Three-phase asynchronous motor

Abstract

The utility model provides a three-phase asynchronous motor, and belongs to the technical field of machinery. The problem that an existing motor is poor in operation reliability is solved. The three-phase asynchronous motor comprises a horizontally arranged casing and a junction box body formed at the top of the casing, a cover plate is fixed on the junction box body, a supporting seat is formed on the outer wall of the upper end of the junction box body, and an annular groove is formed in the top surface of the supporting seat; a baffle ring is formed on the bottom surface of the cover plate; the lower end of the baffle ring extends into the annular groove; two sealing rings are coaxially arranged in the annular groove, the top faces and the bottom faces of the sealing rings are pressed on the bottom face of the cover plate and the bottom face of the annular groove respectively, and the baffle ring is clamped between the two sealing rings. An annular water storage cavity is formed among the baffle ring, the bottom wall of the annular groove and the two sealing rings, and the bottom wall of the water storage cavity is provided with a drainage hole which enables the water storage cavity to be communicated with the outside of the junction box body. The three-phase asynchronous motor is stable in operation.

Description

Technical Field

[0001] The utility model relates to a three-phase motor, in particular to a three-phase asynchronous motor. Background Art

[0002] A three-phase asynchronous motor is a type of electric motor that is powered by a 380V three-phase AC power supply (with a phase difference of 120 degrees). Since the rotor and stator rotating magnetic fields of a three-phase asynchronous motor rotate in the same direction but at different speeds, there is a slip, so it is called a three-phase asynchronous motor.

[0003] The junction box is an important component of the three-phase asynchronous motor. Its structure is as disclosed in the Chinese Patent Library, a highly protective cast iron motor junction box (application number: 201811000131.4), which includes a junction box seat, a junction box cover, and a rubber sealing gasket. The characteristics are: a rubber sealing gasket is provided between the junction box seat and the junction box cover, the junction box cover is provided with an inner stopper, the rubber sealing gasket is provided with a layer of stopper edging, and the inner wall of the stopper edging of the rubber sealing gasket is fastened to the outer wall of the upper port of the junction box seat.

[0004] When the junction box is actually used, if the rubber sealing gasket is damaged or aged, resulting in seal failure between the box cover and the box base, external liquid will penetrate into the junction box and flow into the motor barrel, affecting the normal operation of the motor. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to provide a three-phase asynchronous motor with reliable operation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a three-phase asynchronous motor, comprising a horizontally arranged casing and a terminal box body formed on the top of the casing, a cover plate fixed on the terminal box body, characterized in that a support seat in the shape of an annular ring and coaxial with the terminal box body is formed on the outer wall of the upper end of the terminal box body, and an annular groove is provided on the top surface of the support seat; a retaining ring coaxial with the terminal box body is formed on the bottom surface of the cover plate, and the lower end of the retaining ring extends into the annular groove; two sealing rings are coaxially arranged in the annular groove, the top and bottom surfaces of the sealing ring are respectively pressed against the bottom surface of the cover plate and the bottom surface of the annular groove, and the retaining ring is clamped between the two sealing rings; an annular water storage chamber is formed between the retaining ring, the bottom wall of the annular groove and the two sealing rings, and a drainage hole is provided on the bottom wall of the water storage chamber to connect the water storage chamber to the outside of the terminal box body.

[0007] Arranging two sealing rings in the radial direction of the annular groove can effectively lengthen the sealing path formed between the cover plate and the junction box body, thereby greatly improving the sealing effect formed between the cover plate and the junction box body and improving the reliability of motor operation.

[0008] At the same time, when the sealing ring ages after long-term use, the water that penetrates through the outer sealing ring can only flow downward under the obstruction of the retaining ring, and a partition is formed under the action of the drainage hole to prevent the water from flowing into the junction box body, thereby preventing water from directly entering the motor. This can protect the motor to a certain extent, extend its service life, and increase the reliability of the motor.

[0009] In the aforementioned three-phase asynchronous motor, the drain hole comprises an annular water receiving trough and a water inlet extending through the bottom wall of the trough. The trough and support base are coaxially arranged. The annular water receiving trough at the upper end of the drain hole effectively expands the volume at the upper end of the drain hole to receive more water, thereby further reducing the risk of water entering the motor and enhancing motor reliability.

[0010] In the above-mentioned three-phase asynchronous motor, the above-mentioned water diversion hole is in the shape of a straight bar and is vertically arranged to quickly discharge the infiltrated water and further prevent it from entering the interior of the motor.

[0011] In the above-mentioned three-phase asynchronous motor, among the two sealing rings, the inner edge of the outer sealing ring and the outer edge of the inner sealing ring are both arranged to connect with the water tank, so as to further increase the volume of the water tank and increase the difficulty of water entering the interior of the motor.

[0012] In the aforementioned three-phase asynchronous motor, the bottom surface of the cover plate extends downward to form a ring portion coaxial with the terminal box body, and the ring portion is sleeved outside the support base. The sealing ring is concealed within the ring portion to reduce the probability of the sealing ring contacting the outside, provide a certain degree of protection for the sealing ring, and prolong the sealing performance between the cover plate and the terminal box body.

[0013] In the aforementioned three-phase asynchronous motor, a row of heat sinks is formed on the top surface of the cover. The length of the heat sinks extends along the axial direction of the housing, and the row of heat sinks is arranged side by side along the width of the heat sinks. The arrangement of the heat sinks accelerates heat dissipation within the junction box, ensuring more reliable motor operation.

[0014] In the above three-phase asynchronous motor, the cover plate is a cast integral part.

[0015] Compared with the existing technology, this three-phase asynchronous motor has the following advantages:

[0016] 1. Two sealing rings are arranged in the radial direction of the annular groove, which can effectively lengthen the sealing path formed between the cover plate and the junction box body, thereby greatly improving the sealing effect formed between the cover plate and the junction box body and improving the reliability of motor operation.

[0017] 2. When the sealing ring ages after long-term use, the water that penetrates through the outer sealing ring can only flow downward under the obstruction of the retaining ring, and a partition is formed under the action of the drainage hole to prevent the water from flowing into the junction box body, thereby preventing water from directly entering the motor. This can protect the motor to a certain extent, extend its service life, and increase the reliability of the motor.

[0018] 3. The upper end of the drainage hole is an annular water receiving groove, which can effectively expand the volume of the upper end of the drainage hole to receive more water, thereby further increasing the difficulty of water entering the motor and enhancing the reliability of motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-phase asynchronous motor schematic diagram.

[0020] Figure 2 It is a cross-sectional schematic diagram of a three-phase asynchronous motor.

[0021] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0022] Figure 4 yes Figure 3 Enlarged schematic diagram of point B in the middle.

[0023] In the figure, 1. casing; 2. junction box body; 2a. support base; 2b. annular groove; 2c. drainage hole; 2c1. water receiving trough; 2c2. water diversion hole; 3. cover plate; 3a. retaining ring; 3b. ring part; 3c. heat sink; 4. sealing ring; 5. water storage chamber. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] The main improvement of this three-phase asynchronous motor lies in the junction box part, and other parts are existing. The existing technology part will not be described in detail here.

[0026] Specifically, if Figure 1 and Figure 2 As shown, the three-phase asynchronous motor comprises a horizontally arranged housing 1 and a terminal box 2 formed on top of the housing 1. The internal cavities of the terminal box 2 and the housing 1 are interconnected. The opening of the terminal box 2 faces upward, and a cover 3 is fixed to the terminal box 2 to cover the opening of the terminal box 2. In actual products, the cover 3 and the terminal box 2 are coaxially arranged and fixed to the terminal box 2 via a circle of vertically arranged screws.

[0027] in,

[0028] like Figures 2 to 4 As shown, a support base 2a in the shape of an annular ring and coaxial with the junction box body 2 is integrally formed on the outer wall of the upper end of the junction box body 2. An annular groove 2b is provided on the top surface of the support base 2a, and the annular groove 2b and the support base 2a are coaxially arranged. A retaining ring 3a is formed on the bottom surface of the cover plate 3 and coaxial with the junction box body 2, and the lower end of the retaining ring 3a extends into the annular groove 2b. Two sealing rings 4 are coaxially arranged in the annular groove 2b, and the top and bottom surfaces of the sealing ring 4 are pressed against the bottom surface of the cover plate 3 and the bottom surface of the annular groove 2b respectively, and the retaining ring 3a is clamped between the two sealing rings 4. Figure 1 As shown, an annular water storage chamber 5 is formed between the retaining ring 3a, the bottom wall of the annular groove 2b and the two sealing rings 4. The water storage chamber 5 is coaxially arranged with the junction box body 2, and a drainage hole 2c is provided on the bottom wall of the water storage chamber 5 to connect the water storage chamber 5 to the outside of the junction box body 2.

[0029] The radial arrangement of two sealing rings 4 along annular groove 2b effectively lengthens the sealing path between cover plate 3 and junction box body 2, significantly enhancing the seal between them and improving motor reliability. Furthermore, if sealing ring 4 ages due to long-term use, water that has penetrated through outer sealing ring 4 is blocked by retaining ring 3a, forcing it to flow downward. Drain holes 2c create a barrier to prevent water from flowing into junction box body 2, thus preventing water from directly entering the motor. This provides a degree of protection for the motor, extending its service life and increasing its reliability.

[0030] In this embodiment,

[0031] like Figure 4 As shown, the drain hole 2c consists of an annular water receiving groove 2c1 and a water inlet 2c2 extending through the bottom wall of the water receiving groove 2c1. The water receiving groove 2c1 and the support base 2a are coaxially arranged. The upper end of the drain hole 2c is an annular water receiving groove 2c1, which effectively expands the volume of the upper end of the drain hole 2c to receive more water, thereby further increasing the difficulty of water entering the motor and enhancing the reliability of the motor.

[0032] The water inlet hole 2c2 is in the shape of a straight strip and is vertically arranged to quickly discharge the infiltrated water and further prevent it from entering the interior of the motor.

[0033] To further illustrate, in the two sealing rings 4, the inner edge of the outer sealing ring 4 and the outer edge of the inner sealing ring 4 are both arranged to connect with the water groove 2c1. At this time, the width of the water groove 2c1 is greater than the distance between the two sealing rings 4, so as to further increase the volume of the water groove 2c1 and increase the difficulty of water entering the interior of the motor.

[0034] like Figure 2 and Figure 3As shown, the bottom surface of cover plate 3 extends downward to form a ring portion 3b coaxial with junction box body 2, and ring portion 3b is sleeved outside support base 2a. Sealing ring 4 is concealed within ring portion 3b, reducing the chance of sealing ring 4 coming into contact with the outside, providing a certain degree of protection for sealing ring 4 and prolonging the seal between cover plate 3 and junction box body 2.

[0035] In actual production, a row of heat sinks 3c is formed on the top surface of cover plate 3. The length of heat sinks 3c extends axially along the housing 1, and the row of heat sinks 3c is arranged side by side along the width of the housing 1. The provision of heat sinks 3c accelerates heat dissipation within the junction box 2, ensuring more reliable motor operation. Cover plate 3 is preferably a single-piece cast component.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A three-phase asynchronous motor, comprising a horizontally arranged housing (1) and a junction box body (2) formed on the top of the housing (1), a cover plate (3) being fixed on the junction box body (2), characterized in that: A support seat (2a) is formed on the outer wall of the upper end of the junction box body (2) and is coaxial with the junction box body (2), and an annular groove (2b) is provided on the top surface of the support seat (2a); a retaining ring (3a) is formed on the bottom surface of the cover plate (3) and is coaxial with the junction box body (2), and the lower end of the retaining ring (3a) extends into the annular groove (2b); two sealing rings (4) are coaxially provided in the annular groove (2b), the top surface and bottom surface of the sealing ring (4) are respectively pressed against the bottom surface of the cover plate (3) and the bottom surface of the annular groove (2b), and the retaining ring (3a) is clamped between the two sealing rings (4); an annular water storage chamber (5) is formed between the retaining ring (3a), the bottom wall of the annular groove (2b) and the two sealing rings (4), and a drainage hole (2c) is provided on the bottom wall of the water storage chamber (5) so that the water storage chamber (5) is connected to the outside of the junction box body (2).

2. The three-phase asynchronous motor according to claim 1, characterized in that: The drainage hole (2c) is composed of an annular water receiving groove (2c1) and a water inlet hole (2c2) penetrating the bottom wall of the water receiving groove (2c1), and the water receiving groove (2c1) and the support seat (2a) are coaxially arranged.

3. The three-phase asynchronous motor according to claim 2, characterized in that: The water inlet hole (2c2) is in the shape of a straight strip and is arranged vertically.

4. The three-phase asynchronous motor according to claim 2 or 3, characterized in that: In the two sealing rings (4), the inner edge of the outer sealing ring (4) and the outer edge of the inner sealing ring (4) are both arranged to butt against the water tank (2c1).

5. The three-phase asynchronous motor according to claim 1, characterized in that: The bottom surface of the cover plate (3) extends downward to form a ring portion (3b) coaxial with the junction box body (2), and the ring portion (3b) is sleeved outside the support seat (2a).

6. The three-phase asynchronous motor according to claim 1, characterized in that: A row of heat sinks (3c) is formed on the top surface of the cover plate (3); the length of the heat sinks (3c) extends axially along the housing (1); and the row of heat sinks (3c) are arranged side by side along the width direction of the heat sinks (3c).

7. The three-phase asynchronous motor according to claim 1, characterized in that: The cover plate (3) is a cast integral part.

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