Coil assembly of electric valve and electric valve

Abstract

The application relates to the technical field of fluid control, in particular to a coil assembly of an electric valve and the electric valve. The coil assembly comprises a coil provided with a pin, a control box provided with a containing chamber for containing a circuit board assembly, a through hole in communication with the containing chamber is arranged on the control box, the pin is arranged in the through hole and extends into the containing chamber, and the control box further comprises a sealing piece arranged between the through hole and the pin to seal the gap between the pin and the hole wall of the through hole. The coil assembly can effectively reduce the probability of water vapor, impurities and the like entering the control box, and prolong the service life of the circuit board assembly.

Description

Technical Field

[0001] This application relates to the field of fluid control, and more specifically, to a coil assembly and an electric valve for an electric valve. Background Technology

[0002] Electric valves, as a type of flow control device, have the advantages of high adjustment accuracy and fast response speed. An electric valve generally consists of a coil assembly and a valve body assembly. During operation, a pulse signal is applied to the coil assembly to drive the valve core of the valve body assembly, thereby adjusting the opening and closing degree of the valve orifice and controlling the fluid flow rate.

[0003] In related technologies, a coil assembly typically includes a coil and a control box connected to the coil. The control box houses a circuit board assembly. The coil's pins can pass through the control box and connect to the circuit board assembly, allowing the circuit board assembly to adjust the coil's pulse signal, thereby regulating the opening and closing degree of the valve core and valve port.

[0004] However, gaps can easily form at the connection between the coil and the control box, allowing moisture from the external environment to easily enter the control box along the pins, affecting the dryness and cleanliness of the control box and consequently impacting the lifespan of the circuit board assembly. Utility Model Content

[0005] A primary objective of this application is to overcome at least one of the deficiencies of the prior art and provide a coil assembly for an electric valve. This coil assembly can effectively reduce the probability of moisture, impurities, etc., entering the control box, thereby extending the service life of the circuit board assembly.

[0006] Another major objective of this application is to overcome at least one of the defects of the prior art described above and to provide an electric valve that has the advantage of long service life because it includes a coil assembly.

[0007] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0008] According to one aspect of this application, a coil assembly for an electric valve includes: a coil including a pin; a control box including a receiving chamber for receiving a circuit board assembly; the control box having a through hole communicating with the receiving chamber, the pin passing through the through hole and extending into the receiving chamber; wherein the control box further includes a seal disposed between the through hole and the pin to seal the gap between the pin and the wall of the through hole.

[0009] According to some embodiments of this application, the through hole includes a pin hole and a receiving groove, the pin hole communicating with the receiving chamber through the receiving groove; the pin passes through the pin hole and the receiving groove and extends into the receiving chamber;

[0010] The seal is disposed within the receiving groove to seal the gap between the pin and the groove wall.

[0011] According to some embodiments of this application, the sealant includes a potting compound that fills the space between the pin and the wall of the receiving groove.

[0012] According to some embodiments of this application, the seal includes an elastic seal that is sealingly connected between the outer wall of the pin and the wall of the receiving groove.

[0013] According to some embodiments of this application, the control box further includes a circuit board assembly disposed in the receiving chamber;

[0014] The circuit board assembly is provided with a through hole, and the pin passes through the through hole;

[0015] The circuit board assembly and the seal have a receiving gap for accommodating welding material.

[0016] According to some embodiments of this application, the dimension of the receiving gap in the extension direction of the pin hole is greater than or equal to 0.5 mm.

[0017] According to some embodiments of this application, the control box includes a first box wall and a connecting portion disposed on the first box wall;

[0018] The first box wall has a first surface facing the receiving chamber, the connecting portion has a second surface facing the receiving chamber, the second surface protrudes from the first surface, and the receiving groove is formed on the second surface.

[0019] According to some embodiments of this application, the control box includes a first box wall and a connecting portion disposed on the first box wall; the first box wall has a first surface facing the receiving chamber, the connecting portion has a second surface facing the receiving chamber, the second surface protrudes from the first surface, and the receiving groove is formed on the second surface; the circuit board assembly abuts against the second surface.

[0020] According to some embodiments of this application, an overflow groove is further provided on the second surface, and the overflow groove is in communication with the receiving groove.

[0021] According to some embodiments of this application, the overflow trough has a first bottom wall, and the distance between the first bottom wall of the overflow trough and the second surface is greater than or equal to 0.5 mm.

[0022] According to some embodiments of this application, the pin holes include a plurality of pin holes, which are connected to the receiving groove, and the overflow groove is configured to be at least one.

[0023] According to some embodiments of this application, the pin hole includes a plurality of pin holes, the receiving groove includes a plurality of receiving grooves, and the plurality of receiving grooves are configured in one-to-one correspondence with the plurality of pin holes;

[0024] The overflow channel includes multiple overflow channels, and each overflow channel is configured in a one-to-one correspondence with a multiple receiving channel.

[0025] According to some embodiments of this application, the cross-sectional area of ​​the receiving groove is S1 in the cross-section perpendicular to the extension direction of the pin hole; the cross-sectional area of ​​the pin hole is S2 in the cross-section perpendicular to the extension direction of the pin hole, and S1 and S2 satisfy: 2≤S1:S2≤20.

[0026] And / or, the dimension of the receiving groove in the extension direction of the pin hole is between 2mm and 20mm.

[0027] According to some embodiments of this application, a waterproof structure is provided between the coil and the control box. The waterproof structure is disposed on the outer periphery of the through hole and includes a waterproof part disposed on the control box and a waterproof mating part disposed on the coil.

[0028] The waterproof part is connected to the waterproof mating part to increase the connection area between the coil and the control box.

[0029] According to some embodiments of this application, the control box includes a first box wall and a connecting portion disposed on the first box wall; the first box wall has a first surface facing the receiving chamber and a third surface facing the coil;

[0030] The waterproof part includes an annular boss protruding from the third surface;

[0031] And / or,

[0032] The waterproof portion includes an annular groove recessed into the third surface.

[0033] According to some embodiments of this application, a fixing structure is further provided between the coil and the control box. The fixing structure is disposed on the outer periphery of the waterproof structure. The fixing structure includes a fixing mating part disposed on the control box and a fixing mating part disposed on the coil. The fixing part is connected to the fixing mating part.

[0034] According to some embodiments of this application, the control box includes a first box wall and a connecting portion disposed on the first box wall; the first box wall has a first surface facing the receiving chamber and a third surface facing the coil;

[0035] The fixing part includes a fixing groove recessed into the first surface;

[0036] And / or, the fixing part includes a fixing protrusion protruding from the first surface.

[0037] According to another aspect of this application, an electric valve includes:

[0038] Valve body assembly;

[0039] A coil assembly for adjusting the flow rate of the valve body assembly, wherein the coil assembly is the aforementioned coil assembly.

[0040] An embodiment of the above application has at least the following advantages or beneficial effects:

[0041] The coil assembly of the electric valve in this application includes a coil and a control box. A pin is provided on the coil, and the pin can be inserted into the receiving chamber through a through hole on the control box. A seal is provided at the gap between the through hole and the pin. The seal effectively seals the gap between the outer wall of the pin and the wall of the through hole, thereby reducing the probability of moisture entering the receiving chamber, ensuring the dryness of the receiving chamber, and helping to extend the service life of the circuit board assembly inside the receiving chamber. Attached Figure Description

[0042] The various objectives, features, and advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of this application and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts.

[0043] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the coil assembly of an electric valve;

[0044] Figure 2 yes Figure 1 A top view of the coil assembly;

[0045] Figure 3 yes Figure 2 A cross-sectional view along plane AA, wherein, Figure 3 The structure of the seal is mainly shown;

[0046] Figure 4 yes Figure 3 Enlarged structural diagram at point B;

[0047] Figure 5 yes Figure 1 A three-dimensional structural diagram of a portion of the coil assembly;

[0048] Figure 6 yes Figure 5 A side view of a portion of the structure of the coil assembly;

[0049] Figure 7 yes Figure 2 A cross-sectional view along plane AA, wherein, Figure 7 The main illustration shows the structure at the connection between the coil and the control box;

[0050] Figure 8 It shows Figure 7 A magnified structural diagram at point C.

[0051] The annotations in the attached figures are explained as follows:

[0052] 10. Coil assembly;

[0053] 100. Coil; 110. Stator assembly; 120. Housing; 130. Pin;

[0054] 200, Control box; 201, Receiving chamber; 202, Receiving gap; 210, First housing; 211, First box wall; 2111, First surface; 2112, Third surface; 212, Connecting part; 2121, Second surface; 213, Pin hole; 214, Receiving groove; 2141, Bottom wall of the second groove; 215, Overflow groove; 2151, Bottom wall of the first groove; 216, Baffle; 220, Second housing; 230, Seal; 231, Fourth surface; 240, Circuit board assembly; 241, Through hole;

[0055] 121. Fixed mating part; 122. Waterproof mating part;

[0056] 217. Fixing part; 2171. Fixing groove; 218. Waterproof part; 2181. Annular groove; 2191. First welded rib; 2192. Second welded rib;

[0057] L, the centerline of the stator assembly;

[0058] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0059] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0060] The features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0061] In related technologies, the coil assembly of an electric valve is prone to vibration during use, which can cause the connection between the coil and the control box to loosen. Moisture and impurities can easily enter the control box through the connection gap, affecting the service life of the circuit board assembly inside the control box.

[0062] In view of this, this application adds a seal inside the control box of the coil assembly. The seal can fill the gap between the pin and the control box to achieve a waterproof effect.

[0063] The following describes an embodiment of the coil assembly of this application with reference to the accompanying drawings. For ease of explanation, the extending direction of the pin hole on the control box is defined as the first direction D1, and the extending direction of the center line L of the stator assembly in the coil is defined as the second direction D2. The first direction D1 is perpendicular to the second direction D2. The direction perpendicular to both the first direction D1 and the second direction D2 is defined as the third direction D3.

[0064] like Figure 1 As shown, an embodiment of the coil assembly of the electric valve of this application includes: a coil 100 and a control box 200.

[0065] Specifically, such as Figure 2 As shown, the control box 200 includes a first housing 210 and a second housing 220. The second housing 220 covers the first housing 210 to form a receiving chamber 201. Figure 3 (As shown). Exemplarily, the receiving chamber 201 can be a sealed chamber or a waterproof and breathable chamber.

[0066] like Figure 3As shown, the coil 100 includes a stator assembly 110 and a housing 120. The stator assembly 110 includes a pin 130. The housing 120 is wrapped around the outside of the stator assembly 110. Meanwhile, the pin 130 can pass through the housing 120 and extend into the control box 200.

[0067] The control box 200 has a through hole that communicates with the receiving chamber 201. A pin 130 passes through the through hole and extends into the receiving chamber 201. The control box 200 also includes a seal 230, which is disposed between the through hole and the pin 130 to seal the gap between the pin 130 and the wall of the through hole. The seal 230 effectively blocks moisture from entering the receiving chamber 201, ensuring dryness within the chamber and thus guaranteeing the service life of the circuit board assembly 240.

[0068] Specifically, such as Figure 3 As shown, the through hole includes a pin hole 213 and a receiving groove 214, which can be disposed on the first housing 210. The pin hole 213 communicates with the receiving chamber 201 through the receiving groove 214. The pin 130 can pass through the pin hole 213 and the receiving groove 214 in sequence and extend into the receiving chamber 201. The pin 130 can be tightly fitted into the pin hole 213 so that the pin 130 can be stably fitted into the control box 200. The receiving groove 214 is used to accommodate the seal 230. The seal 230 can effectively seal the gap between the outer wall of the pin 130 and the groove wall of the receiving groove 214, blocking the path of moisture entering the receiving chamber 201, ensuring the dryness inside the receiving chamber 201, and thus ensuring the service life of the circuit board assembly 240.

[0069] It should be noted that, as Figure 3 As shown, the size of the pin hole 213 can be set with reference to the size of the pin 130 so that the pin 130 can be tightly inserted into the pin hole 213. For example, the outer wall of the pin 130 can be interference-fitted with the wall of the pin hole 213.

[0070] In embodiments of this application, the seal 230 may include a potting compound that fills the space between the pin 130 and the wall of the receiving groove 214.

[0071] Specifically, the potting compound can be produced by injecting sealant into the receiving tank 214, and the sealant can form a potting compound after air drying. Because the sealant has fluidity, it can tightly fill the gap between the pin 130 and the tank wall of the receiving tank 214, ensuring the barrier effect against water vapor.

[0072] In addition, the sealant has good adhesion. After the sealant forms a potting compound, it improves the connection stability between the pin 130 and the control box 200.

[0073] In other embodiments, the seal 230 may also include an elastic seal that is sealed between the outer wall of the pin 130 and the groove wall of the receiving groove 214.

[0074] Specifically, the elastic seal is provided with a receiving hole, the wall of the receiving hole is interference-fitted with the outer wall of the pin 130, and the outer wall of the elastic seal is interference-fitted with the groove wall of the receiving groove 214 to ensure the barrier effect against water vapor.

[0075] In the embodiments of this application, such as Figure 4 As shown, the control box 200 also includes a circuit board assembly 240 disposed in the receiving chamber 201. The circuit board assembly 240 is provided with a through hole 241, and the pin 130 passes through the through hole 241. There is a receiving gap 202 between the circuit board assembly 240 and the seal 230.

[0076] In some embodiments, the circuit board assembly and the pin 130 can be connected by soldering. Specifically, the pin 130 passes through the through-hole 241 and exits the circuit board assembly 240. During soldering, soldering material can be placed on the portion of the pin 130 that exits the circuit board assembly 240. After heating, the soldering material changes its properties, becoming a flowable molten state. The molten soldering material can flow along the pin 130 into the through-hole 241 and into the receiving gap 202. That is, the molten solder flows from one side of the circuit board assembly to the other side, so that soldering material is distributed inside the through-hole 241 and on both sides of the circuit board assembly 240, increasing the connection area between the circuit board assembly 240 and the pin 130, thereby improving the connection strength between the circuit board assembly 240 and the pin 130. Conversely, if the receiving gap 202 is not present, the seal 230 is easily adhered to the circuit board assembly 240, and the soldering material will not be able to flow to the other side of the circuit board assembly 240, affecting the connection strength between the pin 130 and the circuit board assembly 240. Of course, in other embodiments, the through hole 241 can also be a socket, with the hole wall of the through hole 241 having an interference fit with the pin 130 so that the pin 130 can be detachably connected to the circuit board assembly 240.

[0077] It can effectively improve the soldering tightness between the pin 130 and the circuit board assembly 240.

[0078] It should be noted that the soldering material can be tin-lead solder wire, lead-free solder wire, etc., and this embodiment does not limit it.

[0079] In the embodiments of this application, such as Figure 3As shown, the dimension H1 of the accommodating gap 202 in the first direction D1 extending from the pin hole 213 is greater than or equal to 0.5 mm. This distance helps to ensure the penetration of solder and the amount of molten solder contained in the accommodating gap 202, thereby helping to improve the soldering effect between the pin 130 and the circuit board assembly 240.

[0080] Furthermore, the value of H1 can be between 0.5mm and 5mm. Even further, the value of H1 can be between 0.5mm and 2mm.

[0081] For example, the value of H1 can be 0.5mm, 0.6mm, 1mm, 2mm, 3mm, 5mm or any value between any two of the above.

[0082] In the embodiments of this application, such as Figure 4 As shown, the control box 200 includes a first box wall 211 and a connecting portion 212 disposed on the first box wall 211. The first box wall 211 has a first surface 2111 facing the receiving chamber 201, and the connecting portion 212 has a second surface 2121 facing the receiving chamber 201, the second surface 2121 protruding from the first surface 2111. That is, the dimension of the connecting portion 212 in the first direction D1 is larger than the dimension of the first box wall 211 in the first direction D1. This allows the connecting portion 212 to provide a sufficiently long extension space for the pin hole 213 and the receiving groove 214, so as to increase the contact area between the pin hole 213 and the pin 130. At the same time, it also facilitates increasing the sealing area of ​​the seal 230.

[0083] A receiving groove 214 is formed on the second surface 2121. The circuit board assembly 240 is disposed within the control box 200 and can abut against the second surface 2121 of the connecting part 212. The second surface 2121 can be a plane perpendicular to the first direction D1 to ensure the flatness of the circuit board assembly 240 and avoid affecting the installation of electronic components. After the pin 130 exits the receiving groove 214, it can pass through the through hole 241 into the circuit board assembly 240 and then be soldered to the circuit board assembly 240.

[0084] Since the sealant 230 includes potting compound, to prevent excessive volume of sealant from forming and pushing against the circuit board assembly 240 during potting, thus affecting the flatness of the circuit board assembly 240 and the penetration of soldering material, in the embodiments of this application, such as Figure 4 and Figure 5 As shown, an overflow groove 215 is also provided on the second surface 2121, which is connected to the receiving groove 214. The overflow groove 215 allows excess sealant to overflow outward, preventing the sealant from protruding from the second surface 2121 and pushing against the circuit board assembly 240, thus affecting the flatness of the circuit board assembly 240 assembly and the penetration of the soldering material.

[0085] Specifically, the overflow groove 215 helps to form a receiving gap 202 between the potting compound and the circuit board assembly 240. Excess compound will overflow from the overflow groove 215. Therefore, there is no need to manually control the amount of compound to form the receiving gap 202 during the injection process, which helps to improve the injection efficiency.

[0086] It should be noted that the overflow groove 215 can be set at any position on the second surface 2121, as long as it is connected to the receiving groove 214.

[0087] In one embodiment, such as Figure 4 As shown, the overflow groove 215 has a first groove bottom wall 2151, and the distance H2 between the first groove bottom wall 2151 and the second surface 2121 is greater than or equal to 0.5mm. This setting can, on the one hand, avoid excessive sealing glue, so that the potting glue will not push the circuit board assembly 240, effectively ensuring the flatness of the circuit board assembly 240 installation. On the other hand, H2 greater than or equal to 0.5mm also helps to form the receiving gap 202, that is, the size of H2 is related to the size of the receiving gap 202. When the circuit board assembly 240 is set to abut against the second surface 2121, the distance H2 between the first groove bottom wall 2151 and the second surface 2121 is the minimum distance of the receiving gap 202. The existence of the receiving gap 202 can facilitate the penetration of molten solder and contain the solder, thereby increasing the connection stability between the pin 130 and the circuit board assembly 240.

[0088] Furthermore, the value of H2 can be between 0.5mm and 5mm. Even further, the value of H2 can be between 0.5mm and 2mm.

[0089] For example, the value of H2 can be 0.5mm, 0.6mm, 1mm, 2mm, 3mm, 5mm or any value between any two of the above.

[0090] In the embodiments of this application, when the sealant is poured to form the sealant 230, the second surface 2121 can be used as a reference for the pouring process. Specifically, as shown in the following example... Figure 4 As shown, the seal 230 has a fourth surface 231 facing the receiving chamber 201, such that the distance H3 between the fourth surface 231 and the second surface 2121 is greater than or equal to 0.5 mm.

[0091] Furthermore, the value of H3 can be between 0.5mm and 5mm. Even further, the value of H3 can be between 0.5mm and 2mm.

[0092] For example, the value of H3 can be 0.5mm, 0.6mm, 1mm, 2mm, 3mm, 5mm or any value between any two of the above.

[0093] In the embodiments of this application, such as Figure 4 As shown, the dimension of the receiving groove 214 in the first direction D1 extending from the pin hole 213 is between 2mm and 20mm. Specifically, the receiving groove 214 has a second groove bottom wall 2141, and the distance H4 between the second groove bottom wall 2141 and the second surface 2121 is between 2mm and 20mm. This arrangement ensures that the receiving groove 214 has a sufficiently large depth to accommodate the seal 230, thereby improving the moisture barrier effect of the seal 230.

[0094] Furthermore, the distance H4 between the bottom wall 2141 of the second groove and the second surface 2121 is between 3mm and 10mm.

[0095] For example, the value of H4 can be 2mm, 3mm, 5mm, 10mm, 15mm, 20mm or any value between any two of the above.

[0096] In the embodiments of this application, such as Figure 5 and Figure 6 As shown, in the first direction D1 section perpendicular to the extension direction of the pin hole 213, the cross-sectional area of ​​the receiving groove 214 is S1; in the section perpendicular to the extension direction of the pin hole 213, the cross-sectional area of ​​the pin hole 213 is S2, and S1 and S2 satisfy: 1.5≤S1:S2≤20. Furthermore, S1 and S2 can also satisfy: 1.5≤S1:S2≤10.

[0097] The larger the area of ​​the receiving groove 214, the larger the volume of the seal 230 that can be filled inside, which helps to ensure the sealing between the pin 130 and the control box 200. For example, the ratio of S1:S2 can be 1.5, 2, 3, 4.5, 5, 6, 9, 10, 12, 15, 20 or any value between any two of the above.

[0098] In the embodiments of this application, such as Figure 5 and Figure 6As shown, there are multiple pin holes 213, multiple receiving grooves 214, and multiple receiving grooves 214 are arranged one-to-one with multiple pin holes 213. There are multiple overflow grooves 215, and multiple overflow grooves 215 are arranged one-to-one with multiple receiving grooves 214. The pin 130 can pass through the pin holes 213 and receiving grooves 214 in sequence. When processing the seal 230, excess sealant can overflow from the overflow grooves 215. On the one hand, this ensures the waterproof effect at the pin, and on the other hand, it facilitates the formation of a receiving gap 202 between the seal 230 and the circuit board assembly 240 to accommodate soldering material without the need for manual control of the amount of sealant injected.

[0099] It should be noted that, as Figure 6 As shown, the multiple receiving slots 214 can be separated by baffles 216. The surface of the baffles 216 facing the receiving chamber 201 is flush with the second surface 2121 to increase the contact area between the connecting part 212 and the circuit board assembly 240, thereby ensuring the flatness and stability of the circuit board assembly 240.

[0100] In other embodiments, the pin holes 213 may also include multiple holes, and the number of receiving grooves 214 is less than the number of pin holes 213. Multiple pin holes 213 communicate with the receiving grooves 214, and at least one overflow groove 215 is provided. This arrangement makes the structure of the connection part simpler and facilitates the processing of the overflow groove 215.

[0101] It should also be noted that when multiple receiving slots 214 are arranged in a one-to-one correspondence with multiple pin holes 213, the cross-sectional area of ​​the receiving slot 214, S1, is at least 1.5 times the cross-sectional area of ​​the pin hole 213, S2. When there is one receiving slot 214 and the number of pin holes 213 is n (n≥2), the cross-sectional area of ​​the receiving slot 214, S1, is at least 1.5n times the cross-sectional area of ​​the pin hole 213, S2.

[0102] like Figure 7 and Figure 8 As shown, in some embodiments of this application, a waterproof structure is provided between the coil 100 and the control box 200. The waterproof structure is located on the outer periphery of the through hole. The waterproof structure includes a waterproof part 218 provided in the control box 200 and a waterproof mating part 122 provided in the coil 100. The waterproof part 218 is connected to the waterproof mating part 122 to increase the connection area between the coil 100 and the control box 200.

[0103] In the above structure, the waterproof structure has the function of increasing the connection area between the coil 100 and the control box 200. On the one hand, increasing the connection area between the coil 100 and the control box 200 can improve the connection stability between the coil 100 and the control box 200, reduce the probability of the coil 100 and the control box 200 becoming loose due to external forces or other factors, and thus make it difficult for water to enter the through hole.

[0104] On the other hand, increasing the connection area between coil 100 and control box 200 also increases the complexity of the connection gap between coil 100 and control box 200. That is to say, for water vapor to enter the through hole, it needs to first pass through the connection gap between fixing part 217 and coil 100, then through the connection gap between waterproof part 218 and coil 100, and finally enter the through hole. This process increases the length and tortuosity of the water vapor flow path, thereby effectively reducing the probability of water vapor entering the through hole.

[0105] like Figure 7 and Figure 8 As shown, in some embodiments of this application, the control box 200 includes a first box wall 211 and a connecting portion 212 disposed on the first box wall 211; the first box wall 211 has a first surface 2111 facing the receiving chamber 201 and a third surface 2112 facing the coil 100, and the waterproof portion 218 may include an annular groove 2181 recessed into the third surface 2112. Correspondingly, the waterproof mating portion 122 on the outer shell 120 may be a boss structure extending into the annular groove 2181, the boss structure conforming to the annular groove 2181 to ensure that the boss structure and the annular groove 2181 can be tightly connected.

[0106] It should be noted that multiple annular grooves 2181 can be provided, with multiple annular grooves 2181 sequentially arranged between the through hole and the fixing part 217. That is to say, for water vapor to enter the through hole, it needs to pass through the gap between multiple annular grooves 2181 and the boss structure. This structure further enhances the water-blocking effect of the waterproof part 218 on water vapor.

[0107] It should also be noted that, since the waterproof part 218 is surrounded on the periphery of the through hole, the waterproof part 218 can block water vapor entering the through hole in all directions, thereby further ensuring the dryness and cleanliness of the receiving chamber 201.

[0108] In other embodiments, the waterproof portion may include an annular boss protruding from the third surface. Accordingly, the waterproof mating portion on the housing may be a groove structure that accommodates the annular boss, the groove structure conforming to the annular boss to ensure a tight connection between the annular boss and the groove structure.

[0109] It should be noted that multiple annular protrusions can be provided, with multiple annular protrusions sequentially arranged between the through hole and the fixing part 217. That is to say, in order for water vapor to enter the through hole, it needs to pass through the gaps between multiple annular protrusions and the groove structure, further improving the water-blocking effect of the waterproof part 218.

[0110] Of course, in other embodiments, the waterproof part 218 may also include an annular boss protruding from the third surface 2112 and an annular groove 2181 recessed into the third surface 2112. The annular boss may be located outside the annular groove 2181 or inside the annular groove 2181, and this embodiment does not limit this.

[0111] Furthermore, such as Figure 7 and Figure 8 As shown, in some embodiments of this application, a fixing structure is also provided between the coil 100 and the control box 200. The fixing structure is located on the outer periphery of the waterproof structure and is used to fix the control box 200 and the coil 100.

[0112] Specifically, the fixing structure includes a fixing engagement part 121 disposed on the control box 200 and a fixing engagement part 121 disposed on the coil 100. The fixing part 217 is connected to the fixing engagement part 121 to improve the connection stability between the coil 100 and the control box 200.

[0113] Specifically, such as Figure 7 and Figure 8 As shown, in some embodiments of this application, the fixing part 217 includes a fixing groove 2171 recessed in the third surface 2112, and correspondingly, the fixing mating part 121 on the housing 120 is a fixing protrusion that can be inserted into the fixing groove 2171.

[0114] Alternatively, in other embodiments, the fixing part 217 may include a fixing protrusion protruding from the third surface 2112, and correspondingly, the fixing mating part 121 on the housing 120 is a fixing groove that can accommodate the fixing protrusion.

[0115] Alternatively, in other embodiments, the fixing part 217 includes a fixing groove 2171 and a fixing protrusion, wherein the fixing groove 2171 is disposed on the outer or inner side of the fixing protrusion. The fixing mating part 121 conforms to the fixing part 217.

[0116] It should be noted that, in one specific embodiment of this application, as Figure 7 and Figure 8 As shown, when the waterproof part 218 includes an annular groove 2181 recessed into the third surface 2112, and the fixing part 217 includes a fixing groove 2171 recessed into the third surface 2112, the depth of the annular groove 2181 is greater than the depth of the fixing groove 2171. This arrangement increases the connection area between the coil 100 and the control box 200 through the annular groove 2181, thereby increasing the connection strength between the two.

[0117] Accordingly, when the waterproof part 218 includes an annular boss protruding from the third surface 2112, and the fixing part 217 includes a fixing protrusion protruding from the third surface 2112, the protrusion height of the annular boss is greater than the protrusion height of the fixing protrusion. This arrangement increases the connection area between the coil 100 and the housing through the annular boss, thereby increasing the connection strength between the two.

[0118] It should also be noted that the connection between the coil 100 and the control box 200 can be a plug-in connection, injection molding connection, or soldering.

[0119] Preferably, the coil 100 and the control box 200 can be connected by injection molding. Further, the outer shell 120 is injection molded with the stator assembly 110 and the first housing 210 as a mating body. During injection molding, the first housing 210 and the stator assembly 110 of the coil 100 can be placed into the injection mold as a mating body. Specifically, the pins 130 in the stator assembly 110 can be inserted into the through holes of the first housing 210 to form a stable mating body between the stator assembly 110 and the first housing 210, which is then processed into the outer shell 120 by injection molding. During injection molding, because the injection molding material is flowable, the structure of the outer shell 120 can achieve a conformal fit with the first housing 210.

[0120] It should be noted that the timing of the glue injection can be chosen after the coil 100 and the first housing 210 are injection molded and connected, at which time the coil 100 and the first housing 210 can form a stable connection relationship, so as to facilitate the glue injection operation; or it can be chosen after the stator assembly 110 and the first housing 210 are assembled into a fitting, and the outer shell 120 is formed by injection molding. In this case, the glue injection has the function of pre-positioning the stator assembly 110 and the first housing 210.

[0121] Specifically, such as Figure 7 As shown, the outer casing 120 may include a waterproof mating part 122 and a fixed mating part 121. The waterproof mating part 122 and the fixed mating part 121 are injection molded with the stator assembly 110 and the first housing 210 as inserts, that is, the waterproof mating part 122 is injection molded to the waterproof part 218; the fixed mating part 121 is injection molded to the fixed part 217.

[0122] Furthermore, to improve the tightness of the injection molding connection between the coil 100 and the control box 200, welding ribs can be provided on the first housing 210. During injection molding, the welding ribs can be partially melted to improve the tightness of the connection with the coil 100.

[0123] Specifically, such as Figure 8As shown, in some embodiments, the waterproof portion 218 includes a first weld rib 2191, which is disposed on the surface of the waterproof portion 218 facing the coil 100. That is, the first weld rib 2191 can be disposed on the surface at any position where the waterproof portion 218 and the coil 100 are connected. Correspondingly, the waterproof mating portion 122 may be provided with a first weld groove that mates with the first weld rib 2191.

[0124] Additionally, a second welding rib 2192 may be provided on the fixing part 217. Correspondingly, a second welding groove that mates with the second welding rib 2192 is provided on the fixing mating part 121.

[0125] This application also provides an electric valve (not shown in the figure). An embodiment of the electric valve of this application includes a valve body assembly and a coil assembly 10. The coil assembly 10 is used to regulate the flow rate of the valve body assembly, and the implementation of the coil assembly 10 has been described above.

[0126] For example, the electric valve can be an electronic expansion valve. In other embodiments, the electric valve can also be other valves with a control box, and is not limited to this embodiment.

[0127] It should be noted that the electric valves shown in the accompanying drawings and described in this specification are merely a few examples among many electric valves capable of employing the principles of this invention. It should be clearly understood that the principles of this invention are by no means limited to any detail or component of the electric valves shown in the accompanying drawings or described in this specification.

[0128] Finally, it should be noted that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described in detail here.

[0129] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0130] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0131] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A coil assembly for an electrically operated valve, characterised in that, include: Coil (100), including pin (130); The control box (200) includes a receiving chamber (201) for receiving a circuit board assembly (240); the control box (200) is provided with a through hole communicating with the receiving chamber (201), and the pin (130) passes through the through hole; The control box (200) further includes a sealing element (230), which is disposed between the through hole and the pin (130) to seal the gap between the pin (130) and the wall of the through hole.

2. The coil assembly of claim 1, wherein, The through hole includes a pin hole (213) and a receiving groove (214). The pin hole (213) communicates with the receiving chamber (201) through the receiving groove (214). The pin (130) passes through the pin hole (213) and the receiving groove (214). The seal (230) is disposed in the receiving groove (214) to seal the gap between the pin (130) and the groove wall of the receiving groove (214).

3. The coil assembly of claim 2, wherein, The seal (230) includes a potting compound that fills the space between the pin (130) and the wall of the receiving groove (214).

4. The coil assembly of claim 2, wherein, The seal (230) includes an elastic seal that seals between the outer wall of the pin (130) and the groove wall of the receiving groove (214).

5. The coil assembly of claim 2, wherein, The control box (200) also includes a circuit board assembly (240) disposed in the receiving chamber (201); The circuit board assembly (240) is provided with a through hole (241), the pin (130) passes through the pin hole (213) and the receiving groove (214) and extends into the receiving chamber (201), and the pin (130) passes through the through hole (241); There is a receiving gap (202) between the circuit board assembly (240) and the seal (230).

6. The coil assembly of claim 5, wherein, The dimension of the receiving gap (202) in the extension direction of the pin hole (213) is greater than or equal to 0.5 mm.

7. The coil assembly of any of claims 2-6, wherein, The control box (200) includes a first box wall (211) and a connecting portion (212) disposed on the first box wall (211); The first box wall (211) has a first surface (2111) facing the receiving chamber (201), the connecting part (212) has a second surface (2121) facing the receiving chamber (201), the second surface (2121) protrudes from the first surface (2111), and the receiving groove (214) is formed on the second surface (2121).

8. The coil assembly of claim 5, wherein, The control box (200) includes a first box wall (211) and a connecting portion (212) disposed on the first box wall (211); The first box wall (211) has a first surface (2111) facing the receiving chamber (201), the connecting part (212) has a second surface (2121) facing the receiving chamber (201), the second surface (2121) protrudes from the first surface (2111), and the receiving groove (214) is formed on the second surface (2121); The circuit board assembly (240) abuts against the second surface (2121).

9. The coil assembly of claim 7, wherein, An overflow groove (215) is also provided on the second surface (2121), and the overflow groove (215) is connected to the receiving groove (214).

10. The coil assembly of claim 9, wherein, The overflow trough (215) has a first bottom wall (2151), and the distance between the first bottom wall (2151) of the overflow trough (215) and the second surface (2121) is greater than or equal to 0.5 mm.

11. The coil assembly of claim 9, wherein, The pin holes (213) include a plurality of pin holes (213) which are connected to the receiving groove (214), and the overflow groove (215) is provided as at least one.

12. The coil assembly of claim 9, wherein, The pin holes (213) include a plurality of pin holes (213), and the receiving grooves (214) include a plurality of pin holes (214), with each of the plurality of receiving grooves (214) corresponding to one of the plurality of pin holes (213). The overflow trough (215) includes multiple overflow troughs, and each of the multiple overflow troughs (215) is provided in a one-to-one correspondence with the multiple receiving troughs (214).

13. The coil assembly of any one of claims 2-6, wherein, In a cross section perpendicular to the extension direction of the pin hole (213), the area of ​​the receiving groove (214) is S1; in a cross section perpendicular to the extension direction of the pin hole (213), the area of ​​the pin hole (213) is S2, and S1 and S2 satisfy: 1.5≤S1:S2≤20; And / or, the dimension of the receiving groove (214) in the extension direction of the pin hole (213) is between 2mm and 20mm.

14. The coil assembly of any one of claims 1-6, wherein, A waterproof structure is provided between the coil (100) and the control box (200). The waterproof structure is located on the outer periphery of the through hole. The waterproof structure includes a waterproof part (218) provided in the control box (200) and a waterproof mating part (122) provided in the coil (100). The waterproof part (218) is connected to the waterproof mating part (122) to increase the connection area between the coil (100) and the control box (200).

15. The coil assembly of claim 14, wherein, The control box (200) includes a first box wall (211) and a connecting portion (212) disposed on the first box wall (211); the first box wall (211) has a first surface (2111) facing the receiving chamber (201) and a third surface (2112) facing the coil (100); The waterproof part (218) includes an annular boss protruding from the third surface (2112); And / or, The waterproof part (218) includes an annular groove (2181) recessed into the third surface (2112).

16. The coil assembly of claim 14, wherein, A fixing structure is also provided between the coil (100) and the control box (200). The fixing structure is located on the outer periphery of the waterproof structure. The fixing structure includes a fixing part (217) provided on the control box (200) and a fixing mating part (121) provided on the coil (100). The fixing part (217) is connected to the fixing mating part (121).

17. The coil assembly according to claim 16, characterized in that, The control box (200) includes a first box wall (211) and a connecting portion (212) disposed on the first box wall (211); the first box wall (211) has a first surface (2111) facing the receiving chamber (201) and a third surface (2112) facing the coil (100); The fixing part (217) includes a fixing groove recessed into the first surface (2111); And / or, The fixing part (217) includes a fixing protrusion protruding from the first surface (2111).

18. An electrically powered valve characterised in that, include: Valve body assembly; A coil assembly (10) for adjusting the flow rate of the valve body assembly, wherein the coil assembly (10) is the coil assembly according to any one of claims 1-17.

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