JPH04300480A - Solenoid valve - Google Patents

Abstract

PURPOSE:To reduce impact noise by a plunger at the time of opening a valve for no generation of noise. CONSTITUTION:In this electromagnetic valve, there are provided a solenoid component body 61, a plunger 62 which is retracted by the excitation of the component body 61, a valve body 65 which is installed at the end part of the plunger 62, a spring 64 which always forces the plunger 62 in an advance direction, and a pad 63 which supports one end side of the spring 64 and stops the plunger 62 at its retract position. A protruding part 70 which comes into contact with a part of the solenoid component body 61 is constituted at a part of the valve body 65 immediately before the plunger 62 comes into contact with the pad 63.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, particularly a direct acting solenoid valve.

0002

2. Description of the Related Art Conventionally, in a direct-acting electromagnetic valve, when the valve is opened, a solenoid is excited, thereby retracting a plunger to which a valve body is attached, thereby opening a passage. The plunger is stopped by a pad, so that its retreating stop position is regulated.

0003

[Problems to be Solved by the Invention] However, with the above-mentioned conventional solenoid valve, the impact noise when the plunger hits the pad is large, so the solenoid valve may be opened and closed frequently.
There was a noise problem when a large number of solenoid valves were used.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a solenoid valve which eliminates the above-mentioned drawbacks of the conventional solenoid valve, reduces the impact noise caused by the plunger when the valve is opened, and does not generate noise.

[0005]

Means for Solving the Problems In order to achieve the above object, the solenoid valve of the present invention includes a solenoid structure, a plunger that is retracted by the excitation of the structure, and a solenoid valve that is attached to the tip of the plunger. A solenoid valve comprising a valve body, a spring that always biases the plunger in the advancing direction, and a pad that supports one end side of the spring and prevents the plunger from coming into contact with the retracted position, The valve body is characterized in that a protrusion that comes into contact with a part of the solenoid structure immediately before the plunger contacts the pad is formed as a part of the valve body.

[0006]

[Operation] When opening a solenoid valve, the plunger moves backward due to the excitation of the solenoid component, but just before the plunger hits the pad, the protrusion of the valve body first hits a part of the solenoid component. come into contact with The protrusion of the soft valve body hits first, creating a cushion, which weakens the impact force of the plunger that hits next, reducing impact noise.

[0007]

[Embodiment] Fig. 1 is a longitudinal cross-sectional view of a solenoid valve showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of a valve body portion, and Fig. 3 is a cross-sectional view of a valve body portion of a solenoid valve showing another embodiment. FIG. 4 is a plan view of the valve body portion shown in FIG. 3.

In FIGS. 1 and 2, a solenoid component 61 generates a magnetic force when energized to cause the plunger 62 in the inner hole to retreat (pull upward in the figure). Reference numeral 63 denotes a pad that prevents the plunger 62 from coming into contact with the retracted position, and is fixed within the inner hole of the solenoid structure 61 and is made of a rigid body such as hard resin. This pad 63
is a spring 64 interposed between the plunger 62 and
It supports one end of. The spring 64 always urges the plunger 62 in the advancing direction (downward in the figure). This urging force causes the valve body 65 attached to the tip of the plunger 62 to close the passage port 66. The valve body 65 is made of soft resin such as rubber. The solenoid structure 61 has a bobbin 68 forming its lower end surface that is connected to the O-ring 6.
It is fitted and fixed to the passageway opening structure 67 via 9.

[0009] The valve body 65 has a protrusion 70 on a surface opposite to the distal end surface (upper surface in the drawing). A plurality of these protrusions 70 are provided symmetrically on the same circumference. The height of the protrusion 70 is such that the protrusion 70 contacts the bobbin 68 of the solenoid structure 61 immediately before the plunger 62 contacts the pad 63. That is, at the time when the protrusion 70 contacts the bobbin 68, the height is such that there is still some gap between the plunger 62 and the pad 63. By setting the height of the protrusion 70 in this way, the protrusion 70 acts as a cushion and brakes the speed of the plunger 62. As a result, the collision force between the plunger 62 and the pad 63 is weakened, and the impact is reduced. Sound is reduced.

The protrusion provided on the valve body 65 may be a ring-shaped protrusion 71 as shown in FIGS. 3 and 4. When forming the ring-shaped protrusion 71, recesses 72 or grooves are provided at several locations on the upper surface of the protrusion 71 to prevent the protrusion 71 from sticking to the bobbin 78.

An example in which the solenoid valve of the present invention is applied to a bubble bath device with a hot water supply function will be explained with reference to FIG. 1 is a bathtub, 2
is a circulation circuit for circulating the hot water in the bathtub 1, and the circulation circuit 2 includes a non-self-priming pump 5 for forcedly circulating the hot water.
is provided. The flow path on the discharge side of the pump 5 is divided into a plurality of flow paths, for example, a back side flow path 33 and a foot side flow path 34, and a foam ejector 35 is provided at the end of each flow path, that is, at the bathtub discharge portion. It is being An air supply path 36 is connected to each of the foam ejectors 35 via a solenoid valve 37 according to the present invention.

Flow control valves 31 and 32 are provided in each of the flow paths 33 and 34, respectively, and a water level sensor 7 for detecting the water level in the bathtub 1 is provided in the foot side flow path 34. 4
is a reheating circuit branched from the discharge side of the pump 5 of the circulation circuit 2, which includes a bath heat exchanger 6 for heating hot water, a water flow switch 8 used for determining circulation, etc., and a water flow switch 8 for detecting the temperature of water in the bathtub 1. A self-priming pump 21 for flowing hot water through the thermistor 9 and the reheating circuit 4 is provided. The reheating circuit 4 is connected via a three-way valve 42 to a circuit 50 which is connected downstream of the flow control valve 31 in the back flow path 33 of the circulation circuit 2, and to an upstream side of the flow control valves 31 and 32. It is branched into a connected circuit 51. 3 is a hot water supply circuit for dropping hot water into the bathtub 1, and the hot water supply circuit 3 is connected to the bathtub 1 via a reheating circuit 4. The hot water supply circuit 3 is connected to a reheating circuit 4, and the hot water supply circuit 3 is branched into a hot water supply branch circuit 11 on the downstream side of the hot water supply heat exchanger 10. This hot water supply branch circuit 11 is connected to a shower, a stove, etc., and supplies hot water to these devices. On the upstream side of the hot water supply heat exchanger 10 of the hot water supply circuit 3, an incoming water flow rate sensor 12 for detecting the incoming water flow rate from city water and a thermistor 13 for water temperature detection are provided. 10 and the hot water supply branch circuit 11, there are provided a flow rate adjustment valve 14 for adjusting the flow rate of incoming water and a thermistor 15 for detecting the outlet temperature of the hot water supply heat exchanger 10. Further, 38 is a bypass path that connects the upstream side and the downstream side of the hot water heat exchanger 10, and the bypass path 38 is provided with a solenoid valve 39 that opens and closes according to the set value of a hot water temperature setting device (not shown). There is. Further, the hot water supply circuit 3 is provided with a drop flow rate sensor 17 for detecting the flow rate dropped into the bathtub 1, a vacuum breaker 18, a drop opening/closing valve 19 and a check valve 20 for opening and closing the hot water supply circuit 3. . 16 is a three-way valve provided in the hot water supply circuit 3 downstream of the check valve 20;
It branches a backwash circuit 30 connected to a filtration tank, which will be described later. 23 is a filtration circuit that branches from the pump 5 discharge side of the circulation circuit 2 and is connected to the pump 5 suction side, and a filtration tank 22 is interposed in the middle. A backwash drainage circuit 24 is branched from a location upstream of the filtration tank 22 via a three-way valve 26, and a backwash drainage circuit 24 is branched from a location downstream of the filtration tank 22 via a three-way valve 25. The circuits 30 are merged. The backwash circuit 30 includes a governor 27 for constant flow, a safety valve 40 for preventing water pressure higher than a specified water pressure from being applied to the filter tank, and a safety valve 40 for discharging water in the backwash circuit 30 to prevent freezing. A drainage channel 41 is provided, and a drain plug (not shown) is provided at the end of the drainage channel 41. The self-priming pump 21 provided in the reheating circuit 4 is driven when an increase in the output value of the pressure sensor 7 is detected while the on-off valve 19 is closed.

In the bubble bath operation, bath water is circulated into the bathtub 1 through the circulation circuit 2 and channels 33 and 34, while air is supplied through the solenoid valve 37 and the air supply pipe 36. , by ejecting aerated water from a foam ejector 35. If the sound when the electromagnetic valve 37 is opened is loud, it will be perceived as an unpleasant sound by bathers and the like, and will disrupt the relaxing atmosphere. Drop hot water into the bathtub 1 is performed by supplying hot water into the bathtub 1 from the hot water supply circuit 3 through the reheating circuit 4, the back side flow path 33, and the foot side flow path 34. Reheating of the bathtub 1 is performed by circulating the bathtub water through the circulation circuit 2, on the way to the bath heat exchanger 6, and then circulating through the flow paths 33 and 34 to the bathtub.

[0014]

Effects of the Invention According to the solenoid valve according to claim 1, the present invention has the above-described structure and operation.Just before the plunger hits the pad, the protrusion that comes into contact with a part of the solenoid component is removed from the valve body. Since the valve body is partially formed, the protrusion of the valve body acts as a cushion, weakening the collision force of the plunger against the pad, and reducing impact noise.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve showing an embodiment of the present invention.

FIG. 2 is a sectional view of a valve body portion.

FIG. 3 is a sectional view of a valve body portion of a solenoid valve showing another embodiment.

FIG. 4 is a plan view of the valve body portion shown in FIG. 3;

FIG. 5 is an overall configuration diagram showing an example in which the solenoid valve of the present invention is applied to a bubble bath device with a hot water supply function.

[Explanation of symbols]

61 Solenoid component 62 Plunger 63 Pad 64 Spring 65 Valve body 70 Protrusion 71 Protrusion

Claims (1)

[Claims] 1. A solenoid structure, a plunger that is retracted by excitation of the structure, a valve body attached to the tip of the plunger, and a spring that constantly biases the plunger in an advancing direction. A solenoid valve includes a pad that supports one end of the spring and prevents the plunger from coming into contact with the retracted position, the solenoid valve having a protrusion that comes into contact with a part of the solenoid structure immediately before the plunger hits the pad. 1. A solenoid valve, characterized in that a part is formed as a part of the valve body.