High-purity switching value pressure transmitter

Abstract

The utility model discloses a high-purity switching value pressure transmitter, which relates to the technical field of pressure transmitters and comprises a base and a mounting hole. When the high-purity switching value pressure transmitter is used, the lower end of a shell is matched with a lower seal at the root of a plug through a boss to form a waterproof seal, the upper end of the shell is matched with an upper seal at the root of a controller to form a waterproof seal, and in addition, a circuit board is fixed on the inner side of a mounting rib at the middle end of the shell through a screw. The circuit board and the wire harness are sealed and wrapped by polyurethane, waterproof protection is carried out on the circuit board to the maximum extent, normal operation of signal transmission work is guaranteed, in addition, positioning lap joint of the pressure sensitive element is achieved through hook bodies on the two sides of the plastic positioning piece and two hook connecting grooves in the circumference of the containing groove, and the pressure sensitive element is prevented from being damaged. The contact area of the hard gasket and the upper end face of the plug is larger than the contact area of the pressure sensitive element and the upper end face of the plug when the hard gasket is not arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure transmitters, in particular to a high-purity switching pressure transmitter. Background Art

[0002] With the development of industrial automation and intelligence, in the semiconductor field, the market not only needs traditional analog continuous output pressure transmitters, but also has a certain demand for switch pressure transmitters. Pressure transmitter refers to a pressure sensor with output as a standard signal. It is an instrument that accepts pressure variables and converts them into standard output signals in proportion.

[0003] The pressure transmitter is mainly composed of three parts: pressure measuring element sensor, measuring circuit and process connection. During the working process of the pressure transmitter, the electronic control is an important part. When the electronic control is defective, it will directly affect the normal operation of the pressure transmitter. In order to ensure the normal operation of the signal transmission, it is particularly important to protect the circuit board in the pressure measuring diaphragm box. However, the waterproof sealing measures of the circuit board placed in the outer shell in the prior art are not perfect. Liquid can easily enter the outer shell through the joints, causing damage to the circuit board. In addition, the range of the traditional analog output pressure transmitter is set before leaving the factory and cannot be adjusted during use. At the same time, the external display does not have the function of data adjustment and can only display data, which is insufficient in functionality.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a high-purity switch pressure transmitter is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a high-purity switch quantity pressure transmitter to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-purity switch pressure transmitter, comprising a base and a mounting hole, the base is provided with mounting holes around it, and a plug is fixedly installed in the middle of the base, a lower seal is sleeved on the root of the plug, and a lower thread is provided at the bottom end of the plug, an inwardly recessed placement groove is provided on the top of the plug, and two hook grooves are provided on the circumference of the placement groove.

[0007] Furthermore, a hard gasket is laid inside the placement groove, and a pressure sensitive element is attached to the top of the hard gasket.

[0008] Furthermore, the contact area between the hard washer and the upper end surface of the plug is larger than the contact area between the pressure sensitive element and the upper end surface of the plug when no hard washer is provided.

[0009] Furthermore, a plastic positioning piece is clamped on the top of the pressure sensitive element, and two hooks are extended around the circumference of the plastic positioning piece, and the hooks are buckled and connected with the hook grooves.

[0010] Furthermore, a shell is threadedly connected above the plug, and a boss is fixed at the bottom end of the shell, and the boss cooperates with the lower seal to achieve a waterproof seal.

[0011] Furthermore, a mounting rib is fixed at the middle end of the inner part of the shell, and a circuit board is fixed to the inner side of the mounting rib by screws.

[0012] Furthermore, wire harnesses extend from the upper and lower ends of the circuit board, and the circuit board and the wire harnesses are sealed and wrapped with polyurethane.

[0013] Furthermore, a controller is connected to the upper part of the shell, and the controller is fixed to the upper thread of the shell through an upper thread.

[0014] Furthermore, an upper seal is mounted on the base of the controller, and the upper seal cooperates with the upper opening of the housing to achieve a waterproof seal.

[0015] Furthermore, a display screen is provided on the right side of the top of the controller, and an output interface is provided on the left side of the top of the controller.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. Compared with the traditional pressure transmitter with analog continuous output, the utility model not only adds two switching outputs, namely two PNP or NPN outputs, on the basis of the traditional 4-20mA current output, but also integrates the controller into the pressure transmitter, which can not only display the relevant data, but also adjust the data. The pressure control value of the two PNP or NPN outputs is adjustable and can be adjusted through the display screen and the corresponding buttons. In addition, all products are equipped with c-seal and w-seal related process connections, and the measuring parts meet the EP level requirements. Finally, the application also retains the 4-20mA current output, so that the switching quantity and continuous quantity can be used at the same time, and the output form is a 5-wire system: 1 line is the positive power supply, 2 lines are the negative power supply, 3 lines are the switch 1 output, 4 lines are the switch 2 output, and 5 lines are the 4-20mA output.

[0018] 2. When the utility model is in use, the lower end of the shell cooperates with the lower seal at the root of the plug through the boss to form a waterproof seal, and the upper end of the shell cooperates with the upper seal at the root of the controller to form a waterproof seal. In addition, the circuit board is fixed to the inner side of the mounting rib at the middle end of the shell by screws, and the circuit board and the wiring harness are wrapped with polyurethane seals, which provide waterproof protection for the circuit board to the greatest extent and ensure the normal operation of signal transmission. In addition, the pressure sensitive element is positioned and overlapped by the hooks on both sides of the plastic positioning piece and the two connecting hook grooves on the circumference of the placement groove. The contact area between the hard gasket and the upper end face of the plug is greater than the contact area between the pressure sensitive element and the upper end face of the plug when no hard gasket is provided. By increasing the contact area between the pressure sensitive element and the upper end face of the plug, the working pressure is reduced, thereby reducing the precision error caused by the deformation of the pressure sensitive element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall combined structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall explosion structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the shell of the utility model.

[0022] In the figure: 1. base; 2. mounting hole; 3. plug; 4. lower seal; 5. lower thread; 6. placement groove; 7. hook groove; 8. hard gasket; 9. pressure sensitive element; 10. plastic positioning part; 11. hook body; 12. shell; 13. boss; 14. mounting rib; 15. circuit board; 16. wiring harness; 17. polyurethane seal; 18. controller; 19. upper thread; 20. upper seal; 21. display screen; 22. output interface. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0024] like Figure 1 to Figure 2As shown, a high-purity switch pressure transmitter includes a base 1 and a mounting hole 2. The base 1 is provided with mounting holes 2 around it, and a plug 3 is fixedly installed in the middle of the base 1. The root of the plug 3 is provided with a lower seal 4, and the bottom of the plug 3 is provided with a lower thread 5. The top of the plug 3 is provided with an inwardly recessed placement groove 6, and the placement groove 6 is provided with two hooking grooves 7 at the circumference. A hard gasket 8 is laid inside the placement groove 6, and a pressure sensitive element 9 is attached to the top of the hard gasket 8. The contact area between the hard gasket 8 and the upper end surface of the plug 3 is greater than the contact area between the pressure sensitive element 9 and the upper end surface of the plug 3 when the hard gasket 8 is not provided. The pressure sensitive A plastic positioning piece 10 is engaged with the top of the pressure sensing element 9, and two hooks 11 are extended around the circumference of the plastic positioning piece 10, and the hooks 11 are buckled with the hook grooves 7. The pressure sensitive element 9 is positioned and overlapped with the two hook grooves 7 around the circumference of the placement groove 6 through the hooks 11 on both sides of the plastic positioning piece 10. The contact area between the hard washer 8 and the upper end surface of the plug 3 is greater than the contact area between the pressure sensitive element 9 and the upper end surface of the plug 3 when the hard washer 8 is not provided. By increasing the contact area between the pressure sensitive element 9 and the upper end surface of the plug 3, the working pressure is reduced, thereby reducing the precision error caused by the deformation of the pressure sensitive element 9;

[0025] like Figures 1 to 3 As shown, a shell 12 is threadedly connected above the plug 3, and a boss 13 is fixed at the bottom end of the shell 12, and the boss 13 cooperates with the lower seal 4 to achieve a waterproof seal, a mounting rib 14 is fixed at the middle end of the shell 12, and a circuit board 15 is fixed to the inner side of the mounting rib 14 by screws, and a wiring harness 16 extends from the upper and lower ends of the circuit board 15, and the circuit board 15 and the wiring harness 16 are wrapped by a polyurethane seal 17, the lower end of the shell 12 cooperates with the lower seal 4 at the root of the plug 3 through the boss 13 to form a waterproof seal, and the upper end of the shell 12 cooperates with the upper seal 20 at the root of the controller 18 to form a waterproof seal, in addition, the circuit board 15 is fixed to the inner side of the mounting rib 14 at the middle end of the shell 12 by screws, and the circuit board 15 and the wiring harness 16 are both wrapped by the polyurethane seal 17 , the circuit board 15 is waterproofed to the greatest extent to ensure the normal operation of the signal transmission. A controller 18 is connected to the top of the shell 12, and the controller 18 is fixed to the upper thread of the shell 12 through an upper thread 19. An upper seal 20 is mounted at the root of the controller 18, and the upper seal 20 cooperates with the upper opening of the shell 12 to achieve waterproof sealing. A display screen 21 is provided on the right side of the top of the controller 18, and an output interface 22 is provided on the left side of the top of the controller 18. The present application also integrates the controller 18 into the pressure transmitter, which can not only display relevant data, but also adjust the data. The pressure control value of the two-way PNP or NPN output is adjustable, which can be adjusted through the display screen 21 and the corresponding buttons, enriching the functionality of this product.

[0026] Working principle: When using this high-purity switch pressure transmitter, the lower end of the housing 12 cooperates with the lower seal 4 at the root of the plug 3 through the boss 13 to form a waterproof seal, and the upper end of the housing 12 cooperates with the upper seal 20 at the root of the controller 18 to form a waterproof seal. In addition, the circuit board 15 is fixed to the inner side of the mounting rib 14 at the middle end of the housing 12 by screws. The circuit board 15 and the wiring harness 16 are wrapped by the polyurethane seal 17 to provide waterproof protection for the circuit board 15 to the greatest extent, ensuring the normal operation of the signal transmission. In addition, the pressure sensitive element 9 is connected to the two places on the circumference of the placement groove 6 through the hooks 11 on both sides of the plastic positioning member 10. The hook groove 7 realizes positioning overlap, and the contact area between the hard gasket 8 and the upper end surface of the plug 3 is larger than the contact area between the pressure sensitive element 9 and the upper end surface of the plug 3 when the hard gasket 8 is not provided. By increasing the contact area between the pressure sensitive element 9 and the upper end surface of the plug 3, the working pressure is reduced, thereby reducing the accuracy error caused by the deformation of the pressure sensitive element 9. In addition, the present application also integrates the controller 18 into the pressure transmitter, which can not only display relevant data but also adjust the data. The pressure control values ​​of the two PNP or NPN outputs are adjustable and can be adjusted through the display screen 21 and the corresponding buttons, thereby enriching the functionality of this product.

[0027] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A high-purity switch pressure transmitter, characterized in that: The utility model comprises a base (1) and a mounting hole (2), wherein the base (1) is provided with the mounting hole (2) on its periphery, and a plug (3) is fixedly installed in the middle of the base (1), a lower seal (4) is sleeved on the root of the plug (3), and a lower thread (5) is provided at the bottom end of the plug (3), and an inwardly recessed placement groove (6) is provided at the top of the plug (3), and two hooking grooves (7) are provided on the circumference of the placement groove (6).

2. A high-purity switch pressure transmitter according to claim 1, characterized in that: A hard washer (8) is laid inside the placement groove (6), and a pressure sensitive element (9) is attached to the top of the hard washer (8).

3. A high-purity switch pressure transmitter according to claim 2, characterized in that: The contact area between the hard washer (8) and the upper end surface of the plug (3) is greater than the contact area between the pressure sensitive element (9) and the upper end surface of the plug (3) when the hard washer (8) is not provided.

4. A high-purity switch pressure transmitter according to claim 2, characterized in that: A plastic positioning piece (10) is clamped on the top of the pressure sensitive element (9), and two hooks (11) are extended around the circumference of the plastic positioning piece (10), and the hooks (11) are buckled and connected with the hook grooves (7).

5. A high-purity switch pressure transmitter according to claim 1, characterized in that: The plug (3) is threadedly connected to a housing (12) above, and a boss (13) is fixed to the bottom end of the housing (12), and the boss (13) cooperates with the lower seal (4) to achieve waterproof sealing.

6. A high-purity switch pressure transmitter according to claim 5, characterized in that: A mounting rib (14) is fixed to the middle end of the inner part of the housing (12), and a circuit board (15) is fixed to the inner side of the mounting rib (14) by means of screws.

7. A high-purity switch pressure transmitter according to claim 6, characterized in that: A wiring harness (16) extends from the upper and lower ends of the circuit board (15), and the circuit board (15) and the wiring harness (16) are wrapped by a polyurethane seal (17).

8. The high-purity switch pressure transmitter according to claim 5, characterized in that: A controller (18) is connected to the upper part of the housing (12), and the controller (18) is fixed to the upper thread of the housing (12) via an upper thread (19).

9. A high-purity switch pressure transmitter according to claim 8, characterized in that: The controller (18) is sleeved with an upper seal (20) at the base thereof, and the upper seal (20) cooperates with the upper opening of the housing (12) to achieve waterproof sealing.

10. A high-purity switch pressure transmitter according to claim 8, characterized in that: A display screen (21) is provided on the right side of the top of the controller (18), and an output interface (22) is provided on the left side of the top of the controller (18).

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