JP2022186293A - Electric driving valve - Google Patents

Abstract

To provide a solenoid valve capable of suppressing the operation failure of a main valve body.SOLUTION: A main valve body 40 of a solenoid valve 1 has an annular projecting portion 47 projecting upward in a pilot valve chamber 37. In a valve closing state, an upper end 47c of the projecting portion 47 separates from a ceiling surface 37a of the pilot valve chamber 37. In a valve opening state, the upper end 47c of the projecting portion 47 contacts with the ceiling surface 37a of the pilot valve chamber 37, and the pilot valve chamber 37 is divided into a center space 37A inside the projecting portion 47 and an annular peripheral edge space 37B outside. The peripheral edge space 37B is connected to a clearance C between an outer peripheral surface 42a of an upper flange portion 42 of the main valve body 40 and an inner peripheral surface 22a of a large diameter cylinder portion 22. The projecting portion 47 has a slit 47b connecting the center space 37A and the peripheral edge space 37B.SELECTED DRAWING: Figure 3

Description

The present invention relates to electrically actuated valves.

Patent Literature 1 discloses a pilot-type solenoid valve, which is an example of a conventional electrically driven valve. This electromagnetic valve is incorporated in, for example, the refrigeration cycle of an air conditioner and used for switching the refrigerant flow path. A solenoid valve has a valve body with a main valve port. A suction element is coupled to the valve body. The attractor is a fixed iron core and has a large-diameter cylindrical portion and a small-diameter cylindrical portion. The large-diameter cylindrical portion and the small-diameter cylindrical portion are integrally connected. The large diameter cylindrical portion is coupled to the valve body. A main valve body is arranged inside the large-diameter cylindrical portion. The main valve body separates the main valve chamber and the pilot valve chamber. The main valve body opens and closes the main valve opening connected to the main valve chamber. The small-diameter cylindrical portion protrudes from the valve body. The small-diameter cylindrical portion is fitted with a cylindrical case. One end of the case is welded to the small-diameter cylindrical portion. The suction element forms part of the valve body. An electromagnetic coil is arranged outside the case. A plunger is arranged inside the case. The plunger is urged away from the attractor by a plunger spring. A pilot valve body is connected to the plunger via a valve shaft passing through the inner side of the small-diameter cylindrical portion. The pilot valve body opens and closes a pilot valve port in the main valve body.

When the electromagnetic coil is energized, the attractor and plunger are magnetized and the plunger approaches the attractor. A pilot valve disc moves with the plunger, closing the pilot valve port and pushing the main valve disc toward the main valve port. Then, the main valve body closes the main valve port, and the solenoid valve is closed.

When the electromagnetic coil is de-energized, the magnetization between the plunger and the attractor is eliminated, and the plunger is pushed away from the attractor by the plunger spring. A pilot valve body moves with the plunger to open the pilot valve port. Refrigerant flows from the pilot valve chamber through the pilot valve opening to the main valve opening, and the refrigerant pressure in the pilot valve chamber becomes lower than the refrigerant pressure in the main valve chamber. Then, the main valve body is separated from the main valve port, the main valve port is opened, and the solenoid valve is in the open state.

JP 2019-7572 A

The main valve body of the above-described solenoid valve has an annular protrusion arranged on the peripheral edge of its upper surface, and a pressure equalizing passage that is a through hole that connects the main valve chamber and the pilot valve chamber. there is In the valve open state, the projection contacts the ceiling surface, which is the inner surface of the pilot valve chamber. Therefore, in the valve open state, the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the large-diameter cylindrical portion forms a blind alley where the refrigerant stays. In addition, since the viscosity of the lubricating oil contained in the refrigerant increases in a low temperature state, there is a possibility that malfunction of the main valve body may occur. Moreover, since a through-hole having a small diameter is formed as the pressure equalizing passage, the manufacturing cost increases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrically driven valve capable of suppressing malfunction of the main valve body.

To achieve the above object, an electrically driven valve according to one aspect of the present invention provides a valve body having a main valve chamber and a pilot valve chamber; An electrically driven valve having a main valve body for opening and closing a main valve opening connected to a chamber, and a pilot valve body for opening and closing a pilot valve opening connecting the main valve opening and the pilot valve chamber, The main valve chamber and the pilot valve chamber are connected via a gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body, and the main valve body is arranged around the pilot valve port. and a projection projecting in the sliding direction of the main valve body, and a connecting passage connecting the inside and the outside of the projection.

According to the present invention, the main valve chamber and the pilot valve chamber are connected via the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body. The main valve body is arranged around the pilot valve port and has a projection projecting in the sliding direction of the main valve body and a connection passage connecting the inside and the outside of the projection. With this arrangement, in the valve open state, refrigerant flows from the main valve chamber to the pilot valve chamber through the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body. Therefore, it is possible to prevent the refrigerant from remaining in the gap, thereby suppressing malfunction of the main valve body. Also, the pressure equalizing passage that penetrates the main valve body can be omitted, and the manufacturing cost can be reduced.

In order to achieve the above object, an electrically driven valve according to another aspect of the present invention defines a valve body having a main valve chamber and a pilot valve chamber, the main valve chamber and the pilot valve chamber, An electrically driven valve having a main valve body that opens and closes a main valve port connected to the main valve chamber, and a pilot valve body that opens and closes a pilot valve port that connects the main valve port and the pilot valve chamber. The outer peripheral surface of the main valve body is slidably in contact with the inner peripheral surface of the valve body, and the main valve body has an annular convex portion projecting in the sliding direction in the pilot valve chamber. , in a valve closed state in which the main valve port is closed, the tip of the convex portion is separated from the inner surface of the pilot valve chamber, and in a valve open state in which the main valve port is open, the tip of the convex portion is separated from the pilot valve chamber. The pilot valve chamber is divided into a central space inside the convex portion and an annular peripheral space outside the convex portion, and the peripheral space is defined by the outer peripheral surface of the main valve element and the valve body. It is characterized in that the convex portion has a connection passage that is connected to the gap with the inner peripheral surface and that connects the central space and the peripheral space.

According to the present invention, the main valve body has the annular projection projecting in the sliding direction in the pilot valve chamber. In the valve closed state in which the main valve port is closed, the tip of the projection is separated from the inner surface of the pilot valve chamber. In the valve open state in which the main valve port is open, the tip of the projection contacts the inner surface of the pilot valve chamber, and the pilot valve chamber is divided into a central space inside the projection and an annular peripheral space outside. . A peripheral space is connected to the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body. The projection has a connecting passage that connects the central space and the peripheral space. As a result, when the valve is open, the refrigerant flows from the main valve chamber into the peripheral space through the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body, and flows in the peripheral space in the peripheral direction. It flows into the central space through connecting passages. Therefore, it is possible to prevent the refrigerant from staying in the clearance and the peripheral space, and to suppress malfunction of the main valve body. Also, the pressure equalizing passage that penetrates the main valve body can be omitted, and the manufacturing cost can be reduced.

In the present invention, it is preferable that the main valve body has the pilot valve port, and one end of the pilot valve port opens inside the convex portion. By doing so, when switching from the valve closed state to the valve open state, the refrigerant can quickly flow from the pilot valve chamber to the main valve port via the pilot valve port.

In the present invention, the electrically driven valve further includes a piston ring that seals a gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body, and the piston ring serves as the main valve in the gap. It is preferable to have a passage connecting the portion on the valve chamber side and the portion on the pilot valve chamber side. By doing so, the amount of refrigerant corresponding to the size of the passage of the piston ring can flow through the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body.

In the present invention, it is preferable that the outer peripheral surface of the convex portion is a tapered surface in which the diameter decreases toward the tip. By doing so, the convex portion can be formed by a process similar to general chamfering. Therefore, the volume of the peripheral space can be secured relatively easily, and the increase in manufacturing cost can be suppressed.

In the present invention, it is preferable that the outer diameter of the convex portion is smaller than the diameter of the outer peripheral surface of the main valve body. By doing so, the volume of the peripheral space can be ensured by the convex portion that can be formed relatively easily.

In the present invention, it is preferable that the outer peripheral surface of the main valve body or the inner peripheral surface of the valve body has a connection groove that connects the main valve chamber and the peripheral space in the valve open state. By doing so, in the valve open state, the refrigerant can flow more reliably from the main valve chamber through the connecting groove into the peripheral space, and the accumulation of the refrigerant in the peripheral space can be suppressed.

ADVANTAGE OF THE INVENTION According to this invention, the malfunction of a main valve body can be suppressed.

FIG. 3 is a cross-sectional view of the solenoid valve in an open state according to one embodiment of the present invention; FIG. 2 is a cross-sectional view of the electromagnetic valve of FIG. 1 in a closed state; FIG. 2 is an enlarged sectional view of the solenoid valve of FIG. 1; FIG. 2 is a diagram showing a main valve body included in the solenoid valve of FIG. 1; It is a figure which shows the modification of the main valve body of FIG.

A pilot solenoid valve according to an embodiment of the electrically driven valve of the present invention will be described below with reference to FIGS. 1 to 5. FIG.

1 and 2 are cross-sectional views of an electromagnetic valve according to one embodiment of the present invention. FIG. 1 shows the solenoid valve in the open state, and FIG. 2 shows the solenoid valve in the closed state. 3 is an enlarged sectional view of the solenoid valve of FIG. 1. FIG. FIG. 3 shows the main valve body of the solenoid valve of FIG. 1 and its vicinity. FIG. 4 is a diagram showing a main valve element of the solenoid valve of FIG. 1. FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a cross-sectional view taken along line IVC-IVC in FIG. 4A. 5 is a diagram showing a modification of the main valve body of FIG. 4. FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a cross-sectional view taken along line VC-VC in FIG. 5A. In the following description, the terms "up, down, left, and right" indicate the relative positional relationship of the constituent elements shown in each drawing.

As shown in FIGS. 1 to 3, the solenoid valve 1 according to this embodiment includes a valve body 5, a case 32, a plunger 33, an electromagnetic coil 34, a valve shaft 35, a pilot valve body 36, and a main body. and a valve body 40 .

The valve body 5 has a body block 10 and a fixed iron core 20 (also referred to as an attractor).

The body block 10 has a substantially rectangular parallelepiped shape. The body block 10 has an inlet 11 , an outlet 12 , a main valve chamber 14 , a main valve port 15 and a main valve seat 16 . The body block 10 is made of, for example, an aluminum alloy.

The inlet 11 opens in the left side surface 10 a of the main block 10 . The outflow port 12 opens in the right side surface 10b of the main block 10. As shown in FIG. A circular main valve seat 16 surrounding a main valve port 15 is arranged in the main valve chamber 14 . The inflow port 11 is connected to the main valve chamber 14 . The main valve chamber 14 is connected to the outflow port 12 via the main valve port 15 . A mounting hole 17 connected to the main valve chamber 14 is opened in the upper surface 10 c of the main body block 10 .

The fixed core 20 connects the main block 10 and the case 32 . The fixed core 20 integrally has a large-diameter cylindrical portion 22 and a small-diameter cylindrical portion 23 . The large-diameter cylindrical portion 22 is arranged inside the mounting hole 17 of the main block 10 and coupled to the mounting hole 17 . Specifically, a male thread is formed on the outer peripheral surface of the large-diameter cylindrical portion 22 , a female thread is formed on the inner peripheral surface of the mounting hole 17 , and the large-diameter cylindrical portion 22 is threadedly connected to the mounting hole 17 of the main block 10 . It is The outer diameter of the small-diameter cylindrical portion 23 is smaller than the inner diameter of the large-diameter cylindrical portion 22 . The small-diameter cylindrical portion 23 is coaxially connected to the upper end portion of the large-diameter cylindrical portion 22 . The small-diameter cylindrical portion 23 protrudes upward from the main block 10 . The fixed core 20 is made of metal having soft magnetism. The fixed core 20 is, for example, made of magnetic stainless steel (such as SUS430) or free-cutting steel having soft magnetism (such as SUM22).

Case 32 is made of stainless steel. The case 32 has a cylindrical shape with an open lower end 32a (one end) and a closed upper end. A small-diameter cylindrical portion 23 is arranged inside the lower end portion 32 a of the case 32 . A lower end portion 32 a of the case 32 is welded to the small-diameter cylindrical portion 23 .

Plunger 33 has a cylindrical shape. The outer diameter of plunger 33 is slightly smaller than the inner diameter of case 32 . The plunger 33 is arranged inside the case 32 so as to be vertically movable. A plunger spring 38 is arranged between the plunger 33 and the small-diameter cylindrical portion 23 of the fixed core 20 . The plunger spring 38 is a compression coil spring. A plunger spring 38 pushes the plunger 33 upward.

The electromagnetic coil 34 has a cylindrical shape. The inner diameter of the electromagnetic coil 34 is slightly larger than the outer diameter of the case 32 . The case 32 is inserted inside the electromagnetic coil 34 . The electromagnetic coil 34 is arranged outside the case 32 . Electromagnetic coil 34 magnetizes fixed core 20 and plunger 33 .

The valve shaft 35 has an elongated cylindrical shape. The upper end of the valve shaft 35 is fixed to the lower end of the plunger 33 . The valve shaft 35 is arranged inside the small-diameter cylindrical portion 23 of the fixed iron core 20 . The valve shaft 35 is supported by the small-diameter cylindrical portion 23 so as to be vertically movable. The valve stem 35 has a fluid passage 35a extending from its upper end to its lower end. The fluid passage 35 a is connected to the inner space of the plunger 33 .

The pilot valve body 36 is integrally connected to the lower end of the valve shaft 35 . The pilot valve body 36 is connected to the plunger 33 via the valve shaft 35 . A disc-shaped packing 36 a is attached to the lower surface of the pilot valve body 36 . The packing 36a is made of synthetic resin or synthetic rubber.

The main valve body 40 is shown in FIG. The main valve body 40 integrally has a body portion 41 , an upper flange portion 42 and a lower flange portion 43 . The trunk portion 41 has a columnar shape. The upper flange portion 42 has an annular shape. An inner peripheral edge of the upper flange portion 42 is connected to the upper portion of the body portion 41 . The upper flange portion 42 separates the main valve chamber 14 from the pilot valve chamber 37 inside the large-diameter cylindrical portion 22 . The lower flange portion 43 has an annular shape. An inner peripheral edge of the lower flange portion 43 is connected to the lower portion of the body portion 41 . The body portion 41 has a pilot valve port 45 penetrating vertically. The pilot valve port 45 connects the main valve port 15 and the pilot valve chamber 37 . Note that the main body block 10 may have a pilot valve port that connects the main valve port 15 and the pilot valve chamber 37 . An upper end portion of a pilot valve port 45 is opened in the upper end portion of the body portion 41, and a pilot valve seat 46 surrounding the pilot valve port 45 is arranged. The upper flange portion 42 is arranged inside the large-diameter cylindrical portion 22 of the fixed core 20 so as to be vertically movable. The outer peripheral surface 42a of the upper flange portion 42 is in contact with the inner peripheral surface 22a of the large-diameter cylindrical portion 22 (that is, the inner peripheral surface of the valve body 5) so as to be vertically slidable. A groove 42b is formed along the entire circumference of the outer peripheral surface 42a. An annular piston ring 48 is arranged in the groove 42b. The piston ring 48 is made of synthetic resin. An annular plate-shaped packing 43 a is attached to the lower surface of the lower flange portion 43 . The packing 43a is made of synthetic resin. The outer diameter of the lower flange portion 43 is smaller than the outer diameter of the upper flange portion 42 . A valve opening spring 39 is arranged between the upper flange portion 42 of the main valve body 40 and the main body block 10 . The valve opening spring 39 is a compression coil spring. The valve opening spring 39 pushes the main valve body 40 upward.

The piston ring 48 is arranged coaxially with the upper flange portion 42 of the main valve body 40 . The piston ring 48 has a gap between the outer peripheral surface 42a of the upper flange portion 42 of the main valve body 40 and the inner peripheral surface 22a of the large-diameter cylindrical portion 22 (hereinafter also simply referred to as "gap C"). and a portion on the pilot valve chamber 37 side.

The piston ring 48 has a slit 48a. The slit 48a is formed by cutting a part of the piston ring 48 with a predetermined width. The slit 48a is a passage that connects a portion of the clearance C on the main valve chamber 14 side and a portion on the pilot valve chamber 37 side. The channel cross-sectional area of the slit 48 a is smaller than the channel cross-sectional area of the pilot valve port 45 . The gap C and the slit 48 a are a pressure equalizing passage that connects the main valve chamber 14 and the pilot valve chamber 37 . The slit 48a is the portion with the smallest flow passage cross-sectional area in the pressure equalizing passage. It is relatively easy to adjust the width of the slit 48a. The pressure equalizing passage including the slit 48a can easily obtain a smaller flow passage cross-sectional area than the pressure equalizing passage penetrating the main valve body 40. As shown in FIG. In addition, the pressure equalizing passage including the slit 48a lowers the machining accuracy required for each part (the main valve body 40 and the fixed iron core 20) compared to the pressure equalizing passage including only the gap C without the piston ring 48. be able to.

As shown in FIG. 4B, the slit 48a has a linear shape and is inclined with respect to the axial direction of the piston ring 48. As shown in FIG. The slit 48 a can have a smaller flow passage cross-sectional area than a slit parallel to the axial direction of the piston ring 48 . In addition, the slit of the piston ring 48 is not limited to a linear shape. For example, the slit may have a crank shape. The crank-shaped slit has a transverse cut, one longitudinal cut and the other longitudinal cut. The transverse cut portion extends circumferentially of the piston ring 48 . One longitudinal cut is connected to one end of the transverse cut and the other longitudinal cut is connected to the other end of the transverse cut. One longitudinal cut and the other longitudinal cut extend axially in opposite directions from the end of the transverse cut. The width of one longitudinal cut and the width of the other longitudinal cut are greater than the width of the transverse cut. The crank-shaped slit can suppress the change in the cross-sectional area of the flow path due to the deflection of the piston ring 48 . If the piston ring 48 is made of a rubber material, the groove-shaped passage may be formed without cutting the piston ring 48 .

The upper flange portion 42 has an annular convex portion 47 . The convex portion 47 is arranged on the peripheral portion of the upper surface 42 c of the upper flange portion 42 . The convex portion 47 protrudes upward (ie, in the sliding direction) from the upper surface 42c. An outer peripheral surface 47a of the projection 47 is an annular tapered surface whose diameter decreases from bottom to top. The convex portion 47 has one slit 47b that traverses in the radial direction.

The upper end 47c (tip) of the projection 47 is separated from the ceiling surface 37a, which is the inner surface of the pilot valve chamber 37, in the closed state. The upper end 47c of the convex portion 47 is in contact with the ceiling surface 37a over the entire circumferential direction when the valve is open. The convex portion 47 is in contact with the ceiling surface 37 a to divide the pilot valve chamber 37 into a central space 37 A inside the convex portion 47 and an annular peripheral space 37 B outside the convex portion 47 . Central space 37A and peripheral space 37B are connected via slit 47b. The slit 47b is a connecting passage. The peripheral space 37B is connected to the gap C. The radial width of the peripheral space 37B is larger than the gap C. As shown in FIG. The peripheral space 37B may be formed by increasing the diameter of the upper end portion of the inner peripheral surface 22a of the large-diameter cylindrical portion 22. As shown in FIG.

In addition, in the solenoid valve 1, instead of the main valve body 40 shown in FIG. 4, a main valve body 40A shown in FIG. 5 may be adopted. The main valve body 40A has the same structure as the main valve body 40 except for the annular protrusion 47A. The outer peripheral surface 47a of the convex portion 47A is arranged along the vertical direction, and the outer diameter of the convex portion 47A (the outer diameter of the upper end 47c of the convex portion 47A) is smaller than the outer diameter of the upper flange portion . The convex portion 47A protrudes upward from the upper surface 42c. The convex portion 47A has one slit 47b that traverses in the radial direction. The convex portion 47A also functions in the same manner as the convex portion 47 does.

Next, an example of operation of the solenoid valve 1 will be described.

In the electromagnetic valve 1 shown in FIG. 1, the electromagnetic coil 34 is in a non-energized state. In this state, the main valve body 40 is positioned away from the main valve seat 16 and the main valve port 15 is open. The solenoid valve 1 is in an open state. In the valve open state, the pilot valve port 45 is open.

In the valve open state, the upper end 47c of the projection 47 is in contact with the ceiling surface 37a of the pilot valve chamber 37, and the pilot valve chamber 37 is divided into a central space 37A and an annular peripheral space 37B. Therefore, the refrigerant flows between the main valve chamber 14 and the central space 37A through the pressure equalizing passage (gap C, slit 48a), peripheral space 37B and slit 47b.

Then, when the electromagnetic coil 34 changes from the non-energized state to the energized state, the fixed core 20 and the plunger 33 are magnetized, and the plunger 33 approaches the fixed core 20 . The pilot valve body 36 moves together with the plunger 33 to close the pilot valve port 45 and push the main valve body 40 toward the main valve port 15 side. Then, the main valve body 40 closes the main valve port 15, and the solenoid valve 1 is closed as shown in FIG. In the closed state, the main valve body 40 is pushed toward the main valve port 15 by the refrigerant. In the valve closed state, the upper end 47c of the projection 47 is separated from the ceiling surface 37a of the pilot valve chamber 37, and the pilot valve chamber 37 becomes one space.

Then, when the electromagnetic coil 34 changes from the energized state to the non-energized state, the magnetization between the fixed core 20 and the plunger 33 is eliminated, and the plunger 33 is pushed by the plunger spring 38 to separate from the fixed core 20 . The pilot valve body 36 moves together with the plunger 33 and the pilot valve port 45 opens. Refrigerant flows from the pilot valve chamber 37 to the main valve opening 15 via the pilot valve opening 45 , and the refrigerant pressure in the pilot valve chamber 37 becomes lower than the refrigerant pressure in the main valve chamber 14 . Then, the main valve body 40 is separated from the main valve port 15, the main valve port 15 is opened, and the solenoid valve 1 is in the open state. When the pressure difference between the refrigerant pressure on the inflow port 11 side and the refrigerant pressure on the outflow port 12 side is very small, the pressure difference between the refrigerant pressure in the main valve chamber 14 and the refrigerant pressure in the pilot valve chamber 37 is small. In this case, the main valve body 40 is moved upward by the valve opening spring 39 to open the main valve port 15 .

The solenoid valve 1 according to this embodiment includes a valve body 5 having a main valve chamber 14 and a pilot valve chamber 37, a main valve chamber 14 and a pilot valve chamber 37 which are separated from each other, and a main valve connected to the main valve chamber 14. It has a main valve body 40 that opens and closes the port 15 and a pilot valve body 36 that opens and closes the pilot valve port 45 that connects the main valve port 15 and the pilot valve chamber 37 . The outer peripheral surface 42a of the upper flange portion 42 of the main valve body 40 is in slidable contact with the inner peripheral surface 22a of the large-diameter cylindrical portion 22 of the valve main body 5 . The upper flange portion 42 of the main valve body 40 has an annular convex portion 47 that protrudes upward in the pilot valve chamber 37 . The upper end 47c of the projection 47 is separated from the ceiling surface 37a of the pilot valve chamber 37 in the valve closed state in which the main valve port 15 is closed. In the valve open state in which the main valve port 15 is open, the upper end 47c of the projection 47 is in contact with the ceiling surface 37a of the pilot valve chamber 37, and the pilot valve chamber 37 is outside the central space 37A inside the projection 47. It is divided into an annular peripheral space 37B. The peripheral space 37B is connected to the gap C between the outer peripheral surface 42a and the inner peripheral surface 22a. The convex portion 47 has one slit 47b connecting the central space 37A and the peripheral space 37B.

As a result, when the valve is open, the refrigerant flows from the main valve chamber 14 through the gap C and the slit 48a into the peripheral space 37B, flows in the peripheral space 37B in the circumferential direction, passes through the slit 47b, and flows into the central space 37A. flow to The gap C and the slit 48a form a pressure equalizing passage that connects the main valve chamber 14 and the pilot valve chamber 37, and the slit 48a has the smallest flow passage cross-sectional area in the pressure equalizing passage. Therefore, the pressure equalizing passage penetrating the main valve body 40 can be omitted, and the manufacturing cost can be reduced.

Further, the outer peripheral surface 47a of the convex portion 47 is a tapered surface whose diameter decreases from the bottom to the top. By doing so, for example, compared to a configuration in which the peripheral space is formed by increasing the diameter of the upper end portion of the inner peripheral surface 22a of the large-diameter cylindrical portion 22, the peripheral space is formed by the convex portion that can be formed relatively easily. can be secured. Therefore, an increase in manufacturing cost can be suppressed. It should be noted that the same action and effect can be obtained with the configuration employing the convex portion 47A shown in FIG.

In the embodiment described above, the outer peripheral surface 42a of the upper flange portion 42 of the main valve body 40 may have a connection groove that connects the main valve chamber 14 and the peripheral space 37B in the valve open state. A slit 48a is arranged in the intermediate portion of the connecting groove. In this way, when the valve is open, the refrigerant can flow more reliably from the main valve chamber 14 through the connecting groove and the slit 48a into the peripheral space 37B, thereby suppressing the accumulation of the refrigerant in the peripheral space 37B. can be done. The connection groove is preferably connected to a position opposite to the slit 47b in the peripheral space 37B (a position rotated by 180 degrees). This makes it easier for the coolant in the peripheral space 37B to flow in the circumferential direction. The inner peripheral surface 22a of the large-diameter cylindrical portion 22 of the valve body 5 may have a connection groove.

Moreover, in the above-described embodiment, the protrusion 47 has the slit 47b, but the present invention is not limited to this configuration. For example, instead of the slit 47b, the upper end 47c of the projection 47 may be recessed in an arc shape having a relatively large radius to form a gap between the upper end 47c and the ceiling surface 37a of the pilot valve chamber 37 to form a connecting passage. good. The convex portion 47 may have one slit 47b or may have a plurality of slits 47b. About three is preferable.

Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments. A person skilled in the art may add, delete, or change the design of the above-described embodiments as appropriate, or combine the features of the embodiments as appropriate, as long as they do not conflict with the spirit of the present invention. included in the range of

DESCRIPTION OF SYMBOLS 1... Solenoid valve, 5... Valve body, 10... Body block, 10a... Left side, 10b... Right side, 10c... Top, 11... Inlet, 12... Outlet, 14... Main valve chamber, 15... Main valve port , 16... main valve seat, 17... mounting hole, 20... fixed iron core, 22... large-diameter cylindrical portion, 22a... inner peripheral surface, 23... small-diameter cylindrical portion, 32... case, 33... plunger, 34... electromagnetic coil, 35 Valve shaft 35a Fluid passage 36 Pilot valve body 36a Packing 37 Pilot valve chamber 37a Ceiling surface 37A Central space 37B Peripheral space 38 Plunger spring 39 Valve opening spring , 40... main valve element, 41... body portion, 42... upper flange portion, 42a... outer peripheral surface, 42b... groove, 42c... upper surface, 43... lower flange portion, 43a... packing, 45... pilot valve port, 46... pilot Valve seat 47, 47A Convex portion 47a Outer peripheral surface 47b Slit 47c Upper end 48 Piston ring 48a Slit C Gap

Claims (7)

a valve body having a main valve chamber and a pilot valve chamber; a main valve body that separates the main valve chamber from the pilot valve chamber and opens and closes a main valve port connected to the main valve chamber; and a pilot valve body that opens and closes a pilot valve port that connects the pilot valve chamber,
the main valve chamber and the pilot valve chamber are connected via a gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body;
The main valve body is arranged around the pilot valve port and has a projection projecting in the sliding direction of the main valve body and a connection passage connecting the inside and the outside of the projection. An electrically driven valve characterized by: a valve body having a main valve chamber and a pilot valve chamber; a main valve body that separates the main valve chamber from the pilot valve chamber and opens and closes a main valve port connected to the main valve chamber; and a pilot valve body that opens and closes a pilot valve port that connects the pilot valve chamber,
The outer peripheral surface of the main valve body is slidably in contact with the inner peripheral surface of the valve body,
the main valve body has an annular convex portion that protrudes in the sliding direction in the pilot valve chamber,
in a valve closed state in which the main valve port is closed, the tip of the projection is separated from the inner surface of the pilot valve chamber,
In the valve open state in which the main valve port is open, the tip of the convex portion contacts the inner surface of the pilot valve chamber, and the pilot valve chamber has a central space inside the convex portion and an annular peripheral space outside the convex portion. and the peripheral space is connected to the gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body,
An electrically driven valve, wherein the convex portion has a connecting passage connecting the central space and the peripheral space. The main valve body has the pilot valve port,
3. The electrically driven valve according to claim 1, wherein one end of said pilot valve port opens inside said projection. further comprising a piston ring for sealing a gap between the outer peripheral surface of the main valve body and the inner peripheral surface of the valve body;
The electrical system according to any one of claims 1 to 3, wherein the piston ring has a passage connecting a portion of the gap on the main valve chamber side and a portion on the pilot valve chamber side of the gap. drive valve. The electrically driven valve according to any one of claims 1 to 4, wherein the outer peripheral surface of the convex portion is a tapered surface whose diameter decreases toward the tip. The electrically driven valve according to any one of claims 1 to 5, wherein the outer diameter of the convex portion is smaller than the diameter of the outer peripheral surface of the main valve body. 3. The electrical system according to claim 2, wherein the outer peripheral surface of the main valve body or the inner peripheral surface of the valve body has a connection groove that connects the main valve chamber and the peripheral space in the valve open state. drive valve.

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