A two-pipe heat recovery direct expansion air conditioning unit
By setting up an indoor unit reheating condenser in a direct expansion air conditioner unit, condensation heat is recycled and used for reheating or providing hot water, the problems of waste of condensation heat and high reheating energy consumption are solved, the recovery and utilization of heat energy is realized, and building energy consumption and carbon emissions are reduced.
Patent Information
- Application Number
- CN202421275255.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-05
AI Technical Summary
When the direct expansion air conditioner unit is refrigerated, a large amount of condensation heat generated by the condenser is directly discharged to the outdoors, resulting in waste of heat energy and additional electricity consumption is required in situations where reheating is required, increasing building energy consumption.
A two-pipe heat recovery direct expansion air conditioning unit is designed. By setting up an indoor unit reheating condenser in the indoor unit, the condensation heat is recovered and used for indoor reheating or providing hot water, so as to achieve the recycling and utilization of heat energy.
By recycling condensation heat, the need to consume additional electricity in situations where reheating is required is reduced, the energy consumption and carbon emissions of buildings are reduced, and the energy utilization efficiency is improved, maintaining the stability of the indoor environment.
Smart Images
Figure CN222738418U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of central air conditioning, in particular to a two-pipe heat recovery direct expansion air conditioning unit. Background Art
[0002] As a common cooling and heating equipment in modern buildings, direct expansion air conditioners are widely used in various occasions, such as public places such as office buildings, commercial centers, hospitals, schools, and civil buildings such as residences. Its working principle is mainly to use the refrigerant to evaporate and absorb heat in the evaporator, thereby achieving the effect of cooling; while in the condenser, the refrigerant releases heat and condenses into liquid, completing a refrigeration cycle. For the heating function, the direct expansion air conditioner changes the flow direction of the refrigerant by switching the four-way valve, thereby achieving indoor temperature increase.
[0003] However, despite the advantages of direct expansion air conditioning units such as wide use, strong site adaptability, and high cooling and heating efficiency, there are still some shortcomings in the actual operation process. One of the most prominent problems is that during cooling operation, a large amount of condensation heat generated by the condenser is often directly discharged to the outdoor environment, which not only causes a huge waste of heat energy, but also requires additional electricity for heating in some occasions where reheating is required, thereby greatly increasing the energy consumption of the building. Especially in some places with high requirements for indoor environment, such as constant temperature and humidity laboratories, data centers, etc., in order to ensure the stability of the indoor environment, it is often necessary to frequently start the refrigeration and reheating equipment, which not only increases energy consumption, but also may cause large fluctuations in indoor temperature, affecting the normal operation and service life of the equipment. Utility Model Content
[0004] In view of the defects in the prior art, the utility model provides a two-pipe heat recovery direct expansion air-conditioning unit, which solves the problem that the condensation heat of the direct expansion air-conditioning unit cannot be recovered and utilized, and does not increase the number of connecting pipes of the original system.
[0005] A two-pipe heat recovery direct expansion air-conditioning unit, comprising an outdoor unit and an indoor unit; wherein the outdoor unit comprises a compressor, an electromagnetic four-way reversing valve, an outdoor unit condenser, a fan, a first one-way valve, a liquid reservoir, and a first electronic expansion valve; the electromagnetic four-way reversing valve comprises a first joint, a second joint, a third joint, and a fourth joint; the first joint and the second joint are respectively connected to the inlet and outlet of the compressor; the third joint is connected to the outdoor unit condenser; the outdoor unit condenser is directly opposite to the fan; the outdoor unit condenser is connected to the first one-way valve; the first one-way valve is connected to the liquid reservoir; the first electronic expansion valve The expansion valve is connected in parallel with the first one-way valve; the indoor unit includes a second electronic expansion valve, an indoor unit evaporator and a second one-way valve, the second electronic expansion valve is connected to the liquid reservoir through a refrigerant connecting pipe 1, the second electronic expansion valve is connected to the indoor unit evaporator, the indoor unit evaporator is connected to the fourth joint through a refrigerant connecting pipe 2, and the second one-way valve is connected in parallel with the second electronic expansion valve; the indoor unit also includes an indoor unit reheat condenser, a solenoid valve and a third electronic expansion valve, the solenoid valve and the indoor unit reheat condenser are connected to each other, and the solenoid valve and the indoor unit reheat condenser are connected in parallel with the second one-way valve.
[0006] Preferably, the indoor unit reheat condenser is also connected to a third electronic expansion valve, and the solenoid valve, the indoor unit reheat condenser and the third electronic expansion valve are connected in parallel with the second one-way valve. The indoor unit reheat condenser is not only used to recover condensation heat, but also to adjust the flow and pressure of the refrigerant through the control of the third electronic expansion valve, thereby achieving more precise temperature control. The function of the solenoid valve is to cut off the refrigerant passage of the indoor unit reheat condenser when reheating is not required, thereby avoiding unnecessary energy consumption. The parallel setting ensures that the refrigerant can flow smoothly in different working modes, thereby improving the flexibility and efficiency of the system.
[0007] Preferably, the first electronic expansion valve is connected to a first filter, and the first electronic expansion valve and the first filter are connected in parallel with the first one-way valve. The first electronic expansion valve is used to control the flow rate and pressure of the refrigerant flowing from the liquid reservoir to the indoor unit, so as to achieve precise temperature control in the heating mode. The function of the first filter is to filter out impurities and particulate matter in the refrigerant to prevent them from damaging or clogging other components in the system (such as the compressor, condenser, etc.). The parallel setting ensures that the refrigerant can be accurately controlled and kept clean during the process of flowing to the indoor unit.
[0008] Preferably, the second electronic expansion valve is connected to a second filter, and the second electronic expansion valve and the second filter are connected in parallel with the second one-way valve. The second electronic expansion valve is also used to control the flow and pressure of the refrigerant, but here it mainly acts before the indoor unit evaporator to ensure that the refrigerant has a suitable state when entering the evaporator. The function of the second filter is to further filter the refrigerant to prevent any possible impurities or particulate matter from entering the indoor unit evaporator, thereby protecting the performance and life of the evaporator. The parallel setting enhances the system's ability to control and protect the flow of refrigerant.
[0009] Preferably, a gas-liquid separator is provided between the second joint and the compressor. The gas-liquid separator is provided at the inlet of the compressor, which can effectively separate the liquid part of the refrigerant and ensure that only gaseous refrigerant enters the compressor. This helps to prevent the compressor from being damaged by the impact of the liquid refrigerant, and also helps to improve the efficiency and life of the compressor.
[0010] The beneficial effects of the utility model are embodied in:
[0011] In the utility model, by setting up an indoor unit reheat condenser, this part of condensation heat can be recovered during refrigeration operation and used for indoor reheating or providing hot water, etc., thereby realizing the recovery and utilization of heat energy and improving energy utilization efficiency; further, since the technical solution realizes the recovery and utilization of heat energy, it can reduce the situation of additional consumption of electric energy for heating in occasions where reheating is required, thereby reducing the energy consumption and carbon emissions of the building, which is beneficial to energy conservation and emission reduction. In some places with high requirements for indoor environment, such as constant temperature and humidity laboratories, data centers, etc., traditional direct expansion air-conditioning units may need to frequently start refrigeration and reheating equipment, which not only increases energy consumption, but also may cause large fluctuations in indoor temperature. The technical solution can reduce the frequent start-up of refrigeration and reheating equipment by recovering condensation heat for reheating, which is beneficial to maintaining the stability of the indoor environment; further, through the setting of solenoid valves and multiple electronic expansion valves, the technical solution can flexibly switch between refrigeration, heating and reheating modes according to actual needs to meet the needs of different occasions. At the same time, since the system adopts a two-pipe design, installation and maintenance are easier. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Reference numerals:
[0015] 1- compressor, 2- gas-liquid separator, 3- electromagnetic four-way reversing valve, 31- first connector, 32- second connector, 33- third connector, 34- fourth connector, 4- outdoor unit condenser, 5- fan, 6- first non-return valve, 7- first electronic expansion valve, 8- first filter, 9- liquid storage tank, 10- refrigerant connecting pipe 1, 11- refrigerant connecting pipe 2, 12- second filter, 13- second electronic expansion valve, 14- electromagnetic valve, 15- indoor unit reheat condenser, 16- second non-return valve, 17- third electronic expansion valve, 18- indoor unit evaporator. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0018] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0019] like Figure 1As shown, a two-pipe heat recovery direct expansion air-conditioning unit includes an outdoor unit and an indoor unit; wherein the outdoor unit includes a compressor 1, an electromagnetic four-way reversing valve 3, an outdoor unit condenser 4, a fan 5, a first one-way valve 6, a liquid reservoir 9, and a first electronic expansion valve 7, the electromagnetic four-way reversing valve 3 includes a first joint 31, a second joint 32, a third joint 33 and a fourth joint 34, the first joint 31 and the second joint 32 are respectively connected to the inlet and outlet of the compressor 1, the third joint 33 is connected to the outdoor unit condenser 4, the outdoor unit condenser 4 is directly opposite to the fan 5, the outdoor unit condenser 4 is connected to the first one-way valve 6, the first one-way valve 6 is connected to the liquid reservoir 9, the first electronic expansion valve 7 is connected to the first one-way valve 6, the first one-way valve 6 is connected to the liquid reservoir 9, and the first electronic expansion valve 7 is connected to the first one-way valve 6. The second one-way valves 16 are connected in parallel with each other; the indoor unit includes a second electronic expansion valve 13, an indoor unit evaporator 18 and a second one-way valve 16, the second electronic expansion valve 13 is connected to the liquid storage tank 9 through a refrigerant connecting pipe 10, the second electronic expansion valve 13 is connected to the indoor unit evaporator 18, the indoor unit evaporator 18 is connected to the fourth joint 34 through a refrigerant connecting pipe 2 11, and the second one-way valve 16 and the second electronic expansion valve 13 are connected in parallel with each other; the indoor unit also includes an indoor unit reheat condenser 15, a solenoid valve 14 and a third electronic expansion valve 17, the solenoid valve 14 and the indoor unit reheat condenser 15 are connected to each other, and the solenoid valve 14 and the indoor unit reheat condenser 15 are connected in parallel with the second one-way valve 16.
[0020] In this embodiment, it should be noted that when the entire device is running refrigeration, the refrigerant discharged from the compressor 1 passes through the first joint 31 and the third joint 33 of the electromagnetic four-way reversing valve 3, enters the outdoor unit condenser 4, exchanges heat with the outdoor air through the operation of the fan 5, enters the liquid storage tank 9 through the first one-way valve 6, and enters the indoor unit through the refrigerant connecting pipe 10. At this time, the solenoid valve 14 is in a closed state, and the refrigerant enters the second electronic expansion valve 13 for throttling. The throttled refrigerant enters the indoor unit evaporator 18 for heat absorption and evaporation, wherein the air temperature passing through the indoor unit evaporator 18 is reduced, and then the refrigerant enters the fourth joint 34 of the electromagnetic four-way reversing valve 3 through the refrigerant connecting pipe 2 11, and then returns to the compressor 1 through the second joint 32, completing the refrigeration cycle;
[0021] When the whole equipment is running for heating, the refrigerant discharged from the compressor 1 passes through the electromagnetic four-way reversing valve 3, and enters the indoor unit evaporator 18 through the refrigerant connecting pipe 11, wherein the indoor unit evaporator can transfer the condensation heat to the indoor air, and returns to the outdoor unit through the second one-way valve 16 and the refrigerant connecting pipe 10. The refrigerant enters the first electronic expansion valve 7 after entering the liquid storage tank 9, and enters the outdoor unit condenser 4 after throttling. After the refrigerant evaporates, it returns to the compressor 1 through the electromagnetic four-way reversing valve 3 to complete the heating cycle;
[0022] When the whole equipment is running for refrigeration, heating and recovery, the refrigerant discharged from the compressor 1 passes through the electromagnetic four-way reversing valve 3 and enters the outdoor unit condenser 4. The fan 5 stops running or runs at a low speed. The refrigerant that is not completely condensed passes through the first one-way valve 6 and enters the liquid storage tank 9, and enters the indoor unit through the refrigerant connecting pipe 10. At this time, the solenoid valve 14 is in the open state, and the second electronic expansion valve 13 is closed. The refrigerant enters the indoor unit reheat condenser 15 for condensation and heat release, wherein the heated reheat is used for indoor reheating or providing hot water. Then the refrigerant enters the evaporator after throttling by the third electronic expansion valve 17 for heat absorption and evaporation, and then enters the electromagnetic four-way reversing valve 3 through the refrigerant connecting pipe 2 11, and returns to the compressor 1 to complete the refrigeration heat recovery cycle.
[0023] In summary, in the entire two-pipe heat recovery direct expansion air-conditioning unit, in the traditional direct expansion air-conditioning unit, a large amount of condensation heat generated by the condenser is often directly discharged to the outside during cooling operation, resulting in a waste of heat energy. However, the present technical solution can recover this part of condensation heat during cooling operation by setting up an indoor unit reheat condenser 15, and use it for indoor reheating or providing hot water, thereby realizing the recovery and utilization of heat energy and improving energy utilization efficiency; further, since the present technical solution realizes the recovery and utilization of heat energy, it can reduce the situation of additional consumption of electric energy for heating in occasions where reheating is required, thereby reducing the energy consumption and carbon emissions of the building, which is beneficial to energy conservation and emission reduction. In places with high requirements for indoor environment, such as constant temperature and humidity laboratories, data centers, etc., traditional direct expansion air-conditioning units may need to frequently start the refrigeration and reheating equipment, which not only increases energy consumption, but may also cause large fluctuations in indoor temperature. The present technical solution can reduce the frequent start-up of refrigeration and reheating equipment by recovering condensation heat for reheating, which is beneficial to maintaining the stability of the indoor environment; further, through the setting of the solenoid valve 14 and multiple electronic expansion valves, the present technical solution can flexibly switch the refrigeration, heating and reheating modes according to actual needs to meet the needs of different occasions. At the same time, since the system adopts a two-pipe design, installation and maintenance are easier.
[0024] Specifically, the indoor unit reheat condenser 15 is further connected to a third electronic expansion valve 17 , and the solenoid valve 14 , the indoor unit reheat condenser 15 and the third electronic expansion valve 17 are connected in parallel with the second check valve 16 .
[0025] In this embodiment, it should be noted that, in this embodiment, the indoor unit reheat condenser 15 is not only used to recover condensation heat, but also to adjust the flow and pressure of the refrigerant through the control of the third electronic expansion valve 17, so as to achieve more precise temperature control. The function of the solenoid valve 14 is to cut off the refrigerant passage of the indoor unit reheat condenser 15 when reheating is not required, so as to avoid unnecessary energy consumption. The parallel setting ensures that the refrigerant can flow smoothly in different working modes, thereby improving the flexibility and efficiency of the system.
[0026] Specifically, the first electronic expansion valve 7 is connected to the first filter 8 , and the first electronic expansion valve 7 and the first filter 8 are connected in parallel with the first check valve 6 .
[0027] In this embodiment, it should be noted that the first electronic expansion valve 7 is used to control the flow rate and pressure of the refrigerant flowing from the liquid storage tank 9 to the indoor unit, so as to achieve precise temperature control in the heating mode. The function of the first filter 8 is to filter out impurities and particulate matter in the refrigerant to prevent them from damaging or clogging other components in the system (such as the compressor 1, the condenser, etc.). The parallel setting ensures that the refrigerant can be precisely controlled and kept clean in the process of flowing to the indoor unit.
[0028] Specifically, the second electronic expansion valve 13 is connected to the second filter 12 , and the second electronic expansion valve 13 and the second filter 12 are connected in parallel with the second one-way valve 16 .
[0029] In this embodiment, it should be noted that the second electronic expansion valve 13 is also used to control the flow and pressure of the refrigerant, but here it mainly acts before the indoor unit evaporator 18 to ensure that the refrigerant has a suitable state when entering the evaporator. The function of the second filter 12 is to further filter the refrigerant to prevent any possible impurities or particles from entering the indoor unit evaporator 18, thereby protecting the performance and life of the evaporator. The parallel setting enhances the system's control and protection capabilities for the flow of refrigerant.
[0030] Specifically, a gas-liquid separator 2 is provided between the second joint 32 and the compressor 1 .
[0031] In this embodiment, it should be noted that the gas-liquid separator 2 is provided at the inlet of the compressor 1, which can effectively separate the liquid part of the refrigerant and ensure that only the gaseous refrigerant enters the compressor 1. This helps to prevent the compressor 1 from being damaged by the impact of the liquid refrigerant, and also helps to improve the efficiency and life of the compressor 1.
[0032] It should also be noted that the fan 5 adopts a variable frequency motor, which can achieve stepless regulation and can achieve precise control of the heat recovery amount of the indoor unit reheat condenser 15 to ensure the constant air supply temperature of the indoor unit.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.
Claims
1. A two-pipe heat recovery direct expansion air conditioning unit, characterized in that: It includes outdoor unit and indoor unit; among which, The outdoor unit comprises a compressor, an electromagnetic four-way reversing valve, an outdoor unit condenser, a fan, a first one-way valve, a liquid reservoir, and a first electronic expansion valve. The electromagnetic four-way reversing valve comprises a first joint, a second joint, a third joint, and a fourth joint. The first joint and the second joint are respectively connected to the inlet and outlet of the compressor, the third joint is connected to the outdoor unit condenser, the outdoor unit condenser is directly opposite to the fan, the outdoor unit condenser is connected to the first one-way valve, the first one-way valve is connected to the liquid reservoir, and the first electronic expansion valve and the first one-way valve are connected in parallel with each other. The indoor unit comprises a second electronic expansion valve, an indoor unit evaporator and a second one-way valve, the second electronic expansion valve is connected to the liquid reservoir via a first refrigerant connection pipe, the second electronic expansion valve is connected to the indoor unit evaporator, the indoor unit evaporator is connected to the fourth joint via a second refrigerant connection pipe, and the second one-way valve is connected in parallel with the second electronic expansion valve; The indoor unit also includes an indoor unit reheat condenser, a solenoid valve and a third electronic expansion valve. The solenoid valve and the indoor unit reheat condenser are connected to each other, and the solenoid valve and the indoor unit reheat condenser are connected in parallel with the second one-way valve.
2. The two-pipe heat recovery direct expansion air conditioning unit according to claim 1, characterized in that: The indoor unit reheat condenser is also connected to a third electronic expansion valve, and the solenoid valve, the indoor unit reheat condenser and the third electronic expansion valve are connected in parallel with the second one-way valve.
3. The two-pipe heat recovery direct expansion air conditioning unit according to claim 1, characterized in that: The first electronic expansion valve is connected to a first filter, and the first electronic expansion valve and the first filter are connected in parallel with the first one-way valve.
4. The two-pipe heat recovery direct expansion air conditioning unit according to claim 1, characterized in that: The second electronic expansion valve is connected to a second filter, and the second electronic expansion valve and the second filter are connected in parallel with the second one-way valve.
5. The two-pipe heat recovery direct expansion air conditioning unit according to claim 1, characterized in that: A gas-liquid separator is provided between the second joint and the compressor.