Buffer type pressure gauge

Abstract

The utility model discloses a buffer type pressure gauge, which relates to the technical field of pressure gauges, and comprises a gauge box, a dial plate is arranged in the gauge box, a pointer is arranged on one side of the dial plate, a bourdon tube is arranged on one side, away from the pointer, of the dial plate, one end of the bourdon tube is connected with the pointer through a transmission assembly, and the other end of the bourdon tube is connected with the pointer. The end, away from the transmission assembly, of the bourdon tube is connected with a connecting tube, a first tube cavity and a second tube cavity are formed in the connecting tube, a buffering assembly is arranged in the second tube cavity and comprises a disc, and the two end faces of the disc are connected with a first corrugated telescopic tube and a second corrugated telescopic tube correspondingly. The end, away from the disc, of the first corrugated telescopic pipe is detachably connected with the connecting pipe through a first fixing pipe, and the end, away from the disc, of the second corrugated telescopic pipe is detachably connected with the connecting pipe through a second fixing pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure gauges, in particular to a buffer type pressure gauge. Background Art

[0002] The pressure gauge is used to detect the working status of the hydraulic system. During operation, the flow state of the fluid in the hydraulic system will suddenly change due to the reversal of the solenoid valve, the start of movement of the actuator or the movement of the actuator. The fluid will generate pressure shocks or pressure pulses in the hydraulic system due to its own inertia. The pressure is prone to unstable or instantaneous high pressure. Instruments and meters are often damaged instantly or continuously due to unstable pressure values, resulting in pressure gauges being damaged by impact.

[0003] A safety type shockproof pressure gauge with publication number CN211504470U includes a pressure gauge housing, a buffer device is provided at the lower end of the pressure gauge housing, the buffer device includes a buffer kit, the buffer kit is hollow inside, a connecting pipe is provided inside the buffer kit, a first through cavity is excavated inside the connecting pipe, a second through cavity matching the first through cavity is excavated inside the buffer kit, a pair of slots are excavated on one side of the connecting pipe close to the buffer kit, the pair of slots are symmetrically arranged about the first through cavity, a rolling ball is rotatably connected in the slot, an airbag is provided inside the buffer kit, and the airbag is provided on the side wall between the buffer kit and the connecting pipe. By arranging a buffer component on the pipe wall, the fluid can still directly rush into the pressure gauge, and the buffering effect of the device is not ideal. Therefore, it is necessary to design a buffer pressure gauge with improved pressure shock absorption effect. Utility Model Content

[0004] The utility model aims to provide a buffer pressure gauge to solve the problems raised in the above-mentioned background technology in view of the existing technical defects.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a buffered pressure gauge, comprising a meter box, a dial is arranged in the meter box, a pointer is arranged on one side of the dial, a Bourdon tube is arranged on the side of the dial away from the pointer, one end of the Bourdon tube is connected to the pointer through a transmission assembly, the end of the Bourdon tube away from the transmission assembly is connected to a connecting pipe, a tube cavity 1 and a tube cavity 2 are provided in the connecting pipe, a buffer assembly is arranged in the tube cavity 2, the buffer assembly comprises a disc, the two end surfaces of the disc are respectively connected to a corrugated expansion tube 1 and a corrugated expansion tube 2, the end of the corrugated expansion tube 1 away from the disc is detachably connected to the connecting tube through a fixed tube 1, and the end of the corrugated expansion tube 2 away from the disc is detachably connected to the connecting tube through a fixed tube 2.

[0006] The utility model further illustrates that the Bourdon tube is provided with a cavity, the cavity of the Bourdon tube is connected with tube cavity one, and the inner cavity of the bellows expansion tube one is connected with tube cavity one through fixed tube one, so that the cavity, tube cavity one, the inner cavity of fixed tube one and the inner cavity of bellows expansion tube one are connected with each other to form a sealed cavity, and a pressure-conducting fluid is arranged in the cavity.

[0007] The utility model further illustrates that the transmission assembly includes a rotating shaft, which is rotatably arranged at the center of the dial, one end of the rotating shaft along the axial direction is fixedly connected to the pointer, the side of the rotating shaft away from the pointer passes through the dial and is fixedly connected with gear one, the side of the dial away from the pointer is provided with a sector disk, the arc-shaped circumferential side of the sector disk is provided with gear two, the gear one is meshed with gear two, the side of the sector disk away from gear two is fixedly connected with a rotatable swing arm, the side of the swing arm away from the sector disk is rotatably connected with a connecting rod, and the side of the connecting rod away from the swing arm is rotatably connected to one end of the Bourdon tube.

[0008] The utility model further illustrates that the inner diameter of the second lumen is greater than the inner diameter of the first lumen.

[0009] The utility model further illustrates that the first bellows expansion tube and the second bellows expansion tube can both be elastically expanded and contracted along the second axis direction of the tube cavity.

[0010] The utility model further illustrates that the outer side of the portion of the connecting pipe that passes through the watch box is provided with an external thread for connecting a pipeline.

[0011] The utility model further illustrates that a liquid injection assembly is arranged on the connecting pipe, and the liquid injection assembly includes a liquid injection tube, and the liquid injection tube passes through the connecting pipe and is connected with a tube cavity, and one end of the liquid injection tube away from the connecting pipe is fixedly connected with a liquid filling valve.

[0012] Compared with the prior art, the beneficial effect achieved by the utility model is as follows: in the utility model, by providing the bellows expansion tube 2 and the disc, the fluid in the pipeline enters the bellows expansion tube 2, and the elastic expansion and contraction characteristics of the bellows expansion tube 2 buffer the pressure pulse generated in the pipeline, so that the pressure generated by the fluid in the pipeline on the disc is relatively stable.

[0013] By providing a bellows expansion tube sealed and connected with the cavity and the tube cavity and a pressure-conducting fluid filled therein, the fluid in the pipeline is indirectly pressure-transmitted through the pressure-conducting fluid, and at the same time, the transmitted pressure is secondary buffered by the elastic expansion and contraction characteristics of the bellows expansion tube, so that the pressure transmitted to the Bourdon tube is relatively stable, the damage to the internal structure of the pressure gauge is reduced, and the shock-absorbing effect of the pressure gauge is improved.

[0014] By setting the pressure-conducting fluid and replacing the liquid according to the use environment of the pressure gauge, the pressure gauge can have antifreeze, heat resistance and other effects.

[0015] By setting up the liquid injection assembly, it is convenient to supplement or replace the pressure guiding fluid in the pressure gauge, and at the same time play a role in debugging the accuracy of the pressure gauge pointer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a schematic diagram of the rear view sectional structure of the pressure gauge of the present invention;

[0019] In the figure: 1, meter box; 2, dial; 3, rotating shaft; 4, pointer; 5, first gear; 6, sector plate; 7, second gear; 8, swing arm; 9, connecting column; 10, Bourdon tube; 11, cavity; 12, connecting rod; 13, connecting pipe; 14, first pipe cavity; 15, second pipe cavity; 16, disc; 17, first corrugated expansion pipe; 18, first fixed pipe; 19, second corrugated expansion pipe; 20, second fixed pipe; 21, liquid injection assembly; 22, liquid injection pipe; 23, liquid filling valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present invention will be further described in detail and non - restrictively below in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Please refer to Figure 1-2 , the present invention provides a technical solution: a buffer pressure gauge, including a meter box 1, a dial 2 is arranged in the meter box 1, a scale is arranged on the dial 2, and a pointer 4 is arranged on one side of the dial 2. After the pointer 4 rotates relative to the dial 2 in the meter box 1, the real - time pressure value can be reflected through the scale.

[0022] On the side of the dial 2 facing away from the pointer 4, a Bourdon tube 10 is arranged. The Bourdon tube 10 is a hollow C - shaped bent thin - wall metal tube with elastic deformation. The Bourdon tube 10 is provided with a cavity 11, and the cross - sectional shape of the cavity 11 is oval or flat. The Bourdon tube 10 is a conventional existing technology.

[0023] One end of the Bourdon tube 10 is provided with a transmission assembly. The transmission assembly includes a rotating shaft 3. The rotating shaft 3 is rotatably arranged at the center of the dial 2. One end of the rotating shaft 3 along the axial direction is fixedly connected with a pointer 4.

[0024] On the side of the rotating shaft 3 away from the pointer 4, it penetrates through the dial 2 and is fixedly connected with a first gear 5. On the side of the dial 2 away from the pointer 4, a sector plate 6 is arranged. A second gear 7 is arranged on the arc circumferential side of the sector plate 6. The first gear 5 meshes with the second gear 7.

[0025] On the side of the sector plate 6 away from the second gear 7, a swing arm 8 is fixedly connected. On the side of the dial 2 away from the pointer 4, a connecting column 9 is arranged. The swing arm 8 is sleeved on the connecting column 9 at the position of the turning angle, so that the swing arm 8 rotates around the connecting column 9.

[0026] On the side of the swing arm 8 away from the sector plate 6, a connecting rod 12 is rotatably connected. On the side of the connecting rod 12 away from the swing arm 8, it is rotatably connected with one end of the Bourdon tube 10. One end of the Bourdon tube 10 away from the transmission assembly is fixedly connected with a connecting pipe 13. The connecting pipe 13 penetrates through the watch case 1 and is fixedly connected with the watch case 1.

[0027] A first pipe cavity 14 is arranged in the connecting pipe 13. The cavity 11 of the Bourdon tube 10 communicates with the first pipe cavity 14. One end of the connecting pipe 13 away from the Bourdon tube 10 is provided with a second pipe cavity 15. The second pipe cavity 15 communicates with the first pipe cavity 14. The inner diameter of the second pipe cavity 15 is larger than the inner diameter of the first pipe cavity 14.

[0028] A buffer assembly is arranged in the second pipe cavity 15. The buffer assembly includes a disc 16. The disc 16 is arranged in the second pipe cavity 15, and the outer circumferential surface of the disc 16 is in direct contact with the inner circumferential surface of the second pipe cavity 15, so that the disc 16 slides in the second pipe cavity 15.

[0029] On the side of the disc 16 close to the first pipe cavity 14, a first corrugated telescopic pipe 17 is fixedly connected. The first corrugated telescopic pipe 17 can elastically expand and contract along the axial direction of the second pipe cavity 15. On the side of the first corrugated telescopic pipe 17 away from the disc 16, a first fixed pipe 18 is fixedly connected. The first fixed pipe 18 is located in the first pipe cavity 14. The first fixed pipe 18 communicates with the first corrugated telescopic pipe 17. The first fixed pipe 18 is detachably connected with the connecting pipe 13. Specifically, external threads are arranged on the outer circumferential surface of the first fixed pipe 18, and internal threads are arranged on the inner wall of one end of the first pipe cavity 14 close to the second pipe cavity 15. The first fixed pipe 18 is screwed with the first pipe cavity 14, so that the first fixed pipe 18 is spirally fixed in the first pipe cavity 14.

[0030] The end face of the disc 16 close to one side of the lumen 14 is connected and sealed with the port of the corrugated expansion pipe 17. The inner cavity of the corrugated expansion pipe 17 is communicated with the lumen 14 through the fixed pipe 18, so that the cavity 11, the lumen 14, the inner cavity of the fixed pipe 18 and the inner cavity of the corrugated expansion pipe 17 are communicated with each other to form a sealed cavity. A pressure guiding fluid is arranged in the cavity, so that the pipeline fluid does not directly enter the cavity 11 to press the Bourdon tube 10. The pressure of the pipeline fluid is transmitted through the pressure guiding fluid as a medium to buffer the pressure change of the pipeline fluid.

[0031] The pressure guiding fluid includes but is not limited to antifreeze and water. The liquid is replaced according to the use environment of the pressure gauge, so that the pressure gauge has effects such as antifreeze and heat resistance.

[0032] On the side of the disc 16 far from the corrugated expansion pipe 17, a corrugated expansion pipe 19 is fixedly connected. The corrugated expansion pipe 19 can elastically expand and contract along the axial direction of the lumen 15. On the side of the corrugated expansion pipe 19 far from the disc 16, a fixed pipe 20 is fixedly connected. The fixed pipe 20 is located in the lumen 15. The fixed pipe 20 is communicated with the corrugated expansion pipe 19. The fixed pipe 20 is detachably connected with the connecting pipe 13. Specifically, external threads are provided on the outer circumferential surface of the outer edge of the fixed pipe 20, and internal threads are provided on the inner wall of one end of the lumen 15 far from the lumen 14. The fixed pipe 20 is screwed with the lumen 15, so that the fixed pipe 20 is helically fixed in the lumen 15.

[0033] By setting that the fixed pipe 18 and the fixed pipe 20 are detachably connected with the connecting pipe 13, it is convenient to disassemble and replace the buffer assembly.

[0034] The part of the connecting pipe 13 located outside the meter box 1 is provided with external threads. The connecting pipe 13 is screwed on the corresponding pipeline through the external threads. The lumen 15 is communicated with the inner cavity of the pipeline, so that the fluid in the pipeline enters the lumen 15, and the pressure of the fluid is detected by the pressure gauge.

[0035] A liquid injection assembly 21 is arranged on the part of the connecting pipe 13 between the external threads and the meter box 1. The liquid injection assembly 21 includes a liquid injection pipe 22. The liquid injection pipe 22 penetrates through the connecting pipe 13 and is communicated with the lumen 14. One end of the liquid injection pipe 22 far from the connecting pipe 13 is fixedly connected with a liquid filling valve 23. The liquid filling valve 23 is a conventional existing technology and is used to inject the pressure guiding fluid into the cavity or discharge the pressure guiding fluid in the cavity, supplement or replace the pressure guiding fluid in the cavity, and at the same time, by controlling the volume of the pressure guiding fluid in the cavity, adjust the pressure of the pressure guiding fluid on the cavity, so as to play a role in debugging the accuracy of the pressure gauge pointer 4.

[0036] In this embodiment, the connecting pipe 13 is fixedly connected to the pipeline through an external thread. After the fluid is introduced into the pipeline, part of the fluid enters the lumen of the second corrugated expansion pipe 19 under the action of the fluid pressure, and generates pressure on the lumen of the second corrugated expansion pipe 19. The second corrugated expansion pipe 19 is stretched towards the side close to the first lumen 14 under the action of the pressure, and generates a certain pressure on the disc 16.

[0037] At the same time, after the fluid completely fills the lumen of the second corrugated expansion pipe 19, through the buffering of the second corrugated expansion pipe 19, the fluid generates a stable pressure output on the disc 16, so that the disc 16 moves towards the side close to the first lumen 14 under the combined pressure of the second corrugated expansion pipe 19 and the fluid, thereby generating pressure on the first corrugated expansion pipe 17. The first corrugated expansion pipe 17 is compressed towards the side close to the first lumen 14 under the pressure of the disc 16, so that the pressure guiding fluid in the first corrugated expansion pipe 17 is squeezed and filled into the cavity 11 through the first lumen 14.

[0038] After the pressure guiding fluid is squeezed and filled into the cavity 11, the pressure on the inner wall of the cavity 11 increases, so that the elliptical cross-section of the cavity 11 elastically deforms into a state approaching a circular shape under the action of the pressure, thereby causing the end of the Bourdon tube 10 connected to the connecting rod 12 to move away from the side connected to the connecting pipe 13.

[0039] The connecting rod 12 pulls the swing arm 8 to rotate around the connecting column 9, so that the sector disc 6 connected to the swing arm 8 rotates around the connecting column 9. The second gear 7 on the sector disc 6 drives the first gear 5 to rotate, so that the pointer 4 rotates synchronously with the first gear 5 through the rotating shaft 3. In this way, the specific scale value indicated by the pointer 4 on the dial 2 indirectly represents the pressure value of the fluid in the pipeline.

[0040] The scale value indicated by the pointer 4 is positively correlated with the fluid pressure in the pipeline. When the fluid pressure in the pipeline is greater, the distance that the disc 16 moves towards the first lumen 14 is greater, the degree of compression of the first corrugated expansion pipe 17 is greater, the degree of squeezing and filling of the pressure guiding fluid into the cavity 11 is higher, so that the pressure of the pressure guiding fluid on the inner wall of the cavity 11 is greater, the distance that the end of the Bourdon tube 10 connected to the connecting rod 12 moves away from the side connected to the connecting pipe 13 is higher, the amplitude of the connecting rod 12 driving the swing arm 8 to rotate is greater, and thus the amplitude of the pointer 4 rotating is greater, and the value finally indicated by the pointer 4 on the scale is greater.

[0041] By setting a sealed cavity and a pressure guiding fluid in the cavity, the pipeline fluid does not directly enter the cavity 11 to exert pressure on the Bourdon tube 10. The pressure of the pipeline fluid is transmitted through the pressure guiding fluid as a medium, buffered the pressure change of the pipeline fluid, improved the stability of the deformation of the Bourdon tube 10 caused by the pressure, and further reduced the rotation frequency and change amplitude of the swing arm 8, playing a role in the stability and accuracy of the pointer 4 during rotation indication.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0043] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting them. Although the present utility model 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 for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A buffer pressure gauge, comprising a gauge box (1), characterized in that: A dial box (1) is provided with a dial (2) inside. A pointer (4) is arranged on one side of the dial (2). A Bourdon tube (10) is arranged on the side of the dial (2) facing away from the pointer (4). One end of the Bourdon tube (10) is connected to the pointer (4) through a transmission assembly. The end of the Bourdon tube (10) away from the transmission assembly is connected with a connecting pipe (13). A first pipe cavity (14) and a second pipe cavity (15) are formed inside the connecting pipe (13). A buffer assembly is arranged inside the second pipe cavity (15). The buffer assembly includes a disc (16). Both end faces of the disc (16) are respectively connected with a first corrugated expansion pipe (17) and a second corrugated expansion pipe (19). The end of the first corrugated expansion pipe (17) away from the disc (16) is detachably connected to the connecting pipe (13) through a first fixing pipe (18). The end of the second corrugated expansion pipe (19) away from the disc (16) is detachably connected to the connecting pipe (13) through a second fixing pipe (20).

2. A buffer pressure gauge according to claim 1, characterized in that: The Bourdon tube (10) is provided with a cavity (11). The cavity (11) of the Bourdon tube (10) is communicated with the first pipe cavity (14). The inner cavity of the first corrugated expansion pipe (17) is communicated with the first pipe cavity (14) through the first fixing pipe (18), so that the cavity (11), the first pipe cavity (14), the inner cavity of the first fixing pipe (18) and the inner cavity of the first corrugated expansion pipe (17) are mutually communicated to form a sealed cavity, and a pressure guiding fluid is arranged inside the cavity.

3. A buffer pressure gauge according to claim 1, wherein: The transmission assembly includes a rotating shaft (3). The rotating shaft (3) is rotatably arranged at the center of the dial (2). One end of the rotating shaft (3) along the axis direction is fixedly connected with the pointer (4). The side of the rotating shaft (3) away from the pointer (4) penetrates through the dial (2) and is then fixedly connected with a first gear (5). A sector plate (6) is arranged on the side of the dial (2) facing away from the pointer (4). A second gear (7) is arranged on the arc circumferential side of the sector plate (6). The first gear (5) is meshed with the second gear (7). A rotatable swing arm (8) is fixedly connected to the side of the sector plate (6) away from the second gear (7). One side of the swing arm (8) away from the sector plate (6) is rotatably connected with a connecting rod (12). One side of the connecting rod (12) away from the swing arm (8) is rotatably connected with one end of the Bourdon tube (10).

4. A buffer pressure gauge according to claim 1, wherein: The inner diameter of the second pipe cavity (15) is larger than that of the first pipe cavity (14).

5. A buffer pressure gauge according to claim 1, characterized in that: Both the first corrugated expansion pipe (17) and the second corrugated expansion pipe (19) can elastically expand and contract along the axis direction of the second pipe cavity (15).

6. A buffer pressure gauge according to claim 1, characterized in that: The part of the connecting pipe (13) penetrating through the dial box (1) is provided with an external thread for connecting a pipeline on the outer side.

7. A buffer pressure gauge according to claim 1, characterized in that: A liquid injection assembly (21) is arranged on the connecting pipe (13). The liquid injection assembly (21) includes a liquid injection pipe (22). The liquid injection pipe (22) penetrates through the connecting pipe (13) and is communicated with the first pipe cavity (14). A liquid filling valve (23) is fixedly connected to the end of the liquid injection pipe (22) away from the connecting pipe (13).

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