WO2021168785A1

WO2021168785A1 - Control method for valve, and valve

Info

Publication number: WO2021168785A1
Application number: PCT/CN2020/077165
Authority: WO
Inventors: 李瑞锋; 朱梓悦; 杲先超
Original assignee: 博世力士乐（常州）有限公司
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2021-09-02
Also published as: CN115103974A

Abstract

A control method for a valve, and a valve. The control method comprises: when a valve is opened, an actuator (2) receiving a first voltage; and when the valve is opened to a specific position, the actuator (2) receiving a second voltage, wherein the second voltage is lower than the first voltage. The control method for a valve and the valve have the advantages of a simple structure, easy manufacturing, and convenient installation, and can increase the reversing speed and reduce the operational power consumption of the valve while ensuring the operational reliability of the valve.

Description

Control method and valve for valve

Technical field

This application relates to the field of valve control. More specifically, the present application relates to a control method for a valve, which aims to improve the operation efficiency of the valve. The application also relates to a valve using the above-mentioned control method.

Background technique

It is known that existing valves are driven by actuators such as electric drives or motors. The actuator is activated and deactivated in response to the release signal. The release signal is usually provided as a step function or a voltage in the form of a square wave. During the operation of the actuator, a constant operating voltage will be delivered to the actuator, and the actuator will therefore output a substantially constant force.

However, in solenoid valves such as directional valves, the resistance that the actuator has to face during operation varies. For example, when the actuator just starts to actuate, the fluid in the solenoid valve will create more resistance. After the actuator has moved the components in the solenoid valve to the desired position, the resistance faced by the actuator will be significantly different from the resistance at the beginning of the actuation. For example, the resistance of the fluid can be significantly smaller, and it is even possible that the resistance of the fluid is in the opposite direction. It can be seen that the existing control method produces a waste of energy.

Therefore, there is a continuing need for new control methods and valve solutions for valves. It is expected that the new solution can reduce energy consumption and improve operation efficiency while ensuring the reliability of actuation.

Summary of the invention

An object of the present application is to provide a control method for a valve, which uses a variable output voltage to control the valve. Another object of the present application is to provide a valve adopting the above-mentioned control method.

The purpose of this application is achieved through the following technical solutions:

A control method for valves, including:

When the valve is opened, the actuator receives the first voltage;

When the valve is opened in place, the actuator receives the second voltage; and

Wherein, the second voltage is lower than the first voltage.

The valve control method and valve of the present application have the advantages of simple structure, easy manufacture, convenient use, etc., which can increase the reversing speed and reduce the operating power consumption of the valve while ensuring the operating reliability of the valve.

Description of the drawings

The application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be used as a reference to the present application. Restrictions on the scope of application. In addition, unless otherwise specified, the drawings are only intended to conceptually represent the composition or configuration of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of the structure of a conventional valve.

Fig. 2 is a time-voltage coordinate diagram of a conventional valve control method.

Fig. 3 is a time-voltage coordinate diagram of an embodiment of the valve control method of the present application.

Detailed ways

Hereinafter, the preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present application.

First of all, it should be noted that the azimuth terms such as top, bottom, upward, downward, etc. mentioned in this article are defined relative to the directions in the respective drawings. These azimuth terms are relative concepts and vary according to the different positions and practical states of the components. Therefore, these directional terms should not be interpreted as restrictive.

In addition, it should also be pointed out that for any single technical feature described or implied in the embodiments or drawings herein, these technical features (or their equivalents) can still continue to be combined to obtain Other examples mentioned directly.

It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.

Fig. 1 is a schematic diagram of the structure of a conventional valve. Fig. 1 schematically shows the structure of a typical four-way solenoid valve. For the sake of clarity, some of the components in FIG. 1 are shown in dashed lines or in cross-sectional views. The illustrated solenoid valve may be, for example, a directional valve.

The solenoid valve includes a housing 1, one or two actuators 2, a valve core 3 and one or two springs 4. The actuator 2 is provided at both sides of the housing 1 and has a driving rod 5. The spring 4 is arranged between the valve core 3 and the drive rod 5. In the illustrated embodiment, both ends of the valve core 3 are provided with a spring 4, a driving rod 5 and an actuator 2, and the valve core 3 is movably arranged in a cavity inside the housing 1. The cavity is in communication with a number of ports. The illustrated embodiment shows ports P, A, B, TA, and TB. The cavity and each port may be filled with working fluid, and during operation, the cavity and the different ports may have different fluid pressures.

By selectively using one or two actuators 2 to drive the spool 3, the spool 3 can be positioned at different positions in the cavity. Different positions of the spool 3 can selectively make the ports P, TA, TB, A and B in fluid communication. For example, when the spool 3 is in the first position, the port P may be in fluid communication with the port A, while the port B may be in fluid communication with the port TB. When the spool 3 is in the second position, the port P can be in fluid communication with the port B, while the port A is in fluid communication with the port TA.

The actuator 2 functions as an actuator, and can be connected to an unshown controller and a power source through terminals shown in dashed lines. The controller can selectively control the power source to energize the actuator 2. When the actuator 2 is not energized, the valve core 3 will return to the initial position under the action of the springs 4 at both ends.

In addition, a tail pipe cap 6 may be attached to each of the actuators 2. Even when the actuator 2 is not energized, the tail pipe cap 6 can allow the user to manually operate the valve core 3.

Fig. 2 is a time-voltage coordinate diagram of a conventional valve control method. The abscissa in Figure 2 represents time, and the ordinate represents voltage intensity. Fig. 2 schematically shows the change in voltage of the release signal R1 over time. It is easy to understand that the voltage supplied to the actuator 2 also changes in voltage with time along with the release signal, and both the release signal R1 and the supplied voltage are constructed as a step function or a substantially constant square wave.

In the existing control method, the release signal R1 is configured as a step function or a square wave, and the power supply is configured to output a constant voltage U _B to the actuator 2 when the release signal R1 is received. Therefore, the actuator 2 will _{output a constant actuation force under the action of the constant voltage U B} , thereby pushing the spool 3 to move into position. When the release signal R1 disappears (not shown), the supplied voltage U _B will correspondingly decrease to zero.

However, during the above operation, the resistance generated by the working environment faced by the actuator 2 is inconsistent. For example, when the actuator 2 starts to actuate and the spool 3 starts to move, the working fluid may have a relatively large pressure, and when the spool 3 has moved to a desired position, the pressure of the working fluid may be relatively high. The small ones even have negative pressure. In addition, in the above-mentioned different positions, the spring 4 may have different compression or extension states, thereby generating different elastic forces.

The combination of the above-mentioned various forces causes the overall resistance faced by the actuator 2 to be inconsistent and variable during operation. The constant speed processing of the existing actuator 2 causes a loss of energy in this case, because the actuator 2 must first provide a significant driving force to make the spool 3 start to move, and the subsequent overall resistance will be significantly less than The overall resistance when the spool 3 starts to move.

Fig. 3 is a time-voltage coordinate diagram of an embodiment of the valve control method of the present application. The abscissa in Fig. 3 represents time, and the ordinate represents voltage intensity.

The present application provides a control method for a valve. Specifically, it includes: when the valve is opened, an actuator (in this embodiment, the actuator is the actuator 2) receiving a first voltage, ; When the valve is opened in place, the actuator receives a second voltage; and wherein the second voltage is lower than the first voltage.

Valve opening means that the valve starts to act according to a control command to make the spool move from the initial position to the target position. In this case, the movement of the valve core usually results in a change in the flow rate and flow direction of the fluid inside the valve. In one embodiment, opening the valve can cause the valve core to move from the initial position in the horizontally to the left or horizontally to the right direction in FIG. 1.

The valve open in place means that the spool has moved to the target position and the position of the spool no longer changes significantly. Therefore, the flow rate and flow direction of the fluid inside the valve will also be approximately stable, and no significant changes will occur.

The first voltage or the second voltage received by the actuator refers to the voltage used to drive the actuator, and the actuator will generate an actuation force under the action of the first voltage or the second voltage. The first voltage and the second voltage may be provided by a power source not shown, and the power source may be controlled by a controller not shown to selectively output the first voltage or the second voltage for the actuator to receive.

As shown in the figure, the first voltage can be provided in the form of a square wave. The first voltage can last for the first predetermined time t0 and has a higher voltage than the constant voltage U _{B of the related} art. The first voltage will last for a first predetermined time t0, and the first predetermined time t0 may be within 5 seconds, for example, may be between 1 second and 5 seconds. Those skilled in the art can set the length of the first predetermined time according to actual needs.

The second voltage may be a constant voltage or a voltage provided by a square wave with a predetermined duty cycle. In the illustrated embodiment, the second voltage is a square wave with an interval provided by a duty ratio between 0.1 and 0.75. For example, as shown in the figure, each square wave voltage may have a time length of t1, and each zero voltage may have a time length of t2.

In the illustrated embodiment, the second voltage is a voltage approximately equal to the _{constant voltage U B of the prior art.} However, according to actual needs, the second voltage can also be set higher or lower _{than the constant voltage U B in the prior art.}

Although not shown, the second voltage and the first voltage may also be provided in the form of other types of waves, including but not limited to sine waves, attenuated sine waves, sawtooth waves, pulse waves, triangle waves, rectangular waves, and the like.

The magnitude of the first voltage is selected so that the output of the actuator can overcome the first fluid resistance and spring force generated when the valve is activated. The magnitude of the second voltage is selected so that the output of the actuator can overcome the second fluid resistance and spring force generated during the operation of the valve. As described above, the second fluid resistance is generally less than the first fluid resistance.

Fig. 3 also shows the release signal R2 in the form of a dashed line. The supply of the first voltage starts according to the appearance of the release signal R2, and the supply of the second voltage ends according to the disappearance of the release signal R2. In the illustrated embodiment, the release signal R2 is shown as a single square wave. According to actual needs, the release signal R2 can also be configured to be provided in the form of other types of waves, including but not limited to sine waves, attenuated sine waves, sawtooth waves, pulse waves, triangle waves, rectangular waves, etc.

The voltage of the release signal R2 can also be configured according to actual needs, and can be higher, lower or equal to the constant voltage U _B.

The application also provides a valve which is operated by the above-mentioned control method.

By adopting the control method according to the present application, when the actuation is started, the first voltage applied to the actuator will provide a relatively larger actuation force, thereby helping to overcome various resistances to start the movement of the valve core 3. After the spool 3 moves to the desired position, the second voltage (or square wave as shown in the figure) applied to the actuator will ensure that there is sufficient actuation force to hold the spool 3 in place on the one hand, and on the other hand On the one hand, the actuation force will not be significantly greater than the various resistances that need to be overcome, thereby effectively saving electrical energy.

This specification discloses the application with reference to the accompanying drawings, and also enables those skilled in the art to implement the application, including manufacturing and using any device or system, selecting appropriate materials, and using any combined method. The scope of the application is defined by the claimed technical solution and includes other examples that those skilled in the art think of. As long as such other examples include structural elements that are not different from the literal language of the claimed technical solution, or such other examples include equivalent structural elements that are not substantially different from the literal language of the claimed technical solution, such other examples It should be considered to be within the scope of protection determined by the technical solution claimed in this application.

Claims

A control method for a valve is characterized in that it comprises:

When the valve is opened, the actuator (2) receives the first voltage;

When the valve is opened in place, the actuator (2) receives the second voltage; and

Wherein, the second voltage is lower than the first voltage.
The control method for a valve according to claim 1, wherein the first wave is provided in one form of a square wave, a sine wave, an attenuated sine wave, a sawtooth wave, a pulse wave, a triangle wave, and a rectangular wave. A voltage, the first voltage lasts for a first predetermined time (t0), and the first predetermined time (t0) is within 5 seconds.
The control method for a valve according to claim 1, wherein the first wave is provided in one form of a square wave, a sine wave, an attenuated sine wave, a sawtooth wave, a pulse wave, a triangle wave, and a rectangular wave. Two voltages.
The control method for a valve according to claim 3, wherein the second voltage is provided by a square wave having a duty ratio between 0.1 and 0.75.
The control method for a valve according to claim 1, characterized in that the magnitude of the first voltage is selected so that the output of the actuator (2) can overcome the first fluid resistance generated when the valve is activated and Spring force.
The control method for a valve according to claim 5, characterized in that the magnitude of the second voltage is selected so that the output of the actuator (2) can overcome the second fluid resistance generated during the operation of the valve And spring force, wherein the second fluid resistance is less than the first fluid resistance.
The control method for a valve according to claim 1, wherein the first voltage starts to be supplied according to the appearance of the release signal (R2).
The control method for a valve according to claim 7, characterized in that the supply of the second voltage is ended according to the disappearance of the release signal (R2).
The control method for a valve according to claim 7, characterized in that the release signal (R2) is applied in the form of a single square wave.
A valve, characterized in that the valve is operated by the control method for a valve according to any one of claims 1-9.