Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve body and a valve element, the valve body is provided with a first cavity, a medium inlet and a medium outlet, the medium inlet and the medium outlet are communicated with the first cavity, the valve element is located in the first cavity, and the medium flow is controlled by adjusting the flow area of the medium outlet. Wherein the medium inlet and the medium outlet are located at the two ends of the valve body respectively, so that the electronic expansion valve forms a structure similar to a linear pipe fitting, the pipeline arrangement environment that an external liquid inlet pipeline and an external liquid outlet pipeline are located at the two ends of the valve body respectively can be met, and customer layout and installation are facilitated; and the radial size of the electronic expansion valve is reduced, and the occupied space is reduced.

Description

Technical Field

[0001] This invention relates to the field of flow control valve design and manufacturing technology, specifically to an electronic expansion valve. Background Technology

[0002] An electronic expansion valve is a precision flow control element widely used in refrigeration systems. It can accurately control the refrigerant flow rate, ensuring the system's operating efficiency and stability.

[0003] Generally, an electronic expansion valve consists of a stator, a valve body, and a valve core. The valve body is the basic structure of the electronic expansion valve, usually made of high-quality materials, and has a channel and orifice that accommodate and allow the flow of the medium. The flow rate of fluid media such as refrigerant is adjusted by controlling the opening and closing degree of the orifice. The stator is fixedly connected to the valve body. The valve core includes a rotor, which is connected to the valve core and drives its movement. Changing the flow area of ​​the orifice by the valve core adjusts the refrigerant flow rate.

[0004] Furthermore, valve bodies typically have a medium inlet and a medium outlet. An inlet connecting pipe communicating with the medium inlet and an outlet connecting pipe communicating with the medium outlet are also provided outside the valve body. The inlet connecting pipe is generally located on the side wall of the valve body, communicating with the internal channel of the valve body through the medium inlet on the side wall; the outlet connecting pipe is generally located at the end of the valve body, communicating with the internal channel of the valve body through the medium outlet at the end of the valve body. Therefore, the inlet and outlet connecting pipes are perpendicular to each other (at least the end sections of both connecting to the valve body are perpendicular to each other). For example, see patent documents with publication numbers CN211117686U, CN212203141U, or CN204478602U, where the medium inlet and outlet on the valve body are located on the side wall and end of the valve body, respectively, with their central axes perpendicular to each other. Therefore, the inlet and outlet connecting pipes are perpendicular to each other at least in the parts connecting to the valve body, and are concentrated at one end of the valve body, resulting in a large overall space occupied by the valve. Summary of the Invention

[0005] In view of this, the present invention provides an electronic expansion valve in which the medium inlet and medium outlet are located at the two ends of the valve body, which not only meets the pipeline layout requirements where the external liquid inlet pipe and the external liquid outlet pipe are located at the two ends of the valve body, but also helps to reduce the radial dimension of the electronic expansion valve and reduce its overall space occupation.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] An electronic expansion valve includes a valve body and a valve core. The valve body has a first cavity and a medium inlet and a medium outlet communicating with the first cavity. The valve core is located in the first cavity. The medium flow rate is controlled by adjusting the flow area of ​​the medium outlet. The medium inlet and the medium outlet are located at opposite ends of the valve body.

[0008] Optionally, in the above-mentioned electronic expansion valve, the valve core is provided with a first channel, which is connected to the medium inlet and the first cavity.

[0009] Optionally, in the above-mentioned electronic expansion valve, the valve body includes an inner shaft located in the first cavity, and the inner shaft is provided with the medium inlet through it;

[0010] The valve core includes a rotor and a main shaft. The main shaft is located in the internal through hole of the rotor and is coaxially connected to the rotor. The main shaft is provided with the first channel. One end of the main shaft is threadedly connected to the inner shaft, and the other end is provided with a cylindrical control end that cooperates with the medium outlet to control the medium flow rate.

[0011] Optionally, in the above-described electronic expansion valve, the spindle includes:

[0012] An internal threaded hole is used for threaded connection with the internal shaft.

[0013] The second cavity is connected to the internal threaded hole;

[0014] The side wall opening communicates with the second cavity to form the first channel.

[0015] Optionally, in the above-mentioned electronic expansion valve, the main shaft is rotatably disposed in the internal through hole of the rotor and is circumferentially limited with the rotor.

[0016] Optionally, the above-mentioned electronic expansion valve also includes a bushing and a limiting connection:

[0017] The bushing is located between the rotor and the main shaft, is fixedly connected to the rotor, and has a clearance fit with the main shaft; the side wall of the bushing is provided with a first strip-shaped limiting hole extending in the circumferential direction;

[0018] The limiting connector is connected to the main shaft, and its end extending out of the side wall of the main shaft is located in the first strip-shaped limiting hole, and can reciprocate along the length direction of the first strip-shaped limiting hole.

[0019] Alternatively, in the above-mentioned electronic expansion valve, the outer wall of the main shaft is provided with a second strip-shaped limiting hole extending in the circumferential direction;

[0020] The limiting connector protrudes from the inner wall of the bushing and extends into the second strip-shaped limiting hole, and can reciprocate along the length of the second strip-shaped limiting hole.

[0021] Optionally, in the above-described electronic expansion valve, the valve body further includes a cylindrical component and an inlet connector, the inlet connector comprising a first connecting portion and an inner shaft:

[0022] Both the inner shaft and the valve core are located inside the cylindrical component;

[0023] The first connecting part is connected to the inlet end of the cylindrical component and to the inner shaft;

[0024] The medium inlet passes through the first connecting part and the inner shaft.

[0025] Optionally, in the above-mentioned electronic expansion valve, the valve body further includes an outlet connector, which is fixedly connected to the outlet end of the cylindrical component and is provided with the medium outlet.

[0026] Optionally, in the above-described electronic expansion valve, the valve body further includes:

[0027] Cylindrical components;

[0028] An inlet connector includes a first connecting part and an inner shaft; the first connecting part is connected to the inlet end of the cylindrical member and is provided with the medium inlet;

[0029] The valve core includes:

[0030] A rotor is located inside the cylindrical member, and the first channel is formed between the outer wall of the rotor and the inner wall of the cylindrical member;

[0031] The main shaft is located in the internal through hole of the rotor and is coaxially connected to the rotor. One end of the main shaft is threaded to the inner shaft, and the other end is provided with a cylindrical control end that cooperates with the medium outlet to control the medium flow rate.

[0032] Optionally, in the above-mentioned electronic expansion valve, the end of the valve core is provided with a cylindrical control end that cooperates with the medium outlet to control the medium flow rate. When the electronic expansion valve is in a fully closed state, a gap is left between the cylindrical control end and the medium outlet for the medium to flow through.

[0033] Compared with the prior art, the electronic expansion valve provided by the present invention has a structure similar to a straight pipe because the medium inlet and medium outlet are located at the two ends of the valve body, which can meet the pipeline layout environment where the external liquid inlet pipe and the external liquid outlet pipe are located at the two ends of the valve body, which is convenient for customers to arrange and install. Moreover, it is beneficial to reduce the radial dimension of the electronic expansion valve and reduce its space occupation. Attached Figure Description

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a schematic diagram of the external structure of an electronic expansion valve provided in the first specific embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the internal structure of an electronic expansion valve in a fully open state, as provided in the first specific embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the internal structure of an electronic expansion valve in a semi-open state, provided as a first specific embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the internal structure of an electronic expansion valve in a fully closed state, as provided in the first specific embodiment of the present invention.

[0039] Figure 5 This is an exploded structural diagram of a valve core provided in the first specific embodiment of the present invention.

[0040] Figure 6 This is an exploded structural diagram of the inlet assembly, valve core, and outlet assembly provided in the first specific embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of the internal structure of an electronic expansion valve provided in a second specific embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of the internal structure of another electronic expansion valve provided in a second specific embodiment of the present invention.

[0043] in:

[0044] 1-Inlet connection pipe, 2-Outlet connection pipe, 3-Valve core,

[0045] 4-Stator, 5-First connector, 6-Valve body, 7-Second connector

[0046] 31-Main shaft, 32-Limiting connector, 33-Bushing, 34-Rotor

[0047] 311 - Cylindrical control end, 330 - First strip-shaped limiting hole,

[0048] 3101 - Side wall opening, 3102 - Second cavity, 3103 - Internal threaded hole, 3104 - Mounting hole.

[0049] 51 - Limiting protrusion, 71 - Limiting slot,

[0050] 60 - Valve seat, 61 - Inlet connector, 62 - Outlet connector, 63 - Cylindrical component

[0051] 611 - First connecting part, 612 - Inner shaft,

[0052] 100 - Medium inlet, 200 - Medium outlet, 300 - First channel. Detailed Implementation

[0053] This invention provides an electronic expansion valve with its medium inlet and medium outlet located at both ends of the valve body. This not only meets the requirements of pipeline layout environments where external liquid inlet and external liquid outlet pipelines are located at both ends of the valve body, but also helps to reduce the radial dimension of the electronic expansion valve and reduce its overall space occupation.

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] First Specific Embodiment

[0056] Please see Figures 1 to 6 The first specific embodiment of the present invention provides an electronic expansion valve, which includes a valve body 6 and a valve core 3. The valve body 6 has a first cavity, and a medium inlet 100 and a medium outlet 200 communicating with the first cavity. The medium inlet 100 is located at one end of the valve body 6, and the medium outlet 200 is located at the other end of the valve body 6 via a valve seat 60. That is, the medium outlet 200 is formed within the valve body 6 through a specifically designed valve seat 60. The valve core 3 is located in the first cavity and generally has a cylindrical control end 311. By controlling the positional relationship between the cylindrical control end 311 and the valve seat 60, the flow area of ​​the medium outlet 200 can be adjusted, thereby achieving the purpose of controlling the medium flow rate.

[0057] In this electronic expansion valve, the medium inlet 100 is generally connected to an external liquid inlet pipe via an inlet connecting pipe 1, and the medium outlet 200 is generally connected to an external liquid outlet pipe via an outlet connecting pipe 2. Since the medium inlet 100 and medium outlet 200 are located at opposite ends of the valve body 6, the inlet connecting pipe 1 and outlet connecting pipe 2 are also located at opposite ends of the valve body 6. This results in the electronic expansion valve having a structure similar to a straight pipe fitting, which accommodates piping environments where the external liquid inlet and external liquid outlet pipes are located at opposite ends of the valve body 6. This facilitates customer layout and installation, and also helps to reduce the radial dimension of the electronic expansion valve, thus reducing its space occupation.

[0058] In practical implementation, the medium inlet 100 and the medium outlet 200 can be located at both ends of the valve body 6 and their central axes can be collinear. That is, the inlet connecting pipe 1 and the outlet connecting pipe 2 can be located at both ends of the valve body 6 and their central axes can be collinear. This allows the electronic expansion valve to meet the condition that the external liquid inlet pipe and the external liquid outlet pipe are located at both ends of the valve body 6, collinearly arranged, and the medium flows in the same direction. It also helps to reduce the radial dimension of the electronic expansion valve and reduce the space it occupies.

[0059] Alternatively, in other embodiments, the medium inlet 100 and the medium outlet 200 can be located at both ends of the valve body 6, with their central axes close to the same straight line and parallel to each other. That is, the inlet connecting pipe 1 and the outlet connecting pipe 2 are located at both ends of the valve body 6, with their central axes close to the same straight line and parallel to each other. In this case, the electronic expansion valve can meet the condition that the external liquid inlet pipe and the external liquid outlet pipe are located at both ends of the valve body 6, close to the same straight line, parallel to each other, and with the same medium flow direction. It is also beneficial to reduce the radial dimension of the electronic expansion valve and reduce its space occupation.

[0060] Alternatively, in other embodiments, the medium inlet 100 and medium outlet 200 at both ends of the valve body 6 can be designed with non-collinear and non-parallel central axes. That is, the inlet connecting pipe 1 and the outlet connecting pipe 2 are located at both ends of the valve body 6, but the central axes have a certain angle. This electronic expansion valve can at least meet the situation where the external liquid inlet pipe and the external liquid outlet pipe are located at both ends of the valve body 6. Compared with the electronic expansion valve with the inlet connecting pipe 1 and the outlet connecting pipe 2 arranged vertically, it can also reduce the radial dimension of the electronic expansion valve and reduce the space occupied.

[0061] In some embodiments, the medium inlet 100 and the medium outlet 200 are located not only at both ends of the valve body 6, but also at both ends of the valve core 3. The valve core 3 has a first channel 300 inside, which communicates with the medium inlet 100 and the medium outlet 200 located at both ends of the valve body. The valve core structure will be further described below with the example of the first channel 300 being located inside the valve core 3.

[0062] Please see Figures 2 to 6 In some embodiments, a stator 4 is generally fixedly mounted on the outside of the valve body 6, and an inner shaft 612 is provided in the first internal cavity. The inner shaft 612 is coaxially arranged with the internal through hole of the stator 4, and the medium inlet 100 is provided through the inner shaft 612. Correspondingly, the valve core includes a rotor 34 and a main shaft 31. The rotor 34 is rotatably arranged in the first internal cavity of the valve body 6; the main shaft 31 is located in the internal through hole of the rotor 34 and coaxially connected to the rotor 34. One end of the main shaft 31 is threadedly connected to the inner shaft 612, and the other end is provided with a cylindrical control end 311 adapted to the shape of the medium outlet 200. When the main shaft 31 moves forward / backward along its own central axis, it can control the actual length of the cylindrical control end 311 extending into the valve seat 60, thereby adjusting the flow cross-section size of the medium outlet 200 (including the fully closed position, the fully open position, and other positions between the fully closed position and the fully open position to obtain an appropriate flow cross-section), thereby regulating the medium flow rate entering and exiting the electronic expansion valve. Furthermore, the main shaft 31 is provided with a first channel 300, so that the medium inlet 100 and the medium outlet 200 located at both ends of the valve body 6 are connected through the first channel 300 inside the main shaft 31.

[0063] Specifically, a coil 41 is installed inside the stator 4, and the rotor 34 is a permanent magnet. When the electronic expansion valve receives an electrical signal from the controller, the stator 4 generates a magnetic field that drives the rotor 34 to rotate around its own axis, thereby driving the main shaft 31 to rotate. At this time, the main shaft 31 rotates while moving axially under the threaded drive of the inner shaft 612, thereby adjusting the flow cross-section of the medium outlet 200 and controlling the opening and closing state and flow rate of the electronic expansion valve. It can be seen that the threaded structure between the inner shaft 612 and the main shaft 31, combined with the rotation of the rotor 34, constitutes a linear drive mechanism that can drive the valve core 3 to move axially without the need for bearings. This simplifies the internal structure of the electronic expansion valve and helps reduce manufacturing costs.

[0064] It should be noted that the axial movement of the valve core mentioned in this article specifically includes both forward and reverse movement of the valve core along its own central axis. Forward movement of the valve core refers to the process of the electronic expansion valve's medium outlet 200 gradually opening and the flow rate gradually increasing; its full stroke includes the movement of the valve core 3 from... Figure 4 The fully closed position shown is moved to Figure 2 The fully open position shown; the reverse movement of the valve core refers to the process in which the medium outlet 200 of the electronic expansion valve is gradually blocked and closed by the cylindrical control end 311, and the flow rate is gradually reduced. Its full stroke includes the valve core 3 moving from... Figure 2 The fully open position shown is moved to Figure 4 The fully closed position is shown in the diagram. Of course, electronic expansion valves, in addition to... Figure 2 and Figure 4In addition to the fully open and fully closed states shown, the valve core 3 is also in an intermediate state where it is in any position between the fully open and fully closed positions, for example, see [reference needed]. Figure 3 The half-open position shown.

[0065] In some embodiments, the inner shaft 612 is hollow (due to the presence of the medium inlet 100), and the valve core main shaft 31 is also hollow. Fluid media such as refrigerant can pass through this hollow structure and flow to the medium outlet 200 located at the outlet end of the valve body 6 before exiting outside the valve body 6. See details... Figures 2 to 6 The main shaft 31 is provided with an internal threaded hole 3103, a second cavity 3102, and a side wall opening 3101, wherein: the internal threaded hole 3103 is located inside the end of the main shaft 31 near the valve body inlet (i.e., Figures 2 to 4 The first channel 300 is formed by connecting the inner shaft 612 to the inner shaft 612 (located inside the left end of the main shaft 31) and communicating with the inner threaded hole 3103. The second cavity 3102 is located inside the main shaft 31 and communicates with the inner threaded hole 3103 to allow the medium to flow. The side wall opening 3101 is located on the side wall of the main shaft 31 and communicates with the second cavity 3102 to form the first channel 300 mentioned above. When the medium enters the valve body 6 from the medium inlet 100 (located inside the inner shaft 612) at one end of the valve body 6 and then flows out from the medium outlet 200 (located inside the outlet connector 62) at the other end of the valve body 6, the specific path is as follows: inlet connecting pipe 1 → medium inlet 100 of inner shaft 612 → second cavity 3102 of main shaft 31 → side wall opening 3101 of main shaft 31 → medium outlet 200 of outlet connector 62 → outlet connecting pipe 2.

[0066] In some embodiments, the main shaft 31 is rotatably disposed within the internal through-hole of the rotor 34 and is circumferentially limited to the rotor 34. That is, the main shaft 31 is located within the internal through-hole of the rotor 34, can rotate relative to the rotor 34 at a certain angle, and when the main shaft 31 rotates relative to the rotor 34 to a specific position, the two can be relatively fixed to achieve circumferential limitation. In short, within a certain angle range, the main shaft 31 can reciprocate relative to the rotor 34, and the two can rotate synchronously when circumferentially limited.

[0067] For example, see Figure 5 and Figure 6 In some embodiments, the valve core 3 is provided with a bushing 33 and a limiting connector 32. The bushing 33 is located between the rotor 34 and the main shaft 31, and is fixedly connected to the rotor 34. The bushing 33 is also circumferentially limited to the main shaft 31 via the limiting connector 32 (i.e., the bushing 33 and the main shaft 31 are circumferentially engaged). Therefore, when the rotor 34 rotates around its own axis, it can rotate the bushing 33 along with it, and subsequently, through the limiting connector 32, it can rotate the main shaft 31 along with it.

[0068] Specifically, the bushing 33 and the rotor 34 can be fixedly connected by adhesive. However, this is not a limitation. In other embodiments, the fixed connection between the rotor 34 and the bushing 33 can also be achieved by other means, and the present invention does not specifically limit this.

[0069] Specifically, the limiting connector 32 can be a radially protruding structure protruding from the side wall of the spindle 31, capable of engaging with the limiting hole in the inner wall of the bushing 33 to achieve a circumferential limiting connection between the spindle 31 and the bushing 33. Alternatively, the limiting connector 32 can also be a shaft-like component (pin) inserted into the internal hole of the spindle 31. In this case, the side wall of the spindle 31 is provided with a mounting hole 3104 for installing the limiting connector 32, and the length of the limiting connector 32 is greater than the depth of the mounting hole 3104, so that the end of the limiting connector 32 extending out of the mounting hole 3104 can engage with the limiting hole in the inner wall of the bushing 33 to achieve a circumferential limiting connection between the spindle 31 and the bushing 33. However, this is not a limitation; in other embodiments, a circumferential limiting connection between the spindle 31 and the bushing 33 can also be achieved in other ways, and this invention does not specifically limit this.

[0070] Considering that, under normal circumstances, when an electronic expansion valve is closed for a period of time and then restarted, it often requires a relatively large force to open. Therefore, in some embodiments, the valve core 3 is provided with an anti-jamming structure. During startup, the rotor 34 can be controlled to generate an impact force and impact the main shaft 31 through the limiting connector 32, thereby releasing the jammed state of the main shaft 31 and ensuring the normal startup and operation of the electronic expansion valve.

[0071] For example, see Figure 5The bushing 33 is fitted around the main shaft 31 with a clearance fit. The side wall of the bushing 33 has a first circumferentially extending strip-shaped limiting hole 330, meaning the length of the first strip-shaped limiting hole 330 extends circumferentially along the side wall of the bushing 33. Correspondingly, the end of the limiting connector 32 extending outside the side wall of the main shaft 31 is located within the first strip-shaped limiting hole 330 and can reciprocate along the length of the first strip-shaped limiting hole 330. Therefore, when the controller sends an initial signal to move the rotor 34, the first strip-shaped limiting hole 330 on the side wall of the bushing 33 allows the rotor 34 and the bushing 33 to generate an acceleration, enabling the bushing 33 to impact the limiting connector 32 through the inner wall of the first strip-shaped limiting hole 330, thereby generating a large instantaneous impact force. This impact force can effectively release the jammed state of the main shaft 31. Moreover, when the controller sends an initial signal to make the rotor 34 move, if the bushing 33 hits the limiting connector 32 for the first time, but the jammed state of the main shaft 31 is not released, the bushing 33 will rebound back to its original position and then hit a second time, or even more times, until the main shaft 31 is released from the jammed state and rotates with the rotor 34, finally realizing the reopening of the valve core and preventing jamming. This method has high reliability.

[0072] In specific implementation, two first strip-shaped limiting holes 330 can be symmetrically provided at both ends of the same diameter of the bushing 33; or, in other embodiments, only one first strip-shaped limiting hole 330 or three or more first strip-shaped limiting holes 330 can be provided on the side wall of the bushing 33, as long as the bushing 33 can achieve the above-mentioned circumferential limiting connection and anti-jamming function through the cooperation relationship between the first strip-shaped limiting hole 330 and the corresponding limiting connector 32.

[0073] Alternatively, in other embodiments, one or more second strip-shaped limiting holes extending circumferentially along the main shaft can be provided on the outer wall of the main shaft 31, that is, the length direction of each second strip-shaped limiting hole extends circumferentially along the outer wall of the main shaft 31; the bushing 33 is sleeved on the outside of the main shaft 31 and is clearance-fitted with the main shaft 31; one or more corresponding limiting connectors 32 are fixedly connected to the inner wall of the bushing 33, protruding radially inward relative to the inner wall of the bushing 33, and the end of the limiting connector 32 extending out of the inner wall of the bushing 33 is located in the second strip-shaped limiting hole on the outer wall of the main shaft 31, and can reciprocate along the length direction of the second strip-shaped limiting hole. When the controller gives an initial signal to make the rotor 34 move, the rotor 34 and the bushing 33 first generate an acceleration, so that the bushing 33 can move with the limiting connector 32 in the second strip-shaped limiting hole on the outer side wall of the main shaft 31 and hit the inner wall of the second strip-shaped limiting hole, thereby generating a large instantaneous impact force. This impact force can also effectively release the jammed state of the main shaft 31.

[0074] In some embodiments, the valve body 6 includes a cylindrical member 63 (preferably a thin-walled cylinder), an inlet connector 61, and an outlet connector 62, wherein: the inlet connector 61 includes a first connecting portion 611 and an inner shaft 612; the first connecting portion 611 is fixedly connected to the inlet end of the cylindrical member 63 and communicates with the inlet connecting pipe 1; the inner shaft 612 is located in a first cavity inside the cylindrical member 63 and connected to the first connecting portion 611; the inner shaft 612 and the first connecting portion 611 are internally connected and have a medium inlet 100. One end of the medium inlet 100 communicates with the inlet connecting pipe 1, and the other end communicates with the first cavity inside the cylindrical member 63; the outlet connector 62 is fixedly connected to the outlet end of the cylindrical member 63, and has a medium outlet 200 inside. The medium outlet 200 communicates with the outlet connecting pipe 2 and communicates with the first cavity inside the cylindrical member 63.

[0075] Furthermore, the stator 4 is sleeved on the outside of the cylindrical member 63 and fixedly connected to it; the valve core 3 includes a rotor 34 and a main shaft 31, located in the first cavity of the cylindrical member 63 and between the inlet connector 61 and the outlet connector 62. The main shaft 31 is threadedly connected to the inner shaft 612, and a first channel 300 is provided inside the main shaft 31. Moreover, the end of the main shaft 31 is provided with a cylindrical control end 311 that cooperates with the medium outlet 200 to control the medium flow rate. The front end of the cylindrical control end 311 has a specially designed tapered shape. When the valve core 3 moves axially, the gap between the cylindrical control end 311 and the medium outlet 200 in the outlet connector 62 changes accordingly, thereby realizing flow regulation. It can be seen that the valve core structure is compact and small in size, and the internal structure of the valve body 6 and the valve core structure are very simple, resulting in low production costs.

[0076] However, this is not the only option. In other embodiments, the cylindrical control end 311 can be configured as a cylindrical structure, and correspondingly, the medium outlet 200 is a conical orifice. Thus, when the cylindrical control end 311 is inserted into the conical orifice medium outlet 200, the annular gap formed between the outer wall of the cylindrical control end 311 and the inner wall of the medium outlet 200 constitutes a channel allowing the medium to flow through. When the cylindrical control end 311 moves axially within the conical orifice medium outlet 200, the area of ​​the annular gap between them can be adjusted to increase or decrease, and this structure can also achieve flow regulation.

[0077] Furthermore, in some embodiments, when the electronic expansion valve is in the fully closed state, i.e., when the valve core 3 is in the fully closed position, a very small gap remains between the cylindrical control end 311 at the front end of the main shaft 31 of the valve core 3 and the medium outlet 200 in the outlet connector 62, meaning that a portion of the medium can always flow through. For example, the maximum cross-sectional area of ​​the cylindrical control end 311 used to seal the medium outlet 200 within the medium outlet 200 can be set to be smaller than the minimum opening area corresponding to the medium outlet 200. This ensures that when the valve core 3 is in the fully closed position, a very small gap remains between the cylindrical control end 311 at the front end of the main shaft 31 of the valve core 3 and the medium outlet 200 in the outlet connector 62, allowing a portion of the medium to flow through. Therefore, although the valve core 3 moves with both rotational motion and linear motion along the axial direction, this gap ensures that there is no friction between the cylindrical control end 311 at the front end of the main shaft 31 of the valve core 3 and the side wall of the medium outlet 200 in the valve body outlet connector 62, which is beneficial for improving the service life of the valve core 3.

[0078] In some embodiments, the inlet connector 61 is an integral structural component, and its first connecting portion 611 is fixedly installed on and sealed to the inlet end of the cylindrical component 63 by laser welding. The cylindrical component 63 is connected by a fixed connector (e.g., Figure 1 The first connector 5 and the second connector 7 shown are fixedly connected to the stator 4, and the first connecting part 611 is provided with an inlet connecting pipe 1 by induction / furnace brazing. In addition, the outlet connector 62 is fixedly installed on the outlet end of the cylindrical member 63 by laser welding and is sealed to it, and the outlet connector 62 is provided with an outlet connecting pipe 2 by induction / furnace brazing.

[0079] Please see below. Figure 2 A second connector 7 is provided on the outer wall of the inlet end of the cylindrical member 63, and the second connector 7 is provided with a limiting slot 71; correspondingly, the first connector 5 is fixedly connected to the stator 4, and a limiting protrusion 51 adapted to the limiting slot 71 is provided near the end of the cylindrical member 63. Thus, the relative fixation between the cylindrical member 63 and the stator 4 can be achieved by the first connector 5 and the second connector 7.

[0080] However, this is not the only option. In other embodiments, the fixed connection between the inlet connecting pipe 1, the outlet connecting pipe 2, the cylindrical component 63 and the stator 4 can also be achieved in other ways. This invention does not impose any specific limitations on this.

[0081] Tests have shown that the electronic expansion valve provided in this embodiment of the invention has high adjustment sensitivity and accuracy, low hysteresis, and a long service life.

[0082] Second specific embodiment

[0083] A second embodiment of the present invention provides an electronic expansion valve, which differs from the first embodiment described above only in that a first channel 300 is provided at a location other than the main shaft 31 and the inner shaft 612. For example, please refer to... Figure 7 and Figure 8 The inlet connector 61 is located at the inlet end of the cylindrical member 63, and includes a first connecting portion 611 connected to the inlet end of the cylindrical member 63, and an inner shaft 612 connected to the first connecting portion 611. The inner shaft 612 is threadedly connected to the main shaft 31. The first connecting portion 611 is provided with one or more media inlets 100 communicating with the inlet connecting pipe 1 at a position off-center from the central axis. The media inlets 100 are located radially outside the inner shaft 612. Figure 7 As shown, multiple medium inlets 100 are approximately parallel to the inner shaft 612, such as... Figure 8 As shown, multiple medium inlets 100 are inclined relative to the inner shaft 612, which is not specifically limited in this invention. At this time, a first channel 300 that allows medium flow is formed between the inner wall of the cylindrical member 63 and the outer wall of the rotor 34, and the inner shaft 612 can be a solid shaft, so there is no need to open the side wall opening 3101 on the main shaft 31.

[0084] Furthermore, in order to prevent impurities in the medium (such as iron filings) from affecting the rotor when passing through the first channel 300, a filter device can be provided in the inlet connecting pipe 1 or upstream of it in a preferred embodiment.

[0085] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0086] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0087] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electronic expansion valve, comprising a valve body (6) and a valve core (3), wherein the valve body (6) is provided with a first cavity, and a medium inlet (100) and a medium outlet (200) communicating with the first cavity, the valve core (3) being located in the first cavity, and the medium flow rate being controlled by adjusting the flow area of ​​the medium outlet (200), characterized in that, The medium inlet (100) and the medium outlet (200) are located at the two ends of the valve body (6), respectively.

2. The electronic expansion valve according to claim 1, characterized in that, The valve core (3) has a first channel (300) inside, which is connected to the medium inlet (100) and the first cavity.

3. The electronic expansion valve according to claim 2, characterized in that, The valve body (6) includes an inner shaft (612) located in the first cavity, and the inner shaft (612) is provided with the medium inlet (100) through it; The valve core includes a rotor (34) and a main shaft (31). The main shaft (31) is located in the internal through hole of the rotor (34) and is coaxially connected to the rotor (34). The main shaft (31) is provided with the first channel (300). One end of the main shaft (31) is threadedly connected to the inner shaft (612), and the other end is provided with a cylindrical control end (311) that cooperates with the medium outlet (200) to control the medium flow rate.

4. The electronic expansion valve according to claim 3, characterized in that, The spindle (31) includes: An internal threaded hole (3103) is provided for threaded connection with the inner shaft (612); The second cavity (3102) communicates with the internal threaded hole (3103); The side wall opening (3101) communicates with the second cavity (3102) to form the first channel (300).

5. The electronic expansion valve according to claim 3, characterized in that, The main shaft (31) is rotatably disposed in the internal through hole of the rotor (34) and is circumferentially limited with the rotor (34).

6. The electronic expansion valve according to claim 5, characterized in that, It also includes bushings (33) and limiting connectors (32): The bushing (33) is located between the rotor (34) and the main shaft (31), is fixedly connected to the rotor (34), and is clearance-fitted with the main shaft (31); the side wall of the bushing (33) is provided with a first strip-shaped limiting hole (330) extending in the circumferential direction; The limiting connector (32) is connected to the main shaft (31), and its end extending out of the side wall of the main shaft (31) is located in the first strip-shaped limiting hole (330), and can reciprocate along the length direction of the first strip-shaped limiting hole (330).

7. The electronic expansion valve according to claim 5, characterized in that, It also includes bushings (33) and limiting connectors (32): The bushing (33) is located between the rotor (34) and the main shaft (31), is fixedly connected to the rotor (34), and is clearance-fitted with the main shaft (31); The outer wall of the main shaft (31) is provided with a second strip-shaped limiting hole extending in the circumferential direction; The limiting connector (32) protrudes from the inner wall of the bushing (33) and extends into the second strip-shaped limiting hole, and can reciprocate along the length direction of the second strip-shaped limiting hole.

8. The electronic expansion valve according to claim 3, characterized in that, The valve body (6) further includes a cylindrical component (63) and a first connecting portion (611): The inner shaft (612) and the valve core (3) are both located inside the cylindrical component (63); The first connecting part (611) is connected to the inlet end of the cylindrical member (63) and to the inner shaft (612); The medium inlet (100) passes through the first connecting part (611) and the inner shaft (612).

9. The electronic expansion valve according to claim 2, characterized in that, The valve body (6) also includes: Cylindrical component (63); The inlet connector (61) includes a first connecting part (611) and an inner shaft (612); the first connecting part (611) is connected to the inlet end of the cylindrical member (63) and is provided with the medium inlet (100); The valve core includes: The rotor (34) is located inside the cylindrical member (63), and the first channel (300) is formed between the outer wall of the rotor (34) and the inner wall of the cylindrical member (63); The main shaft (31) is located in the internal through hole of the rotor (34) and is coaxially connected to the rotor (34). One end of the main shaft (31) is threadedly connected to the inner shaft (612), and the other end is provided with a cylindrical control end (311) that cooperates with the medium outlet (200) to control the medium flow rate.

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that, The valve core (3) is provided with a cylindrical control end (311) at its end, which cooperates with the medium outlet (200) to control the medium flow rate. When the electronic expansion valve is in a fully closed state, there is a gap between the cylindrical control end (311) and the medium outlet (200) for the medium to flow through.

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