JP2020094611A - Electromagnetic proportional valve with governor - Google Patents

Abstract

To provide an electromagnetic proportional valve with a governor that can be produced with stable quality without causing any backlash when being assembled, of which part to be connected and the peripheral part thereof are less likely to deform when being subjected to external force when being connected to a tube and have reduced possibility of breakage, is simplified in structure and reduced in cost.SOLUTION: In an electromagnetic proportional valve 1 with a governor, a guide sleeve 54 is formed integrally with a body part 54a incorporated in an electromagnetic solenoid 5 and a projection part 54b projecting outside of the electromagnetic solenoid toward an opposite side to a side of one pressure adjustment chamber, and an opening hole 54d for opening a back-pressure chamber 32 to the atmosphere is bored in an end surface 54c on an opposite side to the body part of the projection part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solenoid-operated proportional valve with a governor, which is provided in a gas supply passage or the like for a burner.

Conventionally, as this type of electromagnetic proportional valve with a governor, the opening of the valve hole is adjusted by adjusting the distance between the valve seat and the two pressure adjusting chambers that are communicated by the valve hole having the valve seat. A governor valve and a diaphragm that is connected to the governor valve and is provided in one pressure adjustment chamber, and that receives the pressure in one pressure adjustment chamber and urges the governor valve to the valve closing side, and isolates the one pressure adjustment chamber with the diaphragm. A back pressure chamber that is defined, and an electromagnetic solenoid that is provided on the back pressure chamber side and that applies a pressing force proportional to the energizing current to the governor valve via the plunger.Communicates with the back pressure chamber and the plunger inside the solenoid solenoid. And a guide sleeve that guides the movement of the inner peripheral portion at the inner peripheral portion thereof (see, for example, Patent Document 1).

Further, in the above-mentioned electromagnetic proportional valve with a governor, a small hole communicating with the back pressure chamber is formed in the holding plate that clamps and fixes the diaphragm at its outer peripheral portion to the outer peripheral portion of one pressure adjusting chamber (primary pressure chamber). There is. In addition, a communication member is provided which projects outward from the mating portion of the electromagnetic solenoid and the holding plate to open the back pressure chamber to the atmosphere, and a fixing portion which fixes the communication member by engagement is provided in the electromagnetic solenoid. Thus, in the above-mentioned electromagnetic proportional valve with a governor, the communication member can be pinched and fixed by the holding plate and the fixing portion during assembly.

However, as a result of subsequent studies, the above-mentioned fixation of the communication member by the holding plate and the fixing part is affected by the dimensional accuracy of the holding plate and the fixing part including the communication member, and rattling occurs during assembly, resulting in sufficient fixing strength. It may be difficult to secure the connection, and if the tube is connected to the communication member with insufficient fixing strength, the communication member and its peripheral parts may be deformed by the external force at that time, and it may be damaged due to excessive deformation. The problem of being there was found. Further, since dedicated members such as a communication member and a fixing portion are required for opening the back pressure chamber to the atmosphere, it is desired to simplify the structure and reduce costs.

JP, 2013-249874, A

In view of the above points, the present invention can be produced with stable quality without rattling at the time of assembly, and the connected portion and its peripheral portion are not easily deformed due to an external force at the time of connecting the tube, and are damaged. It is an object of the present invention to provide a solenoid-operated proportional valve with a governor that can reduce the risk of the above and can simplify the structure and reduce the cost associated therewith.

In order to solve the above problems, the present invention provides two pressure adjusting chambers that are communicated with each other by a valve hole having a valve seat formed therein, and a governor valve that adjusts the distance between the valve seat and the opening of the valve hole. , A diaphragm that is connected to the governor valve and faces one of the pressure control chambers, and that receives the pressure in the one pressure control chamber to urge the governor valve to the valve closing side, and is separated from the one pressure control chamber by the diaphragm. The back pressure chamber and the electromagnetic solenoid that is provided on the back pressure chamber side and that applies a pressing force proportional to the energizing current to the governor valve via the plunger communicates with the back pressure chamber and moves the plunger inside the electromagnetic solenoid. In a solenoid proportional valve with a governor equipped with a guide sleeve for guiding the inner peripheral portion of the solenoid, the guide sleeve includes a main body portion enclosed in an electromagnetic solenoid and an electromagnetic solenoid facing the opposite side of the one pressure adjusting chamber side. Is integrally formed with a projecting portion projecting outside, and an opening hole for opening the back pressure chamber to the atmosphere is formed in an end surface of the projecting portion opposite to the main body portion.

According to the present invention, the guide sleeve for guiding the movement of the plunger at the inner peripheral portion is formed integrally with the main body portion, and the end surface on the opposite side of the main body portion has an opening hole for opening the back pressure chamber to the atmosphere. Since it is composed of a projecting portion that is opened, a dedicated part or the like is not separately required for opening the back pressure chamber to the atmosphere. Therefore, the structure can be simplified and the cost can be reduced accordingly, and there is no fear of rattling that has conventionally occurred at the time of assembly, and it is possible to produce a stable electromagnetic proportional valve with a governor. Further, since the protruding portion of the guide sleeve serves as a connected portion when connecting the tube, deformation due to an external force applied when connecting the tube is less likely to occur, and the peripheral portion of the protruding portion may be affected by the external force. Almost no damage can be reduced.

In the present invention, the projecting portion preferably has a small diameter portion having an outer diameter smaller than that of the main body portion, and an opening hole is preferably formed in an end surface of the small diameter portion on the side opposite to the main body portion. According to this, the connected portion at the time of connecting the tube can be a small diameter portion, and it becomes possible to use a tube having a small inner diameter according to the outer diameter of the small diameter portion. Therefore, the external force applied at the time of connecting the tubes can be reduced, and the connecting work becomes simple. If a coil spring is provided inside the guide sleeve to cancel the weight of the plunger by urging the plunger toward the governor valve, adjust the length of the coil spring from the end of the plunger opposite the governor valve side to the protruding part of the main body. 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 cost reduction.

Sectional drawing which shows 1st Embodiment of the electromagnetic proportional valve with a governor of this invention. Sectional drawing which shows 2nd Embodiment of the electromagnetic proportional valve with a governor of this invention.

(First embodiment)
A solenoid proportional valve 1 with a governor according to a first embodiment of the present invention will be described below with reference to FIG. The top and bottom of the governor-equipped electromagnetic proportional valve 1 in the following description are as shown in FIG.

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

In addition, the electromagnetic proportional valve with a governor 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 a governor valve 4 above. It is provided with an electromagnetic solenoid 5 which is pressed to the open side and which is arranged on the side opposite to the primary pressure chamber 21 (that is, on the back pressure chamber 32 side described later) with the diaphragm 3 interposed therebetween.

The outer peripheral part of the diaphragm 3 is clamped and fixed to the outer peripheral part of the lower surface of the primary pressure chamber 21 by a pressing plate 31 that is fastened to the lower surface of the casing 2, and the diaphragm 3 is held between the diaphragm 3 and the pressing plate 31. A back pressure chamber 32 facing the opposite side of 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. Further, below the diaphragm 3, a cylindrical valve holder 34 having a flange 34 a that contacts the lower surface of the diaphragm 3 via a washer 33 at the upper end is provided, and the diaphragm 3 is connected 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 valve closing side.

The governor valve 4 is inserted through the valve hole 24 and has a valve body 41 having an outer diameter gradually increased toward the end (upper end) on the secondary pressure chamber 22 side, and extends from the valve body 41 and is connected to the diaphragm 3. And a valve shaft 42. The valve shaft 42 extends from the valve body 41 both vertically and on the same axis.

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. The guide sleeve 54 is made of metal and is inserted inside the bobbin 52. The guide sleeve 54 is inserted into the guide sleeve 54, 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. It has a plunger 55 and a coil spring 56 that biases the plunger 55 upward to cancel the weight of the plunger 55. The upper end of the plunger 55 is in contact with the lower end of the reduced diameter portion 42a existing at the lower end of the valve shaft 42, and the pressing force proportional to the value of the current supplied to the solenoid coil 53 acts on the valve shaft 42 to move the valve body 41. It is displaced and the governor valve 4 is pressed toward the open side. In order to allow the lower end of the reduced diameter portion 42a of the valve shaft 42 and the upper end of the plunger 55 to come into contact with each other, a hole is formed at the center of the pressing plate 31, and the reduced diameter portion 42a is inside the upper end portion of the guide sleeve 54. Has been inserted into.

Here, the governor valve 4 adjusts the opening of the valve hole 24 by adjusting the interval with the valve seat 23. That is, as the current value of the current supplied to the solenoid coil 53 is increased, the pressing force is increased and the plunger 55 is moved upward, and accordingly, in the governor valve 4, the valve shaft 42 is moved upward and the valve body 41 is displaced. However, the distance between the valve seat 23 and the valve body 41 increases. As a result, the opening degree 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, fluctuations in the gas pressure 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 according to the current value.

The guide sleeve 54 extends from the end of the electromagnetic solenoid 5 on the diaphragm 3 side 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 is enclosed by the electromagnetic solenoid 5. It is composed of a protrusion 54b that is integrally formed with the main body 54a and protrudes to the outside of the electromagnetic solenoid 5 toward the side opposite to the primary pressure chamber 21. An opening hole 54d for opening the back pressure chamber 32 to the atmosphere is formed in the center of the end surface 54c (lower end surface) of the protruding 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 inserted into a hole formed at the center of the yoke 51 and attached to the electromagnetic solenoid 5. For this attachment, the guide sleeve 54 is provided at the upper end of the main body portion 54a with a flange 54e extending outward of the hole diameter of the above-mentioned hole of the yoke 51. A pressing ring 57 for clamping and fixing the flange 54e between the flange 54e and the yoke 51 is attached to the hole of the pressing plate 31.

Further, the electromagnetic solenoid 5 is provided with a magnetic path plate 58 that constitutes the lower end portion thereof, and a hollow cylindrical collar 59 that is 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 exchanging the 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 through the hole downward. The collar 59 is externally fitted and attached to the main body portion 54a of the guide sleeve 54, and a flange 59a that extends radially outward and contacts the upper surface of the magnetic path plate 58 is provided at the lower end.

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

In the above-described electromagnetic proportional valve 1 with governor, the back pressure chamber 32 communicates with the inside of the main body portion 54a of the guide sleeve 54 through the inside of the holding ring 57, and the inner peripheral surface of the main body portion 54a and the outer peripheral surface of the plunger 55. Is communicated with the inside of the projecting portion 54b through a sliding clearance existing between the two, and is opened to the atmosphere by an opening hole 54d formed in the end surface 54c. For this reason, a dedicated component or the like is not separately required for opening the back pressure chamber 32 to the atmosphere. Therefore, the structure can be simplified and the cost can be reduced accordingly, and it is possible to produce the electromagnetic proportional valve 1 with a governor of stable quality without the risk of rattling that has conventionally occurred during assembly. Further, since the protruding portion 54b of the guide sleeve 54 serves as a connected portion when connecting the tube, deformation due to an external force applied when connecting the tube is less likely to occur, and the peripheral portion of the protruding portion 54b reduces the influence of the external force. It is almost never received, and the risk of damage can be reduced.

(Second embodiment)
A solenoid proportional valve 1a with a governor according to a second embodiment of the present invention will be described with reference to FIG. Regarding the electromagnetic proportional valve 1a with a governor, parts corresponding to the respective parts of the electromagnetic proportional valve 1 with a governor shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted below.

The electromagnetic proportional valve 1a with a governor is the same in other parts 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 electromagnetic proportional valve 1 with a governor shown in FIG.

In governor electromagnetic proportional valves 1a, the guide protrusions 54b of the sleeve 54 has a small diameter portion 54b ₁ outer diameter smaller than the body portion 54a, the end surface 54c ₁ opposite to the main body portion 54a of the small diameter portion 54b ₁ An open hole 54d is formed in (lower end surface). Since the protruding portion 54b has a small diameter portion 54b _1, the coil spring 56, through the period from the end of the contact side opposite to the valve stem 42 of the plunger 55 to the ends of the projections 54b of the main body portion 54a It is set up. Specifically, the upper end of the coil spring 56 is fitted in the recess 55a formed in the lower end of the plunger 55, and the fixing plate 54f formed with a hole into which the lower end of the coil spring 56 is fitted is a protruding portion. provided at the lower end of 54b, by abutting the lower end of the coil spring 56 to the lower end face inside of the small diameter portion 54b ₁ of the projecting portion 54b, so that it urges the plunger 55 upward. Therefore, in the electromagnetic proportional valve 1a with a governor, the length of the coil spring 56 is shortened as compared with the electromagnetic proportional valve 1 with a governor shown in FIG.

In more governor electromagnetic proportional valves 1a, the connected part for connecting the tube can be a small diameter portion 54b _1, allows the use of an inner diameter narrow tube in accordance with the outer diameter of the small-diameter portion 54b _1, The external force applied to the tube connection can be reduced, which simplifies the connection work. Further, the shortening of the length of the coil spring 56 as described above is not only advantageous in cost reduction, but also facilitates the work of mounting the coil spring 56 inside the guide sleeve 54.

Although the present invention has been described above with reference to the first and second embodiments, the present invention is not limited to these embodiments. For example, the governor-equipped solenoid proportional valves 1 and 1a can be upside down, and the holding plate 31, the back pressure chamber 32, and the solenoid solenoid 5 can be arranged above the diaphragm 3. In this case, it is necessary to cancel the dead weight of the governor valve 4, but in order to cancel the dead 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 lower end of the valve body 41 or the valve shaft 42. It can be realized by urging the valve body 41 and the valve shaft 42 upward. Further, the coil spring 56 can be omitted.

The method of attaching the electromagnetic solenoid 5 to the holding plate 31 is not particularly limited. A wide variety of methods can be adopted, including conventionally known ones. Furthermore, open position of the open hole 54d at the end face 54c ₁ of the end face 54c or the small diameter portion 54b ₁ of the protrusion 54b is not necessarily the center, unless closed by the inner circumferential surface of the connected tube, to the eccentric position You can also do it. Furthermore, the fixing plate 54f is not always necessary 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 with the valve seat 23 in between can be a secondary pressure chamber. In this case, the gas outlet 22a serves as a gas inlet. The gas inlet 21a serves as a gas outlet. 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 adjustment chamber), 22... Secondary pressure chamber (other pressure adjustment chamber), 23... Valve seat, 24... Valve hole, 3... diaphragm, 32 ... back pressure chamber, 4 ... Gabanabarubu, 5 ... electromagnetic solenoid 54 ... guide sleeve, 54a ... main body portion, 54b ... protrusion, 54b 1 _... small-diameter portion, the end face of 54c ... projecting portion, 54c 1 _... small-diameter portion End face, 54d... open hole, 55... plunger.

Claims (2)

Two pressure adjusting chambers that are communicated by a valve hole formed with a valve seat, a governor valve that adjusts the distance between the valve seat and the opening of the valve hole, and one pressure adjusting chamber that is connected to the governor valve. Of the pressure control chamber, the diaphragm for biasing the governor valve to the valve closing side, the back pressure chamber separated from the one pressure regulation chamber by the diaphragm, and the back pressure chamber side. Provided with an electromagnetic solenoid that applies a pressing force proportional to the energizing current to the governor valve via the plunger, and a guide sleeve that communicates with the back pressure chamber and that guides the movement of the plunger inside the electromagnetic solenoid at the inner circumference. In a solenoid proportional valve with a governor,
The guide sleeve is formed by integrally forming a main body part enclosed in the electromagnetic solenoid and a protruding part protruding outside the electromagnetic solenoid toward the side opposite to the one pressure adjusting chamber side. An electromagnetic proportional valve with a governor characterized in that an opening hole for opening the back pressure chamber to the atmosphere is provided on the end face opposite to the section. The governor according to claim 1, wherein the projecting portion has a small diameter portion having an outer diameter smaller than that of the main body portion, and the open hole is formed in an end surface of the small diameter portion opposite to the main body portion. With solenoid proportional valve.

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