JPH0517285U - Motorized valve - Google Patents

Abstract

(57) [Summary] [Purpose] In an electrically operated valve in which the valve is operated by electrical means, the auxiliary valve is opened by turning on / off the energization without using an electromagnet that is heavy and generates a magnetic field. A motor-operated valve that opens and closes the main valve is obtained by operating the closing valve and operating the auxiliary valve. An auxiliary valve 53 facing an auxiliary valve valve seat 52 provided on a diaphragm 2 is supported by an operating member 7 provided inside a guide tube portion 32 connected to the pressure chamber case 30, and is connected to the operating member 7. The operating rod 71 for
A metal spring 8 that extends due to a temperature rise is interposed between the protruding end and the pressure chamber case 30, and the metal spring 8 extends and contracts. It is controlled by a temperature raising means that switches between heat generation and cooling by turning the power on and off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to an improvement of a motor-operated valve in which the operation of a valve for turning on / off a fluid flow is performed by an electric means.

[0002]

[Prior Art]

 There are two types of motor-operated valves that open and close the valve body by electrical means, such as the one that opens and closes the valve by operating the motor or electromagnet by energization, and the one that heats the wax thermoelement etc. by energization. There is a form in which a dynamic actuator is operated to open and close the valve.

[0003] The type using a motor or an electromagnet has problems that it becomes large and expensive, and a motor-operated valve of a type using a thermal actuator is a cheap valve valve. However, since the thermal actuator directly opens and closes the valve, there is a problem that the opening and closing of the valve is slow.

From this, a bypass motor operated valve has been developed in which an auxiliary valve provided in a bypass passage is moved by the operation of an electromagnet, and the main valve is opened by the opening operation of the auxiliary valve.

As shown in FIG. 1, this bypass type motor-operated valve A has an upper surface of a valve box 1 including a primary-side pipeline 10 a communicating with an inlet 10 and a secondary-side pipeline 11 a communicating with an outlet 11. On the side, the pressure chamber 3 partitioned by the diaphragm 2 is provided for the flow path 12 from the primary side conduit 10a to the secondary side conduit 11a, and on the lower surface side of the axial core portion of the diaphragm 2, The main valve 4 facing the annular main valve seat 40 provided at the inlet of the secondary conduit 11a is provided, and the peripheral portion of the diaphragm 2 communicates with the primary conduit 10a of the flow passage 12. A bypass inlet hole 50 that communicates the primary-side conduit 10a with the pressure chamber 3 is formed in a portion corresponding to the above, and a portion corresponding to the center of the annular main valve seat 40 at the axial center portion of the diaphragm 2. And a bypass outlet hole that connects the secondary side conduit 11a and the pressure chamber 3 to each other. 51 is provided with a diameter larger than that of the bypass inlet hole 50, an auxiliary valve valve seat 52 is provided at the periphery of the opening portion of the bypass outlet hole 51 on the pressure chamber 3 side, and the upper surface side of the pressure chamber 3 is energized. A rod-shaped movable iron piece 61 in which an electromagnet 6 excited by the above is assembled, and an auxiliary valve 53 corresponding to the auxiliary valve valve seat 52 is provided on the lower end surface in a core 60 formed in a closed cylindrical shape of the electromagnet 6. Is vertically slidably fitted and biased by a spring 62 so as to be pushed downward from the inside of the core 60.

As a result, when the electromagnet 6 is not energized and therefore the rod-shaped movable iron piece 61 is pushed downward by the spring 62 and the auxiliary valve 53 closes the auxiliary valve valve seat 52, The pressure in the pressure chamber 3 becomes the same as the pressure in the primary side pipe line 10a due to the pressure flowing from the primary side pipe line 10a into the pressure chamber 3 via the bypass inlet hole 50, and Due to the difference between the pressure receiving area S1 on the wide upper surface side of the diaphragm 2 and the pressure receiving area S2 on the lower surface side of the diaphragm 2 narrowed by the annular main valve seat 40, the diaphragm 2 is pushed downward and The main valve 4 will be in the state which closed the main valve seat 40. Further, when the rod-shaped movable iron piece 61 is pulled up against the bias of the spring 62 by energizing the electromagnet 6, the auxiliary valve 53 is separated upward from the auxiliary valve valve seat 52, and the auxiliary valve valve seat 52 is By opening, the water in the pressure chamber 3 flows out to the secondary side from the bypass outlet hole 51, and the pressure in the pressure chamber 3 becomes lower than the pressure on the primary side, and the pressure P1 on the primary side and the pressure receiving area. When the product of S2 becomes larger than the product of the pressure P2 on the secondary side and the pressure receiving area S 1, the diaphragm 2 is pushed up, whereby the main valve 4 separates from the main valve seat 40 and opens. The water on the primary side flows to the secondary side.

[0007]

[Problems to be solved by the device]

 The above-mentioned bypass valve type electric valve opens the auxiliary valve 53 by the operation of the electromagnet 6, thereby lowering the pressure of the pressure chamber 3, and moving the diaphragm 2 by the pressure on the primary side to operate the main valve 4. Since the valve opening operation is performed, the electromagnet 6 for moving the movable iron piece 61 can be made relatively small.

However, since the electromagnet 6 itself formed by winding the copper wire around the coil becomes heavy, the firm bracket 6 a for supporting the electromagnet 6 and the outer surface side of the pressure chamber 3 in the valve box 1 are supported. In addition, since it is necessary to mount a strong assembly seat 1a for assembling the bracket 6a, there is a problem in that the whole becomes large and heavy. Further, when the electromagnet 6 is operated to move the movable iron piece 61 by energization, a magnetic field is created in the surroundings, which causes a problem of affecting electric devices arranged in the periphery.

The present invention has been made in order to solve these problems occurring in the conventional means, and the operation of opening and closing the auxiliary valve by turning on and off the energization without using an electromagnet. The purpose of the invention is to provide a new means by which the main valve is opened / closed by its operation, so that a lightweight, small-sized motorized valve that does not generate a magnetic field can be obtained. .

[0010]

[Means for Solving the Problems]

 And, as a means for achieving the above-mentioned object, the present invention provides a valve box with a pressure separated by a diaphragm with respect to a flow path communicating between a primary side pipeline and a secondary side pipeline therein. A chamber is provided, and the diaphragm is provided with a bypass inlet hole communicating with the primary side pipeline and a bypass outlet hole communicating with the secondary side pipeline, and the side facing the flow path of the diaphragm. Is equipped with a main valve facing the annular main valve seat provided at the inlet of the secondary side pipe, and the auxiliary valve is provided around the opening of the bypass outlet hole on the side facing the pressure chamber of the diaphragm. A valve seat for the valve is provided, and the operating member supporting the auxiliary valve facing the valve seat for the auxiliary valve is stored in the guide cylinder part provided in the pressure chamber case, and is directed to the valve seat for the auxiliary valve by the spring. The actuating rod provided on the actuating member is urged to keep the watertightness outside the guide tube. A metal spring that expands when the temperature rises is interposed between the protruding end and the pressure chamber case. It proposes an electrically operated valve that is controlled by a temperature raising means that switches to and.

[0011]

【Example】

 Next, embodiments will be described in detail with reference to the drawings. The same reference numerals are used for the constituent members having the same effects as those of the conventional ones.

FIG. 2 is a vertical sectional front view of a motor-operated valve A embodying the present invention. In FIG. 2, 1 is a valve box, 2 is a diaphragm, 3 is a pressure chamber, 4 is a main valve, 40 is a main valve seat, Reference numeral 52 is an auxiliary valve seat, 53 is an auxiliary valve, 7 is an operating member for moving the auxiliary valve 53, 8 is a metal spring, 80 and 81 are electrode plates, and PTC is a positive temperature coefficient thermistor.

The valve box 1 is provided with a conduit 10a on the primary side having an inlet 10 at one end and a conduit 11a on the secondary side having an outlet 11 at the other end, and these conduits 10a and 11a are provided. A flow path 12 is provided on the upper surface side, the peripheral portion of the flow path 12 is communicated with the primary side conduit 10a, and the axial center portion is provided in the inlet of the secondary side conduit 11a. The diaphragm 2 and the pressure chamber case 30 are assembled on the upper surface side of the flow passage 12 via the main valve seat 40 so as to be separated from the flow passage 12 by the diaphragm 2. It is assembled by mounting the pressure chamber 3. Further, the diaphragm 2 thereof is provided with a bypass inlet hole 50 for allowing the pressure chamber 3 to communicate with the conduit 10a on the primary side through the flow passage 12 at the peripheral portion, and the pressure chamber 3 is provided at the shaft core portion. A bypass outlet hole 51 for communicating with the secondary side conduit 11a through the inner hole of the annular main valve seat 40 is formed to have a diameter larger than that of the bypass inlet hole 50. Further, the diaphragm 2 is also provided with a main valve 4 facing the annular main valve seat 40 provided at the inflow port of the flow passage 12 on the secondary side at the axial center portion on the lower surface side thereof. A valve seat 52 for an auxiliary valve is provided in the axial center portion on the upper surface side so as to form the edge of the opening of the bypass outlet hole 51 to the pressure chamber 3 side.

The pressure chamber case 30 forming the pressure chamber 3 also serves as an assembling means for assembling the diaphragm 2, and is provided at the upper end of the peripheral wall of the flow passage 12 formed on the upper surface side of the valve box 1. A mounting flange portion 31 that abuts with the flange-shaped mounting seat 1a is formed on the peripheral edge on the lower end side. The mounting flange portion 31 abuts on the flange-shaped mounting seat 1a and is closed by a set bolt. At the same time, the peripheral edges of the diaphragm 2 are clamped when they are fitted together.

A guide tube portion 32, which communicates with the pressure chamber 3 and rises upward, is integrally and continuously formed at an axial center portion on the upper surface side of the pressure chamber case 30. An operating member 7 having an auxiliary valve 53 facing the above-mentioned auxiliary valve valve seat 52 on the lower end surface is housed in the portion 32 in a vertically movable manner, and is biased by a spring 70 so as to be pushed downward. The actuating member 7 is provided with an actuating rod 71 that projects upwards for a long time. The actuating rod 71 keeps watertightness and penetrates the ceiling wall of the guide tubular portion 32, and the upper end portion thereof is guided by the guide tubular portion 32. Is projected above. A metal spring 8 wound in a coil shape is provided between the projecting end of the operating rod 71 and the upper surface of the pressure chamber case 30.

The metal spring 8 is formed by laminating two kinds of metal materials having different coefficients of thermal expansion so as to extend in the axial direction of the coil when the temperature rises. It may be formed of a memory alloy that extends to a pre-stored length.

A means for raising the temperature of the metal spring 8 is provided so as to extend. This temperature raising means is, of course, a means that is controlled by turning on / off the energization, and is a normal electric heater, or it is heated by energization and the electric resistance increases, so that the temperature rises to a certain temperature. An element such as a positive temperature coefficient thermistor PTC may be used. These elements are arranged in contact with the periphery or the outer peripheral surface of the metal spring 8 and the metal spring 8 is controlled by turning on / off the power supply to the temperature raising means. Be sure to extend and contract.

Further, the temperature raising means may cause a current to flow through the metal spring 8 itself and raise the temperature by heat generated by its electric resistance. The embodiment shown in FIG. 2 is such an example, and the metal spring 8 is an electrode plate provided on the lower surface side of the spring receiver 72 provided at the protruding end of the operating rod 71 at both ends of the coil thereof. 80 and the electrode plate 81 provided on the upper surface of the pressure chamber case 30 are brought into contact with each other, and current is applied between the terminal electrodes 82 and 83 which are respectively connected to the electrode plates 80 and 81, so that a current flows in the metal spring 8. When the metal spring 8 flows, the metal spring 8 is heated by the electric resistance of the metal at that time.

At this time, when the pressure chamber case 30 is not formed of a synthetic resin material serving as an insulating material but is formed of a metal material, an insulating material is provided between the electrode plate 81 and the upper surface of the pressure chamber case 30. Is installed. Further, when the spring receiver 72 provided on the projecting end portion of the operating rod 71 is formed of a metal material instead of a synthetic resin material which is an insulating material, the space between the electrode plate 80 and the spring receiver 72 is similarly formed. An insulating material is interposed in the.

The positive temperature coefficient thermistor PTC is an electric circuit between the terminal poles 82 and 83 in order to prevent a large current from flowing through the metal spring 8 when the metal spring 8 itself is energized to raise the temperature of the metal spring 8. The element, whose resistance increases as the temperature rises inside, is arranged at a position adjacent to the metal spring 8 so that the metal spring 8 is heated by the heat generated by energizing the element.

Reference numeral 9 denotes a cap which covers the outer periphery of the metal spring 8 described above, which is formed of a synthetic resin material and is assembled and fixed to the upper surface of the pressure chamber case 30. The cap 9 may be formed of a thin metal plate.

[0022]

[Action]

 The embodiment apparatus configured as described above operates as follows. When the metal spring 8 itself or the temperature raising means around the metal spring 8 is not energized, the operating member 7 is pushed down by the spring 70, and the auxiliary valve 53 supported on the lower end surface of the operating member 7 assists. By pressing the valve seat 52 for valve and closing the valve seat 52 for auxiliary valve, the pressure in the pressure chamber 3 becomes the same as the pressure in the flow passage 12, and the lower surface side of the diaphragm 2 facing the flow passage 12 The diaphragm 2 is pushed down due to the difference between the pressure receiving area of the diaphragm 2 and the pressure receiving area of the upper surface facing the pressure chamber 3, and accordingly, the main valve 4 provided on the lower surface of the diaphragm 2 closes the main valve seat 40. Held in a state.

Next, when the temperature of the metal spring 8 is raised by energizing the heat retaining means arranged in the metal spring 8 itself or in the vicinity thereof, the bimetal 8 extends in the axial direction of the coil. As a result, the operating member 7 is lifted up against the bias of the spring 70, and the auxiliary valve 53 supported on the lower surface of the operating member 7 is lifted upward from the auxiliary valve valve seat 52, and the bypass outlet hole 51 is opened. Open. Then, the water in the pressure chamber 3 flows out to the pipeline 11a on the secondary side, so that the pressure in the pressure chamber 3 becomes lower than the pressure on the primary side, and the diaphragm 2 is pushed up. A state in which the valve 4 is separated from the main valve seat 40, the inlet of the secondary-side conduit 11a formed on the inner cavity side of the main valve seat 40 is opened, and the water on the primary side flows to the secondary side. Becomes

[0024]

[Effect of the device]

 As described above, in the motor-operated valve according to the present invention, the actuating member 7 supporting the auxiliary valve 53 is connected to the metal spring 8 extending by the temperature rise, and the metal spring 8 is heated by the temperature raising means for raising the temperature. Since the auxiliary valve 53 is operated to be heated and moved to the position where the auxiliary valve 53 is opened, the auxiliary valve 53 is turned on and off by energization without turning on the magnet stone that generates a magnetic field. The motorized valve that opens and closes the main valve can be obtained by opening and closing the valve.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a conventional motor-operated valve.

FIG. 2 is a vertical sectional front view of an electric valve according to the present invention.

[Explanation of symbols]

A ... Motorized valve, 1 ... Valve box, 1a ... Assembly seat, 10 ... Inlet, 1
0a ... pipe, 11 ... exit, 11a ... pipe, 12 ... flow path,
2 ... diaphragm, 3 ... pressure chamber, 30 ... pressure chamber case,
31 ... Mounting collar portion, 32 ... Guide tubular portion, 4 ... Main valve, 40 ...
Main valve seat, 50 ... Bypass inlet hole, 51 ... Bypass outlet hole, 52 ... Auxiliary valve valve seat, 53 ... Auxiliary valve, 6 ... Electromagnet,
6a ... Bracket, 60 ... Core, 61 ... Movable iron piece, 62
... Spring, 7 ... Actuating member, 70 ... Spring, 71 ... Actuating rod, 7
2 ... Spring receiver, 8 ... Metal spring, 80/81 ... Electrode plate,
82, 83 ... Terminal pole, 9 ... Cap.

Claims (3)

[Scope of utility model registration request] 1. A valve box (1) having a conduit (1) on the primary side inside thereof.
0a and the conduit 11a on the secondary side are provided with a pressure chamber 3 separated by a diaphragm 2 in a flow passage 12 that communicates with a conduit 10a on the primary side and a bypass inlet hole 50 that communicates with the bypass inlet hole 50. A bypass outlet hole 51 communicating with the pipeline 11a on the next side is provided, and the flow path 1 of the diaphragm 2 is provided.
2 is provided with a main valve 4 facing the annular main valve seat 40 provided at the inlet of the secondary side pipeline 11a on the side facing the second side, and the bypass is provided on the side facing the pressure chamber 3 of the diaphragm 2. An auxiliary valve valve seat 52 is provided around the opening of the outlet hole 51, and the operating member 7 supporting the auxiliary valve 53 facing the auxiliary valve valve seat 52 is provided in the pressure chamber case 30. Three
2 and the spring 70 urges it toward the valve seat 52 for the auxiliary valve, and the operating rod 71 provided on the operating member 7 is projected outside the guide tube portion 32 while keeping it watertight. A metal spring 8 that expands due to a temperature rise is interposed between the portion and the pressure chamber case 30, and the expansion and contraction of the metal spring 8 is switched between heat generation and cooling by turning on and off the electricity. An electrically operated valve that can be controlled by a heating means. 2. The motor-operated valve according to claim 1, wherein the temperature raising means is configured to supply a current to the metal spring 8 itself when the energization is turned on and heat the metal spring 8 itself by the electric resistance of the current to raise the temperature. 3. A circuit for supplying an electric current to the metal spring 8 itself,
The positive temperature coefficient thermistor PTC is connected, and the positive temperature coefficient thermistor PTC is disposed in the vicinity of the metal spring 8.
Motorized valve described.