Switch and proportional combined electromagnetic valve

Abstract

The invention provides a switch and proportional combined electromagnetic valve which is characterized in that a switch electromagnetic valve and a proportional electromagnetic valve are integrally designed, the upper half part is controlled by a switch valve, and the lower half part is controlled by a proportional valve; the whole structure mainly comprises a movable iron core 1, a switch electromagnetic valve excitation coil 2, an electromagnetic valve main magnetic pole 4, a switch electromagnetic valve auxiliary magnetic pole 3, a switch electromagnetic valve reset spring 8, a proportional electromagnetic valve excitation coil 5, a proportional electromagnetic valve auxiliary magnetic pole 6, an armature 7, a proportional electromagnetic valve reset spring 9 and the like. The switch and proportion combined electromagnetic valve has multiple working modes, can be flexibly switched and can be suitable for multiple working environments; meanwhile, the structure has the characteristics of low damping force and low eddy-current loss, and has good switch response speed; in addition, the armature 7 adopts a three-section structure of an upper cone, a lower cone and a cylinder, and has the prominent characteristic that the problem that the constant force characteristic of the proportional electromagnetic valve is reduced because the electromagnetic force is rapidly increased when the later displacement of the armature 7 is increased can be solved.

Description

Technical Field

[0001] The invention belongs to the field of electromagnetic mechanism design, and relates to an electric-mechanical conversion mechanism of an automatic control system, in particular to a switch and proportional combined electromagnetic valve. Background Art

[0002] The switch and proportional combination solenoid valve is an automatic control element that uses the electromagnetic principle to control the on and off of fluids. It is widely used in industrial automation, machinery manufacturing, automobiles, home appliances, etc. Because traditional solenoid valves usually only have one form, a single switch solenoid valve or a proportional solenoid valve. For example, if there is only a switch solenoid valve, although its structure is simple and the response speed is fast, it cannot achieve precise regulation of flow or pressure; and if there is only a proportional solenoid valve, although it can adjust the flow or pressure according to the input signal to achieve fine control, the response speed of the proportional solenoid valve may be affected by the valve body design; in addition, when the switch solenoid valve is working, the main magnetic pole will generate a large eddy current, which will reduce the dynamic response speed of the solenoid valve on the one hand, and cause temperature rise and energy loss on the other hand (LIU P, ZHANG R, ZHAO Q, et al. Eddy effect and dynamic response of high-speed solenoid valve with composite iron core [J]. Materials, 2023, 16 (17): 5823.); and at the end of the stroke of the proportional solenoid valve, the electromagnetic force suddenly increases due to the rapid decrease in magnetic resistance, which makes the constant force characteristics easy to decrease, affecting its control accuracy (Wang Ruiting. Geometric parameter modeling analysis and performance optimization research of moving iron proportional electromagnet [D]. Mechanical Engineering of Wenzhou University, 2019.). Summary of the invention

[0003] In order to solve the above problems, the present invention provides a switch and proportional combined solenoid valve.

[0004] The object of the present invention is achieved in that:

[0005] A switch and proportional combined solenoid valve is proposed, which is characterized by:

[0006] It includes a moving iron core, a switch solenoid valve excitation coil, a solenoid valve main magnetic pole, a switch solenoid valve auxiliary magnetic pole, a switch solenoid valve reset spring, a proportional solenoid valve excitation coil, a proportional solenoid valve auxiliary magnetic pole, an armature, and a proportional solenoid valve reset spring;

[0007] The solenoid valve main magnetic poles include switch solenoid valve main magnetic poles and proportional solenoid valve main magnetic poles;

[0008] The main magnetic pole of the switch solenoid valve is in the shape of a hollow cylinder, and has four symmetrically distributed grooves along the circumferential direction at the end;

[0009] The main magnetic pole of the proportional solenoid valve is cylindrical, with a stepped hole in the center, which is composed of a circular hole and a conical hole;

[0010] The auxiliary magnetic pole of the switch solenoid valve is a circular ring structure;

[0011] The auxiliary magnetic pole of the proportional solenoid valve is a cylindrical structure with a round through hole at the bottom;

[0012] The switch solenoid valve excitation coil is placed between the switch solenoid valve auxiliary magnetic pole and the switch solenoid valve main magnetic pole;

[0013] The proportional solenoid valve excitation coil is placed between the proportional solenoid valve auxiliary magnetic pole and the proportional solenoid valve main magnetic pole;

[0014] The armature structure is composed of three sections, which are upper cone, lower cone and cylinder from top to bottom;

[0015] The moving iron core is a disc-shaped structure, and a ring groove is opened on the side close to the main magnetic pole of the switch solenoid valve, and holes are evenly spaced and distributed along the circumference, wherein the diameter r of the ring groove is larger than the outer diameter R of the main magnetic pole of the switch solenoid valve. 1 , but smaller than the inner diameter R of the auxiliary magnetic pole of the switch solenoid valve 2 ;

[0016] The switch solenoid valve reset spring is built into the main magnetic pole of the switch solenoid valve and can push the moving iron core to move;

[0017] The proportional solenoid valve reset spring is built into the main magnetic pole stepped hole of the proportional solenoid valve and can push the armature to move.

[0018] When the proportional solenoid valve excitation coil is not energized, only the upper cone of the armature is placed in the stepped hole of the main magnetic pole of the proportional solenoid valve; when the proportional solenoid valve excitation coil is energized, the main magnetic pole of the proportional solenoid valve, the auxiliary magnetic pole of the proportional solenoid valve and the armature are magnetized to generate the main magnetic flux Φ 1 , main magnetic flux Φ 1 Generate two partial magnetic flux Φ 2 and Φ 3 ; Magnetic flux Φ 2 The electromagnetic force F enters the main magnetic pole of the proportional solenoid valve through the air gap between the end face of the armature and the stepped hole of the main magnetic pole of the proportional solenoid valve, generating an axial electromagnetic force F acting on the end face of the armature. 1 , divided magnetic flux Φ 3 The electromagnetic force F acts on the upper cone surface of the armature and enters the main magnetic pole of the proportional solenoid valve through the air gap between the upper cone surface of the armature and the main magnetic pole of the proportional solenoid valve. 2 , electromagnetic force F 2 The electromagnetic force F in the axial and radial directions is induced 2z and F 2r , at this time the axial electromagnetic force F 1 and the electromagnetic force F 2Axial electromagnetic force F 2z Together they constitute the armature driving force; as the armature displacement increases, the lower cone of the armature also enters the main magnetic pole stepped hole of the proportional solenoid valve. At this time, the main magnetic flux Φ 1 Another magnetic flux Φ is generated 4 , divided magnetic flux Φ 4 The electromagnetic force F acting on the lower cone surface of the armature enters the main magnetic pole of the proportional solenoid valve through the air gap between the lower cone surface of the armature and the main magnetic pole of the proportional solenoid valve, generating an electromagnetic force F acting on the lower cone surface of the armature 3 , electromagnetic force F 3 Induced axial and radial electromagnetic forces F 3z and F 3r , at this time the axial electromagnetic force F 1 , electromagnetic force F 2 Axial electromagnetic force F 2z and the electromagnetic force F 3 Axial electromagnetic force F 3z The three together constitute the armature driving force; due to the electromagnetic force F 3 Axial electromagnetic force F 3z The three and the axial electromagnetic force F 1 , electromagnetic force F 2 Axial electromagnetic force F 2z The direction of action is opposite to that of the armature, which can suppress the problem of rapid increase of electromagnetic force caused by the increase of armature displacement in the later stage, resulting in a decrease in its constant force characteristics.

[0019] When the switch solenoid valve and the proportional solenoid valve work at the same time, current is passed through the switch solenoid valve excitation coil and the proportional solenoid valve excitation coil at the same time, generating magnetic flux Φ and magnetic flux Φ 1 , in the magnetic flux Φ and Φ 1 Under the action of the electromagnetic force, the moving iron core and the armature start to move together along the axial direction of their return springs under the action of the electromagnetic force.

[0020] When the switch solenoid valve works alone, current is passed through the switch solenoid valve excitation coil, and the switch solenoid valve main magnetic pole, the switch solenoid valve secondary magnetic pole and the moving iron core are magnetized to generate a magnetic flux Φ. The magnetic flux Φ starts from the switch solenoid valve main magnetic pole and enters the air gap under the moving iron core, and then goes to the switch solenoid valve secondary magnetic pole to form a closed loop; at this time, only the switch solenoid valve moves axially along the switch solenoid valve return spring under the action of electromagnetic force, while the armature is in a stationary state.

[0021] When the proportional solenoid valve works alone, the proportional solenoid valve excitation coil is energized while the switch solenoid valve excitation coil is not energized; at this time, only the armature moves axially along the proportional solenoid valve reset spring under the action of electromagnetic force while the moving iron core is in a stationary state.

[0022] The advantages of the present invention are:

[0023] 1. The switch and proportional combination solenoid valve proposed in the present invention combines the characteristics of the switch solenoid valve and the proportional solenoid valve, can achieve fast switch control, and can perform precise continuous adjustment. It has multiple working modes and is suitable for a wider range of application scenarios.

[0024] 2. In the switch and proportional combination solenoid valve proposed in the present invention, the main magnetic pole of the switch solenoid valve is provided with a groove, which can increase the resistance formed by the eddy current of the main magnetic pole of the switch solenoid valve and effectively reduce the eddy current loss; at the same time, the annular groove opened on the moving iron core expands the local distance between the moving iron core and the main magnetic pole of the switch solenoid valve, which can reduce the size of the oil film damping force exerted on the moving iron core in the oil environment and accelerate its dynamic response speed.

[0025] 3. The switch and proportional combination solenoid valve proposed in the present invention has an armature structure composed of three sections: an upper cone, a lower cone, and a cylinder. This can suppress the problem of a rapid increase in electromagnetic force caused by an increase in the displacement of the armature in the later stage, which leads to a decrease in its constant force characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a switch and proportional combination solenoid valve according to the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the moving iron core;

[0028] Figure 3 It is a schematic diagram of the combination of the main magnetic pole of the solenoid valve and the auxiliary magnetic pole of the switch solenoid valve;

[0029] Figure 4 It is the excitation schematic diagram of the initial working state of the proportional solenoid valve;

[0030] Figure 5 This is the excitation schematic diagram of the proportional solenoid valve when its stroke is close to the end;

[0031] Figure 6 This is a schematic diagram of simultaneous excitation of the switch and proportional solenoid valve;

[0032] Figure 7 This is a schematic diagram of separate excitation of the switch solenoid valve;

[0033] In the figure, 1: moving iron core; 2: switching solenoid valve excitation coil; 3: switching solenoid valve secondary magnetic pole; 4: solenoid valve main magnetic pole; 5: proportional solenoid valve excitation coil; 6: proportional solenoid valve secondary magnetic pole; 7: armature; 8: switching solenoid valve return spring; 9: proportional solenoid valve return spring; 10: hole of moving iron core; 11: annular groove of moving iron core; 12: groove of switching solenoid valve secondary magnetic pole; 41: switching solenoid valve main magnetic pole; 42: proportional solenoid valve main magnetic pole. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1-3 As shown, the present invention discloses a switch and proportional combined solenoid valve, specifically comprising: a moving iron core 1, a switch solenoid valve excitation coil 2, a solenoid valve main magnetic pole 4, a switch solenoid valve secondary magnetic pole 3, a switch solenoid valve reset spring 8, a proportional solenoid valve excitation coil 5, a proportional solenoid valve secondary magnetic pole 6, an armature 7, and a proportional solenoid valve reset spring 9. The solenoid valve main magnetic pole 4 includes a switch solenoid valve main magnetic pole 41 and a proportional solenoid valve main magnetic pole 42. The switch solenoid valve main magnetic pole 41 is a hollow cylinder, and has four symmetrically distributed grooves 12 along the circumferential direction at the end; the proportional solenoid valve main magnetic pole 42 is a cylinder, and has a stepped hole in the center, and the stepped hole is composed of a circular hole and a tapered hole. The switch solenoid valve secondary magnetic pole 3 is a circular ring structure; the proportional solenoid valve secondary magnetic pole 6 is a barrel structure, and has a circular through hole at the bottom. The switch solenoid valve excitation coil 2 is placed between the switch solenoid valve secondary magnetic pole 3 and the switch solenoid valve main magnetic pole 41; the proportional solenoid valve excitation coil 5 is placed between the proportional solenoid valve secondary magnetic pole 6 and the proportional solenoid valve main magnetic pole 42. The armature 7 structure consists of three sections, which are upper cone, lower cone and cylinder from top to bottom. The moving iron core 1 is a disc-shaped structure, and a ring groove 11 is opened on the side close to the switch solenoid valve main magnetic pole 41, and holes 10 are evenly spaced and distributed along the circumference, wherein the diameter r of the ring groove is greater than the outer diameter R of the switch solenoid valve main magnetic pole 1 , but smaller than the inner diameter R of the auxiliary magnetic pole 3 of the switch solenoid valve 2 The switch solenoid valve reset spring 8 is built into the switch solenoid valve main magnetic pole 41, which can push the moving iron core 1 to move; the proportional solenoid valve reset spring 9 is built into the stepped hole of the proportional solenoid valve main magnetic pole 42, which can push the armature 7 to move.

[0036] During operation, the moving iron core 1 is located in an oil environment. Since an annular groove 11 and a hole 10 are provided on the moving iron core 1, the local distance between the moving iron core and the main magnetic pole of the switch solenoid valve is enlarged on the one hand, and an additional flow channel is provided for the oil on the other hand, thereby reducing the fuel pressure on the surface of the moving iron core, reducing the damping force of the oil, and helping to improve the response speed of the switch solenoid valve. In addition, since the secondary magnetic pole 3 of the switch solenoid valve is provided with a groove 12, the closed loop of the induced eddy current in the main magnetic pole 41 of the switch solenoid valve during operation is cut off, which effectively increases the resistance of the eddy current loop, thereby reducing the eddy current loss and improving the response speed of the switch solenoid valve.

[0037] Depend on Figure 4 It can be seen that when the proportional solenoid valve excitation coil 5 is not energized, only the upper cone of the armature 7 is placed in the stepped hole of the proportional solenoid valve main magnetic pole; when the proportional solenoid valve excitation coil 5 is energized, the proportional solenoid valve main magnetic pole 42, the proportional solenoid valve auxiliary magnetic pole 6 and the armature 7 are magnetized, generating a main magnetic flux Φ 1 , main magnetic flux Φ 1Generate two partial magnetic flux Φ 2 and Φ 3 ; Magnetic flux Φ 2 The electromagnetic force F enters the main magnetic pole 42 of the proportional solenoid valve through the air gap between the end surface of the armature 7 and the stepped hole of the main magnetic pole 42 of the proportional solenoid valve, generating an axial electromagnetic force F acting on the end surface of the armature 7. 1 , divided magnetic flux Φ 3 The electromagnetic force F enters the main magnetic pole 42 of the proportional solenoid valve through the air gap between the upper cone of the armature 7 and the main magnetic pole 42 of the proportional solenoid valve, generating an electromagnetic force F acting on the upper cone surface of the armature 7. 2 , electromagnetic force F 2 The electromagnetic force F in the axial and radial directions is induced 2z and F 2r , at this time the axial electromagnetic force F 1 and the electromagnetic force F 2 Axial electromagnetic force F 2z Together they form the armature driving force. 3 In the circuit, the working air gap magnetic resistance between the upper cone of the armature 7 and the main magnetic pole 42 of the proportional solenoid valve gradually decreases, and the degree of decrease is greater than the magnetic flux Φ 2 The working air gap magnetic resistance between the end face of the armature 7 and the main magnetic pole 42 of the proportional solenoid valve in the circuit makes the magnetic flux Φ 2 Gradually decreases, magnetic flux Φ 3 gradually increases, resulting in F acting on the end face of armature 7 1 Reduce, the axial electromagnetic force F acting on the cone of the armature 7 2z Therefore, the output electromagnetic force obtained by the superposition of the two forces remains basically unchanged within a working stroke, thus producing a horizontal characteristic, which is also called a constant force characteristic.

[0038] Depend on Figure 5 It can be seen that as the lower cone of the armature 7 also enters the stepped hole of the main magnetic pole 42 of the proportional solenoid valve, the distance between the armature 7 and the proportional solenoid valve is further reduced, and the magnetic resistance of the working air gap between the end face of the armature 7 and the proportional solenoid valve is also significantly reduced, which also makes the magnetic flux Φ 2 Increase, so that the axial force F 1 Therefore, at the end of the working stroke, the output electromagnetic force increases, which eventually leads to the degradation of the overall constant force characteristics. However, due to the entry of the lower cone of the armature 7, the main magnetic flux Φ 1 Another magnetic flux Φ is generated 4 , divided magnetic flux Φ 4 The electromagnetic force F1 enters the main magnetic pole 42 of the proportional solenoid valve through the air gap between the lower conical surface of the armature 7 and the main magnetic pole 42 of the proportional solenoid valve, generating an electromagnetic force F2 acting on the lower conical surface of the armature 7. 3 , electromagnetic force F 3 Induced axial and radial electromagnetic forces F 3z and F 3r At this time, the axial electromagnetic force F1 , electromagnetic force F 2 Axial electromagnetic force F 2z and the electromagnetic force F 3 Axial electromagnetic force F 3z The three together constitute the armature driving force. 3 Axial electromagnetic force F 3z The three and the axial electromagnetic force F 1 , electromagnetic force F 2 Axial electromagnetic force F 2z The direction of action is opposite to that of the armature 7, so it can suppress the problem that the electromagnetic force caused by the increase in displacement of the armature 7 in the later stage increases rapidly and causes its constant force characteristics to decrease.

[0039] Depend on Figure 6 It can be seen that when the switch and the proportional solenoid valve work at the same time, the switch solenoid valve excitation coil 2 and the proportional solenoid valve excitation coil 5 are simultaneously fed with current, generating magnetic flux Φ and magnetic flux Φ 1 , in the magnetic flux Φ and Φ 1 Under the action of the electromagnetic force, the moving iron core 1 and the armature 7 start to move together along the axial direction of the return springs of the two under the action of the electromagnetic force.

[0040] Depend on Figure 7 It can be seen that the switch solenoid valve works alone. When the switch solenoid valve excitation coil 2 is supplied with current, the switch solenoid valve main magnetic pole 41, the switch solenoid valve secondary magnetic pole 3 and the moving iron core 1 are magnetized to generate a magnetic flux Φ. The magnetic flux Φ starts from the switch solenoid valve main magnetic pole and enters the air gap below the moving iron core 1, and then goes to the switch solenoid valve secondary magnetic pole 3 to form a closed loop. As the current in the switch solenoid valve excitation coil 2 increases, the electromagnetic force gradually increases. When the electromagnetic force is greater than the load force on the switch solenoid valve reset spring 8, the moving iron core 1 begins to move in the direction of the switch solenoid valve main magnetic pole 41, and finally completes the pull-in movement. When the switch solenoid valve excitation coil 8 is powered off, the electromagnetic force on the moving iron core 1 gradually decreases. Under the combined action of the external load force and the switch solenoid valve reset spring 8, the moving iron core 1 moves away from the switch solenoid valve main magnetic pole 41 to complete the release process.

[0041] When the proportional solenoid valve works alone, the proportional solenoid valve excitation coil 5 is energized while the switch solenoid valve excitation coil 2 is not energized; at this time, only the armature 7 moves axially along the proportional solenoid valve reset spring 9 under the action of electromagnetic force while the moving iron core is in a stationary state.

[0042] In summary, by designing the armature 7 into a three-section structure of an upper cone, a lower cone and a cylinder from top to bottom, opening a hole 10 and an annular groove 11 on the moving iron core 1 and opening a groove 12 on the main magnetic pole 41 of the switch solenoid valve, and integrating the switch and the proportional solenoid valve, the solenoid valve has multiple working modes, adapts to a wider range of application scenarios, and can improve its switch response speed and proportional control accuracy. The technical features disclosed in the invention are feasible and have significant innovation and effectiveness.

[0043] Finally, it should be noted that the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A switch and proportional combination solenoid valve, specifically comprising: A moving iron core (1), a switch solenoid valve excitation coil (2), a solenoid valve main magnetic pole (4), a switch solenoid valve auxiliary magnetic pole (3), a switch solenoid valve reset spring (8), a proportional solenoid valve excitation coil (5), a proportional solenoid valve auxiliary magnetic pole (6), an armature (7), and a proportional solenoid valve reset spring (9), characterized in that: The solenoid valve main magnetic pole (4) comprises a switch solenoid valve main magnetic pole (41) and a proportional solenoid valve main magnetic pole (42); The main magnetic pole (41) of the switch solenoid valve is in the shape of a hollow cylinder, and has four grooves symmetrically distributed along the circumferential direction at the end thereof; The main magnetic pole (42) of the proportional solenoid valve is cylindrical, with a stepped hole in the center, and the stepped hole is composed of a circular hole and a tapered hole; The auxiliary magnetic pole (3) of the switch solenoid valve is a circular ring structure; The auxiliary magnetic pole (6) of the proportional solenoid valve is a barrel-shaped structure with a round through hole at the bottom; The switch solenoid valve excitation coil (2) is placed between the switch solenoid valve auxiliary magnetic pole (3) and the switch solenoid valve main magnetic pole (41); The proportional solenoid valve excitation coil (5) is placed between the proportional solenoid valve auxiliary magnetic pole (6) and the proportional solenoid valve main magnetic pole (42); The armature (7) structure is composed of three sections, which are an upper cone, a lower cone and a cylinder from top to bottom; The moving iron core (1) is a disc-shaped structure, and has an annular groove on one side close to the main magnetic pole (41) of the switch solenoid valve and holes evenly spaced along the circumference; The switch solenoid valve return spring (8) is built into the switch solenoid valve main magnetic pole (41) to push the iron core (1) to move; The proportional solenoid valve reset spring (9) is built into the stepped hole of the proportional solenoid valve main magnetic pole (42) to push the armature (7) to move.

2. A switch and proportional combined solenoid valve according to claim 1, characterized in that: The diameter r of the annular groove of the moving iron core (1) is larger than the outer diameter R1 of the main magnetic pole (41) of the switch electromagnetic valve, but smaller than the inner diameter R2 of the auxiliary magnetic pole (3) of the switch electromagnetic valve.

3. A switch and proportional combined solenoid valve according to claim 1, characterized in that: When the proportional solenoid valve excitation coil (5) is not energized, only the upper cone of the armature (7) is placed in the stepped hole of the proportional solenoid valve main magnetic pole (42); when the proportional solenoid valve excitation coil (5) is not energized, the proportional solenoid valve main magnetic pole (42), the proportional solenoid valve auxiliary magnetic pole (6) and the armature (7) are magnetized to generate a main magnetic flux Φ1, and the main magnetic flux Φ1 generates two partial magnetic fluxes Φ2 and Φ3; the partial magnetic flux Φ2 enters the proportional solenoid valve main magnetic pole (42) through the air gap between the end face of the armature (7) and the stepped hole of the proportional solenoid valve main magnetic pole (42), generating an axial electromagnetic force F1 acting on the end face of the armature (7); the partial magnetic flux Φ3 enters the proportional solenoid valve main magnetic pole (42) through the air gap between the upper cone of the armature (7) and the proportional solenoid valve main magnetic pole (42), generating an electromagnetic force F2 acting on the upper cone of the armature (7), and the electromagnetic force F2 induces axial and radial electromagnetic component forces F 2z and F 2r At this time, the axial electromagnetic force F1 and the electromagnetic force F2 are axial electromagnetic components F 2z Together they constitute the armature driving force; as the displacement of the armature (7) increases, the lower cone of the armature (7) also enters the stepped hole of the main magnetic pole (42) of the proportional solenoid valve, at which time the main magnetic flux Φ1 also generates a partial magnetic flux Φ4, which enters the main magnetic pole (42) of the proportional solenoid valve through the air gap between the lower cone of the armature (7) and the main magnetic pole (42) of the proportional solenoid valve, generating an electromagnetic force F3 acting on the lower cone of the armature (7), and the electromagnetic force F3 induces axial and radial electromagnetic component forces F 3z and F 3r At this time, the axial electromagnetic force F1, electromagnetic force F2 and axial electromagnetic force F 2z and electromagnetic force F3 axial electromagnetic force F 3z The three together constitute the armature driving force; electromagnetic force F3 axial electromagnetic force F 3z The three and the axial electromagnetic force F1, electromagnetic force F2 and axial electromagnetic component force F 2z The action direction is opposite to that of the armature (7), so as to suppress the rapid increase of the electromagnetic force when the displacement of the armature (7) increases in the later stage.

4. A switch and proportional combined solenoid valve according to claim 1, characterized in that: When the switch and the proportional solenoid valve work simultaneously, the switch solenoid valve excitation coil (2) and the proportional solenoid valve excitation coil (5) are energized simultaneously, and the moving iron core (1) and the armature (7) simultaneously move axially along the return springs of the two under the action of electromagnetic force; When the switch solenoid valve works alone, the switch solenoid valve excitation coil (2) is energized while the proportional solenoid valve excitation coil (5) is not energized, and only the moving iron core (1) moves axially along the switch solenoid valve return spring (8) under the action of the electromagnetic force while the armature (7) is in a stationary state; When the proportional solenoid valve works alone, the proportional solenoid valve excitation coil (5) is energized while the switch solenoid valve excitation coil (2) is not energized, and only the armature (7) moves axially along the proportional solenoid valve return spring (9) under the action of electromagnetic force while the moving iron core is in a stationary state.

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