Pneumatic switch

Abstract

The utility model relates to the technical field of pneumatic switches of air compressors, in particular to a pneumatic switch. A base is arranged at the bottom of the switch body and located on the base, and a cover body is arranged on the base. A diaphragm is arranged between the base and the base, a cavity is formed between the bottom of the diaphragm and the top of the base, and an air source connecting piece penetrating through the base is communicated with the cavity; a teeterboard is arranged in the cover body, a first spring mechanism and a second spring mechanism are arranged on the two sides of a fulcrum plate of the teeterboard respectively, the bottom of a long copper rod of the second spring mechanism is in contact connection with the diaphragm, and the long copper rod is connected with a microswitch through an L-shaped shifting rod. The L-shaped driving lever comprises a driving lever shaft sleeve, a transverse rod and a vertical rod are integrally formed on the driving lever shaft sleeve, and the vertical rod makes contact with the microswitch and rotates relative to the microswitch. According to the utility model, the seesaw, the spring mechanism I and the spring mechanism II form a lever structure, so that the working range of the pressure switch can be accurately adjusted; and a unique L-shaped driving lever structure enables the vertical movement of the spring mechanism II to quickly realize the action switching of the microswitch.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic switch technology for air compressors, specifically a pneumatic switch. Background Technology

[0002] Pressure switches are often used in the operation of air compressors to maintain the gas pressure within a certain range. Existing pressure switches use a control lever to touch a micro switch to start or stop the air compressor. However, the control lever in the existing structure often requires a large displacement to switch the micro switch position, which is not conducive to achieving precise control of the air compressor. Therefore, it is urgent to improve the pressure switch to achieve more precise control of the air compressor. Utility Model Content

[0003] The problem to be solved is to provide a pressure switch for more precise control of air compressors.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic switch, comprising a switch body, a base at the bottom of the switch body, the base being located on a pedestal, and a cover being provided on the base; a diaphragm is provided between the base and the pedestal, and a cavity is formed between the bottom of the diaphragm and the top of the pedestal, and an air source connector penetrating the pedestal communicates with the cavity; a seesaw is provided inside the cover, and a spring mechanism one and a spring mechanism two are respectively provided on both sides of the seesaw's fulcrum plate, the bottom of the long copper rod of the spring mechanism two is in contact with the diaphragm, and the long copper rod is connected to a micro switch through an L-shaped lever; the L-shaped lever includes a lever sleeve, the lever sleeve being integrally formed with a horizontal bar and a vertical bar, the horizontal bar and the vertical bar forming an angle, the vertical bar contacting the micro switch and rotating relative to the micro switch.

[0005] Preferably, the spring mechanism includes a drum-shaped spring, the top of which is connected to an adjusting bolt via a pointer screw plate, and the bottom of which is connected to a copper rod via a cup-shaped washer, the copper rod being connected to the seesaw.

[0006] Preferably, the second spring mechanism includes a second drum-shaped spring. The top of the second drum-shaped spring is connected to an adjusting bolt 2 via a second pointer screw plate. The bottom of the second drum-shaped spring is connected to a long copper rod via a second bowl-shaped washer. The long copper rod includes a first copper rod boss, a second copper rod boss, and a third copper rod boss. The first copper rod boss is located above the diaphragm, and the second copper rod boss is located below the crossbar and abuts against the end of the crossbar.

[0007] Preferably, the micro switch housing is provided with a lever shaft, and the lever sleeve is sleeved on the outside of the lever shaft and rotatably connected to the lever shaft.

[0008] Preferably, the end of the crossbar has a downward protrusion that abuts against the long copper rod; the end of the vertical bar has a vertical protrusion that abuts against the switching point of the micro switch.

[0009] Preferably, the seesaw is further provided with a spring mechanism three, which is located outside the spring mechanism two. The spring mechanism three includes a small spring and an adjusting bolt three located on the small spring.

[0010] Preferably, the seesaw includes a mounting hole one connecting the spring mechanism one and a mounting hole two connecting the spring mechanism two. A fulcrum hole one and a fulcrum hole two are provided between the mounting hole one and the mounting hole two. The fulcrum hole one and the fulcrum hole two are connected to a fulcrum plate. Arc-shaped protrusions extend from both sides of the mounting hole two, and the arc-shaped protrusions form line contact with the copper rod boss three.

[0011] Compared with the prior art, this utility model provides a pneumatic switch with the following advantages: This utility model achieves precise adjustment of the working range of the pressure switch by forming a lever structure through a seesaw, spring mechanism one, and spring mechanism two, and its adjustment accuracy is better than that of a switch with a single spring structure; the unique L-shaped lever structure enables the vertical movement of spring mechanism two to quickly realize the switching action of the micro switch. The pressure switch of this utility model is suitable for air compressor equipment with high precision requirements. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the external structure of the present utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the cover of this utility model;

[0014] Figure 3 This is a schematic diagram of the seesaw structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the L-shaped lever structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the L-shaped lever installation of this utility model;

[0017] Figure 6 This is a cross-sectional schematic diagram of the spring mechanism involved in this utility model from both sides;

[0018] Explanation of reference numerals in the attached drawings: 1. Switch body; 11. Base; 12. Base; 111. Sealing ring; 112. Annular gasket; 113. Spacer; 114. Large steel sheet; 13. Cover; 14. Terminal block; 15. Air source connector; 2. Diaphragm; 21. Cavity; 3. Seesaw; 31. Mounting hole one; 32. Mounting hole two; 321. Arc-shaped protrusion; 33. Pivot hole one; 34. Pivot hole two; 35. Pivot plate; 351. Boss one; 352. Boss two; 36. Mounting platform; 4. Spring mechanism one; 41. Drum spring one; 42. Adjusting bolt one; 43. Finger 44. Needle screw plate 1; 45. Bowl-shaped washer 1; 5. Copper rod 1; 6. Soft spring washer; 7. Spring mechanism 2; 8. Drum-shaped spring 2; 9. Adjusting bolt 2; 10. Pointer screw plate 2; 11. Bowl-shaped washer 2; 12. Long copper rod; 13. Copper rod boss 1; 14. Copper rod boss 2; 15. Copper rod boss 3; 16. L-shaped lever; 17. Lever bushing; 18. Horizontal bar; 19. Horizontal bar lower protrusion; 10. Vertical bar; 11. Vertical bar protrusion; 12. Micro switch; 13. Switch point; 14. Lever shaft; 15. Spring mechanism 3; 16. Small spring; 17. Adjusting bolt 3. Detailed Implementation

[0019] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0020] To achieve more precise control over the switching action of the pressure switch, this utility model proposes a pneumatic switch, including a switch body 1. The bottom of the switch body 1 is a base 12, which is located on a base 11. A cover 13 is provided on the base 12, and a terminal block 14 is provided on the top of the cover 13. A diaphragm 2 is provided between the base 12 and the base 11. An annular pad 112 is provided on the top of the base 12, and the diaphragm 2 is installed above the annular pad 112. A spacer 113 and a large steel plate 114 are respectively provided above the diaphragm 2, and the large steel plate 114 is secured. At the bottom of the base 12, a sealing ring 111 is set on the inner circle side of the annular pad 112, forming a cavity 21 between the base 11 and the bottom of the diaphragm 2. The cavity 21 formed between the bottom of the diaphragm 2 and the top of the base 11 is connected to the air source connector 15. The air source connector 15 passes through the base 11, with its bottom connected to the air source and its top connected to the cavity 21. The air source of the air compressor enters the cavity 21 through the air source connector 15, thereby generating pressure on the diaphragm 2. A sealing ring is provided between the air source connector 15 and the base 11 to ensure sealing performance. The cover 13 is equipped with a seesaw 3, which includes mounting hole 1 31, mounting hole 2 32, fulcrum hole 1 33, and fulcrum hole 2 34. The fulcrum hole 1 33 and fulcrum hole 2 34 are used to connect to the fulcrum plate 35. The mounting hole 1 31 and mounting hole 2 32 are located on both sides of the fulcrum plate 35. The seesaw 3 is equipped with spring mechanism 1 4 and spring mechanism 2 6 on both sides of the fulcrum plate 35. Spring mechanism 1 4 is connected to mounting hole 1 31, and spring mechanism 2 6 is connected to mounting hole 2 32. The spring mechanism 1 4 and spring mechanism 2 6 form a lever structure with the fulcrum plate 35 as the center. This lever structure can realize the adjustment of the pressure holding range of the pressure switch. The adjustment is achieved by adjusting bolt 1 42 and adjusting bolt 2 62 and two nuts. A precision pressure gauge is connected to the outside to control the distance of adjusting bolt 1 42 and adjusting bolt 2 62. The adjusting nuts are stopped when the accurate value is reached.

[0021] The spring mechanism 4 includes a drum-shaped spring 41. The top of the drum-shaped spring 41 is connected to an adjusting bolt 42 via a pointer screw plate 43. The bottom of the drum-shaped spring 41 is connected to a copper rod 45 via a cup-shaped washer 44. The copper rod 45 is connected to the seesaw 3 and serves to support and position the drum-shaped spring 41. When adjusting the clamping force of the spring mechanism 4 on the seesaw 3, rotating the adjusting bolt 42 will cause the pointer screw plate 43 to move accordingly. The pressure value on the side of the spring mechanism 4 can be precisely adjusted by using the pointer scale.

[0022] like Figure 6As shown, the spring mechanism 26 includes a drum-shaped spring 261. The top of the drum-shaped spring 261 is connected to the adjusting bolt 262 via the pointer screw plate 263. The bottom of the drum-shaped spring 261 is connected to the long copper rod 65 via the cup-shaped washer 264. The long copper rod 65 not only supports and positions the drum-shaped spring 261, but also receives pressure from the cavity 21 through the diaphragm 2. The pressure in the cavity 21 pushes the long copper rod 65 upward, compressing the drum-shaped spring 261 and causing the L-shaped lever 7 to rotate. The long copper rod 65 includes a copper rod boss 1 651, a copper rod boss 2 652, and a copper rod boss 3 653. The copper rod boss 1 651 is located above the diaphragm 2, the copper rod boss 2 652 is connected to the L-shaped lever 7, and the copper rod boss 3 653 is located above the mounting hole 2 32. The copper rod boss 651 at the bottom of the long copper rod 65 contacts and connects to the diaphragm 2. The copper rod boss 652 is connected to the micro switch 8 via an L-shaped lever 7. The L-shaped lever 7 includes a lever sleeve 71, which is integrally formed with a horizontal rod 72 and a vertical rod 73. The horizontal rod 72 and the vertical rod 73 form an angle. The copper rod boss 652 is located below the horizontal rod 72 and abuts against the end of the horizontal rod 72. The vertical rod 73 contacts the micro switch 8 and rotates relative to the micro switch 8. It should be emphasized here that the copper rod boss 651... The thickness of 1 should be less than the thickness of the spacer 113. The spacer 113 is annular, and its interior forms a space for the copper rod boss 651 to move up and down. The thickness difference between the spacer 113 and the copper rod boss 651 is the maximum displacement of the long copper rod 65 in the longitudinal direction. When the pressure in the cavity 21 reaches the upper limit, it will push the long copper rod 65 to move upward. As the copper rod boss 652 moves upward, it drives the horizontal bar 72 to rotate clockwise. In turn, the lever sleeve 71 rotates clockwise, so that the vertical rod 73 is in close contact with the switching point 81 of the micro switch 8. The rotation of the L-shaped lever 7 is due to the lever shaft 82 on the outer shell of the micro switch 8. The lever sleeve 71 is sleeved on the outside of the lever shaft 82 and rotates and is connected to the lever shaft 82. The L-shaped lever 7, as a transmission structure, converts the vertical movement of the long copper rod 65 into the on / off switching of the switching point 81.

[0023] As a further improvement, the end of the crossbar 72 is provided with a lower crossbar protrusion 721, which abuts against the copper rod protrusion 652; the end of the vertical bar 73 is provided with a vertical bar protrusion 731, which abuts against the switching point 81 of the micro switch 8. The advantage of the lower crossbar protrusion 721 and the vertical bar protrusion 731 is that the action of the L-shaped lever 7 pressing the switching point 81 can be controlled to change linearly.

[0024] The seesaw 3 is also equipped with a spring mechanism 3 9, which is located outside the spring mechanism 2 6. The spring mechanism 3 9 includes a small spring 91 and an adjusting bolt 3 92 located on the small spring 91. The screw of the adjusting bolt 3 92 passes through the inside of the small spring 91 and is connected to the mounting platform 36. The mounting platform 36 is located outside the spring mechanism 2 6. Using the lever principle, the spring mechanism 3 9 is adjusted by rotating the adjusting bolt 3 92. The main function of the spring mechanism 3 9 is to support the other spring when one spring in the spring mechanism 1 4 and the spring mechanism 2 6 is completely released.

[0025] The seesaw 3 includes a mounting hole 31 for connecting spring mechanism 4 and a mounting hole 32 for connecting spring mechanism 6. A fulcrum hole 33 and a fulcrum hole 34 are provided between the mounting hole 31 and the mounting hole 32. The fulcrum hole 33 and the fulcrum hole 34 connect to a fulcrum plate 35. The top of the fulcrum plate 35 integrally extends a boss 351 and a boss 352. Boss 351 engages in the fulcrum hole 33, and boss 352 engages in the fulcrum hole 34. It is fixedly connected to the base 12; the two sides of the mounting hole 2 32 have arc-shaped protrusions 321, which form line contact with the bottom of the copper rod protrusion 3 653. This line contact ensures that the drum spring 2 61 is vertical when the seesaw 3 swings, and will not fluctuate due to the swing of the seesaw 3; the seesaw 3 is also provided with a soft spring pad 5, which is located at the bottom of the drum spring 2 61 and the drum spring 1 41, and plays the role of supporting the drum spring 2 61 and the drum spring 1 41.

[0026] In use, terminal 14 is connected to the power supply, and air source connector 15 is connected to the air compressor's air source. Assuming the pressure switch operates within the range of air pressure value A to air pressure value B, when the air pressure value in cavity 21 is greater than or equal to air pressure value B, the diaphragm 2 is compressed upwards by the high-pressure gas, causing deformation and pushing the copper rod boss 651. After the copper rod boss 651 receives significant pressure, the long copper rod 65 is pushed upwards. During this upward movement, the long copper rod 65 exerts a compressive force on the drum spring 61, and the copper rod boss 652 pushes the L-shaped lever 7 to rotate clockwise. The horizontal bar 72 changes from a slight... When the contact switch point 81 changes to a tight contact switch point 81, the micro switch 8 will send a stop pressurization signal to the air compressor operating end. As the high-pressure gas in the air compressor is released, the air source pressure value will gradually decrease, and the air pressure value in the cavity 21 will gradually decrease, causing the long copper rod 65 to be insufficient to keep the L-shaped lever 7 in tight contact with the switch point 81. The L-shaped lever 7 will rotate counterclockwise as the pressure value decreases. When the air pressure value in the cavity 21 is less than or equal to the air pressure value A, the crossbar 72 will make slight contact with the switch point 81, and the micro switch 8 will send a start pressurization signal to the air compressor operating end.

[0027] This utility model pressure switch achieves precise adjustment of the switch working range by setting spring mechanism 1 4 and spring mechanism 2 6 on the seesaw 3. The special design of the L-shaped lever 7 improves the sensitivity of the pressure switch, so that the micro switch 8 presents a linear pressure process, which is suitable for the on and off control of air compressors.

[0028] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A pneumatic switch, comprising a switch body (1), characterized in that: The bottom of the switch body (1) is a base (12), which is located on the base (11). A cover (13) is provided on the base (12). A diaphragm (2) is provided between the base (12) and the base (11). A cavity (21) is formed between the bottom of the diaphragm (2) and the top of the base (11). An air source connector (15) that passes through the base (11) is connected to the cavity (21). A seesaw (3) is provided inside the cover (13). The seesaw (3) has springs on both sides of its fulcrum plate (35). Spring mechanism one (4) and spring mechanism two (6). The bottom of the long copper rod (65) of spring mechanism two (6) is in contact with the diaphragm (2). The long copper rod (65) is connected to the micro switch (8) through the L-shaped lever (7). The L-shaped lever (7) includes a lever sleeve (71). The lever sleeve (71) is integrally formed with a horizontal bar (72) and a vertical bar (73). An angle is formed between the horizontal bar (72) and the vertical bar (73). The vertical bar (73) contacts the micro switch (8) and rotates relative to the micro switch (8).

2. The pneumatic switch as described in claim 1, characterized in that: The spring mechanism (4) includes a drum spring (41), the top of which is connected to an adjusting bolt (42) via a pointer screw plate (43), and the bottom of which is connected to a copper rod (45) via a cup-shaped washer (44). The copper rod (45) is connected to the seesaw (3).

3. The pneumatic switch as described in claim 2, characterized in that: The second spring mechanism (6) includes a second drum spring (61). The top of the second drum spring (61) is connected to the second adjusting bolt (62) via the second pointer screw plate (63). The bottom of the second drum spring (61) is connected to the long copper rod (65) via the second cup-shaped washer (64). The long copper rod (65) includes a first copper rod boss (651), a second copper rod boss (652), and a third copper rod boss (653). The first copper rod boss (651) is located above the diaphragm (2), and the second copper rod boss (652) is located below the crossbar (72) and abuts against the end of the crossbar (72).

4. The pneumatic switch as described in claim 3, characterized in that: The micro switch (8) has a lever shaft (82) on its housing, and a lever sleeve (71) is sleeved on the outside of the lever shaft (82) and rotatably connected to the lever shaft (82).

5. The pneumatic switch as described in claim 4, characterized in that: The end of the crossbar (72) is provided with a crossbar protrusion (721), which abuts against the long copper rod (65); the end of the vertical rod (73) is provided with a vertical rod protrusion (731), which abuts against the switching point (81) of the micro switch (8).

6. The pneumatic switch as described in claim 1, characterized in that: The seesaw (3) is also provided with a spring mechanism three (9), which is located outside the spring mechanism two (6). The spring mechanism three (9) includes a small spring (91) and an adjusting bolt three (92) located on the small spring (91).

7. The pneumatic switch as described in claim 6, characterized in that: The seesaw (3) includes a mounting hole 1 (31) connecting the spring mechanism 1 (4) and a mounting hole 2 (32) connecting the spring mechanism 2 (6). A fulcrum hole 1 (33) and a fulcrum hole 2 (34) are provided between the mounting hole 1 (31) and the mounting hole 2 (32). The fulcrum hole 1 (33) and the fulcrum hole 2 (34) are connected to the fulcrum plate (35). The mounting hole 2 (32) has arc protrusions (321) extending on both sides. The arc protrusions (321) form line contact with the copper rod boss 3 (653).

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