JP2014156921A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which effectively prevents or suppresses feeling of discomfort to a user due to collision noise generated between components of the solenoid valve.SOLUTION: A solenoid 4 includes: a non-magnetic sleeve 30; a core 32 fixed to the sleeve 30; and a plunger 34 accommodated in the sleeve 30 and disposed in opposition to the core 32 in an axial direction. A valve body includes: a body 5 having an internal passage through which a fluid passes; a main valve seat 18 disposed along the way of the internal passage; and a main valve element 20 displaceable integrally with the plunger 34 according to a driving state of the solenoid 4, and seated on or separated from the main valve seat 18 to open or close the internal passage. A propagation control member 60 is disposed to block or attenuate propagation of collision noise by pressing a part of the sleeve 30 as a propagation path of collision noise when the main valve element 20 is seated on the main valve seat 18, at a position in a plunger 34 side with respect to the core 32.

Description

  The present invention relates to a solenoid valve that controls the flow of fluid.

  An automobile air conditioner is generally configured by arranging a compressor, a condenser, an evaporator, and the like in a refrigerant circulation passage. Various control valves are provided for switching the refrigerant circulation passage and adjusting the refrigerant flow rate according to the operating state of the refrigeration cycle. As such a control valve, an electromagnetic valve that can be electrically opened and closed from the outside is widely employed (see, for example, Patent Document 1).

  Such an electromagnetic valve is configured by assembling a solenoid at an end of a body that accommodates the valve body. The solenoid includes a sleeve fixed to the body, a core fixed to the sleeve, a plunger housed in the sleeve and arranged to face the core, and an electromagnetic coil wound around the sleeve. A return spring is interposed between the plunger and the core. When the solenoid is turned on (energized state), the plunger transmits the solenoid force to the valve body. Accordingly, if the valve is normally open, the valve body is driven in the valve closing direction, and if the valve is normally closed, the valve body is biased in the valve opening direction. When the solenoid is turned off (non-energized), the valve element returns to the original position by the biasing force of the spring.

JP-A-11-287354

  By the way, in such a solenoid valve, a collision sound is generated between components such as a valve body and a plunger every time the solenoid is turned on and off. For this reason, the impact noise has been reduced by taking measures such as providing a cushioning member such as rubber on one collision surface between the colliding parts. However, such measures are not sufficient for vehicles that are required to be quieter, such as hybrid vehicles and electric vehicles, which are becoming increasingly popular in recent years. In addition, in such a configuration, since the buffer member itself deteriorates due to repeated loads due to collision, there is a problem that it is difficult to maintain the sound insulation effect for a long time.

  An object of the present invention is to effectively prevent or suppress a collision sound generated between parts of a solenoid valve from giving a user discomfort.

  In order to solve the above problems, a solenoid valve according to an aspect of the present invention is configured by assembling a valve body and a solenoid. The solenoid includes a non-magnetic sleeve that is fixed to the valve body, a core that is fixed to the sleeve, a plunger that is accommodated in the sleeve and is disposed to face the core in the axial direction, and is wound around the sleeve. And an electromagnetic coil that forms a magnetic circuit with the plunger and the core. The valve body can be integrally displaced with the body having an internal passage for allowing fluid to pass through, the valve seat provided in the middle of the internal passage, and the solenoid according to the driving state of the solenoid, and can be attached to and detached from the valve seat. And a valve body for opening and closing the internal passage. Propagation regulating member for blocking or attenuating the propagation of the collision sound by pressing the sleeve part that becomes the propagation path of the collision sound when the valve body is seated on the valve seat at a position closer to the plunger than the core. Is arranged.

  In this aspect, a propagation restricting member that holds down a specific portion of the sleeve that is a propagation path of the collision sound is disposed. According to this aspect, when the collision sound generated when the valve body is seated on the valve seat propagates between the surrounding rigid bodies, the propagation is blocked or attenuated at the specific portion of the sleeve. Thereby, it is possible to prevent or suppress the collision sound generated inside the electromagnetic valve from leaking to the atmosphere side and causing discomfort to the user. In particular, when the propagation restricting member is pressed against the position of the sleeve on the plunger side with respect to the core, as described below, the effect of blocking the propagation of the collision sound is remarkably exhibited and the effect can be maintained for a long time. It becomes possible.

  In other words, since the sleeve has a smaller cross-sectional width compared to other parts of the solenoid valve, vibrations due to sound waves tend to be large. Can be suppressed. Conversely, since the core has a larger cross section than other parts, there is a possibility of spreading and promoting the propagation of sound, but it takes the form of blocking the propagation at the plunger side in front of it, so this It can be prevented in advance. Further, by providing the propagation restricting member in the portion of the sleeve that is not the collision part, the life of the propagation restricting member is not shortened by the collision, and the propagation cutoff attenuation effect can be maintained for a long time.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent or suppress effectively that the collision sound which arose between the components of a solenoid valve gives a user discomfort.

It is sectional drawing showing the specific structure of the solenoid valve which concerns on 1st Embodiment. It is the A section enlarged view of FIG. It is a fragmentary sectional view showing the propagation regulation structure of a collision sound. It is sectional drawing showing the specific structure of the solenoid valve which concerns on 2nd Embodiment. It is a fragmentary sectional view showing the propagation regulation structure of a collision sound. It is sectional drawing showing the structure of the solenoid valve which concerns on 3rd Embodiment. It is a fragmentary sectional view showing the propagation regulation structure of a collision sound.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed based on the illustrated state.
[First Embodiment]
In this embodiment, the solenoid valve of the present invention is embodied as an on-off valve that is applied to a refrigeration cycle of a hybrid vehicle or an electric vehicle. This refrigeration cycle is configured by connecting in parallel a first refrigerant circulation circuit for air-conditioning the vehicle interior and a second refrigerant circulation circuit for cooling the vehicle-mounted battery. Specifically, a compressor, a condenser, and a receiver are provided in the common refrigerant circulation passage, a first expansion device and an air conditioning evaporator are provided in one of the branched individual refrigerant circulation passages, and a second in the other. An expansion device and a battery cooling evaporator are provided.

  The high-temperature and high-pressure refrigerant compressed by the compressor is sent to the condenser, where it exchanges heat with the air outside the passenger compartment and is condensed. The condensed refrigerant is gas-liquid separated by a receiver, and the liquid refrigerant is sent to at least one of the first expansion device and the second expansion device. The first expansion device squeezes and expands the introduced liquid refrigerant to form a low-temperature and low-pressure gas-liquid two-phase refrigerant and sends it to the air conditioning evaporator. The air conditioning evaporator evaporates the refrigerant sent from the first expansion device by exchanging heat with the air in the passenger compartment, and returns the evaporated gas refrigerant to the compressor. At this time, the first expansion device detects the refrigerant temperature at the outlet of the air conditioning evaporator and controls the flow rate of the refrigerant sent to the air conditioning evaporator so that the refrigerant at the outlet has a predetermined degree of superheat.

  Similarly, the second expansion device squeezes and expands the introduced liquid refrigerant to form a low-temperature / low-pressure gas-liquid mixed refrigerant and sends it to the battery cooling evaporator. The battery cooling evaporator evaporates the refrigerant sent from the second expansion device by exchanging heat with the battery, and returns the evaporated gas refrigerant to the compressor. At this time, the second expansion device detects the refrigerant temperature at the outlet of the battery cooling evaporator and controls the flow rate of the refrigerant sent to the battery cooling evaporator so that the refrigerant at the outlet has a predetermined degree of superheat. .

  Each expansion device is configured as a composite valve in which an expansion valve (not shown) (temperature-type expansion valve) and a shutoff valve that allows or blocks the flow of the refrigerant on the downstream side of the valve portion of the expansion valve are assembled. The solenoid valve of this embodiment functions as the shutoff valve. That is, the solenoid valve of this embodiment is provided in each of the first expansion device and the second expansion device. When operating only the air conditioner, the solenoid valve of the first expansion device is opened and the solenoid valve of the second expansion device is closed. Conversely, when only the battery cooling device is to function, the electromagnetic valve of the first expansion device is closed and the electromagnetic valve of the second expansion device is opened.

  Next, a specific configuration of the electromagnetic valve of the present embodiment will be described. The solenoid valve of this embodiment is configured as a so-called pilot-actuated normally closed valve. FIG. 1 is a cross-sectional view illustrating a specific configuration of the electromagnetic valve according to the first embodiment. The electromagnetic valve 1 is configured by assembling a valve body 2 and a solenoid 4. The electromagnetic valve 1 includes a body 5 shared with a corresponding expansion valve. The solenoid 4 is assembled so as to seal the upper end opening of the body 5.

  A valve chamber 10 is defined between the body 5 and the solenoid 4. The valve chamber 10 connects the upstream introduction passage 12 and the downstream outlet passage 14. In addition, the introduction channel | path 12 is provided in the back of the cross section of illustration (refer the broken line). The lead-out passage 14 communicates with the valve chamber 10 through the main valve hole 16. A main valve seat 18 is formed at the upstream opening end of the main valve hole 16. In the valve chamber 10, a stepped columnar main valve body 20 is disposed. When the main valve body 20 is attached to and detached from the main valve seat 18, the main valve is opened and closed. Further, a stepped cylindrical guide portion 22 is extended from the solenoid 4 side toward the valve chamber 10, and the main valve body 20 is inserted into the guide portion 22. The guide part 22 is connected to the body 5 via an O-ring 23 for sealing.

  The main valve body 20 and the guide portion 22 are disposed coaxially (on the same axis) as the main valve hole 16. The main valve body 20 defines a back pressure chamber 24 between the guide portion 22 and the main valve body 20. The outer surface of the main valve body 20 is slidably supported on the inner peripheral surface of the guide portion 22 and operates stably in the axial direction (opening / closing direction of the main valve). A small-diameter pilot valve hole 26 penetrating the center of the main valve body 20 in the axial direction is provided. Between the lower end portion of the guide portion 22 and the main valve body 20, a spring 28 (functioning as an “urging member”) that biases the main valve body 20 in the valve opening direction is interposed.

  On the other hand, the solenoid 4 includes a non-magnetic sleeve 30, a core 32 fixed so as to seal the upper end opening of the sleeve 30, a plunger 34 disposed opposite to the core 32 in the sleeve 30, the sleeve 30, and It includes a bobbin 36 that is externally fitted to the core 32 and an electromagnetic coil 38 that is wound around the bobbin 36. The plunger 34 is disposed between the core 32 and the main valve body 20. A pair of end members 40 are provided so as to sandwich the electromagnetic coil 38 vertically. The end member 40 also functions as a yoke that constitutes a magnetic circuit. A current-carrying harness 42 is drawn out from the end member 40. The solenoid 4 is connected to the body 5 via a seal ring 44.

  The sleeve 30 has a stepped cylindrical shape, and the lower half of the sleeve 30 is enlarged in diameter and is connected to the guide portion 22. The core 32 has a stepped columnar shape, and the lower end of the core 32 is fitted to the upper end of the sleeve 30 to seal the upper end opening of the sleeve 30. The plunger 34 has a bottomed cylindrical shape, and is provided with a communication passage 46 that communicates with the inside and outside of the side portion. The space between the plunger 34 and the core 32 communicates with the back pressure chamber 24 via the communication passage 46 and a communication groove (not shown) formed on the outer peripheral surface of the plunger 34.

  A thin pilot valve body 50 is integrally provided at the lower end central portion of the plunger 34. The pilot valve body 50 has a tapered shape in which the lower portion is reduced in diameter toward the lower side. The pilot valve body 50 extends to the back pressure chamber 24 and contacts and separates from the pilot valve hole 26 to open and close the pilot valve. A spring receiver 52 made of an elastic body (for example, rubber) is provided at the center of the lower surface of the core 32, and a spring 54 that biases the pilot valve body 50 in the valve closing direction between the spring receiver 52 and the plunger 34. (Acting as a “biasing member”) is interposed. In the present embodiment, the spring 54 is set to have a larger spring load than the spring 28.

  A propagation restricting member 60 is provided so as to press the side surface of the sleeve 30 inward in the radial direction. The propagation regulating member 60 is a member for blocking or attenuating the propagation of the collision sound generated when the main valve is opened and closed to the atmosphere side at the position of the sleeve 30, and is made of an elastic body (rubber in the present embodiment). The propagation restricting member 60 has a ring shape and is fitted to the outer peripheral surface of the sleeve 30 with a predetermined fastening allowance. The details of the collision sound propagation regulation structure will be described later.

  FIG. 2 is an enlarged view of part A in FIG. (A) shows the closed state of the main valve, and (B) shows the opened state of the main valve. As shown in FIG. 2 (A), the main valve body 20 has a valve member 64 made of a cylindrical elastic body (for example, polytetrafluoroethylene (PTFE) or rubber) fixed to the inside of a cylindrical main body 62. The main valve is opened and closed when the valve member 64 is attached to and detached from the main valve seat 18. The pilot valve hole 26 penetrates along the axis of the valve member 64. A pilot valve seat 66 is formed at the end of the pilot valve hole 26 on the back pressure chamber 24 side.

  A small-diameter orifice 68 (functioning as a “leak passage”) that communicates the inside and outside of the back pressure chamber 24 is formed near the periphery of the main body 62. Further, a shielding wall 70 that extends outward in the radial direction in a flange shape is provided at the lower end of the main body 62. A concave portion 72 is provided between the sliding portion of the main valve body 20 with the guide portion 22 and the shielding wall 70. The recess 72 forms a gap S with the sliding surface of the guide portion 22 when the main valve shown in FIG. The shielding wall 70 and the recess 72 prevent or suppress foreign matter in the refrigerant from biting into the sliding portion between the main valve body 20 and the guide portion 22.

  That is, even when a foreign matter such as metal powder contained in the refrigerant wraps around the shielding wall 70 and adheres to the recess 72 when the main valve shown in FIG. It is possible to prevent or suppress a situation in which the foreign matter is contained in the gap S in the process of relative displacement with respect to 22 and the foreign matter bites into both sliding portions. That is, the main valve body 20 on the movable side is provided with a recess 72, and even if the main valve body 20 is pulled inward of the guide portion 22 by the valve opening operation, the attached foreign matter is difficult to contact the sliding surface. It is said. As a result, it is possible to prevent or suppress the malfunction of the valve portion due to the biting of foreign matter.

  On the other hand, the propagation restricting member 60 is assembled so as to be sandwiched between the bobbin 36 and the lower end member 40 as shown in the figure. The propagation restricting member 60 has a tapered shape with a small width toward the inner peripheral surface thereof, and is configured to be able to apply a local pressing force to the side surface of the sleeve 30. With such a configuration, even if vibration is transmitted from the guide portion 22 to the sleeve 30, it can be damped.

  Returning to FIG. 1, in the solenoid valve 1 configured as described above, no attractive force acts between the core 32 and the plunger 34 when the solenoid 4 is off (non-energized state). Therefore, the pilot valve body 50 is urged by the urging force of the spring 54, and the pilot valve body 50 is seated on the pilot valve seat 66 and the pilot valve is closed as shown in FIG. At this time, since the refrigerant in the introduction passage 12 is introduced into the back pressure chamber 24 through the orifice 68, a differential pressure in the valve closing direction acts on the main valve body 20. As a result, the main valve maintains a closed state.

  On the other hand, when the solenoid 4 is turned on (energized state), a suction force acts between the core 32 and the plunger 34. Therefore, as shown in FIG. And the pilot valve opens. As a result, the refrigerant in the back pressure chamber 24 is led out to the lead-out passage 14 through the pilot valve hole 26, and the pressure in the back pressure chamber 24 decreases. Here, since the passage section of the orifice 68 is smaller than the passage section of the pilot valve hole 26, a differential pressure in the valve opening direction temporarily acts on the main valve body 20. The main valve body 20 is pushed up by the force of the differential pressure and the biasing force of the spring 28, and the main valve is quickly opened. At this time, the gas-liquid two-phase refrigerant introduced from the upstream expansion valve (not shown) through the introduction passage 12 is led out to the lead-out passage 14 through the valve chamber 10 and the main valve hole 16, and then to the downstream evaporator. Supplied.

  Next, a structure for restricting the propagation of collision sound in the electromagnetic valve of the present embodiment will be described. FIG. 3 is a partial cross-sectional view showing a propagation restriction structure for collision sound. (A) shows the state immediately after the solenoid 4 is turned on, and (B) shows the state immediately after the solenoid 4 is turned off. The arrows in the figure indicate the propagation state of the collision sound.

  As shown in FIG. 3A, when the solenoid 4 is turned on from off, the plunger 34 is pulled up by the suction force and collides with the core 32 (see B part). However, since the spring receiver 52 functions as a buffer member and the rigid portions of the plunger 34 and the core 32 do not collide with each other, generation of the collision sound is suppressed. Further, since the spring receiver 52 is made of an elastic body, even if a collision sound is generated, the propagation is attenuated.

  Further, since the urging force that urges the main valve body 20 downward by the plunger 34 is released, the main valve body 20 is pushed up by the spring 28, and the shielding wall 70 collides with the guide portion 22 (see C portion). This collision sound is transmitted from the guide portion 22 to the sleeve 30, but is blocked or attenuated at the position of the propagation restricting member 60. For this reason, in any case, the collision sound is cut off or attenuated in the propagation path to be cut off, and is prevented from propagating to the atmosphere side, that is, outward of the upper end member 40.

  On the other hand, as shown in FIG. 3B, when the solenoid 4 is turned from on to off, the attraction force disappears, so that the plunger 34 is pushed down by the urging force of the spring 54 and the pilot valve body 50 is moved to the pilot valve seat. 66 (see part D). Thereafter, the main valve body 20 is seated on the main valve seat 18 (see section E). At this time, a collision sound is generated due to the closing of the pilot valve and the main valve, but the propagation is attenuated as shown.

  That is, these collision sounds are transmitted to the spring 54 via the plunger 34 on the one hand, but the propagation is blocked or attenuated by the spring receiver 52. In addition, these collision sounds are transmitted to the sleeve 30 via the main valve body 20 and the guide portion 22 on the other hand, but are blocked or attenuated at the position of the propagation restricting member 60. For this reason, in any case, the collision sound is cut off or attenuated in the propagation path to be cut off, and is prevented from propagating to the atmosphere side, that is, outward of the upper end member 40.

  As described above, according to the present embodiment, at least the valve body 2 is formed between the collision part that generates a collision sound when the valve part is opened and closed and the exposed part exposed to the atmosphere in the solenoid 4. A propagation regulating member 60 is provided for blocking or attenuating the propagation of the collision sound by applying an elastic force in a direction crossing the sound propagation path to one sound propagation path. That is, a propagation restricting member 60 that presses the sleeve 30 serving as a propagation path of the collision sound generated around the valve portion is provided. For this reason, the propagation of the collision sound generated immediately after the valve closing or immediately after the valve opening is blocked or attenuated at the position of the sleeve 30. In particular, since the propagation restricting member 60 is disposed on the plunger 34 side of the sleeve 30, propagation to the core 32 is restricted, so that it is possible to effectively prevent the collision sound from leaking into the atmosphere. Further, since the sound vibration is attenuated at the position of the sleeve 30 where the sound propagation path is narrowed, the attenuation effect is relatively increased. Furthermore, by providing the propagation restricting member 60 in the portion of the sleeve 30 that is not the collision portion, the propagation cutoff attenuation effect can be maintained for a long time.

[Second Embodiment]
The solenoid valve of the present embodiment is different from the first embodiment in that it is a normally closed valve. For this reason, below, it demonstrates centering on difference with 1st Embodiment. FIG. 4 is a cross-sectional view illustrating a specific configuration of the electromagnetic valve according to the second embodiment. In the figure, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals.

  The electromagnetic valve 201 is configured by assembling the valve body 2 and a solenoid 204. In the solenoid 204, the sleeve 230 has a bottomed cylindrical shape, and the vicinity of the bottom portion penetrates the end member 40 and is exposed to the atmosphere. A core 232 is provided integrally with the guide portion 22. The plunger 234 is disposed on the opposite side of the core 232 from the main valve body 20, that is, on the bottom side of the sleeve 230.

  The core 232 has a stepped cylindrical shape, and the lower half of the core 232 has an enlarged diameter and is connected to the guide portion 22. The plunger 234 has a stepped cylindrical shape and forms a back pressure chamber 224 on the side opposite to the core 232. The back pressure chamber 224 includes a communication passage 46 provided on the side of the plunger 234, a communication groove (not shown) formed on the outer peripheral surface of the plunger 234, a space between the core 232 and the plunger 234, and the core 232. And a back pressure chamber 24 through a clearance between the operation rod 240 and the operation rod 240 (functioning as an “operation connection portion”, which will be described later).

  An operating rod 240 is coaxially inserted inside the core 232 and the plunger 234. The operating rod 240 has a locking portion 242 that is slightly enlarged in diameter at the upper end portion, and the lower end portion is a pilot valve body 50 having a tapered shape. The pilot valve body 50 extends through the core 232 to the back pressure chamber 24. A buffer member 250 made of an elastic body (for example, rubber) is provided at the bottom of the sleeve 230. A spring 254 (which functions as an “urging member”) for biasing the pilot valve body 50 in the valve closing direction is interposed between the buffer member 250 and the locking portion 242. The spring receiver 52 is provided at the lower end of the plunger 234. A spring 54 is interposed between the spring receiver 52 and the core 232. In the present embodiment, the spring 54 is set to have a larger spring load than the spring 254.

  With such a configuration, the pilot valve body 50 basically operates integrally with the plunger 234. However, when the pilot valve body 50 is seated on the pilot valve seat 66, the pilot valve body 50 can be displaced relative to the plunger 234. As a result, when the solenoid 204 is turned on, the suction force does not directly act on the pilot valve body 50, that is, the pilot valve can be closed only by the urging force of the spring 254. Etc.) and collision noise can be suppressed. Further, by providing the buffer member 250, it is possible to suppress a collision sound when the plunger 234 collides with the sleeve 230 when the solenoid 204 is turned off.

  A propagation restricting member 260 is provided so as to press the side surface of the sleeve 230 inward in the radial direction. The propagation restricting member 260 is assembled so as to be sandwiched between the bobbin 36 and the upper end member 40 as illustrated. The propagation restricting member 260 has a ring shape and is made of an elastic body (rubber in the present embodiment) that is fitted to the outer peripheral surface of the sleeve 30 with a predetermined tightening allowance. The propagation restricting member 260 has a cross section that is convex inward in the radial direction, and is configured to be able to apply a local pressing force to the side surface of the sleeve 230. With such a configuration, even if vibration is transmitted from the guide portion 22 to the sleeve 230, it can be damped. The propagation restricting member 260 blocks or attenuates the propagation of the collision sound generated when the main valve is opened and closed to the atmosphere at the position of the sleeve 230.

  In the solenoid valve 201 configured as described above, when the solenoid 204 is turned on (energized state), a suction force acts between the core 232 and the plunger 234, so that the operating rod 240 is biased by the spring 254. Accordingly, the pilot valve body 50 is seated on the pilot valve seat 66 and the pilot valve is closed. At this time, since the refrigerant in the valve chamber 10 is introduced into the back pressure chamber 24 through the orifice 68, a large differential pressure in the valve closing direction acts on the main valve body 20, and the main valve body 20 resists the biasing force of the spring 28. Close the valve. In the state where the solenoid 204 is kept on, both the main valve and the pilot valve are kept closed, so that the pressure in the back pressure chamber 24 is maintained. As a result, the closed state of the main valve is also maintained stably.

  On the other hand, when the solenoid 204 is turned from on to off (non-energized state), the suction force between the core 232 and the plunger 234 is lost, so the pilot valve body 50 is lifted and separated from the pilot valve seat 66, and the pilot The valve is opened. As a result, the refrigerant in the back pressure chamber 24 is led to the downstream side through the pilot valve hole 26, and the pressure in the back pressure chamber 24 decreases. Since the passage section of the orifice 68 is smaller than the passage section of the pilot valve hole 26, a differential pressure in the valve opening direction temporarily acts on the main valve body 20. The main valve body 20 is pushed up by the force of the differential pressure and the biasing force of the spring 28, and the main valve is quickly opened.

  Next, a structure for restricting the propagation of collision sound in the electromagnetic valve of the present embodiment will be described. FIG. 5 is a partial cross-sectional view showing a collision sound propagation regulation structure. (A) shows a state immediately after the solenoid 204 is turned on, and (B) shows a state immediately after the solenoid 204 is turned off. The arrows in the figure indicate the propagation state of the collision sound.

  As shown in FIG. 5A, when the solenoid 204 is turned on from off, the plunger 234 is pulled down by the suction force and collides with the core 232 (see B part). However, since the spring receiver 52 functions as a buffer member, the occurrence of the collision sound is suppressed. Even if a collision sound is generated, the propagation is attenuated.

  Further, since the urging force for urging the operating rod 240 upward by the plunger 234 is released, the operating rod 240 is pushed down by the spring 254, and the pilot valve body 50 is seated on the pilot valve seat 66 (see D section). Thereafter, the main valve body 20 is seated on the main valve seat 18 (see section E). At this time, a collision sound is generated due to the closing of the pilot valve and the main valve, but the propagation is attenuated as shown.

  That is, these collision sounds are transmitted to the spring 254 via the operating rod 240 on the one hand, but the propagation is blocked or attenuated by the buffer member 250. Further, these collision sounds are transmitted to the sleeve 230 via the main valve body 20 and the guide portion 22 on the other hand, but are blocked or attenuated at the position of the propagation restricting member 260. For this reason, in any case, the collision sound is cut off or attenuated in the propagation path to be cut off, and is prevented from propagating to the atmosphere side, that is, outward of the upper end member 40.

  On the other hand, as shown in FIG. 5B, when the solenoid 204 is turned from on to off, the suction force is lost, so that the plunger 234 is pushed up by the biasing force of the spring 54 and the plunger 234 collides with the buffer member 250. (Refer to part F). However, since the rigid portions of the plunger 234 and the sleeve 230 do not collide with each other, the generation of the collision noise is suppressed. Further, since the buffer member 250 is made of an elastic body, even if a collision sound is generated, the propagation is attenuated. Further, since the pilot valve body 50 is pulled up, the main valve body 20 is pushed up by the urging force of the spring 28, and the shielding wall 70 collides with the guide portion 22 (see section C). This collision sound is transmitted from the guide portion 22 to the sleeve 230, but is blocked or attenuated at the position of the propagation restricting member 260.

[Third Embodiment]
The electromagnetic valve of the present embodiment is slightly different from the second embodiment in the structure for restricting the propagation of collision sound. For this reason, below, it demonstrates centering on difference with 2nd Embodiment. In the figure, the same components as those in the second embodiment are denoted by the same reference numerals. FIG. 6 is a cross-sectional view illustrating a configuration of an electromagnetic valve according to the third embodiment.

  The electromagnetic valve 301 is configured by assembling the valve body 2 and a solenoid 304. In the present embodiment, a propagation regulating member 350 is provided at the bottom center of the sleeve 230. A spring 254 is interposed between the propagation regulating member 350 and the operating rod 240. On the other hand, an annular buffer member 352 is fitted to the upper end portion of the plunger 334. The buffer member 352 is made of an elastic body (rubber in the present embodiment), and suppresses a collision sound when the plunger 334 collides with the sleeve 230 when the solenoid 304 is turned off. That is, in this embodiment, the buffer member 250 of the second embodiment is divided, and one of them is disposed on the sleeve 230 as the propagation restricting member 350 and the other is disposed on the plunger 334 as the buffer member 352. In the modification, the buffer member 352 may be disposed on the sleeve 230 separately from the propagation restricting member 350.

  Further, the propagation restricting member 360 of the present embodiment is composed of an O-ring, and is fitted to the outer peripheral surface of the sleeve 230 with a predetermined tightening allowance. However, unlike an O-ring that is exclusively used for sealing, a tightening allowance (press-fit allowance) that allows the sleeve 230 to be elastically tightened from the outside is set. The propagation regulating member 360 blocks or attenuates the propagation of the collision sound generated when the main valve is opened and closed to the atmosphere side at the position of the sleeve 230.

  Next, a structure for restricting the propagation of collision sound in the electromagnetic valve of the present embodiment will be described. FIG. 7 is a partial cross-sectional view showing a propagation restriction structure for collision sound. (A) shows a state immediately after the solenoid 304 is turned on, and (B) shows a state immediately after the solenoid 304 is turned off. The arrows in the figure indicate the propagation state of the collision sound.

  As shown in FIG. 7A, when the solenoid 304 is turned on from the off state, the plunger 334 is pulled down by the suction force and collides with the core 232 (see part B). However, as in the second embodiment, the spring receiver 52 functions as a buffer member, so that the occurrence of collision noise is suppressed. Even if a collision sound is generated, the propagation is attenuated.

  Further, since the urging force for urging the operating rod 240 upward by the plunger 334 is released, the operating rod 240 is pushed down by the spring 254, and the pilot valve body 50 is seated on the pilot valve seat 66 (see D section). Thereafter, the main valve body 20 is seated on the main valve seat 18 (see section E). At this time, a collision sound is generated due to the closing of the pilot valve and the main valve, but the propagation is attenuated as shown.

  That is, these collision sounds are transmitted to the spring 254 via the operating rod 240 on the one hand, but the propagation is blocked or attenuated by the propagation restricting member 350. Further, these collision sounds are transmitted to the sleeve 230 via the main valve body 20 and the guide portion 22 on the other hand, but are blocked or attenuated at the position of the propagation restricting member 360. For this reason, in any case, the collision sound is cut off or attenuated in the propagation path to be cut off, and is prevented from propagating to the atmosphere side, that is, outward of the end member 40.

  On the other hand, as shown in FIG. 7B, when the solenoid 304 is turned from on to off, the suction force is lost, so the plunger 334 is pushed up by the urging force of the spring 54, and the buffer member 352 of the plunger 334 is moved to the sleeve. It collides with the bottom of 230 (see part F). However, since the rigid portions of the plunger 334 and the sleeve 230 do not collide with each other, the generation of the collision noise is suppressed. Further, since the buffer member 352 is made of an elastic body, even if a collision sound is generated, the propagation is attenuated. Further, since the pilot valve body 50 is pulled up, the main valve body 20 is pushed up by the urging force of the spring 28, and the shielding wall 70 collides with the guide portion 22 (see section C). This collision sound is transmitted from the guide portion 22 to the sleeve 230, but is blocked or attenuated at the position of the propagation restricting member 360.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  In the above-described embodiment, the configuration in which the propagation restriction members 60, 260, and 360 are provided outside the sleeves 30 and 230 has been described. In a modification, the propagation restricting member may be provided inside the sleeve, and an elastic pressing force may be applied to the sleeve outward in the radial direction. In that case, the propagation restricting member 60 is arranged at a position where it does not buffer with the plunger.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

  DESCRIPTION OF SYMBOLS 1 Solenoid valve, 2 Valve body, 4 Solenoid, 5 Body, 10 Valve chamber, 18 Main valve seat, 20 Main valve body, 22 Guide part, 28 Spring, 30 Sleeve, 32 Core, 34 Plunger, 40 End member, 50 Pilot Valve body, 54 spring, 60 propagation regulating member, 66 pilot valve seat, 70 shielding wall, 201 solenoid valve, 204 solenoid, 230 sleeve, 232 core, 234 plunger, 240 actuating rod, 250 buffer member, 254 spring, 260 propagation regulation Member, 301 solenoid valve, 304 solenoid, 334 plunger, 350 propagation restriction member, 352 buffer member, 360 propagation restriction member.

Claims (6)

In a solenoid valve constructed by assembling a valve body and a solenoid,
The solenoid is
A non-magnetic sleeve fixed to the valve body;
A core fixed to the sleeve;
A plunger accommodated in the sleeve and disposed opposite to the core in the axial direction;
An electromagnetic coil wound around the sleeve to form a magnetic circuit with the plunger and the core;
Including
The valve body is
A body having an internal passage for the passage of fluid;
A valve seat provided in the middle of the internal passage;
A valve body that is integrally displaceable with the plunger according to a driving state of the solenoid, and that opens and closes the internal passage by being attached to and detached from the valve seat;
Including
When the valve body is seated on the valve seat, the portion of the sleeve that becomes a propagation path of the collision sound is pressed at a position closer to the plunger side than the core, thereby blocking or attenuating the propagation of the collision sound. An electromagnetic valve characterized in that a propagation restricting member is provided.   The electromagnetic valve according to claim 1, wherein the propagation restricting member is an elastic member that urges the outer peripheral surface of the sleeve inward in the radial direction.   The shock absorbing member for attenuating a collision sound while arrange | positioning between the said core and the said plunger while mitigating the impact when both collide is arrange | positioned. solenoid valve. A spring for biasing the plunger in a direction away from the core is interposed between the core and the plunger,
The electromagnetic valve according to claim 3, wherein the buffer member serves as a receiving surface of the spring and functions as a second propagation regulating member for blocking or attenuating sound propagation through the spring. The plunger is disposed on the opposite side of the core from the valve body;
An operation coupling part for connecting the valve body and the plunger so as to be integrally displaceable,
The actuating connection portion is provided so as to penetrate the core;
5. A second buffering member is disposed between the bottom of the sleeve and the plunger to mitigate an impact when the two collide with each other and attenuate a collision sound. The solenoid valve described in 1. Between the bottom of the sleeve and the operation connecting portion, a second spring for biasing the operation connecting portion in the direction of approaching the valve body is interposed,
6. A third propagation regulating member for blocking or attenuating sound propagation through the second spring is provided on a receiving surface of the second spring in the sleeve. The solenoid valve described in 1.

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