CN220380673U - Joint for diaphragm pressure instrument inspection - Google Patents
Joint for diaphragm pressure instrument inspection Download PDFInfo
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- CN220380673U CN220380673U CN202223519009.2U CN202223519009U CN220380673U CN 220380673 U CN220380673 U CN 220380673U CN 202223519009 U CN202223519009 U CN 202223519009U CN 220380673 U CN220380673 U CN 220380673U
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- 238000007689 inspection Methods 0.000 title description 6
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 210000001503 joint Anatomy 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000012795 verification Methods 0.000 description 34
- 238000013461 design Methods 0.000 description 14
- 238000001514 detection method Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model discloses a joint for testing a diaphragm pressure instrument, which relates to the field of diaphragm pressure meter test and comprises a threaded joint, wherein the top end of the threaded joint is connected with a butt joint sealing joint, the bottom end of the threaded joint is connected with a spanner clamping port, and one end, far away from the threaded joint, of the spanner clamping port is connected with a pressure end joint piece used for being connected with a diaphragm pressure meter. The connector has the characteristics of novel structure, practical function, simplicity, practicability, convenience and quickness in use and the like.
Description
Technical Field
The utility model relates to the field of diaphragm pressure gauge inspection, in particular to a joint for diaphragm pressure gauge inspection.
Background
In the production practice of food engineering and the like, the diaphragm seal pressure gauge and the diaphragm pressure transmitter are required to be subjected to metering verification and traceability. The diaphragm seal pressure gauge interface used in a general factory cannot be matched with a pressure calibrator used for verifying the pressure gauge in China, and as no special connecting tooling fitting for the sanitary diaphragm pressure gauge is used for connecting the diaphragm pressure gauge with the pressure calibrator in China at present, the calibration work of the sanitary diaphragm pressure gauge is difficult to normally carry out.
In real practice, the verification of the diaphragm seal pressure gauge exists:
1. the engineer is required to disassemble the diaphragm sealing structure of the pressure gauge and then carry out connection test, so that the operation is complex, an internal pressure layer can be influenced, larger errors occur in detection, and the verification result of diaphragm pressure measurement equipment is influenced.
2. The joint commonly used for detection is manufactured by welding interfaces of different types, but for the existing technical problems, firstly, the internal aperture and the joint size are overlarge, the transition part is not smooth, the welding effect is poor, the sealing performance is poor due to the conditions of welding omission and the like, and the verification effect is influenced; secondly, if the joints with various sizes are welded to achieve complete sealing connection, the efficiency is extremely low, the cost is high, and the production detection practice is not facilitated; thirdly, the standard components are used for welding after cutting in the traditional factory, the spliced zero-time joint is overlong and is not in the same horizontal plane with the standard pressure gauge used for verification, so that the pressure difference in height is generated, and the verification and calibration results are affected.
3. The processing parts connected by the pipelines are used for partial matching, so that the technical problems are that the internal cavity is too large, the pressure is unstable during verification, the pressure is exerted, time and labor are wasted during the verification, meanwhile, the pipe wall is thinner, and the pressure bearing capacity is poor; secondly, only the chuck joint with a single model can be used as a joint of a diaphragm pressure gauge, the size and the structure are not complete, the condition of various models cannot be dealt with during detection, verification of various pressure gauges cannot be completed, and particularly the joint of a German standard sanitary threaded pipe and an international standard flange belongs to a blank lacking state.
Disclosure of Invention
The utility model aims to provide a joint for testing a diaphragm pressure instrument, which has the characteristics of novel structure, practical function, simplicity, practicability, convenience and rapidness in use and the like.
The aim of the utility model is realized by the following technical scheme:
the joint for testing the diaphragm pressure instrument comprises a threaded joint, wherein the top end of the threaded joint is connected with a butt joint sealing joint, the bottom end of the threaded joint is connected with a spanner clamping port, and one end, far away from the threaded joint, of the spanner clamping port is connected with a pressure end joint piece used for being connected with a diaphragm pressure gauge;
the pressure end socket piece comprises a connecting disc seat, one end of the connecting disc seat is connected with a connecting boss, and one end of the connecting boss, which is far away from the connecting disc seat, is connected with the wrench clamping opening; the sealing joint, the threaded connector, the wrench clamping opening, the connecting boss and the connecting disc seat are provided with pressure guide holes in a penetrating way; or alternatively
The pressure end connector comprises a sanitary threaded pipe joint, one end of the sanitary threaded pipe joint is connected with the wrench clamping opening, and the other end of the sanitary threaded pipe joint is provided with a sealing groove; the sealing joint, the threaded joint and the sanitary threaded pipe joint are provided with pressure guide holes in a penetrating way; or alternatively
The pressure end socket piece comprises a chuck interface, one end of the chuck interface is connected with the wrench clamping opening, and the other end of the chuck interface is provided with a sealing groove; the sealing joint, the threaded interface and the chuck interface are provided with pressure guide holes in a penetrating way;
the pressure guide hole is changed from a bottom hole to an extremely fine hollow; the inside of the pressure end connector is designed into a variable diameter structure and is connected to the pressure guide hole through conical transition; the pressure guide hole penetrates through the pressure end connector piece, the spanner clamping port, the threaded connector and the sealing connector from the tapered transitional narrow end at the bottom end to the top end of the sealing connector; the sealing joint can extend into the pressure checking instrument interface to compress the sealing rubber ring so as to ensure the air tightness.
Preferably, a plurality of screw holes are formed in the periphery of the connecting disc seat.
The beneficial effects of the utility model are as follows: the connector is improved aiming at the problems existing in the detection of the existing diaphragm seal pressure gauge, has reasonable design and compact structure, can conveniently, stably and quickly carry out verification and calibration, solves the verification difficulty of the diaphragm pressure gauge in metering practice, and also solves the key problems of poor tightness, low production efficiency, detection pressure difference and low pressure bearing capacity of the existing diaphragm connector; the pressure end connector of the connector can adopt a complete set of combination mode, can help a metrological verification personnel to select a proper connector for auxiliary metrological verification and calibration in a targeted mode, and covers the types of diaphragm pressure gauges of all types in production, so that the working practice of metrological detection is facilitated, verification flow is simplified, verification efficiency is improved, and the reliability of verification results of diaphragm sealing pressure instruments is improved.
Drawings
FIG. 1 is a schematic diagram of a flange interface of a joint for testing a diaphragm pressure gauge according to the present utility model;
FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1 in accordance with the present utility model;
FIG. 3 is a schematic view of the structure of a sanitary threaded pipe joint of the joint for testing a diaphragm pressure instrument of the present utility model;
FIG. 4 is a schematic cross-sectional view of B-B of FIG. 3 in accordance with the present utility model;
FIG. 5 is a schematic view of a chuck interface structure of a joint for testing a diaphragm pressure gauge according to the present utility model;
FIG. 6 is a schematic cross-sectional view of the C-C of FIG. 5 in accordance with the present utility model;
in the figure, a 1-threaded interface, a 2-butt sealing joint, a 3-wrench clamping port, a 4-disc receiving seat, a 41-connecting boss and a 42-screw hole.
Detailed Description
For the purpose of making the technical solution and advantages of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model. It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
As shown in fig. 1 to 6, in order to overcome some problems in the prior art, the utility model provides a joint for testing a diaphragm pressure instrument, which has the characteristics of novel structure, practical function, simplicity, practicability and the like. The joint comprises a threaded connector 1 in the whole design, wherein the top end of the threaded connector 1 is connected with a butt joint sealing joint 2, the bottom end of the threaded connector 1 is connected with a spanner clamping port 3, and one end, far away from the threaded connector 1, of the spanner clamping port 3 is connected with a pressure end connector for being connected with a diaphragm pressure gauge; different diaphragm pressure instruments can be connected by adopting different pressure end connectors, and further, the relevant parameter performances of the different diaphragm pressure instruments are checked.
Because the pressure gauges with different joint types and sizes exist during measurement tracing and calibration, or the pressure gauges are carried during field detection, the matched joints are selected according to the joint sizes of the pressure gauges to connect, and then the verification process is completed. A single joint or a single type joint cannot cover all types and sizes, so that the situation of no matching is caused, and the verification requirement of the diaphragm pressure gauge required in actual production cannot be met; different pressure tip interfaces have been designed to address this problem.
In embodiment 1, as shown in fig. 1 and 2, the pressure end socket includes a connection pad 4, one end of the connection pad 4 is connected with a connection boss 41, and one end of the connection boss 41 away from the connection pad 4 is connected with a wrench socket 3; and a pressure guide hole is formed through the sealing joint 2, the threaded connector 1, the spanner clamping port 3 and the pressure end connector (the connecting boss 41 and the connecting disc seat 4); a plurality of screw holes 42 are also formed around the connecting disc seat 4, and the joint designed in this way is a flange type joint. When the method is implemented, the pressure end connector of the connector is aligned with the interface end of the diaphragm pressure instrument to be detected, and the quasi-diaphragm pressure gauge is tightly connected with the pressure end connector of the connector, so that the performance of relevant parameters of the diaphragm pressure instrument can be conveniently checked. Here, the diaphragm pressure gauge is a prior art, and the connection between the pressure end connector (the connection boss 41 and the connection pad 4) of the connector and the pressure inlet port designed by the diaphragm pressure gauge is possible, so that the inlet port of the diaphragm pressure gauge is not described in detail, only the pressure end connector is described, and the pressure end connector and the pressure inlet port designed by the diaphragm pressure gauge can be connected in a sealing manner. The joint design structure is connected with the flange type diaphragm seal pressure gauge in a matching way, so that the joint design structure can be directly connected with the pressure gauge calibrator for verification in a convenient and quick way, and therefore accurate and reliable metering verification calibration work is completed for the diaphragm pressure gauge.
In embodiment 2, as shown in fig. 3 and 4, the pressure end connector is different from the pressure end connector in embodiment 1, and the designed pressure end connector comprises a sanitary threaded pipe joint, one end of the sanitary threaded pipe joint is connected with the wrench clamping port 3, and the other end of the sanitary threaded pipe joint is provided with a sealing groove so as to facilitate connection inspection and ensure connection tightness thereof; and the sealing joint 2, the threaded joint 1 and the sanitary threaded pipe joint are penetrated and provided with pressure guide holes, when in inspection, the pressure guide holes are used for introducing air pressure to the diaphragm pressure instrument to inspect the performance of relevant parameters of the calibration instrument, the joint at the moment is a sanitary threaded pipe joint, and when in implementation, the pressure end joint piece is in sealing connection with a pressure inlet port designed by the diaphragm pressure instrument. The joint design structure is in matched connection with the sanitary threaded tubular diaphragm seal pressure gauge, so that the joint design structure can be directly connected with a pressure gauge calibrator for verification conveniently and quickly, and therefore accurate and reliable metering verification calibration work is completed for the diaphragm pressure gauge.
In embodiment 3, as shown in fig. 5 and 6, the pressure end interface is different from the pressure end interface in embodiment 1 and embodiment 2, and the end interface adopted in the implementation process comprises a chuck interface, one end of the chuck interface is connected with the wrench clamping port 3, and the other end of the chuck interface is also provided with a sealing groove, so that the pressure end interface is convenient for testing instruments different from those in embodiment 1 and embodiment 2, and the sealing performance of the joint is ensured; meanwhile, the pressure guide hole is formed through the sealing joint 2, the threaded joint 1 and the chuck joint, when the pressure guide hole is used for checking the performance of relevant parameters of the calibration instrument by introducing air pressure into the diaphragm pressure instrument, the joint is the chuck joint, and when the pressure end joint piece is used for sealing connection with a pressure inlet port designed by the diaphragm pressure instrument. The joint design structure is in matched connection with the chuck type diaphragm seal pressure gauge, so that the joint design structure can be directly connected with the pressure gauge calibrator for verification conveniently and quickly, and therefore accurate and reliable metering verification calibration work is completed for the diaphragm pressure gauge.
Further, three sets of different types of connectors are provided, 4 types of connectors of different sizes commonly used in each set, for a total of 12, according to the different types of diaphragm gauges that can be connected. For different groups of joints, the diaphragm pressure gauge interfaces are divided into flange interfaces, sanitary threaded pipe interfaces and chuck interfaces and are used for being connected with pressure gauges of different types, and for the pressure gauge interfaces of different sizes, the utility model provides four groups of joints of different sizes to match all common size specifications encountered by production practice and metering detection, as shown in table 1:
TABLE 1
| Chuck interface | DN32 | DN40 | DN50 | DN65 |
| Sanitary screwed pipe joint | DN25 | DN32 | DN40 | DN50 |
| Flange joint | DN25 | DN40 | DN50 | DN80 |
The joint is of a monolithic structure, the bottom of the joint is a diaphragm pressure gauge interface, the whole structure is a pressure end interface piece, the pressure end interface piece enumerates the specific 3 embodiments in the utility model, namely a flange interface, a sanitary threaded pipe interface and a chuck interface, the bottom end of each interface, namely one end far away from the threaded interface, is provided with an annular sealing groove, the inside of the interface is of a variable diameter structure design, and the pressure end interface piece is connected to a pressure guide hole through conical transition; the pressure guide hole starts from the conical transition narrow end at the bottom end to the top end of the sealing head and penetrates through the whole joint structure to be communicated;
wherein, the flange type interface is provided with four symmetrical screw holes 42 for connection according to the standard; the connecting disc seat 4 of the pressure end connector of the design joint, namely the flange, is provided with the connecting boss 41 for transition due to the large difference between the sizes of the two ends of the flange, so that the structural strength is enhanced.
The annular sealing groove at the bottom end of the pressure gauge interface of the connector can strengthen the combined tightness by using the sealing rubber ring during connection. The outer diameter of the large end of the bottom is designed according to the standard referenced by the joint of the diaphragm pressure gauge, and the bottom diameter of the conical transition space at the inner diameter is larger than Mb value (the effective diameter of the diaphragm pressure gauge) so as to prevent the bottom of the joint from being in hard contact with the diaphragm to damage the diaphragm.
The middle part of the joint is provided with a spanner clamping port 3 which is used as a connecting part of a diaphragm pressure gauge interface and a calibrator threaded interface, so that the disassembly is convenient; the upper part of the joint is an M20 x 1.5 national standard threaded interface 1 which is used for being connected with a pressure checking table or a checking instrument; the top end is provided with a butt joint sealing head 2 which can penetrate into the pressure checking instrument interface to compress the sealing rubber ring, so that the air tightness is ensured; the pressure guide hole for air guide pressure penetrates through the connector and is transited to the extremely fine hollow pressure guide hole through the reducing of the bottom hole, so that the size of an internal cavity is reduced, the large volume of the cavity is avoided, and unstable pressure caused by air compression during pressurizing is reduced; secondly, the gas required to be pressurized is reduced, the amount of the gas pumped in by the pressurizing is reduced, and time and labor are saved for operators; meanwhile, the outer diameter is determined, and the wall thickness can be increased under the condition that the volume of the inner cavity is reduced, so that the maximum bearing capacity of the joint is improved. The whole structural design of the connector furthest reduces the axial length, except the part connected with the pressure gauge body or the checking table, only has a wrench clamping port 3 of 6mm, and has no redundant circular tube channel, thereby avoiding pressure difference caused by the gravity influence of a medium when the pressure interface of the standard device and the pressure gauge interface to be checked are not at the same height.
Further, when verifying a diaphragm pressure gauge or a diaphragm pressure transmitter, firstly determining the type (sanitary threaded pipe type, chuck type or flange type) and the joint size of the diaphragm pressure gauge, and selecting the joint type (different pressure end connectors) which are required to be matched from a set of multiple joints; the pressure end connector of the joint is then connected with a diaphragm pressure gauge
(1) Flange type: and attaching the pressure gauge flange and the joint flange, fixing the pressure gauge flange and the joint flange through screw hole positions, adding bolts and gaskets, and screwing. After connection, a spanner is used for clamping the spanner clamping opening, the M20 x 1.5 national standard threaded interface of the small end of the joint is screwed into the pressure calibrator or the pressure calibration table for screwing, and the butt joint sealing head is tightly pressed against the rubber gasket in the interface of the calibrator. Finally, connecting an etalon pressure gauge for verification or calibration at the other port of the verification table;
(2) Sanitary threaded pipe: adding a rubber gasket into a nut head of the diaphragm pressure gauge, and directly screwing an external thread of the joint in the design into the rubber gasket until the rubber gasket is screwed;
(3) Chuck type: embedding a rubber gasket into a chuck of the joint and a chuck of the pressure gauge, then putting the rubber gasket into a clamp for kneading, and then screwing a screw on the clamp for fixing;
after connection, the operation can be performed according to the requirements of the diaphragm pressure gauge verification rules. And uniformly and slowly boosting from the zero point during detection, and reading the detected representation value when the standard table pointer indicates the corresponding graduation line. The inspected meter housing is then tapped, the number is read again, and the post-tap indication and the tap displacement (difference between the pre-tap indication and the post-tap indication) are recorded. And when the indication value reaches the upper measurement limit, closing a pressure supply valve of the detected meter, cutting off a pressure source, withstand pressure for 3 minutes, and then sequentially carrying out pressure reduction verification point by point until reaching a zero position. The return error and the tapping displacement meet the requirements specified by the verification regulations. And carry out the result record, can dismantle through the spanner clamp mouth with the spanner after the operation is finished, then separate diaphragm manometer and joint: loosening bolts for separation by flanges; the sanitary screwed pipe is directly screwed out; the clamping band is directly opened by the chuck type to be disassembled.
From the design of the connector, the connector is reasonable in design and compact in structure, can conveniently, stably and rapidly conduct verification and calibration, solves the verification difficulty of the diaphragm pressure gauge in metering practice, also overcomes the key problems of poor tightness, low production efficiency, detection pressure difference and low bearing capacity of the existing diaphragm connector, can help metering and calibrating personnel to select proper connectors for auxiliary metering and calibration in a targeted manner, and covers the types of the diaphragm pressure gauge of all types in production, thereby facilitating the working practice of metering and detection, simplifying the verification process, improving the verification efficiency and improving the reliability of the verification result of the diaphragm sealing pressure gauge.
The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the embodiments in the above description, and various simple modifications can be made to the technical solutions of the present utility model within the scope of the technical concept of the present utility model, and all the simple modifications belong to the protection scope of the present utility model. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. Furthermore, the foregoing description of the preferred embodiment of the utility model is provided for the purpose of limiting the utility model, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model; meanwhile, any combination of various embodiments of the present utility model can be made without departing from the spirit of the present utility model, which should also be regarded as the disclosure of the present utility model.
Claims (2)
1. The joint for testing the diaphragm pressure instrument is characterized by comprising a threaded interface (1), wherein the top end of the threaded interface (1) is connected with a butt joint sealing joint (2), the bottom end of the threaded interface (1) is connected with a spanner clamping port (3), and one end, far away from the threaded interface (1), of the spanner clamping port (3) is connected with a pressure end socket piece used for being connected with a diaphragm pressure gauge;
the pressure end socket piece comprises a connecting disc seat (4), one end of the connecting disc seat (4) is connected with a connecting boss (41), and one end, far away from the connecting disc seat (4), of the connecting boss (41) is connected with the wrench clamping opening (3); the sealing joint (2), the threaded interface (1), the wrench clamping opening (3), the connecting boss (41) and the connecting disc seat (4) are provided with pressure guide holes in a penetrating way; or alternatively
The pressure end socket piece comprises a sanitary threaded pipe joint, one end of the sanitary threaded pipe joint is connected with the spanner clamping port (3), and the other end of the sanitary threaded pipe joint is provided with a sealing groove; the sealing joint (2), the threaded joint (1) and the sanitary threaded pipe joint are provided with pressure guide holes in a penetrating way; or alternatively
The pressure end socket piece comprises a chuck interface, one end of the chuck interface is connected with the spanner clamping port (3), and the other end of the chuck interface is provided with a sealing groove; the sealing joint (2), the threaded interface (1) and the chuck interface are provided with pressure guide holes in a penetrating way;
the pressure guide hole is changed from a bottom hole to an extremely fine hollow; the inside of the pressure end connector is designed into a variable diameter structure and is connected to the pressure guide hole through conical transition; the pressure guide hole penetrates through the pressure end socket piece, the spanner clamping port (3), the threaded interface (1) and the sealing joint (2) from the tapered transition narrow end at the bottom end to the top end of the sealing joint (2); the sealing joint (2) can extend into the pressure checking instrument interface to tightly press the sealing rubber ring so as to ensure air tightness.
2. The joint for testing the diaphragm pressure instrument according to claim 1, wherein a plurality of screw holes (42) are formed around the connecting disc seat (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223519009.2U CN220380673U (en) | 2022-12-28 | 2022-12-28 | Joint for diaphragm pressure instrument inspection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223519009.2U CN220380673U (en) | 2022-12-28 | 2022-12-28 | Joint for diaphragm pressure instrument inspection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220380673U true CN220380673U (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223519009.2U Active CN220380673U (en) | 2022-12-28 | 2022-12-28 | Joint for diaphragm pressure instrument inspection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220380673U (en) |
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2022
- 2022-12-28 CN CN202223519009.2U patent/CN220380673U/en active Active
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