A gas proportional valve

Abstract

This utility model discloses a gas proportional valve, including a valve body, a valve core rotatably installed inside the valve body with an arc-shaped gas passage between its side and bottom, an intake pipe connected to the side of the valve body and fitted with the inlet end of the gas passage, an exhaust pipe connected to the bottom of the valve body and fitted with the outlet end of the gas passage, a connecting shaft located on top of the valve core, and a control component that drives the valve core to rotate via the connecting shaft to adjust the overlap between the inlet end of the gas passage and the intake pipe. The valve core is configured as a frustum structure with an upper bottom diameter larger than the lower bottom diameter. The valve body has an inclined surface matching the valve core, and the valve core contacts the inclined surface of the inner wall of the valve body. This utility model controls the overlap between the inlet end of the gas passage and the intake pipe by driving the valve core to rotate via a motor, thereby controlling the gas flow rate. The valve core of this utility model contacts the inclined surface of the inner wall of the valve body under its own gravity, which helps to improve the overall sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of stove technology, and in particular relates to a gas proportional valve. Background Technology

[0002] Gas valves, also known as gas safety protection devices, are mainly used in integrated cooktops; simply put, they are the on / off valves of household gas stoves. By opening or closing the valve, the gas supply can be controlled at any time. For example, closing the valve when the gas equipment is under maintenance or not in use for an extended period can prevent gas leaks. Some valves can adjust the gas flow rate as needed to meet the gas requirements of different gas appliances (such as gas stoves, gas water heaters, gas steam ovens, and all other gas-powered kitchen appliances).

[0003] However, most existing technologies regulate gas flow by using springs mounted on valves. Due to the non-linear characteristics of springs, the angle of valve rotation or other adjustments are not linearly related to the gas flow rate when the valve is turned or adjusted in other ways. For example, in the initial compression phase of the spring, a large angle needs to be rotated to increase the gas flow rate by a standard amount, while after the spring is compressed to a certain length, only a small angle needs to be rotated to increase the gas flow rate by a standard amount. This makes it difficult to precisely control the gas flow rate in actual use. Furthermore, as the usage time increases, the elastic deformation capacity of the spring gradually decreases, further increasing the difficulty of accurately controlling the gas flow rate. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a gas proportional valve that can control the gas flow rate and has strong sealing performance.

[0005] Technical solution: This utility model discloses a gas proportional valve, including a valve body, a valve core rotatably installed inside the valve body and having an arc-shaped gas passage between its side and bottom, an air inlet pipe installed and communicating with the side of the valve body and cooperating with the inlet end of the gas passage, an exhaust pipe installed and communicating with the bottom of the valve body and cooperating with the outlet end of the gas passage, a connecting shaft set on the top of the valve core, and a control component that drives the valve core to rotate through the connecting shaft to adjust the overlap between the inlet end of the gas passage and the air inlet pipe; the valve core is configured as a frustum structure with an upper bottom surface diameter larger than the lower bottom surface diameter, and the valve body has an inclined surface matching the valve core, and the valve core contacts the inclined surface of the inner wall of the valve body.

[0006] Furthermore, the control component includes a motor disposed above the valve core, a splined shaft fixedly connected to the output shaft of the motor and matched with the connecting shaft, and a splined groove matching the splined shaft is provided on the top of the connecting shaft.

[0007] The control assembly also includes a magnet fixedly connected to the connecting shaft, a circuit board disposed between the valve core and the motor, and two Hall sensors symmetrically mounted on the circuit board and cooperating with the magnet to control the rotation angle of the motor.

[0008] Furthermore, the circuit board is equipped with a plug for connecting to external circuitry.

[0009] Furthermore, it also includes a first support plate fixedly installed on the top of the valve body, a first support column fixedly installed between the first support plate and the circuit board, a second support column fixedly installed on the top of the circuit board, and a second support plate fixedly connected to the top of the second support column, wherein the motor is fixedly installed on the second support plate.

[0010] Furthermore, the top of the valve body is provided with a through groove to accommodate the valve core, and the first support plate is provided with a protrusion facing the valve core at the position opposite to the through groove. A spring is installed on the outer periphery of the protrusion, the bottom of the spring abuts against the valve core, and the spring is arranged around the outer periphery of the connecting shaft.

[0011] Furthermore, a first sealing ring is installed at the position opposite to the protrusion on the top of the first support plate, and the first sealing ring is sleeved on the outer periphery of the connecting shaft.

[0012] Furthermore, annular grooves are provided on the end faces of the first support plate and the valve body that are in contact with each other, and a second sealing ring is installed in the annular grooves.

[0013] Furthermore, a housing is fixedly installed on the outer periphery of the first support plate, and the motor, the second support plate, and the circuit board are all located inside the housing.

[0014] Beneficial Effects: Compared with the prior art, this utility model has the following advantages: This utility model controls the overlap between the gas passage inlet end and the air intake pipe by driving the valve core to rotate via a motor, thereby controlling the gas flow rate; the cooperation of the magnet and Hall sensor can accurately acquire and control the rotation angle of the valve core, which is beneficial to improving the accuracy of gas flow control. The valve core of this utility model contacts the inclined inner wall of the valve body under its own gravity, which is beneficial to improving the overall sealing performance; the cooperation of the spring, connecting shaft, and spline shaft ensures that the valve core is always in close contact with the inner wall of the valve body under the action of the spring, which can further improve the overall sealing performance and prevent gas leakage; the setting of the first sealing ring and the second sealing ring can also further enhance the overall sealing performance. The valve core of this utility model is designed as a frustum structure, with a connecting pipe integrally formed at its top, and an arc-shaped gas passage opened between its side and bottom. The overall structure of the valve core is simple and has low processing precision, which is convenient for actual production and processing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model when the valve body and housing are removed;

[0017] Figure 3 This is a schematic diagram of the valve core structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the present invention;

[0019] Figure 5 This utility model Figure 4 Enlarged view of point A in the middle. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0021] This utility model discloses a gas proportional valve, such as Figure 1 As shown, it includes a valve body 1, a valve core 3, an intake pipe 4, an exhaust pipe 5, and a control assembly. The valve core 3 is rotatably mounted inside the valve body 1, as shown. Figure 2 As shown, the valve core 3 is configured as a frustum structure with an upper bottom diameter larger than the lower bottom diameter. The valve body 1 has an inclined surface matching the valve core 3, and the valve core 3 contacts the inclined surface of the inner wall of the valve body 1. That is, the valve body 1 has a frustum-shaped receiving cavity matching the valve core 3. The valve core 3 contacts the inclined surface of the inner wall of the valve body 1 under its own weight, which helps improve the overall sealing performance. Figure 2 and Figure 4 As shown, an arc-shaped gas passage 2 is provided between the side and bottom of the valve core 3. The inlet pipe 4 is installed and connected to the side of the valve body 1, and the inlet end of the inlet pipe 4 cooperates with the inlet end of the gas passage 2 to introduce gas. The exhaust pipe 5 is installed and connected to the bottom of the valve body 1, and the exhaust pipe 5 cooperates with the outlet end of the gas passage 2 to export gas. A connecting shaft 6 is provided on the top of the valve core 3, and the valve core 3 and the connecting shaft 6 are integrally formed. The control component and the connecting shaft 6 drive the valve core 3 to rotate, adjusting the overlap between the inlet end of the gas passage 2 and the inlet pipe 4, thereby controlling the gas flow rate. The higher the overlap, the higher the gas flow rate. When the overlap is zero, the gas proportional valve is in the closed state. The valve core 3 has a frustum structure, an integrally formed connecting shaft 6 on the top, and an arc-shaped gas passage 2 between the side and bottom. The overall structure of the valve core 3 is simple, its machining precision is low, and it is convenient for actual production and processing.

[0022] like Figure 2-4As shown, the control assembly includes a motor 7, a splined shaft 8, a magnet 9, a circuit board 10, and a Hall sensor 11. The splined shaft 8 is fixedly connected to the output shaft of the motor 7, and the top of the connecting shaft 6 has a spline groove that matches the splined shaft 8. The magnet 9 is fixedly connected to the connecting shaft 6. The circuit board 10 is located between the valve core 3 and the motor 7, and a plug 12 for connecting to external circuitry is installed on the circuit board 10. Two Hall sensors 11 are symmetrically mounted on the circuit board 10. Preferably, the included angle between the two Hall sensors 11 is 180°, and the Hall sensor 11 matches the magnet 9. Motor 7 drives spline shaft 8 to rotate, which in turn drives connecting shaft 6 to rotate. This, in turn, causes connecting shaft 6 to synchronously drive valve core 3 to rotate. The rotation of valve core 3 changes the connection area between the inlet end of gas passage 2 and intake pipe 6, thereby changing the gas flow rate. During the rotation of connecting shaft 6, magnet 9 rotates synchronously, causing relative displacement between magnet 9 and Hall sensor 11. The Hall sensor 11 experiences regular changes in the strength or direction of the magnetic field on magnet 9, and the change in Hall voltage reflects the position information of magnet 9. The combination of Hall sensor and magnet to obtain position information is a mature existing technology. In other words, through the cooperation of magnet 9 and Hall sensor 11, the rotation angle of motor 7 can be accurately obtained and controlled, thereby accurately obtaining and controlling the overlap between the inlet end of gas passage 2 and intake pipe 4, i.e., accurately controlling the gas flow rate.

[0023] like Figure 2 As shown, a first support plate 13 is fixedly installed on the top of the valve body 1. A first support column 14 is fixedly installed on the top of the first support plate 13. A circuit board 10 is fixedly installed on the first support column 14. A second support column 15 is fixedly installed on the top of the circuit board 10. A second support plate 16 is fixedly installed on the top of the second support column 15. A motor 7 is fixedly installed on the second support plate 16. The second support plate 16 has a through hole through which the output shaft of the motor 6 passes. Both the first support plate 13 and the circuit board 10 have through holes for the connecting shaft 6 to pass through. A housing 21 is fixedly installed on the outer periphery of the first support plate 13. The motor 7, the second support plate 16, and the circuit board 10 are all located inside the housing 21. The housing 21 is designed to protect the first support plate 13, the first support column 14, the second support column 15, the second support plate 16, the motor 7, and the circuit board 10 inside.

[0024] like Figure 4 and Figure 5As shown, the top of the valve body 1 has a through groove to accommodate the valve core 3, and the first support plate 13 has a protrusion 17 facing the valve core 3 at a position opposite to the through groove. A spring 18 is installed on the outer periphery of the protrusion 17, and the bottom of the spring 18 abuts against the valve core 3, but the bottom of the spring 18 is not connected to the valve core 3. The spring 18 is arranged around the outer periphery of the connecting shaft 6. The protrusion 17 serves to limit and guide the spring 18. The cooperation between the connecting shaft 6 and the spline groove allows the connecting shaft 6 and the spline shaft 8 to slide relative to each other. Under the force of the spring 18, the valve core 3 is always in contact with the inner wall slope of the valve body 1, which helps to improve the overall sealing performance. A first sealing ring 19 is installed at the position opposite to the protrusion 17 on the top of the first support plate 13, and the first sealing ring 19 is sleeved on the outer periphery of the connecting shaft 6; annular grooves are opened on the end faces of the first support plate 13 and the valve body 1 that are in contact, and a second sealing ring 20 is installed in the annular grooves. The setting of the first sealing ring 19 and the second sealing ring 20 can further improve the overall sealing performance and prevent gas leakage.

[0025] In actual use, the motor 7, circuit board 10, and Hall sensor 11 can be connected to an external controller. When the motor 7 is started, it drives the valve core 3 to rotate via the splined shaft 8 and connecting shaft 6. The rotation of the valve core 3 changes the connection area between the inlet end of the gas passage 2 and the intake pipe 6, thereby changing the gas flow rate. During the rotation of the connecting shaft 6, the magnet 9 rotates synchronously. The magnet 9 and the Hall sensor 11 are relatively displaced. The Hall sensor 11 changes regularly due to the magnetic field strength of the magnet 9. The change in Hall voltage reflects the position information of the magnet 9 and the rotation angle of the motor 7 and the valve core 3. In other words, through the cooperation of the motor 7, the magnet 9, and the Hall sensor 11, the rotation angle of the motor 7 can be accurately obtained and controlled, thereby accurately obtaining and controlling the overlap between the inlet end of the gas passage 2 and the intake pipe 4, i.e., accurately controlling the gas flow rate.

Claims

1. A gas proportional valve, characterized in that: The valve core (3) is rotatably installed inside the valve body (1) and has an arc-shaped gas passage (2) between its side and bottom. The valve core (3) is connected to the side of the valve body (1) and installed to cooperate with the inlet end of the gas passage (2). The valve core (4) is connected to the bottom of the valve body (1) and installed to cooperate with the outlet end of the gas passage (2). The valve core (3) is set on the top of the valve core (3). The valve core (3) is set to rotate by the connecting shaft (6) to adjust the overlap between the inlet end of the gas passage (2) and the inlet pipe (4). The valve core (3) is set to a frustum structure with the upper bottom surface diameter larger than the lower bottom surface diameter. The valve body (1) has an inclined surface that matches the valve core (3) inside, and the valve core (3) contacts the inclined surface of the inner wall of the valve body (1).

2. The gas proportional valve according to claim 1, characterized in that: The control component includes a motor (7) disposed above the valve core (3), a splined shaft (8) fixedly connected to the output shaft of the motor (7) and matched with the connecting shaft (6), and a splined groove matching the splined shaft (8) is provided on the top of the connecting shaft (6).

3. The gas proportional valve according to claim 1, characterized in that: The control assembly also includes a magnet (9) fixedly connected to the connecting shaft (6), a circuit board (10) disposed between the valve core (3) and the motor (7), and two Hall sensors (11) symmetrically mounted on the circuit board (10) and cooperating with the magnet (9) to control the rotation angle of the motor (7).

4. The gas proportional valve according to claim 3, characterized in that: The circuit board (10) is equipped with a plug (12) for connecting to external lines.

5. The gas proportional valve according to claim 3, characterized in that: It also includes a first support plate (13) fixedly installed on the top of the valve body (1), a first support column (14) fixedly installed on the first support plate (13) between the first support plate (13) and the circuit board (10), a second support column (15) fixedly installed on the top of the circuit board (10), and a second support plate (16) fixedly connected to the top of the second support column (15), wherein the motor (7) is fixedly installed on the second support plate (16).

6. The gas proportional valve according to claim 5, characterized in that: The valve body (1) has a through groove at the top to accommodate the valve core (3). The first support plate (13) has a protrusion (17) facing the valve core (3) at the position opposite to the through groove. A spring (18) is installed on the outer periphery of the protrusion (17). The bottom of the spring (18) abuts against the valve core (3), and the spring (18) is arranged around the outer periphery of the connecting shaft (6).

7. The gas proportional valve according to claim 6, characterized in that: A first sealing ring (19) is installed at the top of the first support plate (13) opposite to the protrusion (17), and the first sealing ring (19) is sleeved on the outer periphery of the connecting shaft (6).

8. The gas proportional valve according to claim 5, characterized in that: The end faces of the first support plate (13) and the valve body (1) that are in contact are provided with annular grooves, and a second sealing ring (20) is installed in the annular groove.

9. The gas proportional valve according to claim 5, characterized in that: A housing (21) is fixedly installed on the outer periphery of the first support plate (13), and the motor (7), the second support plate (16) and the circuit board (10) are all located inside the housing (21).

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