A micro-piston pump

Abstract

The utility model discloses a kind of micro plunger pumps, comprising: pump body, cylindrical coil, movable core in the axis of cylindrical coil, water inlet pipe and water outlet pipe, valve port is opened in water outlet pipe, check valve assembly is provided at the outlet of valve port and is matched with movable core, to control the on-off of valve port, it is characterized in that, check valve assembly includes the check valve plug made of elastomer material and the cylindrical check valve seat made of metal or polyformaldehyde, elastic component and check valve support seat, check valve seat is installed at the outlet of valve port, the top of check valve seat is provided with the first through-hole corresponding with valve port, elastic component is installed at the end of check valve plug and is matched with check valve support seat to make the arc surface of check valve plug and the outlet of first through-hole abut, the check valve plug made of elastomer material and the cylindrical check valve seat made of metal or polyformaldehyde, not easy to occur chemical reaction, can effectively solve the problem of check valve plug and valve port adhesion.

Description

Technical Field

[0001] This utility model relates to a miniature plunger pump, which may be classified under IPC number F04B 53 / 10 or F04B 53 / 00. Background Technology

[0002] Currently, miniature plunger pumps used in small appliances typically incorporate a check valve assembly at the valve port to control unidirectional flow. For valve ports generally made of plastic, the check valve assembly usually uses a rubber check valve plug. However, after prolonged use, due to the presence of moisture within the pump body, the check valve plug, constantly pressed against the valve port, is prone to chemical reaction and adhesion, thus blocking the valve port and affecting normal pump operation. This results in suboptimal performance and durability.

[0003] Common knowledge and related terminology can be found in Chinese patents CN218818494U, CN221175888U and CN111928007B, as well as "Theory and Design of Special Pumps" (China Water Resources and Hydropower Press, 1st edition, 2013), "Valve Handbook - Selection" (Chemical Industry Press, 1st edition, 2013), "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" (Mechanical Industry Press, 1st edition, 1978 and 2nd edition, 1997). Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a miniature plunger pump that can effectively solve the problem of adhesion between the valve port and the check valve plug of the miniature plunger pump, and has better performance and durability.

[0005] In a first aspect, this utility model provides a miniature plunger pump, comprising: a pump body, a cylindrical coil, a movable iron core located on the axis of the cylindrical coil, an inlet pipe, and an outlet pipe. A valve port is provided in the outlet pipe, and a check valve assembly is provided at the outlet of the valve port and cooperates with the movable iron core to control the opening and closing of the valve port. The check valve assembly includes a check valve plug made of an elastomeric material, a cylindrical check valve seat made of metal or polyoxymethylene, an elastic component, and a check valve support. The check valve seat is installed at the outlet of the valve port, and a first through hole corresponding to the valve port is provided at the top of the check valve seat. The elastic component is installed at the end of the check valve plug and cooperates with the check valve support so that the arc surface of the check valve plug abuts against the outlet of the first through hole.

[0006] The miniature plunger pump according to the present invention has at least the following beneficial effects: by setting a metal check valve seat and a check valve plug made of rubber or soft engineering plastic or other elastomeric materials at the outlet valve of the miniature plunger pump to control the opening and closing of the valve, when the miniature plunger pump is stored with water for a long time, the metal or POM (polyoxymethylene) check valve seat is not prone to chemical reaction with the check valve plug made of rubber or soft engineering plastic or other elastomeric materials, thereby preventing the check valve plug from sticking to the valve, improving the stability of the miniature plunger pump opening, and having better performance and durability.

[0007] According to some embodiments of this utility model, the outer peripheral wall of the check valve seat is provided with an annular groove for installing a sealing ring. This prevents the miniature plunger pump from depressurizing.

[0008] According to some embodiments of this utility model, the outer wall of the check valve support is provided with a flange, and the inner wall of the outlet pipe is formed with a thread that mates with the flange. The flange is inserted into the thread to fix the check valve support and axially press the check valve seat, making the installation of the check valve seat more stable.

[0009] According to some embodiments of this utility model, the inner wall of the check valve support seat extends a cross-shaped reinforcing rib in the radial direction and forms a first water outlet hole with the inner side. The cross-shaped reinforcing rib presses against the elastic component, and the cross-shaped reinforcing rib effectively improves the strength of the side wall of the check valve support seat.

[0010] According to some embodiments of this utility model, the side wall of the check valve support seat is provided with a first notch, which connects to the first water outlet. The first notch can further increase the water outlet area and increase the water output. Attached Figure Description

[0011] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0012] Figure 1 This is an overall schematic diagram of a miniature plunger pump provided in one embodiment of the present invention;

[0013] Figure 2 yes Figure 1 A side view of the miniature plunger pump is shown.

[0014] Figure 3 yes Figure 2 A cross-sectional view (AA) of the miniature plunger pump is shown.

[0015] Figure 4 yes Figure 3 A schematic diagram of the overall check valve seat of the miniature plunger pump is shown.

[0016] Figure 5 yes Figure 4 A schematic diagram of the overall structure of the check valve seat without a sealing ring is shown.

[0017] Figure 6 yes Figure 3 A schematic diagram of the overall structure of the check valve support for the miniature plunger pump is shown.

[0018] Figure 7 yes Figure 6 The bottom view of the check valve support is shown.

[0019] Figure 8 yes Figure 3 A magnified view of part A of the miniature plunger pump is shown.

[0020] Icon labels:

[0021] Water inlet pipe 100; water inlet 110;

[0022] Pump body 200; stator assembly 210; movable iron core 211; magnetic inner sleeve 212; water-proof pipe 213; washer 214; main spring 215; bolt 216; magnetic yoke 217; second through hole 218; pump cover 220; one-way valve assembly 230; cylindrical coil 240;

[0023] Water outlet pipe 300; valve port 310; check valve assembly 320; check valve plug 321; check valve seat 322; elastic component 323; check valve support seat 324; first through hole 330; annular groove 331; flange 332; thread 333; cross reinforcing rib 334; first notch 335; first water outlet hole 336; sealing ring 340; water outlet 350. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] Reference Figures 1 to 3 as well as Figure 8 The miniature plunger pump includes a pump body 200, a cylindrical coil 240, a movable iron core 211 located in the cylindrical coil 240, an inlet pipe 100, and an outlet pipe 300. A valve port 310 is provided inside the outlet pipe 300, and a check valve assembly 320 is provided at the outlet of the valve port 310. The check valve assembly 320 cooperates with the movable iron core 211 to control the opening and closing of the valve port 310. The check valve assembly 320 includes a check valve plug 321 and a cylindrical stop valve. The system comprises a check valve seat 322, an elastic component 323, and a check valve support 324. The check valve seat 322 is installed at the outlet of the valve port 310. The top of the check valve seat 322 has a first through hole 330 corresponding to the valve port 310. The elastic component 323 is installed at the end of the check valve plug 321. The check valve support 324 axially presses the elastic component 323 so that the check valve plug 321 abuts against the first through hole 330, thereby sealing the valve port 310. Since the material of the check valve seat 322 is metal or polyoxymethylene (POM), and the material of the check valve plug 321 is rubber or soft engineering plastic and other elastomer materials, when the miniature plunger pump is stored with water for a long time, the metal or POM material is not likely to chemically react with the rubber or soft engineering plastic and other elastomer materials, thereby effectively preventing the check valve plug 321 from sticking to the check valve seat 322.

[0029] refer to Figures 3 to 8The outer peripheral wall of the check valve seat 322 is provided with an annular groove 331, and a sealing ring 340 is installed on the annular groove 331. The sealing ring 340 is interference-fitted with the inner wall of the outlet pipe 300 to prevent the miniature plunger pump from depressurizing. The outer side wall of the check valve support 324 is provided with a flange 332 for snapping. The inner wall of the outlet pipe 300 is formed with a thread 333 that mates with the flange 332. The flange 332 snaps into the thread 333 to fix the check valve support 324. Specifically, during installation, the check valve seat 322 is first installed at the outlet of the valve port 310 of the outlet pipe 300, aligning the first through hole 330 with the valve port 310. Then, the check valve plug 321, the elastic member 323, and the check valve support 324 are installed in sequence. The elastic member 323 abuts against the check valve plug 321. The flange 332 of the check valve support 324 is engaged with the thread 333 on the inner wall of the outlet pipe 300 to press the check valve seat 322, the elastic member 323, and the check valve plug 321. The top edge of the check valve support 324 abuts against the bottom edge of the check valve seat 322. The elastic component 323 can be configured as a return spring, giving the connected check valve plug 321 an elastic axial displacement. When the micro plunger pump is in standby mode, the check valve plug 321 is pressed against the valve port 310 by the elastic force of the elastic component 323. When the winding of the cylindrical coil 240 of the micro plunger pump is connected to the AC power supply, the movable iron core 211 is driven to move up and down reciprocally by the alternating magnetic field generated by the current passing through the winding of the cylindrical coil 240. The check valve plug 321 is thus pushed open by the pressure of the driven water, and the valve port 310 is opened, allowing water to spray out from the valve port 310.

[0030] Understandably, the number of flanges 332 on the outer wall of the check valve support 324 can be set as needed. The more flanges 332 there are, the more stable the installation of the check valve support 324 will be. In this embodiment, the number of flanges 332 is preferably 4.

[0031] refer to Figures 6 to 8 A cross-shaped reinforcing rib 334 extends radially from the inner wall of the check valve support 324. During the installation of the flow-limiting assembly, this cross-shaped reinforcing rib 334 abuts against the elastic member 323 to press the check valve plug 321, thereby sealing the valve port 310. Simultaneously, it effectively improves the strength of the side wall of the check valve support 324. A first water outlet 336 is formed between the cross-shaped reinforcing rib 334 and the inner wall of the check valve support 324. The first water outlet 336 communicates with the water outlet 350 of the water outlet pipe 300. Water ejected from the valve port 310 flows through the first water outlet 336 and then out of the water outlet 350.

[0032] Same reference Figures 6 to 8The check valve support 324 has a first notch 335 on its side wall. The first notch 335 is located on both sides of the flange 332 and together with the first water outlet 336, forms a water outlet channel, which can further increase the water outlet area inside the water outlet pipe 300 and increase the water output. Specifically, after the water is sprayed out through the valve port 310, it flows out through the inner cavity of the check valve seat 322 from the first notch 335 and the first water outlet 336. The first notch 335 provides more radial flow area for the check valve support 324, thereby increasing the water output.

[0033] It is understood that the first notch 335 can be set on one side, both sides or other positions on the flange 332 of the peripheral wall of the check valve support 324, as long as it avoids the reinforcing ribs extending from the inner side wall. The number of the first notches 335 can be set according to actual needs. In this application, the number of the first notches 335 is preferably 8.

[0034] refer to Figure 3 The miniature plunger pump disclosed in this utility model includes a pump body 200 integrally injection molded with a stator assembly 210 as an insert. During injection molding, the pump body 200 covers the inner wall of the magnetic inner sleeve 212 to form a hollow tubular water-proof tube 213 and an inlet 110 is formed at one end of the pump body 200. The other end of the pump body 200 is coaxially connected to an outlet pipe 300 with an outlet 350. A gasket 214 is provided between the pump body 200 and the outlet pipe 300. A step on the outer periphery of one end of the outlet pipe 300 and a sealing sleeve are provided on the outer periphery of the water-proof tube 213. There is a pump cover 220, which forms a coaxial pipeline from the inlet 110 to the outlet 350. The pipeline is sequentially equipped with a check valve assembly 320, a one-way valve assembly 230, a hollow cylindrical movable iron core 211 installed in the water-proof pipe 213, and a main spring 215 axially arranged between the movable iron core 211 and the inlet 110. The pump cover 220 is fastened to the second through hole 218 of the magnetic yoke 217 with bolts 216 (when it is a threaded hole) or connected to the pump body 200 by a snap fastener and limited by a pin in the second through hole 218.

[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A miniature plunger pump, comprising: The pump body (200), cylindrical coil (240), movable iron core (211) located on the axis of the cylindrical coil (240), inlet pipe (100), and outlet pipe (300) are provided; a valve port (310) is provided in the outlet pipe (300), and a check valve assembly (320) is provided at the outlet of the valve port (310) and cooperates with the movable iron core (211) to control the opening and closing of the valve port (310). The check valve assembly (320) is characterized in that it includes a check valve plug (321) made of elastomeric material and a check valve plug (321) made of metal or polyurethane. A cylindrical check valve seat (322), an elastic component (323), and a check valve support (324) made of formaldehyde are provided. The check valve seat (322) is installed at the outlet of the valve port (310). The top of the check valve seat (322) is provided with a first through hole (330) corresponding to the valve port (310). The elastic component (323) is installed at the end of the check valve plug (321) and cooperates with the check valve support (324) so ​​that the arc surface of the check valve plug (321) abuts against the outlet of the first through hole (330).

2. The miniature plunger pump according to claim 1, characterized in that, The outer peripheral wall of the check valve seat (322) is provided with an annular groove (331) for installing a sealing ring (340).

3. The miniature plunger pump according to claim 1, characterized in that, The outer wall of the check valve support (324) is provided with a flange (332), and the inner wall of the water outlet pipe (300) is formed with a thread (333) that mates with the flange (332). The flange (332) is inserted into the thread (333) to fix the check valve support (324) and axially press the check valve seat (322).

4. The miniature plunger pump according to claim 1, characterized in that, The inner wall of the check valve support (324) extends a cross-shaped reinforcing rib (334) radially and forms a first water outlet (336) with the inner wall. The cross-shaped reinforcing rib (334) presses against the elastic component (323).

5. The miniature plunger pump according to claim 4, characterized in that, The check valve support (324) has a first notch (335) on its side wall, and the first notch (335) is connected to the first water outlet (336).

Images