JPH02590B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a so-called closing-hand type solenoid valve, which has a relatively large diameter and whose valve body is biased toward the valve seat in the closing direction by the flow of fluid, and in particular, the magnetic force generated in the coil when the solenoid coil is energized. This invention relates to a direct-acting type electromagnetic valve that opens when energized and directly opens a valve body. Generally, when the valve seat has a relatively large diameter, the force of the fluid that acts to close the valve body is relatively large, and therefore a large magnetic force (attractive force) from the electromagnetic coil is required to open the valve. . Therefore, the larger the diameter of the electromagnetic valve, the sharper the power consumption and the larger the coil. However, in general, the relationship between the attraction force and power consumption of an electromagnetic coil is a parabolic curve as shown in Figure 1, and the increasing curve of the coil attraction force tends to plateau as the electromagnetic coil becomes larger, which means the power consumption increases. becomes. The reason for this is that the loss of electrical energy due to iron loss in the magnetic circuit around the electromagnetic coil increases. The purpose of the present invention is to use the fluid pressure upstream of the valve as the valve opening force without increasing the size of the electromagnetic coil of a large-diameter direct-acting electromagnetic valve, thereby reducing the size of the electromagnetic coil and reducing power consumption. There is to get a solenoid valve. The solenoid valve of the present invention has a valve body disposed on the upstream side of the fluid flow path so as to face and block a valve seat disposed in a fluid flow path in a valve housing, and the valve body is moved by a magnetic force generated in an electromagnetic coil. In the electromagnetic valve, the solenoid valve is driven by a fluid flow path to open the fluid flow path, and a side flow path is branched from the fluid flow path downstream of the valve body, and the fluid flowing into this side flow path is directed to the valve body. The fluid is ejected through a nozzle toward the downstream end face of the fluid, and further an auxiliary solenoid valve is provided for opening the side flow path, and when opening the fluid flow path, the solenoid coil and the coil of the auxiliary solenoid valve are simultaneously energized. It is characterized by Embodiments of the present invention will be described below with reference to the drawings. In the present invention, as shown in FIG.
A valve seat 3 is disposed in the fluid passage 2 of the valve seat 3, and a valve body 4 disposed on the upstream side of the fluid passage 2 so as to face and block the valve seat 3 is applied to the magnetic force generated in the first electromagnetic coil 5. In addition, a side flow path 6 is branched from the fluid flow path on the upstream side of the valve body 4, and the fluid flowing into this side flow path 6 is driven to open the fluid flow path 2. The fluid is ejected toward the downstream end surface 7 of the valve body 4 (the lower surface of the valve body 4 in FIG. 2) through the nozzle 8, and furthermore, the fluid flow path from the side flow path 6 to the nozzle 8 is opened. A second solenoid valve 9 is provided, and a coil 10 of the second solenoid valve 9 and the first solenoid valve 9 are provided.
The electromagnetic coil 5 and the switch 1 are connected to the power source 11.
2 in parallel. Since the solenoid valve of the present invention has the above configuration, the valve closing force of the solenoid valve is P ₁ ×π/4D ² (where P ₁ is the fluid pressure in the fluid flow path 2, and D is the opening diameter of the valve seat 3. ), and the valve opening force is F ₂ + F ₃ (here, F ₃ = P ₂ π/4d ² , F ₂ is the attraction force of the first electromagnetic coil 5, and P ₂ is the attraction force of the nozzle 8
The ejection pressure applied to the valve body 4 from the nozzle 8, d is
). As is clear from the characteristic curve of FIG. 1, the power consumption of the second electromagnetic valve 9 for applying the force F ₃ as a fluid force is only a small amount of W ₃ . This is because the force F ₃ hits the lower part of the parabolic curve, ie the part of the steeply rising curve. That is, if the valve opening force were to be obtained entirely by the force F ₁ of a single electromagnetic coil as in the past, the power consumption would be W ₁ as shown in FIG. 1, so according to the present invention, (W ₁ −
W ₄ ) (here, W ₄ is the sum of the power consumption W ₃ and the power consumption W ₂ corresponding to the force F ₂ ). This is shown in the table below.

[Table] In the present invention, the distance H between the tip of the nozzle 8 and the downstream end surface 7 of the valve body 4 when the valve body 4 is seated on the valve seat 3 is preferably H<d/4. . In other words, the flow rate of fluid ejected from the nozzle is the cross-sectional area x flow velocity, so if the flow velocity is kept constant and the cross-sectional area ratio is πdH<π/4d ² ∴H<1/4d, the fluid pressure acting on the valve body is ensured. be able to. Further, in the present invention, the side flow passage 6 and the second solenoid valve 9 may be formed inside the valve housing 1, and both the side flow passage 6 and the second solenoid valve, or only the side flow passage 6 may be formed inside the valve housing 1. It may be placed outside. Furthermore, the electromagnetic valve may be for either alternating current or direct current, and the fluid may be either compressible fluid or incompressible fluid. As mentioned above, according to the solenoid valve of the present invention, the power consumption of the electromagnetic coil for driving the valve body can be significantly reduced by the fluid pressure in the fluid flow path, the electromagnetic coil can be made smaller, and its reliability can also be improved. There is.

[Brief explanation of drawings]

FIG. 1 is a characteristic curve diagram showing the relationship between attraction force and power consumption of a solenoid valve, and FIG. 2 is a sectional view of the solenoid valve of the present invention. 1... Valve housing, 2... Fluid flow path, 3... Valve seat,
4... Valve body, 5... Electromagnetic coil, 6... Side flow path,
7... Downstream end face, 8... Nozzle, 9... Solenoid valve, 10... Coil, 11... Power source, 12... Switch.

Claims (1)

[Claims] 1. A valve body is disposed on the upstream side of a fluid flow path so as to face and block a valve seat disposed in a fluid flow path in a valve housing, and this valve body is moved by a magnetic force generated in an electromagnetic coil. In the electromagnetic valve, the solenoid valve is driven by a fluid flow path to open the fluid flow path, and a side flow path is branched from the fluid flow path upstream of the valve body, and the fluid flowing into this side flow path is directed to the valve body. The fluid is ejected through a nozzle toward the downstream end face of the fluid, and further an auxiliary solenoid valve is provided for opening the side flow path, and when opening the fluid flow path, the solenoid coil and the coil of the auxiliary solenoid valve are simultaneously energized. A solenoid valve characterized by: 2. A patent claim in which H<d/4, where d is the inner diameter of the nozzle, and H is the distance between the nozzle opening end face and the downstream end face of the valve body when the valve body is seated on the valve seat. The solenoid valve described in item 1. 3. The electromagnetic valve according to claim 1, wherein both the side flow path and the auxiliary electromagnetic valve are disposed within the valve housing. 4. The solenoid valve according to claim 1, wherein either or both of the side flow path and the auxiliary solenoid valve are arranged outside the valve housing.