JP5693522B2 - Solenoid proportional valve - Google Patents

Description

  The present invention relates to an electromagnetic proportional valve including a governor mechanism that receives a primary pressure with a diaphragm and adjusts the position of a valve body to stabilize the flow rate even when the primary pressure changes.

  As this type of conventional electromagnetic proportional valve, a valve composed of a manifold portion and a solenoid portion is known. The manifold portion is provided with a gas passage and a valve opening in the middle of the gas passage, and further, a valve body for adjusting the opening degree of the valve opening is provided. On the other hand, the solenoid portion is provided with a plunger that advances and retreats by the magnetic force generated by the solenoid coil, and is configured to drive the valve body by this plunger.

  With the above configuration, the flow rate of the gas in the gas passage can be adjusted by moving the valve body by moving the plunger back and forth and increasing or decreasing the opening of the valve port. However, when the pressure on the primary side upstream of the valve port fluctuates, the flow rate changes even if the opening of the valve port is constant. That is, even if the opening degree of the valve port is constant, if the primary pressure increases, the flow rate of gas passing through the valve port increases. Conversely, if the primary pressure decreases, the flow rate of gas passing through the valve port increases. Decrease.

  In order to prevent such a change in the gas flow rate due to the fluctuation of the primary pressure, a diaphragm having a governor mechanism in which a diaphragm that isolates the primary side from the outside is provided and a valve body is connected to the diaphragm is known. (For example, refer to Patent Document 1). When the primary pressure increases, the diaphragm swells in the external direction. By the configuration, the valve body moves in the direction of narrowing the opening of the valve port by the swell, so that when the primary pressure increases, the valve port automatically The opening degree can be narrowed so that the flow rate of the gas passing through the valve port does not change. Conversely, if the primary pressure decreases, the diaphragm will be dented to the primary side, but by moving the valve body in the direction in which the opening of the valve port increases due to the depression, the flow rate will decrease even if the primary pressure decreases. Is held constant.

  However, when a water heater or the like in which such an electromagnetic proportional valve is installed is installed indoors, when the ventilation fan is operated, the indoor pressure decreases, and the diaphragm may expand outward. If the diaphragm bulges outward even though the primary pressure has not changed, the gas flow rate will inadvertently decrease, and in the worst case, the operation of the hot water supply device or the like will stop.

  Therefore, the outside of the diaphragm is covered with a base plate, and a space sandwiched between the diaphragm and the base plate is communicated with a combustion chamber or the like. The combustion chamber is a space into which combustion air is forcibly sent by a blower fan, and the pressure in the combustion chamber hardly fluctuates during combustion even if the external air pressure fluctuates. For this reason, the pressure outside the diaphragm is kept constant without being subjected to fluctuations in atmospheric pressure.

  In order to communicate the space sandwiched between the diaphragm and the base plate to the combustion chamber or the like, it is necessary to connect a communication tube. For this reason, a communication member for attaching a small hole to the base plate and communicating the small hole to the outside of the electromagnetic proportional valve is attached.

Japanese Patent Laid-Open No. 11-125419 (paragraph 0023, FIG. 3)

  Since the communication member connects the tube, the tip must protrude to some extent. And a tube is connected in the state which incorporated the electromagnetic proportional valve in apparatuses, such as a hot-water supply apparatus. For this reason, when the electromagnetic proportional valve is installed in the device, the tip of the communication member collides with other parts in the device, or when performing other installation work with the electromagnetic proportional valve installed, tools etc. There is a possibility that the position of the communication member may be shifted when hitting the tip.

  When the communication member is displaced, the communication state between the space between the diaphragm and the base plate and the communication member becomes incomplete, which causes a malfunction of the device. In order not to cause such malfunction of the device, the communication member may be firmly held so that the position of the communication member does not shift even if a slight impact is applied to the tip of the communication member. If a structure such as screwing to the base plate is employed, the number of assembling steps of the electromagnetic proportional valve increases, which is not desirable.

  Then, this invention makes it a subject to provide the electromagnetic proportional valve which can hold | maintain a communicating member firmly, without increasing an assembly man-hour in view of said problem.

In order to solve the above problems, an electromagnetic proportional valve according to the present invention includes a gas passage and a valve port formed in the middle of the gas passage, and the gas passage is formed by increasing or decreasing the opening of the valve port by a valve body. A manifold part in which the flow rate of the flowing gas is adjusted, a solenoid part attached to the manifold part to increase or decrease the opening degree of the valve port by adjusting the position of the valve body, and a primary that is upstream of the valve port An electromagnetic proportional valve comprising: a diaphragm that receives the pressure of the chamber and biases the valve body toward the valve closing side; and a base plate that covers the diaphragm from the outside and to which the solenoid unit is fixed. A small hole is formed that communicates with the space between the plate and the diaphragm, and a communication member that communicates the small hole to the outside of the portion where the solenoid portion and the base plate are joined is provided. Engages in a groove formed in the communicating member while sandwiching the communicating member by the base plate to secure the communicating member, the fixing portion for opening the base plate side, characterized in that provided in the solenoid portion.

  Since the fixing portion for fixing the communication member by engaging with the communication member is provided in the solenoid portion, the communication member can be used without fixing screws for fixing the communication member when fixing the solenoid portion to the base plate. Can be fixed.

Note that, specifically, the fixed portion which is open to the base plate side is semicircular, communication member by communicating member solenoid portion in a state attached to the manifold portion is sandwiched between the base plate and the fixed portion It is desirable to be fixed.

  As is clear from the above description, in the present invention, since the solenoid portion is provided with a fixing portion that engages with the communication member and fixes the communication member, the communication member is fixed without using a separate fixing screw or the like. can do.

Perspective view showing the external shape of the solenoid proportional valve II-II cross section The perspective view which shows the external shape of the solenoid part of the state fixed to the base plate Exploded perspective view of base plate and solenoid part Diagram showing the shape of the communication member

  Referring to FIG. 1, 1 is an example of an electromagnetic proportional valve according to the present invention. The electromagnetic proportional valve 1 is connected to an on-off valve V upstream. 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. The electromagnetic 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 rises, 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 the solenoid portion 2 is fixed to the base plate 5 by caulking with 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 7 that is held between the solenoid portion 2 and the base plate 5 is attached to the small hole 52. Therefore, the back pressure chamber 51 communicates with the outside via the communication member 7. A tube (not shown) is connected to the communication member 7, 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 7 is configured to be sandwiched and fixed between the magnetic path plate 6 and the base plate 5 when the magnetic path plate 6 that is a part of the solenoid unit 2 is caulked and fixed to the base plate 5. Has been. For this fixing, a semicircular fixing portion 62 that opens toward the base plate 5 is formed on the magnetic path plate 6.

  As shown in FIG. 5, the communication member 7 is formed with a pair of flange portions 71, 72, and the fixing portion 62 is configured to fit into a valley portion 73 sandwiched between the flange portions 71, 72. With this configuration, when the magnetic path plate 6 is attached to the base plate 5, the communication member 7 is fixed by the fixing portion 62 simply by setting the communication member 7 to the fixing portion 62. And if it fixes in this way, even if the external force of any direction of the X, Y, Z direction shown in FIG. 5 acts on the front-end | tip of the communication member 7, the position of the communication member 7 will not shift | deviate. Reference numeral 70 denotes a sealing O-ring.

  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.

DESCRIPTION OF SYMBOLS 1 Solenoid proportional valve 2 Solenoid part 3 Manifold part 4 Diaphragm 5 Base board 6 Magnetic path board 7 Communication member 32 Valve port 34 Valve body 51 Back pressure chamber 52 Small hole 62 Fixed part

Claims (2)

A manifold portion having a gas passage and a valve port formed in the middle of the gas passage, the flow rate of the gas flowing through the gas passage being increased or decreased by increasing or decreasing the opening degree of the valve port by the valve body, and the manifold A solenoid part that is attached to the valve and adjusts the position of the valve body to increase or decrease the opening of the valve port, and receives the pressure in the primary chamber upstream of the valve port to urge the valve body toward the valve closing side In the electromagnetic proportional valve having a diaphragm that covers the diaphragm from the outside and a base plate to which the solenoid portion is fixed, a small hole that communicates with a space sandwiched between the base plate and the diaphragm is formed in the base plate and, provided with a communicating member for communicating the small hole on the outside of the mating portion between the solenoid portion and the base plate, to the communicating member while sandwiching the communicating member by the solenoid portion and the base plate Forms were engage to secure the communication member into the groove, the electromagnetic proportional valve a fixing section that is open on the base plate side, characterized in that provided in the solenoid portion. Fixing part which is open to the base plate side is semicircular, and so that the communication member is fixed by communicating member solenoid portion in a state attached to the manifold portion is sandwiched between the base plate and the fixed portion The electromagnetic proportional valve according to claim 1.

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