Phase sequence relay

Abstract

The utility model relates to the technical field of relays, in particular to a phase sequence relay. Comprising a shell which comprises a left side shell, a right side shell and a face shell; the circuit board is arranged in the shell, and a rotary potentiometer is arranged on the circuit board; the adjusting knob is arranged on the surface shell and is in linkage fit with the rotary potentiometer shaft; the wiring terminal comprises a pin, and the pin is connected with the circuit board in a matched mode; wherein the circuit board is provided with a connecting hole, the upper surface of the connecting hole is lower than the surface of the circuit board, the circuit board on the peripheral side of the connecting hole is provided with a filling hole for filling tin liquor, and the filling hole is conical; according to the utility model, through the arrangement of the conical filling holes, tin liquid can be easily filled and the pins are fixed, so that the welding of the pins is realized.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a phase sequence relay. Background Technology

[0002] In three-phase AC power systems, phase sequence relays play a crucial role. They detect the phase sequence of the three-phase power supply, ensuring that electrical equipment is connected to the power supply in the correct phase sequence, thereby preventing equipment damage or malfunctions caused by incorrect phase sequence. With the continuous improvement of industrial automation and the widespread application of electrical equipment, higher requirements are placed on the performance and reliability of phase sequence relays.

[0003] Existing phase sequence relays have several unresolved issues in structural design and manufacturing processes. The stability and reliability of the soldering process are particularly critical when connecting the terminal pins to the circuit board. Traditional circuit board connection methods typically place the connection holes flush with or above the circuit board surface. During soldering, it's difficult for the solder to fill the connection holes evenly and sufficiently, making it difficult to guarantee the soldering quality between the pins and the circuit board. This can easily lead to loosening and poor contact at the solder joints during long-term use due to vibration, current surges, and other factors. This can affect the normal operation of the phase sequence relay and may even cause electrical faults, threatening the stability and safety of the entire electrical system.

[0004] Therefore, there is an urgent need to provide an improved technical solution to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned technical problems by providing a phase sequence relay with higher quality terminal pin welding.

[0006] In view of this, the present invention provides a phase sequence relay, comprising:

[0007] The shell includes a left side shell, a right side shell, and a front shell;

[0008] The circuit board is housed inside the casing and has a rotary potentiometer on it.

[0009] The adjustment knob is located on the front cover and is linked to the rotary potentiometer shaft.

[0010] Terminal blocks, which include pins that mate with the circuit board for connection;

[0011] The circuit board has connection holes, the upper surface of which is lower than the surface of the circuit board. On the periphery of the connection holes, there are filling holes for filling with molten solder. The filling holes are tapered.

[0012] Furthermore, the inner wall of the filling hole is provided with a spiral groove.

[0013] Furthermore, it also includes:

[0014] A copper layer is applied to the inner surface of the filling hole.

[0015] Furthermore, the inner wall surface of the filling hole is a rough surface.

[0016] Furthermore, the texture of the rough surface is aligned axially.

[0017] Furthermore, the adjustment knob has a cross-shaped hole and a pointer hole at one end.

[0018] Furthermore, it also includes:

[0019] Two indicator lights are mounted on the front panel and are electrically connected to the circuit board.

[0020] Furthermore, the crust also includes:

[0021] Pre-drilled holes are used to install adjustment knobs, and a sealing layer is provided on the pre-drilled holes.

[0022] The beneficial effects of this utility model are:

[0023] 1. This utility model, through the setting of the conical filling hole, can help the molten solder to fill and fix the pins more easily, thereby realizing the soldering of the pins.

[0024] 2. This utility model has a spiral groove on the inner wall of the filling hole, which can increase the contact area between the liquid and the hole wall. The surface tension is used to guide the liquid spiral forward to the bottom of the hole, making it easier to fill the filling hole. In addition, the spiral groove in the filling hole can increase the limit between the solder block formed by the solder and the filling hole, making the solder block solder more tightly. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a side view of the structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the filling hole structure of this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the filling hole of this utility model.

[0029] The markings in the diagram are as follows:

[0030] 1. Left side shell; 2. Right side shell; 3. Front shell; 4. Circuit board; 5. Adjustment knob; 6. Terminal block; 7. Pin; 8. Connecting hole; 9. Filler hole; 10. Copper layer; 11. Cross hole; 12. Indicator light; 13. Reserved hole; 14. Sealing layer. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0032] Example 1:

[0033] This embodiment provides a phase sequence relay, including:

[0034] The shell includes a left shell 1, a right shell 2, and a front shell 3;

[0035] Circuit board 4 is disposed inside the housing and has a rotary potentiometer on it;

[0036] Adjustment knob 5 is located on the faceplate 3 and is linked to the rotating potentiometer shaft;

[0037] Terminal 6 includes pins 7, which are connected to circuit board 4.

[0038] The circuit board 4 has a connection hole 8, the upper surface of the connection hole 8 is lower than the surface of the circuit board 4, and a filling hole 9 for filling molten solder is provided on the periphery of the connection hole 8 on the circuit board 4. The filling hole 9 is conical.

[0039] The housing includes a left shell 1, a right shell 2, and a front shell 3. The left shell 1 and right shell 2 are fastened together, and the front end of the left shell 1 and right shell 2 is closed by the front shell 3. The front shell 3 has buckles on both sides, forming a groove that engages with the buckles after the left shell 1 and right shell 2 are fastened together. The circuit board 4 is located between the left shell 1 and right shell 2. Ribs for limiting the periphery of the circuit board 4 are provided inside the housing formed by the left shell 1 and right shell 2. A rotary potentiometer is provided on the circuit board 4. The rotary potentiometer can be used to adjust the sensitivity threshold of the phase sequence judgment. By changing the resistance value, the potentiometer adjusts the reference voltage of the comparator or the parameters of the phase shift circuit, so that the triggering condition of the relay matches the phase characteristics of the actual three-phase electricity. For example, in the positive sequence, the three-phase voltage lags by 120° in the order A→B→C. After the potentiometer is calibrated, the relay does not operate. If it is in the reverse sequence (A→C→B) or a phase is missing, the phase difference deviates from the reference value, and the relay triggers protection.

[0040] The adjustment knob 5 is rotatably connected to the faceplate 3, and a coupling rod is provided on the lower side of the adjustment knob 5. A coupling hole is provided on the rotary potentiometer to cooperate with the coupling rod. The shape of the coupling rod can be cross-shaped, hexagonal, etc. The wiring terminals 6 are provided on the top and bottom of the left and right side shells 2. Several wiring terminals 6 are provided as needed. The wiring terminals 6 include pins 7, which are electrically connected to the circuit board 4. The pins 7 are fixed to the circuit board 4 by soldering. The circuit board 4 has a connection hole 8, which is set on a conductive metal. The upper surface of the connection hole 8 is lower than the surface of the circuit board 4. A tapered filling hole 9 is provided on the circuit board 4 around the connection hole 8. The diameter of the top of the filling hole 9 is larger than the inner diameter of the bottom. During soldering, liquid solder is dripped into the filling hole 9. Through the tapered hole, the large inlet facilitates the rapid contact of liquid solder with the hole opening, reducing surface tension resistance. The small outlet end enhances capillary pressure, which can push the liquid deeper until the liquid solder surface is level with or higher than the surface of the circuit board 4, covering the entire connection hole 8.

[0041] The tapered filling hole 9 helps to fill and fix the pin 7 more easily, thus enabling the soldering of the pin 7.

[0042] Example 2:

[0043] This embodiment provides a phase sequence relay, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0044] The inner wall of filling hole 9 is provided with a spiral groove.

[0045] A spiral groove is provided on the inner wall of the filling hole 9, which can increase the contact area between the liquid and the hole wall. The surface tension is used to guide the liquid spiral forward to the bottom of the hole, making it easier to fill the filling hole 9. In addition, the spiral groove in the filling hole 9 can increase the limit between the tin block formed by the tin and the filling hole 9, making the tin block solder more tightly.

[0046] Also includes:

[0047] Copper layer 10 is disposed on the inner surface of the filling hole 9.

[0048] The wettability of liquid tin (such as Sn-Pb or lead-free solder) to metallic materials is ranked as follows: copper > nickel > iron > ceramic. Applying a copper plating to the hole wall can reduce the contact angle θ from >90° (non-wetting) to <60° (good wetting), significantly enhancing capillary action. The smaller the contact angle, the larger the cosθ, increasing the numerator in the capillary pressure formula and promoting liquid entry.

[0049] The inner wall surface of the filling hole 9 is a rough surface.

[0050] When there are micron-sized grooves or protrusions on the surface of the hole wall, it is equivalent to forming countless tiny capillary channels within the main hole, superimposed with capillary pressure. For example, by using sandblasting or etching processes to achieve a hole wall roughness Ra of 1 to 5 microns, the penetration rate of liquid tin can be increased.

[0051] Note: Excessive roughness (Ra > 10 micrometers) will increase the resistance to liquid flow and hinder penetration. Roughness should be controlled within a reasonable range.

[0052] The texture of a rough surface is aligned axially.

[0053] The texture of the hole wall is arranged along the axial direction (from the hole opening to the bottom of the hole), which can guide the liquid tin to slide along the texture direction, reducing lateral resistance, similar to the effect of "groove drainage".

[0054] The adjustment knob 5 has a cross hole 11 and a pointer hole at one end.

[0055] The cross-shaped hole 11 needs to be turned with a tool with a cross blade, such as a Phillips screwdriver; this effectively prevents unauthorized personnel from turning it, and the pointer hole is integrally formed with the cross-shaped hole 11, simplifying the production process.

[0056] Also includes:

[0057] Two indicator lights 12 are mounted on the front cover 3 and are electrically connected to the circuit board 4.

[0058] Two indicator lights 12 are used to indicate different states of the phase sequence relay, and are composed of lights of different colors.

[0059] The faceplate 3 also includes:

[0060] A pre-drilled hole 13 is provided for installing the adjustment knob 5, and a sealing layer 14 is provided on the pre-drilled hole 13.

[0061] Adjustment knob 5 for mounting multiple settings.

[0062] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms fall within the scope of protection of this application.

Claims

1. A phase sequence relay, characterized in that, include: The shell includes a left shell (1), a right shell (2) and a front shell (3); Circuit board (4), the circuit board (4) is disposed inside the housing, and a rotary potentiometer is provided on the circuit board (4); Adjustment knob (5) is set on the faceplate (3) and is linked to the rotating potentiometer shaft; The terminal block (6) includes pins (7), which are connected to the circuit board (4). The circuit board (4) is provided with a connection hole (8), the upper surface of the connection hole (8) is lower than the surface of the circuit board (4), and a filling hole (9) for filling molten solder is provided on the circuit board (4) around the connection hole (8), and the filling hole (9) is conical.

2. A phase sequence relay according to claim 1, characterized in that, The inner wall of the filling hole (9) is provided with a spiral groove.

3. A phase sequence relay according to claim 1, characterized in that, Also includes: A copper layer (10) is disposed on the inner surface of the filling hole (9).

4. A phase sequence relay according to claim 1, characterized in that, The inner wall surface of the filling hole (9) is a rough surface.

5. A phase sequence relay according to claim 4, characterized in that, The texture of a rough surface is aligned axially.

6. A phase sequence relay according to claim 1, characterized in that, The adjustment knob (5) has a cross hole (11) and a pointer hole at one end.

7. A phase sequence relay according to claim 1, characterized in that, Also includes: Two indicator lights (12) are set on the front cover (3) and electrically connected to the circuit board (4).

8. A phase sequence relay according to claim 1, characterized in that, The face shell (3) also includes: A pre-drilled hole (13) is provided for installing the adjustment knob (5), and a sealing layer (14) is provided on the pre-drilled hole (13).

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