CN114370522A - Flow rate adjustment valve and control method thereof - Google Patents

Abstract

A flow regulating valve and its control method, the control method of the flow regulating valve is suitable for controlling a flow regulating valve; the control method of the flow rate regulation valve includes the following steps; a driving motor for transmitting a first voltage to the flow regulating valve, so that the driving motor drives a nut piece of the flow regulating valve to rotate relative to a screw piece of the flow regulating valve to eliminate a tooth gap between the nut piece and the screw piece; and delivering a second voltage greater than the first voltage to a drive motor of the flow regulating valve, so that the drive motor drives a nut piece of the flow regulating valve to rotate relative to a screw piece of the flow regulating valve along the same direction, and drives the screw piece to move relative to the nut piece along the axial direction.

Description

Flow regulating valve and control method thereof

technical field

The invention relates to a flow regulating valve and a control method thereof, in particular to a flow regulating valve and a control method thereof for improving control accuracy.

Background technique

General water heaters can be divided into electric heating water heaters and water heaters heated by fuel gas. The fuel gas heating water heater uses the heat energy generated by the combustion of the fuel gas to increase the temperature of the hot water. Therefore, the control and structure of the air intake method determine the heating and rising process of the hot water and the heating efficiency. After the traditional water heater heats cold water, the user adjusts the hot and cold water source to achieve a suitable hot water temperature. At present, many water heater designs on the market provide a constant temperature control function to keep the hot water temperature constant.

The conventional water heater thermostat mainly uses a temperature control circuit to directly control the flow regulating valve to control the gas flow. However, the conventional one is complicated in overall structural design, and there are manufacturing tolerances among various parts, so that the flow regulating valve often produces "invalid steps" during control. For example, the user wants to control the stepper motor to take 100 steps, but because of the invalid step condition, the stepper motor actually only takes 90 steps, which leads to the disadvantage of inaccurate air intake.

SUMMARY OF THE INVENTION

The present invention provides a flow regulating valve and a control method thereof, so as to improve the control accuracy of the flow regulating valve.

The technical problem to be solved by the present invention is achieved through the following technical solutions:

The control method of a flow regulating valve disclosed in an embodiment of the present invention is suitable for controlling a flow regulating valve. The control method of the flow regulating valve includes the following steps. A first voltage is supplied to a driving motor of the flow regulating valve, so that the driving motor drives a nut member of the flow regulating valve to rotate relative to a screw member of the flow regulating valve to eliminate the backlash between the nut member and the screw member. A second voltage greater than the first voltage is supplied to the drive motor of the flow regulating valve, so that the driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the same direction and drives the screw member to be opposite along its axial direction. The nut piece moves.

Another embodiment of the present invention discloses a flow regulating valve comprising a casing, a nut member, a screw member, a valve plug and a reset member. The nut member is rotatably located within the housing. The screw element includes a connected thread segment and a combined segment. The threaded section is screwed to the nut member. The combined segment is located outside the shell. The valve plug includes a flexible body and a plug body. The flexible body is installed on the combination section of the screw member. The plug body is fixed on the side of the flexible body away from the screw member. The reset piece is located outside the housing, one end of the reset piece abuts against the housing, and the other end of the reset piece abuts against the flexible body of the valve plug.

In other words, the present invention provides a method for controlling a flow regulating valve, suitable for controlling a flow regulating valve, comprising:

A first voltage is supplied to a driving motor of the flow regulating valve, so that the driving motor drives a nut member of the flow regulating valve to rotate relative to a screw member of the flow regulating valve to eliminate the nut member and the screw member the backlash; and

A second voltage greater than the first voltage is supplied to the driving motor of the flow regulating valve, so that the driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the same direction to rotate. The screw member is driven to move relative to the nut member along its axial direction.

Preferably, after the step of delivering the second voltage to the driving motor of the flow regulating valve, further comprising:

The drive motor that supplies power to the flow regulating valve is stopped to release the control of the nut member by the drive motor.

Preferably, after the step of stopping power supply to the driving motor of the flow regulating valve, it further comprises:

A reset member of the flow regulating valve drives the screw member of the flow regulating valve to reset relative to the nut member along its axial direction, so as to make a valve plug on the screw member close a valve.

Preferably, when the driving motor is at the first voltage, the thrust force of the nut member to displace the screw member along the axial direction of the screw member is smaller than the resistance of the reset member.

Preferably, when the driving motor is under the second voltage, the thrust force of the nut member to displace the screw member along the axial direction of the screw member is greater than the resistance of the reset member.

The present invention also provides a flow regulating valve, comprising:

a shell;

a nut member rotatably located in the housing;

a screw member, comprising a connected thread segment and a combination segment, the thread segment is screwed to the nut member, and the combination segment is located outside the housing;

a valve plug, comprising a flexible body and a plug body, the flexible body is mounted on the assembly section of the screw member, and the plug body is fixed on a side of the flexible body away from the screw member;

A reset piece is located outside the casing, one end of the reset piece abuts against the housing, and the other end of the reset piece abuts against the flexible body of the valve plug.

Preferably, the reset member is a compression spring.

Preferably, the flow regulating valve further includes a magnetic member fixed to the nut member and used for cooperating with a coil to form a driving motor.

According to the flow regulating valve and the control method thereof of the above-mentioned embodiments, a first voltage (such as 2-3 volts) is firstly supplied to the coil (not shown in the figure) of the driving motor (such as a stepping motor) of the flow regulating valve, so as to The driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the direction to eliminate the backlash between the nut member and the screw member. Then send a second voltage (such as 24 volts) greater than the first voltage to the driving motor of the flow regulating valve, so that the driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the same direction to drive the screw The piece moves in the direction relative to the nut piece. In this way, the invalid steps of the flow adjustment valve can be eliminated before each control of the flow adjustment valve, thereby improving the control accuracy of the flow adjustment valve, such as reducing the original 10-step error to 2-3 steps.

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention, and provide further explanation for the protection scope of the present invention.

Description of drawings

FIG. 1 is a three-dimensional schematic diagram of the flow regulating valve according to the first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the flow regulating valve of FIG. 1;

Fig. 3 is the partial enlarged schematic diagram of Fig. 2;

4 to 9 illustrate a control method of the fluid regulating valve of FIG. 1 .

[Description of reference numerals]

10...Flow regulating valve

20...Pedestal

30...plate

32...Valve

100...shell

110...Housing parts

111... Bottom plate

112...Circular side plate

120...The first assembly seat

130...Second assembly seat

140...Elastomer

200...nut parts

210...Guide groove

211...First side

212...Second side

250...Bearing

300...Screw parts

310...Threaded segment

311...guide block

3111...First side

3121...Second side

320...Combination segment

350...Magnetic

400... valve plug

410...Flexible body

420...plug body

500...Reset pieces

a1, a2, b, c... directions

G1～G3...gap

Detailed ways

See Figures 1 through 3. FIG. 1 is a schematic perspective view of a flow regulating valve according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the flow rate adjustment valve of FIG. 1 . FIG. 3 is a partial enlarged schematic view of FIG. 2 .

The flow regulating valve 10 of this embodiment is fixed on a base 20 and is used for plugging the valve 32 of a plate 30 or opening the valve 32 of the plate 30 .

The flow regulating valve 10 includes a housing 100 , a nut member 200 , a screw member 300 , a valve plug 400 and a reset member 500 .

The casing 100 includes, for example, a shell member 110 , a first assembly seat 120 , a second assembly seat 130 and an elastic member 140 . The shell member 110 includes a bottom plate 111 and an annular side plate 112 . The annular side plate 112 is connected to the periphery of the bottom plate 111 , so that the bottom plate 111 and the annular side plate 112 together surround the accommodating space and the opening corresponding to the accommodating space. The first assembly seat 120 is installed at the opening of the casing member 110 , and the second assembly base 130 is movably located in the accommodating space of the casing member 110 . The elastic member 140 is sandwiched between the bottom plate 111 of the housing member 110 and the second assembly seat 130 .

The nut member 200 is rotatably located in the casing member 110 and is respectively mounted on the first assembly seat 120 and the second assembly seat 130 through two bearings 250 to reduce the rotational resistance of the nut member 200 relative to the casing member 110 .

The screw member 300 includes a thread segment 310 and a combined segment 320 which are connected together. The threaded section 310 is screwed to the nut member 200 . The assembly section 320 is located outside the housing member 110 . The nut member 200 is fixed with a magnetic member 350. The magnetic member 350, such as a permanent magnet, is matched with a coil (not shown in the figure) to form a driving motor, such as a stepping motor. When the magnetic member 350 is excited by the coil (not shown in the figure), the magnetic member 350 will drive the nut member 200 to rotate relative to the shell member 110 of the casing 100 in the same direction or in the opposite direction along the direction a1, and then pass the nut member 200 The screw member 300 is driven to translate relative to the shell member 110 of the housing 100 in the same direction or in the opposite direction along the direction b.

The valve plug 400 includes a flexible body 410 and a plug body 420 . The flexible body 410 is made of rubber, for example, and is mounted on the assembly section 320 of the screw member 300 . The plug body 420 is made of metal, for example, and is fixed to the side of the flexible body 410 away from the screw member 300 .

The restoring member 500 is, for example, a compression spring. The reset piece 500 is located outside the accommodating space of the housing 100 , one end of the reset piece 500 abuts against the housing 100 , and the other end of the reset piece 500 abuts against the flexible body 410 of the valve plug 400 . When the coil corresponding to the magnetic element 350 is powered off, the magnetic element 350 is no longer affected by the excitation and can rotate relative to the casing 100 by itself. At this time, the screw member 300 can be driven to reset along the direction c by the elasticity of the reset member 500 .

As shown in FIG. 3 , the nut member 200 has a thread-like guide groove 210 . The guide groove 210 has a first side surface 211 relatively close to the valve plug 400 and a second side surface 212 relatively far from the valve plug 400 . The thread segment 310 of the screw member 300 has a thread-like guide block 311 . The guide block 311 has a first side surface 3111 relatively close to the valve plug 400 and a second side surface 3121 relatively far from the valve plug 400 . When the valve plug 400 is under the elastic force of the reset member 500 , the first side 3111 of the guide block 311 of the screw member 300 will abut against the first side 211 of the guide groove 210 to eliminate the first side 3111 of the guide block 311 and the guide groove The gap between the first side surfaces 211 of the 210 . However, the second side surface 3112 of the guide block 311 of the screw member 300 is separated from the second side surface 212 of the guide groove 210 to generate a gap G1.

Next, the control method of the flow rate adjustment valve 10 is demonstrated. See Figures 4 to 9. 4 to 9 illustrate a control method of the fluid regulating valve of FIG. 1 . The control method of the flow regulating valve 10 is suitable for controlling a flow regulating valve 10, and the steps and procedures are divided into the following two types.

The first is the initial state. As shown in FIGS. 2 and 3 , the flow regulating valve 10 is in a state with no invalid steps, and there is no gap between the first side surface 3111 of the guide block 311 and the first side surface 211 of the guide groove 210 . As shown in FIG. 4 and FIG. 5 , a voltage sufficient to drive the screw member 300 to move in the direction b is supplied to the coil (not shown) of the driving motor (eg, stepping motor) of the flow regulating valve 10 , so that the driving motor drives the The nut member 200 of the flow regulating valve 10 rotates relative to the screw member 300 of the flow regulating valve 10 to drive the screw member 300 to move relative to the nut member 200 along its axial direction (eg, direction b). This voltage value is, for example, 24 volts (V).

Next, as shown in FIG. 6 and FIG. 7 , the coil of the driving motor (such as the stepping motor) of the flow regulating valve 10 is powered off, and the elastic force of the reset member 500 will drive the screw member 300 to reset in the direction c, and make the valve plug 400 closes the valve 32 of the plate 30 . When the valve plug 400 closes the valve 32 of the plate member 30, since the nut member 200 is in the state of inertial motion, it will continue to rotate relative to the screw member 300 in the direction a2, resulting in the contact between the first side 3111 of the guide block 311 and the guide groove 210. A gap G2 is formed between the first side surfaces 211 . In addition, a gap G3 is also generated between the flexible body 410 of the valve plug 400 and the combined section 320 of the screw member 300 . Gap G2 and Gap G3 are both causes of invalid steps.

Next, the second state is to be corrected. As shown in FIG. 6 and FIG. 7 , the flow regulating valve 10 is in a state where there is an invalid step, and there is a gap between the first side surface 3111 of the guide block 311 and the first side surface 211 of the guide groove 210 . G2, and a gap G3 between the flexible body 410 of the valve plug 400 and the combined section 320 of the screw member 300 .

As shown in FIG. 8 , a first voltage (such as 2-3 volts) is firstly supplied to the coil (not shown in the figure) of the driving motor (such as a stepping motor) of the flow regulating valve 10 , so that the driving motor drives the flow adjustment The nut member 200 of the valve 10 rotates relative to the screw member 300 of the flow regulating valve 10 along the direction a1 to eliminate the backlash between the nut member 200 and the screw member 300 .

Next, as shown in FIG. 9 , a second voltage (eg, 24 volts) greater than the first voltage is supplied to the driving motor of the flow regulating valve 10 , so that the driving motor drives the nut member 200 of the flow regulating valve 10 in the same direction a1 rotates relative to the screw member 300 of the flow regulating valve 10 to drive the screw member 300 to move relative to the nut member 200 in the direction b.

In this embodiment, the first voltage is, for example, 2-3 volts, but not limited thereto. In other embodiments, the first voltage can also be other voltage values, as long as the driving force of the nut member 200 to displace the screw member 300 along the axial direction of the screw member 300 is smaller than the resistance of the reset member 500 when the motor is driven at the first voltage That's it. In addition, in this embodiment, the second voltage is, for example, 24 volts, but not limited thereto. In other embodiments, the second voltage can also be other voltage values, as long as the driving force of the nut member 200 to displace the screw member 300 along the axial direction of the screw member 300 is greater than the resistance of the reset member 500 when the motor is driven at the second voltage .

According to the flow regulating valve and the control method thereof of the above-mentioned embodiments, a first voltage (such as 2-3 volts) is firstly supplied to the coil (not shown in the figure) of the driving motor (such as a stepping motor) of the flow regulating valve, so as to The driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the direction to eliminate the backlash between the nut member and the screw member. Then send a second voltage (such as 24 volts) greater than the first voltage to the driving motor of the flow regulating valve, so that the driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the same direction to drive the screw The piece moves in the direction relative to the nut piece. In this way, the invalid steps of the flow adjustment valve can be eliminated before each control of the flow adjustment valve, thereby improving the control accuracy of the flow adjustment valve, such as reducing the original 10-step error to 2-3 steps.

Claims (8)

1. A control method for a flow regulating valve, suitable for controlling a flow regulating valve, characterized in that, comprising: A first voltage is supplied to a driving motor of the flow regulating valve, so that the driving motor drives a nut member of the flow regulating valve to rotate relative to a screw member of the flow regulating valve to eliminate the nut member and the screw member the backlash; and A second voltage greater than the first voltage is supplied to the driving motor of the flow regulating valve, so that the driving motor drives the nut member of the flow regulating valve to rotate relative to the screw member of the flow regulating valve in the same direction to rotate. The screw member is driven to move relative to the nut member along its axial direction. 2 . The control method of the flow regulating valve as claimed in claim 1 , wherein after the step of delivering the second voltage to the driving motor of the flow regulating valve, the method further comprises: 2 . The drive motor that supplies power to the flow regulating valve is stopped to release the control of the nut member by the drive motor. 3 . The control method for a flow regulating valve as claimed in claim 2 , wherein after the step of stopping power supply to the driving motor of the flow regulating valve, the method further comprises: 3 . A reset member of the flow regulating valve drives the screw member of the flow regulating valve to reset relative to the nut member along its axial direction, so as to make a valve plug on the screw member close a valve. 4 . The control method of a flow regulating valve as claimed in claim 3 , wherein when the driving motor is at the first voltage, the thrust force of the nut member to displace the screw member along the axial direction of the screw member is less than 4 . The resistance of the reset piece. 5 . The control method of a flow regulating valve as claimed in claim 3 , wherein when the driving motor is at the second voltage, the thrust force of the nut member to displace the screw member along the axial direction of the screw member is greater than 5 . The resistance of the reset piece. 6. A flow regulating valve, characterized in that, comprising: a shell; a nut member rotatably located in the housing; a screw member, comprising a connected thread segment and a combination segment, the thread segment is screwed to the nut member, and the combination segment is located outside the housing; a valve plug, comprising a flexible body and a plug body, the flexible body is mounted on the assembly section of the screw member, and the plug body is fixed on a side of the flexible body away from the screw member; A reset piece is located outside the casing, one end of the reset piece abuts against the housing, and the other end of the reset piece abuts against the flexible body of the valve plug. 7 . The flow regulating valve of claim 6 , wherein the restoring member is a compression spring. 8 . 8 . The flow regulating valve of claim 6 , further comprising a magnetic member fixed to the nut member and used for cooperating with a coil to form a driving motor. 9 .

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