CN219997982U - Electrically actuated valve - Google Patents

Abstract

Provided is an electrically driven valve capable of effectively suppressing the impact sound of a plunger without a performance change. The solenoid valve (1) is provided with a synthetic resin buffer member (50) that can be elastically deformed in an inner space (33 b) of the plunger (33). When the plunger (33) is separated from the upper end wall portion (32 b) of the housing (32), the upper end (50 a) of the cushioning member (50) protrudes from the inner space (33 b) toward the upper end wall portion (32 b). Then, when the plunger (33) moves toward the upper end wall portion (32 b), the upper end (50 a) of the cushioning member (50) is brought into contact with the upper end wall portion (32 b) and pushed into the inner space (33 b), and the plunger (33) is brought into contact with the upper end wall portion (32 b).

Description

Electrically actuated valve

Technical Field

The present utility model relates to an electrically actuated valve.

Background

Patent document 1 discloses a pilot-operated solenoid valve as an example of a conventional electrically driven valve. The solenoid valve of patent document 1 has a valve body and a main spool. The valve body has an inflow port, an outflow port, and a housing space for housing the main valve element. The accommodating space is divided into an upper part and a lower part by the main valve core. The lower part of the accommodating space is a main valve chamber. The upper part of the accommodating space is a pilot valve chamber. The inflow port is connected to the main valve chamber. The main valve chamber is connected to the outflow port via a main valve seat. The main valve element moves in the up-down direction to open and close the main valve seat. The main valve core is provided with a pilot valve port, a pilot valve seat and a pressure equalizing passage. The pilot valve port penetrates the main valve element in the up-down direction. The pilot valve seat is configured to surround an upper end of the pilot valve port. The pressure equalizing passage connects the main valve chamber and the pilot valve chamber.

The solenoid valve of patent document 1 has a pilot valve element. The pilot spool is fixed to a cylindrical plunger. The plunger is disposed inside the tube so as to be movable in the up-down direction. A fixed core is disposed below the plunger. A valve opening spring is arranged between the plunger and the fixed iron core. The valve opening spring presses the plunger upward. An electromagnetic coil is disposed outside the tube.

When the electromagnetic coil is energized, the plunger and the fixed core are magnetized, and the plunger moves downward together with the pilot spool. The pilot valve body closes the pilot valve seat and presses the main valve body downward. Then, the main valve spool moves downward to close the main valve seat, and the solenoid valve is in a closed state.

When the energization of the solenoid is stopped, the plunger moves upward together with the pilot valve element by the valve opening spring, and the pilot valve seat opens. The main valve spool moves upward due to the pressure difference between the main valve chamber and the pilot valve chamber, and the main valve seat is opened, so that the solenoid valve is in an open state.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2019-7572

Technical problem to be solved by the utility model

In the above electromagnetic valve, the plunger and the tube are made of metal. When the energization of the electromagnetic coil is stopped, the plunger moves upward and abuts against the upper end wall portion of the tube. Therefore, a collision sound of the plunger with the tube may be generated. In order to suppress such a collision sound, a structure in which a synthetic resin buffer member is disposed between the plunger and the tube can be employed in the solenoid valve. However, the cushioning member may be deteriorated or deformed due to the influence of the refrigerant, oil, etc. flowing through the solenoid valve. As a result, the position of the pilot valve element (the lift amount from the pilot valve seat) in the open valve state may vary. Therefore, there is a concern that the performance of the solenoid valve may change.

Disclosure of Invention

Accordingly, an object of the present utility model is to provide an electrically driven valve capable of effectively suppressing the impact sound of a plunger without a performance change.

Technical means for solving the technical problems

In order to achieve the above object, an electrically driven valve according to an embodiment of the present utility model includes: the plunger is provided with a movement restricting portion which restricts movement of the plunger by contact with the plunger, when one of the plunger and the movement restricting portion is a first component and the other is a second component, a housing portion is provided with a buffer member made of synthetic resin which is elastically deformable, when the plunger is separated from the movement restricting portion, a part of the buffer member protrudes from the housing portion toward the second component, and when the plunger is moved toward the movement restricting portion, a part of the buffer member contacts with the second component and is pushed into the housing portion, and the plunger contacts with the movement restricting portion.

According to the present utility model, when one of the plunger and the movement restricting portion is a first component and the other is a second component, the housing portion is provided in the first component. A synthetic resin buffer member is disposed in the housing portion. When the plunger is separated from the movement restricting portion, a part of the buffer member protrudes from the housing portion toward the second component. Then, when the plunger moves toward the movement restricting portion, a part of the buffer member contacts the second constituent element and is pushed into the housing portion, and the plunger contacts the movement restricting portion. In this way, when the plunger moves toward the movement restricting portion, the buffer member disposed in the housing portion of one (the first component) of the plunger and the movement restricting portion contacts the other (the second component), and then the plunger contacts the movement restricting portion. This reduces the moving speed of the plunger by the buffer member before the plunger contacts the movement restricting portion. Further, since the plunger contacts the movement restricting portion after the buffer member is pushed into the housing portion, the position of the plunger and the valve element in the valve-open state can be prevented from being changed. Therefore, the electrically driven valve of the present utility model effectively suppresses the impact sound of the plunger without performance change.

In the present utility model, it is preferable that the buffer member has a cylindrical shape with both ends open, and one end of the buffer member protrudes from the housing portion toward the second component. In this way, the buffer member can be prevented from adhering to the second component. Therefore, the movement of the plunger can be suppressed from being obstructed.

In the present utility model, it is preferable that a groove is provided in a surface of the buffer member that contacts the second component. In this way, the buffer member can be prevented from adhering to the second component. Therefore, the movement of the plunger can be suppressed from being obstructed.

In the present utility model, it is preferable that the plunger is the first component, the movement restricting portion is the second component, the plunger has a cylindrical shape with one end opened, and an inner space of the plunger is the housing portion. In this way, it is not necessary to separately form a hole or the like serving as a housing portion, and the manufacturing cost can be reduced.

In the present utility model, it is preferable that the housing has a peripheral wall portion and an end wall portion that blocks one end of the peripheral wall portion, and the movement restricting portion is the end wall portion. In this way, the movement restricting portion can be provided in a relatively simple structure.

In the present utility model, it is preferable that a fixed iron core is disposed at one end of the housing, and the movement restricting portion is the fixed iron core. In this way, the movement restricting portion can be provided in a relatively simple structure.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present utility model, the impact sound of the plunger can be effectively suppressed without performance change.

Drawings

Fig. 1 is a cross-sectional view (valve-closed state) of a solenoid valve according to a first embodiment of the utility model.

Fig. 2 is a cross-sectional view (intermediate state) of the solenoid valve of fig. 1.

Fig. 3 is an enlarged cross-sectional view of the solenoid valve of fig. 2.

Fig. 4 is an enlarged cross-sectional view showing a state in which a buffer member of the solenoid valve of fig. 3 is pushed into an inner space of a plunger.

Fig. 5 is a sectional view (valve-open state) of the solenoid valve of fig. 1.

Fig. 6 is a sectional view (valve-closed state) of a solenoid valve according to a second embodiment of the utility model.

Fig. 7 is a cross-sectional view (intermediate state) of the solenoid valve of fig. 6.

Fig. 8 is an enlarged cross-sectional view of the solenoid valve of fig. 7.

Fig. 9 is an enlarged cross-sectional view showing a state in which a buffer member of the solenoid valve of fig. 8 is pushed into a receiving portion of a fixed iron core.

Fig. 10 is a sectional view (valve-open state) of the solenoid valve of fig. 6.

Detailed Description

(first embodiment)

Hereinafter, a pilot-operated solenoid valve according to a first embodiment of an electrically driven valve according to the present utility model will be described with reference to fig. 1 to 5.

Fig. 1, 2 and 5 are cross-sectional views of a solenoid valve according to a first embodiment of the present utility model. Fig. 1 shows the solenoid valve in a closed state. Fig. 2 shows the solenoid valve in an intermediate state between the closed state and the open state. Fig. 5 shows the solenoid valve in the open state. Fig. 3 is a cross-sectional view of a part (plunger and its vicinity) of the solenoid valve in the intermediate state shown in fig. 2 enlarged. Fig. 4 is an enlarged cross-sectional view showing a state in which a buffer member of the solenoid valve of fig. 3 is pushed into an inner space of a plunger. In the following description, the term "up, down, left, and right" refers to the relative positional relationship of the constituent elements described in the respective drawings.

As shown in fig. 1 to 5, the solenoid valve 1 of the present embodiment includes a valve body 10, a fixed core 31, a housing 32, a plunger 33 as a movable core, a solenoid 34, a valve shaft 35, a pilot valve element 36, a main valve element 40, and a damper member 50.

The valve body 10 has a substantially rectangular parallelepiped shape. The valve body 10 has an inflow port 11, an outflow port 12, and a main valve chamber 14.

The inflow port 11 opens at the left side surface 10a of the valve body 10. The outflow port 12 opens at the right side surface 10b of the valve body 10. The main valve chamber 14 is disposed between the inflow port 11 and the outflow port 12. A circular main valve seat 16 surrounding the main valve port 15 is provided 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 a main valve seat 16 and a main valve port 15.

The fixed core 31 integrally has a large diameter cylindrical portion 31a and a small diameter cylindrical portion 31b. The large diameter cylindrical portion 31a is fixed to the valve body 10 by a screw structure. The small diameter cylindrical portion 31b is provided continuously with the upper end of the large diameter cylindrical portion 31 a. The small diameter cylindrical portion 31b is arranged to extend upward from the valve body 10.

The housing 32 is made of metal. The housing 32 has a cylindrical shape. The lower end of the housing 32 is open and the upper end is blocked. The housing 32 integrally has a peripheral wall portion 32a and an upper end wall portion 32b. A small-diameter cylindrical portion 31b of the fixed core 31 is inserted into the lower end of the peripheral wall portion 32 a. The housing 32 is engaged with the fixed core 31.

The plunger 33 has a cylindrical shape. The upper end 33a of the plunger 33 is open. The outer diameter of the plunger 33 is slightly smaller than the inner diameter of the housing 32. The plunger 33 is disposed inside the housing 32 so as to be movable in the up-down direction. A valve opening spring 38 for the pilot valve element 36 is disposed between the plunger 33 and the small diameter cylindrical portion 31b of the fixed core 31. The valve opening spring 38 is a compression coil spring. The valve opening spring 38 urges the plunger 33 upward. When the plunger 33 is pushed by the valve opening spring 38 to move upward, the plunger 33 abuts against the upper end wall portion 32b of the housing 32. The upper end wall portion 32b restricts movement of the plunger 33 by contact with the plunger 33. The upper end wall portion 32b is a movement restricting portion. The plunger 33 is a first component, and the upper end wall portion 32b is a second component.

The electromagnetic coil 34 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the housing 32. The housing 32 is inserted inside the electromagnetic coil 34. The electromagnetic coil 34 is disposed outside the housing 32. The electromagnetic coil 34 magnetizes the fixed core 31 and the 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 inserted into the small diameter cylindrical portion 31b of the fixed core 31. The valve shaft 35 is supported by the small-diameter cylindrical portion 31b so as to be movable in the up-down direction. The valve shaft 35 is provided with a fluid passage 35a extending from an upper end to a vicinity of a lower end. The fluid passage 35a is connected to the inner space 33b of the plunger 33.

The pilot spool 36 is integrally provided at the lower end of the valve shaft 35. The pilot spool 36 is connected to the plunger 33 via a valve shaft 35. A disk-shaped spacer 36a is attached to the lower surface of the pilot valve element 36. The spacer 36a is made of synthetic resin.

The main valve body 40 integrally has a trunk portion 41, an upper flange portion 42, and a lower flange portion 43. The trunk 41 has a cylindrical shape. The upper flange portion 42 is provided continuously with the upper portion of the trunk portion 41. The lower flange portion 43 is provided continuously with the lower portion of the trunk portion 41. The trunk portion 41 is provided with a pilot valve port 44 penetrating from the upper end to the lower end. A pilot valve seat 45 surrounding the pilot valve port 44 is provided at the upper end of the trunk portion 41. The upper flange 42 is disposed inside the large-diameter cylindrical portion 31a of the fixed core 31 so as to be slidable in the up-down direction. The upper flange 42 divides the main valve chamber 14 and the pilot valve chamber 37 inside the fixed core 31. The upper flange portion 42 is provided with a pressure equalizing passage 42a that connects the main valve chamber 14 and the pilot valve chamber 37. A gasket 43a having a circular plate shape is attached to the lower surface of the lower flange 43. The pad 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 for the main valve body 40 is disposed between the upper flange portion 42 of the main valve body 40 and the valve body 10. The valve opening spring 39 is a compression coil spring. The valve opening spring 39 urges the main valve body 40 upward.

The cushioning member 50 is made of an elastically deformable synthetic resin. The cushioning member 50 is made of synthetic rubber such as ethylene propylene diene rubber (EPDM) or Hydrogenated Nitrile Butadiene Rubber (HNBR). The buffer member 50 has a cylindrical shape with both ends open. The outer diameter of the cushioning member 50 is the same as the inner diameter of the plunger 33. The buffer member 50 is inserted into the inner space 33b of the plunger 33. The inner space 33b of the plunger 33 is a housing portion for housing the cushioning material 50. When the buffer member 50 is not externally biased, the upper end 50a, which is a part of the buffer member 50, protrudes upward from the inner space 33b. The lower end of the buffer member 50 contacts the upper end of the inwardly facing tapered surface 33c located inside the plunger 33. The buffer member 50 preferably has a cylindrical shape having a relatively large axial length. For example, the axial length of the buffer member 50 is preferably about 2 to 5 times the outer diameter thereof. In this way, the deformation rate of the cushioning member 50 in the valve-opened state can be reduced, and the deterioration of the resilience of the cushioning member 50 due to long-term use can be suppressed. The buffer member 50 may be a coil spring made of synthetic resin, or the like. The synthetic resin constituting the coil spring is, for example, a plastic such as Polyamide (PA), an engineering plastic such as Polyacetal (POM), or a super engineering plastic such as polyphenylene sulfide (PPS) or polyether ether ketone (PEEK).

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

Fig. 1 shows the solenoid valve 1 in a closed state. In the solenoid valve 1 in the closed state, the electromagnetic coil 34 is energized, and the plunger 33 is magnetically pulled toward the fixed iron core 31. The pilot spool 36 (specifically, the pad 36 a) is in contact with the pilot valve seat 45, and the pilot valve seat 45 is closed. The main valve element 40, specifically the gasket 43a, contacts the main valve seat 16, and the main valve seat 16 closes. In the valve-closed state, the flow of the refrigerant from the main valve chamber 14 and the pilot valve chamber 37 to the outflow port 12 is shut off, and the refrigerant flowing from the inflow port 11 stays in the main valve chamber 14 and the pilot valve chamber 37.

When the energization of the solenoid 34 is stopped, the plunger 33 is pressed by the valve opening spring 38 and moves upward. Then, as shown in fig. 2 and 3, the upper end 50a of the cushioning member 50 is brought into contact with the upper end wall portion 32b of the housing 32, and thereafter, as shown in fig. 4, the cushioning member 50 is elastically deformed such that the upper end 50a is pushed into the inner space 33b of the plunger 33, and the upper end 33a of the plunger 33 is brought into contact with the upper end wall portion 32b.

As shown in fig. 5, the pilot valve element 36 moves away from the pilot valve seat 45 with upward movement of the plunger 33, and the pilot valve seat 45 opens. The refrigerant in the pilot valve chamber 37 flows to the outflow port 12 through the pilot valve seat 45 and the pilot valve port 44, and the force of pressing the main valve body 40 against the main valve seat 16 by the refrigerant is reduced. The main valve body 40 is pushed upward by the valve opening spring 39, the main valve body 40 is separated from the main valve seat 16, and the main valve seat 16 is opened. Thereby, the solenoid valve 1 is in the open state, and the refrigerant in the main valve chamber 14 flows to the outflow port 12 through the main valve seat 16 and the main valve port 15.

Then, when the electromagnetic coil 34 is energized again, the plunger 33 is magnetically pulled toward the fixed core 31, and the pilot valve element 36 moves downward. Then, the pilot valve body 36 contacts the pilot valve seat 45 to push the main valve body 40 downward, and the main valve body 40 contacts the main valve seat 16. The pilot spool 36 closes the pilot valve seat 45 and the main spool 40 closes the main valve seat 16. Thereby, the solenoid valve 1 is again in the closed state, and the flow of the refrigerant from the main valve chamber 14 and the pilot valve chamber 37 to the outflow port 12 is shut off. Elastic deformation of the cushioning member 50 is eliminated and the shape of the cushioning member 50 is restored.

As described above, the solenoid valve 1 has: a cylindrical case 32; a plunger 33 disposed inside the housing 32; an electromagnetic coil 34 disposed outside the housing 32; and a pilot valve element 36 connected to the plunger 33 via a valve shaft 35. The housing 32 is provided with an upper end wall portion 32b, and the upper end wall portion 32b is in contact with the plunger 33 to restrict movement of the plunger 33. A synthetic resin cushioning member 50 that is elastically deformable is disposed in the inner space 33b of the plunger 33. When the plunger 33 is separated from the upper end wall portion 32b, the upper end 50a of the cushioning member 50 protrudes from the inner space 33b toward the upper end wall portion 32b. Then, when the plunger 33 moves toward the upper end wall portion 32b, the upper end 50a of the cushioning member 50 contacts the upper end wall portion 32b and is pushed into the inner space 33b, and the plunger 33 contacts the upper end wall portion 32b.

As a result, when the plunger 33 moves toward the upper end wall portion 32b, the cushioning member 50 disposed in the inner space 33b of the plunger 33 contacts the upper end wall portion 32b, and thereafter, the plunger 33 contacts the upper end wall portion 32b. Thereby, the moving speed of the plunger 33 can be reduced by the buffer member 50 before the plunger 33 contacts the upper end wall portion 32b. Further, since the plunger 33 contacts the upper end wall portion 32b after the buffer member 50 is pushed into the inner space 33b, the positions of the plunger 33 and the pilot spool 36 in the valve-open state can be prevented from being changed. Therefore, the solenoid valve 1 can effectively suppress the collision sound of the plunger 33 without performance change.

The buffer member 50 has a cylindrical shape with both ends open. The upper end 50a of the cushioning member 50 protrudes from the inner space 33b of the plunger 33 toward the upper end wall portion 32b. In this way, the cushion member 50 can be prevented from adhering to the upper end wall portion 32b. Therefore, the movement of the plunger 33 can be suppressed from being obstructed.

Further, a groove may be provided in the upper end surface of the buffer member 50. In this way, the buffer member 50 can be further prevented from adhering to the upper end wall portion 32b. Therefore, the movement of the plunger 33 can be suppressed from being obstructed.

In addition, the plunger 33 has a cylindrical shape with an upper end 33a open. The inner space 33b of the plunger 33 is a housing portion for housing the cushioning material 50. In this way, it is not necessary to provide a housing portion for housing the cushioning material 50 separately from the inner space 33b, and the manufacturing cost can be reduced.

The housing 32 includes a peripheral wall portion 32a and an upper end wall portion 32b, and the upper end wall portion 32b is configured to close an upper end of the peripheral wall portion 32 a. The upper end wall portion 32b is a movement restricting portion that restricts movement of the plunger 33. In this way, the movement restricting portion can be provided in a relatively simple structure.

(second embodiment)

Hereinafter, a pilot-operated solenoid valve according to a second embodiment of the electrically driven valve of the present utility model will be described with reference to fig. 6 to 10.

Fig. 6, 7 and 10 are cross-sectional views of a solenoid valve according to a second embodiment of the present utility model. Fig. 6 shows the solenoid valve in the closed state. Fig. 7 shows the solenoid valve in an intermediate state between the closed state and the open state. Fig. 10 shows the solenoid valve in the open state. Fig. 8 is a cross-sectional view of a part (fixed iron core and its vicinity) of the solenoid valve in the intermediate state shown in fig. 7 enlarged. Fig. 9 is an enlarged cross-sectional view showing a state in which a buffer member of the solenoid valve of fig. 8 is pushed into a receiving portion of a fixed iron core.

As shown in fig. 6 to 10, the solenoid valve 2 of the present embodiment includes a valve main body 110, a cylindrical member 130, a fixed core 131, a housing 132, a plunger 133, a solenoid 134, a pilot spool 136, a main spool 140, and a damper member 150.

The valve body 110 has a substantially rectangular parallelepiped shape. The valve body 110 has an inflow port 111, an outflow port 112, and a main valve chamber 114.

The inflow port 111 opens at the left side 110a of the valve main body 110. The outflow port 112 opens at the right side 110b of the valve body 110. The main valve chamber 114 is disposed between the inflow port 111 and the outflow port 112. A circular main valve seat 116 surrounding the main valve port 115 is provided in the main valve chamber 114. The inflow port 111 is connected to the main valve chamber 114. The main valve chamber 114 is connected to the outflow port 112 via a main valve seat 116 and a main valve port 115.

The cylinder member 130 is fixed to the valve body 110 by a screw structure.

The housing 132 is made of metal. The housing 132 has a cylindrical shape with both ends open. The lower end of the housing 132 is inserted into the cylinder member 130. The housing 132 is engaged with the cylinder member 130.

The fixed iron core 131 is inserted into an upper end of the housing 132. The fixed iron core 131 is engaged with the housing 132. The lower end surface 131a of the fixed core 131 has an inwardly tapered shape. A circular receiving hole 131b is provided in the center of the lower end surface 131 a. The buffer member 150 is disposed in the accommodation hole 131b. The accommodation hole 131b is an accommodation portion for accommodating the buffer member 150.

The plunger 133 has a cylindrical shape. The outer diameter of the plunger 133 is slightly smaller than the inner diameter of the housing 132. The plunger 133 is disposed inside the housing 132 so as to be movable in the up-down direction. The upper end face 133a of the plunger 133 has an outwardly tapered shape. A circular valve-closing spring hole 133b is provided in the center of the upper end surface 133 a. A valve closing spring 138 is accommodated in the valve closing spring hole 133b. The valve closing spring 138 is disposed between the plunger 133 and the buffer member 150. The valve closing spring 138 is a compression coil spring. The valve closing spring 138 urges the plunger 133 downward.

The electromagnetic coil 134 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the housing 132. The housing 132 is inserted inside the electromagnetic coil 134. The electromagnetic coil 134 is disposed outside the housing 132. The electromagnetic coil 134 is fixed to the fixed iron core 131 by screws. The electromagnetic coil 134 magnetizes the fixed iron core 131 and the plunger 133. When the fixed core 131 and the plunger 133 are magnetized, the plunger 133 moves upward. When the plunger 133 moves upward, it contacts the fixed core 131. The fixed iron core 131 restricts movement of the plunger 133 by contact with the plunger 133. The fixed iron core 131 is a movement restricting portion. The fixed core 131 is a first component, and the plunger 133 is a second component.

The pilot spool 136 has a conical shape facing downward. The pilot spool 136 is integrally provided at the lower end of the plunger 133. That is, the pilot spool 136 is directly connected to the plunger 133.

Main spool 140 has a frame portion 141 and a cushion portion 142. The frame 141 has a cylindrical shape. The pad portion 142 has a cylindrical shape. The pad portion 142 is fitted to the frame portion 141. The pad portion 142 is provided with a pilot valve port 144 penetrating from the upper end to the lower end. The portion of the pad portion 142 surrounding the upper end of the pilot valve port 144 is a pilot valve seat 145. The main valve body 140 is disposed inside the cylindrical member 130 so as to be slidable in the up-down direction. The main valve body 140 divides the main valve chamber 114 from the pilot valve chamber 137 inside the cylindrical member 130. The main spool 140 is provided with a pressure equalizing passage 140a that connects the main valve chamber 114 and the pilot valve chamber 137. A valve opening spring 139 for the main valve body 140 is disposed between the main valve body 140 and the valve main body 110. The valve opening spring 139 is a compression coil spring. Valve opening spring 139 urges main valve element 140 upward.

The buffer member 150 is made of an elastically deformable synthetic resin. The cushioning member 150 is made of synthetic rubber such as ethylene propylene diene rubber (EPDM) or Hydrogenated Nitrile Butadiene Rubber (HNBR). The buffer member 150 integrally has a buffer portion 151 and a valve-closing spring support portion 152 (hereinafter simply referred to as "support portion 152"). The buffer 151 has a disk shape. The thickness of the buffer 151 when the buffer 151 is not externally biased is greater than the depth of the receiving hole 131b of the fixed core 131. The support portion 152 has a truncated cone shape facing downward. The support portion 152 is continuously provided with the center of the lower surface 151a of the buffer portion 151. The support 152 is inserted into the upper end of the valve closing spring 138. The buffer portion 151 of the buffer member 150 is disposed in the accommodation hole 131b of the fixed core 131. A lower surface 151a of the buffer portion 151, which is a part of the buffer member 150, protrudes downward from the accommodation hole 131b.

Next, an example of the operation of the solenoid valve 2 will be described.

Fig. 6 shows the solenoid valve 2 in a closed state. In the solenoid valve 2 in the closed state, energization of the solenoid 134 is stopped, and the plunger 133 is pressed downward by the valve closing spring 138. The pilot spool 136 is in contact with a pilot valve seat 145, and the pilot valve seat 145 is closed. Main valve element 140 is in contact with main valve seat 116, and main valve seat 116 is closed. In the valve-closed state, the flow of the refrigerant from the main valve chamber 114 and the pilot valve chamber 137 to the outflow port 112 is shut off, and the refrigerant flowing in from the inflow port 111 stays in the main valve chamber 114 and the pilot valve chamber 137.

Then, when the electromagnetic coil 134 is energized, the plunger 133 is pulled toward the fixed iron core 131 by the magnetic force, and moves upward. Then, as shown in fig. 7 and 8, the upper end 133c of the plunger 133 is brought into contact with the lower surface 151a of the buffer portion 151 of the buffer member 150, and thereafter, as shown in fig. 9, the buffer portion 151 is elastically deformed to be pushed into the receiving hole 131b of the fixed core 131, and the upper end surface 133a of the plunger 133 is brought into contact with the lower end surface 131a of the fixed core 131.

As shown in fig. 10, the pilot valve body 136 moves upward with the plunger 133 away from the pilot valve seat 145, and the pilot valve seat 145 opens. The refrigerant in the pilot valve chamber 137 flows to the outflow port 112 through the pilot valve seat 145 and the pilot valve port 144, and the force of pressing the main valve body 140 against the main valve seat 116 by the refrigerant is reduced. The main valve body 140 is pushed upward by the valve opening spring 139, the main valve body 140 is separated from the main valve seat 116, and the main valve seat 116 is opened. Thereby, the solenoid valve 2 is in an open state, and the refrigerant in the main valve chamber 114 flows to the outflow port 112 through the main valve seat 116 and the main valve port 115.

When the energization of the solenoid 134 is stopped again, the plunger 133 is pressed by the valve closing spring 138, and the pilot valve body 136 moves downward. Then, pilot valve element 136 contacts pilot valve seat 145, thereby pressing main valve element 140 downward, and main valve element 140 contacts main valve seat 116. The pilot spool 136 closes the pilot valve seat 145 and the main spool 140 closes the main valve seat 116. Thereby, the solenoid valve is again in the valve-closed state, and the flow of the refrigerant from the main valve chamber 114 and the pilot valve chamber 137 to the outflow port 112 is shut off. Elastic deformation of the buffer 151 is eliminated, and the shape of the buffer 151 is restored.

As described above, the solenoid valve 2 has: a cylindrical case 132; a plunger 133 disposed inside the housing 132; an electromagnetic coil 134 disposed outside the housing 132; and a pilot spool 136 connected to the plunger 133. A fixed iron core 131 is provided in the case 132. The fixed iron core 131 restricts the movement of the plunger 133 by contacting the plunger 133. The fixed iron core 131 is a movement restricting portion. The fixed core 131 is provided with a housing hole 131b. A synthetic resin buffer member 150 that is elastically deformable is disposed in the accommodation hole 131b. When the plunger 133 is separated from the fixed core 131, the lower surface 151a of the buffer portion 151 of the buffer member 150 protrudes from the receiving hole 131b toward the plunger 133. Then, when the plunger 133 moves toward the fixed iron core 131, the lower surface 151a of the buffer 151 contacts the plunger 133 and is pushed into the receiving hole 131b, and the plunger 133 contacts the fixed iron core 131.

As a result, when the plunger 133 moves toward the fixed core 131, the buffer member 150 disposed in the accommodation hole 131b of the fixed core 131 contacts the plunger 133, and thereafter, the plunger 133 contacts the fixed core 131. Thus, the moving speed of the plunger 133 can be reduced by the buffer member 150 before the plunger 133 contacts the fixed core 131. Further, since the plunger 133 is in contact with the fixed core 131 after the buffer member 150 is pushed into the accommodation hole 131b, the positions of the plunger 133 and the pilot valve element 136 in the valve-open state can be prevented from being changed. Therefore, the electromagnetic valve 2 can effectively suppress the collision sound of the plunger 133 without performance change.

Further, a fixed iron core 131 is disposed at an upper end of the case 132. The fixed core 131 is a movement restricting portion that restricts movement of the plunger 133. In this way, the movement restricting portion can be provided in a relatively simple structure.

The embodiments of the present utility model have been described above, but the present utility model is not limited to these examples. Those skilled in the art can appropriately add, remove, and design change the constituent elements of the above embodiments, or appropriately combine the features of the embodiments, and the present utility model is included in the scope of the present utility model as long as the gist of the present utility model is not violated.

Symbol description

(first embodiment)

1 solenoid valve, 10 valve main body, 10a left side face, 10b right side face, 11 inflow port, 12 outflow port, 14 main valve chamber, 15 main valve port, 16 main valve seat, 31 fixed core, 31a large diameter cylindrical portion, 31b small diameter cylindrical portion, 32 housing, 32a peripheral wall portion, 32b upper end wall portion, 33 plunger, 33a upper end, 33b inner space, 33c conical surface, 34 solenoid, 35 valve shaft, 35a fluid passage, 36 pilot valve core, 36a packing, 37 pilot valve chamber, 38, 39 valve opening spring, 40 main valve core, 41 body portion, 42 upper flange portion, 42a equalizing passage, 43 lower flange portion, 43a packing, 44 pilot valve port, 45 pilot valve seat, 50 buffer member, 50a upper end

(second embodiment)

2 … solenoid valve, 110 … valve body, 110a … left side face, 110b … right side face, 111 … inlet port, 112 … outlet port, 114 … main valve chamber, 115 … main valve port, 116 … main valve seat, 130 … cylindrical member, 131 … fixed core, 131a … lower end face, 131b … receiving hole, 132 … housing, 133 … plunger, 133a … upper end face, 133b … valve closing spring hole, 133c … upper end, 134 … solenoid, 136 … pilot valve core, 137 … pilot valve chamber, 138 … valve closing spring, 139 … valve opening spring, 140 … main valve core, 140a … equalizing passage, 141 … frame portion, 142 … cushion portion, 144 … pilot valve port, 145 … pilot valve seat, 150 … cushioning member, 151 … cushioning portion, 151a … lower surface, 152 … valve closing spring support portion.

Claims (1)

1. An electrically driven valve, the electrically driven valve having: a cylinder-shaped housing, a plunger disposed inside the housing, an electromagnetic coil disposed outside the housing, and a valve element connected to the plunger,

the housing has a peripheral wall portion and an end wall portion that blocks one end of the peripheral wall portion,

the end wall portion restricts movement of the plunger by contact with the plunger,

the plunger has a cylindrical shape with one end open,

a buffer member made of synthetic resin and capable of elastic deformation is arranged in the inner space of the plunger,

the buffer member has a cylindrical shape with one end and the other end opened,

when the plunger is separated from the end wall portion, one end of the buffer member protrudes from the inner space of the plunger toward the end wall portion,

when the plunger moves toward the end wall portion, one end of the cushioning member is in contact with the end wall portion and pushed into an inner space of the plunger, the plunger is in contact with the end wall portion,

only the peripheral edge of the other end of the buffer member is in contact with an inward tapered surface which is located inside the plunger and becomes smaller in diameter as it leaves the one end of the plunger,

the other end surface of the buffer member is disposed at a distance from the tapered surface.