A differential pressure switch

Abstract

This utility model discloses a differential pressure switch, including a housing, a bottom cover fixed to the lower end of the housing by hexagonal screws, a cavity between the housing and the bottom cover, a diaphragm inside the cavity, a positioning plate on the upper surface of the diaphragm, a touch switch on the housing, the contact end of the touch switch located inside the cavity, a pressure plate rotatably connected to the lower surface of the housing by a pin, the pressure plate having an L-shaped structure, the pressure plate corresponding to the contact end of the touch switch, and a pressure regulating component on the housing to adjust the rotation force of the pressure plate. The front surfaces of the housing and the bottom cover are respectively provided with inlet one and inlet two, both of which communicate with the cavity. Inlet one is the high-pressure inlet. This differential pressure switch has a simple structure, is easy to operate, and allows for adjustment of the differential pressure. During use, the switch can operate accurately when the differential pressure reaches the set value, resulting in better performance.

Description

Technical Field

[0001] This utility model relates to the field of differential pressure switch technology, specifically a differential pressure switch. Background Technology

[0002] A differential pressure switch is a special type of control switch that controls the opening and closing of a circuit based on the pressure difference between its components and by transmitting electrical signals. In essence, it uses the pressure difference between two pipes to send an electrical signal. Existing differential pressure switches typically detect the pressure at both ends using electrical components, which are prone to damage and inconvenient to use. Furthermore, existing mechanical differential pressure switches cannot adjust the pressure difference, resulting in poor performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a differential pressure switch with simple structure and easy operation. It can adjust the differential pressure of the switch and can work accurately when the differential pressure reaches the set value during use, resulting in better performance and effectively solving the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a differential pressure switch, comprising a housing, a bottom cover fixed to the lower end of the housing by a hexagonal screw, a cavity provided between the housing and the bottom cover, a diaphragm provided inside the cavity, a positioning plate provided on the upper surface of the diaphragm, a touch switch provided on the housing, the contact end of the touch switch located inside the cavity, a pressure plate rotatably connected to the lower surface of the housing by a pin, the pressure plate having an L-shaped structure, the pressure plate corresponding to the contact end of the touch switch, and a pressure regulating component provided on the housing to adjust the rotation force of the pressure plate; the front surfaces of the housing and the bottom cover are respectively provided with inlet one and inlet two, both of which communicate with the cavity, and inlet one being the high-pressure inlet.

[0005] Furthermore, the upper end of the housing is fixed with a top cover by bolts, and the top cover and the housing are sealed by a sealing ring.

[0006] Furthermore, the edge of the diaphragm is clamped and fixed by the housing and the bottom cover, and a rubber sealing ring is provided at the edge of the diaphragm, which improves the sealing effect between the housing and the bottom cover.

[0007] Furthermore, the pressure regulating component includes a spring, one end of which is connected to the pressure plate, and the other end of which is fixed to a slider. The lower surface of the housing is provided with a groove corresponding to the slider, and the housing is provided with a rotatably connected pressure regulating shaft. The part of the pressure regulating shaft located inside the cavity is provided with an external thread, and the external thread of the pressure regulating shaft is connected to the slider through a threaded connection. The end of the pressure regulating shaft located outside the housing is provided with a rotating handle. By rotating the pressure regulating shaft, the slider can be driven to slide, which in turn drives the spring to move. The movement of the spring can drive the pressure plate to rotate, thereby adjusting the distance between the pressure plate and the touch switch. The greater the distance between the pressure plate and the touch switch, the greater the pressure required when the switch is touched, thereby adjusting the pressure required when the switch is touched.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: Rotating the pressure shaft can drive the slider to slide, which in turn drives the spring to move. The spring's movement drives the pressure plate to rotate, thereby adjusting the distance between the pressure plate and the touch switch. The greater the distance between the pressure plate and the touch switch, the greater the pressure required for touch. High-pressure liquid enters the cavity through inlet one, while low-pressure liquid enters through inlet two. The liquid pressure lifts the diaphragm and positioning plate, which in turn pushes the pressure plate to rotate. The rotating pressure plate then contacts the touch switch, thus activating the touch switch. This differential pressure switch has a simple structure and is easy to operate. It allows for adjustment of the differential pressure, and the switch operates accurately when the differential pressure reaches the set value, resulting in better performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the pressure regulating component of this utility model; Figure 3 This is a top view of the structure of this utility model. In the diagram: 1. Housing, 2. Diaphragm, 3. Positioning plate, 4. Inlet 1, 5. Bottom cover, 6. Inlet 2, 7. Pressure regulating component, 71. Spring, 72. Slider, 73. Pressure adjusting shaft, 8. Touch switch, 9. Top cover, 10. Rubber sealing ring, 11. Pin, 12. Pressure plate, 13. Cavity. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] Please see Figure 1-2 This utility model provides a technical solution: a differential pressure switch, including a housing 1, a bottom cover 5 fixed to the lower end of the housing 1 by hexagonal screws, a cavity 13 between the housing 1 and the bottom cover 5, a diaphragm 2 disposed inside the cavity 13, a positioning piece 3 disposed on the upper surface of the diaphragm 2, a touch switch 8 disposed on the housing 1, the contact end of the touch switch 8 located inside the cavity 13, a pressure plate 12 rotatably connected to the lower surface of the housing 1 by a pin 11, the pressure plate 12 having an L-shaped structure, the pressure plate 12 corresponding to the contact end of the touch switch 8, and a pressure regulating component disposed on the housing 1 to adjust the rotation force of the pressure plate 12. 7. The front surfaces of the housing 1 and the bottom cover 5 are respectively provided with inlet 4 and inlet 6. Both inlet 4 and inlet 6 are connected to the cavity 13. Inlet 4 is a high-pressure inlet, through which high-pressure liquid enters the cavity 13. Low-pressure liquid enters the cavity 13 through inlet 6. The liquid pressure lifts the diaphragm 2 and the positioning plate 3, which in turn causes the pressure plate 12 to rotate. The rotation of the pressure plate 12 causes it to contact the touch switch 8, thereby activating the touch switch 8. The upper end of the housing 1 is fixed with a top cover 9 by bolts, and the top cover 9 is sealed to the housing 1 by a sealing ring. The edge of the diaphragm 2 is clamped and fixed by the housing 1 and the bottom cover 5, and a rubber sealing ring 10 is provided at the edge of the diaphragm 2. The rubber sealing ring 10 improves the sealing effect between the housing 1 and the bottom cover 5. The pressure regulating component 7 includes a spring 71. One end of the spring 71 is connected to the pressure plate 12, and the other end of the spring 71 is fixed to a slider 72. The lower surface of the housing 1 is provided with a groove corresponding to the slider 72, and a rotatably connected pressure regulating shaft 73 is provided on the housing 1. The part of the pressure regulating shaft 73 located inside the cavity 13 is provided with an external thread. The external thread of the pressure regulating shaft 73 is connected to the slider 72 by a threaded connection. The pressure adjusting shaft 73 has a rotating handle at one end located on the outside of the housing 1. Rotating the pressure adjusting shaft 73 causes the slider 72 to slide, which in turn causes the spring 71 to move. The movement of the spring 71 causes the pressure plate 12 to rotate, thereby adjusting the distance between the pressure plate 12 and the touch switch 8. The greater the distance between the pressure plate 12 and the touch switch 8, the greater the pressure required when the switch is touched. This differential pressure switch has a simple structure and is easy to operate. It can adjust the differential pressure of the switch. During use, the switch can work accurately when the differential pressure reaches the set value, resulting in better performance.

[0012] In use: Rotating the pressure shaft 73 causes the slider 72 to slide, which in turn causes the spring 71 to move. The movement of the spring 71 causes the pressure plate 12 to rotate, thereby adjusting the distance between the pressure plate 12 and the touch switch 8. The greater the distance between the pressure plate 12 and the touch switch 8, the greater the pressure required when the switch is touched. Liquid with high pressure enters the cavity 13 through inlet 4, while liquid with low pressure enters the cavity 13 through inlet 6. The liquid pressure lifts the diaphragm 2 and the positioning plate 3, which in turn causes the pressure plate 12 to rotate. The rotation of the pressure plate 12 brings it into contact with the touch switch 8, thus enabling the touch switch 8 to operate.

[0013] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A differential pressure switch comprising a housing (1), characterized in that: The lower end of the housing (1) is fixed with a bottom cover (5) by a hexagonal screw. A cavity (13) is provided between the housing (1) and the bottom cover (5). A diaphragm (2) is provided inside the cavity (13). A positioning piece (3) is provided on the upper surface of the diaphragm (2). A touch switch (8) is provided on the housing (1). The touch end of the touch switch (8) is located inside the cavity (13). A pressure plate (12) is rotatably connected to the lower surface of the housing (1) by a pin (11). The pressure plate (12) has an L-shaped structure. The pressure plate (12) corresponds to the touch end of the touch switch (8). A pressure regulating component (7) is provided on the housing (1) to adjust the rotation force of the pressure plate (12). An inlet one (4) and an inlet two (6) are provided on the front surfaces of the housing (1) and the bottom cover (5), respectively. Both inlet one (4) and inlet two (6) are connected to the cavity (13). Inlet one (4) is a high-pressure inlet.

2. A differential pressure switch according to claim 1, wherein: The upper end of the housing (1) is fixed with a top cover (9) by bolts, and the top cover (9) and the housing (1) are sealed by a sealing ring.

3. A differential pressure switch according to claim 1, characterized in that: The edge of the diaphragm (2) is clamped and fixed by the housing (1) and the bottom cover (5), and a rubber sealing ring (10) is provided at the edge of the diaphragm (2). The rubber sealing ring (10) makes the sealing effect between the housing (1) and the bottom cover (5) better.

4. A differential pressure switch according to claim 1, wherein: The pressure regulating component (7) includes a spring (71), one end of which is connected to the pressure plate (12), and the other end of which is fixed with a slider (72). The lower surface of the housing (1) is provided with a groove corresponding to the slider (72), and the housing (1) is provided with a rotating pressure regulating shaft (73). The part of the pressure regulating shaft (73) located inside the cavity (13) is provided with an external thread. The external thread of the pressure regulating shaft (73) is connected to the slider (72) by a threaded connection, and the end of the pressure regulating shaft (73) located outside the housing (1) is provided with a rotating handle.

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