X-ray machine

Abstract

The invention discloses an X-ray machine which comprises a box body, a cover body and a pressure adjusting layer located between the box body and the cover body, the edge of the pressure adjusting layer is fixed between the box body and the cover body, and the pressure adjusting layer sinks towards the interior of the box body. The pressure adjusting layer is used for achieving sealing between the box body and the cover body and controlling pressure balance in the box body. The pressure adjusting layer comprises a sealing part and an adjusting part, the sealing part is fixed between the box body and the cover body, the remaining part, except the sealing part, of the pressure adjusting layer is the adjusting part, and the adjusting part is used for adjusting the internal pressure of the box body; the pressure adjusting layer is formed by a sealing sheet which is not hollowed out and is of a sheet-shaped structure; when the X-ray machine is sealed, a layer of fully-covered sealing sheet is arranged between the box body and the cover body of the X-ray machine, and the box body is filled with liquid and then is inflated to discharge part of the liquid, so that sealing and internal and external pressure balance can be realized at the same time.

Description

[0001] This application is a divisional application of the invention patent application with the application date of June 8, 2023, application number 2023106739815, and invention name “X-ray machine and its sealing method”. Technical Field

[0002] The present invention particularly relates to an X-ray machine. Background Art

[0003] Existing X-ray machines require high voltage to generate radiation, and generate a large amount of heat energy at the same time. Therefore, X-ray machines need to use liquid insulating oil to achieve their insulation and heat dissipation functions.

[0004] Since insulating oil is liquid, the equipment needs to have good sealing requirements to prevent leakage of insulating oil from polluting the environment or even causing failure of the X-ray machine. At the same time, because insulating oil expands and contracts with changes in temperature, it causes uneven pressure inside and outside the X-ray machine. Therefore, the X-ray machine needs to be equipped with a pressure buffer airbag to balance the pressure inside and outside the equipment.

[0005] Therefore, existing commercially available X-ray machines require independent oil sealing and pressure equalization components to achieve oil sealing and internal and external pressure balance. The oil sealing component is generally a rubber ring or O-ring, and the pressure equalization component is generally a pressure buffer airbag. For example, the Chinese invention patent application with application number 2011100443773, entitled "Sealing Gasket and Tube Sealing Method," discloses that a sealing ring is used between the cover and the box body to achieve sealing, while an oil filling port is provided on the cover body, and an additional pressure equalization component is provided on the oil filling port. Another example is the application with application number 2012100036593, entitled "Radiation Device Installation Box and X-ray Generator," which discloses that a sealing strip is provided between the second box cover and the box body to achieve sealing between the box cover and the box body. Furthermore, the box cover is provided with an additional compensation device for achieving pressure equalization.

[0006] It can be seen that the existing X-ray machine needs to use at least two components to achieve the purpose of sealing and pressure balance respectively, which leads to a large number of equipment parts, a complex structure, a large size, and cumbersome installation and maintenance. Summary of the Invention

[0007] In view of this, in order to overcome the defects of the prior art, an object of the present invention is to provide an X-ray machine that uses one component to achieve the purposes of sealing and pressure balance at the same time.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A sealing method for an X-ray machine comprises the following steps:

[0010] A sealing sheet is provided between the housing and the cover of the X-ray machine, and the edge of the sealing sheet is fixed between the cover and the housing. The size of the sealing sheet matches the size of the cover; specifically, the size of the sealing sheet needs to cover the opening of the housing;

[0011] The box body is provided with a liquid filling port and a liquid discharge port; liquid is injected into the box body through the liquid filling port of the X-ray machine, and the box body is filled with liquid, and then the liquid filling port is closed;

[0012] The cover body has a through hole extending through the thickness thereof, and gas is injected into the space between the sealing sheet and the cover body through the through hole, causing the sealing sheet to be recessed toward the inside of the box body to form a pressure regulating layer; while the sealing sheet is recessed toward the inside of the box body, liquid in the box body overflows outward through the drain port;

[0013] The liquid discharge port of the X-ray machine is closed and the gas injection is stopped. The pressure regulating layer maintains a concave shape toward the box body; the pressure regulating layer is used to achieve a seal between the box body and the cover body and control the pressure balance in the box body; the liquid injection port is located at the lower part of the box body, and the liquid discharge port is located at the upper part of the box body;

[0014] The volume L of the gas filled is determined by the following formula:

[0015] L = c × v × (t1 - t2) + A;

[0016] Where c is the expansion coefficient of the injected liquid, v is the total volume of the injected liquid, that is, the volume of the liquid when the cavity of the box is filled with liquid, t1 is the upper limit of the operating temperature set by the X-ray machine, t2 is the actual temperature of the liquid when the gas is filled, and A is the inflation margin, which is greater than or equal to 0.

[0017] The sealing sheet in this application is a solid, uncut sheet. The dimensions of the sealing sheet match those of the cover, preferably with the entire sealing sheet being equal to the dimensions of the cover. Furthermore, the cover is preferably larger than the box opening so that the sealing sheet and cover completely cover the box opening.

[0018] In some embodiments, the inflation amount is controlled by collecting the liquid overflowing from the drain port and observing the overflow volume.

[0019] According to some preferred implementation aspects of the present invention, the sealing sheet is made of rubber.

[0020] Preferably, the sealing sheet is made of nitrile rubber and has an operating temperature of -35°C to 105°C.

[0021] According to some preferred embodiments of the present invention, the sealing sheet has a Shore hardness of 70±5HA, a tensile strength of 8-12 MPa, and an elongation of 200-350%.

[0022] According to some preferred embodiments of the present invention, the thickness of the sealing sheet is 1 to 2 mm. If the thickness is too thick, pressure adjustment will be greatly hindered.

[0023] In some embodiments, the sealing sheet preferably has a Shore hardness of 70HA, a tensile strength of 10 MPa, an elongation of 250%, and a thickness of 1.5 to 1.6 mm.

[0024] According to some preferred embodiments of the present invention, the box body has a cavity for accommodating devices and liquids, and the size of the sealing sheet and the size of the cover body are larger than the size of the opening of the cavity close to the cover body, so as to completely cover the cavity opening to achieve the purpose of sealing and subsequent pressure balance.

[0025] According to some preferred embodiments of the present invention, one end of the box body, adjacent to the lid body, is bent outward to form a bent portion, and the edges of the sealing sheet, the lid body, and the bent portion are secured to the box body by fasteners. Fastening the sealing sheet to the outside of the box body provides a better sealing effect than securing the box body by extending the sealing sheet inward. In some embodiments, the sealing sheet, lid body, and bent portion of the box body are identical in size, meaning that the sealing sheet and lid body completely cover the bent portion of the box body to seal the box body opening. No additional components exist between the three.

[0026] According to some preferred embodiments of the present invention, the through-holes include a central hole located at the center of the cover body and / or peripheral holes evenly spaced around the center of the cover body. Preferably, both the central hole and the peripheral holes are provided simultaneously and of equal size to achieve rapid and uniform inflation.

[0027] According to some preferred embodiments of the present invention, the liquid is insulating oil, such as 45# liquid insulating oil.

[0028] Another object of the present invention is to provide an X-ray machine prepared according to the sealing method as described above, comprising a box body, a cover body, and a pressure regulating layer located between the box body and the cover body, the edge of the pressure regulating layer being fixed between the box body and the cover body, the pressure regulating layer being recessed toward the interior of the box body, and the pressure regulating layer being used to achieve sealing between the box body and the cover body and to control the pressure balance in the box body.

[0029] According to some preferred embodiments of the present invention, the pressure regulating layer includes a sealing portion and a regulating portion. The sealing portion is fixed between the box body and the cover body. The remaining portion of the pressure regulating layer excluding the sealing portion is the regulating portion, which is used to adjust the pressure inside the box body. The regulating portion is spherical.

[0030] Compared with the prior art, the advantages of the present invention are as follows: the X-ray machine of the present invention adopts a fully covered sealing sheet set between the box body and the cover body of the X-ray machine, and adopts the method of filling the box body with liquid and then inflating to discharge part of the liquid, so that the sealing sheet forms a pressure regulating layer, which can not only achieve sealing, but also achieve the purpose of pressure adjustment at the same time to maintain the balance of internal and external pressures; and the pressure regulating layer is set inside, which further reduces the size of the equipment and saves the amount of liquid inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of an X-ray machine in a preferred embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the stacked structure of an X-ray machine in a preferred embodiment of the present invention;

[0034] Figure 3 This is a schematic structural diagram of a sealing sheet in a preferred embodiment of the present invention;

[0035] Figure 4 This is a schematic structural diagram of a pressure regulating layer in a preferred embodiment of the present invention;

[0036] Figure 5 for Figure 4 Cross-section of the middle AA;

[0037] Figure 6 Schematic diagram of the cross-sectional structure of the X-ray machine when the liquid inside the box expands due to heat in a preferred embodiment of the present invention;

[0038] Figure 7 Schematic diagram of the cross-sectional structure of the X-ray machine when the liquid inside the box contracts upon cooling in a preferred embodiment of the present invention;

[0039] In the accompanying drawings, there are X-ray machine-1, box-2, bending part-21, cavity-22, cover-3, through hole-31, pressure regulating layer-4, sealing part-41, regulating part-42, sealing sheet-5, fastener-6, liquid filling port-71, and liquid discharge port-72. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] To achieve oil sealing and internal and external pressure balance in X-ray machines, existing X-ray machines require O-rings for oil sealing and pressure-buffer bladders for pressure balance. This complicates the overall X-ray machine structure and increases its size. The added components increase costs and complicate installation and maintenance. The large size of the overall device is unfavorable to the market demand for increasingly compact designs. Furthermore, the existing pressure-buffer bladder is complex and is molded using a hot-melt process. Its lifespan is significantly shorter than the overall device lifespan, creating the risk of additional insulating oil leakage as the bladder ages.

[0042] The X-ray machine 1 of the present application adopts an integrated design of an airbag sealing sheet, which on the one hand ensures the oil seal between the box body 2 and the cover body 3, and on the other hand, the expansion and contraction of the airbag sealing sheet (pressure regulating layer 4) keeps the pressure inside and outside the equipment balanced, so that the single pressure regulating layer 4 can simultaneously realize the functions of the sealing sheet and the pressure buffer airbag, simplifying the overall structure of the equipment, reducing the amount of insulating oil used, reducing the cost of the equipment, simplifying the installation and maintenance steps, and the overall equipment size is compact, which can meet more market application environments.

[0043] like Figure 1-7 As shown, the X-ray machine 1 in this embodiment includes a housing 2, a cover 3, and a pressure regulating layer 4 located between the housing 2 and the cover 3. The edge of the pressure regulating layer 4 is fixed between the housing 2 and the cover 3, and the pressure regulating layer 4 is recessed toward the interior of the housing 2. The pressure regulating layer 4 is used to achieve a seal between the housing 2 and the cover 3 and to control the pressure balance within the housing 2. The pressure regulating layer 4 includes a sealing portion 41 and a regulating portion 42. The sealing portion 41 is fixed between the housing 2 and the cover 3. The remaining portion of the pressure regulating layer 4 excluding the sealing portion 41 is the regulating portion 42, which is used to adjust the pressure within the housing 2. The regulating portion 42 is spherical during operation.

[0044] When the actual operating temperature of the equipment is lower than the temperature when the equipment is filled with oil and gas, the insulating oil inside the equipment will shrink in volume when it is cooled, and the regulating part 42 of the pressure regulating layer 4 will automatically expand and increase the deformation amount, so as to keep the internal insulating oil and the external atmospheric pressure consistent. Figure 7As shown; when the actual operating temperature of the device is higher than the temperature when the device is filled with oil and gas, the insulating oil inside the device expands in volume due to heat, and the regulating portion 42 of the pressure regulating layer 4 automatically contracts to reduce the deformation, so as to keep the internal insulating oil and the external atmospheric pressure consistent, as shown Figure 6 As shown, the sealing portion 41 of the pressure regulating layer 4 is fixed between the housing 2 and the cover 3 to achieve a sealing effect. In other words, the pressure regulating layer 4 formed by the sealing sheet 5 in the X-ray machine 1 of this embodiment can simultaneously achieve both oil sealing and internal and external pressure balance. This results in a compact structure, small size, fewer parts, and lower costs.

[0045] In this embodiment, the X-ray machine 1 is manufactured using the following sealing method, which specifically includes the following steps:

[0046] Step 1: Set the sealing sheet 5

[0047] A sealing sheet 5 is provided between the housing 2 and the cover 3 of the X-ray machine 1, and the edge of the sealing sheet 5 is fixed between the cover 3 and the housing 2. Figure 3 As shown, the sealing sheet 5 is a flat rubber gasket structure that is complete and has no hollowing in the middle, and its edge is provided with mounting holes for fixation.

[0048] The box body 2 has a cavity 22 for accommodating devices and liquids. The size of the sealing sheet 5 matches the size of the cover body 3. Preferably, the size of the entire sealing sheet 5 is equal to the size of the cover body 3, and the size of the sealing sheet 5 and the size of the cover body 3 are larger than the size of the opening of the cavity 22 close to the side of the cover body 3, so as to completely cover the opening of the cavity 22 to achieve the purpose of sealing and subsequent pressure balance.

[0049] In this embodiment, one end of the box body 2 near the cover body 3 is bent outward to form a bent portion 21. The edge of the sealing sheet 5, the edge of the cover body 3, and the bent portion 21 are fixed by fasteners 6. The fasteners 6 are screw assemblies or screw assemblies. The fasteners 6 are evenly distributed to achieve uniform force and ensure the assembly and fixation between the three. By fixing on the outside of the box body, a better sealing effect can be achieved compared to the method of extending inward to fix. In this embodiment, the sealing sheet 5, the cover body 3, and the bent portion 21 of the box body 2 are exactly the same size. That is, the sealing sheet 5 and the cover body 3 completely cover the bent portion 21 of the box body 2 to seal the opening of the box body 2, and there are no other additional components between the three.

[0050] In this embodiment, the sealing sheet 5 is made of nitrile rubber and has an operating temperature of -35°C to 105°C. The sealing sheet 5 has a Shore hardness of 70HA, a tensile strength of 10 MPa, and an elongation of 250%. The thickness is 1.5 to 1.6 mm.

[0051] In some other embodiments, the sealing sheet 5 preferably has a Shore hardness of 70±5HA, a tensile strength of 8-12 MPa, an elongation of 200-350%, and a thickness of 1-2 mm.

[0052] Step 2: Injection

[0053] In this embodiment, the housing 2 is provided with a liquid inlet 71 and a liquid outlet 72. Liquid is injected into the housing 2 through the liquid inlet 71 of the X-ray machine 1 until the housing 2 is completely filled with the liquid, and then the liquid inlet 71 is closed. In this embodiment, the liquid is insulating oil, such as 45# liquid insulating oil.

[0054] Step 3: Inflation and drainage

[0055] The cover body 3 has through holes 31 extending through the thickness thereof, including a central hole located at the center of the cover body 3 and peripheral holes evenly spaced around the central hole. The central hole and the peripheral holes have the same size to achieve rapid and uniform inflation.

[0056] Gas is injected into the space between the sealing sheet 5 and the cover 3 through the through-hole 31, causing the sealing sheet 5 to indent toward the interior of the housing 2, thereby forming the pressure-regulating layer 4. As the sealing sheet 5 indents toward the interior of the housing 2, the liquid within the housing 2 is pressurized and overflows through the drain port 72. In this embodiment, the amount of gas injected is controlled by collecting the liquid that overflows through the drain port 72 and measuring its overflow volume.

[0057] In this embodiment, the volume L of the gas filled is determined by the following formula:

[0058] L = c × v × (t1 - t2) + A;

[0059] Wherein, c is the expansion coefficient of the injected liquid, v is the initial total volume of the injected liquid, that is, the volume of the liquid when the cavity 22 of the box body 2 is filled with liquid, t1 is the upper limit of the operating temperature set by the X-ray machine, t2 is the actual temperature of the liquid when the gas is filled, and A is the inflation margin, which is greater than or equal to 0.

[0060] Assuming the total volume of oil in a fully filled device is 15 liters, and the device's upper operating temperature limit is 65°C, the device remains safe even if the pressure-regulating layer 4 is in close contact with the cover 3 at 65°C. This is because the device has reached its upper temperature limit and the insulating oil will no longer expand and increase in pressure. However, to account for safety, a safety margin A is set for the pressure-regulating layer 4 to allow for a certain expansion volume at 65°C. This allows for compression and buffering even if the device continues to heat up and the insulating oil continues to expand, further ensuring safety.

[0061] Assuming that the measured temperature of the insulating oil during inflation and oil drainage is 60°C, the expanded volume of the oil is calculated according to the formula c×v×(t1-t2), where c is the expansion coefficient of the insulating oil (0.00076 / °C), v is the initial total volume of the injected insulating oil, and the temperature difference is equal to 65-60=5°C. The expanded volume of the insulating oil is 0.00076*15*5 (liters), plus the safety margin A, which is the inflation volume.

[0062] Then, the drain port 72 of the X-ray machine 1 is closed and the gas injection is stopped, and the pressure regulating layer 4 maintains a shape that is concave toward the inside of the box body 2 ; the pressure regulating layer 4 is used to achieve sealing and control the pressure balance in the box body 2 .

[0063] This embodiment utilizes the excellent ductility and elasticity of rubber to deform the sealing sheet 5, forming a pressure-regulating layer 4 to achieve the function of a cushioning airbag. During actual use of the device, the pressure generated by the thermal expansion and contraction of the internal insulating oil acts on the pressure-regulating layer 4, causing the regulating portion 42 of the pressure-regulating layer 4 to deform, contract, or expand, thereby maintaining the pressure balance between the insulating oil environment inside the device and the external atmospheric pressure. During the pressure adjustment process, the through-hole 31 of the device cover 3 transforms into a connecting hole that connects the pressure-regulating layer 4 to the external atmosphere. Specifically, when the actual operating temperature of the device is lower than the temperature at which the device is filled and aerated, the insulating oil inside the device contracts in volume due to cooling, and the regulating portion 42 of the pressure-regulating layer 4 automatically expands and increases its deformation, thereby maintaining the internal insulating oil pressure consistent with the external atmospheric pressure. When the actual operating temperature of the device is higher than the temperature at which the device is filled and aerated, the insulating oil inside the device expands in volume due to heating, and the regulating portion 42 of the pressure-regulating layer 4 automatically contracts and reduces its deformation, thereby maintaining the internal insulating oil pressure consistent with the external atmospheric pressure. At the same time, the sealing portion 41 of the pressure-regulating layer 4 is locked tightly against the device housing 2 and cover 3, maintaining its original position. This prevents the leakage of insulating oil from the device and provides a complete sealing effect for the device. This ultimately achieves an integrated design using a single sealing sheet 5, simultaneously achieving both device sealing and pressure balance.

[0064] The sealing method of the X-ray machine 1 of the present invention adopts a method of setting a fully covering sealing sheet 5 or sealing sheet between the box body 2 and the cover body 3 of the X-ray machine 1, and after the box body 2 is filled with liquid, it is inflated to discharge part of the liquid, so that the sealing sheet 5 forms a pressure regulating layer 4, which can simultaneously achieve the purposes of sealing and pressure adjustment and maintain the balance of internal and external pressures; and the pressure regulating layer 4 is set inside, which further reduces the size of the equipment, saves the amount of liquid inside the box body 2, and has excellent stability and life.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An X-ray machine, characterized in that: The invention comprises a box body, a cover body and a pressure regulating layer located between the box body and the cover body, the edge of the pressure regulating layer is fixed between the box body and the cover body, the pressure regulating layer is recessed toward the interior of the box body, and the pressure regulating layer is used to achieve sealing between the box body and the cover body and to control the pressure balance in the box body; the pressure regulating layer comprises a sealing part and a regulating part, the sealing part is fixed between the box body and the cover body, the remaining part of the pressure regulating layer excluding the sealing part is the regulating part, and the regulating part is used to adjust the pressure inside the box body; the pressure regulating layer is formed by a sealing sheet with a non-hollow sheet structure; when the X-ray machine is sealed, a fully covered sealing sheet is arranged between the box body and the cover body of the X-ray machine, and the box body is filled with liquid and then inflated to discharge part of the liquid, so that the sealing sheet forms a pressure regulating layer.

2. The X-ray machine according to claim 1, wherein: The adjusting portion is in a spherical crown shape during operation.

3. The X-ray machine according to claim 1, wherein: When the gas is inflated to discharge part of the liquid, the amount of gas is controlled by collecting the liquid overflowing outwards and observing the overflow volume.

4. The X-ray machine according to claim 1, wherein: When the actual operating temperature of the X-ray machine is lower than the temperature when the X-ray machine is filled with oil and air, the liquid inside the X-ray machine shrinks in volume when it is cooled, and the regulating part of the pressure regulating layer automatically expands and increases the deformation amount, thereby keeping the internal liquid and external atmospheric pressure consistent.

5. The X-ray machine according to claim 1, wherein: When the actual operating temperature of the X-ray machine is higher than the temperature when the X-ray machine is filled with oil and inflated, the liquid inside the X-ray machine expands in volume due to heat, and the regulating part of the pressure regulating layer automatically contracts to reduce the deformation, thereby keeping the internal liquid and external atmospheric pressure consistent.

6. The X-ray machine according to claim 1, wherein: The sealing sheet is made of rubber.

7. The X-ray machine according to claim 1, wherein: The sealing sheet is made of nitrile rubber and has an operating temperature of -35°C to 105°C.

8. The X-ray machine according to claim 1, wherein: The sealing sheet has a Shore hardness of 70±5HA, a tensile strength of 8-12 MPa, and an elongation of 200-350%.

9. The X-ray machine according to claim 1, wherein: The thickness of the sealing sheet is 1-2 mm, and the size of the sealing sheet needs to cover the opening of the box.

10. The X-ray machine according to claim 1, wherein: The box body is provided with a cavity for accommodating devices and liquids, and the size of the sealing sheet is larger than the size of the opening of the cavity close to the cover body.

11. The X-ray machine according to claim 1, wherein: One end of the box body close to the cover body is bent outward to form a bent portion, and the edge of the sealing sheet, the edge of the cover body and the bent portion are fixed by fasteners.

12. The X-ray machine according to claim 1, wherein The cover body is provided with through holes extending through the thickness direction thereof, and the through holes include a central hole located at the center of the cover body and / or peripheral holes evenly spaced around the center of the cover body.

13. The X-ray machine according to claim 1, wherein: The liquid is insulating oil.

14. The X-ray machine according to claim 1, wherein: The box body is provided with a liquid filling port and a liquid discharge port. The liquid filling port is located at the lower part of the box body, and the liquid discharge port is located at the upper part of the box body.

15. The X-ray machine according to any one of claims 1 to 14, characterized in that: The X-ray machine is sealed by the following steps: Fixing the edge of the sealing sheet between the cover and the box body; Injecting liquid into the box through the liquid injection port of the X-ray machine until the box is filled with liquid, and then closing the liquid injection port; Gas is injected into the space between the sealing sheet and the cover through the through hole, causing the sealing sheet to be recessed toward the box body to form a pressure regulating layer; while the sealing sheet is recessed toward the box body, the liquid in the box body overflows outward through the drain port; The drain port of the X-ray machine is closed and the gas injection is stopped, and the pressure regulating layer maintains a concave shape toward the inside of the box; the pressure regulating layer is used to achieve sealing between the box and the cover and control the pressure balance in the box.

16. The X-ray machine according to claim 15, characterized in that The volume L of the gas filled is determined by the following formula: L = c × v × (t1 - t2) + A; Where c is the expansion coefficient of the injected liquid, v is the total volume of the injected liquid, t1 is the upper limit of the operating temperature set by the X-ray machine, t2 is the actual temperature of the liquid when the gas is filled, and A is the inflation margin, which is greater than or equal to 0.

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