CN112610701A

CN112610701A - Electric check valve capable of controlling rotation angle, smoke exhaust system and control method

Info

Publication number: CN112610701A
Application number: CN202011440233.5A
Authority: CN
Inventors: 罗淦恩; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-04-06

Abstract

The invention discloses an electric check valve capable of controlling a rotation angle, a smoke exhaust system and a control method. The electric check valve is generally positioned in the smoke pipe, and the closing of the electric check valve plays a role in preventing the oil smoke in the public flue from flowing backwards, so that the accurate control of the rotation angle of the valve plate is of great importance; according to the invention, the code disc pulse number to be generated by the code disc assembly is firstly calculated according to the angle of the valve plate required to rotate, and then the code disc assembly works according to the code disc pulse number, so that the valve plate finishes the angle required to rotate, the whole process does not need the participation of a stepping motor, the cost is saved, and the large-scale popularization is easy.

Description

Electric check valve capable of controlling rotation angle, smoke exhaust system and control method

Technical Field

The invention belongs to the technical field of electric check valves, and particularly relates to an electric check valve with a controllable rotation angle, a smoke exhaust system and a control method.

Background

In the smoke exhaust collecting and discharging system, a main linkage structure of a terminal smoke exhaust machine and a host machine is an electric check valve, the electric check valve is controlled by the terminal smoke exhaust machine, and the rotation angle of a valve plate determines the flow cross-sectional area of a smoke pipe, so that the smoke exhaust amount from the terminal smoke exhaust machine to a public flue is controlled; when the terminal needs to be shut down, the electric check valve is closed to prevent the oil smoke in the public flue from flowing backwards; therefore, the rotation angle of the valve plate is controlled accurately, and the smoke discharge performance of the terminal machine is directly influenced.

The conventional control valve plate generally adopts a stepping motor, and although the stepping motor can accurately control the rotation angle by controlling the rotation steps, the cost of the stepping motor is high, and the stepping motor cannot be popularized in a large range.

Disclosure of Invention

In order to solve the problems, the invention provides an electric check valve capable of controlling a rotation angle, which solves the problem of high cost of the traditional technology.

Another object of the present invention is to provide a smoke evacuation system.

It is another object of the present invention to provide a method of controlling an electric check valve.

The technical scheme adopted by the invention is as follows:

the utility model provides a steerable turned angle's electric check valve, its includes shell, valve block, spacing subassembly and code wheel subassembly, valve block and spacing subassembly all are located inside the shell, just the valve block realizes opening and closing of electric check valve for the shell upset, spacing subassembly is used for carrying on spacingly to the angle of upset, code wheel subassembly and valve block are connected and are used for controlling the accurate rotation of valve block.

Preferably, the code wheel assembly comprises a motor, a rotating shaft, a code wheel body, a fixing piece, an infrared emission module and an infrared receiving module, one end of the rotating shaft is connected with the motor, the other end of the rotating shaft is connected with the valve plate, the code wheel body is vertically fixed on the rotating shaft, a plurality of hole sites are uniformly formed in the code wheel body, the fixing piece is of a concave structure, the edge of the code wheel body is located in a groove of the concave structure, gaps are reserved between the edge of the code wheel body and the two sides of the groove, and the infrared emission module and the infrared receiving module are respectively arranged on the two.

Preferably, the limiting component is an annular structure formed by extending towards the center along the inner ring of the shell.

Preferably, the diameter of the valve plate is larger than that of the inner ring of the limiting assembly.

Preferably, the electric check valve further comprises a controller for detecting a signal of the code wheel assembly.

A smoke exhaust system comprises the electric check valve, a smoke exhaust pipe, a common flue and a range hood, wherein the range hood is communicated with the common flue through the smoke exhaust pipe, and the electric check valve is arranged in the smoke exhaust pipe.

A control method of an electric check valve is applied to the electric check valve with the controllable rotation angle, and is implemented according to the following steps:

s1, resetting the valve plate, and calculating the number of coded disc pulses to be generated by the coded disc assembly according to the required rotation angle of the valve plate;

and S2, the code disc assembly works according to the code disc pulse number in the S1, so that the valve plate can complete the angle required to rotate.

Preferably, the specific method for resetting the valve plate in S1 is as follows:

the motor controls the valve plate to rotate along one direction, the controller detects signals of the code disc assembly, when the signals of the code disc assembly cannot be detected for a fixed duration, the valve plate is proved to be reset, and then the controller clears the recorded pulse number of the code disc assembly.

Preferably, in S1, the number of pulses of the encoder disc to be generated by the encoder disc assembly is calculated according to the angle that the valve plate needs to rotate, specifically, the calculation is performed according to the following formula:

C＝A/N

in the above formula, C is the number of coded disc pulses, a is the angle at which the valve plate needs to rotate, and N is the valve plate rotation angle corresponding to one coded disc pulse.

Preferably, the code wheel assembly in S2 works according to the code wheel pulse number in S1, so that the valve plate completes the angle required to rotate, specifically:

s21, the motor controls the valve plate to rotate along the other direction, the controller detects the period of the code disc assembly in real time, and the controller records the code disc pulse number C1 at the stage until the period is fixed;

s22, in the stage of S21, the period is fixed, the controller records the coded disc pulse number C2 in the stage, when C2 is C-2C1, the operation enters S23, and otherwise, the motor continues to work;

and S23, powering off the motor, and finishing the rotation angle of the valve plate after the inertia is finished.

Compared with the prior art, when the smoke exhaust valve is used, the electric check valve is generally positioned in the smoke pipe, and the electric check valve is closed to play a role in preventing the smoke in the public flue from flowing backwards, so that the rotation angle of the valve plate is controlled accurately; the invention realizes the accurate control of the rotating angle through the code disc assembly, and specifically comprises the following steps: the method comprises the steps of firstly calculating the code disc pulse number to be generated by the code disc assembly according to the angle of the valve plate needing to rotate, then enabling the code disc assembly to work according to the code disc pulse number, enabling the valve plate to complete the angle needing to rotate, avoiding the participation of a stepping motor in the whole process, saving the cost and being easy to popularize in a large range.

Drawings

Fig. 1 is a schematic structural diagram of an electric check valve capable of controlling a rotation angle according to embodiment 1 of the present invention;

fig. 2 is a cross-sectional view of an electric check valve capable of controlling a rotation angle according to embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a code wheel assembly in an electric check valve with controllable rotation angle provided by embodiment 1 of the invention;

FIG. 4 is a schematic structural diagram of a code wheel body in an electric check valve with controllable rotation angle provided in embodiment 1 of the present invention;

FIG. 5 is a diagram illustrating a code wheel period and a rotation angle of a valve plate in an electric check valve with controllable rotation angle according to embodiment 1 of the present invention;

fig. 6 is a flowchart of a control method of an electric check valve according to embodiment 3 of the present invention;

fig. 7 is a graph showing a relationship between a code wheel period and a motor operation time in a control method of an electric check valve according to embodiment 3 of the present invention;

fig. 8 is a graph showing the relationship between the motor rotation speed and the motor operation time in the control method of the electric check valve according to embodiment 3 of the present invention.

Wherein: 1. the infrared transmitting and receiving device comprises a shell, 2 valve plates, 3 limiting assemblies, 4 code disc assemblies, 41 motors, 42 rotating shafts, 43 code disc bodies, 44 fixing pieces, 45 infrared transmitting modules, 46 infrared receiving modules and 431 hole sites.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Embodiment 1 of the invention provides an electric check valve capable of controlling a rotation angle, as shown in fig. 1 and 2, the electric check valve comprises a shell 1, a valve plate 2, a limiting assembly 3 and a coded disc assembly 4, wherein the valve plate 2 and the limiting assembly 3 are both positioned in the shell 1, the valve plate 2 is turned over relative to the shell 1 to realize opening and closing of the electric check valve, the limiting assembly 3 is used for limiting the turning angle, and the coded disc assembly 4 is connected with the valve plate 2 and used for controlling the valve plate 2 to rotate accurately;

thus, by adopting the structure, the valve plate 2 is arranged in the shell 1, and the opening or closing of the electric check valve is realized through the rotation of the valve plate 2; the arrangement of the limiting component 3 limits the overturning angle of the valve plate 2, so that the valve plate is prevented from being overturned excessively;

importantly, in the process, the coded disc assembly 4 is used for realizing the precise control of the rotating angle, specifically: firstly, the code wheel pulse number to be generated by the code wheel assembly 4 is calculated according to the angle of the valve plate 2 needing to rotate, and then the code wheel assembly 4 works according to the code wheel pulse number to enable the valve plate 2 to complete the angle needing to rotate.

In a specific embodiment:

as shown in fig. 3 and 4, the code wheel assembly 4 includes a motor 41, a rotating shaft 42, a code wheel body 43, a fixing member 44, an infrared emission module 45 and an infrared reception module 46, one end of the rotating shaft 42 is connected with the motor 41, the other end of the rotating shaft is connected with the valve plate 2, the code wheel body 43 is vertically fixed on the rotating shaft 42, a plurality of hole sites 431 are uniformly formed on the code wheel body 43, the fixing member 44 is of a concave structure, the edge of the code wheel body 43 is located in a groove of the concave structure and has gaps with two sides of the groove, and the infrared emission module 45 and the infrared reception module 46 are respectively arranged on two sides of the groove;

thus, with the above structure, the motor 41 drives the rotating shaft 42 to rotate, and further drives the code wheel body 43 to rotate, when the code wheel body 43 rotates, the infrared emitting module 45 emits infrared rays, and the infrared receiving module 46 receives the infrared rays;

when the hole position 431 of the coded disc body 43 passes through the infrared transceiving position, the infrared transceiving is normal because no shielding exists, and the controller can detect a high level; when the hole sites 431 of the code wheel body 43 are not at the infrared transceiving position, the controller can detect a low level due to shielding and failure of infrared receiving, so that a pulse signal as shown in fig. 4 is formed, and because the hole sites 431 are uniformly arranged on the code wheel body 43, when the rotating shaft 42 simultaneously drives the code wheel body 43 and the valve plate 2 to rotate, the corresponding valve plate 2 rotates by a fixed angle (as shown in fig. 5) after the pulse signal of one period rotates by the code wheel body 43.

In one embodiment:

the limiting component 3 is an annular structure formed by extending towards the center along the inner ring of the shell 1;

specifically, the shell 1 is a cylindrical structure and is matched with the smoke exhaust pipe, and the limiting component 3 is a ring-shaped structure which is arranged along the inner surface of the shell and extends inwards.

The diameter of the valve plate 2 is larger than that of the inner ring of the limiting component 3;

therefore, in the rotating process of the valve plate 2, because the diameter of the valve plate 2 is larger than that of the inner ring of the limiting component 3, two sides of the valve plate 2 can be abutted against the limiting component 3 to play a limiting role; under the action of the limiting component 3, the maximum rotation angle of the valve plate 2 is 180 degrees.

The check valve also includes a controller for detecting signals from the code disc assembly 4.

The working principle of the embodiment is as follows:

firstly, determining that the valve plate 2 corresponding to the pulse signal of each period of rotation of the coded disc body 43 rotates by a fixed angle according to the infrared transmitting module 45 and the infrared receiving module 46; and then converting the angle of the valve plate 2 required to rotate into the pulse number, and after the pulse number is finished, correspondingly rotating the valve plate 2 by the corresponding angle.

In the embodiment, the simple coded disc assembly is used for replacing a traditional stepping motor to control the rotating angle of the valve plate, so that the valve plate rotating angle control device has the advantage of low cost; and when the motor in this embodiment needs to be replaced, the control of the rotation angle is not affected, and only the valve plate corresponding to the pulse signal of one period needs to be determined again to rotate by a fixed angle, so that the method has high universality.

Example 2

The embodiment 2 of the invention provides a smoke exhaust system, which comprises the electric check valve, a smoke exhaust pipe, a common flue and a smoke exhaust ventilator in the embodiment 1, wherein the smoke exhaust ventilator is communicated with the common flue through the smoke exhaust pipe, and the electric check valve is arranged in the smoke exhaust pipe;

in this embodiment, the electric check valve in embodiment 1 is applied to the smoke exhaust system, so that the smoke exhaust system does not increase the cost, and the flow cross-sectional area of the smoke pipe can be controlled.

Example 3

Embodiment 3 of the present invention provides a method for controlling an electric check valve, which applies the electric check valve capable of controlling a rotation angle described in embodiment 1, as shown in fig. 6, and is specifically implemented according to the following steps:

s1, resetting the valve plate 2, and simultaneously calculating the number of coded disc pulses to be generated by the coded disc assembly 4 according to the required rotation angle of the valve plate 2;

and S2, the coded disc assembly 4 works according to the coded disc pulse number in the S1, so that the valve plate 2 completes the angle required to rotate.

The specific method for resetting the valve plate 2 in the S1 comprises the following steps:

the motor 41 controls the valve plate 2 to rotate along one direction, the controller detects signals of the code disc assembly 4 at the same time, when the signals of the code disc assembly 4 cannot be detected for a fixed duration, the reset of the valve plate 2 is proved to be completed, and then the controller clears the recorded pulse number of the code disc assembly 4.

In S1, the number of code wheel pulses to be generated by the code wheel assembly 4 is calculated according to the angle at which the valve plate 2 needs to rotate, specifically, the calculation is performed according to the following formula:

C＝A/N

in the above formula, C is the number of coded disc pulses, a is the angle at which the valve plate 2 needs to rotate, and N is the valve plate rotation angle corresponding to one coded disc pulse.

In a specific embodiment:

the coded disc assembly 4 in the S2 works according to the coded disc pulse number in the S1, so that the valve plate 2 finishes the angle needing to rotate, and the method specifically comprises the following steps:

s21, controlling the valve plate 2 to rotate along the other direction by the motor 41, detecting the period of the code disc assembly 4 in real time by the controller, and recording the code disc pulse number C1 at the stage by the controller until the period is fixed;

s22, in the stage of S21, the period is fixed, the controller records the coded disc pulse number C2 in the stage, when C2 is C-2C1, S23 is carried out, otherwise, the motor 41 continues to work;

and S23, the motor 41 is powered off, and the valve plate 2 finishes the angle required to rotate after the inertia is finished.

The significance of this is that the motor 41 is divided into the following three phases from start to finish, as shown in fig. 7 and 8:

start-up phase (0-t 1): i.e. said S21, in this phase, the rotation speed of the motor 41 is slowly accelerated from the stationary state, and the detected code wheel signal should be: the code wheel period T (namely the pulse period) is smaller and smaller (because the speed is faster and faster, the time width of the code wheel pulse is narrower and narrower);

uniform speed stage (t1-t 2): that is, in the stage S22, after the motor 41 accelerates to a certain time T1, the rotation speed reaches a balance to rotate at a constant speed, and the code wheel period T is kept unchanged in this stage;

braking phase (t2-t 3): namely, in the stage S23, when the controller detects that the number of the code wheel pulses reaches the target number (namely C), the power supply of the motor is controlled to be cut off, the braking stage is started, the inertia of the system is attenuated until the motor is stopped from the power supply cut off, and the inertia can keep the angle of the motor continuing to rotate in the stage to be reflected on the number of the code wheel pulses detected by the controller in the stage.

C3 coded disc pulses are generated in the braking stage, C1 coded disc pulses are generated in the starting stage, and the effects of system inertia are the same in the starting stage and the braking stage, so that C1 is equal to C3;

for the above reasons, in S22, the number of dial pulses C2 in the constant speed stage should satisfy: c2 ═ C-2C 1.

In addition, when the set target rotation angle of the valve plate 2 is too small in the starting stage (i.e., S21) and the code wheel period is not detected to reach the uniform state, when it is detected that the valve plate 2 starts to rotate after being reset and the code wheel pulse number reaches C1 and the valve plate does not enter the uniform speed stage, the motor power supply can be controlled to be cut off to enter the braking stage, so that the motor stops after C1 code wheel periods, at this time, C1 is a/N/2, so that a/N/2+ a/N/2 is a/N code wheel pulses in total, and the valve plate 2 is just stopped at the angular position which needs to rotate.

In the embodiment, the code wheel pulse is determined at the starting stage of the motor every time to determine the code wheel pulse number required at the braking stage, if the motor is just changed, only the inertia effect of the system is changed, and the rotation angle of the valve plate corresponding to one code wheel pulse is still fixed and unchanged, so that the valve plate can be self-adapted to the inertia of the system by rotating the valve plate every time for different motors, the influence of motor difference is eliminated, and the generalization degree of the method is greatly improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a steerable turned angle's electric check valve, its characterized in that, it includes shell (1), valve block (2), spacing subassembly (3) and code wheel subassembly (4), valve block (2) and spacing subassembly (3) all are located inside shell (1), just valve block (2) realize opening and closing of electric check valve for shell (1) upset, spacing subassembly (3) are used for carrying on spacingly to the angle of upset, code wheel subassembly (4) and valve block (2) are connected and are used for controlling valve block (2) accurate rotation.

2. The electric check valve with the controllable rotation angle according to claim 1, wherein the coded disc assembly (4) comprises a motor (41), a rotating shaft (42), a coded disc body (43), a fixing member (44), an infrared emission module (45) and an infrared receiving module (46), one end of the rotating shaft (42) is connected with the motor (41), the other end of the rotating shaft is connected with the valve plate (2), the coded disc body (43) is vertically fixed on the rotating shaft (42), a plurality of hole sites (431) are uniformly formed in the coded disc body (43), the fixing member (44) is of a concave structure, the edge of the coded disc body (43) is located in a groove of the concave structure, gaps are reserved between the edge of the coded disc body and two sides of the groove, and the infrared emission module (45) and the infrared receiving module (46) are respectively arranged on two sides of the groove.

3. A rotary angle controllable electric check valve according to claim 2, characterized in that the limiting member (3) is an annular structure extending along the inner circumference of the housing (1) toward the center.

4. A rotary angle controllable electric check valve according to claim 3, characterized in that the diameter of the valve plate (2) is larger than the diameter of the inner ring of the position limiting component (3).

5. A rotary angle controllable electric check valve according to any of claims 1-4, characterized in that it further comprises a controller for detecting the signal from the code wheel assembly (4).

6. A smoke exhaust system, which is characterized by comprising an electric check valve, a smoke exhaust pipe, a common flue and a smoke exhaust ventilator as claimed in any one of claims 1 to 5, wherein the smoke exhaust ventilator is communicated with the common flue through the smoke exhaust pipe, and the electric check valve is arranged in the smoke exhaust pipe.

7. A method for controlling an electric check valve, which is characterized by applying the electric check valve with controllable rotation angle as claimed in any one of claims 1-5, and is implemented by the following steps:

s1, resetting the valve plate (2), and simultaneously calculating the code disc pulse number to be generated by the code disc assembly (4) according to the angle of the valve plate (2) needing to rotate;

and S2, the coded disc assembly (4) works according to the coded disc pulse number in the S1, so that the valve plate (2) can complete the angle required to rotate.

8. The control method of the electric check valve according to claim 7, wherein the specific method for resetting the valve sheet (2) in the S1 is as follows:

the motor (41) controls the valve plate (2) to rotate along one direction, the controller detects signals of the code disc assembly (4), when the signals of the code disc assembly (4) cannot be detected for a fixed duration, the reset of the valve plate (2) is proved to be completed, and then the controller clears the recorded pulse number of the code disc assembly (4).

9. The control method of an electric check valve according to claim 8, wherein the number of code wheel pulses to be generated by the code wheel assembly (4) is calculated according to the required rotation angle of the valve plate (2) in S1, specifically, according to the following formula:

C＝A/N

in the above formula, C is the number of coded disc pulses, A is the angle of rotation of the valve plate (2), and N is the valve plate rotation angle corresponding to one coded disc pulse.

10. The control method of the electric check valve as claimed in claim 9, wherein the code wheel assembly (4) in S2 is operated by the code wheel pulse number in S1 to make the valve plate (2) complete the required rotation angle, specifically:

s21, the motor (41) controls the valve plate (2) to rotate along the other direction, the controller detects the period of the code disc assembly (4) in real time, and the controller records the code disc pulse number C1 at the period until the period is fixed;

s22, in the stage of S21, the period is fixed, the controller records the coded disc pulse number C2 in the stage, when C2 is C-2C1, the operation is started to S23, and otherwise, the motor (41) continues to work;

and S23, the motor (41) is powered off, and the valve plate (2) finishes the angle required to rotate after inertia is finished.