CN113776726B - Pressure measuring joint and pressure measuring system - Google Patents
Pressure measuring joint and pressure measuring system Download PDFInfo
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- CN113776726B CN113776726B CN202110942084.0A CN202110942084A CN113776726B CN 113776726 B CN113776726 B CN 113776726B CN 202110942084 A CN202110942084 A CN 202110942084A CN 113776726 B CN113776726 B CN 113776726B
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- rubber column
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- pressure measuring
- rubber
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- 229920001971 elastomer Polymers 0.000 claims abstract description 130
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 66
- 239000000523 sample Substances 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 238000012856 packing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 238000003825 pressing Methods 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
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- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
Abstract
The utility model provides a pressure measurement connects and pressure measurement system belongs to pipeline valve technical field, including casing, rubber post, spacing ring, end cover, wherein is provided with the cavity in the casing, and rubber post, spacing ring pass through interference fit and install in the cavity, and the upper and lower both ends of casing are provided with the screw thread, casing and end cover threaded connection are provided with gasket or packing ring between the port of end cover and casing upper end, and rubber post quantity is one, and its head is provided with round platform column structure. The pressure measuring system comprises a pressure measuring joint and a pressure measuring probe, wherein the pressure measuring probe comprises a pressure column, a nut, a needle tube, a sheath, a screw cap and the like, and the needle tube is used for puncturing the rubber column during pressure measurement and is contacted with fluid for pressure measurement. The pressure measuring joint and the pressure measuring system are small in size, light in weight, good in sealing performance, less in pollution, low in potential safety hazard and wide in application range.
Description
Technical Field
The utility model belongs to the technical field of pipeline valves, and particularly relates to a pressure measuring joint and a pressure measuring system.
Background
In production and life, pressure detection is often needed for high-pressure and low-pressure fluid systems, if the pressure of fluid in a pipeline or other hydraulic devices is measured by adopting a pressure measuring instrument with a fixed interface installed at each measuring point, the input cost is too high, and a great burden is caused to a user, so that a pressure measuring joint is developed, a cavity communicated with fluid to be measured is arranged in a shell of the pressure measuring joint, and a sealing element (such as a valve core and a rubber column) and a limiting ring are installed in the cavity. The pressure measuring joint can keep the hydraulic system in a sealing state, has small structure, low manufacturing cost and convenient connection with an instrument, is widely applied to occasions such as daily life, water conservancy companies, electric companies, sewage treatment plants and the like, and greatly improves the pressure measurement of the hydraulic system.
The conventional pressure measuring joint comprises two working modes, wherein the first mode is to use a thimble to push down a valve core to release a sealing state, and high-pressure fluid in a hydraulic system is automatically guided out to a cavity above the valve core and then subjected to pressure measurement.
For example, patent publication No. CN203927168U discloses a novel pressure measuring joint, which comprises a joint body, a stepped hole made in the length direction of the joint body for pressure measurement, and a valve core slidably positioned in the stepped hole; the method is characterized in that: the valve core is made of elastic material and is arranged in a larger hole of the stepped hole, and the top end surface of the valve core is matched with the stepped surface in the stepped hole to realize sealing fit; the outer circumferential surface of the valve core is also provided with a notch which penetrates through the valve core in the length direction so as to be beneficial to the movement of fluid. The working principle of the valve core is that the conical surface at the top of the valve core is matched with the stepped surface to realize sealing, the valve core is pushed downwards by the thimble, so that the top end surface of the valve core leaves the stepped surface, high-pressure fluid flows out from the notch to the stepped hole at the top end of the valve core, then pressure measurement is carried out, and after the pressure measurement is finished, the valve core is pushed back to the original sealing position by the high pressure of the fluid.
The above patent has the following disadvantages: firstly, the application scene is narrow, and the valve is only suitable for pressure measurement of high-pressure fluid, and low-pressure or negative-pressure fluid cannot maintain the top of the valve core on the step surface and cannot realize sealing; secondly, the pollution degree is high, and the fluid remained on the valve core is easy to accelerate the corrosion and aging of the valve core, so that the service life of the pressure measuring joint is short; thirdly, potential safety hazards exist, and for partial fluids such as inflammable and explosive gases and toxic gases, the partial fluids are led out from the original pipeline to have great potential safety hazards, so that the application scene of the joint is further reduced; in addition, the problems that the size of the opening is not easy to determine, the opening is easy to silt, leakage easily occurs when the opening is influenced by unstable factors such as vibration, the processing precision requirement of the matching surface of the valve core and the stepped hole is high, the production cost is high and the like exist.
The second mode of operation of the pressure tap is: the rubber column is assembled through interference fit, the more the interference that the rubber column exists relative to the shell of the pressure measuring joint, the more closely the cylindrical surface of the rubber and the shell are extruded, the better the sealing effect, and meanwhile, the more difficult the assembly.
For example, CN206449291U discloses a quick-insert pressure tap for a valve. The valve seat is in interference fit with an inner hole of the valve body, the outer circle of the sealing ring is conical, the sealing with the valve body can be guaranteed while the valve seat is convenient to install, the valve bonnet is in threaded connection with the valve body, the O-shaped ring is arranged in the middle to ensure tightness, and a plastic belt is arranged between the valve bonnet and the valve body. According to the utility model, the counter bores are respectively arranged at the two ends of the sealing ring, so that the center thickness of the sealing ring is thinned, the pressure measuring probe of the testing equipment is convenient to insert and pull out, the sealing effect is enhanced, the service life is prolonged, and even if one layer of the sealing ring is damaged, the other layer of the sealing ring can be sealed, so that the pressure measuring nozzle can be normally used; a plastic belt is arranged between the valve body and the valve cap, two ends of the plastic belt are respectively sleeved into the valve body and the valve cap, and the valve cap can be prevented from being lost when the valve cap is unscrewed.
This patent uses the second mode of operation, has reduced pollution and potential safety hazard, and applicable scene is more, but sealing washer (i.e. rubber column) of the through structure that this patent set up, when the pressure measurement probe just inserts, under the effect, round rubber around the counter bore can have the indent motion state, and this kind of deformation of sealing washer can influence its leakproofness at this moment greatly, even has set up two sealing washer stack, at this moment that the pressure measurement probe inserts, this pressure measurement mouth's leakproofness still is relatively poor.
The utility model discloses an improve the pressure measurement joint who uses the second mode, among the solution prior art, pressure measurement joint uses the rubber column of direct structure, and rubber column deformation influences the problem of leakproofness when the pressure measurement probe inserts, provides a leakproofness good, pollute few, the potential safety hazard is low, the range of application is wide pressure measurement joint.
Disclosure of Invention
The shell of the pressure measuring connector is internally provided with a cavity communicated with fluid, a rubber column and a limiting ring are arranged in the cavity in an interference fit mode, a pressure measuring probe which is used for measuring pressure during pressure measurement stretches into the cavity, the rubber column is punctured, the pressure measuring probe is enabled to be in contact with the fluid for pressure measurement, the pressure measuring probe is pulled out after the pressure measurement is finished, and the punctured hole on the rubber column is automatically healed to maintain sealing.
The utility model discloses a to the rubber post that uses the direct structure among the prior art, rubber post deformation and influence the problem of leakproofness when the pressure measurement probe inserts, provide a better pressure measurement of leakproofness and connect and pressure measurement system, simultaneously, this pressure measurement connects and pressure measurement system is small, pollutes fewly, potential safety hazard is low, the range of application is wide.
One of the concepts of the present disclosure is to change a rubber column from a rubber column having a straight-through structure into a rubber column having a tapered surface at a head portion, and the tapered surface portion may generate an outward extrusion force on the rubber below when the pressure probe is inserted, so that compared with the conventional rubber column having a concave shape after being subjected to a force, the outward deformation can increase the extrusion force between the cylindrical surface of the rubber column and the housing, and increase the sealing effect.
Another concept of the present disclosure is to improve a conical surface structure provided at a head of a rubber column into a circular truncated cone-shaped structure, that is, the head of the rubber column is provided with a circular horizontal plane, and the pressure probe is not easy to slip when being inserted from the horizontal plane, so that the operation is more convenient, considering that the pressure probe is easy to slip when being inserted from the conical surface or the needle is unevenly stressed and deformed.
The utility model discloses a still further conception lies in, based on take place when deformation, be provided with the rubber post leakproofness of round platform structure and be better than the rubber post of straight through structure (be provided with sinking platform), only install a rubber post in the cavity of this disclosure pressure measurement joint, need set up two rubber posts in the contrast prior art and can realize sealedly, this disclosure has reduced rubber post quantity under the circumstances of guaranteeing the leakproofness for the length of whole pressure measurement joint is shorter, and is smaller, can reduce the cost, is applicable to narrow environment.
Another concept of the present disclosure is that the rubber column is in interference fit with the housing, so that the rubber column is not easy to be pressed into the cavity, and the top of the rubber column is set to be in a conical surface or a truncated cone structure, so that the problem can be solved, and the assembly is easier.
Another concept of the present disclosure is that the bottom surface of the rubber column is provided with a protrusion, so that the fixation of the rubber column is more convenient during the assembly.
The other conception of the present disclosure is that when the cylindrical surface is used as the sealing end surface to bear high pressure, the problem of leakage caused by abrasion and deformation of the rubber column due to excessive specific pressure may occur, and as an improvement, an inclined surface which is matched with the conical surface of the rubber column or the side surface shape of the round table is arranged in the cavity of the pressure measuring joint, the two surfaces are jointed when the rubber column is assembled, and when the fluid pressure is high, extrusion is also generated between the side surface of the conical surface or the round table and the shell, so that the sealing end surface area is increased, and the pressure measuring joint can bear a wider range of pressure.
Another concept of the present disclosure is that the rubber post and the stop collar are both interference fit and reliable in operation under impact and vibration loads.
Another concept of the present disclosure is that the stop collar is provided with a chamfer so that the stop collar can be more easily pressed into the cavity during assembly.
The limiting ring is basically in a circular ring shape and is divided into a first section and a second section, the first section is provided with a chamfer, the diameter of the first section is basically equal to that of the cavity, the diameter of the second section is larger than that of the cavity, the first section provided with the chamfer is firstly arranged in the cavity during assembly, and then the second section is pressed into the cavity, so that the assembly is faster and the assembly effect is better.
Further, another conception of the present disclosure is that the outer surface of the second section of the limiting ring is provided with knurls, the knurls are in interference fit with the shell, the assembly effect is better, the limiting ring is not easy to shake and fall off, and the pressure measuring joint is more durable.
The utility model provides a pair of pressure measurement connects, including the casing, the rubber post, the spacing ring, the end cover, be provided with the cavity in wherein the casing, the rubber post is installed in the cavity with the spacing ring, casing upper end and end cover threaded connection, the surface of casing lower extreme is equipped with the screw thread of being connected usefulness with hydraulic system.
Further, the cavity comprises an upper cavity and a lower cavity, the upper cavity at the upper end of the cavity is basically provided with a first aperture, the lower cavity at the lower end of the cavity is basically provided with a second aperture, the rubber column and the limiting ring are arranged in the lower cavity, and the first aperture is smaller than the second aperture and is used for preventing the rubber column from being upwards flushed out of the cavity under the action of high-pressure fluid after being damaged and deformed.
Further, the rubber column and the limiting ring are assembled on the shell through interference fit, and the connecting mode of the interference fit is adopted, so that the rubber column and the limiting ring are simple in structure and good in coaxiality, can bear larger axial force, are firmly assembled at the fixed position of the shell, and can maintain good sealing performance under the conditions of low system pressure or various instabilities such as vibration.
In some embodiments, the rubber column includes basic cylinder structure, is provided with the conical surface structure at the head of rubber column, and when the pressure measurement probe inserts, the conical surface can exert outside force to the cylinder of rubber column, and sets up the rubber column of the through structure of sinking platform, and its cylinder is indent after the atress, and this disclosed rubber column is outwards deformation when accepting the pressure measurement probe, can increase the extrusion force between the cylinder of rubber column and casing, further extrudees the casing, increases sealed effect. And when assembling the rubber column, the conical surface structure is pushed into the cavity, so that the rubber column is easier to assemble.
Further, considering that the pressure measurement probe is easy to slip when being inserted into the rubber column from the conical surface, or the needle head is unevenly stressed and can deform, the conical surface structure of the head part of the rubber column is improved into a circular truncated cone-shaped structure, and the pressure measurement probe is difficult to slip when being inserted from the top surface of the circular truncated cone, so that the operation is more convenient.
In this disclosure, set up a rubber post and can have better leakproofness, compare the structure of two existing rubber posts, can reduce the overall length and the weight of pressure measurement joint, make the pressure measurement joint more portable light and handy, be suitable for the narrow and small environment department in space and use.
In some embodiments, the limiting ring is installed at the lower end of the shell, and is used for preventing accidents caused by fluid mixing after the rubber column falls off, and the limiting ring is installed at the port of the lower end of the shell, so that the connecting structure is ensured to be stable, and meanwhile work consumed in assembly can be reduced.
Further, the top of the limiting ring is provided with a chamfer, so that the assembly is convenient.
Further, the limiting ring is basically in a ring shape and is divided into a first section and a second section, the first section is provided with a chamfer, the diameter of the first section is basically equal to that of the cavity, the diameter of the second section is larger than that of the cavity, the first section provided with the chamfer is firstly filled into the cavity during assembly, then the second section is pressed into the cavity, the assembly is faster, and the assembly effect is better.
Further, the outward surface of spacing ring second section is provided with the annular knurl, annular knurl and casing interference fit, and the assembly effect is better, and the spacing ring is difficult for rocking, drops, and the pressure measurement connects more durable.
In some embodiments, a gasket or a washer is arranged between the end cover and the port at the upper end of the shell, so that the whole cavity can be sealed, the influence of outside air, rainwater, dust and the like on the rubber column is avoided, in addition, when the rubber column leaks, fluid cannot overflow due to the sealing effect of the end cover, the gasket and the washer, and the pressure of the fluid can be kept stable.
In some embodiments of the present disclosure, the outer surface of the end cover is provided with knurling, the knurling is straight knurling or reticulation knurling, and when the end cover is rotated by the knurling, the friction between the hand and the end cover is increased, so that the end cover is more convenient to screw or unscrew, and the operation of a user is convenient.
Further, a rubber belt is connected between the end cover and the shell, two ends of the rubber belt are respectively fixed on the end cover and the shell, and the end cover can be prevented from being lost when the end cover is unscrewed.
In some embodiments of the present disclosure, the rubber column is installed directly above the stop collar, that is, the bottom surface of the rubber column contacts the stop collar, and the rubber column is installed at the position, which can reduce the depth of the rubber column pressed into the cavity, and reduce the work consumed during assembly.
In some embodiments of the present disclosure, the rubber column bottom surface is provided with a truncated cone-shaped protrusion, by means of which the rubber column can be better fixed on the pressing tool or the buffer when the rubber column is pressed into the cavity.
In some embodiments of the disclosure, an inclined plane matching with the shape of the head conical surface of the rubber column is arranged between the upper cavity and the lower cavity, and the rubber column is assembled by penetrating the rubber column into the cavity, so that the head conical surface of the rubber column is attached to the inclined plane, and when the fluid pressure is high, extrusion is also generated between the head conical surface of the rubber column and the shell, the sealing end surface area is increased, and the problem that leakage is caused by abrasion and deformation of the rubber column due to overlarge sealing specific pressure when the cylindrical surface is used as the sealing end surface to bear high pressure is solved, so that the pressure measuring joint can bear pressure in a wider range.
The utility model provides a pressure measurement system, including manometer, pressure measurement probe, with the pressure measurement connects, the manometer is connected on pressure measurement probe, pressure measurement probe includes pressure post, nut, needle tubing, sheath, spiral cover.
Further, the needle cannula is substantially a hollow cylinder with a needle hole at one end for fluid passage. In order to avoid the rubber column from blocking the needle hole, the needle hole is arranged on the side surface of the needle tube.
Furthermore, one end of the needle tube is sleeved with a pressing column, a nut is sleeved outside the pressing column, and the nut is held by using the pressure measuring probe, so that the operation is convenient.
Further, a spiral cover is fixedly arranged on the needle tube, knurling is arranged outside the spiral cover, threads are arranged in the spiral cover, and an external thread which is adapted to the spiral cover is arranged on the sheath. The sheath is convenient to assemble and disassemble, and the knurling is arranged on the spiral cover, so that the sheath is convenient to hold.
Further, the sheath is basically in a ring shape, and wraps the needle tube, so that the needle tube is prevented from being exposed, and the function of protecting the needle tube is achieved.
During pressure measurement, the end cover of the pressure measurement connector is opened, the sheath on the pressure measurement probe is taken down, the needle tube stretches into the cavity of the pressure measurement connector, after the needle tube passes through the rubber column, fluid can enter the needle tube from the needle hole, and it can be understood that the spiral cover can be arranged on the shell of the pressure measurement connector, and the spiral cover is internally provided with the sealing ring.
After the pressure measurement is finished, the screw cap is unscrewed, the needle tube is pulled out, the rubber column is automatically healed, the end cap is screwed up, and the pressure measurement joint keeps tightness.
Compared with the prior art, the pressure measuring joint has the advantages of small size, light weight, good sealing performance and the like. When the pressure measuring system comprising the pressure measuring joint is used for measuring pressure, fluid is not required to be led out to the upper cavity, so that the pollution is less, the potential safety hazard is low, the application range is wide, and the operation is convenient.
Drawings
The present disclosure will be described in further detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the present disclosure. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.
Fig. 1: a front view of a pressure tap provided by the present disclosure;
fig. 2: a top view of a pressure tap provided by the present disclosure;
fig. 3: the pressure measuring joint A-A is provided with a schematic section view in the direction of a pressure measuring joint A-A;
fig. 4: an explosion diagram of a pressure tap provided by the present disclosure;
fig. 5: a front view of a pressure probe is provided by the present disclosure;
fig. 6: a top view of a pressure probe provided by the present disclosure;
fig. 7: the present disclosure provides a schematic cross-sectional view of a pressure probe in the B-B direction;
fig. 8: an exploded view of a pressure probe provided by the present disclosure;
wherein, 01, rubber belt; 02. an end cap; 03. a housing; 04. a rubber column; 05. a limiting ring; 06. a gasket; 031. an upper cavity; 032. a lower cavity; 11. pressing a column; 12. a screw cap; 13. a needle tube; 14. a sheath; 15. and (5) screwing the cover.
Detailed Description
The present disclosure is described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present disclosure will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present disclosure.
Embodiment one: the disclosure provides a pressure measuring joint, as shown in fig. 1-4, it includes casing 03, rubber column 04, spacing ring 05, end cover 02, wherein be provided with the cavity in casing 03, the cavity includes cavity 031 and cavity 032 down, rubber column 04 and spacing ring 05 install cavity 032 down, casing 03 upper end and end cover 02 threaded connection, the surface of casing 03 lower extreme is equipped with the screw thread of being connected usefulness with hydraulic system.
Further, the upper cavity 031 at the upper end of the cavity has a first aperture, the lower cavity 032 at the lower end of the cavity has a second aperture, the upper cavity 031 is coaxial with the lower cavity 032, and the first aperture is smaller than the second aperture, so as to prevent the rubber column 04 from being damaged and deformed and then being flushed out of the cavity upwards under the action of high-pressure fluid.
Further, the rubber column 04 is a nitrile rubber column 04, the rubber column 04 and the limiting ring 05 are assembled on the housing 03 through interference fit, and the rubber column 04 and the limiting ring 05 are connected in an interference fit manner, so that the rubber column 04 is simple in structure and good in coaxiality, can bear large axial force, can be firmly assembled at a fixed position of the housing 03, and can maintain good sealing performance under the conditions of low system pressure or various instabilities such as vibration.
It will be appreciated that in other embodiments, different materials may be used for the rubber column 04 to accommodate different fluid media.
Further, the head of rubber column 04 sets up to round platform column structure, and when pressure probe inserts, the round platform can exert outside force to the cylinder of rubber column 04, and sets up the rubber column 04 of the through structure of sinking the platform, and the cylinder is indent behind the atress, and the deformation that this disclosed rubber column 04 produced when accepting pressure probe can not produce negative influence to the leakproofness, but can further extrude casing 03, makes the leakproofness better to, when assembling rubber column 04, push the round platform in casing 03 earlier, more easy assembly.
In this embodiment, set up a rubber post 04 and can have better leakproofness, compare the structure of two rubber posts 04 now, can reduce the overall length and the weight of pressure measurement joint, make the pressure measurement joint more portable light and handy, be suitable for the use of the environment department in space narrow and small.
Furthermore, the limiting ring 05 is installed at the port of the lower end of the shell 03, so that accidents caused by fluid mixing after the rubber column 04 falls off can be prevented, the stability of a connecting structure can be ensured, and meanwhile, work consumed in assembly can be reduced.
Further, be provided with gasket 06 between end cover 02 and casing 03 upper end port, can seal whole cavity, avoid outside air, rainwater, dust etc. to influence rubber column 04, in addition, when rubber column 04 takes place to reveal, because the sealed effect of end cover 02 and gasket 06, packing ring, the fluid can not overflow, and fluidic pressure can maintain stably.
In other embodiments, a gasket, such as a ed ring, is disposed between the end cap 02 and the upper end port of the housing 03.
Further, the spacing ring 05 is basically circular, and it divide into first section and second section, is provided with the chamfer on the first section, and the diameter of first section is equal to the diameter of cavity basically, and the surface of second section is provided with the annular knurl, annular knurl and casing 03 interference fit, and the first section that is equipped with the chamfer when assembling is packed into the cavity earlier, and then with the second section cavity of impressing, the assembly is faster, annular knurl and casing 03 interference fit, and assembly effect is better, and spacing ring 05 is difficult for rocking, drops, and the pressure measurement connects more durable.
Furthermore, the knurling is reticulate knurling, and can be locked better.
In other embodiments, the outer surface of the stop collar 05 is provided with knurling, such as knurling, or other knurling.
The knurling is provided with to end cover 02 surface, and the end cover size is less, and the knurling sets up when making rotatory end cover 02, and the frictional force between hand and end cover 02 increases, more conveniently screws up or unscrews end cover 02, and the convenience of customers operates.
In other embodiments, the knurls are straight knurls or other knurls.
Further, a rubber belt 01 is connected between the end cover 02 and the shell 03, two ends of the rubber belt 01 are respectively fixed on the end cover 02 and the shell 03, the end cover 02 can be prevented from being lost when the end cover 02 is unscrewed, and the rubber belt 01 is soft and is not easy to scratch a human body.
Further, the rubber column 04 is installed right above the limiting ring 05, that is, the bottom surface of the rubber column 04 contacts with the limiting ring 05, and the rubber column 04 is installed at the position, so that the depth of the rubber column 04 pressed into the cavity can be reduced, and work consumed during assembly is reduced.
Further, the bottom surface of the rubber column 04 is provided with a truncated cone-shaped protrusion, and when the rubber column 04 is pressed into the cavity, the rubber column 04 can be better fixed on a pressing tool or a buffer by means of the truncated cone-shaped protrusion.
When the pressure measurement is carried out, the pressure measurement probe is used for inserting and puncturing the rubber column 04, the pressure measurement probe directly penetrates into fluid to be measured to carry out the pressure measurement, after the pressure measurement probe is pulled out, the poked holes are automatically healed due to the material property of the rubber, and compared with the measurement mode that the fluid is required to be led into the upper part of the rubber column 04, the pressure measurement method has the advantages of less pollution, low potential safety hazard and wider application range.
Embodiment two: the main difference between this embodiment and the first embodiment is that the installation position of the rubber column 04 in the lower cavity 032 is different, in this embodiment, the depth of the rubber column 04 pressed into the housing 03 is larger when the rubber column 04 is assembled, and an inclined plane matching with the inclined plane of the truncated cone structure of the head of the rubber column 04 is provided between the upper cavity 031 and the lower cavity 032, when the rubber column 04 is assembled, the inclined plane of the rubber column 04 is made to be matched with the inclined plane on the housing 03, when the fluid pressure is larger, the extrusion is also generated between the inclined plane of the rubber column 04 and the housing 03, the sealing end surface area is increased, and the problem that leakage is caused by abrasion and deformation of the rubber column 04 due to overlarge sealing specific pressure when the cylindrical surface is used as the sealing end surface is solved.
Embodiment III: the embodiment is a pressure measuring system, which comprises a pressure gauge, a pressure measuring probe and the pressure measuring connector, wherein the pressure gauge is connected to the pressure measuring probe, and the pressure measuring probe is shown in fig. 5-8 and comprises a pressure column 11, a nut 12, a needle tube 13, a sheath 14 and a spiral cover 15.
Further, the needle tube 13 is a substantially hollow cylinder inside, and one end of the needle tube 13 is provided with a needle hole for fluid to pass through. In order to avoid the rubber column 04 from blocking the needle hole, the needle hole is provided at the side of the needle tube 13.
Further, one end of the needle tube 13 is sleeved with a pressing column 11, a nut 12 is sleeved outside the pressing column 11, and the nut 12 is held by a pressure measuring probe, so that the operation is convenient.
Further, a screwing cap 15 is fixedly installed on the needle tube 13, knurling is arranged outside the screwing cap 15, threads are arranged inside the screwing cap, and an external thread adapted to the screwing cap 15 is arranged on the sheath 14. The sheath 14 is convenient to assemble and disassemble, and the rotary cover 15 is provided with knurling, so that the hand-held operation is convenient.
Further, the sheath 14 is basically in a ring shape, and wraps the needle tube 13, so that the needle tube 13 is prevented from being exposed, and the needle tube 13 is protected.
During pressure measurement, the end cover 02 of the pressure measurement connector is opened, the sheath 14 on the pressure measurement probe is removed, the needle tube 13 extends into the cavity of the pressure measurement connector, after the needle tube 13 passes through the rubber column 04, fluid can enter the needle tube 13 from a needle hole, it can be understood that the spiral cover 15 can be arranged on the shell of the pressure measurement connector, and the spiral cover 15 is internally provided with a sealing ring.
After the pressure measurement is finished, the screw cap 15 is unscrewed, the needle tube 13 is pulled out, the rubber column 04 is automatically healed, the end cap 02 is screwed down, and the pressure measurement joint keeps tightness.
Compared with the prior art, the pressure measuring joint has the advantages of small size, light weight, good sealing performance and the like. When the pressure measuring system comprising the pressure measuring joint is used for measuring pressure, fluid is not required to be led out to the upper cavity, so that the pollution is less, the potential safety hazard is low, the application range is wide, and the operation is convenient.
The foregoing disclosure has been presented in a detail description, with specific examples being used herein to illustrate the principles and embodiments of the disclosure, the above examples being provided solely to assist in the understanding of the disclosure and core ideas. It should be noted that it would be apparent to those skilled in the art that various improvements and modifications could be made to the present disclosure without departing from the principles of the present disclosure, and such improvements and modifications would be within the scope of the claims of the present disclosure.
Claims (8)
1. A pressure fitting, characterized by: the pressure tap includes:
the shell is internally provided with a cavity along the axial direction, the cavity comprises an upper cavity and a lower cavity, and the outer surface of the lower end of the shell is provided with threads for connecting with a hydraulic system;
a rubber column installed in the lower cavity for sealing;
the limiting ring is arranged in the lower cavity and below the rubber column and used for preventing the rubber column from entering a pipeline of the hydraulic system;
the end cover is in threaded connection with the shell;
the rubber column and the limiting ring are assembled in the cavity of the shell through interference fit, and the head of the rubber column is provided with a truncated cone-shaped structure;
the shell is provided with an inclined plane matched with the round platform structure of the rubber column, and the rubber column is attached to the inclined plane for sealing.
2. A pressure fitting according to claim 1, wherein: the end cover is internally provided with a gasket or a washer.
3. A pressure fitting according to claim 1, wherein: a rubber belt is connected between the end cover and the shell, and knurling is arranged on the outer surface of the end cover.
4. A pressure fitting according to claim 1, wherein: the limiting ring is basically annular, a chamfer is arranged on the limiting ring, a knurl is arranged on the outer surface of the limiting ring, and the knurl is in interference fit with the shell.
5. A pressure measuring system comprising the pressure measuring joint of any one of claims 1-4, a pressure measuring probe and a pressure gauge, wherein the pressure gauge is connected to the pressure measuring probe, the pressure measuring probe comprises a pressure column, a nut, a needle tube, a sheath and a screw cap, wherein the pressure column and the nut are arranged at one end of the needle tube and used for being held by a hand, the screw cap is fixedly arranged on the needle tube, and the sheath is in threaded connection with the screw cap and used for protecting the needle tube.
6. A pressure measurement system according to claim 5, wherein: and a gasket is arranged in the spiral cover.
7. A pressure measurement system according to claim 5, wherein: the screw cap can be attached to the housing of the pressure tap.
8. A pressure measurement system according to claim 5, wherein: the needle tube is basically a cylinder with a hollow inside, and the side surface of the needle tube is provided with a needle hole for fluid to pass through.
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| CN202110942084.0A CN113776726B (en) | 2021-08-17 | 2021-08-17 | Pressure measuring joint and pressure measuring system |
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| CN202110942084.0A CN113776726B (en) | 2021-08-17 | 2021-08-17 | Pressure measuring joint and pressure measuring system |
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| CN113776726B true CN113776726B (en) | 2023-11-24 |
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| CN113776726A (en) | 2021-12-10 |
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