Automatic constant-pressure air speed control valve

Abstract

The utility model relates to the technical field of air duct valves, and particularly discloses an automatic constant-pressure air speed control valve which comprises a valve body, a valve shaft and a valve clack, and the valve shaft penetrates through the valve body. A worm and gear assembly is arranged at the upper end of the exterior of the valve body; a worm gear is coaxial with the top end of the valve shaft; the linear push rod motor is connected with the lower lock disc matching column through a spring. In addition, a wind pressure sensor and a pressure release valve are arranged at the top end and the bottom end of the air inlet side of the valve body respectively, and a mechanical wind speed sensor is arranged in the exhaust side. According to the device, the worm and gear assembly is combined with the valve shaft locking assembly, the valve shaft after the valve clack is adjusted is locked up and down, the stability of the valve shaft is improved, the mechanical air speed sensor is matched with the PLC, the exhaust air speed is kept at a constant value by automatically adjusting the opening degree of the valve clack, the air duct pressure is monitored through the air pressure sensor, and the air pressure is monitored through the PLC. The pressure relief value of the pressure relief valve is set, hydraulic pressure is increased when the air inlet pressure of the air pipe exceeds the set value, and the air pressure safety of the air duct is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of air duct valve technology, specifically to an automatic constant pressure air velocity control valve. Background Technology

[0002] In numerous fields such as industrial production, building ventilation, and energy transmission, the stable operation of duct systems is crucial. Traditional duct valves have significant shortcomings in controlling exhaust velocity and duct pressure. On the one hand, ordinary valves, after adjusting the valve disc, lack an effective fixing device for the valve shaft, making them prone to swaying under airflow impact. This causes the valve disc to shift position, making it impossible to accurately control the exhaust velocity. Consequently, the airflow velocity within the duct fluctuates significantly, affecting system stability and efficiency, and potentially damaging equipment. On the other hand, traditional valves struggle to achieve automatic constant control of exhaust velocity and safe monitoring of duct pressure. When duct pressure changes, they cannot adjust the valve opening degree in a timely manner, failing to guarantee a constant exhaust velocity. Furthermore, the lack of effective pressure monitoring and relief mechanisms means that when the duct inlet pressure exceeds the safe range, it cannot be relieved in time, easily leading to safety accidents and threatening personnel and equipment safety. Therefore, developing an automatic constant pressure and velocity control valve that improves valve shaft stability, automatically maintains constant exhaust velocity, and ensures duct pressure safety is of significant practical importance. Utility Model Content

[0003] In view of the above-mentioned technical problems in related technologies, this utility model provides an automatic constant pressure wind speed control valve, which can solve the above problems.

[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows:

[0005] An automatic constant pressure wind speed control valve includes a valve body, a valve shaft, and a valve disc. The valve shaft extends through the valve body from both the top and bottom. A worm gear assembly and a PLC controller are installed at the upper external end of the valve body. The worm gear assembly includes a worm motor, a bracket, a worm, and a worm wheel. The worm wheel is coaxially connected to the top of the valve shaft. A valve shaft locking assembly is installed at the lower external end of the valve body. The valve shaft locking assembly includes an upper locking plate, a lower locking plate, a lower locking plate mating post, a limiting groove, and a linear push rod motor. The top of the push rod of the linear push rod motor is connected to the bottom of the lower locking plate mating post via a spring. A limiting strip is integrally formed on the outside of the lower locking plate mating post. A limiting groove is formed on the inner wall of the limiting groove to nest with the limiting strip. The top of the upper locking plate is coaxially connected to the bottom of the valve shaft. A wind pressure sensor and a pressure relief valve are respectively installed at the top and bottom of the air inlet side of the valve body. A mechanical wind speed sensor is installed inside the air outlet side of the valve body.

[0006] Furthermore, the bottom of the upper locking disc is provided with several grooves, and the top of the lower locking disc is provided with several protrusions.

[0007] Furthermore, a protective cover A is fixed to the top of the valve body by screws. The surface of the protective cover A has heat dissipation grooves, and the worm gear assembly and PLC controller are both located inside the protective cover A.

[0008] Furthermore, a protective cover B is fixed to the bottom of the valve body by screws, and the valve shaft locking assembly is located inside the protective cover B.

[0009] Furthermore, the valve body has an integrally formed sealing ring that is fitted onto the outside of the valve disc.

[0010] The beneficial effects of this utility model are as follows: The worm gear assembly combined with the valve shaft locking assembly of this application locks the valve shaft after adjusting the valve disc, thereby improving the stability of the valve shaft. By using a mechanical wind speed sensor in conjunction with a PLC controller, the opening degree of the valve disc is automatically adjusted to maintain the exhaust wind speed at a constant value. The wind pressure sensor monitors the duct pressure and sets the pressure relief value of the pressure relief valve. When the air inlet pressure of the duct exceeds the set value, hydraulic pressure is applied to ensure the wind pressure safety of the duct. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] The present invention will now be described in further detail with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the external structure of an automatic constant pressure wind speed control valve;

[0014] Figure 2 This is a schematic diagram of the internal structure of an automatic constant pressure wind speed control valve;

[0015] Figure 3 This is a schematic diagram of the assembly of the worm gear assembly and the valve body;

[0016] Figure 4 This is a schematic diagram of the valve shaft locking assembly.

[0017] In the picture:

[0018] 1. Valve body; 101. Sealing ring; 2. Wind pressure sensor; 3. Pressure relief valve; 4. Protective cover B; 5. Protective cover A; 501. Heat dissipation groove; 6. Valve disc; 601. Valve shaft; 7. Mechanical wind speed sensor; 8. Worm gear assembly; 801. Worm gear; 802. Worm; 803. Worm motor; 9. Valve shaft locking assembly; 901. Upper locking plate; 902. Lower locking plate; 903. Lower locking plate mating column; 904. Limiting strip; 905. Limiting groove cylinder; 906. Limiting groove; 907. Linear push rod motor; 908. Spring; 10. PLC controller; 11. Groove; 12. Protrusion. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0020] like Figure 1-4 As shown, this utility model discloses an automatic constant pressure wind speed control valve, including a valve body 1, a valve shaft 601, and a valve disc 6. The valve shaft 601 extends through the valve body 1 from both the top and bottom. A worm gear assembly 8 and a PLC controller 10 are provided on the upper part of the valve body 1. The worm gear assembly 8 includes a worm motor 803, a bracket, a worm 802, and a worm wheel 801. The worm wheel 801 is coaxially connected to the top of the valve shaft 601. A valve shaft locking assembly 9 is provided on the lower part of the valve body 1. The valve shaft locking assembly 9 includes an upper locking plate 901, a lower locking plate 902, and a lower locking plate mating post 90. 3. Limiting groove cylinder 905 and linear push rod motor 907. The top of the push rod of the linear push rod motor 907 is connected to the bottom end of the lower locking plate mating column 903 through spring 908. The lower locking plate mating column 903 is integrally formed with a limiting strip 904. The inner wall of the limiting groove cylinder 905 is provided with a limiting groove 906 that nests with the limiting strip 904. The top of the upper locking plate 901 is coaxially connected to the bottom end of the valve shaft 601. The top and bottom ends of the air inlet side of the valve body 1 are respectively provided with a wind pressure sensor 2 and a pressure relief valve 3. The exhaust side of the valve body 1 is provided with a mechanical wind speed sensor 7.

[0021] Example 1: Pressure relief valve 3 is a mechanical pressure valve with a spring-diaphragm structure. Pressure pushes the diaphragm to compress the spring. When the pressure exceeds the spring's set value, the diaphragm drives the valve stem to open the valve to relieve pressure. When the air duct pressure returns to normal, the spring resets, and the diaphragm drives the valve stem to close the valve. Wind pressure sensor 2 uses a piezoresistive wind pressure sensor based on the piezoresistive effect of semiconductor materials—when the material is compressed, its crystal structure deforms, causing a change in resistivity. Mechanical wind speed sensor 7 uses a propeller-type core sensing element; the greater the wind speed, the faster the wind cup or propeller rotates. The rotating component converts its rotational speed into an electrical signal via a mechanical structure. The PLC controller receives and processes the signals from the wind pressure sensor 2 and the mechanical wind speed sensor 7, setting the wind speed operating program. When the valve disc 6 is perfectly parallel to the airflow direction, the normal wind speed in the duct is 4-6 m / s. When the wind speed exceeds 6 m / s, the worm motor 803 is controlled to rotate forward, causing the valve disc 6 to rotate at a reduced angle, thus decreasing the ventilation volume and lowering the wind speed. When the wind speed drops back to the 4-6 m / s threshold, the worm motor 803 stops. Before controlling the rotation of the worm motor 803, the linear actuator motor 90 must be controlled in advance. The retraction of push rod 7 causes the protrusion 12 of the lower locking plate 902 to separate from the groove 11 of the upper locking plate 901. When the worm motor 803 stops, the push rod of the linear push rod motor 907 is then extended and reset, causing the lower locking plate 902 and the upper locking plate 901 to press together. Due to the self-locking nature of the worm gear transmission, the top end of the valve shaft 601 can be restricted from rotation. Combined with the pressing of the lower locking plate 902 and the upper locking plate 901, the bottom end of the valve shaft 601 can also be restricted from rotation. Even if the protrusion 12 of the lower locking plate 902 and the groove 11 of the upper locking plate 901 are not completely aligned, the protrusion 12 and the groove 11 are designed to... With a large number of equal angles, when the valve shaft 601 rotates slightly, the protrusion 12 and the groove 11 can be pressed together by the rebound force of the spring 908. Since the limiting strip 904 of the lower locking plate mating column 903 can only slide vertically in the limiting groove 906, the lower locking plate mating column 903 cannot rotate. Thus, when the lower locking plate 902 and the upper locking plate 901 are pressed together, the lower end of the valve shaft 601 can be restricted from rotating. Combined with the irreversible worm gear transmission, the top end of the valve shaft 601 is restricted from rotating. After the valve disc is adjusted to open or close, the valve shaft 601 can be reinforced to ensure the stability of the valve disc position and maintain the wind speed.

[0022] In the preferred technical solution, the bottom of the upper locking plate 901 is provided with a number of grooves 11, and the top of the lower locking plate 902 is provided with a number of protrusions 12. The protrusions 12 and grooves 11 are numerous and set at equal angles, which facilitates the engagement and nesting of the protrusions 12 and grooves 11.

[0023] In the preferred technical solution, a protective cover A5 is fixed to the top of the valve body 1 by screws. The surface of the protective cover A5 is provided with heat dissipation grooves 501. The worm gear assembly 8 and the PLC controller 10 are both located inside the protective cover A5. The protective cover A5 is used to protect the worm gear assembly 8, and the heat dissipation grooves 501 are added for ventilation and heat dissipation.

[0024] In the preferred technical solution, a protective cover B4 is fixed to the bottom of the valve body 1 by screws. The valve shaft locking assembly 9 is located inside the protective cover B4. The linear push rod motor 907 is installed at the bottom of the limiting groove 905 through the bottom cover. The bottom of the limiting groove 905 is fastened to the protective cover B4 through the cover. The protective cover B4 is used to protect the valve shaft locking assembly 9.

[0025] In the preferred technical solution, the inner wall of the valve body 1 is integrally formed with a sealing ring 101 that is sleeved on the outside of the valve disc 6. The sealing ring 101 fits the outer circumference of the valve disc 6 to improve the sealing performance.

[0026] In practical use, the valve body 1 is connected to the air duct at both ends by bolts. The valve disc 6 is adjusted to the fully open position. The air pressure sensor 2 monitors the air pressure in the inlet duct in real time. If the pressure exceeds the limit value of the pressure relief valve 3, it automatically releases pressure. The mechanical wind speed sensor 7 monitors the wind speed in real time. The normal wind speed in the duct is 4~6 m / s. When the wind speed exceeds 6 m / s, the worm gear motor 803 is controlled to rotate forward, causing the valve disc 6 to rotate, reducing the ventilation volume and thus lowering the wind speed. When the wind speed drops back to within the 4~6 m / s threshold, the worm gear motor 803 stops. Before controlling the worm motor 803 to rotate, the push rod of the linear push rod motor 907 needs to be retracted in advance, so that the protrusion 12 of the lower locking plate 902 separates from the groove 11 of the upper locking plate 901. When the worm motor 803 stops, the push rod of the linear push rod motor 907 is then controlled to extend and reset, so that the lower locking plate 902 and the upper locking plate 901 are pressed together. Because the worm gear transmission has self-locking, the top end of the valve shaft 601 can be restricted from rotating. Combined with the pressing of the lower locking plate 902 and the upper locking plate 901, the bottom end of the valve shaft 601 can be restricted from rotating.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic constant pressure wind speed control valve, characterized in that, The valve includes a valve body (1), a valve shaft (601), and a valve disc (6). The valve shaft (601) extends through the valve body (1) from both the top and bottom. A worm gear assembly (8) and a PLC controller (10) are provided on the upper part of the valve body (1). The worm gear assembly (8) includes a worm motor (803), a bracket, a worm (802), and a worm wheel (801). The worm wheel (801) is coaxially connected to the top of the valve shaft (601). The valve body (1) is provided with a valve shaft locking assembly (9) at the lower external end. The valve shaft locking assembly (9) includes an upper locking plate (901), a lower locking plate (902), a lower locking plate mating column (903), a limiting groove cylinder (905), and a linear push rod motor (907). The top of the push rod of the linear push rod motor (907) is connected to the bottom end of the lower locking plate mating column (903) through a spring (908). The lower locking plate mating column (903) is integrally formed with a limiting strip (904). The inner wall of the limiting groove cylinder (905) is provided with a limiting groove (906) that is nested and mated with the limiting strip (904). The top of the upper locking plate (901) is coaxially connected to the bottom end of the valve shaft (601). The valve body (1) is provided with a wind pressure sensor (2) and a pressure relief valve (3) at the top and bottom of the air inlet side, respectively, and a mechanical wind speed sensor (7) is provided inside the air outlet side of the valve body (1).

2. The automatic constant pressure wind speed control valve according to claim 1, characterized in that, The bottom of the upper locking disc (901) is provided with several grooves (11), and the top of the lower locking disc (902) is provided with several protrusions (12).

3. The automatic constant pressure wind speed control valve according to claim 1, characterized in that, The valve body (1) is fixed with a protective cover A (5) by screws at the top of the exterior. The protective cover A (5) has a heat dissipation groove (501) on its surface. The worm gear assembly (8) and the PLC controller (10) are both located inside the protective cover A (5).

4. The automatic constant pressure wind speed control valve according to claim 1, characterized in that, The valve body (1) is fixed with a protective cover B (4) by screws at the bottom of the exterior, and the valve shaft locking assembly (9) is located inside the protective cover B (4).

5. An automatic constant pressure wind speed control valve according to claim 1, characterized in that, The valve body (1) has an integrally formed sealing ring (101) fitted onto the outside of the valve disc (6).

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