Throttling system giving consideration to cooling and heating requirements of air conditioner

Abstract

The invention discloses a throttling system giving consideration to the cooling and heating requirements of an air conditioner, and belongs to the technical field of air conditioner structures, the throttling system comprises an air conditioner with two heat exchangers of an evaporator and a condenser, and a throttling assembly arranged between the evaporator and the condenser of the air conditioner in series, and the throttling assembly comprises a throttling valve and a balance tank; according to the inner volumes of the evaporator and the condenser or the emphasis mode of the air conditioner, the balance tank is in bypass connection to a main pipeline between the throttling valve and the heat exchanger corresponding to the mode with the relatively large inner volume or the emphasis mode; when the difference value of the inner volume of the evaporator and the inner volume of the condenser is smaller than a preset value, the balance tank selects a proper bypass position according to the emphasis mode of the air conditioner, the position of the balance tank is optimized and correspondingly adjusted according to the actual situation, the throttling effect of the throttling valve is ensured, the flow of a refrigerant is effectively and dynamically balanced, and the service life of the air conditioner is prolonged. And the air conditioner is in an optimal state.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioner connection structures, and in particular to a throttling system that takes into account both cooling and heating requirements of the air conditioner. Background Art

[0002] In the field of air conditioners, the throttling device is one of the essential and important parts of compression air conditioner products. The refrigerant coming out of the condenser is in a high-temperature and high-pressure liquid state. After passing through the throttling device, it will become a low-temperature and low-pressure gas-liquid two-phase state, thereby absorbing heat from the evaporator. Commonly used throttling devices usually use capillary tubes, throttling valves or thermal expansion valves to throttle.

[0003] Since the condenser and evaporator of some models of air conditioners have different volumes, relying solely on the throttling effect of the throttling device will cause changes in working conditions or the flow of the larger heat exchanger to another heat exchanger, which will produce excess refrigerant, causing the air conditioner to fail to perform well. To address this problem, it is usually necessary to install a liquid reservoir at the front end of the throttling device to cope with the impact of different capacities and changes in working conditions of the two devices, so that the air conditioning product can perform well under all working conditions. However, in products with dual requirements for cooling and heating, since the flow paths of cooling and heating are opposite, it can only be guaranteed that the liquid reservoir in one mode is at the front end of the throttling device and in the other mode is at the rear end of the throttling device. When it is located at the rear end, the throttling effect will be worse, resulting in a decrease in the heat exchanger and performance coefficient of the machine. Most manufacturers can only choose one mode as the main mode and passively accept the fact that the performance of the other mode is poor. Some other manufacturers will adopt the solution of one-way valve bridge, that is, use 4 one-way valves as connections, and change the direction of the system through the characteristics of forward conduction and reverse interception of the one-way valve, so as to ensure that in cooling and heating modes, the flow direction of the refrigerant first passes through the liquid storage device and then passes through the throttling device. However, this solution also has disadvantages. First, the cost of adding 4 one-way valves is high. Second, one-way valves are components with a high failure rate and are prone to reverse cross-flow. After cross-flow, the front and back of the throttling will be connected, and the system will lose the throttling effect, so that the machine loses the cooling and heating functions. The one-way valve is a mechanical part, and cross-flow will not report any faults to remind the user that there is a problem with the machine. Even if the user checks the machine because the machine has no cooling and heating effects, it is not easy to find the problem, which increases the maintenance time.

[0004] How to optimize and improve the throttling effect and balance the flow of refrigerant is a technical problem that needs to be solved urgently to improve the operating performance of the air conditioner. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a throttling system that improves the refrigeration and heating performance of the product and takes into account the cooling and heating needs of the air conditioner.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a throttling system that takes into account the cooling and heating needs of an air conditioner, including an air conditioner having two heat exchangers, an evaporator and a condenser, and a throttling component arranged in series between the evaporator and the condenser of the air conditioner, wherein the throttling component includes a throttling valve and a balancing tank, wherein both ends of the throttling valve are respectively connected in series to the evaporator and the condenser through a preset main pipe; according to the internal volume size of the evaporator and the condenser or the focus mode of the air conditioner, the balancing tank is bypass-connected to the main pipe between the throttling valve and the heat exchanger with a relatively large internal volume or corresponding to the focus mode; when the difference in the internal volume between the evaporator and the condenser is less than a preset value, the balancing tank selects a suitable bypass position according to the focus mode of the air conditioner, wherein when the focus mode of the air conditioner is a cooling mode, the balancing tank is bypass-connected to the main pipe between the throttle valve and the condenser; conversely, when the focus mode of the air conditioner is a heating mode, the balancing tank is bypass-connected to the main pipe between the throttle valve and the evaporator.

[0007] Furthermore, filters are provided on the main pipes from both ends of the throttle valve to the evaporator and the condenser.

[0008] Furthermore, the balance tank is located at a height position above the throttle valve and the main pipes leading out from both ends thereof.

[0009] Furthermore, the diameter of the bypass branch pipe on the main pipe leading from the balancing tank to the end of the throttle valve is greater than or equal to 30% of the diameter of the main pipe.

[0010] Furthermore, the outer periphery of the main pipe is covered with thermal insulation cotton.

[0011] Furthermore, the outer periphery of the balancing tank is covered with thermal insulation cotton.

[0012] The present invention adopts the above-mentioned scheme, and its beneficial effect lies in: by making the balance tank bypass connected to the main line between the throttle valve and the heat exchanger with a relatively large internal volume or corresponding to the focus mode according to the internal volume size of the evaporator and the condenser or the air conditioner focus mode, the position of the balance tank is optimized and adjusted accordingly according to the actual situation, ensuring the throttling effect of the throttle valve, effectively and dynamically balancing the flow of the refrigerant, and ensuring that the air conditioner is in the best state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The diagram is a cooling mode diagram of a throttling component applied to an air conditioner whose emphasis mode is cooling mode.

[0014] Figure 2 The diagram is a schematic diagram of a heating mode in which a throttling component is applied to an air conditioner whose main mode is a cooling mode.

[0015] Figure 3The diagram is a heating mode diagram of a throttling component applied to an air conditioner whose emphasis mode is the heating mode.

[0016] Figure 4 The diagram is a schematic diagram of a cooling mode in which a throttling component is applied to an air conditioner whose emphasis mode is a heating mode.

[0017] Among them, 11 is a throttle valve, 12 is a balance tank, 131 is a first pipeline, 132 is a second pipeline, and 14 is a filter. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0019] See attached Figure 1-4 As shown, in this embodiment, a throttling system that takes into account both the cooling and heating needs of an air conditioner includes an air conditioner and a throttling assembly, wherein the air conditioner includes an evaporator, a condenser and related components (not shown in the figure, such as a compressor, a four-way valve and other conventional components, which will not be described in detail here). The evaporator and condenser here are two types of heat exchangers of the air conditioner, and the flow direction of the refrigerant between the two heat exchangers is determined according to the operating mode (cooling mode or heating mode) of the air conditioner.

[0020] In this embodiment, the throttling assembly is arranged in series between the evaporator and the condenser of the air conditioner, wherein the refrigerant flow direction when the air conditioner is in cooling mode is "condenser → throttling assembly → evaporator", conversely, the refrigerant flow direction when the air conditioner is in heating mode is "evaporator → throttling assembly → condenser".

[0021] In this embodiment, the throttling assembly includes a throttling valve 11 and a balancing tank 12, wherein both ends of the throttling valve 11 are connected in series to the evaporator and the condenser through a preset main pipeline, respectively. For the convenience of explanation, the main pipeline between the throttling valve 11 and the condenser is defined as the first pipeline 131, and the main pipeline between the throttling valve 11 and the evaporator is defined as the second pipeline 132. Secondly, according to the internal volume size of the evaporator and the condenser or the focus mode of the air conditioner, the balancing tank 12 is bypassed and connected to the main pipeline between the throttling valve 11 and the heat exchanger with a relatively large internal volume or a focus mode.

[0022] Specifically, the installation position of the balancing tank 12 gives priority to the internal volume of the heat exchanger. The balancing tank 12 is installed on the main pipe on the side of the heat exchanger with a relatively large internal volume, so as to store the excess refrigerant flowing out of this side in time, thereby adjusting the refrigeration system of the air conditioner in time.

[0023] Specifically, considering that the actual internal volumes of the evaporator and the condenser are relatively close, when the difference between the internal volumes of the evaporator and the condenser is less than a preset value (preferably, the preset value refers to 20% of the maximum internal volume in the evaporator or the condenser), the balancing tank 12 selects a suitable bypass position according to the air conditioner focus mode, wherein, when the air conditioner focus mode is the cooling mode, the balancing tank 12 is bypass-connected to the main pipe between the throttle valve 11 and the condenser (that is, the balancing tank 12 is bypass-connected to the first pipe 131); conversely, when the air conditioner focus mode is the heating mode, the balancing tank 12 is bypass-connected to the main pipe between the throttle valve 11 and the evaporator (that is, the balancing tank 12 is bypass-connected to the second pipe 132).

[0024] For ease of understanding, further explanation is provided below in conjunction with the specific bypass connection position and the operating mode of the air conditioner.

[0025] Specifically, the throttling component is applied to an air conditioner whose focus mode is cooling mode: 1) Air conditioner operation cooling mode: see attached Figure 1 As shown, after the high-temperature and high-pressure gaseous refrigerant passes through the condenser for heat exchange, the medium-temperature and high-pressure liquid refrigerant is formed, which flows from the condenser to the throttle valve 11 of the throttling assembly. Due to the influence of the working conditions in the refrigeration mode, the required refrigerant flow rate is different, and the excess liquid refrigerant will be stored in the balance tank 12 (the gaseous refrigerant mixed in the liquid refrigerant will also flow upward into the balance ring), and the remaining liquid refrigerant flows to the throttle valve 11 for throttling (the liquid refrigerant here will form a low-pressure and low-temperature gas-liquid two-phase refrigerant after passing through the throttle valve 11). Then, the throttled gas-liquid two-phase refrigerant flows from the throttle valve 11 to the evaporator for heat exchange, and finally the refrigerant after heat exchange circulates normally in the air conditioner and flows back to the condenser, repeating the above flow cycle. The above-mentioned method ensures that the refrigerant flowing in the air-conditioning system will not be too much due to changes in operating conditions, causing high system pressure and poor refrigeration effect, and ensures that the refrigerant flowing through the throttle valve 11 is all liquid, without gaseous refrigerant, avoiding the problem of air blockage in the throttle valve 11, and ensuring that the air conditioner is always operating in the best state when in the cooling mode.

[0026] 2) Air conditioner operation heating mode: see attached Figure 2As shown, after the high-temperature and high-pressure gaseous refrigerant passes through the evaporator for heat exchange, it forms a medium-temperature and high-pressure liquid refrigerant, which flows from the evaporator to the throttle valve 11 of the throttling assembly (the liquid refrigerant here will form a low-pressure and low-temperature gas-liquid two-phase refrigerant after passing through the throttle valve 11). Subsequently, the throttled gas-liquid two-phase refrigerant flows from the throttle valve 11 to the condenser. At the same time, the gas-liquid two-phase refrigerant will be divided during the flow along the first pipeline 131. The gaseous refrigerant will flow upward into the balance tank 12, and the liquid refrigerant will continue to flow into the condenser through the first pipeline 131 for heat exchange. Finally, the refrigerant after heat exchange will circulate normally in the air conditioner and flow back to the evaporator, repeating the above flow cycle. The above method ensures that when the refrigerant flows to the condenser, there will be no large pressure drop, which will cause the heat exchange effect to deteriorate; secondly, the balance tank 12 can store excess refrigerant when the working conditions of the heating mode change, so that the heating effect is better.

[0027] Specifically, the throttling component is applied to an air conditioner whose focus mode is a heating mode: 1) Air conditioner operation heating mode: see attached Figure 3 As shown, after the high-temperature and high-pressure gaseous refrigerant passes through the evaporator for heat exchange, the medium-temperature and high-pressure liquid refrigerant is formed, which flows from the evaporator to the throttle valve 11 of the throttling assembly. Due to the influence of the working conditions in the refrigeration mode, the required refrigerant flow rate is different, and the excess liquid refrigerant will be stored in the balance tank 12 (the gaseous refrigerant mixed in the liquid refrigerant will also flow upward into the balance ring), and the remaining liquid refrigerant flows to the throttle valve 11 for throttling (the liquid refrigerant here will form a low-pressure and low-temperature gas-liquid two-phase refrigerant after passing through the throttle valve 11). The throttled gas-liquid two-phase refrigerant flows from the throttle valve 11 to the condenser for heat exchange, and finally the refrigerant after heat exchange circulates normally in the air conditioner and flows back to the evaporator, repeating the above flow cycle. The above-mentioned method ensures that the refrigerant flowing in the air-conditioning system will not be too much due to changes in operating conditions, causing high system pressure and poor heating effect, and ensures that the refrigerant in front of the throttle valve 11 is all liquid, without gaseous refrigerant, which will not cause air blockage in the throttle valve 11, thereby ensuring that the air conditioner always operates in the best state when in heating mode.

[0028] 2) Air conditioner operation cooling mode: see attached Figure 4As shown, after the high-temperature and high-pressure gaseous refrigerant is heat-exchanged in the condenser, the medium-temperature and high-pressure liquid refrigerant is formed, which flows from the condenser to the throttle valve 11 of the throttling assembly, and after throttling by the throttle valve 11, the low-pressure and low-temperature gas-liquid two-phase refrigerant is formed to flow to the evaporator. At the same time, the gas-liquid two-phase refrigerant will be divided during the flow along the second pipeline 132. The gaseous refrigerant will flow upward into the balance tank 12, and the liquid refrigerant will continue to flow into the evaporator through the second pipeline 132 for heat exchange. Finally, the refrigerant after heat exchange will circulate normally in the air conditioner and flow back to the condenser, repeating the above-mentioned flow cycle. The above-mentioned method can ensure that when the refrigerant flows to the evaporator, there will be no large pressure drop, which will cause the refrigeration effect to deteriorate. Secondly, the liquid storage tank (balance tank 12) can store excess refrigerant when the working conditions change, and the refrigeration effect is better.

[0029] Furthermore, regardless of whether the above-mentioned air conditioner focuses on the heating mode or the cooling mode, when the air conditioner is affected by changes in operating conditions, resulting in an increased demand for refrigerant, there is a shortage of refrigerant in the main line and the line pressure drops, so that the refrigerant in the balance tank 12 can flow back to the main line for timely replenishment, thereby achieving the effect of dynamic balance regulation.

[0030] In the above-mentioned air conditioner with the emphasis on heating mode or cooling mode, the outer periphery of the main pipe is covered with thermal insulation cotton, so as to reduce the heat loss caused by heat exchange between the refrigerant and the outside air during the flow along the main pipe.

[0031] In the above-mentioned air conditioner with the emphasis on heating mode or cooling mode, the outer periphery of the balancing tank 12 is covered with thermal insulation cotton to prevent the refrigerant flowing into the balancing tank 12 from exchanging heat with the outside air, causing the refrigerant temperature in the tank to be higher than the refrigerant temperature in the main line, thereby affecting the refrigerant in the main line from entering the balancing tank 12, thereby eliminating the function of storing the refrigerant.

[0032] In this embodiment, the diameter of the bypass branch pipe on the main pipe leading from the balancing tank 12 to the end of the throttle valve 11 is greater than or equal to 30% of the diameter of the main pipe. If the diameter is too small, the refrigerant flow rate in and out of the balancing tank 12 will be too slow, which is not conducive to the storage of gaseous refrigerant and the adjustment of refrigerant when the working conditions change. Preferably, the diameter of the bypass branch pipe of the balancing tank 12 is as large as possible, but considering factors such as actual cost, those skilled in the art can adjust the diameter size adaptively.

[0033] In this embodiment, the balance tank 12 is located at a height position above the throttle valve 11 and the main pipe leading out from both ends thereof, so that the gaseous or gas-liquid two-phase refrigerant in the main pipe can preferentially enter the balance tank 12 by virtue of the height difference, thereby ensuring that liquid refrigerant remains in the main pipe as much as possible.

[0034] In this embodiment, the throttle valve 11 can be an electronic expansion valve, a thermal expansion valve, a capillary tube, a throttle core, or a combination of several throttle modes. The throttle valve 11 should be able to flow in both directions and meet the needs of cooling and heating at the same time.

[0035] In this embodiment, filters 14 are provided on the main pipes from both ends of the throttle valve 11 to the evaporator and the condenser, that is, the two filters 14 can effectively prevent the refrigerant from filtering out impurities while flowing along the first pipe 131 or the second pipe 132, and prevent impurities from entering the throttle valve 11, so as to avoid clogging the throttle valve 11 and affecting the throttling effect.

[0036] In this embodiment, the length of the main pipeline connected to the end of the throttle valve 11 that is not bypassed by the balance tank 12 is the minimum rated length, that is, in the air conditioner with the focus mode being the cooling mode, the length of the main pipeline from the throttle valve 11 to the evaporator (that is, the first pipeline 131) is the minimum rated length; conversely, in the air conditioner with the focus mode being the heating mode, the length of the main pipeline from the throttle valve 11 to the condenser (that is, the second pipeline 132) is the minimum rated length. The minimum rated length here is determined by the actual air conditioner specifications, that is, under the condition of meeting the circulation requirements of the refrigerant, the length value of the main pipeline from the throttle valve 11 to the evaporator is shortened as much as possible. The length values ​​corresponding to different air conditioner specifications are different, and are not specifically limited here. Those skilled in the art can select the length adaptively according to the actual specifications. The above method is adopted mainly to ensure that the throttled refrigerant can quickly enter the evaporator / condenser for heat exchange and reduce pipeline resistance loss.

[0037] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, makes more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modifications are all equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A throttling system that takes into account both cooling and heating requirements of an air conditioner, comprising an air conditioner having two heat exchangers, an evaporator and a condenser, and a throttling component arranged in series between the evaporator and the condenser of the air conditioner, characterized in that: The throttling assembly comprises a throttling valve (11) and a balancing tank (12), wherein two ends of the throttling valve (11) are respectively connected in series to an evaporator and a condenser via a preset main pipeline; According to the internal volume of the evaporator and the condenser or the emphasis mode of the air conditioner, the balance tank (12) is connected in bypass to the main pipe between the throttle valve (11) and the heat exchanger with a relatively large internal volume or corresponding to the emphasis mode; When the difference in the internal volume between the evaporator and the condenser is less than a preset value, the balancing tank (12) selects a suitable bypass position according to the air conditioner focus mode, wherein when the air conditioner focus mode is the cooling mode, the balancing tank (12) is bypass-connected to the main pipe between the throttle valve (11) and the condenser; conversely, when the air conditioner focus mode is the heating mode, the balancing tank (12) is bypass-connected to the main pipe between the throttle valve (11) and the evaporator.

2. A throttling system that takes into account both cooling and heating requirements of an air conditioner according to claim 1, characterized in that: Filters (14) are provided on the main pipes from both ends of the throttle valve (11) to the evaporator and the condenser.

3. A throttling system for taking into account both cooling and heating requirements of an air conditioner according to claim 1, characterized in that: The balance tank (12) is located at a height position above the throttle valve (11) and the main pipes leading out from both ends thereof.

4. A throttling system for taking into account both cooling and heating requirements of an air conditioner according to claim 1, characterized in that: The diameter of the bypass branch pipe on the main pipe leading from the balance tank (12) to the end of the throttle valve (11) is greater than or equal to 30% of the diameter of the main pipe.

5. The throttling system for taking into account both cooling and heating requirements of an air conditioner according to claim 1, characterized in that: The outer periphery of the main pipe is covered with thermal insulation cotton.

6. A throttling system for taking into account both cooling and heating requirements of an air conditioner according to claim 1, characterized in that: The outer periphery of the balance tank (12) is covered with thermal insulation cotton.

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