RU2011002C1 - Thermal pump - Google Patents

Abstract

FIELD: cryogenic engineering. SUBSTANCE: cylinder is position within a case to form top (warm) and bottom (cold) spaces. The cold space is positioned within a cooling jacket. Detachable heat insulating pipe encloses an evaporator made of a ring coaxially arranged at the top part of the cylinder to form a space between the top edges of the cylinder and the evaporator. The cold space is made of a flexible member, e. g. a bellows. EFFECT: enhanced efficiency. 1 dwg

Description

 The invention relates to cryogenic technology and can be used to increase pressure and pump liquefied gases.

 Known autopulsing pump for removing heat from the object, containing an evaporator in thermal contact with the object, and a refrigerator connected to the evaporator by piping, discharging excess heat into the surrounding atmosphere [1].

 A gasifier pump is also known, comprising a housing, an evaporator, a cylinder with channels for supplying and discharging liquid, and a displacer installed in it with a regenerator that communicates the warm and cold cavities of the cylinder, the latter is placed in the cooling jacket and communicated with it via an exhaust valve [2].

 The known pump assumes the presence of a third-party source of energy for the reciprocating movement of the displacer, is structurally complex and not sufficiently reliable due to the presence of rubbing elements - a cylinder and a displacer.

 The aim of the present invention is to increase reliability and simplify the design.

 The drawing shows a schematic diagram of a thermal pump.

 The thermal pump contains a heat-insulating casing 1 with a cylinder 2 placed in it, the upper part of which is provided with an evaporator 3 hermetically fixed on it, and the lower part has an elastic element tightly fixed on it, for example, a bellows 4. Cylinder 2 and the evaporator 3 form the upper warm cavity " A ", and an elastic element, for example, bellows 4 - cold cavity" B ".

 The bellows 4 is placed in a cooling jacket 5 connected by an inlet valve 6 and a pipe 7 with a capacity of 8, and an exhaust valve 9 and a pipe 10 with a consumer (not shown).

 The evaporator 3 is made in the form of a ring hermetically connected to the cylinder 2 so that the edge 11 of the cylinder 2 protrudes above the lower end surface 12 of the evaporator 3, forming a gap “H” and an evaporation zone “B” with the upper end surface 13 of the evaporator 3. The highest point of the evaporator 3 by a pipe 14 and a valve 15 can be connected to the atmosphere or the vapor zone of the tank 8, and the warm cavity "A" by a pipe 16 and a valve 17 is connected to the liquid zone of the tank 8 or to a gas source, for example, a cylinder (not shown). In addition, the evaporator 3 is equipped with a removable heat-insulating jacket 18, and the cold cavity "B" has a developed surface, presented, for example, in the form of rods 19.

 The device operates as follows.

 The pump can be represented in four stages - cooling, start, steady state, stop.

 Closure. In the initial position, valves 6, 9 and valves 15, 17 are closed, and the heat-insulating jacket 18 is mounted on the evaporator 3.

 Increasing the pressure in the vessel 8 from which the liquid is to be pumped out, to the inlet pressure, when the valve 6 opens, fill the cooling jacket 5 with liquid. The steam formed during the cooling process is discharged from the cooling jacket 5 through the exhaust pipe 10.

 At the end of the cooling process, the cooling jacket 5 is completely filled with liquid.

 The cooling process time is determined experimentally.

 P at. To the end of the cooling process, the valve 17 is opened and the volume 2 (cavities "A", "B", the evaporator 3) is filled with a working medium.

 If the working medium is the liquid in the vessel 8, then to fill the volume 2, the pipeline 16 is connected to the liquid zone of the vessel 8, open the valve 15, and the liquid from the vessel 8 under the inlet pressure (if the pipe 14 is connected to the atmosphere) or under the hydrostatic pressure of the column the liquid in the vessel 8 (if the pipeline 14 is connected to the vapor zone of the vessel 8) enters the volume formed by the cavities "A" and "B", filling it. The completion of the filling process can be judged by the time determined experimentally, or by the appearance of a steady stream of liquid from the pipeline 14.

 At the end of the filling process, the valves 15 and 17 are closed.

 If the working medium is a gas, the condensation temperature of which is slightly higher than the temperature of the liquid in the tank 8, then to fill the cavities "A" and "B", the pipe 16 is connected to a gas source (not shown), while the valve 15 is closed. The gas entering volume 2 is condensed, and volume 2 is filled with its condensate. At the end of the filling process of the cavities “A” and “B” with condensed gas, which can be judged by the filling time determined experimentally, the valve 17 is closed.

 When the cavities "A" and "B" are filled with the working medium, and the valves 15 and 17 are closed, the heat-insulating jacket 18 is removed from the evaporator 3, giving heat from the environment, for example, the atmosphere, to the evaporator 3.

 Under the action of heat entering the evaporator 3, the liquid boils in the evaporator.

 INSTALLATION AND HANDLING. The vapor generated above the liquid mirror during its boiling displaces the liquid from the warm cavity "A" into the cold cavity "B", increasing its volume. In this case, the bellows 4 lengthens, and the liquid from the cooling jacket 5 through the opened valve 9 is pumped through the pipeline 10 to the consumer under a pressure lower than the saturated vapor pressure by an amount related to the static error of the elastic element - the bellows 4, depending on its elongation. When the liquid from the cavity "A" is completely expelled into the cavity "B" and all the liquid in the zone "C" of the evaporator 3 evaporates, the vapor is condensed on the liquid mirror of the cold cavity "B" located in the cooling jacket 5, due to the large surface of the cavity liquid mirror "B". Due to the condensation of the vapor, its pressure decreases, the pressure in the cooling jacket 5 decreases to the inlet pressure, and under the influence of the inlet pressure and the elastic forces of the bellows 4, the liquid from the cavity "B" is forced into the cavity "A". This continues the condensation of the vapor and the pressure drop in the cavity "A", which leads to the filling of the cavity "A" and the evaporator 3 through the gap "H" with a working medium, after which the cycle repeats.

 About t and n about in. The liquid injection process is stopped by opening valve 17 or valve 15, or putting a heat-insulating jacket 18 on the evaporator 3, or lowering the pressure in the vessel 8. The injection process also stops automatically when the pressure in the exhaust pipe 10 increases to a critical pressure of saturated vapor. (56) 1. U.S. Patent No. 3,139,837, cl. 417-105.

 2. Copyright certificate of the USSR N 495449, cl. F 04 B 15/08, 1975.

Claims (1)

 THERMAL PUMP containing a housing with inlet and outlet pipelines, an evaporator, a cylinder placed in the housing with the formation of the upper - warm and lower - cold cavities, the latter being located in the cooling jacket, characterized in that, in order to increase reliability and simplify the design, the pump is equipped with a removable heat-insulating jacket covering the evaporator, the latter is made in the form of a ring coaxially mounted in the upper part of the cylinder with the formation of a gap between the upper edges of the cylinder and the evaporator, and the zone evaporation, while the cold cavity of the cylinder is made in the form of an elastic element, such as a bellows.

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