JP2008196593A - Flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly durable flow control valve preventing eccentricity of a needle for a long period of time and stably passing an accurate flow rate. <P>SOLUTION: The needle 200 arranged in a flow control pipe 700 for distributing gas fuel 510 by an FCM 800 is advanced and retracted in an axial direction (an X direction). When the needle 200 formed so as to change a cross sectional area is advanced and retracted, a gap between the needle 200 and the flow control pipe 700 is changed so that the flow rate of the gas fuel 510 distributed in the flow control pipe 700 is regulated. Magnetic force acts between the flow control pipe 700 and the needle 200 by a first magnet 310 and a second magnet 320, and an axial core of the needle 200 is adjusted by the magnetic force so as to correspond to an axial core of the flow control pipe 700. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flow rate adjusting valve that is inserted in a pipe and can adjust the flow rate of a gas flowing in the pipe.

  Conventionally, various studies have been conducted on flow rate regulating valves. For example, Patent Document 1 discloses a fuel injection valve that can obtain a particularly uniform spray pattern at the time of pre-lift.

  In the fuel injection valve described in Patent Document 1, a needle valve is provided in the valve hole 3 of the nozzle body so as to be movable up and down. This needle valve has a valve opening pressure in two stages by two springs. It is controlled. A guide for preventing the needle valve from running out is integrally formed on either the outer periphery of the needle valve or the inner periphery of the valve hole of the nozzle body, and the guide and the valve seat surface of the nozzle body are integrally formed. In the meantime, a fuel sump is formed that maintains the pressure of the fuel toward the nozzle holes on the valve seat surface evenly.

  Patent Document 2 discloses a fuel injection nozzle used in a diesel engine or the like.

In the fuel injection nozzle described in Patent Document 2, a cylindrical auxiliary needle guide portion is formed in the vicinity of the seat portion of the nozzle body, and an auxiliary sliding portion that is slidably fitted to the needle valve tip portion is formed. The concentricity is regulated at two positions on the distal end portion and the proximal end side of the needle valve, and a fuel passage along the axial direction is formed on the sliding contact surface between the auxiliary needle guide portion and the auxiliary sliding portion. The part is notched so as not to obstruct the fuel flow.
Japanese Patent Laid-Open No. 04-311671 Japanese Utility Model Publication No. 61-037466

  However, in the fuel injection valve described in Patent Document 1, a guide is provided, and the guide slides with the nozzle body. Therefore, when the guide is worn due to long-term use, the needle valve may run out. .

  Similarly, in the fuel injection nozzle described in Patent Document 2, an auxiliary sliding portion is provided, and the auxiliary sliding portion is configured to slide with the auxiliary needle guide portion. Similarly, when the auxiliary sliding portion is worn due to long-term use, the fuel injection nozzle will run out.

  Here, the point which becomes a problem when center runout occurs will be described. FIG. 9 is a diagram for explaining a case where no shaft runout occurs, and FIG. 10 is a diagram for explaining a case where shaft runout occurs. 9A shows a cross-sectional view of the flow rate adjusting valve, FIG. 9B shows a cross-sectional view taken along line AA of FIG. 9A, and FIG. 10A shows a cross-sectional view of the flow rate adjusting valve. FIG.10 (b) shows the AA cross section of Fig.10 (a).

  As shown in FIGS. 9A and 9B, when the needle 200 coincides with the axial centers of the flow control pipe 700 and the narrow pipe 620, gas flows uniformly. On the other hand, as shown in FIGS. 10A and 10B, when the needle 200 does not coincide with the axial centers of the flow control pipe 700 and the thin pipe 620, the needle 200 is eccentric in the vertical upward direction. As shown in FIG. 10 (a), pressure loss of the fluid occurs in the portion α, and the flow rate decreases. As a result, when the shaft 200 of the needle 200 is shaken, the flow rate varies in the entire flow rate adjusting valve.

  An object of the present invention is to provide a flow rate adjusting valve that has high durability and can prevent the eccentricity of the needle over a long period of time and allows a precise flow rate to pass stably.

(1)
The flow control valve according to the present invention includes a valve body, a pipe enclosing the valve body, and a flow rate of gas flowing through the gap between the valve body and the pipe by moving the valve body disposed in the pipe forward and backward. And a magnetic device that generates a magnetic field between the pipe and the valve body. The magnetic device suppresses the displacement of the valve body by the magnetic force.

  In the flow control valve according to the present invention, the valve body disposed in the pipe is moved forward and backward by the driving means to adjust the flow rate of the gas flowing through the gap between the valve body and the pipe. Moreover, a magnetic field is generated between the pipe and the valve body by the magnetic device, and the displacement of the valve body is suppressed by the magnetic force.

  In this case, the shaft shake can be prevented by supporting the shaft shake of the valve body, which occurs during the advance / retreat operation of the valve body, by the magnetic force. As a result, the gap between the valve body and the pipe can be changed stably. Further, by using magnetic force, a highly durable flow control valve can be manufactured without being affected by friction or wear.

(2)
The valve body may be formed such that a cross-sectional area of a cross section perpendicular to the advance / retreat direction of the valve body changes in the advance / retreat direction of the valve body.

  In this case, the flow rate of the gas can be adjusted by the valve body moving forward and backward.

(3)
The valve body has a circumferential portion, the pipe has a circular inner peripheral surface, and the magnetic device connects the center of the circumferential portion of the valve body and the center of the circular inner peripheral surface of the pipe. You may adjust so that an ellipse may become parallel to the advancing / retreating direction of a valve body.

  In this case, since the magnetic device is adjusted so as to connect the center of the circumferential part of the valve body and the center of the inner peripheral surface of the pipe, the shaft shake of the valve body that occurs during the forward and backward movement of the valve body It is possible to prevent the shaft from shaking by supporting.

(4)
The gas may consist of gaseous fuel.

  In this case, a flow control valve can be applied as fuel control in the gas heat pump. As a result, the durability is high, and the gas fuel can be accurately adjusted and distributed.

(5)
The magnetic device may comprise a permanent magnet.

  In this case, since the magnetic device is made of a permanent magnet, the flow control valve can be manufactured at low cost. Further, by using a permanent magnet, it is possible to manufacture a flow control valve that prevents shaft runout, has an accurate flow rate, and has high durability.

(6)
The magnetic device includes a first magnet and a second magnet, and a second magnet is disposed so as to generate a magnetic force with respect to the shaft from at least three directions in a cross section perpendicular to the longitudinal axis of the pipe, and the needle A first magnet may be provided in the cross section so as to generate a repulsive force between magnetic forces acting from three directions in a cross section perpendicular to the longitudinal axis.

  In this case, a magnetic force is generated with respect to the shaft from at least three directions by the second magnet provided in the pipe, and the first magnet is provided on the needle so that a repulsive force acts on the magnetic force. As a result, repulsive force acts between at least three directions between the second magnet and the first magnet, and the needle core is adjusted so as to coincide with the pipe core. Therefore, it is possible to provide a flow rate control valve that prevents shaft runout during the advance and retreat operation of the needle, has an accurate flow rate, and has high durability.

(7)
The magnetic device includes a first magnet and a second magnet. In a cross section perpendicular to the longitudinal axis of the pipe, an annular second magnet is disposed in the pipe, and a repulsive force is generated between the second magnet and the magnet. As described above, an annular first magnet may be disposed on the outer peripheral surface of the needle.

  In this case, since the first magnet and the second magnet are annular magnets, it is not necessary to adjust the detailed mounting position of the magnetic device. In addition, since repulsive force is generated on the entire circumferential surface of the annular first magnet and the annular second magnet, the axis of the needle and the axis of the pipe can be easily matched. As a result, it is possible to provide a flow control valve that is low in cost, prevents shaft runout, has an accurate flow rate, and has high durability.

(8)
The magnetic device includes a third magnet disposed on the needle shaft and on the distal end side in the advance direction of the needle, and an extension of the shaft of the pipe and a first magnet disposed on the pipe in the advance direction. 4 magnets, and the third magnet and the fourth magnet may be provided so that attractive force acts between the third magnet and the fourth magnet.

  In this case, since the attractive force is provided between the third magnet and the fourth magnet, the needle core is adjusted so as to coincide with the axial extension portion of the needle in the pipe. Therefore, it is possible to provide a flow rate control valve that prevents shaft runout during the advance / retreat operation of the needle, has an accurate gas flow rate, and has high durability. Further, the pipe may be bent and the fourth magnet may be arranged outside the pipe, or the fourth magnet may be arranged inside the pipe so as not to cause gas turbulence.

Embodiments according to the present invention will be described below. In the present embodiment, a case where the flow regulating valve according to the present invention is applied to a fuel valve used in a gas heat pump will be described.
(One embodiment)

  FIG. 1 is a schematic diagram showing an example of the structure of a fuel valve 100 according to an embodiment of the present invention.

  As shown in FIG. 1, the fuel valve 100 includes a needle 200, a first magnet 310, a second magnet 320, a fuel supply pipe 400, an air pipe 600, a narrow pipe 620, a flow rate control pipe 700, and an FCM (fuel control motor) 800. including. The needle 200 includes a needle tip portion 210 and a shaft portion 220. Further, the air pipe 600 has a venturi structure 610.

  In the fuel valve 100 of FIG. 1, the gas fuel 510 is supplied into the fuel supply pipe 400. At the same time, air 500 is supplied through the air pipe 600.

  The FCM 800 drives a built-in motor to move the shaft portion 220 forward and backward in the direction of arrow X. Thereby, the needle tip portion 210 of the needle 200 formed in a conical shape moves back and forth in the direction of the arrow X. Further, the flow control pipe 700 is formed so as to enclose the needle tip portion 210 and is connected to the narrow pipe 620.

  Further, as will be described later, a first magnet 310 is disposed at the needle tip portion 210, and a second magnet 320 is disposed at the flow rate control pipe 700. In this case, as will be described later, a repulsive force is generated between the first magnet 310 and the second magnet 320, and the needle tip 210 moves forward and backward along the central axis of the flow control pipe 700.

  The gas fuel 510 is supplied from a narrow pipe 620 to a venturi structure 610 formed in an air pipe 600 through a gap formed between the needle tip portion 210 and the flow rate control pipe 700. Here, the gas fuel 510 is mixed with the air 500 flowing through the air pipe 600 by the action of the venturi structure 610.

  Next, FIG. 2 is a schematic perspective view showing an example of the relationship between the needle 200 and the flow rate control piping 700.

  As shown in FIG. 2, the first magnet 310 has an annular shape and is embedded in the tip of the needle tip portion 210. The second magnet 320 has an annular shape larger than that of the first magnet, and is provided outside the flow control pipe 700.

  Next, FIGS. 3 and 4 are schematic cross-sectional views showing an example of the operation of the fuel valve 100.

  As shown in FIG. 3, the first magnet 310 embedded in the tip of the needle tip 210 is made of a permanent magnet, and consists of an N pole 311 and an S pole 312. The second magnet 320 provided outside the flow control pipe 700 is a permanent magnet, and includes an S pole 321 and an N pole 322.

  As shown in FIG. 3, the S pole 312 of the first magnet 310 and the S pole 321 of the second magnet face each other to generate a repulsive force F.

  Subsequently, as shown in FIG. 4, even when the needle tip 210 is moved in the X direction (advancing direction) by the FCM 800, the S pole 312 of the first magnet 310 and the S pole 321 of the second magnet face each other. Continue to generate repulsive force F. That is, the first magnet 310 and the second magnet 320 are provided so as to have a width that can be opposed to each other at least a distance that the needle tip portion 210 moves forward and backward in the direction of the arrow X. Thereby, the S pole 312 of the first magnet 310 and the S pole 321 of the second magnet always face each other, and a repulsive force F is generated.

  Next, FIG. 5 is a schematic diagram showing the relationship between the first magnet and the second magnet in a cross section perpendicular to the arrow X direction.

  As shown in FIG. 5, the N pole 311 is provided inside the first magnet 310, and the S pole 312 is provided outside the first magnet 310. In addition, an S pole 321 is provided inside the second magnet 320, and an N pole 322 is provided outside the second magnet 320. Thereby, a repulsive force F is generated between the S pole 312 and the S pole 321, and the repulsive force F acts so that the center of the second magnet 320 and the center of the first magnet 310 are in the same position. As a result, the needle tip 210 moves forward and backward along the axial center of the flow control pipe 700.

(Other examples)
FIG. 6 is a schematic cross-sectional view showing another example of the fuel valve 100.

  A fuel valve 100 a shown in FIG. 6 includes a needle tip portion 210 a instead of the needle tip portion 210 of the fuel valve 100. The needle tip 210a includes a columnar needle protrusion 230 at the tip of the needle tip 210a.

  An annular first magnet 310 a is provided on the needle protrusion 230. As shown in FIG. 6, an N pole 311a and an S pole 312a are formed on the needle protrusion 230 of the first magnet 310a, and an S pole 321a and an N pole 322a are formed outside the flow control pipe 700. . Thereby, a repulsive force F is generated between the S pole 312a and the S pole 321a, and the repulsive force F acts so that the center of the second magnet 320a and the center of the first magnet 310a are at the same position. As a result, the needle tip portion 210 a moves forward and backward along the axis of the flow control pipe 700.

(Still other examples)
FIG. 7 is a schematic cross-sectional view showing still another example of the fuel valves 100 and 100a.

  The fuel valve 100b shown in FIG. 7 is provided with three first magnets 310b instead of the annular first magnet 310 of the needle tip portion 210. Each of the three first magnets 310b includes an N pole 311b and an S pole 312b. An S pole 321b and an N pole 322b are formed outside the flow control pipe 700.

  Thereby, repulsive force F is generated between the S pole 312b and the S pole 321b, respectively, so that the centers of the three second magnets 320b and the centers of the three first magnets 310b are in the same position. Act. As a result, the needle tip 210 moves forward and backward along the axial center of the flow control pipe 700.

(Still other examples)
FIG. 8 is a schematic cross-sectional view showing still another example of the fuel valves 100, 100a, 100b.

  The fuel valve 100c shown in FIG. 8 is provided with a third magnet 310c instead of the annular first magnet 310 at the needle tip 210. Unlike the first magnet 310, the third magnet 310c is not provided with different polarities in the cross-sectional direction, but is provided with an N pole 311c and an S pole 312c with respect to the advancing / retreating direction of the needle tip portion 210. In addition, a fourth magnet 320 c is provided on the extension shaft of the needle tip portion 210 outside the flow control pipe 700. The fourth magnet is provided with an S pole 321c on the flow control piping 700 side and an N pole 322c on the opposite side.

  Accordingly, an attractive force F is generated between the N pole 311c and the S pole 321c, and the attractive force F acts so that the center of the third magnet 310c and the center of the fourth magnet 320c are at the same position. As a result, the needle tip portion 210 a moves forward and backward along the axis of the flow control pipe 700.

  In the present embodiment, in the first to fourth magnets, the repulsive force is generated between the S poles and the attractive force is generated between the N pole and the S pole. However, the present invention is not limited to this. In addition, repulsive force may be generated between the N poles, and not only a permanent magnet but also an electromagnet or another magnetic device may be provided. Further, it is assumed that the attractive force F in the third and fourth magnets is smaller than the force of the advancing / retreating operation by the FCM 800.

  Furthermore, in the present embodiment, a magnetic device is newly provided. However, the needle and the pipe itself may have the function of the magnetic device. For example, the pipe may be formed with a permanent magnet and the needle may be made with a permanent magnet.

  As described above, in the fuel valves 100, 100a, 100b, and 100c in the present embodiment, the shaft runout can be prevented by supporting the shaft runout of the needle 200 that occurs during the advance / retreat operation of the needle 200 with a magnetic force. As a result, the gap between the needle 200 and the flow rate control pipe 700 can be changed stably, and the flow rate of the gas fuel 510 can be accurately adjusted by the FCM 800. Further, by using the magnetic force, it is possible to manufacture the highly durable fuel valves 100, 100a, 100b, and 100c without being affected by friction or wear.

  Moreover, since the 1st magnet 310, the 2nd magnet 320, the 3rd magnet 310ac, and the 4th magnet 320c consist of permanent magnets, the fuel valves 100, 100a, 100b, 100c can be manufactured at low cost. Further, by using a permanent magnet, it is possible to manufacture a flow control valve that prevents shaft runout, has an accurate flow rate, and has high durability.

  The second magnet 320 provided in the flow control pipe 700 generates a magnetic force with respect to the shaft from at least three directions, and the needle 200 is provided with the first magnet 310 so that a repulsive force acts on the magnetic force. As a result, repulsive force acts between the second magnet 320 and the first magnet 310 from at least three directions, and the axis of the needle 200 is adjusted so as to coincide with the axis of the flow rate control pipe 700. Shaking during operation can be prevented, and the gas flow rate can be supplied accurately and stably.

  When the first magnet 310 and the second magnet 320 are annular magnets, it is not necessary to adjust the detailed mounting positions of the first magnet 310 and the second magnet 320. In addition, since repulsive force is generated on the entire circumferential surface of the annular first magnet 310 and the annular second magnet 320, the axis of the needle 200 and the axis of the flow control pipe 700 can be easily matched. Thus, the flow rate of the gas fuel 510 can be adjusted accurately and stably at a low cost.

  In addition, since the third magnet 310c and the fourth magnet 320c are provided so as to be attracted to each other, the axial center of the needle 200 coincides with the axial extension portion of the needle 200 in the flow control pipe 700. Adjusted. As a result, it is possible to prevent the shaft shake during the advance / retreat operation of the needle 200 and to supply the gas flow rate accurately and stably.

  In the above embodiment, the needle 200 corresponds to the needle, the flow control pipe 700 corresponds to the pipe, the FCM (fuel control motor) 800 corresponds to the driving means, the first magnet 310, the second magnet 320, The third magnet 310c and the fourth magnet 320c correspond to a magnetic device, the fuel valves 100, 100a, 100b, and 100c correspond to flow control valves, the gas fuel 510 corresponds to gas fuel, the first magnet 310, the second magnet The magnet 320, the third magnet 310c, and the fourth magnet 320c correspond to permanent magnets, the first magnet 310 corresponds to the first magnet, the second magnet 320 corresponds to the second magnet, and the third magnet 310c corresponds to the third magnet. It corresponds to a magnet, and the fourth magnet 320c corresponds to a fourth magnet.

  Although the present invention has been described in the above-described preferred embodiment, the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

The schematic diagram which shows an example of the structure of the fuel valve which concerns on one embodiment which concerns on this invention Schematic perspective view showing an example of the relationship between the needle and the flow rate control piping Schematic sectional view showing an example of the operation of the fuel valve Schematic sectional view showing an example of the operation of the fuel valve The schematic diagram which shows the relationship between a 1st magnet and a 2nd magnet in the cross section perpendicular | vertical to the arrow X direction. Schematic sectional view showing another example of fuel valve Schematic sectional view showing still another example of the fuel valve Schematic sectional view showing still another example of the fuel valve Diagram for explaining the case where there is no shaft runout Diagram for explaining the case of shaft runout

Explanation of symbols

100, 100a, 100b, 100c Fuel valve 200 Needle 310 First magnet 310c Third magnet 320 Second magnet 320c Fourth magnet 510 Gas fuel 700 Flow control piping 800 FCM (Fuel control motor)

Claims (8)

The disc,
Piping for enclosing the valve body;
Drive means for adjusting the flow rate of the gas flowing through the gap between the valve body and the pipe by moving the valve body disposed in the pipe forward and backward;
A magnetic device for generating a magnetic field between the pipe and the valve body,
The flow rate control valve, wherein the magnetic device suppresses a displacement of the valve body by the magnetic force.   2. The flow control valve according to claim 1, wherein the valve body is formed such that a cross-sectional area of a cross section perpendicular to the advance / retreat direction of the valve body changes in the advance / retreat direction of the valve body. The valve body has a circumferential portion,
The pipe has a circular inner peripheral surface,
The magnetic device is characterized in that a line connecting a center of a circumferential portion of the valve body and a center of a circular inner peripheral surface of the pipe is adjusted to be parallel to the advancing and retreating direction of the valve body. The flow control valve according to claim 1 or 2.   The flow rate control valve according to any one of claims 1 to 3, wherein the gas is made of gaseous fuel.   The flow control valve according to any one of claims 1 to 4, wherein the magnetic device is formed of a permanent magnet. The magnetic device includes a first magnet and a second magnet,
The second magnet is disposed so as to generate a magnetic force with respect to the shaft from at least three directions in a cross section perpendicular to the longitudinal axis of the pipe;
The first magnet is provided in the cross section so as to generate a repulsive force between magnetic forces acting from the three directions in a cross section perpendicular to the longitudinal axis of the needle. The flow control valve according to any one of 5. The magnetic device includes a first magnet and a second magnet,
In a cross section perpendicular to the longitudinal axis of the pipe, the second magnet having an annular shape is disposed in the pipe,
The said 1st magnet which consists of an annular | circular shape is arrange | positioned on the outer peripheral surface of the said needle | hook so that a repulsive force may generate | occur | produce between the said 2nd magnet, The any one of Claim 1-6 characterized by the above-mentioned. The flow control valve described in 1. The magnetic device is:
A third magnet disposed on the tip of the needle in the advance direction of the advance and retreat direction of the needle;
A fourth magnet disposed on the pipe on the extension of the axis of the needle and in the advance direction,
8. The method according to claim 1, wherein the third magnet and the fourth magnet are provided so that an attractive force acts between the third magnet and the fourth magnet. 9. The flow control valve described.

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