A pressure tapping structure

Abstract

The application provides a pressure tapping pipe structure, and relates to the technical field of pressure tapping pipes. The pressure tapping pipe structure is installed in an annular cavity formed by an inner tank body and an outer tank body. The pressure tapping pipe structure comprises a liquid-phase pipe. The liquid-phase pipe comprises a vertical section, which is in communication with the inner tank body and is used for allowing liquid in the inner tank body to enter. The liquid-phase pipe is provided with the vertical section combined with a connecting piece, a horizontal section connected to the lower end of the vertical section, a spiral section formed by bending the other end of the horizontal section, and a connecting section connected to the other end of the spiral section. The user can directly heat and vaporize the low-temperature liquid in the inner tank body for use, so that the occurrence of frost and dew on the indicating disc surface caused by the low-temperature liquid entering the differential pressure liquid level meter is avoided. The user does not need to additionally pour other liquid into the liquid-phase pipe for use, and the purpose of facilitating use is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure tapping pipe, in particular to a pressure tapping pipe structure. BACKGROUND

[0002] Because of the adiabatic design and the closed requirement of the low-temperature storage device, the liquid level measurement of the low-temperature liquid has its special difficulties compared with the liquid level measurement of the normal-temperature liquid. For example, the traditional float ball type and glass plate liquid level meter has the problems of large heat transfer, difficult installation and removal, frosting, low-temperature brittle fracture, static electricity accumulation and the like. At present, most of the new types of liquid level measurement instruments, such as the capacitive type, optical fiber type, radiation type and thermal type, are still in the laboratory stage. Therefore, most of the low-temperature storage devices still use the differential pressure type liquid level meter. The differential pressure type liquid level meter includes two pressure tapping pipes, one is the gas phase pressure tapping pipe for measuring the pressure of the gas phase space at the top of the tank, also known as the negative pressure tapping pipe, and the other is the liquid phase pressure tapping pipe for measuring the pressure of the liquid at the bottom of the tank, also known as the positive pressure tapping pipe. When the liquid level height is different, the pressure difference of the two is also different due to the influence of the gravity of the liquid, and the higher the liquid level, the greater the pressure difference. Therefore, when using the differential pressure type liquid level meter, only the corresponding relationship between the liquid level height and the pressure difference is input in advance, the liquid level height of the liquid can be measured.

[0003] In the application No. CN108168647A, a kind of low-temperature liquefied gas tank differential pressure type liquid level meter high pressure end pressure tapping pressure stabilizing device, including differential pressure type liquid level meter being connected with the high pressure end pressure tapping mouth and low pressure end pressure tapping mouth of tank respectively through pressure pipe, anti-fluctuation buffer cover is fixedly arranged on the high pressure end pressure tapping mouth in tank, at least one liquid inlet hole is arranged around the anti-fluctuation buffer cover;Damping pipe consisting of multiple sections of bent pipe is arranged in the anti-fluctuation buffer cover, one end of the damping pipe is vertically upward, and the other end is connected to the high pressure end pressure tapping mouth and communicated with the differential pressure type liquid level meter.

[0004] Because the low-temperature liquid in the low-temperature liquefied gas tank enters the differential pressure liquid level meter, frost and dew will be formed on the indicating disc surface, thereby seriously affecting the correct indication of the liquid level meter. The pressure tapping pipe of the application needs to be additionally filled with liquid in the liquid phase pipe, and cannot be directly used for the low-temperature liquid in the tank body. The size of the liquid inlet hole will affect the speed of the liquid entering the anti-fluctuation buffer cover inside the tank body, but the application cannot adjust the size of the liquid inlet hole, which is inconvenient to use. SUMMARY

[0005] The present application aims to provide a pressure tapping pipe structure, which aims to solve the problem that the pressure tapping pipe structure in the prior art is not convenient for direct use of the low-temperature liquid in the tank and cannot adjust the liquid inlet speed inside the anti-fluctuation buffer cover.

[0006] To achieve the above object, the application adopts the following technical scheme: the pressure taking pipe structure is installed in the annular cavity formed by the inner tank body and the outer tank body, and characterized in that it comprises a liquid phase pipe which comprises:

[0007] a vertical section in communication with the inner tank body for the liquid in the inner tank body to enter;

[0008] a horizontal section connected with one end of the vertical section, and the liquid entering the horizontal section can be heated to gas;

[0009] a spiral section connected with the other end of the horizontal section and in a spiral ascending shape, the top of the spiral section being higher than the horizontal section, and when the liquid is in a non-heated state, the liquid is maintained in the horizontal section to form a liquid seal;

[0010] a connecting section connected with the other end of the spiral section, and the other end of the connecting section being used for connecting the differential pressure liquid level meter.

[0011] Further technical scheme of the application is that a threaded hole for mounting the connecting piece is formed in the inner tank body, a first limiting ring for limiting the connecting piece is fixedly connected to the bottom of the inner tank body wall, and a second threaded hole for mounting the liquid phase pipe is formed in one end of the connecting piece inside the annular cavity.

[0012] Further technical scheme of the application is that an outer threaded sleeve ring is mounted to the bottom of the inner tank body wall, a sealing washer is sleeved to the outer surface of the first limiting ring, a liquid phase pipe cap is overlapped to the upper surface of the sealing washer, a first liquid inlet hole for guiding the liquid inside the inner tank body into the liquid phase pipe cap is formed in the middle of the outer circumferential sidewall of the liquid phase pipe cap, an outer pipe cap is inserted into the inner tank body, the outer pipe cap is sleeved to the outer surface of the liquid phase pipe cap, a fixing ring is fixedly connected to the bottom of the outer surface of the outer pipe cap, a limiting sleeve for limiting the fixing ring is threadedly connected to the outer surface of the outer threaded sleeve ring, the liquid phase pipe cap inside the outer pipe cap is mounted at the same time as the outer pipe cap is mounted, two groups of second liquid inlet holes are formed in the outer surface of the outer pipe cap, the hole diameters of the two groups of second liquid inlet holes are different, and one group of the second liquid inlet holes is selected to correspond to the position of the first liquid inlet hole to adjust the size of the liquid inlet hole.

[0013] Further technical scheme of the application is that an outer threaded connecting sleeve is fixedly connected to the bottom of the inner tank body wall through a connecting strip, a second fixing piece is threadedly connected to the outer surface of the outer threaded connecting sleeve, a second connecting groove for mounting a sealing block is formed in the bottom of the inner wall of the second fixing piece, and the liquid phase pipe with the sealing block mounted thereon can also be mounted and fixed.

[0014] Further, the bottom of the inner wall of the inner tank body is provided with a fourth limiting ring for limiting the connecting piece, the inner wall of the fourth limiting ring and the inner wall of the first threaded hole are fixedly connected with a plurality of first limiting blocks distributed in a circle, the outer surface of the top of the connecting piece is fixedly connected with a plurality of second limiting blocks also distributed in a circle, the number of the second limiting blocks is same as that of the first limiting blocks of the inner wall of the fourth limiting ring and also distributed in a circle, and the bottom of the second limiting block is overlapped with the top of the first limiting block of the inner wall of the fourth limiting ring, so that the first limiting block limits the connecting piece provided with the second limiting block.

[0015] Further, the bottom of the outer wall of the inner tank body is provided with an internally threaded sleeve for mounting the first fixing piece, the first fixing piece is used for limiting the fourth sealing ring, the bottom of the inner wall of the first fixing piece is provided with a first connecting groove, the fourth sealing ring is slidably connected in the internally threaded sleeve, the fourth sealing ring is used for limiting the top of the internally threaded sleeve, the fourth sealing ring is fixedly connected with a plurality of limiting strips distributed in a circle, the number of the limiting strips is same as that of the second limiting blocks, and the plurality of limiting strips are located between adjacent two second limiting blocks, so as to limit the rotation of the connecting piece fixedly connected with the second limiting block.

[0016] Further, the first limiting ring and the bottom wall of the inner tank body form a first mounting groove for mounting the first sealing ring, the bottom of the outer wall of the inner tank body is fixedly connected with a second limiting ring, the second limiting ring and the inner wall of the inner tank body form a second mounting groove for mounting the second sealing ring, and the first sealing ring and the second sealing ring are respectively used for sealing the edges at both ends of the first threaded hole.

[0017] Further, the connecting piece is threadedly connected in the first threaded hole, the top of the connecting piece is overlapped with the first sealing ring, the first limiting ring can limit the connecting piece, the bottom of the outer surface of the connecting piece is fixedly connected with a third limiting ring, the top of the third limiting ring is overlapped with the second sealing ring, the third limiting ring is located in the second limiting ring, the third limiting ring is used for limiting the second sealing ring, and the top of the inner wall of the second threaded hole is provided with a third sealing ring for sealing the joint of the liquid phase pipe.

[0018] Further, one end of the liquid phase pipe is threadedly connected in the second threaded hole through the externally threaded sleeve, the one end of the liquid phase pipe fixedly connected with the externally threaded sleeve is overlapped with the third sealing ring, the middle part of the liquid phase pipe is sleeved with a heat conduction mechanism, and the heat conduction mechanism is fixedly connected to the bottom of the inner wall of the outer tank body.

[0019] Further technical solutions of the present application are that the liquid phase pipe cap is installed at the bottom of the inner wall of the inner tank, the sidewall of the liquid phase pipe cap is provided with a first liquid inlet hole for guiding the liquid in the inner tank into the liquid phase pipe cap, the liquid in the inner tank enters the liquid phase pipe cap and the liquid surface is flush with the bottom, a high-pressure gas cavity is formed above the liquid surface in the liquid phase pipe cap, the connecting piece is flush with the bottom of the first liquid inlet hole, the liquid phase pipe cap guides a part of the liquid entering the inside thereof to the inside of the liquid phase pipe through the connecting piece, and the heat conduction mechanism heats a part of the liquid in the horizontal section of the liquid phase pipe to vaporize into gas, which is buffered through the spiral section and enters the differential pressure liquid level meter. After the differential pressure liquid level meter accurately reads, the heating of the heat conducting wire stops. Due to the existence of the spiral section, the liquid entering the liquid phase pipe is maintained on the horizontal section to form a liquid seal.

[0020] The present application has the following beneficial effects:

[0021] 1. By setting the liquid phase pipe as a vertical section combined with the connecting piece, a horizontal section connected to the lower end of the vertical section, a spiral section curved from the other end of the horizontal section, and a connecting section connected to the other end of the spiral section, the spiral section is set as a spiral upward, and a heat conduction mechanism is arranged outside the horizontal section to heat the low-temperature liquid inside, which can directly heat and vaporize the low-temperature liquid in the inner tank for use, thereby avoiding the low-temperature liquid entering the differential pressure liquid level meter to cause the frost and dew on the indicating disc, and the user does not need to additionally pour other liquids into the liquid phase pipe for use, achieving the purpose of easy use.

[0022] 2. By setting the first limiting ring on the upper surface of the inner tank to install the first sealing ring, setting the second limiting ring on the top of the inner wall of the inner tank to install the second sealing ring, thereby installing the connecting piece screwed into the first threaded hole, and setting the second threaded hole on the bottom of the connecting piece to install the liquid phase pipe, and setting the third sealing ring on the top of the inner wall to increase the sealing effect of the connection between the liquid phase pipe and the connecting piece, the user can conveniently disassemble and maintain the connecting piece and the liquid phase pipe, achieving the purpose of easy disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a sectional view of the first embodiment of the present application.

[0024] Figure 2 is a sectional view of the first embodiment of the present application.

[0025] Figure 3 is a sectional view of the first embodiment of the present application. Figure 2 is an enlarged view of the structure at A in the present application.

[0026] Figure 4This is a schematic diagram of the structure of the first embodiment of the present invention.

[0027] Figure 5 This is an exploded cross-sectional view of the second embodiment of the present invention.

[0028] Figure 6 This is a cross-sectional view of the second embodiment of the present invention.

[0029] Figure 7 This is a cross-sectional view of the third embodiment of the present invention.

[0030] Figure 8 This is the present invention. Figure 7 Enlarged view of the structure at point B in the middle.

[0031] In the diagram: 1-Inner tank body, 11-First threaded hole, 12-First limiting ring, 12a-First mounting groove, 13-First sealing ring, 14-Second limiting ring, 14a-Second mounting groove, 15-Second sealing ring, 16-Fourth limiting ring, 17-First limiting block, 18-Internal threaded sleeve, 19-First fixing component, 110-Fourth sealing ring, 111-First connecting groove, 112-External threaded collar, 113-Sealing gasket, 114-Limiting sleeve, 115- Connecting sleeve, 116-Second fixing piece, 117-Second connecting groove, 118-Limiting strip, 2-Connecting piece, 21-Second threaded hole, 22-Third sealing ring, 23-Third limiting ring, 24-Second limiting block, 3-Liquid phase tube, 301-, 302-, 303-, 304-, 31-External threaded sleeve, 32-Sealing block, 4-Liquid phase tube cap, 41-First liquid inlet hole, 42-Outer tube cap, 43-Fixing ring, 44-Second liquid inlet hole, 5-Heat conduction mechanism. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the present invention provides a pressure tapping pipe structure, which is installed in the annular cavity 1b formed by the inner tank 1 and the outer tank 1a;

[0034] like Figures 1-4 As shown, this is the first embodiment of the present invention, a pressure tapping pipe structure, including a first threaded hole 11 opened in the bottom wall of the inner tank 1, the two ends of the connector 2 are respectively located inside the inner tank 1 and inside the annular cavity 1b, the end of the connector 2 located inside the annular cavity 1b is threadedly connected to a liquid phase pipe 3, a liquid phase pipe cap 4 is installed at the bottom of the inner wall of the inner tank 1 to cover one end of the connector 2 to buffer the fluctuations caused by the liquid inside the inner tank 1, and a heat conduction mechanism 5 is installed at the bottom of the inner wall of the outer tank 1a to heat the liquid phase pipe 3;

[0035] like Figures 2-3As shown, the bottom of the inner wall of the inner tank body 1 is provided with a first limiting ring 12 for limiting the connecting piece 2, the cross section of the first limiting ring 12 is L-shaped, and the first limiting ring 12 and the bottom wall of the inner tank body 1 form a ring-shaped first mounting groove 12a, the first mounting groove 12a is internally provided with a first sealing ring 13, the first sealing ring 13 and the connecting piece 12 are mutually overlapped to seal the top of the connecting part of the first threaded hole 11 and the connecting piece 2, preventing the fluid in the inner tank body 1 from flowing into the ring cavity 1b through the gap of the first threaded hole 11;

[0036] The bottom of the outer wall of the inner tank body 1 is fixedly connected with a second limiting ring 14, the second limiting ring 14 and the outer wall of the inner tank body 1 form a ring-shaped second mounting groove 14a, the second mounting groove 14a is internally provided with a second sealing ring 15, the second sealing ring 15 is also mutually overlapped with the connecting piece 2 to seal the bottom of the connecting part of the first threaded hole 11 and the connecting piece 2, further improving the sealing effect;

[0037] As shown in Figure 2 and 4 The middle of the outer surface of the liquid phase pipe cap 4 is provided with two first liquid inlet holes 41 for guiding the liquid in the inner tank body 1 into the inside, the two first liquid inlet holes 41 are symmetrically distributed, the liquid in the inner tank body 1 enters the inside of the liquid phase pipe cap 4 and is flush with the bottom of the first liquid inlet hole 41, so that the area above the liquid level in the inside of the liquid phase pipe cap 4 forms a high-pressure gas cavity, the liquid phase pipe cap 4 covers the end of the connecting piece 2 extending into the inner tank body 1 and guides the liquid entering the inside into the inside of the connecting piece 2, the top of the connecting piece 2 is flush with the bottom of the two first liquid inlet holes 41, so that the top of the connecting piece 2 is flush with the liquid level in the inside of the liquid phase pipe cap 4 to avoid the liquid in the inside of the liquid phase pipe cap 4 continuously entering the connecting piece 2;

[0038] As shown in Figures 2-3 The end of the connecting piece 2 located in the ring cavity 1b is provided with a second threaded hole 21 for mounting the liquid phase pipe 3, the top of the inner wall of the second threaded hole 21 is provided with a third sealing ring 22 for sealing the liquid phase pipe 3, the connecting piece 2 is used to guide the liquid entering the inside of the liquid phase pipe cap 4 into the inside of the liquid phase pipe 3, the outer surface of the connecting piece 2 is fixedly connected with a third limiting ring 23, the third limiting ring 23 and the bottom of the second sealing ring 15 are mutually overlapped, so as to limit the second sealing ring 15 to increase its firmness, the outer diameter of the end of the connecting piece 2 located in the inner tank body 1 is slightly smaller than the inner diameter of the smaller size of the first limiting ring 12;

[0039] As shown in Figures 1-4As shown, one part of the liquid phase pipe 3 is located inside the ring cavity 1b, and the other part of the liquid phase pipe 3 is connected to the outside of the outer tank body 1a through the differential pressure liquid level meter. The liquid inlet end of the liquid phase pipe 3 is screwed to the inside of the second threaded hole 21 through the outer threaded sleeve 31, that is, the liquid inlet end of the liquid phase pipe 3 is the high-pressure end, so that the fluid inside the inner tank body 1 can enter the liquid phase pipe 3;

[0040] The liquid inlet end of the liquid phase pipe 3 and one end of the outer threaded sleeve 31 are both overlapped with the bottom of the third sealing ring 22. The middle part of the liquid phase pipe 3 is coiled into a single-spring shape to buffer the liquid entering its inside, so as to avoid the problem that the fluid entering the differential pressure liquid level meter is too fast, resulting in unstable reading of the differential pressure liquid level meter.

[0041] As shown in Figure 1 and 4 The main body of the heat conduction mechanism 5 is fixedly connected to the bottom of the inner wall of the inner tank body 1. Part of the heat conduction wire of the heat conduction mechanism 5 is coiled in a spring shape on the outer surface of the liquid phase pipe 3. The heat conduction wire of the heat conduction mechanism 5 is located between the liquid inlet end and the single-spring-shaped middle part of the liquid phase pipe 3. The heat conduction mechanism 5 heats and vaporizes part of the liquid entering the inside of the liquid phase pipe 3 to form a liquid seal inside. The pressure inside the high-pressure gas cavity increases and decreases with the liquid level of the inner tank body 1, so as to press and adjust the position of the liquid seal inside the liquid phase pipe 3 to facilitate the reading of the differential pressure liquid level meter.

[0042] Referring to Figures 1-2 The liquid phase pipe 3 includes a vertical segment 301 combined with the connecting piece 2, a horizontal segment 302 connected to the lower end of the vertical segment 301, a spiral segment 303 bent from the other end of the horizontal segment 302, and a connecting segment 304 connected to the other end of the spiral segment 303. The spiral segment 303 is in a spiral upward shape. The heat conduction wire in a spiral shape surrounds the horizontal segment 302. The liquid inside the inner tank body 1 enters the horizontal segment 302 through the vertical segment 301 and is heated by the heat conduction wire, so that the liquid absorbs heat to become gas, which is buffered through the spiral segment 303 and enters the differential pressure liquid level meter. After the differential pressure liquid level meter accurately reads, the heat conduction wire stops heating. Due to the existence of the spiral segment 303, the liquid entering the liquid phase pipe 3 is maintained on the horizontal segment 302 to form a liquid seal. The horizontal segment 302 can accommodate enough liquid to prevent the end of the liquid phase pipe 3 extending into the inner tank body 1 from communicating with the outside.

[0043] In the specific embodiment, the first sealing ring 13 is installed by arranging the first limiting ring 12 on the upper surface of the inner tank body 1, and the second sealing ring 15 is installed by arranging the second limiting ring 14 on the top of the inner wall of the inner tank body 1, thereby installing the connecting piece 2 screwed into the first threaded hole 11, arranging the second threaded hole 21 on the bottom of the connecting piece 2 to install the liquid-phase pipe 3, and arranging the third sealing ring 22 on the top of the inner wall to increase the sealing effect of the connecting part between the liquid-phase pipe 3 and the connecting piece 2, so that the user can conveniently disassemble and maintain the connecting piece 2 and the liquid-phase pipe 3.

[0044] As shown in Figures 5-6 the second embodiment of the present application is different from the first embodiment in that the fourth limiting ring 16 for limiting the connecting piece 2 is arranged on the bottom of the inner wall of the inner tank body 1, the cross section of the fourth limiting ring 16 is also L-shaped, the larger inner diameter of the fourth limiting ring 16 is the same size as the inner diameter of the first threaded hole 11 and is in communication with each other, the inner wall of the larger inner diameter of the fourth limiting ring 16 and the inner wall of the first threaded hole 11 are both fixedly connected with ten first limiting blocks 17, it is conceivable that the number of the first limiting blocks 17 can be any integer greater than one, the ten first limiting blocks 17 in the fourth limiting ring 16 and the ten first limiting blocks 17 on the inner wall of the first threaded hole 11 are circumferentially distributed, and the ten first limiting blocks 17 in the fourth limiting ring 16 correspond to the positions of the ten first limiting blocks 17 on the inner wall of the first threaded hole 11, respectively, and the inner thread sleeve 18 for installing the first fixing piece 19 is arranged on the bottom of the outer wall of the inner tank body 1;

[0045] The pipe diameters of the two ends of the connecting piece 2 are the same, the outer surface of one end of the connecting piece 2 located in the inner tank body 1 is fixedly connected with the second limiting block 24, the number of the second limiting block 24 is also ten, one end of the connecting piece 2 located in the inner tank body 1 is inserted from the inner thread sleeve 18 and exposed from the smaller inner diameter of the fourth limiting ring 16, the second limiting block 24 on the outer surface of the connecting piece 2 passes through the ten first limiting blocks 17 between the fourth limiting ring 16 and the inner wall of the first threaded hole 11 to the top of the fourth limiting ring 16, and the connecting piece 2 is rotated to make the second limiting block 24 correspond to the positions of the first limiting blocks 17 in the fourth limiting ring 16 and abut with each other, thereby limiting the connecting piece 2;

[0046] The first fixing part 19 is threadedly connected to the inner threaded sleeve 18, and the fourth sealing ring 110 is slidingly connected to the inner threaded sleeve 18. One end of the fourth sealing ring 110 is in mutual overlap with the first fixing part 19, and the other end of the fourth sealing ring 110 is fixedly connected to the limiting strip 118. The number of the limiting strips 118 is ten. The ten limiting strips 118 are inserted into the intervals of the first limiting block 17 and the ten second limiting blocks 24, so as to limit the connecting piece 2 fixedly connected with the second limiting block 24. The liquid inlet end of the liquid phase pipe 3 is inserted into the interiors of the first fixing part 19 and the connecting piece 2. The bottom of the inner wall of the first fixing part 19 is provided with the first connecting groove 111 in a bowl shape. The outer surface of the liquid inlet end of the liquid phase pipe 3 is fixedly connected with the sealing block 32 which is the same in shape as the first connecting groove 111 and is slidingly connected to the interior of the first connecting groove 111.

[0047] Compared with the first embodiment, the first fixing part 19 is only needed to be rotated to install the connecting piece 2 and the liquid phase pipe 3, so that the inconvenience of rotating the liquid phase pipe 3 during installation is avoided, and the purpose of more convenient installation is achieved.

[0048] The size of the liquid inlet hole affects the speed of the liquid in the inner tank 1 entering the liquid phase pipe 3. When the liquid inlet hole is too large, the liquid will become gas through the liquid phase pipe 3 and the heat conducting wire in a short time to enter the interior of the differential pressure liquid level meter, resulting in unstable reading. When the liquid inlet hole is too small, the liquid will become gas through the liquid phase pipe 3 and the heat conducting wire in a long time to enter the interior of the differential pressure liquid level meter, resulting in slow reading of the differential pressure liquid level meter. Therefore, the size of the liquid inlet hole can be adjusted by the third embodiment.

[0049] As Figures 7-8As shown, the third embodiment of the present application is different from the first and second embodiments in that the inner wall of the inner tank body 1 is fixedly connected with an outer threaded sleeve ring 112 at the bottom, the outer surface of the first limiting ring 12 is sleeved with a sealing washer 113, the liquid phase pipe cap 4 is cylindrical, the liquid phase pipe cap 4 is sleeved on the outer surface of the connecting piece 2 and the bottom thereof is overlapped with the sealing washer 113, the inner part of the outer threaded sleeve ring 112 is inserted with an outer pipe cap 42, the outer pipe cap 42 is sleeved on the outer surface of the liquid phase pipe cap 4, the bottom of the outer surface of the outer pipe cap 42 is fixedly connected with a fixing ring 43 for fixing and limiting it, the outer surface of the outer threaded sleeve ring 112 is threadedly connected with a limiting sleeve 114 for limiting the fixing ring 43 to fix the outer pipe cap, the cross section of the limiting sleeve 114 is L-shaped, the outer surface of the outer pipe cap 42 is provided with two groups of second liquid inlet holes 44, the hole diameters of the two groups of second liquid inlet holes 44 are different, it is conceivable that the number of the second liquid inlet holes 44 can be one group, three groups or even more, the two groups of second liquid inlet holes 44 are circumferentially distributed, the number of the second liquid inlet holes 44 of each group is two, and the two second liquid inlet holes 44 of each group are symmetrically distributed, one group of the second liquid inlet holes 44 corresponds to the position of the first liquid inlet hole 41, so that the user can select a suitable second liquid inlet hole 44 to communicate with the first liquid inlet hole 41 to control the size of the liquid inlet hole according to the needs, and the liquid phase pipe cap 4 inside the outer pipe cap 42 can block the remaining unused second liquid inlet holes 44 through the outer wall thereof;

[0050] The bottom of the outer wall of the inner tank body 1 is fixedly connected with an outer threaded connecting sleeve 115 through a connecting strip, the outer surface of the outer threaded connecting sleeve 115 is threadedly connected with a second fixing piece 116, the cross section of the sealing block 32 of the discharge end of the liquid phase pipe 3 is trapezoidal, the bottom of the inner wall of the second fixing piece 116 is provided with a second connecting groove 117 for installing the sealing block 32, compared with the first and second embodiments, this embodiment not only can facilitate the user to install the connecting piece 2 and the liquid phase pipe 3 through the second fixing piece 116, but also can facilitate the user to rotate and adjust the outer pipe cap 42 to facilitate the user to install the gas phase pressure-taking pipe with different pipe diameters.

Claims

1. A pressure tapping pipe structure, characterized in that, include: Installed within the annular cavity formed by the inner and outer tanks, the pressure tapping pipe structure includes a liquid phase pipe, characterized in that the liquid phase pipe comprises: The vertical section is connected to the inner tank, allowing liquid to enter the inner tank; The horizontal section is connected to the vertical section at one end. Liquid can be heated to gas after entering the horizontal section. The spiral section is connected at one end to the other end of the horizontal section and spirals upwards. The top of the spiral section is higher than the horizontal section. When the liquid is not heated, the liquid remains in the horizontal section, forming a liquid seal. The connecting section has one end connected to the other end of the spiral section, and the other end of the connecting section is used to connect to the differential pressure level gauge. An external threaded collar is installed at the bottom of the inner wall of the inner tank. A sealing gasket is fitted on the outer surface of the first limiting ring. A liquid phase tube cap is attached to the upper surface of the sealing gasket. A first liquid inlet hole for guiding the liquid inside the inner tank into the liquid phase tube cap is opened in the middle of the outer peripheral side wall of the liquid phase tube cap. An outer tube cap is inserted into the inner of the external threaded collar. The outer tube cap is fitted onto the outer surface of the liquid phase tube cap. A fixing ring is fixedly connected to the bottom of the outer surface of the outer tube cap. A limiting sleeve for limiting the fixing ring is threaded to the outer surface of the external threaded collar. The liquid phase tube cap inside is installed at the same time as the outer tube cap. Two sets of second liquid inlets are opened on the outer surface of the outer tube cap. The diameters of the two sets of second liquid inlets are different. One set of second liquid inlets is selected to correspond to the position of the first liquid inlet to adjust the size of the liquid inlet. A heat-conducting mechanism is fitted into the middle of the liquid phase tube. The heat-conducting mechanism is fixedly connected to the bottom of the inner wall of the outer tank. The heat-conducting mechanism heats and vaporizes a portion of the liquid inside the horizontal section of the liquid phase tube into gas, which is then buffered by the spiral section and enters the differential pressure level gauge. Once the differential pressure level gauge has an accurate reading, the heating wire stops heating. Due to the presence of the spiral section, the liquid entering the liquid phase tube remains on the horizontal section, forming a liquid seal.

2. The pressure tapping pipe structure according to claim 1, characterized in that, The inner tank has a threaded hole for installing the connector. The bottom of the inner wall of the inner tank is fixedly connected to a first limiting ring for limiting the connector. The two ends of the connector are located inside the inner tank and the ring cavity, respectively. One end of the connector inside the ring cavity has a second threaded hole for installing the liquid phase tube.

3. The pressure tapping pipe structure according to claim 1, characterized in that, The bottom of the inner wall of the inner tank is fixedly connected to an external threaded connecting sleeve by a connecting strip. The outer surface of the external threaded connecting sleeve is threaded with a second fixing member. The bottom of the inner wall of the second fixing member is provided with a second connecting groove for installing the sealing block, which can also install and fix the liquid phase pipe on which the sealing block is installed.

4. The pressure tapping pipe structure according to claim 2, characterized in that, A fourth limiting ring for limiting the connector is installed at the bottom of the inner wall of the inner tank. Multiple first limiting blocks are fixedly connected to the inner wall of the fourth limiting ring and the inner wall of the first threaded hole. Multiple second limiting blocks, also circumferentially distributed, are fixedly connected to the outer surface of the top of the connector. The number of second limiting blocks is the same as that of the first limiting blocks on the inner wall of the fourth limiting ring, and they are also circumferentially distributed. The bottom of the second limiting block overlaps with the top of the first limiting block on the inner wall of the fourth limiting ring, so that the first limiting block limits the connector on which the second limiting block is installed.

5. The pressure tapping pipe structure according to claim 1, characterized in that, The bottom of the outer wall of the inner tank is equipped with an internally threaded sleeve for installing a first fixing member. The first fixing member is used to limit the fourth sealing ring. A first connecting groove is opened at the bottom of the inner wall of the first fixing member. The fourth sealing ring is slidably connected inside the internally threaded sleeve. The fourth sealing ring is used to limit the top of the internally threaded sleeve. The fourth sealing ring is fixedly connected with a plurality of circumferentially distributed limiting strips. The number of limiting strips is the same as that of the second limiting blocks, and the plurality of limiting strips are located between two adjacent second limiting blocks, thereby restricting the rotation of the connector fixedly connected to the second limiting blocks.

6. The pressure tapping tube structure according to claim 2, characterized in that, A first mounting groove for installing a first sealing ring is formed between the first limiting ring and the bottom wall of the inner tank. A second limiting ring is fixedly connected to the bottom of the outer wall of the inner tank. The second limiting ring and the inner wall of the inner tank form a second mounting groove for installing a second sealing ring. The first sealing ring and the second sealing ring are respectively used to seal the edges at both ends of the first threaded hole.

7. The pressure tapping pipe structure according to claim 6, characterized in that, The connector is threaded into the inside of the first threaded hole. The top of the connector overlaps with the first sealing ring. The first limiting ring can limit the position of the connector. A third limiting ring is fixedly connected to the bottom of the outer surface of the connector. The top of the third limiting ring overlaps with the second sealing ring, and the third limiting ring is located inside the second limiting ring. The third limiting ring is used to limit the position of the second sealing ring. A third sealing ring for sealing the joint of the liquid phase tube is installed on the top of the inner wall of the second threaded hole.

8. The pressure tapping pipe structure according to claim 2, characterized in that, The liquid phase tube is threadedly connected to the inside of the second threaded hole through an external threaded sleeve. The end of the liquid phase tube fixedly connected to the external threaded sleeve and the other end of the external threaded sleeve overlap with the third sealing ring.

9. A pressure tapping tube structure according to claim 8, characterized in that, The liquid phase cap is installed at the bottom of the inner wall of the inner tank. The side wall of the liquid phase cap has a first inlet hole for guiding the liquid inside the inner tank into the liquid phase cap. The liquid inside the inner tank enters the liquid phase cap and the liquid level is flush with the bottom. The part of the liquid phase cap that is above the liquid level forms a high-pressure gas chamber. The connector is flush with the bottom of the first inlet hole. The liquid phase cap guides a portion of the liquid that enters into its interior into the liquid phase tube through the connector.

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