Diaphragm type differential pressure switch of mud system

Abstract

The invention provides a diaphragm type differential pressure switch for a mud system. The diaphragm type differential pressure switch for the mud system comprises a high-pressure end, a low-pressure end and a trigger structure, the high-pressure end further comprises a first flange and a first diaphragm, the first diaphragm is connected with one end of a first capillary tube, the low-pressure end further comprises a second flange and a second diaphragm, the second diaphragm is arranged in the center of the second flange, and the second diaphragm is connected with one end of a second capillary tube; and the trigger structure is connected with the other end of the first capillary tube and the other end of the second capillary tube, so that the trigger structure triggers a signal according to the pressure difference between the high-pressure end and the low-pressure end. The first capillary tube and the second capillary tube are used for changing the mode that a structure is directly triggered to make contact with mud in the prior art through the pressure transmission medium, and the technical problem that a mud system differential pressure switch cannot be easily blocked by silt in the prior art is solved.

Description

Technical Field:

[0001] The present invention relates to the field of differential pressure switch structure design, and particularly to a diaphragm differential pressure switch for a mud system. Background Art:

[0002] Existing differential pressure switches are usually connected to both ends of pipelines, filters, etc. through copper pipes. The medium contacts the differential pressure switch to measure the pressure difference value, and is applicable to media such as water and oil. However, if used in a mud system, after a period of use, the mud will solidify in the copper pipe, resulting in blockage and inability to continue use.

[0003] Therefore, there is an urgent need for a diaphragm differential pressure switch for a mud system, which helps to solve the technical problem in the prior art that there is a lack of a technology to prevent the differential pressure switch in the mud system from being easily blocked by sediment. Summary of the Invention:

[0004] In one embodiment, the present invention provides a diaphragm differential pressure switch for a mud system, which changes the way of directly triggering the structure to contact the mud in the prior art by using a pressure transmission medium through a first capillary and a second capillary, and helps to solve the technical problem in the prior art that there is a lack of a technology to prevent the differential pressure switch in the mud system from being easily blocked by sediment.

[0005] The diaphragm differential pressure switch for the mud system includes a high-pressure end, a low-pressure end, and a triggering structure;

[0006] The high-pressure end further includes a first flange and a first diaphragm. The first diaphragm is arranged at the center of the first flange, and one end of a first capillary is connected to the first diaphragm and filled with a pressure transmission medium;

[0007] The low-pressure end further includes a second flange and a second diaphragm. The second diaphragm is arranged at the center of the second flange, and one end of a second capillary is connected to the second diaphragm and filled with the pressure transmission medium;

[0008] The triggering structure is respectively connected to the other end of the first capillary and the other end of the second capillary, so that the triggering structure triggers a signal according to the pressure difference between the high-pressure end and the low-pressure end.

[0009] In one embodiment, the triggering structure includes a housing, a bellows, and a differential pressure sensor;

[0010] The housing has an internal cavity;

[0011] The bellows is arranged inside the internal cavity. The bottom and top of the bellows are respectively connected to the bottom and top of the housing. The first capillary is communicated with the inside of the bellows, and the second capillary is communicated with the internal cavity outside the bellows;

[0012] The differential pressure sensor is disposed in the internal space and connected to the bellows, so that the trigger rod of the differential pressure sensor touches the trigger device, and finally triggers the trigger signal.

[0013] In one embodiment, the trigger device includes a housing and a lever;

[0014] The lever is disposed on a fulcrum inside the housing. The first end of the lever has a contact, and the second end of the lever is pressed by a compression spring. After the trigger rod is lifted, the pressure of the compression spring is overcome to disconnect the contact.

[0015] In one embodiment, a compression spring post is provided on the second end;

[0016] An adjusting bolt is provided on the housing, and both ends of the compression spring are sleeved on the compression spring post and the adjusting bolt respectively.

[0017] In one embodiment, the first capillary tube and the second capillary tube are sleeved with a protective tube.

[0018] In one embodiment, the housing is further provided with a stuffing box.

[0019] In one embodiment, the trigger device and the housing are tightly connected by a lock nut.

[0020] In one embodiment, the first capillary tube, the second capillary tube, and the housing are connected by a flushing joint.

[0021] In one embodiment, the first diaphragm and the second diaphragm are made of Hastelloy or 316L stainless steel.

[0022] In one embodiment, the pressure transmission medium is selected as high-temperature silicone oil. Description of the drawings:

[0023] Figure 1 It is a schematic structural diagram of a diaphragm type differential pressure switch for a mud system in an embodiment of the present invention.

[0024] Reference numerals:

[0025] High-pressure end 1

[0026] First flange 11

[0027] First diaphragm 12

[0028] First capillary tube 13

[0029] Low-pressure end 2

[0030] Second flange 21

[0031] Second diaphragm 22

[0032] The second capillary tube 23

[0033] The trigger structure 3

[0034] The housing 31

[0035] The internal cavity 311

[0036] The bellows 32

[0037] The differential pressure sensor 33

[0038] The trigger rod 331

[0039] The trigger device 34

[0040] The outer shell 341

[0041] The lever 342

[0042] The contact 343

[0043] The compression spring 344

[0044] The compression spring column 345

[0045] The adjusting bolt 346

[0046] The protection tube 347

[0047] The stuffing box 348

[0048] The lock nut 349

[0049] The filling joint 350 Specific implementation mode:

[0050] The problem to be solved by the present invention is to adopt a diaphragm differential pressure switch for a mud system to measure the differential pressure at both ends of pipelines, filters, etc. This technology belongs to the technical field of ship pipeline instruments.

[0051] Figure 1 It is a schematic structural diagram of a diaphragm differential pressure switch for a mud system in an embodiment of the present invention. As Figure 1 shown, in one embodiment, the present invention provides a diaphragm differential pressure switch for a mud system, and the diaphragm differential pressure switch for the mud system includes a high-pressure end 1, a low-pressure end 2, and a trigger structure 3;

[0052] The high-pressure end 1 further includes a first flange 11 and a first diaphragm 12. The first diaphragm 12 is arranged at the center of the first flange 11. One end of a first capillary tube 13 is connected to the first diaphragm 12, and a pressure transmission medium is filled;

[0053] The low-pressure end 2 further includes a second flange 21 and a second diaphragm 22. The second diaphragm 22 is arranged at the center of the second flange 21. One end of a second capillary 23 is connected to the second diaphragm 22 and filled with the pressure transmission medium.

[0054] The trigger structure 3 is connected to the other end of the first capillary 13 and the other end of the second capillary 23 respectively, so that the trigger structure 3 triggers a signal according to the pressure difference between the high-pressure end 1 and the low-pressure end 2 .

[0055] In this embodiment, a specific structure of a diaphragm pressure differential switch for a mud system is provided. In the prior art, the trigger structure 3 is directly in contact with mud and sand through different pipelines, and the pipelines will be blocked by mud and sand for a long time. In this embodiment, the diaphragms on the high-pressure end 1 and the low-pressure end 2, that is, the first diaphragm 12 and the second diaphragm 22 contact the mud and sand. Taking the first flange 11 structure as an example, the middle part of the flange structure is generally a through hole of a column, and the first diaphragm 12 blocks the through hole. When the external mud and sand have pressure, it will rise and press against the first diaphragm 12, causing it to bulge upward, which will further push the pressure transmission medium. In the first capillary 13, due to its small inner diameter, This spatial change of bulging can cause a large volume change of the pressure transmission medium. Let's look at the low-pressure end 2 again. The principle is basically the same, but the two will form a pressure comparison relationship in the trigger structure 3. Finally, when there is a pressure difference between the high-pressure end 1 and the low-pressure end 2 that exceeds the expected pressure difference, a signal alarm will be issued to prevent the pressure difference on both sides from being too large, causing subsequent system pressure instability. The first capillary 13 and the second capillary 23 prevent the mud and sand from being connected to the trigger structure 3 through the pipeline, so they no longer contact each other, which helps to solve the technical problem in the prior art that there is a lack of a method to prevent the mud system pressure differential switch from being easily blocked by mud and sand.

[0056] The first flange 11 and the second flange 21 of the high-pressure end 1 and the low-pressure end 2 are connected to the flanges on the pipeline or the filter by bolts.

[0057] In one embodiment, the trigger structure 3 includes a housing 31 and a bellows 32, and a differential pressure sensor 33;

[0058] The housing 31 has an internal cavity 311;

[0059] The bellows 32 is disposed inside the internal cavity 311, the bottom and top of the bellows 32 are respectively connected to the bottom and top of the housing 31, the first capillary 13 is connected to the inside of the bellows 32, and the second capillary 23 is connected to the internal cavity 311 outside the bellows 32;

[0060] The differential pressure sensor 33 is disposed in the internal space 311 and connected to the bellows 32 , so that the trigger rod 331 of the differential pressure sensor 33 triggers the trigger device 34 , and finally triggers the trigger signal.

[0061] In this embodiment, a specific implementation manner of a trigger structure 3 is provided. The housing 31 and the bellows 32 form two parts of space. One part is the part between the housing 31 and the bellows 32, and the second part is the inside of the bellows 32. The former is connected to the second capillary 23 of the low-pressure end 2, and the high-pressure end 1 is connected to the inside of the bellows 32. In this way, when the pressure in both parts increases, the filled pressure transmission medium will press on the differential pressure sensor 33. When the pressure rises, the trigger rod 331 touches the trigger device 34, and finally triggers the trigger signal.

[0062] The bellows 32 is used to separate the pressure transmission media at the high-pressure end and the low-pressure end.

[0063] In one embodiment, the trigger device 34 includes a housing 341 and a lever 342;

[0064] The lever 342 is arranged on the fulcrum inside the housing 341. The first end of the lever 342 has a contact 343, and the second end of the lever 342 is pressed by a compression spring 344. After the trigger rod 331 is lifted, it overcomes the pressure of the compression spring 344 to disengage the contact 343.

[0065] In this embodiment, a specific structure of the trigger device 34 is provided. The trigger device 34 forms a normally closed structure by contacting the micro switch 351 above through the contact 343, and the compression spring 344 at the other end always provides a downward pressure, giving the first end of the lever 342 an upward force to keep the contact in good contact. When the force provided by the differential pressure sensor 33 is greater than the force provided by the compression spring 344, the lever 342 acts and disengages from the micro switch, generating an electrical signal and transmitting it out.

[0066] In one embodiment, a compression spring post 345 is provided on the second end;

[0067] An adjusting bolt 346 is provided on the housing 341, and both ends of the compression spring 344 are sleeved on the compression spring post 345 and the adjusting bolt 346 respectively.

[0068] In this embodiment, a specific structure of the compression spring post 345 provided on the second end is provided. By screwing the adjusting bolt 346 up or down, the distance between the compression spring post 345 and the adjusting bolt 346 is changed, thereby changing the pressure of the compression spring 344, and also adjusting the preset value of the pressure difference by this method.

[0069] In one embodiment, a protective tube 347 is sleeved outside the first capillary 13 and the second capillary 23.

[0070] In this embodiment, a specific implementation manner of the protective tube 347 for externally protecting the first capillary 13 and the second capillary 23 is provided. The protective tube 347 is located outside the capillary 3 and functions to prevent the capillary from being physically damaged.

[0071] In one embodiment, a stuffing box 348 is further provided on the outer shell 341.

[0072] In this embodiment, a specific implementation manner is provided in which a stuffing box 348 is provided on the outer shell 341 for fixing the cable that transmits the electrical signal. The stuffing box 348 is made of stainless steel or copper, having higher stability and service life.

[0073] In one embodiment, the trigger device 34 and the outer shell 341 are tightly connected by a lock nut 349.

[0074] In this embodiment, a specific implementation manner of the connection mode between the trigger device 34 and the outer shell 341 is provided.

[0075] In one embodiment, the first capillary 13, the second capillary 23, and the housing 31 are connected by a filling joint 350. The pressure transmission medium is filled into the capillary through the filling joint 350.

[0076] In this embodiment, a specific connection structure of the first capillary 13, the second capillary 23, and the housing 31 is provided, that is, the filling joint 350.

[0077] In one embodiment, the first diaphragm 12 and the second diaphragm 22 are made of Hastelloy or 316L stainless steel.

[0078] In this embodiment, a specific material of the first diaphragm 12 and the second diaphragm 22 is provided. These two metals have good corrosion resistance and ductility.

[0079] In one embodiment, the pressure transmission medium is selected as high-temperature silicone oil.

[0080] In this embodiment, a specific implementation manner of the pressure transmission medium is provided. It has the advantages of low surface tension, thermal stability, safety and non-toxicity.

[0081] Beneficial effects:

[0082] 1. The diaphragm type differential pressure switch of the mud system is applicable to various media, especially the mud system;

[0083] 2. The diaphragm type differential pressure switch of the mud system has high reliability and a small probability of problems occurring after installation.

[0084] 3. The adjustable range of the alarm point setting value of the diaphragm type differential pressure switch of the mud system is large;

[0085] 4. The error of the alarm point setting value of the diaphragm type differential pressure switch of the mud system is small;

[0086] 5. The construction difficulty of the diaphragm type differential pressure switch of the mud system is small and it is easy to install.

[0087] The above-described embodiments only represent some embodiments of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A diaphragm differential pressure switch for a mud system, characterized in that: The mud system diaphragm differential pressure switch comprises: a high-pressure end (1), the high-pressure end (1) further comprising a first flange (11) and a first diaphragm (12), the first diaphragm (12) being arranged at the center of the first flange (11), the first diaphragm (12) being connected to one end of a first capillary tube (13) and filled with a pressure transmission medium; a low-pressure end (2), the low-pressure end (2) further comprising a second flange (21) and a second diaphragm (22), the second diaphragm (22) being arranged at the center of the second flange (21), the second diaphragm (22) being connected to one end of a second capillary tube (23) and filled with the pressure transmission medium; A trigger structure (3) is connected to the other end of the first capillary (13) and the other end of the second capillary (23) respectively, so that the trigger structure (3) triggers a signal according to the pressure difference between the high-pressure end (1) and the low-pressure end (2).

2. The diaphragm pressure differential switch for a mud system according to claim 1, characterized in that: The trigger structure (3) comprises: A housing (31) having an internal cavity (311); a bellows (32) disposed inside the internal cavity (311), the bottom and top of the bellows (32) being connected to the bottom and top of the housing (31) respectively, the first capillary tube (13) being in communication with the inside of the bellows (32), and the second capillary tube (23) being in communication with the internal cavity (311) outside the bellows (32); A differential pressure sensor (33) is arranged in the internal space (311) and connected to the bellows (32), so that a trigger rod (331) of the differential pressure sensor (33) triggers a trigger device (34), thereby finally triggering the trigger signal.

3. The diaphragm pressure differential switch for a mud system according to claim 2, characterized in that: The trigger device (34) comprises: a housing (341); A lever (342) is arranged on a fulcrum inside the housing (341); the first end of the lever (342) has a contact (343); the second end of the lever (342) is pressed by a compression spring (344); after the trigger rod (331) is lifted, the pressure of the compression spring (344) is overcome to disengage the contact (343).

4. The diaphragm pressure differential switch for a mud system according to claim 3, characterized in that: A compression spring column (345) is provided on the second end; An adjusting bolt (346) is provided on the housing (341), and two ends of the compression spring (344) are respectively sleeved on the compression spring column (345) and the adjusting bolt (346).

5. The diaphragm pressure differential switch for a mud system according to claim 4, characterized in that: The first capillary tube (13) and the second capillary tube (23) are covered with a protective tube (347).

6. The diaphragm differential pressure switch for a mud system according to claim 5, characterized in that: The housing (341) is also provided with a stuffing box (348).

7. The diaphragm differential pressure switch for a mud system according to claim 6, characterized in that: The trigger device (34) is locked and connected to the housing (341) via a locking nut (349).

8. The diaphragm differential pressure switch for a mud system according to claim 7, characterized in that: The first capillary tube (13), the second capillary tube (23), and the housing (31) are connected by a flushing joint (350).

9. The diaphragm differential pressure switch for a mud system according to claim 8, characterized in that: The first diaphragm (12) and the second diaphragm (22) are made of Hastelloy or 316L stainless steel.

10. The diaphragm differential pressure switch for a mud system according to claim 9, characterized in that: The pressure transmission medium is selected from high temperature silicone oil.

Images