A cylinder type constant flow regulating valve

Abstract

The present invention discloses a cylinder-type constant flow regulating valve, comprising a valve body, a cylinder inside the front end of the valve body, a valve core built into the cylinder end, a piston and a connecting rod inside the cylinder, the piston being able to slide up and down in the cylinder, one end of the connecting rod being fixedly connected to the piston, and the other end of the connecting rod passing through the rear end of the cylinder and connected to a valve plate, which slides up and down with the piston. This valve adopts a combined mechanical structure, applies cylinder pressure to flow regulation, utilizes the fluid power exerted on the valve plate and the gas pressure in the cylinder to drive the valve plate to slide, adjusts the flow area, and realizes automatic adjustment of the air volume. The present invention has a simple structure, light weight, a wide adjustment range, high stability, and is maintenance-free.

Description

Technical Field

[0001] The present invention relates to an air volume regulating device, in particular to a cylinder type constant flow regulating valve, specifically a mechanical force self-operated constant flow regulating valve, belonging to the technical field of cement industry cooling machine equipment. Background Art

[0002] One of the hallmarks of the new generation of cement clinker coolers is the controlled air supply to each grate in the heat recovery area. Fluctuations in operating conditions and material movement during the production process can cause changes in the clinker thickness and particle size distribution on the grate bed. This leads to variations in the resistance of the material layer on the grate, and consequently, in the pressure drop across the grate. This in turn causes fluctuations in the total pressure drop across the channel. Furthermore, since the new generation of coolers utilizes a plenum air supply structure, with each plenum containing several grate units, without proper control measures, some units within the plenum will experience excessive cooling air flow while others will experience insufficient flow. Manual adjustment alone cannot achieve a reasonable air volume distribution.

[0003] In order to overcome the uneven air supply caused by different clinker layer thickness, temperature, particle size distribution, etc., a mechanical self-regulating valve is often installed under each grate plate to control the air supply flow of each grate plate.

[0004] Currently, there are two types of flow control valves for chillers: gravity-operated and spring-loaded. Gravity-operated flow control valves offer the advantages of maintenance-free operation and a long lifespan, but they often have a heavy counterweight, a narrow adjustment range, poor accuracy, and difficulty in installation. Spring-loaded flow control valves offer the advantages of reduced weight, a wide adjustment range, and ease of installation, but they can suffer from spring fatigue. With both types of flow control valves, the valve disc is subjected to fluid dynamics, causing inertia and reciprocating swings at the equilibrium point, resulting in unstable flow. Furthermore, flow control valves within the same air chamber can interfere with each other, affecting the flow control effectiveness. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a cylinder type constant flow regulating valve.

[0006] Technical solution: The cylinder-type constant flow regulating valve of the present invention includes a valve body, a cylinder is inside the upper end of the valve body, a valve core is built into the cylinder end, and a connecting rod is provided inside the cylinder. The piston can slide up and down in the cylinder, one end of the connecting rod is fixedly connected to the piston, and the other end of the connecting rod passes through the rear end of the cylinder and is connected to a valve plate, and the valve plate slides up and down with the piston.

[0007] Furthermore, the cylinder is fixed inside the valve body through supporting ribs.

[0008] Furthermore, the valve body is provided with a valve cylinder body, the cylinder and the valve plate are both placed in the valve cylinder body, and the valve plate slides up and down in the valve cylinder body along with the piston.

[0009] Furthermore, the valve cylinder is provided with a flow hole.

[0010] Furthermore, the valve body is provided with a normally open hole.

[0011] Furthermore, the number of the through-flow holes is more than one.

[0012] Furthermore, the diameter of the through hole is 3-6 mm.

[0013] Furthermore, the number of the normally open holes is more than one.

[0014] Furthermore, the cylinder is filled with high-pressure gas.

[0015] Furthermore, the valve plate and the valve cylinder are both circular.

[0016] Furthermore, the flow hole area is calculated based on the balance between the fluid power on the valve plate and the gas pressure in the cylinder, and the flow holes are arranged accordingly so that different flow areas can be obtained when the valve plate moves to different positions.

[0017] Furthermore, the flow area is calculated as follows:

[0018] According to the fluid mechanics equation, the relationship between the static pressure difference generated by the airflow passing through the valve plate and the airflow rate is calculated according to formula (1):

[0019]

[0020] Where ΔP x is the static pressure difference generated by the air flow passing through the valve body of the cylinder type constant flow control valve on the upper and lower valve plates, that is, the working pressure difference of the cylinder type constant flow control valve; ρ is the density of the air flow; μ is the flow coefficient of the flow hole, which is 0.6; Q is the air flow of the cylinder type constant flow control valve, A x It is the flow hole area of ​​the cylinder type constant flow control valve when the piston is at position X.

[0021] A large amount of temperature-stable airflow passes through the valve body of the cylinder-type constant flow control valve. The temperature change in the cylinder can be ignored. According to the ideal gas state equation (2):

[0022] P Gx ·L x ·S G =P G0 ·L0·S G (2)

[0023] Among them, P Gx is the pressure of the piston at position x in the cylinder, P G0 is the initial pressure of the cylinder, S G is the cross-sectional area of ​​the piston in the cylinder, L xis the distance between the piston in the cylinder and the upper end of the cylinder, and L0 is the length of the cylinder.

[0024] The valve plate is subjected to air flow pressure and cylinder pressure. When the forces are balanced, the equilibrium relationship of formula (3) exists:

[0025] ΔP x ·S F -G F =P Gx ·S G (3)

[0026] Where ΔP x is the static pressure difference between the upper and lower parts of the valve plate obtained in formula (1), S F G is the cross-sectional area of ​​the valve plate in the cylinder type constant flow control valve. F is the weight of the valve plate, P Gx is the pressure of the piston at position x in the cylinder, S G is the cross-sectional area of ​​the piston in the cylinder.

[0027] Substituting equations (2) and (3) into equation (1) yields the valve plate position L of the cylinder type constant flow control valve: x (i.e. the position of the cylinder piston) corresponds to the flow hole area A x The corresponding relationship is as shown in formula (4):

[0028]

[0029] The valve plate moves from position i to j, the distance L i -L j The corresponding flow area is ΔA ij According to formula (4), ΔA ij and valve plate position L i , L j The relationship is as shown in formula (5):

[0030]

[0031] Where ΔA ij For the cylinder type constant flow control valve valve plate from L i -L j The corresponding flow area.

[0032] Furthermore, the initial pressure P of the cylinder can be adjusted G0 , adjust the working pressure difference range of the cylinder type constant flow control valve, the calculation method is as follows:

[0033] Substituting formula (2) into formula (3) to obtain the working pressure difference range of the cylinder type constant flow control valve:

[0034]

[0035] Valve plate position L corresponding to the initial working pressure difference ΔP0 x =L0, maximum working pressure difference ΔP max Corresponding valve plate position L x =L min , L min It is the distance between the top dead center of the cylinder piston and the upper end of the cylinder, that is, the distance between the piston and the upper end of the cylinder when the distance between the valve plate and the lower end of the cylinder is zero. The working pressure difference range of the cylinder type constant flow regulating valve is ΔP0~ΔP max , Substitute into formula (6), ΔP0 is calculated according to formula (7), ΔP max Calculate according to formula (8):

[0036]

[0037] Among them, ΔP0 is the initial working pressure difference of the cylinder type constant flow control valve.

[0038]

[0039] Where ΔP max is the maximum working pressure difference of the cylinder type constant flow regulating valve, L min It is the distance between the top dead center and the end of the cylinder piston.

[0040] Furthermore, by increasing L X , to improve the control accuracy of the cylinder type constant flow control valve, the principle is as follows:

[0041] The valve plate displacement deviation ΔL caused by factors such as inertia and friction x , resulting in a deviation ΔA in the flow area x According to formula (4), the relationship between the actual flow area and the valve plate position is expressed as formula (9):

[0042]

[0043] Formula (9) is transformed into formula (10):

[0044]

[0045] Where, ΔL x is the deviation of the cylinder piston in the x position, ΔA x is the flow area deviation of the cylinder type constant flow control valve, displacement deviation ΔL x When a certain time is reached, by increasing L X , which can reduce the valve plate displacement deviation ΔL x influence, thereby improving the control accuracy of the constant flow control valve.

[0046] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0047] (1) The present invention adopts a cylinder-type constant flow regulating valve, which uses the cylinder pressure to regulate the flow, and uses the fluid power exerted on the valve plate and the gas pressure in the cylinder to adjust the flow area, thereby realizing automatic adjustment of the air volume.

[0048] (2) The present invention uses a cylinder piston to move more smoothly, the valve plate is less likely to swing back and forth, and the flow control is more stable.

[0049] (3) The present invention can improve the adjustment accuracy of the constant flow control valve by increasing the stroke of the piston in the cylinder.

[0050] (4) The present invention can increase the adjustment range of the constant flow control valve by increasing the initial pressure in the cylinder.

[0051] (5) The present invention conveniently changes the working range of the constant flow regulating valve by charging and discharging gas through the valve core.

[0052] (6) The present invention has a simple structure, light weight and is maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 Schematic diagram of the cylinder type constant flow regulating valve of the present invention;

[0054] Figure 2 This is a top view of the cylinder type constant flow regulating valve of the present invention;

[0055] Figure 3 This is a schematic diagram of the valve cylinder of the present invention. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0057] Example 1

[0058] like Figure 1-3 As shown in the figure, the cylinder-type constant flow control valve of the present invention comprises a valve body 1, a cylinder 2, and a valve plate 3. Cylinder 2 is secured to the interior of valve body 1 via support ribs 8. A valve core 5 is built into the front end of cylinder 2, allowing it to pass through valve body 1 and communicate with the outside world. A piston 6 is located within cylinder 2 and connected to valve plate 3 via a connecting rod 7 that passes through the rear end of cylinder 2. Piston 6 can slide up and down within cylinder 2.

[0059] The valve body 1 comprises a valve barrel 4, within which the cylinder 2 and valve plate 3 are housed. The sidewall of the valve barrel 4 is provided with at least one flow hole for ventilation of the cylinder-type constant flow control valve. The top of the valve body 1 is provided with at least one normally open hole 9 for ventilation. The cylinder 2 is filled with high-pressure gas, which is used to balance the fluid forces acting on the valve plate 3. The valve plate 3 is circular and can slide up and down within the valve barrel 4 along with the piston 6, allowing the valve plate 3 to move to different positions to obtain different flow areas.

[0060] The diameter of the flow hole in the valve cylinder 4 is 3-6mm, which acts as a throttle. The area of ​​the flow hole is calculated based on the balance between the fluid force on the valve plate 3 and the high-pressure gas pressure in the cylinder 2. Different flow areas are obtained by moving the valve plate 3 to different positions. The flow area calculation method is as follows:

[0061] like Figure 1 、 3 As shown, according to the fluid mechanics equation, the relationship between the static pressure difference generated by the airflow passing through the valve plate and the air flow rate is calculated according to formula (1):

[0062]

[0063] Where ΔP x is the static pressure difference generated by the air flow passing through the valve body of the cylinder type constant flow control valve on the upper and lower valve plates, that is, the working pressure difference of the cylinder type constant flow control valve; ρ is the density of the air flow; μ is the flow coefficient of the flow hole, which is 0.6; Q is the air flow of the cylinder type constant flow control valve, A x It is the flow hole area of ​​the cylinder type constant flow control valve when the piston is at position X.

[0064] A large amount of temperature-stable airflow passes through the valve body of the cylinder-type constant flow control valve. The temperature change in the cylinder can be ignored. According to the ideal gas state equation (2):

[0065] P Gx ·L x ·S G =P G0 ·L0·S G (2)

[0066] Among them, P Gx is the pressure of the piston at position x in the cylinder; P G0 is the initial pressure of the cylinder, S G is the cross-sectional area of ​​the piston in the cylinder, L x is the distance between the piston in the cylinder and the upper end of the cylinder, and L0 is the length of the cylinder.

[0067] The valve plate is subjected to air flow pressure and cylinder pressure. When the forces are balanced, the equilibrium relationship of formula (3) exists:

[0068] ΔP x ·S F -G F =P Gx ·S G (3)

[0069] Where ΔP x is the static pressure difference between the upper and lower parts of the valve plate obtained in formula (1), S FG is the cross-sectional area of ​​the valve plate in the cylinder type constant flow control valve. F is the weight of the valve plate, P Gx is the pressure of the piston at position x in the cylinder, S G is the cross-sectional area of ​​the piston in the cylinder.

[0070] Substituting equations (2) and (3) into equation (1) yields the valve plate position L of the cylinder type constant flow control valve: x (i.e. the position of the cylinder piston) corresponds to the flow hole area A x The corresponding relationship is as shown in formula (4):

[0071]

[0072] The valve plate moves from position i to j, the distance L i -L j The corresponding flow area is ΔA ij According to formula (4), ΔA ij and valve plate position L i , L j The relationship is as shown in formula (5):

[0073]

[0074] Where ΔA ij For the cylinder type constant flow control valve valve plate from L i -L j The corresponding flow area.

[0075] Furthermore, the initial pressure P of the cylinder can be adjusted G0 , adjust the working pressure difference range of the cylinder type constant flow control valve, the calculation method is as follows:

[0076] Substituting formula (2) into formula (3) to obtain the working pressure difference range of the cylinder type constant flow control valve:

[0077]

[0078] Valve plate position L corresponding to the initial working pressure difference ΔP0 X =L0, maximum working pressure difference ΔP max Corresponding valve plate position L x =L min , L min It is the distance between the top dead center of the cylinder piston and the upper end of the cylinder, that is, the distance between the piston and the upper end of the cylinder when the distance between the valve plate and the lower end of the cylinder is zero. The working pressure difference range of the cylinder type constant flow regulating valve is ΔP0~ΔP max , Substitute into formula (6), ΔP0 is calculated according to formula (7), ΔP max Calculate according to formula (8):

[0079]

[0080] Among them, ΔP0 is the initial working pressure difference of the cylinder type constant flow control valve.

[0081]

[0082] Where ΔP max is the maximum working pressure difference of the cylinder type constant flow regulating valve, L min It is the distance between the top dead center and the end of the cylinder piston.

[0083] Furthermore, by increasing L X , to improve the control accuracy of the cylinder type constant flow control valve, the principle is as follows:

[0084] The valve plate displacement deviation ΔL caused by factors such as inertia and friction x , resulting in a deviation ΔA in the flow area x According to formula (4), the relationship between the actual flow area and the valve plate position is expressed as formula (9):

[0085]

[0086] Formula (9) is transformed into formula (10):

[0087]

[0088] Where, ΔL x is the deviation of the cylinder piston in the x position, ΔA x is the flow area deviation of the cylinder type constant flow control valve, displacement deviation ΔL x When a certain time is reached, by increasing L x , which can reduce the valve plate displacement deviation ΔL x influence, thereby improving the control accuracy of the constant flow control valve.

[0089] When using:

[0090] The air flow enters from the flow hole of the valve cylinder 4 on the valve body 1 and flows out from the normally open hole 9, which will form a pressure difference between the inside and outside of the valve cylinder 4, acting on the valve plate 3. At the same time, the valve plate 3 is connected to the piston 6 in the cylinder 2 and is subjected to the gas pressure of the cylinder 2. Under the action of force balance, the valve plate 3 remains stable. When the wind speed of the flow hole increases, the pressure difference on the valve plate 3 increases, pushing the valve plate 3 upward, and the piston 6 in the cylinder 2 moves upward synchronously to compress the gas. The pressure in the cylinder increases, and the force on the valve plate 3 reaches a new balance. At the same time, the flow hole area of ​​the valve cylinder 4 above the valve plate 3 decreases, and the gas flow through the valve body 1 remains constant. Conversely, the flow hole wind speed decreases, the valve plate 3 moves downward, the flow area increases, and the gas flow through the valve body 1 remains constant.

Claims

1. A cylinder type constant flow regulating valve, comprising a valve body (1), characterized in that: A cylinder (2) is provided inside the front end of the valve body (1), a valve core (5) is built into the upper end of the cylinder (2), a piston (6) and a connecting rod (7) are provided inside the cylinder (2), the piston (6) can slide up and down in the cylinder (2), one end of the connecting rod (7) is fixedly connected to the piston (6), and the other end of the connecting rod (7) passes through the rear end of the cylinder (2) and is connected to the valve plate (3), and the valve plate (3) slides up and down with the piston (6); the cylinder (2) is fixed to the Inside the valve body (1), the valve body (1) is provided with a valve cylinder (4), the cylinder (2) and the valve plate (3) are both placed in the valve cylinder (4), the valve plate (3) slides up and down in the valve cylinder (4) along with the piston (6), the valve cylinder (4) is provided with a flow hole, and the valve body (1) is provided with a normally open hole (9), and the distribution of the flow hole is calculated according to the balance between the fluid power applied to the valve plate (3) and the gas pressure in the cylinder (2), so that different flow areas can be obtained when the valve plate (3) moves to different positions.

2. The cylinder type constant flow regulating valve according to claim 1, characterized in that: The number of the through-flow holes is one or more.

3. The cylinder type constant flow regulating valve according to claim 1, characterized in that: The diameter of the through-hole is 3-6 mm.

4. The cylinder type constant flow regulating valve according to claim 1, characterized in that: The number of the normally open holes (9) is more than one.

5. The cylinder type constant flow regulating valve according to claim 1, characterized in that: The cylinder (2) is filled with high-pressure gas.

6. The cylinder type constant flow regulating valve according to claim 1, characterized in that: The valve plate (3) and the valve cylinder (4) are both circular.

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