Expander and high-pressure oil tank

Abstract

The utility model relates to an expander and a high-pressure oil tank, the expander comprises a flexible main body and a sealing assembly, an empty bin is formed in the flexible main body, and a first communicating port communicating with the empty bin is formed in the flexible connecting end of the flexible main body; the sealing assembly is connected with the flexible body and is in extrusion sealing with the end face of the flexible connecting end of the flexible body, the sealing assembly comprises a communicating pipe communicating with the first communicating opening, the communicating pipe is sleeved with a sealing piece, the sealing piece is used for being matched with a connecting opening of an installation part in an embedded mode, and the communicating pipe penetrates through the connecting opening; the problems that an existing high-pressure oil tank is low in sealing reliability and prone to oil leakage are solved.

Description

Technical Field

[0001] The present application relates to the technical field of expanders, and in particular to an expander and a high-pressure oil tank. Background Art

[0002] The tube, detector, and high-voltage generator are collectively known as the three core components of X-ray equipment. The CT high-voltage generator is the most crucial component of the high-voltage system in medical CT equipment, providing power and an interface for the tube, ensuring the quality and stability of X-rays during CT scans. The CT high-voltage generator consists of two parts: the CT control cabinet and the CT high-voltage oil tank. The CT high-voltage oil tank expander is a crucial component, ensuring its stability during operation. During operation, the internal temperature of the CT high-voltage oil tank rises, causing the transformer oil used for heat dissipation to expand. Since the CT high-voltage oil tank is filled with transformer oil, this expansion of the transformer oil must be offset by the expansion and contraction of the CT high-voltage oil tank to prevent leakage due to the temperature rise.

[0003] For example, patent publication number CN114724814A discloses a device and method for solving the problem of insulating oil expansion and air removal in a high-voltage device. The expander is provided with a flange at the end, and a sealing groove is provided on the outer side of the flange for sealingly connecting with the high-voltage device oil tank. A sealing member that mates with the flange is provided on the high-voltage device oil tank, thereby connecting the expander to the high-voltage device oil tank and achieving a sealing effect. However, the sealing member that mates with the flange occupies a large area in the high-voltage device oil tank, has low sealing reliability, and is prone to oil leakage. Utility Model Content

[0004] The present application provides an expander and a high-pressure oil tank to solve the problem that the existing high-pressure oil tank has low sealing reliability and is prone to oil leakage.

[0005] In a first aspect, the present application provides an expander, comprising:

[0006] A flexible body, wherein an empty chamber is formed inside the body, and a first communication port communicating with the empty chamber is formed at a flexible connection end of the flexible body; and

[0007] A sealing assembly is connected to the flexible body and is squeezed and sealed with the end face of the flexible connection end of the flexible body. The sealing assembly includes a connecting pipe connected to the first connecting port. A sealing member is provided on the outer sleeve of the connecting pipe. The sealing member is used to be embedded and matched with the connecting port of the installation component, and the connecting pipe is set to pass through the connecting port.

[0008] In one possible implementation, the sealing assembly includes a seat body and a pressure plate, the seat body is arranged on the flexible main body, a second connecting port is opened through the seat body at a position corresponding to the first connecting port, the pressure plate is connected to the seat body to squeeze the end face of the flexible connection end, and the connecting tube is arranged on the pressure plate and passes through the pressure plate.

[0009] In a possible implementation, the connecting pipe and the pressing plate are integrally formed.

[0010] In one possible implementation, the flexible connection end includes a connecting column and a connecting boss connected to each other, the two ends of the connecting column are respectively connected to the flexible body and the connecting boss, the connecting column is arranged in the second connecting port, the connecting boss protrudes from the seat body for cooperating with the pressure plate, and the cross-sectional size of the connecting boss is larger than the cross-sectional size of the second connecting port.

[0011] In one possible implementation, a positioning assembly is provided between the base body and the flexible connection end, and the positioning assembly includes a first positioning member and a second positioning member that are embedded and matched, one of the first positioning member and the second positioning member is provided on the flexible connection end, and the other is provided on the base body.

[0012] In a possible implementation, the seat body and the pressing plate are detachably connected via a connecting piece.

[0013] In a possible implementation, a mounting seat is provided on the outer sleeve of the connecting pipe, a mounting groove is provided on a side of the mounting seat away from the flexible body, and the sealing member is embedded in the mounting groove and protrudes from the mounting groove.

[0014] In a possible implementation, a connecting assembly is further included, and the connecting assembly is used to connect the upper cover and the connecting pipe.

[0015] In a possible implementation, the connection assembly includes a gasket and a screw connection member sequentially sleeved on the connecting pipe, the screw connection member is threadedly engaged with the connecting pipe, and the gasket is limited to a side of the upper cover away from the box body.

[0016] In the second aspect, the present application provides a high-pressure oil tank, comprising a tank body and an expander as described in the first aspect, wherein the tank body is provided with an upper cover, and a connection port is opened through the upper cover, the expander is arranged in the tank body, the connecting pipe of the expander is plugged into the connection port, and the outer peripheral side of the seal of the expander is sealed with the connection port.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The expander and high-pressure oil tank provided in this embodiment, the sealing component of the expander ensures the sealing effect of the end face of the flexible connecting end of the flexible body by squeezing and sealing the end face of the flexible connecting end, the connecting pipe is connected to the empty chamber of the flexible body through the first connecting port, and when installing the expander, it is only necessary to plug the connecting pipe into the connecting port of the installation component, which is convenient for operation, and the gap between the connecting pipe and the connecting port is sealed by the sealing component to ensure the sealing effect. The expander provided in this application has a simple structure and is easy to operate. In addition, after the expander is connected to the installation component, the area occupied by the connection position between the expander and the installation component is only the diameter of the connecting pipe, the area occupied on the installation component is small, the sealing reliability is high, and oil leakage and the like are avoided. Of course, the diameter of the connecting pipe can also be adaptively selected according to the application requirements of the installation component in different scenarios and the layout requirements of other components on the installation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 A three-dimensional diagram of an expander provided in an embodiment of the present application.

[0023] Figure 2 This is an exploded diagram of an expander provided in an embodiment of the present application.

[0024] Figure 3 A three-dimensional diagram of a flexible body in an expander provided in an embodiment of the present application.

[0025] Figure 4 A three-dimensional diagram of a seat body in an expander provided in an embodiment of the present application.

[0026] Figure 5 A cross-sectional view of the cooperation between a flexible body and a seat body in an expander provided in an embodiment of the present application.

[0027] Figure 6A schematic structural diagram of a high-pressure oil tank provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Flexible body; 2. First connecting port; 3. Connecting pipe; 4. Sealing member; 5. Base; 6. Pressure plate; 7. Second connecting port; 8. Connecting column; 9. Connecting boss; 10. First positioning member; 11. Second positioning member; 12. Connecting member; 13. Mounting seat; 14. Mounting groove; 15. Pad; 151. Flat washer; 152. Spring washer; 16. Screw-on member; 17. Upper cover. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0032] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0033] Reference Figures 1-6 An embodiment of the present application provides an expander, comprising a flexible body 1 and a sealing assembly. A hollow chamber is formed within the flexible body 1, and a first communication port 2 communicating with the hollow chamber is defined at a flexible connection end of the flexible body 1. The sealing assembly is connected to the flexible body 1 and forms an extrusion seal with the end surface of the flexible connection end of the flexible body 1. The sealing assembly includes a communication tube 3 communicating with the first communication port 2. A sealing member 4 is disposed on the outer surface of the communication tube 3, and the sealing member 4 is configured to be embedded and engaged with a connection port of a mounting component. The communication tube 3 is disposed through the connection port.

[0034] The sealing component ensures the sealing effect of the end face of the flexible connecting end of the flexible body 1 by squeezing and sealing. The connecting pipe 3 is connected to the empty compartment of the flexible body 1 through the first connecting port 2. When installing the expander, it is only necessary to plug the connecting pipe 3 into the connecting port of the installation component, which is convenient for operation. The gap between the connecting pipe 3 and the connecting port is sealed by the sealing member 4 to ensure the sealing effect. The expander provided in this application has a simple structure and is easy to operate. In addition, after the expander is connected to the installation component, the area occupied by the connection position between the expander and the installation component is only the diameter of the connecting pipe 3. The area occupied on the installation component is small, the sealing reliability is high, and oil leakage and the like are avoided. Of course, the diameter of the connecting pipe 3 can also be adaptively selected according to the application requirements of the installation component in different scenarios and the layout requirements of other components on the installation component.

[0035] In order to ensure the normal operation of the expander, the expander usually needs to have high elastic limit, tensile strength and fatigue strength. The material of the flexible body 1 in this application includes austenitic stainless steel or high nickel alloy and iron-nickel alloy.

[0036] In addition, the sealing member 4 is sleeved on the connecting pipe 3 , and the sealing member 4 can be a component such as an O-ring or a rubber gasket that can achieve a sealing effect.

[0037] Of course, the installation component can be a high-pressure oil tank, or a water supply system. The expander is installed in the water supply system to absorb excess pressure generated when water is heated and expanded, so as to maintain the balance and efficiency of the water supply system. The installation component can also be a thermal system, such as an air conditioner, a boiler, a heat pump, etc. The expander can be installed at the return water end of the system to buffer and absorb the volume increase of the working medium due to temperature changes, and play a stabilizing role in buffering pressure fluctuations.

[0038] Reference Figures 1 to 4The sealing assembly includes a seat body 5 and a pressure plate 6. The seat body 5 is arranged on the flexible main body 1. A second communication port 7 is penetrated and opened at the position where the seat body 5 is opposite to the first communication port 2. The pressure plate 6 is connected to the seat body 5 to squeeze the end face of the flexible connection end. The communicating tube 3 is arranged on the pressure plate 6 and penetrates the pressure plate 6. The flexible connection end of the flexible main body 1 protrudes from the seat body 5 through the second communication port 7. The pressure plate 6 is pressed on the seat body 5 to squeeze the flexible connection end protruding from the seat body 5. After the pressure plate 6 is connected to the seat body 5, the reliability of the extrusion is guaranteed, thereby ensuring the sealing effect.

[0039] In order to ensure the sealing reliability between the pressure plate 6 and the connecting pipe 3, the connecting pipe 3 and the pressure plate 6 are integrally formed to ensure the sealing effect and safety.

[0040] Reference Figures 1 to 5 The flexible connection end includes a connecting column 8 and a connecting boss 9. The two ends of the connecting column 8 are respectively connected to the flexible body 1 and the connecting boss 9. The connecting column 8 is disposed within the second communication port 7. The connecting boss 9 protrudes from the base 5 for mating with the pressure plate 6. The cross-sectional dimensions of the connecting boss 9 are larger than those of the second communication port 7. The connecting column 8 and the connecting boss 9 are integrally formed with the flexible body 1. The connecting column 8 and the connecting boss 9 are both provided with a first communication port 2 to achieve communication between the first communication port 2 and the empty chamber. In addition, by protruding the connecting boss 9 from the base 5, the end face of the connecting boss 9 becomes the end face of the flexible connection end, which is used for extrusion and mating with the pressure plate 6, thereby ensuring a sealing effect.

[0041] Specifically, the connecting boss 9 is flexibly deformed and passed through the second communication port 7 of the seat body 5. After passing through the second communication port 7, the connecting boss 9 returns to its original shape under the action of its own restoring force. Since the cross-sectional dimension of the connecting boss 9 is larger than the cross-sectional dimension of the second communication port 7, the reliability of the connection between the connecting boss 9 and the seat body 5 is guaranteed. Afterwards, the pressing plate 6 is pressed against the end face of the connecting boss 9 until the end face of the connecting boss 9 is pressed until it is parallel to the surface of the seat body 5 for mating with the pressing plate 6. Then, the pressing plate 6 can be connected to the seat body 5, ensuring the reliability of the position of the pressing plate 6 and the sealing effect.

[0042] A positioning assembly is provided between the base body 5 and the flexible connection end, and the positioning assembly includes a first positioning member 10 and a second positioning member 11 that are embedded and matched. One of the first positioning member 10 and the second positioning member 11 is provided on the flexible connection end, and the other is provided on the base body 5; the setting of the positioning assembly can ensure the stability of the connection between the flexible connection end and the base body 5, as well as the reliability of the position after the connection.

[0043] Exemplarily, the first positioning member 10 and the second positioning member 11 can be a positioning groove and a positioning rail, respectively. This embodiment is described as follows: the first positioning member 10 is a positioning groove, and the first positioning member 10 is arranged on the base body 5, and the second positioning member 11 is a positioning rail, and the second positioning member 11 is arranged on the flexible connection end. The first positioning member 10 can be arranged on the inner wall surface of the second connecting port 7 of the base body 5, and the second positioning member 11 can be arranged on the connecting column of the flexible connection end; and after the connecting boss 9 passes through the second connecting port 7, the positioning rail is embedded in the positioning groove, thereby ensuring the connection effect between the flexible connection end and the base body 5.

[0044] Of course, the first positioning member 10 can be arranged on the inner wall surface of the second connecting port 7 of the seat body 5, and the second positioning member 11 can be arranged on the connecting boss 9 of the flexible connecting end; and the connecting boss 9 passes through the second connecting port 7, and the positioning rail is embedded in the positioning groove. It can be known that at this time, part of the connecting boss 9 protrudes from the second connecting port 7, and the other part of the connecting boss 9 is located in the second connecting port 7, and is used to cooperate with the first positioning member 10 on the second connecting port 7, thereby ensuring the connection effect between the flexible connecting end and the seat body 5.

[0045] In addition, the first positioning member 10 can also be arranged on the side of the base body 5 facing the pressure plate 6, and the second connecting member 12 is arranged on the connecting boss 9 and is located on the side of the connecting boss 9 away from the pressure plate 6. After the connecting boss 9 passes through the second connecting port 7, the entire connecting boss 9 passes through the connecting boss 9, and the connecting column 8 at the flexible connecting end is used to cooperate with the second connecting port 7, and the side of the connecting boss 9 away from the pressure plate 6 is used to cooperate with the base body 5.

[0046] It can be known that when the first positioning member 10 is a positioning rail and the second positioning member 11 is a positioning groove, the above-mentioned solutions can also be used for connection and cooperation, and this embodiment will not be described in detail here.

[0047] Of course, the positioning groove and the positioning rail can be arranged in a block structure. In order to improve the connection effect, a plurality of positioning components can be provided, and the plurality of positioning components are arranged at intervals. In addition, in order to further improve the positioning effect, the positioning groove and the positioning rail can also be arranged in a ring structure.

[0048] Reference Figure 1 and Figure 2 The base 5 and the pressure plate 6 are detachably connected via a connector 12. This detachable connection between the base 5 and the pressure plate 6 facilitates installation and removal, as well as repair and replacement of the entire component. The connector 12 includes, but is not limited to, snap-fit ​​connections or screw connections. The connector 12 herein utilizes a plurality of flat-head screws, which are spaced apart.

[0049] Optionally, a plurality of the connecting members 12 are provided, and the plurality of the connecting members 12 include two, three or more connecting members 12. The setting of the plurality of connecting members 12 can improve the connection reliability between the seat body 5 and the pressure plate 6. In addition, the plurality of connecting members 12 can further ensure the extrusion effect of the pressure plate 6 on the end face of the flexible connection end, thereby ensuring the sealing.

[0050] The connecting pipe 3 is provided with a mounting seat 13 on its outer sleeve, and a mounting groove 14 is provided on the side of the mounting seat 13 away from the flexible body 1, and the sealing member 4 is embedded in the mounting groove 14 and protrudes from the mounting groove 14; through the arrangement of the mounting seat 13, after the connecting pipe and the connecting port of the mounting component are plugged in and matched, the mounting seat 13 can be supported on the mounting component, and then the connecting port is sealed by the sealing member 4 protruding from the mounting groove 14, thereby ensuring the reliability of the connection position of the connecting pipe and improving the connection effect.

[0051] Of course, in order to ensure the stability of the mounting seat 13, the mounting seat 13 can be set on the pressing plate 6, for example, the mounting seat 13 is connected to the pressing plate 6 by means of welding or clamping. Of course, the mounting seat 13 can also be integrally formed with the pressing plate 6 to ensure structural strength.

[0052] The expander further includes a connecting assembly for connecting the mounting component and the connecting pipe 3. The connecting assembly further improves the connection effect of the connecting pipe 3 on the mounting component. The connecting assembly can be a buckle or other component.

[0053] Furthermore, the connection assembly includes a gasket 15 and a screw 16, which are sequentially sleeved on the connecting tube 3. The screw 16 is threadedly engaged with the connecting tube 3 and secures the gasket 15 to the mounting component. The gasket 15 provides a certain degree of protection, and the screw 16 is then threadedly engaged with the connecting tube 3 to secure the connecting tube 3 to the mounting component. Optionally, the gasket 15 can be a silicone gasket, for example, and can further include a flat washer 151 and a spring washer 152, which are sequentially arranged.

[0054] It should be noted that the cross-sectional shapes of the first communication port 2 , the second communication port 7 and the communication pipe 3 in this embodiment are not limited, and their cross-sectional shapes may be circular or rectangular.

[0055] In summary, the expander provided in this embodiment first inserts the connecting boss 9 of the flexible connection end into the second communication port 7 of the base body 5. The connecting boss 9 is then positioned so as to protrude from the base body 5. The base body 5 and the flexible connector 12 are connected via a positioning assembly. The pressure plate 6 is fixedly connected to the base body 5 via the connector 12, and the connecting boss 9 is squeezed and fixed during the fixing process. The seal 4 is then fixed within the mounting groove 14 of the mounting seat 13. The connecting pipe 3 extends through the connection port of the mounting component. The connecting assembly and the mounting seat 13 are located on opposite sides of the mounting component. The connecting pipe 3 is fixed to the mounting component by the threaded connection 16 between the connecting pipe 3 and the threaded connection 16.

[0056] The expander only needs to be connected to the mounting component through the connecting pipe 3 to achieve a fixed connection between the entire device and the mounting component. Compared with existing expanders, this can effectively reduce the installation area on the mounting component, while also reducing the risk of poor sealing and improving sealing reliability. In addition, the expander can be assembled as a single component, improving assembly efficiency.

[0057] Reference Figures 1-6 The embodiment of the present application further provides a high-pressure oil tank, including a tank body and the expander as described above, wherein the tank body is provided with an upper cover 17, and a connecting port is opened through the upper cover 17, the expander is arranged in the tank body, the connecting pipe 3 of the expander is plugged into the connecting port, and the outer peripheral side of the seal 4 of the expander is sealed with the connecting port.

[0058] The expander is arranged in the box body, and the connecting pipe 3 of the expander is inserted into the connecting port and extends out of the upper cover 17, so that the outside air can be connected with the empty chamber of the expander flexible body 1 through the connecting pipe 3; then the sealing member 4 seals the connecting port, the cushioning member 15 is attached to the side of the upper cover 17 away from the box body, and then the connecting pipe 3 is fixedly connected to the upper cover 17 through the screw connection member 16.

[0059] In summary, after the expander is assembled on the high-pressure oil tank, it can effectively reduce the floor space occupied by the installation location and the number of screws required for sealing, reduce the risk of oil leakage, and improve installation efficiency.

[0060] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0061] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0062] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An expander, characterized in that: include: A flexible main body (1) is provided with an empty chamber formed therein, and a first communication port (2) communicating with the empty chamber is provided at a flexible connection end of the flexible main body (1); as well as A sealing component is connected to the flexible body (1) and is squeezed and sealed with the end face of the flexible connection end of the flexible body (1). The sealing component includes a connecting pipe (3) connected to the first connecting port (2). The connecting pipe (3) is provided with a sealing member (4) on its outer sleeve. The sealing member (4) is used to be embedded and matched with the connecting port of the installation component, and the connecting pipe (3) is arranged to pass through the connecting port.

2. The expander according to claim 1, characterized in that The sealing assembly comprises a seat body (5) and a pressure plate (6); the seat body (5) is arranged on the flexible main body (1); a second communication port (7) is provided through the seat body (5) at a position corresponding to the first communication port (2); the pressure plate (6) is connected to the seat body (5) to squeeze the end surface of the flexible connection end; and the communication pipe (3) is arranged on the pressure plate (6) and passes through the pressure plate (6).

3. The expander according to claim 2, characterized in that The connecting pipe (3) and the pressing plate (6) are integrally formed.

4. The expander according to claim 2, characterized in that The flexible connecting end comprises a connecting column (8) and a connecting boss (9) connected to each other, the two ends of the connecting column (8) are respectively connected to the flexible body (1) and the connecting boss (9), the connecting column (8) is arranged in the second connecting port (7), the connecting boss (9) protrudes from the seat (5) for cooperating with the pressure plate (6), and the cross-sectional size of the connecting boss (9) is larger than the cross-sectional size of the second connecting port (7).

5. The expander according to claim 2, characterized in that A positioning assembly is provided between the base (5) and the flexible connection end, and the positioning assembly comprises a first positioning member (10) and a second positioning member (11) that are embedded and matched with each other, one of the first positioning member (10) and the second positioning member (11) being provided on the flexible connection end, and the other being provided on the base (5).

6. The expander according to claim 2, characterized in that The seat body (5) and the pressing plate (6) are detachably connected via a connecting piece (12).

7. The expander according to any one of claims 1 to 6, characterized in that: The connecting pipe (3) is provided with a mounting seat (13) on its outer shell, and a mounting groove (14) is provided on a side of the mounting seat (13) away from the flexible body (1), and the sealing member (4) is embedded in the mounting groove (14) and protrudes from the mounting groove (14).

8. The expander according to claim 1, characterized in that It also includes a connecting component, which is used to connect the installation component and the connecting pipe (3).

9. The expander according to claim 8, characterized in that The connecting assembly comprises a cushioning member (15) and a screw-connecting member (16) which are sequentially sleeved on the connecting pipe (3); the screw-connecting member (16) is screwed together with the connecting pipe (3) and limits the cushioning member (15) to the mounting component.

10. A high-pressure fuel tank, characterized in that: The invention comprises a box body and an expander as described in any one of claims 1 to 9, wherein the box body is provided with an upper cover (17), a connection port is opened through the upper cover (17), the expander is arranged in the box body, the connecting pipe (3) of the expander is plugged into the connection port, and the outer peripheral side of the sealing member (4) of the expander is sealed with the connection port.

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