JP3352147B2 - Pilot type solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve.
Using electromagnetic force to perform a preliminary operation to open the valve,
The present invention relates to a pilot type solenoid valve in which a valve is opened by a pressure difference generated by the preliminary operation.

[0002]

2. Description of the Related Art As shown in FIG. 5, for example, as shown in FIG. 5, a pilot-operated solenoid valve of this type is connected to a high pressure side pipe line 52 of one side of a pressure operated valve 51 which is displaced by a difference in pressure applied to both sides. Each opening of the low-pressure side pipe 53 is arranged, and a pressure regulating chamber 54 is formed on the other surface side.
A leak hole 55 for constantly communicating the pressure control chamber 54 and the pressure control chamber 54, and a pilot hole 56 for communicating the low pressure side pipe 53 and the pressure control chamber 54 are formed in the pressure operated valve 51.

When the pilot hole 56 is opened and closed by an electromagnetic valve 57, the pressure in the pressure regulating chamber 54 changes and the pressure actuating valve 51 is displaced, and the high pressure side pipe 52 and the low pressure side pipe 53
It opens and closes between. 58 is an electromagnetic coil.

[0004]

In the conventional pilot type solenoid valve as described above, the pilot hole 56 is formed in a direction perpendicular to the direction of displacement of the pressure actuated valve 51, and is opposed to the mouth opening. The solenoid valve 57 moves forward and backward to open and close the pilot hole 56.

[0005] Therefore, a force (displacement force) for displacing the pressure actuated valve 51 acts on the solenoid valve 57, and the force required to fully close the pilot hole 56 varies depending on the time, for example, 0 to 50 g. Variations occur in the range of the degree.

As a result, the opening degree of the pressure operated valve 51 does not correspond to the value of the current flowing through the electromagnetic coil 58, and accurate flow control (proportional control) cannot be performed. It could only be used as a valve.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pilot type solenoid valve which can be used easily and can control a flow rate corresponding to a current value flowing through an electromagnetic coil of the solenoid valve.

[0008]

In order to achieve the above object, a pilot type solenoid valve according to the present invention is provided with a high pressure side pipe line toward one surface of a pressure operated valve which is displaced by a difference in pressure applied to both surfaces. A leak hole, which forms a pressure regulating chamber on the other surface side and constantly communicates the low pressure side pipeline and the pressure regulating chamber, and a high pressure side pipeline. And a pilot hole for communicating the pressure control chamber with the pressure control chamber. An electromagnetic drive constant for adjusting the pressure difference between the pressure in the high-pressure pipe and the pressure in the pressure control chamber to an arbitrary constant value is formed. The pilot hole is opened and closed by a differential pressure valve.

[0009] A hot water pipe to which hot water is supplied and a cold water pipe to which cold water is supplied are connected so as to communicate with a common mixing pipe, so that the hot water pipe and the cold water pipe are connected between the hot water pipe and the mixing pipe. The pilot type solenoid valve may be provided between the mixing pipe and the mixing pipe to form a hot water supply temperature adjusting device of the hot water supply apparatus.

[0010]

The differential pressure between the pressure in the high-pressure line and the pressure in the pressure regulating chamber is maintained at an arbitrary constant value by the constant differential pressure valve, and the opening of the pressure-operated valve becomes substantially constant in accordance with the differential pressure. That is, the flow rate from the high-pressure pipe to the low-pressure pipe is maintained substantially constant.

When the electromagnetic force applied to the constant differential pressure valve is changed, the differential pressure between the pressure in the high pressure side pipe and the pressure in the pressure regulating chamber changes, and the opening of the pressure operated valve is changed. And the flow rate from the high-pressure side line to the low-pressure side line changes.

[0012]

An embodiment will be described with reference to the drawings. FIG.
1 shows a first embodiment in which a pilot-type solenoid valve of the present invention is applied to a hot water supply temperature adjusting device of a hot water supply apparatus, in which a hot water pipe 1 to which hot water is supplied and a cold water pipe 2 to which cold water is supplied are each provided with a pressure. The piping is connected so as to communicate with the common mixing pipe 3 via the operation valve 10.

Here, since the pressure in the hot water pipe 1 and the pressure in the cold water pipe 2 are both higher than the pressure in the mixing pipe 3, the hot water pipe 1 and the cold water pipe 2 are connected to the high pressure side lines 1, 2 and the mixing pipe 3. Can be referred to as a low-pressure side line 3.

The pressure-operated valve 10 is formed by a thin rubber diaphragm 11 and a plastic or metal disk 12 provided in close contact with the valve seat portion 11a, and is applied to both upper and lower surfaces in the figure. It is displaced up and down due to the pressure difference.

The disk 12 has a central projection penetrating the central portion of the diaphragm 11, and the diaphragm 11 is fitted into a concave portion at the base of the disk 12 and is integrally fixed. Reference numeral 15 denotes an auxiliary spring that urges the pressure-operated valve 10 in a closing direction.

The inlet of the low-pressure line 3 is connected to each pressure-operated valve 10
The outlets of the high-pressure-side pipes 1 and 2 open in a donut shape toward the back surface of the pressure-operated valve 10. The valve seat 4 that separates the high-pressure pipes 1 and 2 from the low-pressure pipe 3 is in close contact with the valve seat 11 a of the diaphragm 11.

On the front side of the pressure actuated valve 10, a closed pressure regulating chamber 5 is formed. However, the high pressure side pipelines 1, 2
Pilot holes 16 and 17 are formed to communicate the pressure control chamber 5 with the pressure control chamber 5. A leak hole 13 is provided at the center of the disk 12 for constantly communicating the low-pressure pipe 3 with the pressure regulating chamber 5.
Is formed.

Reference numerals 20 and 20 denote a pair of electromagnetically driven constant differentials for maintaining the pressure difference between the pressure in the two pressure regulating chambers 5 and the pressure in the hot water pipe 1 or the cold water pipe 2 at an arbitrary constant value. Pressure valve,
The pilot holes 16 and 17 are set so that each differential pressure becomes constant.
Open and close.

Each of the constant differential pressure valves 20 has a structure in which a valve body 22 made of, for example, rubber is attached to the tip of a movable iron core 21 of an electromagnetic solenoid. The thrust applied to 21 changes, and the differential pressure can be controlled to an arbitrary constant value. 24 is a communication passage 16,
This is a coil spring that biases the movable iron core 21 in a direction to close the movable iron core 17.

In this embodiment, when a large current is passed through the electromagnetic coil 23 to open the pilot holes 16 and 17, the pressure in the pressure regulation chamber 5 and the high pressure side pipe 1 or Since there is no pressure difference between the pressure and the pressure in 2, the pressure-operated valve 10 is closed, and the flow rate flowing into the low-pressure line 3 becomes zero.

When the value of the current flowing through the electromagnetic coil 23 is reduced, the openings of the pilot holes 16 and 17 and the valve
Is narrowed, and the pressure in the pressure regulation chamber 5 is correspondingly reduced. Then, as shown in FIG. 2, the pressure difference between the pressure in the pressure regulation chamber 5 and the pressure in the high pressure side pipeline 1 or 2 increases, and the pressure actuating valve 10 opens correspondingly, and the low pressure side The flow rate flowing into the conduit 3 gradually increases.

Therefore, by changing the value of the current flowing through the electromagnetic coil 23 of each of the constant differential pressure valves 20, 20, the flow rate can be controlled for each of the pressure actuated valves 10, 10 in accordance with the current value. The hot water supply temperature sent out from the mixing pipe 3 can be controlled by arbitrarily changing the mixing ratio of the hot water and the cold water.

FIG. 3 shows a second embodiment of the present invention, in which a valve portion 117 of a pressure-operated valve 110 provided on the chilled water pipe 2 side.
Is arranged in a mixing section of hot water and cold water, and the mixing ratio of cold water sent through the cold water pipe 2 and hot water sent at a controlled flow rate from the hot water pipe 1 through the pressure actuated valve 10 is Cold water pipe 2
The hot water supply temperature is controlled by controlling the pressure operating valve 110 on the side.

Reference numeral 113 denotes a leak hole for communicating the inside of the pressure regulating chamber 105 on the side of the cold water pipe 2 with the inside of the mixing pipe 3. The leak hole 113 changes the value of the current flowing through the electromagnetic coil 123 of the constant pressure differential valve 120 on the side of the cold water pipe 2. Thereby, the operation of the pressure operated valve 110 is controlled in the same manner as in the first embodiment, and as shown in FIG. 4, the hot water supply temperature can be controlled correspondingly.

[0025]

According to the pilot type solenoid valve of the present invention,
Since the displacement force of the pressure-operated valve does not affect the opening and closing of the pilot hole, the opening of the pressure-operated valve is determined according to the current flowing through the electromagnetic coil, and accurate flow control corresponding to the current flowing It can be performed.

By using the pilot-type solenoid valve for the hot water supply temperature adjusting device of the hot water supply device, the hot water supply temperature can be adjusted by freely changing the mixing ratio of hot water and cold water.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 is a side sectional view of a second embodiment.

FIG. 4 is an operation explanatory diagram of the second embodiment.

FIG. 5 is a side sectional view of a conventional pilot type solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water pipe 2 Cold water pipe 3 Mixing pipe 5 Pressure control chamber 10 Pressure operated valve 13 Leak hole 16, 17 Pilot hole 20 Constant differential pressure valve 23 Electromagnetic coil

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/42 F16K 17/22

Claims (2)

(57) [Claims] 1. A pressure-operated valve which is displaced by a difference in pressure applied to both surfaces thereof, each opening of a high-pressure side line and a low-pressure side line is arranged toward one surface, and a pressure regulating valve is arranged on the other surface side. defining a chamber, formed a leak hole which always communicates the said low-pressure side conduit and the pressure regulating chamber and a pilot hole for communicating the said high pressure side pipe and the pressure regulating chamber, the high-pressure An electromagnetically driven constant pressure differential valve that adjusts the pressure difference between the pressure in the side pipeline and the pressure in the pressure regulation chamber to an arbitrary constant value is installed separately from the pressure operated valve.
In addition, the pilot hole is opened and closed by the constant differential pressure valve. 2. A hot water pipe (1) provided with a hot water pipe (1) to which hot water is supplied and a cold water pipe (2) to which cold water is supplied so as to communicate with a common mixing pipe (3). And the mixing pipe (3) and the cold water pipe (2) and the mixing pipe (3)
A hot water supply temperature adjusting device for the hot water supply device, wherein the pilot type solenoid valve is provided between the hot water supply device and the pilot type solenoid valve.