CN115727140A

CN115727140A - Near-suction type electromagnetic valve

Info

Publication number: CN115727140A
Application number: CN202111021738.2A
Authority: CN
Inventors: 陈连珀
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-01
Filing date: 2021-09-01
Publication date: 2023-03-03

Abstract

The invention relates to a near-suction type electromagnetic valve for controlling the opening or closing of fluid, which comprises a fixed iron core, a main valve rod, a main valve plug and a micro spring, wherein the main valve plug is movably arranged on the main valve rod, the moving distance between the main valve rod and the fixed iron core is set as an initial idle stroke and a later near-suction type valve opening stroke, the main valve rod is provided with a top pull part, and the main valve plug is provided with a stopping part and a keeping distance. When the main valve rod moves in the initial idle stroke, the main valve plug is maintained in a closed state, and when the main valve rod moves to the near-suction valve opening stroke, the physical characteristic of larger magnetic attraction force is generated by the approach of the main valve rod and the fixed iron core, so that the top pulling part applies force to the stopping part to drive the main valve plug to deviate from the main valve port to remove static pressure, and then the main valve plug is jacked by the miniature spring to be far away from the main valve port to complement the moving distance of the initial idle stroke to open the valve.

Description

Near-suction type electromagnetic valve

Technical Field

The invention relates to a valve opening structure of an electromagnetic valve, which controls whether fluid flows or not by opening a valve plug through magnetic force generated after power supply. The valve is opened after the valve plug is pulled up by utilizing the physical characteristic of magnetic attraction enhancement in the near-suction valve opening stroke to remove static pressure, so that the aim of opening the valve plug with lower current power is fulfilled.

Background

The solenoid valve is usually used in a fluid delivery system for delivering gas or liquid, and controls whether fluid flows by opening a valve plug through magnetic force generated after power is supplied. The electromagnetic valve comprises a valve port for fluid to pass through, a valve plug which is constantly propped by a spring to positively close the valve port, a valve rod which can drive the valve plug to move, and a fixed iron core which can generate magnetic force when an electromagnetic coil group is electrified.

When the electromagnetic coil group is not electrified, the valve plug is maintained in a state of closing the valve port, and a fixed distance is reserved between the valve rod and the fixed iron core. When the electromagnetic coil group is electrified, the fixed iron core can generate magnetic force to adsorb the valve rod to move the fixed distance at one time, so that the valve rod is displaced to drive the valve plug to be reversely away from the opening valve port, and fluid can pass through the opening valve port. After the electromagnetic coil group is powered off, the magnetic force of the fixed iron core disappears, so that the valve rod and the valve plug are elastically propped by the spring to reset, and the valve plug closes the valve port again.

The above-mentioned structure is well established, but not perfect, and its reason is that the valve plug is when the closure state, and the fluid pressure that the valve plug upper reaches end bore can be greater than the low reaches end, when letting the valve plug open the valve, need overcome earlier and apply the hydrostatic pressure on the valve plug and the elasticity is held in the top of spring, just can open the valve port, and the aperture of valve port is big more moreover, and the area of valve plug is also big more, and the lifting surface area of the hydrostatic pressure that the valve plug receives is also big more, leads to solenoid group to need to consume more power and lets the valve plug open the valve.

Furthermore, the static pressure of the fluid is difficult to predict, and is often abnormally increased due to the instability of the temperature or pressure valve, in order to ensure that the valve plug can overcome the uncertain static pressure, the electromagnetic valve needs to be designed to use larger electric power to ensure that the valve can be opened really, and when the electromagnetic valve is opened, the distance between the fixed iron core and the valve rod is farthest, which is the weakest magnetic attraction of the electromagnetic valve, so the design of the electromagnetic valve for opening the valve can not be solved simply by considering the elastic force of the valve sealing spring alone.

In order to improve the problem of opening the solenoid valve, in the related art, CN109595346a is a small valve port communicating with the upstream and downstream of the main valve plug and a small valve plug capable of closing the small valve port, the aperture of the small valve port is smaller than that of the main valve port, so that the area of the small valve plug subjected to hydrostatic pressure is smaller than the area of the main valve plug subjected to pressure. When the electromagnetic valve is opened, the small valve plug can be driven to displace to open the small valve port with less power, so that a part of fuel gas firstly flows to the downstream to balance the pressure difference between the upstream and downstream of the main valve plug, and then the main valve plug is driven to open, the hydrostatic pressure borne by the main valve plug when the main valve plug is opened is reduced, and further the power when the main valve plug is driven to open by current is reduced.

Therefore, how to improve the problem of how to improve the prior art, the design of the present invention is to improve how to use the solenoid set to consume more power to make the fixed iron core generate larger magnetic attraction to overcome the hydrostatic pressure applied to the valve plug and the spring supporting elasticity, so that the solenoid valve can be opened with lower current power.

Disclosure of Invention

The invention aims to provide a valve opening structure of an electromagnetic valve, which aims to divide the moving stroke of a main valve rod into an initial idle stroke and a later-stage near-suction valve opening stroke, and utilizes the physical characteristic of magnetic attraction enhancement in the near-suction valve opening stroke to pull up a valve plug to release static pressure and then open the valve, so as to achieve the purpose of opening the valve plug with lower current power.

To achieve the above object, the present invention is a near-suction type solenoid valve, comprising a fixed iron core capable of generating magnetic force when a solenoid coil set is energized, a main valve stem capable of being attracted by magnetic force and moving toward the fixed iron core, a main valve plug movably disposed on the main valve stem and directly or indirectly abutted by a main spring to close a main valve port, and a micro spring disposed between the main valve stem and the main valve plug, wherein a pulling portion is disposed on a side of the main valve stem, and a stopping portion is disposed at a position opposite to the main valve plug; the method is characterized in that:

when the main valve plug closes the main valve opening, the moving distance between the main valve rod and the fixed iron core is set as an initial idle stroke and a near-suction valve opening stroke which is relatively close to the fixed iron core and has larger magnetic attraction, and a distance which is the same as the initial idle stroke is arranged between the top pull part of the main valve rod and the stopping part of the main valve plug;

when the electromagnetic coil is electrified and excited to enable the main valve rod to move towards the fixed iron core in an initial idle stroke with a relatively large distance, the main valve plug maintains a state of closing the main valve port, the top pulling part of the main valve rod synchronously moves towards the stopping part of the main valve plug, and the micro spring is synchronously compressed or stretched to accumulate a micro elastic opening force;

when the main valve rod moves to a near-suction valve-opening stroke relatively close to the fixed iron core, the top pulling part of the main valve rod abuts against the stopping part of the main valve plug, the top pulling part is driven to apply force to the stopping part through larger magnetic attraction between the fixed iron core and the main valve rod, the main valve plug is synchronously driven to deviate from the main valve opening, the upstream pressure and the downstream pressure of the main valve plug form a balanced state, and therefore the accumulated spring opening force is released through the micro spring to abut against the main valve plug to be far away from the main valve opening, and the moving distance of an initial idle stroke is complemented to open the valve.

By means of the structure, when the main valve rod moves in the initial idle stroke, the main valve plug can be maintained in a closed state, when the main valve rod moves to the near-suction valve opening stroke, the physical characteristic of larger magnetic attraction force is generated by the approach of the main valve rod and the fixed iron core, the top pulling part applies force to the stopping part to drive the main valve plug to deviate from the main valve port to remove static pressure, and then the micro spring is used for propping the main valve plug to be far away from the main valve port to open the valve, so that the purpose of opening the valve plug with lower current power is achieved.

Specific embodiments of the various elements are further described below:

when the valve is operated, the inner part of the main valve plug is hollow to form a moving space corresponding to the initial idle stroke, the bottom of the main valve rod is movably arranged in the moving space, so that when the main valve rod moves in the initial idle stroke, the bottom end of the main valve rod moves in the moving space, and the main valve plug maintains the state of closing the main valve port; and

the micro spring is arranged in the moving space and is propped against between the main valve plug and the main valve rod.

When the valve is operated, the inner part of the bottom of the main valve rod is hollow, so that a moving space corresponding to the initial idle stroke is formed; the top surface of the main valve plug is further provided with a connecting rod movably arranged in the moving space, so that when the main valve rod moves in an initial idle stroke, the main valve rod can move relative to the connecting rod and the main valve plug through the moving space, and the main valve plug is enabled to maintain the state of closing the main valve port; and

the micro spring is arranged in the moving space and is propped against between the connecting rod and the main valve rod.

When the main valve rod is operated, a main spring positioning frame for positioning a main spring is fixedly arranged on the periphery of the main valve rod, the bottom of the main spring positioning frame extends downwards to abut against the periphery of the side face of the main valve plug and can be driven by the main valve rod to move relative to the main valve plug, and the bottom end of the main spring positioning frame bends towards the side face of the main valve plug to form a hook shape so as to form the top pulling part; and

a convex ring is extended and projected from the periphery of the side surface of the main valve plug, and a stopping part is formed on one side of the convex ring relative to the hook-shaped top pulling part.

When the valve is operated, the center of the top surface of the main valve plug is concave downwards to form a moving space corresponding to the initial idle stroke, a limit ring is fixedly arranged above the moving space, and a stopping part is arranged on one side of the limit ring;

the bottom of the main valve rod is fixedly provided with a miniature spring positioning plate, and the edge of one side of the miniature spring positioning plate extends to form the top pulling part;

the bottom of the main valve rod and the miniature spring positioning plate can move in the moving space, so that the main valve plug maintains the state of closing the main valve port when the main valve rod moves in an initial idle stroke; and

the micro spring is arranged in the moving space and is abutted between the limit ring of the valve plug and the micro spring positioning plate of the main valve rod.

When the valve is operated, the inner part of the main valve plug is hollow to form a moving space corresponding to the initial idle stroke, and the inner part of the main valve plug protrudes towards the center of the moving space to form the stopping part;

the bottom of the main valve rod is fixedly provided with a miniature spring positioning plate, the edge of one side of the miniature spring positioning plate is provided with the top pull part, and the bottom of the main valve rod and the miniature spring positioning plate are movably arranged in the moving space, so that the main valve plug maintains the state of closing the main valve port when the main valve rod moves in an initial idle stroke; and

the micro spring is arranged in the moving space and is abutted against the position between the main valve plug and the micro spring positioning plate of the main valve rod.

When the valve is in use, a main spring positioning frame for positioning the main spring is fixedly arranged on the periphery of the main valve rod.

When the valve is operated, the inner part of the main valve plug is provided with an accommodating space, the bottom of the main valve rod is arranged at the downstream of the main valve plug after penetrating through the accommodating space, and an elastic airtight membrane surrounding the periphery of the main valve rod is arranged in the accommodating space in an extending way of the main valve plug, so that the airtight state can be maintained between the main valve plug and the main valve rod when the main valve rod moves in an initial idle stroke;

the micro spring is arranged at the downstream of the main valve plug and is propped between the main valve plug and the bottom of the main valve rod;

a main spring positioning frame for positioning a main spring is fixedly arranged on the periphery of the main valve rod relative to the upstream of the main valve plug, and the top pulling part is arranged on one side edge of the bottom of the main spring positioning frame; and

the top surface of the main valve plug is provided with a ring frame, and the edge of the ring frame corresponding to the top pulling part is provided with the stopping part.

When the valve is operated, a moving space is arranged in the main valve plug, the bottom of the main valve rod is arranged at the downstream of the main valve plug after penetrating through the moving space, and the main valve plug is provided with an elastic airtight membrane surrounding the periphery of the main valve rod in an extending way relative to the bottom of the moving space, so that the airtight state can be maintained between the main valve plug and the main valve rod when the main valve rod moves in an initial idle stroke;

a main spring positioning frame which can move in a moving space is fixedly arranged on the periphery of the main valve rod, the main spring positioning frame is used for positioning a main spring, and the top pull part is arranged on one side edge of the bottom of the main spring positioning frame; and

the inner part of the main valve plug protrudes towards the center of the moving space relative to the top pulling part to form the stopping part.

When the valve is operated, the top pulling part of the main valve rod is abutted against the stopping part of the main valve plug, and the main valve plug is pulled by the side edge to incline and deviate from the main valve opening to open the valve.

Compared with the prior art, the valve rod has the advantages that the moving stroke of the main valve rod is divided into the initial idle stroke and the later-stage near-suction valve opening stroke, the valve plug is pulled up by utilizing the physical characteristic of magnetic attraction enhancement in the near-suction valve opening stroke to release static pressure and then is opened, and the purpose of opening the valve plug with lower current power is achieved.

The following description will be made in conjunction with the drawings, exemplifying embodiments suitable for the present invention.

Drawings

Fig. 1 is a structural view of the first embodiment.

Fig. 2 is a schematic view of the first embodiment of the main valve stem as it moves in an initial lost motion.

FIG. 3 is a schematic illustration of the first embodiment of the near-suction valve-opening stroke bringing the main valve plug away from the main valve port.

FIG. 4 is a schematic illustration of the first embodiment with the main valve plug slightly unseated from the main valve port after the main valve plug is de-pressurized.

FIG. 5 is a schematic illustration of the first embodiment micro-spring holding the main valve plug away from the main valve port.

Fig. 6 is a structural view of the second embodiment.

FIG. 7 is a schematic view of the second embodiment of the main valve stem as it moves in an initial lost motion stroke.

FIG. 8 is a schematic illustration of the second embodiment's valve closing stroke bringing the main valve plug away from the main valve port.

FIG. 9 is a schematic illustration of the second embodiment micro-spring holding the main valve plug away from the main valve port.

Fig. 10 is a structural view of the third embodiment.

FIG. 11 is a schematic view of the third embodiment of the main valve stem as it moves in an initial lost motion stroke.

FIG. 12 is a third embodiment of a near-suction valve-opening stroke biasing a main valve plug away from a main valve port.

FIG. 13 is a schematic illustration of the third embodiment micro-spring holding the main valve plug away from the main valve port.

Fig. 14 is a structural view of the fourth embodiment.

FIG. 15 is a schematic view of the fourth embodiment of the main valve stem as it moves through an initial lost motion stroke.

FIG. 16 is a schematic illustration of the fourth embodiment's near-suction valve-opening stroke biasing the main valve plug away from the main valve port.

FIG. 17 is a schematic illustration of the micro-spring of the fourth embodiment urging the main valve plug away from the main valve port.

Fig. 18 is a structural view of the fifth embodiment.

FIG. 19 is a schematic illustration of the main valve stem of the fifth embodiment moving in an initial lost motion and the secondary valve plug remaining closed.

Fig. 20 is a schematic diagram of the fifth embodiment in which the near-suction valve-opening stroke causes the main valve plug to deviate from the main valve port and the sub valve plug to open.

FIG. 21 is a schematic illustration of the micro-spring of the fifth embodiment urging the main valve plug away from the main valve port.

Fig. 22 is a structural view of the sixth embodiment.

FIG. 23 is a schematic illustration of the main valve stem of the sixth embodiment moving in an initial lost motion and the secondary valve plug remaining closed.

Fig. 24 is a schematic diagram of the sixth embodiment in which the main valve plug is displaced from the main valve port and the sub valve plug is opened in the valve near-suction opening stroke.

FIG. 25 is a schematic illustration of the micro-spring of the sixth embodiment urging the main valve plug away from the main valve port.

Description of reference numerals: a1, initial idle stroke; a2, spacing; a3, moving space; a4 deforming; a5, sleeving a space; b1, a valve closing and opening stroke; 10 electromagnetic coil groups; 20 fixing the iron core; 30 a main valve stem; 31 a top pull part; 32 a main spring locating rack; 33 a miniature spring positioning plate; 34 a movable iron core; 35 a sliding chamber; 36 through holes; 37 holding the small iron core; 40 main springs; 50 main valve ports; 51 auxiliary valve port; 60 main valve plug; a 61 stopping part; 62 connecting rods; 63 a convex ring; 64 a stop collar; 65 elastic airtight membrane; 66 ring frames; 67 a rigid support; 70 micro-springs; 80 secondary valve stems; 81 sub-valve plugs.

Detailed Description

The invention relates to a near-suction type electromagnetic valve which can generate magnetic force to open a valve plug after power supply, so that whether fluid circulates or not is controlled.

As shown in fig. 1 to 25, the near-suction type solenoid valve includes a fixed core 20 capable of generating a magnetic force when a solenoid assembly 10 is energized, a main valve stem 30 capable of being attracted by the magnetic force and moving toward the fixed core 20, a main valve plug 60 movably disposed on the main valve stem 30 and directly or indirectly abutted by a main spring 40 to close a main valve port 50, and a micro-spring 70 disposed between the main valve stem 30 and the main valve plug 60.

When the main valve plug 60 is at the position to close the main valve port 50 (see fig. 1, 6, 10, 14, 18, and 22), the moving distance between the main valve stem 30 and the fixed core 20 is set to an initial idle stroke A1 and a near-suction valve-opening stroke B1, and the main valve stem 30 and the fixed core 20 are relatively distant from each other in the initial idle stroke A1 and relatively close to each other in the near-suction valve-opening stroke B1, so that the fixed core 20 has a physical characteristic of generating a large magnetic attraction force.

The main valve stem 30 has a top-pulling portion 31 on its side, a stop portion 61 is disposed at the opposite position of the main valve plug 60, and a distance A2 equal to the initial idle stroke A1 is formed between the top-pulling portion 31 and the stop portion 61.

Referring to fig. 2, 7, 11, 15, 19, 23, when the solenoid assembly 10 is energized to move the main valve stem 30 toward the fixed iron core 20 in the initial idle stroke A1, the main valve plug 60 maintains the state of closing the main valve port 50, so that the top-pulling portion 31 of the main valve stem 30 synchronously moves toward the stop portion 61 of the main valve plug 60 by the distance of the distance A2, and the micro-spring 70 is synchronously compressed or stretched to accumulate a micro-spring-open force.

When the main valve stem 30 moves to the close valve opening stroke B1 with respect to the fixed core 20, the top-pulling portion 31 of the main valve stem 30 abuts against the stopper portion 61 of the main valve plug 60, and referring to fig. 3, 8, 12, 16, 20, and 24, the top-pulling portion 31 is driven by a large magnetic attraction force between the fixed core 20 and the main valve stem 30 to apply a force to the stopper portion 61, the main valve plug 60 is synchronously biased away from the main valve port 50, the pressures upstream and downstream of the main valve plug 60 are balanced, the static pressure is released, and the accumulated biasing force of the micro spring 70 pushes the main valve plug 60 away from the main valve port 50 (refer to fig. 5, 9, 13, 17, 21, and 25) to compensate for the movement distance of the initial idle stroke A1, thereby opening the valve.

With the above-described configuration, the present invention movably arranges the main valve plug 60 on the main valve stem 30, and divides the moving stroke of the main valve stem 30 into the initial idle stroke A1 and the valve closing stroke B1, and when the main valve stem 30 moves in the initial idle stroke A1, the main valve plug 60 can be maintained in the state of closing the main valve port 50; when the main valve stem 30 moves to the valve closing stroke B1, the physical property of the main valve stem 30 and the fixed iron core 20 approaching to generate a large magnetic attraction force is used to make the top pulling portion 31 apply a force to the stopping portion 61 to pull the side of the main valve plug 60, so that the main valve plug 60 tilts away from the main valve port 50 to release the static pressure, and the micro spring 70 pushes the main valve plug 60 away from the main valve port 50 to open the valve, thereby achieving the purpose of opening the valve plug with low current power. The problem of among the prior art, let the solenoid group need consume more power and let fixed iron core produce great magnetic attraction and overcome the hydrostatic pressure of applying to the valve plug and the spring top holds elasticity is improved.

In the above structure, there are various embodiments between the main valve stem 30 and the main valve plug 60, and between the pull-up portion 31 and the stopper portion 61, and each embodiment will be described in detail in the following.

Referring to fig. 1 to 5, the main valve plug 60 is hollow to form a moving space A3 corresponding to the initial idle stroke A1, and the bottom of the main valve stem 30 is movably disposed in the moving space A3, referring to fig. 1 and 2, when the main valve stem 30 moves in the initial idle stroke A1, the bottom of the main valve stem 30 moves in the moving space A3 without driving the main valve plug 60, so that the main valve plug 60 maintains the state of closing the main valve port 50.

The micro spring 70 is disposed in the moving space A3 and abuts against the main valve plug 60 and the main valve stem 30, so that the bottom end of the main valve stem 30 is compressed synchronously and can accumulate the spring-open force when moving in the moving space A3.

Referring to fig. 6 to 9, the interior of the bottom of the main valve stem 30 is hollow to form a moving space A3 corresponding to the initial idle stroke A1; the top surface of the main valve plug 60 is further provided with a connecting rod 62, one end of the connecting rod 62 is movably arranged in the moving space A3, and the other end is embedded in the main valve plug 60 and has a clearance with the main valve plug 60.

Referring to fig. 6 and 7, when the main valve stem 30 moves at the initial idle stroke A1, the main valve stem 30 can move relative to the connecting rod 62 and the main valve plug 60 through the moving space A3 without driving the main valve plug 60, so that the main valve plug 60 maintains the state of closing the main valve port 50.

The micro spring 70 is disposed in the moving space A3 and abuts against the connecting rod 62 and the main valve stem 30, so that when the main valve stem 30 moves relative to the connecting rod 62, the micro spring 70 is compressed synchronously to accumulate the elastic force. When the main valve stem 30 moves in the valve closing stroke B1, the main valve plug 60 is displaced from the main valve port 50 with respect to the connecting rod 62 (see fig. 8) because there is a gap between the main valve plug 60 and the connecting rod 62, and when the pressures upstream and downstream of the main valve plug 60 are balanced and the static pressure is released, the micro spring 70 releases the accumulated biasing force to push the connecting rod 62, and the main valve plug 60 is moved away from the main valve port 50 to open the valve.

Furthermore, as shown in fig. 1 and fig. 6, a main spring positioning frame 32 is fixedly disposed on the periphery of the main valve stem 30, and the main spring positioning frame 32 is used for positioning the main spring 40 and pressing against the main valve plug 60, so that the main valve plug 60 is indirectly pressed by the main spring 40 to close the main valve port 50.

The bottom of the main spring positioning frame 32 extends downward to abut against the periphery of the side surface of the main valve plug 60, and the bottom end of the main spring positioning frame 32 bends toward the side surface of the main valve plug 60 to form a hook shape, so as to form the top pulling portion 31, a protruding ring 63 extends and protrudes from the periphery of the side surface of the main valve plug 60, and a stopping portion 61 is formed on one side of the protruding ring 63, which is opposite to the hook-shaped top pulling portion 31. Referring to fig. 2 and 7, the main spring positioning frame 32 can be driven by the main valve stem 30 to move relative to the main valve plug 60, so that the hook-shaped pulling portion 31 of the main spring positioning frame 32 moves to abut against the stop portion 61 of the main valve plug 60.

Referring to fig. 10 to 13, a moving space A3 corresponding to the initial idle stroke A1 is formed by the main valve plug 60 having a concave top surface, a limiting ring 64 is fixed above the moving space A3, and the stopping portion 61 is disposed on one side of the limiting ring 64.

The bottom of the main valve rod 30 is fixedly provided with a micro spring positioning plate 33, and one side edge of the micro spring positioning plate 33 extends to form the top pulling part 31.

Referring to fig. 10 and 11, the bottom of the main valve stem 30 and the micro-spring positioning plate 33 can move in the moving space A3, so that the main valve stem 30 does not move the main valve plug 60 during the initial idle stroke A1, and the main valve plug 60 maintains the state of closing the main valve port 50.

The micro spring 70 is disposed in the moving space A3 and abuts against the position between the retainer 64 of the main valve plug 60 and the micro spring positioning plate 33 of the main valve stem 30, so that when the bottom end of the main valve stem 30 and the micro spring positioning plate 33 move in the moving space A3, the micro spring 70 is compressed synchronously to accumulate the elastic force.

Referring to fig. 14 to 17, the main valve plug 60 is hollow to form a moving space A3 corresponding to the initial idle stroke A1, and the stopper 61 is formed by protruding the main valve plug 60 toward the center of the moving space A3.

The bottom of the main valve stem 30 is fixedly provided with a micro spring positioning plate 33, the edge of one side of the micro spring positioning plate 33 is provided with the top pulling part 31, the bottom of the main valve stem 30 and the micro spring positioning plate 33 are movably arranged in the moving space A3, so that when the main valve stem 30 moves in the initial idle stroke A1, as shown in fig. 15, the main valve plug 60 is not driven, and the main valve plug 60 maintains the state of closing the main valve port 50.

The micro spring 70 is disposed in the moving space A3 and abuts against the main valve plug 60 and the micro spring positioning plate 33 of the main valve stem 30, so that when the bottom end of the main valve stem 30 and the micro spring positioning plate 33 move in the moving space A3, the micro spring 70 is compressed synchronously and accumulates the spring force.

Furthermore, as shown in fig. 10 and fig. 14, a main spring positioning frame 32 for positioning the main spring 40 is fixed on the periphery of the main valve stem 30, and the main spring 40 elastically abuts against the main spring positioning frame 32, so as to push the main valve stem 30 to press against the main valve plug 60, so that the main valve plug 60 closes the main valve port 50.

In a fifth embodiment of the present invention, referring to fig. 18 to fig. 21, the main valve plug 60 has a receiving space inside, the bottom of the main valve stem 30 is located downstream of the main valve plug 60 after passing through the receiving space, and the main valve plug 60 is extended in the receiving space to form an elastic airtight membrane 65 around the outer periphery of the main valve stem 30, so that the main valve plug 60 and the main valve stem 30 can maintain an airtight state when the main valve stem 30 moves in the initial idle stroke A1.

In practice, the inner periphery of the elastic airtight diaphragm 65 can be fixed on the periphery of the main valve stem 30, so that when the main valve stem 30 moves in the initial idle stroke A1, the main valve stem 30 drives the elastic airtight diaphragm 65 to displace and deform A4, and does not drive the main valve plug 60, and in addition to effectively maintaining the airtight state between the two, the main valve plug 60 simultaneously maintains the state of closing the main valve port 50.

In this embodiment, the micro-spring 70 is disposed downstream of the main valve plug 60 and is supported between the main valve plug 60 and the bottom of the main valve stem 30 such that the micro-spring 70 is compressed and accumulates spring force when the main valve stem 30 moves in the initial idle stroke A1.

Furthermore, a main spring positioning frame 32 for positioning the main spring 40 is fixedly arranged on the periphery of the main valve rod 30 relative to the upstream of the main valve plug 60, and the top pulling part 31 is arranged on one side edge of the bottom of the main spring positioning frame 32; a ring frame 66 is provided around the top surface of the main valve plug 60, and the stopper 61 is provided on the edge of the ring frame 66 opposite to the top pulling portion 31.

Referring to fig. 22 to 25, in a sixth embodiment of the present invention, a moving space A3 is provided inside the main valve plug 60, the bottom of the main valve stem 30 is located downstream of the main valve plug 60 after passing through the moving space A3, and an elastic airtight membrane 65 surrounding the main valve stem 30 is provided to extend from the bottom of the moving space A3 to the main valve plug 60, so that the main valve plug 60 and the main valve stem 30 can maintain an airtight state when the main valve stem 30 moves in an initial idle stroke A1.

In practice, the inner periphery of the elastic airtight diaphragm 65 can be fixed on the periphery of the main valve stem 30, so that when the main valve stem 30 moves in the initial idle stroke A1, the main valve stem 30 drives the elastic airtight diaphragm 65 to displace and deform A4, and does not drive the main valve plug 60, and besides effectively maintaining the airtight state therebetween, the main valve plug 60 simultaneously maintains the state of closing the main valve port 50.

The micro-spring 70 is disposed downstream of the main valve plug 60 and is supported between the main valve plug 60 and the bottom of the main valve stem 30, so that the micro-spring 70 is compressed and accumulates the biasing force when the main valve stem 30 moves in the initial idle stroke A1.

In this embodiment, a main spring positioning frame 32 capable of moving in the moving space A3 is fixed on the periphery of the main valve stem 30, the main spring positioning frame 32 is used for positioning the main spring 40, and the top pulling part 31 is arranged on one side edge of the bottom of the main spring positioning frame 32; the stopper 61 is formed by the main valve plug 60 projecting toward the center of the moving space A3 with respect to the top pulling portion 31.

Referring to fig. 18 and 22, the fifth and sixth embodiments differ from the other embodiments in that a secondary port 51 is bypassed downstream of the primary port 50. The top of the main valve stem 30 is connected with a movable iron core 34 which receives the magnetic field of the electromagnetic coil group 10 to move, and the top surface of the main valve stem 30 is provided with a sliding chamber 35, the bottom of the sliding chamber 35 is provided with a through hole 36 which runs through the inner periphery of the main valve port 50, a small holding iron core 37 is movably arranged in the sliding chamber 35, the center of the small holding iron core 37 is provided with a socket space A5 corresponding to the initial idle stroke A1, and the socket space A5 is communicated with the through hole 36 of the main valve stem 30.

A sub-valve rod 80 is slidably inserted into the receiving space A5 of the holding small iron core 37, and the sub-valve rod 80 is inserted through the through hole 36 of the main valve rod 30 and provided with a sub-valve plug 81 that constantly closes the sub-valve opening 51.

Referring to fig. 19 and 23, when the plunger 34 moves the main valve rod 30 toward the fixed core 20 in the initial idle stroke, the main valve rod 30 and the holding small plunger 37 move relative to the sub valve rod 80 and the sub valve plug 81 through the engaging space A5, and the sub valve plug 81 maintains the state of closing the sub valve port 51.

When the plunger 34 moves the main valve rod 30 toward the fixed core 20 in the valve-close stroke B1, the holding small core 37 is displaced toward the plunger 34 and is attracted as shown in fig. 20 and 24, and the sub-valve rod 80 and the sub-valve plug 81 are displaced to open the sub-valve port 51.

In the foregoing embodiments, the main valve plug 60 is not driven by the moving space A3, the accommodating space, and the like provided on the main valve plug 60 when the main valve stem 30 moves in the initial idle stroke A1, so that the main valve plug 60 maintains the closed state, but in order to avoid the main valve plug 60 from collapsing when the valve is sealed, the main valve plug 60 can be wrapped outside a rigid support 67 to increase the structural strength of the main valve plug 60, and the rigid support 67 can be integrally formed with the stopper 61 and/or the retainer ring 64, as shown in fig. 10, 14, 19, and 24, for example.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A near-suction type electromagnetic valve comprises a fixed iron core which can generate magnetic force when an electromagnetic coil group is electrified, a main valve rod which can be absorbed by the magnetic force and can move towards the fixed iron core, a main valve plug which is movably arranged on the main valve rod and is directly or indirectly propped by a main spring to close a main valve port, and a micro spring which is arranged between the main valve rod and the main valve plug, wherein the side edge of the main valve rod is provided with a top pull part, and a stopping part is arranged at the opposite position of the main valve plug; the method is characterized in that:

when the main valve rod moves to a near-suction valve-opening stroke relatively close to the fixed iron core, the top pulling part of the main valve rod abuts against the stopping part of the main valve plug, the top pulling part is driven to apply force to the stopping part through larger magnetic attraction between the fixed iron core and the main valve rod, the main valve plug is synchronously driven to deviate from the main valve opening, the upstream pressure and the downstream pressure of the main valve plug form a balanced state, and the accumulated elastic opening force is released through the micro spring to abut against the main valve plug to be far away from the main valve opening, so that the moving distance of an initial idle stroke is supplemented to open the valve.

2. The near-suction type solenoid valve according to claim 1, wherein the main valve plug is hollow to form a moving space corresponding to the initial idle stroke, and the bottom of the main valve stem is movably disposed in the moving space, so that when the main valve stem moves in the initial idle stroke, the bottom of the main valve stem moves in the moving space to maintain the main valve plug in a closed main valve port state; and

3. The near-suction solenoid valve according to claim 1, wherein the main stem has a hollow bottom forming a displacement space corresponding to the initial idle stroke; the top surface of the main valve plug is provided with a connecting rod movably arranged in the moving space, so that when the main valve rod moves in an initial idle stroke, the main valve rod can move relative to the connecting rod and the main valve plug through the moving space, and the main valve plug maintains the state of closing the main valve port; and

4. The near-suction type solenoid valve according to claim 2 or 3, wherein a main spring positioning frame for positioning a main spring is fixedly arranged on the periphery of the main valve rod, the bottom of the main spring positioning frame extends downwards to abut against the periphery of the side surface of the main valve plug and can be driven by the main valve rod to displace relative to the main valve plug, and the bottom end of the main spring positioning frame is bent towards the side surface of the main valve plug to form a hook shape to form the top pulling part; and

5. The near-suction solenoid valve according to claim 1, wherein the main valve plug has a concave top surface, and a moving space corresponding to the initial idle stroke is formed in the center of the top surface, a stop ring is fixed above the moving space, and the stop portion is disposed on one side of the stop ring;

6. The near-suction type solenoid valve according to claim 1, wherein the main valve plug is hollow to form a moving space corresponding to the initial idle stroke, and the stopper is formed by the protrusion of the main valve plug toward the center of the moving space;

7. The near-suction solenoid valve according to claim 5 or 6, wherein a main spring positioning frame for positioning the main spring is fixedly arranged on the periphery of the main valve rod.

8. The near-suction type solenoid valve according to claim 1, wherein the main valve plug has a receiving space therein, the bottom of the main valve stem is disposed downstream of the main valve plug after passing through the receiving space, and the main valve plug extends in the receiving space and is provided with an elastic airtight membrane surrounding the outer periphery of the main valve stem, so that the main valve plug and the main valve stem can maintain an airtight state during the initial idle stroke of the main valve stem;

the micro spring is arranged at the downstream of the main valve plug and is propped between the main valve plug and the bottom of the main valve rod; and

a main spring positioning frame for positioning a main spring is fixedly arranged on the periphery of the main valve rod relative to the upstream of the main valve plug, and the top pull part is arranged on one side edge of the bottom of the main spring positioning frame; the top surface of the main valve plug is provided with a ring frame, and the edge of the ring frame corresponding to the top pulling part is provided with the stopping part.

9. The near-suction type solenoid valve according to claim 1, wherein the main valve plug has a moving space therein, the bottom of the main valve stem is located downstream of the main valve plug after passing through the moving space, and the main valve plug extends relative to the bottom of the moving space and is provided with an elastic airtight membrane surrounding the periphery of the main valve stem, so that the airtight state can be maintained between the main valve plug and the main valve stem when the main valve stem moves in the initial idle stroke;

the main spring positioning frame is fixedly arranged on the periphery of the main valve rod and can move in a moving space, the main spring positioning frame is used for positioning the main spring, the top pulling part is arranged on one side edge of the bottom of the main spring positioning frame, and the inner part of the main valve plug protrudes towards the center of the moving space relative to the top pulling part to form the stopping part.

10. The near-suction solenoid valve as claimed in claim 1, wherein the main valve stem is opened by pulling the main valve plug laterally to tilt away from the main valve port when the top of the main valve stem abuts against the stop of the main valve plug.