A sealing structure for a direct-current pump

Abstract

The present invention provides a sealing structure for a direct-current pump, which relates to the technical field of pumps. Among them, this sealing structure of the direct-current pump includes: a cavity assembly, a movable assembly, and an inlet flow channel. The cavity assembly includes a first cavity, a second cavity, and a sealing ring; the first cavity has a cavity, an opening and an outlet communicating with the cavity; the second cavity is embedded in the opening, and a sealing groove is formed between the second cavity and the first cavity on the side wall of the cavity; the sealing ring is arranged in the sealing groove. The movable assembly can movably pass through the second cavity to divide the cavity into a compression chamber and an activity chamber; by combining the first cavity and the second cavity, a sealing groove is formed in the cavity, which can ensure the accuracy of the sealing groove. Setting the sealing groove on the cavity assembly instead of on the movable assembly can ensure that the surface of the movable assembly is flat and has sufficient strength.

Description

Technical Field

[0001] The present invention relates to the field of pumps, and more particularly, to a sealing structure for a direct-current pump. Background Art

[0002] With the development of technology, water-using devices such as oral irrigators and water supply devices are applied to people's lives, bringing great convenience to people's lives. The above water-using devices all need to install water pumps. Among them, the piston pump is relatively commonly used.

[0003] The piston sealing method of traditional piston pumps is to directly sleeve a sealing ring on the piston. This structure is not suitable for small-volume piston pumps and is prone to piston breakage. Summary of the Invention

[0004] The present invention provides a sealing structure for a direct-current pump, aiming to improve the problem that the traditional sealing structure is not suitable for small-volume pumps.

[0005] To solve the above technical problems, the present invention provides a sealing structure for a direct-current pump, which includes:

[0006] A cavity assembly, including a first cavity, a second cavity, and a sealing ring; the first cavity has a cavity, an opening and an outlet communicating with the cavity; the second cavity is embedded in the opening, and a sealing groove is formed between the second cavity and the first cavity on the side wall of the cavity; the sealing ring is arranged in the sealing groove;

[0007] A movable assembly, which can movably pass through the second cavity to divide the cavity into a compression chamber and an activity chamber; the movable assembly is configured to compress the fluid in the compression chamber so that the fluid can flow out from the check valve;

[0008] An inflow channel, which passes through the movable assembly and communicates with the compression chamber; used to supply external fluid into the compression chamber.

[0009] Optionally, the sealing structure further includes a one-way valve; the one-way valve is arranged in the inflow channel; the cavity assembly further includes a check valve; the check valve is arranged at the outlet; external fluid can pass through the one-way valve into the compression chamber and can flow out through the check valve.

[0010] Optionally, the movable assembly has a sealing portion located in the cavity and a connecting portion extending outward through the second cavity; the diameter of the sealing portion is larger than that of the connecting portion to tightly cooperate with the sealing ring; the sealing portion can abut against the second cavity to prevent it from coming out of the cavity.

[0011] Optionally, one of the first cavity and the second cavity is provided with a card slot, and the other is provided with a card projection adapted to the card slot; the card slot and the card projection are annular.

[0012] Optionally, one of the first cavity and the second cavity is provided with an external spline-shaped mounting portion, and the other is provided with an internal spline-shaped fitting portion adapted to the mounting portion.

[0013] Optionally, one of the side wall of the activity room and the surface of the activity component is provided with a linear groove, and the other is provided with a second protrusion adapted to the linear groove; the linear groove is arranged along the axial direction of the activity component; the second protrusion is slidably disposed in the groove to limit the rotation of the activity component.

[0014] Optionally, the cavity assembly further includes a fixing member for fixing the check valve; the fixing member has a flared mouth for sleeving the check valve. The check valve is a duckbill valve.

[0015] Optionally, the sealing structure further includes:

[0016] A driving assembly for driving the activity component to move a distance A in the direction of compressing the compression chamber;

[0017] The length of the compression chamber is B; the length of the sealing portion is C; wherein, 0.25(B - C) ≤ A ≤ 0.35(B - C);

[0018] The driving assembly includes a round wire helical spring located in the compression chamber; the round wire helical spring is used to drive the activity component to move in the direction of expanding the compression chamber; the original length of the round wire helical spring is F; wherein, 0.83F ≤ B - C ≤ 0.9F;

[0019] The maximum distance from the sealing ring to the connection of the sealing portion and the connecting portion is D; the diameter of the compression chamber is E; wherein, B - C = E, D - A > 1 mm.

[0020] Optionally, the compression distance A of the activity component = 3.5 mm; the length B of the compression chamber = 23 mm; the length C of the sealing portion = 11.5 mm; the maximum distance D from the sealing ring to the connection of the sealing portion and the connecting portion = 5 mm; the diameter E of the compression chamber = 11.6 mm.

[0021] Optionally, the first cavity and the second cavity are fixed by welding; the sealing ring is an O-ring or a Y-ring.

[0022] By adopting the above technical solutions, the present invention can achieve the following technical effects:

[0023] By combining the first cavity and the second cavity, a sealing groove is formed in the accommodating cavity. Setting the sealing groove on the cavity assembly rather than on the movable assembly can ensure that the surface of the movable assembly is flat and has sufficient strength.

[0024] Moreover, by combining the first cavity and the second cavity to form the sealing groove, not only can the installation of the sealing ring be made simpler, but also the accuracy of the sealing groove can be ensured, guaranteeing the sealing performance, which has great practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is the first axonometric view of the direct-current pump;

[0027] Figure 2 is the second axonometric view of the direct-current pump (half of the outer shell is hidden for easy display);

[0028] Figure 3 is the third axonometric view of the direct-current pump (half of the outer shell and half of the cavity assembly are hidden for easy display);

[0029] Figure 4 is the axonometric view of the housing;

[0030] Figure 5 is the axonometric view when the cavity assembly, the movable assembly, and the driving assembly are in cooperation (half of the cavity assembly is hidden for easy display);

[0031] Figure 6 is the exploded view of the cavity assembly, the movable assembly, and the driving assembly (half of the cavity assembly is hidden for easy display);

[0032] Figure 7 is the exploded view of the cavity assembly (part of the features of the components are hidden for easy display);

[0033] Figure 8 is the exploded view of the movable assembly (part of the features of the components are hidden for easy display);

[0034] Figure 9 is the half-sectional view of the movable assembly;

[0035] Figure 10 is the axonometric view of the driving gear (part of the features of the component are hidden for easy display).

[0036] Markings in the figure: 1 - Cavity assembly; 2 - Duckbill valve; 3 - Compression chamber; 4 - Activity chamber; 5 - Opening; 6 - Friction protrusion; 7 - Linear groove; 9 - Driving gear; 10 - Second inclined surface; 11 - First protrusion; 12 - First inclined surface; 13 - Fourth inclined surface; 14 - Second protrusion; 15 - Third inclined surface; 16 - Sealing part; 17 - Inflow channel; 18 - Elastic part; 19 - Driving assembly; 20 - Connecting part; 21 - Activity assembly; 22 - Outlet; 23 - Fixing part; 24 - First cavity; 25 - Sealing ring; 26 - Second cavity; 27 - Fixing groove; 28 - Rib; 29 - Card slot; 30 - Mounting part; 31 - Fitting part; 32 - Card position protrusion; 33 - Limiting part; 34 - Movable part; 35 - Main body; 36 - Second flow channel; 37 - Second abutting part; 38 - First abutting part; 39 - Inclined end face; 40 - First flow channel; 41 - Gap; 42 - Outer shell assembly; 43 - Shell; 44 - Hemispherical protrusion; 45 - Power gear; 46 - Motor; 47 - Transmission chamber; 48 - Screw post; 4... Specific implementation mode

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] The present invention will be further described in detail below in conjunction with the drawings and specific implementation modes:

[0039] Example 1: Please refer to Figures 1 to 10 , the embodiment of the present invention provides a direct-current pump, including: a cavity assembly 1, an activity assembly 21, an inflow channel 17, and a check valve.

[0040] The cavity assembly 1 is internally provided with a cavity, as well as an opening 5 and an outlet 22 communicating with the cavity. The movable assembly 21 is movably located at the opening 5 to divide the cavity into a compression chamber 3 and an activity chamber 4. The inlet passage 17 passes through the movable assembly 21 and communicates with the compression chamber 3. A check valve is disposed in the inlet passage 17. External fluid can pass through the inlet passage 17 into the compression chamber 3, and the movable assembly 21 is configured to compress the fluid in the compression chamber 3 so that the fluid can flow out from the outlet 22.

[0041] Specifically, the movable assembly 21 can move from the compression chamber 3 to the activity chamber 4 to expand the compression chamber 3. A negative pressure is formed in the compression chamber 3, so that external fluid passes through the check valve and the inlet passage 17 into the compression chamber 3. The movable assembly 21 can move from the activity chamber 4 to the compression chamber 3 to compress the compression chamber 3. A positive pressure is formed in the compression chamber 3, so that the fluid inside the compression chamber 3 flows out from the outlet 22.

[0042] The inlet passage 17 is arranged on the movable assembly 21, so that the water inlet of the pump can extend substantially along the axial direction of the piston. There is no need to additionally provide a water inlet on the pump body, that is, the water inlet pipeline does not extend outward from the side of the compression chamber 3. Thus, the radial volume of the piston pump is greatly reduced, and it can be installed in some places with relatively narrow installation spaces, which has good practical significance.

[0043] In this embodiment, the external fluid can be liquid or gas. The inlet passage 17 is a passage for fluid to flow through.

[0044] On the basis of the above embodiment, as Figures 5 to 9 shown, in a preferred embodiment of the present invention, one of the side wall of the activity chamber 4 and the surface of the movable assembly 21 is provided with a linear groove 7, and the other is provided with a second protrusion 14 adapted to the linear groove 7; the linear groove 7 is arranged along the axial direction of the movable assembly 21. The second protrusion 14 is slidably disposed in the groove to limit the rotation of the movable assembly 21.

[0045] Specifically, the movable assembly 21 is used to compress the compression chamber 3, and its best structure is that the shapes of the cavity and the movable assembly 21 are both cylindrical geometric bodies. This makes the assembly more convenient and the sealing effect better.

[0046] In order to ensure that the movable assembly 21 does not swing during the movement process. A linear groove 7 is provided on the side wall of the activity chamber 4, and the movable assembly 21 has a second protrusion 14 that can be embedded in the linear groove 7. The linear groove 7 is arranged along the movement direction of the movable assembly 21. The second protrusion 14 can slide in the linear groove 7 to make the movable assembly 21 slide more smoothly.

[0047] In this embodiment, the number of the straight grooves 7 is four, and the number of the second protrusions 14 is two, so that it can be more quickly installed into the straight grooves 7 during assembly. It can be understood that in other embodiments, the number of the straight grooves 7 can be any number more than two, and only needs to be circumferentially and uniformly distributed along the axis of the activity room 4. At the same time, the number of the second protrusions 14 can also be a number other than two, and only needs to be circumferentially and uniformly distributed along the axis of the activity room 4. The number of the straight grooves 7 and the second protrusions 14 is not specifically limited herein.

[0048] On the basis of the above embodiment, as Figures 5 to 9 shown, in a preferred embodiment of the present invention, the movable assembly 21, the inflow channel 17, and the opening 5 are coaxially arranged.

[0049] Specifically, the part of the inflow channel 17 located on the movable assembly 21 is arranged at the axial position of the movable assembly 21, and the opening 5 is arranged facing the movable assembly 21, so that the movable assembly 21, the inflow channel 17, and the opening 5 are coaxially arranged. This enables the fluid flow direction not to change during the whole process of the fluid entering the compression chamber 3 through the inflow channel 17 and then spraying out from the outlet 22, with the minimum loss of fluid kinetic energy, greatly improving the working efficiency of the direct-flow pump.

[0050] It can be understood that in other embodiments, the inflow channel 17 can be arbitrarily arranged on the movable assembly 21, and does not need to be arranged at the axial position of the movable assembly 21. It can be parallel to the axis of the movable assembly 21 or not. It only needs to pass through the movable assembly 21 and communicate with the compression chamber 3. The present invention does not make specific limitations on this.

[0051] On the basis of the above embodiment, as Figure 8 、 9 shown, in a preferred embodiment of the present invention, the check valve is located on the movable assembly 21.

[0052] Specifically, a check valve is arranged on the inflow channel 17, which can effectively prevent the fluid from flowing back when the movable assembly 21 compresses the compression chamber 3. So that each time compression occurs, all the fluid in the compression chamber 3 can flow to the outlet 22. Arranging the check valve on the movable assembly 21 can greatly improve the integration degree of the direct-flow pump, reduce external components, and make the installation simpler during use.

[0053] It can be understood that in other embodiments, the check valve can be installed at any position outside the movable assembly 21 on the inflow channel 17, and can also play the same role. Moreover, a ready-made check valve can be purchased, with a lower cost.

[0054] On the basis of the above embodiment, as Figure 8 、 9As shown, in a preferred embodiment of the present invention, the movable component 21 includes a main body 35 that is movably located in the opening 5. The inflow channel 17 includes a first flow channel 40 provided in the main body 35. The one-way valve includes a movable member 34 movably disposed in the first flow channel 40 and a limiting member 33 for preventing the movable member 34 from disengaging from the first flow channel 40. The movable member 34 can abut against the main body 35 to seal the first flow channel 40 and abut against the limiting member 33 to connect the first flow channel 40 to the compression chamber 3.

[0055] Specifically, the outer surface of the main body 35 is in sealed sliding connection with the side wall of the cavity to prevent the fluid inside the compression chamber 3 from leaking into the activity chamber 4.

[0056] The inflow channel 17 includes a first flow channel 40 penetrating the main body 35. A movable member 34 is installed in the first flow channel 40, and a limiting member 33 for preventing the movable member 34 from disengaging from the first flow channel 40 is installed at one end of the first flow channel 40 on the side connecting the compression chamber 3.

[0057] When the movable member 34 moves in the direction close to the compression chamber 3, it can connect the first flow channel 40 and the compression chamber 3. When the movable member 34 moves in the direction away from the compression chamber 3, it can block the first flow channel 40 to separate the first flow channel 40 from the compression chamber 3, forming a special one-way valve structure. When the movable member 34 moves in the direction close to the compression chamber 3, an L-shaped through hole can be provided on the movable member 34 to connect the side surface of the movable member 34 and the compression chamber 3, or a through hole for the fluid to pass through can be opened on the limiting member 33.

[0058] In other embodiments, an existing one-way valve can be directly installed on the movable assembly, but this will greatly increase the length of the movable component 21.

[0059] Based on the above embodiments, as Figure 8 、 9 shown, in a preferred embodiment of the present invention, the limiting member 33 is a rotating geometric body and / or the movable member 34 is a rotationally symmetric geometric body. The rotating geometric body is more evenly stressed during installation and will not have the situation of local stress concentration.

[0060] Based on the above embodiments, as Figure 8 、 9 shown, in a preferred embodiment of the present invention, the inflow channel 17 further includes a second flow channel 36 provided in the limiting member 33; the second flow channel 36 is used to connect the first flow channel 40 and the compression chamber 3. The end of the second flow channel 36 facing the compression chamber 3 gradually increases, forming a flared opening α of 15° to 25 degrees. Preferably, the flared opening of the second flow channel 36 is 20°;

[0061] Specifically, one end of the second flow channel 36 is flared, which can enable the fluid to quickly spread after entering the compression chamber 3, effectively avoiding the impact on the compression chamber 3 when the fluid enters the compression chamber 3, avoiding the vibration of the cavity assembly 1, and having good practical significance.

[0062] Based on the above embodiments, as Figure 8 and 9 shown, in a preferred embodiment of the present invention, the diameter of one end of the first flow channel 40 connected to the compression chamber 3 increases to accommodate the movable member 34. The movable member 34 has a gap 41 for communicating the first flow channel 40 and the compression chamber 3, and a sealing surface facing the first flow channel 40. The sealing surface can abut against the main body 35 to seal the first flow channel 40.

[0063] Specifically, at the end where the first flow channel 40 communicates with the compression chamber 3, the increased end diameter can form a funnel-shaped or cylindrical counterbore, and the present invention does not make specific limitations. When the movable member 34 moves in a direction away from the compression chamber 3, the movable member 34 can closely adhere to the side wall of the first flow channel 40 to seal the first flow channel 40. When the movable member 34 moves in the direction of the compression chamber 3, there is a gap for the fluid to flow through between the movable member 34 and the side surface of the first flow channel 40.

[0064] Preferably, in this embodiment, the movable member 34 has a plurality of first abutting portions 38 for abutting against the side wall of the first flow channel 40, and a plurality of second abutting portions 37 for abutting against the side wall of the second flow channel 36. Between two adjacent first abutting portions 38, and between two adjacent second abutting portions 37, there are formed a second flow channel 36 for communicating the first flow channel 40 and the fixing member 23, or a gap 41 for communicating the first flow channel 40 and the compression chamber 3.

[0065] Preferably, the movable member 34 has 4 first abutting portions 38 and 4 second abutting portions 37. The present invention does not make specific limitations on the number of the first abutting portions 38 and the second abutting portions 37. These solutions are all within the protection scope of the present invention and will not be elaborated here.

[0066] Specifically, the first abutting portion 38 can abut against the side wall of the first flow channel 40, and the second abutting portion 37 can abut against the side wall of the second flow channel 36. Either of them can enable the movable member 34 to move along the axis direction of the first flow channel 40 without being offset during the movement, causing unnecessary jamming, and having good practical significance.

[0067] In this embodiment, between two adjacent first abutting portions 38, and between two adjacent second abutting portions 37, there are inward depressions to form a gap 41 for communicating the first flow channel 40 and the second flow channel 36 or the compression chamber 3.

[0068] In other embodiments, the gap 41 may be an L-shaped hole provided in the movable member 34, and the L-shaped through hole is used to connect the side surface of the movable member 34 and the compression chamber 3.

[0069] Based on the above embodiments, as Figure 8 , 9 shown, in a preferred embodiment of the present invention, the limiting member 33 is embedded at one end of the first flow channel 40 connected to the compression chamber 3; in this embodiment, the limiting member 33 is directly press-fitted and clamped at the end of the first flow channel 40. In other embodiments, the limiting member 33 can be installed at the end of the first flow channel 40 by means of a buckle or the like.

[0070] Based on the above embodiments, as Figure 8 , 9 shown, in a preferred embodiment of the present invention, the sealing surface is the inclined end surface 39 at the end of the movable member 34.

[0071] The first flow channel 40 has an inclined surface adapted to the sealing surface.

[0072] Embodiment 2: Please refer to Figures 1 to 10 , the embodiment of the present invention provides a sealing structure for a direct-current pump, which can be applied to the direct-current pump as described in Embodiment 1.

[0073] The sealing structure includes: a cavity assembly 1, a movable assembly 21, and an inlet flow channel 17. The cavity assembly 1 includes a first cavity 24, a second cavity 26, and a sealing ring 25. The first cavity 24 has a cavity and an opening 5 and an outlet 22 communicating with the cavity. The second cavity 26 is embedded in the opening 5, and a sealing groove is formed between the second cavity 26 and the first cavity 24 on the side wall of the cavity. The sealing ring 25 is disposed in the sealing groove. The movable assembly 21 can movably pass through the second cavity 26 to divide the cavity into a compression chamber 3 and an activity chamber 4. The movable assembly 21 is configured to compress the fluid in the compression chamber 3 so that the fluid can flow out from the outlet 22. The inlet flow channel 17 passes through the movable assembly 21 and communicates with the compression chamber 3 for supplying external fluid into the compression chamber 3.

[0074] Specifically, by combining the first cavity 24 and the second cavity 26, a sealing groove is formed in the cavity.

[0075] First, during installation, the sealing ring 25 can be installed first and then the second cavity 26, making the installation of the sealing ring 25 more convenient and simple. Secondly, in terms of structure, the sealing groove is provided on the cavity assembly 1 instead of on the movable assembly 21, which can ensure that the surface of the movable assembly 21 is flat without any protrusions or depressions and has sufficient strength. Moreover, this structure enables the volume of the pump to be further reduced without worrying about insufficient strength of the piston. Thirdly, in terms of dimensions, the maximum diameter of the sealing groove is formed by the side wall of the cavity, making it easier to control the dimensions during the production of the first cavity 24 to ensure higher precision. The first cavity 24 and the second cavity 26 are combined to form a complete sealing groove, and the precision of the sealing groove can be ensured, guaranteeing the sealing performance, which has great practical significance. In this embodiment, the sealing ring 25 is an O-ring. In other embodiments, the sealing ring 25 can be a Y-ring. The present invention does not make specific limitations in this regard.

[0076] Based on the above embodiments, as Figure 5 、 6 、7 shown, in a preferred embodiment of the present invention, the sealing structure further includes a check valve. The check valve is disposed in the inlet passage 17.

[0077] Based on the above embodiments, as Figure 5 、 6 、7 shown, in a preferred embodiment of the present invention, the cavity assembly 1 further includes a non-return valve. The non-return valve is disposed at the outlet 22. Preferably, the non-return valve is a duckbill valve 2. External fluid can pass through the check valve and enter the compression chamber 3, and can flow outwards through the non-return valve.

[0078] Specifically, the movable assembly 21 can move from the compression chamber 3 to the activity chamber 4 to expand the compression chamber 3. A negative pressure is formed in the compression chamber 3, so that external fluid passes through the check valve and the inlet passage 17 and enters the compression chamber 3. The movable assembly 21 can move from the activity chamber 4 to the compression chamber 3 to compress the compression chamber 3. A positive pressure is formed in the compression chamber 3, so that the fluid inside the compression chamber 3 flows out from the outlet 22.

[0079] A check valve and a non-return valve are respectively provided in the inlet passage 17 and the outlet 22. It can be ensured that during the working process of the direct-flow pump, the fluid always flows from the inlet passage 17 to the compression chamber 3 and then flows out from the outlet 22. There will be no backflow at the inlet passage 17 and the outlet 22, greatly improving the working efficiency of the direct-flow pump, which has great practical significance.

[0080] Based on the above embodiments, as Figure 5 、 6 、7 shown, in a preferred embodiment of the present invention, the cavity assembly 1 further includes a fixing member 23 for fixing the non-return valve; the fixing member 23 has a flared mouth for sleeving the non-return valve.

[0081] Specifically, the fixing member 23 has a bell mouth for being placed on the check valve, so that the water flowing out of the check valve can be quickly diffused without forming a strong impact, thereby avoiding the vibration of the cavity assembly 1 and having good practical significance.

[0082] Based on the above embodiments, Figure 5 、 6 As shown in Figures 7 and 8, in a preferred embodiment of the present invention, the movable assembly 21 includes a sealing portion 16 located within the cavity and a connecting portion 20 extending outward through the second cavity 26. The diameter of the sealing portion 16 is larger than that of the connecting portion 20 to closely mate with the sealing ring 25. The sealing portion 16 can abut against the second cavity 26 to prevent it from falling out of the cavity.

[0083] Specifically, the portion of movable assembly 21 located within the chamber comprises a larger diameter sealing portion 16, which provides a sealed, sliding connection with the chamber's sidewalls. Extending outward from sealing portion 16 through outlet 22 is a connecting portion 20, which has a smaller diameter than sealing portion 16 and is used to connect to an external water source. The larger diameter of sealing portion 16 than connecting portion 20 allows movable member 34 to abut against second cavity 26 when moving toward expanding compression chamber 3, preventing it from disengaging from the chamber. This is highly practical.

[0084] Based on the above embodiments, Figure 3 、 7 As shown, in a preferred embodiment of the present invention, one of the first cavity 24 and the second cavity 26 is provided with a card slot 29, and the other is provided with a card protrusion 32 adapted to the card slot 29;

[0085] Optionally, in this embodiment, the inner wall of the first cavity 24 is provided with an annular retaining groove 29, and the outer wall of the second cavity 26 is provided with an annular protrusion, or retaining projection 32. During installation, the second cavity 26 is inserted into the opening 5 so that the retaining projection 32 engages with the retaining groove 29. This can greatly enhance the axial stability of the first cavity 24 and the second cavity 26 after they are mated.

[0086] In other embodiments, the locking groove may not be annular, but may be partially recessed, and may have multiple locking grooves, and the corresponding locking protrusion may not be annular, but may be partially protruded.

[0087] Based on the above embodiments, Figure 3 、 7 As shown, in a preferred embodiment of the present invention, one of the first cavity 24 and the second cavity 26 is provided with an external spline-shaped mounting portion 30 , and the other is provided with an internal spline-shaped fitting portion 31 adapted to the mounting portion 30 .

[0088] Specifically, in this embodiment, the fitting portion 31 is a plurality of grooves provided at the end of the opening 5 and recessed along the axis direction of the first cavity 24. And the plurality of grooves are evenly distributed in a circumferential manner. The second cavity 26 is provided with a plurality of protrusions adapted to the grooves. When installing, the second cavity 26 is inserted into the opening 5, so that the installation portion 30 is embedded in the fitting portion 31. It can greatly improve that the first cavity 24 and the second cavity 26 cannot rotate relative to each other after being fitted together.

[0089] On the basis of the above embodiment, in a preferred embodiment of the present invention, the first cavity 24 and the second cavity 26 are reinforced by welding. Preferably, ultrasonic welding is used.

[0090] On the basis of the above embodiment, as Figures 5 to 9 shown, in a preferred embodiment of the present invention, one of the side wall of the activity room 4 and the surface of the activity component 21 is provided with a linear groove 7, and the other is provided with a second protrusion 14 adapted to the linear groove 7; the linear groove 7 is arranged along the axis direction of the activity component 21. The second protrusion 14 is slidably arranged in the groove to limit the rotation of the activity component 21.

[0091] Specifically, the activity component 21 is used to compress the compression chamber 3, and its best structure is that both the cavity and the outer shape of the activity component 21 are cylindrical geometric bodies. This makes the assembly more convenient and the sealing effect better.

[0092] In order to ensure that the activity component 21 does not swing during the movement process. A linear groove 7 is provided on the side wall of the activity room 4, and the activity component 21 has a second protrusion 14 that can be embedded in the linear groove 7. The linear groove 7 is arranged along the movement direction of the activity component 21. The second protrusion 14 can slide in the linear groove 7 to make the activity component 21 slide more smoothly.

[0093] On the basis of the above embodiment, as Figure 3 、 5 、6 shown, in a preferred embodiment of the present invention, the driving component 19 can drive the activity component 21 to move a distance A in the direction of compressing the compression chamber 3. The length of the compression chamber 3 is B. The length of the sealing portion 16 is C. Wherein, 0.25(B - C) ≤ A ≤ 0.35(B - C).

[0094] The driving component 19 includes a circular wire helical spring located in the compression chamber 3. The circular wire helical spring is used to drive the activity component 21 to move in the direction of expanding the compression chamber 3. The original length of the circular wire helical spring is F. Wherein, 0.83F ≤ B - C ≤ 0.9F.

[0095] Specifically, 0.83F≤BC≤0.9F can ensure that the round coil spring has a pre-compression of 10% to 17%, ensuring that the movable component 21 can be driven to the end with each reset. 0.25(BC)≤A≤0.35(BC) can ensure that the compression of the round coil spring is maintained at 40% to 50%, which effectively guarantees the life of the round coil spring and has great practical significance.

[0096] Based on the above embodiments, Figure 3 、 5 As shown in FIG6 , in a preferred embodiment of the present invention, the maximum distance from the sealing ring 25 to the connection between the sealing portion 16 and the connecting portion 20 is D. The diameter of the compression chamber 3 is E. Wherein, BC=E, DA>1mm.

[0097] Specifically, DA > 1 mm ensures that the sealing portion 16 is always positioned on the movable assembly 21, thereby ensuring a good seal. BC = E ensures that the round coil spring has an appropriate diameter, ensuring sufficient elastic force to reset the movable assembly 21, while also preventing spring fatigue and extending the service life of the DC pump.

[0098] Preferably, in this embodiment: the compression distance A of the movable assembly 21 is 3.5 mm. The length B of the compression chamber 3 is 23 mm. The length C of the sealing portion 16 is 11.5 mm. The maximum distance D from the sealing ring 25 to the connection between the sealing portion 16 and the connecting portion 20 is 5 mm. The diameter E of the compression chamber 3 is 11.6 mm.

[0099] Example 3: Please refer to Figures 1 to 10 , an embodiment of the present invention provides a driving structure of a DC pump, which can be applied to the DC pump as described in Example 1.

[0100] The driving structure includes: a cavity component 1, a movable component 21, and a driving component 19. The cavity component 1 has a built-in cavity, an opening 5 and an outlet 22 connected to the cavity. The movable component 21 is movably located at the opening 5 to separate the cavity into a compression chamber 3 and a movable chamber 4. The movable component 21 is configured to compress the fluid in the compression chamber 3 so that the fluid can flow out from the outlet 22. The driving component 19 is transmission-connected to the movable component 21. The driving component 19 includes a driving gear 9 that is sleeved on the movable component 21. One of the driving gear 9 and the movable component 21 has a first protrusion 11, and the other has a mating portion that matches the first protrusion 11. The driving gear 9 can rotate relative to the movable component 21 so that the first protrusion 11 slides on the mating portion and drives the movable component 21 to compress the compression chamber 3.

[0101] Specifically, the drive gear 9 is mounted on the movable assembly 21. When the drive gear 9 rotates, the first protrusion 11 and the mating portion perform relative circular motion, thereby driving the movable assembly 21 to reciprocate relative to the cavity assembly 1 and repeatedly compress the compression chamber 3. The drive gear 9 drives the movable assembly 21 to reciprocate within the cavity assembly 1 and compress the compression chamber 3. This design avoids the traditional cam-crank mechanism. Therefore, when the drive gear 9 drives the movable assembly 21 to compress the compression chamber 3, there is no eccentricity, significantly reducing vibration and noise in the DC pump.

[0102] See also Figure 3 、 5 6. In this embodiment, the mating portion is a second protrusion 14 provided on the driving gear 9 and the other side of the movable assembly 21. The driving gear 9 can rotate so that the first protrusion 11 periodically contacts the second protrusion 14 and drives the movable assembly 21 to compress the compression chamber 3.

[0103] Specifically, the driving gear 9 is provided with a first protrusion 11, and the connecting portion 20 of the movable component 21 is provided with a second protrusion 14. During the rotation of the driving gear 9, the first protrusion 11 can push up the second protrusion 14, so that the movable component 21 moves away from the driving gear 9, that is, the movable component 21 compresses the compression chamber 3. It can be understood that a compression-type elastic member 18 is provided in the compression chamber 3, which is configured to drive the movable component 21 to move in the direction of expanding the compression chamber 3. It is used to drive the movable component 21 to reset when the first protrusion 11 and the second protrusion 14 are offset. Alternatively, a tensile elastic member 18 is provided between the driving gear 9 and the movable component 21 to drive the movable component 21 to reset.

[0104] It is understood that in other embodiments, the mating portion is an annular groove provided on the other side of the driving gear 9 and the movable assembly 21; the annular groove undulates along the axis of the movable assembly 21 or the driving gear 9. The driving gear 9 is capable of rotating so that the first protrusion 11 slides in the annular groove and drives the movable assembly 21 to compress the compression chamber 3.

[0105] Specifically, a full-circle annular groove is provided on the outer surface of the movable assembly 21, and a first protrusion 11 is provided on the drive gear 9, which is capable of extending into the annular groove. As the drive gear 9 rotates, the first protrusion 11 slides within the annular groove, driving the movable assembly 21 to continuously move closer to and farther from the drive gear 9. Since the drive gear 9 is stationary relative to the cavity assembly 1, the movable assembly 21 continuously moves closer to and farther from the cavity assembly 1, thereby compressing the compression chamber 3.

[0106] Based on the above embodiments, Figures 5 to 9As shown, in a preferred embodiment of the present invention, the drive structure further includes: an inlet flow channel 17 and a check valve. The inlet flow channel 17 passes through the movable assembly 21 and communicates with the compression chamber 3. The check valve is disposed in the inlet flow channel 17. External fluid can enter the compression chamber 3 through the inlet flow channel 17.

[0107] Specifically, the inlet flow channel 17 is provided on the movable assembly 21, so that the water inlet of the pump can extend substantially along the axial direction of the piston. There is no need to additionally form a water inlet on the pump body, that is, the water inlet pipeline does not extend outward from the side of the compression chamber 3. Thus, the radial volume of the piston pump is greatly reduced, and it can be installed in some places with relatively narrow installation spaces, which has good practical significance.

[0108] Based on the above embodiment, as Figures 5 to 9 shown, in a preferred embodiment of the present invention, one of the side wall of the activity chamber 4 and the surface of the movable assembly 21 is provided with a linear groove 7, and the other is provided with a second protrusion 14 adapted to the linear groove 7; the linear groove 7 is arranged along the axial direction of the movable assembly 21. The second protrusion 14 is slidably disposed in the groove to limit the rotation of the movable assembly 21. Among them, the check valve is disposed on the movable assembly 21. The opening 5, the movable assembly 21, the inlet flow channel 17, and the check valve are coaxially arranged.

[0109] Specifically, in order to ensure that the movable assembly 21 does not swing during the movement process. A linear groove 7 is provided on the side wall of the activity chamber 4, and the movable assembly 21 has a second protrusion 14 that can be embedded in the linear groove 7. The linear groove 7 is arranged along the movement direction of the movable assembly 21. The second protrusion 14 can slide in the linear groove 7 to make the movable assembly 21 slide more smoothly.

[0110] Based on the above embodiment, as Figure 5 、 6 shown, in a preferred embodiment of the present invention, the drive gear 9 has a pair of first protrusions 11. The pair of first protrusions 11 are connected in a ring shape and sleeved on the movable assembly 21. The first protrusion 11 has a first inclined surface 12 and a second inclined surface 10. The slope of the first inclined surface 12 is smaller than that of the second inclined surface 10. The second protrusion 14 has a third inclined surface 15 and a fourth inclined surface 13 corresponding to the first inclined surface 12 and the second inclined surface 10. Transition fillets are provided at the joints of the first inclined surface 12 and the second inclined surface 10, and at the joints of the third inclined surface 15 and the fourth inclined surface 13.

[0111] Specifically, the pair of first protrusions 11 are connected in a ring shape, which can enable the drive gear 9 to continuously change during rotation, and the settings of the first inclined surface 12 and the second inclined surface 10 can enable the movable assembly 21 to be slowly pressurized when compressing the compression chamber 3, ensuring sufficient driving force to drive the movable assembly 21. And quickly absorb water after compression is completed.

[0112] On the basis of the above embodiments, in a preferred embodiment of the present invention, both the first protrusion 11 and the second protrusion 14 extend along the axial direction of the movable component 21, so as to achieve a better meshing effect.

[0113] On the basis of the above embodiments, as Figure 5 , 6 shown, in a preferred embodiment of the present invention, the first protrusion 11 extends from the outside of the cavity component 1 through the opening 5 into the activity room 4. The cavity component 1 has a friction protrusion 6 located on the side wall of the opening 5 and used to abut against the outer surface of the first protrusion 11, so as to reduce the contact area between the cavity component 1 and the first protrusion 11.

[0114] Preferably, a plurality of hemispherical protrusions 44 are provided on the side surface of the driving gear 9, and the plurality of hemispherical protrusions 44 are evenly distributed circumferentially along the axis of the driving gear 9.

[0115] Specifically, providing a plurality of hemispherical protrusions 44 on the side surface of the driving gear 9 can effectively reduce the contact area between the driving gear 9 and the housing 43, and providing a friction protrusion 6 at the side wall of the opening 5 of the cavity component 1 can effectively reduce the contact area between the driving gear 9 and the cavity component 1, thereby reducing the friction force received by the driving gear 9, especially the maximum static friction force, ensuring the driving effect of the driving component 19, and greatly improving the energy conversion efficiency.

[0116] On the basis of the above embodiments, as Figure 2 , 3 shown, in a preferred embodiment of the present invention, the driving component 19 further includes a motor 46 drivingly connected to the driving gear 9. The motor 46 is a DC motor.

[0117] Embodiment 4: Please refer to Figures 1 to 10 , the embodiment of the present invention provides a flow channel structure of a DC pump, which can be applied to the DC pump as described in Embodiment 1.

[0118] The flow channel structure includes: a cavity component 1 and a movable component 21. The cavity component 1 has an internal cavity, as well as an opening 5 and an outlet 22 communicating with the internal cavity. The movable component 21 is movably located at the opening 5 and is used to divide the internal cavity into a compression chamber 3 and an activity room 4. The movable component 21 is configured to compress the fluid in the compression chamber 3 so that the fluid can flow out from the outlet 22. The movable component 21 is provided with a water flow channel for communicating the compression chamber 3 and the outside of the cavity component 1. The opening 5, the water flow channel, and the outlet 22 are coaxially arranged. One end of the water flow channel located outside the internal cavity is connected to an external water source through a hose. The water of the external water source can flow through the hose and the movable component 21 in sequence along the same direction to enter the compression chamber 3 and flow out from the outlet 22.

[0119] Specifically, by providing a water flow channel on the movable component 21, the piping on the side of the water pump can be reduced, thereby reducing the volume of the pump. The water flow channel is coaxially arranged with the opening 5 and the outlet 22, enabling the water to flow in the same direction when passing through the movable component 21, the compression chamber 3, and the outlet 22, significantly reducing the kinetic energy loss during the water flow and pressurization process.

[0120] It can be understood that since the hose is connected to a water source and the opening 5 is for discharging water, the water pressure in the hose is higher than that at the opening 5. When the movable component 21 moves towards the direction of expanding the compression chamber 3, even if no check valve or one-way valve is installed between the hose and the opening 5, the water will still flow from the hose into the compression chamber 3. Similarly, when the movable component 21 compresses the compression chamber 3, the water will flow from the compression chamber 3 to the opening 5. Therefore, this solution conforms to the laws of nature and is feasible.

[0121] Based on the above embodiments, as Figures 5 to 9 shown, in a preferred embodiment of the present invention, one of the side wall of the activity chamber 4 and the surface of the movable component 21 is provided with a linear groove 7, and the other is provided with a second protrusion 14 adapted to the linear groove 7; the linear groove 7 is arranged along the axial direction of the movable component 21. The second protrusion 14 is slidably configured in the groove to limit the rotation of the movable component 21. The activity chamber 4 has at least two linear grooves 7. The movable component 21 has at least two second protrusions 14. Preferably, the activity chamber 4 has 4 linear grooves 7. The movable component 21 has two second protrusions 14.

[0122] Specifically, to ensure that the movable component 21 does not swing during movement. A linear groove 7 is provided on the side wall of the activity chamber 4, and the movable component 21 has a second protrusion 14 that can be embedded in the linear groove 7. The linear groove 7 is arranged along the movement direction of the movable component 21. The second protrusion 14 can slide in the linear groove 7 to enable the movable component 21 to slide more smoothly.

[0123] Preferably, as Figure 3 、 5 shown, one of the side wall of the cavity and the surface of the movable component 21 is provided with a sealing groove. The cavity assembly 1 further includes a sealing ring 25 disposed in the sealing groove. The sealing ring 25 is sleeved on the movable component 21. Preferably, the sealing groove is provided on the side wall of the cavity and is disposed between the compression chamber 3 and the activity chamber 4;

[0124] Preferably, as Figures 5 to 9 shown, the movable component 21 has a sealing portion 16 located inside the opening 5 and a connecting portion 20 located outside the opening 5; the diameter of the sealing portion 16 is greater than that of the connecting portion 20; the diameter of the opening 5 is smaller than that of the sealing portion 16; the sealing portion 16 and the connecting portion 20 are coaxially arranged.

[0125] Specifically, the sealing portion 16 with a larger diameter can not only ensure the sealing effect with the sealing ring 25, but also the diameter of the sealing portion 16 is larger than that of the connecting portion 20, so that when the movable member 34 moves in the direction of expanding the compression chamber 3, it can abut against the second cavity 26 without detaching from the cavity, which has great practical significance.

[0126] On the basis of the above embodiments, as Figure 3 , 5 As shown in Figures 6 and 7, in a preferred embodiment of the present invention, the flow channel structure further includes a check valve disposed in the water flow channel. The cavity assembly 1 includes a check valve disposed at the outlet 22. Preferably, the check valve is a duckbill valve 2.

[0127] Specifically, the check valve disposed in the water flow channel and the check valve disposed at the outlet 22 can effectively prevent the fluid in the straight-through pump from flowing back, greatly improving the working efficiency of the straight-through pump, which has great practical significance.

[0128] On the basis of the above embodiments, as Figure 3 , 5 As shown in Figures 6, in a preferred embodiment of the present invention, the flow channel structure further includes an elastic member 18 located in the compression chamber 3 for driving the movable assembly 21 to move in the direction of expanding the compression chamber 3. Specifically, the elastic member 18 is a round wire helical spring.

[0129] Embodiment Five: Please refer to Figures 1 to 10 , the embodiment of the present invention provides a housing structure of a straight-through pump, which can be applied to the straight-through pump as described in Embodiment One.

[0130] The housing structure includes a housing assembly 42, a cavity assembly 1, a movable assembly 21, and a driving assembly 19.

[0131] The housing assembly 42 has a water outlet chamber 51, a water inlet chamber 55, and a power chamber 54. The cavity assembly 1 is disposed in the water outlet chamber 51. The cavity assembly 1 has a cavity and an opening 5 and an outlet 22 communicating with the cavity. The movable assembly 21 is movably located at the opening 5 and divides the cavity into a compression chamber 3 and an activity chamber 4. The driving assembly 19 is disposed in the power chamber 54 for driving the movable assembly 21 to reciprocate.

[0132] Specifically, by installing different components in different chambers of the housing assembly 42, the various components can be effectively combined into a whole by installing different components in different chambers, so that the various components are no longer fixed by bolts, not only the structure is more compact, but also it can effectively prevent the equipment from loosening during operation and reduce the vibration during operation, reducing the probability of damage.

[0133] On the basis of the above embodiments, as Figures 2 to 4As shown, in a preferred embodiment of the present invention, the housing assembly 42 is composed of a pair of housings 43; the pair of housings 43 are cooperated with each other to form a water outlet chamber 51, a water inlet chamber 55, and a power chamber 54. Specifically, the pair of housings 43 are substantially symmetrical, one of which is provided with a screw post 48 for fixing screws, and the other is provided with screw holes for screws to pass through. By combining the two housings 43 to fix the cavity assembly 1, the movable assembly 21, and the driving assembly 19, the installation is more convenient and the structure is more firm.

[0134] Based on the above embodiment, as Figures 2 to 4 shown, in a preferred embodiment of the present invention, the housing structure further includes a transmission chamber 47 communicating with the water outlet chamber 51, the water inlet chamber 55, and the power chamber 54. The driving assembly 19 includes a driving gear 9 and a motor 46; the driving gear 9 is disposed in the transmission chamber 47 and sleeved on the movable assembly 21; the motor 46 is disposed in the power chamber 54 and is drivingly connected to the driving gear 9. By installing the driving gear 9 through an independent transmission chamber 47, the driving gear 9 can be better fixed to prevent the driving gear 9 from loosening after long-term operation.

[0135] Preferably, the driving assembly 19 includes a power gear 45 disposed on the output shaft of the motor 46, and the power gear 45 is located in the transmission chamber 47 and is drivingly connected to the driving gear 9. Specifically, the thickness of the power gear 45 is greater than that of the driving gear 9; the transmission chamber 47 has a power groove 52 for accommodating the power gear 45. The thickness of the power gear 45 being greater than that of the driving gear 9 can better ensure the meshing effect between the power gear 45 and the driving gear 9. The transmission chamber 47 is used to install the driving gear 9, and its width just accommodates the driving gear 9, and a groove is provided at the position of the power gear 45 to accommodate the power gear 45.

[0136] Preferably, a plurality of hemispherical protrusions 44 are provided on the side surface of the driving gear 9; the plurality of hemispherical protrusions 44 are circumferentially and evenly distributed along the axis of the driving gear 9. Specifically, providing a plurality of hemispherical protrusions 44 on the side surface of the driving gear 9 can effectively reduce the contact area between the driving gear 9 and the housing 43, thereby reducing the friction force received by the driving gear 9, especially the maximum static friction force, ensuring the driving effect of the driving assembly 19, and greatly improving the energy conversion efficiency.

[0137] Based on the above embodiment, as Figures 2 to 4 shown, in a preferred embodiment of the present invention, the cavity assembly 1 includes a check valve located at the outlet 22 and a fixing member 23 for fixing the check valve; a fixing groove 27 is provided on the outer side wall of the fixing member 23. The housing 43 has a fixing protrusion 49 adapted to the fixing groove 27. Specifically, the check valve can prevent fluid from flowing back and refluxing, greatly improving the efficiency of the direct current valve. By fixing the fixing member 23 for fixing the check valve through the fixing protrusion 49, the efficiency of assembling the direct current valve can be greatly improved.

[0138] Based on the above embodiments, as Figures 2 to 4 shown, in a preferred embodiment of the present invention, the housing assembly 42 has a notch 53 communicating with the power chamber 54 for enabling the motor 46 to be electrically connected to an external power source.

[0139] Based on the above embodiments, as Figures 2 to 4 shown, in a preferred embodiment of the present invention, the cavity assembly 1 and the movable assembly 21 are rotating geometric bodies. One of the outer wall of the cavity assembly 1 and the inner wall of the water outlet chamber 51 is provided with a rib 28, and the other is provided with a rib groove 50 for fixing the rib 28. Specifically, the fixing by the structure of the rib 28 and the rib groove 50 is not only simple in structure but also reliable in fixing effect. By combining a pair of shells 43 to enclose the cavity assembly 1, it can not only be effectively fixed from all directions but also be simple to install.

[0140] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sealing structure for a direct-current pump, characterized in that Comprising: A cavity assembly (1), including a first cavity (24), a second cavity (26), and a sealing ring (25); the first cavity (24) has a cavity, as well as an opening (5) and an outlet (22) communicating with the cavity; the second cavity (26) is embedded in the opening (5), and a sealing groove is formed between the second cavity (26) and the first cavity (24) on the side wall of the cavity; the sealing ring (25) is disposed in the sealing groove; A movable assembly (21), which can movably pass through the second cavity (26) to divide the cavity into a compression chamber (3) and an activity chamber (4); the movable assembly (21) is configured to compress the fluid in the compression chamber (3) so that the fluid can flow out from the opening (5); the movable assembly (21) has a sealing portion (16) located in the cavity and a connecting portion (20) extending outward through the second cavity (26). An inflow channel (17), passing through the movable assembly (21) and communicating with the compression chamber (3); for supplying external fluid into the compression chamber (3). A driving assembly (19), for driving the movable assembly (21) to move a distance A in the direction of compressing the compression chamber (3); the length of the compression chamber (3) is B; the length of the sealing portion (16) is C; wherein, 0.25(B - C) ≤ A ≤ 0.35(B - C). The driving assembly (19) includes a round wire helical spring located in the compression chamber (3); the round wire helical spring is used to drive the movable assembly (21) to move in the direction of expanding the compression chamber (3); the original length of the round wire helical spring is F; wherein, 0.83F ≤ B - C ≤ 0.9F. The maximum distance from the sealing ring (25) to the connection point of the sealing portion (16) and the connecting portion (20) is D; D - A > 1 mm. The diameter of the compression chamber (3) is E; wherein, B - C = E. The movable assembly (21), the inflow channel (17), and the opening (5) are coaxially arranged. The diameter of the sealing portion (16) is larger than that of the connecting portion (20) to closely cooperate with the sealing ring (25); the sealing portion (16) can abut against the second cavity (26) to prevent it from coming out of the cavity. One of the first cavity (24) and the second cavity (26) is provided with a card slot (29), and the other is provided with a card projection (32) adapted to the card slot (29); the card slot (29) and the card projection (32) are annular. One of the first cavity (24) and the second cavity (26) is provided with an external spline-shaped mounting portion (30), and the other is provided with an internal spline-shaped fitting portion (31) adapted to the mounting portion (30). One of the side walls of the activity room (4) and the surface of the activity component (21) is provided with a linear groove (7), and the other is provided with a second protrusion (14) adapted to the linear groove (7); the linear groove (7) is arranged along the axial direction of the activity component (21); the second protrusion (14) is slidably disposed in the groove to limit the rotation of the activity component (21).

2. The sealing structure according to claim 1, wherein the sealing structure further comprises a check valve; the check valve is disposed in the inflow channel (17); the cavity assembly (1) further comprises a check valve; the check valve is disposed at the outlet (22); External fluid can pass through the check valve into the compression chamber (3) and can flow outwards through the check valve.

3. The sealing structure according to claim 2, wherein, Further comprising the cavity assembly (1) further includes a fixing member (23) for fixing the check valve; the fixing member (23) has a flared mouth for sleeving the check valve; the check valve is a duckbill valve (2).

4. The sealing structure according to any one of claims 1-3, wherein the first cavity (24) and the second cavity (26) are fixedly welded; the sealing ring (25) is an O-ring or a Y-ring.

Images