CN221569600U - Pilot-operated electromagnetic valve - Google Patents

Abstract

Provided is a pilot-operated solenoid valve which can be opened and closed even when the inlet side and the outlet side are at a high differential pressure. The pilot solenoid valve includes: a main valve element disposed in the housing chamber of the valve body and having a pilot passage and a pilot valve seat; a suction element disposed apart from the main valve element and connected to the main valve element via a connecting member; a first spring for biasing the suction element toward the main valve element; a plunger movably disposed between the suction element and the main valve element; a second spring for biasing the plunger toward the main valve element; a housing body for housing the plunger and the suction element; and a solenoid which is externally inserted in the housing, attracts the plunger by the attraction element when energized, and moves the plunger and the attraction element against the urging forces of the first spring and the second spring.

Description

Pilot-operated electromagnetic valve

Technical Field

The present utility model relates to a pilot-operated solenoid valve.

Background

For example, a solenoid valve described in patent document 1 is known.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2007-92859

Technical problem to be solved by the utility model

In the solenoid valve for treating a high-pressure fluid, it is desirable that the opening and closing operation be reliably performed even under a condition where a pressure difference between an inflow port side to which a high pressure acts and an outflow port side to which a low pressure acts is larger, that is, a high differential pressure.

Disclosure of utility model

In view of the above-described circumstances, an object of the present utility model is to provide a pilot-operated solenoid valve that can be opened and closed even when the inflow port side and the outflow port side are at a high differential pressure.

Technical means for solving the technical problems

The pilot-operated solenoid valve according to the first aspect includes: a valve body having an inlet and an outlet for fluid and a housing chamber having a main valve seat between the inlet and the outlet; a main valve body that divides an interior of the housing chamber into a main valve chamber and a pilot valve chamber that communicate with the inflow port, a pilot passage that can communicate the main valve chamber and the pilot valve chamber is formed, a pilot valve seat is formed on the pilot valve chamber side of the pilot passage, and the main valve body is disposed so as to be movable in the interior of the housing chamber and is abutted against the main valve seat, and constitutes a main valve portion together with the main valve seat; a suction element made of a magnetic material, the suction element being disposed so as to be separated from the main valve element toward the pilot valve chamber; an interlocking member that interlocks the suction element and the main valve element; a first spring that biases the suction element toward the main valve element; a plunger made of a magnetic material, the plunger being provided between the suction element and the main valve element so as to be movable, an end portion of the plunger on the main valve element side being capable of abutting against the pilot valve seat, and forming a pilot valve portion together with the pilot valve seat; a second spring disposed between the suction element and the plunger, and configured to bias the plunger toward the main valve element; a housing body fixed to the valve main body, the housing body housing the plunger and the suction element so as to be movable; and a solenoid that is externally inserted into the housing and that adsorbs the suction element and the plunger when energized.

When the solenoid of the pilot-operated solenoid valve according to the first aspect is not energized, the plunger receiving the biasing force of the second spring contacts the pilot valve seat to prevent the passage of the fluid in the pilot passage, and the pilot valve unit is in the valve-closed state. The suction element is biased by the biasing force of the first spring, the main valve element that is linked to the suction element is in contact with the main valve seat, the passage of fluid between the inlet and the outlet is prevented, and the main valve portion is in a closed state. Thereby, the pilot type solenoid valve is in a closed state.

On the other hand, when the solenoid is energized, the plunger is attracted to the attraction element and the plunger is separated from the pilot valve seat, and the pilot valve chamber and the outflow port communicate with each other through the pilot passage, so that the pilot valve section is in the valve-opened state.

When the pilot valve chamber and the outflow port communicate with each other through the pilot passage, the pressure in the pilot valve chamber is released to the outflow port via the pilot passage, and a pressure difference is generated in a state where the pressure on the main valve chamber side of the main valve body is relatively higher than the pressure on the pilot valve chamber side, and a force in a direction away from the main valve seat acts on the main valve body.

When a force in a direction away from the main valve seat acts on the main valve body, the main valve body moves in a direction away from the main valve seat, and the suction element interlocked with the main valve body through the interlocking member also moves in a direction away from the main valve seat together with the main valve body.

In this way, when the solenoid is energized, a force in a direction away from the main valve seat acts on the main valve body and the main valve body is separated from the main valve seat, so that the main valve portion is in the valve-opened state.

A pilot-operated solenoid valve according to a second aspect is the pilot-operated solenoid valve according to the first aspect, wherein the main valve spool is provided in the housing chamber so as to be movable by a dimension L2 in a direction away from the main valve seat along a moving direction of the plunger from a state of contact with the main valve seat, and a gap of a dimension L1 smaller than the dimension L2 is formed by receiving a biasing force of the first spring between the suction element and the plunger in a non-energized state of the solenoid.

In the pilot-operated solenoid valve according to the second aspect, in the non-energized state of the solenoid, the force of the first spring is received, and a gap of a dimension L1 is formed between the suction element and the plunger. The dimension L1 is smaller than the dimension L2 in which the main valve spool is movable in the direction away from the main valve seat, and the plunger is closer to the suction element than in the case where the dimension L1 is equal to or larger than the dimension L2 (the dimension L1 is equal to or larger than the dimension L2) as in the conventional case (see fig. 4), so that a larger suction force acts on the plunger. Therefore, the plunger is easily attracted to the attraction element, and the plunger can be separated from the pilot valve seat, so that the pilot valve portion can be reliably opened.

A pilot-operated solenoid valve according to a third aspect is the pilot-operated solenoid valve according to the first or second aspect, comprising: a magnet coupled to the attraction element; and a magnetic sensor provided in the housing and detecting a magnetic flux density of the magnet.

In the pilot-operated solenoid valve according to the third aspect, since the magnet is connected to the suction element connected to the main spool via the interlocking member, when the main spool moves, the distance between the magnet and the magnetic sensor changes, and the magnetic flux density of the magnet detected by the magnetic sensor changes.

For example, when the magnet is brought close to the magnetic sensor by moving the main valve element in a direction away from the main valve seat, if the magnetic flux density detected by the magnetic sensor is large, a state in which the main valve element moves in a direction away from the main valve seat, that is, a state in which the main valve portion opens can be detected. On the other hand, when the magnetic flux density detected by the magnetic sensor is small, the state in which the main valve element is in contact with the main valve seat and the main valve portion is closed can be detected.

In the pilot-operated solenoid valve according to the third aspect, the failure of the opening/closing operation of the main valve portion can be detected based on the relationship between the energization of the solenoid and the magnetic flux density detected by the magnetic sensor, and the position of the main valve portion can be detected independently of the energization of the solenoid.

A pilot-operated solenoid valve according to a fourth aspect is the pilot-operated solenoid valve according to the first aspect, comprising: when the solenoid is energized, the plunger and the attraction element are moved in a direction away from the main valve seat against the urging force of the first spring.

In the pilot-operated solenoid valve according to the fourth aspect, when the solenoid is energized, the plunger and the suction element are magnetized, and the plunger and the suction element can be moved in a direction away from the main valve seat against the urging force of the first spring, whereby the main valve element that is interlocked with the suction element can be moved away from the main valve seat.

A pilot-operated solenoid valve according to a fifth aspect is the pilot-operated solenoid valve according to the first aspect, further comprising a third spring that biases the main valve element toward the suction element, wherein the interlocking member is sandwiched between the main valve element and the suction element.

In the pilot-operated solenoid valve according to the fifth aspect, the main spool is biased toward the suction element by the third spring, and the suction element is biased toward the main spool by the first spring, so that the interlocking member is sandwiched between the main spool and the suction element by the biasing force of the first spring and the biasing force of the third spring, and the suction element, the interlocking member, and the main spool are integrally movable.

A pilot-operated solenoid valve according to a sixth aspect is the pilot-operated solenoid valve according to the first aspect, wherein the suction element and the main spool are coupled by a plurality of the interlocking members.

In the pilot-operated solenoid valve according to the sixth aspect, the suction element and the main spool are connected by a plurality of interlocking members, so that the suction element and the main spool can be integrally operated. In addition, a pilot valve portion can be formed between one interlocking member and the other interlocking member.

A pilot-operated solenoid valve according to a seventh aspect is the pilot-operated solenoid valve according to the first aspect, wherein the suction element and the main spool are coupled by one of the interlocking members.

In the pilot-operated solenoid valve according to the seventh aspect, the suction element and the main spool are connected by a single interlocking member, so that the suction element and the main spool can be integrally operated. In addition, by connecting the suction element and the main valve element by one interlocking member, the number of parts can be reduced as compared with the case where the suction element and the main valve element are connected by a plurality of interlocking members.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the pilot-operated solenoid valve of the present utility model described above, the valve can be opened and closed even when the differential pressure between the inlet side and the outlet side is high.

Drawings

Fig. 1 is a cross-sectional view showing a pilot-operated solenoid valve according to a first embodiment.

Fig. 2 is an exploded perspective view showing a main portion of the pilot-operated solenoid valve according to the first embodiment.

Fig. 3 (a) to (D) are explanatory diagrams showing operations of the pilot-operated solenoid valve according to the first embodiment.

Fig. 4 is a cross-sectional view showing a main part of a pilot-operated solenoid valve of a conventional structure.

Fig. 5 is a cross-sectional view showing a pilot-operated solenoid valve according to a second embodiment.

Fig. 6 (a) to (D) are explanatory diagrams showing operations of the pilot-operated solenoid valve according to the second embodiment.

Fig. 7 is a cross-sectional view showing a pilot-operated solenoid valve according to a third embodiment.

Fig. 8 is a cross-sectional view showing a pilot-operated solenoid valve according to a fourth embodiment.

Fig. 9 is a cross-sectional view showing a pilot-operated solenoid valve according to a fifth embodiment.

Symbol description

10 Pilot type electromagnetic valve

12 Valve body

18 Flow inlet

20 Outflow openings

22 Main valve chamber

24 Main valve core

24A pilot valve seat

24B pilot passage

26 Suction element

28 Plunger

30 Pipe (containing body)

40 Solenoid

44 First spring

46 Bulge (Magnetitum)

52 Second spring

55 Pilot valve chamber

58 Main valve seat

60 Linkage parts

70 Magnetic sensor

80 Coil springs (third springs).

Detailed Description

First embodiment

A pilot-operated solenoid valve 10 according to a first embodiment of the present utility model will be described with reference to fig. 1 to 3.

Fig. 1 shows a cross-sectional view of the pilot solenoid valve 10 of the present embodiment in a closed state (the main valve portion 14 and the pilot valve portion 16 described below are both in a closed state). The pilot-operated solenoid valve 10 of the present embodiment is a pilot-operated solenoid valve that includes a main valve portion 14 and a pilot valve portion 16 in a valve main body 12, and that can be used in, for example, a refrigeration cycle of an air conditioner for an automobile, and that can open and close the flow of fluid between an inlet 18 and an outlet 20 of the fluid by opening and closing the main valve portion 14.

The inflow port 18 and the outflow port 20 are formed in the valve body 12 as a valve body. The valve body 12 is provided with a housing chamber 21 between the inlet port 18 and the outlet port 20.

The main valve body 24, which will be described later, is housed in the housing chamber 21 so as to be able to slide up and down, and the main valve body 24 partitions the interior of the housing chamber 21 into a main valve chamber 22 and a pilot valve chamber 55. The main valve portion 14 is formed on one side (lower side in the drawing) in the sliding direction of the main valve 24, and the pilot valve portion 16 is disposed on the other side (upper side in the drawing). The main valve chamber 22 communicates with the inflow port 18 at the side.

As shown in fig. 1 and 2, in the upper center of the pilot solenoid valve 10, a suction element 26 and a plunger 28 made of a magnetic material are slidably disposed in a tube 30 that is a housing that is open at the bottom and closed at the top. The suction member 26 is disposed above the plunger 28.

An annular nut 32 is integrally fixed to the lower end side of the tube 30. An external thread is formed on the outer periphery of the nut 32, and the nut 32 is screwed with an internal thread of a large diameter recess 34 formed in the center of the upper surface of the valve body 12, and is fixed to the valve body 12.

A concave main valve chamber 22 having a smaller diameter than the large-diameter concave portion 34 is formed in the center of the bottom of the large-diameter concave portion 34 in the valve main body 12.

An annular recess 36 is formed on the outer peripheral side of the main valve chamber 22 of the valve body 12 at the bottom of the large diameter recess 34. The O-ring 38 is fitted into the annular recess 36, and the lower surface of the nut 32 is bonded to the O-ring 38, thereby sealing the gap between the nut 32 and the valve body 12.

A cylindrical solenoid 40 is disposed on the outer peripheral side of the tube 30. The solenoid 40 is configured by surrounding the periphery of a bobbin 40B around which a coil 40A is wound with a yoke 40C (also referred to as a case) formed of a magnetic material.

The suction member 26 is formed in a cylindrical shape. A through hole 26A penetrating in the axial direction is formed in the axial center of the suction element 26. A recess 26B for removing the wall thickness, which communicates with the through hole 26A and has a larger diameter than the through hole 26A, is formed in the upper portion of the suction element 26.

With the above configuration, when the solenoid 40 is energized, both the attraction element 26 and the plunger 28 are magnetized, and the attraction element 26 and the plunger 28 are attracted. At this time, since the main valve pad 56 of the main valve body 24 connected by the interlocking member 60 is in contact with the main valve seat 58, even if the suction element 26 is magnetized by the energization of the solenoid 40, the suction element 26 does not move downward. That is, only the plunger 28 moves upward and is attracted to the suction element 26. At this time, the plunger 28 moves upward, and opens the pilot passage 24B formed in the main spool 24.

When the plunger 28 is attracted to the attraction element 26 as an integrated magnetic body (connection pair), an upward force (attraction force F1, first force; see fig. 3B) acts on the connection pair of the plunger 28 and the attraction element 26. In other words, the pilot solenoid valve 10 is configured to: when the solenoid 40 is energized, the plunger 28 and the suction element 26 are moved in a direction away from the main valve seat 58 against the biasing force of a first spring 44 described later.

When the plunger 28 is adsorbed to the suction element 26 and the pilot valve chamber 55 and the outflow port 20 communicate with each other through the pilot passage 24B, as will be described later, the pressure of the pilot valve chamber 55 is released to the outflow port 20 through the pilot passage 24B, and the pressure on the main valve chamber 22 side of the main valve body 24 is relatively higher than the pressure on the pilot valve chamber 55 side, whereby a force (F2, a second force) in a direction away from (above) the main valve seat 58 acts on the main valve body 24 (see fig. 3 (B)).

As a result, the main valve spool 24 moves upward to open the valve to the main valve seat 58 (main valve port).

The suction element 26 includes a circular plate 42 at an upper portion. The circular plate 42 is separated from the cover portion at the upper end of the tube 30. A first spring 44 is arranged between the circular plate 42 and the cover portion of the tube 30. The first spring 44 always biases the suction element 26 downward through the disk 42. A cylindrical projection 46 for positioning the first spring 44 is mounted at the center of the upper surface of the circular plate 42, and the projection 46 is inserted into the lower end portion of the first spring 44. The circular plate 42 is formed with a hole 48 for communicating the concave portion 26B of the suction element 26 with the space above the circular plate 42.

A bottom hole 50 is formed in the center of the upper portion of the plunger 28, and a second spring 52 is disposed inside the hole 50. The second spring 52 biases the attraction member 26 and the plunger 28 in a direction to separate the attraction member 26 and the plunger 28 from each other.

As shown in fig. 1, in an axially intermediate portion of the inner peripheral portion of the nut 32, a convex portion 32B serving as a stopper that abuts against the upper surface of the main valve body 24 to limit the upward movement amount of the main valve body 24 is formed to protrude radially inward of the nut 32. In normal operation (when solenoid 40 is not energized), a gap of dimension L2 is provided between projection 32B and main spool 24. The dimension L2 is a dimension in which the main valve spool 24 can move in the axial direction inside the main valve chamber 22, and is also a dimension of a gap that can be formed between a main valve pad 56 and a main valve seat 58, which will be described later. The dimension L2 is, for example, about 2mm, but the dimension L2 is appropriately changed as needed.

The plunger 28 of the present embodiment has a function as a pilot valve element, and a pilot valve gasket 54 is attached to the lower end. The pilot valve portion 16 is constituted by the pilot valve pad 54 and the pilot valve seat 24A formed on the upper portion of the main valve element 24. Further, a pilot valve chamber 55 is provided between the plunger 28 and the main spool 24.

A pilot passage 24B that can communicate the pilot valve chamber 55 and the outflow port 20 is formed in the axial center portion of the main valve spool 24.

An annular main valve gasket 56 is mounted at the lower end of main valve spool 24. The main valve portion 14 is constituted by the main valve packing 56 and a main valve seat 58 formed between the inflow port 18 and the outflow port 20 of the valve main body 12.

The suction element 26 and the main valve body 24 are connected by two interlocking members 60 formed in a pin shape, and the suction element 26 and the main valve body 24 are integrally movable in the axial direction in the pipe 30. As shown in fig. 2, the two interlocking members 60 are disposed on both sides of the suction element 26 and the outer peripheral side of the main valve body 24 with an axial center portion interposed therebetween. A groove 62 into which the interlocking member 60 is inserted is formed in the axial direction on the outer peripheral surface of the plunger 28.

As shown in fig. 1, the attraction element 26 and the plunger 28 are biased in a direction away from each other by the second spring 52, and a gap of a dimension L1 is formed between the attraction element 26 and the plunger 28 in a normal state (when the solenoid 40 is not energized). The dimension L1 is set smaller than the dimension L2 described above. Although the dimension L1 is about 0.3 to 0.5mm as an example, the dimension L1 can be appropriately changed as needed.

The attraction element 26 made of a magnetic material is magnetized when the solenoid 40 is energized by an appropriate control mechanism (not shown), and attracts the plunger 28 against the elastic force of the second spring 52.

Since the suction element 26 is biased downward by the first spring 44 and the plunger 28 is biased downward by the second spring 52, the pilot valve pad 54 of the plunger 28 is in contact with the pilot valve seat 24A of the main valve spool 24 at the normal time (when the solenoid 40 is not energized), and the pilot valve portion 16 is in the closed state. In addition, in normal operation, the main valve body 24 is biased toward the main valve seat 58 by the disk 42 biased by the first spring 44, the suction element 26, and the interlocking member 60, and the main valve pad 56 abuts against the main valve seat 58, so that the main valve portion 14 is in a closed state.

In normal operation, the pressure acting on the inflow port 18 (the high pressure relative to the outflow port 20) acts on the main valve chamber 22, and also acts on the upper side of the main valve chamber 22, that is, also acts on the pilot valve chamber 55. The pressure acting on the inflow port 18 acts on the pilot valve chamber 55 side because the pilot valve chamber 55 and the main valve chamber 22 communicate with each other through a gap (a narrow gap not shown in fig. 1) formed between the main spool 24 and the main valve chamber 22.

(Action, effect)

Next, the operation and effects of the pilot-operated solenoid valve 10 according to the first embodiment will be described with reference to fig. 3 (a) to 3 (D).

Fig. 3 a shows a main portion of the pilot solenoid valve 10 when the solenoid 40 is not energized (energized and disconnected). When the solenoid 40 is not energized, the pilot valve gasket 54 of the plunger 28 abuts against the pilot valve seat 24A of the main valve spool 24, and the pilot valve portion 16 is in the closed state, and the main valve gasket 56 of the main valve spool 24 abuts against the main valve seat 58 of the valve main body 12, and the main valve portion 14 is in the closed state. Here, an operation in the case where the pressure of the fluid from the compressor, not shown, acts on the inlet 18 of the pilot solenoid valve 10, and a high differential pressure (hereinafter, appropriately referred to as a high differential pressure) is generated between the inlet 18 and the outlet 20 will be described. In this state, a large force acts on the main valve element 24 downward (in other words, toward the outflow port 20 side) due to the pressure of the fluid from the inflow port 18.

Fig. 3B shows a state of a main portion of the pilot type solenoid valve 10 when the solenoid 40 is energized (energized). When the solenoid 40 is energized by a suitable control unit (not shown), the attraction element 26 and the plunger 28 are magnetized, and the plunger 28 is attracted to the attraction element 26 against the urging force of the second spring 52. When the plunger 28 is attracted to the attraction element 26, the gap of the dimension L1 between the plunger 28 and the attraction element 26 disappears, and the pilot valve pad 54 of the plunger 28 is separated from the pilot valve seat 24A of the main valve spool 24 (the separation distance is the dimension L1), and the pilot valve portion 16 is in the valve-opened state.

The attraction element 26 to which the plunger 28 is attracted, and the plunger 28 and the attraction element 26 as one magnetic body (a coupling pair) are affected by the magnetic flux of the solenoid 40. That is, a force is received in a direction such that the axial center point of the coupling pair (precisely, the axial center point of the magnetic flux of the magnetized coupling pair) coincides with the axial center point of the magnetic flux of the solenoid 40. In the state of fig. 3 (B), since the axial center point of the attraction element 26 to which the plunger 28 is attracted is located below the axial center point of the magnetic flux of the solenoid 40, the upward attraction force F1 acts on the attraction element 26 to which the plunger 28 is attracted.

When the pilot valve portion 16 is in the open state, the pressure of the pilot valve chamber 55 is released to the relatively low-pressure outflow port 20 via the pilot passage 24B of the main valve body 24, and the pressure of the pilot valve chamber 55 decreases. As a result, the main valve body 24 is in a state in which the pressure on the main valve chamber 22 side of the main valve body 24 is relatively higher than the pressure on the pilot valve chamber 55 side of the main valve body 24, and the upward force F2 acts on the main valve body 24 by the pressure difference generated between the upper and lower sides of the main valve body 24, that is, the up-down differential pressure. The dimension L1 is not particularly limited as long as it is small enough that the pilot valve portion 16 is in the valve-opened state and the pressure of the pilot valve chamber 55 can be quickly released to the outflow port 20.

Accordingly, when the solenoid 40 is energized, the attractive force F1 and the upward force F2 generated by the up-down differential pressure of the main valve element 24 act on the main valve element 24, and as shown in fig. 3 (C), the main valve element 24 moves upward, the main valve pad 56 moves away from the main valve seat 58, and the main valve portion 14 is in the valve-opened state. Thereby, the fluid flows from the inflow port 18 to the outflow port 20.

Further, since the dimension L1 of the gap between the suction element 26 and the plunger 28 is smaller than the dimension L2 of the main valve spool 24 that is movable in the axial direction inside the main valve chamber 22, the plunger 28 is more easily sucked by the magnetized suction element 26, as compared with the case where the dimension of the gap between the suction element 26 and the plunger 28 is assumed to be L2 or more, and a larger suction force acts on the plunger 28.

Fig. 3 (D) shows a main portion of the pilot solenoid valve 10 when the solenoid 40 is not energized (energized/de-energized) from the state of fig. 3 (C).

When the solenoid 40 is turned from the energized state to the non-energized state, the plunger 28 receiving the biasing force of the second spring 52 is separated from the suction element 26, and the pilot valve pad 54 of the plunger 28 abuts against the pilot valve seat 24A of the main valve spool 24, so that the pilot valve portion 16 is in the valve-closed state.

Further, the main valve body 24 receiving the urging force of the first spring 44 moves toward the main valve seat 58, the main valve pad 56 abuts against the main valve seat 58, the main valve portion 14 is in the closed state, and the pilot type electromagnetic valve 10 returns to the closed state shown in fig. 3 (a).

(Supplementary explanation)

Next, the pilot-operated solenoid valve 100 having the conventional structure shown in fig. 4 is compared with the pilot-operated solenoid valve 10 of the present embodiment.

As shown in fig. 4, in the pilot solenoid valve 100 as an example of the conventional structure, a suction element 126 is fixed to the inner upper end side of a tube 130, and a plunger 128 is movably housed in the tube below the suction element 126. A solenoid, not shown, is provided on the outer peripheral side of the tube 130.

A coil spring 152 is disposed in the hole 150 formed in the upper portion of the plunger 128, and the coil spring 152 biases the fixed suction member 126 in a direction of pressing the plunger 128.

A ball 154 serving as a valve body that abuts against a pilot valve seat 124A formed in a main valve body 124 described later is fixed to the lower end of the plunger 128.

The main valve body 124 is slidably inserted into a cylindrical recess 134 formed in the valve body 112, and a tube 130 is fixed to an opening portion of the recess 134 via a ring 132.

The inner space of the recess 134 is divided vertically by the main valve core 124, and thus the upper side of the inner space is the pilot valve chamber 155, and the lower side of the inner space is the main valve chamber 122.

A pilot passage 124B is formed in the axial center portion of the main valve body 124, and a pilot valve seat 124A is formed in the upper portion of the main valve body 124. A seal ring 174 is attached to a groove formed in the outer peripheral portion of the main spool 124, and a main valve gasket 156 is attached to the lower portion of the main spool 124. The main valve gasket 156 can abut against a main valve seat 158 provided to the valve main body 112.

In the pilot solenoid valve 100, the main valve portion 114 is constituted by a main valve gasket 156 and a main valve seat 158 formed in the valve main body 112, and the pilot valve portion 116 is constituted by a ball 154 attached to a lower portion of the plunger 128 and a pilot valve seat 124A formed in an upper portion of the main valve spool 124.

An inflow port 118 communicating with a side portion of the main valve chamber 122 is provided at a side portion of the valve main body 112, and an outflow port 120 communicating with the main valve chamber 122 is provided at a lower portion of the valve main body 112.

In normal operation (when the plunger is not energized), the biasing force of the coil spring 152 acts on the plunger 128, and the ball 154 of the plunger 128 abuts against the pilot valve seat 124A of the main valve spool 124, so that the pilot valve portion 116 is in a valve-closed state. The main valve gasket 156 of the main valve body 124 abuts against the main valve seat 158 of the valve main body 112, and the main valve portion 114 is in a closed state. In normal times, a gap of dimension L1 is provided between the suction member 126 and the plunger 128.

In a state where the main valve gasket 156 of the main valve element 124 is in contact with the main valve seat 158, a gap of a dimension L2 is provided between the upper portion of the main valve element 124 and the ring 132. By moving the main valve body 124 upward by the dimension L2, the main valve gasket 156 is separated from the main valve seat 158, and a gap (dimension L2) through which fluid flows is formed between the main valve gasket 156 and the main valve seat 158. In other words, the dimension L2 is a lift amount by which the main spool 124 is moved upward.

Here, in order to set the pilot valve portion 116 to the open state, the ball 154 of the plunger 128 needs to be separated from the pilot valve seat 124A (the separation dimension is, for example, the dimension α (not shown)), and in order to set the pilot valve portion 116 to the open state and the main valve portion 114 to the open state, at least the plunger 128 needs to be moved by the dimension α+l2.

Therefore, in the pilot-operated solenoid valve 100 of the conventional structure, the dimension L1 of the gap between the suction element 126 and the plunger 128 (the dimension by which the plunger 128 moves) is larger than the dimension L2 of the gap between the upper portion of the main spool 124 and the ring 132 (the dimension by which the main spool 124 moves) by a dimension α (the dimension by which the pilot valve portion 116 is brought into the valve-opened state).

On the other hand, in the pilot solenoid valve 10 of the present embodiment, as shown in fig. 1, the dimension L1 in which the plunger 28 is moved toward the suction element 26 and sucked is smaller than the dimension L2 in which the main valve body 24 is separated from the main valve seat 58, so that the suction force acting on the plunger 28 can be increased, and the plunger 28 can be easily sucked by the suction element 26.

Here, as various conditions and examples, depending on the operating conditions of the equipment connected to the inflow port 18, the following may be used: a case where a large differential pressure is generated between the pilot valve chamber 55 and the main valve chamber 22 so that the main valve chamber 22 side is made higher than the pilot valve chamber 55 side, and a case where a small differential pressure or no differential pressure is generated between the pilot valve chamber 55 and the main valve chamber 22.

When the pilot-operated solenoid valve 10 of the present embodiment is closed (when both the main valve portion 14 and the pilot valve portion 16 are closed), or when the differential pressure between the main valve portion 14 and the pilot valve portion 16 is small or no differential pressure exists (that is, when the pressure does not act on the inflow port 18, or when the pressure in the inflow port 18=the pressure in the outflow port 20), the force pushing the main valve body 24 by the pressure of the fluid is small or no.

However, in the pilot solenoid valve 10 of the present embodiment, since the main valve body 24 is coupled to the suction element 26 by the interlocking member 60, the suction element 26 to which the plunger 28 is adsorbed can be moved upward when the solenoid 40 is energized, and therefore, even when the above-described differential pressure due to the fluid is not generated, the main valve body 24 coupled to the suction element 26 can be moved upward, and the main valve portion 14 can be easily brought into the valve-opened state.

In the pilot-operated solenoid valve 100 of the conventional structure, when the differential pressure between the main valve chamber 122 and the pilot valve chamber 155 is small or when no differential pressure is generated between the main valve chamber 122 and the pilot valve chamber 155, the force to move the main valve body 124 upward is insufficient, and the main valve portion 114 is difficult to open. Accordingly, in the pilot solenoid valve 100 of the conventional structure, in order to facilitate upward movement of the main spool 124, a coil spring 176 that biases the main spool 124 toward the pilot valve chamber 155 (i.e., in the valve opening direction) and facilitates valve opening is provided in the main valve chamber 122.

However, if coil spring 176 is provided in main valve chamber 122, when fluid rapidly flows from the side of main valve chamber 122, coil spring 176 moves in main valve chamber 122, and coil spring 176 is caught between main spool 124 and main valve seat 158 in the open valve state.

On the other hand, in the pilot-operated solenoid valve 10 of the present embodiment, as described above, the main valve portion 14 can be brought into the valve-open state even if no differential pressure is generated, and therefore, there is no need to provide a coil spring for biasing the main valve body 24 toward the pilot valve chamber 55 side in the main valve chamber 22, and there is no risk of biting the coil spring.

As described above, in the pilot-operated solenoid valve 10 of the present embodiment, even when the inlet port 18 side and the outlet port 20 side are at a high differential pressure, and when no differential pressure is generated between the main valve chamber 22 and the pilot valve chamber 55, the main valve portion 14 can be reliably placed in the valve-open state.

Second embodiment

Next, a pilot-operated solenoid valve 10 according to a second embodiment of the present utility model will be described with reference to fig. 5 and 6. The same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The pilot-operated solenoid valve 10 according to the second embodiment is different from the first embodiment in that a magnetic pole 40D is provided at an upper portion of a pipe 30 as shown in fig. 5. The magnetic pole 40D is formed in a cylindrical shape, and is disposed between an upper portion of an inner periphery of the coil bobbin 40B and an upper end portion of the tube 30 so as to extend in an axial direction of the tube 30. The magnetic pole 40D is disposed above the attraction element 26 and contacts the upper portion of the yoke 40C.

By providing the magnetic pole 40D at the upper portion of the tube 30, the cross-sectional area through which the magnetic flux flows can be increased, and the magnetic flux when the solenoid 40 is energized can be increased. In particular, the attraction element 26 and the magnetic pole 40D are arranged so that there is a portion where the upper portion of the attraction element 26 overlaps the magnetic pole 40D in the axial direction at both the upper position (when the power is on) and the lower position (when the power is off) of the attraction element 26, so that the magnetic flux between the upper portion of the attraction element 26 and the yoke 40C can be increased in the axial direction when the attraction element 26 is located at the lower position.

That is, when the solenoid 40 is energized, the magnetic flux generated in the attraction element 26 and the plunger 28 can be increased. Therefore, the suction force between the suction element 26 and the plunger 28 increases, and even when the differential pressure between the inlet 18 and the outlet 20 (to be precise, the differential pressure between the pilot passage 24B and the pilot valve chamber 55) is larger, the pilot passage 24B can be opened.

Further, the action of the suction member 26 and the plunger 28 is the same as the first embodiment.

(Action, effect)

Next, the operation and effects of the pilot-operated solenoid valve 10 according to the second embodiment will be described with reference to fig. 6 (a) to (D).

Fig. 6a shows a main portion of the pilot solenoid valve 10 when the solenoid 40 is not energized (energized and disconnected). When the solenoid 40 is not energized, the pilot valve gasket 54 of the plunger 28 abuts against the pilot valve seat 24A of the main valve spool 24, and the pilot valve portion 16 is in the closed state, and the main valve gasket 56 of the main valve spool 24 abuts against the main valve seat 58 of the valve main body 12, and the main valve portion 14 is in the closed state. Here, an operation in the case where the pressure of the fluid from the compressor, not shown, acts on the inflow port 18 of the pilot solenoid valve 10 will be described.

Fig. 6B shows a main portion of the pilot solenoid valve 10 when the solenoid 40 is energized (the energization is turned on). When solenoid 40 is energized by an appropriate control unit (not shown), attraction element 26 and plunger 28 magnetize.

Although a downward force acts on magnetized suction element 26, main valve pad 56 of main valve element 24 connected by interlocking member 60 abuts against main valve seat 58, so suction element 26 does not move. On the other hand, when the plunger 28 is magnetized, an upward force (larger than a downward force of the attraction member 26) acts on the plunger 28, and further, an attractive force from the attraction member 26 acts on the plunger 28.

Further, since the dimension L1 of the gap between the suction element 26 and the plunger 28 is smaller than the dimension L2 in which the main valve spool 24 can move in the axial direction inside the main valve chamber 22, a larger suction force acts on the plunger 28 and the plunger 28 is more easily sucked by the magnetized suction element 26 than in the case where the dimension L2 of the gap between the suction element 26 and the plunger 28 is assumed.

By the plunger 28 being attracted to the suction element 26, the gap of the dimension L1 between the plunger 28 and the suction element 26 disappears, and the pilot valve pad 54 of the plunger 28 is separated from the pilot valve seat 24A of the main valve spool 24 (the separation distance is the dimension L1), and the pilot valve portion 16 is in the valve-opened state.

Fig. 6 (C) shows the following operation of fig. 6 (B).

When the pilot valve portion 16 is in the open state, the pressure of the pilot valve chamber 55 is released to the relatively low-pressure outflow port 20 via the pilot passage 24B of the main valve body 24, and the pressure of the pilot valve chamber 55 decreases. As a result, the pressure on the main valve chamber 22 side of the main valve body 24 is relatively higher than the pressure on the pilot valve chamber 55 side of the main valve body 24, and an upward force acts on the main valve body 24 by a pressure difference generated between the upper and lower sides of the main valve body 24, that is, an up-and-down differential pressure.

Accordingly, both an upward force due to the differential pressure between the upper and lower sides of the main valve body 24 and an upward force due to the electromagnetic force acting on the main valve body 24 from the suction element 26 act on the main valve body 24, and as shown in fig. 6 (C), the main valve body 24 moves upward, and the main valve portion 14 is in the valve-opened state.

Fig. 6 (D) shows a main portion of the pilot solenoid valve 10 when the solenoid 40 is not energized (energized/de-energized) from the state of fig. 6 (C).

When the solenoid 40 is turned from the energized state to the non-energized state, the plunger 28 receiving the biasing force of the second spring 52 is separated from the suction element 26, and the pilot valve pad 54 of the plunger 28 abuts against the pilot valve seat 24A of the main valve spool 24, so that the pilot valve portion 16 is in the valve-closed state.

Further, the main valve body 24 receiving the urging force of the first spring 44 moves toward the main valve seat 58, the main valve pad 56 abuts against the main valve seat 58, the main valve portion 14 is in the closed state, and the pilot type electromagnetic valve 10 returns to the closed state shown in fig. 6 (a).

The pilot-operated solenoid valve 10 of the second embodiment is also similar to the pilot-operated solenoid valve 10 of the first embodiment in that the main valve body 24 is connected to the suction element 26 via the interlocking member 60, and the suction element 26 that sucks the plunger 28 and is integrated with the plunger 28 moves upward when the solenoid 40 is energized, so that even when the above-described differential pressure due to the fluid does not occur, the main valve body 24 connected to the suction element 26 can be moved upward, and the main valve portion 14 can be easily brought into the valve-opened state.

The pilot-operated solenoid valve 10 of the present embodiment can reliably open and close the main valve portion 14 even when the inlet 18 side and the outlet 20 side are at a high differential pressure, and when no differential pressure is generated between the main valve chamber 22 and the pilot valve chamber 55, as in the pilot-operated solenoid valve 10 of the first embodiment.

Third embodiment

Next, a pilot-operated solenoid valve 10 according to a third embodiment of the present utility model will be described with reference to fig. 7. The same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 7, in the pilot-operated solenoid valve 10 of the present embodiment, the projection 46 provided on the disk 42 is formed of a magnet. As an example, one side in the radial direction of the magnet is magnetized as an S pole, and the opposite side is magnetized as an N pole.

A cover 66 is provided on the upper portion of the valve main body 12 to cover the solenoid 40.

A control board 68 is provided at an interval above the solenoid 40 in the cover 66.

A magnetic sensor 70 for detecting the intensity of magnetic flux density is provided on the lower surface of the control board 68, and an electrical component such as a microcomputer 72 is mounted on the upper surface of the control board 68.

The magnetic sensor 70 of the present embodiment is a hall element, but a magnetic sensor other than a hall element may be used, and a magnetoresistive element or the like may be used as an example.

The microcomputer 72 can detect the position of the main valve 24 connected to the magnet (boss 46) via the disk 42, the suction element 26, and the interlocking member 60, that is, the open/close state of the main valve portion 14, based on the intensity of the magnetic flux density detected by the magnetic sensor 70.

When the magnet is located close to the magnetic sensor 70, the hall output voltage increases due to the strong magnetic flux density, and when the magnet is located far from the magnetic sensor 70, the hall output voltage decreases due to the weak magnetic flux density, and by measuring the hall output voltage, the operation of the attraction element 26, which is the near-far distance of the magnet, can be detected. Since the suction element 26 and the main valve body 24 are coupled by the interlocking member 60, the operation of the main valve body 24 can be determined by the operation of the suction element 26, and the open/closed state of the main valve portion 14 can be determined.

In the present embodiment, the protrusion 46 is a magnet, but the magnet may be provided at a position different from the protrusion 46, and the position where the magnetic sensor 70 is disposed may be not limited to the upper side of the tube 30 but the side of the tube 30.

Fourth embodiment

Next, a pilot-operated solenoid valve 10 according to a fourth embodiment of the present utility model will be described with reference to fig. 8. The pilot solenoid valve 10 according to the fourth embodiment is a modification of the pilot solenoid valve 10 according to the third embodiment, and the same components as those of the third embodiment are denoted by the same reference numerals, and the description thereof is omitted. Here, only the differences from the configuration of the pilot-operated solenoid valve 10 according to the third embodiment will be described.

In the above-described embodiment, the suction element 26 and the main spool 24 are connected by the pair of interlocking members 60, but in the pilot solenoid valve 10 of the present embodiment, as shown in fig. 8, the suction element 26 and the main spool 24 are connected by one interlocking member 60.

Specifically, the single interlocking member 60 freely moves through the suction element 26, the second spring 52, the pilot valve pad 54, and the axial center portion of the plunger 28. The interlocking member 60 has an upper end fixed to the suction element 26 and a lower end fixed to the main valve body 24, and the suction element 26 moves integrally with the main valve body 24.

In the present embodiment, the pilot passage 24B of the main valve body 24 is constituted by a large diameter hole 24Ba and a plurality of fine holes 24Bb, and the fine holes 24Bb are closed by the pilot valve gasket 54 of the plunger 28.

In the main spool 24 of the present embodiment, a pressure equalizing hole 64 is formed to communicate the pilot valve chamber 55 and the main valve chamber 22. The pressure equalizing hole 64 communicates the main valve chamber 22 and the pilot valve chamber 55, and the cross-sectional area of the pressure equalizing hole 64 is smaller than the cross-sectional area of the pilot passage 24B (the total cross-sectional area of the fine holes 24 Bb).

Fifth embodiment

Next, a pilot-operated solenoid valve 10 according to a fifth embodiment of the present utility model will be described with reference to fig. 9. In the above-described embodiment, the suction element 26 and the main valve element 24 are fixed (fixedly coupled) by the interlocking member 60, so that the main valve portion 14 can be brought into the valve-opened state even if there is no differential pressure, without providing a coil spring for biasing the main valve element 24 toward the pilot valve chamber 55 side in the main valve chamber 22.

In the fifth embodiment shown in fig. 9, the suction element 26 and the main valve element 24 are connected by the interlocking member 60 so as not to be fixed (fixed connection) by providing the coil spring 80 as the third spring in the main valve chamber 22.

Specifically, the interlocking member 60 is allowed to freely move through the groove 62 provided in the through plunger 28, and the interlocking member 60 is not fixed to either the suction element 26 or the main valve element 24. The main valve chamber 22 is constantly biased by a coil spring 80 inside the main valve 24. The interlocking member 60 is pressed against the lower surface portion of the suction element 26 and the upper surface portion of the main valve element 24, respectively. This allows the attraction element 26 to be interlocked (synchronized) with the main valve body 24. With such a configuration, the interlocking member 60 does not need to be fixed to the suction element 26 and the main valve element 24, and thus the man-hour for manufacturing can be reduced.

Other embodiments

Further, as in the above-described embodiment, if the first force is an upward force, the plunger 28 can move upward to open the pilot passage 24B even if the differential pressure between the pilot valve chamber and the outflow port becomes small, but the positions of the solenoid 40 and the attraction element 26 may be set so that the force (first force) acting on the coupling pair of the magnetic bodies in which the plunger 28 is attracted to the attraction element 26 becomes a downward force.

In this case, when the differential pressure between the inlet 18 and the outlet 20 is small, the pilot passage 24B is not opened. That is, when the first force is downward, the valve is opened to the main valve seat 58 (main valve port) when the second force is upward and greater than the first force.

In the first embodiment, the suction element 26 and the main spool 24 are connected by two (a pair of) interlocking members 60, but the suction element 26 and the main spool 24 may be connected by three or more interlocking members 60.

While the above description has been given of an embodiment of the present utility model, the present utility model is not limited to the above, and can be implemented by various modifications other than the above, without departing from the spirit thereof.

Claims (7)

1. A pilot-operated solenoid valve, comprising:

A valve body having an inlet and an outlet for fluid and a housing chamber having a main valve seat between the inlet and the outlet;

A main valve body that divides an interior of the housing chamber into a main valve chamber and a pilot valve chamber that communicate with the inflow port, a pilot passage that can communicate the main valve chamber and the pilot valve chamber is formed, a pilot valve seat is formed on the pilot valve chamber side of the pilot passage, and the main valve body is disposed so as to be movable in the interior of the housing chamber and can abut against the main valve seat, and constitutes a main valve portion together with the main valve seat;

A suction element made of a magnetic material, the suction element being disposed so as to be separated from the main valve element toward the pilot valve chamber;

an interlocking member that interlocks the suction element and the main valve element;

a first spring that biases the suction element toward the main valve element;

A plunger made of a magnetic material, the plunger being provided between the suction element and the main valve element so as to be movable, an end portion of the plunger on the main valve element side being capable of abutting against the pilot valve seat, and forming a pilot valve portion together with the pilot valve seat;

A second spring disposed between the suction element and the plunger, and configured to bias the plunger toward the main valve element;

A housing body fixed to the valve main body, the housing body housing the plunger and the suction element so as to be movable; and

And a solenoid that is externally inserted into the housing and that attracts the suction element and the plunger when energized.

2. The pilot-operated solenoid valve as set forth in claim 1, wherein,

The main valve element is provided in the housing chamber so as to be movable by a dimension L2 in a direction away from the main valve seat along a moving direction of the plunger from a state of contact with the main valve seat,

In a non-energized state of the solenoid, a gap of a dimension L1 smaller than the dimension L2 is formed by receiving the urging force of the first spring between the attraction element and the plunger.

3. The pilot-operated solenoid valve according to claim 1 or 2, comprising:

A magnet coupled to the attraction element; and

And a magnetic sensor provided in the housing and detecting a magnetic flux density of the magnet.

4. The pilot-operated solenoid valve as set forth in claim 1, wherein,

The structure is as follows: when the solenoid is energized, the plunger and the attraction element are moved in a direction away from the main valve seat against the urging force of the first spring.

5. The pilot-operated solenoid valve as set forth in claim 1, wherein,

The valve body is provided with a third spring which applies force to the main valve core to the suction element side,

The interlocking member is sandwiched between the main valve element and the attraction element.

6. The pilot-operated solenoid valve as set forth in claim 1, wherein,

The suction element and the main valve core are connected through a plurality of linkage parts.

7. The pilot-operated solenoid valve as set forth in claim 1, wherein,

The suction element is connected with the main valve core through one linkage component.