηp2) s1+ηp2s2.
In equation 1, since the valve is just sealed, the input end pressure and the output end pressure are the same, P2, and since the elastic force Fs of the spring 3 can be regarded as unchanged, equation 1 and equation 2 can be combined, which is: p2s1+p2s2= (p1—ηp2) s1+ηp2s2, ((p2—p1) s1+p2s2)/(p2s2—p2s1) =η. Because the minimum allowable deviation ratio at the output end is eta, eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1.
Example 2
The embodiment 1 provides a pressure limiting valve output stability control method, which includes the following steps:
step (1): determining a maximum input pressure P1, a maximum output pressure P2 and a minimum preset deviation proportion eta of the allowable output pressure according to working conditions, wherein eta= (P2-delta P)/P2, and delta P is a preset maximum fluctuation value of the allowable output pressure;
step (2): determining an inner diameter dimension of the valve plug cavity 20; it should be noted that: the internal diameter of the plug cavity 20 is sized according to factors including: the installation space dimensions of the actual valve body (determining the outer diameter), the strength under working conditions (determining the wall thickness) and the economy (size minimization).
Step (3): according to the formula: eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1, S2 is determined, then the radial size corresponding to the sealing area formed by pressing the plug cover 22 on the upper end of the runner hole 11 is determined, S1 is the effective sealing area of the plug cover 22, and S2 is the effective sealing area of the valve plug 2; in this embodiment, the radial dimension of the sealing flange 15;
step (4): obtaining a pressure limiting valve meeting the requirement of the step (3);
step (5): under the working condition that the input pressure is P2, the pressure regulating rod 42 is regulated until the output pressure is P2;
step (6): the pressure regulating rod 42 is limited so that the pressure regulating rod 42 cannot axially move, and the phenomenon that the output pressure is influenced by inaccurate pressure of the spring 3 due to axial movement of the pressure regulating rod 42 in the use process is prevented. Specifically, the portion of the pressure adjusting lever 42 exposed outside the housing 4 may be molded.
The technical principles of the present invention have been described above in connection with specific embodiments, which are provided for the purpose of explaining the principles of the present invention and are not to be construed as limiting the scope of the present invention in any way. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (8)
1. The utility model provides a pressure limiting valve, includes valve body (1), valve body (1) bottom is equipped with valve plug chamber (20), the interior slip in valve plug chamber (20) is equipped with valve plug (2), valve plug (2) and valve plug chamber (20) lateral wall seal laminating, valve plug (2) one end is equipped with cock stem (21), cock stem (21) extend into valve body (1) bottom, valve plug (2) are kept away from cock stem (21) one end and are equipped with spring (3);
the bottom of the valve body (1) is provided with a runner hole (11) in a penetrating way, the plug rod (21) is arranged in the runner hole (11), the upper end of the plug rod (21) is provided with a plug cover (22), and the plug cover (22) is arranged on one side, far away from the valve plug (2), of the runner hole (11);
the valve body (1) is provided with a runner inlet (101) and a runner outlet (102), the runner inlet (101) is communicated with one end of the runner hole (11) close to the plug cover (22), and the runner outlet (102) extends to be communicated with the side wall of the runner hole (11);
the plug cover (22) can be pressed at the end part of the runner hole (11) until the runner between the runner inlet (101) and the runner outlet (102) is disconnected;
the method is characterized in that: the effective sealing area S1 of the plug cover (22) and the effective sealing area S2 of the valve plug (2) meet the formula: eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1;
wherein, P1 is a preset maximum input pressure, P2 is a preset maximum output pressure, η is a preset minimum deviation ratio of the allowable output pressure, where η= (p2—Δp)/P2, Δp is a preset maximum fluctuation value of the allowable output pressure.
2. A pressure limiting valve as defined in claim 1, wherein: the valve body (1) corresponds valve plug chamber (20) one side and is equipped with casing (4), be equipped with spring pad spare (41) in casing (4), valve plug (2) one end pressfitting is kept away from in spring (3) on spring pad spare (41), still includes pressure regulating pole (42), pressure regulating pole (42) are used for supporting spring pad spare (41) and keep away from spring pad spare (41) one side, pressure regulating pole (42) can axial adjustment remove.
3. A pressure limiting valve as defined in claim 2, wherein: the plug cover (22) and the plug rod (21) are split pieces, one end, away from the plug rod (21), of the plug cover (22) is abutted to a pressure spring (23), an overflow hole (24) is formed in the plug rod (21) in a penetrating mode, the overflow hole (24) axially penetrates through the valve plug (2), and a pressure relief hole is formed in the shell (4).
4. A pressure limiting valve as defined in claim 3, wherein: and a limiting groove (12) is formed in the cavity of the valve body (1) corresponding to the radial periphery of the plug cover (22), and the plug cover (22) is arranged in the limiting groove (12) in a sliding manner.
5. A pressure limiting valve as defined in claim 3, wherein: the valve further comprises a valve cover (5), the valve cover (5) is arranged on the valve body (1) in a covering mode, and one end, away from the plug cover (22), of the pressure spring (23) is abutted to the valve cover (5).
6. A pressure limiting valve as defined in claim 2, wherein: the valve body (1) is provided with a mounting groove (14) which is matched with the outer diameter of the valve cover (5), the inner wall of the mounting groove (14) is provided with a limiting edge (140), the limiting edge (140) is provided with a sealing ring (6), and the valve cover (5) is arranged on the sealing ring (6); the inner wall of the mounting groove (14) is also provided with a clamp spring groove (141), a limit clamp spring (7) is arranged in the clamp spring groove (141), and the bottom of the limit clamp spring (7) is abutted to the valve cover (5).
7. A pressure limiting valve as defined in claim 2, wherein: a sealing flange (15) is arranged on the radial outer side of one end of the runner hole (11) close to the plug cover (22).
8. A pressure limiting valve output stability control method based on the pressure limiting valve according to any one of claims 2-7, characterized in that: the method comprises the following steps:
step (1): determining a maximum input pressure P1, a maximum output pressure P2 and a minimum preset deviation proportion eta of the allowable output pressure according to working conditions, wherein eta= (P2-delta P)/P2, and delta P is a preset maximum fluctuation value of the allowable output pressure;
step (2): determining an inner diameter dimension of the valve plug cavity (20);
step (3): according to the formula: determining S2 by eta is less than or equal to ((P2-P1) S1+P2S2)/(P2S 2-P2S 1) is less than or equal to 1, and determining that the radial dimension S1 corresponding to the sealing area formed by pressing the plug cover (22) on the upper end of the runner hole (11) is the effective sealing area of the plug cover (22), and S2 is the effective sealing area of the valve plug (2);
step (4): obtaining a pressure limiting valve meeting the requirement of the step (3);
step (5): under the working condition that the input pressure is P2, the pressure regulating rod (42) is regulated until the output pressure is P2;
step (6): the pressure regulating rod (42) is limited so as not to move axially.
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| CN202311824483.2A CN117469447B (en) | 2023-12-28 | 2023-12-28 | Pressure limiting valve and output stability control method thereof |
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| CN202311824483.2A CN117469447B (en) | 2023-12-28 | 2023-12-28 | Pressure limiting valve and output stability control method thereof |
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| CN117469447B CN117469447B (en) | 2024-04-16 |
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| WO2020002337A1 (en) * | 2018-06-29 | 2020-01-02 | Siemens Schweiz Ag | Control valve |
| CN111043365A (en) * | 2019-11-19 | 2020-04-21 | 武汉大禹阀门股份有限公司 | High-pressure-difference water-control piston type pressure reducing valve |
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2023
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| FR1532855A (en) * | 1966-10-14 | 1968-07-12 | Flair Mfg Corp | Fluid flow control valve |
| GB1283908A (en) * | 1969-11-06 | 1972-08-02 | Midland Ross Corp | Pressure proportioning valve assembly for hydraulic brake systems |
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| CN117469447B (en) | 2024-04-16 |
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