Shock absorption type micro differential pressure switch

Abstract

The utility model discloses a shock absorption type micro differential pressure switch, which comprises a signal end protection installation plastic shell and a pressure cavity low-pressure end shell, the pressure cavity low-pressure end shell is fixed at the lower end of the signal end protection installation plastic shell through a bolt, and a sheath lead cable is fixedly arranged on one side of the signal end protection installation plastic shell. A wiring terminal is fixedly arranged on one side of the sheath wire cable, and a shock absorption mechanism is arranged between the signal end protection installation plastic shell and the pressure cavity low-pressure end shell. In the process of the utility model, the ball head thread transmission idle rod does not directly push the spherical button, the shock absorption pressure spring needs to overcome the pre-tightening force of the shock absorption pressure spring to deform, and a period of time is needed in the process of pushing the spherical button to overcome the pre-tightening force of the shock absorption pressure spring, so that the effect of eliminating differential pressure fluctuation in the time process is achieved; and the spherical button pushes the microswitch to perform on-off switching so as to output a stable pressure difference switching signal to the outside.

Description

Technical Field

[0001] The utility model relates to the field of micro-pressure difference switch equipment, in particular to a vibration-absorbing micro-pressure difference switch. Background Art

[0002] The vibration-absorbing micro-pressure differential controller is widely used in water-cooled or air-cooled units such as plate heat exchangers, shell-and-tube heat exchangers, and shell-and-tube heat exchangers. It is used to control the water flow and monitor the status of the water pump and water filter to ensure the normal operation of the heat exchanger. The vibration-absorbing micro-pressure differential controller is an automatic controller.

[0003] The transmission structure of the micro differential pressure controller directly drives the switch shearing through the displacement of the guide rod during the differential pressure transmission process to achieve the output of the switch quantity change, which has the following shortcomings:

[0004] 1. Because the transmission process in the product structure is direct-acting transmission, when the liquid circuit (air circuit) system is unstable (the pressure in the high and low pressure pipelines is unstable in a short period of time - high and low pressure peaks and valleys appear frequently), the pressure difference switching signal is also output to the control system at a high frequency. In the absence of a reasonable setting of the sampling cycle of the control system, the water pump in the whole system starts and stops frequently or does not start normally, resulting in a shortened service life (damage) of the water pump and other actuators in the system, or failure to use them normally.

[0005] 2. Due to the high pressure difference and high frequency of low peaks and valleys, the key components in the micro-pressure differential controller are directly subjected to high-frequency impact in a short period of time, which significantly shortens the service life of the micro-pressure differential controller. Utility Model Content

[0006] The purpose of the utility model is to provide a vibration-absorbing micro-pressure difference switch to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a shock-absorbing type micro-differential pressure switch, comprising a signal end protective mounting plastic shell and a pressure chamber low-pressure end shell, the pressure chamber low-pressure end shell is fixed to the lower end of the signal end protective mounting plastic shell by bolts, a sheathed wire cable is fixedly arranged on one side of the signal end protective mounting plastic shell, a wiring terminal is fixedly arranged on one side of the sheathed wire cable, a shock-absorbing mechanism is arranged between the signal end protective mounting plastic shell and the pressure chamber low-pressure end shell, the shock-absorbing mechanism comprises a spherical thread base sleeve, a first magnetic steel, a ball head thread A transmission idle rod, a shock-absorbing spring adjustment seat, a shock-absorbing spring, a spherical button and a button reset spring. The spherical threaded base sleeve is embedded and fixed between the signal end protective mounting plastic shell and the inside of the pressure chamber low-pressure end shell. The first magnetic steel is arranged at the bottom end of the spherical threaded base sleeve. A ball-head threaded transmission idle rod is slidably arranged on the top of the first magnetic steel. The shock-absorbing spring adjustment seat is installed around the outside of the ball-head threaded transmission idle rod. The shock-absorbing spring is installed on the top of the shock-absorbing spring adjustment seat. The spherical button is installed on the top of the spherical threaded base sleeve. The button reset spring is installed on the top of the spherical button.

[0008] Preferably, the signal end protective mounting plastic housing further comprises a micro switch, a switch seat, a switch fine-tuning nut and a switch fine-tuning screw, the micro switch is mounted inside the signal end protective mounting plastic housing, the switch seat is mounted on one side of the micro switch, the switch fine-tuning screw is mounted on the switch seat, and the switch fine-tuning nut is sleeved on the outside of the switch fine-tuning screw.

[0009] Preferably, the pressure chamber low-pressure end shell also includes a low-pressure medium input interface, a high-pressure medium input interface, a pressure differential diaphragm, a magnetic steel nylon seat, a diaphragm return spring, a return spring adjustment gasket and a second magnetic steel. The low-pressure medium input interface is arranged at the top of the pressure chamber low-pressure end shell, and the high-pressure medium input interface is arranged at the lower end of the pressure chamber low-pressure end shell. The pressure differential diaphragm is installed inside the pressure chamber low-pressure end shell, the magnetic steel nylon seat is installed at the top position of the pressure differential diaphragm, the return spring adjustment gasket is installed on the outside of the upper end of the magnetic steel nylon seat, the diaphragm return spring is installed at the top position of the return spring adjustment gasket, the top of the diaphragm return spring is tightly attached to the top position inside the pressure chamber low-pressure end shell, and the second magnetic steel is installed at the top position of the magnetic steel nylon seat.

[0010] Preferably, the lower end of the spherical thread base sleeve is sleeved on the outside of the shock-absorbing compression spring.

[0011] Preferably, the top end of the button reset compression spring is tightly attached to the lower end of the micro switch.

[0012] Preferably, the lower end of the first magnetic steel and the top end of the second magnetic steel have the same magnetic pole.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The low and high pressure media of the utility model enter the high and low pressure chambers formed by the isolation of the pressure differential diaphragm inside the low pressure end shell of the pressure chamber through the low pressure medium input interface and the high pressure medium input interface respectively, and a pressure difference is formed on the high and low sides of the pressure differential diaphragm, overcoming the preload force of the diaphragm reset compression spring, pushing the second magnetic steel to move up and down, thereby utilizing the repulsive force to push the first magnetic steel in the spherical thread base sleeve to move up and down, and then directly pushing the ball head thread transmission idler rod to move up and down, forcing the shock-absorbing compression spring to deform and push the spherical button to move up and down, and in the working process, the ball head thread transmission idler rod does not directly push the spherical button in this process, and the shock-absorbing compression spring needs to overcome the preload force of the shock-absorbing compression spring to deform, and the spherical button is pushed, and a period of time is required in the process of overcoming the preload force of the shock-absorbing compression spring, so it plays a role in eliminating pressure difference fluctuations in the time process; the spherical button pushes the micro switch to switch, and outputs a stable pressure difference switching signal to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a vibration-absorbing micro-pressure differential switch of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a vibration-absorbing mechanism of a vibration-absorbing micro-pressure differential switch of the utility model;

[0017] Figure 3 The utility model is a top view of the low-pressure end shell of the pressure chamber of a shock-absorbing micro-pressure differential switch.

[0018] In the figure: 1. Signal end protective mounting plastic housing; 2. Sheathed conductor cable; 3. Wiring terminal; 4. Pressure chamber low-pressure end housing; 5. Diaphragm reset spring; 6. Magnetic steel nylon seat; 7. High-pressure medium input interface; 8. Pressure difference diaphragm; 9. Reset spring adjustment gasket; 10. First magnetic steel; 11. Second magnetic steel; 12. Button reset spring; 13. Switch seat; 14. Switch fine-tuning nut; 15. Switch fine-tuning screw; 16. Micro switch; 17. Spherical button; 18. Spherical thread base sleeve; 19. Shock-absorbing spring; 20. Shock-absorbing spring adjustment seat; 21. Ball head thread transmission idler rod; 22. Low-pressure medium input interface. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-3The utility model provides a shock-absorbing type micro-pressure differential switch, including a signal end protection installation plastic shell 1 and a pressure chamber low-pressure end shell 4, the pressure chamber low-pressure end shell 4 is fixed to the lower end of the signal end protection installation plastic shell 1 by bolts, a sheathed wire cable 2 is fixed on one side of the signal end protection installation plastic shell 1, and a wiring terminal 3 is fixed on one side of the sheathed wire cable 2. A shock-absorbing mechanism is arranged between the signal end protection installation plastic shell 1 and the pressure chamber low-pressure end shell 4, and the shock-absorbing mechanism includes a spherical thread base sleeve 18, a first magnetic steel 10, a ball head thread transmission idle rod 21, a shock-absorbing compression spring adjustment seat 20, a shock-absorbing compression spring 19, and a spherical button 17. and a button reset compression spring 12, a spherical thread base sleeve 18 is embedded and fixed between the signal end protective mounting plastic shell 1 and the inside of the pressure chamber low-pressure end shell 4, the first magnetic steel 10 is placed at the bottom end of the spherical thread base sleeve 18, and a ball head thread transmission idle rod 21 is slidably provided on the top of the first magnetic steel 10, the shock-absorbing compression spring adjustment seat 20 is surrounded and installed on the outside of the ball head thread transmission idle rod 21, the shock-absorbing compression spring 19 is installed on the top of the shock-absorbing compression spring adjustment seat 20, the spherical button 17 is installed on the top of the spherical thread base sleeve 18, the lower end of the spherical thread base sleeve 18 is sleeved on the outside of the shock-absorbing compression spring 19, and the button reset compression spring 12 is installed on the top of the spherical button 17.

[0021] The signal end protection mounting plastic housing 1 also includes a micro switch 16, a switch seat 13, a switch fine-tuning nut 14 and a switch fine-tuning screw 15. The micro switch 16 is installed inside the signal end protection mounting plastic housing 1, the switch seat 13 is installed on one side of the micro switch 16, the switch fine-tuning screw 15 is installed on the switch seat 13, the switch fine-tuning nut 14 is sleeved on the outside of the switch fine-tuning screw 15, and the top of the button reset compression spring 12 is tightly attached to the lower end of the micro switch 16.

[0022] The pressure chamber low-pressure end housing 4 also includes a low-pressure medium input interface 22, a high-pressure medium input interface 7, a pressure differential diaphragm 8, a magnetic steel nylon seat 6, a diaphragm return spring 5, a return spring adjustment gasket 9 and a second magnetic steel 11. The low-pressure medium input interface 22 is at the top of the pressure chamber low-pressure end housing 4, the high-pressure medium input interface 7 is at the lower end of the pressure chamber low-pressure end housing 4, the pressure differential diaphragm 8 is installed inside the pressure chamber low-pressure end housing 4, the magnetic steel nylon seat 6 is installed at the top position of the pressure differential diaphragm 8, the return spring adjustment gasket 9 is installed on the outer side of the upper end of the magnetic steel nylon seat 6, the diaphragm return spring 5 is installed at the top position of the return spring adjustment gasket 9, the top of the diaphragm return spring 5 is tightly attached to the top position inside the pressure chamber low-pressure end housing 4, the second magnetic steel 11 is installed at the top position of the magnetic steel nylon seat 6, and the lower end of the first magnetic steel 10 and the top of the second magnetic steel 11 are the same magnetic pole.

[0023] Working principle: When in use, low and high pressure media enter the high and low pressure chambers respectively through the low pressure medium input interface 22 and the high pressure medium input interface 7, which are isolated by the pressure differential diaphragm 8 inside the low pressure end housing 4 of the pressure chamber. A pressure difference is formed on the high and low sides of the pressure differential diaphragm 8, overcoming the preload of the diaphragm reset spring 5, pushing the second magnetic steel 10 up and down, thereby using the repulsive force to push the first magnetic steel 10 in the spherical thread base sleeve 18 up and down, and then directly pushing the ball head thread transmission idle rod 21 up and down, forcing the shock absorbing pressure The spring 19 is deformed to push the spherical button 17 up and down, and in the working process, the ball head threaded transmission idle rod 21 does not directly push the spherical button 17, but needs the shock-absorbing compression spring 19 to overcome the preload force of the shock-absorbing compression spring 19 to deform. It takes a period of time to push the spherical button 17 in the process of overcoming the preload force of the shock-absorbing compression spring 19, so it plays a role in eliminating pressure difference fluctuations over time; the spherical button 17 pushes the micro switch 16 to switch, and outputs a stable pressure difference switching signal to the outside.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibration-absorbing micro differential pressure switch, comprising a signal end protective mounting plastic housing (1) and a pressure chamber low-pressure end housing (4), characterized in that: The pressure chamber low-pressure end housing (4) is fixed to the lower end of the signal end protective installation plastic housing (1) by bolts; a sheathed wire cable (2) is fixedly arranged on one side of the signal end protective installation plastic housing (1); a wiring terminal (3) is fixedly arranged on one side of the sheathed wire cable (2); a shock absorbing mechanism is arranged between the signal end protective installation plastic housing (1) and the pressure chamber low-pressure end housing (4); the shock absorbing mechanism comprises a spherical thread base sleeve (18), a first magnetic steel (10), a ball head thread transmission idle rod (21), a shock absorbing compression spring adjustment seat (20), a shock absorbing compression spring (19), a spherical button (17) and a button reset compression spring (12); The spherical thread base sleeve (18) is embedded and fixed between the signal end protective installation plastic shell (1) and the inner part of the pressure chamber low-pressure end shell (4); the first magnetic steel (10) is arranged at the inner bottom end of the spherical thread base sleeve (18); a ball head thread transmission idle rod (21) is slidably arranged at the top end of the first magnetic steel (10); the shock-absorbing compression spring adjustment seat (20) is installed around the outer side of the ball head thread transmission idle rod (21); the shock-absorbing compression spring (19) is installed at the top end of the shock-absorbing compression spring adjustment seat (20); the spherical button (17) is installed at the top end of the spherical thread base sleeve (18); and the button reset compression spring (12) is installed at the top end of the spherical button (17).

2. A vibration-absorbing micro-pressure differential switch according to claim 1, characterized in that: The signal end protection installation plastic housing (1) further comprises a micro switch (16), a switch seat (13), a switch fine-tuning nut (14) and a switch fine-tuning screw (15); the micro switch (16) is installed inside the signal end protection installation plastic housing (1), the switch seat (13) is installed on one side of the micro switch (16), the switch fine-tuning screw (15) is installed on the switch seat (13), and the switch fine-tuning nut (14) is sleeved on the outside of the switch fine-tuning screw (15).

3. A vibration-absorbing micro-pressure differential switch according to claim 2, characterized in that: The pressure chamber low-pressure end housing (4) further comprises a low-pressure medium input interface (22), a high-pressure medium input interface (7), a pressure differential diaphragm (8), a magnetic steel nylon seat (6), a diaphragm return spring (5), a return spring adjustment gasket (9) and a second magnetic steel (11), wherein the low-pressure medium input interface (22) is arranged at the top of the pressure chamber low-pressure end housing (4), the high-pressure medium input interface (7) is arranged at the bottom of the pressure chamber low-pressure end housing (4), the pressure differential diaphragm (8) is installed inside the pressure chamber low-pressure end housing (4), the magnetic steel nylon seat (6) is installed at the top position of the pressure differential diaphragm (8), the return spring adjustment gasket (9) is installed on the outer side of the upper end of the magnetic steel nylon seat (6), the diaphragm return spring (5) is installed at the top position of the return spring adjustment gasket (9), the top of the diaphragm return spring (5) is tightly attached to the top position inside the pressure chamber low-pressure end housing (4), and the second magnetic steel (11) is installed at the top position of the magnetic steel nylon seat (6).

4. A vibration-absorbing micro-pressure differential switch according to claim 3, characterized in that: The lower end of the spherical thread base sleeve (18) is sleeved on the outside of the shock-absorbing compression spring (19).

5. The vibration-absorbing micro-pressure differential switch according to claim 4, characterized in that: The top end of the button reset compression spring (12) is tightly attached to the lower end of the micro switch (16).

6. The vibration-absorbing micro-differential pressure switch according to claim 5, characterized in that: The lower end of the first magnetic steel (10) and the top end of the second magnetic steel (11) have the same magnetic pole.

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