Electronic expansion valve and air conditioning system with same

Abstract

The utility model provides an electronic expansion valve and an air conditioning system with the electronic expansion valve, and the electronic expansion valve comprises a valve body with a valve cavity; the connecting pipe is fixedly connected with the valve body, the connecting pipe is communicated with the valve cavity, a port of one end, connected with the valve body, of the connecting pipe forms a valve port, and the valve port is used for being matched with a valve needle so as to adjust the flow at the valve port. By means of the technical scheme, the problem that in the prior art, the refrigerant fluid flow area of an electronic expansion valve at a valve port suddenly changes can be solved.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and more specifically, to an electronic expansion valve and an air conditioning system having the same. Background Technology

[0002] Currently, electronic expansion valves are typically used in air conditioning systems to control the flow rate of refrigerant fluid.

[0003] In existing technologies, electronic expansion valves typically include a valve body and a valve needle. The valve body has a valve port, or a valve seat core with a valve port formed on the valve seat core. The valve needle has a tapered section capable of flow regulation. The valve needle can move relative to the valve port, changing the distance between the outer wall of the tapered section and the inner wall of the valve port to regulate the flow rate of refrigerant at the valve port. Currently, a connecting pipe is usually installed on the valve body to connect the valve port to the air conditioning system piping. However, due to the wall thickness of the connecting pipe or installation structure, a transition section often exists at the connection between the valve port and the connecting pipe. The fluid flow area abruptly changes at this transition section, and the transition is not smooth. This results in a rapid change in pressure drop after the refrigerant flows through the valve port, and the refrigerant may generate vortices when flowing through the uneven section, causing noise. Utility Model Content

[0004] This invention provides an electronic expansion valve and an air conditioning system having the same, to solve the problem of abrupt changes in the refrigerant flow area at the valve port in existing electronic expansion valves.

[0005] According to one aspect of the present invention, an electronic expansion valve is provided, comprising: a valve body having a valve cavity; a connecting pipe fixedly connected to the valve body, the connecting pipe communicating with the valve cavity, and a port at one end of the connecting pipe connected to the valve body forming a valve port for cooperating with a valve needle to regulate the flow rate at the valve port.

[0006] Furthermore, the valve body is provided with a plug hole, and the connecting pipe is plugged into the plug hole.

[0007] Furthermore, the valve body includes a valve tube and a valve seat core. The valve tube has a valve cavity and a mounting hole. The valve seat core is inserted into the mounting hole and fixedly connected to the valve tube. The valve seat core has an insertion hole.

[0008] Furthermore, a limiting structure is provided at the insertion hole to restrict the displacement of the connecting pipe into the valve cavity.

[0009] Furthermore, the inner wall of part of the insertion hole protrudes inward in a direction perpendicular to the axis to form a protrusion. The protrusion has a stepped surface, which abuts against the end face of the connecting pipe, and the stepped surface forms a limiting structure.

[0010] Furthermore, the insertion hole has a first hole section and a second hole section that are interconnected, the second hole section is located at the end of the first hole section away from the valve cavity, and the first hole section forms a protrusion.

[0011] Furthermore, a guide sleeve is provided at one end of the insertion hole near the valve cavity. The guide sleeve is guided and cooperates with the valve needle. The insertion hole has a first end and a second end that are arranged opposite to each other. The first end is located on the side of the second end near the valve cavity. A limiting boss is provided at the port of the first end. The guide sleeve is sleeved on the outside of the limiting boss.

[0012] Furthermore, the inner diameter of the limiting boss gradually decreases from the first end to the second end, the inner diameter of the limiting boss near the second end is smaller than the inner diameter of the insertion hole, and the end face of the limiting boss near the second end forms a stepped surface.

[0013] Furthermore, at least part of the connecting pipe has an inner diameter that is less than or equal to the inner diameter of other parts of the connecting pipe.

[0014] Furthermore, at least a portion of the connecting pipe narrows radially to form a capillary channel, the inner diameter of the valve port is D1, the inner diameter of the capillary channel is D2, and 1≤D2 / D1≤2.5.

[0015] Furthermore, the connecting pipe is integrally molded.

[0016] Furthermore, the connecting pipe is welded to the valve body.

[0017] According to another aspect of the present invention, an air conditioning system is provided, the air conditioning system including system piping and an electronic expansion valve, the electronic expansion valve being the aforementioned electronic expansion valve, and the connecting pipe of the electronic expansion valve being connected to the system piping.

[0018] By applying the technical solution of this utility model, a valve port is formed directly at the end of the connecting pipe. The refrigerant fluid passing through the valve chamber can flow into the connecting pipe through the valve port formed by the connecting pipe itself. Compared with the traditional technical solution, the flow area of ​​the refrigerant fluid after throttling through the valve port will not change abruptly. Thus, after the refrigerant fluid flows through the valve port, it will not pass through the uneven area caused by the assembly of the connecting pipe and the valve port, thereby preventing vortex noise and improving the user experience. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of the electronic expansion valve provided in the first embodiment of this utility model is shown;

[0021] Figure 2 A schematic diagram of the structure of the electronic expansion valve provided in the second embodiment of this utility model is shown;

[0022] Figure 3 It shows Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 4 A schematic diagram of the structure of the electronic expansion valve provided in the third embodiment of this utility model is shown;

[0024] Figure 5 A schematic diagram of the structure of the electronic expansion valve provided in the fourth embodiment of this utility model is shown;

[0025] Figure 6 A schematic diagram of the structure of the electronic expansion valve provided in the fifth embodiment of this utility model is shown;

[0026] Figure 7 A schematic diagram of the structure of the electronic expansion valve provided in the sixth embodiment of this utility model is shown;

[0027] Figure 8 It shows Figure 7 A magnified view of a section at point B.

[0028] The above figures include the following reference numerals:

[0029] 100. Valve body; 101. Valve cavity; 102. Guide sleeve;

[0030] 110. Valve pipe; 111. First orifice section; 112. Second orifice section;

[0031] 120. Valve seat core; 121. Limiting boss; 122. Mounting protrusion;

[0032] 200. Connecting pipe; 201. Valve port;

[0033] 210. First paragraph; 220. Second paragraph; 230. Third paragraph;

[0034] 300. Valve needle. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0036] like Figures 1 to 8 As shown, this embodiment of the present invention provides an electronic expansion valve, which includes a valve body 100 and a connecting pipe 200. The valve body 100 has a valve cavity 101. The connecting pipe 200 is fixedly connected to the valve body 100 and communicates with the valve cavity 101. One end of the connecting pipe 200 connected to the valve body 100 forms a valve port 201. The other end of the connecting pipe 200 can be used to communicate with the piping of an air conditioning system. The valve port 201 is used to cooperate with a valve needle 300 to adjust the flow rate at the valve port 201.

[0037] By applying the technical solution of this utility model, a valve port 201 is directly formed at the end of the connecting pipe 200. The refrigerant fluid passing through the valve chamber 101 can flow into the connecting pipe 200 through the valve port 201 formed by the connecting pipe itself. Compared with the traditional technical solution, the flow area of ​​the refrigerant fluid after throttling through the valve port 201 will not change abruptly. Thus, after the refrigerant fluid flows through the valve port 201, it will not pass through the uneven area caused by the assembly of the pipe and the valve port, thereby preventing vortex noise and improving the user experience.

[0038] In this application, the valve body 100 is provided with a plug hole, and the connecting pipe 200 is plugged into the plug hole. The plug hole can increase the mating area between the connecting pipe 200 and the valve body 100 to ensure the stability of the connection between the connecting pipe 200 and the valve body 100.

[0039] Specifically, in some embodiments of this application, a limiting structure is provided at the insertion hole. The limiting structure is used to limit the displacement of the connecting pipe 200 towards the valve cavity 101, provide a positioning reference for the connecting pipe 200, ensure that the connecting pipe 200 is installed in place, and prevent the connecting pipe 200 from moving excessively towards the valve cavity 101.

[0040] Furthermore, the inner wall of part of the insertion hole protrudes inward in a direction perpendicular to the axis to form a protrusion. The protrusion has a stepped surface, which abuts against the end face of the connecting pipe 200, forming a limiting structure. The stepped surface can limit the excessive movement of the connecting pipe 200 to ensure that the connecting pipe 200 can be installed in place and that the valve port 201 is positioned accurately.

[0041] Reference Figure 1 As shown, in the first embodiment of this application, the valve body 100 includes a valve tube 110 and a valve seat core 120. The valve tube 110 has a valve cavity 101 and a mounting hole. The valve seat core 120 is inserted into the mounting hole and fixedly connected to the valve tube 110. The valve seat core 120 has a insertion hole. Through the above arrangement, the sidewall of the insertion hole of the valve seat core 120 can increase the mating area between the connecting tube 200 and the valve body 100, thereby improving the connection strength between the connecting tube 200 and the valve body 100 and improving the structural stability of the overall electronic expansion valve.

[0042] Furthermore, a guide sleeve 102 is provided at one end of the insertion hole near the valve cavity 101. The guide sleeve 102 guides and cooperates with the valve needle 300. The insertion hole has a first end and a second end that are arranged opposite to each other. The first end is located on the side of the second end near the valve cavity 101. A limiting boss 121 is provided at the port of the first end. The guide sleeve 102 is sleeved on the outside of the limiting boss 121. With this arrangement, the guide sleeve 102 can guide the movement of the valve needle 300 to ensure that the valve needle 300 can accurately cooperate with the valve port 201. The limiting boss 121 is used for positioning and insertion of the guide sleeve 102, which facilitates the installation of the guide sleeve 102.

[0043] Reference Figure 2 and Figure 3 As shown, in the second embodiment of this application, the difference from the first embodiment is that the inner diameter of the limiting boss 121 gradually decreases along the direction from the first end to the second end, and the inner diameter of the limiting boss 121 near the second end is smaller than the inner diameter of the insertion hole. With this configuration, the insertion hole has a protrusion formed on the inner wall of the port at one end of the limiting boss 121, and the end face of the limiting boss 121 near the insertion hole forms a stepped surface of the limiting structure. While the limiting boss 121 limits the connection tube 200, it does not interfere with the cooperation between the valve needle 300 and the valve port 201, ensuring the effectiveness of the electronic expansion valve.

[0044] Specifically, a countersunk hole is provided on the inner wall of the valve pipe 110, and the countersunk hole is located on the outer periphery of the mounting hole. An annular mounting protrusion 122 is provided on the outer periphery of the valve seat core 120, and part of the mounting protrusion 122 is located inside the countersunk hole. This facilitates the installation and positioning of the valve seat core 120 and restricts the displacement of the valve seat core 120 relative to the valve pipe 110.

[0045] Furthermore, the valve tube 110 and the valve seat core 120, and the valve seat core 120 and the connecting tube 200 can be connected by welding to improve the strength of the connection and reduce the internal leakage of the electronic expansion valve.

[0046] Reference Figures 4 to 6 As shown, in some embodiments of this application, the inner wall of the valve body 100 forms a valve cavity 101, and the valve body 100 is provided with a plug-in hole, into which the connecting pipe 200 is plugged in. Compared to a design where the valve body is a separate valve pipe 110 and valve seat core 120, this direct connection between the valve body 100 and the connecting pipe 200 reduces the number of parts and facilitates the assembly of the overall electronic expansion valve; furthermore, the connection strength of the connecting pipe 200 is improved by using the plug-in hole to engage with the connecting pipe 200.

[0047] Specifically, the connecting pipe 200 and the valve body 100 can be connected by welding to improve the connection strength between the connecting pipe 200 and the valve body 100.

[0048] like Figure 4 As shown, in the third embodiment of this application, the connecting pipe 200 is a straight pipe with a constant flow area. One end of the connecting pipe 200 is inserted into the insertion hole of the valve body 100, and the other end can be connected to the air conditioning system pipeline, or connected to the air conditioning system pipeline after connecting the adapter structure, so as to standardize the electronic expansion valve product. When connecting pipelines of different diameters, only the adapter of different sizes and specifications needs to be replaced.

[0049] Furthermore, the connecting pipe 200 may have a first section 210, a second section 220, and a third section 230 connected sequentially. The first section 210 is connected to the valve body 100. The inner diameter of the second section 220 gradually increases from the first section 210 to the third section 230. The inner diameter of the first section 210 is smaller or larger than the inner diameter of the third section 230. This allows the third section 230 to adapt to system pipelines of different sizes and specifications, enabling the electronic expansion valve to be directly connected to the pipeline system, adapting to different air conditioning systems, and improving the compatibility of the electronic expansion valve.

[0050] like Figure 5 As shown, in the fourth embodiment of this application, the connecting pipe 200 has a first segment 210, a second segment 220 and a third segment 230 connected in sequence. The first segment 210 is connected to the valve body 100. The inner diameter of the second segment 220 gradually increases along the direction from the first segment 210 to the third segment 230. The inner diameter of the first segment 210 is smaller than the inner diameter of the third segment 230.

[0051] like Figure 6 As shown, in the fifth embodiment of this application, the connecting pipe 200 has a first section 210, a second section 220 and a third section 230 connected in sequence. The first section 210 is connected to the valve body 100. The inner diameter of the second section 220 gradually decreases along the direction from the first section 210 to the third section 230. The inner diameter of the first section 210 is greater than the inner diameter of the third section 230.

[0052] Similarly, in the first and second embodiments of this application, the connecting pipe 200 can also be configured as a structure of a first segment 210, a second segment 220 and a third segment 230 connected in sequence, with the first segment 210 connected to the valve seat core 120, and the inner diameter of the second segment 220 gradually decreasing or increasing along the direction from the first segment 210 to the third segment 230.

[0053] Specifically, the connecting pipe 200 can be a one-piece molded structure, and the valve port 201 is directly processed from the connecting pipe 200 to ensure the integrity of the connecting pipe 200.

[0054] Specifically, the connecting pipe 200 can be formed from brass material to facilitate the forming of the connecting pipe 200.

[0055] like Figure 7 and Figure 8As shown, taking the sixth embodiment of this application as an example, the insertion hole has a first hole segment 111 and a second hole segment 112 that are interconnected. The second hole segment 112 is located at the end of the first hole segment 111 away from the valve cavity 101. The inner diameter of the second hole segment 112 is larger than the inner diameter of the first hole segment 111, and the inner diameter of the first hole segment 111 is larger than the inner diameter of the connecting pipe 200. The first hole segment 111 forms a protrusion. There is a stepped surface between the first hole segment 111 and the second hole segment 112. The stepped surface abuts against the end face of the connecting pipe 200, and the stepped surface forms a limiting structure. Through the above configuration, the stepped surface between the first hole segment 111 and the second hole segment 112 can limit the displacement of the connecting pipe 200, providing a positioning basis for the installation of the connecting pipe 200 and the insertion hole, ensuring that the connecting pipe 200 can be installed in place. Similarly, in other embodiments of this application, the insertion hole can also be configured with the same structure as in the sixth embodiment.

[0056] In the embodiments of this application, at least a portion of the connecting pipe 200 has an inner diameter that is less than or equal to the inner diameter of other portions of the connecting pipe 200. This configuration allows for the formation of a variable diameter structure on the connecting pipe 200, facilitating the adjustment of the flow area of ​​the connecting pipe 200. It also allows the connecting pipe 200 to adapt to the connection requirements of different air conditioning system pipelines, and facilitates the connection of the electronic expansion valve.

[0057] Specifically, at least a portion of the connecting pipe 200 contracts radially to form a capillary channel. The smaller inner diameter of the capillary channel generates greater flow resistance to the refrigerant fluid, thereby reducing the flow velocity of the refrigerant fluid in the connecting pipe, decreasing the frequency of bubble collapse in the refrigerant fluid, and further reducing the noise of the refrigerant fluid flowing through the electronic expansion valve, thus improving the user experience.

[0058] Specifically, the inner diameter of valve port 201 is D1, and the inner diameter of capillary channel is D2, where 1 ≤ D2 / D1 ≤ 2.5. When D2 / D1 > 2.5, the inner diameter of capillary channel is larger, reducing the flow resistance to the refrigerant and increasing the risk of air bubbles in the refrigerant bursting. Conversely, when D2 / D1 < 1, the inner diameter of capillary channel is smaller, resulting in greater flow resistance to the refrigerant, which is detrimental to smooth refrigerant flow and subsequent heat exchange. Specifically, the ratio of the inner diameter of capillary channel to that of valve port 201 can be set to 1.3, 1.5, 2.0, or 2.3, etc.

[0059] According to another aspect of this application, an air conditioning system is provided, including a heat exchanger, system piping, and an electronic expansion valve. The system piping connects the heat exchanger and the electronic expansion valve, and the connecting pipe 200 of the electronic expansion valve is directly connected to the system piping. Compared to conventional solutions where the connecting pipe 200 is connected to the system piping through other pipe fittings, this application, by directly connecting the connecting pipe 200 to the system piping, can reduce abrupt changes in flow area caused by pipe fittings, further reducing the noise of refrigerant flowing in the air conditioning system and ensuring a better user experience.

[0060] Specifically, when the connecting pipe 200 is made of stainless steel and the system pipeline is made of copper, a copper connecting sleeve can be provided at the end of the valve body 100 through the connecting pipe 200 to facilitate connection with the system pipeline.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0063] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes: The valve body (100) has a valve cavity (101); A connecting pipe (200) is fixedly connected to the valve body (100). The connecting pipe (200) communicates with the valve cavity (101). The port at one end of the connecting pipe (200) connected to the valve body (100) forms a valve port (201). The valve port (201) is used to cooperate with the valve needle (300) to adjust the flow rate at the valve port (201).

2. The electronic expansion valve according to claim 1, characterized in that, The valve body (100) is provided with a plug hole, and the connecting pipe (200) is plugged into the plug hole.

3. The electronic expansion valve according to claim 2, characterized in that, The valve body (100) includes a valve tube (110) and a valve seat core (120). The valve tube (110) has the valve cavity (101). The valve tube (110) is also provided with a mounting hole. The valve seat core (120) is inserted into the mounting hole and fixedly connected to the valve tube (110). The valve seat core (120) has the insertion hole.

4. The electronic expansion valve according to claim 2 or 3, characterized in that, A limiting structure is provided at the insertion hole, which is used to limit the displacement of the connecting pipe (200) towards the valve cavity (101).

5. The electronic expansion valve according to claim 4, characterized in that, The inner wall of a portion of the insertion hole protrudes inward in a direction perpendicular to the axis to form a protrusion. The protrusion has a stepped surface, which abuts against the end face of the connecting pipe (200). The stepped surface forms the limiting structure.

6. The electronic expansion valve according to claim 5, characterized in that, The insertion hole has a first hole section (111) and a second hole section (112) that are interconnected. The second hole section (112) is located at the end of the first hole section (111) away from the valve cavity (101), and the first hole section (111) forms the protrusion.

7. The electronic expansion valve according to claim 5, characterized in that, A guide sleeve (102) is provided at one end of the insertion hole near the valve cavity (101). The guide sleeve (102) guides and cooperates with the valve needle (300). The insertion hole has a first end and a second end that are arranged opposite to each other. The first end is located on the side of the second end near the valve cavity (101). A limiting boss (121) is provided at the port of the first end. The guide sleeve (102) is sleeved on the outside of the limiting boss (121).

8. The electronic expansion valve according to claim 7, characterized in that, The inner diameter of the limiting boss (121) gradually decreases along the direction from the first end to the second end. The inner diameter of the limiting boss (121) on the side near the second end is smaller than the inner diameter of the insertion hole. The end face of the limiting boss (121) on the side near the second end forms the stepped surface.

9. The electronic expansion valve according to claim 1, characterized in that, At least a portion of the connecting pipe (200) has an inner diameter that is less than or equal to the inner diameter of the other portions of the connecting pipe (200).

10. The electronic expansion valve according to claim 9, characterized in that, At least a portion of the connecting pipe (200) contracts radially to form a capillary channel, the inner diameter of the valve port (201) is D1, the inner diameter of the capillary channel is D2, and 1≤D2 / D1≤2.

5.

11. The electronic expansion valve according to claim 1, characterized in that, The connecting pipe (200) is integrally formed.

12. The electronic expansion valve according to claim 1, characterized in that, The connecting pipe (200) is welded to the valve body (100).

13. An air conditioning system, characterized in that, The air conditioning system includes system piping and an electronic expansion valve, wherein the electronic expansion valve is the electronic expansion valve according to any one of claims 1 to 12, and the connecting pipe (200) of the electronic expansion valve is connected to the system piping.

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