Mechanical explosion-proof pressure controller

Abstract

The utility model discloses a mechanical explosion-proof pressure controller, which comprises a meter shell, a meter cover is arranged on the meter shell, a measuring mechanism and a control mechanism are arranged in the meter shell, the measuring mechanism comprises a joint connected with a pressure source, a spring tube is arranged on the joint, and the spring tube is connected with the pressure source. The control mechanism comprises a microswitch, the free end of the bourdon tube is in contact with the microswitch, the microswitch is connected with a wiring terminal, due to the arrangement of the bourdon tube, the microswitch and the wiring terminal which are used for mechanical detection, when the pressure of a detected medium acts on the bourdon tube, the free end of the bourdon tube generates displacement, and the microswitch is connected with the wiring terminal. Therefore, the relative position between the free end of the spring tube and the contact of the microswitch is changed, the contact of the microswitch is connected or disconnected, control at a set value is achieved, and the pressure controller is of a mechanical structure, does not need a power supply and is high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field supporting equipment, in particular to a mechanical explosion-proof pressure controller. Background Art

[0002] The ground BOP control device is an important device for controlling the wellhead BOP group, hydraulic throttle valve and well-killing valve in oil fields. It is an indispensable device for preventing blowouts in drilling and well repair operations. In oil field operations, there may be an environment with explosive mixtures. In this case, the start and stop of the motor requires a pressure controller, which can be used in the environment where explosive mixtures may appear in oil field operations, and can control the motor according to the pressure in the device.

[0003] The pressure controller used in the existing device is an electronic structure. Not only does it need to provide power on site, it is inconvenient to use. The harsh environment on site makes the electronic pressure controller easy to be damaged and has poor reliability. Utility Model Content

[0004] In view of the above defects or shortcomings, the purpose of the present utility model is to provide a mechanical explosion-proof pressure controller.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A mechanical explosion-proof pressure controller comprises: a case, a cover is installed on the case, a measuring mechanism and a control mechanism are installed in the case, wherein the measuring mechanism comprises: a joint connected to a pressure source, a spring tube is installed on the joint, and the spring tube; the control mechanism comprises: a micro switch, the free end of the spring tube is in contact with the micro switch, and the micro switch is connected to a terminal.

[0007] A fixing frame and a mounting plate are installed in the watch case, the micro switch is installed on the fixing frame, a wiring board is installed on the mounting plate, and the wiring board is connected to the wiring terminal for transmitting the switching signal of the micro switch.

[0008] The joint is connected to a pressure source, and an inner hole of the joint is communicated with a spring tube.

[0009] The joint is installed in the watch case through a connecting nut.

[0010] An explosion-proof cable stuffing box is installed on the casing to connect and lock the user cable with the wiring board.

[0011] The switch output connector is filled with an explosion-proof cable stuffing box.

[0012] A set value adjustment opening is provided on one side of the watch case, and a plug is connected to the set value adjustment opening.

[0013] A second O-ring is installed between the plug and the watch case.

[0014] The watch cover is fixed to the watch case by screws, and a first O-type sealing ring is installed between the watch case and the watch cover.

[0015] One end of the wiring terminal is connected to the micro switch through a wire, and the other end of the wiring terminal is fixed on the wiring board.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model provides a mechanical explosion-proof pressure controller. Since a spring tube, a micro switch and a wiring terminal are provided for mechanical detection, when the pressure of the measured medium acts on the spring tube, the free end of the spring tube is displaced, thereby changing the relative position between the free end of the spring tube and the contact of the micro switch, causing the contact of the micro switch to be connected or disconnected, so as to achieve control at a set value. The pressure controller is a mechanical structure, does not need to provide power supply, and has high reliability. The pressure controller uses a micro switch to output the switching value, and the contact capacity is large, so that the device is easy to use and accurate.

[0018] Furthermore, the utility model adopts a micro switch with adjustable switching difference, and one switch can control two set points. The set points can be adjusted outside the case without opening the cover, which is convenient and quick to use. In addition, the explosion-proof case allows the controller to be used in places with explosion hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model mechanical explosion-proof pressure controller;

[0020] Figure 2 This is a schematic diagram of the general assembly of the utility model mechanical explosion-proof pressure controller;

[0021] Figure 3 This is the general assembly side view of the utility model mechanical explosion-proof pressure controller;

[0022] Figure 4 This is a schematic diagram of the case of the mechanical explosion-proof pressure controller of the utility model;

[0023] Figure 5 It is a side view of the cover of the mechanical explosion-proof pressure controller of the utility model.

[0024] In the figure, 1 is a case; 2 is a cover; 3 is a spring tube; 4 is a fixing frame; 5 is a wire; 6 is a terminal; 7 is a micro switch; 8 is a terminal block; 9 is a mounting plate; 10 is a connector; 11 is a screw; 12 is a first O-ring; 13 is a second O-ring; 14 is a measuring mechanism; 15 is a plug; 16 is a connecting nut; 17 is an explosion-proof cable stuffing box. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0026] like Figure 1-5 As shown, the utility model provides a mechanical explosion-proof pressure controller, comprising: a case 1, a cover 2 is installed on the case 1, a measuring mechanism 14 and a control mechanism are installed in the case 1, wherein the measuring mechanism comprises: a connector 10 connected to a pressure source, a spring tube 3 is installed on the connector 10, and the spring tube 3; the control mechanism comprises: a micro switch 7, the free end of the spring tube 3 is in contact with the micro switch 7, the micro switch 7 is connected to a terminal 6, one end of the terminal 6 is connected to the micro switch 7 through a wire 5, and the terminal 6 is fixed on a wiring board 8.

[0027] Specifically, a fixing frame 4 and a mounting plate 9 are installed in the watch case 1, the micro switch 7 is installed on the fixing frame 4, a wiring board 8 is installed on the mounting plate 9, and the wiring board 8 is connected to the wiring terminal 6 for transmitting the switch signal of the micro switch 7.

[0028] Furthermore, the connector 10 is connected to the pressure source, and the inner hole of the connector 10 is connected to the spring tube 3. The connector 10 is installed in the case 1 through the connecting nut 16. In addition, in order to stabilize the output signal, an explosion-proof cable stuffing box 17 is installed on the case 1, which is used to connect and lock the user cable to the terminal block 8. The explosion-proof cable stuffing box 17 is filled with filler to fix the cable and seal.

[0029] Further preferably, a set value adjustment opening is provided on one side of the watch case 1, and a plug 15 is connected to the set value adjustment opening, so that a second O-ring 13 is installed between the plug 15 and the watch case 1; the watch cover 2 is fixed to the watch case 1 by screws, and a first O-ring 12 is installed between the watch case 1 and the watch cover 2.

[0030] The wiring terminal 6 is connected to the micro switch 7 through a wire, and the wiring terminal 6 is fixed on the wiring board 8.

[0031] The utility model outputs two sets of switch values ​​according to the pressure. When the pressure value is higher than the set pressure value, the controller outputs a switch value to stop the motor in the system, and then the pressure value in the system drops. When the pressure drops to a certain set value, the controller outputs another switch value to start the motor in the system and start working. It has the advantages of no need for power supply, simple structure, adjustable set point, good stability, explosion-proof shell, etc.

[0032] Principle of the utility model:

[0033] The housing 1 has a flameproof function. The measurement control system is mainly composed of a spring tube 3, a micro switch 7 and a terminal 6. When the pressure of the measured medium acts on the spring tube 3, the free end of the spring tube 3 is displaced, thereby changing the relative position between the free end of the spring tube 3 and the contact of the micro switch 7, causing the contact of the micro switch 7 to be connected or disconnected, so as to achieve control at the set value.

[0034] In the utility model, the shell is of explosion-proof type, and the explosion-proof mark is: Ex dbⅡB T4 Gb.

[0035] The case 1 and the cover 2 are designed mainly with reference to the requirements of GB / T 3836.1-2021 and GB / T 3836.2-2021 standards. The measuring system uses a spring tube 3 as an elastic element, one end of which is welded to the joint 10 by argon arc welding, and the other end is sealed by argon arc welding.

[0036] When the measuring medium enters the spring tube 3 through the joint 10, the free end of the spring tube 3 is displaced, changing the relative position with the contact of the micro switch 7, thereby causing the contact to be connected or disconnected.

[0037] The micro switch 7 of the controller controls two set points, wherein one set point is controlled when the voltage is increased, and the other set point is controlled when the voltage is decreased by adjusting the switching difference of the micro switch 7 .

[0038] Features of this utility model:

[0039] 1) With explosion-proof housing, the controller can be used in places with explosion hazard.

[0040] 2) The pressure controller is a mechanical structure, does not require power supply, and has high reliability.

[0041] 3) The pressure controller uses a micro switch to output the switching value, and the contact capacity is large.

[0042] 4) Using a micro switch with adjustable switching difference, one switch can control two set points.

[0043] 5) The set point can be adjusted from the outside of the case without opening the cover, making it easy and quick to use.

[0044] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred schemes of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still reflect the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A mechanical explosion-proof pressure controller, characterized in that: include: A watch case (1), a watch cover (2) is mounted on the watch case (1), a measuring mechanism (14) and a control mechanism are mounted inside the watch case (1), wherein the measuring mechanism comprises: a joint (10) connected to a pressure source, a spring tube (3) is mounted on the joint (10), and the spring tube (3); the control mechanism comprises: a micro switch (7), the free end of the spring tube (3) is in contact with the micro switch (7), and the micro switch (7) is connected to a terminal (6).

2. The mechanical explosion-proof pressure controller according to claim 1 is characterized in that: A fixing frame (4) and a mounting plate (9) are installed in the watch case (1); the micro switch (7) is installed on the fixing frame (4); a wiring board (8) is installed on the mounting plate (9); the wiring board (8) is connected to the wiring terminal (6) and is used for switching signal transmission of the micro switch (7).

3. The mechanical explosion-proof pressure controller according to claim 1 or 2, characterized in that: The joint (10) is connected to a pressure source, and the inner hole of the joint (10) is in communication with the spring tube (3).

4. The mechanical explosion-proof pressure controller according to claim 3 is characterized in that: The joint (10) is installed in the watch case (1) via a connecting nut (16).

5. The mechanical explosion-proof pressure controller according to claim 1 or 2, characterized in that: The meter housing (1) is provided with an explosion-proof cable stuffing box (17) for connecting and locking the user cable and the wiring board (8).

6. The mechanical explosion-proof pressure controller according to claim 5, characterized in that: The explosion-proof cable stuffing box (17) is filled with stuffing for fixed sealing.

7. The mechanical explosion-proof pressure controller according to claim 1 or 2, characterized in that: A set value adjustment opening is provided on one side of the watch case (1), and a plug (15) is connected to the set value adjustment opening.

8. The mechanical explosion-proof pressure controller according to claim 7, characterized in that: A second O-type sealing ring (13) is installed between the plug (15) and the watch case (1).

9. The mechanical explosion-proof pressure controller according to claim 1, characterized in that: The watch cover (2) is fixedly mounted on the watch case (1) by means of screws, and a first O-type sealing ring (12) is mounted between the watch case (1) and the watch cover (2).

10. The mechanical explosion-proof pressure controller according to claim 1, characterized in that: One end of the wiring terminal (6) is connected to the micro switch (7) via a wire, and the other end of the wiring terminal (6) is fixed on a wiring board (8).

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