Electromagnetic valve and four-way reversing valve

Abstract

The electromagnetic valve comprises a pilot valve body and an electromagnetic coil, the pilot valve body comprises a pilot valve sleeve, the electromagnetic coil is provided with a coil inner hole, and the electromagnetic coil is arranged outside the pilot valve sleeve in a sleeving mode; along the axis direction of the pilot valve sleeve, the length of the electromagnetic coil is H, the length of the pilot valve sleeve is H ', and H / H' = 0.9-1.0. By adjusting a reel structure in the prior art, the height of the electromagnetic coil is increased, the matching length of the electromagnetic coil and the valve body is increased, the electromagnetic force of a product is increased, the action performance of the coil is improved, and heat dissipation of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, and more specifically, to a solenoid valve and also to a four-way reversing valve with the solenoid valve. Background Art

[0002] The most basic performance indicators of electromagnetic coils are the minimum operating voltage and temperature rise. The lower the minimum operating voltage, the more reliable the electromagnetic coil's performance is, and the electromagnetic coil can work within a larger voltage fluctuation range; the lower the temperature rise, the better the heat dissipation of the electromagnetic coil, which is conducive to extending the service life of key components such as winding frames, encapsulation and enameled wires, and the low temperature rise can in turn improve the reliability of the action. The current performance indicators of electromagnetic coils need to be improved, which also limits the performance indicators of solenoid valves to a certain extent.

[0003] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0004] The utility model aims to solve the above problems and provide a solenoid valve to improve the coil action performance of the solenoid valve.

[0005] The above technical purpose of the utility model is achieved through the following technical scheme: a solenoid valve, including a pilot valve body and a solenoid coil, the pilot valve body includes a pilot valve sleeve, the solenoid coil has a coil inner hole, and the solenoid coil is sleeved outside the pilot valve sleeve; along the axial direction of the pilot valve sleeve, the length of the solenoid coil is H, the length of the pilot valve sleeve is H', H / H'=0.9~1.0.

[0006] This embodiment also provides a four-way reversing valve, including a main valve body and the above-mentioned solenoid valve, the outer surface of the solenoid coil being close to the main valve body as the approach side, the distance between the approach side and the axis of the pilot valve sleeve is C, the distance between the axis of the pilot valve sleeve and the surface of the main valve body is C', C / C'=0.785~1.

[0007] This solution increases the height of the electromagnetic coil, increases the matching length of the electromagnetic coil and the valve body, increases the electromagnetic force of the product, improves the coil action performance, and increases the heat dissipation of the product by adjusting the winding frame structure of the existing technology.

[0008] This solution reduces the valve body diameter and adjusts the clearance between the coil and the inner hole of the valve body to reduce magnetic circuit loss, increase heat conduction, enhance electromagnetic force, and increase heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the structure of the solenoid valve in this embodiment;

[0010] Figure 2is an exploded view of the solenoid valve in this embodiment;

[0011] Figure 3 Schematic diagram of the structure of the electromagnetic coil in this embodiment;

[0012] Figure 4 : is an exploded view of the four-way reversing valve in this embodiment;

[0013] Figure 5 is a cross-sectional view of the winding frame in this embodiment;

[0014] Figure 6 is a cross-sectional view of the bobbin and the coil winding in this embodiment;

[0015] Figure 7 is a cross-sectional view of the solenoid valve in this embodiment;

[0016] Figure 8 This is a schematic diagram of the structure of the magnetic conductor before being bent in this embodiment;

[0017] Fig. 9 This is a schematic diagram of the structure of the magnetic conductor after bending in this embodiment;

[0018] Fig.10 for Figure 7 A partial enlarged view of the

[0019] Fig.11 for Fig.10 Enlarged view of point A in the middle;

[0020] Fig.12 This is a schematic diagram of the structure of the sleeve end in this embodiment;

[0021] Fig.13 The structure of the four-way reversing valve in this embodiment is shown in FIG. Figure 1 ;

[0022] Fig.14 The structure of the four-way reversing valve in this embodiment is shown in FIG. Figure 2 .

[0023] Figure numerals: 1. main valve body; 2. solenoid valve; 3. pilot valve body; 31. pilot valve sleeve; 311. sleeve end; 32. electromagnetic armature; 33. stop seat; 331. boss; 332. threaded hole; 34. screw; 35. sliding bowl; 36. spring; 4. electromagnetic coil; 401. coil inner hole; 41. winding frame; 411. first through hole; 42. coil winding; 43. insulating coating; 44. magnetic conductor; 441. first magnetic conductive part; 442. second through hole; 443. second magnetic conductive part; 444. screw through hole; 402. approach side. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figure 1-3 The present embodiment discloses a solenoid valve, comprising a pilot valve body 3 and a solenoid coil 4. The pilot valve body 3 comprises a pilot valve sleeve 31, which is a round tube connected to the pilot valve body 3. The pilot valve sleeve 31 has components such as an electromagnetic armature 32, a spring 36 and a stop seat 33; the electromagnetic coil 4 has a coil inner hole 401, through which the electromagnetic coil 4 is sleeved outside the pilot valve sleeve 31, and the pilot valve sleeve 31 and other components serve as an iron core component. When the electromagnetic coil 4 is energized, a magnetic circuit is generated in the pilot valve sleeve 31, and the electromagnetic armature 32 is driven by magnetism to move, thereby realizing control.

[0026] Reference Figure 4 , this embodiment defines the size relationship between the electromagnetic coil 4 and the pilot valve sleeve 31. Along the axial direction of the pilot valve sleeve 31, the length of the electromagnetic coil 4 is H, the length of the pilot valve sleeve 31 is H', and H / H'=0.9-1.0. By increasing the length of the electromagnetic coil 4, the length of the electromagnetic coil 4 is close to the length of the pilot valve sleeve 31, the height of the electromagnetic coil 4 can be increased, the matching length of the electromagnetic coil 4 and the pilot valve body 3 can be increased, the electromagnetic force of the product can be increased, and the coil action performance can be improved.

[0027] Reference Figure 5 , 6 For the electromagnetic coil 4, the most basic performance indicators are the minimum operating voltage and temperature rise, and the decisive factors of the minimum operating voltage and temperature rise performance are the ampere-turn force and current of the coil design.

[0028]

[0029] Therefore, when the design voltage is consistent, the ampere-turn force is inversely proportional to the resistance and directly proportional to the number of turns.

[0030]

[0031] Inductive reactance R L =2π×frequency f×inductance L

[0032]

[0033] Inductance L = N 2 ×Correction coefficient K

[0034]

[0035] Wherein: the inner diameter of the winding wire D1 = the diameter of the winding shaft designed for the winding frame 41, and the coil winding height h = the height of the wire arrangement groove of the winding frame 41.

[0036] In the entire electromagnetic coil 4, increasing the length H of the electromagnetic coil 4 will increase the axial length of the winding frame 41, and the coil height h of the coil winding 42 will also increase. The electromagnetic coil 4 will be distributed in a space with a longer axial length. When the same number of coil turns is wound, the winding length of the electromagnetic coil 4 will be reduced, and the winding mass m of the electromagnetic coil 4 will also be reduced. This embodiment defines the relationship between the coil ampere-turn force F and the winding mass m, m / F=0.059~0.147, optimizes the coil ampere-turn force, and improves the coil action performance.

[0037] Reference Figure 3 , 7 In this embodiment, the electromagnetic coil 4 includes a bobbin 41, a coil winding 42, an insulating coating 43 and a magnetic conductor 44. The bobbin 41 is injection-molded with an insulating resin material. The general structure of the bobbin 41 is cylindrical. The bobbin 41 has a first through hole 411 in the middle. The first through hole 411 forms a partial coil inner hole 401 of the electromagnetic coil 4, that is, the bobbin 41 is sleeved outside the guide valve sleeve 31. A retaining ring is integrally formed at the outer peripheral position of both ends of the bobbin 41, and a ring-shaped wire arrangement groove is formed between the two retaining rings. The coil winding 42 is mainly enameled wire, which is continuously wound in the wire arrangement groove of the bobbin 41 to form the coil winding 42 around the bobbin 41. The shape and size parameters of the coil winding 42 are mainly determined by the shape of the wire arrangement groove. The insulating coating 43 is injection molded from an insulating resin material, and the coil winding 42 and the winding frame 41 can be covered by the insulating coating 43 to be insulated; the coil winding 42 has a connecting piece, which is exposed from the insulating coating 43 and connected to a power source through a lead wire, so that the coil winding 42 can be energized. The magnetic conductor 44 is generally annular in structure and is installed outside the insulating coating 43. After the coil winding 42 is energized and magnetized, a magnetic flux loop is formed by the magnetic conductor 44.

[0038] Reference Figure 8 , 9In this embodiment, the magnet 44 is formed by bending a metal sheet, and the two ends of the sheet are brought close to each other by bending to form a roughly quadrilateral ring structure. The magnet 44 has four sides, wherein two sides are the first magnetic conductive part 441 and the second magnetic conductive part 443. The first magnetic conductive part 441 and the second magnetic conductive part 443 are respectively located at the two ends of the electromagnetic coil 4. Along the axial direction of the pilot valve sleeve 31, the first magnetic conductive part 441 and the second magnetic conductive part 443 are perpendicular to the axis of the pilot valve sleeve 31. The first magnetic conductive part 441 is located on the side of the magnet 44 close to the pilot valve body 3, and the second magnetic conductive part 443 is located on the side of the magnet 44 away from the pilot valve body 3. During assembly, the first magnetic conductive part 441 and the second magnetic conductive part 443 can fit with the two end surfaces of the electromagnetic coil 4.

[0039] A second through hole 442 is provided at approximately the middle position of the first magnetic conductive part 441, and the pilot valve sleeve 31 is provided through the second through hole 442, and the second through hole 442 forms part of the inner hole 401 of the coil. During the bending process of the sheet of the magnetic conductive body 44, the first magnetic conductive part 441 is formed by splicing the two ends of the sheet, and then the second through hole 442 can be composed of two semicircular notches, thereby forming the second through hole 442 of the magnetic conductive part. A screw through hole 444 is provided at approximately the middle position of the second magnetic conductive part 443, and the screw through hole 444 can be fixed to the pilot valve sleeve 31 by means of screws 34.

[0040] Reference Figure 7 , 10 , 11, one end of the pilot valve sleeve 31 is connected to the pilot valve body 3, and the other end is a sleeve end 311 away from the pilot valve body 3. The pilot valve sleeve 31 is installed with components such as a sliding bowl 35, an electromagnetic armature 32, and a spring 36. A stopper 33 is installed at the position of the sleeve end 311, and the sleeve end 311 is blocked by the stopper 33 to limit the components in the pilot valve sleeve 31. The components in the pilot valve sleeve 31 can achieve sliding action after the electromagnetic coil 4 is energized, thereby realizing the control of the electromagnetic valve 2.

[0041] In this embodiment, the stopper 33 is matched with the inner hole clearance of the pilot valve sleeve 31, the stopper 33 extends into the pilot valve sleeve 31, and the end surface of the stopper 33 is substantially flush with the end surface of the sleeve end 311. Laser welding is used between the stopper 33 and the pilot valve sleeve 31, so that the stopper 33 can be connected and fixed with the pilot valve sleeve 31 to form a whole. After laser welding, at the sleeve end 311.

[0042] The inner hole 401 of the electromagnetic coil 4 is in clearance with the pilot valve sleeve 31, and the inner hole 401 of the electromagnetic coil 4 is in tighter fit with the pilot valve sleeve 31. The diameter of the electromagnetic armature 32 is in clearance with the inner circumference of the pilot valve sleeve 31, and the electromagnetic armature 32 can slide axially in the pilot valve sleeve 31. In this embodiment, the relationship between the diameter D' of the electromagnetic armature 32 and the diameter D1 of the inner hole 401 of the coil is defined, D' / D1≥0.87, which can reduce the magnetic circuit air gap between the inner hole of the electromagnetic coil 4 and the pilot valve, reduce the loss of electromagnetic force, and improve the electromagnetic drive efficiency.

[0043] Reference Fig.11 , 12 In this embodiment, the end surface of the stopper 33 has a boss 331, which protrudes from the sleeve end 311 along the axial direction of the pilot valve sleeve 31, and has a step surface. An annular space is formed at the outer peripheral position of the boss 331 to accommodate deformation and size changes during laser welding.

[0044] During the installation of the electromagnetic coil 4 and the pilot valve sleeve 31, the boss 331 abuts against the second magnetic conductive part 443, and a gap is formed between the stop seat 33 at the outer peripheral position of the boss 331 and the second magnetic conductive part 443. The stop seat 33 and the second magnetic conductive part 443 are connected and fixed by a screw 34. The second magnetic conductive part 443 has a screw through hole 444, and the stop seat 33 has a threaded hole 332, and the threaded hole 332 is located at a substantially middle position of the boss 331. The screw 34 passes through the screw through hole 444 and is threadedly connected to the threaded hole 332, so that the second magnetic conductive part 443 is abutted and fixed on the stop seat 33. The abutting position of the boss 331 and the second magnetic conductive part 443 is specifically in a ring shape around the screw 34.

[0045] Reference Figure 8 , 12 In this embodiment, the relationship between the abutment area S1 of the boss 331 and the area S2 of the second magnetic conductive portion 443 is limited, S1 / S2≥0.036, which can increase the relative area of ​​the boss 331 and reduce the space of the step on the periphery of the boss 331. The magnetic circuit area between the second magnetic conductive portion 443 and the valve body stop seat 33 will increase, the electromagnetic loss will be reduced, the electromagnetic force will be enhanced, and the electromagnetic drive efficiency will be improved.

[0046] Reference Figure 13-14 This embodiment also discloses a four-way reversing valve, including a main valve body 1 and a solenoid valve 2 as in the above embodiment, and the main valve body 1 is controlled by the solenoid valve 2.

[0047] The outer surface of the electromagnetic coil 4 is the proximity side 402, which is the position of the electromagnetic coil 4 closest to the main valve body 1. According to the installation direction of the electromagnetic coil 4 and the wiring position of the electromagnetic coil 4, the proximity side 402 can be the side position of the magnetizer 44, or can also be the part of the insulating coating 43 that exposes the magnetizer 44.

[0048] The distance between the approach side 402 of the electromagnetic coil 4 and the axis of the pilot valve sleeve 31 is C, and the distance between the axis of the pilot valve sleeve 31 and the surface of the main valve body 1 is C'. This embodiment defines the relationship between C and C', C / C'=0.785-1. As the coil height increases, the ampere-turn force will increase, the coil winding thickness b decreases, the coil outer diameter decreases, and the overall peripheral size of the electromagnetic coil 4 will also decrease. In the four-way reversing valve, the same installation space can be used to install the electromagnetic coil 4 with better performance indicators, thereby improving the performance of the four-way reversing valve.

[0049] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: The invention comprises a pilot valve body (3) and an electromagnetic coil (4), wherein the pilot valve body (3) comprises a pilot valve sleeve (31), the electromagnetic coil (4) has a coil inner hole (401), and the electromagnetic coil (4) is sleeved outside the pilot valve sleeve (31); along the axial direction of the pilot valve sleeve (31), the length of the electromagnetic coil (4) is H, the length of the pilot valve sleeve (31) is H', and H / H'=0.9~1.

0.

2. The solenoid valve according to claim 1, characterized in that: The electromagnetic coil (4) comprises a winding frame (41), a coil winding (42), an insulating coating (43) and a magnetic conductor (44); the winding frame (41) has a first through hole (411), the first through hole (411) forms a part of the inner hole (401) of the coil; the winding frame (41) is sleeved outside the guide valve sleeve (31); the coil winding (42) is wound around the winding frame (41); the insulating coating (43) insulates and covers the coil winding (42); and the magnetic conductor (44) is arranged outside the insulating coating (43); The magnet (44) comprises a first magnet portion (441) and a second magnet portion (443). Along the axial direction of the pilot valve sleeve (31), the first magnet portion (441) is located on a side of the magnet (44) close to the pilot valve body (3), and the second magnet portion (443) is located on a side of the magnet (44) away from the pilot valve body (3).

3. The solenoid valve according to claim 2, characterized in that: The first magnetic conductive portion (441) comprises a second through hole (442), the pilot valve sleeve (31) is passed through the second through hole (442), and the second through hole (442) forms a portion of the coil inner hole (401).

4. The solenoid valve according to any one of claims 1 to 3, characterized in that: The pilot valve body (3) further comprises an electromagnetic armature (32), the electromagnetic armature (32) being arranged in the pilot valve sleeve (31), and the electromagnetic armature (32) being able to slide axially along the pilot valve tube; the diameter of the electromagnetic armature (32) is D', the diameter of the coil inner hole (401) is D1, and D' / D1≥0.

87.

5. The solenoid valve according to claim 2, characterized in that: The pilot valve sleeve (31) has a sleeve end (311) away from the pilot valve body (3); the pilot valve body (3) also includes a stop seat (33), the stop seat (33) is fixed to the sleeve end (311) and blocks the sleeve end (311); the stop seat (33) includes a boss (331), the boss (331) protrudes from the sleeve end (311) along the axial direction of the pilot valve sleeve (31), and the boss (331) abuts against the second magnetic conductive portion (443).

6. The solenoid valve according to claim 5, characterized in that: The stop seat (33) and the second magnetic conductive part (443) are connected and fixed by means of a screw (34); the second magnetic conductive part (443) comprises a screw through hole (444); the stop seat (33) comprises a threaded hole (332); the screw (34) passes through the screw through hole (444) and is threadedly connected to the threaded hole (332); the threaded hole (332) is located on the boss (331); the abutment position between the boss (331) and the second magnetic conductive part (443) is in a ring shape surrounding the screw (34).

7. The solenoid valve according to claim 5 or 6, characterized in that: The area of ​​the boss (331) is S1, the area of ​​the second magnetic conductive portion (443) is S2, and S1 / S2≥0.

036.

8. A four-way reversing valve, characterized in that: It comprises a main valve body (1) and a solenoid valve (2) as claimed in claim 1 or 2, wherein the side of the outer surface of the solenoid coil (4) close to the main valve body (1) is a proximity side (402), the distance between the proximity side (402) and the axis of the pilot valve sleeve (31) is C, the distance between the axis of the pilot valve sleeve (31) and the surface of the main valve body (1) is C', and C / C'=0.785~1.

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