JP5566416B2 - Gas proportional valve - Google Patents

Description

  The present invention relates to, for example, a gas proportional valve that is incorporated in a hot water supply device to increase or decrease the flow rate of gas to a gas burner and has a governor function by a diaphragm.

  This type of conventional gas proportional valve variably adjusts the amount of gas passing through the valve port formed in the gas passage by moving the valve body forward and backward toward the valve port. The valve body is provided on the valve shaft, and the valve shaft is fixed to the center of the diaphragm. The diaphragm is provided between the primary chamber upstream of the valve port and the outside so as to isolate both. Therefore, when the pressure in the primary chamber, that is, the primary pressure changes to the high pressure side, the diaphragm swells to the outside. Since the valve shaft is fixed to the diaphragm, the valve shaft also moves when the diaphragm expands. As a result, the valve body provided on the valve shaft approaches the valve opening and narrows the opening of the valve opening. Therefore, even if the primary pressure increases, the gas flow rate to the secondary chamber downstream of the valve opening is reduced. Does not fluctuate. Conversely, when the primary pressure decreases, the diaphragm is displaced to the primary chamber side, and the valve body is separated from the valve port via the valve shaft to increase the opening of the valve port. Does not fluctuate.

  Thus, the valve body is floated so as to have a constant flow rate. In this state, when the valve shaft is urged with a separate urging force, the floating position changes, and the flow rate to the secondary chamber changes. And the flow volume after the change is kept constant. A governor mechanism is a mechanism that operates so that the flow rate to the secondary chamber does not vary even when the primary pressure varies.

  If the valve shaft is energized by using a plunger mechanism as a separate energizing force, the energizing force to the solenoid coil constituting the plunger mechanism is increased or decreased to increase or decrease the energizing force to the valve shaft. The position of the gas can be changed to increase or decrease the gas flow rate.

  On the other hand, for example, when a hot water supply device incorporating this gas proportional valve is installed in a room and the pressure in the room changes due to the use of a ventilation fan or the like, the external pressure facing the primary chamber across the diaphragm Changes. Therefore, the amount of gas passing through the valve port varies every time the indoor pressure changes even though the primary pressure does not vary, which is not desirable.

  Therefore, a back pressure chamber is formed by surrounding the diaphragm with a base plate from the outside, and the back pressure chamber is communicated with a place where the pressure fluctuation is relatively small, for example, a downstream position of the combustion blower fan or the combustion chamber, It is configured so that a change in external pressure such as in a room does not act on the diaphragm (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2007-162911 (FIG. 1)

  In the conventional gas proportional valve, a communication portion for communicating the back pressure chamber to the outside is formed at the top of the solenoid portion. Therefore, the height of the solenoid portion is increased, and the space occupied by the entire gas proportional valve is increased, so that the mounting position is limited. In view of this, it is conceivable to reduce the height of the solenoid part by providing the communication part between the diaphragm and the solenoid part.

  On the other hand, the solenoid coil of the solenoid part must be provided with a terminal for energizing from the outside, and a connector must be connected to the terminal. The degree of freedom in mounting the solenoid part is limited. That is, when the gas proportional valve is attached close to the wall portion, the connector can be connected from any one of the three directions avoiding the wall portion, and the tube can be connected to the communication portion. If it does not coincide with the connection direction to the terminal, the posture is restricted so that there is no obstacle in both the connection direction to the terminal and the connection direction to the communication portion.

  Further, the leg portion for fixing the solenoid portion needs to be provided in two directions. However, since the leg portion and the communication portion cannot be provided in the same phase, the two directions in which the leg portion is provided and the terminal and the communication portion are connected. A total of three directions with the connection direction are required. However, the magnetic path plates sandwiching the solenoid coil from both sides need to be connected to each other by magnetic path columns to form a closed magnetic path, but the direction of providing the magnetic path columns remains only in the remaining one direction. However, if the magnetic path column is provided only in one place, the magnetic path area of the magnetic path column cannot be sufficiently secured, and the magnetic force of the solenoid portion is reduced.

  Therefore, in view of the above problems, the present invention provides a gas proportional valve that can sufficiently secure the magnetic path area of the magnetic path column even when the communication portion is provided between the solenoid portion and the diaphragm to reduce the size. The issue is to provide.

  In order to solve the above problems, the gas proportional valve according to the present invention is provided with a diaphragm that isolates the primary chamber located upstream of the valve port to the outside, and the rear end of the valve shaft is held at the center of the diaphragm. The tip of the valve shaft extends through the valve port to the secondary chamber located downstream of the valve port, and a valve body is formed on the valve shaft so as to be positioned in the secondary chamber, and the entire circumference of the diaphragm is externally In the gas proportional valve in which a base plate that forms a back pressure chamber between the diaphragm and the diaphragm and a plunger mechanism that urges the valve shaft toward the secondary chamber is provided on the base plate, the plunger mechanism includes: A magnetic path column having a solenoid coil and a pair of magnetic path plates sandwiching the solenoid coil from both ends, and connecting one magnetic path plate and the other magnetic path plate to each other; A pair of plates that fix the magnetic path plate to the base plate And a communication portion for connecting the back pressure chamber to the outside is provided between the one magnetic path plate and the base plate, and is connected to a terminal for energizing the solenoid coil. The direction and the position of the communication part are set to the same phase, the phase is set as the origin, and the pair of legs are provided at the positions of the left and right 90 ° phases, and sandwiched between the origin and the phase where these legs are provided. The magnetic path column is provided at each position.

  If it is a conventional structure, a terminal can be provided in the phase which provided one leg part, but if a communicating part is provided according to the phase of a terminal, a leg part cannot be provided. Therefore, instead of forming magnetic path pillars in any of the four directions around the solenoid part, the position of the terminal and the position of the communication part are set to the same phase, and the phase is the origin and the 90 ° Each of the pair of leg portions is provided at a position, and the magnetic path columns are separately provided at a position between the origin and the phase where the leg portions are provided. Although the cross-sectional area of one magnetic path column is reduced, two magnetic path columns can be provided, so that a sufficient cross-sectional area can be ensured.

  As an example of a specific configuration of the communication portion, if the communication portion is configured by a small hole formed in the base plate and a communication member that communicates the small hole and the outside, the back pressure chamber is connected to the outside. Making it easier to communicate. At this time, it is conceivable that the communication member is held by being sandwiched between the base plate and the one magnetic path plate.

  In addition, when it is not possible to secure a sufficient cross-sectional area with only these two magnetic path columns, it is necessary to provide additional magnetic path columns. However, if the number of magnetic path columns is increased unnecessarily, the other magnetic path plate When attaching to the magnetic path column, the magnetic path column does not have the same height, and there is a possibility that a gap may be formed between the other magnetic path plate and the magnetic path column. Therefore, if a third magnetic path column is formed at a position 180 degrees phase with respect to the origin and the magnetic path plates are connected to each other by three magnetic path columns, the magnetic path column and the other magnetic field column are connected. There is no gap between the road plate.

  Since a larger magnetic path area is desirable, a wing portion facing the circumferential surface of the solenoid coil is extended from a magnetic path column formed at a position sandwiched between the origin and the 90 ° phase position. It is desired that a magnetic path is formed between the magnetic path plate and the other magnetic path plate so that the magnetic flux flowing through the magnetic path column is increased.

  As is clear from the above description, the present invention can sufficiently secure the magnetic path area of the magnetic path column even when the communication portion is provided between the solenoid portion and the diaphragm to reduce the size. The height of the part can be lowered, and the gas proportional valve can be miniaturized.

The figure which shows the structure of one embodiment of this invention II-II sectional view Perspective view of solenoid part Disassembled perspective view of solenoid part The perspective view of the solenoid part in 2nd Embodiment

  Referring to FIG. 1, 1 is an example of a gas proportional valve according to the present invention. The gas proportional valve 1 is connected to an on-off valve V upstream, and when the on-off valve V is opened, the flow rate of the gas passing through the on-off valve V is adjusted and supplied to a downstream gas burner (not shown). is there. This gas proportional valve 1 includes a solenoid part 2 and a manifold part 3.

  With reference to FIG. 2, the manifold 31 which comprises the manifold part 3 is formed by the aluminum die-casting, and the valve port 32 used as the gas channel | path is formed in the inside. A primary chamber 301 is formed upstream of the valve port 32, and a secondary chamber 302 is formed downstream. Accordingly, when the on-off valve V is opened, gas flows from the primary chamber 301 to the secondary chamber 302. However, a valve shaft 33 penetrating the valve port 32 from the primary chamber 301 side to the secondary chamber 302 is provided, and the valve shaft 33 is located on the tip side, that is, in the portion located in the secondary chamber 302. A valve body 34 is formed integrally with the valve shaft 33.

  When the valve shaft 33 moves backward to the primary chamber 301 side, the valve element 34 narrows the opening area of the valve port 32, so that the flow rate of gas passing through the valve port 32 decreases. On the contrary, when the valve shaft 33 moves forward to the secondary chamber 302 side, the valve element 34 is separated from the valve port 32 and the opening area of the valve port 32 is expanded, so that the gas flow rate increases.

  The rear end portion of the valve shaft 33 is attached to the central portion of the diaphragm 4. The diaphragm 4 is attached so as to isolate the primary chamber 301 from the outside. Therefore, the pressure in the primary chamber 301, that is, the primary pressure acts on the inner surface of the diaphragm 4. Therefore, when the primary pressure suddenly increases, the diaphragm 4 expands outward, and as a result, the valve shaft 33 is moved downward in FIG.

  If the primary pressure increases, the flow rate of the gas passing through the valve port 32 also increases. However, since the valve shaft 34 approaches the valve port 32 and narrows the opening area by moving the valve shaft 33 in this way, the flow rate is reduced. As a result, the amount of gas flowing into the secondary chamber 302 is kept constant. Conversely, when the primary pressure decreases, the diaphragm 4 is displaced toward the primary chamber 301 and the valve element 34 is moved away from the valve port 32 to increase the opening area of the valve port 32. Therefore, the gas flow rate is also constant. To be kept. However, in this state, the gas flow rate is only kept constant, and the flow rate cannot be increased or decreased.

  Therefore, the valve shaft 33 is urged upward in FIG. 2 by the solenoid unit 2, and the position where the valve body 34 is balanced is changed by increasing or decreasing the urging force so that the gas flow rate can be adjusted.

  The configuration of the solenoid unit 2 will be described with reference to FIG. 2 in addition to FIG. 3 and FIG. 3 and 4 show the posture of the solenoid unit 2 shown in FIG. 2 upside down. The solenoid unit 2 includes a solenoid coil 21 wound around a hollow bobbin 22. The bobbin 22 is sandwiched between two magnetic path plates 6 and 61 from the vertical direction. A pair of leg portions 60 project from one magnetic path plate 6 and are fixed to the base plate 5 by the leg portions 60. The base plate 5 fixes the diaphragm by pressing the entire circumference of the diaphragm 4, and is fixed to the manifold 31 with four screws.

  When the base plate 5 fixes the diaphragm 4, a back pressure chamber 51 is formed between the diaphragm 4 and the base plate 5. A small hole 52 is formed in the base plate 5, and a communication member 53 is attached to the small hole 52. Therefore, the back pressure chamber 51 communicates with the outside via the communication member 53. A tube (not shown) is connected to the communication member 53, and the tip of the tube is connected to the downstream side of the blower fan or the combustion chamber. In order to efficiently transfer magnetic flux between the magnetic path plate 61 and the plunger 23, a collar K made of a magnetic material was inserted. Further, a cover member 61a is provided so that dust or the like does not enter the bobbin 22.

  The communication member 53 is configured to be sandwiched and fixed between the magnetic path plate 6 and the base plate 5 when the magnetic path plate 6 is fixed to the base plate 5. The solenoid coil 21 is provided with a terminal 25 to which a connector (not shown) is connected. As shown in FIG. 3, the phase of the mounting portion of the communication member 53 and the phase of the terminal 25 are set to coincide with each other. .

  Three magnetic path columns 62, 63, 64 extending from the magnetic path plate 6 toward the other magnetic path plate 61 are formed by pressing. The phase at which the terminal 25 and the communication member 53 are provided is 0 degree (origin), and the leg portion 60 is formed at a phase position of 90 degrees on the left and right. Of the three magnetic path pillars, the two magnetic path pillars 62 and 63 are provided at a position with a phase of approximately 45 degrees, that is, between the terminal 25 and the communication member 53 and each leg 60. It was. The remaining magnetic path pillars 64 were provided at 180 ° phase positions.

  Since the magnetic path columns 62 and 63 formed at the 45 degree phase positions are formed obliquely, they do not interfere with the screws for fixing the base plate 5 to the manifold 31. Therefore, the screws for fixing the base plate 5 The interval can be reduced. The magnetic path columns 62 and 63 have a smaller cross-sectional area than the magnetic path column 64, but the total cross-sectional area of the two magnetic path columns 62 and 63 is set wider than the cross-sectional area of the magnetic path column 64 alone. Therefore, a sufficient cross-sectional area can be secured as the magnetic path, and the magnetic path columns 62 and 63 do not saturate the magnetic flux and leak to the outside. Further, by using three magnetic path columns, the magnetic path plate 61 can be fixed to each magnetic path column without creating a gap even if the height of each magnetic path column varies slightly.

  By the way, as described above, a sufficient cross-sectional area of the magnetic path column can be secured, and magnetic saturation does not occur in the magnetic path column, but a slight gap is formed between the magnetic path plate 61 and the magnetic path column. If the gap becomes a magnetic resistance and it is feared that the magnetic flux does not flow between the two, as shown in FIG. 5, the wings 62a and 62b are extended from the magnetic path column 62, and the magnetic Similarly, it is desirable to form a wing portion 63b (the other wing portion is not shown) from the road pillar 63 and increase the magnetic path flowing by increasing the portion facing the magnetic path plate 61. Further, since these wing portions also function as a girth of the solenoid coil 21, when the base plate 5 is screwed to the manifold 31 with the solenoid portion 2 fixed to the base plate 5 in advance, a tool or the like is used for the solenoid coil 21. It is possible to eliminate the risk of accidental hitting and disconnection.

  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. For example, the magnetic path column 63 may be provided separately from the magnetic path plate 6, and the present invention is also applied to a structure that communicates with the outside (atmosphere) without the communication member 53 as a communication portion. Can be applied.

1 Gas proportional valve 2 Solenoid part 3 Manifold part 4 Diaphragm 5 Base plate 6 Magnetic path plate 21 Solenoid coil 32 Valve port 33 Valve shaft 34 Valve body 51 Back pressure chamber 52 Small hole 53 Communication member 60 Leg part 61 Magnetic path plate 62, 63, 64 Magnetic path column V On-off valve

Claims (4)

  A diaphragm that isolates the primary chamber located upstream of the valve port to the outside is provided, the rear end of the valve shaft is held at the center of the diaphragm, and the front end of the valve shaft is positioned downstream of the valve port through the valve port. A base that extends to the secondary chamber and forms a valve body on the valve shaft so as to be positioned in the secondary chamber, and forms a back pressure chamber between the diaphragm and the entire periphery of the diaphragm from the outside. A gas proportional valve in which a plate and a plunger mechanism for urging the valve shaft in the direction of the secondary chamber are provided on the base plate. The plunger mechanism includes a solenoid coil and a pair of magnetic path plates sandwiching the solenoid coil from both ends. A pair of magnetic path pillars interconnecting one magnetic path plate and the other magnetic path plate, and fixing the magnetic path plate to the base plate on the one magnetic path plate Further, the back pressure chamber is communicated to the outside. The portion is provided between the one magnetic path plate and the base plate, and the direction of connection to the terminal for energizing the solenoid coil and the position of the communicating portion are set to the same phase, and the phase is A gas characterized in that the pair of legs are respectively provided at the positions of 90 degrees left and right as the origin, and the magnetic path columns are provided at positions sandwiched between the origin and the phases at which the legs are provided. Proportional valve.   The communication portion is composed of a small hole formed in the base plate and a communication member that communicates the small hole with the outside, and the communication member is sandwiched between the base plate and the one magnetic path plate. The gas proportional valve according to claim 1, wherein the gas proportional valve is held by the valve.   The third magnetic path column is formed at a position 180 degrees phase with respect to the origin, and the both magnetic path plates are connected to each other by three magnetic path columns. Gas proportional valve as described.   A wing portion facing the circumferential surface of the solenoid coil is extended from a magnetic path column formed at a position sandwiched between the origin and the left and right 90-degree phase position, and a magnetic field is formed between this wing portion and the other magnetic path plate. The gas proportional valve according to claim 3, wherein a path is formed to increase a magnetic flux flowing through the magnetic path column.

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