CN218598938U

CN218598938U - Valve seat assembly, proportional solenoid valve and breathing machine

Info

Publication number: CN218598938U
Application number: CN202220922519.5U
Authority: CN
Inventors: 饶青超; 高贵锋; 王瑞强
Original assignee: Ambulanc Shenzhen Tech Co Ltd
Current assignee: Ambulanc Shenzhen Tech Co Ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2023-03-10
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a valve seat assembly, a proportional solenoid valve and a breathing machine, wherein the valve seat assembly comprises a valve seat, a valve core, a movable armature, an elastic sheet and a pressing piece; the valve seat is provided with an air inlet channel and an installation cavity, one end of the air inlet channel is an air inlet, the other end of the air inlet channel is communicated with the installation cavity, the wall of the installation cavity is provided with an air outlet, and one end of the installation cavity, which is far away from the air inlet channel, is provided with an opening; the valve core is arranged in the mounting cavity and blocks one end of the air inlet channel away from the air inlet, and the outer periphery of the valve core is provided with a limiting groove; one end of the movable armature iron penetrates through the valve core and extends to the air inlet channel, and the other end of the movable armature iron extends towards the opening direction of the mounting cavity; the elastic sheet is sleeved on the valve core, and the inner periphery of the elastic sheet is clamped in the limiting groove; the pressing piece is arranged on one side, close to the opening of the mounting cavity, of the elastic sheet and presses against the outer periphery of the elastic sheet. The utility model discloses technical scheme realizes the independent control of electromagnetism shell fragment pre-pressure, guarantees that every product pre-pressure and working range force curve are unanimous.

Description

Valve seat assembly, proportional solenoid valve and breathing machine

Technical Field

The utility model relates to a proportional valve technical field, in particular to disk seat subassembly, proportional solenoid valve and breathing machine.

Background

The respirator needs to control the gas flow output in the using process, and the proportional electromagnetic valve is arranged in the gas circuit and can adjust the gas flow. The proportional solenoid valve generally adopts a plane spring plate to be matched with a coil, the plane spring plate is clamped at the lower periphery of a movable armature or the periphery of a valve core, the movable armature can generate upward magnetic attraction force due to the matching of a static armature and the coil, and downward resistance (prepressing force) of the plane spring plate, the electromagnetic force of the coil is controlled by a given coil current, and then the movable armature and the valve core are pulled to move up and down, so that the movable armature and the valve core move to different positions in the range of an air gap (a space generated between the upper part of the movable armature and the static armature) and are matched with the plane spring plate to reach a balanced state, the position of the valve core is controlled, and the opening of the valve is controlled, thereby realizing the function of controlling the flow of output gas.

The plane shell fragment is installed in the disk seat top in current proportion solenoid valve, and the plane shell fragment needs the disk seat to install just can use and have pressure in the valve body, therefore the precompression can't effectively detect, can only calculate shell fragment pre-compaction deflection through cooperation size measurement, and the error is great.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a valve seat assembly, but aims at realizing that proportion solenoid valve plane shell fragment precompression can be adjusted alone, improves the product production qualification rate.

To achieve the above object, the utility model provides a valve seat assembly, valve seat assembly includes:

the valve seat is provided with an air inlet channel and an installation cavity, one end of the air inlet channel is an air inlet, the other end of the air inlet channel is communicated with the installation cavity, the cavity wall of the installation cavity is provided with an air outlet, and one end of the installation cavity, which is far away from the air inlet channel, is provided with an opening;

the valve core is arranged in the mounting cavity and used for plugging one end of the air inlet channel, which is far away from the air inlet, and the outer periphery of the valve core is provided with a limiting groove;

one end of the movable armature iron penetrates through the valve core and extends to the air inlet channel, and the other end of the movable armature iron extends towards the opening direction of the installation cavity;

the elastic sheet is sleeved on the valve core, and the inner periphery of the elastic sheet is clamped in the limiting groove; and

the pressing piece is arranged on one side, close to the opening of the installation cavity, of the elastic sheet and abuts against the outer periphery of the elastic sheet.

Optionally, the valve element is sleeved with the pressing element, and the middle of the surface of one side of the pressing element facing the elastic sheet is recessed towards a direction away from the elastic sheet.

Optionally, the valve seat assembly further includes a diaphragm, the movable armature includes a main body portion and an insertion portion, the main body portion and the insertion portion are connected, the insertion portion penetrates through the valve element, a periphery of one end of the main body portion abuts against the valve element, the other end of the main body portion extends towards the opening of the installation cavity, and the diaphragm is clamped at a joint of the main body portion and the valve element and covers the opening of the installation cavity.

Optionally, the valve seat assembly further includes a sealing element, and the sealing element is sleeved at one end of the valve element close to the air inlet channel and exposes the end of the insertion portion.

The utility model also provides a proportional solenoid valve, including valve seat subassembly and valve body subassembly, the valve body subassembly forms the first working chamber that shroud the moving armature to drive the moving armature to reciprocate in the extending direction of the first working chamber;

the proportional solenoid valve is provided with an opening state for driving the movable armature so as to drive the valve core to be far away from the air inlet channel to enable the air inlet to be communicated with the air outlet, and a closing state for disconnecting the movable armature so as to enable the valve core to block the air inlet channel.

Optionally, the disk seat subassembly includes the diaphragm, the diaphragm lid fits the opening of installation cavity, and the valve body subassembly lid closes the part of disk seat encloses to close and is formed with and holds the chamber, it is equipped with the gas storage passageway to move armature, the one end intercommunication of gas storage passageway inlet channel, the other end intercommunication hold the chamber.

Optionally, the valve body assembly includes a housing, a coil and a static armature, the housing is connected to one end of the valve seat and covers the opening of the installation cavity, the coil and the static armature are arranged in the housing, and the housing is depressed towards a direction away from the diaphragm towards the middle of one side surface of the diaphragm to form the accommodation cavity.

Optionally, the housing is formed with a second working chamber with an opening at one end, the coil is annularly arranged on a cavity wall of the second working chamber and extends along a length direction of the housing, the coil is formed with a magnetic space, the static armature is installed in the magnetic space, and the movable armature is inserted in the magnetic space and is arranged at an interval with the static armature to form an air gap.

Optionally, the valve body assembly further includes a magnetic conduction member, and the magnetic conduction member is annularly disposed on the wall of the working chamber close to the opening thereof, and abuts against the coil.

The utility model also provides a breathing machine, include as above ratio solenoid valve and gas circuit piece, the ratio solenoid valve install in the gas circuit piece.

The utility model discloses technical scheme is through installing the shell fragment in the installation intracavity of disk seat to the block is in the spacing inslot of case, utilizes the pressing piece to compress tightly its periphery, thereby makes the disk seat subassembly need not install and just can carry out the test of shell fragment pressure alone in other parts, has alleviateed assembly spare part apolegamy work load promptly, can utilize and stimulate armature and case to remove the pre-pressure variation curve of testing the shell fragment, and then realizes the independent control of electromagnetic shrapnel pre-pressure, guarantees that every product pre-pressure and working range force curve are unanimous.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a valve seat assembly according to the present invention;

FIG. 2 is a schematic structural view of the seat assembly of FIG. 1 from another perspective;

FIG. 3 is an exploded view of the valve seat assembly of FIG. 1;

FIG. 4 is a schematic structural diagram of an embodiment of the proportional solenoid valve of the present invention;

FIG. 5 is an exploded view of the valve body assembly and valve seat assembly of the proportional solenoid valve shown in FIG. 4;

FIG. 6 is a cross-sectional view of the proportional solenoid valve shown in FIG. 4;

FIG. 7 is a cross-sectional view of the proportional solenoid valve shown in FIG. 4.

The reference numbers indicate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a disk seat subassembly 1.

In the embodiment of the present invention, as shown in fig. 1 to 3, 6 and 7, the valve seat assembly 1 includes a valve seat 11, a valve element 12, a movable armature 13, an elastic sheet 14 and a pressing member 15; an air inlet channel 111 and an installation cavity 112 are formed on the valve seat 11, one end of the air inlet channel 111 is an air inlet 113, the other end of the air inlet channel is communicated with the installation cavity 112, an air outlet 114 is formed in the cavity wall of the installation cavity 112, and an opening is formed in one end, far away from the air inlet channel 111, of the installation cavity 112; the valve core 12 is arranged in the installation cavity 112 and blocks one end of the air inlet channel 111 far away from the air inlet 113, and a limiting groove 121 is formed in the outer periphery of the valve core 12; one end of the movable armature 13 penetrates through the valve core 12 and extends to the air inlet channel 111, and the other end extends towards the opening direction of the mounting cavity 112; the spring 14 is sleeved on the valve core 12, and the inner periphery of the spring 14 is clamped in the limiting groove 121; the pressing part 15 is disposed on one side of the elastic sheet 14 close to the opening of the mounting cavity 112, and presses against the outer periphery of the elastic sheet 14.

The valve seat 11 has two open ends, one open end and the other open end is an air inlet 113, the space between the open end and the air inlet 113 is an accommodating cavity 22, and the space between the air inlet 113 and the accommodating cavity 22 is an air inlet channel 111. The air outlet 114 is disposed between the air inlet 113 and the opening, and the air outlet 114 is communicated with the accommodating chamber 22, it can be understood that the air flows in through the air inlet 113, passes through the air inlet channel 111, enters the accommodating chamber 22, and then flows out of the air outlet 114 from the accommodating chamber 22. Intake passage 111 extends to the direction that holds chamber 22 along air inlet 113, can be connected with intake passage 111 through the intake pipe, and then holds the chamber 22 with gaseous follow air inlet 113 flow direction in, realizes in gaseous entering valve seat 11, and only need through the shutoff or open intake passage 111, can realize closing or opening the operation of admitting air to valve seat 11.

The valve core 12 and the movable armature 13 are both arranged in the accommodating cavity 22, the valve core 12 is arranged at the connecting position of the air inlet channel 111 and the accommodating cavity 22, the cross section shape of the valve core 12 is the same as that of the air inlet channel 111, the cross section area of the valve core 12 is larger than or equal to that of the air inlet channel 111, one end of the valve core 12 can be close to or far away from one side of the air inlet channel 111, which is far away from the air inlet 113, so that the connection relation of closing the air inlet channel 111 and opening the air inlet channel 111 and the accommodating cavity 22 through the valve core 12 can be realized, the on-off control of air inlet of the valve seat 11 is realized, or the air inlet amount is changed through the distance between one end of the valve core 12 and the air inlet channel 111. In this embodiment, the valve element 12 is a cylinder, the movable armature 13 penetrates through the valve element 12 and extends to the air inlet channel 111, the movable armature 13 is tightly connected with the valve element 12, that is, the movable armature 13 and the valve element 12 can move synchronously, and the valve element 12 can be controlled to move by controlling the movable armature 13 to move, so that the valve element 12 can be driven to move by controlling the movable armature 13 to reciprocate along the direction of the air inlet channel 111, and the air inlet channel 111 is sealed or opened, and further the on-off control of air inlet of the valve seat 11 is realized.

Further, the elastic sheet 14 is a planar elastic sheet 14, that is, the center of the elastic sheet 14 has an opening and the entire elastic sheet 14 has a deformation capability, and the elastic sheet 14 is sleeved on the valve element 12 through the opening, that is, the inner periphery of the elastic sheet 14 abuts against the outer periphery of the valve element 12. In this embodiment, the outer peripheral ring of the valve element 12 is provided with a limiting groove 121, and the inner peripheral edge of the elastic sheet 14 is engaged with the limiting groove 121, that is, the groove wall of the limiting groove 121 may have an upward or downward limiting force on the inner peripheral edge of the elastic sheet 14, so as to limit the elastic sheet 14 to move up and down, and further the elastic sheet 14 may have an elastic limiting effect on the valve element 12.

Further, the valve seat assembly 1 further includes a pressing member 15, the pressing member 15 also has an opening in the center, the pressing member 15 is sleeved on the valve core 12 through the opening, and the outer periphery of the pressing member 15 abuts against the cavity wall of the accommodating cavity 22, so that the pressing member 15 is tightly connected with the valve seat 11. The pressing member 15 presses the outer periphery of the elastic sheet 14 toward the surface of one side of the elastic sheet 14, so that the outer periphery of the elastic sheet 14 is limited to the same height as the pressing member 15, and the inner periphery of the elastic sheet 14 can move upwards along with the valve core 12. When the valve core 12 is subjected to upward pulling force, the air inlet channel 111 is communicated with the accommodating cavity 22, the elastic sheet 14 moves upwards along with the valve core 12, and the inner peripheral edge of the elastic sheet 14 is clamped in the limiting groove 121, so that the elastic sheet 14 has downward elastic deformation force for the valve core 12, after the upward pulling force of the valve core 12 disappears, the elastic sheet 14 recovers to drive the valve core 12 to recover, the valve core 12 blocks the air inlet channel 111, the air inlet channel 111 is not communicated with the accommodating cavity 22, the control over the valve core 12 can be realized through the elastic sheet 14, and downward pressure is applied to the valve core 12.

Further, as can be seen from the above, by adjusting the pressing degree of the pressing part 15 to the outer periphery of the elastic sheet 14, and further adjusting the pressing degree of the inner periphery of the elastic sheet 14, the larger the pressing degree of the elastic sheet 14 is, the larger the deformation force of the elastic sheet 14 is, that is, by adjusting the pressing degree of the pressing part 15 to the elastic sheet 14, the position relationship between the elastic sheet 14 and the valve element 12 can be adjusted, and further, the downward elastic force of the elastic sheet 14 to the valve element 12 is adjusted, that is, the pre-pressure of the elastic sheet 14. When the pressing degree of the pressing part 15 is larger, the pre-pressure of the elastic sheet 14 on the valve element 12 is larger, the corresponding force required for opening the air inlet channel 111 by the valve element 12 is also larger, the pre-pressure value of the elastic sheet 14 can be obtained through a force test for opening the valve element 12, the pre-pressures of the elastic sheets 14 of a plurality of different valve seat assemblies 1 can be the same by continuously adjusting the pressing distance of the pressing part 15, the specifications of different products are the same, and the effect of independently adjusting the pre-pressures of the elastic sheets 14 of the valve seat assemblies 1 is achieved.

The utility model discloses technical scheme is through installing shell fragment 14 in the installation cavity 112 of disk seat 11, and the block is in the spacing groove 121 of case 12, utilize press part 15 to compress tightly its periphery, thereby make disk seat subassembly 1 need not install and just can carry out the test of shell fragment 14 pressure alone in other parts, the work load of assembling spare part apolegamy has been alleviateed promptly, can utilize and stimulate armature 13 and case 12 to remove the pre-pressure variation curve of testing shell fragment 14, and then realize the independent control of 14 pre-pressures of electromagnetism shell fragment, guarantee that every product pre-pressure and working range force curve are unanimous.

In an embodiment of the present invention, as shown in fig. 3, 6, and 7, the pressing element 15 is sleeved on the valve core 12, and a middle portion of a side surface of the pressing element 15 facing the elastic piece 14 is recessed toward a direction away from the elastic piece 14.

The middle part of one side surface of the elastic sheet 14, which faces the pressing block, is sunken towards the direction departing from the elastic sheet 14, so that a space for synchronous movement of the elastic sheet 14 when the valve core 12 moves upwards is reserved, the outer peripheral edge of the elastic sheet 14 is fixed through the pressing block 15, the inner peripheral edge of the elastic sheet 14 moves upwards along with the valve core 12, the original position of the outer peripheral edge is kept, the inner peripheral edge is gradually higher than the outer peripheral edge along with continuous movement, the middle part of the surface of the pressing block 15 is sunken towards the direction departing from the elastic sheet 14 and just matched with the deformation position of the elastic sheet 14, the part of the elastic sheet 14 except the outer peripheral edge is not contacted with the pressing block 15 in the working process, so that the pressing block 15 and the elastic sheet 14 are not influenced mutually, the pressing effect of the pressing block 15 is kept, the elastic deformation capability of the elastic sheet 14 is also ensured, and the pressing block 14 does not influence the pressing block 15 in the working process.

In an embodiment of the present invention, as shown in fig. 1 to fig. 3, fig. 6, and fig. 7, the valve seat assembly 1 further includes a diaphragm 16, the movable armature 13 includes a main body portion 131 and an insertion portion 132 that are connected, the insertion portion 132 penetrates through the valve element 12, one end periphery of the main body portion 131 abuts against the valve element 12, the other end extends toward the opening direction of the installation cavity 112, and the diaphragm 16 is clamped at the joint of the main body portion 131 and the valve element 12 and covers the opening of the installation cavity 112.

The movable armature 13 includes a main body portion 131 and an insertion portion 132 connected, in the present embodiment, the cross-sectional area of the main body portion 131 is larger than the cross-sectional area of the insertion portion 132, and the cross-sectional area of the insertion portion 132 is the same as the area of the central opening of the valve core 12, so when the movable armature 13 is inserted into the valve core 12, the insertion portion 132 is inserted into the central opening of the valve core 12, and the peripheral edge of one end of the main body portion 131 abuts against one side surface of the valve core 12 away from the air intake channel 111. By such arrangement, the lateral relative movement of the movable armature 13 and the valve core 12 can be prevented, the vertical positions of the valve core 12 and the movable armature 13 are maintained, the vertical movement of the movable armature 13 is maintained, and the valve core 12 can successfully block the air inlet channel 111.

Further, diaphragm 16 blocks in the junction of main part 131 and case 12 to cover the opening of installation cavity 112, and the setting of diaphragm 16 can cover the opening of installation cavity 112, is used for sealing installation cavity 112 after valve seat assembly 1 combines with the valve body, prevents that the gas in installation cavity 112 from leaking, keeps installation cavity 112's gas tightness and closure.

In an embodiment of the present invention, as shown in fig. 6 and 7, the valve seat assembly 1 further includes a sealing member 17, the sealing member 17 is sleeved on one end of the valve core 12 close to the air inlet channel 111, and exposes an end of the insertion portion 132.

The seal 17 may be a packing, a gasket, or the like, and in this embodiment, the seal 17 is a packing. The sealing member 17 is disposed at one end of the valve core 12 close to the air inlet channel 111, when the valve core 12 blocks the air inlet channel 111, the sealing member 17 can prevent the air entering from the air inlet channel 111 from the air inlet 113 from flowing to the accommodating cavity 22 along the gap between the valve core 12 and the air inlet channel 111 and pinching, so that the air tightness and the sealing performance in the accommodating cavity 22 are maintained in the state that the valve core 12 blocks the air inlet channel 111, and the blocking effect of the valve core 12 on the air inlet channel 111 is ensured.

The present invention further provides a proportional solenoid valve 100, as shown in fig. 4 to 7, the proportional solenoid valve 100 includes a valve seat assembly 1 and a valve body assembly 2, the valve body assembly 2 is formed with a first working chamber 21 covering the movable armature 13, so as to drive the movable armature 13 to reciprocate in the extending direction of the first working chamber 21; the proportional solenoid valve 100 has an open state in which the movable armature 13 is driven to move the valve element 12 away from the air inlet passage 111 to communicate the air inlet 113 with the air outlet 114, and a closed state in which the movable armature 13 is disconnected to block the air inlet passage 111 with the valve element 12. The specific structure of the valve seat assembly 1 refers to the above embodiments, and since the proportional solenoid valve 100 adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The valve body component 2 covers one end of the valve seat 11, which is provided with an opening, of the valve seat 11, the valve body component 2 covers the position of the valve seat 11, which is a first working cavity 21, the valve body component 2 is connected with the movable armature 13, and then the movable armature 13 is driven to reciprocate in the extending direction of the first working cavity 21, the movable armature 13 moves to drive the valve core 12 to move, so that the valve core 12 blocks or opens the air inlet channel 111, and the valve core 12 can be driven to move to further block or open the air inlet channel 111 by controlling the movable armature 13 to reciprocate along the direction of the air inlet channel 111, so that the on-off control of air inlet of the valve seat 11 is realized.

Further, the opening of the valve core 12 is acted by electromagnetic force, the force of the plane elastic sheet 14 and air pressure so as to stably hover at a certain displacement, and the three forces are important factors for realizing control accuracy. Because the air pressure is mainly related to the inlet pressure and the stressed area, the valve body structure can be simplified into a fixed value when the valve body structure is fixed, and the matching relation between an electromagnetic force curve and a plane elastic sheet 14 curve is mainly considered. Because the electromagnetic force of the proportional valve electromagnet for the respirator is related to the air gap 26 of the armature and the magnitude of input current, a force curve is a nonlinear curve, the plane elastic sheet 14 can be matched with an electromagnetic force curve, and a displacement curve is also a nonlinear curve. After the valve seat assembly 1 and the valve body assembly 2 are installed, the coil 24 can be electrified, and due to the fact that a pre-pressure change curve of the elastic sheet 14 is obtained, corresponding electromagnetic force can be obtained by controlling the size of the air gap 26, and then the air gap 26 can be adjusted by adjusting the combination degree of the valve body assembly 2 and the valve seat assembly 1, and the effect of independently adjusting the air gap 26 is achieved.

In an embodiment of the present invention, as shown in fig. 4 to fig. 7, the valve seat assembly 1 includes a diaphragm 16, the diaphragm 16 covers the opening of the installation cavity 112, and encloses and closes the accommodation cavity 22 with the portion of the valve seat 11 covered by the valve body assembly 2, the movable armature 13 is provided with a gas storage channel 133, one end of the gas storage channel 133 communicates with the gas inlet channel 111, and the other end communicates with the accommodation cavity 22.

The part of the diaphragm 16 and the part of the valve body component 2 covering the valve seat 11 is enclosed to form an accommodating cavity 22, the aerodynamic force layout adopts a' balance type structure, the inlet pressure is led into the accommodating cavity 22 through the air storage channel 133, an acting force opposite to the air inlet pressure is formed on the diaphragm 16, and therefore partial plane shrapnel 14 precompression force is offset, as the movable armature 13 and the valve core 12 are subjected to the precompression of the shrapnel 14, the counter acting force of the diaphragm 16 is increased, the initial driving force of the static armature 25 is reduced, namely the static armature 25 attracts the current for starting the movable armature 13, the electromagnet can start the valve core 12 under the low power of 2.5W, and further, the energy consumption of the proportional electromagnetic valve 100 is reduced.

In an embodiment of the present invention, as shown in fig. 4 to 7, the valve body assembly 2 includes a housing 23, a coil 24 and a static armature 25, the housing 23 is connected to one end of the valve seat 11, and covers the opening of the mounting cavity 112, the coil 24 and the static armature 25 are disposed in the housing 23, and the housing 23 is recessed toward a direction away from the diaphragm 16 toward a middle portion of a side surface of the diaphragm 16 to form the accommodating cavity 22.

The shell 23 covers the opening of the mounting cavity 112, the coil 24 and the static armature 25 are arranged in the shell 23, and the iron core is arranged in the coil 24 by electrifying the coil 24, so that the iron core is provided with a magnetic field, and the magnetic field is also provided in the shell 23. The middle part of the surface of one side of the shell 23 facing the diaphragm 16 is concave towards the direction away from the diaphragm 16, on one hand, a containing cavity 22 is formed, and an acting force opposite to the air inlet pressure is formed on the diaphragm 16, so that partial plane elastic sheet 14 precompression force is counteracted, and the initial driving force of the static armature 25 is reduced; on the other hand, a space for the membrane 16 to synchronously move when the valve core 12 moves upwards is reserved, the middle part of the surface of the shell 23 is sunken towards the direction departing from the elastic sheet 14 and is just matched with the deformation position of the membrane 16, and the part of the membrane 16 except the outer periphery is not contacted with the pressing part 15 in the working process, so that the shell 23 and the elastic sheet 14 are not influenced mutually, the shell 23 is not influenced by the membrane 16 in the working process, and the elastic deformation capacity of the membrane 16 is also ensured.

In an embodiment of the present invention, as shown in fig. 4 to fig. 7, the housing 23 is formed with a second working chamber 231 with an open end, the coil 24 is annularly disposed on a wall of the second working chamber 231 and extends along a length direction of the housing 23, the coil 24 is formed with a magnetic space, the static armature 25 is installed in the magnetic space, the movable armature 13 is inserted into the magnetic space, and is provided with an air gap 26 at an interval with the static armature 25.

The housing 23 is formed with a second working chamber 231, a coil 24 is annularly arranged on the chamber wall of the second working chamber 231, a magnetic field is provided inside the coil 24 by electrifying the coil 24, a magnetic space is formed, and the static armature 25 is arranged in the magnetic space. Combine with valve seat assembly 1 through valve body assembly 2 to coil 24 circular telegram for have the magnetic field in the valve body assembly 2, through the degree that changes valve seat assembly 1 and valve body assembly 2 initial bonding, can change initial air gap 26, and then change the magnetic field size through changing different coil 24 electric currents, and then change air gap 26 size and case 12 degree of opening, realize the degree of opening and shutting to inlet channel 111 and holding chamber 22.

In an embodiment of the present invention, as shown in fig. 4 to 7, the valve body assembly 2 further includes a magnetic conduction member 27, and the magnetic conduction member 27 is annularly disposed on the working chamber close to the open chamber wall and abuts against the coil 24.

The magnetic conductive member 27 can extend the magnetic space in the second working chamber 231, so that the magnetic properties are uniformly distributed in the second working chamber 231, and the magnetic properties at all positions are kept substantially the same, thereby improving the working efficiency and working effect of the proportional solenoid valve 100.

The utility model also provides a breathing machine, including proportional solenoid valve 100 and gas circuit piece, proportional solenoid valve 100 is installed in the gas circuit piece.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the inventive concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A seat assembly for a solenoid valve, the seat assembly comprising:

the valve seat is provided with an air inlet channel and an installation cavity, one end of the air inlet channel is an air inlet, the other end of the air inlet channel is communicated with the installation cavity, the wall of the installation cavity is provided with an air outlet, and one end of the installation cavity, which is far away from the air inlet channel, is provided with an opening;

the valve core is arranged in the mounting cavity and blocks one end of the air inlet channel far away from the air inlet, and a limiting groove is formed in the outer periphery of the valve core;

2. The seat assembly as claimed in claim 1, wherein the pressing member is disposed around the valve core, and the pressing member is recessed toward a direction away from the resilient plate toward a middle portion of a side surface of the resilient plate.

3. The valve seat assembly of claim 2, further comprising a diaphragm, wherein the movable armature includes a main body portion and an insertion portion connected to each other, the insertion portion is inserted into the valve core, a peripheral edge of one end of the main body portion abuts against the valve core, the other end of the main body portion extends toward the opening of the installation cavity, and the diaphragm is clamped at a joint of the main body portion and the valve core and covers the opening of the installation cavity.

4. The seat assembly of claim 3, further comprising a sealing member disposed around an end of the valve plug adjacent to the inlet passage and exposing an end of the insert portion.

5. A proportional solenoid valve comprising a valve seat assembly according to any one of claims 1 to 4 and a valve body assembly formed with a first working chamber covering the movable armature to drive the movable armature to reciprocate in an extending direction of the first working chamber;

6. The proportional solenoid valve of claim 5, wherein the valve seat assembly comprises a diaphragm, the diaphragm covers the opening of the mounting cavity and encloses with the valve body assembly covering the valve seat to form an accommodating cavity, the movable armature is provided with a gas storage channel, one end of the gas storage channel is communicated with the gas inlet channel, and the other end of the gas storage channel is communicated with the accommodating cavity.

7. The proportional solenoid valve of claim 6, wherein the valve body assembly includes a housing, a coil, and a stationary armature, the housing being connected to one end of the valve seat and covering an opening of the mounting chamber, the coil and the stationary armature being disposed in the housing, a middle portion of one side surface of the housing facing the diaphragm being recessed toward a direction away from the diaphragm to form the accommodation chamber.

8. The proportional solenoid valve of claim 7, wherein said housing defines a second working chamber with an open end, said coil is disposed around a wall of said second working chamber and extends along a length direction of said housing, said coil defines a magnetic space, said static armature is mounted in said magnetic space, said dynamic armature is inserted into said magnetic space and spaced from said static armature to define an air gap.

9. The proportional solenoid valve of claim 8, wherein the valve body assembly further comprises a magnetic conductor disposed around the working chamber adjacent the open chamber wall and abutting the coil.

10. A ventilator comprising a proportional solenoid valve according to any one of claims 5 to 9 and an air circuit block to which the proportional solenoid valve is mounted.