RU2240939C1 - Railway air conditioner compressor set - Google Patents

Abstract

FIELD: mechanical engineering; air conditioners.

SUBSTANCE: invention can be used in air conditioners of passenger compartment, restaurant cars, etc. Proposed compressor set has frame with sealed compressor with built-in electric motor, cooling agent suction and delivery pipelines and static frequency and voltage converter. Static frequency and voltage converter is connected with section of suction pipeline made in form of flat panel manufactured of heat conducting material provided with channels to let cooling agent flow. Flat panel is connected with suction pipeline through collectors.

EFFECT: improved reliability of compressor set.

4 dwg

Description

The invention relates to railway air conditioners, in particular to the compressor units included in their composition, and can be used in the repair of air conditioners of the MABII type passenger compartment cars and restaurant cars.

The known compressor unit of the railway air conditioner MABII compartment cars of type 47K / K built by the Ammendorf plant (GDR), which is a frame with a gland compressor and a direct current electric motor mounted on it, interconnected by an elastic cam clutch [1]. The power supply of the MABII air conditioner and, accordingly, the compressor unit is carried out by a direct current voltage of 110 V from a generator driven by a wheelset. The compressor unit is located under the wagon and operates under the influence of dirt and moisture, leading to a loss of tightness of the compressor packing, leakage of refrigerant, cessation of operation of the air conditioner and the need for frequent repair of the compressor. In addition, periodic replacement of the brush brushes of the DC motor used to drive the compressor is required. When the electric motor is turned on, current surges occur, which adversely affect the reliability of the electric drive and the compressor unit as a whole.

Also known is a compressor unit of a railway air conditioner containing a frame with a sealed compressor in it with a built-in electric motor, refrigerant suction and discharge pipelines, equipped with a static frequency and voltage converter [2]. The compressor unit is powered by a DC generator driven by a pair of wheels. The static converter converts the direct current coming from the generator into a three-phase alternating current power supply of the hermetic compressor electric motor with automatic regulation of the frequency and amplitude depending on the heat load of the air conditioner according to the signals from the temperature sensors supplied with the air conditioner. In the known compressor unit, the converter is cooled by natural convection using a radiator, however, at high ambient temperatures and contamination of the surface of the radiator, the cooling efficiency is reduced, which leads to overheating of the converter and a corresponding decrease in the reliability of the compressor unit.

The aim of the invention is to increase the reliability of the compressor unit.

This goal is achieved due to the fact that in the compressor unit of the railway air conditioner, which contains a frame with a sealed compressor in it with a built-in electric motor, refrigerant suction and discharge pipelines, and equipped with a static frequency and voltage converter, a static frequency and voltage converter is connected to the suction pipe section made in the form of a flat panel of heat-conducting material, inside which there are channels for moving the refrigerant, This flat panel is connected to the suction pipe through the manifolds.

Comparative analysis with the prototype shows that the claimed device is characterized in that the static frequency and voltage converter is connected to the suction pipe section made in the form of a flat panel of heat-conducting material, inside which there are channels for moving the refrigerant, and the flat panel is connected to the suction pipe through the collectors .

Thus, the claimed device meets the criterion of "novelty."

Comparison of the proposed solution not only with the prototype, but also with other technical solutions in this technical field did not allow us to identify in them the features that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "significant differences".

Figure 1 shows the proposed compressor unit, the main view, figure 2 is the same, a top view, figure 3 is a section aa in figure 2, figure 4 is a view B in figure 2.

The compressor unit comprises a frame 1, on which a hermetic compressor 2 with a built-in induction motor 3, a suction pipe 4 and a refrigerant discharge pipe 5, a static frequency and voltage converter 6 are placed. The heat-generating surface of the converter 6 is connected to a section of the suction pipe 4 made in the form of a flat panel 7 from a heat-conducting material, inside which there are channels 8 for moving the refrigerant. The panel 7 is connected to the suction pipe 4 collectors 9.

The proposed device operates as follows.

The refrigerant from the refrigerant system of the air conditioner through the suction pipe 4 enters the hermetic compressor 2, where it is compressed and through the discharge pipe 5 is sent to the refrigerant system of the air conditioner. The hermetic compressor 2 is supplied with power from a direct current generator driven by a pair of wheels (not shown). Static Converter 6, the DC voltage coming from the generator turns into a three-phase alternating current power supply of the electric motor 3 of the hermetic compressor 2 with automatic frequency and voltage control depending on the heat load on the air conditioner according to the signals from the temperature sensors that the air conditioner is equipped with (not shown). With an increase in the heat load, the frequency of the current and its voltage increase, with a decrease in the load they decrease, the rotation speed of the electric motor 3 and the volumetric capacity of the hermetic compressor 2, and consequently the cooling capacity of the air conditioner, respectively change. The heat released during operation of the static converter 6 is transferred due to the heat conduction through the wall of the panel 7 to the refrigerant moving through the channels 8 inside the panel 7.

Since the cooling of the converter due to heat exchange with a coolant having a low temperature and moving through the channels inside the panel, which is part of the suction pipe, is much more efficient than due to the natural convection of the ambient air, especially at its high temperature, the thermal operation of the converter improves, thereby increasing its reliability.

The proposed technical solution ultimately improves the reliability of the compressor unit and the air conditioner as a whole.

Sources of information

1. Zvorykin M.L., Cherkez V.M. Air conditioning in passenger cars. Ed. 2nd, rev. and add. Textbook for technical schools. transport. M .: Transport, 1977, p. 171, fig. 80.

2. Decision of 2.08.2002 on the issuance of a certificate for the utility model “Compressor unit of a railway air conditioner” by application No. 2002109684/20, 04/12/2002

Claims (1)

A compressor unit of a railway air conditioner, comprising a frame with a hermetic compressor in it with a built-in electric motor, refrigerant suction and discharge pipelines, equipped with a static frequency and voltage converter, characterized in that the static frequency and voltage converter is connected to the suction pipe section made in the form of a flat panel from a heat-conducting material, inside which there are channels for moving the refrigerant, and a flat panel is connected a suction duct through the collectors.

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