A PTC starter with a safety structure and its installation method

Abstract

The present invention discloses a PTC starter with a safety structure and an installation method thereof. The PTC starter with the safety structure includes a PTC chip, and an elastic sheet, a first electrode plate, a second electrode plate, a metal connecting sheet, a compressor running winding terminal M, and a compressor starting winding terminal S that are connected to the PTC chip. The PTC chip of the PTC starter is arranged deviating from the area between the compressor running winding terminal M and the compressor starting winding terminal S; alternatively, the PTC chip, the first electrode plate, and the second electrode plate are all horizontally arranged away from the compressor running winding terminal M and the compressor starting winding terminal S. When the PTC chip fails and burns, it will not cause the glass body of the terminal post to be heated and melted, preventing the risk of leakage and combustion of the combustible refrigerant inside the compressor.

Description

Technical Field

[0001] The present invention relates to a compressor starter, specifically a PTC starter with a safety structure. Background Art

[0002] The PTC starter is essentially a typical semiconductor resistor with temperature sensitivity. When the temperature exceeds a certain value (Curie temperature), its resistance value increases step by step with the increase of temperature. The PTC starter is directly connected in series with the secondary winding (starting winding) of the motor and then connected in parallel with the main winding of the motor. When the compressor starts, the temperature of the PTC element is relatively low and the resistance is small, which can be approximated as a direct-through circuit and the motor runs normally. When the starting current increases to 4-6 times the normal running current, the large current causes the temperature of the element to rise rapidly. Since the PTC starter becomes a high-resistance state, the starting circuit is close to being disconnected and the motor starting is completed.

[0003] For the existing starters, as shown in the attached Figure 1 After being assembled on the compressor, the PTC chip 2 is located below the terminal 7, and the distance between the PTC chip 2 and the vitreous body 6 of the terminal 7 is very close, and the contact area is large. One of the failure modes of the ceramic PTC chip is combustion, and at the same time, high temperature is generated. The temperature at this time exceeds 1500°C. Once this failure mode occurs, it will cause the vitreous body 6 of the terminal 7 to melt, and the internal combustible refrigerant will leak and burn, resulting in greater risks.

[0004] The Chinese patent document with the publication number CN208623492U discloses a compressor PTC starter on March 19, 2019. By setting an elastic sheet and elastic electrodes, a fixed acting force is applied to the PTC chip. When the PTC chip fails and breaks, due to the elastic restoring force of the elastic electrode, the elastic electrode of the second electrode plate pushes the broken PTC chip away from the middle to prevent the circuit from short-circuiting. However, the PTC chip is located between the running winding terminal M and the starting winding terminal S of the compressor and the distance is relatively close. When the temperature of the PTC chip is relatively high, there is a risk of the vitreous body of the terminal being heated and melted.

[0005] The Chinese patent document with the publication number CN203770105U discloses a starter assembly for a refrigerator on August 13, 2014. By setting a main control board to freely control the on-off of the starter and the auxiliary winding of the compressor, it is avoided that the starter is always powered on during the compressor startup process, and the system short-circuit problem caused by the chip breaking due to the overheating of the starter can be avoided, the energy consumption of the refrigerator can be reduced, and the reliability of the starter can be improved. However, both the main winding terminal M and the auxiliary winding terminal S of the compressor are directly connected to the PTC chip. When the temperature of the PTC chip is relatively high, there is a risk of the vitreous body of the terminal being heated and melted. Summary of the Invention

[0006] The object of the present invention is to provide a PTC starter with a safety structure and its installation method in view of the problems existing in the prior art. The purpose is that when the PTC chip fails and burns, it will not cause the glass body of the terminal post to be heated and melted, and prevent the risk of leakage and combustion of the combustible refrigerant inside the compressor.

[0007] According to the first aspect of the embodiment of the present invention, a PTC starter with a safety structure is provided, which includes a PTC chip, and an elastic sheet, a first electrode plate, a second electrode plate, a metal connection sheet, a compressor running winding terminal M and a compressor starting winding terminal S connected to the PTC chip; characterized in that, the PTC chip is disposed deviating from the area between the compressor running winding terminal M and the compressor starting winding terminal S; or, the PTC chip and the first electrode plate and the second electrode plate are both horizontally disposed away from the compressor running winding terminal M and the compressor starting winding terminal S.

[0008] Further, the first electrode plate and the second electrode plate are symmetrically and parallelly disposed on the front and back sides of the PTC chip, and are fixedly connected to the PTC chip through a plurality of the elastic sheets.

[0009] Further, the compressor running winding terminal M and the compressor starting winding terminal S are respectively connected to the first electrode plate and the second electrode plate through the metal connection sheet.

[0010] Preferably, the plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is parallel to the plane where the PTC chip is located, and the two planes are respectively located in the upper part and the lower part inside the box body of the PTC starter;

[0011] The metal connection sheet is in a straight sheet shape, the upper end of the metal connection sheet is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower end of the metal connection sheet is connected to the first electrode plate or the second electrode plate.

[0012] Preferably, the plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is in the left part inside the box body of the PTC starter, and the plane where the PTC chip is located is in the right part inside the box body of the PTC starter;

[0013] The metal connection sheet is in an L-shaped bent shape, the upper left end of the metal connection sheet is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower right end of the metal connection sheet is connected to the first electrode plate or the second electrode plate.

[0014] Preferably, the plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is to the right inside the box body of the PTC starter, and the plane where the PTC chip is located is to the left inside the box body of the PTC starter;

[0015] The metal connecting piece is bent in an inverted L shape. The upper right end of the metal connecting piece is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower left end of the metal connecting piece is connected to the first electrode plate or the second electrode plate.

[0016] According to the second aspect of the embodiments of the present invention, a method for installing a PTC starter with a safety structure is provided. The installation method includes the following steps:

[0017] Step 1: Provide a plastic box body. The upper part of the box body is provided with a first jack and a second jack, and a long groove is arranged on the bottom plate of the lower part of the box body; the compressor running winding terminal M and the compressor starting winding terminal S are respectively arranged at the positions of the bottom plate of the box body corresponding to the first jack and the second jack, wherein the groove is arranged horizontally or deviates from the center of the box body;

[0018] Step 2: Place the PTC chip into the groove in a direction perpendicular to the bottom plate, so that the PTC chip is arranged horizontally or deviates from the center of the box body;

[0019] Step 3: Symmetrically and parallelly arrange the first electrode plate and the second electrode plate on the front and back sides of the PTC chip; install a plurality of elastic sheets on the front and back sides of the PTC chip and abut and fix them to the first electrode plate or the second electrode plate; the PTC chip is suspended and does not contact the box body to prevent the plastic box body from burning due to high temperature;

[0020] Step 4: Install a metal connecting piece on the bottom plate of the box body. One end of the metal connecting piece is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the other end of the metal connecting piece is connected to the first electrode plate or the second electrode plate. Among them, the metal connecting piece is linear, bent or curved; the metal connecting piece connects the compressor running winding terminal M to the first electrode plate and the compressor starting winding terminal S to the second electrode plate respectively to form a conductive path.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] By offsetting the PTC chip, the PTC chip is far away from the compressor running winding terminal M and the compressor starting winding terminal S. When the PTC chip fails and burns, it will not cause the glass body of the terminal to melt due to heat, preventing the risk of leakage and combustion of the combustible refrigerant inside the compressor. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the relative structural positions of the connection terminals of an existing starter;

[0024] Figure 2 It is a schematic diagram of the structure of a PTC starter with a safety structure according to the first embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of a PTC starter with a safety structure according to the second embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of a PTC starter with a safety structure according to the third embodiment of the present invention;

[0027] Figure 5 It is an installation schematic diagram of a PTC starter with a safety structure according to the fourth embodiment of the present invention;

[0028] In the figure: 1, box body; 2, PTC chip; 3, metal connection piece; M, compressor running winding terminal M; S, compressor starting winding terminal S; 4-1, first electrode plate; 4-2, second electrode plate; 5, elastic piece; 6, glass body; 7, terminal; 8, first jack; 9, second jack; 10, groove. Detailed Description of the Invention

[0029] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work conditions belong to the scope of protection of the present invention.

[0030] As Figure 2-4 shown, the PTC starter with a safety structure according to the present invention includes a PTC chip 2, and an elastic piece 5, a first electrode plate 4-1, a second electrode plate 4-2, a metal connection piece 3, a compressor running winding terminal M, and a compressor starting winding terminal S connected to the PTC chip 2.

[0031] Specifically, the PTC chip 2 is disposed deviating from the area between the compressor running winding terminal M and the compressor starting winding terminal S; or, the PTC chip 2 is disposed horizontally away from the compressor running winding terminal M and the compressor starting winding terminal S with both the first electrode plate 4-1 and the second electrode plate 4-2.

[0032] Furthermore, the first electrode plate 4-1 and the second electrode plate 4-2 are symmetrically and parallelly arranged on the front and back sides of the PTC chip 2, and are fixedly connected to the PTC chip 2 through a plurality of elastic sheets 5; the compressor running winding terminal M and the compressor starting winding terminal S are respectively connected to the first electrode plate 4-1 and the second electrode plate 4-2 through a metal connecting piece 3.

[0033] By offsetting the PTC chip 2 so that the PTC chip 2 is far away from the compressor running winding terminal M and the compressor starting winding terminal S, when the PTC chip 2 fails and burns, it will not cause the vitreous body of the terminal post to be heated and melted, preventing the risk of leakage and combustion of the combustible refrigerant inside the compressor.

[0034] Embodiment 1

[0035] As Figure 2 is a schematic structural diagram of the PTC starter with the safety structure of Embodiment 1 of the present invention. The plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is parallel to the plane where the PTC chip 2 is located, and the two planes are respectively located in the upper and lower parts inside the box body 1 of the PTC starter;

[0036] The metal connecting piece 3 is in a straight sheet shape. The upper end of the metal connecting piece 3 is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower end of the metal connecting piece 3 is connected to the first electrode plate 4-1 or the second electrode plate 4-2.

[0037] Embodiment 2

[0038] As Figure 3 is a schematic structural diagram of the PTC starter with the safety structure of Embodiment 2 of the present invention. The plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is located on the left side inside the box body 1 of the PTC starter, and the plane where the PTC chip 2 is located is located on the right side inside the box body 1 of the PTC starter;

[0039] The metal connecting piece 3 is in an L-shaped bent shape. The upper left end of the metal connecting piece 3 is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower right end of the metal connecting piece 3 is connected to the first electrode plate 4-1 or the second electrode plate 4-2.

[0040] Embodiment 3

[0041] As Figure 4 is a schematic structural diagram of the PTC starter with the safety structure of Embodiment 3 of the present invention. The plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is located on the right side inside the box body 1 of the PTC starter, and the plane where the PTC chip 2 is located is located on the left side inside the box body 1 of the PTC starter;

[0042] The metal connecting piece 3 is bent in an inverted L shape. The upper right end of the metal connecting piece 3 is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the lower left end of the metal connecting piece 3 is connected to the first electrode plate 4-1 or the second electrode plate 4-2.

[0043] Embodiment 4

[0044] Figure 5 The figure is a schematic installation diagram of the PTC starter with the safety structure according to Embodiment 4 of the present invention. According to the installation method of the PTC starter with the safety structure of the present invention, the following steps are included:

[0045] Step 1: Provide a plastic box body 1. The upper part of the box body 1 is provided with a first jack 8 and a second jack 9, and a long groove 10 is horizontally arranged on the bottom plate of the lower part of the box body 1; the compressor running winding terminal M and the compressor starting winding terminal S are respectively arranged at the positions of the bottom plate of the box body 1 corresponding to the first jack 8 and the second jack 9, wherein the groove is horizontally arranged or is arranged deviating from the center of the box body 1;

[0046] Step 2: Place the PTC chip 2 into the groove 10 in a direction perpendicular to the bottom plate, so that the PTC chip 2 is horizontally arranged or is arranged deviating from the center of the box body 1;

[0047] Step 3: Symmetrically and parallelly arrange the first electrode plate 4-1 and the second electrode plate 4-2 on the front and back sides of the PTC chip 2; install a plurality of elastic sheets 5 on the front and back sides of the PTC chip 2 and abut and fix them to the first electrode plate 4-1 or the second electrode plate 4-2; the PTC chip 2 is suspended and does not contact the box body 1 to prevent the plastic box body 1 from burning due to high temperature;

[0048] Step 4: Install the metal connecting piece 3 on the bottom plate of the box body. One end of the metal connecting piece 3 is connected to the compressor running winding terminal M or the compressor starting winding terminal S, and the other end of the metal connecting piece 3 is connected to the first electrode plate 4-1 or the second electrode plate 4-2. Among them, the metal connecting piece 3 is linear, bent or curved; the metal connecting piece 3 respectively connects the compressor running winding terminal M to the first electrode plate 4-1 and the compressor starting winding terminal S to the second electrode plate 4-2 to form a conductive path.

[0049] During actual use, the PTC starter with the safety structure of the embodiment of the present invention is connected to the compressor through a connecting column. The compressor running winding terminal M and the compressor starting winding terminal S are respectively connected to the glass body of the connecting column. By offsetting the PTC chip 2, the PTC chip 2 is far away from the compressor running winding terminal M and the compressor starting winding terminal S. When the PTC chip 2 fails and burns, it will not cause the glass body of the wiring column to melt due to heat, preventing the risk of leakage and combustion of the combustible refrigerant inside the compressor.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PTC starter with a safety structure, comprising a PTC chip, an elastic sheet, a first electrode plate, a second electrode plate, a metal connecting sheet, a compressor running winding terminal M and a compressor starting winding terminal S which are connected to the PTC chip; characterized in that , The PTC chip is disposed deviating from the area between the compressor running winding terminal M and the compressor starting winding terminal S, so that the PTC chip is far away from the compressor running winding terminal M and the compressor starting winding terminal S. When the PTC chip fails and burns, it will not cause the terminal post vitreous body to be heated and melted, preventing the risk of leakage and combustion of combustible refrigerant inside the compressor; The first electrode plate and the second electrode plate are symmetrically and parallelly disposed on the front and back sides of the PTC chip. The PTC chip is suspended by a plurality of elastic sheets and does not contact the box body; The plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is parallel to the plane where the PTC chip is located, and the two planes are respectively located in the upper and lower parts inside the box body of the PTC starter; The metal connecting piece is in a straight sheet shape. There are two metal connecting pieces. The upper end of one metal connecting piece is connected to the compressor running winding terminal M, and the lower end is connected to the first electrode plate; the upper end of the other metal connecting piece is connected to the compressor starting winding terminal S, and the lower end is connected to the second electrode plate, forming a conductive path.

2. A PTC starter with a safety structure, comprising a PTC chip, an elastic sheet, a first electrode plate, a second electrode plate, a metal connection sheet, a compressor running winding terminal M and a compressor starting winding terminal S connected to the PTC chip; characterized in that , The PTC chip and the first electrode plate and the second electrode plate are all horizontally disposed away from the compressor running winding terminal M and the compressor starting winding terminal S, so that the PTC chip is far away from the compressor running winding terminal M and the compressor starting winding terminal S. When the PTC chip fails and burns, it will not cause the terminal post vitreous body to be heated and melted, preventing the risk of leakage and combustion of combustible refrigerant inside the compressor; The first electrode plate and the second electrode plate are symmetrically and parallelly disposed on the front and back sides of the PTC chip. The PTC chip is suspended by a plurality of elastic sheets and does not contact the box body; The plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is in the left part inside the box body of the PTC starter, and the plane where the PTC chip is located is in the right part inside the box body of the PTC starter. Or, the plane where the connection area between the compressor running winding terminal M and the compressor starting winding terminal S is located is in the right part inside the box body of the PTC starter, and the plane where the PTC chip is located is in the left part inside the box body of the PTC starter; When the metal connecting piece is in an L-shaped bent shape, there are two metal connecting pieces. The upper left end of one metal connecting piece is connected to the compressor running winding terminal M, and the lower right end is connected to the first electrode plate; the upper left end of the other metal connecting piece is connected to the compressor starting winding terminal S, and the lower right end is connected to the second electrode plate, forming a conductive path; When the metal connecting piece is in an inverted L-shaped bent shape, there are two metal connecting pieces. The upper right end of one metal connecting piece is connected to the compressor running winding terminal M, and the lower left end is connected to the first electrode plate; the upper right end of the other metal connecting piece is connected to the compressor starting winding terminal S, and the lower left end is connected to the second electrode plate, forming a conductive path.

3. A method for installing a PTC starter with the safety structure as claimed in claim 1, characterized in that , The installation method includes the following steps: Step 1: Provide a plastic box body. The upper part of the box body is provided with a first jack and a second jack, and a long groove is arranged on the bottom plate of the lower part of the box body; arrange the compressor running winding terminal M and the compressor starting winding terminal S at the positions of the bottom plate of the box body corresponding to the first jack and the second jack respectively, wherein the long groove is arranged horizontally; Step 2: Place the PTC chip into the long groove in a direction perpendicular to the bottom plate so that the PTC chip is arranged horizontally; Step 3: Symmetrically and parallelly arrange the first electrode plate and the second electrode plate on the front and back sides of the PTC chip; install a plurality of elastic sheets on the front and back sides of the PTC chip and fix them against the first electrode plate or the second electrode plate; Step 4: Install two metal connecting pieces on the bottom plate of the box body. The upper end of one of the metal connecting pieces is connected to the compressor running winding terminal M, and the lower end is connected to the first electrode plate; the upper end of the other metal connecting piece is connected to the compressor starting winding terminal S or the lower end is connected to the second electrode plate; wherein, the metal connecting piece is in a straight sheet shape.

4. An installation method of a PTC starter with the safety structure as claimed in claim 2, characterized in that , the installation method includes the following steps: Step 1: Provide a plastic box body. The upper part of the box body is provided with a first jack and a second jack, and a long groove is arranged on the bottom plate of the lower part of the box body; arrange the compressor running winding terminal M and the compressor starting winding terminal S at the positions of the bottom plate of the box body corresponding to the first jack and the second jack respectively, and the long groove is arranged deviating from the center of the box body; Step 2: Place the PTC chip into the long groove in a direction perpendicular to the bottom plate so that the PTC chip is arranged deviating from the center of the box body; Step 3: Symmetrically and parallelly arrange the first electrode plate and the second electrode plate on the front and back sides of the PTC chip; install a plurality of elastic sheets on the front and back sides of the PTC chip and fix them against the first electrode plate or the second electrode plate; Step 4: Install two metal connecting pieces on the bottom plate of the box body. The upper end of one of the metal connecting pieces is connected to the compressor running winding terminal M, and the lower end is connected to the first electrode plate; the upper end of the other metal connecting piece is connected to the compressor starting winding terminal S, and the lower end is connected to the second electrode plate; wherein, the metal connecting piece is in an L-shaped bent shape or an inverted L-shaped bent shape.

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