Sealing structure of binding post in fluorine pump and fluorine pump

Abstract

The invention relates to the technical field of fluorine pumps, in particular to a sealing structure of a binding post in a fluorine pump and the fluorine pump comprising the sealing structure. The sealing structure comprises a housing arranged in the housing, the interior of the housing is hollow to form a cavity with one closed end and the other open end, the open end of the housing is in sealed connection with the housing to form a sealed chamber surrounding the binding post, and the housing is provided with a through hole penetrating through the cavity; the sealing locking piece is arranged on the cover shell and seals the through hole, a through penetrating hole is formed in the sealing locking piece, a lead used for being connected with the binding post penetrates through the penetrating hole and extends into the concave cavity through the through hole, and the lead is in sealing fit with the penetrating hole. The binding post and one end, connected with the binding post, of the lead are arranged in the independent sealed chamber through the housing and the sealing locking piece, so that a refrigerant cannot enter the sealed chamber, and the refrigerant is fundamentally isolated from the binding post.

Description

Technical Field

[0001] The present invention relates to the technical field of fluorine pumps, and in particular to a sealing structure of a terminal inside a fluorine pump and a fluorine pump comprising the sealing structure. Background Art

[0002] The fluorine pump's terminal blocks are welded to the outer shell of the pump's pressure vessel, with some located inside the shell for connecting to the pump's internal leads. Inside the shell, the terminal blocks come into direct contact with the refrigerant inside the fluorine pump. When the ambient temperature of the fluorine pump compressor drops, causing the refrigerant to become liquid, the liquid refrigerant will submerge the terminal blocks, adversely affecting the pump's insulation and withstand voltage, and may also damage the terminal blocks, causing the compressor to shut down. Summary of the Invention

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sealing structure for the internal terminal of a fluorine pump, which can isolate the refrigerant inside the fluorine pump from contact with the terminal.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a sealing structure for a terminal inside a fluorine pump. The terminal is mounted on an outer shell of the fluorine pump and at least partly located inside the outer shell. The sealing structure comprises: a cover shell provided inside the outer shell, wherein the interior of the cover shell is hollow to form a concave cavity with one end closed and the other end open, wherein the open end of the cover shell is sealedly connected to the outer shell to form a sealed chamber surrounding the terminal. A through hole penetrating the concave cavity is provided on the cover shell; a sealing locking piece provided on the cover shell and sealing the through hole, wherein a through hole is provided inside the sealing locking piece, wherein a lead wire for connecting the terminal is passed through the through hole and extends into the concave cavity through the through hole, and the lead wire is sealedly fitted with the through hole.

[0006] Preferably, the sealing and locking member is passed through the through hole.

[0007] Preferably, the sealing and locking member includes a carrier, a sealing ring and a fastener. The carrier is sealed and connected to the through hole. A through first axial hole is provided inside the carrier. An annular groove is circumferentially provided on the hole wall of the first axial hole. The sealing ring is embedded in the annular groove. The inner hole diameter of the sealing ring is smaller than the diameter of the first axial hole. The fastener is sealed and connected to the first axial hole and presses the sealing ring. A through second axial hole is provided inside the fastener. The second axial hole, the inner hole of the sealing ring and the first axial hole are connected to form a through hole.

[0008] Preferably, the sealing locking member also includes a nut, which is arranged on the outside of the cover shell and is sealed with the cover shell on the outer peripheral side of the through hole. The supporting member includes a first column and a first boss arranged on the outer peripheral surface of one end of the first column. The outer peripheral surface of the first column is provided with an external thread. The first column is passed through the through hole and the nut. The external thread of the first column is matched with the nut. The first boss is located in the concave cavity and presses the cover shell.

[0009] Preferably, an internal thread is provided on the wall of the first axial hole avoiding the annular groove, and the fastener includes a second column and a second boss provided on the outer peripheral surface of one end of the second column, an external thread is provided on the outer peripheral surface of the second column, the second column is passed through the first axial hole, the external thread of the second column is matched with the internal thread of the first axial hole, and the second boss is located in the concave cavity and presses the supporting component.

[0010] Preferably, a plurality of annular grooves are provided on the wall of the first axial hole at axial intervals, a sealing ring is embedded in each annular groove, a clamping member is provided between each two adjacent sealing rings to clamp one of the sealing rings away from the fastener, the sealing ring closest to the fastener is clamped by the fastener, and a third axial hole is provided inside the clamping member, which connects the inner holes of the two adjacent sealing rings.

[0011] Preferably, the sealing and locking member is arranged outside the housing and covers the through hole.

[0012] Preferably, a connecting column extends from the outer surface of the cover shell, the interior of the connecting column is penetrated to form a through hole, a blind hole is opened on one end surface of the sealing locking piece, a through hole is opened on the bottom wall of the blind hole, the connecting column is sealed and connected to the blind hole, and the through hole is connected to the through hole.

[0013] Preferably, the lead wire is sealed with the through hole via a sealing body.

[0014] The present invention also provides a fluorine pump, comprising the sealing structure of the internal terminal of the fluorine pump as described above.

[0015] Compared with the prior art, the present invention has significant improvements:

[0016] The sealing structure of the fluorine pump's internal terminal blocks, using a housing and a sealing locking member, encloses the terminals and the end of the lead wire connected to the terminals in a separate, sealed chamber, preventing refrigerant from entering. This fundamentally isolates the refrigerant from contact with the terminals. Consequently, even if the refrigerant transforms into a liquid conductor as the ambient temperature of the fluorine pump compressor decreases, it will not adversely affect the pump's insulation withstand voltage, effectively preventing refrigerant damage to the terminals and causing compressor shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a cross-sectional schematic diagram of the assembly of the sealing structure of the internal terminal of the fluorine pump and the fluorine pump housing according to the first embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of the sealing locking member in the sealing structure of the internal terminal of the fluorine pump according to the first embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional schematic diagram of a bearing member in the sealing structure of the internal terminal of the fluorine pump according to the first embodiment of the present invention.

[0020] Figure 4 It is a cross-sectional schematic diagram of the assembly of the sealing structure of the internal terminal of the fluorine pump and the fluorine pump housing according to the second embodiment of the present invention.

[0021] The description of the accompanying drawings is as follows:

[0022] 1 Binding Post

[0023] 2. Housing

[0024] 3 Cover

[0025] 30 cavity

[0026] 31 through holes

[0027] 32 Connecting column

[0028] 4 Sealing locking piece

[0029] 40 piercings

[0030] 41 bearings

[0031] 410 first shaft hole

[0032] 411 annular groove

[0033] 412 First Pillar

[0034] 413 First Boss

[0035] 42 sealing ring

[0036] 420 inner hole

[0037] 43 Fasteners

[0038] 430 Second axis hole

[0039] 431 Second Pillar

[0040] 432 Second Boss

[0041] 44 Nut

[0042] 45 First sealing gasket

[0043] 46 Second sealing gasket

[0044] 47 Pressing piece

[0045] 470 third axis hole

[0046] 48 blind holes

[0047] 49 sealing body

[0048] 5 leads DETAILED DESCRIPTION

[0049] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0053] Example 1

[0054] like Figures 1 to 3 FIG. 1 shows a first embodiment of the sealing structure of the internal terminal of the fluorine pump provided by the present invention.

[0055] See also Figure 1The terminal 1 inside the fluorine pump is installed on the outer shell 2 of the fluorine pump, and the outer shell 2 constitutes the outermost shell of the fluorine pump pressure vessel. The terminal 1 has at least a portion located inside the outer shell 2, which is used to connect the lead 5 inside the fluorine pump, and the lead 5 is the lead-out wire of the motor terminal. The terminal 1 also has at least a portion located outside the outer shell 2, which is used to connect to an external power supply. The sealing structure of the internal terminal of the fluorine pump of this embodiment 1 is arranged inside the outer shell 2, which is used to isolate the terminal 1 inside the outer shell 2 from the refrigerant, and plays a role in sealing and protecting the terminal 1.

[0056] The sealing structure of the internal terminal of the fluorine pump of the first embodiment includes a cover 3 and a sealing locking member 4. The cover 3 is arranged inside the outer shell 2. The inner hollow of the cover 3 forms a concave cavity 30 which is closed at one end and open at the other end. Preferably, the cover 3 adopts a thin-walled cylindrical structure. The open end of the cover 3 (that is, the open end of the concave cavity 30) is sealed with the outer shell 2 to form a sealed chamber surrounding the terminal 1. The terminal 1 located inside the outer shell 2 is accommodated in the sealed chamber and isolated from the refrigerant in the outer shell 2. The open end of the cover 3 is preferably connected to the outer shell 2 by welding to form a seal, which can ensure that the refrigerant cannot leak from the connection between the cover 3 and the outer shell 2 into the sealed chamber and contaminate the terminal 1. Therefore, the material of the cover 3 is preferably a weldable material, such as steel. A through hole 31 is provided on the cover 3 to pass through the concave cavity 30. The through hole 31 is preferably arranged on the closed end of the cover 3 (that is, the closed end of the concave cavity 30). A sealing locking member 4 is mounted on the housing 3 and seals the through-hole 31 therein, ensuring the airtightness of the sealed chamber. A through-hole 40 is provided within the sealing locking member 4. A lead 5 for connecting to the terminal 1 passes through the through-hole 40 within the sealing locking member 4 and extends through the through-hole 31 in the housing 3 into the recessed cavity 30, thereby connecting to the terminal 1 within the sealed chamber. The lead 5 seals against the through-hole 40, ensuring the airtightness of the sealed chamber.

[0057] The sealing structure of the internal terminal of the fluorine pump of this embodiment 1 uses a cover 3 and a sealing locking member 4 to construct the terminal 1 and the end of the lead 5 connected to the terminal 1 into an independent sealed chamber, preventing the refrigerant from entering the chamber, thereby fundamentally isolating the refrigerant from contacting the terminal 1. Therefore, even if the refrigerant turns into a liquid conductor as the operating temperature of the fluorine pump compressor decreases, it will not have a negative impact on the insulation withstand voltage of the fluorine pump, effectively preventing the refrigerant from damaging the terminal 1 and causing the compressor to shut down.

[0058] See also Figure 1 In the first embodiment, preferably, the sealing locking member 4 is passed through the through hole 31 on the cover 3, and the through hole 31 is sealed by the sealing locking member 4 passed through the through hole 31, and the lead 5 passes through the through hole 40 inside the sealing locking member 4 and extends into the concave cavity 30 of the cover 3 to be connected with the terminal 1.

[0059] Combine Figure 2 and Figure 3 Preferably, the sealing and locking member 4 includes a carrier 41, a sealing ring 42 and a fastener 43. The carrier 41 passes through the through hole 31 on the cover 3 and is sealed with the through hole 31, thereby sealing the through hole 31. A through first axial hole 410 is provided inside the carrier 41, and an annular groove 411 is circumferentially provided on the hole wall of the first axial hole 410, and the sealing ring 42 is embedded in the annular groove 411. The diameter of the inner hole 420 of the sealing ring 42 is smaller than the diameter of the first axial hole 410, so that the radial inner side of the sealing ring 42 protrudes from the hole wall of the first axial hole 410. The fastener 43 passes through the first axial hole 410, and the fastener 43 is sealed with the first axial hole 410 and presses the sealing ring 42. The interior of the fastener 43 is provided with a second axial hole 430 extending therethrough. The second axial hole 430 of the fastener 43, the inner hole 420 of the sealing ring 42, and the first axial hole 410 of the carrier 41 are connected to form the through-hole 40 of the sealing locking member 4, through which the lead 5 is passed. The sealing ring 42 is compressed by the fastener 43, causing it to be compressed and radially bulged. The outer annular surface of the sealing ring 42 is in close contact with the annular groove 411, while the inner annular surface (inner hole 420) of the sealing ring 42 squeezes the lead 5, forming a seal. This achieves a sealed fit between the lead 5 and the through-hole 40, and the sealing locking member 4 seals the lead 5. Preferably, the diameter of the second axial hole 430 of the fastener 43 is adapted to the diameter of the lead 5, allowing the lead 5 to pass through the second axial hole 430 while also effectively constraining the lead 5.

[0060] In the first embodiment, preferably, the sealing locking member 4 further includes a nut 44 having an internal thread. The nut 44 is disposed on the outside of the housing 3 and is sealed to the housing 3 on the outer peripheral side of the through hole 31 on the housing 3. The nut 44 is coaxially disposed with the through hole 31. The nut 44 and the housing 3 are preferably connected by welding to form a seal. The supporting member 41 includes a first column 412 and a first boss 413. The first column 412 and the first boss 413 are both cylindrical. The first boss 413 is disposed on the outer peripheral surface of one end of the first column 412. The outer peripheral surface of the first column 412 is provided with an external thread. The first column 412 is passed through the through hole 31 and the nut 44. The external thread of the first column 412 cooperates with the nut 44 to provide a tightening force. The first boss 413 is located in the concave cavity 30 of the housing 3 and presses the housing 3 with the tightening force. Thus, the carrier 41 passes through the through hole 31 on the housing 3 and is sealed with the through hole 31. Preferably, a first sealing gasket 45 is provided between the first boss 413 and the housing 3 to further ensure sealing.

[0061] In the first embodiment, preferably, an internal thread is provided on the wall of the first axial hole 410 inside the carrier 41, avoiding the annular groove 411. The fastener 43 includes a second column 431 and a second boss 432. The second column 431 and the second boss 432 are both cylindrical. The second boss 432 is provided on the outer circumferential surface of one end of the second column 431. The outer circumferential surface of the second column 431 is provided with an external thread. The second column 431 passes through the first axial hole 410. The external thread of the second column 431 cooperates with the internal thread of the first axial hole 410 to provide a tightening force. The end of the second column 431 away from the second boss 432 presses the sealing ring 42 through this tightening force. At the same time, the second boss 432 located in the concave cavity 30 of the housing 3 also presses the carrier 41 through this tightening force. In this way, the fastener 43 is sealedly connected to the first axial hole 410 of the carrier 41 and presses the sealing ring 42. Preferably, a second sealing gasket 46 is provided between the second boss 432 and the carrier 41 to further ensure sealing. In this first embodiment, the axial spacing between the end face of the second column 431 of the fastener 43, which is away from the second boss 432, and the end face of the second boss 432, which is closer to the second column 431, is greater than the axial spacing between the end face of the annular groove 411 closest to the first boss 413 in the carrier 41, which is closer to the first boss 413, and the end face of the first boss 413, which is away from the first column 412. This allows the second column 431 to contact and press the sealing ring 42 embedded in the annular groove 411 when connected to the first axial hole 410.

[0062] In the first embodiment of the present invention, preferably, a plurality of annular grooves 411 are axially spaced apart on the wall of the first axial hole 410 inside the carrier 41, and a sealing ring 42 is embedded in each annular groove 411. A pressing member 47 is provided between each adjacent sealing ring 42 (that is, between each adjacent annular groove 411). The pressing member 47 is sealed and connected to the first axial hole 410, and presses one of the two adjacent sealing rings 42 away from the fastener 43, and the sealing ring 42 closest to the fastener 43 is pressed by the fastener 43. A through third axial hole 470 is provided inside the pressing member 47, and the third axial hole 470 is connected to the inner holes 420 of the two adjacent sealing rings 42 for the lead 5 to pass through. The diameter of the third axial hole 470 is preferably adapted to the diameter of the lead 5, so that the lead 5 can pass through the third axial hole 470, while also having a good restraining effect on the lead 5. The sealing ring 42, compressed by the fastener 43 and the pressing member 47, is compressed and radially expanded. The outer surface of the sealing ring 42 abuts against the annular groove 411, while the inner surface (inner hole 420) of the sealing ring 42 squeezes the lead 5, forming a seal. Providing multiple sealing rings 42 can enhance the sealing effect of the sealing locking member 4 on the lead 5.

[0063] In the first embodiment of the present invention, an external thread is provided on the outer peripheral surface of the clamping member 47, and the clamping member 47 is passed through the first axial hole 410 inside the supporting member 41. The external thread of the clamping member 47 is matched with the internal thread of the first axial hole 410, thereby realizing a tight connection between the clamping member 47 and the first axial hole 410, and the sealing ring 42 can be compressed by applying torque to the clamping member 47.

[0064] In the first embodiment, the number of the sealing rings 42 is not limited. For example, Figures 1 to 3 It is shown that two sealing rings 42 are provided, and two annular grooves 411 are axially spaced apart on the hole wall of the first axial hole 410 of the carrier 41. The two sealing rings 42 are respectively embedded in the two annular grooves 411, and a pressing member 47 is provided between the two annular grooves 411.

[0065] When assembling the sealing structure of the internal terminal of the fluorine pump of the first embodiment, first pass the first column 412 of the carrier 41 through the first sealing gasket 45 and then pass through the through hole 31 on the cover shell 3 from the inner side of the cover shell 3 and tighten it with the nut 44 to achieve a tight connection between the sealing locking member 4 and the cover shell 3; then pass the lead 5 through the first axial hole 410 of the carrier 41, the first sealing ring 42 is sleeved on the lead 5 and placed in the first annular groove 411 in the first axial hole 410 away from the first boss 413, and then the pressing member 47 is sleeved on the lead 5 and screwed into the first axial hole 410 from the end of the first axial hole 410 close to the first boss 413 until the pressing member 47 reaches between the two annular grooves 411 and presses the first sealing ring 42, so that the outer ring surface of the first sealing ring 42 is tightly attached to the cover shell 3. The first annular groove 411 and the inner hole 420 of the first sealing ring 42 squeeze the lead wire 5 to form a seal. The second sealing ring 42 is then inserted over the lead wire 5 and placed in the second annular groove 411 near the first boss 413 in the first axial hole 410. After the second column 431 of the fastener 43 passes through the second sealing gasket 46, the lead wire 5 is passed through the second axial hole 430 of the fastener 43. The second column 432 of the fastener 43 is then screwed into the first axial hole 410 from the end near the first boss 413 of the first axial hole 410 until the second column 431 of the fastener 43 presses the second sealing ring 42, so that the outer annular surface of the second sealing ring 42 is tightly against the second annular groove 411 and the inner hole 420 of the second sealing ring 42 squeezes the lead wire 5 to form a seal. As a result, the sealing locking member 4 simultaneously seals the lead wire 5 through the two sealing rings 42. Then, one end of the lead wire 5 extending into the cavity 30 of the cover 3 is connected to the terminal 1 , and finally, the open end of the cover 3 is welded to the outer shell 2 .

[0066] Example 2

[0067] like Figure 4FIG. 2 shows a second embodiment of the sealing structure for the internal terminal of a fluorine pump provided by the present invention. This second embodiment is substantially identical to the first embodiment, and the similarities are not repeated here. The difference lies in that the sealing locking member 4 in this second embodiment seals the through hole 31 on the housing 3 in a different manner than in the first embodiment.

[0068] Specifically, in this second embodiment, the sealing and locking member 4 is disposed on the exterior of the housing 3 and covers the through-hole 31. A through-hole 40 within the sealing and locking member 4 communicates with the through-hole 31. The sealing and locking member 4 covers the through-hole 31, sealing it. The lead 5 passes through the through-hole 40 within the sealing and locking member 4 and extends through the through-hole 31 into the recessed cavity 30 of the housing 3, where it connects to the terminal 1. The seal between the lead 5 and the through-hole 40 ensures tightness.

[0069] Preferably, in the second embodiment, a connecting column 32 extends from the outer surface of the cover shell 3, and the interior of the connecting column 32 is penetrated to form a through hole 31. A blind hole 48 is provided on one end surface of the sealing locking member 4, and a through hole 40 is provided on the bottom wall of the blind hole 48. The connecting column 32 on the cover shell 3 is sealedly connected to the blind hole 48 of the sealing locking member 4, and the through hole 31 on the cover shell 3 is connected to the through hole 40 on the sealing locking member 4. The lead wire 5 passes through the through hole 40 and the through hole 31 and extends into the concave cavity 30 of the cover shell 3.

[0070] In this second embodiment, preferably, the outer circumferential surface of the connecting post 32 on the housing 3 is provided with an external thread, and the inner circumferential wall of the blind hole 48 of the sealing and locking member 4 is provided with an internal thread. The connecting post 32 is inserted into the blind hole 48, and the external thread of the connecting post 32 and the internal thread of the blind hole 48 cooperate to achieve a sealed connection between the connecting post 32 on the housing 3 and the blind hole 48 of the sealing and locking member 4. To enhance the sealing performance, preferably, a sealing material such as sealant can be added between the connecting post 32 and the blind hole 48 to further seal the connection.

[0071] In this second embodiment, preferably, a sealing member 49 is provided between the lead wire 5 and the through-hole 40 of the sealing and locking member 4 to provide a seal. The material of the sealing member 49 is not limited and may be, for example, a sealing glass or a sealant. By providing the sealing member 49 between the lead wire 5 and the through-hole 40 of the sealing and locking member 4, the sealing member 4 can conveniently and reliably seal the lead wire 5. The sealing and locking member 4 is preferably made of steel to support the sealing member 49.

[0072] When assembling the sealing structure of the internal terminal of the fluorine pump of the second embodiment, the lead wire 5 can be first passed through the through hole 40 of the sealing locking member 4, and the through hole 40 is sealed by the sealing body 49 to fix the lead wire 5; then the blind hole 48 of the sealing locking member 4 is screwed onto the connecting post 32 on the cover 3, so that the internal thread of the blind hole 48 is tightened with the external thread of the connecting post 32 to achieve a tight connection between the sealing locking member 4 and the cover 3, and further sealing can be achieved by adding sealing materials such as sealant between the connecting post 32 and the blind hole 48; then, the lead wire 5 is extended into the concave cavity 30 of the cover 3 through the through hole 31 on the cover 3 and connected to the terminal 1 at one end, and finally the open end of the cover 3 is welded to the outer shell 2.

[0073] Example 3

[0074] The third embodiment is an embodiment of the fluorine pump provided by the present invention. The fluorine pump of the third embodiment includes the sealing structure of the internal terminal of the fluorine pump of the present invention, and the sealing structure can be any one of the sealing structures in the first and second embodiments described above.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sealing structure for a terminal inside a fluorine pump, wherein the terminal (1) is mounted on a housing (2) of the fluorine pump and at least part of the terminal is located inside the housing (2), characterized in that: The sealing structure comprises: A cover shell (3) is provided inside the outer shell (2); the inner portion of the cover shell (3) is hollow to form a concave cavity (30) with one end closed and the other end open; the open end of the cover shell (3) is sealedly connected to the outer shell (2) to form a sealed chamber surrounding the terminal (1); the cover shell (3) is provided with a through hole (31) penetrating the concave cavity (30); A sealing locking member (4) is provided on the cover (3) and seals the through hole (31). A through hole (40) is provided inside the sealing locking member (4). A lead wire (5) for connecting the terminal (1) is passed through the through hole (40) and extends into the cavity (30) through the through hole (31). The lead wire (5) is sealed and matched with the through hole (40).

2. The sealing structure of the internal terminal of the fluorine pump according to claim 1, characterized in that: The sealing and locking member (4) is passed through the through hole (31).

3. The sealing structure of the internal terminal of the fluorine pump according to claim 2, characterized in that: The sealing locking member (4) includes a bearing member (41), a sealing ring (42) and a fastener (43). The bearing member (41) is sealed and connected to the through hole (31). A through first axial hole (410) is provided inside the bearing member (41). An annular groove (411) is provided on the hole wall of the first axial hole (410) along the circumferential direction. The sealing ring (42) is embedded in the annular groove (411). The diameter of the inner hole (420) of the sealing ring (42) is smaller than the diameter of the first axial hole (410). The fastener (43) is sealed and connected to the first axial hole (410) and presses the sealing ring (42). A through second axial hole (430) is provided inside the fastener (43). The second axial hole (430), the inner hole (420) of the sealing ring (42) and the first axial hole (410) are connected to form the through hole (40).

4. The sealing structure of the internal terminal of the fluorine pump according to claim 3, characterized in that: The sealing locking member (4) also includes a nut (44), which is arranged on the outside of the cover shell (3) and is sealed with the cover shell (3) on the outer peripheral side of the through hole (31). The supporting member (41) includes a first column (412) and a first boss (413) arranged on the outer peripheral surface of one end of the first column (412). The outer peripheral surface of the first column (412) is provided with an external thread. The first column (412) is passed through the through hole (31) and the nut (44). The external thread of the first column (412) is matched with the nut (44). The first boss (413) is located in the concave cavity (30) and presses the cover shell (3).

5. The sealing structure of the internal terminal of the fluorine pump according to claim 3, characterized in that: An internal thread is provided on the hole wall of the first axial hole (410) avoiding the annular groove (411), and the fastener (43) includes a second column (431) and a second boss (432) provided on the outer peripheral surface of one end of the second column (431), and an external thread is provided on the outer peripheral surface of the second column (431). The second column (431) is passed through the first axial hole (410), and the external thread of the second column (431) is matched with the internal thread of the first axial hole (410). The second boss (432) is located in the concave cavity (30) and presses the bearing member (41).

6. The sealing structure of the internal terminal of the fluorine pump according to claim 3, characterized in that: A plurality of annular grooves (411) are provided on the hole wall of the first axial hole (410) at intervals along the axial direction, and a sealing ring (42) is embedded in each annular groove (411). A pressing member (47) is provided between each two adjacent sealing rings (42) to press one of the sealing rings (42) away from the fastener (43). The sealing ring (42) closest to the fastener (43) is pressed by the fastener (43). A through third axial hole (470) is provided inside the pressing member (47), and the third axial hole (470) is connected to the inner holes (420) of the two adjacent sealing rings (42).

7. The sealing structure of the internal terminal of the fluorine pump according to claim 1, characterized in that: The sealing and locking member (4) is arranged outside the cover shell (3) and covers the through hole (31).

8. The sealing structure of the internal terminal of the fluorine pump according to claim 7, characterized in that: A connecting column (32) extends from the outer surface of the cover shell (3), and the interior of the connecting column (32) is penetrated to form the through hole (31). A blind hole (48) is provided on one end surface of the sealing locking member (4), and the through hole (40) is provided on the bottom wall of the blind hole (48). The connecting column (32) is sealedly connected to the blind hole (48), and the through hole (31) is connected to the through hole (40).

9. The sealing structure of the internal terminal of the fluorine pump according to claim 8, characterized in that: The lead wire (5) and the through hole (40) are sealed together via a sealing body (49).

10. A fluorine pump, characterized in that: A sealing structure comprising the internal terminal of a fluorine pump as claimed in any one of claims 1 to 9.

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