Variable frequency controller with sealing structure

Abstract

The frequency conversion controller with the sealing structure comprises a shell, a PCB assembly and an EMC assembly, the shell is composed of an upper cover and a lower cover, the lower cover is provided with a conductive wiring cavity, the upper cover covers the conductive wiring cavity, a wiring terminal is arranged in the conductive wiring cavity and extends to the surface of the lower cover and the surface of the upper cover, and the lower cover is provided with a sealing cover. The PCB assembly is connected with the EMC assembly through a wiring terminal, a sealing groove is formed in the edge of the lower cover, sealant is arranged in the sealing groove, a sealing plate capable of being inserted into the sealing groove in a paired mode is arranged on the edge of the upper cover, a lead sleeve is arranged in the conductive wiring cavity, the lead sleeve is made of elastic rubber, a threading hole is formed in the lead sleeve, and the lead sleeve extends to the surface of the lower cover. After the lower cover and the upper cover are combined, the inner walls of the lower cover and the upper cover tightly press the surface of the lead sleeve, and the sealing plate is inserted into the sealing groove, so that the conductive wiring cavity is sealed, dust is effectively prevented from entering the conductive wiring cavity, and dust and water are prevented from falling on the joint of the output line and corroding the joint.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of controller, especially variable frequency controller with sealing structure. BACKGROUND

[0002] The controller for electric tool is a device for controlling mechanical quantity, working sequence and operation mode by controlling electric quantity of electric tool, which is mainly connected with brushless motor in electric tool. With the continuous progress of lithium battery technology and the continuous change of consumer demand, the electric tool industry presents the development trend of cordless, lithium battery, integration and intelligent. As the core component of electric tool, the controller plays a key role in promoting the development of this trend.

[0003] As Figure 1 Described, the structure of the controller for electric tool on the market includes PCB assembly 1, switch 3 and EMC assembly 2, EMC assembly 2 is connected with PCB assembly 1 through two input lines 5, motor is connected with PCB assembly 1 through three output lines 4, and switch 3 is connected with PCB assembly 1 through flat cable.

[0004] In the prior art controller, the three output lines 4 and the two input lines 5 are directly welded on the circuit board of the PCB assembly 1, without waterproof and dustproof functions, and the use scene of the electric tool is mostly construction site, which is often dusty and humid, so that dust and water can easily enter the electric tool to corrode the connection part of the circuit and cause failure. UTILITY MODEL CONTENT

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a variable frequency controller with sealing structure, which can effectively solve the technical problem of no waterproof and dustproof functions.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] A frequency converter with a sealed structure includes a housing, a PCB assembly, and an EMC assembly. The EMC assembly is electrically connected to the PCB assembly. The housing consists of an upper cover and a lower cover. The PCB assembly and the EMC assembly are respectively installed in the lower cover and the upper cover. A conductive wiring cavity is provided at one end of the lower cover close to the upper cover. The upper cover is used to cover the conductive wiring cavity. The conductive wiring cavity is provided with wiring terminals and extends to the surfaces of the lower cover and the upper cover. The PCB assembly and the EMC assembly are connected via the wiring terminals. A sealing groove is provided at the edge of the lower cover. Sealant is provided in the sealing groove. A sealing plate that can be mated and inserted into the sealing groove is provided at the edge of the upper cover. A lead sleeve is provided in the conductive wiring cavity. The lead sleeve is made of elastic rubber and has a threading hole. The lead sleeve extends to the surface of the lower cover. After the lower cover and the upper cover are combined, the inner walls of the lower cover and the upper cover press the surface of the lead sleeve. The sealing plate is inserted into the sealing groove to seal the conductive wiring cavity.

[0008] Furthermore, a wire sleeve is provided in the conductive wiring cavity. The wire sleeve is made of elastic rubber and a wire threading groove is provided on the wire sleeve. The wire sleeve extends to the surface of the lower cover. After the lower cover and the upper cover are combined, the inner walls of the lower cover and the upper cover press the surface of the wire sleeve.

[0009] Furthermore, a raised extrusion strip is provided on the surface of the lead sleeve, and the extrusion strip is elastically deformed when being squeezed by the upper cover or the lower cover.

[0010] Furthermore, the connection terminal includes an input terminal and an output terminal, the pins of the output terminal are welded to the PCB assembly, and the two ends of the input terminal are connected to the PCB assembly and the EMC assembly.

[0011] Furthermore, the surfaces of the upper cover and the lower cover are provided with mounting grooves, and the PCB assembly and the EMC assembly are respectively arranged in the mounting grooves of the lower cover and the upper cover.

[0012] Furthermore, the mounting groove is filled with epoxy resin, and the epoxy resin fixes the PCB assembly and the EMC assembly in the mounting groove.

[0013] Furthermore, the lower cover and the upper cover are detachably connected by bolts.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: a lower cover and an upper cover are provided, a conductive wiring cavity is provided on the lower cover, and the conductive wiring cavity is in a sealed state after the upper cover and the lower cover are combined, the output line passes through the wire threading hole of the lead sleeve and enters the conductive wiring cavity to be connected to the wiring terminal, the lead sleeve is made of elastic rubber, the inner wall of the wire threading hole squeezes the surface of the output line, avoiding the formation of a gap between the lead sleeve and the output line, and after the lower cover and the upper cover are combined, the surface of the lead sleeve is squeezed, avoiding the formation of a gap between the lead sleeve and the lower cover and the upper cover, and the lower cover and the upper cover are sealed by a sealant, effectively preventing dust from entering the conductive wiring cavity, and preventing dust and water from falling on the connection of the output line and corroding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the prior art;

[0016] Figure 1 The winning bid number: 1-PCB assembly, 2-EMC assembly, 3-switch, 4-output line, 5-input line.

[0017] Figure 2 It is a three-dimensional schematic diagram of the utility model;

[0018] Figure 3 This is the main exploded view of the present invention;

[0019] Figure 4 This is an exploded view from above of the present invention;

[0020] Figure 5 This is a schematic diagram of the lead sleeve in the utility model;

[0021] Figure 6 This is a schematic diagram of the cable tray in the present invention;

[0022] Figure 2-6 Winning bid number: 1-PCB assembly, 2-EMC assembly, 3-upper cover, 4-lower cover, 5-conductive wiring cavity, 6-wiring terminal, 7-sealing groove, 8-sealing plate, 9-lead sleeve, 901-wire hole, 902-extrusion strip, 10-wire sleeve, 1001-wire groove, 11-bolt, 12-positioning groove, 13-installation groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The following combination Figure 2-Figure 6 The frequency conversion controller with a sealing structure of the utility model is described in detail:

[0025] A frequency converter with a sealed structure includes a housing, a PCB assembly 11, and an EMC assembly 2. The EMC assembly 2 is electrically connected to the PCB assembly 11. The housing is composed of an upper cover 3 and a lower cover 4. The PCB assembly 11 and the EMC assembly 2 are respectively installed in the lower cover 4 and the upper cover 3. The lower cover 4 is provided with a conductive wiring cavity 5 at one end close to the upper cover 3. The upper cover 3 is used to cover the conductive wiring cavity 5. The conductive wiring cavity 5 is provided with a terminal 6 and extends to the surface of the lower cover 4 and the upper cover 3. The PCB assembly 11 and the EMC assembly 2 are connected through the terminal 6. The edge of the lower cover 4 is provided with a sealing groove 7. The sealing groove 7 is provided with a sealant. The edge of the upper cover 3 is provided with a sealing groove 7 that can be inserted into the sealing groove 7. The sealing plate 8 is provided in the conductive wiring cavity 5. The lead sleeve 9 and the cable sleeve 10 are both made of elastic rubber. The lead sleeve 9 is provided with a wire threading hole 901, and the lead sleeve 9 is provided with a wire threading groove 1001. The lead sleeve 9 and the cable sleeve 10 extend to both ends of the side wall of the lower cover 4 respectively. After the lower cover 4 is combined with the upper cover 3, the inner wall of the lower cover 4 and the upper cover 3 presses the surface of the lead sleeve 9 and the cable sleeve 10. The surface of the lead sleeve 9 is provided with a raised extrusion strip 902. When the extrusion strip 902 is squeezed by the upper cover 3 or the lower cover 4, it is elastically deformed to avoid gaps around the lead sleeve 9 and the cable sleeve 10. The sealing plate 8 is inserted into the sealing groove 7 to seal the conductive wiring cavity 5.

[0026] The frequency converter with a sealed structure of this embodiment is provided with a lower cover 4 and an upper cover 3. The lower cover 4 is provided with a conductive wiring cavity 5. When the upper cover 3 is combined with the lower cover 4, the conductive wiring cavity 5 is in a sealed state. The output line passes through the wire hole 901 of the lead sleeve 9 and enters the conductive wiring cavity 5 to be connected to the terminal 6. The lead sleeve 9 is made of elastic rubber. The inner wall of the wire hole 901 squeezes the surface of the output line to avoid a gap between the lead sleeve 9 and the output line. When the lower cover 4 and the upper cover 3 are combined, the surface of the lead sleeve 9 is squeezed to avoid a gap between the lead sleeve 9 and the lower cover 4 and the upper cover 3. The lower cover 4 and the upper cover 3 are sealed by a sealant, which effectively prevents dust from entering the conductive wiring cavity 5 and prevents dust and water from falling on the connection of the output line and corroding it. The terminal 6 includes an input terminal and an output terminal. The pin of the output terminal is welded to the PCB assembly 11. The two ends of the input terminal are connected to the PCB assembly 11 and the EMC assembly 2. Since the input terminal is arranged in the conductive wiring cavity 5, the input end of the PCB assembly 11 can also be dustproof and waterproof.

[0027] The lower cover 4 and the upper cover 3 are detachably connected by bolts 11. When wiring is required, the upper cover 3 can be removed, and the output line is passed through the wire hole 901 of the lead sleeve 9. A positioning groove 12 is provided in the conductive wiring cavity 5. The lead sleeve 9 with the wire passed through is placed in the positioning groove 12, and a sealing rubber ring is placed in the sealing groove 7. After the upper cover 3 covers the lower cover 4, it is locked by the bolts 11 to seal the conductive wiring cavity 5.

[0028] The surfaces of the upper cover 3 and the lower cover 4 are provided with mounting grooves 13, and the PCB assembly 11 and the EMC assembly 2 are respectively arranged in the mounting grooves 13 of the lower cover 4 and the upper cover 3. The mounting grooves 13 are filled with epoxy resin, which fixes the PCB assembly 11 and the EMC assembly 2 in the mounting grooves 13. The PCB assembly 11 includes a main control circuit board, IGBTs, capacitors, resistors and heat sinks. The IGBTs, capacitors and resistors are all welded to the main control circuit board. The heat sink is fitted with the IGBTs for heat dissipation. A cable interface is provided on the main control circuit board. The terminal pins of the output terminals and the input terminals pass through the main control circuit board and are welded. The EMC assembly 2 includes a control circuit board, a common-mode inductor and capacitors. The inductor and capacitor are soldered to the control circuit board, and the end of the connector away from the input terminal is inserted into the control circuit board. The functions and operating principles of PCB assembly 11 and EMC assembly 2 are common knowledge and conventional technical means in the field. Those skilled in the art are aware of or can easily obtain relevant information, so they will not be described in detail again. Epoxy resin sealing can firmly fix the various components of the circuit board together to form an integrated structure, thereby improving the mechanical strength of the circuit board, making it more resistant to external shock and vibration, and reducing the risk of wire detachment and solder joint breakage. In industrial environments, circuit boards are easily corroded by harmful substances such as dust, moisture, and chemical liquids, leading to problems such as short circuits and leakage. Epoxy resin has excellent waterproof, wear-resistant, and chemical corrosion-resistant properties, which can effectively isolate these external harmful substances and protect the circuit board from damage.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A frequency converter with a sealed structure, comprising a housing, a PCB assembly, and an EMC assembly, wherein the EMC assembly is electrically connected to the PCB assembly, and is characterized in that: The housing is composed of an upper cover and a lower cover, and the PCB assembly and the EMC assembly are respectively installed in the lower cover and the upper cover. A conductive wiring cavity is provided at one end of the lower cover close to the upper cover, and the upper cover is used to cover the conductive wiring cavity. The conductive wiring cavity is provided with wiring terminals and extends to the surfaces of the lower cover and the upper cover. The PCB assembly and the EMC assembly are connected through the wiring terminals. A sealing groove is provided at the edge of the lower cover, and a sealant is provided in the sealing groove. A sealing plate that can be matched and inserted into the sealing groove is provided at the edge of the upper cover. A lead sleeve is provided in the conductive wiring cavity, and the lead sleeve is made of elastic rubber and is provided with a wire threading hole. The lead sleeve extends to the surface of the lower cover. After the lower cover and the upper cover are combined, the inner walls of the lower cover and the upper cover press the surface of the lead sleeve, and the sealing plate is inserted into the sealing groove to seal the conductive wiring cavity.

2. The frequency conversion controller with a sealing structure according to claim 1, characterized in that: A wire sleeve is also provided in the conductive wiring cavity. The wire sleeve is made of elastic rubber and has a wire threading groove. The wire sleeve extends to the surface of the lower cover. After the lower cover and the upper cover are combined, the inner walls of the lower cover and the upper cover press the surface of the wire sleeve.

3. The frequency conversion controller with a sealing structure according to claim 1, characterized in that: The surface of the lead sleeve is provided with a raised extrusion strip, which generates elastic deformation when being squeezed by the upper cover or the lower cover.

4. The frequency conversion controller with a sealing structure according to any one of claims 1 to 3, characterized in that: The connection terminal comprises an input terminal and an output terminal, the pins of the output terminal are welded to the PCB assembly, and the two ends of the input terminal are connected to the PCB assembly and the EMC assembly.

5. The frequency conversion controller with a sealing structure according to any one of claims 1 to 3, characterized in that: The surfaces of the upper cover and the lower cover are provided with mounting grooves, and the PCB assembly and the EMC assembly are respectively arranged in the mounting grooves of the lower cover and the upper cover.

6. The frequency conversion controller with a sealing structure according to claim 5, characterized in that: The mounting groove is filled with epoxy resin, and the epoxy resin fixes the PCB component and the EMC component in the mounting groove.

7. The frequency conversion controller with a sealing structure according to any one of claims 1 to 3, characterized in that: The lower cover and the upper cover are detachably connected by bolts.

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