CN-122014868-A - Micro-power pilot valve with conical valve core and optimal design method thereof

CN122014868ACN 122014868 ACN122014868 ACN 122014868ACN-122014868-A

Abstract

The invention discloses a micro-power pilot valve with conical valve core and its optimizing design method, belonging to the technical field of pressure reducing valve, and calculating the water inlet and outlet flow rate of the pilot upper cavity based on the Bernoulli equation and the Darcy-Weissebach equation, and then obtaining the minimum water inlet and outlet volume of the pilot upper cavity, so as to calculate the minimum action stroke of the upper diaphragm. The minimum flow area of the conical valve core is determined, and based on the mechanical balance relation between the pressure of the upper cavity of the main pressure reducing valve and the conical valve core, the constraint condition of the minimum opening of the pilot valve is constructed, so that the pilot valve meets the regulation requirement under the extreme working condition. The equivalent flow area based on the maximum travel of the pilot valve is equal to the flow area of the pilot valve line, the maximum travel of the pilot valve is obtained. The invention systematically solves the bottleneck of the traditional pilot-operated pressure reducing valve in the aspects of dynamic response, energy dependence, adjustment precision and flow management, and has better practicability.

Inventors

TANG YONG
ZHAO JIAN
Xia Zexin
ZHOU WEI
YANG HUI
LUO YUHANG
Fang Luchong
HU KUAN

Assignees

奥凸科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260119
Priority Date: 20251029

Claims (11)

1. The micro-power pilot valve with the conical valve core is characterized by comprising a valve body, an upper diaphragm, a lower diaphragm and the conical valve core, wherein the upper diaphragm and the lower diaphragm are respectively arranged at the upper end and the lower end of the interior of the valve body in a sliding manner, the interior of the valve body is sequentially divided into a pilot upper cavity, an atmospheric cavity and a pilot cavity from top to bottom, and the conical valve core is arranged in the pilot cavity; The valve plug is of a conical structure, the bottom of the valve plug is connected with the valve body through a pilot lower spring, the top of the valve plug is connected with a lower diaphragm, and a pilot upper spring is arranged between the upper diaphragm and the lower diaphragm.
2. The micro-power pilot valve with a conical valve core according to claim 1, wherein the upper end of the pilot cavity is communicated with the water outlet of the main pressure reducing valve through a pipeline, and the lower end of the pilot cavity is communicated with the upper cavity of the main pressure reducing valve through a pipeline.
3. The micro-power pilot valve with conical valve core according to claim 1, wherein the equivalent diameter ratio of the upper diaphragm and the lower diaphragm is: ; Wherein Du is the equivalent diameter of the upper diaphragm; Dd is the equivalent diameter of the lower diaphragm; is the area proportionality coefficient of the upper diaphragm and the lower diaphragm.
4. The micro-power pilot valve with conical spool according to claim 1, wherein the relationship between the top diameter and the bottom diameter of the spool is: ; the flow area of the conical surface valve core is as follows: ; Wherein: the conical surface angle of the valve plug of the conical surface valve core; The stroke of the valve plug of the conical valve core is as follows; Cone height of the valve plug of the conical valve core; l1 is the bottom diameter of the valve plug of the conical valve core; l2 is the top diameter of the valve plug of the conical valve core.
5. An optimization design method of a micro-power pilot valve with a conical valve core, which is used for optimizing and designing the micro-power pilot valve with the conical valve core according to any one of claims 1-4, and is characterized by comprising the following steps: step S1, calculating the water inlet and outlet flow rate of the pilot upper cavity based on a Bernoulli equation and a Darcy-Weissebach equation, and then obtaining the minimum water inlet and outlet volume VT of the pilot upper cavity based on the water inlet and outlet flow rate, so as to calculate the minimum action stroke lT of the upper diaphragm as follows: ; Wherein Su is the equivalent area of the upper membrane; step S2, based on the minimum inlet and outlet water volume VT and the minimum action stroke of the upper diaphragm Determining the minimum flow area of a conical valve core, and constructing constraint conditions of the minimum opening of the pilot valve based on the mechanical balance relation between the pressure of the upper cavity of the main pressure reducing valve and the conical valve core, so that the pilot valve meets the regulation requirement under the extreme working condition, wherein the constraint conditions are as follows: ; Wherein: the upper cavity pressure generated by the pilot valve under the minimum flow area; The pressure of the upper cavity of the main reducing valve; Is a pressure redundancy coefficient; and step S3, obtaining the maximum stroke of the pilot valve based on the fact that the equivalent flow area of the maximum stroke of the pilot valve is equal to the flow area of the pilot valve pipeline.
6. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 5, wherein in the step S1, the water inlet and outlet flow rate of the pilot upper cavity is: ; Wherein: the pre-valve pressure of the main reducing valve; Is at standard atmospheric pressure; is the inner diameter of the pipeline; is the coefficient of frictional resistance along the way; is the length of the pipeline; Is fluid density (kg/m 3); the minimum water inlet and outlet volume VT of the pilot upper cavity is as follows: ; Wherein: Is the minimum actuation cycle time of the solenoid valve.
7. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 5 or 6, wherein in the step S1, the equivalent area Su of the upper diaphragm is: ; where Du is the equivalent diameter of the upper diaphragm.
8. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 5, wherein in the step S2, the minimum flow area of the conical valve core The method comprises the following steps: ; Wherein: the conical surface angle of the valve plug of the conical surface valve core; Cone height of the valve plug of the conical valve core; The stroke of the valve plug of the conical valve core is as follows; l2 is the top diameter of the valve plug of the conical valve core.
9. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 8, wherein in the step S2, the constructing constraint condition includes the following steps: (1) Based on the actual working condition and the minimum design pressure behind the valve, estimating the low peak flow QL of the main pressure reducing valve through a Bernoulli equation and a West-Weissebach formula; ; Wherein: the design pressure of the main pressure reducing valve; The pressure after the valve in the valley period is the main pressure reducing valve; The flow rate is the peak time flow rate of the main pressure reducing valve; To develop the final outlet pressure of the downstream system; (2) Calculating the minimum flow area AL of the main pressure reducing valve based on the low peak flow QL of the main pressure reducing valve; ; Wherein: the flow coefficient of the main pressure reducing valve; (3) Based on the minimum flow area AL, the spring deformation amount of the main relief valve is calculated And then calculate the pressure of the upper cavity of the main reducing valve ; ; ; Wherein: The spring deformation amount of the main pressure reducing valve; the hooke's coefficient of the spring that is the primary relief valve; dmian-u is the diameter of the membrane of the upper cavity of the main pressure reducing valve; dmian is the diameter of the valve core cylinder of the main pressure reducing valve; (4) Calculating upper cavity pressure generated by pilot valve under minimum flow area ; ; Wherein: the pressure in front of the main reducing valve; coefficient of frictional resistance along the way (related to pipe wall roughness); equivalent length of the pipeline arranged on the pilot cavity; the length of a pipeline between the pilot cavity and the upper cavity of the main pressure reducing valve; the length of the pipeline between the pilot cavity and the main decompression valve cavity; The diameter of the equivalent pipeline; the flow coefficient of the conical surface valve core connecting pipeline; the flow coefficient of the conical valve core; The cross section area of the inlet of the conical valve core; the cross section area of the outlet of the conical valve core is shown.
10. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 5, wherein in the step S3, the maximum stroke Δhmax of the pilot valve is: ; Wherein L2 is the top diameter of the valve plug of the conical valve core; Cone height of the valve plug of the conical valve core; the conical surface angle of the valve plug of the conical surface valve core; is the equivalent coefficient of the flow area of the maximum stroke.
11. The method for optimizing design of a micro-power pilot valve with a conical valve core according to claim 5, wherein in the step S3, the Huke coefficient of the pilot spring is as follows The method comprises the following steps: ; Total length of pilot lower spring of pilot valve The method comprises the following steps: ; Wherein: the hooke coefficient of the pilot upper spring; the initial compression amount of the spring; Is the spring compression rate.

Description

Micro-power pilot valve with conical valve core and optimal design method thereof Technical Field The invention belongs to the technical field of pressure reducing valves, and particularly relates to a micro-power pilot valve with a conical valve core and an optimal design method thereof. Background The pilot pressure reducing valve is a hydraulic or pneumatic control element for controlling the action of the main pressure reducing valve through the pressure change of a pilot cavity, and is widely applied to the fields of industrial automation, engineering machinery, coal mine hydraulic support systems and the like. The pilot-operated pressure reducing valve has the core advantages that the pilot signal with small flow is utilized to adjust the large-flow output pressure of the main pressure reducing valve, so that the accurate control of the system pressure is realized. The pilot-operated pressure reducing valve in the prior art is mostly dependent on an adjusting spring thimble or a mechanical adjusting mechanism to change the deformation of a spring so as to realize the setting of the pressure of pressure reduction. However, when the pressure of the pressure relief is regulated, the spring ejector pin needs to be manually and frequently operated to easily cause the failure of the spring ejector pin, and the mechanical regulation type pressure relief valve faces two major challenges, namely, on one hand, the mechanical mechanism is easy to fail or fail due to long-term use, and on the other hand, the regulation power requirement is larger, for example, the regulation power is required to depend on mains supply, so that the engineering application is limited. In addition, the mechanical regulation type pressure reducing valve also has the problem of insufficient regulation precision, and the flow area of the valve core presents nonlinear characteristics, so that the accuracy of pressure regulation is further reduced. Disclosure of Invention The invention aims to provide a micro-power pilot valve with a conical valve core and an optimal design method thereof, and aims to solve the problems. The invention is realized mainly by the following technical scheme: The micro-power pilot valve with the conical valve core comprises a valve body, an upper diaphragm, a lower diaphragm and the conical valve core, wherein the upper diaphragm and the lower diaphragm are respectively arranged at the upper end and the lower end of the interior of the valve body in a sliding manner, the interior of the valve body is sequentially divided into a pilot upper cavity, an atmospheric cavity and a pilot cavity from top to bottom, and the conical valve core is arranged in the pilot cavity; The valve plug is of a conical structure, the bottom of the valve plug is connected with the valve body through a pilot lower spring, the top of the valve plug is connected with a lower diaphragm, and a pilot upper spring is arranged between the upper diaphragm and the lower diaphragm. In order to better realize the invention, the upper end of the pilot cavity is communicated with the water outlet of the main pressure reducing valve through a pipeline, and the lower end of the pilot cavity is communicated with the upper cavity of the main pressure reducing valve through a pipeline. In order to better realize the invention, further, the equivalent diameter ratio of the upper membrane and the lower membrane is: Wherein Du is the equivalent diameter of the upper diaphragm; Dd is the equivalent diameter of the lower diaphragm; is the area proportionality coefficient of the upper diaphragm and the lower diaphragm. To better implement the present invention, further, the relationship between the top diameter and the bottom diameter of the valve plug is: ; the flow area of the conical surface valve core is as follows: ; Wherein: the conical surface angle of the valve plug of the conical surface valve core; The stroke of the valve plug of the conical valve core is as follows; Cone height of the valve plug of the conical valve core; l1 is the bottom diameter of the valve plug of the conical valve core; l2 is the top diameter of the valve plug of the conical valve core. An optimization design method of a micro-power pilot valve with a conical valve core is used for optimally designing the micro-power pilot valve with the conical valve core, and is characterized by comprising the following steps: step S1, calculating the water inlet and outlet flow rate of the pilot upper cavity based on a Bernoulli equation and a Darcy-Weissebach equation, and then obtaining the minimum water inlet and outlet volume VT of the pilot upper cavity based on the water inlet and outlet flow rate, so as to calculate the minimum action stroke lT of the upper diaphragm as follows: ; Wherein Su is the equivalent area of the upper membrane; step S2, based on the minimum water inlet and outlet volume Minimum motion travel with upper diaphragmDetermining the minimum flow area of a conic