JP2012047327A - Flow rate adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem with a conventional flow rate adjusting device, wherein a flow resistance is increased since a flow direction of fluid is bent at about 90° in a casing, thereby a flow rate cannot be secured without enlarging an internal space of the casing, a motor for driving a flow rate adjusting mechanism is placed on the casing, and thus, there occurs such a malfunction that the flow rate adjusting device is further enlarged as a whole.SOLUTION: A rotor of the motor is arranged in the casing, gas is made to pass a porion arranged with the rotor by arranging a flow-in part and a flow-out part at positions which oppose each other with the rotor sandwiched therebetween, respectively, and a flow rate adjusting part is arranged at either the flow-in part and the flow-out part.

Description

  The present invention relates to a flow rate adjusting device interposed in the middle of a gas passage to increase or decrease the flow rate of gas.

  As a conventional flow control device of this type, for example, as a flow control device for adjusting the flow rate of refrigerant, an inflow portion that opens to the side of a cylindrical casing and an outflow portion that opens to the bottom of the casing are provided. A motor is mounted on the upper surface of the casing, and the lower end of the rotor shaft of the motor is inserted into the casing to drive the flow rate adjusting mechanism in the casing (see, for example, Patent Document 1). ).

Japanese Patent Laid-Open No. 2003-148643 (FIG. 1)

  In the conventional flow rate adjusting device, fluid flows into the casing from the inflow portion provided on the side of the casing. However, since the outflow portion is formed at the bottom of the casing, the flow direction of the fluid is approximately 90 degrees in the casing. It will be bent. Thus, if the flow direction of the fluid is greatly bent, the flow resistance increases, and therefore, the flow rate cannot be secured unless the internal space of the casing is increased. Therefore, the problem that a casing enlarges arises. Further, since the motor for driving the flow rate adjusting mechanism is mounted on the upper portion of the casing and the lower end of the rotor shaft is inserted into the casing, the entire flow rate adjusting device is mounted on the casing and the upper portion of the casing. Therefore, there is a problem in that the casing is increased in size and the volume of the motor is added, and the flow control device is further increased in size.

  Then, this invention makes it a subject to provide the flow volume adjustment apparatus which can be reduced in size as much as possible in view of said problem.

  In order to solve the above problems, a flow control device according to the present invention is provided in the middle of a gas passage, and includes an inflow portion through which gas is introduced into a casing and an outflow portion through which gas flows out from the casing. In the flow control device having a flow control unit that increases or decreases the flow rate of the gas that is driven and flows out from the outflow part, the rotor of the motor is disposed in the casing, and the inflow part and the outflow are located at positions facing each other across the rotor. Each of which is provided so that the gas passes through a portion where the rotor is disposed, and the flow rate adjusting portion is provided in one of the inflow portion and the outflow portion.

  In the above configuration, since the motor rotor is disposed in the casing, it is possible to reduce the size of the entire apparatus by omitting the volume of the motor mounted on the upper portion of the casing. Further, since the inflow portion and the outflow portion are formed at positions facing each other across the rotor, the flow of gas flowing into the casing from the inflow portion passes through the portion where the rotor is disposed without being bent as it is. Will flow to the club. For this reason, since the gas flow direction is not bent in the casing, the flow resistance becomes as small as possible.

  The flow control device does not necessarily have a closing function. However, when the closing function is provided, the flow control unit is provided with a closing function, and the closing function can stop the outflow of gas from the outflow part. That's fine.

  Alternatively, the flow rate adjusting unit may be provided in one of the inflow part and the outflow part, and the other may be provided with a closing mechanism that is driven by a motor and stops the outflow of gas from the outflow part.

  As can be seen from the above description, the present invention has been designed so that the rotor of the motor is disposed in the casing and the flow direction of the gas in the casing is not bent. Can be significantly smaller than

Perspective view showing the appearance of the flow control device Sectional view showing the internal structure of the flow control device III-III cross section The figure which shows the operation state of the flow control part Sectional drawing which shows the internal structure of the flow control apparatus in other embodiment. VI-VI cross section Diagram showing the operating state of the closing mechanism

  Referring to FIG. 1, reference numeral 1 denotes a flow rate adjusting device according to the present invention, which is used to increase or decrease the flow rate of gas supplied to a burner of a gas appliance. As shown in the figure, the outer shape of the flow rate adjusting device 1 has a substantially cylindrical shape, and in the posture shown in the figure, it is installed so as to be sandwiched between an inflow pipe IN connected to the bottom and an outflow pipe OUT connected to the top. In the figure, it flows from bottom to top.

  Referring to FIG. 2, a bottom plate 10 a is attached to the bottom of the cylindrical casing body 10, and an upper plate 10 b is attached to the top of the casing body 10, and an annular drive coil is provided inside the casing body 10. The motor which consists of 21 and the rotor 22 is incorporated. In addition, a sleeve 13 made of a non-magnetic material is attached to the casing body 10, the drive coil 21 is installed outside the sleeve 13, and the rotor 22 is arranged inside the sleeve 13. The rotor 22 is supported so as to rotate about the rotor shaft 23. This motor is a stepping motor, and when a drive pulse is supplied to the drive coil, the rotor 22 and the rotor shaft 23 rotate by an angle corresponding to the number of supplied pulses. If the supply of pulses is stopped, the rotor 22 and the rotor shaft 23 stop and self-hold in this state, and if a pulse having an antiphase is supplied, the rotor 22 and the rotor shaft 23 rotate backward by an angle corresponding to the number of pulses.

  As shown in FIG. 3, a protrusion 14 b that functions as a double-sided stopper is formed on the lower plate 14 of the bearing plate that rotatably holds the rotor shaft 23 up and down, and is formed on the rotor shaft 23. When the protrusion 24 rotates until it comes into contact with the protrusion 14b, the rotor shaft 23 and the rotor 22 cannot rotate any further. Accordingly, in this embodiment, the rotor shaft 23 reciprocates in a range slightly narrower than 360 degrees. The plate 14 was formed with a through window 14a so that gas could pass.

  An inflow portion 11 is formed in the bottom plate 10a, and gas flowing into the casing body 10 from the inflow portion 11 flows upward through the inside of the rotor 22, and flows out from the outflow portion 12 formed in the upper plate 10b. To do. In the present embodiment, the rotating plate 3 that functions as a flow rate adjusting unit is attached to the upper end of the rotor shaft 23.

  As shown in FIG. 4, the rotary plate 3 is formed with five through holes 31 having different sizes. If the rotating plate 3 is in the phase shown in FIG. 5A, none of the through holes 31 coincide with the outflow portion 12, so the outflow portion 12 is closed by the rotating plate 3, and no gas flows out from the outflow portion 12.

  When the rotor shaft 23 is rotated and the rotating plate 3 is rotated clockwise in the figure, only one smallest through-hole 31 coincides with the outflow portion 12 in the phase shown in FIG. This state is the minimum flow rate state, and the gas with the minimum flow rate flows out from the outflow portion 12. When the rotor shaft 23 is further rotated, the number of through-holes 31 that coincide with the outflow portion 12 increases, and the gas flowing out from the outflow portion 12 increases stepwise until the maximum flow rate state shown in FIG. If the maximum flow rate state shown in (c) is reached, it is not necessary to rotate the rotor shaft 23 any further, so it is stopped. In order to reduce the flow rate of outflow, the rotating plate 3 is reversed to change the state shown in (c) to the state shown in (b), and when the outflow of gas is further stopped, the rotating plate 3 is further reversed. (A). When a drive unit (not shown) for supplying drive pulses to the drive coil 21 runs away and continues to rotate the rotor shaft 23 in the forward direction, the protrusion 24 of the rotor shaft 23 comes into contact with the protrusion 14b on the plate side. Therefore, further rotation is restricted. In this state, the rotating plate 3 is in the phase shown in FIG. 4D, and none of the through holes 31 coincides with the outflow portion 12, so that the outflow of gas is stopped.

  In the embodiment shown in FIGS. 1 to 4, the flow rate is adjusted by the plurality of through holes 31 formed in the rotating plate 3, so that the change in the flow rate changes stepwise. Depending on the type of gas appliance, there may be a request to increase or decrease the gas flow rate continuously rather than stepwise. For such a gas appliance, a flow rate adjusting device shown in FIG. 5 may be used.

  In the example shown in FIG. 5, the nozzle 5 functioning as a flow rate adjusting unit is attached to the lower end of the rotor shaft 23. The nozzle 5 is screwed into a screw portion 25 formed at the lower end of the rotor shaft 23. Further, as shown in FIG. 6, since a pair of detents 53 fixed to the nozzle 5 are engaged with the groove 15, when the rotor shaft 23 rotates, the nozzle 5 does not rotate and moves in the vertical direction in the figure. .

  A straight portion 52 is formed on the outer periphery of the tip portion of the nozzle 5, and the straight portion 52 is airtightly engaged with the inflow portion 11. Accordingly, no gas flows between the straight portion 52 and the inflow portion 11 until the nozzle 5 is pulled up and the straight portion 52 comes out of the inflow portion 11. Since the nozzle 5 is formed with an orifice 51 for defining a minimum flow rate, the gas is kept at a minimum flow rate through the orifice 51 until the straight portion 52 is removed from the inflow portion 11. Will flow. When the nozzle 5 is further lifted and the straight part 52 comes out of the inflow part 11, the inflow part 11 opens to the inside of the casing body 10, so that the gas passes between the inflow part 11 and the nozzle 5 and the casing body 10 flows in. The flow rate passing through the inflow portion 11 continuously increases as the nozzle 5 moves away from the inflow portion 11.

  On the other hand, an opening / closing plate 4 was attached to the upper end of the rotor shaft 23 instead of the rotating plate 3. As shown in FIG. 7, the opening / closing plate 4 is formed with one long hole 41 along the rotation direction of the opening / closing plate 4. In the phase shown in FIG. 7A, the long hole 41 does not coincide with the outflow portion 12, so that no gas flows out from the outflow portion 12. When the opening / closing plate 4 is rotated in the clockwise direction in the drawing, the long hole 41 immediately overlaps the outflow portion 12, but in this state, the straight portion 52 of the nozzle 5 has not yet come out of the inflow portion 11. Therefore, the gas with the minimum flow rate that has passed through the orifice portion 51 flows out from the outflow portion 12.

  When the opening / closing plate 4 is further rotated, the nozzle 5 rises with the outflow portion 12 and the long hole 41 being overlapped, so that the flow rate of the gas flowing out from the outflow portion 12 continuously increases. FIG. 7B shows a state where the flow rate is maximized. In order to decrease the flow rate from this state, the rotor shaft 23 may be reversed. Therefore, the state shown in (b) returns to the state shown in (a). However, if runaway occurs as described above and the rotor shaft 23 continues to rotate in the forward direction, the opening / closing plate 4 has the phase shown in (c), and the outflow of gas from the outflow portion 12 is stopped.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

1 Flow Control Device 21 Drive Coil 22 Rotor 11 Inflow Portion 12 Outflow Portion 5 Nozzle 51 Orifice Portion

Claims (3)

  A flow rate that is provided in the middle of the gas passage, includes an inflow portion that allows gas to flow into the casing, and an outflow portion that causes gas to flow out from the casing, and is driven by a motor to increase or decrease the flow rate of the gas that flows out from the outflow portion. In the flow control device having an adjustment portion, the rotor of the motor is disposed in the casing, and the inflow portion and the outflow portion are provided at positions facing each other across the rotor, and the portion where the gas is disposed on the rotor is provided. A flow rate adjusting device configured to pass through, wherein the flow rate adjusting portion is provided in either the inflow portion or the outflow portion.   The flow control device according to claim 1, wherein the flow control unit is provided with a closing function, and the outflow of gas from the outflow unit is stopped by the closing function.   The said flow volume control part is provided in any one of an inflow part and an outflow part, and the closing mechanism which drives the motor and stops the outflow of the gas from an outflow part is provided in the other. Flow control device.

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