An electrically operated valve

Abstract

The application provides an electric valve, which comprises a valve seat assembly and a valve core assembly, the valve seat assembly comprises a valve port part, the valve core assembly can be matched with the valve port part, the valve seat assembly comprises a first channel and a second channel, the first channel and the second channel can be communicated through a valve port of the valve port part; the valve core assembly comprises a valve core main body and a noise reduction part, the noise reduction part can block part of fluid from flowing into the electric valve through the valve core main body, the speed of the fluid flowing into the valve core main body can be slowed down through the arrangement of the noise reduction part, the phenomenon of vortex flow generated in the valve core main body can be reduced, the refrigerant directly flowing into the valve core main body after throttling expansion can be reduced, resonance cavity can be avoided, and fluid noise can be reduced.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, specifically to an electric valve for an automotive thermal management system. Background Technology

[0002] In related technologies, electric valves include a valve seat assembly and a valve core assembly. The valve seat assembly has a valve seat portion and a valve port. The valve core assembly can cooperate with the valve port. When the required flow rate in the system is large, the valve port also needs to be made larger, and the valve core assembly also needs to be made larger accordingly. At this time, the lower end of the valve core assembly is often provided with a large receiving cavity to reduce the weight of the valve core assembly. However, with this setting, a considerable portion of the refrigerant fluid entering from the inlet, except for a portion that flows directly to the outlet, will bypass the bottom of the valve core assembly and flow into the receiving cavity at the lower end of the valve core assembly. Since the refrigerant flow velocity is relatively fast after expansion, the possibility of abnormal noise generation is greatly increased. Utility Model Content

[0003] The purpose of this application is to provide an electric valve that helps reduce fluid noise.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] An electric valve includes a valve seat assembly and a valve core assembly. The valve seat assembly includes a valve port portion, and the valve core assembly is capable of cooperating with the valve port portion. The valve seat assembly includes a first channel and a second channel, which are connected through the valve port portion. The valve core assembly includes a valve core body and a noise reduction part, which is capable of blocking some fluid from flowing into the electric valve through the valve core body.

[0006] In one technical solution provided in this application, the electric valve includes a valve seat assembly and a valve core assembly. The valve seat assembly includes a valve port, and the valve core assembly can cooperate with the valve port. The valve seat assembly includes a first channel and a second channel, which can communicate with each other through the valve port of the valve port. The valve core assembly includes a valve core body and a noise reduction part. The noise reduction part can block some fluid from flowing into the electric valve through the valve core body. By setting the noise reduction part, the speed of fluid flowing into the valve core body can be slowed down, which can reduce the phenomenon of eddy currents generated inside the valve core body and reduce the direct flow of refrigerant into the electric valve through the valve core body after throttling and expansion. This can avoid the formation of a resonance cavity and help reduce fluid noise. Attached Figure Description

[0007] Figure 1 This is a front view structural schematic diagram of a valve component according to an embodiment of the electric valve provided in this application;

[0008] Figure 2 yes Figure 1 A cross-sectional view along plane AA of the first embodiment of the valve component shown in the diagram.

[0009] Figure 3 yes Figure 2 The diagram shows a partially enlarged view of the valve component at point A.

[0010] Figure 4 yes Figure 2 A partially enlarged structural schematic diagram at point A of the second embodiment of the first embodiment of the valve component shown in the diagram;

[0011] Figure 5 yes Figure 2 A partially enlarged structural schematic diagram at point A of the third embodiment of the first embodiment of the valve component shown in the diagram.

[0012] Figure 6 yes Figure 5 A bottom view of the valve component shown;

[0013] Figure 7 yes Figure 1 A cross-sectional view of the valve component according to the second embodiment shown along plane AA;

[0014] Figure 8 yes Figure 7 The diagram shows a partially enlarged view of the valve component at point B.

[0015] Figure 9 yes Figure 7 A partially enlarged structural schematic diagram at point B of the third embodiment of the valve component shown;

[0016] Figure 10 yes Figure 7 A partially enlarged structural schematic diagram at point B of the fourth embodiment of the valve component shown;

[0017] Figure 11 yes Figure 2 A partially enlarged structural schematic diagram at point A of the first embodiment of the fifth embodiment of the valve component shown in the diagram;

[0018] Figure 12 yes Figure 11 A three-dimensional structural diagram of the cylindrical portion of the valve component shown;

[0019] Figure 13 yes Figure 11 A partially enlarged structural schematic diagram at point A of the second embodiment of the fifth embodiment of the valve component shown in the diagram;

[0020] Figure 14 yes Figure 13A three-dimensional structural diagram of the cylindrical portion of the valve component shown;

[0021] Figure 15 yes Figure 11 A partially enlarged structural schematic diagram at point A of the third embodiment of the fifth embodiment of the valve component shown in the diagram;

[0022] Figure 16 yes Figure 15 A three-dimensional structural diagram of the cylindrical portion of the valve component shown;

[0023] Figure 17 yes Figure 7 A partially enlarged structural diagram at point B of the sixth embodiment of the valve component shown. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of the utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

[0025] Electric valves are widely used in automotive thermal management systems, such as vehicle air conditioning systems and vehicle battery cooling systems. In these systems, electric valves are generally used as throttling or switching elements. This application uses an electric valve as an example of an electronic expansion valve with throttling function. The electric valve includes a valve component 1, a coil assembly (not shown in the figure), and a valve body (not shown in the figure). The coil assembly is located on the outer periphery of the valve component 1, and the two are sealed together to prevent moisture or other impurities from the external environment from entering the gap between the coil assembly and the valve component 1, thereby preventing corrosion or failure of the component. At least a portion of the valve component 1 is located in the inner cavity formed by the valve body. The valve component 1 is fixedly connected or limited to the valve body. The coil assembly is connected to the valve body by screws. Of course, in other embodiments, the coil assembly and the valve body can be connected by snap-fit ​​or other means.

[0026] refer to Figures 1-17In the embodiment of valve component 1 provided in this application, valve component 1 includes a rotor assembly 11, a valve seat assembly 12, a valve core assembly 13, a nut assembly 14, a valve stem 15, and a sleeve 16. The valve seat assembly 12 is located on the outer periphery of a portion of the valve stem 15 and on the outer periphery of a portion of the valve core assembly 13. The valve seat assembly 12 is fixedly connected to the sleeve 16, and the fixing method includes welding, etc. The sleeve 16 is sleeved on the outer periphery of the rotor assembly 11. The rotor assembly 11 is fixedly connected to or limited to one end of the valve stem 15, and the fixing method includes welding, snap-fit, etc. The nut assembly 14 includes a main body 141 and a connecting plate 142. The connecting plate 142 is fixedly connected to the valve seat assembly 12, and the connection method includes welding, snap-fit, etc. The valve stem 15 is threadedly engaged with the main body 141. The valve seat assembly 12 has a valve port 1211, and the coil assembly includes a stator assembly (not shown in the figure). When the rotor assembly 11 rotates circumferentially under the magnetic field excitation of the stator assembly, the rotor assembly 11 drives the valve stem 15 to rotate. The valve stem 15 can drive the valve core assembly 13 to perform linear reciprocating motion along the axial direction of the electric valve. In this way, the valve core assembly 13 can adjust the opening of the valve port 1211 by moving closer to or further away from the valve port 1211, thereby adjusting the flow rate of the refrigerant through the valve port 1211. The valve seat assembly 12 includes a first channel 1212 and a second channel 1213. The first channel 1212 and the second channel 1213 can be connected through the valve port 1211. In this embodiment, the first channel 1212 can function as an inlet channel, and the second channel 1213 can function as an outlet channel. Of course, the flow directions of the two can be opposite. In some other embodiments, other transmission mechanisms such as planetary gears can be used to drive the valve core assembly 13 by the rotor assembly 11.

[0027] The valve core assembly 13 includes a mounting bracket 134, a spring 135, and an annular member 136. The annular member 136 is located at one end of the valve stem 15 near the valve port 1211. The mounting bracket 134 is located on the upper side of the annular member 136 and axially limits the annular member 136. The mounting bracket 134 is integrally formed with the valve core body 131 or separately formed and then fixed. In the embodiments of this application, the annular member 136 is a bearing. The valve stem 15 is axially limited to the inner ring of the bearing, for example by riveting the valve stem 15 by flange or by snap-fitting with a gasket. The riveting mounting bracket 134 can abut against the outer ring of the bearing. Of course, in other embodiments, the annular member 136 can also be other structures. The valve core assembly 13 has a spring receiving cavity 13b, an annular member 136, a portion of the valve stem 15, and a spring 135 located in the spring receiving cavity 13b. The valve stem 15 is limitedly connected to the valve core assembly 13 via the annular member 136. The spring 135 is located between the valve stem 15 and the bottom wall forming the spring receiving cavity 13b, and the spring 135 can provide driving force for the axial reset of the valve core assembly 13. The valve seat assembly 12 has a valve seat cavity 12a, and the spring receiving cavity 13b communicates with the valve seat cavity 12a. Specifically, there is a gap between the bearing and the inner peripheral wall forming the spring receiving cavity 13b, and a gap between the inner peripheral wall of the fitting 134 and the outer peripheral wall of the valve stem 15. Fluid can communicate between the spring receiving cavity 13b and the valve seat cavity 12a through the gaps in the bearing, the gap between the spring receiving cavity 13b and the bearing, or the gap between the fitting 134 and the valve stem 15, ensuring pressure balance between the spring receiving cavity 13b and the valve seat cavity 12a, thereby ensuring the reliability of the spring 135's drive. In other embodiments, a connecting hole may be provided between the assembly 134 and the annular member 136 to directly connect the spring receiving cavity 13b and the valve seat cavity 12a.

[0028] In the embodiments of the electric valve provided in this application, the valve core assembly 13 includes a valve core body 131 and a noise reduction part 132. The valve core body 131 is integrally formed, and the noise reduction part 132 can block some fluid from flowing into the electric valve through the valve core body 131. This ensures that the fluid that expands after throttling when the valve is opened is buffered by the noise reduction part 132 before flowing into the valve core body 131. This can reduce the working medium from directly entering from the first channel 1212 and flowing directly into the valve core body 131 without obstruction after passing through the valve port 1211. At the same time, it can also reduce the phenomenon of foreign particles entering the valve component 1 through the valve core body 131, thereby causing wear on the thread structure of the nut assembly 14 and the valve stem 15, and thus improving the service life of the electric valve. In other embodiments, the valve core body 131 can be formed and then fixed separately. For example, the valve core body 131 includes a first valve core body 1314 and a second valve core body 1315, which are fixedly connected. The valve core assembly 13 also includes a sealing element, which is located between the first valve core body 1314 and the second valve core body 1315. Alternatively, the sealing element is located in a receiving groove on the outer peripheral wall of the first valve core body 1314 or the outer peripheral wall of the second valve core body 1315. The sealing element can abut against the valve port 1211. The sealing element is located between the first valve core body and the second valve core body, and is fixed by fixing the first valve core body and the second valve core body.

[0029] Alternatively, the first valve core body may have a receiving groove, and the seal may be located in the receiving groove.

[0030] refer to Figures 2-6 In the first embodiment of this application, the noise reduction part 132 is part of the valve core body 131, that is, the noise reduction part 131 and the valve core body 131 are integrally formed. The valve core body 131 includes a valve core cavity 1311. The maximum distance between two points on the radial cross section of the valve core cavity 1311 is defined as L1. The valve core body 131 includes a first sidewall 1312. Here, the first sidewall 1312 is the sidewall segment with the smallest outer diameter of the valve core body 131 that corresponds radially to the valve core cavity 1311. The first sidewall 1312 is located on the outer periphery of the valve core body 131. The outer diameter of the first sidewall 1312 is defined as L2. To satisfy 0≤L1≤0.6L2 and 4mm≤L2≤18mm, the noise reduction part 132, which is integrally formed with the valve core body 131, can reduce the flow rate of fluid directly flowing into the electric valve through the valve core body 131 after throttling and expansion, slow down the speed of fluid flowing into the valve core body 131, reduce the phenomenon of eddy currents generated inside the valve core body 131, reduce the generation of resonance cavities, and thus reduce the noise generated. It can also reduce the phenomenon of foreign particles entering the valve component 1 through the valve core body 131, thereby reducing the wear on the thread structure of the nut assembly 14 and the valve stem 15.

[0031] In this embodiment, the valve core body 131 includes a first cavity 131b, which is located at the axial end of the valve core body 131. The first cavity 131b opens downward and is connected to the valve core inner cavity 1311. The valve core body 131 includes a second sidewall 1313, which is located below the first sidewall 1312. The outer diameter of the second sidewall 1313 is larger than the outer diameter of the first sidewall 1312. At least a portion of the first cavity 131b is radially corresponding to the second sidewall 1313. At this time, the first sidewall 1312 is the sidewall of the main body of the valve core body 131, and the second sidewall 1313 is the sidewall of the protrusion of the valve core body 131. The valve seat assembly 12 includes a first valve seat portion 121 and a second valve seat portion 122. The first valve seat portion 121 and the second valve seat portion 122 are fixedly connected. The connection method includes riveting, welding, etc. The second channel 1213 is located in the first valve seat portion 121, and the first channel 1212 is located in the second valve seat portion 122. The second valve seat portion 122 is fixedly connected to the sleeve 16. The inner radial direction of the sidewall of the first cavity 131b gradually expands towards the valve port 1211. The end of the protrusion has a rounded corner. The valve seat assembly 12 includes a sealing part 123. The sealing part 123 is axially located between the first valve seat 121 and the second valve seat 122. The sealing part 123 can be fixed by fixing the first valve seat 121 and the second valve seat 122. In other embodiments, the sealing part 123 can also be fixed to the valve seat in other ways. The sealing part 123 is made of a soft material, such as rubber or plastic. In other embodiments, the sealing part 123 can be made of plastic or rubber. The valve port 1211 is located in the sealing part 123. The rounded corner can seal with the sealing part 123. This arrangement can reduce the volume of the valve core body 131 and ensure the reliability of the line seal between the valve core body 131 and the valve port 1211. In other embodiments, the sealing part 123 can be omitted, and the valve core body 131 can directly abut and seal with the valve port 1211, which is integrally formed with the valve seat. In other embodiments, the valve core body 131 can be radially sealed with the valve seat assembly 12, in which case the valve seat portion can be integrally formed.

[0032] refer to Figures 2-3In the first embodiment of this example, L1 satisfies L1=0, that is, the valve core inner cavity 1311 is not provided. This can prevent the working medium fluid entering from the first channel 1241212 from flowing into the valve core body 131 after passing through the valve port 1211, thus avoiding the generation of a resonance cavity and reducing noise. The valve core body 131 includes a balance hole 131a. The number of balance holes 131a may be one or more. The balance holes 131a are offset from the central axis of the valve core body 131 and connect the upper and lower spaces of the valve core body 131. The valve seat cavity 12a and the second channel 1213 are connected through the balance holes 131a. In this embodiment, the balance holes 131a penetrate the valve core body 131 and are offset from the spring receiving cavity 13b. There are three balance holes 131a, which are evenly distributed circumferentially around the spring receiving cavity 13b. This can balance the axial pressure of the valve core body 131, which is beneficial to reduce the valve opening resistance and thus reduce the driving force for the operation of the valve component 1.

[0033] refer to Figure 4In the second embodiment of this example, the relationship between L1 and L2 satisfies 0 < L1 < 0.125L2. This can reduce the flow rate of fluid entering from the first channel 1241212 after throttling and expansion through the valve port 1211 into the valve core body 131, thereby reducing noise and relatively reducing the weight of the valve core body 131. In this embodiment, the radial cross-section of the valve core inner cavity 1311 is circular. In other embodiments, the radial cross-section of the valve core inner cavity 1311 can be polygonal, etc. The valve core inner cavity 1311 is connected to the spring receiving cavity 13b and the second channel 1213. That is, the valve core inner cavity 1311 connects the upper and lower spaces of the valve core body 131. This can balance the axial pressure of the valve core body 131, which helps to reduce the valve opening resistance and thus reduce the driving force for the valve component 1. The central axis of the valve core inner cavity 1311 coincides with the central axis of the valve core body 131. Of course, in other embodiments, the central axis of the valve core inner cavity 1311 can deviate from the central axis of the valve core body 131. Furthermore, the valve core body 131 can be further provided with a balance hole 131a, which can accelerate the pressure balance rate of the upper and lower chambers of the valve core body 131 and reduce the weight of the valve core body 131. Of course, the balance hole 131a can also be omitted. In other embodiments, 0.05L2≤L1≤0.1L2; 0.08L2≤L1<0.125L2, which can further increase the rate of communication between the upper and lower cavities of the valve core body 131, while reducing the flow rate into the valve core body 131, thereby reducing the phenomenon of forming a resonance cavity in the valve core inner cavity 1311, and thus reducing noise. In other embodiments, the noise reduction unit 132 may further include a spiral groove or a plurality of uniformly distributed axial grooves located on the inner peripheral wall of the valve core cavity 1311. Here, axial direction includes general axial direction, specifically it can be a threaded groove or a similar threaded groove. The spiral groove or groove extends to the end of the valve core body 131. The spiral groove or groove is integrally formed with the valve core body 131. Specifically, it can be a spiral groove, which can be formed by tapping. The spiral groove or groove is simple in structure. With simple processing, the fluid flowing in from the first channel 1212 can be guided by the spiral groove after throttling into the valve core cavity 1311, thereby slowing down the speed of the refrigerant flowing through the valve core cavity 1311 and avoiding the formation of eddies and resonance cavities in the fluid flowing into the valve core cavity 1311. This reduces the noise generated by the refrigerant flowing directly into the valve core cavity 1311 after throttling expansion. Of course, the spiral groove or groove can also be provided in this embodiment.

[0034] refer to Figures 5-6In the third embodiment of this example, the relationship between L1 and L2 satisfies 0.125L2≤L1≤0.6L2. This can relatively reduce the flow rate of fluid entering from the first channel 124 after throttling and expansion through the valve port 1211 into the valve core body 131, thereby reducing the generation of eddy currents and thus reducing noise. At the same time, it can further help reduce the weight of the valve core body 131. In this embodiment, the valve core assembly 13 includes a flow hole 13c. The valve core inner cavity 1311 communicates with the spring receiving cavity 13b through the flow hole 13c. The central axis of the valve core inner cavity 1311 is offset from the central axis of the valve core body 131. The valve core body 131 is provided with balance holes 131a, which are offset from the valve core inner cavity 1311. There are two balance holes 131a, which are not connected to the valve core inner cavity 1311. This can further accelerate the pressure balance rate of the upper and lower cavities of the valve core body 131 and reduce the weight of the valve core body 131. Of course, in other embodiments, the balance holes 131a can be connected to the valve core inner cavity 1311 or not. In other embodiments, the above-mentioned spiral grooves or recesses can be provided simultaneously to further guide the fluid flowing into the valve core inner cavity 1311, reduce the generation of resonance cavities, and further reduce fluid noise. In other embodiments, 0.125L2≤L1≤0.4L2; 0.2L2≤L1≤0.3L2, which can further reduce the weight of the valve core body 131, increase the rate of communication between the upper and lower cavities of the valve core body 131, and at the same time reduce the flow rate into the valve core body 131, thereby reducing the phenomenon of forming a resonance cavity in the valve core inner cavity 1311, and thus reducing noise.

[0035] refer to Figures 7-8In the second embodiment of this application, the noise reduction part 132 includes a bending structure 1321, which bends radially inward. In this embodiment, the bending structure 1321 is integrally formed with the valve core body 131. In other embodiments, the bending structure 1321 can be separately formed from the valve core body 131 and then fixed. The bending structure 1321 is a structure similar to a gasket or a snap ring, fixed to the end of the valve core body 131. The fixing method includes welding, bonding, interference fit, etc. The bending structure 1321 is located at the end of the valve core body 131. This arrangement is simple in structure. The bending structure 1321 can block part of the fluid flowing in from the first channel 1212 from flowing into the interior of the valve core body 131. At the same time, it can slow down the speed of fluid flowing into the valve core body 131, which can reduce the phenomenon of eddy currents generated inside the valve core body 131, thereby reducing fluid noise. In this embodiment, the aforementioned spiral groove or recess is also provided to further guide the fluid flowing into the valve core cavity 1311, reducing the generation of resonance cavities and further reducing fluid noise. Of course, the spiral groove or recess can also be omitted. The balance hole 131a provided in the valve core body 131 communicates with the valve seat cavity 12a. The valve seat assembly 12 does not have a sealing part 123. The valve port 1211 is integrally formed with the aforementioned valve seat part. The outer surface of the valve core body 131 can be radially sealed with the valve port 1211.

[0036] refer to Figure 9In the third embodiment of this application, the noise reduction part 132 is separately formed from the valve core body 131. The noise reduction part 132 includes a porous structure 1323, at least a portion of which is located in the valve core inner cavity 1311. The porous structure 1323 is columnar or cylindrical and can be made of porous metal filter material. The porous structure 1323 is fixedly connected or limited to the valve core body 131. In this embodiment, the porous structure 1323 is columnar, and its lower side can be limited by a snap ring or directly welded to the valve core body 131. In this embodiment, the porous structure 1323 is columnar, and the valve core assembly 13 includes a mounting portion 133. The mounting portion 133 includes a mounting portion sidewall 133a and a mounting portion top wall 133b. The cavity formed by the mounting portion sidewall 133a forms at least a portion of the valve core inner cavity 1311. The porous structure 1323 and the mounting portion sidewall 133a are clearance-fitted. In other embodiments, the porous structure 1323 and the mounting portion sidewall 133a can be interference-fitted or transition-fitted. In this embodiment, the lower end face of the bent structure 1321 abuts against the lower end face of the porous structure 1323, and the upper end face of the porous structure 1323 abuts against the top wall 133b of the mounting part. The combination of the bent structure 1321 and the lower end face of the porous structure 1323 can act as an axial limiting structure for the porous structure 1323, so that the porous structure 1323 can be stably installed in the inner cavity 1311 of the valve core, avoiding displacement of the porous structure 1323 in the inner cavity 1311 of the valve core and affecting the noise reduction effect. Of course, in other embodiments, the axial limiting of the bent structure 1321 is not required. In other embodiments, the lower side of the porous structure 1323 can be limited by a snap ring or directly welded to the valve core body 131.

[0037] In this embodiment, the fluid in the second channel 1213 can flow into the valve core cavity 1311 through the porous structure 1323. This not only disperses the eddies generated by the fluid entering the valve core cavity 1311, preventing the formation of a resonance cavity and thus avoiding abnormal noise, but also filters the fluid flowing into the valve core cavity 1311, preventing foreign particles in the working fluid from entering the valve component 1 through the valve core cavity 1311 and causing the valve component 1 to become blocked or jammed. Furthermore, the porous structure 1323 has a lighter metal mass for the same volume, reducing the weight of the valve core body 131. The valve core cavity 1311 is connected to the spring receiving cavity 13b through the flow hole 13c, and the balance hole 131a of the valve core body 131 is connected to the valve core cavity 1311. This further accelerates the pressure balance rate between the upper and lower chambers of the valve core body 131 and reduces the weight of the valve core body 131. Of course, the balance hole 131a can be omitted.

[0038] refer to Figure 10In the fourth embodiment of this application, the noise reduction part 132 and the valve core body 131 are separately formed. The noise reduction part 132 includes a second cylindrical part 1325, which includes an extension section 1325b and a protruding section 1325a. The protruding section 1325a is located at the outermost radial periphery of the cylindrical part 1325 and protrudes radially along the extension section 1325b. The second cylindrical part 1325 has a second cavity 1325c, which communicates with the valve core inner cavity 1311. Furthermore, the extension section 1325b is located in the valve core inner cavity 1311. The cylindrical part 1325 is fixedly connected to the valve core assembly 13. The connection method includes welding, interference fit, or interference fit followed by welding. In this embodiment, the inserted section 1325b is clearance-fitted with the inner peripheral wall forming the valve core cavity 1311, and the protruding section 1325a abuts against the lower end face of the valve core body 131. The protruding section 1325a is welded and fixed to the valve core body 1311. The protruding section 1325a can block part of the fluid flowing in from the first channel 1212 from entering the interior of the valve core body 131. This allows most of the fluid flowing in from the first channel 1212 to be guided by the protruding section 1325a to flow directly to the second channel 1213, further reducing the violent collision of fluid at the tail end of the valve core assembly 13 and the formation of separation vortex, thereby reducing fluid noise. The valve core body 131 includes a balance hole 131a, and the second cylindrical portion 1325 has a second cavity 1325c. The second cavity 1325c is connected to the valve core inner cavity 1311, and the valve core inner cavity 1311 is connected to the spring inner cavity 13b. Of course, in other embodiments, the valve core inner cavity 1311 may not be connected to the spring inner cavity 13b, and the pressure of the upper and lower cavities of the valve core body 131 is balanced through the balance hole 131a.

[0039] refer to Figures 11-16In the fifth embodiment of this application, the noise reduction part 132 and the valve core body 131 are separately formed. The noise reduction part 132 includes a cylindrical part 1324, at least a portion of which is located in the valve core inner cavity 1311. The cylindrical part 1324 includes a peripheral wall part 1324a, at least a portion of which is cylindrical. This embodiment schematically shows a cylindrical example; in other embodiments, a square cylindrical shape may also be used. In this embodiment, the cylindrical part 1324 is fixed to the mounting part side wall 133a with an interference fit. In other embodiments, the cylindrical part 1324 and the mounting part side wall 133a may have a clearance fit or a transition fit, or the cylindrical part 1324 may be fixed to the valve core body 131 by welding. The upper end face of the cylindrical part 1324 abuts against the top wall 133b of the mounting part. Of course, in other embodiments, a bending structure 1321 may be provided to serve as an axial limiting structure for the cylindrical part 1324. The balance hole 131a of the valve core body 131 is connected to the valve core inner cavity 1311, which can further accelerate the pressure balance rate of the upper and lower cavities of the valve core body 131 and reduce the weight of the valve core body 131. Of course, the balance hole 131a can be omitted. The peripheral wall portion 1324a includes an upper opening and a lower opening, which are connected. The valve core inner cavity 1311 is connected to the spring inner cavity 13b through the flow hole 13c, that is, the upper cavity of the valve core body 131 is connected to the lower cavity, that is, the valve seat cavity 12a is connected to the second channel 1213. In this embodiment, at least a portion of the cylindrical portion 1324 is located in the first cavity 131b, and the peripheral wall portion 1324a includes an installation guide portion 1324a1. The installation guide portion 1324a1 is located on the upper outer peripheral wall of the peripheral wall portion 1324a. The installation guide portion 1324a1 has rounded corners or beveled corners. This arrangement can guide the installation of the cylindrical portion 1324 and the valve core body 131, reducing the installation difficulty.

[0040] refer to Figures 11-12In the first embodiment of this example, the axial height of the lowest end of the cylindrical portion 1324 is less than the axial height of the lowest end of the valve core body 131. The peripheral wall portion 1324a also includes a flow guide portion 1324b, which is located on the outer peripheral wall below the peripheral wall portion 1324a. The flow guide portion 1324b includes an inclined plane, a curved surface, or a combination of both. The flow guide portion 1324b tends to narrow from top to bottom along the axial direction of the valve core assembly 13. In this embodiment, an implementation of the flow guide portion 1324b as a combination of an inclined plane and a rounded corner (curved surface) is schematically shown. In this way, part of the fluid flowing in from the first channel 1212 can be guided by the side wall forming the first cavity 131b and the flow guide portion 1324b, and flow directly to the second channel 1213. This can help to make the fluid distribution more uniform, make the flow rate more gradual, reduce fluid pressure fluctuations, and further help to reduce noise. Of course, in other embodiments, the axial height of the lowest end of the cylindrical portion 1324 can be greater than the axial height of the lowest end of the valve core body 131, which can help improve the fluid flow direction and reduce the generation of resonance cavities.

[0041] refer to Figures 13-14In the second embodiment of this embodiment, relative to the first embodiment of this embodiment, the lower end of the peripheral wall portion 1324a includes a bent portion 1324c. The bent portion 1324c is bent inward in a radial direction. Here, radial means includes a general radial direction. The lower end opening is located in the bent portion 1324c. At this time, when the axial position of the cylindrical portion 1324 is restricted by the bending structure 1321, it is necessary to ensure that the diameter of the inner peripheral wall forming the lower end opening is smaller than the diameter of the inner peripheral wall of the bending structure 1321. In this embodiment, the cylindrical portion 1324 includes a transition connecting portion 1324d, which transitions between the peripheral wall portion 1324a and the bent portion 1324c. The outer wall portion of the transition connecting portion 1324a can serve as a flow guide portion 1324b. The transition connecting portion 1324d includes an inclined plane, a curved surface, or a combination of both. The flow guide portion 1324b has a tapering trend from top to bottom along the axial direction of the valve core assembly 13. In this embodiment, a schematic implementation of the flow guide portion 1324b with rounded corners (curved surface) is shown. With this configuration, the fluid flow rate into the valve core cavity 1311 is smaller, and most of the fluid can be guided by the transition connecting portion 1324a and flow into the second channel 1213, while being blocked by the bent portion 1324c, which can help to further improve fluid noise. In this embodiment, the peripheral wall portion 1324a has a notch portion 1324a2, which is located at the upper end of the mounting guide portion 1324a1. The number of notches 1324a2 is one or more. In this embodiment, there are four notches 1324a2, which are evenly distributed along the circumference of the cylindrical portion 1324. The notches 1324a2 connect the outer space of the mounting guide portion 1324a1 with the upper and lower openings. This arrangement can prevent liquid from accumulating between the press-fit guide portion 1324a1 and the inner peripheral wall of the valve core body 131, which would cause damage to the relevant structure when the accumulated liquid expands thermally.

[0042] refer to Figures 15-16 In the third embodiment of this example, relative to the second embodiment, the cylindrical portion 1324 further includes a small-diameter cylindrical portion 1324e. The small-diameter cylindrical portion 1324e extends upward from the bent portion 1324c and is positioned relative to the center of the bent portion 1324c. At least a portion of the lower end opening is located in the small-diameter cylindrical portion 1324e. This can help to further prevent fluid from directly flowing into the valve body cavity 1311 and further reduce fluid noise.

[0043] refer to Figure 17In the sixth embodiment of this application, relative to the first to fifth embodiments, the valve core body 131 is a split structure. Along the axial direction, the first valve core body 1314 is located above the second valve core body 1315. The inner diameter of the first valve core body 1314 is larger than the inner diameter of the second valve core body 1315. The valve core inner diameter 1311 is the inner cavity formed by the second valve core body 1315. That is, the noise reduction part 132 is integrally formed with the first valve core body 1314. This can also slow down the speed of fluid flowing into the valve core body 131, reduce the phenomenon of eddy currents generated inside the valve core body 131, avoid the formation of resonance cavities, and help reduce fluid noise. The inner cavities of the first valve core body 1314 and the second valve core body 1315 are connected, and can be connected to the spring receiving cavity 13b through the flow hole 13c, thereby achieving pressure balance between the upper and lower cavities of the valve core body 131. In this embodiment, the valve core body 131 is not provided with a balance hole 131a. Of course, in other embodiments, the valve core body 131 can be provided with a balance hole 131a. The structures of the aforementioned five embodiments can all be used in combination with the structure of this embodiment.

[0044] The above-described embodiments are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications without departing from the concept of this utility model, and these modifications all fall within the protection scope of this utility model.

Claims

1. An electric valve, characterized in that, The electric valve includes a valve seat assembly (12) and a valve core assembly (13). The valve seat assembly (12) includes a valve port (1211). The valve core assembly (13) can cooperate with the valve port (1211). The valve seat assembly (12) includes a first channel (1212) and a second channel (1213). The first channel (1212) and the second channel (1213) can communicate through the valve port (1211). The valve core assembly (13) includes a valve core body (131) and a noise reduction part (132). The noise reduction part (132) can block some fluid from flowing into the electric valve through the valve core body (131).

2. The electric valve according to claim 1, characterized in that, The noise reduction part (132) is part of the valve core body (131). The valve core body (131) includes a valve core cavity (1311). The maximum distance between two points on the radial cross section of the valve core cavity (1311) is L1. The valve core body (131) includes a first sidewall (1312). The first sidewall (1312) is located on the outer periphery of the valve core body (131). The outer diameter of the first sidewall (1312) is L2, which satisfies 0≤L1≤0.6L2 and 4mm≤L2≤18mm.

3. The electric valve according to claim 2, characterized in that, L1=0, the valve core body (131) includes a balance hole (131a), the balance hole (131a) is offset from the central axis of the valve core body (131), and the balance hole (131a) connects the upper and lower spaces of the valve core body (131).

4. The electric valve according to claim 2, characterized in that, The relationship between L1 and L2 satisfies 0 < L1 < 0.125L2. The valve core cavity (1311) connects the upper and lower spaces of the valve core body (131). The central axis of the valve core cavity (1311) coincides with the central axis of the valve core body (131), or the central axis of the valve core cavity (1311) deviates from the central axis of the valve core body (131).

5. The electric valve according to claim 2, characterized in that, The relationship between L1 and L2 satisfies 0.125L2≤L1≤0.6L2; the central axis of the valve core cavity (1311) coincides with the central axis of the valve core body (131), or the central axis of the valve core cavity (1311) deviates from the central axis of the valve core body (131).

6. The electric valve according to claim 1, characterized in that, The noise reduction part (132) includes a bending structure (1321), which is located at the end of the valve core body (131) and is bent radially inward.

7. The electric valve according to claim 4, characterized in that, The noise reduction part (132) includes a spiral groove or a plurality of uniformly distributed axial grooves located on the inner peripheral wall of the valve core cavity (1311), the spiral groove or grooves extending to the end of the valve core body (131).

8. The electric valve according to claim 5, characterized in that, The noise reduction part (132) includes a spiral groove or a plurality of uniformly distributed axial grooves located on the inner peripheral wall of the valve core cavity (1311), the spiral groove or grooves extending to the end of the valve core body (131).

9. The electric valve according to claim 6, characterized in that, The noise reduction part (132) includes a spiral groove or a plurality of uniformly distributed axial grooves located on the inner peripheral wall of the valve core cavity (1311), the spiral groove or grooves extending to the end of the valve core body (131).

10. The electric valve according to claim 1, characterized in that, The noise reduction part (132) and the valve core body (131) are separately formed. The valve core body (131) includes a valve core cavity (1311). The noise reduction part (132) includes a porous structure (1323). At least part of the porous structure (1323) is located in the valve core cavity (1311). Fluid in the second channel (1213) can flow into the valve core cavity (1311) through the porous structure (1323). The porous structure (1323) is fixedly connected or limitedly connected to the valve core body (131).

11. The electric valve according to claim 6, characterized in that, The noise reduction part (132) and the valve core body (131) are separately formed. The valve core body (131) includes a valve core cavity (1311). The noise reduction part (132) includes a porous structure (1323). At least part of the porous structure (1323) is located in the valve core cavity (1311). Fluid in the second channel (1213) can flow into the valve core cavity (1311) through the porous structure (1323). The porous structure (1323) is fixedly connected or limitedly connected to the valve core body (131).

12. The electric valve according to claim 1, characterized in that, The noise reduction part (132) and the valve core body (131) are separately formed. The valve core body (131) includes a valve core inner cavity (1311). The noise reduction part (132) includes a cylindrical part (1324). The cylindrical part (1324) is fixedly connected or limitedly connected to the valve core body (131). At least a portion of the cylindrical part (1324) is located in the valve core inner cavity (1311). The cylindrical part (1324) includes a peripheral wall part (1324a). The peripheral wall portion (1324a) has an upper opening and a lower opening, the upper opening and the lower opening are connected, and the end of the peripheral wall portion (1324a) has a guide portion (1324b) that narrows from top to bottom along the axial direction of the valve core assembly (13); or the lower end of the peripheral wall portion (1324a) includes a bent portion (1324c), the bent portion (1324c) is bent radially inward, and the lower opening is located in the bent portion (1324c).

13. The electric valve according to claim 6, characterized in that, The noise reduction part (132) and the valve core body (131) are separately formed. The valve core body (131) includes a valve core inner cavity (1311). The noise reduction part (132) includes a cylindrical part (1324). The cylindrical part (1324) is fixedly connected or limitedly connected to the valve core body (131). At least a portion of the cylindrical part (1324) is located in the valve core inner cavity (1311). The cylindrical part (1324) includes a peripheral wall part (1324a). The peripheral wall portion (1324a) has an upper opening and a lower opening, the upper opening and the lower opening are connected, and the end of the peripheral wall portion (1324a) has a guide portion (1324b) that narrows from top to bottom along the axial direction of the valve core assembly (13); or the lower end of the peripheral wall portion (1324a) includes a bent portion (1324c), the bent portion (1324c) is bent radially inward, and the lower opening is located in the bent portion (1324c).

14. The electric valve according to claim 13, characterized in that, The cylindrical portion (1324) includes a transition connection portion (1324d), which transitionally connects the peripheral wall portion (1324a) and the bent portion (1324c). The transition connection portion (1324d) includes an inclined plane, a curved surface, or a combination of both. The transition connection portion (1324d) forms at least a partial guide portion (1324b).

15. The electric valve according to claim 14, characterized in that, The cylindrical portion (1324) includes a small-diameter cylindrical portion (1324e), which extends axially upward from the bent portion (1324c), and at least a portion of the lower end opening is located in the small-diameter cylindrical portion (1324e).

16. The electric valve according to claim 1, characterized in that, The noise reduction part (132) and the valve core body (131) are separately formed. The valve core body (131) includes a valve core inner cavity (1311). The noise reduction part (132) includes a second cylindrical part (1325). The second cylindrical part (1325) includes a protruding section (1325a). The protruding section (1325a) abuts against the lower end face of the valve core body (131). The second cylindrical part (1325) has a second cavity (1325c). The second cavity (1325c) communicates with the valve core inner cavity (1311). The protruding section (1325a) can block some of the fluid flowing in from the first channel (1212) from entering the interior of the valve core body (131). The second cylindrical part (1325) is fixedly connected or limitedly connected to the valve core body (131).

17. The electric valve according to claim 16, characterized in that, The second cylindrical portion (1325) includes an extension section (1325b) located in the valve core cavity (1311). The extension section (1325b) abuts against the inner peripheral wall forming the valve core cavity (1311). The second cylindrical portion (1325) is press-fitted to the valve core body (131), and / or the second cylindrical portion (1325) is welded to the valve core body (131).

18. The electric valve according to any one of claims 1-17, characterized in that, The valve core body (131) includes a first valve core body (1314) and a second valve core body (1315). The first valve core body (1314) and the second valve core body (1315) are fixedly connected. The valve core assembly (13) includes a sealing element. The sealing element can abut against the valve port (1211). The sealing element is located between the first valve core body (1314) and the second valve core body (1315). Alternatively, the outer peripheral wall of the first valve core body (1314) or the second valve core body (1315) has a receiving groove, and the sealing element is located in the receiving groove.

19. The electric valve according to claim 18, characterized in that, The inner diameter of the first valve core body (1314) is larger than the inner diameter of the second valve core body (1315), and the valve core inner cavity (1311) is the inner cavity formed by the second valve core body (1315).

20. The electric valve according to any one of claims 1-17, characterized in that, The electric valve includes a valve stem (15), the valve core assembly (13) includes a spring (135), the valve core assembly (13) has a spring receiving cavity (13b), the spring (135) is located in the spring receiving cavity (13b), and the spring (135) is located between the valve stem (15) and the bottom wall forming the spring receiving cavity (13b).

21. The electric valve according to any one of claims 2-5, characterized in that, The valve core body (131) includes a first cavity (131b), which is located at the axial end of the valve core body (131) and is connected to the valve core inner cavity (1311).

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