Water-cooled mining flame-proof all-in-one machine

Abstract

The invention belongs to the technical field of motors, and relates to a water-cooling mining flame-proof all-in-one machine. Comprising a motor, an end cover of a non-transmission end of the motor is connected with a frequency converter, and a water cooling structure is arranged in the frequency converter. The water cooling structure comprises a system water inlet, and the system water inlet is sequentially connected with a filtering device, a pressure reducing valve, a water cooling substrate, an end cover water inlet channel, a motor water channel, an end cover water outlet channel and a system water outlet. The water channel of the all-in-one machine is redesigned, the influence of external factors on the water channel is reduced, and the protection and strength of the water channel are upgraded and optimized. And the strength of the motor base and the water channel is increased, the junction box is separated, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric motors and relates to a water-cooled explosion-proof integrated machine for mining. Background Art

[0002] In recent years, with the steady and continuous improvement of my country's comprehensive national strength, the coal mining machinery industry has continued to develop and grow, and the demand for localization of key equipment has become increasingly urgent. The coal mining industry's requirements for key components continue to rise, especially in terms of motors, which are increasing and becoming increasingly stringent.

[0003] At present, the inverter of the integrated machine is placed above the motor. In view of the increasingly complex working conditions of the integrated machine, higher standards and requirements have been put forward for its external dimensions and other aspects. In the past, the IP level of the integrated machine was mostly IP55. However, with the widespread application of dust removal, spraying and other technologies in recent years, its IP level has been raised to IP67. At the same time, the water pressure of the cooling water in the mine is unstable during actual use, which can easily cause the motor to bulge. After the inverter is added, the risk factor is further increased. When the inverter is placed above the motor, it is difficult to reduce the size in the height direction, and the vibration of the motor will be transmitted to the inverter, causing it to vibrate, which will have an adverse effect on the electrical components. The existing IP level of the integrated machine is difficult to meet the current needs. If the IP requirements are to be met, the motor needs to adopt a rotating shaft lip seal and other structures, but in this case, the bearing is at risk of overheating and locking. The unstable water pressure in the mine will damage the water system of the integrated machine, which may not only cause the motor to bulge, but also damage the inverter water cooling base plate. In addition, the water pipes between the inverter and the motor are usually exposed or connected separately, which poses a high risk of damage.

[0004] Coal mine motors and inverters are gradually showing a trend of miniaturization and integration. Under special working conditions, there are specific limitations and requirements for the three-dimensional volume of the motor, which makes the integrated personalized design more diverse. In addition, the motors frequently have a series of problems such as poor waterproof performance, bulging water channels, and unreasonable water channel structure of the integrated machine, which need to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a water-cooled explosion-proof integrated machine for mining.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A water-cooled explosion-proof integrated machine for mining comprises a motor. A frequency converter is connected to the end cover of the non-transmission end of the motor, and a water cooling structure is arranged in the frequency converter.

[0008] Furthermore, the water cooling structure comprises a system water inlet, which is sequentially connected to a filter device, a pressure reducing valve, a water cooling base plate, an end cover water inlet channel, a motor water channel, an end cover water outlet channel, and a system water outlet.

[0009] Furthermore, the end cover water inlet channel includes an end cover water inlet, a water inlet channel and a first connecting port. Cooling water enters from the end cover water inlet and flows to the first connecting port through the water inlet channel. The end cover water outlet channel enters from the end cover water outlet and flows to the second connecting port.

[0010] Furthermore, the motor is provided with a motor outer cylinder, and a strip-shaped through hole is opened on the motor outer cylinder; water channel ribs are provided on the outer wall of the motor inner cylinder, and the water channel ribs cooperate with the strip-shaped through hole.

[0011] Furthermore, a bearing isolator is provided in the motor, and the bearing isolator is provided between the outer bearing cover of the motor and the rotating shaft of the motor.

[0012] Furthermore, a junction box is provided in the frequency converter, and the junction box connects the input end of the motor and the output end of the frequency converter.

[0013] Furthermore, the side surface of the frequency converter is connected to the end cover by screws.

[0014] Furthermore, the frequency converter is provided with ground feet.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, by optimizing the installation position of the inverter, the all-in-one machine can be more suitable for the placement environment, which plays a positive role in the promotion of the all-in-one machine, can optimize the use of space, and make the product more competitive.

[0017] Second, by optimizing the integrated rotating parts and installing a bearing isolator in the motor, the IP level and protection level of the integrated machine can be improved, and the temperature rise at the bearing of the integrated machine can be reduced, thereby reducing the failure rate and maintenance costs.

[0018] Third, the water cooling structure of the integrated machine is optimized to reduce the impact of external factors on the water channel, and the protection and strength of the water channel are upgraded and optimized. In addition, the motor base and water channel strength are increased and the junction box is separated to reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the water-cooled explosion-proof integrated machine for mining in the present invention;

[0022] Figure 2 It is a schematic diagram of the installation structure of the bearing isolator in the present invention;

[0023] Figure 3 It is a water circulation flow chart of the water cooling structure in the present invention;

[0024] Figure 4 It is a schematic diagram of the water cooling structure in the present invention;

[0025] Figure 5 It is a partial enlarged view of the A part of the water cooling structure in the present invention;

[0026] Figure 6 This is a schematic diagram of the outer cylinder of the motor in the present invention;

[0027] Figure 7 This is a schematic diagram of plug welding on the opening of the outer cylinder in the present invention;

[0028] Figure 8 It is a schematic diagram of the end cover water channel in the present invention.

[0029] Among them: 1 is the motor; 1.1 is the outer cylinder of the motor; 1.2 is the inner cylinder of the motor; 1.3 is the bearing isolator; 1.4 is the outer bearing cover; 1.5 is the rotating shaft; 2 is the frequency converter; 3 is the water cooling structure; 3.1 is the water inlet; 3.2 is the filtering device; 3.3 is the pressure reducing valve; 3.4 is the water cooling base plate; 3.5 is the end cover water channel; 3.51 is the first connecting port; 3.52 is the end cover water inlet; 3.53 is the water inlet channel; 3.54 is the second connecting port; 3.55 is the end cover water outlet; 3.6 is the motor water channel; 3.7 is the system water outlet; 4 is a strip through hole. DETAILED DESCRIPTION

[0030] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples of devices consistent with some aspects of the present invention as detailed in the appended claims.

[0031] Example

[0032] like Figures 1 to 8As shown, a water-cooled explosion-proof integrated machine for mining includes a motor 1, a frequency converter 2 is connected to the end cover of the non-driving end of the motor 1, and a water-cooling structure 3 is arranged in the frequency converter 2.

[0033] Through many exchanges with the OEM and the user unit, it was found that the place where it is used is relatively low and narrow, and there are restrictions on the height and width directions of the all-in-one appearance, only the length direction is not restricted. Therefore, the final appearance is confirmed that the motor 1 is at the front end, and the inverter 2 is directly installed on the non-drive end part of the motor 1. The width of the inverter 2 should be smaller than the width of the motor 1, and the height of the inverter 2 should be smaller than the height of the motor 1. The inverter 2 is directly connected to the motor 1 to reduce the connection lines and cable introduction devices and other components.

[0034] It is also required to improve the IP level of the motor, optimize the design of the rotating part where the shaft and the end cover are connected, and use a bearing isolator 3 with a waterproof function to ensure that the IP requirements are met and prevent overheating and locking. Finally, the rotating structure is changed and optimized, which significantly reduces the temperature at the bearing and can reach the IP67 level of protection.

[0035] Finally, the cooling structure is optimized. Users have experienced motor bulging in the past. To avoid such incidents, the cooling device of the all-in-one machine is optimized and designed. A pressure reducing valve is added to the inlet of the cooling water channel. After passing through the inverter water-cooling base plate, the water channel needs to enter the motor water channel through the end cover of the non-drive end. Because there are components on both sides of the non-drive end, it may cause poor heat dissipation after the bearing heats up. Therefore, a water channel is added to the end cover of the non-drive end, and then enters the motor water channel 3.6. The motor water channel 3.6 is increased by adding the motor outer cylinder 1.1 and the water channel ribs for plug welding to increase the strength of the motor water channel 3.6 and increase the pressure resistance of the motor water channel 3.6.

[0036] The present invention is a horizontal motor 1 with a rear-mounted frequency converter 2 in an integrated machine, wherein the motor 1 and the frequency converter 2 are connected together through an end cover at a non-driving end, thereby reducing the number of wiring terminals and cable introduction devices;

[0037] Furthermore, the water cooling structure 3 comprises a water inlet 3.1, which is sequentially connected to a filter device 3.2, a pressure reducing valve 3.3, a water cooling base plate 3.4, an end cover water channel 3.5, a motor water channel 3.6, and a system water outlet 3.7.

[0038] Furthermore, the end cover water channel 3.5 includes an inlet water channel and an outlet water channel, the inlet water channel includes an end cover water inlet 3.52, an inlet water channel 3.53 and a first connecting port 3.51, cooling water enters from the end cover water inlet 3.55, flows through the inlet water channel 3.53 to the first connecting port 3.51, and the outlet water channel enters from the second connecting port 3.54 and flows to the end cover water outlet 3.55.

[0039] Specifically, the cooling water flows out from the water-cooled base plate and enters the end cover water inlet 3.52, flows through the water inlet channel 3.53, flows into the water inlet of the motor water channel 3.6 through the first connecting port 3.51, flows into the second connecting port 3.54 from the water outlet of the motor water channel 3.6, flows from the second connecting port 3.54 to the end cover water outlet 3.55, and flows from the end cover water outlet 3.55 to the system water outlet.

[0040] In the optimization of the water cooling structure 3, a filter device 3.2 and a pressure reducing valve 3.3 are added to the water channel circulation, and an end cover water channel 3.5 is added in the middle, so that the water channel system of the integrated machine is formed as follows Figure 4 , Figure 5 In the structure shown, the optimized water channel is enhanced in pressure and purification capacity, the protection of the inverter 2 water-cooled base plate 3.4 is upgraded, and the heat dissipation at the non-drive end bearing of the motor is ensured, reducing the motor failure points;

[0041] Furthermore, the motor 1 is provided with a motor outer cylinder 1.1, and a strip-shaped through hole 4 is opened on the motor outer cylinder 1.1; the outer wall of the motor inner cylinder 1.2 is provided with water channel ribs, and the water channel ribs match the strip-shaped through hole 4. And a hole design is made at the junction of the motor outer cylinder 1.1 and the water channel ribs (such as Figure 6 As shown), after the motor outer cylinder 1.1 and the motor inner cylinder 1.2 are heat-fitted, the ribs and the outer cylinder opening are ensured to be at the same position, and finally the outer cylinder opening is plug-welded (as shown Figure 7 As shown), ensure the strength of the motor base and increase the strength of the motor water channel.

[0042] Furthermore, a bearing isolator 1.3 is provided at the rotating shaft of the motor 1, and the bearing isolator 1.3 is provided between the outer bearing cover 1.4 and the rotating shaft.

[0043] In terms of IP protection, a bearing isolator is used to replace the traditional rotating shaft lip seal, which has the following characteristics: 1. Non-contact design, less wear and less heat; 2. The dynamic ring moves synchronously with the shaft and can block the cutoff; 3. The operating temperature range is relatively wide; 4. The service life is long; 5. The installation method is similar to that of the lip seal, and it can be replaced without modification or with only slight modifications. After the subsequent structural changes, the feasibility of this plan was demonstrated through experiments.

[0044] Furthermore, a junction box is provided in the inverter 2 , and the junction box connects the input end of the motor 1 and the output end of the inverter 2 .

[0045] Furthermore, the side of the inverter 2 is connected to the end cover of the motor 1 by screws. In order to reduce the impact of the vibration of the motor 1 on the inverter 2, the motor wiring extends out of the terminal on the end cover side, is connected to the inverter output end through a copper bus or cable, and is connected to the inverter 2 externally through the threaded hole on the end cover.

[0046] Furthermore, the inverter 2 is provided with feet. The inverter and the motor are both provided with installation feet, which can ensure the stability of the installation, reduce the impact of the motor vibration on the inverter, and reduce the number of parts at the connection position.

[0047] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0048] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A water-cooled explosion-proof integrated machine for mining, characterized in that: It comprises a motor (1), wherein a frequency converter (2) is connected to the end cover of the non-transmission end of the motor (1), and a water cooling structure (3) is arranged inside the frequency converter (2).

2. A water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: The water cooling structure (3) comprises a system water inlet (3.1), and the system water inlet (3.1) is sequentially connected to a filter device (3.2), a pressure reducing valve (3.3), a water cooling base plate (3.4), an end cover water inlet channel, a motor water channel (3.6), an end cover water outlet channel, and a system water outlet (3.7).

3. A water-cooled explosion-proof integrated machine for mining according to claim 2, characterized in that: The end cover water inlet channel comprises an end cover water inlet (3.52), a water inlet channel (3.53) and a first connecting port (3.51); cooling water enters from the end cover water inlet (3.52) and flows through the water inlet channel (3.53) to the first connecting port (3.51); and the end cover water outlet channel enters from the end cover water outlet (3.55) and flows to the second connecting port (3.54).

4. The water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: The motor (1) is provided with a motor outer cylinder (1.1) and a motor inner cylinder (1.2); the motor outer cylinder (1.1) is provided with a strip-shaped through hole (4); the outer wall of the motor inner cylinder (1.2) is provided with water channel ribs, and the water channel ribs cooperate with the strip-shaped through hole (4).

5. The water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: A bearing isolator (1.3) is arranged in the motor (1), and the bearing isolator (1.3) is arranged between an outer bearing cover (1.4) of the motor (1) and a rotating shaft (1.5) of the motor (1).

6. The water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: A junction box is provided in the frequency converter (2), and the junction box connects the input end of the motor (1) and the output end of the frequency converter (2).

7. The water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: The side surface of the frequency converter (2) is connected to the end cover via screws.

8. The water-cooled explosion-proof integrated machine for mining according to claim 1, characterized in that: The frequency converter (2) is provided with a ground foot.

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