Electromagnetic pump

Abstract

The invention provides an electromagnetic pump which is provided with a containing cavity part and comprises a movable iron core, a first elastic piece, a second elastic piece, a first sealing ring and a second sealing ring, and the movable iron core is located in the containing cavity part and can axially move in the containing cavity part; the first elastic piece is arranged between the movable iron core and the upper cavity wall of the containing cavity part, the second elastic piece is arranged between the movable iron core and the lower cavity wall of the containing cavity part, and the first sealing ring and the second sealing ring are arranged between the periphery of the movable iron core and the side cavity wall of the containing cavity part in a sealed mode. The first sealing ring and the second sealing ring are sequentially arranged in the axial direction. The working noise of the electromagnetic pump is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic control, in particular to an electromagnetic pump. BACKGROUND

[0002] The electromagnetic pump comprises a moving iron core, the axial movement of the moving iron core is used to realize the delivery of medium, and the moving direction of the moving iron core is opposite in the excited state and the de-energized state. Reducing the working noise of the electromagnetic pump is crucial for improving the market competitiveness of the electromagnetic pump. SUMMARY

[0003] The present application provides an electromagnetic pump with relatively small working noise. The electromagnetic pump is provided with a containing cavity, and comprises a moving iron core, a first elastic member, a second elastic member, a first sealing ring and a second sealing ring. The moving iron core is located in the containing cavity and can move axially in the containing cavity. The first elastic member is arranged between the moving iron core and the upper cavity wall of the containing cavity, the second elastic member is arranged between the moving iron core and the lower cavity wall of the containing cavity, and the first sealing ring and the second sealing ring are sealingly arranged between the outer periphery of the moving iron core and the side cavity wall of the containing cavity. The first sealing ring and the second sealing ring are arranged axially.

[0004] Since the first elastic member is arranged between the moving iron core and the upper cavity wall of the containing cavity, the second elastic member is arranged between the moving iron core and the lower cavity wall of the containing cavity, and the first sealing ring and the second sealing ring are arranged between the outer periphery of the moving iron core and the side cavity wall of the containing cavity, and the first sealing ring and the second sealing ring are arranged axially in sequence, the moving iron core will not contact the upper cavity wall of the containing cavity when moving upward, will not contact the lower cavity wall of the containing cavity when moving downward, and will not contact the side cavity wall of the containing cavity during movement, thereby relatively reducing the working noise. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 The cross-sectional view of an embodiment of the electromagnetic pump provided by the present application;

[0006] Figure 2 The partial enlarged view of Figure 1 ; The partial enlarged view of

[0007] Figure 3 The perspective view of the moving iron core in Figure 1 ; The perspective view of the moving iron core in

[0008] Figure 4 The cross-sectional view of Figure 3 ; The cross-sectional view of

[0009] Figure 5 The perspective view of the valve core in Figure 1 ; The perspective view of the valve core in

[0010] Figure 6 is a sectional view; Figure 5

[0011] Figure 7 is a perspective view of another embodiment of the valve core;

[0012] Figure 8 is a sectional view; Figure 7

[0013] Figure 9 is a perspective view of a bushing in the valve core; Figure 1

[0014] Figure 10 is a perspective view of another embodiment of the bushing.

[0015] Reference signs are explained as follows:

[0016] 1 moving iron core, 1a core through hole, 1b large diameter section, 1c small diameter section, 2 sleeve, 2a inlet, 3 bushing, 3a bushing passage, 4 valve core, 4a valve port, 4b valve core passage, 5 first opening and closing member, 6 second opening and closing member, 7 outlet pipe, 7a outlet, 8 coil, 9 coil former, 10 upper magnetic guide sleeve, 11 lower magnetic guide sleeve, 12 magnetic isolation ring, 13 housing, 14 first elastic member, 15 second elastic member, 16 third elastic member, 17 fourth elastic member, 18 limiting ring, 19 first sealing ring, 20 second sealing ring, 21 third sealing ring, 22 fourth sealing ring. DETAILED DESCRIPTION

[0017] The present application provides an electromagnetic pump, in order to make the person in the technical field better understand the technical scheme of the present application, the present application is further explained in detail below in combination with the drawings and specific embodiments.

[0018] As shown in Figure 1 , the electromagnetic pump provided by the present application comprises a moving iron core 1, a first elastic member 14, a second elastic member 15, a first sealing ring 19 and a second sealing ring 20. The electromagnetic pump is provided with a receiving cavity. In the illustrated embodiment, the sleeve 2, the bushing 3 and the valve core 4 arranged in the axial direction (up and down direction in the figure) are constructed to form the receiving cavity. The moving iron core 1 is located in the receiving cavity and can move axially in the receiving cavity.

[0019] The first elastic member 14 is arranged between the moving iron core 1 and the upper cavity wall of the receiving cavity. In the illustrated embodiment, the first elastic member 14 is specifically arranged between the upper end surface of the moving iron core 1 and a stepped surface on the inner wall of the sleeve 2.

[0020] The second elastic member 15 is arranged between the moving iron core 1 and the lower cavity wall of the receiving cavity. In the illustrated embodiment, the second elastic member 15 is specifically arranged between a stepped surface on the inner wall of the moving iron core 1 and a stepped surface inside the valve core.

[0021] ​​​The first sealing ring 19 and the second sealing ring 20 are arranged between the outer periphery of the moving iron core 1 and the side cavity wall of the accommodating cavity. In the illustrated embodiment, the first sealing ring 19 is specifically arranged between the limiting groove of the outer periphery of the moving iron core 1 and the side wall of the sleeve 2, and the second sealing ring 20 is specifically arranged between the outer periphery of the moving iron core 1 and the side wall of the valve core 4.

[0022] The first sealing ring 19 and the second sealing ring 20 are arranged in sequence along the axial direction, and in the illustrated view, the first sealing ring 19 is above and the second sealing ring 20 is below.

[0023] Since the first elastic member 14 is arranged between the moving iron core 1 and the upper cavity wall of the accommodating cavity, the second elastic member 15 is arranged between the moving iron core 1 and the lower cavity wall of the accommodating cavity, the first sealing ring 19 and the second sealing ring 20 are arranged between the outer periphery of the moving iron core 1 and the side cavity wall of the accommodating cavity, and the first sealing ring 19 and the second sealing ring 20 are arranged in sequence along the axial direction, the moving iron core 1 will not contact the upper cavity wall of the accommodating cavity when moving upward, will not contact the lower cavity wall of the accommodating cavity when moving downward, and will not contact the side cavity wall of the accommodating cavity during movement, thereby avoiding noise caused by the contact between the moving iron core 1 and the cavity wall of the accommodating cavity, and thus the working noise can be relatively reduced.

[0024] More specifically, as shown in Figure 1 , the moving iron core 1 and the upper cavity wall of the accommodating cavity form an A cavity, and the moving iron core 1 and the lower cavity wall of the accommodating cavity form a B cavity. The moving iron core 1 is provided with an iron core through hole 1a extending substantially along the axial direction, and the iron core through hole 1a communicates the A cavity and the B cavity. When the moving iron core 1 moves upward, the medium in the A cavity will flow to the B cavity through the iron core through hole 1a, and when the moving iron core 1 moves downward, the medium in the B cavity will flow to the A cavity through the iron core through hole 1a. Since the extension direction of the iron core through hole 1a is basically consistent with the moving direction of the moving iron core 1, the resistance generated by the medium flowing in the iron core through hole 1a to the moving iron core 1 is relatively small, and the noise is also relatively small.

[0025] More specifically, the moving iron core 1 includes a large-diameter section 1b and a small-diameter section 1c (see Figure 3 and Figure 4 ), and the outer diameter D1 of the large-diameter section 1b is greater than the outer diameter D2 of the small-diameter section 1c. As shown in Figure 1 and Figure 2 , the first sealing ring 19 is sealingly arranged between the outer periphery of the large-diameter section 1b and the side cavity wall of the accommodating cavity. The second sealing ring 20 is sealingly arranged between the outer periphery of the small-diameter section 1c and the side cavity wall of the accommodating cavity. A G cavity is formed between the first sealing ring 19 and the second sealing ring 20 and between the outer periphery of the moving iron core 1 and the side cavity wall of the accommodating cavity. In this way, the volume of the G cavity can change with the movement of the moving iron core 1, and when the moving iron core 1 moves upward by a distance L, the volume of the G cavity increases{D3 2 -(D2) 2Lπ / 4, wherein D3 is the inner diameter of the side cavity wall of the accommodating cavity corresponding to the region of the small-diameter section 1c of the moving iron core 1, and D2 is the outer diameter of the small-diameter section 1c of the moving iron core 1.

[0026] More specifically, as shown in Figure 2 , the first sealing ring 19 is limited to the moving iron core 1. In the illustrated embodiment, the outer periphery of the large-diameter section 1b of the moving iron core 1 is provided with a limiting groove 1d (see Figure 3 and Figure 4 ), and the first sealing ring 19 is limited to the limiting groove 1d. When the first sealing ring 19 is limited to the moving iron core 1, the first sealing ring 19 can move together with the moving iron core 1.

[0027] Alternatively, the first sealing ring 19 can also be limited to the side cavity wall of the accommodating cavity, for example, a limiting groove can be provided on the inner periphery of the side wall of the sleeve 2, and the first sealing ring 19 is limited to the limiting groove. The first sealing ring 19 can also be arranged between the sleeve 2 and the bushing 3. When the first sealing ring 19 is limited to the side cavity wall of the accommodating cavity, the first sealing ring 19 does not move when the moving iron core 1 moves.

[0028] More specifically, as shown in Figure 2 , the second sealing ring 20 is limited to the side cavity wall of the accommodating cavity. In the illustrated embodiment, the upper end of the valve core 4 is provided with a limiting step 4c (see Figures 5-8 ), and the second sealing ring 20 is limited between the lower end surface of the bushing 3 and the limiting step 4c.

[0029] More specifically, as shown in Figure 1 , the electromagnetic pump is provided with an inlet 2a, a valve port 4a and a C cavity. The inlet 2a is in communication with the A cavity. The C cavity is in communication with the G cavity. The C cavity can also be in communication with the B cavity through the valve port 4a. In the illustrated embodiment, the valve port 4a and the C cavity are arranged on the valve core 4, and the inlet 2a is arranged on the sleeve 2.

[0030] More specifically, as shown in Figure 1 , the electromagnetic pump further comprises a first opening and closing member 5 and a third elastic member 16. The first opening and closing member 5 is used to open and close the valve port 4a. In the illustrated embodiment, the first opening and closing member 5 is a spherical structure, and the third elastic member 16 is located on the side of the first opening and closing member 5 away from the valve port 4a (the lower side in the figure), which can provide a restoring force to the first opening and closing member 5 to reset the first opening and closing member 5 to a position sealing the valve port 4a. The first opening and closing member 5 is at least partially located in the C cavity.

[0031] More specifically, as shown in Figure 2 , the electromagnetic pump is further provided with an outlet 7a and a D cavity. The D cavity can be in communication with the C cavity through the outlet 7a. In the illustrated embodiment, the electromagnetic pump comprises an outlet pipe 7, and the outlet 7a and the D cavity are arranged on the outlet pipe 7.

[0032] More specifically, as shown in Figure 2As shown, the electromagnetic pump further comprises a second opening and closing member 6 and a fourth elastic member 17. The second opening and closing member 6 is used to open and close the outlet 7a. In the illustrated embodiment, one end of the second opening and closing member 6 close to the outlet 7a is in a spherical structure, and the other end of the second opening and closing member 6 away from the outlet 7a is in a cylindrical structure. The fourth elastic member 17 is located on the side (lower side in the figure) of the second opening and closing member 6 away from the outlet 7a, and can provide a restoring force to the second opening and closing member 6, so that the second opening and closing member 6 is restored to the position of sealing the outlet 7a. The second opening and closing member 6 is at least partially located in the D cavity.

[0033] More specifically, the electromagnetic pump further comprises a magnetic conducting assembly, a coil assembly and a shell 13. The magnetic conducting assembly is sleeved outside the sleeve 2, and comprises an upper magnetic conducting sleeve 10, a lower magnetic conducting sleeve 11 and a magnetic shielding ring 12 arranged between the upper magnetic conducting sleeve 10 and the lower magnetic conducting sleeve 11. The coil assembly is sleeved outside the magnetic conducting assembly, and is located in the shell 13. The coil assembly comprises a coil 8 and a coil skeleton 9.

[0034] More specifically, the outlet pipe 7 is fixedly connected with the shell 13. In the illustrated embodiment, the outlet pipe 7 is connected with the shell 13 through a threaded fastener.

[0035] More specifically, the electromagnetic pump further comprises a third sealing ring 21 and a fourth sealing ring 22. The third sealing ring 21 is arranged between the magnetic conducting assembly and the sleeve 2. In the illustrated embodiment, the third sealing ring 21 is specifically arranged between the lower end surface of the lower magnetic conducting sleeve 11 and the upper end surface of the boss on the outer periphery of the sleeve 2. The fourth sealing ring 22 is arranged between the sleeve 2 and the outlet pipe 7. In the illustrated embodiment, the fourth sealing ring 22 is specifically arranged between the limiting groove on the upper end of the outlet pipe 7 and the lower end surface of the boss on the outer periphery of the sleeve 2.

[0036] The working process of the above-mentioned electromagnetic pump is as follows:

[0037] When the coil 8 is energized, the moving iron core 1 moves upward under the action of electromagnetic force, compresses the first elastic member 14, the volume of the A cavity decreases, the volume of the G cavity increases, which causes the pressure of the B cavity communicated with the A cavity to increase and the pressure of the C cavity communicated with the G cavity to decrease, thereby generating a downward differential pressure acting force on the first opening and closing member 5, so that the first opening and closing member 5 opens the valve port 4a, and generating an upward differential pressure acting force on the second opening and closing member 6, so that the second opening and closing member 6 closes the outlet 7a. At this time, the medium enters the A cavity from the inlet 2a, and then enters the C cavity through the iron core through hole 1a, the B cavity and the valve port 4a.

[0038] When the coil 8 is powered off, the moving iron core 1 is reset downward under the elastic force of the first elastic member 14, the volume of the B cavity increases, the volume of the G cavity decreases, the pressure of the B cavity decreases, the pressure of the C cavity connected with the G cavity increases, thus an upward differential pressure force is generated on the first opening and closing member 5 to make the first opening and closing member 5 close the valve port 4a, and a downward differential pressure force is generated on the second opening and closing member 6 to make the second opening and closing member 6 open the outlet 7a, at this time, the medium is discharged from the C cavity through the outlet 7a.

[0039] Through half-wave rectification, the current can be turned on and off for more than fifty times per second, so that the medium can be continuously pumped.

[0040] More specifically, as shown in Figure 2 , at least part of the bushing 3 and the valve core 4 are located in the outlet pipe 7, there is an annular gap E between the outer periphery of the bushing 3 and the outer periphery of the valve core 4 and the outlet pipe 7, the valve core 4 is provided with a valve core passage 4b, the valve core passage 4b communicates the annular gap E and the C cavity, and the bushing 3 is provided with a bushing passage 3a, the bushing passage 3a communicates the annular gap E and the G cavity, so that the C cavity can communicate with the G cavity through the valve core passage 4b, the annular gap E and the bushing passage 3a.

[0041] As shown in Figure 5 and Figure 6 , in this embodiment, the valve core 4 is provided with a large diameter part 4e and a small diameter part 4d, the outer diameter of the large diameter part 4e is larger than that of the small diameter part 4d, so that the annular gap E can be formed between the outer periphery of the small diameter part 4d and the outlet pipe 7. The valve core 4 is provided with a radial through hole, the radial through hole forms the above-mentioned valve core passage 4b, both ends of the radial through hole directly communicate with the annular gap E, and the middle part of the radial through hole communicates with the C cavity. Two radial through holes are provided in the figure, and the extension directions of the two radial through holes are perpendicular to each other.

[0042] As shown in Figure 7 and Figure 8 , in this embodiment, the valve core 4 is provided with a large diameter part 4e and a small diameter part 4d, the outer diameter of the large diameter part 4e is larger than that of the small diameter part 4d, so that the annular gap E can be formed between the outer periphery of the small diameter part 4d and the outlet pipe 7. The outer periphery of the large diameter part 4e is provided with an axial groove 4f, and the upper end of the axial groove 4f communicates with the annular gap E. The valve core 4 is provided with a radial through hole, the radial through hole forms the above-mentioned valve core passage 4b, both ends of the radial through hole respectively communicate with the axial grooves 4f on the corresponding sides, and then indirectly communicate with the annular gap E through the axial grooves 4f on the corresponding sides.

[0043] As shown in Figure 9As shown in the figure, in this embodiment, the bush 3 is provided with a large-diameter sleeve portion 3b and a small-diameter sleeve portion 3c, the outer diameter of the large-diameter sleeve portion 3b is larger than that of the small-diameter sleeve portion 3c, so as to form the annular gap E between the outer periphery of the small-diameter sleeve portion 3c and the outlet pipe 7. The bush 3 is provided with a through hole forming the bush passage 3a, one end of the through hole is penetrated to the outer peripheral surface of the bush 3 so as to communicate with the annular gap E, and the other end of the through hole is penetrated to the inner peripheral surface of the bush 3 so as to communicate with the G cavity.

[0044] As shown in the figure, in this embodiment, the bush 3 is provided with a large-diameter sleeve portion 3b and a small-diameter sleeve portion 3c, the outer diameter of the large-diameter sleeve portion 3b is larger than that of the small-diameter sleeve portion 3c, so as to form the annular gap E between the outer periphery of the small-diameter sleeve portion 3c and the outlet pipe 7. The bush 3 is provided with a through hole forming the bush passage 3a, one end of the through hole is penetrated to the outer peripheral surface of the bush 3 so as to communicate with the annular gap E, and the other end of the through hole is penetrated to the inner peripheral surface of the bush 3 so as to communicate with the G cavity. Figure 10

[0045] The above describes the principles and implementation manners of the present application by using specific examples, and the above embodiment is only used to help understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.​

Claims

1. An electromagnetic pump, characterized by The electromagnetic pump is provided with a containing cavity, and comprises a moving iron core (1), a first elastic member (14), a second elastic member (15), a first sealing ring (19) and a second sealing ring (20), the moving iron core (1) is located in the containing cavity and can move axially in the containing cavity, the first elastic member (14) is arranged between the moving iron core (1) and the upper cavity wall of the containing cavity, the second elastic member (15) is arranged between the moving iron core (1) and the lower cavity wall of the containing cavity, and the first sealing ring (19) and the second sealing ring (20) are sealingly arranged between the outer periphery of the moving iron core (1) and the side cavity wall of the containing cavity and are arranged axially.

2. The electromagnetic pump of claim 1, wherein, An A cavity is formed between the moving iron core (1) and the upper cavity wall of the containing cavity, a B cavity is formed between the moving iron core (1) and the lower cavity wall of the containing cavity, the moving iron core (1) is provided with an iron core through hole (1a) extending substantially axially, and the iron core through hole (1a) communicates the A cavity and the B cavity.

3. The electromagnetic pump of claim 2, wherein, The moving iron core (1) comprises a large-diameter section (1b) and a small-diameter section (1c), the outer diameter of the large-diameter section (1b) is larger than that of the small-diameter section (1c), the first sealing ring (19) is sealingly arranged between the outer periphery of the large-diameter section (1b) and the side cavity wall of the containing cavity, the second sealing ring (20) is sealingly arranged between the outer periphery of the small-diameter section (1c) and the side cavity wall of the containing cavity, and a G cavity is formed between the first sealing ring (19) and the second sealing ring (20) and between the outer periphery of the moving iron core (1) and the side cavity wall of the containing cavity.

4. The electromagnetic pump of claim 3, wherein, The first sealing ring (19) is limited to the outer periphery of the large-diameter section (1b) of the moving iron core (1) or to the side cavity wall of the containing cavity, and the second sealing ring (20) is limited to the side cavity wall of the containing cavity.

5. The electromagnetic pump of claim 3, wherein, The electromagnetic pump is provided with an inlet (2a), a valve port (4a) and a C cavity, the inlet (2a) communicates with the A cavity, the electromagnetic pump comprises a first opening and closing member (5) for opening and closing the valve port (4a) and a third elastic member (16) for providing a restoring force to the first opening and closing member (5), at least part of the first opening and closing member (5) is located in the C cavity, the C cavity communicates with the G cavity, and the C cavity can also communicate with the B cavity through the valve port (4a).

6. The electromagnetic pump of claim 5, wherein, The electromagnetic pump is provided with an outlet (7a), the electromagnetic pump comprises a second opening and closing member (6) for opening and closing the outlet (7a) and a fourth elastic member (17) for providing a restoring force to the second opening and closing member (6), at least part of the second opening and closing member (6) is located in the D cavity, and the D cavity can communicate with the C cavity through the outlet (7a).

7. The electromagnetic valve according to claim 6, characterized by The electromagnetic pump comprises a sleeve (2), a bushing (3), a valve core (4) and an outlet pipe (7), the sleeve (2), the bushing (3) and the valve core (4) are sequentially arranged in the axial direction, the sleeve (2), the bushing (3) and the valve core (4) are constructed to form the accommodating cavity, the valve port (4a) and the C cavity are arranged in the valve core (4), the inlet (2a) is arranged in the sleeve (2), the outlet (7a) and the D cavity are arranged in the outlet pipe (7).

8. The electromagnetic valve according to claim 7, characterized by At least part of the bushing (3) and the valve core (4) are located in the outlet pipe (7), the annular gap (E) is formed between the outer periphery of the bushing (3) and the outer periphery of the valve core (4) and the outlet pipe (7), the valve core (4) is provided with a valve core channel (4b), the bushing (3) is provided with a bushing channel (3a), the valve core channel (4b) is communicated with the annular gap (E) and the C cavity, and the bushing channel (3a) is communicated with the annular gap (E) and the G cavity.

9. The electromagnetic pump of claim 8, wherein, The valve core (4) is provided with a radial through hole, the radial through hole forms the valve core channel (4b), and two ends of the radial through hole are directly communicated with the annular gap (E) or communicated with the annular gap (E) through the axial groove (4f) arranged on the outer periphery of the valve core (4).

10. The electromagnetic pump of claim 8, wherein, The bushing (3) is provided with a through hole and / or a through slot, the through hole and / or the through slot form the bushing channel (3a), the through hole and the through slot pass through the inner periphery surface and the outer periphery surface of the bushing (3), and the through slot is provided with a side opening at the lower end surface of the bushing (3).

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