CN111780917A - Absolute pressure gauge - Google Patents
Absolute pressure gauge Download PDFInfo
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- CN111780917A CN111780917A CN202010512343.1A CN202010512343A CN111780917A CN 111780917 A CN111780917 A CN 111780917A CN 202010512343 A CN202010512343 A CN 202010512343A CN 111780917 A CN111780917 A CN 111780917A
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- Prior art keywords
- hole
- diaphragm
- fixing plate
- absolute pressure
- joint
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
- G01L7/084—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type with mechanical transmitting or indicating means
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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
- G01L19/0015—Fluidic connecting means using switching means
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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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0618—Overload protection
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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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0627—Protection against aggressive medium in general
- G01L19/0654—Protection against aggressive medium in general against moisture or humidity
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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
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/10—Means for indicating or recording, e.g. for remote indication mechanical
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
- G01L7/082—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type construction or mounting of diaphragms
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A panel and a sealing ring are sequentially fixed on the front end face of a watch case by a surface ring, a movement is communicated with a square connector, the square connector is fixed with the watch case, the upper end of a guide rod is connected with the movement, the lower end of the guide rod is connected with a corrugated pipe inside the square connector by a universal joint, one side face of the square connector is provided with a vacuum valve group for vacuumizing, an inner hole of the vacuum valve group is communicated with an inner cavity of the square connector, the lower end of the square connector is fixed at the center of an upper flange, the lower end of the corrugated pipe penetrates through a lower through hole of the square connector and the center of the upper flange and is in threaded connection with a corrugated diaphragm, the diaphragm has elasticity, annular convex teeth which are uniformly distributed and take the center of the upper flange as the center of a circle are arranged on the lower surface of the upper flange, the lower flange and. The absolute pressure gauge provided by the invention has the advantages that the absolute pressure gauge is more convenient to vacuumize, and the diaphragm cannot be damaged due to overpressure.
Description
Technical Field
The invention relates to the technical field of pressure gauges, in particular to an absolute pressure gauge.
Background
The pressure of the gas indicated by the pressure gauge does not represent the actual pressure of the gas, but exceeds the atmospheric pressure, the gauge pressure is calculated by taking the atmospheric pressure as zero, the absolute pressure refers to the pressure directly acting on the surface of the container or the object, and the sum of the gauge pressure and the atmospheric pressure is the absolute pressure.
The diaphragm of the absolute pressure meter in the prior art divides an in-meter pressure cavity into a vacuum cavity and a measuring medium cavity, the measuring medium compresses the diaphragm, a push rod on the diaphragm generates displacement along with the diaphragm, the push rod transmits displacement variables to a machine core of the absolute pressure meter, and then the pressure is measured through the rotation of a pointer. According to the traditional absolute pressure gauge, a capillary tube is welded in a vacuum cavity for vacuumizing, and due to the fact that the capillary tube is thin in wall, welding is difficult, and repairing is difficult or even scrapped when abnormality exists. The pressure of a measured medium of the absolute pressure gauge is usually less than one atmosphere, the range of the diaphragm is small, the diaphragm can be in an overpressure state after the vacuum cavity is vacuumized, and if the deformation of the diaphragm is not limited and protected, the diaphragm can be permanently shaped and deformed, even breaks, and loses the measuring function.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an absolute pressure meter.
The invention provides the following technical scheme: an absolute pressure meter, comprising a dial plate system and a measuring system, the measuring system comprising: the device comprises a universal joint, a square joint, a vacuum valve group, a corrugated pipe, an upper flange, a diaphragm, a lower flange and a threaded joint;
the square joint in the prism shape is provided with a supporting plate connected with a dial plate system, the corrugated pipe is positioned in an internal cylindrical cavity of the square joint, the universal joint penetrates through a through hole above the square joint and an internal channel of the corrugated pipe and is fixed at the lower end of the corrugated pipe, the lower end of the square joint is fixed at the center of the disc-shaped upper flange, and one side surface of the square joint is provided with an air hole communicated with the internal cavity of the square joint and a vacuum valve group connected with the air hole;
the lower end of the corrugated pipe penetrates through a through hole below the lower joint and the center of the upper flange and is in threaded connection with a corrugated diaphragm, the diaphragm has elasticity, the lower surface of the upper flange consists of a plurality of annular flat bearing surfaces which are uniformly distributed by taking the center of the flange as the circle center, each flat bearing surface is provided with an annular convex tooth, each flat bearing surface has a height difference, and the annular convex teeth can be matched with corrugated grooves of the diaphragm; the lower surface of the upper flange is spaced from the diaphragm, the diaphragm is clamped between the disc-shaped lower flange and the upper flange, a groove is formed above the lower flange and forms a measuring cavity with the diaphragm, the threaded joint penetrates through the center below the lower flange, and a through hole in the threaded joint is communicated with the measuring cavity.
Further, the dial plate system comprises a display system and a measurement feedback system, wherein the display system comprises a face ring, a panel, a sealing ring and a watch case; the face ring fixes the panel and the sealing ring on the front end face of the watchcase in sequence, and the supporting plate of the measuring system extends into the display system from a gap below the watchcase and is fixed with the back end face of the watchcase.
Furthermore, the measurement feedback system comprises a guide rod, a pointer, a movement and a support; inside the watch case, a movement for controlling the rotation of the pointer is fixed on the support plate of the measuring system through a support, a dial plate is fixed on the movement, the upper end of the guide rod of the measurement feedback system is connected with the movement, and the lower end of the guide rod is locked on a universal joint of the measuring system.
Furthermore, the display system also comprises a sealing cover, wherein an oil filling hole is arranged above the watch case, and the sealing cover is matched with the oil filling hole.
Furthermore, the movement comprises a first fixing plate, a second fixing plate, a dial seat, a locking block, a pull rod, a connecting rod, a swing rod, a needle seat and a rotating shaft;
the first fixing plate and the second fixing plate are parallel to each other, the rotating shaft for rotating the swing rod is arranged between the first fixing plate and the second fixing plate, and the first fixing plate is fixed on the rear end face of the watch case; the dial plate is fixed on the dial plate seat, one end of the needle seat penetrates through the second fixing plate, the other end of the needle seat is provided with a gear and is positioned between the first fixing plate and the second fixing plate, one side of the oscillating rod is meshed with the gear of the needle seat, and the other side of the oscillating rod is connected with the lower end of the connecting rod; one end of the pull rod can rotate around the support column above the position between the first fixing plate and the second fixing plate, the other end of the pull rod is connected with the upper end of the connecting rod, a locking block for fixing the guide rod is arranged on the pull rod, and the pull rod, the connecting rod and the oscillating rod form a double-rocker mechanism; and a strip-shaped groove is formed in the position where the oscillating bar and the pull rod are connected with the connecting rod.
Further, the vacuum valve group comprises a valve body; the valve body is internally provided with a first pore passage communicated with the air hole, and the first pore passage consists of a first-stage hole, a second-stage hole, a third-stage hole and a fourth-stage hole, wherein the diameters of the first-stage hole, the second-stage hole, the third-stage hole and the fourth-stage hole are gradually increased.
Furthermore, the vacuum valve group also comprises a valve core; the cylindrical valve core is inserted into the first pore passage, a cylinder with the diameter smaller than that of the valve core main body is arranged on the end face of the front half part of the valve core, the cylinder penetrates through the sealing ring and then is inserted into the first-stage hole of the first pore passage, the sealing ring is pressed at the joint of the first-stage hole and the second-stage hole by the end face of the front end of the cylinder of the valve core, and threads are arranged on the side face of the rear half part of the valve core.
Further, the vacuum valve group still includes the positioning disk, the positioning disk comprises the cavity cylinder that the diameter is different, and the cylinder that the diameter is less inserts third level hole, and still is equipped with the sealing washer between the junction in the less main part terminal surface of diameter and second level hole and third level hole, and the great cylinder card of diameter is in the junction in third level hole and fourth level hole.
Furthermore, the vacuum valve group also comprises a threaded sleeve and a locking nut; the outer side of the threaded sleeve is matched with the inner thread of the fourth-stage hole, and the front end of the threaded sleeve is contacted with the end face of the larger cylinder of the positioning disc; the rear half part of the valve core is in threaded connection with the inner side of the threaded sleeve, and the rear end face of the valve core exceeds the surface of the valve body and is matched with the locking nut.
Further, the vacuum valve group also comprises a sealing bolt; the valve body is provided with a second pore passage, the second pore passage consists of two sections of through holes with different diameters, the through hole with the larger diameter is in threaded connection with the sealing bolt, and the through hole with the smaller diameter is intersected with the second-stage hole of the first pore passage.
The invention has the beneficial effects that:
1. the annular convex teeth of the upper flange can be well matched with the deformed diaphragm, and the manufacturing process is good;
2. the upper flange can protect the diaphragm from permanent plastic deformation or rupture under the condition of overhigh pressure, and plays a role in overload protection;
3. the vacuum valve group is compact in structure and convenient to maintain; the vacuum valve group is opened and closed rapidly, the vacuumizing is more convenient, the sealing performance is good, and compared with a traditional vacuumizing capillary tube, the service life is longer.
Drawings
FIG. 1 is an exploded view of one embodiment of the present invention;
FIG. 2 is a front view of one embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along plane A-A of the embodiment of FIG. 2;
FIG. 4 is a cross-sectional view taken along plane B-B of the embodiment of FIG. 2;
FIG. 5 is a vertical cross-sectional view of one embodiment of the present invention;
figure 6 is a schematic view of the cartridge of the embodiment of figure 1;
fig. 7 is a cross-sectional view of the upper flange and diaphragm of the embodiment of fig. 1.
Reference numerals: 1-sealing cover; 2-a watch case; 3-a guide rod; 4-a universal joint; 5-a machine core; 6-square joint; 7-a valve group; 8-a bellows; 9-upper flange; 10-a membrane; 11-a lower flange; 12 a threaded joint; 13-a dial plate; 14-a pointer; 15-sealing ring; 16-a panel; 17-a doughnut; 18-a pillar; 51-a first fixing plate; 52-a second fixing plate; 53-dial seat; 54-a locking block; 55-a pull rod; 56-connecting rod; 57-oscillating bar; 58-needle seat; 59-a rotating shaft; 6-square joint; 61-a support plate; 62-pores; 71-a valve body; 72-sealing bolt; 73-a valve core; 74-a threaded sleeve; 75-a positioning plate; 76-a lock nut; 77 — a first porthole; 78-second porthole.
Detailed Description
The embodiments of the present invention will be described in more detail with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement the embodiments of the present invention after studying the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an absolute pressure meter as shown in figures 1-4, which consists of a dial plate system and a measuring system, wherein the measuring system comprises: the device comprises a universal joint 4, a square joint 6, a vacuum valve group 7, a corrugated pipe 8, an upper flange 9, a diaphragm 10, a lower flange 11 and a threaded joint 12;
the prismatic square joint 6 is provided with a supporting plate 61 connected with a dial plate system, the corrugated pipe 8 is positioned in an internal cylindrical cavity of the square joint 6, the universal joint 4 passes through a through hole above the square joint 6 and an internal channel of the corrugated pipe 8 and is fixed at the lower end of the corrugated pipe 8, the lower end of the square joint 6 is fixed at the center of the disc-shaped upper flange 9, one side surface of the square joint 6 is provided with an air hole 62 communicated with the internal cavity of the square joint and a vacuum valve group 7 connected with the air hole 62;
the lower end of the corrugated pipe 8 penetrates through a through hole below the square joint 6 and the center of the upper flange 9 and is in threaded connection with a corrugated diaphragm 10, the diaphragm 10 has elasticity, the lower surface of the upper flange 9 consists of a plurality of annular flat bearing surfaces which are uniformly distributed by taking the center of the flange 9 as the circle center, each flat bearing surface is provided with an annular convex tooth, each flat bearing surface has a height difference, and the annular convex teeth can be matched with a corrugated groove of the diaphragm 10; the lower surface of the upper flange 9 is spaced from the diaphragm 10, the diaphragm 10 is clamped between the disc-shaped lower flange 11 and the upper flange 9, a groove is formed above the lower flange 11 and forms a measuring cavity with the diaphragm 10, the threaded joint 12 penetrates through the center below the lower flange 11, and a through hole in the threaded joint 12 is communicated with the measuring cavity.
The working process of the invention is as follows: as shown in fig. 3, 4 and 7, a worker connects the vacuum valve group 7 to a vacuum tank, a vacuum cavity is formed by a cavity formed by sealing the diaphragm 10, the upper flange 9, the bellows 8, the square joint 6 and the vacuum valve group 7, a measurement cavity is formed by a groove above the lower flange 11 and the lower surface of the diaphragm 10, and the vacuum cavity is communicated with the vacuum tank. The measurement medium may be a gas and the gas pressure is less than one atmosphere. The threaded joint 12 is connected with a pipeline for transmitting the measuring medium, and when the vacuum pumping is performed, a pipeline valve for transmitting the measuring medium is closed, so that the measuring medium is prevented from entering the measuring cavity. After the vacuum cavity is vacuumized, the vacuum valve group 7 is sealed, a pipeline valve for transmitting a measuring medium is opened, the measuring medium enters the measuring cavity through a pore passage in the threaded connector 12, the measuring cavity and the vacuum cavity have air pressure difference, the measuring medium presses the diaphragm 10 to move upwards, and the diaphragm 10 drives the corrugated pipe 8 and the universal joint 4 to move upwards.
Specifically, as shown in fig. 7, the diaphragm 10 is elastic and corrugated, the lower surface of the upper flange 9 is composed of a plurality of annular flat bearing surfaces uniformly distributed around the center of the flange 9, and each flat bearing surface is provided with an annular convex tooth. Each flat bearing surface has a height difference, so that the deformed curved surface of the diaphragm 10 can be well matched with the lower surface of the upper flange 9. When the vacuum cavity is vacuumized, the measurement cavity is not filled with a measurement medium, atmospheric pressure exists in the measurement cavity, and the pressure film 10 is pressed by the atmospheric pressure to deform the pressure film or even contact the lower surface of the upper flange 9. At this time, the corrugated groove of the deformed diaphragm 10 is matched with the annular convex tooth, the annular convex tooth prevents the diaphragm 10 from being continuously deformed upwards, and the annular convex tooth plays a role in protecting the diaphragm 10. If the deformation of the membrane 10 is not limited and protected, the membrane 10 may be permanently deformed and even broken, and the measuring function is lost.
Specifically, as shown in fig. 1, the dial plate system of the present invention includes a display system and a measurement feedback system, wherein the display system includes a bezel 17, a panel 16, a seal ring 15, and a case 2; the side surface of the face ring 17 is provided with a plurality of clamping grooves, the front end surface of the watch case 2 is provided with a buckle corresponding to the clamping grooves, the face ring 17 fixes the panel 16 and the sealing ring 15 on the front end surface of the watch case 2 in sequence, the face ring 17 is screwed on the watch case 2 through the buckle and the clamping grooves, and the sealing ring 15 can ensure the sealing performance of a cavity formed by the watch case 2 and the face ring 17. Said support plate 61 of the measuring system is connected to the watch case 2 of the display system.
Specifically, as shown in fig. 1, 3 and 4, the measurement feedback system of the present invention includes a guide rod 3, a pointer 14, a movement 5, and a support column 18; inside said case 2, movement 5, which controls the rotation of hands 14, is fixed to said support plate 61 of the measuring system by means of a support 18; the upper end of the guide rod 3 of the measurement feedback system is connected with the machine core 5, and the lower end of the guide rod is locked on a universal joint 4 of the measurement system.
Specifically, as shown in fig. 1, the display system of the dial plate system further includes a sealing cover 1, an oil filling hole is provided above the watch case 2, and the sealing cover 1 is matched with the oil filling hole. When the absolute pressure gauge is in a vibration working position, the absolute pressure gauge needs to be filled with oil, the oil enters the meter shell 2 through the oil filling hole, the oil normally fills the volume of 2/3 to 3/4 in the meter shell 2, the vibration of the movement 5 and the abrasion caused by the vibration are reduced, and the sealing cover 1 can ensure that the oil does not flow out of the oil filling hole. The square connector 6 and the lower gap of the watchcase 2 are provided with a sealing body, so that oil is prevented from flowing out of the connection.
Specifically, the material of the panel 16 may be glass.
One specific embodiment: as shown in fig. 3, 4 and 6, the movement 5 includes a first fixing plate 51, a second fixing plate 52, a dial seat 53, a locking block 54, a pull rod 55, a connecting rod 56, a swing rod 57, a needle seat 58 and a rotating shaft 59; the first fixing plate 51 and the second fixing plate 52 are parallel to each other, and the rotating shaft 59 for rotating the swing link 57 is disposed between them, and the first fixing plate 51 is fixed on the back end surface of the watch case 2. The dial 13 is fixed on the dial seat 53, one end of the needle seat 58 penetrates through the second fixing plate 52, the other end of the needle seat is provided with a gear and is positioned between the first fixing plate 51 and the second fixing plate 52, one side of the swing rod 57 is meshed with the gear of the needle seat 58, and the other side of the swing rod is connected with the lower end of the connecting rod 56.
One end of the pull rod 55 can rotate around the pillar above the first fixing plate 51 and the second fixing plate 52, the other end of the pull rod 55 is connected with the upper end of the connecting rod 56, the locking block 54 for fixing the guide rod 3 is arranged on the pull rod 55, and the pull rod 55, the connecting rod 56 and the swing rod 57 form a double-rocker mechanism. A strip-shaped groove is formed in the position where the oscillating bar 57 and the pull rod 55 are connected with the connecting rod 56, and after the guide rod 3 is fixed on the locking block 54, the position relation between the connecting rod 56 and the oscillating bar 57 and the position relation between the connecting rod 56 and the pull rod 55 are adjusted through the strip-shaped groove.
During measurement, the displacement of the diaphragm 10 is transmitted to the guide rod 3 through the bellows 8 and the universal joint 4, the guide rod 3 pulls the pull rod 55 to swing upwards, the pull rod 55 drives the swing rod 57 to rotate through the connecting rod 56, and the needle seat 58 meshed with the swing rod 57 drives the pointer 14 to rotate. The amount of displacement of the diaphragm 10 determines the angle of rotation of the pointer 14.
A more specific embodiment: as shown in fig. 5, the vacuum valve set includes a valve body 71, a sealing bolt 72, a valve core 73, a threaded sleeve 74, a positioning disc 75, and a lock nut 76; the valve body 71 is internally provided with a first pore passage 77 communicated with the air hole 62, the first pore passage 77 consists of a first-stage hole, a second-stage hole, a third-stage hole and a fourth-stage hole, the diameters of which are gradually increased, and the fourth-stage hole of the first pore passage 77 is convenient for placing the valve core 73 and the thread sleeve 74. The cylindrical valve core 73 is inserted into the first hole channel 77, a cylinder with a diameter smaller than that of the main body of the valve core 73 is arranged on the end face of the front half part of the valve core 73, the cylinder penetrates through the sealing ring and is inserted into the first-stage hole of the first hole channel 77, the sealing ring is extruded at the connecting position of the first-stage hole and the second-stage hole by the end face of the main body of the valve core 73, and threads are arranged on the side face of the rear half part of the valve core 73.
The positioning disc 75 is composed of hollow cylinders with different diameters, the cylinder with the smaller diameter is inserted into the third-stage hole of the first hole channel 77, and a sealing ring is further arranged between the end face of the smaller cylinder of the positioning disc 75 and the joint of the second-stage hole and the third-stage hole. The outer side of the threaded sleeve 74 is in threaded fit with the inner side of the fourth-stage hole, and the front end of the threaded sleeve 74 abuts against the end face of the larger cylinder of the positioning disc 75, so that the front end of the smaller cylinder of the positioning disc 75 presses the sealing ring until the cylinder with the larger diameter of the positioning disc 75 is clamped at the joint of the third-stage hole and the fourth-stage hole of the first duct 77.
The rear half part of the valve core 73 is in threaded connection with the inner side of the threaded sleeve 74, and the rear end face of the valve core 73 exceeds the surface of the valve body 71 and is matched with the locking nut 76. The valve body 71 is provided with a second duct 78, the second duct 78 is composed of two sections of through holes with different diameters, the through hole with the larger diameter is in threaded connection with the sealing bolt 72, and the through hole with the smaller diameter is intersected with the second-stage hole of the first duct 77.
The working principle of the vacuum valve group 7 of the invention is as follows: the worker welds the vacuum valve group 7 on the side of the air hole 62 of the square joint 6 to ensure that the first hole 77 is communicated with the air hole. As shown in fig. 5, the sealing plug 72 of the vacuum valve set 7 is unscrewed, the second channel 72 is connected to the vacuum tank through a pipe, and the locking nut 76 and the valve core 73 are unscrewed to ensure that the valve core 73 does not block the second channel 78. The vacuum chamber is communicated with a vacuum tank, after the vacuum is pumped out, the valve core 73 is rotated, and the valve core 73 is matched with the internal thread of the thread sleeve 74 to advance. The valve core 73 seals the intersection of the first duct 77 and the second duct 78, then a column with a diameter smaller than that of the main body of the valve core 73 penetrates through the sealing ring and enters the first-stage hole of the first duct 77, and the front end face of the main body of the valve core 73 presses the sealing ring to seal the first-stage hole.
The sealing ring at the tertiary orifice further ensures the tightness between said 73 and the first duct 77. And (3) screwing a locking nut 76 and the rear end of the valve core 73 until the locking nut 76 is clamped on the surface of the valve body 71, and at the moment, the valve core 73 completes the sealing of the vacuum cavity.
The reason why the valve core 73 is screwed and loosened in the inner hole of the threaded sleeve 74 is that the valve core 73 is screwed and loosened in the inner hole of the threaded sleeve 74 many times, the threaded sleeve 74 may have axial play, the front end of the threaded sleeve 74 may leave the end surface of the larger cylinder of the positioning disk 75, and after the external force applied to the positioning disk 75 disappears, the connection between the positioning disk 75 and the sealing ring may be loosened, so that the sealing performance between the valve core 73 and the first duct 77 is affected.
After screwing the valve core 73, the worker can remove the vacuum tank pipe connected to the second port 78 and screw the sealing bolt 72 into the second port 78, thereby further improving the sealing performance of the vacuum chamber.
If the sealing plug 72 does not seal the second port 78, impurities such as dust in the air may enter the second port 78 to damage the surface of the valve element 73, thereby affecting the sealing effect of the valve element 73. Once the valve element 73 is in clearance connection with the first port 77, atmospheric pressure will enter the vacuum chamber, causing an error in the absolute pressure measurement.
Specifically, the threaded joint 12 may be welded to the lower flange 11, the joint between the bellows 8 and the square joint 6 may be sealed by welding, the universal joint 4 may be screwed to the bellows 8, and the strut 18 may be screwed to the square joint 6.
The foregoing is illustrative of embodiments of the present invention and is described in some detail and not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An absolute pressure meter, comprising a dial plate system and a measuring system, the measuring system comprising: the device comprises a universal joint (4), a square joint (6), a vacuum valve group (7), a corrugated pipe (8), an upper flange (9), a diaphragm (10), a lower flange (11) and a threaded joint (12);
the method is characterized in that: the square joint (6) in a prism shape is provided with a supporting plate (61) connected with a dial plate system, the corrugated pipe (8) is positioned in an inner cylindrical cavity of the square joint (6), the universal joint (4) penetrates through a through hole above the square joint (6) and an inner channel of the corrugated pipe (8) and is fixed at the lower end of the corrugated pipe (8), the lower end of the square joint (6) is fixed at the center of a disc-shaped upper flange (9), one side surface of the square joint (6) is provided with an air hole (62) communicated with the inner cavity of the square joint, and a vacuum valve group (7) connected with the air hole (62);
the lower end of the corrugated pipe (8) penetrates through a through hole below the square joint (6) and the center of the upper flange (9) and is in threaded connection with a corrugated diaphragm (10), the diaphragm (10) has elasticity, the lower surface of the upper flange (9) consists of a plurality of annular flat bearing surfaces which are uniformly distributed by taking the center of the flange (9) as the circle center, each flat bearing surface is provided with an annular convex tooth, each flat bearing surface has a height difference, and the annular convex teeth can be matched with a corrugated groove of the diaphragm (10); the diaphragm measuring device is characterized in that a distance exists between the lower surface of the upper flange (9) and the diaphragm (10), the diaphragm (10) is clamped between the disc-shaped lower flange (11) and the upper flange (9), a groove is formed above the lower flange (11), the groove and the diaphragm (10) form a measuring cavity, the threaded joint (12) penetrates through the center below the lower flange (11), and a through hole in the threaded joint (12) is communicated with the measuring cavity.
2. An absolute pressure gauge according to claim 1, wherein: the dial plate system comprises a display system and a measurement feedback system, wherein the display system comprises a face ring (17), a panel (16), a sealing ring (15) and a watch case (2); the panel (16) and the sealing ring (15) are sequentially fixed on the front end face of the watchcase (2) by the face ring (17), and the supporting plate (61) of the measuring system extends into the display system from a gap below the watchcase (2) and is fixed with the rear end face of the watchcase (2).
3. An absolute pressure gauge according to claim 1, wherein: the measurement feedback system comprises a guide rod (3), a pointer (4), a movement (5) and a support (18); in the watch case (2), a movement (5) for controlling a pointer (14) to rotate is fixed on a support plate (61) of a measuring system through a support column (18), a dial (13) is fixed on the movement (5), the upper end of a guide rod (3) of a measuring feedback system is connected with the movement (5), and the lower end of the guide rod is locked on a universal joint (4) of the measuring system.
4. An absolute pressure gauge according to claim 1, wherein: the display system further comprises a sealing cover (1), an oil filling hole is formed in the upper portion of the watch case (2), and the sealing cover (1) is matched with the oil filling hole.
5. An absolute pressure gauge according to claim 1, wherein: the movement (5) comprises a first fixing plate (51), a second fixing plate (52), a dial seat (53), a locking block (54), a pull rod (55), a connecting rod (56), a swing rod (57), a needle seat (58) and a rotating shaft (59);
the first fixing plate (51) and the second fixing plate (52) are parallel to each other, a rotating shaft (59) for rotating the swing rod (57) is arranged between the first fixing plate (51) and the second fixing plate, and the first fixing plate (51) is fixed on the rear end face of the watch case (2); the dial (13) is fixed on the dial seat (53), one end of the needle seat (58) penetrates through the second fixing plate (52), the other end of the needle seat is provided with a gear and is positioned between the first fixing plate (51) and the second fixing plate (52), one side of the swing rod (57) is meshed with the gear of the needle seat (58), and the other side of the swing rod is connected with the lower end of the connecting rod (56); one end of the pull rod (55) can rotate around a support column above the space between the first fixing plate (51) and the second fixing plate (52), the other end of the pull rod is connected with the upper end of the connecting rod (56), a locking block (54) for fixing the guide rod (3) is arranged on the pull rod (55), and the pull rod (55), the connecting rod (56) and the swing rod (57) form a double-rocker mechanism; a strip-shaped groove is formed in the position where the swing rod (57) and the pull rod (55) are connected with the connecting rod (56).
6. An absolute pressure gauge according to claim 1, wherein: the vacuum valve group (7) comprises a valve body (71); the valve body (71) is internally provided with a first pore passage (77) communicated with the air hole (62), and the first pore passage (77) consists of a first-stage hole, a second-stage hole, a third-stage hole and a fourth-stage hole, the diameters of which are gradually increased.
7. An absolute pressure gauge according to claim 6, wherein: the vacuum valve group (7) also comprises a valve core (73); the cylindrical valve core (73) is inserted into the first hole channel (77), a cylinder with the diameter smaller than that of the main body of the valve core (73) is arranged on the end face of the front half part of the valve core (73), the cylinder penetrates through the sealing ring and then is inserted into the first-stage hole of the first hole channel (77), the sealing ring is pressed at the joint of the first-stage hole and the second-stage hole by the end face of the front end of the cylinder of the valve core (73), and threads are arranged on the side face of the rear half part of the valve core (73).
8. An absolute pressure gauge according to claim 6, wherein: vacuum valves (7) still include positioning disk (75), positioning disk (75) comprise the cavity cylinder that the diameter is different, and the less cylinder of diameter inserts third level hole, and still is equipped with the sealing washer between the junction in the less main part terminal surface of diameter and second level hole and third level hole, and the great cylinder card of diameter is in the junction in third level hole and fourth level hole.
9. An absolute pressure gauge according to claim 8, wherein: the vacuum valve group (7) also comprises a threaded sleeve (74) and a locking nut (76); the outer side of the threaded sleeve (74) is matched with the inner thread of a fourth-stage hole, and the front end of the threaded sleeve (74) is in contact with the end surface of a larger cylinder of the positioning disc (75); the rear half part of the valve core (73) is in threaded connection with the inner side of the threaded sleeve (74), and the rear end face of the valve core (73) exceeds the surface of the valve body (71) and is matched with the locking nut (76).
10. An absolute pressure gauge according to claim 6, wherein: the vacuum valve group (7) also comprises a sealing bolt (72); the valve body (71) is provided with a second pore passage (78), the second pore passage (78) is composed of two sections of through holes with different diameters, the through hole with the larger diameter is in threaded connection with the sealing bolt (72), and the through hole with the smaller diameter is intersected with the second-stage hole of the first pore passage (77).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010512343.1A CN111780917A (en) | 2020-06-08 | 2020-06-08 | Absolute pressure gauge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010512343.1A CN111780917A (en) | 2020-06-08 | 2020-06-08 | Absolute pressure gauge |
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| CN111780917A true CN111780917A (en) | 2020-10-16 |
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| CN202010512343.1A Pending CN111780917A (en) | 2020-06-08 | 2020-06-08 | Absolute pressure gauge |
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Inventor after: Chen Yuyi Inventor after: Li Peng Inventor after: Wang Xiaoping Inventor after: Zhou Xingwei Inventor before: Chen Yushuo Inventor before: Li Peng Inventor before: Wang Xiaoping Inventor before: Zhou Xingwei |
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Application publication date: 20201016 |