Pressure detection and calibration device

Abstract

The utility model discloses a pressure detection and calibration device, which is used for detecting and calibrating the pressure in a sealed thin-wall rigid box body and comprises an air chamber main body, an air path communication assembly, a sealing assembly and an adjusting assembly, the air chamber main body is enclosed by a shell, an opening of the shell is covered with a rigid sheet, and a communicating hole penetrating into the air chamber main body is formed in the shell; the gas path communication assembly comprises a first gas path connector and a communication pipe and is used for communicating the external environment and the pressure sensor. The sealing assembly is connected with the shell, fixes the rigid sheet and forms sealing between the rigid sheet and the shell; the adjusting assembly comprises a knob and a pressing block, the pressing block abuts against the rigid sheet, and the knob can drive the pressing block to get close to or away from the rigid sheet. According to the pressure detection calibration device, the press block is driven by the knob to adjust the deformation of the rigid sheet, so that the pressure compensation amount is changed, the fluctuation of the pressure in the box caused by the environment is accurately compensated, the pressure detection error is reduced, and the universality and the accuracy of the pressure calibration device are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure detection calibration technical field, in particular to a pressure detection calibration device. BACKGROUND

[0002] For sealed thin-walled rigid box, when the atmospheric temperature or pressure changes, the box will produce slight deformation and make the box volume change, and the pressure in the box will also fluctuate. Therefore, the pressure detection process of the general sealed thin-walled rigid box will adopt the pressure calibration device with one metal sheet and the rest rigid body for calibration. When the environment changes, the box produces slight deformation and makes the box pressure fluctuate, and the metal sheet of the pressure calibration device will also cause the pressure fluctuation in the device through deformation, and the fluctuation caused by the metal sheet realizes the compensation calibration of the pressure in the box.

[0003] In practical application, the fluctuation size of the sealed thin-walled rigid box caused by the environment is mainly affected by the rigidity of the box itself, and the rigidity of the box is affected by the wall thickness, material, design processing technology and assembly technology. This leads to the thickness or material of the metal sheet of the calibration device needing to be adjusted constantly to match the rigidity of the box. Therefore, for different rigid boxes, the pressure calibration device with a single metal sheet is difficult to apply, and there is the problem of poor universality. And because the thickness and material of the metal sheet of the pressure calibration device are difficult to select accurately, the calibration device is also difficult to calibrate accurately when the pressure in the box fluctuates. SUMMARY

[0004] The technical problem solved by the utility model is to provide a pressure detection calibration device, which solves the problem that the existing pressure detection calibration device is difficult to apply to different rigid boxes, has poor universality, and is difficult to calibrate accurately when the pressure in the box fluctuates due to the difficulty in accurately selecting the thickness and material of the metal sheet of the pressure calibration device, and avoids all the above defects.

[0005] To solve the above technical problems, one technical scheme of the utility model is to provide a pressure detection calibration device for detecting and calibrating the pressure in a sealed thin-walled rigid box, which comprises a gas chamber body, a gas path communication assembly, a sealing assembly and an adjusting assembly.

[0006] The gas chamber body is enclosed by a shell, the opening of the shell is covered with a rigid sheet, and the shell is provided with a communication hole penetrating into the gas chamber body.

[0007] The gas path communication assembly comprises a first gas path joint and a communication pipe, one end of the first gas path joint is communicated with the gas chamber body through the communication hole, the other end is connected with the communication pipe, and the communication pipe is communicated with the external environment and connected with the pressure sensor;

[0008] The sealing assembly is detachably connected with the shell, is used for fixing the rigid sheet, and forms a seal between the rigid sheet and the shell.

[0009] The adjusting assembly is installed on the sealing assembly, the adjusting assembly comprises a knob and a pressing block, the pressing block abuts against the rigid sheet, and the knob can drive the pressing block to approach or move away from the rigid sheet.

[0010] The shell comprises a gas chamber cover and a gas chamber cylinder, the gas chamber cover comprises a cavity with one end being open; the gas chamber cylinder has a containing cavity with two ends being open, and the communication hole is arranged on the side wall of the gas chamber cylinder;

[0011] The gas chamber body further comprises a gas chamber seat, the gas chamber seat is a flat plate with a first through hole being arranged at the center;

[0012] One end of the gas chamber cylinder is connected with the gas chamber cover, the gas chamber seat is arranged on the other end of the gas chamber cylinder, and the cavity, the containing cavity and the first through hole are communicated in sequence.

[0013] The inner wall of the opening of the gas chamber cover is provided with a sunken platform, one end of the gas chamber cylinder is placed on the sunken platform, and the gas chamber cover and the gas chamber cylinder are bonded as a whole;

[0014] The outer wall of the other end of the gas chamber cylinder is provided with a step, the gas chamber cylinder passes through the first through hole so that the gas chamber seat is placed on the step, and the gas chamber cylinder and the gas chamber seat are bonded as a whole.

[0015] The sealing assembly comprises a first sealing gasket, a second sealing gasket and a sealing base, the first sealing gasket is attached to the gas chamber seat, the rigid sheet is placed between the first sealing gasket and the second sealing gasket, the second sealing gasket is attached to the sealing base, and the first sealing gasket, the rigid sheet, the second sealing gasket and the sealing base are all fixed on the gas chamber seat.

[0016] The center of the first sealing gasket, the second sealing gasket and the sealing base is provided with a second through hole, the centers of the first through hole and the second through hole coincide and the diameters are equal.

[0017] The gas chamber seat, the first sealing gasket, the rigid sheet, the second sealing gasket and the sealing base are all provided with mounting holes in correspondence, and the mounting holes are used for mounting bolts;

[0018] The number of the mounting holes is multiple, and the multiple mounting holes are uniformly distributed around the first through hole and the second through hole.

[0019] The side wall of the air chamber cylinder is further provided with an air outlet hole penetrating into the air chamber body, and the pressure detection calibration device further comprises a buffer air path assembly.

[0020] The buffer air path assembly comprises a buffer air path joint, an upper air pipe, an air resistance and a lower air pipe.

[0021] The adjusting assembly further comprises an adjusting seat and a base;

[0022] The base is bolted with the sealing base, and the center of the base is provided with an adjusting hole;

[0023] The pressing block is a T-shaped structure, comprising a top rod and a pressing plate, one end of the top rod is fixed to the center of the pressing plate, the other end of the top rod penetrates through the adjusting hole, and one side of the pressing plate abuts against the rigid sheet;

[0024] The adjusting seat is fixed on the base and is located on different sides of the base from the pressing plate respectively, and the top rod penetrates through the adjusting seat;

[0025] The knob is threadedly connected with the adjusting seat and gap-fitted with the top rod, and the knob can drive the pressing block to move when rotating.

[0026] The side of the pressing plate, which abuts against the rigid sheet in the axial direction, is annular, and the side of the pressing plate, which is away from the rigid sheet, is provided with multiple penetrating air holes.

[0027] Compared with the prior art, the pressure detection calibration device has the beneficial effects that: the deformation amount of the rigid sheet is adjusted by the knob driving the pressing block, the deformation amount of the rigid sheet caused by the environment is changed, the pressure compensation amount is changed, the corresponding rigid box is accurately matched, the pressure detection of the sealed thin-walled rigid box in different environments is adapted, the fluctuation of the pressure in the box caused by the environment is accurately compensated, the pressure detection error is reduced, and the universality and accuracy of the pressure calibration device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 is a perspective structural schematic view of the pressure detection calibration device of the present application;

[0030] Figure 2 is a sectional view of the pressure detection calibration device of the present application;

[0031] Figure 3 is an exploded structural schematic view of the pressure detection calibration device of the present application;

[0032] Figure 4 is a structural schematic view of the pressing block. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] All the directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly. The terms "first", "second", etc. in the present application are used to distinguish different objects, but not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally also includes other steps or units inherent to the process, method, product or device.

[0035] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in to other embodiments.

[0036] Referring to Figures 1 to 4 , Figure 1 is a schematic diagram of the pressure detection calibration device, which is used for detecting and calibrating the pressure in the sealed thin-walled rigid box. The sealed thin-walled rigid box is in communication with the external environment, and the pressure in the sealed thin-walled rigid box can reflect the temperature or pressure change of the external environment. In one embodiment, the sealed thin-walled rigid box is used for calibrating the detection pressure in the lung function volume plethysmography box installed in the room. The pressure detection calibration device is in communication with the lung function volume plethysmography box. The detection pressure is detected by the pressure sensor in the lung function volume plethysmography box. Since the reference gas interface of the pressure sensor is in communication with the indoor environment, the detection pressure is based on the indoor air pressure. When the indoor pressure changes, the detection pressure also changes accordingly, so that the detection pressure cannot accurately reflect the pressure condition in the lung function volume plethysmography box. The pressure detection calibration device of the present application calibrates the detection pressure and reduces the error caused by the change of the environmental pressure.

[0037] The pressure detection calibration device in the present application comprises a gas chamber body 1, a gas path communication assembly 2, a sealing assembly 3 and an adjusting assembly 4. The gas chamber body 1 is enclosed by a shell, and the shell is rigid and will not deform due to the change of air pressure. The shell has an opening, and a rigid sheet 11 is covered on the opening of the shell, thereby forming a sealed space with a volume of 200-400 ml. The rigid sheet 11 refers to a sheet-shaped component with certain rigidity, but it is relatively soft and easy to deform, and the thickness is relatively small. Specifically, the thickness value of the sheet is less than 0.5 mm, which is a rigid sheet. The pressure change in the sealed space due to temperature and air pressure will be reflected by the change of the rigid sheet 11. The shell is provided with a communication hole 12 penetrating into the gas chamber body 1, which is used for communication with the outside.

[0038] The air path communication assembly 2 comprises a first air path joint 21 and a communication pipe 22. One end of the first air path joint 21 communicates with the air chamber body 1 through the communication hole 12, and the other end is connected with the communication pipe 22. The communication pipe 22 communicates with the external environment and is connected with the pressure sensor. In one embodiment, the communication pipe 22 communicates with the lung function volume recording box installed in the room, that is, the external environment refers to the environment in the lung function volume recording box. When the pressure in the lung function volume recording box changes, the pressure in the air chamber body 1 also changes synchronously. The pressure sensor is used to detect the pressure value in the air chamber body 1 and the lung function volume recording box.

[0039] The sealing assembly 3 is detachably connected with the shell, is used for fixing the rigid sheet 11, and forms a seal between the rigid sheet 11 and the shell. Since the rigid sheet 11 is easy to deform, it is difficult to be directly fixed on the shell. Specifically, by arranging the sealing assembly 3, the sealing assembly 3 is installed at the opening of the shell, and the rigid sheet 11 is fixed by using the sealing assembly 3, so that the rigid sheet 11 covers the opening of the shell. At the same time, a seal is formed between the rigid sheet 11 and the shell, avoiding the formation of a gap between the two, so that the air chamber body 1 can only communicate with the outside through the air path communication assembly 2.

[0040] The adjusting assembly 4 is installed on the sealing assembly 3, and is used for adjusting the deformation amount of the rigid sheet 11 affected by the environment, changing the pressure compensation amount, so as to match the pressure fluctuation in the rigid box caused by the environment. The adjusting assembly 4 comprises a knob 41 and a pressing block 42. The pressing block 42 abuts against the rigid sheet 11, and the knob 41 can drive the pressing block 42 to approach or move away from the rigid sheet 11, so as to change the deformation amount of the rigid sheet 11, and make the detection of the pressure calibration device more accurate.

[0041] The material of the rigid sheet 11 can be metal, preferably, the rigid sheet 11 is made of brass. The brass material is soft and has good deformation capacity, and can better reflect the pressure change in the air chamber body. The thickness of the rigid sheet 11 is set according to the strength of the box. The higher the strength, the thicker the thickness, and vice versa. At the same time, the thickness of the rigid sheet 11 is also related to the cross-sectional area of the reference chamber, and there is no general value. It is selected according to actual needs. In one embodiment, the thickness of the rigid sheet 11 is 0.15 mm.

[0042] The specific application mode of the pressure detection calibration device of the present application is that the sensor gas path joint is connected to the pressure sensor reference end through the communication pipe 22, and the other end of the pressure sensor is connected to the collection box pressure in the box. Without adjusting the deformation amount of the rigid sheet 11, when the external environment changes, the box deforms slightly and causes the pressure fluctuation in the box. At this time, the pressure fluctuation detected by the pressure sensor is about 2 Pa. By rotating the knob 41 to adjust the deformation amount of the rigid sheet 11, the compensation amount of the pressure calibration device changes. When the external environment changes equally, the pressure fluctuation detected by the pressure sensor at this time is about 0.4 Pa, which is reduced by 80%, and the box pressure calibration is realized. For different rigid boxes, this mode can be used for calibration.

[0043] Through the above setting, the knob 41 drives the pressing block 42 to adjust the deformation amount of the rigid sheet 11, changes the deformation amount of the rigid sheet 11 caused by the environment, and further changes the pressure compensation amount, so as to accurately match the box with corresponding rigidity, adapt to the pressure detection of the sealed thin-walled rigid box in different environments, accurately compensate the fluctuation of the pressure in the box caused by the environment, reduce the pressure detection error, and improve the universality and accuracy of the pressure calibration device.

[0044] In the present application, the shell includes a gas chamber cover 13 and a gas chamber cylinder 14. The gas chamber cover 13 includes a cavity with one end open. The gas chamber cylinder 14 has a containing cavity with two ends open. One end of the gas chamber cylinder 14 is installed at the opening of the gas chamber cover 13, and the spaces inside the two are communicated. The communication hole 12 is arranged on the side wall of the gas chamber cylinder 14. The gas chamber body 1 further includes a gas chamber seat 15, which is a flat plate with a first through hole 100 arranged at the center. One end of the gas chamber cylinder 14 is connected with the gas chamber cover 13. The gas chamber seat 15 is arranged on the other end of the gas chamber cylinder 14. The cavity, the containing cavity and the first through hole 100 are sequentially communicated, forming a hollow internal space.

[0045] In the present application, a sunken platform 131 is arranged on the inner wall of the opening of the gas chamber cover 13. One end of the gas chamber cylinder 14 is placed on the sunken platform 131. The contact part of the gas chamber cover 13 and the gas chamber cylinder 14 is integrally bonded by adhesive, and the interface is sealed without gas leakage. A step 141 is arranged on the outer wall of the other end of the gas chamber cylinder 14. The gas chamber cylinder 14 passes through the first through hole 100 so that the gas chamber seat 15 is placed on the step 141. The contact part of the gas chamber cylinder 14 and the gas chamber seat 15 is integrally bonded by adhesive, and the interface is sealed without gas leakage. Through the above setting, the gas chamber cover 13, the gas chamber cylinder 14 and the gas chamber seat 15 are integrally bonded in sequence, and the interiors of the three are communicated, forming a shell with one opening.

[0046] Since the gas chamber cylinder 14 needs to pass through the first through hole 100 to be connected with the gas chamber seat 15, the diameter of the first through hole 100 is larger than the diameter of the containing cavity of the gas chamber cylinder 14.

[0047] The sealing assembly 3 in the application comprises a first sealing gasket 31, a second sealing gasket 32 and a sealing base 33. The first sealing gasket 31 and the second sealing gasket 32 are both thin flat shapes and are made of silica gel. The first sealing gasket 31 is attached to the plane of the air chamber seat 15. The rigid sheet 11 is placed between the first sealing gasket 31 and the second sealing gasket 32. The two sides of the rigid sheet 11 are tightly clamped by the first sealing gasket 31 and the second sealing gasket 32. The other side of the second sealing gasket 32 is attached to the sealing base 33. The first sealing gasket 31 and the second sealing gasket 32 made of silica gel are arranged on the two sides of the rigid sheet 11 to tightly attach the rigid sheet 11 to the shell. A closed space is formed in the air chamber body 1. The interior of the air chamber body 1 can only communicate with the outside through the air path communication assembly 2. The first sealing gasket 31, the rigid sheet 11, the second sealing gasket 32 and the sealing base 33 are all fixed on the air chamber seat 15. Since the air chamber seat 15 is bonded with the air chamber cover 13 and the air chamber cylinder 14 to form a whole, the sealing assembly 3 is relatively fixed with the air chamber body 1.

[0048] In the application, the first sealing gasket 31, the second sealing gasket 32 and the sealing base 33 are all provided with a second through hole 200 in the center. The center of the first through hole 100 coincides with the center of the second through hole 200 and the diameters are equal. Since the rigid sheet 11 needs to communicate with the air chamber body 1 in specific application, the second through hole 200 is arranged on the first sealing gasket 31. Since the rigid sheet 11 will deform during use, the second through hole 200 is also arranged on the second sealing gasket 32 and the sealing base 33 to reserve space for the outward deformation of the rigid sheet 11.

[0049] In the application, the air chamber seat 15, the first sealing gasket 31, the rigid sheet 11, the second sealing gasket 32 and the sealing base 33 are all provided with mounting holes 300. The mounting holes 300 are used for mounting bolts. The first sealing gasket 31, the rigid sheet 11, the second sealing gasket 32 and the sealing base 33 are fixed and mounted on the air chamber seat 15 by the bolts. The number of the mounting holes 300 is multiple. The multiple mounting holes 300 are uniformly distributed around the first through hole 100 and the second through hole 200. The force around the rigid sheet 11 is balanced during installation to avoid affecting the deformation of the rigid sheet 11 to the maximum extent.

[0050] In the application, the side wall of the air chamber cylinder 14 is further provided with an air outlet hole 16 penetrating into the air chamber body 1. The pressure detection and calibration device further comprises a buffer air path assembly 5. The buffer air path assembly 5 communicates with the air chamber body 1 through the air outlet hole 16. The buffer air path assembly 5 is used to balance the interior of the air chamber body 1 with the outside, delay the balancing process, give a fluctuation compensation time and avoid short-term large fluctuations, so as to more accurately detect and calibrate the pressure change.

[0051] The buffer gas path assembly 5 in the application comprises a buffer gas path joint 51, an upper gas pipe 52, a gas resistance 53, and a lower gas pipe 54. One end of the buffer gas path joint 51 is in communication with the gas chamber body 1 through the gas outlet hole 16, and the other end is connected with the lower gas pipe 54. The lower gas pipe 54 serves as a connecting function. The two ends of the gas resistance 53 are connected with the upper gas pipe 52 and the lower gas pipe 54, respectively. The gas resistance 53 is used to delay the balancing process and give a fluctuation compensation time. The upper gas pipe 52 is in communication with the external environment and is used to discharge gas, while protecting one end of the gas resistance 53 from dust.

[0052] The adjusting assembly 4 in the application further comprises an adjusting seat 43 and a base 44. The base 44 is bolted with the sealing base 33. Specifically, the sealing base 33 has a flat part and a bent part extending from the flat part. The flat part is installed with the first sealing gasket 31, the rigid sheet 11, and the second sealing gasket 32. The bent part is directed towards the base 44. The base 44 is provided with bolt holes corresponding to the four corners of the bent part, and the two are bolted. Through the above arrangement, the gas chamber body 1, the sealing assembly 3, and the adjusting assembly 4 are combined as a whole. The center of the base 44 is provided with a through adjusting hole 441. The pressing block 42 is a T-shaped structure, comprising a top rod 421 and a pressing plate 422. The top rod 421 is a cylinder, and the pressing plate 422 is a sheet structure with a circular cross-sectional shape. One end of the top rod 421 is fixed to the center of the pressing plate 422, and the other end of the top rod 421 passes through the adjusting hole 441. One side of the pressing plate 422 abuts against the rigid sheet 11. The center of the pressing plate 422 coincides with the center of the rigid sheet 11, and the diameter of the pressing plate 422 is smaller than the diameter of the first through hole 100 and the second through hole 200. The knob 41 can drive the pressing block 42 to approach or move away from the rigid sheet 11, thereby changing the deformation amount of the rigid sheet 11.

[0053] The adjusting seat 43 is hollow inside, fixed on the base 44, and located on different sides of the base 44 with the pressing plate 422, respectively. The top rod 421 passes through the adjusting seat 43.

[0054] The knob 41 is threadedly connected with the adjusting seat 43 and gap-fitted with the top rod 421. When the knob 41 rotates, it can drive the pressing block 42 to move, i.e., to approach or move away from the rigid sheet 11, thereby changing the deformation amount of the rigid sheet 11.

[0055] The pressure plate 422 in the application is annular on the side abutting against the rigid sheet 11 in the axial direction, the center is hollow, the side of the pressure plate 422 away from the rigid sheet 11 is solid, that is, a groove is formed on the side of the pressure plate 422 abutting against the rigid sheet 11, only the annular part abuts against the rigid sheet 11. A plurality of through air holes 400 are also formed on the side of the pressure plate 422 away from the rigid sheet 11, the plurality of air holes 400 are uniformly distributed around the center of the pressure plate 422, the groove is communicated with the external environment, an enclosed space is avoided between the pressure plate 422 and the rigid sheet 11, and the deformation of the rigid sheet 11 is affected.

[0056] The pressure detection calibration device is used, the knob drives the pressure block to adjust the deformation amount of the rigid sheet, the deformation amount of the rigid sheet caused by the influence of the environment is changed, and then the pressure compensation amount is changed, so that the corresponding rigid box is accurately matched, the pressure detection of the sealed thin-walled rigid box under different environments is adapted, the fluctuation of the pressure in the box caused by the environment is accurately compensated, the pressure detection error is reduced, and the universality and accuracy of the pressure calibration device are improved.

[0057] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and equivalent structures or equivalent process transformations using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields are also included in the patent protection range of the utility model.

Claims

1. A pressure detection calibration device for detecting a pressure in a sealed thin-walled rigid box, characterized by, The pressure detection calibration device comprises a gas chamber body, a gas path communication assembly, a sealing assembly and an adjusting assembly; The gas chamber body is enclosed by a shell, and a rigid sheet is covered on the opening of the shell; a communication hole is arranged on the shell and penetrates into the gas chamber body; The gas path communication assembly comprises a first gas path joint and a communication pipe; one end of the first gas path joint is communicated with the gas chamber body through the communication hole, and the other end is connected with the communication pipe; the communication pipe is connected with an external environment and a pressure sensor; The sealing assembly is detachably connected with the shell, and is used for fixing the rigid sheet and forming a seal between the rigid sheet and the shell; The adjusting assembly is installed on the sealing assembly, and comprises a knob and a pressing block; the pressing block abuts against the rigid sheet, and the knob can drive the pressing block to approach or move away from the rigid sheet.

2. The pressure detection calibration device of claim 1, wherein, The shell comprises a gas chamber cover and a gas chamber cylinder; the gas chamber cover comprises a cavity with an open end; the gas chamber cylinder has a containing cavity with two open ends; the communication hole is arranged on the side wall of the gas chamber cylinder; The gas chamber body further comprises a gas chamber seat; the gas chamber seat is a flat plate with a first through hole arranged in the center; One end of the gas chamber cylinder is connected with the gas chamber cover; the gas chamber seat cover is arranged on the other end of the gas chamber cylinder; the cavity, the containing cavity and the first through hole are sequentially communicated.

3. The pressure detection calibration device of claim 2, wherein, A sunken platform is arranged on the inner wall of the opening of the gas chamber cover; one end of the gas chamber cylinder is placed on the sunken platform; the gas chamber cover and the gas chamber cylinder are bonded as a whole; A step is arranged on the outer wall of the other end of the gas chamber cylinder; the gas chamber cylinder passes through the first through hole so that the gas chamber seat is placed on the step; the gas chamber cylinder and the gas chamber seat are bonded as a whole.

4. The pressure detection calibration device of claim 3, wherein, The sealing assembly comprises a first sealing gasket, a second sealing gasket and a sealing base; the first sealing gasket is attached to the gas chamber seat; the rigid sheet is placed between the first sealing gasket and the second sealing gasket; the second sealing gasket is attached to the sealing base; the first sealing gasket, the rigid sheet, the second sealing gasket and the sealing base are all fixed on the gas chamber seat.

5. The pressure detection calibration device of claim 4, wherein, Second through holes are arranged in the centers of the first sealing gasket, the second sealing gasket and the sealing base; the centers of the first through hole and the second through hole coincide and have equal diameters.

6. The pressure detection calibration device of claim 5, wherein, Mounting holes are arranged on the gas chamber seat, the first sealing gasket, the rigid sheet, the second sealing gasket and the sealing base in correspondence; the mounting holes are used for mounting bolts; The number of the mounting holes is plural, and the plural mounting holes are uniformly distributed around the first through hole and the second through hole.

7. The pressure detection calibration device of claim 2, wherein, An air outlet hole is further arranged on the side wall of the gas chamber cylinder and penetrates into the gas chamber body; the pressure detection calibration device further comprises a buffer gas path assembly; the buffer gas path assembly is communicated with the gas chamber body through the air outlet hole.

8. The pressure detection calibration device of claim 7, wherein, The buffer gas path assembly comprises a buffer gas path joint, an upper gas pipe, a gas resistance and a lower gas pipe, one end of the buffer gas path joint is communicated with the gas chamber body through the gas outlet, and the other end is connected with the lower gas pipe; two ends of the gas resistance are connected with the upper gas pipe and the lower gas pipe respectively; the upper gas pipe is communicated with the external environment.

9. The pressure detection calibration device of claim 4, wherein, The adjusting assembly further comprises an adjusting seat and a base; The base is bolted with the sealing base, and the center of the base is provided with an adjusting hole; The pressing block is T-shaped structure, comprising a top rod and a pressing plate, one end of the top rod is fixed to the center of the pressing plate, the other end of the top rod passes through the adjusting hole, and one side of the pressing plate abuts against the rigid sheet; The adjusting seat is fixed on the base, and is located on different sides of the base respectively with the pressing plate, and the top rod passes through the adjusting seat; The knob is threadedly connected with the adjusting seat, and is gap-fitted with the top rod, and the knob can drive the pressing block to move when rotating.

10. The pressure detection calibration device of claim 9, wherein, The side of the pressing plate abutting against the rigid sheet in the axial direction is annular, and the side of the pressing plate away from the rigid sheet is provided with a plurality of through air holes.

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