A silent electromagnetic plunger metering pump

Abstract

The present invention discloses a silent electromagnetic plunger metering pump, comprising a pump body, a plunger assembly, and an electromagnetic control device; the electromagnetic control device fixes a positioning ring in a first mounting groove, the electromagnetic control device comprising 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 near the moving iron core, a buffer washer 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, and the two ends of the elastic member respectively abut against one end of the buffer heat insulation ring near the plunger movable groove and one end of the electromagnetic control device near the positioning ring. The provision of the annular placement groove can avoid excessively reducing the area of ​​magnetic flux; the buffer washer acts as a buffer and absorbs vibrations when the moving iron core and the fixed iron core are in operation, thereby reducing noise; the position of the elastic member is separated from between the fixed iron core and the moving iron core, thereby ensuring that the magnetic force between the fixed iron core and the moving iron core meets the requirements for overall normal operation; and the structural design is ingenious.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic metering pumps, 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, whose electromagnet assembly includes a fixed iron core and a moving iron core. When working, the moving iron core collides with the fixed iron core head-on, generating 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 their service life. Under this structure, an end of the fixed iron core close to the moving iron core is recessed with a mounting groove for accommodating a spring. The spring can drive the moving iron core to reset to achieve liquid 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 mounting groove and the placement groove at the same time will reduce the area of ​​the magnetic flux, resulting in a reduction in the magnetic force between the moving iron core and the fixed iron core. It is easy for the moving iron core to be unable 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 provided 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 provided in the annular placement groove. The setting of the annular placement groove can avoid excessive reduction in the area of ​​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 when the metering pump is working and improve the service 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 as to separate the position of the elastic member from between the fixed iron core and the moving iron core, avoid further reduction in the area of ​​magnetic flux, ensure 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.

[0006] To achieve the above object, 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 mounting groove and a quantitative passage, wherein a plunger movable groove is passed between the first mounting groove and the quantitative passage;

[0009] A plunger assembly, comprising a positioning ring, a buffer heat-insulating ring, and a plunger rod, wherein the positioning ring is disposed in a first mounting groove, the positioning ring is 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 is disposed in the receiving groove, the end of the buffer heat-insulating ring close to the plunger movable groove is provided with a second mounting groove, the plunger rod is disposed in the second mounting groove, the end of the plunger rod close to the plunger movable groove passes through the first through-hole and extends into the plunger movable groove, and a sealing assembly is provided between the outer periphery of the plunger rod and the plunger movable groove;

[0010] An electromagnetic control device, which fixes the positioning ring in the 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 the 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. The 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 solution, 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 solution, the pressure plate is provided with a second through hole for the moving iron core to pass through, and the end of the pressure plate close to the pump body is provided with an annular convex portion on the outer periphery of the second through hole. Correspondingly, the positioning ring is provided with an annular groove matching the annular convex portion, and the annular convex portion is clamped in the annular groove.

[0013] As a preferred solution, the electromagnetic control device also includes an adjusting nut, 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 both ends of the elastic member abut against the abutment portion and the electromagnetic control device respectively.

[0015] As a preferred solution, the outer periphery of the abutment portion is provided with two adjacent or oppositely arranged first rotation limiting surfaces, and accordingly, 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 outer periphery of the positioning ring and the wall surface of the first installation groove are both provided with the positioning holes, and a positioning pin for limiting the rotation of the positioning ring relative to the first installation groove is inserted into the positioning hole.

[0017] As a preferred solution, a convex column is provided on the end of the moving iron core away from the fixed iron core, and correspondingly, a concave position matching the convex column is provided on the 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 glue.

[0018] As a preferred solution, the sealing assembly includes an O-ring and a sealing ring, the sealing ring has a through hole, and the sealing ring is respectively provided with a first annular extension and a second annular extension 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 to a section of the three-section stepped groove away from the positioning ring, the sealing ring and the first annular extension fix the O-ring to the middle section of the three-section stepped groove, and the plunger rod fixes the second annular extension to the first through hole.

[0019] As a preferred embodiment, a valve body mounting portion is extended from the side of the pump body, a three-way valve is provided on the valve body mounting portion, the quantitative channel includes a transverse section and a first vertical section and a second vertical section connected to the transverse section, the transverse section passes 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 provided at an 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 further 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 communicated with the main channel. The main channel is connected to the suction and discharge port, the second liquid inlet channel is connected to the first liquid inlet channel, and the second liquid outlet channel is connected to 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 provided 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 provided in the annular placement groove. The setting of the annular placement groove can avoid excessive reduction in 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 when the metering pump 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 as to separate the position of the elastic member from between the fixed iron core and the moving iron core, avoid further reduction in the area of ​​the magnetic flux, and ensure that the magnetic force between the fixed iron core and the moving iron core meets the overall normal operation. The structural design is ingenious, and 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 with reference to 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 point A in the middle;

[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 slot

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

[0034] 1031, horizontal 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 trough 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. Boss

[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. Accommodation groove

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

[0051] 42. Buffer insulation ring

[0052] 421, second mounting 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 723, second annular extension

[0061] 81. Positioning hole 82. Positioning pin

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

[0063] 85. Avoidance 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 limiting 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 mounting groove 101 and a suction and discharge port 102. The pump body 10 is provided with a quantitative channel 103 connected to the suction and discharge port 102. The end of the quantitative channel 103 away from the suction and discharge port 102 is connected to the first mounting groove 101 through a plunger movable groove 104. The pump body 10 is also provided with a first liquid inlet channel 105 and a first liquid outlet channel 106.

[0067] See 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, and 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. 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 sealing the end of the transverse section 1031. The suction and discharge port 102 is provided at an 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 provided on both sides of the first vertical section 1032, and the plunger movable groove 104 is provided at an 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 that 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 between suction and discharge to achieve quantitative metering.

[0069] The plunger assembly 40 includes a positioning ring 41, a buffer insulation ring 42, and a plunger rod 43. The positioning ring 41 is arranged in the first mounting groove 101. The positioning ring 41 is provided with a receiving groove 411 and a first through hole 412 for the plunger rod 43 to pass through, which is connected to the receiving groove 411. The buffer insulation ring 42 is arranged in the receiving groove 411. The buffer insulation ring 42 can be made of rubber. The end of the buffer insulation ring 42 away from the moving iron core 31 is provided with a second mounting groove 421. The plunger rod 43 is arranged in the second mounting groove 421. The plunger rod 43 can be a ceramic plunger rod 43. The end of the plunger rod 43 away from the buffer insulation ring 42 passes through the first through hole 412 and extends into the plunger movable groove 104. A sealing assembly 70 is provided 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 mounting 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 provided 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 thereby drive the plunger rod 43 to move in the plunger movable groove 104. The elastic member 33 can be a spring.

[0071] See Figure 3 As shown, specifically, the electromagnetic control device 30 further includes a pressure plate 34, a skeleton 35, a coil 36, and an iron shell 37. The pressure plate 34 is fixed to 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 to the pressure 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. The end of the fixed iron core 32 away from the movable 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, thereby adjusting 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. An annular protrusion 342 is 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. Correspondingly, the positioning ring 41 is recessed with an annular groove 413 that matches the annular protrusion 342, and the annular protrusion is clamped in the annular groove 413.

[0074] An abutting portion 427 is provided 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 abutting portion 427 and the pressure plate 34 respectively.

[0075] See 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. 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. 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. The first rotation limiting surface 83 and the second rotation limiting surface 84 can limit the rotation of the buffer heat-insulating ring 42 relative to the accommodating groove 411. The wall surface of the accommodating groove 411 is provided with avoidance grooves 85 on both sides of the second rotation limiting surface 84 for preventing interference between the first rotation limiting surface 83 and the second rotation limiting surface 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 reducing 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 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 accordingly, 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 accordingly, 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 end of the moving iron core 31 away from the fixed iron core 31 by structural glue. 2; an annular groove 431 is provided on the outer periphery of the plunger rod 43, and a plug hole 424 and a first glue injection hole 425 are provided on the outer periphery of the buffer heat-insulating ring 42, which are connected to the second mounting groove 421 and corresponding to the annular groove 431. The outer periphery of the buffer heat-insulating ring 42 is also provided with a second glue injection hole 426 corresponding to the bottom of the plunger rod 43, and a pin is passed through the plug hole 424, and the pin is clamped in the annular groove 431 to complete the positioning of the plunger rod 43 in the second mounting groove 421. Structural glue is filled through the first glue injection hole 425 and the second glue injection hole 426 to complete the fixation of the plunger rod 43 in the second mounting groove 421.

[0078] See 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. 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-section stepped groove 107. The positioning ring 41 and the plunger rod 43 together fix the sealing ring 72 to a section of the three-section 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-section 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-section stepped groove 107. 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 an opening smaller at the top and larger at the bottom. The first annular extension portion 722 is arranged with an opening larger at the top and smaller 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. The magnetic field passes through the iron shell 37, the fixed iron core 32, and the movable iron core 31 in sequence to form a magnetic circuit. Finally, an electromagnetic force is generated between the fixed iron core 32 and the movable iron core 31, which attracts the movable 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, completing the liquid aspiration operation in the quantitative channel 103.

[0082] After the liquid is sucked in, the coil 36 is powered off, and the movable iron core 31, the buffer heat-insulating ring 42 and the plunger rod 43 are separated from the fixed iron core 32 under the restoring force of the elastic member 33 and move upward 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 provided 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 provided in the annular placement groove. The setting of the annular placement groove can avoid excessive reduction in 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 when the metering pump 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 as to separate the position of the elastic member from between the fixed iron core and the moving iron core, avoid further reduction in the area of ​​the magnetic flux, and ensure that the magnetic force between the fixed iron core and the moving iron core meets the overall normal operation. The structural design is ingenious, and 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 merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor 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 mounting groove and a quantitative passage, wherein the first mounting groove and the quantitative passage are connected via a plunger movable groove; The plunger assembly includes a positioning ring, a buffer heat-insulating ring, and a plunger rod, the positioning ring is arranged in the first mounting groove, the outer periphery of the positioning ring and the wall surface of the first mounting groove are provided with positioning holes, a positioning pin for limiting the rotation of the positioning ring relative to the first mounting groove is inserted in the positioning hole, the positioning ring is provided with a receiving groove and a first through hole for the plunger rod to pass through the receiving groove, the buffer heat-insulating ring is arranged in the receiving groove, the end of the buffer heat-insulating ring close to the plunger movable groove is provided with a second mounting groove, the plunger rod is arranged in the second mounting groove, the end of the plunger rod close to the plunger movable groove passes through the first through hole and extends into the plunger movable groove, and a sealing assembly is provided between the outer periphery of the plunger rod and the plunger movable groove; An electromagnetic control device, wherein the electromagnetic control device fixes the positioning ring in the 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 the 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 arranged on the outer periphery of the buffer heat insulation ring, the 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 The buffer heat-insulating ring moves toward the plunger movable groove and thus drives the plunger rod to move in the plunger movable groove. The outer periphery of the buffer heat-insulating ring close to the plunger movable groove is provided with an abutting portion, and the two ends of the elastic member abut against the abutting portion and the electromagnetic control device respectively. The outer periphery of the abutting portion is provided with two adjacent or oppositely arranged first rotation limiting surfaces. Correspondingly, the wall surface of the accommodating groove is provided with two second rotation limiting surfaces corresponding to the first rotation limiting surfaces. The wall surface of the accommodating groove is provided with avoidance grooves on both sides of the second rotation limiting surface to prevent interference between the first rotation limiting surface and the second rotation limiting surface.

2. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: 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.

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. 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.

5. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: The end of the moving iron core away from the fixed iron core is provided with a convex column, and correspondingly, the end of the buffer heat insulation ring close to the moving iron core is provided with a recessed position matching the convex column, and the recessed 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 glue.

6. A 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. The sealing ring is respectively provided with a first annular extension and a second annular extension at both ends of the through hole. 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 to a section of the three-section stepped groove away from the positioning ring. The sealing ring and the first annular extension fix the O-ring to the middle section of the three-section stepped groove. The plunger rod fixes the second annular extension to the first through hole.

7. A silent electromagnetic plunger metering pump according to claim 1, characterized in that: A valve body mounting portion extends from the side of the pump body, a three-way valve is provided on the valve body mounting portion, the quantitative channel includes a transverse section and a first vertical section and a second vertical section connected to the transverse section, the transverse section passes 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 provided at an 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 further 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 communicated with the main channel. The main channel is connected to the suction and discharge port, the second liquid inlet channel is connected to the first liquid inlet channel, and the second liquid outlet channel is connected to the first liquid outlet channel.

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