A pressure regulator for calibrating pressure gauges

Abstract

The utility model relates to pressure instrument check -up equipment technical field discloses a steady voltage supply device for pressure gauge calibration, and the device includes pressure check -up platform and fixed installation in the connecting pipe of pressure check -up platform top, the connecting pipe inside is installed with sealing assembly, and outside is installed with protection subassembly, sealing assembly utilizes second spring abutment limit ring and transmission pipe, drives first sealing ring close -fit pressure gauge bottom, realizes axial self -adaptation sealing, simultaneously utilizes inflation pipe expansion and promotes second sealing ring to stick to pressure gauge lateral wall and realizes radial seal, protection subassembly passes through the cooperation of the inside spring ball of slider and the surface sliding groove of connecting pipe, realizes the quick locking and disassembly of protection cover. The utility model solves the problem that traditional check -up interface sealing adaptability is poor and protection is complicated, has the advantages such as reliable sealing, convenient operation.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure gauge calibration equipment, and in particular to a pressure gauge calibration stabilizing power supply device. Background Technology

[0002] In industrial production and metrological testing, pressure gauges, as crucial testing instruments, require regular calibration to ensure accurate readings. Calibration is typically performed on a pressure calibration bench, which generates a standard pressure source through an internal pressure generation and stabilization system and delivers it to the pressure gauge to be calibrated. To facilitate pressure transmission, the top of the calibration bench usually features a connection interface for mounting the pressure gauge.

[0003] However, existing pressure calibration benches mostly use rigid threaded connections with fixed sealing gaskets. Due to machining tolerances in the thread length of pressure gauge connectors from different manufacturers, or wear due to long-term use, the screw-in depth of the pressure gauge often varies. If screwed in too deeply, the sealing gasket can be damaged; if screwed in too shallowly, an effective end-face seal cannot be formed, leading to high-pressure gas leakage and affecting calibration accuracy. Furthermore, dust or debris easily accumulates at the calibration bench's interfaces when not in use. Existing protective covers are mostly installed using a threaded screw-on method, which is cumbersome and inefficient for operators during frequent disassembly and reassembly. This can even lead to operators abandoning the use of protective covers due to the inconvenience, thus affecting the equipment's lifespan.

[0004] Therefore, this utility model proposes a pressure stabilizing power supply device for pressure gauge calibration to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a pressure stabilizing power supply device for pressure gauge calibration, which aims to improve the problems in the prior art, such as the poor adaptability of the connection interface of the pressure calibration bench to the length tolerance of the pressure gauge connector, resulting in unreliable sealing, and the cumbersome disassembly and assembly of the protective cover, resulting in low ease of use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pressure gauge calibration device, comprising a pressure calibration platform and a connecting pipe fixedly installed on the top of the pressure calibration platform; a sealing component is installed inside the connecting pipe and a protective component is installed outside the connecting pipe; and a fixed shell, a second spring, a limiting ring, a transmission pipe, a first sealing ring, a fixed pipe, a fixed ring, a fixed block, an inflation pipe and a second sealing ring;

[0007] The sealing assembly features a unique construction combining axial floating seal and radial inflation seal. Specifically, the sealing assembly includes a fixed shell fixed to the inner wall of the connecting pipe, a second spring installed on the bottom side inside the fixed shell, a limiting ring abutting the top of the second spring, the limiting ring being connected to the transmission pipe, a first sealing ring being connected to the top of the transmission pipe, and the limiting ring being slidably fitted onto the inner wall of the fixed shell.

[0008] Furthermore, the fixing tube is installed on the inner wall surface of the fixing shell, the fixing ring is provided on the outer side of the fixing tube, the fixing tube and the fixing ring are connected and fixed by the fixing block, the inflation tube is provided between the fixing tube and the fixing ring, and the second sealing ring is provided on the top of the fixing ring; the protective component includes a protective cover sleeved on the top outer surface of the connecting tube, the inner wall of the protective cover is provided with a slider, and the outer surface of the connecting tube is provided with a groove for the slider to be inserted;

[0009] Preferably, a first spring is installed inside the slider in the protective assembly. One end of the first spring abuts against the inside of the slider, and the other end abuts against a locking ball, thereby realizing the elastic locking function through this structure.

[0010] Preferably, the sliding groove surface of the connecting pipe is provided with a specific groove, and the retaining ball can be inserted into the groove under the action of the first spring force to securely position the protective cover on the top of the connecting pipe and prevent accidental detachment;

[0011] Preferably, the inner wall of the groove is configured to compress the retaining ball, forcing the retaining ball to retract inward and compress the first spring, thereby allowing the slider to slide smoothly within the groove until it reaches the locked position;

[0012] Preferably, the first sealing ring is configured such that when pushed by the bottom end face of the pressure gauge, the limiting ring is driven by the transmission tube to slide downward along the inner wall of the fixed shell and compress the second spring, thereby using the spring force to adapt to the installation position of the pressure gauge;

[0013] Preferably, the second spring is configured to generate a rebound force to push the limiting ring, the transmission tube and the first sealing ring upward, so that the top of the first sealing ring is tightly attached to the bottom surface of the pressure gauge to achieve axial sealing and ensure airtightness;

[0014] Preferably, a sealing plug is connected to the side of the inflation tube, and the sealing plug is used to inject gas into the fixed ring in order to control the initiation of the radial seal.

[0015] Preferably, the inflation tube is configured such that, under the action of gas expansion force, it pushes the second sealing ring located at the top of the fixing ring to tightly fit against the outer wall of the bottom of the pressure gauge to achieve radial sealing, providing double sealing protection;

[0016] Preferably, the inner wall of the top of the connecting pipe is threaded for the pressure gauge to be calibrated to be screwed in, ensuring the strength of the mechanical connection;

[0017] Preferably, the first sealing ring is located inside the upper part of the fixed shell, the bottom of the transmission tube is connected to the limiting ring, and the fixing block is located between the fixing tube and the fixing ring. The components are arranged compactly and do not interfere with each other.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model, by setting a sealing assembly with a spring floating mechanism, utilizes the cooperation of the second spring, the limiting ring, the transmission tube and the first sealing ring to solve the problem of poor end face sealing or excessive compression caused by different tolerances in the thread length of the pressure gauge connector in the prior art, and achieves the technical effect of automatically adapting to the screw depth of the pressure gauge and maintaining a constant axial sealing pressure.

[0020] 2. This utility model solves the problem of easy leakage when the single end face seal is loose in the prior art by setting an inflation tube and a second sealing ring between the fixed tube and the fixed ring, and using the inflation expansion principle to drive the second sealing ring to deform. It achieves the technical effect of auxiliary radial sealing of the pressure gauge connector side wall and further improving the airtightness of the interface.

[0021] 3. This utility model solves the problem of cumbersome and time-consuming disassembly and assembly of threaded protective covers in the prior art by setting a protective component with a slider and spring ball structure on the outside of the connecting pipe, in conjunction with the sliding groove on the surface of the connecting pipe. It achieves the technical effect of quickly protecting the calibration interface from dust and improving operational efficiency when not in operation. Attached Figure Description

[0022] Figure 1 This is a perspective view of a pressure gauge calibration stabilizing power supply device proposed in this utility model;

[0023] Figure 2 This invention relates to a pressure gauge calibration device with a pressure supply.

[0024] Figure 3 This is a schematic diagram of the second sealing ring of a pressure gauge calibration stabilizing power supply device proposed in this utility model;

[0025] Figure 4 for Figure 3 Enlarged structural diagram at point A in the diagram;

[0026] Figure 5 This is a schematic diagram of the air inlet pipe of a pressure gauge calibration stabilizing power supply device proposed in this utility model;

[0027] Figure 6 This is a schematic diagram of a protective cover for a pressure gauge calibration voltage stabilizing power supply device proposed in this utility model;

[0028] Figure 7 for Figure 6 A magnified structural diagram at point B in the diagram.

[0029] Legend:

[0030] 1. Pressure calibration bench; 2. Pressure gauge; 3. Connecting pipe; 4. Protective components; 401. Protective cover; 402. Slide groove; 403. Slider; 404. First spring; 405. Ball retainer; 5. Sealing components; 501. Fixed shell; 502. Second spring; 503. Transmission pipe; 504. First sealing ring; 505. Limiting ring; 506. Fixed pipe; 507. Fixed ring; 508. Inflation pipe; 509. Sealing plug; 510. Fixed block; 511. Second sealing ring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-7 The present invention provides an embodiment of a pressure gauge calibration device, comprising a pressure calibration platform 1 and a connecting pipe 3 fixedly installed on the top of the pressure calibration platform 1. The pressure calibration platform 1 serves as a support base for the overall device and a pressure source supply platform, while the connecting pipe 3 serves as a docking port for screwing in and fixing the pressure gauge 2 to be calibrated. The inner wall of the top of the connecting pipe 3 is provided with threads for the pressure gauge 2 to be calibrated to be screwed in.

[0033] The inside of the connecting pipe 3 is equipped with a sealing component 5 for achieving airtight sealing of the interface, and the outside of the connecting pipe 3 is equipped with a protective component 4 for dust protection when not in operation.

[0034] The sealing assembly 5 includes a fixed housing 501, which is fixedly connected to the inner wall of the connecting pipe 3, providing installation space and guiding reference for the internal moving parts. A second spring 502 is installed on the bottom side inside the fixed housing 501. The second spring 502 is a helical compression spring, and its top abuts against a limit ring 505. A transmission pipe 503 is fixedly connected to the top of the limit ring 505. A first sealing ring 504 is further fixedly connected to the top of the transmission pipe 503. The first sealing ring 504 is located inside the upper part of the fixed housing 501 and is used to contact the bottom end face of the pressure gauge 2.

[0035] The outer peripheral surface of the limiting ring 505 slides against the inner wall surface of the fixed shell 501, so that the first sealing ring 504, the transmission tube 503 and the limiting ring 505 can reciprocate as a whole component along the axial direction of the fixed shell 501, and the component maintains an upward movement trend under the elastic support of the second spring 502.

[0036] A fixing tube 506 is also fixedly installed on the inner wall surface of the fixing shell 501. A fixing ring 507 is coaxially arranged on the outer side of the fixing tube 506. The fixing tube 506 and the fixing ring 507 are connected and fixed by several fixing blocks 510. The fixing blocks 510 are located between the fixing tube 506 and the fixing ring 507 and play a supporting and positioning role. An air inlet tube 508 is provided in the annular gap formed between the fixing tube 506 and the fixing ring 507. A second sealing ring 511 is installed on the top of the fixing ring 507. The second sealing ring 511 is used to provide auxiliary sealing for the outer wall of the pressure gauge 2.

[0037] The sealing assembly 5 also includes an inflation drive structure for driving the second sealing ring 511 to produce radial deformation, and the protective assembly 4 and the connecting pipe 3 form a specific snap-fit ​​quick-release relationship.

[0038] An inflation tube 508 is disposed within the receiving space formed between a fixed tube 506 and a fixed ring 507. A sealing plug 509 is connected to the side of the inflation tube 508. The sealing plug 509 penetrates the wall of the fixed ring 507 and extends to the outside of the fixed ring 507, serving as an interface for injecting gas into the inflation tube 508. When gas is injected into the inflation tube 508 through the sealing plug 509, the inflation tube 508 is configured to increase in volume under the action of gas expansion force, thereby pushing the second sealing ring 511 located at the top of the fixed ring 507 to be squeezed inward, so that the second sealing ring 511 is tightly attached to the bottom outer wall of the pressure gauge 2, thereby achieving radial sealing.

[0039] Meanwhile, the protective cover 401 in the protective assembly 4 is correspondingly provided with an inner wall structure for quick locking. Specifically, the inner wall of the protective cover 401 is fixedly connected to a slider 403, and a groove 402 is provided on the outer surface of the connecting tube 3 for the slider 403 to be inserted and slid. The groove 402 is constructed as an L-shaped or spiral guide groove. In the assembled state, the protective cover 401 is sleeved on the top of the connecting tube 3, and the slider 403 is aligned and slidably engaged in the groove 402. This slider and groove engagement structure ensures that the protective cover 401 can be installed by simple insertion and rotation, avoiding cumbersome threading operations.

[0040] For a specific implementation of the internal locking mechanism of the protective component 4, please refer to Figure 6 and Figure 7 The slider 403 has a blind hole or receiving cavity inside. The first spring 404 is installed inside the slider 403. One end of the first spring 404 abuts against the inside of the slider 403, and the other end abuts against the ball 405. The ball 405 tends to extend out of the surface of the slider 403 under the elastic force of the first spring 404. The surface of the groove 402 has a specific groove that matches the shape of the ball 405. The inner wall of the groove 402 is constructed with a pressing slope or depth restriction, which can press the ball 405 to force it to retract inward and compress the first spring 404, so as to realize the pop-out locking of the ball 405 in the groove position.

[0041] Regarding the specific configuration of the internal axial floating structure of the sealing assembly 5, the first sealing ring 504 is located at the upper position inside the fixed shell 501. The top end of the transmission pipe 503 is fixedly connected to the first sealing ring 504, and the bottom end is fixedly connected to the limiting ring 505. The outer circumferential surface of the limiting ring 505 forms a sliding fit with the inner wall surface of the fixed shell 501. The second spring 502 is installed on the bottom side inside the fixed shell 501 and supported below the limiting ring 505. The outer diameter of the fixed shell 501 is equal to or slightly smaller than the inner diameter of the connecting pipe 3 to ensure compact installation.

[0042] Regarding the detailed design of the radial sealing structure, the fixing blocks 510 are evenly distributed along the circumference of the fixing tube 506 to maintain the coaxial distance between the fixing tube 506 and the fixing ring 507. The inflation tube 508 is filled within this distance. The sealing plug 509 is connected to the side of the inflation tube 508 and extends through the fixing ring 507 to the outside. The second sealing ring 511 is placed on the annular end face at the top of the fixing ring 507. The second sealing ring 511 is preferably made of highly elastic rubber material so that it can deform under the expansion and pushing of the inflation tube 508.

[0043] In addition, the top inner wall of the connecting pipe 3 is machined with a standard thread structure, which is used to mate with the connector thread of the pressure gauge 2 to be calibrated, ensuring that the pressure gauge 2 can be screwed into the connecting pipe 3 and supported by the first sealing ring 504.

[0044] Working principle: When using the pressure calibration bench 1, the pressure gauge 2 to be calibrated is first screwed into the top inner wall of the connecting pipe 3. During this process, the sealing component 5 inside the connecting pipe 3 begins to function. The bottom end face of the pressure gauge 2 contacts and pushes the first sealing ring 504 located inside the upper part of the fixed shell 501 to move downward. The first sealing ring 504 drives the transmission pipe 503 connected to its bottom and the limiting ring 505 connected to the bottom of the transmission pipe 503 to move downward synchronously. This causes the limiting ring 505 to slide downward along the inner wall of the fixed shell 501, thereby compressing the second spring 502 located on the bottom side inside the fixed shell 501. The rebound force generated by the second spring 502 pushes the limiting ring 505, the transmission pipe 503 and the first sealing ring 504 upward, so that the top of the first sealing ring 504 is always tightly attached to the bottom surface of the pressure gauge 2. Thus, the floating compensation function of the spring is used to achieve a reliable axial seal.

[0045] Meanwhile, the fixing tube 506 is installed on the inner wall surface of the fixing shell 501, the fixing ring 507 is located on the outside of the fixing tube 506, and the inflation tube 508 is set in the gap between the fixing tube 506 and the fixing ring 507. Gas is injected into the inflation tube 508 in advance through the sealing plug 509 located on the side. The force generated by the expansion of the gas pushes the second sealing ring 511 located on the top of the fixing ring 507 to deform, so that the second sealing ring 511 tightly fits the bottom outer wall of the pressure gauge 2, thereby achieving radial auxiliary sealing, which together with the aforementioned axial sealing ensures the airtightness of the interface.

[0046] After the calibration is completed and the pressure gauge 2 is removed, a protective component 4 is used to prevent dust from entering the connecting pipe 3. The protective cover 401 is placed on the top outer surface of the connecting pipe 3, so that the slider 403 set on the inner wall of the protective cover 401 is aligned and inserted into the groove 402 opened on the outer surface of the connecting pipe 3. At this time, the inner wall of the groove 402 presses against the retaining ball 405 installed inside the slider 403, forcing the retaining ball 405 to retract inward and compress the first spring 404 located inside the slider 403. Then, the protective cover 401 is rotated, and the slider 403 slides in the groove 402. When the retaining ball 405 moves to a specific groove position on the surface of the groove 402, the first spring 404 releases its elastic force to push the retaining ball 405 into the groove, thereby stably fixing the protective cover 401 to the top of the connecting pipe 3.

Claims

1. A pressure gauge calibration stabilizing power supply device, comprising: Pressure calibration bench (1); Connecting pipe (3), the connecting pipe (3) is fixedly installed on the top of the pressure testing bench (1); The connecting pipe (3) is equipped with a sealing component (5) inside and a protective component (4) outside; Its features are, The sealing assembly (5) includes a fixed shell (501), which is fixed to the inner wall of the connecting pipe (3). A second spring (502) is installed on the bottom side inside the fixed shell (501). The top of the second spring (502) abuts against a limiting ring (505). The limiting ring (505) is connected to a transmission pipe (503). The top of the transmission pipe (503) is connected to a first sealing ring (504). The limiting ring (505) is slidably fitted to the inner wall of the fixed shell (501). A fixing tube (506) is installed on the inner wall surface of the fixing shell (501). A fixing ring (507) is provided on the outer side of the fixing tube (506). The fixing tube (506) and the fixing ring (507) are connected and fixed by a fixing block (510). An inflation tube (508) is provided between the fixing tube (506) and the fixing ring (507). A second sealing ring (511) is provided on the top of the fixing ring (507). The protective component (4) includes a protective cover (401), which is fitted onto the top outer surface of the connecting tube (3). The inner wall of the protective cover (401) is provided with a slider (403), and the outer surface of the connecting tube (3) is provided with a groove (402) for the slider (403) to be inserted.

2. The pressure gauge calibration stabilizing power supply device according to claim 1, characterized in that: A first spring (404) is installed inside the slider (403). One end of the first spring (404) abuts against the inside of the slider (403), and the other end abuts against a ball (405).

3. The pressure gauge calibration stabilizing power supply device according to claim 2, characterized in that: The surface of the slide (402) is provided with a specific groove, and the ball (405) can be inserted into the groove under the elastic force of the first spring (404) to fix the protective cover (401) to the top of the connecting pipe (3).

4. The pressure gauge calibration stabilizing power supply device according to claim 3, characterized in that: The inner wall of the groove (402) is configured to compress the retaining ball (405), forcing the retaining ball (405) to retract inward and compress the first spring (404).

5. The pressure gauge calibration stabilizing power supply device according to claim 1, characterized in that: The first sealing ring (504) is configured such that when pushed by the bottom end face of the pressure gauge (2), it drives the limiting ring (505) to slide down along the inner wall of the fixed shell (501) and compress the second spring (502) through the transmission tube (503).

6. The pressure gauge calibration stabilizing power supply device according to claim 5, characterized in that: The second spring (502) is configured to generate a rebound force to push the limiting ring (505), transmission tube (503) and first sealing ring (504) upward, so that the top of the first sealing ring (504) is tightly attached to the bottom surface of the pressure gauge (2) to achieve axial sealing.

7. The pressure gauge calibration stabilizing power supply device according to claim 1, characterized in that: The inflation tube (508) is connected to a sealing plug (509) on its side, and the sealing plug (509) is used to inject gas into the fixed ring (507).

8. The pressure gauge calibration stabilizing power supply device according to claim 7, characterized in that: The inflation tube (508) is configured to push the second sealing ring (511) located at the top of the fixing ring (507) to fit tightly against the bottom outer wall of the pressure gauge (2) under the action of gas expansion force to achieve radial sealing.

9. The pressure gauge calibration stabilizing power supply device according to claim 1, characterized in that: The inner wall of the top of the connecting pipe (3) is threaded for the pressure gauge (2) to be calibrated to be screwed in.

10. The pressure gauge calibration stabilizing power supply device according to claim 1, characterized in that: The first sealing ring (504) is located inside the upper part of the fixed shell (501), the bottom of the transmission tube (503) is connected to the limiting ring (505), and the fixing block (510) is located between the fixing tube (506) and the fixing ring (507).

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