Exhaust and noise reduction type electromagnetic valve

Abstract

The utility model belongs to the technical field of electromagnetic valves, and particularly discloses an exhaust and noise reduction type electromagnetic valve which comprises a plastic seat and a coil, the coil is sleeved outside the plastic seat, one end of the plastic seat is hollow and is hermetically inserted with a fixed iron core to form a cavity, and an air inlet hole of the fixed iron core is exposed out of the plastic seat and is communicated with the cavity. The other end of the plastic seat is provided with an air hole and an exhaust channel in a separated mode, the air hole and the exhaust channel are both communicated with the cavity, a silencing hole in an outlet of the exhaust channel is perpendicular to the air hole, silencing cotton is arranged in the silencing hole, and a movable iron core is slidably and elastically connected in the cavity in a clearance fit mode. Two ends of the movable iron core are respectively used for sealing the exhaust channel and the air inlet. According to the electromagnetic valve, the movable iron core slides in the cavity in a clearance mode to control opening and closing of the air inlet hole and the exhaust channel, meanwhile, the silencing cotton is arranged in the silencing hole, noise generated by airflow in the exhaust channel in the exhaust process is eliminated, and the overall performance of the electromagnetic valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solenoid valves, and particularly relates to an exhaust silencing solenoid valve. Background Art

[0002] In an automatic control system and a fluid processing device, a solenoid valve, as a key switching element, is widely used in the on-off control of gases. However, the solenoid valves in the prior art generally have a problem of high noise during the exhaust process. This defect not only affects the quietness of the surrounding environment, but may also cause discomfort to the operators. Even in some application scenarios with strict noise restrictions, it becomes a key factor restricting the use of solenoid valves.

[0003] When the existing solenoid valve exhausts, due to the rapid passage of gas through a narrow exhaust passage and the mechanical collision between the valve core and the valve seat, a large airflow noise and mechanical noise will be generated. As the use time of the solenoid valve extends, due to wear and looseness, the noise problem may be further aggravated, reducing the overall performance of the solenoid valve and making it difficult to meet the urgent market demand for low-noise and high-performance solenoid valves.

[0004] Therefore, the inventor is committed to designing a solenoid valve to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an exhaust silencing solenoid valve, which can reduce noise during the exhaust process, improve the overall performance of the solenoid valve, and meet the urgent market demand for low-noise and high-performance solenoid valves.

[0006] In order to achieve the above purpose, a technical solution adopted by the utility model is as follows:

[0007] An exhaust silencing solenoid valve includes a plastic seat and a coil. The coil is sleeved outside the plastic seat. One end of the plastic seat is hollowed out and hermetically inserted with a fixed iron core to form a cavity. The air inlet hole of the fixed iron core is exposed on the plastic seat and communicated with the cavity. The other end of the plastic seat is provided with an air hole and an exhaust passage at intervals. Both the air hole and the exhaust passage are communicated with the cavity. The silencing hole at the outlet of the exhaust passage is vertically arranged with respect to the air hole. The silencing hole is provided with sound-absorbing cotton. An active iron core is slidably and elastically connected in the cavity in a clearance fit manner. One end of the active iron core is used to seal the exhaust passage, and the other end of the active iron core is used to seal the air inlet hole.

[0008] As an improvement of the exhaust silencing solenoid valve of the utility model, an iron shell is sleeved outside the plastic seat and the fixed iron core. Both the air inlet hole and the air hole are exposed on the iron shell. The sound-absorbing cotton is located outside the iron shell.

[0009] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the silencing platform and the air nozzle of the plastic seat both pass through the iron shell and extend outside the iron shell. The silencing hole is located on the silencing platform, and the air hole is located on the air nozzle.

[0010] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the silencing platform is vertically arranged on the side wall of the air nozzle, and the silencing hole is vertically arranged with the exhaust passage to form an L shape.

[0011] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the coil is exposed outside the iron shell. The iron shell includes a shell body and an iron sheet. The shell body is sleeved on the fixed iron core, and the iron sheet is sleeved on the plastic seat and connected with the shell body to form a frame shape.

[0012] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the shell body is in a U shape and its two ends are respectively provided with notches. The two ends of the iron sheet are respectively provided with positioning protrusions, and the two positioning protrusions are respectively located in the two notches.

[0013] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the fixed iron core is elastically connected with the movable iron core through a spring, and the movable iron core, the coil and the fixed iron core are coaxially arranged.

[0014] As an improvement of the exhaust silencing type solenoid valve of the present utility model, the two end faces of the movable iron core are respectively provided with stop pads. One of the stop pads is used to seal the exhaust passage, and the other stop pad is used to seal the air inlet hole.

[0015] As an improvement of the exhaust silencing type solenoid valve of the present utility model, a convex platform for pressing against the corresponding stop pad is arranged on the end face of the fixed iron core close to the movable iron core, and the air inlet hole is located on the convex platform.

[0016] As an improvement of the exhaust silencing type solenoid valve of the present utility model, a protruding portion for pressing against the corresponding stop pad is arranged on the inner wall of the plastic seat close to the sound-absorbing cotton, and the exhaust passage is located on the protruding portion.

[0017] Compared with the prior art, for the exhaust silencing type solenoid valve of the present utility model, the movable iron core slides in the gap in the cavity formed by the plastic seat and the fixed iron core to control the opening and closing of the air inlet hole and the exhaust passage. At the same time, sound-absorbing cotton is arranged in the silencing hole at the outlet of the exhaust passage to eliminate the noise generated by the airflow in the exhaust passage during the exhaust process, improve the overall performance of the solenoid valve, and meet the urgent needs of the market for low-noise and high-performance solenoid valves. Description of the Drawings

[0018] Figure 1It is a three-dimensional enlarged view of the exhaust silencing type solenoid valve of the present utility model;

[0019] Figure 2 It is a three-dimensional exploded view of the exhaust silencing type solenoid valve of the present utility model;

[0020] Figure 3 It is a sectional enlarged view of the plastic seat of the present utility model;

[0021] Figure 4 It is a sectional enlarged view of the movable iron core and two stop pads of the present utility model;

[0022] Figure 5 It is a three-dimensional enlarged view of the housing and the fixed iron core of the present utility model;

[0023] Figure 6 It is a sectional enlarged view of the fixed iron core of the present utility model;

[0024] Figure 7 It is a sectional enlarged view of the exhaust silencing type solenoid valve of the present utility model in the ventilation state;

[0025] Figure 8 It is Figure 7 The enlarged view of part A in

[0026] Figure 9 It is a sectional enlarged view of the exhaust silencing type solenoid valve of the present utility model in the exhaust state;

[0027] Figure 10 It is Figure 9 The enlarged view of part B in

[0028] Illustration:

[0029] 1. Iron shell; 11. Housing; 111. Notch; 12. Iron sheet; 121. Positioning protrusion; 2. Fixed iron core; 21. Intake hole; 22. Boss; 23. Groove; 3. Plastic seat; 31. Sound-absorbing hole; 311. Exhaust passage; 312. Sound-absorbing platform; 32. Air hole; 321. Air nozzle; 33. Partition; 34. Protruding part; 4. Coil; 5. Movable iron core; 51. Plane; 6. Spring; 61. First stop pad; 62. Second stop pad; 63. Cavity; 7. Sound-absorbing cotton; 8. Sealing ring. Specific implementation mode

[0030] Next, in combination with the attached drawings, the implementation mode of the present utility model will be specifically clarified. The attached drawings are only for reference and illustration, and do not constitute a limitation on the scope of patent protection of the present utility model.

[0031] Refer to Figures 1 to 10, An exhaust silencing solenoid valve, comprising a plastic seat 3, a coil 4, a movable iron core 5, a fixed iron core 2 and a sound-absorbing cotton 7. The coil 4 is sleeved outside the plastic seat 3. One end of the plastic seat 3 is hollowed out. The fixed iron core 2 is hermetically inserted into the hollowed-out part of the plastic seat 3 to form a cavity 63. The air inlet hole 21 of the fixed iron core 2 is exposed on the plastic seat 3 and communicates with the cavity 63. At the other end of the plastic seat 3, an air hole 32 and an exhaust passage 311 are provided at intervals. Both the air hole 32 and the exhaust passage 311 communicate with the cavity 63. The sound-absorbing hole 31 at the outlet of the exhaust passage 311 is vertically arranged with respect to the air hole 32. The sound-absorbing cotton 7 is arranged in the sound-absorbing hole 31. The movable iron core 5 slides in a clearance fit manner and is elastically arranged in the cavity 63. One end of the movable iron core 5 is used to seal the exhaust passage 311, and the other end of the movable iron core 5 is used to seal the air inlet hole 21.

[0032] Refer to Figure 2 and Figure 3 , A circular hole is formed by hollowing out the right end face of the plastic seat 3. Along the axial direction of the left end of the plastic seat 3, an air nozzle 321 is provided. The air hole 32 is coaxially arranged on the air nozzle 321 and communicates with the circular hole of the plastic seat 3. A sound-absorbing platform 312 is vertically provided on the side wall of the air nozzle 321. The sound-absorbing hole 31 is located on the sound-absorbing platform 312. The sound-absorbing hole 31 is located at the outlet of the exhaust passage 311. Specifically, the inlet end of the exhaust passage 311 is butt-connected and communicated with the circular hole of the plastic seat 3. The outlet end of the exhaust passage 311 is located on the side wall of the sound-absorbing hole 31. The sound-absorbing hole 31 is vertically arranged with respect to the exhaust passage 311 to form an L shape. The diameter of the sound-absorbing hole 31 is much larger than the diameter of the exhaust passage 311. The sound-absorbing cotton 7 is cylindrical and filled in the sound-absorbing hole 31. A protruding part 34 is provided on the inner wall of the plastic seat 3 close to the sound-absorbing cotton 7 (i.e., the bottom of the circular hole of the plastic seat 3). The exhaust passage 311 is located on the protruding part 34, making the protruding part 34 annular. Two partitions 33 extend radially outward along the outer wall of the plastic seat 3. The two partitions 33 are arranged at intervals to form an annular groove. The coil 4 is sleeved on the plastic seat 3 and located in the annular groove. Both the air nozzle 321 and the sound-absorbing platform 312 are integrally formed with the plastic seat 3.

[0033] Refer to Figure 2 , Figure 5 and Figure 6 , The fixed iron core 2 is cylindrical. A part of the fixed iron core 2 is inserted into the circular hole of the plastic seat 3 to form the cavity 63. The other part of the fixed iron core 2 extends outside the plastic seat 3. The air inlet hole 21 is arranged along the axial direction of the fixed iron core 2 and passes through the two end faces of the fixed iron core 2. A convex platform 22 is provided on the end face of the fixed iron core 2 close to the movable iron core 5. The air inlet hole 21 is located on the convex platform 22, making the convex platform 22 annular. A circular groove 23 is provided on the side wall of the fixed iron core 2. A sealing ring 8 is provided in the groove 23. The fixed iron core 2 is hermetically connected to the inner wall of the plastic seat 3 through the sealing ring 8.

[0034] Reference Figure 2 and Figure 4 , the movable iron core 5, the coil 4 and the fixed iron core 2 are coaxially arranged. A spring 6 is sleeved on the right end of the movable iron core 5 and the left end of the fixed iron core 2 together, so that the movable iron core 5 can be elastically connected to the fixed iron core 2 through the spring 6. The whole movable iron core 5 is located in the cavity 63. Plane 51 is respectively arranged on two opposite side walls of the movable iron core 5, so that enough gaps can be formed between the movable iron core 5 and the inner wall of the plastic seat 3 to facilitate the flow of air. Stop pads are respectively arranged on both end faces of the movable iron core 5. Both stop pads are made of silica gel or rubber materials. The two stop pads are specifically a first stop pad 61 and a second stop pad 62. The first stop pad 61 is specifically installed in the installation groove on the left end face of the movable iron core 5. The first stop pad 61 is used to press against the protruding part 34 in the plastic seat 3 to seal the exhaust passage 311 and close the exhaust passage 311. The second stop pad 62 is specifically installed in the installation groove on the right end face of the movable iron core 5. The second stop pad 62 is used to press against the boss 22 on the fixed iron core 2 to seal the air inlet hole 21 and close the air inlet hole 21.

[0035] Reference Figure 1 , Figure 2 and Figure 5 , an iron shell 1 is sleeved outside the plastic seat 3 and the fixed iron core 2 together. The iron shell 1 is integrally in a frame shape. The whole coil 4 and the two partition plates 33 are located inside the iron shell 1. The air inlet hole 21, the air hole 32 and the upper and lower sides of the coil 4 are all exposed outside the iron shell 1. The sound-absorbing cotton 7 is located outside the iron shell 1. The iron shell 1 includes a shell body 11 and an iron sheet 12. The shell body 11 is in a U shape and a notch 111 is respectively arranged at both ends of it. The fixed iron core 2 passes through the shell body 11 and is welded to the shell body 11 together. The left end of the fixed iron core 2 is located inside the opening of the shell body 11, and the right end of the fixed iron core 2 extends outside the shell body 11. The iron sheet 12 covers the opening on the side of the shell body 11 and is connected to the shell body 11 to form a frame shape. The iron sheet 12 is sleeved on the plastic seat 3. The sound-absorbing platform 312 and the air nozzle 321 of the plastic seat 3 both pass through the iron sheet 12 and extend outside the iron shell 1. Positioning protrusions 121 are respectively arranged at both ends of the iron sheet 12, and the two positioning protrusions 121 are respectively located in the two notches 111.

[0036] Reference Figures 1 to 10 , the working principle of the exhaust sound-absorbing type solenoid valve of the present utility model is as follows:

[0037] When the coil 4 of the solenoid valve is not powered on, the movable iron core 5 in the cavity 63 slides to the left under the elastic force of the spring 6. The air inlet hole 21 of the fixed iron core 2 is opened. The first stop pad 61 at the left end of the movable iron core 5 presses against the protruding part 34 inside the plastic seat 3 to close the exhaust passage 311. Gas enters the cavity 63 from the air inlet hole 21 of the fixed iron core 2, and then enters the air hole 32 from the gap between the movable iron core 5 and the inner wall of the plastic seat 3, and finally is discharged to the bag body from the air nozzle 321 (such asFigure 7 as shown

[0038] When the coil 4 of the solenoid valve is energized, the coil 4 generates a magnetic field. The magnetic conductors of the movable iron core 5 and the fixed iron core 2 are magnetized by the magnetic field and attract each other with magnetic force. The movable iron core 5 slides to the right along the axis of the plastic seat 3, opening the exhaust passage 311. The spring 6 is compressed until the second stop pad 62 at the right end of the movable iron core 5 presses against the boss 22 on the left end face of the fixed iron core 2. At this time, the air inlet hole 21 is closed, and the gas in the bag enters the cavity 63 through the air hole 32, then enters the muffling hole 31 through the exhaust passage 311, and is discharged outside the bag after noise reduction by the sound-absorbing cotton 7 (as Figure 9 shown

[0039] After the solenoid valve is de-energized, the magnetic field disappears, and the movable iron core 5 resets under the action of the spring 6 and returns to its original position.

[0040] For the exhaust muffling type solenoid valve of the present invention, the movable iron core 5 slides in the gap in the cavity 63 formed by the plastic seat 3 and the fixed iron core 2 to control the opening and closing of the air inlet hole 21 and the exhaust passage 311. At the same time, a sound-absorbing cotton 7 is arranged in the muffling hole 31 at the outlet of the exhaust passage 311 to eliminate the noise generated by the airflow in the exhaust passage 311 during the exhaust process, improve the overall performance of the solenoid valve, and meet the urgent needs of the market for low-noise and high-performance solenoid valves.

[0041] The above-disclosed are only the preferred embodiments of the present invention, and the scope of the patent protection of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. An exhaust silencer type solenoid valve, comprising a plastic seat and a coil, characterized in that: The coil sleeve is arranged outside the plastic seat, one end of the plastic seat is hollowed out and a fixed iron core is sealed and inserted to form a cavity, the air inlet of the fixed iron core is exposed in the plastic seat and is connected with the cavity, the other end of the plastic seat is separated by an air hole and an exhaust channel, the air hole and the exhaust channel are both connected with the cavity, the silencer hole at the outlet of the exhaust channel is perpendicular to the air hole, and silencer cotton is arranged in the silencer hole, and a movable iron core is slidably and elastically connected in the cavity in a clearance fit manner, one end of the movable iron core is used to seal the exhaust channel, and the other end of the movable iron core is used to seal the air inlet hole.

2. The exhaust silencer type solenoid valve according to claim 1, characterized in that: The plastic seat and the fixed iron core are jointly covered with an iron shell, the air inlet and the air hole are both exposed in the iron shell, and the sound-absorbing cotton is located outside the iron shell.

3. The exhaust silencer type solenoid valve according to claim 2, characterized in that: The silencer platform and the air nozzle of the plastic seat both pass through the iron shell and extend outside the iron shell, the silencer hole is located on the silencer platform, and the air hole is located on the air nozzle.

4. The exhaust silencer type solenoid valve according to claim 3, characterized in that: The muffler platform is vertically arranged on the side wall of the air nozzle, and the muffler hole and the exhaust channel are vertically arranged to form an L shape.

5. The exhaust silencer type solenoid valve according to claim 3, characterized in that: The coil is exposed on the iron shell, which includes a shell and an iron sheet. The shell is sleeved on the fixed iron core, and the iron sheet is sleeved on the plastic seat and connected with the shell to form a frame shape.

6. The exhaust silencer type solenoid valve according to claim 5, characterized in that: The shell is in a U-shape and has notches at its two ends. Positioning protrusions are provided at both ends of the iron sheet, and the two positioning protrusions are located in the two notches respectively.

7. The exhaust silencer type solenoid valve according to claim 1, characterized in that: The fixed iron core is elastically connected to the movable iron core through a spring, and the movable iron core, the coil and the fixed iron core are coaxially arranged.

8. The exhaust silencer type solenoid valve according to claim 1, characterized in that: Stop pads are respectively arranged on both end surfaces of the movable iron core, one of the stop pads is used to seal the exhaust passage, and the other stop pad is used to seal the air inlet hole.

9. The exhaust silencer type solenoid valve according to claim 8, characterized in that: A boss for pressing against the corresponding stop pad is provided on the end surface of the fixed iron core close to the movable iron core, and the air inlet is located on the boss.

10. The exhaust silencer type solenoid valve according to claim 8, characterized in that: A protrusion for pressing against the corresponding stop pad is provided on the inner wall of the plastic seat close to the sound-absorbing cotton, and the exhaust channel is located on the protrusion.

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