JP2019158129A - Valve device - Google Patents

Abstract

To provide a valve device that allows an opening to be adjusted accurately with a simple configuration.SOLUTION: A valve device 1 is equipped with: a valve casing 10; a valve body 20 housed in the valve casing 10 in a state of being rotatable around a central axis; and a valve seat 30 arranged in the valve casing 10 in a state of being in contact with the valve body 20. The valve device includes: an energizing member 50 for energizing the valve seat 30 to a valve body 20 side; a DC motor for rotating the valve body 20; a current detection part for detecting a value of a current flowing in a rotor of the DC motor; an encoder 921 for detecting a rotation speed of the DC motor; a motor control part for controlling operation of the DC motor; and an origin position determination part for detecting a predetermined rotation position where a predetermined change occurs in a fluid circulation state on the basis of a result of the detection by the current detection part or a result of the detection by the encoder when the DC motor is operated on a predetermined condition, and determining the predetermined rotation position as an origin position of the rotation operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve device.

  Conventionally, in a combustion apparatus such as a boiler, a flow rate adjusting valve is used to adjust the flow rate of fuel supplied to the combustion apparatus. As a flow rate adjustment valve applicable to the combustion device, for example, a needle type or a ball type is known, and the valve body is rotated by a driving mechanism such as a stepping motor. And the opening degree of a flow regulating valve is changed by changing the position of a valve body with a drive mechanism.

  When using a flow control valve in a combustion device, in order to accurately control the opening of the flow control valve operated by the drive mechanism, a predetermined position in the closed position of the valve body is set as the origin position, and combustion is started, etc. In addition, a technique for detecting the origin position has been proposed (see, for example, Patent Document 1). Thus, the origin position of the valve body can be confirmed at the start of combustion, and the origin position can be corrected as necessary. Therefore, a deviation between the operation position of the valve body operated by the drive mechanism and the actual position is prevented.

JP 2012-102839 A

  Conventionally, the origin position is detected by setting a predetermined position of the flow control valve as the origin position and providing a mechanism for detecting the set origin position. On the other hand, manufacturing errors occur in parts such as a valve body and a valve seat constituting the flow control valve. Therefore, when assembling the product, the origin position is accurately set for each flow control valve, and the mechanism for detecting the origin position is accurately attached to the flow control valve. Cost increases.

  Therefore, an object of this invention is to provide the valve apparatus which can adjust an opening degree correctly with a simple structure.

  The present invention relates to a valve casing; a valve body having a circular cross section perpendicular to the axis accommodated in the valve casing so as to be rotatable around a central axis; and disposed in the valve casing in contact with the valve body. A valve seat comprising: a biasing member that biases the valve seat toward the valve body; a DC motor that rotates the valve body; and a current value that flows through a rotor of the DC motor. A current detection unit to detect, an encoder to detect the rotational speed of the DC motor, a motor control unit to control the operation of the DC motor, and the current detection unit when the DC motor is operated under a predetermined condition. Based on the detection result or the detection result of the encoder, a predetermined rotational position where a predetermined change occurs in the fluid flow state is detected, and the predetermined rotational position is rotated. And determining the home position determining unit and the origin position of the operation relates to a valve device comprising a.

  The motor control unit operates the DC motor so that the rotation speed detected by the encoder is constant, and the origin position determination unit changes the current value detected by the current detection unit. Preferably, the predetermined rotational position is detected based on the above.

  The motor control unit operates the DC motor so that the current value detected by the current detection unit becomes constant, and the origin position determination unit changes the rotation speed detected by the encoder. Preferably, the predetermined rotational position is detected based on the above.

  The valve device includes a valve casing including a fluid inlet channel, a first fluid outlet channel, and a second fluid outlet channel, and an axis perpendicular to the valve casing that can be rotated about a central axis. A valve body having a circular cross section and having a body-side inlet hole that opens to the surface and extends along the central axis; and one or two that are open to the surface and continuously formed in the body-side inlet hole A valve body provided with a plurality of body-side outlet holes, and a valve seat disposed in the valve casing in contact with a side surface of the valve body, the valve seat being disposed on the first fluid outlet channel side, A first valve seat in which one outlet hole is formed; and a valve seat that is arranged on the second fluid outlet flow channel side and includes a second valve seat in which a seat side second outlet hole is formed, The body side outlet hole, the seat side first outlet hole, and the seat side second outlet hole are: (i) an opening of the body side outlet hole when the valve body is rotated forward around the central axis. Is in a non-communication state in which neither the seat-side first exit hole nor the seat-side second exit hole communicates; (ii) the opening of the body-side exit hole communicates only with the seat-side first exit hole; A communication state A in which the flow rate of the fluid discharged from the seat-side first outlet hole increases proportionally as the rotation angle of the valve body in the forward rotation direction changes; (iii) the body-side outlet hole Even if the opening communicates only with the seat-side first outlet hole and the rotation angle of the valve body in the forward rotation direction changes, the flow rate of the fluid discharged from the seat-side first outlet hole does not change. Communication state B; (iv) the body As the opening of the outlet hole communicates with both the seat side first outlet hole and the seat side second outlet hole, the seat side second outlet changes as the rotation angle of the valve body in the forward rotation direction changes. A communication state C in which the flow rate of the fluid discharged from the hole increases proportionally while the flow rate of the fluid discharged from the seat side first outlet hole does not change; and (v) the opening of the body side outlet hole However, even if the rotation angle of the valve body in the normal rotation direction is changed, the seat side first outlet hole and the seat are communicated with both the seat side first outlet hole and the seat side second outlet hole. The number of the body side outlet holes and the relative positional relationship and shape of each outlet hole are set so that the flow state is switched in the order of the communication state D in which the flow rate of the fluid discharged from the side second outlet hole does not change. The origin position determination unit A position where the non-communication state and the communication state A are switched, a position where the communication state A and the communication state B are switched, a position where the communication state B and the communication state C are switched, and a position where the communication state C and the communication state D are switched. Among these, it is preferable to detect any one or more as the predetermined rotational position.

  ADVANTAGE OF THE INVENTION According to this invention, the valve apparatus which can adjust an opening degree correctly with a simple structure can be provided.

It is a figure which shows the multiway valve as a valve apparatus which concerns on one Embodiment of this invention. It is a figure which shows the valve body in the multi-way valve of one Embodiment, (a) is a perspective view, (b) is a front view, (c) is a top view, (d) is seen from the body side 1st exit hole side. A side view is shown. It is a figure which shows the 1st valve seat in the multi-way valve of one Embodiment, (a) is the front view seen from the outer side, (b) is the elements on larger scale of (a), (c) is A- of (a). A line sectional view is shown. It is a figure which shows the 2nd valve seat in the multi-way valve of one Embodiment, (a) is the front view seen from the outer side, (b) is a side view, (c) is the elements on larger scale of (a), (d) Shows a cross-sectional view taken along line B-B in FIG. It is a figure explaining operation | movement of the multi-way valve of one Embodiment, (a) shows a non-communication state, (b) shows a 1st communication state, (c) shows a 2nd communication state.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, description will be made based on an example in which the valve device of the present invention is applied to the multi-way valve 1. The multi-way valve 1 is used, for example, in a combustion apparatus such as a boiler apparatus having a plurality of fuel injection nozzles when adjusting the supply of fuel to the plurality of fuel injection nozzles.
The multi-way valve 1 according to this embodiment will be described with reference to FIGS. FIG. 1 is a view showing a multi-way valve 1 of the present embodiment.

  The multi-way valve 1 of the present embodiment has one fluid inlet (fluid inlet channel 112) and two fluid outlets (first fluid outlet channel 131 and second fluid outlet channel 141), from the fluid inlet. Regulates the outflow of the inflowing fluid from the fluid outlet. The multi-way valve 1 detects the position of the valve casing 10, the valve body 20, the valve seat 30, the valve stem 40, the urging member 50, the drive mechanism 91 that rotates the valve body 20, and the valve body 20. A position detection unit 92.

The valve casing 10 is formed in a box shape having a hollow portion. The valve casing 10 includes a case main body 11 and a pair of side cases 13 and 14.
The case body 11 is formed in a T-shaped cross section in which both end portions are open and an opening is also formed in the central portion. An opening at the center of the case body 11 constitutes a fluid inlet channel 112.
The side case 13 closes the opening on one end side of the case body 11. A first fluid outlet channel 131 is formed in the side case 13. The side case 14 closes the opening on the other end side of the case body 11. A second fluid outlet channel 141 is formed in the side case 14.
The case body 11 and the pair of side cases 13 and 14 are assembled in a watertight manner via an O-ring or the like.
A stem insertion hole 111 in which the valve stem 40 is disposed is formed in the valve casing 10 (case body 11). The stem insertion hole 111 is formed coaxially with the fluid inlet channel 112. In the present embodiment, the stem insertion hole 111 is formed on the upper surface of the case main body 11, and the fluid inlet channel 112 is formed on the lower surface of the case main body 11.

The valve body 20 is formed in a shape having a circular cross section perpendicular to the axis. In the present embodiment, as shown in FIGS. 1 and 2, the valve body 20 is formed in a spherical shape and is accommodated in the valve casing 10. The valve body 20 is disposed inside the valve casing 10 so as to be rotatable with respect to the valve casing 10 about a central axis X that coincides with the central axis of the stem insertion hole 111.
The valve body 20 is formed with a body side inlet hole 21, a body side first outlet hole 221 and a body side second outlet hole 222 as body side outlet holes 22, and a stem connecting portion 23.
The body side inlet hole 21 opens at a position facing the fluid inlet channel 112 on the spherical surface of the valve body 20 and extends along the central axis X.

The body-side first outlet hole 221 opens in the spherical surface of the valve body 20, extends toward the center of the valve body 20, and continues to the body-side inlet hole 21. The body-side second outlet hole 222 opens in the spherical surface of the valve body 20, extends toward the center of the valve body 20, and continues to the body-side inlet hole 21.
The body-side first outlet hole 221 opens at a position communicating with the first fluid outlet channel 131 via a seat-side first outlet hole 311 described later at a set rotation angle when the valve body 20 is rotated. A part is formed (see FIG. 5). When the valve body 20 is rotated, the body-side second outlet hole 222 opens at a position that communicates with the second fluid outlet channel 141 via a seat-side second outlet hole 321 described later at a set rotation angle. A part is formed (see FIG. 5).

  In the present embodiment, two body side outlet holes 22 are formed, and the body side first outlet hole 221 and the body side second outlet hole 222 extend from the body side inlet hole 21 as shown in FIG. It extends at an angle of 90 degrees with respect to the direction (center axis X). Further, as shown in FIG. 2C, the body-side first outlet hole 221 and the body-side second outlet hole 222 extend such that the angle θ between them becomes an obtuse angle (for example, 160 degrees).

  The stem connecting portion 23 is formed at a position facing the stem insertion hole 111 on the spherical surface of the valve body 20. The stem connecting portion 24 is formed in a concave shape so that a part of the spherical surface of the valve body 20 is rectangular in a top view.

  The valve seat 30 is disposed inside the valve casing 10 in contact with the valve body 20. The inner surface of the valve seat 30 has a curved surface shape substantially corresponding to the spherical surface of the valve body 20, whereby the valve seat 30 supports the valve body 20 slidably. In the present embodiment, as shown in FIG. 1, the valve seat 30 includes a first valve seat 31 disposed on one side case 13 side and a second valve seat disposed on the other side case 14 side. 32. That is, in this embodiment, the valve body 20 is sandwiched and supported by the first valve seat 31 and the second valve seat 32.

A seat side first outlet hole 311 is formed in the first valve seat 31. The sheet-side first outlet hole 311 communicates with the first fluid outlet channel 131. As shown in FIGS. 3A and 3B, the sheet-side first outlet hole 311 includes a portion 311a having a small opening area and a portion 311b having a large opening area. The portion 311a having a small opening area is disposed on the side that first communicates with the body-side first outlet hole 221 when the valve body 20 is rotated in a normal rotation direction to be described later. After the side first outlet hole 221 communicates with the portion 311a having a small opening area, it is disposed on the side that communicates.
In the present embodiment, the curvature of the seat surface 312 around the seat-side first outlet hole 311 in the first valve seat 31 is set slightly smaller than the curvature of the spherical surface of the valve body 20.

A seat side second outlet hole 321 is formed in the second valve seat 32. The sheet-side second outlet hole 321 communicates with the second fluid outlet channel 141. As shown in FIGS. 4A and 4C, the sheet-side second outlet hole 321 includes a portion 321a having a small opening area, a portion 321b in which the opening area expands, a portion 321c having a large opening area, Is provided. The portion 321a having a small opening area is disposed on the side first communicating with the body-side second outlet hole 222 when the valve body 20 is rotated in the forward rotation direction. After the body side second outlet hole 222 communicates with the portion 321a having a small opening area, the body side second exit hole 222 is disposed on the side to be communicated with. And the part 321c with a large opening area is arrange | positioned in the side which communicates, after the body side 2nd exit hole 222 and the part 321b which an opening area expands communicate.
In the present embodiment, the curvature of the seat surface 322 around the seat-side second outlet hole 321 in the second valve seat 32 is set slightly smaller than the curvature of the spherical surface of the valve body 20.

  The valve stem 40 is formed in a cylindrical shape, and is connected to the valve body 20 in a state of being inserted into the stem insertion hole 111 of the case body 11. The valve stem 40 is disposed in the stem insertion hole 111 so as to be rotatable with respect to the valve casing 10 via a bearing 113 disposed in the stem insertion hole 111. The valve stem 40 rotates the valve body 20 about the central axis X of the valve stem 40 as a rotation center.

  The urging member 50 is disposed between the valve seat 30 and the side cases 13 and 14. In the present embodiment, the urging member 50 is disposed between the first valve seat 31 and the one side case 13 and between the second valve seat 32 and the other side case 14. The urging member 50 urges the valve seat 30 toward the valve body 20 to improve the adhesion (sealability) between the valve seat 30 and the valve body 20. The biasing member 50 is configured by, for example, a deformed wire spring.

  The drive mechanism 91 includes a DC motor 911 and a motor control unit 912. The DC motor 911 includes a rotor connected to an output shaft and a stator disposed around the rotor, and the output shaft is connected to the valve stem 40 via a speed reduction mechanism 93. The DC motor 911 is driven to rotate by receiving a direct current. When an instruction signal related to the rotation of the valve body 20 is input, the motor control unit 912 outputs a direct current to the DC motor 911 so as to rotate the valve body 20 at a rotation angle associated with the instruction signal. The motor control unit 912 determines the rotation angle of the valve body 20 based on the rotation amount of the DC motor 911 detected by an encoder 921 described later, and controls the operation of the DC motor 911. The DC motor 911 rotates the valve stem 40 to rotate the valve body 20 around the central axis X as a rotation center.

  The position detector 92 detects the position of the valve body 20. The position detection unit 92 includes an encoder 921, a current detection unit 922, and an origin position determination unit 923.

The encoder 921 detects information related to the rotation of the DC motor 911 (rotation amount, rotation direction, and rotation speed). The encoder 921 includes a rotating plate 921a and a light transmission detector 921b.
The rotating plate 921a is formed in a disk shape having a plurality of slits (not shown) arranged at predetermined intervals in the circumferential direction, and the plate surface is orthogonal to the rotating shaft (output shaft) of the DC motor 911. It is attached to the rotating shaft of the DC motor 911 so as to follow the direction of the rotation. Thereby, the rotating plate 921a rotates in synchronization with the rotation of the DC motor 911.

  The light transmission detecting unit 921b detects light transmission and light shielding by the rotating plate 921a. The light transmission detector 921b includes a light emitting element and a light receiving element. The light transmission detecting unit 921b is arranged such that the light emitting element and the light receiving element sandwich the rotating plate 921a.

  According to the encoder 921 described above, the rotating plate 921a rotates in synchronization with the rotation of the DC motor 911. The light transmission detecting unit 921b detects whether or not light is received from the light emitting element by the light receiving element as the rotating plate 921a rotates. Accordingly, the encoder 921 detects the number of slits passing between the light emitting element and the light receiving element per predetermined time by the light transmission detecting unit 921b, thereby determining the rotation direction, rotation angle, and rotation speed of the rotating plate 921a. It can be detected.

The current detection unit 922 detects the value of current flowing through the rotor of the DC motor 911.
Based on the detection result of the current detection unit 922 or the detection result of the encoder 921 when the DC motor 911 is operated under a predetermined condition, the origin position determination unit 923 changes the flow state of the fluid (fuel) flowing through the valve body 20. A predetermined rotation position where a predetermined change occurs is detected, and this predetermined rotation position is determined as the origin position of the rotation operation.
Details of the determination of the origin position by the origin position determination unit 923 will be described later.

Next, the operation of the multi-way valve 1 of the present embodiment will be described with reference to FIG. In the multi-way valve 1 of the present embodiment, the three communication states of (i) non-communication state, (ii) first communication state, and (iii) second communication state are switched in this order depending on the rotation angle of the valve body 20. As described above, the number of body side outlet holes 22 (two in the present embodiment), and the relative positional relationship and shape of the body side outlet hole 22, the seat side first outlet hole 311 and the seat side second outlet hole 321. Is set.
More specifically, the multi-way valve 1 starts the position where the valve body 20 is in a non-communication state, and rotates the valve body 20 in a predetermined direction about the central axis X as a rotation center. The communication state (that is, the fluid distribution state) is switched in the order of the state, (ii) the first communication state, and (iii) the second communication state. Hereinafter, the rotation direction on the side switched from the non-communication state to the first communication state and the second communication state is referred to as a normal rotation direction.

(I) Non-communication state As shown in FIG. 5A, the non-communication state is such that the opening of the body side outlet hole 22 (the body side first outlet hole 221 and the body side second outlet hole 222) is located on the seat side. The first outlet hole 311 and the sheet-side second outlet hole 321 are not in communication with each other. In the present embodiment, in the non-communication state, the opening of the body side first outlet hole 221 is closed by the first valve seat 31 and the valve casing 10. The opening of the body side second outlet hole 222 is closed by the second valve seat 32 and the valve casing 10. Thereby, the fluid flowing in from the fluid inlet channel 112 does not flow out of either the first fluid outlet channel 131 or the second fluid outlet channel 141. That is, the non-communication state corresponds to the closed position of the multi-way valve 1.

(Ii) First Communication State The first communication state is a state in which the opening of the body side outlet hole 22 communicates only with the seat side first outlet hole 311 as shown in FIG. In the present embodiment, in the first communication state, the opening of the body side first outlet hole 221 communicates with the seat side first outlet hole 311, and the opening of the body side second outlet hole 222 is the seat side second outlet hole. 321 does not communicate. Thereby, in the first communication state, the fluid flowing in from the fluid inlet channel 121 flows out only from the first fluid outlet channel 131. In the present embodiment, the first communication state includes (a) communication state A and (b) communication state B.

(A) Communication state A
In the communication state A, the opening of the body-side outlet hole 22 communicates only with the seat-side first outlet hole 311, and the seat-side first outlet hole 311 changes as the rotation angle of the valve body 20 in the forward rotation direction changes. The state of the range where the flow volume of the fluid discharged from is increased proportionally is shown.
In the present embodiment, in the range of the rotation angle of the valve body 20 in which the opening of the body side first outlet hole 221 communicates with the portion 311a (see FIG. 3) having a small opening area of the seat side first outlet hole 311. It will be in the communication state A.

(B) Communication state B
In the communication state B, the opening of the body-side outlet hole 22 communicates only with the seat-side first outlet hole 311, and even if the rotation angle of the valve body 20 in the forward rotation direction changes, the seat-side first outlet hole A state in which the flow rate of the fluid discharged from 311 does not change is shown.
In the present embodiment, the communication state B is established in the range of the rotation angle of the valve body 20 in which the opening of the body-side first outlet hole 221 communicates with the portion 311b having a large opening area of the seat-side first outlet hole 311. .

  Thus, in this embodiment, since the first communication state includes the communication state A, the flow rate of the fluid flowing out from the first fluid outlet channel 131 can be proportionally adjusted in the first communication state.

(Iii) Second communication state As shown in FIG. 5C, the second communication state is such that the opening of the body side outlet hole 22 includes both the seat side first outlet hole 311 and the seat side second outlet hole 321. It is in a state of communicating with. In the present embodiment, in the second communication state, the opening of the body-side first outlet hole 221 communicates with the seat-side first outlet hole 311 and the opening of the body-side second outlet hole 222 is the seat-side second outlet hole. 321 communicates. Thereby, in the second communication state, the fluid flowing in from the fluid inlet channel 121 flows out from both the first fluid outlet channel 131 and the second fluid outlet channel 141. In the present embodiment, the second communication state includes (c) communication state C and (d) communication state D.

(C) Communication state C
In the communication state C, the opening of the body side outlet hole 22 communicates with both the seat side first outlet hole 311 and the seat side second outlet hole 321, and the rotation angle of the valve body 20 in the forward rotation direction changes. Accordingly, the flow rate of the fluid discharged from the sheet side second outlet hole 321 increases proportionally, while the flow rate of the fluid discharged from the sheet side first outlet hole 311 does not change.
In this embodiment, the opening of the body side first outlet hole 221 communicates with the portion 311b having a large opening area of the seat side first outlet hole 311 and the opening of the body side second outlet hole 222 is the seat side first. The communication state C is established in the range of the rotation angle of the valve body 20 communicating with the portion 321a having a small opening area of the two outlet holes 321.

(D) Communication state D
In the communication state D, the opening of the body side outlet hole 22 communicates with both the seat side first outlet hole 311 and the seat side second outlet hole 321, and the rotation angle of the valve body 20 in the forward rotation direction changes. However, the flow rate of the fluid discharged from the sheet-side first outlet hole 311 and the sheet-side second outlet hole 321 does not change.
In this embodiment, the opening of the body side first outlet hole 221 communicates with the portion 311b having a large opening area of the seat side first outlet hole 311 and the opening of the body side second outlet hole 222 is the seat side first. In the range of the rotation angle of the valve body 20 communicating with the portion 321b where the opening area of the two outlet holes 321 increases or the portion 321c where the opening area is large, the communication state D is established.

  Thus, in this embodiment, since the second communication state includes the communication state C, the flow rate of the fluid flowing out from the second fluid outlet channel 141 in the second communication state can be adjusted proportionally.

Next, the determination of the origin position in the multi-way valve 1 of the present embodiment will be described.
In the present embodiment, the multi-way valve 1 is driven by a DC motor 911. In the DC motor 911, the input current is proportional to the output torque. Therefore, when a constant current is input to the DC motor 911, the rotational speed decreases as the torque for rotating the valve body 20 to be driven increases, and the rotational speed increases as the torque decreases. . On the other hand, when the valve body 20 is to be rotated at a constant speed, the DC motor 911 requires a large amount of current if the torque for rotating the valve body 20 is large, and the DC motor 911 requires a small torque. Less current is generated.

The multi-way valve 1 of the present embodiment circulates fluid in five flow states of a non-communication state, a communication state A, a communication state B, a communication state C, and a communication state D. Then, when these communication states change, the fluid circulation state changes, and the torque for rotating the valve body 20 changes.
That is, the torque for rotating the valve body 20 depends on the urging force (pressure) of the valve seat 30 toward the valve body 20 inside the valve casing 10.

  Specifically, in a non-communication state, the pressure of the fluid applied to the secondary side of the valve body 20 inside the valve casing 10 is smaller than the pressure of the fluid applied to the primary side of the valve body 20. Therefore, in the non-communication state, the force applied from the valve seat 30 side to the valve body 20 side is mainly the urging force by the urging member 50. In this state, a force that biases the valve seat 30 to the secondary side by the pressure of the fluid is applied from the primary side of the valve body 20.

  On the other hand, for example, in the communication state A, the fluid flows through the secondary side (the seat side first outlet hole 311 side) of the valve body 20 inside the valve casing 10, so the valve inside the valve casing 10 Fluid pressure is applied to the secondary side and the primary side of the body 20. Therefore, in the communication state A, the force applied from the valve seat 30 side to the valve body 20 side is obtained by adding the pressure of the fluid flowing to the biasing force by the biasing member 50, while the valve seat 20 from the primary side The force for urging 30 to the secondary side is the pressure of the flowing fluid and has a magnitude equal to or lower than the pressure of the fluid in the non-communication state. Therefore, in the communication state A, the torque for rotating the valve body 20 is larger than that in the non-communication state. Thus, when the communication state (that is, the fluid flow state in the multi-way valve 1) changes, the torque for rotating the valve body 20 changes greatly.

  The present inventor rotates the valve body 20 by changing the fluid flow state when the communication state of the multi-way valve 1 changes, that is, when the valve body 20 is located at a predetermined rotation position (predetermined rotation position). We focused on the fact that the torque required to make it change. Then, by detecting this torque change based on the current value input to the DC motor 911 or the detection result of the encoder 921, the predetermined rotational position of the valve body 20 is detected, and this predetermined rotational position is set as the origin position. As a result, it has been found that it is possible to correct the origin position accurately with a simple configuration.

  Specifically, the origin position determination unit 923 can determine the origin position by the following two determination methods. In the present embodiment, a case will be described in which the rotational position of the valve body 20 where the communication state changes from the non-communication state to the communication state A is a predetermined rotational position.

[When rotating the valve body 20 at a constant rotation speed]
In the multi-way valve 1, when performing control to rotate the valve body 20 at a constant rotational speed, the motor control unit 912 directs the DC motor 911 to direct current so that the rotational speed of the DC motor 911 detected by the encoder 921 is constant. Output current. In this case, the torque required to rotate the valve body 20 in the communication state A is larger than the torque required to rotate the valve body 20 in the non-communication state. Therefore, when the multi-way valve 1 is rotated in the forward direction from the closed position (non-communication state), it is necessary to rotate the valve body 20 at the timing when the communication state changes from the non-communication state to the communication state A. Torque increases. Therefore, when the communication state changes from the non-communication state to the communication state A, the motor control unit 912 causes the DC motor 911 to rotate the valve body 20 at the same rotational speed as that in the non-communication state even in the communication state A. Increase the output current value.

  The origin position determination unit 923 monitors the input current value to the DC motor 911 detected by the current detection unit 922. When the communication state changes from the non-communication state to the communication state A, the origin position determination unit 923 detects the input current value to the DC motor 911. Detects changes in the input current value. The origin position determination unit 923 detects the rotational position of the valve body 20 at the time when the change in the input current value is detected as a predetermined rotational position, and determines that the predetermined rotational position is the origin position.

  When an instruction signal related to rotation of the valve body 20 is input, the motor control unit 912 uses the origin position determined by the origin position determination unit 923 as a reference position (origin position) of the rotation operation, and the rotation angle of the valve body 20 And the DC motor 911 is driven.

  As described above, by causing the origin position determination unit 923 to detect the change in the input current value to the DC motor 911 detected by the current detection unit 922, the communication state (fluid flow state) of the multi-way valve 1 changes. The predetermined rotational position can be accurately detected. Therefore, by setting the detected predetermined rotational position as the origin position of the rotational operation of the valve body 20, the opening degree can be accurately adjusted with a simple configuration without providing any other mechanism for measuring the origin position. The multi-way valve 1 can be realized.

[When rotating the valve body 20 at a constant current value]
In the multi-way valve 1, when performing a control to rotate the valve body 20 by inputting a constant current to the DC motor 911, the motor control unit 912 inputs a constant current value to the DC motor 911. In this case, the torque required to rotate the valve body 20 in the communication state A is larger than the torque required to rotate the valve body 20 in the non-communication state. Therefore, when the multi-way valve 1 is rotated in the forward rotation direction from the closed position (non-communication state), the rotational speed of the valve body 20 becomes slow at the timing when the communication state changes from the non-communication state to the communication state A.

  In this case, the origin position determination unit 923 monitors the rotational speed of the DC motor 911 detected by the encoder 921, and the rotational speed of the DC motor 911 accompanying the change of the communication state from the non-communication state to the communication state A. Change (decrease) of the is detected. The origin position determination unit 923 detects the rotation position of the valve body 20 at the time when the change in the rotation speed is detected as a predetermined rotation position, and determines that the predetermined rotation position is the origin position.

  When an instruction signal related to the rotation of the valve body 20 is input, the motor control unit determines the rotation angle of the valve body 20 using the origin position determined by the origin position determination unit as the reference position (origin position) of the rotation operation. Then, the DC motor is driven.

  In this way, by causing the origin position determination unit 923 to detect the rotation speed of the DC motor 911 detected by the encoder 921, the predetermined rotation position where the communication state (fluid circulation state) changes in the multi-way valve 1 can be accurately determined. Be detected. Therefore, by setting the detected predetermined rotational position as the origin position of the rotational operation of the valve body 20, the opening degree can be accurately adjusted with a simple configuration without providing any other mechanism for measuring the origin position. The multi-way valve 1 can be realized.

  In the present embodiment, the origin position determination unit 923 detects the position where the non-communication state and the communication state A are switched as the predetermined rotation position, but the present invention is not limited to this. That is, any one of a position where the communication state A and the communication state B are switched by the origin position determination unit 923, a position where the communication state B and the communication state C are switched, and a position where the communication state C and the communication state D are switched. One or more of them may be detected as a predetermined rotational position. That is, the origin position determination unit 923 detects the rotation position of the valve body 20 where a predetermined change occurs in the fluid flow state as the predetermined rotation position regardless of whether the rotation direction of the valve body 20 is the normal rotation direction or the reverse rotation direction. Can be made.

According to the multi-way valve 1 of the present embodiment described above, the following effects are obtained.
In the multi-way valve 1, the torque for rotating the valve body 20 depends on the urging force (pressure) of the valve seat 30 toward the valve body 20 inside the valve casing 10. It greatly changes at the timing when the fluid flow state (communication state) changes. Therefore, the multi-way valve 1 includes a DC motor 911 that rotates the valve body 20, a current detection unit 922 that detects a current value flowing through the rotor of the DC motor 911, an encoder 921 that detects the rotation speed of the DC motor 911, and a DC motor. A predetermined change in the flow state of the fluid based on the detection result of the motor control unit 912 that controls the operation of the 911 and the detection result of the current detection unit 922 or the encoder 921 when the DC motor 911 is operated under a predetermined condition An origin position determination unit 923 that detects a predetermined rotation position where the occurrence of the rotation occurs and determines the predetermined rotation position as the origin position of the rotation operation.

As a result, when the valve body 20 is rotated at a constant rotational speed, the origin position determination unit 923 detects a change in the input current value to the DC motor 911 detected by the current detection unit 922. The predetermined rotational position where the communication state (fluid flow state) changes in the valve 1 can be accurately detected.
When the valve body 20 is rotated at a constant current value, the origin position determination unit 923 detects the rotational speed of the DC motor 911 detected by the encoder 921, so that the multi-way valve 1 is in a communicating state (fluid It is possible to accurately detect a predetermined rotational position at which the distribution state of the gas changes.

  Therefore, by using the detected predetermined rotational position as the origin position of the rotation operation of the valve body 20, the opening degree can be accurately adjusted with a simple configuration without providing any other mechanism for measuring the origin position. The valve 1 can be realized.

[Modification]
The preferred embodiment of the multi-way valve 1 of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be modified as appropriate.

  For example, in the present embodiment, the valve body 20 is formed in a spherical shape, but is not limited thereto. That is, the valve body only needs to have a circular cross section perpendicular to the axis, and the valve body may be formed in a columnar shape or a conical column shape.

  Moreover, in this embodiment, although the valve apparatus of this invention was applied to the multiway valve 1, it is not restricted to this. That is, the valve device of the present invention may be applied to a flow rate adjusting valve having one fluid inlet and one fluid outlet. That is, the present invention can be applied to all valve devices having a configuration in which the flow state of the fluid is changed by rotating the valve body with respect to the valve seat.

1 Multi-way valve (valve device)
DESCRIPTION OF SYMBOLS 10 Valve casing 20 Valve body 21 Body side inlet hole 22 Body side outlet hole 30 Valve seat 31 1st valve seat 32 2nd valve seat 50 Energizing member 91 Drive mechanism 112 Fluid inlet flow path 131 1st fluid outlet flow path 141 1st 2 fluid outlet channel 311 1st sheet side outlet hole 321 2nd sheet side outlet hole 911 DC motor 912 motor control unit 921 encoder 922 current detection unit 923 origin position determination unit

Claims (4)

A valve body; a valve body having a circular cross-section perpendicular to the axis accommodated in the valve casing so as to be rotatable around a central axis; and a valve seat disposed in the valve casing in contact with the valve body; A valve device comprising:
A biasing member that biases the valve seat toward the valve body;
A DC motor for rotating the valve body;
A current detection unit for detecting a current value flowing through the rotor of the DC motor;
An encoder for detecting the rotational speed of the DC motor;
A motor control unit for controlling the operation of the DC motor;
Based on a detection result of the current detection unit or a detection result of the encoder when the DC motor is operated under a predetermined condition, a predetermined rotation position where a predetermined change occurs in a fluid flow state is detected, and the predetermined rotation An origin position determination unit that determines the position as the origin position of the rotation operation;
A valve device comprising: The motor control unit operates the DC motor so that the rotation speed detected by the encoder is constant,
The valve device according to claim 1, wherein the origin position determination unit detects the predetermined rotation position based on a change in the current value detected by the current detection unit. The motor control unit operates the DC motor so that the current value detected by the current detection unit is constant,
The valve device according to claim 1, wherein the origin position determination unit detects the predetermined rotation position based on a change in the rotation speed detected by the encoder. A valve casing comprising a fluid inlet channel, a first fluid outlet channel, and a second fluid outlet channel;
A valve body having a circular cross section perpendicular to the axis and accommodated in the valve casing so as to be rotatable about a central axis, the body side inlet hole opening along the central axis and extending along the central axis; and A valve body having one or two body-side outlet holes that are open and formed continuously with the body-side inlet hole;
A valve seat disposed in the valve casing in contact with a side surface of the valve body, the first valve seat disposed on the first fluid outlet channel side and having a seat-side first outlet hole; And a valve seat made of a second valve seat disposed on the second fluid outlet channel side and having a seat-side second outlet hole formed thereon,
The body side outlet hole, the seat side first outlet hole, and the seat side second outlet hole, when the valve body is rotated forward around the central axis,
(I) a non-communication state in which the opening of the body side outlet hole does not communicate with any of the seat side first outlet hole and the seat side second outlet hole;
(Ii) The opening of the body side outlet hole communicates only with the seat side first outlet hole, and discharge from the seat side first outlet hole as the rotational angle of the valve body in the forward rotation direction changes. A communication state A in which the flow rate of the fluid to be proportionally increased;
(Iii) Even if the opening portion of the body side outlet hole communicates only with the seat side first outlet hole and the rotation angle of the valve body in the normal rotation direction changes, the opening from the seat side first outlet hole Communication state B in which the flow rate of the discharged fluid does not change;
(Iv) The opening of the body side outlet hole communicates with both the seat side first outlet hole and the seat side second outlet hole, and as the rotation angle of the valve body in the forward rotation direction changes, A communication state C in which the flow rate of the fluid discharged from the sheet side second outlet hole increases proportionally while the flow rate of the fluid discharged from the sheet side first outlet hole does not change; and
(V) Even if the opening of the body side outlet hole communicates with both the seat side first outlet hole and the seat side second outlet hole and the rotation angle of the valve body in the forward rotation direction changes. The number of the body side outlet holes and the number of the outlet holes so that the flow state is switched in the order of the communication state D in which the flow rate of the fluid discharged from the seat side first outlet hole and the sheet side second outlet hole does not change. Relative position and shape are set,
The origin position determination unit includes a position where the non-communication state and the communication state A are switched, a position where the communication state A and the communication state B are switched, a position where the communication state B and the communication state C are switched, and a communication state and the communication state C. The valve device according to any one of claims 1 to 3, wherein any one or more of the positions where the state D is switched is detected as the predetermined rotational position.

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