A DC pump

Abstract

The present invention provides a direct current pump, which relates to the field of pump technology. It comprises: a cavity assembly with a built-in accommodating cavity and an opening and an outlet connected to the accommodating cavity; a movable assembly movably located at the opening to separate the accommodating cavity into a compression chamber and an active chamber; an inlet channel passing through the movable assembly and connected to the compression chamber; and a one-way valve arranged in the inlet channel. The movable assembly is configured to compress the fluid in the compression chamber so that the fluid can flow out from the outlet. External fluid can enter the compression chamber through the inlet channel. The inlet channel is arranged on the movable assembly so that the water inlet of the pump can extend along the axial direction of the piston instead of extending outward from the side of the compression chamber, which greatly reduces the radial volume of the piston pump and has good practical significance.

Description

Technical Field

[0001] The present invention relates to the field of pumps, and in particular to a direct current pump. Background Art

[0002] With the development of technology, water-using devices such as water flossers and water dispensers have been used in people's lives, bringing great convenience to people's lives. These water-using devices all require the installation of water pumps. Among them, piston pumps are the most commonly used.

[0003] The axis of the water inlet of a traditional piston pump forms a certain angle with the axis of the piston, which makes the pump larger and inconvenient to use and install. Summary of the Invention

[0004] The present invention provides a direct current pump, aiming to improve the problem of large volume of a traditional piston pump.

[0005] In order to solve the above technical problems, the present invention provides a DC pump, comprising:

[0006] A cavity assembly having a built-in cavity, and an opening and an outlet connected to the cavity;

[0007] a movable component movably located at the opening to separate the chamber into a compression chamber and an active chamber; the movable component is configured to compress the fluid in the compression chamber so that the fluid can flow out from the outlet;

[0008] an inlet channel passing through the movable assembly and communicating with the compression chamber;

[0009] a one-way valve, disposed in the inlet channel;

[0010] External fluid can enter the compression chamber through the inlet channel.

[0011] Optionally,

[0012] The movable component, the inlet channel, and the opening are coaxially arranged.

[0013] Optionally,

[0014] The one-way valve is located in the movable assembly.

[0015] Optionally,

[0016] One of the side wall of the movable chamber and the surface of the movable 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 provided along the axis direction of the movable component;

[0017] The second protrusion is slidably disposed in the groove to limit the rotation of the movable component.

[0018] Optionally,

[0019] The movable assembly includes a main body that is movable and located at the opening;

[0020] The inlet channel includes a first flow channel provided in the main body;

[0021] The one-way valve includes a movable member movably disposed in the first flow channel, and a limiting member for preventing the movable member from escaping from the first flow channel;

[0022] The movable member can abut against the main body to seal the first flow channel; and abut against the limiting member to connect the first flow channel to the compression chamber.

[0023] Optionally,

[0024] The diameter of one end of the first flow channel connected to the compression chamber is increased to accommodate the movable part;

[0025] The movable member has a gap for connecting the first flow channel and the compression chamber, and a sealing surface facing the first flow channel;

[0026] The sealing surface can abut against the main body to seal the first flow channel.

[0027] Optionally,

[0028] The limiting member is a rotating geometric body;

[0029] The limiting member is embedded in one end of the first flow channel connected to the compression chamber;

[0030] The inlet channel also includes a second flow channel arranged on the limiter; the second flow channel is used to connect the first flow channel and the compression chamber; the second flow channel gradually increases toward one end of the compression chamber, forming a bell mouth α of 15° to 25 degrees.

[0031] Optionally,

[0032] The movable member has a plurality of first abutting portions for abutting against the side wall of the first flow channel, and a plurality of second abutting portions for abutting against the side wall of the second flow channel;

[0033] Between two adjacent first abutting portions and between two adjacent second abutting portions, gaps are formed facing each other for communicating the first flow channel with the second flow channel.

[0034] Optionally,

[0035] The flare of the second flow channel is 20°;

[0036] The movable member has four first abutting portions and four second abutting portions.

[0037] Optionally,

[0038] The movable part is a rotationally symmetrical geometric body;

[0039] The sealing surface is an inclined end surface of the end of the movable part;

[0040] The first flow channel has an inclined surface adapted to the sealing surface.

[0041] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0042] The inlet channel is arranged on the movable component so that the water inlet of the pump can extend along the axial direction of the piston instead of extending outward from the side of the compression chamber, which greatly reduces the radial volume of the piston pump and has great practical significance.

[0043] The inlet channel cavity component comprises a cavity and an opening and an outlet respectively communicating with the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 This is the first axonometric drawing of a DC pump;

[0046] Figure 2 This is the second axonometric view of the DC pump (half of the casing is hidden for ease of display);

[0047] Figure 3 This is the third isometric view of the DC pump (half of the housing and half of the chamber components are hidden for ease of display);

[0048] Figure 4 It is an axonometric drawing of the shell;

[0049] Figure 5 This is the axonometric drawing of the cavity assembly, movable assembly, and drive assembly when they are in coordination (for ease of display, half of the cavity assembly is hidden);

[0050] Figure 6 This is an exploded view of the cavity assembly, active assembly, and drive assembly (half of the cavity assembly is hidden for ease of display);

[0051] Figure 7This is an exploded view of the cavity assembly (some features of the components are hidden for ease of display);

[0052] Figure 8 It is an exploded view of the active component (some features of the components are hidden for ease of display);

[0053] Figure 9 It is a half-section view of the active component;

[0054] Figure 10 This is the axonometric view of the drive gear (some features of the components are hidden for ease of display).

[0055] Markings in the figure: 1- chamber assembly; 2- duckbill valve; 3- compression chamber; 4- movable 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 portion; 17- inlet channel; 18- elastic member; 19- driving assembly; 20- connecting portion; 21- movable assembly; 22- outlet; 23- fixing member; 24- first chamber; 25- sealing ring; 26- second chamber; 27- fixing groove; 28- rib 1-water outlet chamber; 52-power slot; 53-notch; 54-power chamber; 55-water inlet chamber. DETAILED DESCRIPTION

[0056] In order 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 drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection 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 invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0058] Example 1: Please refer to Figures 1 to 10 An embodiment of the present invention provides a DC pump, comprising: a cavity component 1, a movable component 21, an inlet channel 17, and a one-way valve.

[0059] The chamber assembly 1 includes a chamber, an opening 5, and an outlet 22 connected to the chamber. A movable assembly 21 is movably positioned within the opening 5 to separate the chamber into a compression chamber 3 and an active chamber 4. An inlet passage 17 passes through the movable assembly 21 and is connected to the compression chamber 3. A one-way valve is disposed within the inlet passage 17. External fluid can enter the compression chamber 3 through the inlet passage 17, and the movable assembly 21 is configured to compress the fluid within the compression chamber 3, allowing the fluid to flow out through the outlet 22.

[0060] Specifically, the movable assembly 21 can move from the compression chamber 3 toward the movable chamber 4 to expand the compression chamber 3. A negative pressure is formed within the compression chamber 3, allowing external fluid to enter the compression chamber 3 through the one-way valve and the inlet channel 17. The movable assembly 21 can move from the movable chamber 4 toward the compression chamber 3 to compress the compression chamber 3. A positive pressure is formed within the compression chamber 3, causing the fluid within the compression chamber 3 to flow out through the outlet 22.

[0061] By positioning the inlet channel 17 on the movable assembly 21, the pump's water inlet extends roughly along the axial direction of the piston. This eliminates the need for a separate water inlet on the pump body, and the water inlet line no longer extends outward from the side of the compression chamber 3. This significantly reduces the radial volume of the piston pump, enabling installation in confined spaces, a significant practical advantage.

[0062] In this embodiment, the external fluid can be liquid or gas. The inlet channel 17 is a channel for the fluid to flow through.

[0063] Based on the above embodiments, Figures 5 to 9 As shown, in a preferred embodiment of the present invention, one of the sidewall of the movable 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 fit the linear groove 7; the linear groove 7 is provided along the axis of the movable assembly 21. The second protrusion 14 is slidably disposed in the groove to restrict the rotation of the movable assembly 21.

[0064] Specifically, the movable component 21 is used to compress the compression chamber 3, and the best structure is that the cavity and the movable component 21 are both cylindrical in shape, which makes assembly easier and has a better sealing effect.

[0065] To prevent the movable assembly 21 from swinging during movement, a linear groove 7 is provided on the sidewall of the movable chamber 4. The movable assembly 21 has a second protrusion 14 that fits into the linear groove 7. The linear groove 7 is arranged along the direction of movement of the movable assembly 21. The second protrusion 14 can slide within the linear groove 7, allowing the movable assembly 21 to slide more smoothly.

[0066] In this embodiment, there are four linear grooves 7 and two second protrusions 14, allowing for faster installation into the linear grooves 7 during assembly. It is understood that in other embodiments, the linear grooves 7 may be any number greater than two, as long as they are evenly distributed along the circumference of the axis of the active chamber 4. Similarly, the second protrusions 14 may be any number other than two, as long as they are evenly distributed along the circumference of the axis of the active chamber 4. The number of linear grooves 7 and second protrusions 14 is not specifically limited herein.

[0067] Based on the above embodiments, Figures 5 to 9 As shown, in a preferred embodiment of the present invention, the movable component 21, the inlet channel 17, and the opening 5 are coaxially arranged.

[0068] Specifically, the portion of inlet channel 17 located within movable assembly 21 is positioned along the axis of movable assembly 21, and opening 5 is positioned directly opposite movable assembly 21, so that movable assembly 21, inlet channel 17, and opening 5 are coaxially arranged. This ensures that the fluid's flow direction remains unchanged throughout the entire process of passing through inlet channel 17, entering compression chamber 3, and being ejected from outlet 22. This minimizes kinetic energy loss and significantly improves the efficiency of the DC pump.

[0069] It is understood that in other embodiments, the inlet channel 17 can be positioned arbitrarily on the movable assembly 21, need not be positioned at the axis of the movable assembly 21, and can be parallel to or non-parallel to the axis of the movable assembly 21. It only needs to pass through the movable assembly 21 and communicate with the compression chamber 3. The present invention is not specifically limited to this.

[0070] Based on the above embodiments, Figure 8 、 9 As shown, in a preferred embodiment of the present invention, the one-way valve is located in the movable component 21.

[0071] Specifically, a one-way valve is provided on inlet channel 17 to effectively prevent fluid backflow when movable assembly 21 compresses compression chamber 3. This ensures that during each compression, the entire fluid within compression chamber 3 flows toward outlet 22. Placing the one-way valve on movable assembly 21 significantly improves the integration of the DC pump, reduces the number of external components, and simplifies installation.

[0072] It is understandable that in other embodiments, the one-way valve can be installed at any position of the inlet channel 17 outside the movable component 21, which can also play the same role. In addition, a ready-made one-way valve can be purchased at a lower cost.

[0073] Based on the above embodiments, Figure 8 、 9 As shown, in a preferred embodiment of the present invention, movable assembly 21 includes a main body 35 that is movable within opening 5. Inlet channel 17 includes a first flow channel 40 disposed within main body 35. The one-way valve includes a movable member 34 that is movable within first flow channel 40, and a stopper 33 for preventing movable member 34 from dislodging from first flow channel 40. Movable member 34 can abut main body 35 to seal first flow channel 40, and abuts stopper 33 to connect first flow channel 40 to compression chamber 3.

[0074] Specifically, the outer surface of the main body 35 is in sealing and sliding connection with the side wall of the accommodating cavity to prevent the fluid inside the compression chamber 3 from leaking into the active chamber 4 .

[0075] The inlet channel 17 includes a first flow channel 40 that passes through the main body 35. A movable member 34 is installed in the first flow channel 40. A stopper 33 is installed at the end of the first flow channel 40 on the side connected to the compression chamber 3 to prevent the movable member 34 from disengaging from the first flow channel 40.

[0076] When the movable member 34 moves toward the compression chamber 3, it connects the first flow channel 40 with the compression chamber 3. When the movable member 34 moves away from the compression chamber 3, it blocks the first flow channel 40, separating the first flow channel 40 from the compression chamber 3, forming a specialized one-way valve structure. When the movable member 34 moves toward the compression chamber 3, an L-shaped through-hole can be provided on the movable member 34 to connect the side of the movable member 34 with the compression chamber 3, or a through-hole for fluid to pass through can be provided on the stop member 33.

[0077] In other embodiments, an existing one-way valve may be directly installed on the movable assembly, but the length of the movable assembly 21 will be greatly lengthened.

[0078] Based on the above embodiments, Figure 8 、 9 As 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 symmetrical geometric body. The rotating geometric body is subjected to more uniform force during installation, and local stress concentration will not occur.

[0079] Based on the above embodiments, Figure 8 、 9As shown, in a preferred embodiment of the present invention, the inlet channel 17 further includes a second flow channel 36 disposed on the stopper 33; the second flow channel 36 is used to connect the first flow channel 40 and the compression chamber 3. The second flow channel 36 gradually widens toward one end of the compression chamber 3, forming a bell mouth α with an angle of 15° to 25°. Preferably, the bell mouth of the second flow channel 36 is 20°.

[0080] Specifically, one end of the second flow channel 36 is in the shape of a bell mouth, which enables the fluid to diffuse rapidly after entering the compression chamber 3, effectively avoiding the impact of the fluid on the compression chamber 3 after entering the compression chamber 3, and avoiding the vibration of the cavity assembly 1, which has great practical significance.

[0081] Based on the above embodiments, Figure 8 、 9 As shown, in a preferred embodiment of the present invention, the diameter of the end of the first flow channel 40 connected to the compression chamber 3 is increased to accommodate the movable member 34. The movable member 34 has a gap 41 for connecting the first flow channel 40 and the compression chamber 3, and a sealing surface facing the interior of the first flow channel 40. The sealing surface can abut against the main body 35 to seal the first flow channel 40.

[0082] Specifically, the first flow channel 40 communicates with one end of the compression chamber 3. The increased diameter of the end can form a funnel or cylindrical countersunk hole, which is not specifically limited in the present invention. When the movable member 34 moves away from the compression chamber 3, it can abut against the sidewall of the first flow channel 40, sealing the first flow channel 40. When the movable member 34 moves toward the compression chamber 3, a gap is formed between the movable member 34 and the side of the first flow channel 40, allowing fluid to flow through.

[0083] Preferably, in this embodiment, the movable member 34 has a plurality of first abutting portions 38 for abutting against the sidewall of the first flow channel 40, and a plurality of second abutting portions 37 for abutting against the sidewall of the second flow channel 36. Between two adjacent first abutting portions 38, and between two adjacent second abutting portions 37, a gap 41 is formed opposite to each other, for connecting the first flow channel 40 and the fixed member 23, or between the first flow channel 40 and the compression chamber 3.

[0084] Preferably, the movable member 34 has four first abutting portions 38 and four second abutting portions 37. The present invention does not specifically limit the number of the first abutting portions 38 and the second abutting portions 37. These solutions are all within the scope of protection of the present invention and will not be described in detail here.

[0085] Specifically, the first abutment portion 38 can abut against the side wall of the first flow channel 40, and the second abutment portion 37 can abut against the side wall of the second flow channel 36. Either of them can enable the movable part 34 to move along the axial direction of the first flow channel 40 without being offset during the movement, causing unnecessary jamming, which has great practical significance.

[0086] In this embodiment, the space between two adjacent first abutting portions 38 and the space between two adjacent second abutting portions 37 are recessed inward to form a gap 41 for connecting the first flow channel 40 and the second flow channel 36 or the compression chamber 3 .

[0087] 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 .

[0088] Based on the above embodiments, Figure 8 、 9 As shown, in a preferred embodiment of the present invention, the limit member 33 is embedded in the first flow channel 40 and connected to one end of the compression chamber 3; in this embodiment, the limit member 33 is directly interference fit and clamped in the end of the first flow channel 40. In other embodiments, the limit member 33 can be installed at the end of the first flow channel 40 by means of a snap or the like.

[0089] Based on the above embodiments, Figure 8 、 9 As 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.

[0090] The first flow channel 40 has an inclined surface adapted to the sealing surface.

[0091] Example 2: Please refer to Figures 1 to 10 , an embodiment of the present invention provides a sealing structure of a DC pump, which can be applied to the DC pump as described in Example 1.

[0092] The sealing structure includes: a cavity assembly 1, a movable assembly 21, and an inlet 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 accommodating cavity, and an opening 5 and an outlet 22 connected to the accommodating cavity. The second cavity 26 is embedded in the opening 5, and a sealing groove located on the side wall of the accommodating cavity is formed between the second cavity 26 and the first cavity 24. The sealing ring 25 is arranged in the sealing groove. The movable assembly 21 can movably pass through the second cavity 26 to separate the accommodating cavity into a compression chamber 3 and an movable 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 channel 17 passes through the movable assembly 21 and is connected to the compression chamber 3. It is used to allow external fluid to enter the compression chamber 3.

[0093] Specifically, a sealing groove is formed in the cavity by combining the first cavity 24 and the second cavity 26 .

[0094] 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, structurally, the sealing groove is set on the cavity component 1, rather than on the movable component 21, which can ensure that the surface of the movable component 21 is flat without any protrusions or depressions and has sufficient strength. In addition, this structure allows the volume of the pump to be further reduced without worrying about the insufficient strength of the piston. Thirdly, in terms of size, the maximum diameter of the sealing groove is formed by the side wall of the cavity, which makes it easier to control the size when producing the first cavity 24 to ensure higher precision. A complete sealing groove is formed by combining the first cavity 24 and the second cavity 26, and the accuracy of the sealing groove and the sealing performance can be guaranteed, which has great practical significance. In this embodiment, the sealing ring 25 is an O-ring. In other embodiments, the sealing ring 25 can adopt a Y-ring, which is not specifically limited by the present invention.

[0095] Based on the above embodiments, Figure 5 、 6 As shown in FIG. 7 , in a preferred embodiment of the present invention, the sealing structure further comprises a one-way valve. The one-way valve is disposed in the inlet channel 17 .

[0096] Based on the above embodiments, Figure 5 、 6 As shown in Figures 7 and 8, in a preferred embodiment of the present invention, the chamber assembly 1 further includes a check valve. The check valve is disposed at the outlet 22. Preferably, the check valve is a duckbill valve 2. External fluid can enter the compression chamber 3 through the one-way valve and can flow out through the check valve.

[0097] Specifically, the movable assembly 21 can move from the compression chamber 3 toward the movable chamber 4 to expand the compression chamber 3. A negative pressure is formed within the compression chamber 3, allowing external fluid to enter the compression chamber 3 through the one-way valve and the inlet channel 17. The movable assembly 21 can move from the movable chamber 4 toward the compression chamber 3 to compress the compression chamber 3. A positive pressure is formed within the compression chamber 3, causing the fluid within the compression chamber 3 to flow out through the outlet 22.

[0098] A one-way valve and a check valve are installed in the inlet channel 17 and outlet 22, respectively. This ensures that during operation, the fluid always flows from the inlet channel 17 to the compression chamber 3 and then out through the outlet 22. Backflow is prevented at either the inlet channel 17 or the outlet 22, significantly improving the efficiency of the DC pump and providing excellent practical benefits.

[0099] Based on the above embodiments, Figure 5 、 6 As shown in Figures 7 and 7, in a preferred embodiment of the present invention, the cavity assembly 1 further includes a fixing member 23 for fixing the check valve; the fixing member 23 has a bell mouth for being placed on the check valve.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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 locking groove 29, and the other is provided with a locking protrusion 32 adapted to the limiting groove;

[0104] 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.

[0105] 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.

[0106] 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 .

[0107] Specifically, in this embodiment, the interlocking portion 31 is provided at the end of the opening 5 and is recessed along the axis of the first cavity 24. The grooves are evenly distributed around the circumference. The second cavity 26 is provided with multiple protrusions that match the grooves. During installation, the second cavity 26 is inserted into the opening 5 so that the mounting portion 30 is embedded in the interlocking portion 31. This can greatly improve the ability of the first cavity 24 and the second cavity 26 to prevent relative rotation after mating.

[0108] Based on 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.

[0109] Based on the above embodiments, Figures 5 to 9 As shown, in a preferred embodiment of the present invention, one of the sidewall of the movable 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 fit the linear groove 7; the linear groove 7 is provided along the axis of the movable assembly 21. The second protrusion 14 is slidably disposed in the groove to restrict the rotation of the movable assembly 21.

[0110] Specifically, the movable component 21 is used to compress the compression chamber 3, and the best structure is that the cavity and the movable component 21 are both cylindrical in shape, which makes assembly easier and has a better sealing effect.

[0111] To prevent the movable assembly 21 from swinging during movement, a linear groove 7 is provided on the sidewall of the movable chamber 4. The movable assembly 21 has a second protrusion 14 that fits into the linear groove 7. The linear groove 7 is arranged along the direction of movement of the movable assembly 21. The second protrusion 14 can slide within the linear groove 7, allowing the movable assembly 21 to slide more smoothly.

[0112] Based on the above embodiments, Figure 3 、 5 As shown in FIG6 , in a preferred embodiment of the present invention, the driving assembly 19 is capable of driving the movable assembly 21 to move a distance A in a 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. Here, 0.25(BC)≤A≤0.35(BC).

[0113] The drive assembly 19 includes a coil spring located in the compression chamber 3. The coil spring is used to drive the movable assembly 21 to move in a direction to expand the compression chamber 3. The original length of the coil spring is F, where 0.83F≤BC≤0.9F.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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 channel 17 and a one-way valve. Inlet channel 17 passes through movable assembly 21 and communicates with compression chamber 3. The one-way valve is disposed in inlet channel 17. External fluid can enter compression chamber 3 through inlet channel 17.

[0126] Specifically, positioning the inlet channel 17 on the movable assembly 21 allows the pump's water inlet to extend roughly along the axial direction of the piston. This eliminates the need for a separate water inlet on the pump body, and the water inlet line no longer extends outward from the side of the compression chamber 3. This significantly reduces the radial volume of the piston pump, enabling installation in confined spaces, a significant practical advantage.

[0127] Based on the above embodiments, Figures 5 to 9 As shown, in a preferred embodiment of the present invention, a linear groove 7 is provided on one of the sidewall of the movable chamber 4 and the surface of the movable assembly 21, and a second protrusion 14 is provided on the other side to mate with the linear groove 7. The linear groove 7 is arranged along the axis of the movable assembly 21. The second protrusion 14 is slidably disposed in the groove to restrict the rotation of the movable assembly 21. A one-way valve is provided on the movable assembly 21. The opening 5, the movable assembly 21, the inlet channel 17, and the one-way valve are coaxially arranged.

[0128] Specifically, to ensure that the movable assembly 21 does not swing during movement, a linear groove 7 is provided on the side wall of the movable chamber 4, and the movable assembly 21 has a second protrusion 14 that can fit into the linear groove 7. The linear groove 7 is provided along the direction of movement of the movable assembly 21. The second protrusion 14 can slide within the linear groove 7, allowing the movable assembly 21 to slide more smoothly.

[0129] Based on the above embodiments, Figure 5 、 6 As shown, in a preferred embodiment of the present invention, the driving gear 9 has a pair of first protrusions 11. The pair of first protrusions 11 are connected in a ring shape and are sleeved on the movable component 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. The connection between the first inclined surface 12 and the second inclined surface 10, as well as the connection between the third inclined surface 15 and the fourth inclined surface 13, are both provided with transition fillets.

[0130] Specifically, the pair of first protrusions 11 are connected in a ring shape, which enables the movable assembly 21 to continuously change during the rotation of the driving gear 9. The arrangement of the first inclined surface 12 and the second inclined surface 10 enables the movable assembly 21 to slowly pressurize the compression chamber 3 when compressing the compression chamber 3, ensuring sufficient driving force to drive the movable assembly 21. After compression, the movable assembly 21 can quickly absorb water.

[0131] On the basis of the above embodiment, in a preferred embodiment of the present invention, the first protrusion 11 and the second protrusion 14 both extend along the axis direction of the movable component 21, so as to achieve a better meshing effect.

[0132] Based on the above embodiments, Figure 5 、 6 As shown, in a preferred embodiment of the present invention, first protrusion 11 extends from the outside of cavity assembly 1 through opening 5 into active chamber 4. Cavity assembly 1 has friction protrusion 6 located on the sidewall of opening 5 and configured to abut the outer surface of first protrusion 11, thereby reducing the contact area between cavity assembly 1 and first protrusion 11.

[0133] 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 evenly distributed along the circumference of the axis of the driving gear 9 .

[0134] Specifically, providing multiple hemispherical protrusions 44 on the side of the driving gear 9 can effectively reduce the contact area between the driving gear 9 and the shell 43, and providing friction protrusions 6 on the side wall of the cavity assembly 1 located at the opening 5 can effectively reduce the contact area between the driving gear 9 and the cavity assembly 1, thereby reducing the friction force exerted on 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.

[0135] Based on the above embodiments, Figure 2 、 3 As shown, in a preferred embodiment of the present invention, the driving assembly 19 further includes a motor 46 drivingly connected to the driving gear 9. The motor 46 is a DC motor.

[0136] Example 4: Please refer to Figures 1 to 10 , an 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 Example 1.

[0137] The flow channel structure includes: a cavity component 1 and a movable component 21. 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 movable component 21 is provided with a water flow channel for connecting 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 outside the cavity is connected to an external water source through a hose. Water from the external water source can flow through the hose and the movable component 21 in the same direction in sequence to enter the compression chamber 3 and flow out from the outlet 22.

[0138] Specifically, providing a water flow channel on movable assembly 21 reduces the number of pipes located on the side of the water pump, thereby reducing the pump's volume. The water flow channel is coaxial with opening 5 and outlet 22, ensuring that water flows in the same direction as it flows through movable assembly 21, compression chamber 3, and outlet 22, significantly reducing kinetic energy loss during the water's flow and pressurization process.

[0139] Understandably, because the hose is connected to a water source and opening 5 is used to discharge water, the water pressure within the hose is greater than the water pressure at opening 5. Therefore, when movable assembly 21 moves toward expanding compression chamber 3, even if no check valve or one-way valve is installed between the hose and opening 5, water will still flow from the hose into compression chamber 3. Similarly, when movable assembly 21 compresses compression chamber 3, water will flow from compression chamber 3 to opening 5. Therefore, this solution conforms to natural laws and is feasible.

[0140] Based on the above embodiments, Figures 5 to 9 As shown, in a preferred embodiment of the present invention, one of the sidewall of the movable 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 that matches the linear groove 7; the linear groove 7 is arranged along the axis of the movable assembly 21. The second protrusion 14 is slidably configured in the groove to limit the rotation of the movable assembly 21. The movable chamber 4 has at least two linear grooves 7. The movable assembly 21 has at least two second protrusions 14. Preferably, the movable chamber 4 has four linear grooves 7. The movable assembly 21 has two second protrusions 14.

[0141] Specifically, to ensure that the movable assembly 21 does not swing during movement, a linear groove 7 is provided on the side wall of the movable chamber 4, and the movable assembly 21 has a second protrusion 14 that can fit into the linear groove 7. The linear groove 7 is provided along the direction of movement of the movable assembly 21. The second protrusion 14 can slide within the linear groove 7, allowing the movable assembly 21 to slide more smoothly.

[0142] Preferably, if Figure 3 、 5 As shown, a sealing groove is provided on one of the sidewall of the chamber and the surface of the movable assembly 21. The chamber assembly 1 further includes a sealing ring 25 disposed in the sealing groove. The sealing ring 25 is sleeved on the movable assembly 21. Preferably, the sealing groove is provided on the sidewall of the chamber and is arranged between the compression chamber 3 and the movable chamber 4.

[0143] Preferably, if Figures 5 to 9 As 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 larger 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.

[0144] Specifically, the sealing portion 16 with a larger diameter can not only ensure the sealing effect between the sealing ring 25, but also the diameter of the sealing portion 16 is larger than the connecting portion 20, so that when the movable part 34 moves in the direction of expanding the compression chamber 3, it can abut against the second cavity 26 without leaving the cavity, which has great practical significance.

[0145] Based on the above embodiments, 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 one-way 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.

[0146] Specifically, the one-way valve disposed in the water flow channel and the check valve disposed at the outlet 22 can effectively prevent the fluid in the DC pump from flowing back, greatly improving the working efficiency of the DC pump and having great practical significance.

[0147] Based on the above embodiments, Figure 3 、 5 As shown in FIG6 , in a preferred embodiment of the present invention, the flow channel structure further comprises an elastic member 18 located in the compression chamber 3 for driving the movable assembly 21 to move in a direction of expanding the compression chamber 3. Specifically, the elastic member 18 is a round coil spring.

[0148] Example 5: Please refer to Figures 1 to 10 An embodiment of the present invention provides a housing structure of a DC pump, which can be applied to the DC pump described in Example 1.

[0149] The housing structure includes a shell assembly 42 , a cavity assembly 1 , a movable assembly 21 , and a drive assembly 19 .

[0150] Housing assembly 42 comprises a water outlet chamber 51, a water inlet chamber 55, and a power chamber 54. Cavity assembly 1 is disposed within water outlet chamber 51. Cavity assembly 1 comprises a chamber, an opening 5 communicating with the chamber, and an outlet 22. Movable assembly 21 is movably positioned within opening 5 and divides the chamber into a compression chamber 3 and a movable chamber 4. Drive assembly 19 is disposed within power chamber 54 and is used to drive reciprocating motion of movable assembly 21.

[0151] Specifically, different components are installed in different chambers of the housing assembly 42. By installing different components in different chambers, the various parts can be effectively combined into a whole, so that the various components are no longer fixed by bolts. Not only is the structure more compact, but it can also effectively prevent the equipment from loosening during operation, reduce vibration during operation, and reduce the probability of damage.

[0152] Based on the above embodiments, Figures 2 to 4As shown, in a preferred embodiment of the present invention, the housing assembly 42 comprises a pair of shells 43. These shells 43 cooperate to form a water outlet chamber 51, a water inlet chamber 55, and a power chamber 54. Specifically, the shells 43 are generally symmetrical, one of which is provided with a screw post 48 for securing a screw, and the other with a screw hole for a screw to pass through. The two shells 43 are combined to secure the chamber assembly 1, the movable assembly 21, and the drive assembly 19, making installation more convenient and the structure more robust.

[0153] Based on the above embodiments, Figures 2 to 4 As shown, in a preferred embodiment of the present invention, the housing structure further includes a transmission chamber 47 connected to the water outlet chamber 51, the water inlet chamber 55, and the power chamber 54. The drive assembly 19 includes a drive gear 9 and a motor 46. The drive gear 9 is disposed in the transmission chamber 47 and is sleeved within the movable assembly 21. The motor 46 is disposed in the power chamber 54 and is in transmission connection with the drive gear 9. Mounting the drive gear 9 in a separate transmission chamber 47 better secures the drive gear 9 and prevents it from loosening after long-term operation.

[0154] Preferably, the drive assembly 19 includes a power gear 45 disposed on the output shaft of the motor 46. The power gear 45 is located in a transmission chamber 47 and is in transmission connection with the drive gear 9. Specifically, the power gear 45 is thicker than the drive gear 9; the transmission chamber 47 has a power slot 52 to accommodate the power gear 45. The thickness of the power gear 45 is greater than that of the drive gear 9, which can better ensure the meshing effect between the power gear 45 and the drive gear 9. The transmission chamber 47 is used to mount the drive gear 9. Its width is just wide enough to accommodate the drive gear 9, and a groove is provided on the power gear 45 to accommodate the power gear 45.

[0155] Preferably, the side of the drive gear 9 is provided with a plurality of hemispherical protrusions 44; the plurality of hemispherical protrusions 44 are evenly distributed along the circumference of the axis of the drive gear 9. Specifically, the provision of the plurality of hemispherical protrusions 44 on the side of the drive gear 9 can effectively reduce the contact area between the drive gear 9 and the housing 43, thereby reducing the friction force experienced by the drive gear 9, especially the maximum static friction force, thereby ensuring the driving effect of the drive assembly 19 and greatly improving the energy conversion efficiency.

[0156] Based on the above embodiments, Figures 2 to 4 As shown, in a preferred embodiment of the present invention, the chamber assembly 1 includes a check valve located at the outlet 22 and a fixing member 23 for securing the check valve. The outer wall of the fixing member 23 is provided with a fixing groove 27. The housing 43 has a fixing protrusion 49 that matches the fixing groove 27. Specifically, the check valve prevents fluid from flowing backward and back, significantly improving the efficiency of the DC valve. The fixing member 23, which is used to secure the check valve, is secured by the fixing protrusion 49, which greatly improves the efficiency of DC valve assembly.

[0157] Based on the above embodiments, Figures 2 to 4 As shown, in a preferred embodiment of the present invention, the housing assembly 42 has a notch 53 communicating with the power chamber 54 so as to enable the motor 46 to be electrically connected to an external power source.

[0158] Based on the above embodiments, Figures 2 to 4 As shown, in a preferred embodiment of the present invention, the cavity assembly 1 and movable assembly 21 are rotating geometric bodies. Ribs 28 are provided on one of the outer wall of the cavity assembly 1 and the inner wall of the water outlet chamber 51, while the other is provided with grooves 50 for securing the ribs 28. Specifically, the structure of the ribs 28 and grooves 50 provides a simple and secure fixation. A pair of housings 43 are combined to enclose the cavity assembly 1, effectively securing it from all directions and simplifying installation.

[0159] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A DC pump comprising: A cavity assembly (1) comprises a first cavity (24), a second cavity (26), and a sealing ring (25); the first cavity (24) has a cavity, an opening (5) and an outlet (22) connected to 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) and located on the side wall of the cavity; the sealing ring (25) is arranged in the sealing groove; A movable component (21) is movably located at the opening (5) to separate the chamber into a compression chamber (3) and an active 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 movable component (21) has a sealing portion (16) located in the chamber, and a connecting portion (20) extending outward through the second chamber (26): It is characterized in that the DC pump further comprises: an inlet channel (17) passing through the movable assembly (21) and communicating with the compression chamber (3); a one-way valve, disposed in the inlet channel (17), so as to allow external fluid to pass through the inlet channel (17) and enter the compression chamber (3); A driving assembly (19) is used to drive the movable assembly (21) to move a distance A in a 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 (BC) ≤ A ≤ 0.35 (BC); The driving assembly (19) includes a round coil spring located in the compression chamber (3); the round coil spring is used to drive the movable assembly (21) to move in a direction of expanding the compression chamber (3); the original length of the round coil spring is F; wherein 0.83F≤BC≤0.9F; The maximum distance between the sealing ring (25) and the connection between the sealing portion (16) and the connection portion (20) is D; DA>1mm; The diameter of the compression chamber (3) is E; wherein BC=E; The movable component (21), the inlet 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) so as to be closely matched 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; 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); the card slot (29) and the card protrusion (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 wall of the movable 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 provided along the axial direction of the movable component (21); the second protrusion (14) is slidably arranged in the groove to limit the rotation of the movable component (21); The one-way valve is located in the movable component (21); The movable assembly (21) includes a main body (35) that is movable and located at the opening (5); the inlet channel (17) includes a first flow channel (40) provided on the main body (35); the one-way valve includes a movable member (34) that is movably arranged in the first flow channel (40), and a limiting member (33) for preventing the movable member (34) from escaping 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 allow the first flow channel (40) to communicate with the compression chamber (3).

2. The DC pump according to claim 1, characterized in that The diameter of one end of the first flow channel (40) connected to the compression chamber (3) is increased to accommodate the movable member (34); The movable member (34) has a gap (41) for connecting the first flow channel (40) and the compression chamber (3), and a sealing surface facing the inside of the first flow channel (40); The sealing surface can abut against the main body (35) to seal the first flow channel (40).

3. The DC pump according to claim 2, characterized in that: The limiting member (33) is a rotating geometric body; The limiting member (33) is embedded in one end of the first flow channel (40) connected to the compression chamber (3); The inlet channel (17) further comprises a second flow channel (36) provided on the limiting member (33); the second flow channel (36) is used to connect the first flow channel (40) and the compression chamber (3); the second flow channel (36) gradually increases toward one end of the compression chamber (3) and forms a bell mouth α with an angle of 15 to 25 degrees.

4. The DC pump according to claim 3, characterized in that: 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), gaps (41) for communicating the first flow channel (40) and the second flow channel (36) are formed facing each other.

5. The DC pump according to claim 4, characterized in that: The bell mouth of the second flow channel (36) is 20°; The movable member (34) has four first abutting portions (38) and four second abutting portions (37).

6. The DC pump according to any one of claims 2 to 5, characterized in that: The movable member (34) is a rotationally symmetrical geometric body; The sealing surface is an inclined end surface (39) at the end of the movable member (34); The first flow channel (40) has an inclined surface adapted to the sealing surface.

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