Mechanical waterproof pressure switch

Abstract

The utility model relates to the field of pressure switches, and discloses a mechanical waterproof pressure switch which comprises a pressure switch shell, a piston is arranged in the pressure switch shell, a mounting cavity is formed in the pressure switch shell, and a circular movable block is arranged in the mounting cavity. A first sealing ring is fixedly installed on the inner side wall of the installation cavity, liquid or gas enters the pressure switch shell through a connector and an inlet pipeline and pushes a piston, the piston compresses a spring immediately so as to sense the change of pressure, at the moment, an adjusting screw rod is rotated by a person, then a pushing column makes contact with a circular movable block and pushes the circular movable block to move forwards, and the sealing ring I is opened. And if the spring needs to be loosened, the spring can be released only by reversely rotating the adjusting screw rod, the device can effectively adjust the elastic force of the spring, and meanwhile, through the arrangement of the first sealing ring and the second sealing ring, water can be effectively prevented from entering the interior of the pressure switch shell through the threaded seat and the mounting hole.

Description

Technical Field

[0001] This application belongs to the technical field of pressure switches, and specifically relates to a mechanical waterproof pressure switch. Background Art

[0002] A mechanical waterproof pressure switch is a device used to automatically control the pressure of liquids and gases. It is widely used in fields such as air conditioners, refrigeration systems, pumps, and hydraulic systems. It turns on or off a circuit by detecting the pressure change of the medium to achieve an automatic control function. The waterproof design of this switch enables it to work normally in humid or harsh environments, protecting the internal components from moisture and extending the service life. Its working principle is usually based on the mechanical movement of a spring and a diaphragm, and the circuit is adjusted by setting a pressure value, which has the advantages of simple structure and high reliability.

[0003] For example, the utility model patent with the publication number CN210156310U discloses an adjustable pressure switch, which solves the disadvantages of complicated operation and insufficient control accuracy in adjusting the required pressure of the existing pressure switch. It includes an upper housing, a lower housing, and a U-shaped sliding block. The lower end of the upper housing is provided with an external thread, and an installation cavity is provided in the upper housing. A threaded hole is provided directly above the installation cavity, and a switch installation groove is provided in the upper housing. A switch is provided in the switch installation groove. A lower installation cavity is provided in the lower housing, and an internal thread matching the external thread of the upper housing is provided on the inner wall of the lower installation cavity. A pressure port is provided at the lower end of the lower housing. The U-shaped sliding block is arranged in the upper installation cavity, and vertical plates are provided on both sides of the U-shaped sliding block. The vertical plates are slidably matched with the inner wall of the upper installation cavity. The function of adjusting the pressure required to turn on the switch is realized by adjusting mechanical structures such as the U-shaped sliding block, spring, and adjusting block, and the operation is simple.

[0004] However, it is found in the actual use process that: this device drives the adjusting screw to rotate through a connecting rod, so that the adjusting block moves downward to adjust the elastic force of the compression spring;

[0005] However, the upper installation cavity of this device lacks effective sealing measures, resulting in the possibility of gaps between the internal and external threads of the adjusting screw connected by threads during long-term use. Such gaps allow external liquid to possibly penetrate into the pressure switch, thus affecting its waterproof performance. Therefore, a mechanical waterproof pressure switch is provided. Utility Model Content

[0006] The purpose of this application is to provide a mechanical waterproof pressure switch to solve the above-mentioned problems.

[0007] The technical solution adopted in this application is as follows: A mechanical waterproof pressure switch includes a pressure switch housing. Inside the pressure switch housing, there is a piston. An installation cavity is provided inside the pressure switch housing. Inside the installation cavity, there is a circular movable block. A first sealing ring is fixedly installed on the inner side wall of the installation cavity. A positioning groove is provided at one end of the circular movable block close to the piston. The top end of the piston is inserted into the positioning groove. A spring is arranged on the outer surface of the circular movable block. An installation hole is provided at the front end of the pressure switch housing. The installation hole communicates with the installation cavity. A push rod is arranged inside the installation hole. One end of the push rod is in contact with the top surface of the circular movable block. A second sealing ring is fixedly installed on the inner side wall of the installation hole. A threaded seat is fixedly installed on the front side of the pressure switch housing. An adjusting screw is threadedly connected inside the threaded seat. A circular groove is provided at one end of the push rod away from the circular movable block. One end of the adjusting screw extends into the circular groove. One end of the adjusting screw is fixed to the inner bottom surface of the circular groove. The other end of the adjusting screw is fixedly installed with a rotating end head.

[0008] In a preferred embodiment, an inlet pipe is fixedly installed on the rear side of the pressure switch housing. One end of the inlet pipe away from the pressure switch housing is threadedly connected with a connector.

[0009] In a preferred embodiment, a sealing ring is fixedly installed on the outer surface of the end of the piston away from the circular movable block.

[0010] In a preferred embodiment, a sealing cover is fixedly installed on the left side of the pressure switch housing through screws provided.

[0011] In a preferred embodiment, two mounting plates are fixedly installed on the rear side of the pressure switch housing. Fixed holes are provided on one side of each of the two mounting plates.

[0012] In a preferred embodiment, external threads are provided on the outer surface of one end of the connector.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are:

[0014] 1. In this application, due to the adoption of the above-mentioned solution, the liquid or gas in the pipeline enters the interior of the pressure switch housing through the connector and the pipeline. At this time, the liquid or gas will push the piston, and the piston will immediately compress the spring to sense the change in pressure, thereby realizing the control or alarm function. If the user needs to adjust the elastic force of the spring, just rotate the adjusting screw towards the pressure switch housing. At this time, the adjusting screw will push the push column forward, and then the push column will contact the circular movable block and push it forward, thereby increasing the compression force of the spring. If it is necessary to relax the spring, just rotate the adjusting screw in the reverse direction to make the push column move backward, so that the spring can be released. This device can effectively adjust the elastic force of the spring. At the same time, through the set sealing ring 1 and sealing ring 2, the waterproof effect of the pressure switch housing is effectively improved, preventing water from entering the interior of the pressure switch housing through the threaded seat and the mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of this application;

[0016] Figure 2 is a schematic diagram of the internal structure of the pressure switch housing of this application;

[0017] Figure 3 is a schematic diagram of the structure without the piston installed in this application.

[0018] Reference numerals in the figure: 1. Pressure switch housing; 2. Piston; 3. Installation cavity; 4. Circular movable block; 5. Positioning groove; 6. Spring; 7. Mounting hole; 8. Push column; 9. Threaded seat; 10. Adjusting screw; 11. Rotating end; 12. Sealing ring 2; 13. Sealing ring 1; 14. Inlet pipeline; 15. Connector; 16. Sealing ring; 17. Sealing shell cover; 18. Mounting plate; 19. Fixing hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0020] Reference Figure 1, a mechanical waterproof pressure switch, including a pressure switch housing 1. A sealing cover 17 is fixedly installed on the left side of the pressure switch housing 1 through screws provided; a cable hole is opened on the outer surface of the pressure switch housing 1, so that a waterproof connector is conveniently installed in the cable hole, enabling the cable to pass through the inside of the waterproof connector and be electrically connected to an external controller or alarm. Through the provided sealing cover 17, it is convenient to perform a sealing operation on the pressure switch housing 1. When the screws are unscrewed by personnel, the internal structure of the pressure switch housing 1 can be inspected and maintained.

[0021] Reference Figure 1 , two mounting plates 18 are fixedly installed on the rear side of the pressure switch housing 1, and fixing holes 19 are opened on one side of each of the two mounting plates 18; through the provided two mounting plates 18 and fixing holes 19, it is convenient for personnel to use bolts to fixedly install the pressure switch housing 1 in a suitable position.

[0022] Reference Figure 1 、 Figure 2 and Figure 3 , a piston 2 is arranged inside the pressure switch housing 1, an installation cavity 3 is opened inside the pressure switch housing 1, a circular movable block 4 is arranged inside the installation cavity 3, and a first sealing ring 13 is fixedly installed on the inner side wall of the installation cavity 3; through the provided installation cavity 3, it is convenient to install the circular movable block 4, and through the provided first sealing ring 13, it is convenient to seal and waterproof the installation cavity 3.

[0023] Reference Figure 2 、 Figure 3 , a positioning groove 5 is opened at one end of the circular movable block 4 close to the piston 2, the top end of the piston 2 is inserted into the inside of the positioning groove 5, and a spring 6 is arranged on the outer surface of the circular movable block 4; through the provided positioning groove 5, it is convenient for the top end of the piston 2 to be inserted into it, so that when the elastic force of the spring 6 is adjusted subsequently, the positions of the piston 2 and the circular movable block 4 will not deviate.

[0024] Reference Figure 2 、 Figure 3 , an installation hole 7 is opened at the front end of the pressure switch housing 1, the installation hole 7 is communicated with the installation cavity 3, a push rod 8 is arranged inside the installation hole 7, one end of the push rod 8 is in contact with the top surface of the circular movable block 4, and a second sealing ring 12 is fixedly installed on the inner side wall of the installation hole 7; through the provided push rod 8, it is convenient to subsequently push the circular movable block 4 in the direction of the piston 2, so as to conveniently adjust the elastic force of the spring 6, and through the provided second sealing ring 12, it is convenient to improve the sealing and waterproof effect of the installation hole 7.

[0025] Reference Figure 1 、 Figure 2 and Figure 3, a threaded seat 9 is fixedly installed on the front side of the pressure switch housing 1. An adjusting screw rod 10 is threadedly connected inside the threaded seat 9. A circular groove is formed at one end of the pushing column 8 away from the circular movable block 4. One end of the adjusting screw rod 10 extends into the interior of the circular groove, and one end of the adjusting screw rod 10 is fixed to the inner bottom surface of the circular groove. The other end of the adjusting screw rod 10 is fixedly installed with a rotating end 11; by providing the threaded seat 9, it is convenient for the adjusting screw rod 10 to be threadedly connected inside it. In this way, when a person rotates the adjusting screw rod 10, it will drive the pushing column 8 to move forward to contact the circular movable block 4 and push the spring 6 to move forward, facilitating the adjustment of the elastic force of the spring 6.

[0026] Reference Figure 1 , Figure 2 and Figure 3 , an inlet pipe 14 is fixedly installed on the rear side of the pressure switch housing 1. One end of the inlet pipe 14 away from the pressure switch housing 1 is threadedly connected with a connector 15, and an external thread is provided on the outer surface of one end of the connector 15; by providing the inlet pipe 14 and the connector 15, it is convenient for external liquid or gas to enter the interior of the pressure switch housing 1 through the main pipe, the connector 15 and the inlet pipe 14. In this way, it is convenient for the subsequent pressure switch to sense the pressure change and trigger the switch when the set pressure value is reached, thereby realizing the control or alarm function. By providing the external thread, it is convenient for the pressure switch housing 1 to be connected with the internal thread hole provided on the main pipe, so that it is convenient to install the pressure switch.

[0027] Reference Figure 2 , Figure 3 , a sealing ring 16 is fixedly installed on the outer surface of one end of the piston 2 away from the circular movable block 4; by providing the sealing ring 16, it is convenient to seal the bottom of the piston 2, so that the liquid and gas can push the piston 2 to move, thus facilitating the sensing of the pressure change.

[0028] The implementation principle of an embodiment of a mechanical waterproof pressure switch in this application is as follows: First, the operator installs the pressure switch housing 1 in a suitable position. Subsequently, the liquid or gas in the main pipeline enters the interior of the pressure switch housing 1 through the connector 15 and the inlet pipe 14. At this time, the liquid or gas entering the interior of the housing will push the piston 2, and the piston 2 will then compress the spring 6 to sense the change in pressure. When the pressure reaches the set value, the diaphragm of the piston 2 will trigger the switch, thereby realizing the control or alarm function. If the operator needs to adjust the elasticity of the spring 6, only rotate the adjusting screw 10 towards the pressure switch housing 1. At this time, the adjusting screw 10 will push the push column 8 forward, and then the push column 8 will contact the circular movable block 4 and push it forward, thereby increasing the compression force of the spring 6. If it is necessary to relax the spring 6, only rotate the adjusting screw 10 in the reverse direction to make the push column 8 move backward, facilitating the release of the spring 6. This device has a simple structure and is easy to operate. It can effectively adjust the elasticity of the spring 6. At the same time, through the setting of the first sealing ring 13 and the second sealing ring 12, the waterproof effect of the pressure switch housing 1 is effectively improved, preventing water from entering the interior of the pressure switch housing through the threaded seat 9 and the mounting hole 7.

[0029] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of this application.

Claims

1. A mechanical waterproof pressure switch, comprising a pressure switch housing (1), characterized in that: A piston (2) is arranged inside the pressure switch housing (1), a mounting cavity (3) is provided inside the pressure switch housing (1), a circular movable block (4) is arranged inside the mounting cavity (3), a sealing ring (13) is fixedly installed on the inner wall of the mounting cavity (3), a positioning groove (5) is provided at one end of the circular movable block (4) close to the piston (2), the top end of the piston (2) is inserted into the positioning groove (5), a spring (6) is provided on the outer surface of the circular movable block (4), a mounting hole (7) is provided at the front end of the pressure switch housing (1), the mounting hole (7) is connected to the mounting cavity (3), and the mounting hole (7) is connected to the mounting cavity (3). ) is provided with a push column (8) inside, one end of the push column (8) is in contact with the top surface of the circular movable block (4), a sealing ring 2 (12) is fixedly installed on the inner wall of the mounting hole (7), a threaded seat (9) is fixedly installed on the front side of the pressure switch housing (1), the internal thread of the threaded seat (9) is connected with an adjusting screw (10), a circular groove is formed at one end of the push column (8) away from the circular movable block (4), one end of the adjusting screw (10) extends into the inside of the circular groove, one end of the adjusting screw (10) is fixed to the inner bottom surface of the circular groove, and the other end of the adjusting screw (10) is fixedly installed with a rotating end (11).

2. A mechanical waterproof pressure switch according to claim 1, characterized in that: An inlet pipe (14) is fixedly mounted on the rear side of the pressure switch housing (1), and a connector (15) is threadedly connected to one end of the inlet pipe (14) away from the pressure switch housing (1).

3. A mechanical waterproof pressure switch according to claim 1, characterized in that: A sealing ring (16) is fixedly mounted on the outer surface of one end of the piston (2) away from the circular movable block (4).

4. A mechanical waterproof pressure switch according to claim 1, characterized in that: A sealing shell cover (17) is fixedly mounted on the left side of the pressure switch housing (1) by means of provided screws.

5. A mechanical waterproof pressure switch according to claim 1, characterized in that: Two mounting plates (18) are fixedly mounted on the rear side of the pressure switch housing (1), and a fixing hole (19) is provided on one side of the two mounting plates (18).

6. A mechanical waterproof pressure switch according to claim 2, characterized in that: An outer surface of one end of the connector (15) is provided with an external thread.

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