JP2019158130A - Multiway valve and fluid control device having the multiway valve - Google Patents

Abstract

To provide a multiway valve for properly correcting a position of a valve body, and a fluid control device having the multiway valve.SOLUTION: A multiway valve 1 comprises: a rotating plate 921 which rotates in synchronization with the rotation of a valve body 20, and in which a slit 924 is formed; a light permeation detection part 922 for detecting permeation light and block light by the rotating plate 921; and an origin position determination part 923 for determining edges 924a, 924b of the slit 924 detected by the light permeation detection part 922 as origin positions of the valve body 20. The two edges 924a, 924b of the slit 924 are arranged so as to sandwich an intermediate point M of a rotation region of the valve body 20 corresponding to a communication state B. The origin position determination part 923 determines one edge 924a as a first origin position of a rotation motion, and determines the other edge 924b as a second origin position of the rotation motion.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a multi-way valve and a fluid control apparatus including the multi-way valve.

  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 rotating a valve body with a drive mechanism.

  When such a flow control valve is used in a combustion device, a predetermined position in the closed position of the valve body is set as the origin position in order to accurately control the opening of the flow control valve operated (rotated) by the drive mechanism. The origin position is detected at the start of combustion. 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.

  By the way, the combustion apparatus is provided with the several nozzle which injects fuel, and the technique which controls the combustion state of a combustion apparatus by changing the number of nozzles which supply fuel is proposed (for example, refer patent document 1). ).

JP 2005-147558 A

  In such a combustion apparatus, it is necessary to arrange a flow rate adjustment valve that adjusts the supply of fuel corresponding to the nozzle that injects the fuel, and the number of components for configuring the combustion apparatus increases. Therefore, a multi-way valve is required as a flow rate adjustment valve capable of supplying a fluid such as fuel to a plurality of supply destinations. Even in such a multi-way valve, it is required to appropriately correct the position of the valve body.

  Accordingly, it is an object of the present invention to provide a multi-way valve that can appropriately correct the position of the valve body and a fluid control device including the multi-way valve.

  The present invention includes a valve casing including a fluid inlet channel, a first fluid outlet channel, and a second fluid outlet channel, and an axially perpendicular cross section accommodated in the valve casing so as to be rotatable around a central axis. A circular valve body having a body-side inlet hole that opens to the surface and extends along the central axis; and one or two holes that are open to the surface and formed continuously to the body-side inlet hole A valve body having a body-side outlet hole and a valve seat disposed in the valve casing in contact with the valve body, the valve seat being disposed on the first fluid outlet channel side, wherein the seat-side first outlet hole is A first valve seat formed; and a valve seat comprising a second valve seat disposed on the second fluid outlet channel side and having a seat-side second outlet hole formed therein; A driving mechanism that rotates, a rotating plate that rotates in synchronization with the rotation of the valve body, and a slit formed in the rotating plate, which is sandwiched between two edges separated by a predetermined angle in the rotating direction of the rotating plate A light transmission detecting unit configured to detect light transmission and light shielding by the rotating plate, and the edge of the slit detected by the light transmission detection unit. An origin position determination unit that determines the origin position of the body, and the body side outlet hole, the seat side first outlet hole, and the seat side second outlet hole cause the valve body to rotate forward around the central axis. (I) a non-communication state in which the opening of the body side outlet hole is not in communication with any of the seat side first outlet hole and the seat side second outlet hole; (ii) Opening However, 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 only in communication with the seat side first outlet hole. Communicating state A; (iii) Even if the opening of the body side outlet hole communicates only with the seat side first outlet hole and the rotational angle of the valve body in the forward rotation direction changes, 1 communication state B in which the flow rate of the fluid discharged from the exit hole does not change; (iv) the opening of the body side exit hole communicates with both the sheet side first exit hole and the sheet side second exit hole; As the rotation angle of the valve body in the forward rotation direction changes, the flow rate of the fluid discharged from the seat side second outlet hole increases proportionally, while being discharged from the seat side first outlet hole. Communication state where fluid flow rate does not change State C; and (v) 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. Of the body-side outlet hole 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. The number and the relative positional relationship and shape of each outlet hole are set, and the two edges of the slit are arranged so as to sandwich the intermediate point of the rotation region of the valve body corresponding to the communication state B, The origin position determination unit determines the one edge portion detected on the communication state A side from the intermediate point as a first origin position of the rotation operation; detected on the communication state C side from the intermediate point The other edge to be rotated Relates to a multi-way valve determines that the origin position.

  Further, the present invention is a fluid control apparatus including the above-described multi-way valve, wherein a signal output unit that outputs an instruction signal of the rotation angle to the drive mechanism by a current value or a voltage value, and the current in a set range A storage unit that stores the value or the voltage value and the rotation angle in association with each other, and the storage unit relates to a fluid control device that allocates and stores the setting range in a biased manner in the communication state A and the communication state C. .

  ADVANTAGE OF THE INVENTION According to this invention, the fluid control apparatus provided with the multi-way valve which can correct | amend the position of a valve body appropriately, and this multi-way valve can be provided.

It is a figure which shows the structure of the combustion apparatus which comprises the multi-way valve and fluid control apparatus which concern on embodiment of this invention. It is a figure which shows the multi-way valve which concerns on embodiment of this invention. It is a figure which shows the valve body in the multiway valve of this 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 multiway valve of this 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 this 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 the line BB of (a). It is a top view which shows partially the rotating plate in the multiway valve of this embodiment. It is a figure explaining operation | movement of the multi-way valve of this embodiment, (a) shows a non-communication state, (b) shows a 1st communication state, (c) shows a 2nd communication state. It is a figure which shows an example of the relationship between the rotation angle of a valve body or the instruction | indication electric current value, and flow volume in the multiway valve of this embodiment, (a) shows the relationship between the rotation angle of a valve body, and flow volume, (b) is. The relationship between the command current value and the flow rate when the command current value is equally assigned to the rotation angle of the valve body is shown. (C) is biased to the rotation angle of the valve body corresponding to the communication state A and the communication state C. The relationship between the command current value and the flow rate when the command current value is assigned.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The multi-way valve according to the present embodiment and the fluid control apparatus including the multi-way valve are applied to a combustion apparatus such as a boiler that generates liquid by burning liquid fuel or gaseous fuel, and combustion of fuel (fluid) in the fuel apparatus Control the state.

  As shown in FIG. 1, the combustion apparatus 200 includes a fuel supply path L1 in which an upstream side is connected to a fuel tank 210 and a downstream side is connected to a combustion chamber 220, a pump P disposed in the fuel supply path L1, and a combustion chamber 220. And a plurality of nozzles (first nozzle 121, second nozzle 122 and third nozzle 123) connected to the front end side of the fuel supply path L1, and a plurality of valves (electromagnetic) disposed in the fuel supply path L1. The valves V1 to V4, the multi-way valve 1), and a controller 230 that controls the opening / closing or opening of the plurality of valves are provided.

The fuel supply path L1 includes a main path L11 whose upstream side is connected to the fuel tank 210, and three paths L12, L13a, and L13b branched from the main path L11. More specifically, the main route L11 branches into a first route L12 and a second route L13 at an intermediate position, and the second route L13 further branches into two routes L13a and L13b at an intermediate position. .
The pump P is disposed on the main path L11.
The 1st nozzle 121, the 2nd nozzle 122, and the 3rd nozzle 123 are connected to the tip side of the 1st course L12, course L13a, and course L13b, respectively.

In this embodiment, electromagnetic valves V1, V2, V3, V4 and a multi-way valve 1 are provided as a plurality of valves.
The solenoid valve V1 is disposed on the main path L11 and opens and closes the main path L11. The electromagnetic valve V2 is disposed in the first path L12 and opens and closes the first path L12. The electromagnetic valve V3 is disposed in the path L13a and opens and closes the path L13. The electromagnetic valve V4 is disposed in the path L13b and opens and closes the path L13b.

  The multi-way valve 1 is disposed at a branch portion between the second path L13, the path L13a, and the path L13b. The multi-way valve 1 is a valve mechanism whose opening degree can be adjusted. The multi-way valve 1 communicates the second path L13 only with the path L13a in the range of the first opening from the closed state, and the second path L13 in the range of the first opening to the second opening. Communicate with both L13a and path L13b. Thereby, by adjusting the opening degree of the multi-way valve 1, a state in which the fuel supplied from the second path L13 is supplied only to the path L13a side and a state in which the fuel is supplied to both the path L13a and the path L13b are switched. It is possible. The multi-way valve 1 can proportionally change the amount of fuel ejected from the second nozzle 122 through the path L13a or the amount of fuel ejected from the third nozzle 123 through the path L13b according to the opening.

The details of the multi-way valve 1 of the present embodiment will be described with reference to FIGS.
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 a valve casing 10, a valve body 20, a valve seat 30, a valve stem 40, a biasing member 50, a drive mechanism 91 that rotates the valve body 20, and a reference position of the valve body 20. And a position detection unit 92 that performs the above-described operation.

The valve casing 10 is formed in a box shape having a hollow portion and constitutes the outer shape of the multi-way valve 1. 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 first 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. 7). 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. 7).

  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). Moreover, as shown in FIG.3 (c), the body side 1st exit hole 221 and the body side 2nd exit hole 222 are extended so that the angle (theta) which mutually makes becomes an obtuse angle (for example, 160 degree | times).

  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 this embodiment, as shown in FIG. 2, 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. 4A and 4B, 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 first 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. 5A and 5C, 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 first 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 first 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 stepping motor and a drive circuit. The drive mechanism 91 is connected to the valve stem 40 via the speed reduction mechanism 93. The drive circuit outputs a pulse signal corresponding to the number of steps to the stepping motor so as to rotate the valve body 20 at a rotation angle (number of steps) associated with the input instruction signal (current value or voltage value). To do. Then, the stepping motor rotates the valve body 20 around the central axis X as a rotation center by rotating the valve stem 40 by a predetermined rotation angle (number of steps).

  The position detector 92 detects the reference position of the valve body 20. The position detection unit 92 includes a rotating plate 921 in which a slit 924 is formed, a light transmission detection unit 922, and an origin position determination unit 923.

The rotating plate 921 is formed in a disc shape, and is attached to the valve stem 40 so that the plate surface is along a direction orthogonal to the axial direction of the valve stem 40. Thereby, the rotating plate 921 rotates in synchronization with the valve stem 40 and the valve body 20.
As shown in FIG. 6, the slit 924 is formed by cutting the rotary plate 921 into a shape sandwiched between two edge portions 924 a and 924 b separated by a predetermined angle in the rotation direction of the rotary plate 921.

  The light transmission detection unit 922 detects light transmission and light shielding by the rotating plate 921. The light transmission detector 922 includes a light emitting element and a light receiving element. The light transmission detection unit 922 is disposed such that the light emitting element and the light receiving element sandwich the rotating plate 921.

  According to the light transmission detection unit 922 described above, the rotating plate 921 rotates in synchronization with the rotation of the valve stem 40. The light transmission detecting unit 922 rotates in synchronization with the valve stem 40 and the valve stem 40 by detecting the position of the slit 924 of the rotating plate 921 based on whether or not light is received from the light emitting element by the light receiving element. A reference position of the valve body 20 is detected.

  The origin position determination unit 923 determines the positions of the edge portions 924 a and 924 b of the slit 924 detected by the light transmission detection unit 922 as the origin position of the valve body 20. Details of the determination of the origin position by the origin position determination unit 923 will be described later.

  The above multi-way valve 1 has the following five communication states. The communication state of the multi-way valve 1 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. 7A, 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 112 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 having a small opening area of the seat-side first outlet hole 311 (see FIG. 4), 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. 7C, 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 112 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.

  The control unit 230 controls the opening and closing of the electromagnetic valves V1, V2, V3, and V4, controls (adjusts) the opening degree of the multi-way valve 1, and controls the operation of the pump P to control the combustion of the combustion device 200. Control the state. The control unit 130 is realized by a computer including a memory, a timer, and an arithmetic processing unit. Details of the control of the opening degree of the multi-way valve 1 by the control unit 230 will be described later.

  The above combustion apparatus 200 includes (1) a combustion stop state, (2) a first combustion state in which fuel is injected from the first nozzle 121 and burns, and (3) fuel is injected from the first nozzle 121 and the second nozzle 122. Combustion is possible in the four combustion states of the second combustion state in which the fuel is burned and (4) the third combustion state in which the fuel is injected from the first nozzle 121, the second nozzle 122 and the third nozzle 123 and combusts. ing.

(1) Combustion stop state In the combustion stop state, all valves are closed and fuel is not ejected from any of the first nozzle 121, the second nozzle 122, and the third nozzle 123.

(2) First Combustion State In the first combustion state, the pump P is driven and the electromagnetic valve V1 and the electromagnetic valve V2 are opened. As a result, fuel is ejected from the first nozzle 121 through the main path L11 and the first path L12, and combustion of the combustion device 200 is started by igniting the ejected fuel. Here, since the solenoid valve V1 and the solenoid valve V2 are open / close switching valves, the combustion amount in the first combustion state is constant. In the present embodiment, the combustion amount in the first combustion state is set to 25% of the maximum combustion amount. In the combustion stop state and the first combustion state, the multi-way valve 1 is closed and is in a non-communication state.

(3) Second Combustion State In the second combustion state, the electromagnetic valve V3 is further opened from the first combustion state, and the multi-way valve 1 is between the closed state (opening degree 0) and the first opening degree. Is opened at a predetermined opening. Accordingly, fuel is also ejected from the second nozzle 122 through the second path L13 and the path L13a, and the combustion amount is increased. This second combustion state corresponds to the range of the communication state A and the communication state B in the multi-way valve 1. Here, since the multi-way valve 1 can proportionally change the amount of fuel ejected from the second nozzle 122 in accordance with the opening degree in the communication state A, the combustion amount in the second combustion state can also be proportionally changed. . In the present embodiment, the amount of combustion by the fuel ejected from the second nozzle 122 is set to be proportionally changeable within a range of 0 to 30% of the maximum combustion amount. Therefore, the combustion amount in the second combustion state is set in a range of 25% to 55% of the maximum combustion amount.

(4) Third Combustion State In the third combustion state, the electromagnetic valve V4 is further opened from the second combustion state, and the multi-way valve 1 has a predetermined value between the first opening and the second opening. It is opened at the opening. As a result, fuel is also ejected from the third nozzle 123 through the path L13b, and the amount of combustion is increased. This third combustion state corresponds to the range of the communication state C and the communication state D in the multi-way valve 1. Here, in the multi-way valve 1, in the communication state C, the amount of fuel ejected from the second nozzle 122 is constant, while the amount of fuel ejected from the third nozzle 123 can be changed proportionally. Thereby, the combustion amount in the third combustion state is also changed proportionally. In the present embodiment, the amount of combustion by the fuel ejected from the third nozzle 123 is set to be proportionally changeable within a range of 0 to 45% of the maximum combustion amount. Therefore, the combustion amount in the third combustion state is set in the range of 55% to 100% of the maximum combustion amount.

  Thus, in the combustion apparatus 200 of the present embodiment, the combustion amount is controlled stepwise (0% or 25%) between the combustion stop state and the first combustion state, and the second combustion state (25% to 25%). 55%) and the third combustion state (55% to 100%), the combustion amount is continuously controlled.

Next, the determination of the origin position by the origin position determination unit 923 in the multi-way valve 1 and the control of the opening degree of the multi-way valve 1 will be described with reference to FIG.
In the present embodiment, the origin position of the multi-way valve 1 having the five communication states (the non-communication state and the communication states A to D) is set to a position corresponding to the communication state A to the communication state B. By including the position and the second origin position arranged at the position corresponding to the communication state B to the communication state C, more accurate correction of the origin position is realized.

  More specifically, as described above, the origin position determination unit 923 detects the positions of the two edges 924a and 924b of the slit 924 formed in the rotating plate 921 by the light transmission detection unit 922, and the valve body 20 It is determined as the origin position. Here, in the present embodiment, as shown in FIG. 6, the two edges 924 a and 924 b of the slit 924 are arranged so as to sandwich the intermediate point M of the rotation region of the valve body 20 corresponding to the communication state B. . Then, the origin position determination unit 923 was allowed to determine one edge 924a as the first origin position, and the other edge 924b was determined as the second origin position.

  Thereby, when changing the opening degree of the valve body 20, when the opening degree is changed from the communication state B to the communication state A, and when the opening degree is changed from the communication state B to the communication state C, respectively. In other words, the origin position determined by the origin position determination unit 923 (in each of the cases where the combustion amount is proportionally decreased and increased from the combustion state at the maximum combustion amount (55%) in the second combustion state in the combustion apparatus 200). Can be determined. Therefore, since the origin position of the valve body 20 can be determined with high frequency, the origin position can be corrected more accurately.

  Here, one edge portion 924a is located in the rotation region of the valve body 20 in the communication state A side from the intermediate point M, but as shown in FIG. In addition to the positioning, the valve body 20 may be positioned in the rotation region of the communication state A. The other edge 924b is located in the rotation region of the valve body 20 in the communication state C side with respect to the intermediate point M, but is located in the rotation region of the valve body 20 in the communication state B as shown in FIG. It may be located not only in the case of making it, but in the rotation region of the valve body 20 in the communication state C. In any case, it is preferable that the two edge portions 924a and 924 are spaced apart from the intermediate point M at equal intervals.

  Next, control of the opening degree of the multi-way valve 1 by the control unit 230 will be described. The control unit 230 controls the combustion state of the combustion device 200 by adjusting the opening / closing of the plurality of electromagnetic valves V1 to V4 and the opening degree of the multi-way valve 1. That is, in the present embodiment, the control unit 230, the plurality of electromagnetic valves V1 to V4, and the multi-way valve 1 constitute the fluid control device 100 that controls the amount of fuel burned in the combustion device 200.

  The control unit 230 includes a storage unit 231 and a signal output unit 232 as a configuration for controlling the opening degree of the multi-way valve 1.

The storage unit 231 stores various data necessary for controlling the combustion state of the combustion apparatus 200 by the control unit 230.
In the present embodiment, the storage unit 231 stores the current value in the setting range and the rotation angle of the valve body 20 in association with each other. More specifically, the rotation angle of the valve body 20 (the opening degree of the multi-way valve 1) is stored in the storage unit 231 in association with a current value in a predetermined range (for example, 4 mA to 20 mA). Further, the storage unit 231 stores a required load on the combustion device 200 (for example, a steam load of a steam boiler) and a required combustion amount of the combustion device 200 according to the required load in association with each other. Furthermore, the storage unit 231 includes the required combustion amount of the combustion device 200, the opening / closing conditions of the plurality of electromagnetic valves V1 to V4 according to the required combustion amount, and the opening degree of the multi-way valve 1 (the rotation angle of the valve body 20). Are stored in association with each other.

  The signal output unit 232 outputs an instruction signal regarding the rotation angle of the valve body 20 to the drive mechanism 91 as a current value. More specifically, in the present embodiment, the control unit 230 receives, for example, a signal related to the required load, and determines a required combustion amount by the combustion device 200 based on the received signal. Further, the control unit 230 determines the opening / closing conditions of the plurality of electromagnetic valves V1 to V4 and the opening of the multi-way valve 1 for burning the combustion apparatus 200 with the determined required combustion amount. And the signal output part 232 outputs the instruction | indication signal regarding opening / closing of each solenoid valve with respect to several solenoid valves V1-V4, and the opening degree (valve of multiway valve 1 with respect to the multiway valve 1 (drive mechanism 91)). An instruction signal relating to the rotation angle of the body 20 is output as a current value.

  When the instruction signal from the signal output unit 232 is input, the drive mechanism 91 (drive circuit) has a number of steps such that the valve body 20 is rotated at a rotation angle (step number) associated with the input current value. The pulse signal corresponding to the number of times is output to the stepping motor. Thereby, the valve body 20 rotates. Note that the drive circuit has a rotation angle (number of steps) associated with the input current value based on a correspondence relationship similar to the correspondence relationship between the current value stored in the storage unit 231 and the rotation angle of the valve body 20. ) The vibration pulse signal corresponding to the number of times is output.

  Here, the multi-way valve 1 of the present embodiment is discharged when the opening degree changes, the communication state B and the communication state D where the flow rate of the fluid (fuel) discharged does not change even if the opening degree changes. A communication state A and a communication state C in which the flow rate of the fluid changes proportionally.

  Therefore, in the present embodiment, the current value in the set range is not uniformly assigned over all the communication states (that is, the entire movable range of the valve body 20), and the communication state in which the flow rate changes proportionally according to the change in the opening degree. Allocation is biased to A and communication state C.

The relationship between the opening degree of the valve body 20 and the communication state (flow rate of fluid to be discharged) of the multi-way valve 1 will be described with reference to FIG.
FIG. 8A shows an example of the relationship between the rotation angle (0 to 36 degrees) of the valve body 20 in the multi-way valve 1 and the flow rate of the discharged fluid. As shown in FIG. 8A, the multi-way valve 1 has a flow rate proportionally in the communication state A (rotation angle 0 degree to about 11 degrees) and the communication state C (rotation angle about 23 degrees to about 31 degrees). In the communication state B (rotation angle of about 11 degrees to about 23 degrees) and the communication state D (rotation angle of about 31 degrees to about 37 degrees), there is no change in the flow rate. In this multi-way valve 1, if the current value in the set range (here, 4 mA to 20 mA) is evenly allocated over all the communication states (that is, the entire movable range of the valve body 20), the relationship between the current value and the flow rate. Is as shown in FIG.

  In this case, since current values in the range of about 9 mA to about 13 mA and about 17 mA to 20 mA are assigned to the communication state B and the communication state D, respectively, the communication state A and the communication state in which the flow rate changes proportionally. The ranges of current values assigned to C are in the range of 4 mA to about 9 mA and about 13 mA to about 17 mA, respectively. Therefore, in the communication state A and the communication state C in which the flow rate change with the change in the rotation angle is large, the width between the current values set corresponding to each set flow rate becomes narrow, and accurate flow rate control becomes difficult.

On the other hand, when the current value in the set range is assigned to the communication state A and the communication state C in which the flow rate changes proportionally according to the change in the opening degree, the relationship between the current value and the flow rate is as shown in FIG. As shown.
In this case, by allocating most of the current value in the set range to the communication state A and the communication state C, the communication state A and the communication state C in which the flow rate changes greatly due to the change in the rotation angle corresponds to each set flow rate. A sufficient width between the set current values can be secured. Therefore, accurate flow rate control is possible. On the other hand, since the flow rate according to the rotation angle does not change in the communication state B and the communication state D, the influence due to the reduction of the range of current values assigned in the communication state B and the communication state D is suppressed.

  According to the present embodiment described above, in the multi-way valve 1 having five communication states (non-communication state and communication states A to D), the two edge portions 924a and 925b correspond to the rotation region corresponding to the communication state B. The rotating plate 921 having the slits 924 formed so as to sandwich the intermediate point M was rotated in synchronization with the valve body 20. Then, the origin position determination unit 923 determines the position where the one edge 924a is detected by the light transmission detection unit 922 as the first origin position, and the position where the other edge 924b is detected as the second origin position. I was judged.

Thereby, for example, during the control in the first combustion state (non-communication state), the amount of combustion increases, and one edge portion 924a is detected by the light transmission detection unit 922 (change from detection OFF to ON), or During the control in the second combustion state (communication state B), when the combustion amount is reduced and one edge 924a is detected (change from detection ON to OFF), the origin position determination unit 923 performs the first Determine the origin position. Then, the control unit 130 controls the rotation angle (number of steps) of the valve body 20 based on the first origin position.
Further, during the control in the second combustion state (communication state B), the amount of combustion increases and the other edge 924b is detected by the light transmission detection unit 922 (change from detection ON to OFF), or the third combustion During the control in the state (communication state D), when the amount of combustion decreases and the other edge 924b is detected (change from detection OFF to ON), the origin position determination unit 923 sets the second origin position. judge. Then, the control unit 230 controls the rotation angle (number of steps) of the valve body 20 based on the second origin position.

  As described above, in the combustion apparatus 200, when the opening degree of the multi-way valve 1 is changed in accordance with the change in the fuel amount, the origin position determination unit 923 can determine a plurality of origin positions. 20 position corrections can be made.

  In addition, the fluid control device 100 (control unit 230) includes a signal output unit 231 that outputs an instruction signal of the rotation angle of the valve body 20 to the drive mechanism 91 as a current value, a current value in the set range, and the valve body 20 And a storage unit 231 that stores the rotation angle in association with each other, and assigns the current value of the setting range to the communication state A and the communication state C in which the flow rate changes proportionally according to the change in the opening degree. It was. Thereby, the range of the current value assigned to the communication state B and the communication state D in which the flow rate does not change even when the rotation angle of the valve body 20 changes is reduced, and the communication with a large flow rate change according to the rotation angle of the valve body 20 is achieved. A wide range of current values can be assigned to the state A and the communication state C. Therefore, fine flow rate control can be performed.

[Modification]
The preferred embodiment of the multi-way valve 1 and the fluid control device 100 of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed.

  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.

  In the present embodiment, the signal output unit 232 is caused to output the rotation angle instruction signal for the drive mechanism 91 by the current value, but the present invention is not limited to this. That is, the rotation angle instruction signal may be output with a voltage value within a set range (for example, 1 V to 5 V). Also in this case, the voltage value in the set range is allocated to the communication state A and the communication state C in which the flow rate changes proportionally according to the change in the opening degree.

DESCRIPTION OF SYMBOLS 1 Multi-way valve 10 Valve casing 20 Valve body 21 Body side inlet hole 22 Body side outlet hole 30 Valve seat 31 First valve seat 32 Second valve seat 40 Valve stem 91 Drive mechanism 100 Fluid control device 112 Fluid inlet channel 131 First Fluid outlet channel 141 Second fluid outlet channel 221 Body side first outlet hole 222 Body side second outlet hole 231 Storage unit 232 Signal output unit 311 Sheet side first outlet hole 321 Sheet side second outlet hole 921 Rotating plate 922 Light transmission detector 923 Origin position determination unit 924 Slit 924a One edge 924b The other edge

Claims (2)

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 the valve body, the first valve seat being disposed on the first fluid outlet channel side and having a seat-side first outlet hole; and A valve seat comprising a second valve seat disposed on the second fluid outlet channel side and having a seat-side second outlet hole formed;
A drive mechanism for rotating the valve body;
A rotating plate that rotates in synchronization with the rotation of the valve body;
A slit formed in the rotating plate, which is sandwiched between two edges spaced apart by a predetermined angle in the rotating direction of the rotating plate;
A light transmission detector comprising a pair of light emitting elements and light receiving elements, and detecting light transmission and light shielding by the rotating plate;
An origin position determination unit that determines the edge of the slit detected by the light transmission detection unit as an origin position of the valve body,
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 respective outlets 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 sheet-side first outlet hole and the sheet-side second outlet hole does not change. The relative positional relationship and shape of the holes are set,
The two edges of the slit are arranged so as to sandwich the midpoint of the rotation region of the valve body corresponding to the communication state B,
The origin position determination unit determines the one edge portion detected on the communication state A side from the intermediate point as a first origin position of the rotation operation; detected on the communication state C side from the intermediate point The multi-way valve which determines the said other edge part to be the 2nd origin position of rotation operation. A fluid control device comprising the multi-way valve according to claim 1,
A signal output unit that outputs an instruction signal of the rotation angle to the drive mechanism by a current value or a voltage value;
A storage unit that stores the current value or the voltage value of the setting range in association with the rotation angle;
The storage unit is a fluid control apparatus that allocates and stores the setting range in a biased manner in the communication state A and the communication state C.

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