JPH10132134A - Reversible solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a passage structure by reversibly communicating both main passages by the opening or closing operation of a single main valve body, and to increase the flow rate by reducing pressure loss of fluid. SOLUTION: A valve chamber 38 on which a main valve port for comminuting a pair of main passages 36, 37 with each other is formed is provided on a valve main body 30. Shuttle valve ports 44, 45 are formed on both ends of a pilot inflow passage 43 whose both ends are communicated with both main passages 36, 37. A control valve port 53 is formed on a control passage communicated with the pilot inflow passage 43 through the back pressure side of the main valve chamber 38. A pair of pilot outflow passages 60, 61 to be communicated with a pair of main passages 36, 37 from respective control passages through check valve ports to be opened or closed by the check valve bodies are provided. A main valve body for blocking the main valve port by a spring 75 is provided on the main valve chamber 38. Shuttle valve bodies for opening or closing the shuttle valve ports 44, 45 on both ends of the pilot inflow passage 43 are so provided as to be freely slid. A control valve body to be operated by an electromagnetic device and for opening or closing the control valve port 53 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible solenoid valve incorporated in, for example, a refrigeration cycle system for controlling fluid flowing in forward and reverse directions.

[0002]

2. Description of the Related Art A structure of this type of conventional reversible solenoid valve is known from Japanese Patent Application Laid-Open No. 5-99366. As shown in FIG. 7, this reversible solenoid valve has a valve body 1
A pair of main passages 3 and 4 which are opened at the bottom surface and communicate with the main valve chamber 2 are formed, and main valve ports 5 and 6 are formed at the communication portions between the two main flow paths 3 and 4 and the main valve chamber 2 respectively. And this main valve port 5,
A pair of main valve bodies 7 and 8 for opening and closing the main valve body 6 are slidably provided in the main valve chamber 2, and the main valve ports 5 and 6 are closed by springs 9 and 10, respectively. In the direction of
When the main valve bodies 7 and 8 open the main valve ports 5 and 6, the fluid flowing from one of the main flow paths 3 and 4 flows out from the other through the main valve chamber 2. .

A pilot inflow passage 13 is formed in the valve body 1 on the back pressure side of both ends of the main valve chamber 2 through communication passages 11 and 12, and at both ends of the pilot inflow passage 13 Shuttle valve ports 14 and 15 are formed and this pilot inflow path
A shuttle valve body 16 for opening and closing the shuttle valve ports 14 and 15 is slidably provided in the valve 13, and bleed ports 17 and 18 formed in the main valve bodies 7 and 8 and the main valve chamber 2 are provided in the pilot inflow passage 13. Fluid flowing from the gap between the valve body and the main valve bodies 7 and 8 presses and slides the shuttle valve body 16 to close one of the shuttle valve ports 14 and 15.

A pilot outlet passage 19 communicating with an intermediate portion of the main valve chambers 7 and 8 of the main valve chamber 2 communicates with an intermediate portion of the pilot inflow passage 13.
A control valve chamber 20 is formed at an intermediate portion of the control valve chamber 20, and a control valve port 24 of the control valve chamber 20 which is operated by a plunger 23 which is sucked by an excitation operation of an electromagnetic device 22 is provided. .

[0005] For example, when the fluid pressure in one main flow path 3 becomes high, the fluid flows into the bleed port 17 of the main valve body 7 closing the one main valve port 5 of the main valve chamber 2 and the main valve chamber. The gas flows into the back pressure side of the main valve body 7 from a gap between the main valve body 2 and one of the main valve bodies 7. The fluid that has flowed into the back pressure side of one main valve body 7 flows into the pilot inflow path 13 from the communication passage 11 and presses the shuttle valve body 16 toward the other shuttle valve port 15. The fluid flowing into the pilot inflow passage 13 flows into the pilot outflow passage 19, and the control valve body 24 closes the control valve port 21. The other shuttle valve port 15 is kept closed.

Further, in this state, the fluid pressure on the back pressure side of the one main valve body 7 increases, and the one main valve body 7 closes the one main valve port 5 by the urging force of the spring 9 and the fluid pressure. Will be retained.

Further, when the electromagnetic device 22 is excited in this state, the plunger 23 is sucked against the spring 25, the control valve body 24 opens the control valve port 21, and the fluid flows through the pilot outflow passage 19. It flows out and flows into the space between the main valve bodies 7 and 8 of the main valve chamber 2, the fluid pressure between the main valve bodies 7 and 8 of the main valve chamber 2 increases, and the other main valve body 8 resists the spring 10. And slides to open the other main valve port 6, and the fluid flows out to the other main flow path 4.
At the same time, the fluid pressure on the back pressure side of the one main valve element 7 also decreases, and the one main valve element 7 slides against the spring 9 in balance with the fluid pressure applied to the one main flow path 3 so as to slide. The main valve ports 5 and 6 are opened, and the main valve bodies 7 and 8 maintain the state where the main valve ports 5 and 6 are opened by the fluid pressure applied to one main flow path 3, and the fluid flows from one main flow path 3 to the other. Out of the main flow path 4.

When the electromagnetic device 22 is de-energized in this state, the plunger 23 is returned by the spring 25 to close the control valve port 21 and the fluid pressure in the pilot inflow passage 13 increases, so that the shuttle valve body 16 The other shuttle valve port 15 is closed, and the back pressure of the one main valve body 7 increases, and the one main flow path 3 is closed.
When the pressure becomes equal to the fluid pressure of the first valve body, the one main valve element 7 closes the one main valve port 5 by the urging force of the spring 9, and the other main valve element 8 closes the main valve port 5 by the urging force of the spring 10. 6 is closed.

When the fluid pressure in the other main flow path 4 increases, the fluid pressure on the back pressure side of the other main valve body 8 increases,
The shuttle valve body 16 closes the one shuttle valve port 14 with the fluid flowing into the pilot inflow path 13 from the other shuttle valve port 15, and the fluid pressure in the pilot outflow path 19 is also increased. In this state, the fluid pressure on the back pressure side of the other main valve body 8 increases, and the other main valve body 8 is held in a state where the other main valve port 6 is closed by the urging force of the spring 10 and the fluid pressure.

In this state, when the electromagnetic device 22 is excited and the control valve 24 opens the control valve port 21, the fluid flows out of the pilot outflow passage 19, and the fluid flows out of the main valve 7, 8 of the main valve chamber 2. The main valve element 7 is slid against the spring 9 to open one main valve port 5, and the fluid flows out to one main flow path 3 and at the same time, the other main valve element 8 The fluid pressure on the back pressure side also decreases, and the other main valve body 8 slides against the spring 10 to open the other main valve port 6 in balance with the fluid pressure applied to the other main flow path 4, The fluid pressure applied to the other main flow path 4 keeps the main valve bodies 7, 8 with the main valve ports 5, 6 opened, and the fluid flows out of the other main flow path 4 to one main flow path 3.

When the electromagnetic device 22 is de-energized in this state, the plunger 23 is returned by the spring 25 to close the control valve port 21, and the fluid pressure in the pilot inflow passage 13 increases, and the shuttle valve body 16 When one shuttle valve port 14 is closed and the pressure on the back pressure side of the other main valve body 8 increases and becomes equal to the fluid pressure applied to the other main flow path 4, the other main valve body 8 is biased by the spring 10. Closes the other main valve port 6, and one main valve element 7 closes the one main valve port 5 by the spring 9.

[0012]

In the above-mentioned reversible solenoid valve, main valve ports 5 and 6 are formed in communication portions between the main valve chamber 2 and the pair of main flow paths 3 and 4, respectively. The two main passages 3 and 4 communicating with the main valve chamber 2 and the communication between the two main passages 3 and 4 and the main valve chamber 2 are provided because of the structure in which the pair of main valve bodies 7 and 8 respectively opening and closing the main valve body 6 are provided. The structure of the fluid passage forming the pair of main valve ports 5 and 6 formed in the portion becomes complicated, and there is a problem that a pressure loss occurs and the flow rate cannot be increased.

The present invention has been made in view of the above problems, and has a pair of main flow paths and a main valve port of a main valve chamber communicating with the two main passages. It is an object of the present invention to provide a reversible solenoid valve capable of simplifying a channel structure by allowing passages to communicate with each other, reducing pressure loss, and increasing a flow rate.

[0014]

According to the present invention, there is provided a reversible solenoid valve of the present invention comprising: a pair of main passages each having an inlet and an outlet opened at both end surfaces; a main valve chamber having a main valve port communicating with the pair of main passages; A pilot inflow passage having both ends communicating with the main flow passage and having a shuttle valve port formed at both ends thereof, a control flow passage having a control valve opening communicated with the pilot inflow passage through the back pressure side of the main valve chamber, A valve body provided with a pair of pilot outflow paths respectively connected to the pair of main flow paths from the control flow path through the check valve ports, and a main body provided in the main valve chamber of the valve body so as to be able to advance and retreat, and the main body is provided with a spring. A main valve body which is urged in a direction to close the valve port and partitions the main valve chamber between the main valve port side and the back pressure side, and a pair of main flow paths provided slidably in the pilot inflow passage. Both shuttles by fluid pressure And the shuttle valve body for opening and closing the mouth,
A control valve body that is operated by an electromagnetic device to open and close the control valve port, and a check valve body that opens and closes the two check valve ports to prevent fluid from flowing from the main flow path to the control flow path. Things.

[0015] When the fluid pressure at one of the inflow ports and the outflow port increases when the main valve body closes the main valve port by the biasing force of the spring and the control valve port is closed by the control valve element, one of the inflow ports increases. The fluid flowing into the main flow path flows into the pilot inflow path from one end side, and the fluid presses the shuttle valve body to the other end side to close the other shuttle valve port, and the other main flow path from the other end side of the pilot inflow path. Prevents spillage on roads.

The fluid that has flowed into one of the main flow paths presses one of the check valves in a direction opposite to the flow direction to close the one of the check valve ports. Because the valve is closed, it does not flow into the control flow path,
The fluid pressure on the back pressure side of the main valve chamber increases. In this state, the pressure on the back pressure side of the main valve chamber increases, and the main valve body is held in a state where the main valve port is closed by the urging force of the spring.

In this state, when the control valve body opens the control valve port when the electromagnetic device is energized, the fluid flowing into the control flow path is closed by one of the check valve bodies due to the fluid pressure from the one main flow path. Therefore, the fluid flowing from one main flow path flows through the pilot inflow path, the back pressure side of the main valve chamber, the control valve port, the control flow path, the other check valve port, and flows out to the other pilot flow path. It flows out from the other pilot outflow channel to the other main flow channel.

When the fluid on the back pressure side of the main valve element flows out of the control flow path, the main valve element is pressed from the main valve port against the urging force of the spring by the fluid pressure flowing into one of the main flow paths. Fluid flows out of one main flow path to the other main flow path to lift up and open the main valve port.

In a state where the fluid is flowing from one main flow path to the other main flow path, when the power supply to the electromagnetic device is cut off and the control valve body closes the control valve port, the back pressure side of the main valve chamber is closed. The main valve body closes the main valve port by this fluid pressure and the urging force of the spring, and the outflow of the fluid to the other main flow path is stopped.

When the fluid pressure in the other main flow path is increased, the fluid is discharged from the other main flow path to the one main flow path at the opening of the control valve port by the same operation.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a reversible solenoid valve according to an embodiment of the present invention.

As shown in FIGS. 2 to 5, the valve body 30 is composed of a main body 31 and a lid 33 connected to the main body 31 by bolts 32.

As shown in FIGS. 1 to 4, the main body 31 of the valve body 30 has a pair of main passages 36, 37 having inlets and outlets 34, 35 opened at substantially center portions of both end surfaces, respectively. The upper part of the inner end of one main flow path 36 is formed as shown in FIG.
As shown in FIGS. 3 and 5, a main valve chamber 38 that is open on the upper surface of the main body 31 is formed, and a main valve port 40 is formed in a communicating portion between the main valve chamber 38 and one of the main flow paths 36. ing. As shown in FIG. 3, the inner end of the other main flow passage 37 communicates with the main valve chamber 38. The two main flow passages 37 and 38 pass through the main valve chamber 38 when the main valve port 40 is opened. Communicated.

Also, as shown in FIGS. 1 and 2, the inflow communication passages 41, 42 opened on one side of the inner peripheral surface of the main flow passages 37, 38.
Are formed in a direction orthogonal to the main flow passages 36 and 37, and the leading ends of the inflow communication passages 41 and 42 are provided at both ends of a linear pilot inflow passage 43 formed in parallel with the main flow passages 36 and 37, respectively. Are in communication. Shuttle valve ports 44 and 45 are formed at both ends of the pilot inflow passage 43. The pilot inflow passage 43 is formed by a perforation 46 opened at the end face of the main body 31, one shuttle valve port 44 is formed by a reduced diameter portion, and the other shuttle valve port 45 is formed by a valve seat member 47. The opening end of the perforation 46 is closed by a stopper 48.

Further, as shown in FIGS. 1 and 5, an intermediate portion of the pilot inflow passage 43 is a main valve port of the main body portion 31.
A vertical control communication passage 50 opened to a concave recess 49 formed at the upper peripheral edge of 40 is communicated through a throttle hole 51 with the pilot inflow passage 43 through the control communication passage 50.
It is connected to 38 back pressure side.

As shown in FIGS. 1, 4 and 5, a vertical control flow path 52 is provided in the concave portion 49 of the main body 31.
A valve seat protruding edge 54 forming a control valve port 53 is formed at an opening edge of the control flow channel 52 to the concave recess 49. An intermediate portion of a horizontal control outflow passage 55 formed at a symmetrical position across the main valve chamber 38 in parallel with the pilot inflow passage 43 is communicated with the inner end of the control flow passage 52. The control outflow passage 55 is formed by a perforation 55a opened on one side surface of the main body 31, and this perforation 55a is closed by a stopper 48b.

Further, check valve chambers 58 and 59 having check valve ports 56 and 57 are formed at both ends of the control outflow passage 55. The check valve chambers 58 and 59 are formed by the pair of main flow paths. The pilot outflow passages 60 and 61, which are orthogonal to the 36 and 37, respectively, are connected to the pair of main flow passages 36 and 37, respectively.
Are opened on the other side of the inner peripheral surface of the.

The inflow communication passages 41 and 42 and the pilot outflow passages 60 and 61 are formed by a main body with the main flow passages 36 and 37 interposed therebetween.
31 are formed in a straight line with perforations 62, 63 opened on one side surface, and the open ends of the perforations 62, 63 are closed by plugs 64, 65.
The check valve chambers 58, 59 are opened on the lower surface of the main body 31, and the openings of the check valve chambers 58, 59 are closed by plugs 66, 67.

As shown in FIGS. 3 and 5, a spring receiving projection 70 projecting from the main valve chamber 38 projects from the lower surface of the lid 33. In the state fitted to the upper surface, the upper surface of the main valve chamber 38 of the main body portion 31 is closed, and a space serving as a back pressure portion of the main valve chamber 38 is formed above the concave portion 49, and the space portion includes Control communication path 50 and control flow path
The control valve port 53 of 52 is communicated with the back pressure side of the main valve chamber 38.

Next, as shown in FIGS. 1, 3 and 5, a main valve body 71 provided on the inner peripheral surface of the main valve chamber 38 so as to be able to move forward and backward is provided in the main valve chamber 38 of the valve body 30. The main valve port 40 and the back pressure side are air-tightly or liquid-tightly separated from each other by sliding on the inner peripheral surface. On the upper surface of the main valve body 71, a main valve body guide body 73 slidably fitted in the main valve chamber 38.
A spring receiving hole 74 is formed on the upper surface of the main valve body guide 73. One end of the spring receiving hole 74 is fitted into the spring receiving hole 74 of the main valve body guide 73, and the spring receiving hole of the lid 33 is The main valve body 71 is urged in a direction of closing the main valve port 40 via a main valve body guide 73 by a coil spring 75 having the other end wound around the projection 70.

As shown in FIGS. 1 and 2, a shuttle valve body 80 slidably provided in the pilot inflow passage 43 slides by the fluid pressure of the pair of main flow passages 36 and 37 to slide. One of the shuttle valve ports 45 and 46 is closed and the other is opened.

Next, as shown in FIG.
Check valves 81 and 82 for opening and closing 56 and 57 respectively are provided in the check valve chambers 58 and 59 so as to be able to advance and retreat, and the check valves 81 and 82 are respectively connected to the main flow passages 36 and 37 from the control outflow passages. The check valve ports 56 and 57 are opened by the fluid pressure on the control outflow passage 55 side while preventing the fluid from flowing into the control outflow passage 55.

As shown in FIGS. 4 and 5, the electromagnetic device 85 for opening and closing the control valve port 53 includes a coil 86, an iron core 87 fitted and fixed to the coil 86, and a yoke 88. Guide tube fitted and fixed to this coil 86
A plunger 90 that is attracted by the excitation of the iron core 87 is fitted to 89 so as to be able to advance and retreat, and the plunger 90 is controlled by a control valve body 92 fitted to the tip of the plunger 90 by a coil spring 91. It is urged in a direction to close the valve port 53. Also, the control valve body is provided between the tip of the plunger 90 and the control valve body 92 fitted to the plunger 90.
A coil-shaped spring 93 that biases the control valve port 53 in a direction in which 92 closes the control valve port 53 is mounted.

As shown in FIGS. 4 and 5, the electromagnetic device 85 is attached to the valve body 30 by fitting the guide tube 89 into a fitting hole 96 formed in the lid 33.

Next, the operation of this embodiment will be described with reference to FIG.

When the main valve body 71 closes the main valve port 40 of the main valve chamber 38 by the urging force of the spring 75 and the control valve port 53 is closed by the control valve element 92, one of the inflow / outflow ports 34 is provided. When the fluid pressure increases, the fluid that has flowed into one of the main flow paths 36 flows into the pilot inflow path 43 from one of the inflow communication paths 41 at one end, and the fluid that has flowed into the pilot inflow path 43 is a shuttle valve body 80. To the other end, and the other shuttle valve port 45
To prevent flow from the other end of the pilot inflow channel 43 to the other main flow channel 37.

The fluid that has flowed into one main flow path 36 flows into one check valve chamber 58 through one pilot flow path 60, and pressurizes a check valve body 81 in a direction opposite to the flow direction to cause one flow. Further, the fluid that has flowed into the pilot inflow passage 43 flows into the back pressure side of the main valve chamber 38 through the control communication passage 50, but the control valve body 92 is closed. There is no outflow from the path 52 to the pilot outflow paths 60, 61 via the control outflow path 55. In this state, the pressure on the back pressure side of the main valve chamber 38 increases, and the main valve body 71 is kept closed by the urging force of the spring 75.

In this state, the plunger 90 is attracted to the iron core 87 excited by energizing the coil 86 of the electromagnetic device 85, the control valve body 92 opens the control valve port 53, and the fluid flowing into the control flow path 52 Flows into the control outflow passage 55, and the one check valve port 56 is closed by the check valve body 81 which is pressed by the fluid pressure from the one main flow passage 36, so that it flows into the one main flow passage 36. The inflow communication passage 41, the pilot inflow passage 43, the control communication passage 50, the back pressure side of the main valve chamber 38, the control valve port 53, the control flow passage 52,
It flows through the control outlet channel 55 and, in addition, the other check valve body 82
Flows out to the other pilot outflow path 61 through the check valve port 57 which is opened by pressing with fluid pressure, and flows out from the pilot outflow path 61 to the other main flow path 37.

When the fluid on the back pressure side of the main valve chamber 38 flows out of the control flow path 52, the main valve body 71 resists the urging force of the spring 75 by the fluid pressure flowing into one main flow path 36. Main valve
Fluid flows out of one main flow path 36 to the other main flow path 37 because it rises from 40 and opens the main valve port 40.

In a state where the fluid is flowing from one main flow path 36 to the other main flow path 37, the power supply to the electromagnetic device 85 is cut off, and the plunger 90 is urged by the spring 91.
When the control valve body 92 closes the control valve port 53, the fluid pressure on the back pressure side of the main valve chamber 38 increases, and the main valve body 71 closes the main valve port 40 by the fluid pressure and the urging force of the spring 75, thereby closing the other valve port. The fluid does not flow out to the main flow path 37.

The fluid that has flowed into one of the main flow paths 36 flows from one of the inflow communication paths 41 into the pilot inflow path 43 from one end side, and the fluid that has flowed into the pilot inflow path 43 passes through the shuttle valve body 80 to the other end. Push to the end side and the other shuttle valve port
45 is closed to prevent the pilot inflow channel 43 from flowing out of the other end into the other main flow channel 37.

The fluid that has flowed into one main flow path 36 flows into one check valve chamber 58 through one pilot flow path 60, and presses a check valve body 81 in a direction opposite to the flow direction, thereby causing the one-way flow. Further, the fluid that has flowed into the pilot inflow passage 43 flows into the back pressure side of the main valve chamber 38 through the control communication passage 50, but the control valve body 92 is closed. There is no outflow from the path 52 to the pilot outflow paths 60, 61 via the control outflow path 55. In this state, the pressure on the back pressure side of the main valve chamber 38 increases, and the main valve body 71 is kept closed by the urging force of the spring 75.

Next, when the fluid pressure at the other inflow / outflow port 35 increases, the fluid flowing into the other main flow path 37 is supplied to the other inflow communication path.
The fluid flowing into the pilot inflow passage 43 from the other end side through 42 presses the shuttle valve body 80 to one end side to close one shuttle valve port 44, and the pilot inflow passage 43 From the one end side to the one main flow path 36.

The fluid that has flowed into the other main flow path 37 flows into the other check valve chamber 59 via the other pilot outflow path 61, and pressurizes the check valve body 82 in a direction opposite to the flow direction, thereby causing the other check valve body 82 to flow. Further, the check valve port 57 is closed, and the fluid flowing into the pilot inflow passage 43 flows into the back pressure side of the main valve chamber 38 through the control communication passage 50, but the control valve body 92 is closed. There is no outflow from the path 52 to the pilot outflow paths 60, 61 via the control outflow path 55. In this state, the pressure on the back pressure side of the main valve chamber 38 increases, and the main valve body 71 is kept closed by the urging force of the spring 75.

In this state, the plunger 90 is attracted to the iron core 87 excited by energizing the coil 86 of the electromagnetic device 85, the control valve body 92 opens the control valve port 53, and the fluid flowing into the control flow path 52 Flows into the control outflow passage 55, and the other check valve port 57 is closed by the check valve body 82 pressed by the fluid pressure from the other main flow passage 37, so that the other check valve opening 57 flows into the other main flow passage 37. The flowed fluid is the other inflow communication path 42, the pilot inflow path 43, the control communication path 50, the back pressure side of the main valve chamber 38, the control valve port 53, the control flow path 52,
It flows through the control outlet channel 55, and further, the one check valve body 81
Flows out to one pilot outflow channel 60 through a check valve port 56 which is opened by pressing with fluid pressure, and flows out from this pilot outflow channel 60 to one main flow channel 36.

When the fluid on the back pressure side of the main valve chamber 38 flows out of the control flow path 52, the main valve body 71 resists the urging force of the spring 75 by the fluid pressure flowing into the other main flow path 37. Main valve
Fluid flows out of the other main flow path 37 to the other main flow path 36 because it floats up from the 40 and opens the main valve port 40.

Further, in a state where the fluid is flowing from the other main flow path 37 to the one main flow path 36, the power supply to the electromagnetic device 85 is cut off, and the plunger 90 is urged by the spring 91.
When the control valve element 92 closes the control valve port 53, the fluid pressure on the back pressure side of the main valve chamber 38 increases, and the main valve element 71 closes the main valve port 40 by this fluid pressure and the urging force of the spring 75 to close one of the main valve ports 40. The outflow of the fluid to the main flow path 36 is eliminated.

The fluid that has flowed into the other main flow path 37 flows into the pilot inflow path 43 from the other inflow communication path 42 from the other end side, and the fluid that has flowed into the pilot inflow path 43 passes through the shuttle valve body 80. Push to one end side and one shuttle valve port
44 is closed to prevent the pilot inflow channel 43 from flowing out to one main flow channel 36 from one end thereof.

The fluid that has flowed into the other main flow path 37 flows into the other check valve chamber 59 through the other pilot outflow path 61, and pressurizes the check valve body 82 in a direction opposite to the flow direction, thereby causing the other check valve body 82 to flow. Further, the check valve port 57 is closed, and the fluid flowing into the pilot inflow passage 43 flows into the back pressure side of the main valve chamber 38 through the control communication passage 50, but the control valve body 92 is closed. There is no outflow from the path 52 to the pilot outflow paths 60, 61 via the control outflow path 55. In this state, the pressure on the back pressure side of the main valve chamber 38 increases, and the main valve body 71 is kept closed by the urging force of the spring 75.

[0050]

According to the present invention, there is provided a reversible solenoid valve which can be pilot-controlled by a control valve body opened and closed by an electromagnetic device and can be caused to flow out of one of a pair of main flow paths to the other by a fluid pressure. A pair of main flow passages and a main valve port of a main valve chamber communicating with the two main passages are made into a single main valve opening, and the opening and closing of one main valve body allows the two main flow passages to communicate with each other. The loss can be reduced and the flow rate can be increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a reversible solenoid valve according to an embodiment of the present invention with a cover of a valve body removed.

FIG. 2 is a vertical sectional front view taken along the line II-II of FIG.

FIG. 3 is a vertical sectional front view taken along line III-III shown in FIG. 1;

FIG. 4 is a vertical sectional front view taken along the line IV-IV shown in FIG. 1;

FIG. 5 is a vertical sectional front view taken along a line VV shown in FIG. 1;

FIG. 6 is an explanatory view showing the same flow path.

FIG. 7 is a vertical sectional front view of a conventional reversible solenoid valve.

[Explanation of symbols]

 30 Valve body 34, 35 Inlet / outlet 36, 37 Main flow path 38 Main valve chamber 40 Main valve port 43 Pilot inflow path 44, 45 Shuttle valve port 52 Control flow path 53 Control valve port 56, 57 Check valve port 60, 61 Pilot Outflow path 71 Main valve element 75 Spring 80 Shuttle valve element 81, 82 Check valve element 85 Electromagnetic device 92 Control valve element

Claims (1)

[Claims] 1. A pair of main flow passages each having an inlet and an outlet opened at both end surfaces, a main valve chamber having a main valve port communicating with the pair of main flow passages, and both end portions connected to the main flow passage. A pilot inflow channel with a shuttle valve port
A control flow path having a control valve port communicated with the pilot inflow path through the back pressure side of the main valve chamber, a pair of pilots respectively communicating from the control flow path to the pair of main flow paths through the check valve ports, respectively; A valve body provided with an outflow passage, slidably provided in a main valve chamber of the valve body, urged by a spring in a direction to close the main valve port, and connecting the main valve chamber to the main valve port side. A main valve body for partitioning the back pressure side, a shuttle valve body slidably provided in the pilot inflow passage, for opening and closing the two shuttle valve ports by fluid pressure of the pair of main flow paths, A reversible valve, comprising: a control valve element that opens and closes a valve port; and a check valve element that opens and closes each of the two check valve ports to prevent fluid from flowing from the main flow path to the control flow path. solenoid valve.