Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system, and aims to solve the problem of how to reduce the cost and space occupancy rate of the air conditioning system while avoiding large fluctuation of exhaust temperature caused by too small opening of an expansion valve in the heating process. In order to achieve the purpose, according to the air conditioning system, the one-way throttle valve is arranged between the evaporator and the expansion valve to replace a capillary tube and a control valve which are traditionally arranged in parallel, the product cost and the space occupancy rate are effectively reduced, it is guaranteed that refrigerants smoothly pass through the one-way throttle valve in the refrigeration mode, efficient non-throttling conduction is achieved, and the service life of the air conditioning system is prolonged. Therefore, the refrigeration effect of the air-conditioning system is ensured; in the heating mode, the one-way throttle valve can assist in adjusting the opening degree of the expansion valve, so that the one-way throttle valve and the expansion valve cooperate to throttle a refrigerant, the situation that the opening degree of the expansion valve is too small, and consequently the exhaust temperature and the air outlet temperature fluctuate greatly is avoided, the heating effect of the air conditioner system is ensured, and the stability and reliability of the air conditioner system are improved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, and specifically provides an air conditioning system. Background Technology

[0002] During the operation of an air conditioning system, the refrigerant flow requirements within the evaporator differ significantly between cooling and heating modes. Specifically, in cooling mode, the larger temperature difference between the evaporator and the ambient temperature necessitates a corresponding increase in refrigerant flow. Conversely, in heating mode, the smaller temperature difference reduces the refrigerant flow requirement, especially when frost forms on the evaporator surface, causing its heat exchange performance to gradually decline. This further reduces the refrigerant flow demand, requiring the expansion valve opening to be adjusted accordingly to match the refrigerant flow. Furthermore, with advancements in ultra-low temperature heating technology, particularly in extreme temperatures below -20°C, the evaporator's refrigerant flow requirement is further reduced. This exacerbates the difference in flow requirements between cooling and heating modes, resulting in a significantly different range of expansion valve opening requirements between cooling and heating modes. Consequently, a single expansion valve often struggles to meet the needs of both modes simultaneously. Especially in heating mode, when the expansion valve is too open, the actual flow rate changes more than the demand changes. This makes it difficult to control the stability of the expansion valve opening, causing the refrigerant flow rate to fluctuate, resulting in large fluctuations in exhaust temperature and outlet air temperature, thus affecting indoor thermal comfort.

[0003] To address the aforementioned technical issues, a control valve and capillary tube are typically connected in parallel between the expansion valve and the evaporator. When the air conditioning system is in cooling mode, the control valve remains open, and the refrigerant flows through the expansion valve and primarily to the evaporator via the control valve. Conversely, when the system is in heating mode, the control valve closes, and the refrigerant flows through the capillary tube and then out through the expansion valve. This resolves the issue of significant fluctuations in exhaust and outlet air temperatures caused by the difference in flow requirements between cooling and heating modes in heating mode, where an excessively small expansion valve opening results in these fluctuations. However, this increases the cost and space requirements of the air conditioning system, hindering its widespread adoption.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] To address at least one problem in the prior art, namely, how to reduce the cost and space occupancy of the air conditioning system while avoiding large fluctuations in exhaust and outlet air temperatures due to excessively small expansion valve opening during heating, this application provides an air conditioning system comprising:

[0006] The evaporator, expansion valve, and condenser are connected in sequence.

[0007] A one-way throttling valve is disposed between the evaporator and the expansion valve, and is configured to open and throttle in heating mode, and open but not throttle in cooling mode.

[0008] In the preferred embodiment of the above-mentioned air conditioning system, the one-way throttle valve includes:

[0009] The valve body has a receiving space formed inside it, and the receiving space is connected to the evaporator and the condenser respectively;

[0010] A valve core is movably disposed within the accommodating space. The valve core has a valve core orifice and is configured such that, in the heating mode, only the refrigerant in the accommodating space is allowed to flow to the condenser through the valve core orifice. In the cooling mode, the refrigerant in both the accommodating space and the valve core orifice flows to the evaporator.

[0011] In the preferred embodiment of the above air conditioning system, the valve body is provided with a first connection hole and a second connection hole communicating with the accommodating space. The first connection hole is connected to the condenser, and the second connection hole is connected to the evaporator.

[0012] The valve core is configured to move between the first connection hole and the second connection hole, such that in the heating mode, the first connection hole communicates only with the valve core hole, and in the cooling mode, the second connection hole communicates with both the valve core hole and the accommodating space.

[0013] In the preferred embodiment of the above-mentioned air conditioning system, a first limiting structure is provided on the inner wall of the accommodating space, and a second limiting structure is provided on the valve core.

[0014] The first connecting hole penetrates the first limiting structure, and the valve core hole penetrates the second limiting structure. In the heating mode, the second limiting structure abuts against the first limiting structure and cooperates with the first limiting structure.

[0015] In the preferred embodiment of the above-mentioned air conditioning system, the first limiting structure is a limiting groove, and the second limiting structure is a limiting protrusion that matches the limiting groove; or

[0016] The first limiting structure is a limiting protrusion, and the second limiting structure is a limiting groove that matches the limiting protrusion.

[0017] In the preferred embodiment of the above air conditioning system, in the cooling mode, a gap is provided at the contact point between the valve core and the accommodating space, and the gap is connected to the accommodating space, the valve core hole, and the second connecting hole respectively.

[0018] In the preferred embodiment of the above air conditioning system, the valve body includes a first valve body and a second valve body connected to the first valve body; the first valve body and the second valve body are connected to form the accommodating space; the first valve body has a first connecting hole, and the second valve body has a second connecting hole.

[0019] In the preferred embodiment of the above-mentioned air conditioning system, the first valve body and the second valve body are detachably connected.

[0020] In the preferred embodiment of the above-mentioned air conditioning system, a first connecting structure is provided at the end of the first valve body near the second valve body, and a second connecting structure is provided at the end of the second valve body near the first valve body, wherein the first connecting structure is connected to the second connecting structure.

[0021] In the preferred embodiment of the above-mentioned air conditioning system, the first connecting structure is an internal thread provided on the inner wall of the first valve body, and the second connecting structure is an external thread provided on the outer wall of the second valve body; or

[0022] The first connection structure is an external thread provided on the outer wall of the first valve body, and the second connection structure is an external thread provided on the inner wall of the second valve body; or

[0023] The first connecting structure is a first connecting plate disposed on the outer wall of the first valve body, and the second connecting mechanism is a first connecting plate disposed on the outer wall of the second valve body. The first connecting plate and the second connecting plate are connected by fasteners.

[0024] Those skilled in the art will understand that this application provides an air conditioning system that replaces the traditional parallel capillary tube and control valve by setting a one-way throttle valve between the evaporator and the expansion valve. This not only effectively reduces product costs and space occupancy, but also ensures that the refrigerant flows smoothly through the one-way throttle valve in cooling mode, achieving efficient conduction without throttling, thereby ensuring the cooling effect of the air conditioning system. In heating mode, the one-way throttle valve can assist in adjusting the opening of the expansion valve, so that it works with the expansion valve to throttle the refrigerant, avoiding large fluctuations in exhaust temperature and outlet air temperature caused by the expansion valve opening being too small, ensuring the heating effect of the air conditioning system, and improving the stability and reliability of the air conditioning system.

[0025] Furthermore, the valve core is movably disposed in the accommodating space, so that in the heating mode, only the refrigerant in the accommodating space is allowed to flow to the condenser through the valve core hole, avoiding large fluctuations in exhaust temperature and outlet air temperature due to the expansion valve opening being too small during the heating process. In the cooling mode, the refrigerant in both the accommodating space and the valve core hole flows to the evaporator, ensuring the cooling effect of the air conditioning system, thereby improving the stability and reliability of the air conditioning system.

[0026] Furthermore, by setting a first limiting structure on the inner wall of the accommodating space and a second limiting structure on the valve core, the second limiting structure abuts against and cooperates with the first limiting structure in the heating mode, ensuring that the one-way throttling valve throttles the refrigerant while it is conducting. This not only ensures the heating effect of the air conditioning system, but also avoids the problem of large fluctuations in exhaust temperature and outlet air temperature due to the expansion valve opening being too small, thus affecting the heating effect of the air conditioning system.

[0027] Furthermore, by setting a gap at the contact point between the valve core and the accommodating space in the cooling mode, and having the gap connected to the accommodating space, the valve core hole, and the second connecting hole respectively, the one-way valve can achieve full conduction of refrigerant without throttling, thereby ensuring the cooling effect of the air conditioning system.

[0028] Furthermore, by detachably connecting the first valve body and the second valve body, it is easy to replace the valve core, which helps the one-way throttle valve meet the throttling requirements of the air conditioning system under different operating conditions. Attached Figure Description

[0029] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0030] Figure 1 This is a flowchart of the air conditioning system of this application;

[0031] Figure 2 This is an exploded view of the one-way throttle valve of this application;

[0032] Figure 3 This is a cross-sectional view of the one-way throttle valve in this application in cooling mode;

[0033] Figure 4 This is a cross-sectional view of the one-way throttle valve in the heating mode of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Compressor; 2. Four-way valve; 3. Condenser; 4. Expansion valve; 5. Evaporator; 6. One-way throttle valve; 61. Valve body; 611. First valve body; 6111. First receiving groove; 61111. Limiting groove; 6112. First connecting hole; 612. Second valve body; 6121. Second receiving groove; 6122. Second connecting hole; 62. Valve core; 621. Valve core hole; 622. Limiting protrusion; 63. Gap. Detailed Implementation

[0036] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0037] It should be noted that in the description of this application, the terms "upper", "lower", "inner", "bottom", "end", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0038] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] First refer to Figure 1-4 The air conditioning system described in this application is described below.

[0040] To address the issue of reducing the cost and space occupancy of air conditioning systems while avoiding significant fluctuations in exhaust and outlet air temperatures due to excessively small expansion valve opening during heating, the air conditioning system of this application includes an evaporator 5, an expansion valve 4, and a condenser 3 connected in sequence. A one-way throttling valve 6 is provided between the evaporator 5 and the expansion valve 4, configured to be open and throttled in heating mode, and open but not throttled in cooling mode.

[0041] This application replaces the traditional parallel capillary tube and control valve by setting a one-way throttling valve 6 between the evaporator 5 and the expansion valve 4. This not only effectively reduces product cost and space occupancy, but also ensures that the refrigerant flows smoothly through the one-way throttling valve 6 in cooling mode, achieving efficient conduction without throttling, thereby ensuring the cooling effect of the air conditioning system. In heating mode, the one-way throttling valve 6 can assist in adjusting the opening of the expansion valve 4, so that it works with the expansion valve 4 to throttle the refrigerant, thereby avoiding large fluctuations in exhaust temperature and outlet air temperature caused by the expansion valve opening being too small, ensuring the heating effect of the air conditioning system, and improving the stability and reliability of the air conditioning system.

[0042] The following is further reference Figure 1-4 A preferred embodiment of the air conditioning system of this application is described below. Those skilled in the art will understand that the embodiments described below are merely illustrative of the principles of this application and are not intended to limit the scope of protection of this application. Provided that the air conditioning system includes at least an evaporator 5, an expansion valve 4, a condenser 3, and a one-way throttle valve 6, those skilled in the art can adjust the following configuration to make this application applicable to more specific application scenarios.

[0043] like Figure 1 As shown, in a preferred embodiment, the air conditioning system includes a compressor 1, a four-way valve 2, a condenser 3, an expansion valve 4, a one-way throttle valve 6, and an evaporator 5. The one-way throttle valve 6 is positioned between the expansion valve 4 and the evaporator 5. When the air conditioning system is in heating mode, the refrigerant first flows through the one-way throttle valve 6 and then through the expansion valve 4. This allows the one-way throttle valve 6 and the expansion valve 4 to sequentially throttle the refrigerant, thereby improving the heating efficiency and stability of the air conditioning system. This avoids the problem of large fluctuations in exhaust and outlet temperatures caused by the expansion valve 4 having an excessively small opening, which would negatively impact the heating performance of the air conditioning system.

[0044] Reference Figure 2-4 The one-way throttle valve 6 includes a valve body 61 and a valve core 62. The valve body 61 includes a first valve body 611 and a second valve body 612. The first valve body 611 has a first receiving groove 6111 at its end near the second valve body 612, and the second valve body 612 has a second receiving groove 6121 at its end near the first valve body 611. The first valve body 611 has a first connecting structure, which is an external thread on the outer wall of the first valve body 611. The second valve body 612 has a second connecting structure, which is an internal thread on the inner wall of the second receiving groove 6121. This allows the first valve body 611 and the second valve body 612 to be detachably connected via threaded engagement, and the communication between the first receiving groove 6111 and the second receiving groove 6121 forms an accommodating space.

[0045] Of course, the detachable connection method of the first valve body 611 and the second valve body 612 is not fixed in this application, and those skilled in the art can adjust it as needed. For example, the first connection structure is an internal thread provided on the inner wall of the first receiving groove 6111, and the second connection structure is an external thread provided on the outer wall of the first valve body 611; or the first connection structure is a first connecting plate provided on the outer wall of the first valve body 611, and the second connection mechanism is a first connecting plate provided on the outer wall of the second valve body 612, wherein the first connecting plate and the second connecting plate are connected by fasteners, wherein the fasteners can be bolts and nuts.

[0046] See next Figure 1 The first valve body 611 has a first connecting hole 6112 at its end away from the second valve body 612, which is connected to the condenser 3. The second valve body 612 has a second connecting hole 6122 at its end away from the first valve body 611, which is connected to the expansion valve 4. The first connecting hole 6112 extends through the wall of the first receiving groove 6111, thus communicating with the first receiving groove 6111. The second connecting hole 6122 extends through the wall of the second receiving groove 6121, thus communicating with the second receiving groove 6121, thereby ensuring that both the first connecting hole 6112 and the second connecting hole 6122 are connected to the accommodating space. With the above configuration, when the air conditioning system is in heating mode, the refrigerant enters the containment space through the second connection hole 6122, then enters the expansion valve 4 through the first connection hole 6112, and finally flows into the condenser 3; while when the air conditioning system is in cooling mode, the refrigerant enters the containment space through the first connection hole 6112 after passing through the expansion valve 4, and then enters the condenser 3 through the second connection hole 6122.

[0047] Of course, the positions of the first connecting hole 6112 and the second connecting hole 6122 are not fixed in this application, and those skilled in the art can adjust them according to specific application scenarios. For example, the first connecting hole 6112 can be formed on the side wall of the first valve body 611. And / or, the second connecting hole 6122 can be formed on the side wall of the second valve body 612.

[0048] Furthermore, this application does not limit the overall shape of the first connecting hole 6112 and the second connecting hole 6122, as long as the first connecting hole 6112 can be connected to the accommodating space and the condenser 3 respectively, and the second connecting hole 6122 can be connected to the accommodating space and the evaporator 5 respectively. For example, the first connecting hole 6112 and the second connecting hole 6122 can be as follows: Figure 2-4 The diagram shown can be linear, or it can be curved, etc.

[0049] See next Figure 2-4The accommodating space contains a valve core 62, which can move between the first connecting hole 6112 and the second connecting hole 6122 under the action of the refrigerant. Specifically, when refrigerant enters the accommodating space through the first connecting hole 6112, the valve core 62 moves towards the second connecting hole 6122 under the action of the refrigerant and contacts the wall of the second receiving groove 6121. When refrigerant enters the accommodating space through the second connecting hole 6122, the valve core 62 moves towards the first connecting hole 6112 under the push of the refrigerant and contacts the wall of the first receiving groove 6111. The valve core 62 has a valve core hole 621. When the valve core 62 moves towards the first connecting hole 6112 under the action of the refrigerant and abuts against the top of the first receiving groove 6111, the valve core hole 621 communicates with the first connecting hole 6112, allowing the refrigerant in the valve core hole 621 to flow to the condenser 3 through the first connecting hole 6112. When the valve core 62 moves toward the second connecting hole 6122 and abuts against the bottom of the second receiving groove 6121, the valve core hole 621 communicates with the second connecting hole 6122, so that the refrigerant in the valve core hole 621 can flow to the evaporator 5 through the second connecting hole 6122.

[0050] It should be noted that when the air conditioning system is in heating mode, the refrigerant first flows through the one-way throttle valve 6 and then through the expansion valve 4. This allows the valve core 62 to slide more easily due to the pressure difference and flow dynamics of the refrigerant, making it less prone to jamming. Furthermore, since the first valve body 611 and the second valve body 612 are detachably connected, it is convenient to replace valve cores 62 with different orifice diameters 621, thus enabling the one-way throttle valve 6 to meet the throttling requirements of the air conditioning system under different operating conditions.

[0051] See next Figure 2-4 A first limiting structure is provided on the wall of the first receiving groove 6111. The first limiting structure is a limiting groove 61111 formed at the top of the first receiving groove 6111, and a first connecting hole 6112 passes through the limiting groove 61111. A second limiting structure is provided on the valve core 62. The second limiting structure is a limiting protrusion 622 formed at one end of the valve core 62 near the top of the first receiving groove 6111, and a valve core hole 621 passes through the limiting protrusion 622. The limiting groove 61111 and the limiting protrusion 622 engage in a concave-convex fit, so that when the refrigerant enters the accommodating space through the second connecting hole 6122, the valve core 62 moves towards the first connecting hole 6112 under the push of the refrigerant. The limiting protrusion 622 on the valve core 62 engages with the limiting groove 61111 on the first accommodating groove 6111, so that the refrigerant in the accommodating space can only flow to the first connecting hole 6112 through the valve core hole 621. This allows the one-way throttle valve 6 to throttle the refrigerant when the control system is in heating mode.

[0052] Of course, the specific configuration of the first and second limiting structures in this application is not fixed, and those skilled in the art can adjust them as needed. For example, the first limiting structure can also be a limiting protrusion 622 provided on the top of the first receiving groove 6111, and the second limiting structure can be a limiting groove 61111 provided on the valve core 62 near the top of the first receiving groove 6111.

[0053] See next Figure 1 The bottom of the second receiving groove 6121 is recessed downwards away from the first valve body 611, and the end of the valve core 62 near the bottom of the second receiving groove 6121 is recessed towards the first valve body 611. This allows the bottom of the valve core 62 to contact the bottom of the second receiving groove 6121 when the refrigerant enters the accommodating space through the first connecting hole 6112, forming a gap 63. This gap 63 communicates with the accommodating space, the valve core hole 621, and the second connecting hole 6122, thus achieving a dual flow path and ensuring cooling effect. The first path is: the refrigerant in the valve core hole 621 flows to the evaporator 5 through the second connecting hole 6122. The second path is: the refrigerant in the accommodating space enters the second connecting hole 6122 through the gap 63 and flows to the evaporator 5.

[0054] Of course, the method of forming the gap 63 is not fixed in this application, and those skilled in the art can adjust it as needed. For example, a limiting rod is provided at the bottom of the second receiving groove 6121, so that when the valve core 62 moves away from the first valve body 611, the valve core 62 abuts against the limiting rod, so that a gap 63 is formed between the end of the valve core 62 away from the first valve body 611 and the bottom of the second receiving groove 6121, which communicates with the receiving space, the valve core hole 621, and the second connecting hole 6122.

[0055] Combination Figure 1-4 Describe the working process of the air conditioning system in this application:

[0056] When the air conditioning system is in cooling mode, the low-pressure gaseous refrigerant is converted into a high-pressure gaseous refrigerant by compressor 1. It then flows into condenser 3 via four-way valve 2, where it changes from a gaseous state to a high-pressure liquid state. After passing through expansion valve 4, the high-pressure liquid refrigerant is converted into a low-pressure gas-liquid two-phase refrigerant. It then passes through one-way throttling valve 6, which has no throttling effect in this direction, and flows into evaporator 5. Here, the refrigerant changes from a low-pressure gas-liquid two-phase refrigerant to a low-pressure gaseous state, and then flows back into compressor 1 via four-way valve 2.

[0057] When the air conditioning system is in heating mode, the low-pressure gaseous refrigerant is converted into a high-pressure gaseous refrigerant by the compressor 1. The four-way valve 2 reverses the flow into the evaporator 5, where the refrigerant changes from a high-pressure gaseous state to a high-pressure liquid state. It then passes through the one-way throttle valve 6 and the expansion valve 4 in sequence. At this time, the one-way throttle valve 6 has a throttling and pressure-reducing effect. The refrigerant is affected by the double throttling effect of the one-way throttle valve 6 and the expansion valve 4, changing from a high-pressure liquid refrigerant to a low-pressure gas-liquid two-phase refrigerant. It then flows into the condenser 3, where the refrigerant changes from a low-pressure gas-liquid two-phase refrigerant to a low-pressure gaseous refrigerant. Finally, it flows through the four-way valve 2 back to the compressor 1.

[0058] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes: The evaporator, expansion valve, and condenser are connected in sequence. A one-way throttling valve is disposed between the evaporator and the expansion valve, and is configured to open and throttle in heating mode, and open but not throttle in cooling mode.

2. The air conditioning system according to claim 1, characterized in that, The one-way throttle valve includes: The valve body has a receiving space formed inside it, and the receiving space is connected to the evaporator and the condenser respectively; A valve core is movably disposed within the accommodating space. The valve core has a valve core orifice and is configured such that, in the heating mode, only the refrigerant in the accommodating space is allowed to flow to the condenser through the valve core orifice. In the cooling mode, the refrigerant in both the accommodating space and the valve core orifice flows to the evaporator.

3. The air conditioning system according to claim 2, characterized in that, The valve body is provided with a first connection hole and a second connection hole that communicate with the accommodating space. The first connection hole is connected to the condenser, and the second connection hole is connected to the evaporator. The valve core is configured to move between the first connection hole and the second connection hole, such that in the heating mode, the first connection hole communicates only with the valve core hole, and in the cooling mode, the second connection hole communicates with both the valve core hole and the accommodating space.

4. The air conditioning system according to claim 3, characterized in that, A first limiting structure is provided on the inner wall of the accommodating space, and a second limiting structure is provided on the valve core; The first connecting hole penetrates the first limiting structure, and the valve core hole penetrates the second limiting structure. In the heating mode, the second limiting structure abuts against the first limiting structure and cooperates with the first limiting structure.

5. The air conditioning system according to claim 4, characterized in that, The first limiting structure is a limiting groove, and the second limiting structure is a limiting protrusion that matches the limiting groove; or The first limiting structure is a limiting protrusion, and the second limiting structure is a limiting groove that matches the limiting protrusion.

6. The air conditioning system according to claim 3, characterized in that, In the cooling mode, a gap is provided at the contact point between the valve core and the accommodating space, and the gap is connected to the accommodating space, the valve core hole, and the second connecting hole.

7. The air conditioning system according to claim 3, characterized in that, The valve body includes a first valve body and a second valve body connected to the first valve body; the first valve body and the second valve body are connected to form the accommodating space; the first valve body has a first connecting hole, and the second valve body has a second connecting hole.

8. The air conditioning system according to claim 7, characterized in that, The first valve body and the second valve body are detachably connected.

9. The air conditioning system according to claim 8, characterized in that, The first valve body has a first connecting structure at one end near the second valve body, and the second valve body has a second connecting structure at one end near the first valve body. The first connecting structure is connected to the second connecting structure.

10. The air conditioning system according to claim 9, characterized in that, The first connecting structure is an internal thread provided on the inner wall of the first valve body, and the second connecting structure is an external thread provided on the outer wall of the second valve body; or The first connection structure is an external thread provided on the outer wall of the first valve body, and the second connection structure is an external thread provided on the inner wall of the second valve body; or The first connecting structure is a first connecting plate disposed on the outer wall of the first valve body, and the second connecting structure is a second connecting plate disposed on the outer wall of the second valve body. The first connecting plate and the second connecting plate are connected by fasteners.

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