CN210463660U

CN210463660U - Ultra-low temperature air source heat pump unit with parallel compressors

Info

Publication number: CN210463660U
Application number: CN201921382521.2U
Authority: CN
Inventors: 武晓宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-24
Filing date: 2019-08-24
Publication date: 2020-05-05
Anticipated expiration: 2029-08-24

Abstract

The utility model discloses an ultra-low temperature air source heat pump unit with parallel compressors, which comprises a cabinet, wherein a heat exchanger is fixed in the cabinet, an axial flow fan is arranged at the top of the heat exchanger, and a condenser is arranged in the cabinet; an electric cabinet and a parallel compressor assembly are arranged in the cabinet; the parallel compressor assembly is connected with the vapor-liquid separator and the four-way valve, and other three interfaces of the four-way valve are respectively connected with the vapor-liquid separator, the condenser and the heat exchanger; the heat exchanger is close to axial fan setting, and the heat exchanger rear end is connected to an organic whole with the combination valve body, and the bottom and the condenser of combination valve body are connected to an organic whole. When the device is started, the quantity of the compressors to be loaded is calculated through temperature difference to adjust energy. When no energy loading requirement exists, the energy regulation in normal operation is directly carried out; when energy loading is required, one compressor is started every 4 seconds, and an environment-friendly refrigerant is used, so that the ozone layer is not damaged; the economical efficiency is good, and the total cost of the heat exchanger can be reduced by about 20 percent.

Description

Ultra-low temperature air source heat pump unit with parallel compressors

Technical Field

The utility model relates to a central air conditioning and domestic freezing, heating and hot water system specifically say an ultralow temperature air source heat pump set of parallelly connected compressor.

Background

At present, in northern areas of China, domestic hot water is mainly obtained in cold winter by coal, fuel oil, fuel gas, a heat pump unit and electric heating, and the existing mode for obtaining hot water has the defects and is mainly embodied in the following aspects:

1. high energy consumption and no environmental protection; the coal is adopted, so that the pollution to air is serious; the energy consumption is high by adopting gas, fuel oil or electric heating, and the heat-conducting agent of the common heat pump unit, such as substances containing fluorine, is harmful to the ozone layer.

2. The heat-conducting agent of the existing common air source heat pump unit has high solidification point, slower cooling speed in unit time and large isentropic compression ratio work, so that the compressor is difficult to work and is not beneficial to the service life of the compressor.

3. And low-temperature environment heating cannot be realized.

4. The air source heat pump unit only runs under full load for a short time, and runs under partial load for most of time, one compressor of the common air source heat pump unit corresponds to one unit heat exchanger to form an independent refrigerating system, when the compressor is stopped, the heat exchanger does not work, the heat exchanger can only work under the full load corresponding to the compressor, so that the condensing temperature is higher and the evaporating temperature is lower, the unit is enabled to work under a lower energy efficiency ratio all the time, and a large amount of energy is wasted.

How to carry out effectual improvement through carrying out current ordinary air source heat pump set, can make it when partial load is worked, effectively utilize the heat transfer area of whole heat exchangers for condensing temperature reduces by a wide margin, and evaporating temperature improves by a wide margin, thereby improves unit heating comprehensive part load coefficient of performance IPLV by a wide margin, reaches energy saving and consumption reduction's target. The above technical problems to be improved by technical personnel in the industry are needed.

Disclosure of Invention

The problem that exists to prior art, the utility model aims at providing a parallelly connected compressor ultralow temperature air source heat pump set through technical improvement, can reach higher unit operation and heat comprehensive part load coefficient of performance IPLV to can effectively reduce the energy consumption, pollution-free to the environment, use cost is low, is favorable to the compressor function and can realize the efficiency of heating under the low temperature environment.

In order to realize the purpose, the utility model discloses a technical scheme as follows: an ultra-low temperature air source heat pump unit with parallel compressors comprises a cabinet, wherein a heat exchanger is fixed in the cabinet, an axial flow fan is installed at the top of the heat exchanger, and a condenser is installed below the heat exchanger in the cabinet; an electric cabinet and a parallel compressor assembly are arranged in the cabinet; the parallel compressor assembly is connected with the vapor-liquid separator and the four-way valve, and the other three interfaces of the four-way valve are respectively connected with the vapor-liquid separator, the condenser and the heat exchanger; the heat exchanger is arranged close to the axial flow fan, the rear end of the heat exchanger and the combined valve body are connected into a whole, and the bottom of the combined valve body and the condenser are connected into a whole; the left end and the right end of the combined valve body are connected with the reservoir and the filter to form a circulation loop.

A liquid spraying pipeline module is additionally arranged between each compressor and the liquid condensing pipeline and comprises a plurality of copper pipes connected with the electromagnetic valve, the liquid spraying valve and the compressor, a junction box controller for controlling the opening, closing and opening of the liquid spraying valve and an exhaust temperature sensor fixed on an exhaust pipe of the compressor.

The parallel compressor assembly consists of a plurality of compressors; the parallel connection mode is as follows: the exhaust pipes of all the compressors are connected to the same exhaust pipe; the air return pipes of all the compressors are also connected to the same air return pipe together; the oil pools of each compressor are connected with each other by the same oil balance pipe.

The combined valve body comprises two one-way valves and two throttle valves, wherein a series branch is formed by one-way valve and one throttle valve, and the two series branches are connected in parallel to form the combined valve body; the throttle valve adopts a thermal expansion valve or an electronic expansion valve or a capillary tube.

The utility model has the advantages that: the utility model can use the parallel compressor components through research and improvement, and the beneficial effect is 1. the environmental protection refrigerant is used, the ozone layer is not damaged; the economical efficiency is good, and the total cost of the heat exchanger can be reduced by about 20 percent; 3. the high-efficiency energy-saving air conditioning unit has the advantages of high efficiency, energy saving, low liquid density, high steam density and high latent heat of vaporization, so that the unit has higher cold quantity under the same frame. A smaller pressure drop in the heat exchanger results in a lower condensing temperature and a higher evaporating temperature, so that the system obtains a higher heating integrated part load performance coefficient IPLV; the operation energy consumption is reduced by about 30 percent. The isentropic compression ratio work is small, so that the compressor can work more easily, the service life of the compressor is prolonged, the molecular weight is small, the fluidity is good, the conveying pressure is lower, and the load of the compressor is reduced; 4. low-temperature environment heating and high-temperature environment hot water production, and domestic hot water and heating can be produced at the lowest environment temperature of-30 ℃.

Drawings

The invention will be further described with reference to the accompanying drawings:

fig. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

fig. 3 is a schematic bottom view of the present invention;

FIG. 4 is a schematic diagram of the system of the present invention;

in the drawing, the heat exchanger comprises a finned heat exchanger 1, a finned heat exchanger 2, an axial flow fan 3, a cabinet 4, a condenser 5, a liquid storage device 6, a gas-liquid separator 7, a parallel compressor assembly 71, an electromagnetic valve 72, a liquid spraying valve 73, a copper pipe 74, a junction box controller 75, an exhaust temperature sensor 76, a compressor 77, an exhaust pipe 78, a return pipe 8, an electric cabinet 9, a four-way valve 10, a filter 11, a one-way valve 12 and a throttle valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only.

An ultra-low temperature air source heat pump unit with parallel compressors is shown in the attached drawing, the outer frame of the heat pump unit is the same as that of the existing common heat pump unit in structure, the heat pump unit comprises a cabinet 3, a fin heat exchanger 1 is fixed inside the cabinet 3, an axial flow fan 2 is installed at the top of the fin heat exchanger 1, and a condenser 4 is installed inside the cabinet 3 and below the heat exchanger 1; an electric cabinet 8 and a parallel compressor assembly 7 are arranged in the cabinet 3; the parallel compressor assembly 7 is connected with the vapor-liquid separator 6 and the four-way valve 9, and the other three interfaces of the four-way valve 9 are respectively connected with the vapor-liquid separator 6, the condenser 4 and the fin heat exchanger 1; the finned heat exchanger 1 is arranged close to the axial flow fan 2, the rear end of the finned heat exchanger 1 is connected with the combined valve body into a whole, and the bottom of the combined valve body is connected with the finned condenser 1 into a whole; the left end and the right end of the combined valve body are connected with the liquid reservoir 5 and the filter 10 to form a circulation loop;

as shown in fig. 4, the combined valve body comprises two check valves 11 and two throttle valves 12, wherein a series branch is formed by one check valve 11 and one throttle valve 12, and the two series branches are connected in parallel to form the combined valve body; because the compressor of the unit is higher in working pressure when fully opened, the throttle valve 12 is a high-pressure-resistant thermal throttle valve or an electronic throttle valve, and the electronic throttle valve is preferably selected under the frequency conversion setting.

The research and development of the utility model focus on the use of the parallel compressor component 7, as shown in fig. 4, the parallel compressor component is set up by more than two independent compressors in parallel, the utility model discloses use four compressors to connect in parallel as an example to explain, the blast pipe of each compressor 76 is connected on the same blast pipe 77 together; the return pipes 78 of each compressor 76 are also commonly connected to the same return pipe 78; the oil sumps 80 of each compressor are connected to each other by the same oil balance pipe 79; the right side of the parallel compressor component is provided with a gas-liquid separator 6 and a liquid accumulator 5, in order to adapt to the liquid spraying circulation operation of the environment-friendly refrigerant, 1 liquid spraying pipeline module 7 specially designed for matching the circulation of the liquid spraying refrigerant is additionally arranged between each compressor 76 and the liquid condensing pipeline, and the liquid spraying pipeline modules 7 equipped on each compressor have the same structure and the specific connection mode is as follows:

an electromagnetic valve 71 is connected to a copper pipe 73, a liquid spraying valve 72 is arranged behind the electromagnetic valve 71, the liquid spraying valve 72 is connected with a compressor 76 through the copper pipe 73, the compressor 76 is connected with an external gas-liquid separator 6 and an external four-way valve 9 through the copper pipe 73, an exhaust temperature sensor 75 is fixed on a pipeline connecting the four-way valve 9 with the compressor 76, the exhaust temperature sensor 75 is connected with the liquid spraying valve 72 through a wiring box controller 74 through a wire, and the compressor 76 is fixed with a wiring box controller 74.

The utility model discloses a theory of operation is: when the utility model works, a small part of high-pressure refrigerant liquid is branched from the copper pipe 73 led out from the condensation pipeline and enters the liquid spraying port of the compressor 76 through the liquid spraying valve 72 after passing through the electromagnetic valve 71, and then enters the middle cavity of the scroll compressor 76 to be effectively cooled and reduce the exhaust temperature, the liquid spraying pipeline module 7 is connected with the vapor-liquid separator 6 and the external four-way valve 9 through pipelines, the pipeline connected with the compressor 76 through the four-way valve 9 is fixed with an exhaust temperature sensor 75, the exhaust temperature sensor 75 is connected with the liquid spraying valve 72 through a wire of the junction box controller 74, and the compressor 76 is fixed with the junction box controller 74 which has the function of controlling the liquid spraying amount of the liquid spraying valve 72 sprayed into the middle cavity of the scroll plate of the compressor 76 through the exhaust temperature sensor 75, the four-way valve 9 is connected with the external fin heat exchanger 1 and the condenser 4, and is the same as, the whole refrigerating or heating process is completed by the cooperation between the check valve 11 and the throttle valve 12 and between the reservoir and the filter.

Example (b): when the device is started, the quantity of the compressors to be loaded is calculated through temperature difference to adjust energy.

When no energy loading requirement exists, the energy regulation in normal operation is directly carried out; when energy loading is required, one compressor is started every 4 seconds, the time period of every 4 seconds is used as a control period, and the energy adjustment during normal operation is carried out after the number of started compressors reaches the number of required compressors.

Energy during normal operation adjusts through the temperature zone, the utility model discloses set up the temperature zone into four, do respectively: loading, holding, unloading and scramming.

When the control temperature is set in the loading area, loading one energy level, namely loading one compressor to work, every time of one control period, until all the compressors are completely loaded; when the control temperature is in the energy holding area, the current energy level is maintained, namely the current number and working state of the compressors are maintained; when the control temperature is in the energy unloading area, unloading one energy level, namely reducing the work of one compressor, every time one control cycle is passed until all the energy is unloaded; in special cases, when the control temperature is in the scram zone, it is set to unload one compressor every 1 second until all compressors are unloaded.

For the above-mentioned considerations of the compressor operation in the two temperature zones of loading and unloading:

① Loading

If there are both already operating and non-operating compressors in a group, the compressors in the group that are not operating are preferentially loaded. If all the compressors in the group are operated or not operated, the compressor load with the shortest accumulated operation time is selected in the whole group.

② unloading

If there are both already operating and non-operating compressors in a group, the compressors in the group that are already operating are preferentially unloaded. If all the compressors in the group are operated or not operated, the compressor unloading with the longest accumulated operation time is selected in the whole group.

The purpose of the above arrangement is to equalize the operation time of each compressor, prevent the deviation of the use frequency among the compressors, and prevent the fault caused by excessive use of a single compressor from further influencing the operation of the whole compressor combination.

Claims

1. An ultra-low temperature air source heat pump unit with parallel compressors comprises a cabinet, wherein a heat exchanger is fixed in the cabinet, an axial flow fan is installed at the top of the heat exchanger, and a condenser is installed below the heat exchanger in the cabinet; the method is characterized in that: an electric cabinet and a parallel compressor assembly are arranged in the cabinet; the parallel compressor assembly is connected with the vapor-liquid separator and the four-way valve, and the other three interfaces of the four-way valve are respectively connected with the vapor-liquid separator, the condenser and the heat exchanger; the heat exchanger is arranged close to the axial flow fan, the rear end of the heat exchanger and the combined valve body are connected into a whole, and the bottom of the combined valve body and the condenser are connected into a whole; the left end and the right end of the combined valve body are connected with the reservoir and the filter to form a circulation loop.

2. The parallel compressor ultra-low temperature air source heat pump unit of claim 1, characterized in that: a liquid spraying pipeline module is additionally arranged between each compressor and the liquid condensing pipeline and comprises a plurality of copper pipes connected with the electromagnetic valve, the liquid spraying valve and the compressor, a junction box controller for controlling the opening, closing and opening of the liquid spraying valve and an exhaust temperature sensor fixed on an exhaust pipe of the compressor.

3. The parallel compressor ultra-low temperature air source heat pump unit of claim 1, characterized in that: the parallel compressor assembly consists of a plurality of compressors; the parallel connection mode is as follows: the exhaust pipes of all the compressors are connected to the same exhaust pipe; the air return pipes of all the compressors are also connected to the same air return pipe together; the oil pools of each compressor are connected with each other by the same oil balance pipe.

4. The parallel compressor ultra-low temperature air source heat pump unit of claim 1, characterized in that: the combined valve body comprises two one-way valves and two throttle valves, wherein a series branch is formed by one-way valve and one throttle valve, and the two series branches are connected in parallel to form the combined valve body; the throttle valve adopts a thermal expansion valve or an electronic expansion valve or a capillary tube.