A water inlet valve, flow rate calculation and verification method and calculation and verification device

Abstract

The present invention relates to the field of valve bodies, and provides a water inlet valve, a flow calculation and verification method, and a calculation and verification device. The water inlet valve includes a valve body, a central channel is provided in the middle of the valve body, a flow control device is provided on the outer side of the central channel, and the flow control device includes a flow seat, and a plurality of flow columns are provided on the flow seat, and the flow columns are made of elastic material; a water flow area is provided between the flow seat and the central channel; the valve body is used in conjunction with a rubber sheet, and a hollow water flow gap is formed between two adjacent flow columns, the flow seat and the rubber sheet, and the water flow gap is connected to the water flow area. The present invention is based on an analysis system and a calculation method for flow and pressure characteristics that combine variables and constant factors of a water inlet valve. The variables are the heights of different flow columns of the flow seat under different pressures and the water flow area between the rubber sheets, and the purpose is to analyze and grasp the flow change values ​​achieved under different pressure ranges. The model in the present invention can be applied on a computer or independently.

Description

Technical Field

[0001] The invention belongs to the field of valve bodies, and relates to a water inlet valve, and in particular to a water inlet valve, a flow calculation and verification method, and a calculation and verification device. Background Art

[0002] The water inlet valve is a common valve body, which usually has only two working states: fully open or fully closed, and cannot be used to adjust the flow rate. Most of the water inlet valves that can be used to adjust the flow rate in China are imported and produced from Europe, the United States or Japan, and can only use existing, designed valves. At present, my country lacks a lot of theories in designing valve structure and calculating the flow rate of valves, and cannot truly realize the production line of independent research and development, independent calculation and independent production. Although the demand for valves in China is increasing, part of the profits still flow abroad, and the cost cannot be reduced. Summary of the invention

[0003] The purpose of the present invention is to provide a water inlet valve, a flow rate calculation and verification method and a calculation and verification device in view of the above-mentioned problems existing in the prior art.

[0004] The objective of the present invention can be achieved through the following technical solutions: a water inlet valve, comprising a valve body, a central channel is provided in the middle of the valve body, a flow control device is provided on the outer side of the central channel, the flow control device comprises a flow seat, a plurality of flow columns are provided on the flow seat, and the flow columns are made of elastic material; a water flow area is provided between the flow seat and the central channel; the valve body is used in conjunction with a rubber sheet, a hollow water flow gap is formed between the two adjacent flow columns, the flow seat and the rubber sheet, and the water flow gap is communicated with the water flow area.

[0005] The working principle of the present invention is as follows: the fluid enters the water inlet valve through the water supply system, and the fluid is divided into two parts in the water inlet valve: one part passes through the porous plate of the central channel, and the other part passes through the water gap between the flow seat, the flow column and the rubber sheet, flows into the water flow area, and then the two parts of the fluid merge. When the water inlet pressure increases, the rubber sheet deforms toward the flow seat and adheres to the flow column. The water inlet valve is adjusted according to the pressure requirements and tolerance accuracy and requirements within the specified range to obtain the gap size of the total water flow, and the nonlinear curve strain characteristics of the rubber sheet deformation variable can be provided through the different height dimensions of the flow column.

[0006] Preferably, the flow column is divided into a plurality of flow column groups symmetrical about the central axis, each flow column group has a different height, and the water inlet valve can control the flow rate by means of the different height dimensions of the flow column.

[0007] Preferably, each flow column group includes four flow columns, with the midpoint of the central channel as the center, and the four flow columns are symmetrical in pairs to avoid skewing of the rubber sheet.

[0008] Preferably, the flow column is made of rubber.

[0009] Preferably, a porous plate is provided in the central channel.

[0010] A calculation and verification method for checking the flow rate of a water inlet valve comprises the following steps:

[0011] S1. Define the height of the highest flow column as h0, define Δh as x·h0, and define the height of the flow column when compressed to the maximum extent as h1;

[0012] S2, define h as h0-n·Δh, where n=0, 1, 2, ..., h gradually decreases until h is less than or equal to h1, and obtain several values ​​of h;

[0013] S3. Calculate the pressure p of the water inlet valve corresponding to each h value (i) ,

[0014] S4. Calculation and simulation to derive the constant resistance coefficient ζ of the porous plate in the central channel c The variable resistance coefficient ζ of the water gap on the flow seat g ;

[0015] S5. Calculate the total resistance coefficient ζ,

[0016] S6. Calculate the flow rate Q of the water inlet valve corresponding to each h value i ,

[0017] S7. Output p(i) and Qi.

[0018] Preferably, the calculation and verification method for checking the flow rate of the water inlet valve further comprises: S8, converting the p obtained in step S4 into (i) As the horizontal axis, Qi obtained in step S7 is used as the vertical axis to obtain a water inlet valve performance test curve, and the performance test curve expresses the relationship between the input pressure and the output flow of the water inlet valve.

[0019] Preferably, the resistance coefficient of the water inlet valve can be calculated using the following model:

[0020] Constant resistance coefficient ζ of the porous plate in the central channel c is constant and can be defined based on simple experiments and / or numerical simulations of detailed geometries;

[0021] For the variable resistance coefficient ζ existing in the water gap on the flow seat g , we must first obtain the variable resistance range h∈[0,max(h ri)] The width of the water gap ζ g =ζ g (h) is obtained through experimental measurement and / or detailed mathematical simulation calculations;

[0022] As a first approximation, the following approach can be used. A simple geometric numerical simulation (axisymmetric configuration without flow column) is performed and the relationship is defined: g =f0(h), and then a correction factor ψ is introduced to match the geometric gap.

[0023] Preferably, the calculation and verification method for verifying the flow rate of the water inlet valve also includes the following basic model assumptions:

[0024] a. The fluid is incompressible;

[0025] b. The liquid enters the water inlet valve from the water inlet cavity on one side of the rubber sheet and flows out from the water outlet cavity on the other side of the water inlet valve. The water inlet cavity pressure p1 and the water outlet cavity pressure p2 are constant by default, the water outlet cavity pressure p2=0, and the water inlet cavity pressure is set to p1=p; this assumption is reasonable because the flow rate at the porous plate and the water gap is much greater than that at the water inlet cavity and the water outlet cavity, and the water outlet cavity can be considered as a water storage container.

[0026] c. Under the action of each independent water inlet pressure value p, the flow state of the water inlet chamber and the water outlet chamber is stable;

[0027] d. Assume that the average pressure of the flow seat below the water gap side is equal to the external pressure of zero; numerical simulation shows that for p = 0.1..1MPa, the maximum error of this assumption is 5%.

[0028] e. The elastic force on each set of flow columns of the same height is proportional to the deformation of the rubber sheet after the flow columns and the rubber sheet come into contact; the total elastic force of the rubber sheet is the sum of the elastic forces of each set of flow columns.

[0029] Preferably, the flow rate of the water inlet valve and the pressure borne by the water inlet valve can be derived and calculated using the following formula:

[0030] Within the range of assumptions made, the perforated plate in the central channel is set to have a constant resistance coefficient ζ c , a variable resistance coefficient ζ is set for the water gap g , the total flow is the sum of the two flows:

[0031] Q=Q c +Q g (Formula 1)

[0032] For turbulent flow conditions, there is a quadratic relationship between pressure and velocity corresponding to each resistance:

[0033]

[0034]

[0035] For the entire valve:

[0036] p=ζQ 2 (Formula 4)

[0037] From equations 1 to 4, it can be deduced that the total drag coefficient ζ and the constant drag coefficient ζ c , variable resistance coefficient ζ g The relationship between is shown in Equation 5:

[0038]

[0039] Detailed numerical simulations confirm that the above assumed fluid system uses Equation 5 with a tolerance within 4%;

[0040] Assume that all flow columns have the same diameter d r , then the cross-sectional area of ​​each flow column is:

[0041]

[0042] According to the model assumption e, the elastic force applied by each pair of flow columns on the rubber sheet is equal to

[0043]

[0044] E represents the elastic modulus of the rubber part under specific deformation conditions, l0 is the initial thickness of the rubber sheet, l i It is the deformation of the rubber part when the flow column at a specified height contacts. The deformation of the rubber part can be calculated based on the width of the gap:

[0045] l0-l i =max((h ri -h),0) (Formula 8)

[0046] h ri is the height of the i-th flow column. When the existing gap width h is greater than the height h of the flow column ri When it is high, follow formula 8;

[0047] Based on the above equations 7 and 8, the total deformation force of the rubber part is defined as:

[0048]

[0049] In formula 9, n is the number of flow columns;

[0050] Based on the model assumption d, the total pressure on the flow seat is defined as:

[0051] F p =pS g (Formula 10)

[0052] Among them, S g It is the surface part of the flow seat exposed to the flow on the water gap side;

[0053] According to the balance of forces, we get F r =F p , and the following formula 11 is derived based on formula 9 and formula 10. Formula 11 is used to express the relationship between the pressure on the water inlet valve and the gap width:

[0054]

[0055] A device for calculating and verifying the flow rate of a water inlet valve comprises an input end, an output end, one or more processors, a storage device and one or more programs, wherein the one or more programs are stored in the storage device and are configured to be executed by one or more processors, and the program comprises a method for executing the verification of the water inlet valve.

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] 1. The model in the present invention is an analysis system and calculation method of flow and pressure characteristics based on the combination of variable and constant factors of the water inlet valve. The variable is represented by the height of different flow columns of the flow seat under different pressures and the water flow area between the rubber sheets. The purpose is to analyze and grasp the flow change value under different pressure ranges.

[0058] 2. The model in the present invention can be applied on a computer or independently. The geometric dimensions of the flow seat and the rubber sheet are defined by the structure, fluid performance and rubber deformation of the water inlet valve in the present invention, and the flow value range under different pressures is determined. The present invention can also be used to check the function of the water inlet valve test data.

[0059] 3. The water inlet valve of the present invention can be used to control the flow rate to float within a range of 15%. The longer the water inlet valve is used, the smaller the flow rate floating range is. After 5 minutes, the flow rate can be reduced to 5-10%, which plays a role in stabilizing the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a structural schematic diagram of the water inlet valve of the present invention;

[0061] Figure 2 It is a schematic diagram of the structure of the water inlet valve without the rubber sheet;

[0062] Figure 3 is a schematic diagram of the fluid flow entering the water inlet valve;

[0063] Figure 4is a flow chart of a calculation and verification method for verifying the flow rate of a water inlet valve in an embodiment;

[0064] Figure 5 : is a test curve of water inlet valve pressure and flow rate in the embodiment;

[0065] In the figure, 1, valve body; 2, center channel; 3, flow control device; 4, flow seat; 5, flow column; 6, water flow area; 7, rubber sheet; 8, water flow gap; 9, porous plate;

[0066] Q-total flow; Qc-flow of the central channel; Q g - the flow rate of the water gap; ζc- the constant resistance coefficient of the central channel; ζ g - variable resistance coefficient of water gap; p- pressure of water inlet valve; p1- water inlet chamber pressure; p2- water outlet chamber pressure;

[0067] S r – support surface area of ​​the flow column; n – number of flow columns; h r1 ,h r2 ,...h rn – height of each flow column; l0 – strain-free thickness of the rubber sheet (initial thickness); S g – the surface area of ​​the rubber sheet exposed to the flow side of the water gap; E – elastic modulus of the rubber sheet; ζ c – resistance coefficient of the porous plate in the central channel; ζ g =f(h) – resistance coefficient of water gap; ψ – correction factor; p min ,p max – Enter the minimum and maximum values ​​of water pressure; DETAILED DESCRIPTION

[0068] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0069] As shown in the figure, a water inlet valve includes a valve body 1, a central channel 2 is provided in the middle of the valve body 1, a flow control device 3 is provided outside the central channel 2, the flow control device 3 includes a flow seat 4, a plurality of flow columns 5 are provided on the flow seat 4, and the flow columns 5 are made of elastic material; a water passing area 6 is provided between the flow seat 4 and the central channel 2; the valve body 1 is used in conjunction with a rubber sheet 7, and a hollow water passing gap 8 is formed between two adjacent flow columns 5, the flow seat 4 and the rubber sheet 7, and the water passing gap 8 is communicated with the water passing area 6. The flow columns 5 are divided into a plurality of groups of flow columns 5 symmetrically arranged on the central axis, and the height of each group of flow columns 5 is different. The water inlet valve can control the flow rate by the different height dimensions of the flow columns 5. Each group of flow columns 5 includes four flow columns 5, with the midpoint of the central channel 2 as the center, and the four flow columns 5 are symmetrical in pairs to avoid the skew of the rubber sheet 7. The flow columns 5 are made of rubber. A porous plate 9 is provided in the central channel 2.

[0070] The fluid enters the water inlet valve through the water supply system, and the fluid is divided into two parts in the water inlet valve: one part passes through the porous plate 9 of the central channel 2, and the other part passes through the water gap 8 between the flow seat 4, the flow column 5 and the rubber sheet 7, and flows into the water flow area 6, and then the two parts of the fluid merge. When the water inlet pressure increases, the rubber sheet 7 deforms toward the flow seat 4 and adheres to the flow column 5. The water inlet valve is adjusted according to the pressure requirements and tolerance accuracy and requirements within the specified range to obtain the gap size of the total water flow, and the nonlinear curve strain characteristics of the deformation amount of the rubber sheet 7 can be provided through the different height dimensions of the flow column 5.

[0071] Basic assumptions of the model:

[0072] a. The fluid is incompressible;

[0073] b. The liquid enters the water inlet valve from the water inlet cavity on one side of the rubber sheet 7, and flows out from the water outlet cavity on the other side of the water inlet valve. The water inlet cavity pressure p1 and the water outlet cavity pressure p2 are constant by default, the water outlet cavity pressure p2=0, and the water inlet cavity pressure is set to p1=p; this assumption is reasonable because the flow rate at the porous plate 9 and the water gap 8 is much greater than that at the water inlet cavity and the water outlet cavity, and the water outlet cavity can be considered as a water storage container.

[0074] c. Under the action of each independent water inlet pressure value p, the flow state of the water inlet chamber and the water outlet chamber is stable;

[0075] d. Assume that the average pressure of the flow seat 4 below the water gap 8 is equal to the external pressure of zero; numerical simulation shows that for p = 0.1..1 MPa, the maximum error of this assumption is 5%.

[0076] e. The elastic force on each group of flow columns 5 of the same height is proportional to the deformation of the rubber sheet 7 after the flow columns 5 and the rubber sheet 7 come into contact; the total elastic force of the rubber sheet 7 is the sum of the elastic forces of each group of flow columns 5.

[0077] The flow rate of the water inlet valve and the pressure it withstands can be calculated using the following formula:

[0078] Within the range of assumptions made, the porous plate 9 of the central channel 2 is set to a constant resistance coefficient ζ c , the water gap 8 sets a variable resistance coefficient ζ g , the total flow is the sum of the two flows:

[0079] Q=Q c +Q g (Formula 1)

[0080] For turbulent flow conditions, there is a quadratic relationship between pressure and velocity corresponding to each resistance:

[0081]

[0082]

[0083] For the entire valve:

[0084] p=ζQ 2 (Formula 4)

[0085] From equations 1 to 4, it can be deduced that the total drag coefficient ζ and the constant drag coefficient ζ c , variable resistance coefficient ζ g The relationship between is shown in Equation 5:

[0086]

[0087] Detailed numerical simulations confirm that the above assumed fluid system uses Equation 5 with a tolerance within 4%;

[0088] Assume that all flow columns 5 have the same diameter d r , then the cross-sectional area of ​​each flow column 5 is:

[0089]

[0090] According to the model assumption e, the elastic force applied by each pair of flow columns 5 on the rubber sheet 7 is equal to

[0091]

[0092] E represents the elastic modulus of the rubber under specific deformation conditions, l0 is the initial thickness of the rubber sheet 7, l i is the deformation of the rubber part when the flow column 5 at a specified height contacts. The deformation of the rubber part can be calculated based on the width of the gap:

[0093] l0-l i =max((hri -h),0) (Formula 8)

[0094] h ri is the height of the i-th flow column 5. When the existing gap width h is greater than the height h of the flow column 5 ri When it is high, follow formula 8;

[0095] Based on the above equations 7 and 8, the total deformation force of the rubber part is defined as:

[0096]

[0097] In formula 9, n is the number of flow columns 5;

[0098] According to the model assumption d, the total pressure on the flow seat 4 is defined as:

[0099] F p =pS g (Formula 10)

[0100] Among them, S g The surface portion of the flow seat 4 exposed to the flow on the side of the water gap 8;

[0101] According to the balance of forces, we get F r =F p , and the following formula 11 is derived based on formula 9 and formula 10. Formula 11 is used to express the relationship between the pressure on the water inlet valve and the gap width:

[0102]

[0103] A calculation and verification method for checking the flow rate of a water inlet valve comprises the following steps:

[0104] S1. The height of the highest flow column 5 is defined as h0, Δh is defined as 0.01·h0, and the height of the flow column 5 when compressed to the maximum degree is defined as h1;

[0105] S2, define h as h0-n·Δh, where n=0, 1, 2, ..., h gradually decreases until h is less than or equal to h1, and obtain several values ​​of h;

[0106] S3. Calculate the pressure p of the water inlet valve corresponding to each h value (i) ,

[0107] S4. Calculate and simulate to derive the constant resistance coefficient ζ of the porous plate 9 on the central channel 2 c and the variable resistance coefficient ζ existing in the water gap 8 on the flow seat 4 g ;

[0108] S5. Calculate the total resistance coefficient ζ,

[0109] S6. Calculate the flow rate Q of the water inlet valve corresponding to each h value i ,

[0110] S7. Output p(i) and Qi.

[0111] Preferably, the calculation and verification method for checking the flow rate of the water inlet valve further comprises: S8, converting the p obtained in step S4 into (i) As the horizontal axis, Qi obtained in step S7 is used as the vertical axis to obtain a water inlet valve performance test curve, and the performance test curve expresses the relationship between the input pressure and the output flow of the water inlet valve.

[0112] Preferably, the resistance coefficient of the water inlet valve can be calculated using the following model:

[0113] The constant resistance coefficient ζ of the porous plate 9 on the central channel 2 c is constant and can be defined based on simple experiments and / or numerical simulations of detailed geometries;

[0114] For the variable resistance coefficient ζ existing in the water gap 8 on the flow seat 4 g , we must first obtain the variable resistance range h∈[0,max(h ri )] The width of the water gap 8 is g =ζ g (h) is obtained through experimental measurement and / or detailed mathematical simulation calculations;

[0115] As a first approximation, the following method can be used. A simple geometric numerical simulation (axisymmetric configuration without flow column 5) is completed and the relationship is defined: g =f0(h), and then a correction factor ψ is introduced to match the geometric gap.

[0116] A device for calculating and verifying the flow rate of a water inlet valve comprises an input end, an output end, one or more processors, a storage device and one or more programs, wherein the one or more programs are stored in the storage device and are configured to be executed by one or more processors, and the program comprises a method for executing the verification of the water inlet valve.

[0117] The model in the present invention is an analysis system and calculation method of flow and pressure characteristics based on the combination of variable and constant factors of the water inlet valve. The variable is represented by the height of different flow columns 5 of the flow seat 4 under different pressures and the water flow area between the rubber sheets 7, the purpose of which is to analyze and grasp the flow change value under different pressure ranges.

[0118] The model of the present invention can be applied on a computer or independently. The geometric dimensions of the flow seat 4 and the rubber sheet 7 are defined by the structure, fluid performance and rubber deformation of the water inlet valve of the present invention, and the flow value range under different pressures is measured. The present invention can also be used to check the function of the water inlet valve test data.

Claims

1. A calculation and verification method for checking the flow of a water inlet valve, applied to a water inlet valve, the water inlet valve comprising a valve body (1), a central channel (2) being provided in the middle of the valve body (1), a flow control device (3) being provided outside the central channel (2), the flow control device (3) comprising a flow seat (4), a plurality of flow columns (5) being provided on the flow seat (4), the flow columns (5) being made of elastic material; a water flow area (6) being provided between the flow seat (4) and the central channel (2); the valve body (1) being covered with a rubber sheet (7), a hollow water flow gap (8) being formed between two adjacent flow columns (5), the flow seat (4) and the rubber sheet (7), the water flow gap (8) being communicated with the water flow area (6); The calculation and verification method for checking the flow rate of the water inlet valve is characterized in that: The following steps are involved: S1. The height of the highest flow column (5) is defined as h0, Δh is defined as x·h0, and the height of the flow column (5) when compressed to the maximum degree is defined as h1; S2, defining h as h0-n·Δh, where n=0, 1, 2, ..., h gradually decreases until h is less than or equal to h1, and obtaining a plurality of values ​​of h; providing a nonlinear curve strain characteristic of the rubber sheet deformation variable through a plurality of height dimensions of the flow column (5); S3. Calculate the pressure p(i) that the water inlet valve bears for each h value. Among them, S r is the cross-sectional area of ​​the flow column, E is the elastic modulus of the rubber under specific deformation conditions, h ri is the height of the i-th flow column, l0 is the initial thickness of the rubber sheet, S g It is the surface part of the flow seat exposed to the flow on the water gap side; S4, calculating and simulating to derive the constant resistance coefficient ζc of the porous plate (9) on the central channel (2) and the variable resistance coefficient ζg of the water gap (8) on the flow seat (4); S5. Calculate the total resistance coefficient ζ, S6. Calculate the flow rate Qi of the water inlet valve corresponding to each h value. S7. Output p(i) and Qi.

2. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: The flow column (5) is divided into a plurality of flow column (5) groups symmetrically arranged along the central axis, each flow column (5) group having a different height, and the water inlet valve can control the flow rate by means of the different height dimensions of the flow column (5).

3. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 2, characterized in that: Each group of flow columns (5) comprises four flow columns (5), with the midpoint of the central channel (2) as the center, and the four flow columns (5) are symmetrical in pairs to avoid the rubber sheet (7) from being skewed.

4. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: The flow column (5) is made of rubber.

5. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: A porous plate (9) is provided in the central channel (2).

6. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: It also includes S8, using p(i) obtained in step S4 as the horizontal axis and Qi obtained in step S7 as the vertical axis to obtain a water inlet valve performance test curve, wherein the performance test curve expresses the relationship between the input pressure and output flow of the water inlet valve.

7. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: The resistance coefficient of the water inlet valve can be calculated using the following model: The constant resistance coefficient ζc of the porous plate (9) on the central channel (2) is constant and can be defined based on simple experiments and / or numerical simulations of detailed geometric shapes; For the variable resistance coefficient ζg of the water gap (8) on the flow seat (4), it is necessary to first obtain a curve of the dependence of the variable resistance on the width of the water gap (8) ζg=ζg(h) within the range h∈[0,max(hri)], and then obtain it through experimental measurement or / and detailed mathematical simulation calculation.

8. A calculation and verification method for checking the flow rate of a water inlet valve according to claim 1, characterized in that: The basic assumptions of the model are also included: a. The fluid is incompressible; b. The liquid enters the water inlet valve from the water inlet cavity on one side of the rubber sheet (7) and flows out from the water outlet cavity on the other side of the water inlet valve. The water inlet cavity pressure P1 and the water outlet cavity pressure P2 are constant by default. The water outlet cavity pressure P2=0. The water inlet cavity pressure is set to P1=P, where P is the input pressure of the fluid; c. The flow pattern of the water inlet chamber and the water outlet chamber is stable; d. Assume that the average pressure of the flow seat (4) below the water gap (8) is equal to the external pressure of zero; e. The elastic force on each group of flow columns (5) of the same height is proportional to the deformation of the rubber sheet (7) after the flow columns (5) and the rubber sheet (7) come into contact; the total elastic force of the rubber sheet (7) is the sum of the elastic forces of each group of flow columns (5).

9. A device for calculating and verifying the flow rate of a water inlet valve, characterized in that: The invention comprises an input end, an output end, one or more processors, a storage and one or more programs, wherein the one or more programs are stored in the storage and are configured to be executed by one or more processors, and the programs include a method for executing the calibration method of the water inlet valve as described in any one of claim 1, claim 6, claim 7 or claim 8.

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