Expansion valve

Abstract

The expansion valve comprises a valve body assembly, a pressure reduction module and a noise reduction assembly, the valve body assembly is provided with a valve port, a first side and a second side, the valve port is located between the first side and the second side, and the valve port communicates with the first side and the second side; the pressure reduction module and the silencing assembly are both arranged on the second side, and the pressure reduction module is located between the valve port and the silencing assembly and provided with a flow channel communicating with the valve port and the silencing assembly. The expansion valve has a first working condition, and when the expansion valve is in the first working condition, a working medium flows to the valve port from the first side, is throttled through the valve port and then sequentially flows through the flow channel and the silencing assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an expansion valve. BACKGROUND

[0002] An electronic expansion valve is a common throttling element, which is mainly used in a refrigeration system. The electronic expansion valve controls the flow and pressure of refrigerant by changing the opening size of the valve port, so as to realize the compression, cooling and evaporation cycle process of the refrigerant.

[0003] During the use of the electronic expansion valve, discontinuous large bubbles are easily generated in the refrigerant after throttling at the valve port, which generates noise. In order to reduce the noise of the electronic expansion valve, a porous sound-absorbing structure is usually arranged in the valve port flow path of the electronic expansion valve. However, when the electronic expansion valve is in a small opening state, the flow rate of the refrigerant after throttling at the valve port is high, and the kinetic energy is large. The high-speed refrigerant flushing the sound-absorbing block is easy to generate abnormal noise. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide an expansion valve to solve the problem that the flow rate of the refrigerant after throttling at the valve port is high, the kinetic energy is large, and the high-speed refrigerant flushing the sound-absorbing block is easy to generate abnormal noise.

[0005] An expansion valve, which comprises a valve body assembly, a pressure reduction module and a sound-absorbing assembly. The valve body assembly has a valve port, a first side and a second side. The valve port is located between the first side and the second side, and the valve port is in communication with the first side and the second side, respectively. The pressure reduction module and the sound-absorbing assembly are arranged on the second side. The pressure reduction module is located between the valve port and the sound-absorbing assembly, and a flow channel is arranged to communicate the valve port and the sound-absorbing assembly. The expansion valve has a first working condition. When the expansion valve is in the first working condition, the working medium flows from the first side to the valve port, and then flows through the flow channel and the sound-absorbing assembly in sequence after throttling at the valve port.

[0006] In one of the embodiments, the pressure reduction module is arranged in a spaced manner with the valve port, and a first mixing cavity is arranged between the pressure reduction module and the valve port. The first mixing cavity is in communication with the valve port and the flow channel.

[0007] In one of the embodiments, the flow channel comprises a first through-flow channel. The first through-flow channel penetrates through the end face of the pressure reduction module facing the first mixing cavity, and the flow cross-sectional area of the first through-flow channel is smaller than the flow cross-sectional area of the end of the first mixing cavity facing the pressure reduction module.

[0008] In one of the embodiments, the flow cross-sectional area of the first through-flow channel is S1, the flow cross-sectional area of the valve port is S2, and 0.9S2≤S1≤2S2.

[0009] In one of the embodiments, the extension length of the first through-flow channel is L1, the diameter of the valve port is D1, and 0.5D1≤L1≤6D1.

[0010] In one of the embodiments, the number of the first through flow channels is configured as one, and the first through flow channel is arranged opposite to the valve port; or the number of the first through flow channels is configured as multiple, and the multiple first through flow channels are arranged at intervals around the axis of the valve port.

[0011] The flow channel further comprises a buffer channel, the buffer channel is arranged away from the valve port relative to the first through flow channel, and the flow area of the buffer channel is larger than that of the first through flow channel.

[0012] In one of the embodiments, the flow area of the buffer channel is constant along the direction from the first through flow channel to the sound attenuation assembly; or the flow area of the buffer channel has a trend of increasing along the direction from the first through flow channel to the sound attenuation assembly.

[0013] In one of the embodiments, the valve body assembly comprises a main valve body, a first connecting pipe and a second connecting pipe, the valve port is located in the main valve body, the main valve body is provided with a first interface section connected to the valve port at one end along the axial direction of the main valve body, the side wall of the main valve body is provided with a second interface section connected to the valve port, the second connecting pipe is connected to the second interface section to form a first side, and the first connecting pipe is connected to the first interface section to form a second side; the pressure reduction module is arranged in the first interface section or the first connecting pipe, and the sound attenuation assembly is arranged in the first interface section or the first connecting pipe.

[0014] In one of the embodiments, the sound attenuation assembly is fixedly connected to one end of the first interface section away from the valve port, the inner wall of the one end of the first interface section close to the valve port is provided with a limiting surface, the limiting surface faces the sound attenuation assembly and is arranged at intervals with the sound attenuation assembly; and the pressure reduction module is clamped between the limiting surface and the sound attenuation assembly along the axial direction of the pressure reduction module.

[0015] In one of the embodiments, the valve body assembly comprises a main valve body, a first connecting pipe and a second connecting pipe, the valve port is located in the main valve body, the main valve body is provided with a first interface section connected to the valve port at one end along the axial direction of the main valve body, the side wall of the main valve body is provided with a second interface section connected to the valve port, the first connecting pipe is connected to the first interface section to form a first side, and the second connecting pipe is connected to the second interface section to form a second side; the pressure reduction module is arranged in the second interface section or the second connecting pipe, and the sound attenuation assembly is arranged in the second interface section or the second connecting pipe.

[0016] In one of the embodiments, the sound attenuation assembly comprises at least one sound attenuation block, and the sound attenuation block is configured as a porous structure.

[0017] In one of the embodiments, the sound attenuation assembly further comprises a support, and the at least one sound attenuation block is mounted to the second side through the support.

[0018] In one of the embodiments, the sound attenuation assembly comprises multiple sound attenuation blocks, and the multiple sound attenuation blocks are arranged at intervals along the flow direction of the working medium.

[0019] Compared with the prior art, the expansion valve provided by the application has the following advantages: the pressure reduction module and the sound attenuation assembly are both located on the second side, the pressure reduction module is located between the valve port and the sound attenuation assembly, and a flow channel is formed between the valve port and the sound attenuation assembly. In this way, when the expansion valve is in the first working condition, the high-speed refrigerant that has been throttled through the valve port will first flow through the flow channel of the pressure reduction module, and will not directly wash the sound attenuation assembly. The flow channel increases the flow distance of the refrigerant from being throttled through the valve port to the sound attenuation assembly, so that the refrigerant can be buffered and slowed down in the pressure reduction module before flowing to the sound attenuation assembly. In this way, the kinetic energy of the refrigerant is reduced, the noise generated by the refrigerant washing the sound attenuation assembly is reduced, and the airflow noise can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A cross-sectional view of the expansion valve in the first working condition in Embodiment One provided by the present application;

[0022] Figure 2 A cross-sectional view of the expansion valve in the second working condition in Embodiment One provided by the present application; Figure 1 An enlarged schematic view at A;

[0023] Figure 3 A structural schematic view of the pressure reduction module in one of the embodiments provided by the present application;

[0024] Figure 4 A cross-sectional view of the expansion valve in the first working condition in Embodiment One provided by the present application;

[0025] Reference signs: 100, expansion valve; 10, valve body assembly; 101, valve port; 102, first side; 103, second side; 11, main valve body; 111, first interface section; 112, second interface section; 12, first mixing cavity; 13, first connecting pipe; 131, limiting surface; 14, second connecting pipe; 20, pressure reduction module; 21, flow channel; 211, first through flow channel; 212, buffering channel; 22, contraction section; 30, sound attenuation assembly; 31, bracket; 32, sound attenuation block; 40, sleeve; 50, valve needle assembly. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description of the specification are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0028] In addition, the terms "first", "second", and the like, are used only for descriptive purposes and do not indicate or imply relative importance or a quantity of the indicated features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0029] In the present application, unless otherwise explicitly specified and limited, "on", "under", "above", and "over" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, "above", "over", and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Below", "under", and "underneath" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the associated listed items.

[0031] Embodiment One

[0032] Please refer to Figure 1 and Figure 3The application provides an expansion valve 100, which comprises a valve body assembly 10, a pressure reduction module 20 and a sound attenuation assembly 30. The valve body assembly 10 has a valve port 101, a first side 102 and a second side 103. The valve port 101 is located between the first side 102 and the second side 103 and communicates with the first side 102 and the second side 103 respectively. The pressure reduction module 20 and the sound attenuation assembly 30 are both located on the second side 103. The pressure reduction module 20 is located between the valve port 101 and the sound attenuation assembly 30 and is provided with a flow channel 21 which communicates the valve port 101 and the sound attenuation assembly 30. The expansion valve 100 has a first working condition, which is a heating mode. When the expansion valve 100 is in the first working condition, the working medium flows from the first side 102 to the valve port 101 and then flows through the flow channel 21 and the sound attenuation assembly 30 in sequence after throttling at the valve port 101. The working medium can be refrigerant.

[0033] The pressure reduction module 20 and the sound attenuation assembly 30 are both located on the second side 103. The pressure reduction module 20 is located between the valve port 101 and the sound attenuation assembly 30 and is provided with a flow channel 21 which communicates the valve port 101 and the sound attenuation assembly 30. In this way, when the expansion valve 100 is in the first working condition, the high-speed flowing refrigerant after throttling at the valve port 101 will flow through the flow channel 21 of the pressure reduction module 20 first and will not directly flush to the sound attenuation assembly 30. The flow channel 21 increases the flow distance of the refrigerant from throttling at the valve port 101 to the sound attenuation assembly 30, so that the refrigerant can slow down in the pressure reduction module 20 before flowing to the sound attenuation assembly 30. In this way, it is beneficial to reduce the kinetic energy of the refrigerant and reduce the noise generated by the refrigerant flushing the sound attenuation assembly 30, thereby effectively reducing the airflow noise.

[0034] The expansion valve 100 further comprises a sleeve 40. The valve body assembly 10 comprises a main valve body 11, a first connecting pipe 13 and a second connecting pipe 14. The valve port 101 is provided on the main valve body 11 or is separately provided from the main valve body 11 and fixedly connected to the main valve body 11. The sleeve 40 is axially sleeved on one end of the main valve body 11. The main valve body 11 is further provided with a first interface section 111 which communicates with the valve port 101 at the end of the main valve body 11 away from the sleeve 40. The side wall of the main valve body 11 is provided with a second interface section 112 which communicates with the valve port 101. The second connecting pipe 14 is connected to the second interface section 112 to form the first side 102. The first connecting pipe 13 is connected to the first interface section 111 to form the second side 103.

[0035] As Figure 1As shown, according to the access direction of the expansion valve 100 and the requirement of the system, when the expansion valve 100 is in the first working condition, the refrigerant enters the main valve body 11 from the side along the second connecting pipe 14 and flows out of the main valve body 11 from the end along the first connecting pipe 13. That is, the refrigerant flows through the valve port 101 first, and then flows through the pressure reduction module 20 and the sound attenuation assembly 30. In this way, when the valve port 101 is at a small opening degree, the high-speed refrigerant flowing out of the valve port 101 first passes through the pressure reduction module 20 to slow down before flowing to the sound attenuation assembly 30, so that the noise generated by the refrigerant flushing the sound attenuation assembly 30 can be reduced.

[0036] The pressure reduction module 20 is arranged at the first interface section 111, and can be arranged integrally with the first interface section 111 or separately from the first interface section 111. The pressure reduction module 20 can also be arranged at the first connecting pipe 13, and can be arranged integrally with the first connecting pipe 13 or separately from the first connecting pipe 13. The sound attenuation assembly 30 is arranged at the first interface section 111, and can be arranged integrally with the first interface section 111 or separately from the first interface section 111. The sound attenuation assembly 30 can also be arranged at the first connecting pipe 13, and can be arranged integrally with the first connecting pipe 13 or separately from the first connecting pipe 13. Of course, the pressure reduction module 20 and the sound attenuation assembly 30 can also be arranged at the connection between the first interface section 111 and the first connecting pipe 13. Exemplarily, as shown in Figure 1 and Figure 2 As shown, the sound attenuation assembly 30 is fixedly connected to the end of the first interface section 111 away from the valve port 101, the inner wall of the end of the first interface section 111 close to the valve port 101 is provided with a limiting surface 131, and the limiting surface 131 faces the sound attenuation assembly 30 and is arranged in spaced relation with the sound attenuation assembly 30; the pressure reduction module 20 is clamped between the limiting surface 131 and the sound attenuation assembly 30 along the axial direction of the pressure reduction module 20. The first connecting pipe 13 is sleeved on the outer periphery of the first interface section 111.

[0037] In this way, the sound attenuation assembly 30, the pressure reduction module 20 and the first interface section 111 are conveniently assembled and fixed. Specifically, when the sound attenuation assembly 30, the pressure reduction module 20 and the first interface section 111 are assembled, the pressure reduction module 20 can be first assembled into the first interface section 111 and abut against the limiting surface 131; then the sound attenuation assembly 30 can be assembled into the first interface section 111 and abut against the pressure reduction module 20; finally, the sound attenuation assembly 30 and the first interface section 111 are fixedly connected. The sound attenuation assembly 30 can be riveted or welded to the first interface section 111. Further, the end of the pressure reduction module 20 close to the valve port 101 is provided with a contraction section 22, and the outer diameter of the pressure reduction module 20 is reduced at the contraction section 22, so that the contraction section 22 is conveniently assembled into the first interface section 111.

[0038] As shown in Figure 1 and Figure 2As shown, the pressure reduction module 20 is spaced apart from the valve port 101, and the first mixing cavity 12 is formed between the pressure reduction module 20 and the valve port 101. Specifically, the first mixing cavity 12 is formed between the end face of the pressure reduction module 20, the end face of the valve port 101, and the wall face of the second side 103. The first mixing cavity 12 is in communication with the valve port 101 and the flow channel 21. By providing the first mixing cavity 12, the flow distance of the refrigerant from the valve port 101 to the sound attenuation assembly 30 is further extended.

[0039] Further, in an embodiment, the flow channel 21 includes a first through-flow channel 211 that penetrates the pressure reduction module 20 towards the end face of the first mixing cavity 12, and the flow cross-sectional area of the first through-flow channel 211 is smaller than the flow cross-sectional area of the first mixing cavity 12 towards the end face of the pressure reduction module 20. In this way, the refrigerant flowing out of the first mixing cavity 12 is throttled when flowing through the first through-flow channel 211.

[0040] Further, in an embodiment, the flow channel 21 further includes a buffer passage 212 that is disposed away from the valve port 101 relative to the first through-flow channel 211, and the flow cross-sectional area of the buffer passage 212 is larger than the flow cross-sectional area of the first through-flow channel 211.

[0041] In this way, when the expansion valve 100 is in the first working condition, the refrigerant throttled by the valve port 101 first flows into the first mixing cavity 12, then flows into the first through-flow channel 211, and then flows into the buffer passage 212, and finally flows towards the sound attenuation assembly 30. Moreover, since the flow cross-sectional area of the first through-flow channel 211 is smaller than the flow cross-sectional area of the first mixing cavity 12 towards the end face of the pressure reduction module 20, and the flow cross-sectional area of the buffer passage 212 is larger than the flow cross-sectional area of the first through-flow channel 211, the refrigerant is throttled for the first time when flowing through the valve port 101, is slowed down for the first time when flowing through the first mixing cavity 12, is throttled for the second time when flowing through the first through-flow channel 211, and is slowed down for the second time when flowing through the buffer passage 212.

[0042] When the expansion valve is in a small opening state, the flow rate of the valve body decreases, the supercooling degree of the refrigerant before flowing into the valve port 101 increases, and the refrigerant is in a high supercooling pure liquid state. After the refrigerant in the high supercooling pure liquid state passes through the valve port 101, it becomes a high-speed gas-liquid two-phase state or a small supercooling pure liquid state. The higher the liquid phase proportion in the refrigerant, the more likely it is to produce cavitation phenomenon when the refrigerant flushes the sound attenuation assembly 30, thereby producing noise. The higher the supercooling degree of the refrigerant before flowing into the valve port 101, the higher the liquid phase proportion in the refrigerant after flowing out of the valve port 101, and the more likely it is to produce cavitation phenomenon. Cavitation phenomenon refers to the formation of bubbles in a liquid due to a decrease in pressure below the saturated vapor pressure of the liquid, and the rapid collapse of these bubbles when the pressure is restored, releasing a large amount of energy, forming a high temperature, high pressure, and strong shock wave.

[0043] In the embodiment, the refrigerant after the deceleration buffering in the first mixing cavity 12 can be throttled for the second time through the first passing flow channel 211. In the small opening state of the valve port 101, if the refrigerant flowing out of the valve port 101 is in a gas-liquid two-phase state, the proportion of the gas-phase refrigerant in the gas-liquid two-phase refrigerant can be increased after the second throttling through the first passing flow channel 211; if the refrigerant flowing out of the valve port 101 is in a small supercooling degree pure liquid state, the refrigerant can be converted into a gas-liquid two-phase state after the second throttling through the first passing flow channel 211, so that the cavitation phenomenon caused by the refrigerant flushing the sound attenuation assembly 30 can be relieved, and the noise can be reduced. After the refrigerant flows out of the first passing flow channel 211, the pressure can be further reduced and the speed can be further buffered in the buffering channel 212. That is, in the embodiment, when the expansion valve is in the first working condition, the refrigerant experiences two throttling and two deceleration buffering before contacting the sound attenuation assembly 30, so that the noise generated by the refrigerant flushing the sound attenuation assembly 30 can be significantly reduced.

[0044] Optionally, as shown in Figure 2 The number of the first passing flow channels 211 is configured as one, and one first passing flow channel 211 is arranged opposite to the valve port 101. After the refrigerant is throttled through the valve port 101, the refrigerant flows at a high speed and the phase state is disordered, and the refrigerant is decelerated and buffered when passing through the first mixing cavity 12. Since the flow area of the first passing flow channel 211 is smaller than the flow area of the end of the first mixing cavity 12 towards the pressure reduction module 20, the end surface of the pressure reduction module 20 close to the valve port 101 can shield the refrigerant around the first passing flow channel 211, and the kinetic energy of the refrigerant can be weakened when the refrigerant collides with the end surface of the pressure reduction module 20 close to the valve port 101. Then, the first passing flow channel 211 rectifies the phase-disordered refrigerant, and the phase-disordered refrigerant collides with each other, and the kinetic energy is weakened again.

[0045] Alternatively, the number of the first passing flow channels 211 can also be configured as multiple, and the multiple first passing flow channels 211 are distributed around the axis of the valve port 101.

[0046] The flow area of the first passing flow channel 211 is S1, the flow area of the valve port 101 is S2, and 0.9S2≤S1≤2S2. It can be understood that if S1 is too small, the refrigerant flow through the first passing flow channel 211 will be too small, and if S1 is too large, it is difficult to shield and throttle the refrigerant. Therefore, 0.9S2≤S1≤2S2 is set to ensure that the first passing flow channel 211 has a throttling effect on the refrigerant, and to avoid too small refrigerant flow through the first passing flow channel 211. For example, S1 can be 0.9S2, S1 can be S2, S1 can be 1.5S2, or S1 can be 2S2.

[0047] As shown in Figure 2As shown, the first through-flow channel 211 has an extension length L1, and the valve port 101 has a diameter D1, and 0.5D1≤L1≤6D1. It can be understood that, since the flow area of the first through-flow channel 211 is smaller than that of the buffer channel 212, the wall thickness of the position where the first through-flow channel 211 is located is greater than that of the position where the buffer channel 212 is located, and the structural strength of the position where the first through-flow channel 211 is located is greater than that of the position where the buffer channel 212 is located, therefore, if L1 is too small, the structural strength of the pressure reduction module 20 will be affected, and if L1 is too large, the processing difficulty of the first through-flow channel 211 will be increased. Therefore, by setting 0.5D1≤L1≤6D1, the structural strength of the pressure reduction module 20 is ensured, and the processing of the first through-flow channel 211 is facilitated. For example, L1 can be 0.5D1, L1 can be D1, L1 can be 4D1, L1 can be 4.5D1, L1 can be 6D1, etc.

[0048] Optionally, in an embodiment, the flow area of the buffer channel 212 is constant along the direction from the first through-flow channel 211 to the sound attenuation assembly 30.

[0049] Alternatively, in another embodiment, the flow area of the buffer channel 212 increases along the direction from the first through-flow channel 211 to the sound attenuation assembly 30. Specifically, the flow area of the buffer channel 212 can uniformly increase along the direction from the first through-flow channel 211 to the sound attenuation assembly 30, that is, the buffer channel 212 has a horn shape with a small end close to the first through-flow channel 211 and a large end away from the first through-flow channel 211.

[0050] The sound attenuation assembly 30 comprises at least one sound attenuation block 32, and the sound attenuation block 32 is configured as a porous structure.

[0051] Optionally, in one of the embodiments, the sound attenuation block 32 is configured as a sintered filter screen block, and the number of the sound attenuation blocks 32 is configured as multiple, and the multiple sound attenuation blocks 32 are distributed along the flow direction of the refrigerant. It should be noted that the multiple sound attenuation blocks 32 refer to the number of the sound attenuation blocks 32 being two or more.

[0052] The sound attenuation assembly 30 can further comprise a bracket 31, and the sound attenuation block 32 is mounted on the second side 103 through the bracket. Specifically, the number of the sound attenuation blocks 32 can be configured as two, and the two sound attenuation blocks 32 are respectively mounted on the two ends of the bracket 31.

[0053] Further, as shown in FIG. 2, the sound attenuation assembly 30 can further comprise a sound attenuation block 32, and the sound attenuation block 32 is configured as a porous structure. Figure 4As shown, the expansion valve 100 is a bidirectional valve, and the expansion valve 100 also has a second working condition, which is a refrigeration mode. When the expansion valve 100 is in the second working condition, the refrigerant enters the main valve body 11 from the end along the first connecting pipe 13, and flows out of the main valve body 11 from the side along the second connecting pipe 14. In the actual operation of the expansion valve 100, when the system is just running, or the refrigerant is insufficient, or the economizer or the heat exchanger area of the outdoor unit in the system is insufficient, the refrigerant may not be supercooled enough before flowing through the valve port 101. That is, the refrigerant first flows through the sound attenuation assembly 30 and the pressure reduction module 20, and then flows through the valve port 101. In this way, when the expansion valve 100 switches to the second working condition, and the refrigerant entering the first connecting pipe 13 is not supercooled enough before flowing through the valve port 101, the refrigerant contains a large amount of bubbles at this time, and the refrigerant can first flow through the sound attenuation assembly 30 and be refined through the porous structure in the sound attenuation assembly 30 to reduce noise.

[0054] As shown in the drawings, Figure 1 The expansion valve 100 also includes a sleeve 40 and a valve needle assembly 50, the sleeve 40 is fixedly connected to the main valve body 11 and surrounds the main valve body 11 to form a working space, and the valve needle assembly 50 is movably installed in the working space and can extend into the valve port 101 to adjust the opening size of the valve port 101.

[0055] Embodiment two

[0056] This embodiment is similar to embodiment one, and the expansion valve 100 includes a valve body assembly 10, a pressure reduction module 20, and a sound attenuation assembly 30. The valve body assembly 10 has a valve port 101, a first side 102, and a second side 103. The expansion valve 100 also includes a sleeve 40, and the valve body assembly 10 includes a main valve body 11, a first connecting pipe 13, and a second connecting pipe 14. The valve port 101 is provided on the main valve body 11 or is separately provided on the main valve body 11 and is fixedly connected to the main valve body 11. The sleeve 40 is axially sleeved on one end of the main valve body 11 along the main valve body 11. The main valve body 11 is provided with a first interface section 111 which is connected to the valve port 101 and is away from the sleeve 40 along the axial direction of the main valve body 11. The side wall of the main valve body 11 is provided with a second interface section 112 which is connected to the valve port 101.

[0057] The same parts will not be described again. The difference between this embodiment and embodiment one is that, according to the access direction of the expansion valve 100 and the needs of the system, the first connecting pipe 13 is connected to the first interface section 111 to form the first side 102, and the second connecting pipe 14 is connected to the second interface section 112 to form the second side 103. That is, in this embodiment, the pressure reduction module 20 and the sound attenuation assembly 30 are located on the side of the main valve body 11.

[0058] When the expansion valve 100 is in the first working condition, the refrigerant enters the main valve body 11 from the first side 102 and flows out from the second side 103. Specifically, the refrigerant flows through the valve port 101, the pressure reduction module 20 and the sound attenuation assembly 30 in sequence. In this way, when the valve port 101 is at a small opening degree, the high-speed refrigerant flowing out of the valve port 101 first passes through the pressure reduction module 20 to slow down before flowing to the sound attenuation assembly 30, thereby reducing the noise generated by the refrigerant flushing the sound attenuation assembly 30.

[0059] When the expansion valve 100 is in the second working condition, the refrigerant enters the main valve body 11 from the second side 103 and flows out from the first side 102. The refrigerant flows through the sound attenuation assembly 30, the pressure reduction module 20 and the valve port 101 in sequence. In this way, when the expansion valve 100 switches to the second working condition and the refrigerant flowing into the first side 102 before flowing through the valve port 101 is insufficiently supercooled, the refrigerant contains a large amount of bubbles. At this time, the refrigerant first flows through the sound attenuation assembly 30, and the bubbles are first refined by the porous structure in the sound attenuation assembly 30 to reduce noise.

[0060] The pressure reduction module 20 is arranged in the second interface section 112 and can be arranged integrally with the second interface section 112 or separately from the second interface section 112. The pressure reduction module 20 can also be arranged in the second connecting pipe 14 and can be arranged integrally with the second connecting pipe 14 or separately from the second connecting pipe 14. The sound attenuation assembly 30 is arranged in the second interface section 112 and can be arranged integrally with the second interface section 112 or separately from the second interface section 112. The sound attenuation assembly 30 can also be arranged in the second connecting pipe 14 and can be arranged integrally with the second connecting pipe 14 or separately from the second connecting pipe 14. Of course, the pressure reduction module 20 and the sound attenuation assembly 30 can also be arranged at the connection between the second connecting pipe 14 and the second interface section 112.

[0061] In summary, the expansion valve 100 provided by the present application can solve the noise problem caused by the high supercooling degree of the refrigerant flowing into the first side 102 before flowing through the valve port 101 when the expansion valve 100 is in the first working condition, in which the refrigerant flows into the first side 102 and flows out from the second side 103 and flows through the valve port 101, the pressure reduction module 20 and the sound attenuation assembly 30 in sequence. When the expansion valve 100 switches to the second working condition, the refrigerant flows into the second side 103 and flows out from the first side 102, and flows through the sound attenuation assembly 30, the pressure reduction module 20 and the valve port 101 in sequence, thereby solving the noise problem caused by the insufficient supercooling degree of the refrigerant flowing into the second side 103 before flowing through the valve port 101. The expansion valve 100 provided by the present application includes but is not limited to an electronic expansion valve.

[0062] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0063] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An expansion valve characterized by, The expansion valve (100) comprises a valve body assembly (10), a pressure reduction module (20) and a sound attenuation assembly (30), the valve body assembly (10) has a valve port (101), a first side (102) and a second side (103), the valve port (101) is located between the first side (102) and the second side (103), and the valve port (101) is in communication with the first side (102) and the second side (103) respectively; The pressure reduction module (20) and the sound attenuation assembly (30) are both arranged on the second side (103), the pressure reduction module (20) is located between the valve port (101) and the sound attenuation assembly (30), and a flow channel (21) is formed to communicate the valve port (101) and the sound attenuation assembly (30); Wherein, the expansion valve has a first working condition, and when the expansion valve is in the first working condition, the working medium flows from the first side (102) to the valve port (101), and then flows through the flow channel (21) and the sound attenuation assembly (30) in sequence after throttling through the valve port (101).

2. The expansion valve according to claim 1, characterized by, The pressure reduction module (20) is arranged separately from the valve port (101), and a first mixing chamber (12) is formed between the pressure reduction module (20) and the valve port (101), the first mixing chamber (12) communicates the valve port (101) and the flow channel (21).

3. The expansion valve according to claim 2, wherein The flow channel (21) comprises a first through-flow channel (211), the first through-flow channel (211) penetrates through the end face of the pressure reduction module (20) towards the first mixing chamber (12), and the flow cross-sectional area of the first through-flow channel (211) is smaller than that of the one end of the first mixing chamber (12) towards the pressure reduction module (20).

4. The expansion valve according to claim 3, characterized in that, The flow cross-sectional area of the first through-flow channel (211) is S1, the flow cross-sectional area of the valve port (101) is S2, and 0.9S2≤S1≤2S2.

5. The expansion valve according to claim 3, wherein The extension length of the first through-flow channel (211) is L1, the diameter of the valve port (101) is D1, and 0.5D1≤L1≤6D1.

6. The expansion valve according to claim 3, wherein The number of the first through-flow channels (211) is one, and one first through-flow channel (211) is arranged opposite to the valve port (101); Alternatively, the number of the first through-flow channels (211) is multiple, and multiple first through-flow channels (211) are arranged at intervals around the axis of the valve port (101).

7. The expansion valve according to claim 3, wherein The flow channel (21) further comprises a buffer channel (212), the buffer channel (212) is arranged away from the valve port (101) relative to the first through-flow channel (211), and the flow cross-sectional area of the buffer channel (212) is larger than that of the first through-flow channel (211).

8. The expansion valve according to claim 7, characterized by Along the direction from the first through-flow channel (211) to the sound attenuation assembly (30), the flow cross-sectional area of the buffer channel (212) is constant; Alternatively, along the direction from the first through-flow channel (211) to the sound attenuation assembly (30), the flow cross-sectional area of the buffer channel (212) shows an increasing trend.

9. The expansion valve of claim 1, wherein The valve body assembly (10) comprises a main valve body (11), a first connecting pipe (13) and a second connecting pipe (14), the valve port (101) is located on the main valve body (11), the main valve body (11) is provided with a first interface section (111) communicating with the valve port (101) at one end along the axial direction of the main valve body (11), the side wall of the main valve body (11) is provided with a second interface section (112) communicating with the valve port (101), the second connecting pipe (14) is connected with the second interface section (112) to form the first side (102), and the first connecting pipe (13) is connected with the first interface section (111) to form the second side (103). The pressure reducing module (20) is arranged in the first interface section (111) or the first connecting pipe (13), and the sound attenuation assembly (30) is arranged in the first interface section (111) or the first connecting pipe (13).

10. The expansion valve according to claim 9, wherein The sound attenuation assembly (30) is fixedly connected to one end of the first interface section (111) away from the valve port (101), the inner wall of one end of the first interface section (111) close to the valve port (101) is provided with a limiting surface (131), and the limiting surface (131) is arranged towards and spaced from the sound attenuation assembly (30). The pressure reducing module (20) is clamped between the limiting surface (131) and the sound attenuation assembly (30) along the axial direction of the pressure reducing module (20).

11. The expansion valve of claim 1, wherein The valve body assembly (10) comprises a main valve body (11), a first connecting pipe (13) and a second connecting pipe (14), the valve port (101) is located on the main valve body (11), the main valve body (11) is provided with a first interface section (111) communicating with the valve port (101) at one end along the axial direction of the main valve body (11), the side wall of the main valve body (11) is provided with a second interface section (112) communicating with the valve port (101), the first connecting pipe (13) is connected with the first interface section (111) to form the first side (102), and the second connecting pipe (14) is connected with the second interface section (112) to form the second side (103). The pressure reducing module (20) is arranged in the second interface section (112) or the second connecting pipe (14), and the sound attenuation assembly (30) is arranged in the second interface section (112) or the second connecting pipe (14).

12. The expansion valve of claim 1, wherein The sound attenuation assembly (30) comprises at least one sound attenuation block (32), and the sound attenuation block (32) is configured as a porous structure.

13. The expansion valve of claim 12, wherein, The sound attenuation assembly (30) further comprises a support (31), and at least one sound attenuation block (32) is mounted on the second side (103) through the support (31).

14. The expansion valve of claim 12, wherein, The sound attenuation assembly (30) comprises a plurality of sound attenuation blocks (32), and the plurality of sound attenuation blocks (32) are arranged in a spaced manner along the flow direction of the working medium.

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