Compression-injection heat pump

Abstract

The invention provides a compression-injection type heat pump, and belongs to the technical field of refrigeration and heat pumps. The system mainly comprises a compressor, a heat supply device, an ejector, a condenser, a throttle valve and an evaporator, the compressor is communicated with a high-pressure steam inlet of the ejector through a high-pressure cycle working medium channel via a heat supplier, the evaporator is communicated with a low-pressure steam inlet of the ejector through a low-pressure cycle working medium channel, the ejector is communicated with the compressor and the condenser through a medium-pressure cycle working medium channel, and the condenser is communicated with the evaporator through a cycle working medium channel via a throttle valve. The heat supply device is communicated with the outside through a heated medium channel, the condenser is communicated with the outside through a cooling medium channel, the evaporator is communicated with the outside through a refrigerated medium channel, and the compression-jet type heat pump is formed.

Description

Technical fields:

[0001] This invention belongs to the field of thermodynamics and heat pump technology. Background technology:

[0002] Vapor compression heat pump technology, which uses mechanical energy as its driving force, is one of the most widely used cooling / heating technologies. In some cases, industrial users require both cooling and heating simultaneously, with higher heating temperatures; in such cases, a compressor with a high compression ratio is needed.

[0003] How to reduce the compression ratio of the compressor is the first problem that those skilled in the art need to consider and solve; in addition, from the perspective of heating, making full use of high-quality low-temperature heat resources can help improve the efficiency and value of driving energy utilization.

[0004] An ejector is a pressure-boosting component that has the advantages of simple structure, reliable operation, low investment and long service life; in addition, compared with a compressor, an ejector is more adaptable to the compression of wet steam.

[0005] Based on comprehensive considerations and adhering to the principles of simple, proactive, and efficient utilization of mechanical energy for refrigeration / heating, this invention proposes a compression-ejector heat pump that uses mechanical energy as the driving energy source, complements each other's advantages, has a reasonable process, a simple structure, and excels in combined cooling and heating. Summary of the Invention:

[0006] The main objective of this invention is to provide a compression-ejection heat pump, and the specific contents of the invention are described in detail below:

[0007] 1. A compression-ejector heat pump mainly consists of a compressor, a heater, an ejector, a condenser, a throttling valve, and an evaporator. The compressor has a high-pressure circulating working fluid channel that connects to the high-pressure steam inlet of the ejector after passing through the heater. The evaporator has a low-pressure circulating working fluid channel that connects to the low-pressure steam inlet of the ejector. The ejector also has a medium-pressure circulating working fluid channel that connects to both the compressor and the condenser. The condenser also has a circulating working fluid channel that connects to the evaporator via the throttling valve. The heater also has a channel for the heated medium that connects to the outside, the condenser has a channel for the cooled medium that connects to the outside, and the evaporator has a channel for the cooled medium that connects to the outside, thus forming a compression-ejector heat pump.

[0008] 2. A compression-ejection heat pump is formed by adding a nozzle and replacing the throttle valve in the compression-ejection heat pump described in item 1.

[0009] 3. A compression-ejector heat pump is a compression-ejector heat pump described in item 1, in which a two-phase expander is added and replaces the throttle valve. The two-phase expander is connected to the compressor and transmits power to form a compression-ejector heat pump. Attached image description:

[0010] Figure 1 This is a principle thermodynamic system diagram of a compression-ejection heat pump provided by the present invention.

[0011] Figure 2 This is a second principle thermodynamic system diagram of a compression-ejection heat pump provided by the present invention.

[0012] Figure 3 This is a third principle thermodynamic system diagram of a compression-ejection heat pump provided by the present invention.

[0013] In the diagram, 1-compressor, 2-heater, 3-ejector, 4-condenser, 5-throttle valve, 6-evaporator, 7-nozzle, 8-two-phase expander; among them, by adjusting the operating parameters, the condenser provides a suitable heating load to the outside.

[0014] It should be pointed out here that:

[0015] (1) The steam at the ejector outlet is mostly wet steam, but it can also be saturated steam or superheated steam; for the sake of convenience, steam is used to describe it.

[0016] (2) Two-phase expander refers to an expander that can operate in a two-phase region (e.g., the inlet is liquid phase and the outlet is two phases; or both the inlet and the outlet are two phases; or the inlet is gas phase and the outlet is two phases); including but not limited to screw expanders, as well as certain piston expanders, rotor expanders, water turbines, turbines, etc. Detailed implementation method:

[0017] First, it should be noted that the structure and process are not repeated unless necessary, and obvious processes are not described. The invention will now be described in detail with reference to the accompanying drawings and examples.

[0018] Figure 1 The compression-ejection heat pump shown is implemented as follows:

[0019] (1) Structurally, it is mainly composed of a compressor, a heater, an ejector, a condenser, a throttle valve and an evaporator; the compressor 1 has a high-pressure circulating working fluid channel that connects to the high-pressure steam inlet of the ejector 3 after passing through the heater 2; the evaporator 6 has a low-pressure circulating working fluid channel that connects to the low-pressure steam inlet of the ejector 3; the ejector 3 also has a medium-pressure circulating working fluid channel that connects to the compressor 1 and the condenser 4 respectively; the condenser 4 also has a circulating working fluid channel that connects to the evaporator 6 through the throttle valve 5; the heater 2 also has a heated medium channel that connects to the outside; the condenser 4 also has a cooling medium channel that connects to the outside; and the evaporator 6 also has a refrigerated medium channel that connects to the outside.

[0020] (2) In terms of process, the high-pressure circulating working fluid discharged by the compressor 1 flows through the heater 2 to release heat and cool down into saturated or wet saturated steam, and then provides it to the ejector 3 as driving steam (working steam); the working steam enters the ejector 3, flows through the nozzle to reduce pressure and increase speed and form low pressure, and the steam generated by the evaporator 6 is drawn into the low-pressure zone of the ejector 3. After the two steams are mixed, they flow through the diffuser to reduce speed and increase pressure to form medium-pressure steam. The medium-pressure steam discharged by the ejector 3 is divided into two paths - the first path enters the compressor 1 to increase pressure and temperature, and the second path enters the condenser 4 to release heat and condense; the condensate discharged by the condenser 4 flows through the throttle valve 5 to reduce pressure and temperature and then enters the evaporator 6 to absorb heat and vaporize; the heated medium obtains high-temperature heat load through the heater 2, the cooling medium takes away the cooling heat load through the condenser 4, and the refrigerated medium (low-temperature heat medium) is provided with low-temperature heat load through the evaporator 6. The external provides power to the compressor 1, forming a compression-ejection heat pump.

[0021] Figure 2 The compression-ejection heat pump shown is implemented as follows:

[0022] exist Figure 1 In the compression-ejection heat pump shown, a nozzle 7 is added and replaces the throttle valve 5; the condensate discharged from the condenser 4 flows through the nozzle 5 to reduce pressure and increase speed, and then enters the evaporator 6 to absorb heat and vaporize, thus forming a compression-ejection heat pump.

[0023] Figure 3 The compression-ejection heat pump shown is implemented as follows:

[0024] exist Figure 1 In the compression-ejection heat pump shown, a two-phase expander 8 is added and replaces the throttle valve 5. The two-phase expander 8 is connected to the compressor 1 and transmits power. The condensate discharged from the condenser 4 flows through the two-phase expander 8 to reduce pressure and do work, and then enters the evaporator 6 to absorb heat and vaporize. The work output by the two-phase expander 8 is provided to the compressor 1 to do power, thus forming a compression-ejection heat pump.

[0025] The effects achievable by this invention—the compression-ejection heat pump proposed in this invention has the following effects and advantages:

[0026] (1) To achieve deep utilization of low temperature heat load, deep cooling, and large temperature rise combined cooling and heating supply.

[0027] (2) When supplying both cooling and heating, the machine can be used for two purposes, achieving efficient cooling and high-temperature heating, and improving the efficiency and economy of mechanical energy utilization.

[0028] (3) The injector and the compressor work together to pressurize the circulating working fluid, which reduces the compression ratio of the pressurization process completed by the compressor, which is beneficial to improving the performance index of the heat pump.

[0029] (4) The ejector is simple and durable to manufacture, which helps to reduce the manufacturing cost of compression-ejection heat pumps.

[0030] (5) Compared with compressors, ejectors have less irreversible loss, which is beneficial to improving the performance index of compression-ejection heat pumps.

Claims

1. A compression-ejector heat pump is mainly composed of a compressor, a heater, an ejector, a condenser, a throttle valve, and an evaporator. The compressor (1) has a high-pressure circulating working fluid channel that connects to the high-pressure steam inlet of the ejector (3) after passing through the heater (2). The evaporator (6) has a low-pressure circulating working fluid channel that connects to the low-pressure steam inlet of the ejector (3). The ejector (3) also has a medium-pressure circulating working fluid channel that connects to the compressor (1) and the condenser (4) respectively. The condenser (4) also has a circulating working fluid channel that connects to the evaporator (6) through the throttle valve (5). The heater (2) also has a heated medium channel that connects to the outside. The condenser (4) also has a cooling medium channel that connects to the outside. The evaporator (6) also has a cooled medium channel that connects to the outside, thus forming a compression-ejector heat pump.

2. A compression-ejection heat pump is formed by adding a nozzle (7) and replacing the throttle valve (5) in the compression-ejection heat pump according to claim 1.

3. A compression-ejection heat pump is a compression-ejection heat pump according to claim 1, wherein a two-phase expander (8) is added and replaces the throttle valve (5), the two-phase expander (8) is connected to the compressor (1) and transmits power, thus forming a compression-ejection heat pump.

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