KR100337534B1 - Reduced Noise Solenoid Valve - Google Patents

Abstract

PURPOSE: A low-noise solenoid valve is provided to suppress the noise of an electronic solenoid valve by absorbing the noise due to the shock of a plunger in two or three stages. CONSTITUTION: A valve body(14) having a fluid inlet(14a) and a fluid outlet(14b) has a seat member fixing part(17) on the inner bottom face. A seat member(16) fixed on the seat member fixing part has a path in the center. A plunger(15) having a steel ball(18) for opening the path of the seat member moved upward and downward depending on the excited state of a solenoid coil(11). An elastic spring(19) installed on the outer face of the seat member absorbs noise when the plunger moves downward. An another elastic spring(20) formed at an upper portion of the plunger secondly absorbs shock when the plunger moves upward.

Description

Low Noise Solenoid Valve

The present invention relates to a low noise type solenoid valve that can be suitably employed in a fluid control system. More specifically, the present invention relates to a fluid control system of an air conditioner, a refrigerating device, or a refrigerating device. It relates to a low noise solenoid valve designed to suppress the maximum force.

As is well known, a general fluid control system including a refrigerant supply system of a vehicle fuel supply system, an air conditioner, a refrigerating device or a refrigerating device has an electronic control scheme for circulating a path of a fluid (for example, fuel or refrigerant) (i.e., Electronic solenoid valves are widely employed as a means for turning the flow path ON / OFF.

According to such a solenoid valve, the current applied to the solenoid coil wound around the core is controlled in an ON / OFF manner to have a structure that opens and closes the circulation path of the fluid according to the excited state of the solenoid coil.

Here, when the flow path is controlled by controlling the current flowing through the solenoid coil in an ON / OFF manner, the flow path opening and closing member (eg, an amateur or plunger) moves up and down while the solenoid coil is excited and moves. Bar noise is generated when the flow path opening and closing member moves up and down to open and close the flow path. Therefore, for example, when the solenoid valve of such a structure is used in an air conditioner, a refrigerating machine or a freezer, an impact sound is generated every time the solenoid valve is started, causing acoustic discomfort, and for this reason, a low noise design for the solenoid valve Is required.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a low noise type solenoid valve capable of lowering noise by suppressing impact noise generated when an action for opening and closing a fluid circulation path is performed. have.

In order to achieve the above object, according to the first embodiment of the present invention, in the solenoid valve which is opened and closed in accordance with the excitation state of the solenoid coil wound on the core member and covered by the case, the fluid communicating with the flow path A valve body having an inlet pipe and a fluid outlet pipe in a piercing direction, and having a seat tapered at the inner bottom thereof with a curved taper; A seat member having a lower hemispherical shape seated on the seat member seating portion and a central portion of the seat member penetrating therethrough; A plunger provided at a lower side thereof with a steel ball for opening and closing a flow path of the seat member and moving up and down within the valve body according to an excited state of the solenoid coil; First noise buffering means installed on an outer circumference of the sheet member to mitigate noise when the plunger is lowered; A low noise solenoid valve is provided, which is housed in a spring receiving groove formed on the upper side of the plunger and includes a second noise buffer means for mitigating an impact when the plunger is raised.

According to the first embodiment, a hydraulic discharge hole is formed to horizontally penetrate the spring receiving groove of the plunger.

Further, a rubber packing as a third sound absorbing means is further provided between the case and the core member.

According to a second embodiment of the present invention, a solenoid valve wound up and closed by a core member to open and close a flow path in accordance with an ON / OFF current of a solenoid coil covered by a case, the fluid inlet pipe communicating with the flow path; A valve main body having a fluid outlet pipe fixed thereto, and having an inner end surface thereof having a curved end portion formed therein with a steel ball seat; A plunger seated on the steel ball seating portion, a steel ball for opening and closing the flow path is installed at a lower side, and lifting and lowering to open and close the flow path; First noise buffering means housed in the lower inner surface of the plunger to mitigate the impact noise caused by the steel ball when the plunger is lowered; Second noise buffering means housed above the plunger to mitigate impact noise during the upward movement of the plunger; Third noise buffering means coupled to a shading coil defining a suction direction with respect to the plunger and positioned between the lower core member positioned above the plunger and the core member to mitigate impact noise when the plunger is raised; A low noise solenoid valve provided with a fourth sound absorbing means provided between the case and the core member is provided.

According to the second embodiment of the present invention, the first sound absorbing means is an elastic spring which is accommodated in a spring storing groove formed at the lower side of the plunger to cushion the impact of the steel ball, and the second sound absorbing means. Is an elastic spring housed in a spring storage groove formed on the upper side of the plunger, and the third noise absorbing means is constituted by a wave washer.

Preferably, according to the present invention, a hydraulic pressure hole is formed in the horizontal direction in the spring receiving groove formed on the upper side of the plunger.

Therefore, according to the first embodiment of the present invention, when the plunger rises when the solenoid coil is excited, the elastic spring as the second noise buffering means buffers the noise noise between the plunger and the core member, At the time of the lowering, the impact noise generated between the steel ball and the seat member provided on the lower side of the plunger by the elastic spring as the first noise buffer means provided on the outer circumference of the seat member is alleviated.

In addition, according to the second embodiment of the present invention, when the plunger is raised as the current is applied to the solenoid coil, the impact noise is remarkably buffered by the second to fourth noise buffering means, and when the plunger is lowered, In the first noise buffer means, the impact noise generated between the steel ball and the steel ball seating portion formed on the bottom of the valve body is alleviated.

1 is a cross-sectional view showing the structure of a low noise solenoid valve according to a first embodiment of the present invention;

2 is a cross-sectional view of a low noise type solenoid valve according to a second embodiment of the present invention;

Figure 3 is an exploded perspective view of the low noise solenoid valve according to the present invention shown in FIG.

* Description of the symbols for the main parts of the drawings *

10: core member, 11: solenoid coil,

14: valve body, 15: plunger,

16: sheet member, 19: elastic spring (first noise absorbing means),

20: elastic spring (second noise absorbing means),

22: rubber packing, 30: core member,

31: solenoid coil, 34: valve body,

35: plunger, 37: steel ball,

39: elastic spring, 40: wave washer,

42: lower core member, 44: elastic spring,

46: Rubber packing.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 is a cross-sectional view for explaining the structure of a low noise solenoid valve according to a first embodiment of the present invention.

In the same figure, reference numeral 10 denotes a core member constituting a corresponding solenoid valve, and a solenoid coil 11 that is excited by an externally applied current is wound around the core member 10. Here, the solenoid coil 11 is covered by a metal cover member 12, for example, the core member 10 wound around the solenoid coil 11 is screwed to the upper side of the cover member 12 (13) is firmly coupled to the inside of the cover member 12.

In addition, the lower side of the core member 10 is coupled to the valve body 14 having a hollow shape inside, the inside of the valve body 14 is elevated in accordance with the excitation state of the solenoid coil 11 The plunger 15, which acts to open and close the flow path by movement, is stored in a non-fixed manner.

And, the lower side of the plunger 15 of the fluid inlet pipe 14a extending in the horizontal direction of the valve body 14 and the fluid outlet pipe 14b extending in the cross direction with respect to the fluid inlet pipe 14a. A bronze sheet member 16 is provided, the center of which penetrates through a predetermined diameter so that the flow path a communicates therebetween.

The seat member 16 has a diameter in which the upper side thereof has a diameter close to the inner wall of the valve body 14, and the lower side thereof is formed in a hemispherical shape, and the valve body 14 in which the fluid outlet pipe 14b extends. The front end of the flow path (a) is formed at the lower portion of the sheet member 16 is bent tapered with a curvature corresponding to the hemispherical lower portion of the sheet member 16 to seat the seat member seating portion ( 17).

In addition, at the lower end of the plunger 15, a steel ball 18 for opening and closing the flow path a formed in the center of the sheet member 16 is provided to be rotatable, and the sheet member 16 is rotated. In the periphery of the), an elastic spring 19 is provided which acts as a first noise buffer means for reducing the noise when the plunger 15 is lowered.

In addition, a spring storage groove 15a having a predetermined depth is formed in the center of the upper surface of the plunger 15, and the spring storage groove 15a has a bottom surface of the core member 10 when the plunger 15 is lifted. The elastic spring 20 which acts as a second noise buffer means for mitigating the impact noise when the plunger 15 is in contact with is received.

Preferably, a constant interval (eg, 0.3 mm to 0.5 mm) is maintained between the upper side of the plunger 15 and the bottom face of the core member 10 to define the lifting stroke of the plunger 15.

In addition, the hydraulic discharge hole 21 for discharging the hydraulic pressure is formed by horizontally penetrating the side wall of the spring receiving groove 15a of the plunger 15, the hydraulic discharge hole 21 is the solenoid coil ( When the plunger 15 rises according to the excitation of 11), the plunger 15 is not disturbed by the pressure of the fluid introduced into the upper side through the gap with the valve body 14 and the formation of an oil film. It has a function to distribute the hydraulic pressure.

In addition, the fluid inlet pipe 14a and the fluid outlet pipe 14b are fixed to the valve body 14 by, for example, silver brazing.

In addition, an annular shading coil 23 is accommodated in a lower side of the core member 10, and the shading coil 23 is formed when an alternating current is applied to the solenoid coil 11. Irrespective of the polarity change of the alternating current, the suction force of the solenoid coil 11 always has a function of being formed in a constant direction.

In addition, according to the present invention, when the core member 10 is fixed to the cover member 12 by a screw 13, an annular third noise is formed between the cover member 12 and the core member 10. When the rubber packing 22 as a cushioning means is additionally arranged, it is possible to further mitigate impact noise during the upward movement of the plunger 15.

Therefore, according to the solenoid valve according to the first embodiment of the present invention having the above structure, when the current is not applied to the solenoid coil 11 wound on the core member 10, the plunger 15 is lower As it is held in position, the flow path a penetrating the sheet member 16 is blocked by the steel balls 18, thereby allowing fluid between the fluid inlet pipe 14a and the fluid outlet pipe 14b. Will not flow.

On the other hand, when a current is applied to the solenoid coil 11, the solenoid coil 11 is excited to cause the plunger 15 to move up, and the plunger 15 is formed of the fluid acting on the upper side thereof. In the state where the hydraulic pressure is discharged through the hydraulic discharge hole 21, the suction is quickly increased. Here, during the upward movement of the plunger 15, the noise is alleviated as the shock to the core member 10 is buffered by the elastic spring 20 as the second noise buffer means stored above. When the rubber packing 22 is employed, the shock is additionally cushioned to further reduce noise.

When the plunger 15 is moved up by the excitation of the solenoid coil 11, the flow path a in the seat member 16 blocked by the steel ball 18 is opened and the fluid inlet pipe 14a is opened. The fluid introduced into the valve body 14 is discharged to the fluid outlet pipe 14b through the flow path a in the seat member 16.

When the current applied to the solenoid coil 11 is cut off, the plunger 15 is lowered by the repulsive force of the elastic spring 20, and the steel ball 18 when the plunger 15 is lowered. Makes instantaneous impact contact with the sheet member 16, but the impact upon such contact is cushioned by the elastic spring 19 as a first noise buffer means provided around the lower side of the seat member 16, Noise generated when the plunger 15 is lowered is also suppressed as much as possible.

Therefore, according to the low noise solenoid valve according to the first embodiment of the present invention, the noise generated when the plunger 15 moves up and down to open and close the flow path according to the excited state of the solenoid coil 11 is multi-stage. The damping structure is suppressed to the maximum, and accordingly, when the corresponding solenoid valve is employed in the fluid circulation cycle of, for example, an air conditioner, a refrigerator or a freezer, a low noise design is possible.

2 is a cross-sectional view of a low noise solenoid valve according to a second exemplary embodiment of the present invention, and FIG. 3 is an exploded perspective view of the low noise solenoid valve according to the present invention shown in FIG. 2.

2 and 3, the solenoid coil 31 is wound around the outer circumference of the core member 30, which is excited by an externally applied current. Here, the solenoid coil 31 is covered by a metal cover member 32, for example, the core member 30 is the cover member by a screw 33 is fastened to the upper side of the cover member 32 It is fixedly coupled inside the 32.

In addition, the core member 30 is coupled to the valve body 34 having a hollow shape inside thereof, and the upper and lower sides of the valve body 34 are elevated in accordance with the excited state of the solenoid coil 31. The moving plunger 35 is stored in an unfixed manner.

Further, at the lower end of the plunger 35, between the fluid inlet pipe 34a extending in the horizontal direction of the valve body 14 and the fluid outflow pipe 34b extending in the vertical direction of the valve body 14. Steel balls 37 for opening and closing the flow path 36 to be formed are coupled, and the steel balls 37 have a first noise contained in the first spring storage groove 38 formed below the plunger 35. An elastic spring 39 is provided as a cushioning means.

In addition, a second noise buffer for alleviating the impact noise generated during the upward movement of the plunger 35 between the lower side of the core member 30 and the upper side of the plunger 35 in the valve body 34. The lower core member 42 in which the wave washer 40 as a means and the annular shading coil 41 are received so that a suction force is always generated in a constant direction irrespective of the polarity change of the current flowing through the solenoid coil 31. Is interposed.

In addition, in the second spring receiving groove 43 formed on the upper side of the plunger 35, the plunger 35 for reducing the noise caused by the collision with the lower core member 42 when the plunger 35 is raised. An elastic spring 44 as a third noise absorbing means is stored.

Here, the plunger 35 is spaced apart with the lifting stroke minimized with respect to the lower core member 42 (eg, 0.3 mm to 0.5 mm).

In addition, a hydraulic discharge hole 45 is formed through the second spring receiving groove 43 of the plunger 35 in a lateral direction, and the hydraulic discharge hole 45 is formed in the excitation of the solenoid coil 31. Accordingly, when the plunger 35 is raised, the hydraulic pressure is excluded to prevent the plunger 35 from being hindered from being lifted by the formation of an oil film and the pressure of the fluid flowing upward through the gap with the valve body 34. It will have a function to distribute the discharge.

In addition, a rubber packing 46 is further interposed between the case 32 and the core member 30 as a fourth noise buffering means for cushioning the impact sound.

In addition, the steel ball seating portion 47 which protrudes slightly to the inner bottom surface of the valve body 34 to form the flow path 36 is similar to the seat member seating portion 17 shown in FIG. It is more preferable if the curved taper is processed with a curvature corresponding to the circumference.

Therefore, according to the solenoid valve according to the second embodiment of the present invention having the above-described structure, when no current is applied to the solenoid coil 31, the steel ball 37 located below the plunger 35 is The flow path 36 formed between the fluid outflow pipe 34b from the fluid inflow pipe 34a that is pressurized downward by the elastic spring 39 and fixedly coupled to the valve body 34 is blocked.

On the other hand, when alternating AC current is applied to the solenoid coil 31, the annular shading coil 41 housed in the lower core member 42 always raises the constant direction, that is, the plunger 35. The suction force is generated in the direction to be made to raise the plunger 35 upwards, the plunger 35 is a rapid state in which the hydraulic pressure of the fluid acting on the upper side is discharged through the hydraulic discharge hole 45 Suction is increased.

The impact sound that may be generated when the plunger 35 is raised is primarily alleviated by the elastic spring 44 as the second noise buffering means, and the wave washer 40 and the fourth noise buffering as the third noise buffering means. It is suppressed to a minimum by the rubber packing 46 as a means.

When the plunger 35 is raised by the above process, as the flow path 36 blocked by the steel ball 37 is opened, the fluid introduced from the fluid inlet pipe 34a flows through the flow path 36. It flows through the outflow pipe 34b.

On the contrary, when the current applied to the solenoid coil 31 is removed, the plunger 35 is lowered by the repulsive force of the elastic spring 44, and the steel ball 37 is lowered when the plunger 35 is lowered. The possibility of colliding with the lower inner surface of the valve body 34 forming the flow path 36 is assumed, and when the lowering of the plunger 35, the steel ball 37 is a steel ball seating portion 47 of the valve body 34. ), The impact in the case of blocking the flow path 36 is alleviated by the elastic spring 39 serving as the first noise damping means provided at the rear of the steel ball 37, when the plunger 35 is lowered. The noise generated is also extremely suppressed.

Therefore, according to the solenoid valve according to the second embodiment of the present invention, the noise generated when the plunger 35 moves up and down in accordance with the excited state of the solenoid coil 31 is suppressed as much as possible. When the solenoid valve is employed in, for example, the fluid circulation path of the air conditioning, refrigeration and refrigeration equipment, a low noise design is possible.

On the other hand, the present invention is not limited to the first and second embodiments described above, of course, various changes and modifications can be made within the scope not departing from the technical gist and gist of the invention.

As described above, according to the low-noise solenoid valve according to the present invention, the noise of the electronic solenoid valve is extremely suppressed by cushioning the noise caused by the impact of the plunger which is lifted up and down during opening and closing of the flow passage for two or three times. It becomes possible.

Claims (7)

In the solenoid valve which the flow path is opened and closed in accordance with the excitation state of the solenoid coil wound on the core member and covered by the case, A valve body having a fluid inlet pipe and a fluid outlet pipe communicating with the flow passage in a cross direction and having an inner tapered tapered seat member on its inner bottom defining the flow passage; A sheet member having a lower hemispherical portion seated on the seat member seating portion and a central portion formed therethrough; Plungers are provided at the lower side for opening and closing the flow path of the seat member and the lifting and lowering movement in the valve body according to the excitation state of the solenoid coil, A first noise buffering means installed on an outer circumference of the sheet member to mitigate noise when the plunger is lowered; A second noise absorbing means, which is accommodated in a spring storing groove formed on an upper side of the plunger to mitigate an impact when the plunger is raised; A low noise solenoid valve comprising a rubber packing as a third noise damping means provided between the case and the core member. The low noise solenoid valve according to claim 1, wherein a hydraulic discharge hole is formed to horizontally penetrate the spring storage groove of the plunger. delete A solenoid valve configured to open and close a flow path in accordance with an ON / OFF current of a solenoid coil wound around a core member and covered by a case, A valve body in which a fluid inlet pipe and a fluid outlet pipe communicating with the flow path are coupled, and a front end defining the flow path is curved as a steel ball seat; A plunger seated on the steel ball seating portion, a steel ball for opening and closing the flow path is installed at a lower side, and lifting and lowering to open and close the flow path; A first noise buffering means housed in the lower inner surface of the plunger to mitigate the impact noise caused by the steel ball when the plunger is lowered; A second noise absorbing means stored in an upper side of the plunger to mitigate impact noise during the upward movement of the plunger; Third noise buffering means coupled to the shading coil defining a suction direction with respect to the plunger and positioned between the lower core member positioned above the plunger and the core member to mitigate impact noise when the plunger is raised; , Low noise type solenoid valve, characterized in that provided with a fourth noise absorbing means installed between the case and the core member. 5. The low noise type solenoid valve according to claim 4, wherein the first noise absorbing means is an elastic spring which is accommodated in a spring storing groove formed at a lower side of the plunger to cushion the impact of the steel ball. 5. The low noise solenoid valve according to claim 4, wherein the second sound absorbing means is an elastic spring housed in a spring storing groove formed on the upper side of the plunger, and a hydraulic discharge hole is formed in the horizontal direction of the spring storing groove. . 5. The low noise solenoid valve according to claim 4, wherein the third noise absorbing means is a wave washer.