JPH07208814A - Electrical compressor - Google Patents

Abstract

PURPOSE:To achieve energy saving and further to suppress the foaming phenomenon at the start of operation of a compressor by a method wherein oil is heated within a short period of time, the start time for operation of the compressor is shortened and efficient heat transfer is carried out. CONSTITUTION:A heat transfer member 5 is provided on the inner surface of a chamber 3 of an electrical compressor 1 and the heat of an oil heater 4 on the outer surface of the chamber 3 is efficiently transmitted to the lubricant oil 6 within the chamber 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor for compressing a refrigerant or the like.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 62-195497, there is known a system for detecting the ambient temperature and controlling the on / off of the heater to save energy. There is no description about the heat transfer structure of heat.

Further, the conventional electric compressor does not employ a system for efficiently transferring the heat of the oil heat retention heater by providing a heat transfer member in the chamber.

[0004]

In the conventional electric compressor, in order to keep the lubricating oil enclosed in the chamber at an operable temperature while the compressor is stopped, the heater attached to the outer surface of the chamber always keeps the temperature constant. is doing. The chamber is made of metal and has high thermal conductivity, but since there is no structure for efficiently transmitting the heat of the heater to the lubricating oil with low thermal conductivity inside the chamber, it is possible to warm the entire chamber from the heater and operate the lubricating oil further. The amount of heat that keeps the temperature is supplied. Since the thermal efficiency is low, there is a problem that the time from the start of heating to the state in which the compressor can be operated is long and the start-up is poor, and there is an uneconomical aspect that it consumes more heat than necessary for heat retention. It was

Further, the forming phenomenon due to the mixing of the lubricating oil and the refrigerant, which often occurs at the time of starting the compressor, is promoted as the temperature of the oil is lower, and in the conventional compressor without means for raising the oil temperature in a short time, Due to the phenomenon, the oil viscosity was drastically reduced and the compression mechanism was sometimes broken.

[0006]

In the electric compressor, a member for transmitting heat of the heater to the lubricating oil is provided on an inner surface portion of the electric compressor, which is opposed to an outer surface portion of the chamber heated by the heater for retaining the lubricating oil, thereby improving energy efficiency. This enabled a good lubricant heat retention method.

[0007]

In the electric compressor, the lubricating oil sealed in the chamber is kept warm by the heater attached to the outer surface of the chamber and is ready for operation. Here, the chamber is made of metal with good heat conduction, but oil does not have good heat conduction, so considering the general equation for heat conduction given by the following equation, Q = λ · A · Δt / l where Q is Heat quantity, λ is thermal conductivity, A is heat transfer area, Δt
Is the temperature change and l is the heat transfer distance.
The energy efficiency is poor because the structure is such that the oil is transmitted to a large metal chamber and warms the oil positively.

Therefore, a metal member having a large λ is attached to the inner surface of the chamber facing the heater attachment surface to shorten l,
By making the member a shape with a large heat transfer area A, an efficient heat conduction system can be achieved, so that the heat capacity of the heater can be reduced to save energy, and the oil can be warmed in a short time to increase the startup time. It can be shortened and the forming phenomenon at startup can be reduced.

[0009]

Embodiments of the present invention will be described with reference to FIGS. 1, 2 and 3
Will be explained.

In the embodiment of the electric compressor 1 shown in FIG. 1, the heat generated by the oil heater 3 is transmitted to the chamber 4 and then to the heat transfer member 5 which is in contact with the inner surface of the chamber 4 facing the oil heater 3 and lubricated. This is the structure transmitted to the oil 6.

In this structure, TA>TB> T, where TA is the temperature at point A, TB is the temperature at point B, and TC is the temperature at point C.
As compared with the conventional example shown in FIG. 4, the heat transfer area is large and the heat is transferred at a high temperature.

FIG. 2 shows the heat transfer member 5 provided with the holes 5a in consideration of the circulation of the lubricating oil 6 and heat convection in the embodiment of FIG. 1, and FIG. 3 is for further increasing the heat transfer area. The heat transfer member 5 provided with the protrusion 5b is shown.

[0013]

According to the present invention, in the electric compressor, a member for efficiently transmitting the heat of the heater to the lubricating oil is provided on the inner surface of the chamber facing the heater for keeping the lubricating oil warm, which is mounted on the outer surface of the chamber. Since the lubricating oil is kept warm, (a) the lubricating oil can be heated quickly, and the rise time of the compressor can be shortened.

(B) The heat capacity of the heater can be reduced, which is economical.

(C) If the compressor delayed start method is used, the oil temperature can be raised to an appropriate level by energizing only for a limited time after the thermostat is turned "ON", and unnecessary energization can be eliminated to enable energy saving operation. At the same time, there is no need to energize for several hours at the time of installation, and the work minutes can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of a heat transfer member.

FIG. 3 is a perspective view of another embodiment of the heat transfer member.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... electric compressor, 2 ... electric motor, 3 ... oil heater,
4 ... Chamber, 5 ... Heat transfer member, 6 ... Lubricating oil, 7 ... Compression mechanism.

Claims (1)

[Claims] 1. An electric compressor that includes an electric motor and a compression mechanism in a chamber, and compresses a refrigerant or the like. In an oil temperature heater attached to an outer surface of the chamber for lubricating oil sealed in the chamber. A member that efficiently transfers heat,
An electric compressor provided on an inner surface of a chamber facing a heater mounting surface.