583results about "Compression machines with cascade operation" patented technology

The utility model relates to an oil way system, a cascade unit, energy-saving equipment and refrigeration equipment, the oil way system comprises a first heat exchanger, a first oil tank and a second oil tank, a first channel and a second channel are arranged in the first heat exchanger, and heat exchange can be conducted between the first channel and the second channel; two ends of the first oil tank are respectively communicated with the first channel to form a first circulating oil path; the two ends of the second oil tank communicate with the second channel to form a second circulating oil way. According to the oil way system, when the oil temperature in the first oil tank and the oil temperature in the second oil tank have a large temperature difference, the oil temperature of one oil tank is too low, and the oil temperature of the other oil tank is too high or too high, heat exchange between the two circulating oil ways can be achieved through the first heat exchanger; and therefore, the conditions of too low oil temperature and too high oil temperature are relieved synchronously, and normal operation of an oil way can be guaranteed. No extra heating assembly or oil cooling assembly is needed, and the power consumption and the manufacturing cost of the oil way system can be obviously reduced.

A system for generating steam for industrial heat. The system may include a plurality of heat pump cycles in thermal communication with each other and in thermal communication with a steam generation cycle. The plurality of heat pump cycles may include first and second heat pump cycles. The first heat pump circulates a first a working fluid and includes a first heat exchanger. The second heat pump cycle circulates a second working fluid and includes a second heat exchanger. The first heat exchanger transfers heat from the first to the second working fluid. The second heat exchanger transfers heat to a third working fluid in the steam generation cycle.

The invention discloses an oil return control method and system of a cascade heat pump system, and the control method comprises the following steps: 1, detecting a first state parameter of an intermediate heat exchanger so as to adjust a compressor and a throttling device at a low-temperature side and a high-temperature side, and when a second state parameter at the low-temperature side meets a condition, adjusting the compressor and the throttling device at the high-temperature side; the operation frequency of the compressor on the low-temperature side / high-temperature side is adjusted again, and return oil flushing is conducted on the intermediate heat exchanger; the second method comprises the following steps: respectively calculating the accumulated carbonization time of the corresponding lubricating oil in the low-temperature side or the high-temperature side, and judging whether the lubricating oil is replaced or not based on the accumulated carbonization time; and the third method comprises the steps that the accumulated low-frequency operation duration of the compressor on the low-temperature side or the high-temperature side in the low-frequency state is detected, and when the triggering condition is met, the operation frequency of the compressor is increased. Based on the control method, the operation reliability and the energy efficiency performance of the cascade heat pump system are improved, and the service life of equipment is prolonged.

The invention discloses an ultralow-temperature cascade refrigeration device, belongs to the technical field of refrigeration devices, and solves the problems that when a low-temperature screw compressor continuously operates below-80 DEG C, organic acid generated by hydrolysis of trace moisture and ester lubricating oil and metal chips form colloidal deposition, the resistance of a slide valve is increased, displacement lag is caused, and the service life of the slide valve is prolonged. However, the sensor only feeds back an instruction signal and cannot be monitored by a control system, and finally bearing wear or energy efficiency reduction is caused. Comprising a screw compressor and a slide valve state monitoring circuit arranged in the screw compressor. The actual displacement of the slide valve is measured in real time through double-frequency laser interference, the thickness of jelly is analyzed in combination with acoustic surface wave frequency shift, the fault index is calculated after dynamic compensation, early warning is conducted when the limit is exceeded, a blind area of a traditional sensor is eliminated, diagnosis is conducted in advance, and compressor bearing abrasion is avoided.

The invention relates to the technical field of sample storage, particularly provides a cascade refrigeration system and a control method of an ultralow-temperature sample library, and aims to solve the problem that normal operation of a unit is affected due to abnormal oil return of an existing cascade refrigeration system. In order to achieve the purpose, the cascade refrigeration system comprises a high-temperature-stage refrigeration unit, a low-temperature-stage refrigeration unit and an intermediate heat exchanger, the low-temperature-stage refrigeration unit comprises a low-temperature compressor, an oil separation device and a heat exchange device, the oil separation device comprises a plurality of oil separators arranged in sequence, and a heat exchanger is arranged between every two adjacent oil separators; the low-temperature compressor, the oil separation device, the intermediate heat exchanger and the heat exchange device are communicated with one another to form a low-temperature-stage refrigerant circulation loop, and the high-temperature-stage refrigeration unit and the intermediate heat exchanger are communicated with one another to form a high-temperature-stage refrigerant circulation loop. The oil separation efficiency can be improved, deep oil removal is achieved, and oil return is remarkably improved.

An assembly includes a fluid conditioning system including a cascade module and an active charge compensator integrated into the fluid conditioning system. The fluid conditioning system is transformable between a first mode and a second mode. In the first mode, the fluid conditioning system includes a first vapor compression loop and a second vapor compression loop. The first vapor compression loop and the second vapor compression loop are thermally coupled at the cascade module and the second vapor compression loop is fluidly separate from the first vapor compression loop. In the second mode, the fluid conditioning system includes a single vapor compression loop. The active charge compensator is operable to control a working fluid charge within the fluid conditioning system based on the mode of operation selected from the plurality of modes.

The invention relates to the technical field of water chilling unit control, in particular to a multi-connected control system for a low-temperature cascade water chilling unit. The system comprises a data acquisition module used for acquiring historical and real-time refrigeration parameter sequences; the refrigeration demand analysis module screens an abnormal period based on the volatility of different period parameter sequences, and calculates a historical refrigeration demand degree in combination with normal period data; the adjustment degree analysis module identifies abnormal units through parameter deviation and gives an alarm, non-abnormal units are sorted according to the parameter deviation degree to generate a demand sequence, and the pressure adjustment degree of the units is dynamically calculated in combination with liquid level distribution; and the adjustment control module performs pressure control on the unit according to the demand sequence and the pressure adjustment degree. According to the method, the historical data and the real-time parameters are fused, the abnormity is responded in time, the unit pressure is dynamically adjusted, the influence of the abnormal unit on the cooperative operation stability of the multiple units under the complex condition is reduced, and the refrigeration effect of the low-temperature refrigeration system meets the high reliability requirement.

The invention discloses an assembly type pressure-bearing refrigeration system, and particularly relates to the technical field of refrigeration equipment, the assembly type pressure-bearing refrigeration system comprises a container and a combined type refrigeration cycle unit integrated in the container, and the combined type refrigeration cycle unit comprises a low-temperature-stage refrigeration cycle assembly and a high-temperature-stage refrigeration cycle assembly; the low-temperature-stage refrigeration cycle assembly comprises a pressure-bearing liquid storage tank, and the bottom of the pressure-bearing liquid storage tank is fixedly communicated with a refrigerant liquid outlet. Through high-temperature-stage and low-temperature-stage double-circulation collaborative design and a safe pressure control mechanism, the technical bottleneck of a traditional refrigerating system is broken through, the contradiction that low temperature and safety of traditional high-pressure refrigerating equipment cannot be considered at the same time is solved, stable and safe operation at the ultralow temperature ranging from-20 DEG C to-30 DEG C is achieved, and the refrigerating efficiency is improved. Ultralow-temperature refrigeration is achieved through pressure bearing and high-temperature-level and low-temperature-level double-circulation cooling, so that larger-area refrigeration is achieved through lower temperature, modularized integration of the whole system is achieved through a container, and the adaptive pain point that a traditional refrigeration system is fixedly installed and cannot be moved is solved.

The invention discloses a wide-temperature-range cascade heat pump system, a control method thereof and a lubricating oil system, and relates to the technical field of heat pump systems, in particular to the wide-temperature-range cascade heat pump system which comprises a low-temperature-section circulation subsystem and a high-temperature-section circulation subsystem. The low-temperature section circulation subsystem comprises a low-temperature section evaporator, a low-temperature section compressor, a low-temperature section condenser and a cascade heat exchanger; the high-temperature section circulation subsystem comprises a high-temperature section evaporator, a high-temperature section compressor and a high-temperature section condenser; according to the scheme provided by the invention, the energy consumption can be reduced, the carbon emission is reduced, and the reliability and operation efficiency of equipment are improved.

A primary refrigerant circuit allows circulation of a primary refrigerant and includes a primary compressor, a cascade heat exchanger, and a primary heat exchanger. A secondary refrigerant circuit allows circulation of a secondary refrigerant and includes a secondary compressor, the cascade heat exchanger, and a utilization heat exchanger. The primary refrigerant circuit includes a first connecting pipe, a primary first connection pipe, and a liquid connecting pipe connecting the cascade heat exchanger and the primary heat exchanger, a primary suction flow path of the primary compressor, a primary subcooling circuit connecting the liquid connecting pipe and the primary suction flow path, and a primary subcooling expansion valve provided in the primary subcooling circuit.

The invention relates to the technical field of refrigeration devices, and discloses a control method for refrigeration equipment, the refrigeration equipment and a computer readable storage medium. The refrigeration equipment comprises a box body, a door body and a compressor, and the control method for the refrigeration equipment comprises the steps that in response to a door body closing request, temperature change information in the box body is obtained; and the operation frequency of the compressor is adjusted according to the temperature change information. By monitoring the temperature change information in the box body, the operation frequency of the compressor is adjusted according to the obtained temperature change information. Compared with the prior art, the operation time of the compressor is prolonged, the temperature change condition is not considered, and the operation frequency of the compressor is directly increased. According to the control method adopted by the invention, the operation frequency of the compressor can be adjusted according to the temperature change information, so that the effect of saving energy consumption is achieved.

This invention provides a carbon dioxide recovery cascade refrigeration system, including a circulation loop and a first heat exchanger, a compressor, a condenser, and a first oil drain pipe disposed on the circulation loop. The circulation loop is used for the flow of carbon dioxide heat exchange medium. The first heat exchanger has independent first and second heat exchange channels. The first heat exchange channel has a first inlet and a first outlet. The second heat exchange channel has a second inlet and a second outlet respectively connected to the circulation loop. The carbon dioxide heat exchange medium in the second heat exchange channel is used to reduce the temperature of the medium in the first heat exchange channel. An oil drain port is provided at the bottom of the first heat exchange channel. The gas inlet of the compressor is connected to the second outlet of the first heat exchanger. The condenser is located downstream of the compressor and is used to condense the carbon dioxide heat exchange medium after compression by the compressor. The oil drain port is connected to the inlet of the compressor through the first oil drain pipe. This system uses carbon dioxide as the heat exchange medium, resulting in low cost.

The control method comprises the steps that the rotating speed of a high-temperature-stage inverter compressor is mainly comprehensively determined by the high-temperature-stage exhaust temperature, the high-temperature-stage condenser temperature, the high-temperature-side outlet temperature of an intermediate heat exchanger and the high-temperature-stage return air temperature; through dynamic adjustment of the first fuzzy PID controller, the working condition and energy efficiency of the high-pressure side of the system are optimized; the rotating speed of the low-temperature-stage frequency conversion compressor is mainly comprehensively determined by the temperature in the box, the real-time rotating speed of the high-temperature-stage compressor, the low-temperature-stage exhaust temperature, the temperature of the intermediate heat exchanger and the low-temperature-stage return air temperature, and the rotating speed is dynamically adjusted through the second fuzzy PID controller so as to ensure that the temperature in the box is accurate and stable and is matched with the high-temperature-stage capacity in real time. Through cooperative control of the parameter groups, the problems of low efficiency and unstable operation caused by mismatching of two-stage capabilities of the cascade system are solved, and efficient, stable and reliable operation of the system under all working conditions is realized.

The invention provides a refrigerating system and an air conditioner, the refrigerating system comprises a first compressor, a first heat exchanger, a first valve, a second heat exchanger and an ejector, the first compressor, the first heat exchanger, the first valve and the second heat exchanger are connected to form at least partial structure of a first refrigerating loop; the ejector comprises a first inlet end, a second inlet end and a first outlet end, the first inlet end is communicated to the outlet end of the second heat exchanger, the second inlet end is communicated to the exhaust end of the first compressor, and the first outlet end of the ejector is communicated to the inlet end of the second heat exchanger. According to the invention, the evaporation or condensation heat exchange efficiency can be improved, so that a refrigerant which does not fully exchange heat can continuously participate in heat exchange circulation, and the compressor is prevented from sucking air and carrying liquid; the problem that in a heat exchanger of a refrigerating system in the prior art, heat exchange of refrigerants is not sufficient, and consequently the refrigerants are not completely evaporated or condensed is effectively solved.

The utility model discloses a low-temperature refrigerating system in a high-humidity environment. The low-temperature refrigerating system comprises a dehumidifier arranged below a refrigerating evaporator, the dehumidifier is communicated with the cascade refrigerating unit through a refrigerant pipeline, a refrigerant inlet pipeline is provided with an electromagnetic valve used for controlling refrigerant to enter, and a refrigerating discharge pipeline is provided with a temperature sensor used for monitoring the temperature of an outlet of the dehumidifier. The box body temperature sensor is arranged in the environment test box and is used for acquiring the temperature in the box body. According to the scheme, the problem that the surface of the evaporator frosts during cooling under the high-humidity working condition can be solved.

The installation (21) comprises: a primary refrigerant circuit (22), including: - an outdoor unit (23) comprising at least: a first compressor (34), a first heat exchanger (25) configured to exchange heat between a first refrigerant and the outside air, and at least one first expansion valve (26), - an indoor unit (29) comprising at least one second heat exchanger (30) configured to exchange heat between the first refrigerant and the inside air, a secondary refrigerant circuit (32) independent of the primary circuit (22), intended to be installed inside the dwelling and comprising: - a water heater comprising a tank (33), a condenser (35), a second compressor (34) and at least one second expansion valve (36),the primary circuit (22) comprising at least one third heat exchanger (37) allowing the primary circuit (22) and the secondary circuit (32) to be thermally coupled directly or indirectly. Figure from the abstract: Figure 2,

Systems and methods for regenerative ejector-based cooling cycles that utilize an ejector as the motivating force in a cooling loop to regeneratively sub-cool a refrigerant in a single-stage cooling cycle.

A vapour compression refrigeration system has a main refrigerant circuit having a main gas cooler or condenser arranged in a high pressure branch, a first main evaporator arranged in a first low pressure branch, a main compressor fluidically connecting the first low pressure branch to the high pressure branch, and an expansion device connecting the high pressure branch to an intermediate pressure branch. The system has a by-pass branch connecting the high-pressure branch to the intermediate pressure branch and provided with a by-pass valve, a secondary refrigerant circuit having a secondary gas cooler or condenser arranged in a secondary high pressure branch, a secondary evaporator arranged in a secondary low pressure branch, and a secondary expansion device connecting the secondary high pressure branch to the secondary low pressure branch. A rotary pressure exchanger is fluidically connected to the by-pass branch downstream of the by-pass valve and the secondary refrigerant circuit.

A refrigeration cycle apparatus according to the present disclosure includes a heat medium circuit in which a heat medium circulates. The heat medium circuit includes a plurality of load-side heat exchangers that cause heat exchange to be performed between first refrigerant and the heat medium, a plurality of use-side heat exchangers into which the heat medium supplied from at least one of the load-side heat exchangers flows, and a pump. In the heat medium circuit, the heat medium is supplied to a first load-side heat exchanger and a second load-side heat exchanger by the one pump, where the first load-side heat exchanger is one of the load-side heat exchangers, and the second load-side heat exchanger is one of those of the load-side heat exchangers that supply the heat medium having a temperature different from a temperature of the heat medium that is supplied by the first load-side heat exchanger.

The invention relates to the technical field of ultralow-temperature treatment equipment, in particular to a cascade refrigeration system for a cold therapy instrument, which comprises a first-stage compression cycle module, a second-stage compression cycle module, a third-stage compression cycle module, a fourth-stage compression cycle module, a fifth-stage compression cycle module and a sixth-stage compression cycle module, the first-stage compression circulation module is connected with the second-stage compression circulation module in parallel through the first heat exchanger, and a second heat exchanger and a composite evaporator are arranged on the second-stage compression circulation module; and the third-stage compression circulation module is connected with the second-stage compression circulation module in parallel through the second heat exchanger, and the third-stage compression circulation module is communicated with the composite evaporator. The air conditioner has the effect of increasing the refrigerating temperature range.

The utility model discloses a cascade refrigerating system which comprises a high-temperature-stage refrigerating unit and a low-temperature-stage refrigerating unit. The high-temperature-stage refrigerating unit comprises a high-temperature-stage compressor, a high-temperature-stage condenser and a cascade heat exchanger serving as a high-temperature-stage evaporator. The low-temperature-stage refrigerating unit comprises a low-temperature-stage compressor, a low-temperature-stage evaporator and the cascade heat exchanger serving as a low-temperature-stage condenser in the low-temperature-stage refrigerating unit. A pre-cooling heat exchanger is arranged on a pipeline between the low-temperature-stage compressor and the cascade heat exchanger and arranged on one side of the high-temperature-stage condenser, and the pre-cooling heat exchanger and the high-temperature-stage condenser share a condensation fan. High-temperature and high-pressure gas exhausted by the low-temperature-stage compressor is primarily cooled through the pre-cooling assembly and then is further cooled through the cascade heat exchanger, and the refrigerating capacity of the high-temperature-stage compressor is effectively reduced.

A system includes a pressure exchanger (PX) configured to receive a first fluid at a first pressure, receive a second fluid at a second pressure, and exchange pressure between the first fluid and the second fluid. The first fluid is to exit the PX at a third pressure and the second fluid is to exit the PX at a fourth pressure. The system further includes a first heat exchanger configured to provide the first fluid to the PX and provide corresponding thermal energy from the first fluid to a third fluid. The system further includes a turbine configured to receive the third fluid output from the first heat exchanger. The turbine is further configured to convert corresponding thermal energy of the third fluid into kinetic energy.

In a cooling system for cooling the interior of a vehicle by circulating a CO2-containing refrigerant, the refrigerant reliably and efficiently cools a battery. A cooling system (100) is provided with: a compressor (1) that compresses a refrigerant; a heat exchanger (2) for cooling the refrigerant from the compressor (1); heat exchangers (5a, 6a) that use the refrigerant cooled by the heat exchanger (2); a refrigerant passage (17) for supplying the refrigerant from the heat exchangers (5a, 6a) to the battery (6); a refrigerant passage (14) for supplying the refrigerant cooled by the heat exchanger (2) to the refrigerant passage (17) without passing through the heat exchangers (5a, 6a); an expansion valve (E2) provided in the refrigerant passage (17); the flow regulating valve (V3) is arranged on the refrigerant channel (14); wherein the control device (80) increases the opening degree of the flow regulating valve (V3) when the specific enthalpy of the refrigerant supplied to the battery (6) exceeds a prescribed range, and decreases the opening degree of the flow regulating valve (V3) when the specific enthalpy is below the prescribed range.

Temperature control system for temperature-controlling a room, comprising: a primary circuit (11); a secondary circuit; a first heat exchanger (1) with a primary side (10) and a secondary side (12), wherein the first heat exchanger (1) is configured to couple the primary circuit (11) and the secondary circuit, and wherein the primary circuit (11) is configured to extract heat from the secondary side (12) of the first heat exchanger (1) via the primary side (10) of the first heat exchanger, wherein the secondary circuit comprises: the secondary side (12) of the first heat exchanger (1); a manifold (2) which, in operation of the temperature control system, is arranged below (60) the secondary side of the first heat exchanger (1); a pump (3) which is coupled to the manifold (2);and a second heat exchanger (4) which, during operation of the temperature control system, is arranged in thermal interaction with the space (5) to be temperature controlled and is located above the collector (2); and a secondary fluid (50) which, during operation of the temperature control system, is arranged in the secondary circuit and is pressurized such that a phase change from a liquid secondary fluid to a vaporous secondary fluid takes place in the second heat exchanger (4) and a phase change from the vaporous secondary fluid to the liquid secondary fluid takes place in the secondary side (12) of the first heat exchanger (1).

This invention discloses a highly stable binary refrigeration compressor unit, comprising: a base, an evaporator mechanism, a condenser, a liquid receiver, a first compressor, a second compressor, an oil separator, a dryer filter, a first solenoid valve, a first outlet throttling valve, a first return throttling valve, a check valve, a plate heat exchanger, a second solenoid valve, a second outlet throttling valve, and a second return throttling valve. The evaporator mechanism is located on the outer right side of the base, and its interior includes adjustable evaporator components, adjustment components, and auxiliary heat exchange components. This highly stable binary refrigeration compressor unit can achieve a matching relationship between the compressor, condenser, throttling valve, and evaporator, providing an accurate basis combining theoretical calculations and practical application heat absorption and release coefficients, achieving optimal configuration of the entire refrigeration system. Furthermore, it can instantly adjust the evaporator's operating efficiency according to actual needs, achieving energy saving and noise reduction.

The cascade type cold and heat cogeneration system comprises a high-temperature-stage circulation unit and a low-temperature-stage circulation unit, and the high-temperature-stage circulation unit and the low-temperature-stage circulation unit are coupled through an intermediate heat exchanger; a cooling heat exchanger is arranged in front of a refrigerant inlet of a high-temperature-stage valve in the high-temperature-stage circulating unit; a low-temperature fluid inlet / outlet of a low-temperature heat exchanger in the low-temperature circulation unit communicates with a low-temperature fluid inlet / outlet of the cooling heat exchanger to form a circulation path; and the cooling heat exchanger is used for reducing the temperature of the high-temperature refrigerant passing through the cooling heat exchanger according to heat exchange between the flowing-in low-temperature-stage fluid and the high-temperature-stage refrigerant. In this way, the temperature of the high-temperature-stage refrigerant passing through the cooling heat exchanger can be reduced, local temperature limiting cooling is conducted on the high-temperature-stage valve, it is guaranteed that the high-temperature-stage valve operates within the normal temperature range, the service life of the high-temperature-stage valve is prolonged, and the structural stability of the high-temperature-stage valve is improved.

The invention provides a cascade heat pump and an adjusting method, and relates to the technical field of heat pumps. The cascade heat pump comprises a first-stage heat pump circulation system, a second-stage heat pump circulation system and a tail end pipeline, the first-stage heat pump circulation system comprises a first compressor, a hot side channel of a gas cooler, a hot side channel of a cascade heat exchanger, a first expansion valve and an evaporator which are sequentially connected to form a first refrigerant circulation; the second-stage heat pump circulation system comprises a second compressor, a condenser, a second expansion valve and a cold side channel of the cascade heat exchanger which are sequentially connected to form a second refrigerant circulation; the tail end pipeline is sequentially communicated with a cold side channel of the gas cooler and a cold side channel of the condenser in the conveying direction. According to the cascade type heat pump, due to the flow direction arrangement of the gas cooler and the tail end pipeline, the effective energy of the hot side channel and the cold side channel in the condenser in the heat exchange process can be effectively improved, the heating load of the condenser is effectively reduced, and therefore the overall performance coefficient of the cascade type heat pump is improved.

Methods for forming an improved, centralized refrigeration systems by: (a) providing an existing refrigeration circuit with an existing high GWP refrigerant; (b) disconnecting the fluid connection between the existing refrigerant liquid from the condenser and the evaporators; (c) disconnecting the fluid connection between the existing refrigerant vapor from the evaporators and the compressor suction; (d) establishing a new first refrigeration circuit comprising the compressor and the condenser; (e) establishing a new second refrigeration circuit comprising the evaporators by removing existing refrigerant from the evaporators and the disconnected conduits and replacing the removed refrigerant with a second refrigerant comprising at least 50% of R1234ze(E) and being Class Al and having an OEL greater than 400 and a GWP of about 150 or less; and thermally interconnecting the new first refrigeration circuit and the new second refrigeration circuit with an inter-circuit heat exchanger.

A refrigerant circuit includes a first compressor connected to a first suction pipe and a first discharge pipe and configured to compress a refrigerant, a second compressor connected to a second suction pipe and a second discharge pipe and configured to compress the refrigerant discharged from the first compressor, a radiator, and a high-pressure passage connecting the second discharge pipe and the radiator. A first oil drain passage guides an oil in the second compressor to one of the first suction pipe and an intermediate port of the first compressor, without via the high-pressure passage.