JP7164421B2 - Solenoid proportional valve with governor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a solenoid proportional valve with a governor interposed in a gas supply line or the like for a burner.

Conventionally, as this type of solenoid proportional valve with a governor, the opening of the valve hole is adjusted by adjusting the distance between two pressure regulating chambers communicating with each other through a valve hole in which a valve seat is formed and the valve seat. a governor valve, a diaphragm connected to the governor valve and provided in one of the pressure regulating chambers for receiving the pressure in the one pressure regulating chamber and urging the governor valve to the closing side, and the diaphragm isolated from the one pressure regulating chamber. a demarcated back pressure chamber; an electromagnetic solenoid provided on the side of the back pressure chamber that applies a pressing force proportional to the energized current to the governor valve via a plunger; and a guide sleeve that guides the movement of the inner peripheral portion (see, for example, Patent Document 1).

Further, in the governor-equipped proportional solenoid valve, a small hole communicating with the back pressure chamber is formed in the retainer plate for clamping and fixing the diaphragm to the outer periphery of one of the pressure regulating chambers (primary pressure chamber). there is Further, a communication member is provided that protrudes outward from the mating portion of the electromagnetic solenoid and the pressing plate to open the back pressure chamber to the atmosphere, and the electromagnetic solenoid is provided with a fixing portion that fixes the communication member by engagement. Thus, in the governor-equipped proportional solenoid valve, the communication member can be clamped and fixed by the pressing plate and the fixing portion during assembly.

However, as a result of subsequent investigations, it was found that the fixing of the communicating member by the holding plate and the fixing portion as described above is affected by the dimensional accuracy of the holding plate and the fixing portion, including the communicating member, and rattling occurs during assembly. If the tube is connected to the communicating member without sufficient fixing strength, the communicating member and its surroundings may be deformed due to the external force at that time, and may be damaged due to excessive deformation. A problem was found. In addition, since dedicated parts such as a communicating member and a fixing portion are required to open the back pressure chamber to the atmosphere, it is desirable to simplify the structure and reduce the cost.

JP 2013-249874 A

In view of the above points, the present invention enables production with stable quality without rattling during assembly, and prevents the connected portion and its peripheral portion from being easily deformed and damaged by external force during tube connection. It is an object of the present invention to provide a governor-equipped proportional solenoid valve which is capable of reducing the risk of simplification of the structure and reducing the cost associated therewith.

In order to solve the above problems, the present invention provides two pressure regulating chambers communicated by a valve hole in which a valve seat is formed, and a governor valve that adjusts the opening of the valve hole by adjusting the distance from the valve seat. , a diaphragm that is connected to the governor valve and faces one of the pressure regulating chambers, receives the pressure in the one of the pressure regulating chambers and urges the governor valve to the closed side, and is isolated from the one pressure regulating chamber by the diaphragm. a back pressure chamber, an electromagnetic solenoid provided on the side of the back pressure chamber that applies a pressing force proportional to the energized current to the governor valve via the plunger, and a plunger that communicates with the back pressure chamber and moves inside the electromagnetic solenoid. In a solenoid proportional valve with a governor provided with a guide sleeve that guides the inner peripheral part of the electromagnetic solenoid The projecting portion has a small diameter portion with an outer diameter smaller than that of the body portion, and a back pressure chamber is formed on the end surface of the small diameter portion opposite to the body portion. It is characterized by having an open hole open to the atmosphere.

According to the present invention, the guide sleeve that guides the movement of the plunger at the inner peripheral portion is integrally formed with the main body, and the open hole that opens the back pressure chamber to the atmosphere on the end face opposite to the main body. Since it consists of the protruding portion in which is opened, there is no need for a separate dedicated part or the like for opening the back pressure chamber to the atmosphere. Therefore, it is possible to simplify the structure and reduce the cost associated therewith, and it is possible to produce a governor-equipped solenoid proportional valve of stable quality without the risk of rattling that has occurred during assembly in the past. In addition, since the protruding portion of the guide sleeve becomes the connected portion when connecting the tube, deformation due to the external force applied when connecting the tube is less likely to occur, and the peripheral portion of the protruding portion is less likely to be affected by the external force. Almost none, reducing the risk of breakage.

Further, in the present invention, the protruding portion has a small diameter portion having an outer diameter smaller than that of the main body portion as described above, and an open hole is formed in the end face of the small diameter portion opposite to the main body portion, so that the tube can be The portion to be connected can be a small diameter portion, and a tube having a small inner diameter corresponding to the outer diameter of the small diameter portion can be used. Therefore, the external force applied when connecting the tubes can be reduced, and the connection work becomes simple. If a coil spring is provided inside the guide sleeve to urge the plunger toward the governor valve to cancel the weight of the plunger, the length of the coil spring may be adjusted from the end of the plunger opposite to the governor valve side to the protruding portion of the main body. Since the length of the coil spring can be shortened, the length of the coil spring can be shortened. Such shortening of the length of the coil spring facilitates the work of attaching the coil spring to the inside of the guide sleeve, and is advantageous in terms of cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows 1st Embodiment of the solenoid proportional valve with a governor of this invention. Sectional drawing which shows 2nd Embodiment of the solenoid proportional valve with a governor of this invention.

(First embodiment)
A governor-equipped proportional solenoid valve 1 according to a first embodiment of the present invention will be described below with reference to FIG. In the following description, the vertical position of the governor-equipped proportional solenoid valve 1 follows the illustration in FIG.

The governor-equipped proportional solenoid valve 1 is interposed in the gas supply path to the burner, and has two pressure regulating chambers, one of which is a primary pressure chamber 21 and the other of which is a secondary pressure chamber 22 . The governor-equipped proportional solenoid valve 1 includes a lower primary pressure chamber 21 communicating with a gas inlet 21a, an upper secondary pressure chamber 22 communicating with a gas outlet 22a, and primary pressure chambers 21 and 2. It has a casing 2 having a valve hole 24 formed with a valve seat 23 existing between secondary pressure chambers 22 . The valve seat 23 is formed on the inner circumference of the valve hole 24 , and the primary pressure chamber 21 and the secondary pressure chamber 22 are communicated through the valve hole 24 .

The governor-equipped proportional solenoid valve 1 includes a diaphragm 3 facing the primary pressure chamber 21 on the lower side opposite to the valve seat 23, a resin governor valve 4 connected to the diaphragm 3, and the governor valve 4 on the upper side. It is provided with an electromagnetic solenoid 5 arranged on the side opposite to the primary pressure chamber 21 across the diaphragm 3 (that is, on the side of a back pressure chamber 32 to be described later) that presses to the opening side.

The outer peripheral portion of the diaphragm 3 is clamped and fixed to the outer peripheral portion of the lower surface of the primary pressure chamber 21 by a pressing plate 31 fastened to the lower surface of the casing 2 . A back pressure chamber 32 facing away from 21 and open to the atmosphere is defined. The back pressure chamber 32 is isolated from the primary pressure chamber 21 by the diaphragm 3 . A cylindrical valve holder 34 having a flange 34 a at its upper end that contacts the lower surface of the diaphragm 3 via a washer 33 is provided below the diaphragm 3 to connect the diaphragm 3 to the governor valve 4 . The diaphragm 3 receives the gas pressure in the primary pressure chamber 21 and urges the governor valve 4 to the closing side.

The governor valve 4 is inserted through the valve hole 24 and has a valve body 41 whose outer diameter gradually increases toward the end (upper end) on the secondary pressure chamber 22 side. and a valve shaft 42 . The valve stem 42 extends coaxially from the valve body 41 both upward and downward.

The electromagnetic solenoid 5 includes a yoke 51 attached to the lower surface of the pressing plate 31, a bobbin 52 provided inside the yoke 51, a solenoid coil 53 wound around the outer periphery of the bobbin 52, and an inner side of the solenoid coil 53. is inserted into a metal guide sleeve 54 arranged inside the bobbin 52, and is guided by the inner peripheral portion of the guide sleeve 54 to move in the axial direction (vertical direction) of the valve shaft 42. and a coil spring 56 that urges the plunger 55 upward to cancel the weight of the plunger 55 . The plunger 55 has its upper end in contact with the lower end of the diameter-reduced portion 42 a present at the lower end of the valve shaft 42 , and exerts a pressing force on the valve shaft 42 in proportion to the value of the current applied to the solenoid coil 53 to move the valve body 41 . and presses the governor valve 4 to the opening side. A hole is formed in the center of the retainer plate 31 so that the lower end of the diameter-reduced portion 42a of the valve shaft 42 and the upper end of the plunger 55 can come into contact with each other. is inserted into the

Here, the governor valve 4 adjusts the opening degree of the valve hole 24 by adjusting the distance from the valve seat 23 . That is, as the current value of the current supplied to the solenoid coil 53 increases, the pressing force increases, causing the plunger 55 to move upward. , and the distance between the valve seat 23 and the valve body 41 increases. As a result, the opening of the valve hole 24 increases, the gas pressure in the secondary pressure chamber 22 increases, and the amount of gas supplied to the burner changes in proportion to the current value. Further, when the gas pressure in the primary pressure chamber 21 fluctuates, the valve body 41 is vertically displaced via the diaphragm 3 and the valve shaft 42, and the opening degree of the valve hole 24 changes so as to absorb the gas pressure fluctuation. As a result, gas pressure fluctuations in the secondary pressure chamber 22 are suppressed. Therefore, even if the gas pressure in the primary pressure chamber 21 fluctuates, the gas pressure in the secondary pressure chamber 22 is maintained at a predetermined pressure corresponding to the current value.

The guide sleeve 54 includes a body portion 54a contained in the electromagnetic solenoid 5 and extending from the end of the electromagnetic solenoid 5 on the side of the diaphragm 3 to the end on the side opposite to the diaphragm 3 (from the upper end of the yoke 51 to the lower end of the bobbin 52). , and a protruding portion 54b integrally formed with a main body portion 54a protruding outside the electromagnetic solenoid 5 toward the side opposite to the primary pressure chamber 21. As shown in FIG. An open hole 54d for opening the back pressure chamber 32 to the atmosphere is formed in the center of the end face 54c (lower end face) of the projecting portion 54b opposite to the main body portion 54a. The guide sleeve 54 communicates with the back pressure chamber 32 .

Such a guide sleeve 54 is attached to the electromagnetic solenoid 5 by being inserted through a hole formed in the center of the yoke 51 . For this attachment, the guide sleeve 54 is provided with a flange 54e extending radially outward from the hole of the yoke 51 at the upper end of the body portion 54a. A presser ring 57 is attached to the hole of the presser plate 31 for clamping and fixing the flange 54e between the yoke 51 and the presser plate 31. As shown in FIG.

Further, the electromagnetic solenoid 5 is provided with a magnetic path plate 58 forming its lower end portion and a hollow tubular collar 59 erected on the upper surface of the magnetic path plate 58 . The collar 59 is made of a magnetic material and is a component for efficiently transferring magnetic flux between the magnetic path plate 58 and the plunger 55 . A hole is formed in the center of the magnetic path plate 58, and the protruding portion 54b of the guide sleeve 54 is inserted downward into this hole. The collar 59 is attached to the main body portion 54a of the guide sleeve 54 by fitting it over the body portion 54a of the guide sleeve 54, and has a flange 59a extending radially outward and contacting the upper surface of the magnetic path plate 58 at its lower end.

The coil spring 56 is inserted into the body portion 54a and the projecting portion 54b of the guide sleeve 54. As shown in FIG. Specifically, the upper end of the coil spring 56 is fitted into a recess 55a formed in the lower end of the plunger 55, and a fixing plate 54f formed with a hole into which the lower end of the coil spring 56 is fitted is a projecting portion. It is provided at the lower end of 54b. That is, the coil spring 56 is interposed between the end of the plunger 55 on the side opposite to the contact side of the valve shaft 42 (the governor valve 4 side) and the end of the projecting portion 54b. By bringing the lower end of the coil spring 56 into contact with the inside of the lower end surface of the projecting portion 54b, the plunger 55 can be urged upward.

In the governor-equipped proportional solenoid valve 1 described above, the back pressure chamber 32 communicates with the inside of the main body portion 54 a of the guide sleeve 54 through the inside of the pressing ring 57 , and also communicates with the inner peripheral surface of the main body portion 54 a and the outer peripheral surface of the plunger 55 . It communicates with the inside of the protruding portion 54b through a sliding clearance existing therebetween, and is exposed to the atmosphere through an open hole 54d formed in the end face 54c. For this reason, there is no need for a separate dedicated component or the like for opening the back pressure chamber 32 to the atmosphere. Therefore, it is possible to simplify the structure and reduce the cost associated therewith, and it is possible to produce the governor-equipped proportional solenoid valve 1 of stable quality without the risk of rattling which has occurred in the conventional assembly. In addition, since the protruding portion 54b of the guide sleeve 54 becomes a connected portion when connecting the tube, deformation due to external force applied when connecting the tube is less likely to occur, and the peripheral portion of the protruding portion 54b is not affected by the external force. It is almost impossible to receive it, and the risk of breakage can be reduced.

(Second embodiment)
A governor-equipped proportional solenoid valve 1a according to a second embodiment of the present invention will be described with reference to FIG. With respect to the governor-equipped proportional solenoid valve 1a, portions corresponding to the respective portions of the governor-equipped proportional solenoid valve 1 shown in FIG.

The governor-equipped proportional solenoid valve 1a is the same except that the guide sleeve 54 and the coil spring 56 are different from the guide sleeve 54 and the coil spring 56 of the governor-equipped proportional solenoid valve 1 shown in FIG.

In the governor-equipped proportional solenoid valve 1a, the projecting portion 54b of the guide sleeve 54 has _a small diameter portion 54b1 having an outer diameter smaller than that of the _main body portion 54a, and an end surface _54c1 of the small diameter portion 54b1 on the side opposite to the main body portion 54a. An open hole 54d is formed in (lower end surface). Since the projecting portion 54b has the small diameter portion _54b1 , the coil spring 56 is interposed between the end of the plunger 55 opposite to the contact side of the valve shaft 42 and the end of the body portion 54a on the projecting portion 54b side. is set. Specifically, the upper end of the coil spring 56 is fitted into a recess 55a formed in the lower end of the plunger 55, and a fixing plate 54f formed with a hole into which the lower end of the coil spring 56 is fitted is a projecting portion. The lower end of the coil spring 56 is provided at the lower end of the projection 54b, and the lower end of the coil spring 56 is brought into contact with the inside of the lower end surface of the small diameter portion _54b1 of the projecting portion 54b, thereby urging the plunger 55 upward. Therefore, in the governor-equipped proportional solenoid valve 1a, the length of the coil spring 56 is shortened compared to the governor-equipped proportional solenoid valve 1 shown in FIG.

In the governor-equipped proportional solenoid valve 1a described above, the portion to be connected when connecting _a tube can be the small diameter portion _54b1 . The external force applied to connect the tubes can be reduced, and the connection work becomes simple. Moreover, shortening the length of the coil spring 56 as described above is not only advantageous for cost reduction, but also facilitates the mounting work of the coil spring 56 inside the guide sleeve 54 .

Although the present invention has been described with respect to the first and second embodiments, the present invention is not limited to these embodiments. For example, the governor-equipped proportional solenoid valves 1 and 1a can be turned upside down, and the holding plate 31, the back pressure chamber 32 and the electromagnetic solenoid 5 can be arranged above the diaphragm 3. FIG. In this case, it is necessary to cancel the self weight of the governor valve 4. To cancel the self weight of the governor valve 4, a coil spring different from the coil spring 56 is interposed between the lower surface of the casing 2 and the valve body 41 or the lower end of the valve shaft 42. It can be realized by providing an upper portion and urging the valve body 41 and the valve shaft 42 upward. Also, the coil spring 56 can be omitted.

Also, the mounting method of the electromagnetic solenoid 5 to the pressing plate 31 is not particularly limited. A wide variety of methods can be employed, including conventionally known methods. Furthermore, the opening position of the open hole _54d in the end face 54c of the protruding portion 54b or the end face _54c1 of the small diameter portion 54b1 does not necessarily have to be in the center, and may be eccentric unless it is closed by the inner peripheral surface of the tube to be connected. You can also Furthermore, the fixing plate 54f is not necessarily required for inserting the coil spring 56 into the guide sleeve 54, and the fixing plate 54f can be omitted. In the casing 2, the side facing the diaphragm 3 can be a primary pressure chamber, and the opposite side across the valve seat 23 can be a secondary pressure chamber. The gas inlet 21a serves as a gas outlet. Also, the diaphragm 3 faces the secondary pressure chamber and the back pressure chamber 32 faces the diaphragm 3 on the opposite side of the secondary pressure chamber.

1, 1a... Electromagnetic proportional valve with governor 21... Primary pressure chamber (one pressure regulating chamber) 22... Secondary pressure chamber (other pressure regulating chamber) 23... Valve seat 24... Valve hole 3... Diaphragm 32 Back pressure chamber 4 Governor valve 5 Electromagnetic solenoid 54 Guide sleeve 54a Main body 54b Protruding portion 54b ₁ Small diameter portion 54c End face of the protruding portion 54c ₁ Small diameter portion end face, 54d... open hole, 55... plunger.

Claims (1)

Two pressure regulating chambers communicated by a valve hole in which a valve seat is formed, a governor valve that adjusts the opening of the valve hole by adjusting the distance from the valve seat, and one of the pressure regulating chambers connected to the governor valve. a diaphragm that receives the pressure in one of the pressure regulating chambers and biases the governor valve to the valve closing side; a back pressure chamber that is separated from the one pressure regulating chamber by the diaphragm; It is provided with an electromagnetic solenoid that applies a pressing force proportional to the energized current to the governor valve via the plunger, and a guide sleeve that communicates with the back pressure chamber and guides the movement of the plunger on the inner periphery inside the electromagnetic solenoid. In a solenoid proportional valve with a governor,
The guide sleeve is formed by integrally forming a main body part contained in the electromagnetic solenoid and a projecting part projecting to the outside of the electromagnetic solenoid toward the side opposite to the one pressure adjustment chamber side, and the projecting part is An electromagnetic proportional valve with a governor, characterized in that it has a small diameter portion whose outer diameter is smaller than that of the main body portion, and an open hole for opening the back pressure chamber to the atmosphere is opened in the end face of the small diameter portion opposite to the main body portion. .

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