FR2477689A1 - CONDENSING UNIT FOR HEAT PUMP - Google Patents

Abstract

CONDENSING GROUP CONSISTING OF A MOTORCOMPRESSOR, A SEPARATOR AND AN OIL COLLECTOR AS WELL AS A CONDENSER. ONE OR MORE MOTORCOMPRESSORS 2, 3 AND THEIR OWN, PARTLY CLOSED, LUBRICATION CIRCUIT 7, 8, 9, 10, 11 AS WELL AS COOLING TUBE 13 WINDING IN COIL CONCENTRICALLY AROUND THE STATOR OF ELECTRIC MOTOR 3 ARE HOUSED IN A CYLINDRICAL ENVELOPE 1 WHICH IS TIGHTLY CLOSED AND COATED WITH AN INSULATION AND SOUNDPROOFING MATERIAL 15 AND WHOSE INTERNAL VOLUME COMMUNICATED THROUGH THE OIL SEPARATOR 7 DIRECTLY TO THE COMPRESSOR DISCHARGE. APPLICATION TO THE REALIZATION OF HEAT PUMPS IN MODULAR FORM.

Description

1.

  The invention relates to a group of condensers

  heat pump. It is known that the heat pump is essentially a steam cooling machine consisting of a compressor which a pipe connects to the condenser which is connected on its side via

  a throttling valve and a corresponding

  the evaporator which is connected by another

  at the compressor inlet.

  The compressor and the condenser represent the

  condensation group in the structure mentioned above.

  above, that is to say on the circuit of the working fluid. The primary purpose of the heat pump is heating (not cooling) and for this purpose the heat energy is pumped to the environment and carried with the help of the work supplied for the control of the compressor. higher temperature level suitable for space heating or similar application. The performance of the pump

  heat p = Qc is determined by the ratio called "coeffi-

  of the amount of heat obtained and delivered to the condenser by the work Wk required to control the compressor and other auxiliary machines, the heating coefficient mentioned - is generally greater than 1 and gives a direct indication of the number of

heat produced per kWh spent.

  A mode of realization which is already used currently in known heat pumps includes different modules of the steam cooling machine, for example the compressor and its control motor, the condenser and the necessary reinforcements as well as the device. automatic control systems which are connected to the factory in a mounting group to facilitate on-site assembly work and to contribute to the reliable operation of the installation. Indeed, the assembly group which is assembled in the factory undergoes in the latter a careful control during which the sealing of all the connections is verified with extreme precision and therefore a group of this type can be considered as being very reliable in this regard. When a group of this type is mounted in the circuit 2. of the entire heat pump installation on the

  site, simply make two connections.

  This known solution of the assembly group is called in practice "condensing unit" and Figure 1 of the accompanying drawings, which schematically shows the entire circuit of the heat pump, allows to understand this arrangement, a broken line surrounding the "condensing unit" which forms a compact module ready for mounting. These known groups of condensation of the heat pump, which is thus formed of several conventional modules fixed on a corresponding frame on which they are connected by pipes and equipped with a corresponding automatic control device and the piping, form the editing group described above. These known assembly groups have poor energy efficiency due to heat losses occurring during the exchange of heat between the environment and the surface of the compressor, the condenser and other elements as well as connecting pipes. Another disadvantage is that they emit a lot of noise, have a large footprint and are essentially expensive for the reason that each module of a condensing unit of this type requires special control.

  under pressure to ensure safety and tightness.

  The invention is intended to eliminate the drawbacks

  mentioned above and, moreover, to obtain the following results: - an improvement of the thermal efficiency by using all the heat lost (coming from the friction of the moving parts of the compressor, from the heating of the stator of the electric motor, from the losses heat of

  compressor, condenser, other components

  linkages); - simplification and lowering of the cost price by

  technology to reduce the number of

  condensing unit and to simplify this

  the last, to reduce the number of

  sound and require only a single safety check and tightness of the entire condensing unit; 3. - a significant reduction of the noise obtained by the concept

  according to the invention of the embodiment of the device; and -

  the increase in the capacity that can be obtained in a simple manner by assembling several basic groups, this factor having a special importance because it makes it possible to adapt the capacity of the condensing unit to

  operation of the entire heat pump.

  The condensing unit for a pump

  heat and according to the invention, consisting of a compres-

  and its electric control motor which form a

  module in the form of a motor-compressor, as well as a separa-

  of an oil collector and a condenser,

  essentially characterized in that one or more motorcycles

  pressers as well as their own partially closed lubrication system and the cooling coil, which is

  surrounded concentrically around the stator of the electric motor

  are arranged in a cylindrical, hermetically

  closed, which is covered with a layer of insulation and soundproofing and whose internal volume is connected by means of the mentioned separator of oil directly to the discharge of the compressor, so that the pressure of

  condensation of the cooling circuit prevails

  in the group envelope. The condensing unit of the heat pump according to the invention therefore represents a

  assembly group which is enclosed in a heat

  fugitive and soundproofed and including the connections to the circuit of

the heat pump.

  The invention will be described in more detail in

  with reference to the accompanying drawings by way of examples which are in no way

and on which:

  - Figure 1 is a diagram of the known steam cooling circuit; - Figure 2 is a longitudinal section of a condensing unit of the heat pump along the line II-II of Figure 3; FIG. 3 is an end view of the condensing unit of the heat pump in the direction of the arrow III of FIG. 2, the insulation and the corresponding end of the casing being removed; 4. - Figure 4 is a plan view of the inside of the condensing unit of the heat pump in the direction of arrow IV of Figure 2, the upper part of

  insulation and that of the cylindrical envelope being removed.

Vees; and

  FIGS. 5a, 5b, 5c show schematically

  a basic condensation unit and the assembly of two, three or more of these groups of a heat pump according to the invention into a compact and enlarged group,

- hermetically closed.

  FIG. 1 is a diagrammatic representation of a known vapor cooling circuit which consists of a compressor K whose discharge is connected to the

  condenser C in which the vapors of the cooling fluid

  The condenser outlet C is connected via a throttle valve Rv to an evaporator E in which the condensed fluid - for example liquid - is vaporized and which draws heat Qc (on its environment

  immediately), the evaporator outlet being connected to the tubular

  suction lure of the compressor which receives the energy Wk for its control. The condensing unit, which is the subject of the invention, is surrounded by a broken line in this diagram and therefore comprises the compressor K as well as its control and the condenser C. The modules X and C of FIG. together

  in accordance with the new technological solution of the invention

  within a cylindrical common envelope 1 which

  is hermetically sealed and lined with heat

  fugging and soundproofing 15, this envelope housing by

  moreover other necessary modules and being described

  after in more detail with reference to FIGS. 2, 3 and 4.

  As shown in these last figures,

  The condensing unit of the heat pump according to the invention comprises a cylindrical casing 1 which is

  hermetically sealed and surrounded by a heat

  This envelope containing a motor compressor 3, 2 connected to the suction pipe 5. as well as to a pressurized duct 6 which makes it communicate with an oil separator 7. A duct 12 of FIG. outlet of the purified cooling vapors directly connects this separator 7 to the internal volume of the cylindrical casing 1 and a duct 8 connects this separator to an oil manifold 9 connected on the one hand to a lubrication pump 10 mounted on the compressor 2 and, on the other hand, to a reflux duct 11. The condensing unit of the heat pump furthermore comprises a condenser cooling coil 13 which is wound in at least one layer, but if possible in several layers around the stator of the electric motor 3,

  both ends of the cooling coil 13 result in

  weaving at the inlet and outlet connections C and D of the circulating fluid (for example water). A connection B of the suction duct 5 connected to the suction of the compressor 2 and another connector A of the condensate discharge duct 14 are mounted on the casing of the casing 1. As shown in FIG. 3, envelope 1 also supports

  the connection chambers 20 of the electric motor 3.

  The condensing unit of the heat pump operates in the following way: The compressor 2 draws the vapors of the cooling fluid on the evaporator not shown and thus these vapors arrive through the connection B in the direction of the arrow in the duct 5 suction of the compressor 2, the latter compressing the vapors and discharging through the conduit 6 (Figures 2 and 4) in the oil separator 7 wherein the bulk of this oil is removed from the vapors of the cooling fluid. The separated oil falls on the bottom

  separator 7 from which it flows by itself through the channel

  8. The oil sucked into the collector

  9 by means of the pump 10 is discharged by the hollow shaft 4 control to the different lubrication points. The maximum pressure required is set in the

  reflux 11 which discharges the excess oil into the collector 9.

  The purified vapors of the cooling fluid leave the separator 7 through the outlet duct 12 and thus flow

  in the direction of the arrow F in the internal volume of the enve-

  6. loppe 1 in which they condense on the coil of

  13. Condensate (liquid cooling medium)

  dissement) falls on the bottom of the cylindrical casing 1. The liquid leaves the casing 1 in the direction of the arrow E by the evacuation pipe 14 and the corresponding connection A to be returned to the circuit of the heat pump who

  is not shown in Figure 2.

  The cooling water of the coil 13 of the condenser arrives via the connection C and leaves via the connection D. It is clear from the drawings and the

  above description that the technological solution of the

  condensing unit of the heat pump according to the invention

  This arrangement makes it possible to minimize heat losses with a provision in which all the elements are contained with a small space in a common cylindrical envelope 1 which is hermetically closed and connected as described above to the circuit of the heat pump. shell being well insulated externally with a corresponding material 15 of heat insulation and soundproofing, this embodiment can be realized from

  simple way because of the cylindrical shape of the enve-

  Loppe. The basic condensing unit of the heat pump according to the invention, as shown in FIGS. 2, 3 and 4 and described above, can be assembled according to the invention into condensation groups.

  more important ones that are juxtaposed and housed in a

  common cylindrical loppe 1 whose dimensions are in

  consequence, as shown schematically

  only in FIGS. 5a, 5b and 5c.

7.

Claims (1)

CLAIM   Heat pump condensing unit, consisting of a motor compressor, a separator, an oil collector and a condenser, characterized in that one or more motor-compressors (2, 3) and their clean, partially closed, lubrication system (7, 8, 9, 10, 11) as well as the cooling pipe (13) wound in a serpentine and concentrically around the stator of the electric motor (3) are housed in a cylindrical shell (1 ) which is hermetically sealed and covered with a material (15) for heat insulating and soundproofing and the internal volume of which is connected through the oil separator   (7) directly to the discharge of the compressor (2).