Electromagnetic pump

Abstract

The invention provides an electromagnetic pump which comprises a valve body provided with a valve cavity, a movable iron core and a valve needle, the valve needle comprises a pipe body and a seat body, the movable iron core is in sealing fit with the pipe body, the valve body is in sealing fit with the seat body, the movable iron core is provided with a first flow channel extending in the axial direction, the first flow channel penetrates through the movable iron core to form a first opening part and a second opening part, and the first opening part is communicated with the second opening part. A first opening part is defined as a valve port; one part of the pipe body is located in the first flow channel, the other part of the pipe body penetrates through the second opening part and is located outside the first flow channel, the valve needle is provided with a second flow channel, the second flow channel sequentially penetrates through the pipe body and the seat body, the second flow channel is communicated with the first flow channel, the hole wall of the first flow channel of the movable iron core can be in sliding fit with the pipe body, and the outer wall of the movable iron core can be in sliding fit with the valve cavity. By improving the structure of the electromagnetic pump, product miniaturization and space utilization rate can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and specifically, to an electromagnetic pump. Background Art

[0002] An electromagnetic pump is a liquid pump that uses alternating current to provide working power to achieve liquid output. When the electromagnetic part is energized, it provides an electromagnetic force driving force for the iron core. The iron core has a long rod structure with an inlet channel and a transverse hole. During the movement of the iron core, the medium can repeatedly pass through the inlet channel and the transverse hole to balance the pressure difference.

[0003] For those skilled in the art, it is necessary to miniaturize the product and improve the space utilization rate as much as possible. Summary of the Invention

[0004] An object of the present invention is to provide a new technical solution for an electromagnetic pump, which realizes the miniaturization of the product and the space utilization rate by improving the structure of the electromagnetic pump.

[0005] The present invention provides an electromagnetic pump, which includes a valve body with a valve cavity, a moving iron core, a pipe body, and a seat body. The moving iron core is hermetically fitted with the pipe body, and the valve body is hermetically fitted with the seat body. The moving iron core has a first flow channel extending axially, and the first flow channel penetrates through the moving iron core. The moving iron core is provided with a first orifice and a second orifice, and the first orifice is defined.

[0006] A part of the seat body is located in the first flow channel, and another part passes through the second orifice and is located outside the first flow channel. The seat body has a second flow channel, and the second flow channel is communicated with the first flow channel. The pore wall of the first flow channel of the moving iron core can be slidably fitted with the seat body, and the outer wall of the moving iron core can be slidably fitted with the valve cavity.

[0007] Through the optimized design of the structure of the electromagnetic pump, the present invention makes a part of the seat body located in the first flow channel, and another part passes through the second orifice and is located outside the first flow channel. The seat body has a second flow channel, and the second flow channel is communicated with the first flow channel. The pore wall of the first flow channel of the moving iron core can be slidably fitted with the seat body, and the outer wall of the moving iron core can be slidably fitted with the pipe body, improving the long rod-shaped iron core structure design in the background art, realizing the miniaturization design of the product in the axial direction and relatively improving the space utilization rate of the components. Brief Description of the Drawings

[0008] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present specification, and together with the description are used to explain the principles of the present specification.

[0009] Figure 1 is a schematic structural diagram of the electromagnetic pump in the embodiment of the present invention;

[0010] Figure 2 is Figure 1 a schematic structural diagram of the valve needle in

[0011] Figure 3 is Figure 2 a sectional view of;

[0012] Figure 4 is Figure 1 a schematic structural view of the movable iron core in, side view perspective;

[0013] Figure 5 is Figure 1 a schematic structural view of the movable iron core in, top view perspective;

[0014] Figure 6 is Figure 4 one of the side sectional views of;

[0015] Figure 7 is Figure 4 the other side sectional view of;

[0016] Figure 8 is a three - dimensional mating view of the valve needle and the piston.

[0017] Explanation of reference numerals:

[0018] 1. Valve body; 11. Valve cavity; 11a. Outlet; 11b. Inlet; 111. Upper cavity; 112. Lower cavity; 2. Electromagnetic drive member; 31. Elastic part; 4. Movable iron core; 41. First flow channel; 41a. First orifice; 41b. Second orifice; 42. Pressure relief channel; 5. Valve needle; 51. Tube body; 51a. Head end; 51b. Tail end; 52. Seat body; 521. Limiting boss; 53. Second flow channel; 522. Stop face; 6. Shock - absorbing spring; 7. Check ball; 81. Seal; 82. Accommodating groove; 82a. Step groove; 82b. Groove; 83. Retaining ring; 84. Flange; 9. Piston ball. Detailed implementation manners

[0019] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0020] This application provides an electromagnetic pump. As Figure 1 shown, the electromagnetic pump includes a valve body 1 provided with a valve cavity 11, an electromagnetic drive member 2, a movable iron core 4, and a valve needle 5. The valve needle 5 includes a tube body 51 and a seat body 52. The movable iron core 4 is in sealing cooperation with the tube body 51, and the valve body 1 is in sealing cooperation with the seat body 52.

[0021] The movable iron core 4 has a first flow channel 41 extending axially. One end of the first flow channel 41 penetrating the axial direction of the movable iron core 4 forms a first orifice 41a, and the first orifice 41a is defined as the valve port. The other end of the first flow channel 41 penetrating the axial direction of the movable iron core 4 forms a second orifice 41b. The first orifice 41a is used to communicate with the valve cavity 11.

[0022] A part of the pipe body 51 is located in the first flow channel 41, and another part passes through the second orifice 41b and is located outside the first flow channel 41. The valve needle 5 has a second flow channel 53 which sequentially penetrates through the pipe body 51 and the seat body 52. The second flow channel 53 communicates with the first flow channel 41. The pore wall of the first flow channel 41 of the moving iron core 4 can be in sliding fit with the pipe body 51, and the outer wall of the moving iron core 4 can be in sliding fit with the inner wall of the valve cavity 11. During the working process, the moving iron core 4 undergoes axial displacement, and the valve needle 5 does not move. While the moving iron core 4 undergoes axial displacement, the inner wall of the moving iron core 4 axially slips relative to the pipe body 51, and the outer wall is in sliding fit with the inner wall of the valve cavity 11.

[0023] A part of the pipe body 51 is located in the first flow channel 41, a part passes through the second orifice, and is located outside the first flow channel 41, and is fixed relative to the valve body 1. The valve needle 5 has a second flow channel 53, and the second flow channel 53 communicates with the first flow channel 41.

[0024] Through the optimized design of the electromagnetic pump structure of the present invention, a part of the seat body 52 is located in the first flow channel 41, and another part passes through the second orifice 41b and is located outside the first flow channel 41. The seat body 52 has a second flow channel 53, and the second flow channel 53 communicates with the first flow channel 41. The pore wall of the first flow channel 41 of the moving iron core 4 can be in sliding fit with the seat body 52, and the outer wall of the moving iron core 41 can be in sliding fit with the pipe body 51. The long-rod type iron core structure design in the background art is improved, and the product can be miniaturized axially and the space utilization rate of parts is relatively increased.

[0025] In an optional embodiment, a piston ball 9 is arranged in the first flow channel 41. The piston ball 9 is elastically supported between the valve needle 5 and the first orifice 41a. The piston ball 9 can seal the first orifice 41a.

[0026] The electromagnetic driving member 2 is energized. The moving iron core 4 can move axially in a direction away from the valve needle 5. The piston ball 9 gradually moves away from and opens the first orifice 41a.

[0027] In this embodiment, an elastic part 31 can also be arranged in the valve cavity 11, and the elastic part 31 is connected between the moving iron core 4 and the valve body 1. In the state where the electromagnetic driving member 2 is de-energized, the moving iron core 4 is driven to reset, and the piston ball 9 gradually approaches and closes the first orifice 41a.

[0028] In this embodiment, the first flow channel can have a diameter section and a tapered section connected axially. The position where the diameter section and the tapered section are connected is the first orifice 41a. The piston ball 9 is used to form a stop for the piston ball. The tapered section plays a guiding role, thereby improving the sealing performance between the piston ball 9 and the first orifice 41a.

[0029] Specifically, referring to Figures 1-3 , the valve needle 5 includes a connected tube body 51 and a seat body 52, and the seat body 52 abuts against the valve body 1 in the radial direction. The seat body 52 and the valve needle 5 can be connected by bolts, or can be connected by welding, riveting or gluing, as long as the bidirectional limit of the seat body 52 in the radial and axial directions can be maintained. The tube body 51 has a head end 51a and a tail end 51b. The head end 51a of the tube body 51 is arranged on the seat body 52, and the tail end 51b is inserted into the first flow channel 41.

[0030] The valve needle 5 has a second flow channel 53, and the second flow channel 53 penetrates through the tube body 51 and the seat body 52. The first flow channel 41 is communicated with the outlet 11a through the second flow channel 53; the outlet 11a can be communicated with the outside.

[0031] The first port 41a is used to communicate with the valve cavity 11. Compared with the second port 41b, the first port 41a is closer to the inlet of the external medium at the inlet 11b. A piston ball 9 is arranged in the first flow channel 41, and the piston ball 9 is elastically supported between the tail end 51b and the first port 41a. The piston ball 9 can be connected to the tail end 51b through an elastic member. Thereby, the impact of the piston ball 9 on the tail end 51b can be reduced, and the vibration of the electromagnetic pump can be reduced. In addition, the piston ball 9 is arranged at the position of the first port 41a, which can enable the piston ball 9 to directly face the impact of the medium flow from the inlet 11b. This can improve the movement sensitivity of the piston ball 9, improve the sealing performance between the piston ball 9 and the first port 41a, and improve the negative pressure suction lift of the electromagnetic pump.

[0032] In the electromagnetic pump of the present application, the switching method is that the electromagnetic driving member 2 is energized and acts on the moving iron core 4. The moving iron core 4 moves axially in the direction away from the valve needle 5 and drives the elastic part 31 to deform. The piston ball 9 gradually moves away and opens the first port 41a. The elastic part 31 resets to drive the moving iron core 4 to reset. The piston ball 9 gradually approaches and closes the first port 41a under the support of the valve needle 5.

[0033] Among them, the valve needle 5 and the elastic part 31 are axially arranged on both sides of the moving iron core 4, or are located on the same side of the moving iron core 4. Here, the relative positions of the valve needle 5 and the elastic part 31 are not limited.

[0034] By adopting the method in this embodiment, by inserting the valve needle 5 into the first flow channel 41 of the moving iron core 4, the moving iron core 4 can be limited in the moving direction of the moving iron core 4, preventing the moving iron core 4 from being radially misaligned during the moving process, preventing the friction between the moving iron core 4 and the valve body 1 after the moving iron core 4 is misaligned, and reducing the noise of the electromagnetic pump.

[0035] Meanwhile, compared with the traditional electromagnetic pump, in the technical solution of the present application, the traditional electromagnetic pump arranges the valve needle 5 outside the moving iron core 4 instead of inserting it axially into the moving iron core 4. The method of arranging the valve needle 5 outside will limit the length of the moving iron core 4 by the length of the valve needle 5.

[0036] However, in the present application, by inserting a part of the valve needle 5 into the first flow channel 41, the proportion of the moving iron core 4 in the total length of the moving iron core 4 and the valve needle 5 can be increased. Based on this, it provides a greater space for those skilled in the art to design the length of the moving iron core 4. Even if the length of the moving iron core 4 remains unchanged, the length of the electromagnetic pump can be effectively reduced, which is beneficial to the miniaturization of the electromagnetic pump. Similarly, if the original design length of the electromagnetic pump remains unchanged, the length of the moving iron core 4 can be increased, thereby effectively reducing the magnetic resistance between the moving iron core 4 and the electromagnetic driving member 2, improving the electromagnetic force of the electromagnetic driving member 2, and reducing the cost of the electromagnetic pump.

[0037] In an alternative embodiment of the electromagnetic pump, please continue to refer to Figure 1 , the electromagnetic pump further includes a shock-absorbing spring 6. The shock-absorbing spring 6 is axially supported between the valve body 1 and the moving iron core 4, and the shock-absorbing spring 6 is used to stop the moving iron core 4 in the moving direction of the moving iron core 4 during the reset process of the moving iron core 4.

[0038] Optionally, a limiting boss 521 is provided on the end face of the seat body 52 close to the moving iron core 4. The radial dimension of the limiting boss 521 is smaller than the radial dimension of the seat body 52. The limiting boss 521 is inserted into the shock-absorbing spring 6 and is in radial limiting fit with the shock-absorbing spring 6. Thus, it can be avoided that the shock-absorbing spring 6 is radially misaligned during the long-term use of the electromagnetic pump.

[0039] In another embodiment, please refer to Figure 2 、 Figure 3 and Figure 8 As shown, the seat body 52 is provided with a stop face portion 522. The stop face portion 522 is in stop fit with the moving iron core 4 in the moving direction of the moving iron core 4. The seat body 52 is connected with a shock-absorbing pad (not shown in the figure), and the stop face portion 522 is located on the shock-absorbing pad.

[0040] Through the above embodiments, it is possible to reduce or avoid the impact of the moving iron core 4 on the valve body 1 during the reset process of the moving iron core 4, thereby reducing the vibration of the electromagnetic pump. Among them, the use of the shock-absorbing pad can simplify the structure of the electromagnetic pump, and the use of the shock-absorbing spring 6 can avoid the direct impact of the moving iron core 4 on the valve body 1 during reset.

[0041] In the above embodiments, please refer to Figure 1 、 Figure 4 and Figure 5, the moving iron core 4 divides the valve cavity 11 into an upper cavity 111 and a lower cavity 112. The first port 41a communicates with the upper cavity 111, and the second port 41b communicates with the lower cavity 112. During the axial movement of the moving iron core 4, in order to balance the pressure difference between the upper cavity 111 and the lower cavity 112, a plurality of pressure relief channels 42 are formed on the outer peripheral wall of the moving iron core 4. The pressure relief channels 42 are evenly arranged along the circumferential direction of the moving iron core 4 and penetrate the moving iron core 4 axially. One end of each pressure relief channel 42 communicates with the upper cavity 111, and the other end communicates with the lower cavity 112.

[0042] In an optional embodiment, continue to refer to Figure 1 , a check ball 7 is further provided at the outlet 11a of the electromagnetic pump. When the first port 41a is closed, the check ball 7 moves away from and opens the outlet 11a, and the outlet 11a communicates with the outside; when the outlet 11a is opened, the check ball 7 moves closer to and closes the outlet 11a. Of course, the electromagnetic pump may not be provided with the check ball 7, but other structural forms may be adopted, and those skilled in the art can select according to the type of the electromagnetic pump.

[0043] In some embodiments of the present application, refer to Figure 1 , Figure 6 and Figure 7 , the electromagnetic pump further has a seal 81. The seal 81 is radially pressed between the wall of the first flow channel 41 and the outer wall of the valve needle 5 to separate the first flow channel 41 from the valve cavity 11.

[0044] Specifically, when the valve needle 5 extends into the first flow channel 41, there is a gap between the valve needle 5 and the wall forming the first flow channel 41, and the gap has a set tolerance. Radially, the seal 81 is elastically compressed in the gap. Radially, one side of the seal 81 is pressed against the wall forming the first flow channel 41, and the other side is pressed against the outer wall of the pipe body 82, thereby sealing the first flow channel 41 from the valve cavity 11. At the same time, since the second flow channel 53 is connected to the first flow channel 41, by sealing the first flow channel 41, the second flow channel 53 can also be sealed.

[0045] In the above embodiment, the moving range of the tail end 51b of the pipe body 51 in the first flow channel 41 determines the axial position of the receiving groove 82. The moving range of the tail end 51b refers to the part that can contact the wall of the first flow channel 41 during the movement of the tail end 51b. The receiving groove 82 is axially arranged within the moving range of the pipe body 51 in the first flow channel 41, so that the seal 81 is also within this moving range, so that the seal 81 is always pressed against the outer wall of the valve needle 5. It is avoided that the receiving groove 82 is arranged outside this range, and the seal 81 is disengaged from the outer wall of the valve needle 5, affecting the sealing performance.

[0046] Optionally, an annular receiving groove 82 is provided at the other end of the moving iron core. The receiving groove 82 is recessed radially outward from the wall of the first flow channel, and at least a part of the seal 81 is located in the receiving groove 82.

[0047] Specifically, in one example, as Figure 6 shown, the receiving groove 82 is a groove 82b. The groove 82b can be formed by machining or injection molding. In an optional processing method, a groove is axially formed from the end face of the moving iron core 4, and the groove communicates with the first flow channel 41. The seal 81 is placed in the groove, and a flange 84 is formed at the notch of the groove. The flange 84 and the groove together form the groove 82b, and the flange 84 is used to axially limit the seal 81.

[0048] In another example, as Figure 7 shown, the receiving groove 82 is a stepped groove 82a. The electromagnetic pump further includes a retaining ring 83, and the retaining ring 83 covers the opening of the stepped groove 82a to axially limit the seal 81.

[0049] Next, the connection method between the retaining ring 83 and the moving iron core 4 will be described.

[0050] In some examples, the retaining ring 83 is threadedly connected, welded or bonded to the moving iron core 4. At this time, a shock-absorbing spring 6 or a shock-absorbing pad can be provided in the valve cavity 11 to reduce the vibration of the electromagnetic pump.

[0051] In other examples, when a shock-absorbing spring 6 is provided in the valve cavity 11 to reduce the vibration of the electromagnetic pump, one end of the shock-absorbing spring 6 abuts against the seat body 52, and the other end abuts against the retaining ring 83. Since the shock-absorbing spring 6 remains in a deformed state, the retaining ring 83 can always be pressed tightly against the moving iron core 4 under the elastic force of the shock-absorbing spring 6.

[0052] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An electromagnetic pump, characterized in that, It includes a valve body (1) provided with a valve cavity (11), a moving iron core (4), and a valve needle (5). The valve needle (5) includes a tube body (51) and a seat body (52). The moving iron core (4) is in sealing fit with the tube body (51), and the valve body (1) is in sealing fit with the seat body (52). The moving iron core (4) has a first flow channel (41) extending axially, and the first flow channel (41) penetrates through the moving iron core (4) to form a first opening (41a) and a second opening (41b). The first opening (41a) is defined as the valve port. A part of the tube body (51) is located in the first flow channel (41), and another part passes through the second opening (41b) and is located outside the first flow channel (41). The valve needle (5) has a second flow channel (53), and the second flow channel (53) sequentially penetrates through the tube body (51) and the seat body (52). The second flow channel (53) is communicated with the first flow channel (41). The pore wall of the first flow channel (41) of the moving iron core (4) can be in sliding fit with the tube body (51), and the outer wall of the moving iron core (4) can be in sliding fit with the valve cavity (11).

2. The electromagnetic pump according to claim 1, characterized in that, The electromagnetic pump also has a seal (81), and the seal (81) is radially pressed between the wall of the first flow channel (41) and the outer wall of the valve needle (5) to separate the first flow channel (41) from the valve cavity (11).

3. The electromagnetic pump according to claim 2, wherein, The other end of the moving iron core (4) is provided with an annular receiving groove (82), and at least part of the seal (81) is located in the receiving groove (82). The inner wall of the first flow channel is recessed radially to form the receiving groove (82).

4. The electromagnetic pump according to claim 3, characterized in that, The other end of the moving iron core (4) is provided with an annular receiving groove (82), and the receiving groove (82) is a stepped groove (82a). The electromagnetic pump further includes a retaining ring (83), and the retaining ring (83) covers the opening of the stepped groove (82a) to form a limit with the seal (81) axially.

5. The electromagnetic pump according to claim 4, characterized in that, The retaining ring (83) is threadedly connected, welded or adhered to the moving iron core (4).

6. The electromagnetic pump according to claim 5, wherein The valve needle (5) includes a tube body (51) and a seat body (52). The seat body (52) abuts against the valve body (1) radially. One end of the tube body (51) is arranged on the seat body (52), and the other end is inserted into the first flow channel (41). The second flow channel (53) penetrates through the seat body (52). The electromagnetic pump further includes a shock-absorbing spring (6). One end of the shock-absorbing spring (6) abuts against the seat body (52), and the other end abuts against the retaining ring (83). The shock-absorbing spring (6) maintains a deformed state, and the retaining ring (83) presses the moving iron core (4) under the elastic force of the shock-absorbing spring (6).

7. The electromagnetic pump according to any one of claims 1-6, characterized in that, It also includes a shock-absorbing spring (6). The shock-absorbing spring (6) is axially supported between the valve body (1) and the moving iron core (4). The shock-absorbing spring (6) is used to stop the moving iron core (4) in the moving direction during the reset process of the moving iron core (4); or, The valve needle (5) includes a tube body (51) and a seat body (52) connected to each other. The seat body (52) is provided with a stop surface portion (522), and the stop surface portion (522) is in stop cooperation with the moving iron core (4) in the moving direction of the moving iron core (4). The seat body (52) is connected with a shock pad, and the stop surface portion (522) is located on the shock pad.

8. The electromagnetic pump according to claim 7, characterized in that, A limit boss (521) is arranged on the end surface of the seat body (52) close to the moving iron core (4). The limit boss (521) is inserted into the shock absorption spring (6) and is in radial limit cooperation with the shock absorption spring (6).

9. The electromagnetic pump according to any one of claims 1-6, characterized in that, The moving iron core (4) divides the valve cavity (11) into an upper cavity (111) and a lower cavity (112). A plurality of pressure relief channels (42) are formed on the outer peripheral wall of the moving iron core (4). The pressure relief channels (42) are uniformly arranged along the circumferential direction of the moving iron core (4) and penetrate through the moving iron core (4) axially. One end of each pressure relief channel (42) is communicated with the upper cavity (111), and the other end is communicated with the lower cavity (112).

10. The electromagnetic pump according to any one of claims 1-6, characterized in that, A piston ball (9) is arranged in the first flow channel (41). The piston ball (9) is elastically supported between the valve needle (5) and the first port (41a), and the piston ball (9) can seal the first port (41a). The electromagnetic pump further includes an electromagnetic driving member (2). When the electromagnetic driving member (2) is energized, the moving iron core (4) can move axially in a direction away from the valve needle (5), and the piston ball (9) gradually moves away from and opens the first port (41a).

11. The electromagnetic pump according to claim 10, wherein The first flow channel has a diameter section and a tapered section connected axially. The first port (41a) is located at the connection position of the tapered section and the diameter section, and the tapered section is used to form a stop for the piston ball (9).

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