Pipeline adding structure

Abstract

The utility model discloses a pipeline adding structure, and relates to the technical field of air conditioner refrigerant pipelines, the pipeline adding structure comprises a maintenance pipe part and a filling pipe part, a flow guide cavity is formed in the inner side of the maintenance pipe part, and a sealing part in a normally closed state is arranged in the flow guide cavity; a first mounting end and a second mounting end are further formed at the two ends of the overhauling pipe part, the second mounting end is used for being connected with an external pipeline, a liquid injection cavity is formed in the inner side of the filling pipe part, and an abutting part is further arranged in the filling pipe part; according to the technical scheme, a detachable quick-release structure is arranged between the filling pipe part and the overhauling pipe part, the overhauling pipe part can directly replace a traditional valve pin structure after being installed, relevant sealing structures do not need to be detached in the actual refrigerant adding process, actual operation is more convenient and faster, and the service life of the valve pin is prolonged. And the situation that the adaptability between existing mounting structures becomes poor due to frequent disassembly of the sealing structure can be better avoided.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning refrigerant pipeline technology, and in particular to a pipeline addition structure. Background Technology

[0002] Air conditioning refrigerant piping refers to the piping system used to transport and circulate refrigerant in an air conditioning system. Specifically, refrigerant piping is one of the key components of an air conditioning system. It is responsible for transporting compressed refrigerant from the outdoor unit to the indoor unit, or from the compressor to the condenser and indoor unit. Common air conditioning refrigerants include R22 and R410A, which circulate in the piping in liquid or gaseous form.

[0003] Air conditioning refrigerant pipes are generally made of copper or aluminum and require good thermal conductivity to efficiently transfer heat. Air conditioning refrigerant pipes are divided into straight pipes and bends according to their layout. Most of the inspection ports of common air conditioning refrigerant pipes use threaded connections and are sealed internally with valve pins. When the gas pressure is unstable, the valve pins are prone to gas leakage, thereby reducing the cooling efficiency. Therefore, a quick-release structure for air conditioning refrigerant pipes is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The main purpose of this utility model is to propose a pipe addition structure, which aims to solve the problem that most of the inspection ports of common air conditioning refrigerant pipes use threaded connections and internal valve pin seals. When the gas pressure is unstable, the valve pins are prone to gas leakage, thereby reducing the cooling efficiency.

[0005] To achieve the above objectives, the pipe addition structure proposed in this utility model includes:

[0006] The inspection pipe section has an inner guiding cavity, within which a normally closed sealing portion is provided. The inspection pipe section also has a first mounting end and a second mounting end at both ends, the second mounting end being used for connection to an external pipeline; and...

[0007] The filling tube has an inner cavity for filling and a connecting part inside. One end of the filling tube is detachably mounted on the first mounting end so that one end of the connecting part abuts against the sealing part to form a filling passage from the filling cavity and the guiding cavity to the external pipeline.

[0008] In one embodiment, the flow guiding cavity includes an inner flow guiding port disposed along the axial direction of the inspection pipe section;

[0009] The sealing part includes a sealing end, one end of which is movably installed in the flow guiding cavity corresponding to the inner flow guiding port, and the sealing end has a tendency to move toward the inner flow guiding port to form the normally closed state.

[0010] In one embodiment, the flow guiding cavity further includes a first chamber corresponding to the filling tube section, the other end of the first chamber being connected to the inner flow guiding port, the first chamber and the inner flow guiding port being arranged in a stepped hole configuration, and the liquid guiding cross-sectional area of ​​the first chamber being larger than the liquid guiding cross-sectional area of ​​the inner flow guiding port.

[0011] In one embodiment, the sealing portion includes:

[0012] A movable rod is located inside the inner guide port, and a first liquid guiding gap is formed between the peripheral wall of the movable rod and the inner guide port;

[0013] The first elastic element has one end installed at the outer edge of the inner guide port corresponding to the first chamber, and the other end connected to one end of the movable rod;

[0014] A sealing protrusion is installed at the end of the movable rod away from the first chamber, corresponding to the inner guide port;

[0015] The sealing protrusion includes the sealing end.

[0016] In one embodiment, the end of the inner guide port away from the first chamber has an opening that expands outward from the inside, and the sealing protrusion and the opening are correspondingly shaped; and / or,

[0017] The movable rod has a fixed plate at one end corresponding to the injection cavity, and one end of the first elastic member is connected to the fixed plate.

[0018] In one embodiment, the filling tube section has a recessed portion formed by the inward recess of one end opening of the inspection tube section, and a connector is provided between the recessed portion and one end of the inspection tube section. The connector is used to install one end of the inspection tube section into the recessed portion in a recessed manner.

[0019] In one embodiment, the connector includes:

[0020] A plurality of first snap-fit ​​portions are evenly spaced around the axis of the inspection tube and disposed on the outer wall of the end of the inspection tube; and,

[0021] Multiple second snap-fit ​​portions are evenly spaced and installed on the inner wall of the recessed portion, corresponding to multiple first snap-fit ​​portions;

[0022] A retaining area is formed between the plurality of second latching portions and the bottom surface of the recessed portion to limit the plurality of first latching portions.

[0023] In one embodiment, the first snap-fit ​​portion and the second snap-fit ​​portion are respectively configured to form snap-fit ​​units, and the snap-fit ​​units are configured to be at least three sets.

[0024] In one embodiment, the filling tube section is provided with an inner tube section, one end of the inner tube section is located on the outside of the filling tube section, and a second liquid guiding gap is formed between the inner tube section and the inner wall of the filling tube section;

[0025] The inner cavity of the inner tube and the second liquid guiding gap are connected by a connection port;

[0026] The injection chamber includes the inner cavity of the inner tube and the second liquid guiding gap;

[0027] The inner tube includes the abutting part.

[0028] In one embodiment, the second liquid guiding gap is further provided with an abutment structure, the abutment structure comprising:

[0029] A second elastic element is sleeved and installed on the outside of the inner tube section, with its end away from the inspection tube section located on the inner wall of the filling tube section; and...

[0030] A circular ring is fitted onto the outside of the inner tube. The outer ring of the circular ring is slidably mounted on the inner wall of the filling tube along the axial direction of the filling tube. A third fluid guiding gap is formed between the inner ring of the circular ring and the outer wall of the inner tube. The other end of the second elastic member is connected to the circular ring so that the circular ring abuts against one end of the inspection tube.

[0031] In the technical solution of this utility model, the filling pipe section and the inspection pipe section are detachable quick-release structures. In actual use, after the inspection pipe section is installed, it can directly replace the traditional valve pin structure. In the actual refrigerant adding process, there is no need to disassemble the relevant sealing structure, which is more convenient in actual operation and can better avoid the situation where the compatibility between existing installation structures deteriorates due to frequent disassembly of the sealing structure. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the overall structure of an embodiment of the pipe addition structure provided by this utility model;

[0034] Figure 2 for Figure 1 Schematic diagram of the internal structure of the filling pipe section;

[0035] Figure 3 for Figure 1 Schematic diagram of the internal structure of the Central Maintenance Pipeline Department;

[0036] Figure 4 for Figure 1 A schematic diagram of the internal cross-sectional structure of the added structure in the pipeline.

[0037] Explanation of icon numbers:

[0038] 100. Pipeline addition structure; 1. Inspection pipe section; 11. Flow guide cavity; 111. Inner flow guide port; 1111. Opening section; 112. First liquid guide gap; 113. First chamber; 2. Filling pipe section; 21. Recessed section; 22. Inner pipe section; 23. Second liquid guide gap; 24. Injection chamber; 3. Sealing section; 31. Movable rod; 32. First elastic element; 33. Sealing protrusion; 34. Fixing plate section; 4. Connecting part; 41. First snap-fit ​​part; 42. Second snap-fit ​​part; 5. Abutment structure; 51. Second elastic element; 52. Circular part; 53. Third liquid guide gap; 6. Holding area; 7. Connection port.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0041] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0043] Air conditioning refrigerant piping refers to the piping system used to transport and circulate refrigerant in an air conditioning system. Specifically, refrigerant piping is one of the key components of an air conditioning system. It is responsible for transporting compressed refrigerant from the outdoor unit to the indoor unit, or from the compressor to the condenser and indoor unit. Common air conditioning refrigerants include R22 and R410A, which circulate in the piping in liquid or gaseous form.

[0044] Air conditioning refrigerant pipes are generally made of copper or aluminum and require good thermal conductivity to efficiently transfer heat. Air conditioning refrigerant pipes are divided into straight pipes and bends according to their layout. Most of the inspection ports of common air conditioning refrigerant pipes use threaded connections and are sealed internally with valve pins. When the gas pressure is unstable, the valve pins are prone to gas leakage, thereby reducing the cooling efficiency. Therefore, a quick-release structure for air conditioning refrigerant pipes is proposed to solve the above-mentioned problems.

[0045] This utility model proposes a pipe addition structure 100 to solve the above problems.

[0046] Please see Figure 1 and Figure 4 In one embodiment of the present invention, the pipeline addition structure 100 includes an inspection pipe section 1 and a filling pipe section 2. The inspection pipe section 1 has a flow guiding cavity 11 formed on its inner side. The flow guiding cavity 11 is provided with a sealing part 3 in a normally closed state. The two ends of the inspection pipe section 1 also form a first mounting end and a second mounting end. The second mounting end is used to connect with an external pipeline. The filling pipe section 2 has an injection cavity 24 formed on its inner side. The filling pipe section 2 is also provided with an abutment part. One end of the filling pipe section 2 is detachably installed on the first mounting end so that one end of the abutment part abuts against the sealing part 3 to form an injection passage from the injection cavity 24 and the flow guiding cavity 11 to the external pipeline.

[0047] In the above embodiments, the pipeline adding structure 100 actually includes the detachably connected inspection pipe section 1 and the filling pipe section 2. In practical use, the second mounting end of the inspection pipe section 1 needs to be connected to the external pipeline where the liquid reagent needs to be added. Taking an air conditioning refrigeration pipeline as an example, the second mounting end can be directly installed at the inspection port of the air conditioning refrigeration pipeline. When the air conditioning refrigeration pipeline is working normally, the filling pipe section 2 is not connected to the inspection pipe section 1. At this time, the sealing part 3 in the inspection pipe is in a normally closed state, allowing the air conditioning refrigeration pipeline inspection port to maintain a tight seal, and the air conditioning refrigeration pipeline is in a normal internal circulation working state. When refrigerant needs to be added, one end of the filling pipe section 2 can be installed on the first mounting end. It should be noted that the filling pipe section 2 and the inspection pipe section 1 are preferably circular pipe fittings. When their two ends are actually connected, a coaxial installation effect is achieved. During the installation of the charging pipe section 2 toward the maintenance pipe section 1, one end of the abutting part will abut against one end of the sealing part 3. After the charging pipe section 2 and the maintenance pipe section 1 are fully connected, the abutting part will push open the sealing part 3, at which point the sealing part 3 changes from a normally closed state to a normally open state. In this state, a liquid injection passage is formed from the liquid injection chamber 24 and the flow guiding chamber 11 to the external pipeline. Refrigerant can be injected into the liquid injection chamber 24 through the charging pipe section 2, and the refrigerant will flow along the liquid injection passage to the air conditioner's refrigeration pipeline.

[0048] After the refrigerant has been added, the charging pipe 2 can be removed from the inspection pipe 1. At this time, the contact part and the sealing part 3 will slowly separate from each other. The sealing part 3 will then undergo a reset movement, thereby returning to its normally closed state, and the inspection port of the air conditioning refrigeration pipe will also be in a good sealing state.

[0049] It is conceivable that, in the present application, the maintenance pipeline can directly replace the traditional valve pin structure after installation. In the actual refrigerant addition process, there is no need to disassemble the relevant sealing structure, which is more convenient in actual operation and can better avoid the situation where frequent disassembly of the sealing structure leads to a decrease in the compatibility between the existing installation structures.

[0050] In addition, it should be noted that the pipe addition structure 100 proposed in the above embodiments is not only applicable to the refrigeration pipes of air conditioners. In conventional usage scenarios where the addition port needs to be sealed and reagents need to be added periodically, the maintenance pipe section 1 and the filling pipe section 2 in the above embodiments can also achieve good results.

[0051] The flow guiding cavity 11 includes an inner flow guiding port 111 disposed along the axial direction of the inspection pipe section 1. The sealing part 3 includes a sealing end, one end of which is movably installed within the flow guiding cavity 11 corresponding to the inner flow guiding port 111, and the sealing end has a tendency to move towards the inner flow guiding port 111 to form the normally closed state. Figure 3 As shown, the inner guide port 111 is located on the central axis of the inspection pipe section 1. The sealing end of the sealing part 3 is provided corresponding to one end of the inner guide port 111 and has a tendency to move towards the inner guide port 111. Under natural conditions without external force, the sealing end can fit with one end of the inner guide port 111, thereby keeping the inner guide port 111 in a normally closed state.

[0052] In practice, the flow guiding cavity 11 also includes a first chamber 113 corresponding to the filling pipe section 2. The other end of the first chamber 113 is connected to the inner flow guiding port 111. The first chamber 113 and the inner flow guiding port 111 are arranged in a stepped hole configuration, and the cross-sectional area of ​​the liquid guiding in the first chamber 113 is larger than that of the inner flow guiding port 111. In actual configuration, the flow guiding cavity 11 is a single chamber formed by the first chamber 113 and the inner flow guiding port 111. The opening at one end of the inspection pipe section 1 corresponding to the filling pipe section 2 forms the opening at one end of the first chamber 113. This opening is the butt joint end, and its cross-sectional area is relatively large. The inner flow guiding port 111 is located at the bottom center of the first chamber 113, that is, coaxially arranged with the first chamber 113. The cross-sectional area of ​​the inner flow guiding port 111 is relatively small. With this configuration, the actual specifications of the corresponding sealing end can also be set relatively small, and the stability during sealing can be further improved.

[0053] In one embodiment of this utility model, the sealing part 3 is a normally closed structure capable of self-sealing, requiring no external driving structure, and is structurally simpler and more reliable. Specifically, the sealing part 3 includes a movable rod 31, a first elastic element 32, and a sealing protrusion 33. The movable rod 31 is disposed inside the inner guide port 111, and a first liquid guiding gap 112 is formed between the peripheral wall of the movable rod 31 and the inner guide port 111. One end of the first elastic element 32 is installed on the outer edge of the inner guide port 111 corresponding to the first chamber 113, and the other end is connected to one end of the movable rod 31. The sealing protrusion 33 is installed on the end of the movable rod 31 away from the first chamber 113, corresponding to the inner guide port 111, wherein the sealing protrusion 33 includes the sealing end.

[0054] like Figure 3 and Figure 4As shown in the above embodiment, when refrigerant needs to be added to the air conditioning refrigeration pipe, the abutting part will abut against the end of the movable rod 31 corresponding to the first chamber 113. After full installation and abutment, the abutting part will drive the movable rod 31 to move along the axial direction of the inspection pipe section 1 in the middle of the inner guide port 111, thereby causing the sealing protrusion 33 and the side wall of the inner guide port 111 away from the first chamber 113 to separate. At this time, the first chamber 113 and the inner guide port 111 are both in a conductive state, and the refrigerant in the injection chamber 24 can flow from the first chamber 113 into the first liquid guide gap 112, thereby flowing from one end of the first liquid guide gap 112 into the air conditioning refrigeration pipe. It should be noted that the movable rod 31 has a good centering installation effect in the inner guide port 111, which is mainly achieved by the first elastic member 32 to achieve a floating installation effect in the inner guide port 111. Specifically, a fixing plate 34 is provided at one end of the movable rod 31 corresponding to the injection chamber 24. One end of the first elastic member 32 is connected to the fixing plate 34, thereby allowing the fixing plate 34 to fix one end of the movable rod 31. Alternatively, the movable rod 31 can be directly attached to a portion of the inner wall of the inner guide port 111. This contact-type installation also creates the first liquid guiding gap 112 between the movable rod 31 and the inner guide port 111, enabling the sealing and opening of the inner guide port 111. This can be configured according to actual conditions.

[0055] To ensure a proper seal between the sealing protrusion 33 and the end of the inner guide port 111, this embodiment optimizes the design of the end opening of the inner guide port 111 furthest from the first chamber 113. Specifically, as shown in... Figure 3 As shown, the inner guide port 111 has an opening 1111 that expands outward from the inside at one end away from the first chamber 113. The sealing protrusion 33 is correspondingly shaped to the opening 1111. By setting one end of the inner guide port 111 to the aforementioned expanding arc surface structure, the contact area between the sealing protrusion 33 and the end of the inner guide port 111 can be increased as much as possible, thereby achieving a recessed installation of the sealing protrusion 33. This ensures the accuracy of the engagement position between the sealing protrusion 33 and the inner guide port 111, and further improves the sealing effect of the sealing protrusion 33.

[0056] The external leakage design enables quick-release between the inspection section and the filling tube section 1. A corresponding connector 4 is provided between the filling tube section 2 and the inspection tube section 1. The filling tube section 2 has a recessed portion 21 formed by the opening at one end corresponding to the inspection tube section 1. The connector 4 is provided between the recessed portion 21 and one end of the inspection tube section 1, and is used to install one end of the inspection tube section 1 in a recessed manner inside the recessed portion 21. When the inspection tube section 1 and the filling tube section 2 are actually connected, one end of the inspection tube section 1 is located in the recessed portion 21 at the end of the filling tube section 2, and a tight connection is achieved through the connector 4. The recessed installation method is also to maximize the contact area between the ends of the two tubes, thereby improving the sealing effect after the two tube ends are connected.

[0057] Specifically, the connector 4 includes a plurality of first locking portions 41 and a plurality of second locking portions 42. The plurality of first locking portions 41 are evenly spaced around the axis of the inspection tube on the outer wall of the end of the inspection tube. The plurality of second locking portions 42 are evenly spaced and installed on the inner wall of the recess 21 corresponding to the plurality of first locking portions 41. A retaining area 6 is formed between the plurality of second locking portions 42 and the bottom surface of the recess 21 to limit the movement of the plurality of first locking portions 41. Figure 2 and Figure 4 As shown, during actual installation, the multiple first snap-fit ​​parts 41 and multiple second snap-fit ​​parts 42 are first staggered so that one end of the filling tube 2 can be sleeved on the outside of one end of the inspection tube 1. Then, the filling tube 2 can be rotated so that the multiple second snap-fit ​​parts 42 move to the side position of the multiple first snap-fit ​​parts 41 respectively. At this time, the multiple second snap-fit ​​parts 42 limit the filling tube 2 on the same axis of the inspection tube 1 and the filling tube 2.

[0058] like Figure 1 As shown, to facilitate control of the rotation angle of the filling tube section 2, a limiting structure can be provided on one side of the first locking part 41. After the filling tube section 2 rotates a certain angle, the limiting structure can abut against the side wall of the second locking part 42, thereby restricting the filling tube section 2 from continuing to move on one end of the maintenance tube section 1, thus greatly improving the ease of operation during the actual connection process. In the actual setup, the holding part and the second locking part 42 correspond to form a locking unit, and the locking unit is set to at least three sets, thereby maximizing the connection effect between the maintenance tube section 1 and the filling tube section 2.

[0059] The filling tube section 2 is configured with a double-layer structure. Specifically, the filling tube section 2 has an inner tube section 22 inside. One end of the inner tube section 22 is located on the outside of the filling tube section 2. A second liquid guiding gap 23 is formed between the inner tube section 22 and the inner wall of the filling tube section 2. The inner cavity of the inner tube section 22 and the second liquid guiding gap 23 are connected through a connecting port 7. The filling chamber 24 includes the inner cavity of the inner tube section 22 and the second liquid guiding gap 23. The inner tube section 22 includes the abutment portion. When actually adding refrigerant, the corresponding charging device is connected to one end of the inner tube section 22. After the inspection tube section 1 and the charging tube section 2 are connected together, one end of the inner tube section 22 abuts against the fixed plate section 34. Therefore, the refrigerant in the inner tube section 22 flows from the connection port 7 into the second liquid guiding gap 23, and then flows into the guiding cavity 11. At the same time, the inner tube section 22 continuously applies force to the sealing protrusion 33, thereby causing the inner guiding port 111 to switch to the open state.

[0060] When the inspection tube 1 is installed inside one end of the filling tube 2, in order to further enhance the sealing of the connection between the two, an abutment structure 5 is also provided in the second fluid guiding gap 23. The abutment structure 5 includes a second elastic member 51 and an annular part. The second elastic member 51 is sleeved and installed on the outside of the inner tube 22, and its end away from the inspection tube 1 is located on the inner wall of the filling tube 2. The annular part 52 is sleeved on the outside of the inner tube 22. The outer ring of the annular part 52 is slidably installed on the inner wall of the filling tube 2 along the axial direction of the filling tube 2, and a third fluid guiding gap 53 is formed between the inner ring of the annular part 52 and the outer wall of the inner tube 22. The other end of the second elastic member 51 is connected to the annular part 52 so that the annular part 52 abuts against one end of the inspection tube 1.

[0061] After the inspection tube section 1 and the filling tube section 2 are connected, multiple first snap-fit ​​parts 41 are located in the snap-fit ​​area 6. At this time, one end of the inspection tube section 1 and the annular part 52 are in contact. Since the outer ring of the annular part 52 is slidably sealed to the inner wall of the filling tube section 2, the second elastic element 51 is in a compressed state. The refrigerant in the second liquid guiding gap 23 can only flow into the first chamber 113 from the third liquid guiding gap 53. Therefore, after the inspection tube section 1 and the filling tube section 2 are connected, a good sealing state can be maintained between the entire flow guiding cavity 11 and the liquid injection cavity 24, and no refrigerant leakage will occur during the refrigerant filling process.

[0062] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pipe addition structure, characterized in that, include: The inspection pipe section has an inner guiding cavity, within which a normally closed sealing portion is provided. The inspection pipe section also has a first mounting end and a second mounting end at both ends, the second mounting end being used for connection to an external pipeline; and... The filling tube has an inner cavity for filling and a connecting part inside. One end of the filling tube is detachably mounted on the first mounting end so that one end of the connecting part abuts against the sealing part to form a filling passage from the filling cavity and the guiding cavity to the external pipeline.

2. The pipe addition structure as described in claim 1, characterized in that, The flow guide cavity includes an inner flow guide port arranged along the axial direction of the maintenance pipe section; The sealing part includes a sealing end, one end of which is movably installed in the flow guiding cavity corresponding to the inner flow guiding port, and the sealing end has a tendency to move toward the inner flow guiding port to form the normally closed state.

3. The pipe addition structure as described in claim 2, characterized in that, The flow guiding cavity also includes a first chamber corresponding to the filling tube section. The other end of the first chamber is connected to the inner flow guiding port. The first chamber and the inner flow guiding port are arranged in a stepped hole configuration, and the cross-sectional area of ​​the first chamber is larger than the cross-sectional area of ​​the inner flow guiding port.

4. The pipe addition structure as described in claim 3, characterized in that, The sealing part includes: A movable rod is located inside the inner guide port, and a first liquid guiding gap is formed between the peripheral wall of the movable rod and the inner guide port; The first elastic element has one end installed at the outer edge of the inner guide port corresponding to the first chamber, and the other end connected to one end of the movable rod; A sealing protrusion is installed at the end of the movable rod away from the first chamber, corresponding to the inner guide port; The sealing protrusion includes the sealing end.

5. The pipe addition structure as described in claim 4, characterized in that, The inner guide port has an opening that expands outward from the inside at the end away from the first chamber; the sealing protrusion and the opening are correspondingly shaped; and / or... The movable rod has a fixed plate at one end corresponding to the injection cavity, and one end of the first elastic member is connected to the fixed plate.

6. The pipe addition structure as described in claim 1, characterized in that, The filling tube section has a recessed portion formed by the opening at one end of the inspection tube section. A connector is provided between the recessed portion and one end of the inspection tube section. The connector is used to install one end of the inspection tube section into the recessed portion in a recessed manner.

7. The pipe addition structure as described in claim 6, characterized in that, The connector includes: A plurality of first snap-fit ​​portions are evenly spaced around the axis of the inspection tube and disposed on the outer wall of the end of the inspection tube; and, Multiple second snap-fit ​​portions are evenly spaced and installed on the inner wall of the recessed portion, corresponding to multiple first snap-fit ​​portions; A retaining area is formed between the plurality of second latching portions and the bottom surface of the recessed portion to limit the plurality of first latching portions.

8. The pipe addition structure as described in claim 7, characterized in that, The first snap-fit ​​portion and the second snap-fit ​​portion form snap-fit ​​units, and the snap-fit ​​units are configured in at least three groups.

9. The pipe addition structure as described in claim 1, characterized in that, The filling tube section is provided with an inner tube section, one end of which is located on the outside of the filling tube section, and a second liquid guiding gap is formed between the inner tube section and the inner wall of the filling tube section; The inner cavity of the inner tube and the second liquid guiding gap are connected by a connection port; The injection chamber includes the inner cavity of the inner tube and the second liquid guiding gap; The inner tube includes the abutting part.

10. The pipe addition structure as described in claim 9, characterized in that, The second liquid guiding gap is further provided with an abutment structure, the abutment structure including: A second elastic element is sleeved and installed on the outside of the inner tube section, with its end away from the inspection tube section located on the inner wall of the filling tube section; and... A circular ring is fitted onto the outside of the inner tube. The outer ring of the circular ring is slidably mounted on the inner wall of the filling tube along the axial direction of the filling tube. A third fluid guiding gap is formed between the inner ring of the circular ring and the outer wall of the inner tube. The other end of the second elastic member is connected to the circular ring so that the circular ring abuts against one end of the inspection tube.

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