CN211315214U

CN211315214U - Valve element assembly and electromagnetic valve

Info

Publication number: CN211315214U
Application number: CN201922450394.1U
Authority: CN
Inventors: 周骥; 王勇刚
Original assignee: Hexing Automotive Electronics Taicang Co ltd
Current assignee: Hexing Automotive Electronics Taicang Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-21
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a valve core assembly and a solenoid valve, wherein the valve core assembly comprises a first magnetic conduction part, a valve seat and a second magnetic conduction part; the solenoid valve includes a spool assembly. A first through hole vertically penetrates through the first magnetic conduction component; the valve seat is provided with a second through hole and a third through hole. In the valve core assembly with the structure, in an initial state, the lower surface of the second magnetic conduction part abuts against the upper part of the second through hole to block the second through hole, and the third through hole is communicated with the first through hole through the vent groove to form an airflow channel; when the electromagnetic valve is electrified, the upper surface of the second magnetic conduction component moves upwards and abuts against the lower part of the first through hole to block the first through hole, and the second through hole is communicated with the third through hole to form an airflow channel. Compared with the prior art that the air flow channel is completely arranged on the valve body outside the magnetic conduction component, the valve core component with the structure has the advantages of simple and compact structure, space saving and capability of being applied to occasions with smaller space.

Description

Valve element assembly and electromagnetic valve

Technical Field

The utility model relates to a solenoid valve technical field, concretely relates to case subassembly and solenoid valve.

Background

The two-position three-way electromagnetic valve is mainly used for closing or connecting media, the two-position three-way electromagnetic valve has two different working positions when a valve core assembly of the electromagnetic valve is opened and closed, the three-way electromagnetic valve is provided with three channel ports, and a channel communicated between any two channel ports in the electromagnetic valve is called as a working channel.

The two-position three-way electromagnetic valve in the prior art comprises a valve body, a piston assembly, a coil magnetism isolating assembly and a valve port device, wherein the coil magnetism isolating assembly is arranged at the upper part of the valve body; the piston assembly comprises a movable iron core, an iron core spring, a piston spring and a piston body, one end of the movable iron core is movably arranged in the coil magnetism isolating assembly, and the other end of the movable iron core sequentially penetrates through the movable sealing assembly, the valve port device and the piston body and is fixedly connected with the piston body. The piston body is used for sealing the upper valve port and the lower valve port.

The two-position three-way electromagnetic valve with the structure needs to be provided with a valve body with a large volume, the valve body is arranged on the outer side of the lower part of the movable iron core, a circulation channel of an electromagnetic valve medium is arranged on the valve body outside the movable iron core, and the movable sealing assembly, the piston spring and the piston body are also arranged on the valve body outside the movable iron core, so that the overall structure of the electromagnetic valve is complex and large in volume.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the solenoid valve structure among the prior art is complicated, bulky.

Therefore, the utility model provides a valve core component, include

The first magnetic conduction component is vertically provided with a first through hole in a penetrating manner;

the valve seat is provided with a second through hole and a third through hole; and

the second magnetic conducting component is arranged between the first magnetic conducting component and the valve seat, is vertically arranged at one end of the first magnetic conducting component and can block the first through hole or the second through hole, is vertically provided with a vent groove communicated with the third through hole, and is staggered with the first through hole in the horizontal direction.

Optionally, the valve core assembly further includes a guide sleeve, the second magnetic conducting part is slidably disposed in the guide sleeve, and the first magnetic conducting part and the valve seat are respectively disposed inside two opposite ends of the guide sleeve.

Optionally, in the valve core assembly, an elastic member is disposed between the first magnetic conducting member and the second magnetic conducting member, one end of the elastic member abuts against the first magnetic conducting member, and the other end of the elastic member abuts against the second magnetic conducting member.

Optionally, in the valve core assembly, an end surface of the first magnetic conducting member facing the second magnetic conducting member and an end surface of the second magnetic conducting member facing the first magnetic conducting member are respectively provided with a first groove, and the elastic member is embedded in the first groove.

Optionally, in the valve core assembly, a first sealing element is disposed at a first end of the second magnetic conducting member close to the first magnetic conducting member, and a second sealing element is disposed at a second end of the second magnetic conducting member far away from the first magnetic conducting member; the first end and the second end are respectively provided with an inward second groove, and the first sealing element and the second sealing element are respectively embedded in the second grooves.

Optionally, in the valve core assembly, the first through hole is disposed in the center of the first magnetic conductive member, and the vent groove is disposed around the circumference of the second magnetic conductive member.

Optionally, in the valve core assembly, the vent groove is disposed on an outer wall surface of the second magnetically permeable member.

Optionally, in the valve core assembly described above, the vent groove is disposed in the second magnetically permeable member and located outside the second groove.

Optionally, in the valve core assembly, the second through hole is disposed in the center of the valve seat, the third through hole has a plurality of third through holes, and the plurality of third through holes are distributed at intervals in the circumferential direction of the valve seat; and/or

The cross-sectional area of the third through holes is larger than that of the first through holes.

The utility model provides a solenoid valve, including any one of the aforesaid case subassembly.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a valve core component, which comprises a first magnetic conduction part, a valve seat and a second magnetic conduction part, wherein a first through hole is vertically penetrated through the first magnetic conduction part; the valve seat is provided with a second through hole and a third through hole; the second magnetic conduction part can move towards the first magnetic conduction part or the valve seat, the second magnetic conduction part is arranged between the first magnetic conduction part and the valve seat, the second magnetic conduction part is vertically arranged at one end of the first magnetic conduction part and can block the first through hole or the second through hole, the second magnetic conduction part is vertically provided with a vent groove communicated with the third through hole, and the vent groove and the first through hole are arranged in a staggered mode in the horizontal direction.

The valve core assembly with the structure has the advantages that the first through hole and the vent groove are directly arranged on the magnetic conduction component, and the second through hole and the third through hole are arranged on the valve seat. In an initial state, the lower surface of the second magnetic conduction component abuts against the upper side of the second through hole to block the second through hole, and the third through hole is communicated with the first through hole through the vent groove to form an airflow channel; when the electromagnetic valve is electrified, the upper surface of the second magnetic conduction component moves upwards and abuts against the lower part of the first through hole to block the first through hole, and the second through hole is communicated with the third through hole to form an airflow channel. Compared with the prior art that the air flow channel is completely arranged on the valve body outside the magnetic conduction component, the valve core component with the structure has the advantages of simple and compact structure, space saving and capability of being applied to occasions with smaller space.

2. The utility model provides a case subassembly, air channel set up in second magnetic conduction part's circumference, and inside the air channel was located outside the first recess, the outer wall of second magnetic conduction part, the air channel formed the side confined air vent at second magnetic conduction part is inside, under the not on state, feeds through first through-hole and third through-hole. After the electromagnetic valve is electrified, the magnetic circuit exists on the circumferential outer wall surface of the second magnetic conduction component, the vent groove is formed in the circumferential inner portion of the second magnetic conduction component, no groove is formed in the circumferential outer wall surface of the second magnetic conduction component, the magnetic circuit exists on the circumferential outer wall surface of the second magnetic conduction component, the external magnetic field is uniformly distributed, and the second magnetic conduction component moves upwards more stably after the electromagnetic valve is electrified.

3. The utility model provides a solenoid valve, it includes case subassembly, skeleton, coil, cartridge type yoke, locating plate and plane yoke. Wherein, the section of thick bamboo type yoke is located the outside, and the skeleton is fixed at the section of thick bamboo type yoke inboard, and the coil is around establishing on the skeleton, and the locating plate setting is in section of thick bamboo type yoke bottom, and the plane yoke setting is on plane yoke top.

The electromagnetic valve with the structure has the advantages that the first through hole and the vent groove are directly arranged on the magnetic conducting component, and the second through hole and the third through hole are arranged on the valve seat. Compared with the prior art that all the air flow channels are arranged on the valve body outside the magnetic conduction component, the electromagnetic valve with the structure has the advantages of simple and compact structure, space saving and capability of being applied to occasions with smaller space.

Drawings

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

Fig. 1 is a sectional view of a valve element assembly provided in embodiment 1 of the present invention;

fig. 2 is a schematic perspective view of a valve core assembly provided in embodiment 1 of the present invention;

FIG. 3 is a schematic perspective view of the valve core assembly with the guide sleeve removed;

FIG. 4 is a perspective view of a valve seat;

fig. 5 is a sectional view of a solenoid valve provided in embodiment 2 of the present invention;

fig. 6 is a schematic perspective view of an electromagnetic valve provided in embodiment 2 of the present invention;

description of reference numerals:

1-a first magnetically permeable member; 11-a first via; 2-valve seat; 21-a second via; 22-a third via; 3-a second magnetically permeable component; 31-a vent channel; 4-guide sleeve; 5-an elastic member; 61-a first seal; 62-a second seal; 71-a backbone; 72-a coil; 73-cylindrical yoke; 74-a positioning plate; 75-planar yoke.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a valve core assembly, as shown in fig. 1 to 4, which includes a first magnetic conductive member 1, a valve seat 2, and a second magnetic conductive member 3.

Wherein, a first through hole 11 vertically penetrates through the first magnetic conduction component 1; the valve seat 2 is provided with a second through hole 21 and a third through hole 22; the second magnetic conduction part 3 can move towards the first magnetic conduction part 1 or the valve seat 2, the second magnetic conduction part 3 is arranged between the first magnetic conduction part 1 and the valve seat 2, the second magnetic conduction part 3 is vertically arranged at one end of the first magnetic conduction part 1 and can block the first through hole 11 or the second through hole 21, the second magnetic conduction part 3 is vertically provided with a vent groove 31 communicated with the third through hole 22, and the vent groove 31 and the first through hole 11 are arranged in a staggered mode in the horizontal direction.

In the valve core assembly with the structure, the first through hole 11 and the vent groove 31 are directly arranged on the magnetic conduction component, and the second through hole 21 and the third through hole 22 are arranged on the valve seat. In an initial state, the lower surface of the second magnetic conduction part 3 abuts against the upper part of the second through hole 21 to seal the second through hole 21, and the third through hole 22 is communicated with the first through hole 11 through the vent groove 31 to form an airflow channel; when the valve core assembly is applied to the electromagnetic valve, when the electromagnetic valve is electrified, the upper surface of the second magnetic conduction part 3 moves upwards and abuts against the lower part of the first through hole 11 to block the first through hole 11, and the second through hole 21 is communicated with the third through hole 22 to form an airflow channel. Compared with the prior art that the air flow channel is completely arranged on the valve body outside the magnetic conduction component, the valve core component with the structure has the advantages of simple and compact structure, space saving and capability of being applied to occasions with smaller space.

Specifically, referring to fig. 1 and 2, the valve core assembly further includes a guide sleeve 4, an elastic member 5, a first seal 61 and a second seal 62; the first magnetic conduction component 1 is a first iron core, and the second magnetic conduction component 3 is a second iron core.

Wherein, first magnetic conduction part 1 and disk seat 2 set up inside the relative both ends of guide pin bushing 4 respectively, and first magnetic conduction part 1 welded fastening is in guide pin bushing 4, and guide pin bushing 4 is exposed to the upper end of first magnetic conduction part 1, and second magnetic conduction part 3 is located between first magnetic conduction part 1 and the disk seat 2 and sets up in guide pin bushing 4 slidable.

First grooves are respectively formed in one end face, facing the second magnetic conducting part 3, of the first magnetic conducting part 1 and one end face, facing the first magnetic conducting part 1, of the second magnetic conducting part 3, the elastic part 5 is stably embedded in the first grooves, the upper end and the lower end of the elastic part 5 are respectively abutted to the groove bottom of the first grooves, and the elastic part 5 is a spring, for example.

Second magnetic conduction part 3 is close to first end of first magnetic conduction part 1 and second magnetic conduction part 3 and keeps away from second end of first magnetic conduction part 1 and is equipped with the second recess respectively, and first sealing member 61 inlays and puts in the second recess of first end, and second sealing member 62 assembles and inlays and put in the second recess of second end, compares first sealing member 61 and second sealing member 62 vulcanization moulding on second magnetic conduction part 3 among the prior art, simple process, with low costs. For example, the first sealing element 61 and the second sealing element 62 are both sealing gaskets, and the first end and the second end of the second magnetic conducting component 3 are both provided with sealing gaskets, so that in an initial state that the electromagnetic valve is not electrified, the second sealing element 62 seals and blocks the second through hole 21, and air leakage of the second through hole 21 is prevented; after the electromagnetic valve is electrified, the first through hole 11 is sealed and blocked by the first sealing element 61, air leakage of the first through hole 11 is prevented, and the sealing performance is improved.

For example, the material of guide pin bushing is stainless steel, and the guide pin bushing wearability is good, and second magnetic conduction part slides in the guide pin bushing, and the case subassembly is used in the solenoid valve, and the solenoid valve includes the skeleton of plastics material, and the guide pin bushing setting is inboard at the skeleton of solenoid valve, and the setting of guide pin bushing can prevent first magnetic conduction part and second magnetic conduction part snap-on the skeleton, and second magnetic conduction part slides from top to bottom and leads to the wearing and tearing of plastics skeleton.

The first through hole 11 is provided at the center of the first magnetic conductive member 1, and the ventilation grooves 31 are provided in plurality, and the ventilation grooves 31 are provided around the circumference of the second magnetic conductive member 3. Referring to fig. 3, the ventilation groove 31 is provided on the outer wall surface of the second magnetic conductive member 3, the ventilation groove 31 and the inner wall surface of the guide bush 4 enclose a closed ventilation hole, and the first through hole 11 and the third through hole 22 are communicated through the ventilation hole in the energized state of the electromagnetic valve.

Preferably, the second through hole 21 is provided at the center of the valve seat 2, the third through hole 22 has a plurality, and the plurality of third through holes 22 are evenly distributed at intervals in the circumferential direction of the valve seat 2; the plurality of third through holes 22 have a cross-sectional area larger than that of the first through holes 11, and ensure sufficient gas supply into the first through holes 11 when the gas flows from the third through holes 22 to the first through holes 11, and control the flow rate of the gas flowing out of the first through holes 11 through the first through holes 11.

As a first alternative embodiment of embodiment 1, only one, two, three, etc. may be provided for the third through holes 22, as long as gas can flow from the third through holes 22 to the first through holes 11 when not energized, and from the second through holes 21 to the third through holes 22 when energized. As a modification, the cross-sectional area of the third through-hole 22 may also be smaller than the cross-sectional area of the first through-hole 11, the flow rate of the gas flowing to the first through-hole 11 being controlled by the third through-hole 22; or the cross-sectional area of the third through-hole 22 may also be equal to the cross-sectional area of the first through-hole 11.

As a second alternative embodiment of example 1, the ventilation groove 31 may not be provided along the circumferential direction of the second magnetic conductive member 3, the ventilation groove 31 may be provided in the second magnetic conductive member 3 with the first groove position being shifted, and the ventilation groove 31 may be provided with the first through hole 11 being shifted in the horizontal direction, and in the non-energized state, the ventilation groove 31 may communicate with the first through hole 11 and the third through hole 22, and in the energized state, the first seal 61 may seal the first through hole 11 to block the communication between the ventilation groove 31 and the first through hole 11.

As a third alternative embodiment of the embodiment 1, the first seal 61 or the second seal 62 may also be vulcanization molded on the second magnetic conductive member 3, or both the first seal 61 and the second seal 62 may be vulcanization molded on the second magnetic conductive member 3. As a modification, the first seal 61 or the second seal 62 may not be provided, or neither the first seal 61 nor the second seal 62 may be provided, and the end surface of the second magnetically permeable member 3 close to the second through hole 21 may block the second through hole 21 in the deenergized state, and the end surface of the second magnetically permeable member 3 close to the first magnetically permeable member 1 may block the first through hole 11 in the energized state. Or when the first sealing element is not arranged, the end face, close to the first magnetic conduction component, of the second magnetic conduction component is provided with non-magnetic conduction metals such as a copper sheet and the like, so that the second magnetic conduction component is prevented from contacting with the first magnetic conduction component when moving towards the first magnetic conduction component after the electromagnetic valve is electrified, the electromagnetic force between the second magnetic conduction component and the first magnetic conduction component is large, and when the electromagnetic valve is powered off again, the second magnetic conduction component cannot be separated from the first magnetic conduction component in time and moves downwards to block the second.

As a fourth alternative embodiment of embodiment 1, the elastic member 5 may also be directly embedded between the first magnetic conductive member 1 and the second magnetic conductive member 3 without providing the first groove, that is, the upper end of the elastic member is fixed on the first magnetic conductive member, and the lower end of the elastic member is fixed on the second magnetic conductive member; or a guide post is arranged at one end of the first magnetic conduction part close to the second magnetic conduction part, or a guide post is arranged at one end of the second magnetic conduction part close to the first magnetic conduction part, or guide posts are arranged at one ends of the first magnetic conduction part and the second magnetic conduction part close to each other, and the elastic part is sleeved on the guide posts to install the fixing spring.

As a fifth alternative embodiment of embodiment 1, the guide sleeve 4 may not be provided, the valve core assembly is applied to the electromagnetic valve, the first magnetic conductive member 1 is fixedly disposed on the framework of the electromagnetic valve, the second magnetic conductive member 3 can slide toward the first magnetic conductive member 1 or the valve seat 2, and the airflow channel is directly disposed on the magnetic conductive member, so that the valve core assembly has a simple and compact structure, saves space, and can be applied to a smaller space.

As a sixth alternative embodiment of example 1, the first and second magnetic

permeable members

1 and 3 may be an iron-silicon alloy, an iron-aluminum alloy, a nickel-iron alloy, or the like, in addition to a pure iron core; as long as the valve core assembly is applied to the electromagnetic valve, after the electromagnetic valve is energized, the first magnetic conducting part 1 and the second magnetic conducting part 3 can generate magnetic field force to enable the second magnetic conducting part 3 to move upwards.

Example 2

The present embodiment provides a valve core assembly, which is different from the valve core assembly in embodiment 1 in that a vent groove 31 is formed in the circumferential direction of the second magnetic conductive member 3, the vent groove 31 is located outside the first groove and inside the outer wall surface of the second magnetic conductive member 3, the vent groove 31 forms a vent hole with a closed side inside the second magnetic conductive member 3, and the vent groove communicates the first through hole 11 and the third through hole 22 in a non-energized state. After the solenoid valve is energized, a magnetic path exists on the circumferential outer wall surface of the second magnetic conductive member 3, and since the vent groove 31 is formed in the slotted manner of the vent groove 31 in embodiment 1, there is no magnetic path in the vent groove 31, the magnetic field outside the second magnetic conductive member 3 is unevenly distributed, and the upward movement is not smooth enough. The ventilation groove 31 of embodiment 2 is provided in the circumferential inner portion of the second magnetic conductive member 3, the circumferential outer wall surface of the second magnetic conductive member 3 has no groove, the circumferential outer wall surfaces of the second magnetic conductive members 3 have magnetic paths, the external magnetic field distribution is uniform, and the upward movement of the second magnetic conductive member 3 is more stable after the electromagnetic valve is energized.

Example 3

The present embodiment provides a solenoid valve, as shown in fig. 5 and 6, which includes the spool assembly, the bobbin 71, the coil 72, the cylinder yoke 73, the positioning plate 74, and the planar yoke 75 in embodiment 1.

The cylindrical yoke 73 is located at the outermost side, the frame 71 is fixed inside the cylindrical yoke 73, the coil 72 is wound on the frame 71, the positioning plate 74 is arranged at the bottom end of the cylindrical yoke 73, and the planar yoke 75 is arranged at the top end of the cylindrical yoke 73.

In the solenoid valve with the structure, the first through hole 11 and the vent groove 31 are directly arranged on the magnetic conduction component, and the second through hole 21 and the third through hole 22 are directly arranged on the valve seat. Compared with the prior art that all the air flow channels are arranged on the valve body outside the magnetic conduction component, the electromagnetic valve with the structure has the advantages of simple and compact structure, space saving and capability of being applied to occasions with smaller space.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A valve core component is characterized by comprising

The magnetic conduction component comprises a first magnetic conduction component (1), wherein a first through hole (11) vertically penetrates through the first magnetic conduction component (1);

the valve seat (2), wherein a second through hole (21) and a third through hole (22) are formed in the valve seat (2); and

can be towards first magnetic conduction part (1) or second magnetic conduction part (3) that valve seat (2) removed, second magnetic conduction part (3) are located first magnetic conduction part (1) with between valve seat (2), its vertical set up in the one end of first magnetic conduction part (1) and can the shutoff first through-hole (11) or second through-hole (21), just second magnetic conduction part (3) vertical be equipped with vent groove (31) that third through-hole (22) are linked together, vent groove (31) with first through-hole (11) stagger the setting on the horizontal direction.

2. The valve core assembly of claim 1, further comprising a guide sleeve (4), wherein the second magnetically conductive member (3) is slidably disposed in the guide sleeve (4), and wherein the first magnetically conductive member (1) and the valve seat (2) are respectively disposed inside opposite ends of the guide sleeve (4).

3. The valve core assembly according to claim 1 or 2, wherein an elastic member (5) is arranged between the first magnetic conducting member (1) and the second magnetic conducting member (3), one end of the elastic member (5) is abutted against the first magnetic conducting member (1), and the other end is abutted against the second magnetic conducting member (3).

4. The valve core assembly of claim 3, wherein a first groove is formed in an end surface of the first magnetic conduction component (1) facing the second magnetic conduction component (3) and a side end surface of the second magnetic conduction component (3) facing the first magnetic conduction component (1), and the elastic member (5) is embedded in the first groove.

5. The spool assembly of claim 1 or 2, wherein a first seal (61) is provided at a first end of the second magnetically permeable member (3) close to the first magnetically permeable member (1), and a second seal (62) is provided at a second end of the second magnetically permeable member (3) far from the first magnetically permeable member (1); the first end and the second end are respectively provided with an inward second groove, and the first sealing element (61) and the second sealing element (62) are respectively embedded in the second grooves.

6. The spool assembly of claim 5, wherein the first through hole (11) is provided at the center of the first magnetically permeable member (1) and the vent groove (31) is provided around the circumference of the second magnetically permeable member (3).

7. The spool assembly of claim 6, wherein the vent groove (31) is provided on an outer wall surface of the second magnetically permeable member (3).

8. The spool assembly of claim 6, wherein the vent groove (31) is provided in the second magnetically permeable member (3) outside the second recess.

9. The valve core assembly according to claim 1 or 2, characterized in that the second through hole (21) is arranged at the center of the valve seat (2), the third through hole (22) has a plurality, and the plurality of third through holes (22) are distributed at intervals in the circumferential direction of the valve seat (2); and/or

The cross-sectional area of the third through-holes (22) is larger than that of the first through-holes (11).

10. A solenoid valve comprising a cartridge assembly according to any one of claims 1 to 9.