Commercial refrigeration compressor motor starter structure matched with an electrical junction box

Abstract

A kind of commercial refrigeration compressor motor starter structure matched with electrical junction box, including motor starter assembly, assembly includes starter box body, starter box body cover, first, second PTC and first, second electrode sheet, starter box body cover is embedded with starter box body, the middle part of starter box body has PTC installation cavity, rear end has current control mechanism cavity, front end has starting capacitor electrical connection foot cavity, PTC installation cavity is separated by rear partition between current control mechanism cavity, PTC installation cavity is separated by front side wall between starting capacitor electrical connection foot cavity, the rear end of first electrode sheet has the flexible pressing foot of PTC electrical contact controlled silicon control, middle part has the flexible pressing foot of second PTC upper side electrical contact, front end has starter capacitor electrical connection foot, the rear end of second electrode has the flexible pressing foot of bidirectional thyristor electrical contact, middle part has the flexible pressing foot of second PTC lower side electrical contact.Advantages: modular effect is good, meet the matching installation requirement of fast and efficient.

Description

Technical Field

[0001] This invention belongs to the technical field of refrigeration compressor motor starting devices, specifically relating to a structure of a commercial refrigeration compressor motor starter that is compatible with an electrical junction box. Background Technology

[0002] The aforementioned electrical junction box is an essential auxiliary component for refrigeration compressors. When a refrigeration device, such as a refrigerator, is connected to the circuit, the compressor must first be fixed to the refrigerator before it can be connected to the refrigerator's power supply, due to the need for overall wiring and pipe welding within the refrigeration device.

[0003] The aforementioned commercial refrigeration compressors are in contrast to household refrigeration compressors. Specifically, the former are mainly used in industrial and commercial channels, such as manufacturers of frozen and refrigerated products, supermarkets, hotels, restaurants, etc. The starting power of commercial refrigeration compressors is relatively larger than that of household refrigeration compressors. As is known in the industry, whether it is a commercial or household refrigeration compressor, a starter is usually connected or connected in series in the starting circuit of the refrigeration compressor. The purpose of setting up the starter is to provide the starting winding with a starting current greater than the normal operating current of the motor at the moment the refrigeration compressor starts. For example, if the rated operating current of the compressor is 1A, the starting current is 4-7A. After the compressor has finished starting, the current will drop rapidly to the aforementioned rated current level, and the motor starter will disconnect because there is no sufficient current to maintain it. This achieves high-current starting and low-current (normal current) operation of the compressor.

[0004] Technical information related to commercial refrigeration compressor motor starters is frequently found in Chinese patent literature, such as CN004113235A, CN104104277A, CN104104278A, CN104104276A, CN104113236A, CN104113237A, CN104104274A, CN104104275A, CN104579025A, CN104601051A, CN104579024A, CN104638986A, and CN106374783B, etc.

[0005] Because existing technologies install the aforementioned commercial refrigeration compressor motor starter and electrical junction box on the refrigeration compressor in an independent manner, the following technical problems exist: First, since the commercial refrigeration compressor motor starter and electrical junction box form independent separate structures, they cannot meet the expected requirements for miniaturization and relatively space-saving modularity; second, it increases the workload of electrical wiring connections, which is not conducive to meeting the requirements for fast and efficient installation; third, because the commercial refrigeration compressor motor starter and electrical junction box are independent, the arrangement of the PTC, the first electrode plate (also called the first electrical connector) electrically contacting one side of the PTC, the second electrode plate (also called the second electrical connector) electrically contacting the other side of the PTC, and the bidirectional thyristor and / or capacitors (including starting capacitors and running capacitors) that are added as needed as part of the AC electronic switch category are relatively messy and lack neatness and appearance. Based on the foregoing, it is of positive significance to design a commercial refrigeration compressor motor starter structure that can be well matched with electrical junction boxes. The technical solution to be introduced below is generated in this context. Summary of the Invention

[0006] The objective of this invention is to provide a commercial refrigeration compressor motor starter structure that is compatible with electrical junction boxes, which helps to achieve good modularity, can be seamlessly integrated into electrical junction boxes, meets the requirements for rapid and efficient installation, and enhances the ideal simplicity and aesthetics of the refrigeration compressor's exterior.

[0007] The objective of this invention is achieved as follows: a commercial refrigeration compressor motor starter structure compatible with an electrical junction box, comprising a motor starter assembly. The motor starter assembly includes a starter housing, a starter housing cover, a first PTCⅠ, a second PTCⅡ, a first electrode plate Ⅰ, and a second electrode plate Ⅱ. The starter housing cover is embedded in the starter housing at an open portion corresponding to the left side of the starter housing. A PTC mounting cavity is formed in the middle of the starter housing, a current control mechanism cavity is formed at the rear end, and a starting capacitor electrical connection pin cavity is formed at the front end. The PTC mounting cavity and the current control mechanism cavity are separated by a rear partition plate of the PTC mounting cavity. The lower left electrode plate of the PTC mounting cavity is separated by a recessed groove, and the upper left electrode plate of the PTC mounting cavity is also separated by a recessed groove on the upper left side of the partition plate. This allows the PTC mounting cavity to communicate with the current control mechanism cavity. The PTC mounting cavity and the starting capacitor electrical connection pin cavity are separated by the front sidewall of the PTC mounting cavity, and the PTC mounting cavity and the starting capacitor electrical connection pin cavity are connected by a recessed groove on the upper left sidewall of the front sidewall of the PTC mounting cavity. The first PTCⅠ is inserted horizontally at the front end of the PTC mounting cavity, and the second PTCⅡ is inserted horizontally at the rear end of the PTC mounting cavity, corresponding to the rear side of the first PTCⅠ. A PTC separation gap is maintained between the first PTCⅠ and the second PTCⅡ. The rear end of electrode plate I extends into the current control mechanism cavity through a recessed groove on the electrode plate and forms a thyristor-controlled PTC electrical contact elastic foot. This thyristor-controlled PTC electrical contact elastic foot makes electrical contact with the current control mechanism located within the current control mechanism cavity. A first PTC upper electrical contact elastic foot I is formed at the middle of the first electrode plate I, corresponding to the position of the first PTC I, and a second PTC upper electrical contact elastic foot II is formed at the position corresponding to the position of the second PTC II. The first PTC upper electrical contact elastic foot I makes electrical contact with the upper side of the first PTC I, and the second PTC upper electrical contact elastic foot II makes electrical contact with the upper side of the second PTC II. The front end extends through the electrode insert recess into the cavity of the starting capacitor electrical connection foot and forms a starting capacitor electrical connection foot. The rear end of the second electrode II extends through the electrode insert recess into the cavity of the current control mechanism and forms a bidirectional thyristor electrical contact holding foot. In the middle of the second electrode II, a first PTC lower electrical contact elastic foot I is formed at the position corresponding to the first PTC I, and a second PTC lower electrical contact elastic foot II is formed at the position corresponding to the second PTC II. The first PTC lower electrical contact elastic foot I is in electrical contact with the lower side of the first PTC I, and the second PTC lower electrical contact elastic foot II is in electrical contact with the lower side of the second PTC II.

[0008] In a specific embodiment of the present invention, the current control mechanism cavity includes a bidirectional thyristor insertion cavity and a thyristor-controlled PTC insertion cavity, which are interconnected. The current control mechanism includes a bidirectional thyristor, a thyristor-controlled PTC, a thyristor-controlled PTC electrical connection piece, and a bidirectional thyristor S-terminal electrical connection piece. The bidirectional thyristor is inserted into the bidirectional thyristor insertion cavity, and the thyristor-controlled PTC is inserted into the thyristor-controlled PTC insertion cavity. One end of the thyristor-controlled PTC electrical connection piece is electrically connected to the first pin of the bidirectional thyristor, while the other end of the thyristor-controlled PTC electrical connection piece... The end extends into the cavity of the thyristor-controlled PTC and makes electrical contact with one side of the thyristor-controlled PTC. One end of the bidirectional thyristor S-terminal electrical connection piece is electrically connected to the second pin of the bidirectional thyristor, while the middle part of the bidirectional thyristor S-terminal electrical connection piece extends out of the cavity of the bidirectional thyristor and fits into the outer wall of the starter housing. An S-terminal electrical connection pin is formed at the other end of the bidirectional thyristor S-terminal electrical connection piece. The bidirectional thyristor electrical contact retaining pin makes electrical contact with the third pin of the bidirectional thyristor, and the thyristor-controlled PTC electrical contact elastic pressing foot makes electrical contact with the other side of the thyristor-controlled PTC.

[0009] In another specific embodiment of the present invention, a starting capacitor electrical connection foot fixing screw hole is provided on the right wall of the starting capacitor electrical connection foot cavity, and a starting capacitor electrical connection foot fixing screw hole is provided on the starting capacitor electrical connection foot. The starting capacitor electrical connection foot fixing screw passes through the starting capacitor electrical connection foot fixing screw hole and the starting capacitor electrical connection foot fixing screw hole in sequence, and is locked by a screw locking nut located in the nut cavity on the front right side of the starter housing and screwed onto the starting capacitor electrical connection foot fixing screw.

[0010] In another specific embodiment of the present invention, a starter housing cover retaining foot and a starter housing cover engaging cavity are formed on the upper surface of the starter housing cover. A pair of starter housing cover positioning feet extend from the upper right side of the starter housing cover toward the starter housing. A housing cover retaining foot retaining groove is formed on the left side of the upper surface of the starter housing cover, corresponding to the position of the starter housing cover retaining foot. A starter housing cover engaging cavity engaging flange is formed at the position corresponding to the position of the starter housing cover engaging cavity. A starter housing cover positioning foot limiting groove is formed on the right cavity wall of the PTC mounting cavity, corresponding to the position of the pair of starter housing cover positioning feet. The starter housing cover retaining foot engages with the housing cover retaining foot retaining groove, the starter housing cover engaging cavity engaging flange engages with the starter housing cover engaging cavity, and each of the pair of starter housing cover positioning feet engages with the starter housing cover positioning foot limiting groove.

[0011] In another specific embodiment of the present invention, a pair of housing fixing grooves are formed at the bottom of the starter housing cover, and a pair of housing fixing groove fitting flanges are formed on the bottom wall of the starter housing at positions corresponding to the pair of housing fixing grooves, the pair of housing fixing groove fitting flanges fitting with the pair of housing fixing grooves.

[0012] In another specific embodiment of the present invention, an electrode support block is formed at intervals in the PTC mounting cavity of the starter housing, corresponding to the middle region of the first electrode plate I, and an electrode limiting pressure block is formed at intervals in the middle region of the second electrode plate II. The lower left end of the electrode limiting pressure block maintains an electrode slot corresponding to and communicating with the lower relief groove of the electrode plate between the bottom wall of the PTC mounting cavity and the electrode plate slot. The middle region of the first electrode plate I is supported on the electrode support block, and the middle region of the second electrode plate II is inserted into the electrode slot and limited by the electrode limiting pressure block.

[0013] In a further specific embodiment of the present invention, a PTC partition post extends to the left on the right cavity wall of the PTC mounting cavity and at a position corresponding to the first PTCⅠ and the second PTCⅡ, the PTC partition post protruding into the PTC partition gap between the first PTCⅠ and the second PTCⅡ.

[0014] In a further specific embodiment of the present invention, a bidirectional thyristor S-terminal electrical connection plate is formed on the left side of the top wall at the rear end of the starter housing. The space between the downward-facing side of the bidirectional thyristor S-terminal electrical connection plate and the top wall of the starter housing forms an electrical connection plate slot. The middle part of the bidirectional thyristor S-terminal electrical connection plate is inserted into the electrical connection plate slot after being led out of the bidirectional thyristor insertion cavity.

[0015] The technical advantages of the solution provided by this invention are as follows: Since the motor starter assembly adopts a starter housing with a starter housing cover, and since the first PTCⅠ, the second PTCⅡ, the first electrode plate Ⅰ and the second electrode plate Ⅱ are set in the PTC mounting cavity of the starter housing, it exhibits a good modular effect and can be matched with the electrical junction box without interference. It can also meet the requirements of fast and efficient matching and installation, and improve the ideal simplicity and appearance of the refrigeration compressor. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of the present invention.

[0017] Figure 2 for Figure 1Remove the starter housing cover and complete. Figure 1 A schematic diagram of the assembled components shown.

[0018] Figure 3 This is a schematic diagram of the present invention used in conjunction with an electrical junction box and in application with the electrical junction box. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0020] Below is Figure 1 and Figure 2 In the description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 Taking the current position as an example, while regarding... Figure 3 In the description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 3 The current position is used as an example and therefore should not be construed as a specific limitation on the technical solution provided by this invention.

[0021] Please see Figure 1 and Figure 2The diagram shows a motor starter assembly 3, which includes a starter housing 31, a starter housing cover 32, a first PTC I 33, a second PTC II 34, a first electrode I 35, and a second electrode II 36. The starter housing cover 32 is fixed to the starter housing 31 at the left opening corresponding to the left side of the starter housing 31. A PTC mounting cavity 311 is formed in the middle of the starter housing 31, and an electrode is formed at the rear end. The flow control mechanism cavity 312 is provided, while the front end of the starter housing 31 forms a starting capacitor electrical connection foot cavity 313. The aforementioned PTC mounting cavity 311 and the aforementioned current control mechanism cavity 312 are separated by a PTC mounting cavity rear partition plate 314 and further separated by an electrode plate lower clearance groove 3141 formed at the lower left end of the PTC mounting cavity rear partition plate 314 and an electrode plate upper clearance groove 3142 formed at the upper left end of the PTC mounting cavity rear partition plate 314. The PTC mounting cavity 311 is connected to the current control mechanism cavity 312. The PTC mounting cavity 311 and the starting capacitor electrical connection foot cavity 313 are separated by the front sidewall 315 of the PTC mounting cavity. The electrode plate insertion relief groove 3151 opened on the upper left end of the front sidewall 315 of the PTC mounting cavity connects the PTC mounting cavity 311 and the starting capacitor electrical connection foot cavity 313. The first PTC I 33 is inserted horizontally at the front end of the PTC mounting cavity 311. The second PTC II 34 corresponds to the rear side of the first PTC I 33 and is also inserted horizontally at the rear end of the PTC mounting cavity 311. A PTC separation gap 37 is maintained between the first PTC I 33 and the second PTC II 34. The rear end of the first electrode plate I 35 extends into the current control mechanism cavity 312 through the relief groove 3142 on the electrode plate and forms a thyristor-controlled PTC electrical contact elastic foot 353. Figure 2(As shown), the thyristor controls the PTC electrical contact elastic foot 353 to make electrical contact with the current control mechanism 2 disposed in the current control mechanism cavity 312. A first PTC upper electrical contact elastic foot 1351 is formed at the middle of the first electrode plate I 35 at a position corresponding to the first PTC I 33, and a second PTC upper electrical contact elastic foot II 352 is formed at a position corresponding to the second PTC II 34. The first PTC upper electrical contact elastic foot 1351 makes electrical contact with the upper side of the first PTC I 33, and the second PTC upper electrical contact elastic foot II 352 makes electrical contact with the upper side of the second PTC II 34. The front end of the first electrode plate I 35 extends through the aforementioned electrode plate insertion recess 3151 to the aforementioned starting capacitor electrical connection. The foot cavity 313 contains an actuator capacitor electrical connection foot 354. The rear end of the second electrode plate II 36 extends into the current control mechanism cavity 312 through the aforementioned electrode plate lower relief groove 3141 and forms a bidirectional thyristor electrical contact holding foot 361. In the middle of the second electrode plate II 36, a first PTC lower electrical contact elastic foot I 362 is formed at the position corresponding to the first PTC I 33, and a second PTC lower electrical contact elastic foot II 363 is formed at the position corresponding to the second PTC II 34. The first PTC lower electrical contact elastic foot I 362 is in electrical contact with the lower side of the first PTC I 33, and the second PTC lower electrical contact elastic foot II 363 is in electrical contact with the lower side of the second PTC II 34.

[0022] See you later Figure 1 and Figure 2The aforementioned current control mechanism cavity 312 includes a bidirectional thyristor insertion cavity 3121 and a thyristor-controlled PTC insertion cavity 3122, which are interconnected. The aforementioned current control mechanism 2 includes a bidirectional thyristor 21, a thyristor-controlled PTC 22, a thyristor-controlled PTC electrical connection piece 23, and a bidirectional thyristor S-terminal electrical connection piece 24. The bidirectional thyristor 21 is inserted into the bidirectional thyristor insertion cavity 3121, and the thyristor-controlled PTC 22 is inserted into the thyristor-controlled PTC insertion cavity 3122. One end of the thyristor-controlled PTC electrical connection piece 23 is electrically connected to the first bidirectional thyristor pin 211 of the bidirectional thyristor 21, while the other end of the thyristor-controlled PTC electrical connection piece 23 extends to... The aforementioned thyristor-controlled PTC insertion cavity 3122 is electrically contacted with one side of the thyristor-controlled PTC 22. One end of the bidirectional thyristor S-terminal electrical connection piece 24 is electrically connected to the second pin 212 of the bidirectional thyristor 21, while the middle part of the bidirectional thyristor S-terminal electrical connection piece 24 extends out of the bidirectional thyristor insertion cavity 3121 and is fitted with the outer wall of the aforementioned starter housing 31. An S-terminal electrical connection foot 241 is formed at the other end of the bidirectional thyristor S-terminal electrical connection piece 24. The aforementioned bidirectional thyristor electrical contact holding foot 361 is electrically contacted with the third pin (not shown in the figure) of the bidirectional thyristor 21, and the aforementioned thyristor-controlled PTC electrical contact elastic foot 353 is electrically contacted with the other side of the aforementioned thyristor-controlled PTC 22.

[0023] A starter capacitor electrical connection foot fixing screw hole 3131 is provided on the right wall of the aforementioned starter capacitor electrical connection foot cavity 313, and a starter capacitor electrical connection foot fixing screw hole 3541 is provided on the aforementioned starter capacitor electrical connection foot 354. The starter capacitor electrical connection foot fixing screw 35411 passes through the starter capacitor electrical connection foot fixing screw hole 3541 and the starter capacitor electrical connection foot fixing screw hole 3131 in sequence, and is locked by a screw locking nut 35412 located in the nut cavity 316 on the front right side of the aforementioned starter housing 31 and screwed onto the starter capacitor electrical connection foot fixing screw 35411.

[0024] A starter housing cover 32 has a starter housing cover retaining foot 322 and a starter housing cover engaging cavity 323 on its upper surface. A pair of starter housing cover positioning feet 324 extend from the upper right side of the starter housing 32 toward the starter housing 31. A housing cover retaining foot groove 317a is formed on the left side of the upper surface of the starter housing 31, corresponding to the starter housing cover retaining foot 322. A starter housing cover engaging cavity mating flange 317b is formed at the position corresponding to the starter housing cover engaging cavity 323. A starter housing cover positioning foot limiting groove 3111 is formed on the right cavity wall of the PTC mounting cavity 311, corresponding to the position of each pair of starter housing cover positioning feet 324. Figure 2 As shown), the starter housing cover retaining foot 322 mates with the aforementioned housing cover retaining foot groove 317a, the starter housing cover engaging cavity engaging flange 317b mates with the aforementioned starter housing cover engaging cavity 323, and a pair of starter housing cover positioning feet 324 each mates with the starter housing cover positioning foot limiting groove 3111.

[0025] A pair of housing fixing grooves 321 are formed at the bottom of the aforementioned starter housing cover 32, and a pair of housing fixing groove fitting flanges 317c are formed on the bottom wall of the aforementioned starter housing 31 at positions corresponding to the pair of housing fixing grooves 321. The pair of housing fixing groove fitting flanges 317c fits into the pair of housing fixing grooves 321.

[0026] Still see Figure 1 and Figure 2 In the PTC mounting cavity 311 of the starter housing 31, an electrode support block 3112 is formed at intervals corresponding to the middle region of the first electrode plate I 35. An electrode limiting pressure block 3113 is formed at intervals corresponding to the middle region of the second electrode plate II 36. The left end of the electrode limiting pressure block 3113 facing downwards has an electrode slot 3114 that corresponds to and communicates with the lower relief groove 3141 of the electrode plate between the bottom wall of the PTC mounting cavity 311 and the electrode slot 3114. The middle region of the first electrode plate I 35 is supported on the electrode support block 3112. The middle region of the second electrode plate II 36 is inserted into the electrode slot 3114 and limited by the electrode limiting pressure block 3113.

[0027] On the right cavity wall of the aforementioned PTC mounting cavity 311, and at a position corresponding to the aforementioned first PTCⅠ33 and second PTCⅡ34, there is a PTC partition post 3115 extending to the left, which extends into the aforementioned PTC partition gap 37 between the aforementioned first PTCⅠ33 and second PTCⅡ34.

[0028] On the left side of the top wall at the rear end of the aforementioned starter housing 31, there is a bidirectional thyristor S-terminal electrical connection plate limiting plate 318. The space between the downward-facing side of the bidirectional thyristor S-terminal electrical connection plate limiting plate 318 and the top wall of the starter housing 31 forms an electrical connection plate slot 3181. The middle part of the aforementioned bidirectional thyristor S-terminal electrical connection plate 24 is inserted into the electrical connection plate slot 3181 after the aforementioned bidirectional thyristor insertion cavity 3121 is led out.

[0029] Please see Figure 3 An electrical junction box 1 is shown. To facilitate viewing the terminal block mechanism 11 located inside the electrical junction box 1 on the front side of the electrical junction box mounting bracket 5, the junction box cover has been removed. The aforementioned terminal block mechanism 11 includes a grounding terminal 111, a spare terminal 112, an M terminal 113, an L terminal 114, and an S terminal 115. This invention is... Figure 1 The motor starter assembly 3 shown is installed in the lower part of the electrical junction box cavity of the electrical junction box 1 in an insert manner, that is, below the S terminal 115. The S terminal electrical connection pin 241 of the bidirectional thyristor S terminal electrical connection piece 24 of the aforementioned current control mechanism 2 is electrically connected to the S terminal 115. The aforementioned starter capacitor electrical connection pin 354 is electrically connected to the first electrical connection line I41 of the refrigeration compressor starting capacitor 4. Specifically, the first electrical connection line I41 of the refrigeration compressor starting capacitor is fixed to the starter capacitor electrical connection pin 354 by means of the aforementioned starter capacitor electrical connection pin fixing screw 35411.

[0030] exist Figure 3 The diagram also shows a refrigeration compressor 7 and its three terminals 71, which have M, S, and L terminals. The second electrical connection line II 41 of the refrigeration compressor starting capacitor 4 is electrically connected to the M terminal 113. The refrigeration compressor running capacitor 6 has its first electrical connection line I 61 and second electrical connection line II 62 electrically connected to the M terminal 113 and S terminal 115, respectively. Figure 3 The diagram also shows the electrical connection between the refrigeration compressor 7 and the terminal block mechanism 11. Figure 3 The diagram also shows that the wiring cover fixing lug 12, which is located in the center of the upper part of the electrical junction box 1, is fixed to the electrical junction box mounting bracket 5 by the wiring box fixing lug screw 121, and that a pair of wiring box lower fixing lugs 13, which are located on both sides of the lower end of the electrical junction box 1, are fixed to the electrical junction box mounting bracket 5 by the wiring box lower fixing lug screw 131.

[0031] Based on the applicant's provided information Figure 3The electrical wiring connections are not confusing to those skilled in the art, and therefore the applicant will not elaborate further.

[0032] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

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