JP2015052332A - Duplex solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duplex solenoid valve enabling two valves to be changed over by a single solenoid and enabling its size to become small and its energy saving to be attained.SOLUTION: This invention comprises: each of first and second movable iron cores 3, 3having each of first and second valves 2, 2at one end; each of first and second guide cylinders 4, 4having each of the movable iron cores slidably inserted into it; each of first and second fixed iron cores 5, 5arranged at the other end of each of the guide cylinders so as to be oppositely faced against each of the movable iron cores; a first frame 8arranged to connect both fixed iron cores; a second frame 8arranged to connect one end of each of both guide cylinders; and a single solenoid 9 arranged to enclose one of both guide cylinders. Energization of the solenoid 9 causes each of the first and second movable iron cores 2, 2to be attracted and moved toward each of the fixed iron cores 5, 5and then each of the valves 2, 2is changed over in operation.

Description

  The present invention relates to a dual solenoid valve having two valve bodies mainly used in a combustion apparatus.

  Conventionally, in a combustion apparatus, in order to ensure redundancy for preventing gas leakage from a burner when combustion is stopped, two solenoid valves are provided in series in the gas supply path, resulting in a valve closing failure of one solenoid valve. However, gas leakage can be prevented by the other solenoid valve (see, for example, Patent Document 1).

  In this system, each solenoid valve is provided with one solenoid, and two solenoid valves are required for two solenoid valves, increasing the occupied space and power consumption. For this reason, the conventional devices cannot meet the recent demands for miniaturization and power saving.

Japanese Patent Laid-Open No. 10-2446

  In view of the above points, the present invention provides a double solenoid valve that can switch between two valve bodies with a single solenoid so as to achieve downsizing and power saving. It is an issue.

  In order to solve the above-described problems, the dual solenoid valve of the present invention includes first and second valve bodies, and first and second movable bodies each having the first and second valve bodies connected to one end. An iron core, first and second guide cylinders into which the first and second movable iron cores are slidably inserted from the opening end of one end, and the other ends of the first and second guide cylinders. The first and second fixed iron cores arranged to face the first and second movable iron cores, and the first and second movable iron cores abut on the first and second fixed iron cores. The first and second movable iron cores or the first and second buffer cores provided on the first and second movable iron cores or the fixed iron cores, and the first and second movable iron cores so as to absorb the impact when Each of the first and second valve springs biased in a direction away from each of the two fixed iron cores, a first frame disposed so as to connect both the first and second fixed iron cores, and first and second One end of both guide tubes A second frame arranged like a bush, and a single solenoid arranged so as to surround one of the first guide cylinder and the second guide cylinder, and from the first movable iron core to the first fixed iron core and the first A magnetic path is configured to return to the first movable iron core via the frame, the second fixed iron core, the second movable iron core, and the second frame, and the first and second movable iron cores are connected to the first and second by energizing the solenoid. The first and second valve bodies are switched by being moved by suction toward the first and second fixed iron cores against the urging force of the second valve springs. Features.

  According to the present invention, the first and second two valve bodies can be switched by a single solenoid. Therefore, it is possible to achieve downsizing and power saving as compared with those using two solenoid valves each having a solenoid.

  In the present invention, the distance between the first fixed iron core or the first movable iron core and the first buffer member when the solenoid is not energized, the second fixed iron core or the second movable iron core and the second buffer member, It is desirable to make the distance between the different. According to this, when the solenoid is energized, the timing when the first movable iron core comes into contact with the first fixed iron core via the first buffer member, and the second movable iron core via the second buffer member. The timing of contact with the contact is shifted, and noise (suction sound) generated by contact can be reduced.

  Here, the double solenoid valve of the present invention can be used to ensure redundancy for preventing fluid leakage. In other words, a first valve chamber that houses the first valve body and a second valve chamber that houses the second valve body are arranged in series in the valve housing, and the first and second valves are energized when the solenoid is not energized or energized. The first and second valve seats facing the first and second valve chambers, on which the second valve bodies are seated, are provided, and the flow path in the valve housing is formed by both the first and second valve bodies. Can be cut off twice to ensure redundancy for preventing fluid leakage.

  Moreover, the double solenoid valve of the present invention can be used for flow rate switching. That is, the first valve chamber in which the first valve body is housed and the second valve chamber in which the second valve body is housed are arranged in parallel in the valve housing, and the first valve body can be seated thereon. A first valve seat facing the first valve seat and a second valve seat facing the second valve chamber on which the second valve body can be seated, and one of the first and second valve bodies when energizing the solenoid Is seated on the corresponding one of the first and second valve seats, and when the solenoid is not energized, the other valve body of the first and second valve bodies is the first one. The second and second valve seats can be seated on the other corresponding valve seat so that the flow rate can be switched by energizing or de-energizing the solenoid.

  The double solenoid valve of the present invention can also be used for flow control of two kinds of fluids. That is, a first flow path in which a first valve chamber for housing a first valve body is interposed in a valve housing, and a second flow path in which a second valve chamber for storing a second valve body is interposed, The first and second valve seats facing the first and second valve chambers are provided to seat the first and second valve bodies when the solenoid is de-energized or energized. By flowing different kinds of fluids through the first flow path and the second flow path, it is possible to control the flow of two kinds of fluids such as fuel gas and air.

  Further, in the present invention, when the diameters of the first and second valve bodies are different, the solenoid is a guide in which a movable iron core that connects the large diameter valve bodies of the first and second guide cylinders is inserted. It is desirable to arrange so as to surround the cylinder. According to this, a large magnetic attractive force acts on the movable iron core connected to a large-diameter valve body that increases the force required for the switching operation, and even if the energization current value to the solenoid is relatively small, the attractive force is insufficient. It is possible to prevent malfunction and to save power.

Sectional drawing of the double solenoid valve of 1st Embodiment of this invention. Sectional drawing of the double solenoid valve of 2nd Embodiment of this invention. Sectional drawing of the dual solenoid valve of 3rd Embodiment of this invention.

FIG. 1 shows a dual solenoid valve according to a first embodiment of the present invention provided in a gas supply path to the burner B. The twin solenoid valve includes a first and second respective valve body 2 _1, 2 ₂ housed in the valve housing 1, first and second respective valve body 2 _1, 2 ₂ one end (in FIG. 1 The first and second movable iron cores 3 ₁ and 3 ₂ connected to the lower end) and the first and second movable iron cores 3 ₁ and 3 ₂ are slidably inserted from the opening end 4a at one end. 1 and second guide cylinders 4 ₁ and 4 _2, and first and second movable iron cores at the other end portions (upper end portions in FIG. 1) of the first and second guide cylinders 4 ₁ and 4 ₂ . 3 _{1, 3 2} first arranged so as to face the and second respective fixed core ₅ 1, _{5 2,} first and second respective movable iron core ₃ 1, _{3 2} first and second each fixed core 5 _1, 5 ₂ and the first to absorb impact when the contact second respective movable iron core 3 _1, 3 ₂ first and provided on the second the buffer member 6 _1, 6 _2, first and second respective movable iron core ₃ 1, _{3 2} It includes 1 first and ₁ second valves of the spring _7, 7 ₂ and which biases the second direction away from the fixed core 5 _1, 5 _2.

Twin solenoid valve further includes both the first and second fixed core ₅ 1, _{5 2} and the first frame _{8 1} disposed so as to connect the first and second the guide tube ₄ 1, _{4 2} one end portion and the second frame ₈₂ which is arranged so as to connect the (lower end in FIG. 1), the first guide tube 4 ₁ while (the embodiment of the second guide tube 4 ₂ first guide tube 4 of the ₁ ) and a single solenoid 9 arranged so as to surround. Then, as shown by the one-dot chain line in FIG. 1, the first movable iron core _{3 1} first stationary iron core _{5 1} and the first frame ₈₁ and the second fixed core _{5 2} second movable iron core _{3 2} second frame 8 ₂ and the magnetic path H to return to the first movable iron core 3 ₁ via is to be configured.

The valve housing 1 has an inlet 11 and an outlet 12. The valve housing 1, always communicates with the inlet 11, the first valve chamber 13 ₁ for accommodating the first valve body _{2 1,} and a second valve chamber 13 ₂ for housing the second valve body _{2 2} series Is arranged. Also, the first and second valves that face the lower side of the first and second valve chambers 13 ₁ , 13 ₂ and on which the first and second valve bodies 2 ₁ , 2 ₂ can be seated. Seats 14 ₁ and 14 ₂ are provided. Then, when the first valve body _{2 1} is separated from the first valve seat 14 _1, the first valve chamber 13 ₁ is communicated with the second valve chamber 13 ₂ through the communication passage 15, the second valve body _{2 2} There it away from the second valve seat 14 _2, so that the second valve chamber 13 ₂ is communicated with the outlet 12.

When the solenoid 9 is not energized, the first and second valve bodies 2 ₁ and 2 ₂ are moved to the first and second valves by the urging force of the first and _second valve springs 7 ₁ and 7 ₂ . seated on the seat ₁₄ 1, 14 _2, gas flow path between the inlet 11 and the outlet 12 is interrupted double in the first valve body _{2 1} and the second valve body _{2 2,} from the burner B Redundancy for preventing gas leakage is ensured. During energization of the solenoid 9, the first and second of the movable iron core 3 _1, 3 ₂ first and the first against the second of each valve spring _71, 7 ₂ of the urging force of the second The first and second valve bodies 2 ₁ , 2 ₂ are moved toward the stationary iron cores 5 ₁ , 5 ₂ so that the first and second valve bodies 2 ₁ , 2 ₂ are separated from the first and second valve seats 14 ₁ , 14 _2. The switching operation is performed, the gas flow path is opened, and the gas is supplied to the burner B.

Here, in this embodiment, since the continuous magnetic path H which passes both the 1st and 2nd movable iron cores 3 ₁ and 3 ₂ is comprised, both the 1st and 2nd valve bodies by the single solenoid 9 are comprised. 2 ₁ and 2 ₂ can be switched. Therefore, it is possible to achieve downsizing and power saving as compared with those using two solenoid valves each having a solenoid.

Further, in this embodiment, the distance L1 between the first fixed core 5 ₁ and the first buffer member ₆₁ in the non-energization of the solenoid 9, a second fixed core 5 ₂ and the second cushion member 6 ₂ For example, L1> L2 is set. According to this, when energized the solenoid 9, the timing the first movable iron core 3 ₁ abuts against the first fixed iron core 5 ₁ via the first buffer member _61, the second movable iron core 3 ₂ second cushioning member 6 ₂ and the timing contacting is shifted to the second fixed core 5 ₂ through. Therefore, as compared with the case where the first and second movable iron cores 3 ₁ and 3 ₂ are in contact with the first and _second fixed iron cores 5 ₁ and 5 ₂ at the same time, the adsorption sound that is noise generated by the contact is obtained. Can be reduced.

  Next, a dual solenoid valve according to a second embodiment of the present invention for switching the gas flow rate supplied to the burner B will be described with reference to FIG. The basic structure of the double solenoid valve of the second embodiment is the same as that of the first embodiment, and the same members and parts as those of the first embodiment are denoted by the same reference numerals.

The main difference between the second embodiment and the first embodiment is the structure of the valve casing 1. That is, the valve housing 1 of the second embodiment has one inflow port 11 and first and second outflow ports 12 ₁ and 12 _2, and the inflow port 11 is provided in the valve housing 1. always communicating with a first valve chamber 13 ₁ for accommodating the first valve body 2 ₁ always communicates with the inlet port 11, a second valve chamber 13 ₂ for housing the second valve body 2 ₂ arranged in parallel Has been. The first and second outlets 12 ₁ , 12 ₂ join together and are connected to the downstream gas supply path connected to the burner B.

Facing the first valve chamber 13 ₁ of the lower, first valve seat 14 ₁ first valve body _{2 1} capable seat is provided, the first valve body _{2 1} from the first valve seat 14 ₁ when spaced, first valve chamber 13 ₁ is allowed to communicate with the first outlet port 12 _1. Moreover, facing the upper side of the second valve chamber 13 _2, the second valve seat the second valve body _{2 2} capable seated 14 ₂ are provided, the second valve seat 14 ₂ from the second valve body _{2 2} There when spaced, second valve chamber 13 ₂ is allowed to communicate with the second outlet port 12 _2.

Diameter of hole communicating with the first outlet port 12 ₁ which forms the first valve seat 14 ₁ is much larger than the diameter of the hole communicating with the second outlet port 12 ₂ that forms the second valve seat 14 _2, it is toward the first valve body 2 ₁ a larger diameter than the second valve body 2 _2. Further, the solenoid 9 is arranged so as to surround the first guide tube 4 ₁ first movable iron core 3 ₁ obtained by connecting the first valve body 2 ₁ of large diameter is inserted. Furthermore, as in the first embodiment, the non-energized first stationary iron core 5 ₁ at the time and the distance L1 between the first cushioning member _61, the second fixed core 5 ₂ and the second cushioning member of the solenoid 9 and made different from the distance L2 between the 6 _2.

At a time of non-energization of the solenoid 9, the first valve body 2 ₁ by the biasing force of the first valve spring ₇₁ is seated on the first valve seat 14 _1, the communication between the inlet 11 and the first outlet port 12 ₁ cut off, while the second valve body _{2 2} by the urging force of the second valve spring _{7 2} is separated from the second valve seat 14 _2, the second outlet port 12 ₂ is communicated with the inlet port 11, to the burner B The gas flow rate to be supplied is small. Further, at the time of energization of the solenoid 9, the second valve body 2 ₂ is seated on the second valve seat 14 _2, the communication between the inlet 11 and the second outlet port 12 ₂ is interrupted, while the first valve body 2 ₁ is separated from the first valve seat 14 _1, the first outlet port 12 ₁ is communicated with the inlet port 11, gas flow rate supplied to the burner B is increased. In this way, the gas flow rate is switched by energizing or de-energizing the solenoid 9.

Further, the solenoid 9, since it is arranged so as to surround the first guide tube 4 _1, the first movable iron core 3 ₁ obtained by connecting the first valve body 2 ₁ a large diameter force required switching operation is increased A large magnetic attractive force acts. Therefore, even if the energization current value to the solenoid 9 is relatively small, it is possible to prevent malfunction due to insufficient suction force and to save power.

  Next, the dual solenoid valve of the third embodiment shown in FIG. 3 will be described. This dual solenoid valve is used to control the flow of two kinds of fluids, air and fuel gas, upstream of the fan F that supplies the air-fuel mixture to the burner B. The basic structure of the dual solenoid valve of the third embodiment is the same as that of the first embodiment, and the same reference numerals are used for the same members and parts as those of the first embodiment.

The third in the valve housing 1 of the twin solenoid valve embodiments, a first flow path for flowing air extending from the first inlet 11 ₁ to the first outlet port 12 _1, a second inlet port 11 ₂ second A second flow path for flowing the fuel gas reaching the outflow port 12 ₂ is provided in parallel, and the first and second outflow ports 12 ₁ , 12 ₂ merge and are connected to the fan F.

The first flow path, a first valve chamber 13 ₁ which communicates with the first inlet 11 ₁ housing the first valve body _{2 1,} the first inlet 11 ₁ and the first outlet port 12 ₁ first a first bypass passage 16 ₁ communicates not through the valve chamber 13 ₁ is interposed. In the second flow path, similarly, the second valve chamber 13 ₂ which communicates with the second inlet 11 ₂ housing the second valve body _{2 2,} the second inlet 11 ₂ and the second outlet port 12 ₂ and and a second bypass passage 16 ₂ is interposed communicating without via the second valve chamber 13 _2. Moreover, facing the first valve chamber 13 ₁ of the lower, together with the first valve seat 14 ₁ first valve body 2 ₁ capable seated is provided, facing the lower side of the second valve chamber 13 ₂ , second valve seat the second valve body _{2 2} capable seated 14 ₂ is provided.

The first outlet 12 ₁ is larger in diameter than the ₂ second outlet port 12, the first valve body 2 ₁ corresponds to this is also a larger diameter than the second valve body 2 _2. As in the second embodiment, the solenoid 9 is arranged so as to surround the first guide tube 4 ₁ first movable iron core 3 ₁ obtained by connecting the first valve body 2 ₁ of large diameter is inserted . Furthermore, as in the first and second embodiments, the first stationary core 5 ₁ in the non-energization of the solenoid 9 and the distance L1 between the first cushioning member _61, a second fixed core 5 _Paragraph 2 is a varied and distance L2 between the buffer member 6 _2.

When the solenoid 9 is not energized, the first and second valve bodies 2 ₁ and 2 ₂ are moved to the first and second valves by the urging force of the first and _second valve springs 7 ₁ and 7 ₂ . Seated on the seats 14 ₁ and 14 ₂ , the first and second flow paths are opened only through the first and second side paths 16 ₁ and 16 ₂ , respectively. The ventilation resistance of each flow path of 2 becomes large. On the other hand, when the solenoid 9 is energized, the first and second valve bodies 2 ₁ and 2 ₂ are separated from the first and second valve seats 14 ₁ and 14 ₂ , and the first and second valve bodies 2 ₁ and 2 ₂ are separated from each other. ready for the gas flow path is opened even through the respective first and second respective valve chamber 13 _1, 13 _2, the ventilation resistance of the first and second respective flow path is reduced.

Meanwhile, the second inlet 11 _{and second} upstream side gas supply passage, and the proportional valve is interposed, the proportional valve current as the amount of fuel gas in accordance with the required combustion amount is supplied is controlled, Further, the rotational speed of the fan F is controlled according to the required combustion amount so that the air-fuel ratio of the air-fuel mixture supplied to the burner B becomes constant. However, the required combustion amount becomes a predetermined value or less, the rotation speed of the fan F becomes lower than the lower limit rotation speed at which the proportional characteristic of the blown air volume can be maintained, or the lower limit current at which the proportional valve current can maintain the proportional characteristic of the gas supply amount In the following cases, it becomes impossible to supply air or fuel gas in an amount corresponding to the required combustion amount.

Therefore, in the third embodiment, when the required combustion amount becomes equal to or less than the predetermined value, the energization to the solenoid 9 is stopped to increase the ventilation resistance of the first and second flow paths. According to this, it is possible to supply an amount of air or fuel gas corresponding to a required combustion amount equal to or less than a predetermined value without setting the rotation speed or proportional valve current of the fan F to be equal to or lower than the lower limit rotation speed or lower limit current. Further, since the second valve body 2 ₂ for the first valve body 2 ₁ a fuel gas for air is switched it operates simultaneously in a single solenoid 9, temporarily in the first valve body 2 ₁ closing delay or become air excess, that may become temporarily gas excess in the second valve body 2 ₂ of the valve closing delay can be prevented.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, may be provided first and second respective cushioning members _{6 and 62} to the first and the fixed dynamic core ₅ 1 second, _{5 2.} In the first embodiment and the third embodiment, it provided facing the first and second respective valve seat in the first and one second respective valve chamber _13, 13 ₂ of the upper, to the solenoid 9 The first and second valve bodies 2 ₁ and 2 ₂ may be seated on the first and second valve seats when energized. Further, in the second embodiment, the second valve chamber 13 _2, in addition to the second valve seat 14 ₂ of the top surface, the third valve seat of the lower surface is provided, upon energization of the solenoid 9, the second valve body 2 ₂ is spaced apart from the third valve seat, it may be a second valve chamber 13 ₂ is communicated with the second outlet port 12 ₂ through the holes opened in the third valve seat.

Further, the second inflow port 11 ₂ of the upstream gas supply channel of the twin solenoid valve of the third embodiment, in place of the proportional valve, and interposed a zero governor that pressure regulating the secondary gas pressure to the atmospheric pressure Also good. In the third embodiment, the first and second side passages 16 ₁ and 16 ₂ are provided to switch the airflow resistance of the first flow path for air and the second flow path for fuel gas between 2 and 2. Although it is a continuous electromagnetic valve, the first and second flow paths may be simply opened and closed without providing the side paths 16 ₁ and 16 ₂ . Furthermore, it is also possible to flow two types of fluids other than air and fuel gas through the first channel and the second channel.

DESCRIPTION OF SYMBOLS 1 ... Valve casing, 13 ₁ ... 1st valve chamber, 13 ₂ ... 2nd valve chamber, 14 ₁ ... 1st valve seat, 14 ₂ ... 2nd valve seat, 2 ₁ ... 1st valve body, 2 ₂ ... 2nd Valve body, 3 ₁ ... 1st movable iron core, 3 ₂ ... 2nd movable iron core, 4 ₁ ... 1st guide cylinder, 4 ₂ ... 2nd guide cylinder, 4a ... Open end, 5 ₁ ... 1st fixed iron core, 5 ₂ ... 2nd fixed iron core, 6 ₁ ... 1st buffer member, 6 ₂ ... 2nd buffer member, 7 ₁ ... 1st valve spring, 7 ₂ ... 2nd valve spring, 8 ₁ ... 1st frame, 8 ₂ ... 2nd Frame, 9 ... solenoid, H ... magnetic passage.

Claims (6)

First and second valve bodies, first and second movable iron cores connecting the first and second valve bodies to one end, and first and second movable iron cores from one open end. Are slidably inserted in the first and second guide tubes, and are arranged at the other end portions of the first and second guide tubes so as to face the first and second movable iron cores. Each of the first and second fixed iron cores and each of the first and second movable iron cores so as to absorb an impact when the first and second movable iron cores come into contact with the first and second fixed iron cores. Alternatively, the first and second buffer members provided in each fixed iron core, and the first and second urging members that move the first and second movable iron cores away from the first and second fixed iron cores. 2 each of the valve springs, a first frame arranged so as to connect the first and second fixed iron cores, and a second frame arranged so as to connect one end portions of the first and second guide cylinders. And the first guide tube And a single solenoid which is arranged so as to surround the one of the second guide tube,
A magnetic path is formed from the first movable iron core to the first movable iron core via the first fixed iron core, the first frame, the second fixed iron core, the second movable iron core, and the second frame. The first and second movable iron cores are sucked and moved toward the first and second fixed iron cores against the urging forces of the first and second valve springs, and the first and second valves. A dual solenoid valve characterized in that a body switching operation is performed.   The distance between the first fixed iron core or the first movable iron core and the first buffer member when the solenoid is not energized, and between the second fixed iron core or the second movable iron core and the second buffer member. The double solenoid valve according to claim 1, wherein the distance is different.   A first valve chamber that houses the first valve body and a second valve chamber that houses the second valve body are arranged in series within the valve housing, and the first valve chamber is not energized or energized. The first and second valve seats facing each of the first and second valve chambers, on which the first and second valve bodies are seated, are provided. valve.   A first valve chamber in which the first valve body is housed and a second valve chamber in which the second valve body is housed are arranged in parallel, and the first valve body can be seated in the valve housing. A first valve seat facing the second valve seat and a second valve seat facing the second valve chamber on which the second valve body can be seated, and when the solenoid is energized, both the first and second valve bodies are provided. One of the valve bodies is seated on the corresponding one of the first and second valve seats, and when the solenoid is de-energized, the other valve body of the first and second valve bodies is 3. The flow rate according to claim 1, wherein the flow rate is switched by energizing or de-energizing the solenoid by seating on the corresponding one of the first and second valve seats. Ream solenoid valve.   A first flow path in which a first valve chamber for housing the first valve body is interposed in a valve housing, and a second flow path in which a second valve chamber for storing the second valve body is interposed, Are arranged in parallel, and the first and second valve seats facing the first and second valve chambers are respectively seated when the solenoid is de-energized or energized. The dual solenoid valve according to claim 1 or 2, wherein different types of fluids are provided in the first flow path and the second flow path.   The dual solenoid valve according to any one of claims 1 to 5, wherein the first and second valve bodies have different diameters, and the solenoid is the first and second guides. A double solenoid valve, characterized in that it is arranged so as to surround a guide cylinder into which a movable iron core connected to a valve body having a large diameter is inserted.

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