Mechanical automatic control pressure switch

Abstract

This utility model discloses a mechanical automatic control pressure switch, including a housing, a plastic base plate, and an adjusting screw fixed together. A bracket is fixed on the plastic base plate, and a fixed plate is provided on the top of the bracket. A floating nut extending into the fixed plate is provided on the top of the bracket. A switch contact plate is installed on the fixed plate by a lever pin, a torsion spring, and a retaining spring. The adjusting screw passes through the floating nut on the fixed plate and extends into the bracket. A fixed nut on the lower side of the fixed plate is threaded onto the adjusting screw at the bottom of the floating nut. A pressure adjusting handwheel and a pressure differential adjusting nut are connected to the top of the adjusting screw. A plastic bracket is fixed on one side of the bracket. A wiring assembly and a micro switch are installed on the plastic bracket. The driving end of the switch contact plate presses against the micro switch. A second spring is provided inside the bracket. The lower part of the adjusting screw passes through the second spring and is connected to the pressure adjusting nut. The advantages are: novel structure, wide pressure adjustment range, and high sensitivity of the micro switch initiation and shutdown.

Description

Technical Field

[0001] This utility model relates to a pressure switch, and more particularly to a mechanical automatic control pressure switch. Background Technology

[0002] This pressure switch belongs to the field of industrial automation and control engineering, and is also used in mechanical engineering, electrical engineering, instrumentation and other related fields.

[0003] Existing similar products have the following drawbacks: small adjustment range and low sensitivity, which affect the quality and performance of the products. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a mechanical automatic control pressure switch to address the shortcomings of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following measures:

[0006] A mechanical automatic control pressure switch includes a housing, a plastic base plate, and an adjusting screw fixed together. A bracket is fixed to the plastic base plate, and a fixed plate is located on the top of the bracket. A first screw on the top of the bracket, in conjunction with a nut, fixes the fixed plate to the bracket. A floating nut extends into the fixed plate from the top of the bracket. A switch contact plate is mounted on the fixed plate via a lever pin, a torsion spring, and a retaining spring. The adjusting screw passes through the floating nut on the fixed plate and extends into the bracket. A fixed nut on the lower side of the fixed plate is threaded onto the adjusting screw below the floating nut. A pressure adjusting handwheel and a differential pressure adjusting nut are connected to the top of the adjusting screw. A first spring is sleeved on the upper section of the adjusting screw, with one end of the first spring pressing against the differential pressure adjusting nut. The upper and lower ends press against the cap at the top of the adjusting screw. A slotted locking screw connects the adjusting handwheel to the fixed plate. A plastic bracket is fixed on one side of the bracket. A wiring assembly and a micro switch are installed on the plastic bracket. The drive end of the switch contact plate presses against the micro switch. A second spring is provided inside the bracket. The lower part of the adjusting screw passes through the second spring and is connected to the adjusting nut. A torsion spring adjusting plate is installed on the side wall of the bracket through a third screw and an anti-loosening nut. One end of the torsion spring presses against the switch contact plate, and the other end presses against the torsion spring adjusting plate. An aluminum connector is installed at the bottom of the bracket through a connector screw. A diaphragm and an aluminum pressure block are provided between the aluminum connector and the bracket. The micro switch and the wiring assembly are connected to the power supply through a power connection cable.

[0007] The outer shell and the plastic base plate are fixedly connected by outer shell screws, and a spring washer is provided on the fixing nut on the lower side of the fixing plate;

[0008] The bracket is fixed to the plastic base plate by bracket screws;

[0009] The micro switch is mounted on a plastic bracket via a micro switch cover and a second flat-tail screw, and the wiring assembly is mounted on the plastic bracket via a third flat-tail screw.

[0010] A second O-ring is provided between the aluminum pressure block and the aluminum connector, and a first O-ring is provided between the outer shell and the plastic base plate;

[0011] The aluminum connector is externally mounted with an aluminum connector hanger via a fourth flat-tail screw.

[0012] The advantages of this invention are: practicality, novel structure, wide voltage regulation range, high sensitivity of microswitch start-up and shutdown, and better dustproof and waterproof performance. Attached Figure Description

[0013] Figure 1 This is an exploded view of one side of the present invention.

[0014] Figure 2 This is an exploded structural diagram of the other side of this utility model.

[0015] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0016] Figure 4 This is a schematic diagram showing the disassembled structure of the pressure regulating handwheel of this utility model. Detailed Implementation

[0017] A mechanical automatic control pressure switch includes a housing 1, a plastic base plate 3, and an adjusting screw 22 fixed together. A bracket 16 is fixed to the plastic base plate 3. A fixing plate 33 is provided on the top of the bracket 16. A first screw 20 on the top of the bracket 16, in conjunction with a nut 19, fixes the fixing plate 33 to the bracket 16. A floating nut 18 extending into the fixing plate 33 is provided on the top of the bracket 16. A switch contact plate 8 is installed on the fixing plate 33 via a lever pin 14, a torsion spring 13, and a retaining spring 7. The adjusting screw 22 passes through the floating nut 18 on the fixing plate 33 and extends into the bracket 16. A fixing nut 23 on the lower side of the fixing plate is threaded onto the adjusting screw 22 below the floating nut 18. A pressure adjusting handwheel 11 and a pressure differential adjusting nut 12 are connected to the upper top of the adjusting screw 22. A first spring 9 is sleeved on the upper section of the adjusting screw 22, with one end of the first spring 9 pressing against the pressure differential adjusting nut 12. The upper end is pressed against the cap at the top of the adjusting screw 22. A slotted locking screw 10 is connected between the adjusting handwheel 11 and the fixing plate 33. A plastic bracket 5 is installed and fixed on one side of the bracket 16. A wiring assembly 4 and a micro switch 37 are installed on the plastic bracket 5. The driving end 801 of the switch contact plate 8 is pressed on the micro switch 37. A second spring 24 is provided inside the bracket 16. The lower part of the adjusting screw 22 passes through the second spring 24 and is connected to the adjusting nut 25. A torsion spring adjusting plate 15 is installed on the side wall of the bracket 16 through a third screw 34 and an anti-loosening nut 41. One end of the torsion spring 13 is pressed on the switch contact plate 8 and the other end is pressed on the torsion spring adjusting plate 15. An aluminum connector 29 is installed at the bottom of the bracket 16 through a connector screw 32. A diaphragm 27 and an aluminum pressure block 30 are provided between the aluminum connector 29 and the bracket 16. The micro switch 37 and the wiring assembly 4 are connected to the power supply through a power connection wire.

[0018] The outer shell 1 and the plastic base plate 3 are fixedly connected by outer shell screws 2, and a spring washer 21 is provided on the fixing nut 23 on the lower side of the fixing plate.

[0019] The bracket 16 is fixed to the plastic base plate 3 by the bracket screw 17.

[0020] The micro switch 37 is mounted on the plastic bracket 5 via the micro switch cover 6 and the second flat-tail screw 35, and the wiring assembly 4 is mounted on the plastic bracket 5 via the third flat-tail screw 36.

[0021] A second O-ring 28 is provided between the aluminum pressure block 30 and the aluminum connector 29, and a first O-ring 26 is provided between the outer shell 1 and the plastic base plate 3.

[0022] The aluminum connector 29 is externally mounted with an aluminum connector bracket 40 via a fourth flat-tail screw 38.

[0023] like Figure 1-4As shown, the switch in this application, through structural improvements, offers a wide pressure adjustment range, allowing for adjustment of both small pressure and small pressure differential, as well as small pressure and large pressure differential, and vice versa. Pressure and pressure differential adjustment are achieved through a pressure instrument using an inflation / deflation cycle. A replaceable high-performance microswitch is employed, ensuring high sensitivity during activation and deactivation. The fully enclosed design provides superior dust and water resistance.

[0024] Pressure adjustment: First, remove the flathead locking screw 10, adjust the pressure according to the indication on the pressure adjusting handwheel 11, and after adjustment, install the flathead locking screw 10.

[0025] Differential pressure adjustment: First, remove the flat locking screw 10, connect the aluminum connector 100 to the air source, inflate to about 2 kg of the target pressure value, press the pressure regulating handwheel 11 to disengage from the adjusting screw 22, and adjust the differential pressure in the opposite direction of the pressure regulating handwheel 11. After adjustment, install the flat locking screw 10.

[0026] Wiring assembly 4 includes terminal 1 as a common terminal, terminal 2 as a normally closed terminal, and terminal 4 as a normally open terminal. When the internal pressure of the aluminum connector drops to or is within the lower limit value, terminals 1 and 2 are connected, and terminals 1 and 4 are disconnected. When the upper limit pressure value is greater than or higher than the lower limit pressure value, terminals 1 and 2 are disconnected, and terminals 1 and 4 are connected.

Claims

1. A mechanical automatic control pressure switch, comprising a housing (1), a plastic base plate (3), and an adjusting screw (22) fixed together, characterized in that: A bracket (16) is fixed on the plastic base plate (3). A fixing plate (33) is provided on the top of the bracket (16). The first screw (20) on the top of the bracket (16) and the nut (19) fix the fixing plate (33) on the bracket (16). A floating nut (18) is provided on the top of the bracket (16) and extends into the fixing plate (33). A switch contact plate (8) is installed on the fixing plate (33) through a lever pin (14), a torsion spring (13) and a retaining spring (7). An adjusting screw (22) passes through the fixing plate (33). The floating nut (18) on the fixed plate (33) extends into the bracket (16). The adjusting screw (22) at the lower part of the floating nut (18) is threaded with the fixing nut (23) on the lower side of the fixed plate. The upper top of the adjusting screw (22) is connected to the pressure adjusting handwheel (11) and the pressure difference adjusting nut (12). The upper section of the adjusting screw (22) is fitted with a first spring (9). One end of the first spring (9) presses against the pressure difference adjusting nut (12), and the other end presses against the cap at the top of the adjusting screw (22). A slotted locking screw (10) is connected between the adjusting handwheel (11) and the fixing plate (33). A plastic bracket (5) is fixed on one side of the bracket (16). A wiring assembly (4) and a micro switch (37) are installed on the plastic bracket (5). The drive end (801) of the switch contact plate (8) presses on the micro switch (37). A second spring (24) is provided inside the bracket (16). The lower part of the adjusting screw (22) passes through the second spring (24) and is connected to the adjusting nut (25). A torsion spring adjusting plate (15) is installed on the side wall of 6) by a third screw (34) and a lock nut (41). One end of the torsion spring (13) presses on the switch contact plate (8) and the other end presses on the torsion spring adjusting plate (15). An aluminum connector (29) is installed at the bottom of the bracket (16) by a connector screw (32). A diaphragm (27) and an aluminum pressure block (30) are provided between the aluminum connector (29) and the bracket (16). The micro switch (37) and the wiring assembly (4) are connected to the power supply through a power connection line.

2. The mechanical automatic control pressure switch according to claim 1, characterized in that: The outer shell (1) and the plastic base plate (3) are fixedly connected by the outer shell screws (2), and a spring washer (21) is provided on the fixing nut (23) on the lower side of the fixing plate.

3. A mechanical automatic control pressure switch according to claim 1 or 2, characterized in that: The bracket (16) is fixed to the plastic base plate (3) by bracket screws (17).

4. A mechanical automatic control pressure switch according to claim 3, characterized in that: The micro switch (37) is mounted on the plastic bracket (5) via the micro switch cover (6) and the second flat tail screw (35), and the wiring assembly (4) is mounted on the plastic bracket (5) via the third flat tail screw (36).

5. A mechanical automatic control pressure switch according to claim 4, characterized in that: A second O-ring (28) is provided between the aluminum pressure block (30) and the aluminum connector (29), and a first O-ring (26) is provided between the outer shell (1) and the plastic base plate (3).

6. A mechanical automatic control pressure switch according to claim 5, characterized in that: The aluminum connector (29) is externally mounted with an aluminum connector hanger (40) via a fourth flat tail screw (38).

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