Silent electromagnetic plunger metering pump

Abstract

The invention discloses a silent electromagnetic plunger metering pump which comprises a pump body, a plunger assembly and an electromagnetic control device. The electromagnetic control device fixes the positioning ring in the first mounting groove, the electromagnetic control device comprises a movable iron core, a fixed iron core and an elastic piece, the movable iron core is connected to the buffer heat insulation ring, an annular placement groove is formed in the end, close to the movable iron core, of the fixed iron core, and a buffer gasket protruding out of the annular placement groove is arranged in the annular placement groove; the elastic piece is arranged on the periphery of the buffering heat insulation ring, and the two ends of the elastic piece abut against the end, close to the plunger moving groove, of the buffering heat insulation ring and the end, close to the positioning ring, of the electromagnetic control device respectively. The arrangement of the annular placement groove can avoid excessive reduction of the area of magnetic flux, the buffer gasket plays a role in buffering and vibration absorption when the movable iron core and the fixed iron core work, noise can be reduced, the position of the elastic piece is separated from the position between the fixed iron core and the movable iron core, it can be ensured that the magnetic force between the fixed iron core and the movable iron core meets the requirement for overall normal operation, and the structural design is ingenious.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic metering pump technology, in particular to a silent electromagnetic plunger metering pump. Background Art

[0002] At present, there are two main types of electromagnetic metering pumps at home and abroad: rubber diaphragm type and ceramic plunger type. They are composed of electromagnet components, adjusting nuts, ceramic plungers or diaphragms, springs, valve bodies and other parts. The ceramic plunger type has higher precision and is more stable than the rubber diaphragm type.

[0003] In the prior art, a high-precision micro-electromagnetic metering pump is disclosed, and its electromagnet assembly includes a fixed iron core and a moving iron core. When working, the moving iron core collides with the fixed iron core hard, which generates a large noise. It cannot be used in an environment with noise requirements. The collision easily causes the moving iron core and the fixed iron core to wear, thereby reducing the service life. Under this structure, an end of the fixed iron core close to the moving iron core is recessed with an installation groove for accommodating a spring. The spring can drive the moving iron core to reset to achieve the discharge of the metering pump. In order to achieve collision buffering between the moving iron core and the fixed iron core, although a placement groove can be opened in the fixed iron core to place a buffer pad, opening the installation groove and the placement groove at the same time will reduce the area of ​​the magnetic flux, resulting in a decrease in the magnetic force between the moving iron core and the fixed iron core. It is easy for the moving iron core to be difficult to overcome the elastic force of the spring and fit the fixed iron core, affecting the normal use of the metering pump.

[0004] Therefore, it is necessary to design a new technical solution to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a silent electromagnetic plunger metering pump, wherein an annular placement groove is opened at one end of the fixed iron core close to the moving iron core, and a buffer gasket protruding from the annular placement groove is arranged in the annular placement groove. The arrangement of the annular placement groove can avoid excessively reducing the area of ​​the magnetic flux, and has a buffering and vibration-absorbing effect when the moving iron core and the fixed iron core are working, which can effectively reduce the noise of the metering pump when it is working and improve the life of the metering pump. At the same time, an elastic member is arranged on the outer periphery of the buffer insulation ring, and the two ends of the elastic member respectively abut against one end of the buffer insulation ring close to the plunger movable groove and one end of the electromagnetic control device close to the positioning ring, so that the position of the elastic member is separated from between the fixed iron core and the moving iron core, avoiding further reducing the area of ​​the magnetic flux, ensuring that the magnetic force between the fixed iron core and the moving iron core meets the overall normal operation, and the structural design is ingenious. In addition, the arrangement of the buffer insulation ring can prevent the heat of the moving iron core from being transferred to the plunger rod on the one hand, and prevent the plunger rod from hitting the pump body too quickly on the other hand.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A silent electromagnetic plunger metering pump, comprising:

[0008] A pump body, wherein the pump body is provided with a first installation groove and a quantitative channel, and a plunger movable groove is passed between the first installation groove and the quantitative channel;

[0009] A plunger assembly, the plunger assembly comprising a positioning ring, a buffer heat-insulating ring, and a plunger rod, the positioning ring being arranged in a first mounting groove, the positioning ring being provided with a receiving groove and a first through hole communicating with the receiving groove for the plunger rod to pass through, the buffer heat-insulating ring being arranged in the receiving groove, the end of the buffer heat-insulating ring close to the plunger movable groove being provided with a second mounting groove, the plunger rod being arranged in the second mounting groove, the end of the plunger rod close to the plunger movable groove extending into the plunger movable groove through the first through hole, and a sealing assembly being arranged between the outer periphery of the plunger rod and the plunger movable groove;

[0010] An electromagnetic control device, which fixes a positioning ring in a first mounting groove. The electromagnetic control device includes a moving iron core, a fixed iron core and an elastic member. The moving iron core is connected to a buffer heat insulation ring. An annular placement groove is provided at one end of the fixed iron core close to the moving iron core. A buffer gasket protruding from the annular placement groove is provided in the annular placement groove. The elastic member is provided on the outer periphery of the buffer heat insulation ring. Two ends of the elastic member respectively abut against one end of the buffer heat insulation ring close to the plunger movable groove and one end of the electromagnetic control device close to the positioning ring. The elastic member can drive the buffer heat insulation ring to move toward the plunger movable groove and thereby drive the plunger rod to move in the plunger movable groove.

[0011] As a preferred embodiment, the electromagnetic control device also includes a pressure plate, a skeleton, a coil, and an iron shell. The pressure plate is fixed on the pump body and is used to fix the positioning ring in the first mounting groove. The iron shell is fixed on the pressure plate and fixes the skeleton in the iron shell. The skeleton includes an inner cavity and an outer cavity separated from the inner cavity. The moving iron core is movably arranged at one end of the inner cavity close to the pump body, the fixed iron core is arranged at one end of the inner cavity away from the pump body, and the coil is arranged in the outer cavity.

[0012] As a preferred embodiment, the pressure plate is provided with a second through hole for the moving iron core to pass through, and an annular protrusion is convexly provided on the outer periphery of the second through hole at one end of the pressure plate close to the pump body, and correspondingly, the positioning ring is recessed with an annular groove matching the annular protrusion, and the annular protrusion is clamped in the annular groove.

[0013] As a preferred embodiment, the electromagnetic control device also includes an adjusting nut, and the end of the fixed iron core away from the moving iron core extends out of the iron shell and is provided with a threaded portion. The adjusting nut is connected to the threaded portion and is used to adjust the position of the fixed iron core in the inner cavity.

[0014] As a preferred solution, an abutment portion is provided on the outer periphery of one end of the buffer heat-insulating ring close to the plunger movable groove, and two ends of the elastic member abut against the abutment portion and the electromagnetic control device respectively.

[0015] As a preferred embodiment, the outer periphery of the abutment portion is provided with two adjacent or oppositely arranged first rotation limiting surfaces, and correspondingly, the wall surface of the accommodating groove is provided with two second rotation limiting surfaces corresponding to the first rotation limiting surfaces, and the wall surface of the accommodating groove is provided with avoidance grooves on both sides of the second rotation limiting surface for preventing interference between the first rotation limiting surface and the second rotation limiting surface.

[0016] As a preferred solution, the positioning hole is formed on the outer periphery of the positioning ring and the wall surface of the first mounting groove, and a positioning pin is inserted into the positioning hole for limiting the rotation of the positioning ring relative to the first mounting groove.

[0017] As a preferred solution, a protruding column is provided at one end of the moving iron core away from the fixed iron core, and correspondingly, a recess matching the protruding column is provided at one end of the buffer heat insulation ring close to the moving iron core, and the recess is clamped in the protruding column. The moving iron core is provided with a positioning groove on the outer periphery of the protruding column, and correspondingly, the buffer heat insulation ring is provided with a positioning convex portion matching the positioning groove, and the positioning convex portion is clamped in the positioning groove. The end of the buffer heat insulation ring close to the moving iron core is fixed to the end of the moving iron core away from the fixed iron core by structural adhesive.

[0018] As a preferred embodiment, the sealing assembly includes an O-ring and a sealing ring, the sealing ring having a through hole, the sealing ring being respectively provided with a first annular extension portion and a second annular extension portion extending from both ends of the through hole, the wall surface of the plunger movable groove being provided with a three-stage stepped groove, the positioning ring and the plunger rod together fix the sealing ring to a section of the three-stage stepped groove close to the positioning ring, the plunger rod fixes the first annular extension portion to a section of the three-stage stepped groove away from the positioning ring, the sealing ring and the first annular extension portion fix the O-ring to the middle section of the three-stage stepped groove, and the plunger rod fixes the second annular extension portion to the first through hole.

[0019] As a preferred solution, a valve body mounting portion is extended from the side of the pump body, a three-way valve is arranged on the valve body mounting portion, the quantitative passage comprises a transverse section and a first vertical section and a second vertical section connected to the transverse section, the transverse section runs through the valve body mounting portion, the valve body mounting portion is provided with a plug for blocking the end of the transverse section, the plunger movable groove is arranged at one end of the second vertical section away from the transverse section, the end of the first vertical section away from the transverse section is provided with a suction and discharge port, and the valve body mounting portion is also provided with a first liquid inlet channel and a first liquid outlet channel;

[0020] The three-way valve is provided with a main channel and a second liquid inlet channel and a second liquid outlet channel which can be connected with the main channel. The main channel is connected with the suction and discharge port, the second liquid inlet channel is connected with the first liquid inlet channel, and the second liquid outlet channel is connected with the first liquid outlet channel.

[0021] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0022] Mainly, an annular placement groove is opened at one end of the fixed iron core close to the moving iron core, and a buffer gasket protruding from the annular placement groove is arranged in the annular placement groove. The setting of the annular placement groove can avoid reducing the area of ​​the magnetic flux too much, and has the effect of buffering and absorbing vibration when the moving iron core and the fixed iron core are working, which can effectively reduce the noise of the metering pump when it is working and improve the life of the metering pump. At the same time, an elastic member is arranged on the outer periphery of the buffer insulation ring, and the two ends of the elastic member respectively abut against one end of the buffer insulation ring close to the plunger movable groove and one end of the electromagnetic control device close to the positioning ring, so that the position of the elastic member is separated from between the fixed iron core and the moving iron core, avoiding further reduction of the area of ​​the magnetic flux, ensuring that the magnetic force between the fixed iron core and the moving iron core meets the overall normal operation, and the structural design is ingenious. In addition, the setting of the buffer insulation ring can prevent the heat of the moving iron core from being transferred to the plunger rod on the one hand, and prevent the plunger rod from hitting the pump body too quickly on the other hand.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of a preferred embodiment of the present invention;

[0025] Figure 2 It is an exploded schematic diagram of a preferred embodiment of the present invention;

[0026] Figure 3 It is a cross-sectional schematic diagram of a preferred embodiment of the present invention;

[0027] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 is another cross-sectional schematic diagram of a preferred embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of the assembly of the plunger assembly of the preferred embodiment of the present invention.

[0030] Description of the accompanying drawings:

[0031] 10. Pump body 11. Valve body installation part

[0032] 12. Plug 101, first installation groove

[0033] 102, suction and discharge port 103, quantitative channel

[0034] 1031, transverse section 1032, first vertical section

[0035] 1033, second vertical section 104, plunger movable groove

[0036] 105, first liquid inlet channel 106, first liquid outlet channel

[0037] 107, three-stage stepped groove 20, three-way valve

[0038] 201, main channel 202, second liquid inlet channel

[0039] 203, second liquid outlet channel 30, electromagnetic control device

[0040] 31. Moving iron core 311. convex column

[0041] 312, positioning groove 32, fixed iron core

[0042] 321, annular placement groove 322, threaded portion

[0043] 33. Elastic member 34. Pressing plate

[0044] 341, second via hole 342, annular convex portion

[0045] 35. Skeleton 351. Inner cavity

[0046] 352, outer cavity 36, coil

[0047] 37. Iron shell 38. Adjusting nut

[0048] 40. Plunger assembly

[0049] 41. Positioning ring 411. Accommodating groove

[0050] 412, first via hole 413, annular groove

[0051] 42. Buffer insulation ring

[0052] 421, second installation groove 422, recess

[0053] 423, positioning protrusion 424, plug hole

[0054] 425, first glue injection hole 426, second glue injection hole

[0055] 427. Contact part

[0056] 43. plunger rod 431. annular groove

[0057] 50. Buffer washer 60. Pump housing

[0058] 70. Sealing assembly 71. O-ring

[0059] 72. Sealing ring 721. Through hole

[0060] 722, first annular extension portion 723, second annular extension portion

[0061] 81. Positioning hole 82. Positioning pin

[0062] 83. First rotation limiting surface 84. Second rotation limiting surface

[0063] 85. Avoid empty slot. DETAILED DESCRIPTION

[0064] First of all, it should be noted that in the description of the present invention, the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0065] Please refer to Figures 1 to 6 As shown, it shows the specific structure of a preferred embodiment of the present invention, including a pump body 10, a three-way valve 20, an electromagnetic control device 30 and a plunger assembly 40.

[0066] The pump body 10 is provided with a first installation groove 101 and a suction and discharge port 102, and the pump body 10 is provided with a quantitative channel 103 connected to the suction and discharge port 102, and the end of the quantitative channel 103 away from the suction and discharge port 102 is connected to the first installation groove 101 through a plunger movable groove 104, and the pump body 10 is also provided with a first liquid inlet channel 105 and a first liquid outlet channel 106;

[0067] See also Figure 2 , Figure 3 and Figure 5As shown, specifically, a valve body mounting portion 11 is extended from the side of the pump body 10, the quantitative channel 103 includes a transverse section 1031 and a first vertical section 1032 and a second vertical section 1033 connected to the transverse section 1031, the transverse section 1031 passes through the valve body mounting portion 11, and the arrangement of the transverse section 1031 passing through the valve body mounting portion 11 facilitates the processing and manufacturing of the transverse section 1031, the valve body mounting portion 11 is provided with a plug 12 for blocking the end of the transverse section 1031, the suction and discharge port 102 is arranged at one end of the first vertical section 1032 away from the transverse section 1031, the first liquid inlet channel 105 and the first liquid outlet channel 106 are respectively arranged on both sides of the first vertical section 1032, and the plunger movable groove 104 is arranged at one end of the second vertical section 1033 away from the transverse section 1031;

[0068] The three-way valve 20 is fixed to the bottom of the valve body mounting portion 11. The three-way valve 20 is parallel to the pump body 10. The three-way valve 20 is provided with a main channel 201 and a second liquid inlet channel 202 and a second liquid outlet channel 203 which can be connected to the main channel 201. The main channel 201 is connected to the suction and discharge port 102, the second liquid inlet channel 202 is connected to the first liquid inlet channel 105, and the second liquid outlet channel 203 is connected to the first liquid outlet channel 106, which can be used for switching of suction and discharge to achieve quantitative metering.

[0069] The plunger assembly 40 includes a positioning ring 41, a buffer heat-insulating ring 42, and a plunger rod 43. The positioning ring 41 is arranged in the first installation groove 101. The positioning ring 41 is provided with a receiving groove 411 and a first through hole 412 communicating with the receiving groove 411 for the plunger rod 43 to pass through. The buffer heat-insulating ring 42 is arranged in the receiving groove 411. The buffer heat-insulating ring 42 can be made of rubber material. The end of the buffer heat-insulating ring 42 away from the moving iron core 31 is provided with a second installation groove 421. The plunger rod 43 is arranged in the second installation groove 421. The plunger rod 43 can be a ceramic plunger rod 43. The end of the plunger rod 43 away from the buffer heat-insulating ring 42 passes through the first through hole 412 and extends into the plunger movable groove 104. A sealing assembly 70 is arranged between the outer periphery of the plunger rod 43 and the plunger movable groove 104.

[0070] The electromagnetic control device 30 fixes the positioning ring 41 in the first installation groove 101. The electromagnetic control device 30 includes a moving iron core 31, a fixed iron core 32 and an elastic member 33. The moving iron core 31 is connected to the buffer heat insulation ring 42. An annular placement groove 321 is provided at one end of the fixed iron core 32 close to the moving iron core 31. A buffer gasket 50 protruding from the annular placement groove 321 is provided in the annular placement groove 321. The elastic member 33 is arranged on the outer periphery of the buffer heat insulation ring 42. The two ends of the elastic member 33 respectively abut against one end of the buffer heat insulation ring 42 close to the plunger movable groove 104 and one end of the electromagnetic control device 30 close to the positioning ring 41. The elastic member 33 can drive the buffer heat insulation ring 42 to move toward the plunger movable groove 104 and then drive the plunger rod 43 to move in the plunger movable groove 104. The elastic member 33 can be a spring.

[0071] See also Figure 3 As shown, specifically, the electromagnetic control device 30 also includes a pressing plate 34, a skeleton 35, a coil 36, and an iron shell 37. The pressing plate 34 is fixed on the pump body 10 and is used to fix the positioning ring 41 in the first mounting groove 101. The iron shell 37 is fixed on the pressing plate 34 and fixes the skeleton 35 in the iron shell 37. The skeleton 35 includes an inner cavity 351 and an outer cavity 352 separated from the inner cavity 351. The moving iron core 31 is movably arranged at one end of the inner cavity 351 close to the pump body 10, the fixed iron core 32 is arranged at one end of the inner cavity 351 away from the pump body 10, and the coil 36 is arranged in the outer cavity 352;

[0072] Preferably, the electromagnetic control device 30 further includes an adjusting nut 38. One end of the fixed iron core 32 away from the moving iron core 31 extends out of the iron shell 37 and is provided with a threaded portion 322. The adjusting nut 38 is connected to the threaded portion 322 and is used to adjust the position of the fixed iron core 32 in the inner cavity 351, so as to adjust the suction and discharge volume. The outer cover of the iron shell 37 is provided with a pump housing 60, and the adjusting nut 38 is exposed at the bottom of the pump housing 60.

[0073] The pressure plate 34 is provided with a second through hole 341 for the moving iron core 31 to pass through, and an annular convex portion 342 is convexly provided on the outer periphery of the second through hole 341 at one end of the pressure plate 34 close to the pump body 10, and correspondingly, the positioning ring 41 is concavely provided with an annular groove 413 matching the annular convex portion 342, and the annular convex portion is clamped in the annular groove 413;

[0074] An abutment portion 427 is disposed on the outer periphery of one end of the buffer heat-insulating ring 42 close to the plunger movable groove 104 , and two ends of the elastic member 33 abut against the abutment portion 427 and the pressure plate 34 , respectively.

[0075] See also Figure 2 and Figure 6As shown, the outer periphery of the positioning ring 41 and the wall surface of the first mounting groove 101 are provided with positioning holes 81, and a positioning pin 82 is inserted into the positioning hole 81, and the positioning pin 82 can limit the rotation of the positioning ring 41 relative to the first mounting groove 101;

[0076] The outer periphery of the abutment portion 427 is provided with two first rotation limiting surfaces 83 arranged oppositely or adjacently, and correspondingly, the wall surface of the accommodating groove 411 is provided with two second rotation limiting surfaces 84 arranged corresponding to the first rotation limiting surfaces 83, and the first rotation limiting surfaces 83 and the second rotation limiting surfaces 84 can limit the rotation of the buffer heat-insulating ring 42 relative to the accommodating groove 411, and the wall surface of the accommodating groove 411 is provided with avoidance grooves 85 on both sides of the second rotation limiting surfaces 84 for preventing the first rotation limiting surfaces 83 from interfering with the second rotation limiting surfaces 84; the setting of limiting the rotation of the positioning ring 41 relative to the first mounting groove 101, and limiting the rotation of the buffer heat-insulating ring 42 relative to the accommodating groove 411 can ensure that the plunger rod hits the same position of the plunger active groove each time, making the metering more accurate, and at the same time can reduce the flatness processing requirements of the metering pump, thereby reducing the production cost; in this embodiment, there are two first rotation limiting surfaces 83 arranged oppositely and symmetrically.

[0077] See also Figure 3 As shown, the end of the moving iron core 31 away from the fixed iron core 32 is convexly provided with a convex column 311, and correspondingly, the end of the buffer heat insulation ring 42 close to the moving iron core 31 is concavely provided with a concave position 422 matching the convex column 311, and the concave position 422 is clamped in the convex column 311, and the moving iron core 31 is provided with a positioning groove 312 on the outer periphery of the convex column 311, and correspondingly, the buffer heat insulation ring 42 is provided with a positioning convex portion 423 matching the positioning groove 312, and the positioning convex portion 423 is clamped in the positioning groove 312, and the end of the buffer heat insulation ring 42 close to the moving iron core 31 is fixed to the moving iron core 31 away from the fixed iron core 31 by structural glue. 2; an annular groove 431 is provided on the periphery of the plunger rod 43, and a plug hole 424 and a first glue injection hole 425 are provided on the periphery of the buffer heat-insulating ring 42, which are connected to the second mounting groove 421 and are arranged corresponding to the annular groove 431; a second glue injection hole 426 corresponding to the bottom of the plunger rod 43 is also provided on the periphery of the buffer heat-insulating ring 42, and a latch is passed through the plug hole 424, and the latch is clamped in the annular groove 431 to complete the positioning of the plunger rod 43 in the second mounting groove 421, and structural glue is filled through the first glue injection hole 425 and the second glue injection hole 426 to complete the fixing of the plunger rod 43 in the second mounting groove 421.

[0078] See also Figure 4As shown, the sealing assembly 70 includes an O-ring 71 and a sealing ring 72, the sealing ring 72 has a through hole 721, and the sealing ring 72 is respectively provided with a first annular extension portion 722 and a second annular extension portion 723 extending from both ends of the through hole 721, the wall surface of the plunger movable groove 104 is provided with a three-stage stepped groove 107, the positioning ring 41 and the plunger rod 43 together fix the sealing ring 72 to a section of the three-stage stepped groove 107 close to the positioning ring 41, the plunger rod 43 fixes the first annular extension portion 722 to a section of the three-stage stepped groove 107 away from the positioning ring 41, the sealing ring 72 and the first annular extension portion 722 fix the O-ring 71 to the middle section of the three-stage stepped groove 107, and the plunger rod 43 fixes the second annular extension portion 723 to the first through hole 412;

[0079] Preferably, the extension length of the first annular extension portion 722 is greater than the extension length of the second annular extension portion 723, and the first annular extension portion 722 is arranged with a small opening at the top and a large opening at the bottom. The first annular extension portion 722 is arranged with a large opening at the top and a small opening at the bottom, and the arrangement of the second annular extension portion 723 can further prevent the reagent from entering the positioning ring 41.

[0080] The working principle of this embodiment is described in detail as follows:

[0081] When a specified current is passed through the coil 36, a magnetic field is generated, and the magnetic field passes through the iron shell 37, the fixed iron core 32 and the moving iron core 31 in sequence to form a magnetic circuit, and finally an electromagnetic force is formed between the fixed iron core 32 and the moving iron core 31, which attracts the moving iron core 31 and drives the plunger rod 43 to move downward, so that a negative pressure is formed in the plunger movable groove 104 of the pump body 10, and the liquid in the quantitative channel 103 is sucked.

[0082] After the liquid is sucked, the coil 36 is powered off, and the moving iron core 31, the buffer insulation ring 42 and the plunger rod 43 are separated from the fixed iron core 32 and move upwards under the restoring force of the elastic member 33 until they are locked against the pump body 10, completing the liquid discharge action.

[0083] The design emphasis of the present invention is:

[0084] Mainly, an annular placement groove is opened at one end of the fixed iron core close to the moving iron core, and a buffer gasket protruding from the annular placement groove is arranged in the annular placement groove. The setting of the annular placement groove can avoid reducing the area of ​​the magnetic flux too much, and has the effect of buffering and absorbing vibration when the moving iron core and the fixed iron core are working, which can effectively reduce the noise of the metering pump when it is working and improve the life of the metering pump. At the same time, an elastic member is arranged on the outer periphery of the buffer insulation ring, and the two ends of the elastic member respectively abut against one end of the buffer insulation ring close to the plunger movable groove and one end of the electromagnetic control device close to the positioning ring, so that the position of the elastic member is separated from between the fixed iron core and the moving iron core, avoiding further reduction of the area of ​​the magnetic flux, ensuring that the magnetic force between the fixed iron core and the moving iron core meets the overall normal operation, and the structural design is ingenious. In addition, the setting of the buffer insulation ring can prevent the heat of the moving iron core from being transferred to the plunger rod on the one hand, and prevent the plunger rod from hitting the pump body too quickly on the other hand.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A silent electromagnetic plunger metering pump, characterized in that: include: A pump body, wherein the pump body is provided with a first installation groove and a quantitative channel, and a plunger movable groove is passed between the first installation groove and the quantitative channel; A plunger assembly, the plunger assembly comprising a positioning ring, a buffer heat-insulating ring, and a plunger rod, the positioning ring being arranged in a first mounting groove, the positioning ring being provided with a receiving groove and a first through hole communicating with the receiving groove for the plunger rod to pass through, the buffer heat-insulating ring being arranged in the receiving groove, the end of the buffer heat-insulating ring close to the plunger movable groove being provided with a second mounting groove, the plunger rod being arranged in the second mounting groove, the end of the plunger rod close to the plunger movable groove extending into the plunger movable groove through the first through hole, and a sealing assembly being arranged between the outer periphery of the plunger rod and the plunger movable groove; An electromagnetic control device, which fixes a positioning ring in a first mounting groove. The electromagnetic control device includes a moving iron core, a fixed iron core and an elastic member. The moving iron core is connected to a buffer heat insulation ring. An annular placement groove is provided at one end of the fixed iron core close to the moving iron core. A buffer gasket protruding from the annular placement groove is provided in the annular placement groove. The elastic member is provided on the outer periphery of the buffer heat insulation ring. Two ends of the elastic member respectively abut against one end of the buffer heat insulation ring close to the plunger movable groove and one end of the electromagnetic control device close to the positioning ring. The elastic member can drive the buffer heat insulation ring to move toward the plunger movable groove and thereby drive the plunger rod to move in the plunger movable groove.

2. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: The electromagnetic control device also includes a pressure plate, a frame, a coil, and an iron shell. The pressure plate is fixed on the pump body and is used to fix the positioning ring in the first mounting groove. The iron shell is fixed on the pressure plate and fixes the frame in the iron shell. The frame includes an inner cavity and an outer cavity separated from the inner cavity. The moving iron core is movably arranged at one end of the inner cavity close to the pump body, the fixed iron core is arranged at one end of the inner cavity away from the pump body, and the coil is arranged in the outer cavity.

3. A silent electromagnetic plunger metering pump according to claim 2, characterized in that: The pressure plate is provided with a second through hole for the moving iron core to pass through, and an annular convex portion is convexly provided on the outer periphery of the second through hole at one end of the pressure plate close to the pump body. Correspondingly, the positioning ring is concavely provided with an annular groove matching the annular convex portion, and the annular convex portion is clamped in the annular groove.

4. A silent electromagnetic plunger metering pump according to claim 2, characterized in that: The electromagnetic control device also includes an adjusting nut. One end of the fixed iron core away from the moving iron core extends out of the iron shell and is provided with a threaded portion. The adjusting nut is connected to the threaded portion and is used to adjust the position of the fixed iron core in the inner cavity.

5. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: An abutment portion is arranged on the outer periphery of one end of the buffer heat-insulating ring close to the plunger movable groove, and two ends of the elastic member abut against the abutment portion and the electromagnetic control device respectively.

6. A silent electromagnetic plunger metering pump according to claim 5, characterized in that: The outer periphery of the abutment portion is provided with two adjacent or oppositely arranged first rotation limiting surfaces, and correspondingly, the wall surface of the accommodating groove is provided with two second rotation limiting surfaces corresponding to the first rotation limiting surfaces, and the wall surface of the accommodating groove is provided with avoidance grooves on both sides of the second rotation limiting surface for preventing interference between the first rotation limiting surface and the second rotation limiting surface.

7. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: The outer periphery of the positioning ring and the wall surface of the first installation groove are provided with the positioning hole, and a positioning pin for limiting the rotation of the positioning ring relative to the first installation groove is inserted into the positioning hole.

8. The silent electromagnetic plunger metering pump according to claim 1, characterized in that: A convex column is convexly provided at one end of the moving iron core away from the fixed iron core, and correspondingly, a concave position matching the convex column is concavely provided at one end of the buffer heat insulation ring close to the moving iron core, and the concave position is clamped in the convex column. The moving iron core is provided with a positioning groove on the outer periphery of the convex column, and correspondingly, the buffer heat insulation ring is provided with a positioning convex portion matching the positioning groove, and the positioning convex portion is clamped in the positioning groove. The end of the buffer heat insulation ring close to the moving iron core is fixed to the end of the moving iron core away from the fixed iron core by structural adhesive.

9. The silent electromagnetic plunger metering pump according to claim 1, characterized in that: The sealing assembly includes an O-ring and a sealing ring, the sealing ring has a through hole, and the sealing ring is respectively extended with a first annular extension portion and a second annular extension portion at both ends of the through hole, and the wall surface of the plunger movable groove is provided with a three-section stepped groove, the positioning ring and the plunger rod together fix the sealing ring to a section of the three-section stepped groove close to the positioning ring, the plunger rod fixes the first annular extension portion to a section of the three-section stepped groove away from the positioning ring, the sealing ring and the first annular extension portion fix the O-ring to the middle section of the three-section stepped groove, and the plunger rod fixes the second annular extension portion to the first through hole.

10. The silent electromagnetic plunger metering pump according to claim 1, characterized in that: A valve body mounting portion is extended from the side of the pump body, a three-way valve is arranged on the valve body mounting portion, the quantitative passage comprises a transverse section and a first vertical section and a second vertical section connected to the transverse section, the transverse section runs through the valve body mounting portion, the valve body mounting portion is provided with a plug for blocking the end of the transverse section, the plunger movable groove is arranged at one end of the second vertical section away from the transverse section, the end of the first vertical section away from the transverse section is provided with a suction and discharge port, and the valve body mounting portion is also provided with a first liquid inlet channel and a first liquid outlet channel; The three-way valve is provided with a main channel and a second liquid inlet channel and a second liquid outlet channel which can be connected with the main channel. The main channel is connected with the suction and discharge port, the second liquid inlet channel is connected with the first liquid inlet channel, and the second liquid outlet channel is connected with the first liquid outlet channel.

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