CN114877103B

CN114877103B - High-voltage electric proportional valve

Info

Publication number: CN114877103B
Application number: CN202210798735.8A
Authority: CN
Inventors: 章苗英; 汪达军; 周鲁逵; 竺军; 曹建波
Original assignee: Xingyu Electron Ningbo Co ltd
Current assignee: Xingyu Electron Ningbo Co ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-10-21
Anticipated expiration: 2042-07-08
Also published as: CN114877103A

Abstract

The invention discloses a high-voltage electric proportional valve which comprises a main valve body, a first proportional solenoid valve and a second proportional solenoid valve, wherein the main valve body is provided with a first valve seat and a second valve seat; the second proportional electromagnetic valve comprises a static iron core and a movable iron core, the static iron core comprises a solid part and a sleeve part which are separated through a magnetism isolating ring, the end face, opposite to the solid part, of the movable iron core comprises a circular ring face located in the center of the end face, a circular table face is spliced along the outer edge of the circular ring face, the distance between points on the circular table face and the end face of the solid part is gradually increased from the center to the edge, an included angle of 45-90 degrees is formed between a bus and the central axis on the circular table face, a magnetism isolating gasket is arranged on the outer side of the end face, opposite to the solid part, of the movable iron core, the magnetism isolating gasket comprises a first magnetism isolating part and a second magnetism isolating part, the first magnetism isolating part is attached to the circular ring face, the second magnetism isolating part is attached to the circular table face, and the first magnetism isolating part and the second magnetism isolating part are flat cushions which are uniform in thickness. The invention can always ensure good linearity and high stability of output of the output end in the long-time use process.

Description

High-voltage electric proportional valve

Technical Field

The invention relates to the technical field of proportional solenoid valves, in particular to a high-voltage electric proportional valve.

Background

The high-voltage electric proportional valve is applied to a pneumatic control occasion with higher input and output pressure, the requirements on the linearity and the stability of an output end are extremely high, in order to keep the linearity and the stability of the output end, a high-stability high-voltage electric proportional valve is disclosed in patent publication No. CN 113803480A, the electric proportional valve comprises a main valve body and two proportional solenoid valves, the output ends of the two proportional solenoid valves are arranged in the main valve body, the two output ends of the two proportional solenoid valves are matched with the inner wall of the main valve body to form a closed cavity, an external air source enters the closed cavity through the input end and the output end of one of the proportional solenoid valves in sequence, and is discharged from the closed cavity through the output end and the input end of the other proportional solenoid valve in sequence, the closed cavity is used as a transfer station on a flow path of the high-pressure air source, and can play a role in stabilizing pressure, and finally the proportional solenoid valve which plays a role in air outlet valve has better linearity and higher stability in proportional control output.

In addition to the pressure stabilizing effect of the closed cavity, the other factor of the patent which can show better linearity and stability is that the proportional solenoid valve which plays the role of an air outlet valve in the two proportional solenoid valves is also specially designed, specifically, a magnetic isolating wear-resistant pad which is fixed on the inner wall of a static iron core is arranged between a radial direction and the static iron core of a movable iron core of the proportional solenoid valve, the magnetic isolating wear-resistant pad is not uniform in thickness, and the thickness of one section of the top of the movable iron core is gradually changed from thick to thin, so that the mutual influence between the upper section and the lower section of the static iron core is better cut off, and the magnetic isolating effect of the movable iron core is optimal.

Through further research, factors influencing the linearity and stability of the high-voltage electric proportional valve are not only that the static iron cores of the upper section and the lower section of the proportional solenoid valve cannot achieve magnetic isolation in an ideal state, but also that the air tightness of the proportional solenoid valve is a big influence factor, and taking the proportional solenoid valve which plays a role of an air outlet valve in the patent publication No. CN 113803480A as an example, because the movement of a piston rod cannot ensure complete sealing, in an actual use working condition, a high-pressure air source of a sealed cavity can flow to the position of a movable iron core finally along a gap between the piston rod and a piston sleeve and a gap between a movable ejector rod and the static iron core, and the linearity of the proportional solenoid valve is influenced. In actual working condition, the motion cavity that moves the iron core place is not evenly filled with to the leakage of air supply, move and have an upstream end face on the iron core, this end face receives the impact of air supply gas leakage at first, the instantaneous atmospheric pressure that the upstream end face received will be higher than another face, leak gas afterwards and slowly make the whole atmospheric pressure in the motion cavity that moves the iron core place balanced through the clearance between moving iron core and the quiet iron core, this process needs certain time, the longer the time, the linearity that the proportion solenoid valve shows will be worse, like the proportion solenoid valve in patent publication No. CN 113803480A, this process can be hindered especially to its form of installing additional that separates magnetism wear pad.

In addition, after the high-stability high-voltage electric proportional valve disclosed in patent publication No. CN 113803480A is put into practical use, the gap between the outer wall of the movable iron core and the inner wall of the static iron core is small, the space for installing the magnetism isolating and wear-resisting pad is already very small, and the magnetism isolating and wear-resisting pad is made into a non-equal wall thickness form, so as to avoid frequent friction between the movable iron core and the magnetism isolating and wear-resisting pad, which makes the requirement on the linearity of the reciprocating motion of the movable iron core extremely high, and requires high processing and assembling precision.

Disclosure of Invention

The invention aims to provide a high-voltage electric proportional valve. The invention can always ensure good linearity and high stability of output of the output end in the long-time use process.

The technical scheme of the invention is as follows: a high-voltage electric proportional valve comprises a main valve body, a first proportional solenoid valve and a second proportional solenoid valve, wherein a closed cavity is arranged in the main valve body, and the first proportional solenoid valve and the second proportional solenoid valve are communicated with the closed cavity and are respectively used for air inlet and air outlet; the second proportional electromagnetic valve comprises a static iron core and a movable iron core, the static iron core comprises a solid part and a sleeve part which are separated by a magnetism isolating ring, the movable iron core is arranged in the sleeve part, a movable ejector rod penetrates through the solid part, one end of the movable ejector rod is connected with the movable iron core, the other end of the movable ejector rod is connected with a piston rod, a piston sleeve is arranged on the outer side of the piston rod, the opening and closing of the second proportional electromagnetic valve are controlled through the matching of the piston rod and the piston sleeve, the end face, opposite to the solid part, of the movable iron core comprises a circular ring face located in the center of the end face, a circular table face is spliced along the outer edge of the circular ring face, the distance between the center and the edge on the circular table face and the end face of the solid part is gradually increased, an included angle of 45-90 degrees is formed between a bus and a central axis on the circular table face, and the outer side, opposite to the solid part, of the movable iron core, and a magnetism isolating gasket is arranged on the end face of the movable iron core.

Compared with the prior art, the invention has the beneficial effects that: firstly, the invention designs the shape of the end face (namely the incident end face) opposite to the solid part on the movable iron core, and improves the end face from the conventional plane into a structure of splicing a circular ring face and a circular table face, and the circular table face inclines towards the direction of gas flow, so that intuitively, the area of the incident end face is increased, the air leakage impact can be more uniformly and quickly dispersed, and the design of the shape of the incident end face is directed against the design of the conventional sleeve type movable iron core and static iron core matching structure, the space between the movable iron core and the solid part is increased, when the air leakage enters the cavity of the movable iron core, the larger space between the movable iron core and the static iron core is beneficial to buffering the instantaneous pressure of the air leakage flow on the incident end face of the movable iron core, so that the pressure difference between the incident end face and the other face in the moving direction of the movable iron core is not too large, and the linearity and the stability of the output of the invention are beneficial to be improved; in addition, the magnetic-isolating wear-resistant pad is not arranged between the outer wall of the movable iron core and the inner wall of the sleeve part, so that although a certain magnetic-isolating performance is sacrificed, the cavity where the movable iron core is located can be filled with air leakage at the highest speed, namely, the two ends of the movable iron core can reach pressure balance at the highest speed, and the influence of the air leakage on the movable iron core is reduced to the minimum.

In the aforementioned high-voltage electric proportional valve, the magnetic isolation gasket includes a first magnetic isolation portion attached to the circular ring surface, and a second magnetic isolation portion attached to the circular table surface, the first magnetic isolation portion and the second magnetic isolation portion are both flat pads with uniform thickness, and the arrangement of the magnetic isolation gasket does not change the overall shape of the upstream end face of the movable iron core.

Because the magnetic-isolating wear-resistant pad is not arranged between the outer wall of the movable iron core and the inner wall of the sleeve part, in order to improve the magnetic-isolating effect between the solid part and the sleeve part of the static iron core, the magnetic-isolating pad matched with the incident flow end face is designed on the basis of the shape of the incident flow end face opposite to the solid part on the movable iron core, and comprises a first magnetic-isolating part and a second magnetic-isolating part, wherein the first magnetic-isolating part plays a magnetic-isolating role and also can be used as a buffer between the movable iron core and the static iron core, and the second magnetic-isolating part plays a magnetic-isolating role and also can play a flow-guiding role, so that air leakage can be uniformly and quickly dispersed.

In the aforementioned high-voltage electric proportional valve, the thickness of the first magnetism isolating part is greater than the thickness of the second magnetism isolating part.

In the aforementioned high-voltage electric proportional valve, the thickness of the first magnetism isolating part is 3 times of the thickness of the second magnetism isolating part, which helps the invention to achieve the best linearity and stability.

In the aforementioned high-voltage electric proportional valve, the included angle of 70 ° between the generatrix and the central axis on the circular table surface is helpful for the present invention to achieve the best linearity and stability.

In the high-voltage electric proportional valve, when the movable iron core moves axially along the sleeve part, the projection of the second magnetism isolating part in the radial direction of the movable iron core always falls in the range covered by the axial length of the magnetism isolating ring, the magnetism isolating ring is matched with the magnetism isolating gasket, a complete magnetism isolating barrier is formed between the solid part and the sleeve part in the radial direction, and along with the axial movement of the movable iron core, the magnetism isolating barrier exists all the time, the influence of the sleeve part of the static iron core on the movement of the movable iron core during power-on can be reduced to the maximum extent, the linear correlation degree between the power-on current and the output air pressure in the control process is improved, and the air outlet control proportion is more linear and stable.

In addition, because the magnetism isolating gasket is arranged on the upstream end face of the movable iron core and moves together with the movable iron core, compared with the method of arranging the magnetism isolating wear-resistant pad between the outer wall of the movable iron core and the inner wall of the sleeve part, the magnetism isolating gasket is not easy to wear, can always keep higher magnetism isolating performance, and can always ensure good linearity and high stability of output air pressure of the output end in the long-time use process.

In the high-voltage electric proportional valve, the solid part is provided with the middle cavity at one end close to the piston rod, and when the high-pressure gas source leaks along the gap between the piston rod and the piston sleeve and the gap between the movable ejector rod and the solid part of the static iron core, the middle cavity can be used as a first barrier for stabilizing the pressure during gas leakage, so that the impact force of the gas on the upstream end face of the movable iron core is buffered.

In the high-voltage electric proportional valve, a bearing chamber is arranged at one end of the solid part close to the movable iron core, a self-lubricating bearing is connected to a position, corresponding to the bearing chamber, on the outer side of the movable ejector rod, and the bearing chamber not only can provide space for the movement of the self-lubricating bearing, but also can be used as a second barrier for stabilizing pressure during gas leakage, so that the impact force of gas on the upstream end face of the movable iron core is buffered.

In the high-voltage electric proportional valve, the end of the sleeve portion is connected with the sealing plug, the movable iron core is connected with the sealing plug through the tension spring, and when the second proportional solenoid valve is not powered on, the action of the tension spring is helpful for keeping the sealing performance of the second proportional solenoid valve.

In the high-voltage electric proportional valve, the first proportional solenoid valve and the second proportional solenoid valve have the same structure and are symmetrically arranged at two ends of the main valve body.

Among the aforesaid high-voltage electric proportional valve, the output setting of second proportional solenoid valve is in the lateral wall of piston bush, the input setting of second proportional solenoid valve is in the piston bush tip, the tip of piston rod is equipped with seal assembly, is connected with the pressure spring between piston rod and the piston bush, and when second proportional solenoid valve outage, seal assembly plugged up the input of second proportional solenoid valve under the pressure spring effect, helps keeping the leakproofness of second proportional solenoid valve.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at M;

FIG. 3 is a schematic structural view of a second proportional solenoid valve in embodiment 1;

FIG. 4 is a schematic structural view of a second proportional solenoid valve in embodiment 2;

FIG. 5 is a schematic structural view of a second proportional solenoid valve in embodiment 3;

FIG. 6 is a schematic structural view of a second proportional solenoid valve in embodiment 4;

FIG. 7 is a schematic structural view of a second proportional solenoid valve in embodiment 5;

FIG. 8 is a schematic structural view of a second proportional solenoid valve in embodiment 6;

FIG. 9 is a graph showing the relationship between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in example 1;

FIG. 10 is a graph showing the relationship between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in example 2;

FIG. 11 is a graph showing the relationship between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in example 3;

FIG. 12 is a graph showing the relationship between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in example 4;

FIG. 13 is a graph showing the relationship between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in example 5;

fig. 14 is a data relationship diagram between the energization current and the output flow rate of the second proportional solenoid valve obtained by the test in embodiment 6.

Reference numerals are as follows: 1-a main valve body, 2-a first proportional solenoid valve, 3-a second proportional solenoid valve, 31-a static iron core, 32-a movable iron core, 33-a magnetic isolation ring, 34-a movable ejector rod, 35-a piston rod, 36-a piston sleeve, 37-a magnetic isolation gasket, 38-a bearing chamber, 39-a middle cavity, 40-a closed end plug, 41-a tension spring, 42-a sealing component, 43-a pressure spring, 101-a closed cavity, 311-a solid part, 312-a sleeve part, 321-a circular ring surface, 322-a circular table surface, 371-a first magnetic isolation part and 372-a second magnetic isolation part.

Detailed Description

The invention is further described with reference to the following figures and examples, which are not to be construed as limiting the invention.

Example 1: a high-voltage electric proportional valve is structurally shown in figure 1 and comprises a main valve body 1, a first proportional solenoid valve 2 and a second proportional solenoid valve 3, wherein the first proportional solenoid valve 2 and the second proportional solenoid valve 3 are identical in structure and symmetrically arranged at two ends of the main valve body 1, a closed cavity 101 is arranged in the main valve body 1, and the first proportional solenoid valve 2 and the second proportional solenoid valve 3 are communicated with the closed cavity 101 and are respectively used for air inlet and air outlet; the outer side wall of the main valve body 1 is provided with an air inlet communicated with the input end of the first proportional solenoid valve 2 and an air outlet communicated with the output end of the second proportional solenoid valve 3; the second proportional solenoid valve 3 comprises a static iron core 31 and a movable iron core 32, the static iron core 31 comprises a solid part 311 and a sleeve part 312, the solid part 311 and the sleeve part 312 are separated by a magnetism isolating ring 33, the end part of the sleeve part 312 is connected with a closed plug 40, the movable iron core 32 is arranged in the sleeve part 312, the movable iron core 32 is connected with the closed plug 40 through a tension spring 41, a movable ejector rod 34 axially penetrates through the solid part 311 along the static iron core 31, one end of the movable ejector rod 34 is connected with the movable iron core 32, the other end of the movable ejector rod is connected with a piston rod 35, a piston sleeve 36 fixedly connected with the inner wall of the main valve body 1 is arranged on the outer side of the piston rod 35, the output end of the second proportional solenoid valve 3 is arranged on the side wall of the piston sleeve 36, the input end of the second proportional solenoid valve 3 is arranged on the end of the piston sleeve 36, and a sealing assembly 42 for sealing the input end of the second proportional solenoid valve 3 is arranged on the end of the piston rod 35.

In the description of the embodiment, the input end and the output end of the first proportional solenoid valve 2 and the second proportional solenoid valve 3 are relative, and the invention adopts unconventional usage for the proportional solenoid valves, so that although the structures of the first proportional solenoid valve 2 and the second proportional solenoid valve 3 are the same, the input end of the second proportional solenoid valve 3 corresponds to the output end of the first proportional solenoid valve 2 for air intake, and the output end of the second proportional solenoid valve 3 corresponds to the input end of the first proportional solenoid valve 2 for air outtake.

The above structure can refer to a high-stability high-voltage electric proportional valve disclosed in patent publication No. CN 113803480A, and the working principle of the present invention can also refer to this patent, which is not described herein again.

As shown in fig. 2, in this embodiment, the end surface of the movable iron core 32 opposite to the solid portion 311 includes a circular ring surface 321 located at the center of the end surface, a circular table surface 322 is spliced along the outer edge of the circular ring surface 321, the distance between the point on the circular table surface 322 and the end surface of the solid portion 311 increases gradually from the center to the edge, and a magnetic isolation gasket 37 is disposed on the outer side of the end surface of the movable iron core 32 opposite to the solid portion 311.

Preferably, the magnetic isolation pad 37 is located outside the circular ring surface 321.

Preferably, a bearing chamber 38 is provided at one end of the solid portion 311 close to the movable iron core 32, and a self-lubricating bearing is connected to a portion of the movable plunger 34 corresponding to the bearing chamber 38.

Preferably, the solid portion 311 is provided with an intermediate chamber 39 at an end thereof adjacent the piston rod 35.

Preferably, the generatrix of the circular table top 322 is at an angle of 45 ° to the central axis, see fig. 3, with angle a =90 ° in fig. 3.

In order to verify the performance change of the whole high-voltage electric proportional valve after the structure improvement of the second proportional solenoid valve 3 according to the present invention, the high-voltage electric proportional valve is tested through embodiments 2 to 6, in all embodiments, the air pressure in the stable closed cavity 101 is 1bar, and the flow rate change value of the compressed gas, that is, the flow rate change at the output end of the second proportional solenoid valve 3 is tested by gradually increasing the current value of the second proportional solenoid valve 3.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Example 2: in this embodiment, no magnetic isolation spacer 37 is used, and the end surface of the movable iron core 32 opposite to the solid portion 311 is only a circular ring surface 321, and the circular table surface 322 is not spliced, as shown in fig. 4, the angle B =90 ° in fig. 4 is referred to, and the remaining conditions are the same as those in embodiment 1.

Example 3: in this embodiment, the end surface of the movable iron core 32 opposite to the solid portion 311 is only a circular ring 321, and the circular table top 322 is not spliced, referring to fig. 5, an angle C =90 ° in fig. 5, and the rest conditions are the same as those in embodiment 1, that is, a magnetic isolation gasket 37 located outside the circular ring 321 is added on the basis of embodiment 2.

Example 4: in this embodiment, an included angle of 60 ° is formed between the generatrix and the central axis on the circular table top 322, which can be referred to as fig. 6, and the angle D =120 ° in fig. 6, and the rest conditions are the same as those in embodiment 1.

Example 5: in this embodiment, an included angle of 70 ° is formed between the generatrix and the central axis on the circular table top 322, which can be referred to fig. 7, and the angle E =140 ° in fig. 7, and the other conditions are the same as those in embodiment 1.

Example 6: the present embodiment is similar to embodiment 5 except for the magnetic isolation pad 37, except that the magnetic isolation pad 37 of the present embodiment includes a first magnetic isolation portion 371 attached to the circular ring 321, and a second magnetic isolation portion 372 attached to the circular table top 322, and both the first magnetic isolation portion 371 and the second magnetic isolation portion 372 are flat pads with uniform thickness.

Preferably, the thickness of the first magnetic shielding portion 371 is greater than that of the second magnetic shielding portion 372, specifically: the thickness of the first magnetic shield 371 is 3 times the thickness of the second magnetic shield 372.

Preferably, when the plunger 32 moves axially along the sleeve portion 312, the projection of the second magnetism isolating portion 372 in the radial direction thereof always falls within the range covered by the axial length of the magnetism isolating ring 33.

The specific structure can refer to fig. 8, and the angle F =140 ° in fig. 8.

The test results were as follows:

example 1 (data plot for test results see fig. 9):

serial number	Current (mA)	Flow (SLPM)
			1	600	Is not opened
2	620	Is not opened
			3	640	Is not opened
4	660	Is not opened
			5	680	3
6	700	8
			7	720	12
8	740	24
			9	760	35
10	780	58
			11	800	75
12	820	89
			13	840	98
14	860	112
			15	880	124
16	900	134
			17	920	167
18	940	179
			19	960	191
20	980	195

Example 2 (data plot for test results see fig. 10):

serial number	Current (mA)	Flow (SLPM)
			1	600	Is not opened
2	620	Is not opened
			3	640	Is not opened
4	660	Is not opened
			5	680	Is not opened
6	700	Is not opened
			7	720	8
8	740	78
			9	760	95
10	780	95
			11	800	95
12	820	120
			13	840	120
14	860	120
			15	880	175
16	900	195
			17	920	195
18	940	195
			19	960	195
20	980	195

Example 3 (data relationship of test results see fig. 11):

serial number	Current (mA)	Flow (SLPM)
			1	600	Is not opened
2	620	Is not opened
			3	640	Is not opened
4	660	Is not opened
			5	680	Is not opened
6	700	Is not opened
			7	720	8
8	740	35
			9	760	74
10	780	98
			11	800	117
12	820	123
			13	840	135
14	860	146
			15	880	153
16	900	167
			17	920	181
18	940	192
			19	960	195
20	980	195

Example 4 (data plot of test results see fig. 12):

serial number	Current (mA)	Flow (SLPM)
			1	600	Is not opened
2	620	Is not opened
			3	640	3
4	660	8
			5	680	16
6	700	34
			7	720	54
8	740	74
			9	760	92
10	780	109
			11	800	113
12	820	128
			13	840	134
14	860	138
			15	880	150
16	900	164
			17	920	176
18	940	186
			19	960	193
20	980	195

Example 5 (data plot for test results see fig. 13):

serial number	Current (mA)	Flow (SLPM)
			1	600	2.50
2	620	2.46
			3	640	2.42
4	660	2.39
			5	680	2.35
6	700	2.30
			7	720	2.21
8	740	2.14
			9	760	2.07
10	780	2.01
			11	800	1.92
12	820	1.82
			13	840	1.74
14	860	1.61
			15	880	1.48
16	900	1.36
			17	920	1.23
18	940	1.12
			19	960	0.94
20	980	0.80

Example 6 (data plot of test results see fig. 14):

serial number	Current (mA)	Flow (SLPM)
			1	600	4
2	620	6
			3	640	13
4	660	25
			5	680	36
6	700	52
			7	720	65
8	740	76
			9	760	82
10	780	98
			11	800	107
12	820	115
			13	840	126
14	860	135
			15	880	147
16	900	159
			17	920	164
18	940	179
			19	960	182
20	980	189
			21	1000	192
22	1020	195

Examples 1-6 data plots of the test energization current versus output flow are shown in fig. 9-14, respectively, where data is recorded for each 20mA increase in energization current in examples 1-6.

If the test result in the embodiment 1 is taken as the minimum requirement for the qualified linearity of the high-voltage electric proportional valve, in the

embodiments

2 and 3, the current-facing end surface of the movable iron core 32 is not designed to be the structure formed by splicing the circular ring surface 321 and the circular table surface 322, so that the starting current of the second proportional solenoid valve 3 is increased, the flow proportional curve is narrow, the effect is completely unsatisfactory, and the proportional linearity is absent.

Although the linearity of the embodiment 1 is defined as qualified, it can be seen that when the input current reaches more than 660mA, the flow output end has feedback, which is better than the linearity of the

embodiments

2 and 3, but the influence of the embodiment 1 caused by not providing the magnetic isolation wear-resistant pad between the outer wall of the movable iron core 32 and the inner wall of the sleeve part 312 is still larger, even if the incident flow end surface of the movable iron core 32 is designed to be the structure of splicing the circular ring surface 321 and the circular table surface 322, the linearity is not better than the best embodiment in the high-stability high-voltage electric proportional valve of the patent publication No. CN 113803480A, because the magnetic isolation pad 37 is provided on the end surface of the movable iron core 32, the linearity performance of the embodiment 1 is verified to be inferior to that of providing the magnetic isolation wear-resistant pad between the outer wall of the movable iron core 32 and the inner wall of the sleeve part 312, but the linearity of the embodiment 1 is not further deteriorated with the increase of the service time, so that the embodiment 1 has certain practicability, and is suitable for the working condition of not high-voltage electric proportional valve control accuracy.

In embodiment 4, the starting current of the second proportional solenoid valve 3 is reduced relative to embodiment 1, the flow rate proportional curve is widened, and it is described that the structure forming the included angle of 60 ° between the generatrix and the central axis on the circular table top 322 is better than the structure forming the included angle of 45 °, but the linearity is still better than the best embodiment in the high-stability high-voltage electric proportional valve disclosed in patent publication No. CN 113803480A, and embodiment 4 has been verified to be inferior to the way of arranging the magnetic-isolating wear-resistant pad between the outer wall of the movable iron core 32 and the inner wall of the sleeve portion 312 because the magnetic-isolating gasket 37 is arranged on the end face of the movable iron core 32, but considering that the linearity of embodiment 4 is not further degraded with the increase of the service time, embodiment 4 has certain practicability, and is suitable for the working condition that the control precision of the high-voltage electric proportional valve is not high (but higher than embodiment 1).

In embodiment 5, the starting current of the second proportional solenoid valve 3 is reduced relative to embodiment 4, and the flow rate proportional curve is further widened, which indicates that the structure forming an included angle of 70 ° between the generatrix and the central axis on the circular table top 322 is better than the structure forming an included angle of 60 °, but the linearity thereof is still better than that of the best embodiment in the high-stability high-voltage electric proportional valve of patent publication No. CN 113803480A (but the linearity performance of embodiment 5 is already relatively close), and considering that the linearity of the high-stability high-voltage electric proportional valve of patent CN 113803480A decreases with the increase of the service time, the solution of embodiment 5 is actually higher than that of the high-stability high-voltage electric proportional valve of patent CN 113803480A in practicality, and embodiment 5 can be suitable for the working condition with higher control accuracy of the high-voltage electric proportional valve (but slightly lower than that of patent CN 113803480A).

The second proportional solenoid valve 3 in embodiment 6 has the minimum starting current in each embodiment, the widest flow rate proportional curve, and the best linearity, which means that the incident end face of the movable iron core 32 is designed into the circular ring face 321+ the circular table face 322, and the included angle of 70 ° is formed between the generatrix on the circular table face 322 and the central axis, and the linearity of the magnetic isolation gasket 37 formed by combining the first magnetic isolation part 371 and the second magnetic isolation part 372 is even better than that of the optimal embodiment in the high-stability high-voltage electric proportional valve in patent publication No. CN 113803480A, and the design combination of the incident end face of the movable iron core 32 and the structural design of the magnetic isolation gasket 37 in embodiment 6 compensates for the influence of no magnetic isolation wear-resistant pad between the outer wall of the movable iron core 32 and the inner wall of the sleeve part 312, and simultaneously, embodiment 6 also has the advantage that the linearity can be maintained stably and not be decreased all the time along with the increase of the use time, and is a better scheme than the optimal embodiment in the high-stability high-voltage electric proportional valve in patent publication No. CN 803480A 113high-voltage electric proportional valve, and is suitable for the working conditions with high-precision requirements.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned examples, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A high-voltage electric proportional valve comprises a main valve body (1), a first proportional solenoid valve (2) and a second proportional solenoid valve (3), wherein a closed cavity (101) is arranged in the main valve body (1), and the first proportional solenoid valve (2) and the second proportional solenoid valve (3) are communicated with the closed cavity (101) and are respectively used for air inlet and air outlet; second proportion solenoid valve (3) are including quiet iron core (31) and movable iron core (32), quiet iron core (31) are including through separating solid portion (311) and sleeve portion (312) that magnetic ring (33) is separated, movable iron core (32) set up in sleeve portion (312), it is equipped with movable ejector pin (34) to pass solid portion (311), movable ejector pin (34) one end is connected movable iron core (32), the other end is connected with piston rod (35), piston rod (35) outside is equipped with piston sleeve (36), the opening and close of cooperation control second proportion solenoid valve (3) through piston rod (35) and piston sleeve (36), its characterized in that:

the end face, opposite to the solid part (311), of the movable iron core (32) comprises a circular ring face (321) located in the center of the end face, a circular table face (322) is spliced along the outer edge of the circular ring face (321), the distance between a point on the circular table face (322) and the end face of the solid part (311) is gradually increased from the center to the edge, an included angle of 45-90 degrees is formed between a bus on the circular table face (322) and a central axis, and a magnetic isolation gasket (37) is arranged on the outer side of the end face, opposite to the solid part (311), of the movable iron core (32);

the magnetic isolation gasket (37) comprises a first magnetic isolation part (371) attached to the circular ring surface (321) and a second magnetic isolation part (372) attached to the circular table surface (322), and the first magnetic isolation part (371) and the second magnetic isolation part (372) are both flat pads with uniform thickness;

when the movable iron core (32) moves along the axial direction of the sleeve part (312), the projection of the second magnetism isolating part (372) in the radial direction of the second magnetism isolating part always falls within the range covered by the axial length of the magnetism isolating ring (33).

2. A high-voltage electrical proportioning valve according to claim 1 wherein: the thickness of the first magnetism isolating part (371) is larger than that of the second magnetism isolating part (372).

3. A high-voltage electrical proportioning valve according to claim 2 wherein: the thickness of the first magnetism isolating part (371) is 3 times of that of the second magnetism isolating part (372).

4. A high-voltage electrical proportioning valve according to claim 1 wherein: an included angle of 70 degrees is formed between a generatrix and a central axis on the circular table top (322).

5. A high voltage electrical proportional valve according to claim 1, 2, 3 or 4, wherein: one end of the solid part (311) close to the movable iron core (32) is provided with a bearing chamber (38), and the outer side of the movable ejector rod (34) corresponding to the bearing chamber (38) is connected with a self-lubricating bearing.

6. A high voltage electrical proportional valve according to claim 1, 2, 3 or 4, wherein: and one end of the solid part (311) close to the piston rod (35) is provided with a middle cavity (39).

7. A high-voltage electrical proportioning valve according to claim 1 wherein: the end part of the sleeve part (312) is connected with a closed choke plug (40), and the movable iron core (32) is connected with the closed choke plug (40) through a tension spring (41).

8. A high-voltage electrical proportioning valve according to claim 1 wherein: the output setting of second proportion solenoid valve (3) is in the lateral wall of piston bush (36), the input setting of second proportion solenoid valve (3) is in piston bush (36) tip, the tip of piston rod (35) is equipped with seal assembly (42), is connected with pressure spring (43) between piston rod (35) and piston bush (36), when second proportion solenoid valve (3) outage, seal assembly (42) plug up the input of second proportion solenoid valve (3) under pressure spring (43) effect.