A canned pump single-phase motor thyristor starter module

Abstract

The present invention is applicable to the technical field of motor starters, and provides a thyristor starter module for a single-phase motor of a shielded pump, comprising a thyristor starter electrically connected to the single-phase motor of the shielded pump; a starting winding and a running winding connected in parallel are arranged inside the single-phase motor of the shielded pump; a power supply output resistor is connected in series with the starting winding; the thyristor starter comprises a thyristor, a bimetallic electrostrictive blade delay switch and a heating resistor; the current output resistor is electrically connected to the bimetallic electrostrictive blade delay switch through a heating resistor. Compared with traditional resistor phase-splitting starting, capacitor starting, centrifugal switch and other starting methods, the device has a smaller size, stronger stability, larger starting torque, and is not subject to temperature restrictions. It breaks through the traditional use of capacitors for single-phase motors of submerged shielded pumps, and devices such as centrifugal switches or PTC starters can also enable submerged shielded pumps to achieve efficient starting and operation.

Description

Technical Field

[0001] The invention relates to the technical field of motor starters, and more specifically to a canned pump single-phase motor thyristor starter module. Background Art

[0002] The drive of an ordinary centrifugal pump is to connect the impeller shaft of the pump with the electric shaft through a coupling, so that the impeller rotates together with the motor to work. The shielded pump is a seal-free pump. The pump and the drive motor are sealed in a pressure vessel filled with the pumping medium. This pressure vessel has only static seals and a wire group to provide a rotating magnetic field and drive the rotor. This structure eliminates the rotating shaft sealing device of the traditional centrifugal pump, so it can be completely leak-free.

[0003] Due to the overall sealing problem of the submersible shielded pump, the running capacitor and the starting capacitor of the single-phase motor of the submersible shielded pump in the prior art are connected in parallel to the starting winding and then directly encapsulated in the stator cavity. When the running capacitor or the starting capacitor is damaged, it means that the entire submersible shielded pump is scrapped. The running capacitor and the starting capacitor cannot be disassembled and replaced separately, which reduces the service life of the submersible shielded pump. At the same time, the capacitor is large in size, and the size of the single-phase motor of the submersible shielded pump needs to be added to the size of the capacitor, which increases the occupied space. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a thyristor starter module for a single-phase motor of a shielded pump. Compared with traditional starters such as resistor phase starting, capacitor starting, and centrifugal switch starting, the module has a smaller size, stronger stability, a larger starting torque, and is not subject to temperature restrictions. It breaks through the traditional use of capacitors for single-phase motors of submersible shielded pumps. Devices such as centrifugal switches or PTC starters can also enable submersible shielded pumps to achieve efficient starting and operation.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A canned pump single-phase motor thyristor starter module, comprising a thyristor starter electrically connected to the canned pump single-phase motor; the canned pump single-phase motor power access end is electrically connected to the L line and the N line respectively; the canned pump single-phase motor is provided with a starting winding and a running winding connected in parallel; the starting winding is connected in series with a power output resistor; the starting winding is connected in series with the thyristor starter; the thyristor starter comprises a thyristor, a bimetallic electrostrictive blade delay switch and a heating resistor; the bottom of the thyristor is provided with a thyristor Gate, a thyristor T1 end and a thyristor T2 end in sequence; the current output resistor is electrically connected to the bimetallic electrostrictive blade delay switch through a heating resistor.

[0007] The present invention is further configured as follows: the L line is electrically connected to a thermistor which is respectively connected in series with the running winding and the starting winding; the L line is electrically connected to the N line through the running winding; the L line and the N line are electrically connected through a thyristor starter.

[0008] The present invention is further configured as follows: the thyristor starter also includes a sealing cover and a metal sheet metal sleeve that are plugged into each other; a retaining frame is plugged into the bottom of the metal sheet metal sleeve; a first installation cavity group that is compatible with the thyristor Gate, the thyristor T1 end and the thyristor T2 end is opened on the surface of the retaining frame.

[0009] The present invention is further configured as follows: the bimetallic electrostrictive blade delay switch includes a first plug-in plate, a second plug-in plate and a thermal expansion contact respectively plugged into a retaining frame; the retaining frame is respectively provided with a second installation cavity group, a third installation cavity group and a fourth installation cavity group which are compatible with the first plug-in plate, the second plug-in plate and the thermal expansion contact.

[0010] The present invention is further configured as follows: the first plug-in piece is a first conductive copper galvanized connecting piece; the second plug-in piece is composed of a second conductive copper galvanized connecting piece and a bimetallic static contact that are fixedly connected to each other; the thermal expansion contact is composed of a third conductive copper galvanized connecting piece and a bimetallic dynamic contact.

[0011] The present invention is further configured as follows: a plurality of rubber handles are fixedly disposed in a circular array on the outer peripheral side of the sealing cover; a first annular sealing groove is provided on the outer peripheral side of the sealing cover near its bottom; a second annular sealing groove is provided on the outer peripheral side of the metal sheet metal sleeve; an elastic rubber ring is sleeved on the metal sheet metal sleeve; two groups of annular rubber sealing ribs are provided on the inner peripheral side of the elastic rubber ring from top to bottom, which are respectively matched with the first annular sealing groove and the second annular sealing groove; a plurality of anti-slip grooves are provided on the outer peripheral side of the elastic rubber ring and the outer peripheral side of the rubber handle.

[0012] The present invention is further configured as follows: a sleeve is symmetrically fixed on the outer peripheral side surface of the metal sheet metal sleeve near its bottom; the retaining frame is made of plastic material, and a U-shaped seat with a hollow structure inside is symmetrically fixed on the outer peripheral side surface; an ear rod is fixed to the inner wall of the U-shaped seat; and an inserting portion that is slidably provided on the ear rod and is plugged into and matched with the inner wall of the sleeve.

[0013] The present invention is further configured as follows: a slot is provided on the inner wall of the sleeve; the plug-in portion includes a support plate that slides with the inner wall of the sleeve; a guide hole that slides with the ear rod is provided on the side of the support plate; an extrusion spring that is sleeved on the ear rod is fixedly connected between the support plate and the inner wall of the U-shaped seat; an insertion block that plugs with the slot is fixed on the side of the support plate near the top; and a curved panel is fixed on the side of the support plate.

[0014] The advantages of the present invention are:

[0015] 1. Compared with traditional starters such as resistor split-phase starter, capacitor starter, centrifugal switch starter, etc., the starter module of the present invention has a smaller size, stronger stability, larger starting torque, and is not subject to temperature restrictions. It breaks through the traditional use of capacitors for single-phase motors of submersible shielded pumps. Devices such as centrifugal switches or PTC starters can also enable submersible shielded pumps to achieve efficient starting and operation.

[0016] 2. The volume of the thyristor starter of the present invention is smaller than that of the traditional capacitor, and can be installed in an external seal. It can be easily plugged in and out by hand, which is convenient for maintenance and replacement. Under the condition that the performance of the underwater shielded pump is consistent, the overall size of the underwater shielded pump can be greatly compressed, reducing the occupied space. The stability and sealing of the connection between the sealing cover and the metal sheet metal sleeve are improved by setting the elastic rubber ring. The stability of the connection between the metal sheet metal sleeve and the retaining frame is improved by setting the plug-in part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a circuit control diagram of a single-phase motor thyristor starter module for a shielded pump.

[0018] Figure 2 For the present invention Figure 1 Partial enlargement.

[0019] Figure 3 It is a structural schematic diagram of the thyristor starter of the present invention.

[0020] Figure 4 It is a schematic diagram of the explosion structure of the thyristor starter of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the sealing cover of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the metal sheet metal sleeve of the present invention.

[0023] Figure 7 It is a schematic structural diagram of the retaining frame of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the elastic rubber ring of the present invention.

[0025] Fig. 9 It is a schematic diagram of the exploded structure of the thyristor, bimetallic electrostrictive blade delay switch and retainer assembly of the present invention.

[0026] In the figure: 1. thyristor starter; 2. thyristor; 3. thyristor Gate; 4. thyristor T1 end; 5. thyristor T2 end; 6. sealing cover; 7. metal sheet metal sleeve; 8. retaining frame; 9. first installation cavity group; 10. second installation cavity group; 11. third installation cavity group; 12. fourth installation cavity group; 13. second conductive copper galvanized connecting piece; 14. bimetallic static contact; 15. third conductive copper galvanized connecting piece; 16. Bimetallic dynamic contact; 17. Rubber handle; 18. Second annular sealing groove; 19. Elastic rubber ring; 20. First annular sealing groove; 21. Shaped rubber sealing rib; 22. Anti-slip pattern; 23. Sleeve; 24. U-shaped seat; 25. Ear rod; 26. Plug-in part; 27. Slot; 28. Support plate; 29. ​​Guide hole; 30. Extrusion spring; 31. Insert block; 32. First conductive copper galvanized connecting piece; 33. Curved plate. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0030] For example, see Figure 1-9 , the present invention provides the following technical solutions:

[0031] A canned pump single-phase motor thyristor starter module, specifically, comprises a thyristor starter 1 electrically connected to the canned pump single-phase motor; the canned pump single-phase motor power access end is electrically connected to the L line and the N line respectively; the canned pump single-phase motor is provided with a starting winding and a running winding connected in parallel with each other; the starting winding is connected in series with a power output resistor; the starting winding is connected in series with the thyristor starter 1; the thyristor starter 1 comprises a thyristor 2, a bimetallic electrostrictive blade delay switch and a heating resistor; the bottom of the thyristor 2 is provided with a thyristor Gate 3, a thyristor T1 terminal 4 and a thyristor T2 terminal 5 in sequence; the current output resistor is electrically connected to the bimetallic electrostrictive blade delay switch through the heating resistor.

[0032] The L line is electrically connected to a thermistor connected in series with the running winding and the starting winding respectively; the L line and the N line are electrically connected through the running winding; the L line and the N line are electrically connected through the thyristor starter 1; the thyristor starter 1 also includes a sealing cover 6 and a metal sheet metal sleeve 7 that are plugged in and matched with each other; a retaining frame 8 is plugged in the bottom of the metal sheet metal sleeve 7; the surface of the retaining frame 8 is provided with a first installation cavity group 9 that is compatible with the thyristor Gate 3, the thyristor T1 end 4 and the thyristor T2 end 5; the bimetallic electrostrictive blade delay switch includes The first plug-in sheet, the second plug-in sheet and the thermal expansion contact are respectively plugged in the retaining frame 8; the retaining frame 8 is respectively provided with a second installation cavity group 10, a third installation cavity group 11 and a fourth installation cavity group 12 which are adapted to the first plug-in sheet, the second plug-in sheet and the thermal expansion contact; the first plug-in sheet is a first conductive copper galvanized connecting sheet 32; the second plug-in sheet is composed of a second conductive copper galvanized connecting sheet 13 fixedly connected to each other and a bimetallic static contact 14; the thermal expansion contact is composed of a third conductive copper galvanized connecting sheet 15 and a bimetallic dynamic contact 16.

[0033] Working principle of the first embodiment:

[0034] The shielded pump single-phase motor winding of the present application has one more phase current output winding than the ordinary motor winding, which is used for heating and maintaining the temperature bimetallic electrostrictive blade delay switch in the thyristor starter 1. During normal operation, the output voltage is ≈1Vrms and the output current is 1.5A; when the motor winding is powered on and started, the thyristor Gate 3 in the starter is connected to the thyristor T2 terminal 5 through the normally closed contact of the temperature bimetallic electrostrictive blade delay switch. The thyristor T2 terminal 5 and the thyristor T1 terminal 4 are in the on state, the starting winding is energized, and the current passes through the starting winding, and the current flows from the thyristor T2 terminal 5 to the thyristor T1 terminal 4, and then reaches the power supply to form a current loop. The shielded pump single-phase motor starts to rotate. Since the starting winding has current passing through it, At this time, the starting current of the shielded pump single-phase motor is very large; when the shielded pump single-phase motor is started, the current output winding inside the shielded pump single-phase motor synchronously energizes the electrodes at both ends of the bimetallic electrostrictive blade in the thyristor starter 1, and the large current causes the temperature of the bimetallic dynamic contact 16 to continue to rise. In about 0.5s, the temperature on the bimetallic dynamic contact 16 reaches 70°C. At this time, the normally closed contact of the bimetallic electrostrictive blade delay switch is slowly disconnected, and the temperature of the bimetallic moving blade is maintained at 70°C. The thyristor Gate 3 is powered off, the thyristor T2 segment 5 and the thyristor T1 end 4 are cut off, and the starting winding is not energized. At this time, the starting of the submersible shielded pump single-phase motor is completed, and the shielded pump single-phase motor is in normal operation.

[0035] To sum up, due to the overall sealing problem of the submersible shielded pump, the capacitor of the single-phase motor of the submersible shielded pump was directly sealed in the stator cavity in the past. When the capacitor was damaged, it meant that the entire submersible shielded pump was scrapped, and the capacitor could not be disassembled and replaced individually. The thyristor starter module of the present application is smaller in size than the traditional capacitor, can be installed externally with a seal, and has a plug-in structure design, which is convenient for maintenance and replacement. While maintaining the performance of the submersible shielded pump, the overall size of the submersible shielded pump can be greatly compressed.

[0036] For example 2, please refer to Figure 1-9 The second embodiment is improved on the basis of the first embodiment as follows. Specifically, a plurality of rubber handles 17 are fixedly arranged in a circumferential array on the outer peripheral side of the sealing cover 6; a first annular sealing groove 20 is provided on the outer peripheral side of the sealing cover 6 near its bottom; a second annular sealing groove 18 is provided on the outer peripheral side of the metal sheet metal sleeve 7; an elastic rubber ring 19 is sleeved on the metal sheet metal sleeve 7; two groups of annular rubber sealing ribs 21 are provided on the inner peripheral side of the elastic rubber ring 19 from top to bottom, which are respectively matched with the first annular sealing groove 20 and the second annular sealing groove 18; a plurality of anti-slip grooves 22 are provided on the outer peripheral side of the elastic rubber ring 19 and the outer peripheral side of the rubber handle 17.

[0037] A sleeve 23 is symmetrically fixed on the outer peripheral side of the metal sheet metal sleeve 7 near its bottom; the retaining frame 8 is made of plastic, and a U-shaped seat 24 with a hollow structure inside is symmetrically fixed on its outer peripheral side; an ear rod 25 is fixed to the inner wall of the U-shaped seat 24; an inserting part 26 that is slidably provided on the ear rod 25 and is plugged into and matched with the inner wall of the sleeve 23.

[0038] A slot 27 is provided on the inner wall of the sleeve 23; the plug-in portion 26 includes a support plate 28 that slides with the inner wall of the sleeve 23; a guide hole 29 that slides with the ear rod 25 is provided on the side of the support plate 28; an extrusion spring 30 that is sleeved on the ear rod 25 is fixedly connected between the support plate 28 and the inner wall of the U-shaped seat 24; an insert block 31 that plugs with the slot 27 is fixed to the side of the support plate 28 near its top; a curved panel 33 is fixed to the side of the support plate 28.

[0039] Working principle of the second embodiment:

[0040] By installing the thyristor 2, the first plug-in plate, the second plug-in plate and the thermal expansion contact into the corresponding second installation cavity group 10, the third installation cavity group 11 and the fourth installation cavity group 12 in sequence, and then plugging the sealing cover 6 into the bottom of the metal sheet metal sleeve 7, during the plugging process, the curved panel 33 is pressed inward so that the support plate 28 slides along the ear rod 25 toward the direction close to the metal sheet metal sleeve 7, and the corresponding extrusion spring 30 is compressed, so that the support plate 28 can slide smoothly into the sleeve 23. After the plugging is completed, the hand pressing the curved panel 33 is released, and under the elastic reset force of the extrusion spring 30, the plug block 31 on the side of the support plate 28 is driven to be inserted into the slot 27 on the sleeve 23, completing the stable connection between the retaining frame 8 and the metal sheet metal sleeve 7.

[0041] Insert the sealing cover 6 into the top of the corresponding metal sheet metal sleeve 7, and then move the elastic rubber ring 19 to the corresponding position, so that the two groups of annular rubber sealing ribs 21 on the inner wall of the elastic rubber ring 19 enter the corresponding first annular sealing groove 20 and second annular sealing groove 18 respectively, to achieve a stable sealing connection between the sealing cover 6 and the metal sheet metal sleeve 7.

[0042] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A canned motor single-phase motor thyristor starter module, comprising a thyristor starter (1) electrically connected to the canned motor single-phase motor; characterized in that: The power supply access end of the canned pump single-phase motor is electrically connected to an L line and an N line respectively; a start winding and a running winding connected in parallel are arranged inside the canned pump single-phase motor; the start winding is connected in series with a power supply output resistor; the start winding is connected in series with a thyristor starter (1); The thyristor starter (1) comprises a thyristor (2), a bimetallic electrostrictive blade delay switch and a heating resistor; a thyristor Gate (3), a thyristor T1 terminal (4) and a thyristor T2 terminal (5) are sequentially arranged at the bottom of the thyristor (2); the current output resistor and the bimetallic electrostrictive blade delay switch are electrically connected via the heating resistor.

2. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 1, characterized in that: The L line is electrically connected to a thermistor which is respectively connected in series with the running winding and the starting winding; the L line is electrically connected to the N line via the running winding; and the L line is electrically connected to the N line via a thyristor starter (1).

3. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 2, characterized in that: The thyristor starter (1) further comprises a sealing cover (6) and a metal sheet metal sleeve (7) which are plugged into each other; a retaining frame (8) is plugged into the bottom of the metal sheet metal sleeve (7); and a first mounting cavity group (9) which is compatible with the thyristor Gate (3), the thyristor T1 end (4), and the thyristor T2 end (5) is provided on the surface of the retaining frame (8).

4. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 3, characterized in that: The bimetallic electrostrictive blade delay switch comprises a first plug-in sheet, a second plug-in sheet and a thermal expansion contact respectively plugged into a retaining frame (8); the retaining frame (8) is provided with a second installation cavity group (10), a third installation cavity group (11) and a fourth installation cavity group (12) respectively matched with the first plug-in sheet, the second plug-in sheet and the thermal expansion contact.

5. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 4, characterized in that: The first plug-in piece is a first conductive copper galvanized connecting piece (32); the second plug-in piece is composed of a second conductive copper galvanized connecting piece (13) and a bimetallic static contact (14) which are fixedly connected to each other; and the thermal expansion contact is composed of a third conductive copper galvanized connecting piece (15) and a bimetallic dynamic contact (16).

6. A canned motor single-phase motor thyristor starter module according to claim 5, characterized in that: The outer peripheral side of the sealing cover (6) is provided with a plurality of rubber handles (17) distributed in a circumferential array and fixed thereto; the outer peripheral side of the sealing cover (6) is provided with a first annular sealing groove (20) near its bottom; the outer peripheral side of the metal sheet metal sleeve (7) is provided with a second annular sealing groove (18); an elastic rubber ring (19) is sleeved on the metal sheet metal sleeve (7); the inner peripheral side of the elastic rubber ring (19) is provided with two groups of annular rubber sealing ribs (21) respectively matched with the first annular sealing groove (20) and the second annular sealing groove (18) from top to bottom; and the outer peripheral side of the elastic rubber ring (19) and the outer peripheral side of the rubber handle (17) are provided with a plurality of anti-slip grooves (22).

7. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 6, characterized in that: A sleeve (23) is symmetrically fixed to the outer peripheral side of the metal sheet metal sleeve (7) near its bottom; the retaining frame (8) is made of plastic material, and a U-shaped seat (24) with a hollow structure inside is symmetrically fixed to the outer peripheral side; an ear rod (25) is fixed to the inner wall of the U-shaped seat (24); and an inserting portion (26) that is inserted and matched with the inner wall of the sleeve (23) is slidably provided on the ear rod (25).

8. A canned motor single-phase thyristor starter module for a canned motor pump according to claim 7, characterized in that: The inner wall of the sleeve (23) is provided with a slot (27); the plug-in portion (26) comprises a support plate (28) slidably engaged with the inner wall of the sleeve (23); a guide hole (29) slidably engaged with the ear rod (25) is provided on the side of the support plate (28); a compression spring (30) sleeved on the ear rod (25) is fixedly connected between the support plate (28) and the inner wall of the U-shaped seat (24); an insert block (31) pluggably engaged with the slot (27) is fixed on the side of the support plate (28) near the top thereof; and a curved plate (33) is fixed on the side of the support plate (28).

Images