Electronic expansion valve

Abstract

The present invention provides an electronic expansion valve, which includes: a housing having an accommodation chamber and a valve chamber, the accommodation chamber and the valve chamber being spaced apart, the valve chamber being used for communicating with a pipeline, the housing including a valve seat, and the valve chamber being arranged within the valve seat; a valve core assembly movably arranged within the housing, the valve core assembly having an open position and a blocking position, when the valve core assembly is located at the open position, the valve chamber is in a conducting state, and when the valve core assembly is located at the blocking position, the valve chamber is in a cut-off state; a guiding seat arranged within the housing, the guiding seat being located between the accommodation chamber and the valve chamber, a part of the valve core assembly being inserted through the guiding seat, and there being a balance passage between the guiding seat and the valve seat, one end of the balance passage being communicated with the accommodation chamber, and the other end of the balance passage being communicated with the valve chamber. By the technical solution provided by the present application, the problem of difficult rapid pressure balance in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic expansion valves, and more particularly, to an electronic expansion valve. Background Art

[0002] Currently, an electronic expansion valve includes a housing and a valve core assembly, and the valve core assembly is disposed within the valve body. Among them, the housing includes a receiving cavity and a valve cavity, and the valve cavity is used to communicate with a pipeline. The valve core assembly moves within the housing to adjust the communication between the valve cavity and the pipeline, thereby achieving the opening and closing of the electronic expansion valve.

[0003] However, in the prior art, the receiving cavity is not in communication with the valve cavity. When the electronic expansion valve is opened or closed using the valve core assembly, there is a pressure difference between the receiving cavity and the valve cavity, which will affect the operating performance of the valve core assembly. Therefore, there is a problem in the prior art that it is difficult to achieve rapid pressure balance. Summary of the Invention

[0004] The present invention provides an electronic expansion valve to solve the problem of difficult rapid pressure balance in the prior art.

[0005] The present invention provides an electronic expansion valve, which includes: a housing having a receiving cavity and a valve cavity, the receiving cavity and the valve cavity are spaced apart, the valve cavity is used to communicate with a pipeline, the housing includes a valve seat, and the valve cavity is disposed within the valve seat; a valve core assembly movably disposed within the housing, the valve core assembly having an open position and a blocking position, when the valve core assembly is in the open position, the valve cavity is in a conducting state, and when the valve core assembly is in the blocking position, the valve cavity is in a blocking state; a guide seat disposed within the housing, the guide seat is located between the receiving cavity and the valve cavity, a part of the valve core assembly passes through the guide seat, and there is a balance channel between the guide seat and the valve seat, one end of the balance channel communicates with the receiving cavity, and the other end of the balance channel communicates with the valve cavity.

[0006] Further, the housing further includes a sleeve, the valve seat is connected to the sleeve, one end of the valve seat close to the sleeve has a mounting hole, the mounting hole communicates with the inside of the sleeve to form the receiving cavity, the valve cavity is disposed at the other end of the valve seat, and one end of the guide seat is fixedly connected to the valve seat through the mounting hole.

[0007] Further, the valve core assembly includes a nut seat and a screw rod passing through the nut seat, the other end of the guide seat is connected to the nut seat, and the outer wall of the guide seat is in transitional fit or interference fit with the inner hole of the nut seat, so as to achieve the alignment of the nut seat, improve the coaxiality between the nut seat, the screw rod and the valve seat.

[0008] Further, the mounting hole is a stepped hole, the mounting hole includes a first hole and a second hole arranged in sequence and with diameters decreasing in sequence, and the second hole communicates with the valve cavity.

[0009] Further, a limiting boss is provided on the outer wall of the guiding seat. The limiting boss is in interference fit with the first hole, and the limiting boss is used to limit the relative position between the guiding seat and the valve seat. The guiding seat is arranged in the first hole and the second hole.

[0010] Further, the balance channel includes a notch, and the notch is arranged on the side wall of the limiting boss. The accommodating cavity is communicated with the valve cavity through the notch.

[0011] Further, the limiting boss includes a first boss and a second boss which are arranged in a stepped manner. The first boss corresponds to the first hole, the second boss corresponds to the second hole, and the notch penetrates through the first boss and the second boss.

[0012] Further, a plurality of notches are arranged on the side wall of the guiding seat, and the plurality of notches are arranged at intervals along the circumferential direction of the limiting boss.

[0013] Further, the guiding seat and / or the valve seat has a communication hole. One end of the communication hole is communicated with the accommodating cavity, and the other end of the communication hole is communicated with the valve cavity. The communication hole forms a balance channel.

[0014] Further, the communication hole is arranged on the limiting boss. One end of the communication hole is communicated with the accommodating cavity, and the other end of the communication hole is communicated with the second hole.

[0015] Further, the guiding seat has a plurality of communication holes, and the plurality of communication holes are arranged at intervals along the circumferential direction of the guiding seat on the limiting boss.

[0016] Applying the technical solution of the present invention, the electronic expansion valve includes a housing, a valve core assembly and a guiding seat. Among them, the housing has an accommodating cavity and a valve cavity, and the valve cavity is used to communicate with a pipeline. By moving the valve core assembly between an open position and a blocking position, the valve cavity can be switched between a conducting state and a blocking state. Specifically, the guiding seat is arranged between the accommodating cavity and the valve cavity. By arranging a balance channel between the guiding seat and the housing, one end of the balance channel is communicated with the accommodating cavity, and the other end of the balance channel is communicated with the valve cavity, so that the communication between the accommodating cavity and the valve cavity can be realized. When the electronic expansion valve is opened or closed, the accommodating cavity and the valve cavity can achieve rapid pressure balance through the balance channel, and thus the action performance of the valve core assembly in the expansion valve will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of an electronic expansion valve provided in Embodiment 1 of the present invention;

[0019] Figure 2 showsFigure 1 Partial enlarged view at location A in

[0020] Figure 3 shows Figure 1 Schematic structural view of the guide seat in

[0021] Figure 4 shows Figure 1 Another schematic structural view of the guide seat in

[0022] Figure 5 Schematic structural view of the electronic expansion valve provided in Embodiment II of the present invention;

[0023] Figure 6 shows Figure 5 Partial enlarged view at location B in

[0024] Figure 7 shows Figure 5 Schematic structural view of the guide seat in

[0025] Figure 8 Another schematic structural view of the electronic expansion valve provided in Embodiment II of the present invention;

[0026] Figure 9 shows Figure 8 Partial enlarged view at location C in

[0027] Figure 10 shows Figure 8 Schematic structural view of the guide seat in

[0028] Among them, the above-mentioned drawings include the following reference numerals:

[0029] 10. Housing; 11. Accommodating cavity; 12. Valve cavity; 13. Sleeve; 14. Valve seat; 141. First hole; 142. Second hole;

[0030] 20. Spool assembly; 21. Rotor; 22. Nut seat; 23. Screw; 24. Valve needle assembly;

[0031] 30. Guide seat; 31. Limiting boss; 311. First boss; 312. Second boss;

[0032] 40. Balance channel; 41. Notch; 42. Communication hole. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] As Figures 1 to 4 shown, according to Embodiment 1 of the present invention, an electronic expansion valve is provided. The electronic expansion valve includes a housing 10, a valve core assembly 20, and a guide seat 30. Among them, the housing 10 has a receiving cavity 11 and a valve cavity 12, and the receiving cavity 11 and the valve cavity 12 are arranged at intervals. The valve cavity 12 is used to communicate with a pipeline. The housing 10 includes a valve seat 14, and the valve cavity 12 is arranged in the valve seat 14. Among them, the valve core assembly 20 is movably arranged in the housing 10. The valve core assembly 20 has an open position and a blocking position. When the valve core assembly 20 is in the open position, the valve cavity 12 is in a conducting state. When the valve core assembly 20 is in the blocking position, the valve cavity 12 is in a cut-off state. In this embodiment, the valve cavity 12 is connected to two pipelines. When the valve core assembly 20 is in the open position, the two pipelines can be connected through the valve cavity 12. When the valve core assembly is in the blocking position, the two pipelines are blocked by the valve cavity 12. Specifically, the guide seat 30 is arranged in the housing 10, and the guide seat 30 is located between the receiving cavity 11 and the valve cavity 12. Among them, a balance channel 40 is arranged between the guide seat 30 and the valve seat 14. One end of the balance channel 40 is communicated with the receiving cavity 11, and the other end of the balance channel 40 is communicated with the valve cavity 12, so that the communication between the receiving cavity 11 and the valve cavity 12 can be realized.

[0035] Applying the electronic expansion valve provided in this embodiment, by arranging the balance channel 40 between the receiving cavity 11 and the valve cavity 12, the communication between the receiving cavity 11 and the valve cavity 12 can be realized. When the valve core assembly 20 is moved in the housing 10 to switch the valve cavity 12 between the conducting state and the cut-off state, the receiving cavity 11 and the valve cavity 12 can achieve rapid pressure balance through the balance channel 40, so as not to cause damage to the valve core assembly 20, avoid affecting the action performance of the valve core assembly, and further improve the service life and reliability of the expansion valve.

[0036] In this embodiment, the housing 10 further includes a sleeve 13. Part of the valve seat 14 is located inside the sleeve 13, and the valve seat 14 is fixedly connected to the sleeve 13. Wherein, one end of the valve seat 14 close to the sleeve 13 has a mounting hole, and the guide seat 30 is fixedly connected to the valve seat 14 through the mounting hole. Moreover, the mounting hole communicates with the sleeve 13 to form an accommodation cavity 11, and the valve cavity 12 is arranged at the other end of the valve seat 14. The valve cavity 12 is used for communicating with a pipeline, and a valve port is arranged in the valve cavity 12, and the valve port is arranged at the pipe orifice of one of the pipelines.

[0037] Specifically, the mounting hole is a stepped hole. In this embodiment, the mounting hole includes a first hole 141 and a second hole 142 which are arranged in sequence and have gradually decreasing diameters, and the second hole 142 communicates with the valve cavity 12.

[0038] Wherein, a limiting boss 31 is arranged on the outer wall of the guide seat 30. In this embodiment, the limiting boss 31 is in interference fit with the first hole 141 to realize the fixed connection between the guide seat 30 and the valve seat 14, and further, the relative position between the guide seat 30 and the valve seat 14 can be limited by the limiting boss 31. Specifically, the guide seat 30 is inserted into the first hole 141 and the second hole 142. In this embodiment, the limiting boss 31 is in interference fit with at least one of the first hole 141 and the second hole 142.

[0039] As Figure 3 and Figure 4 shown, the balance channel 40 includes a notch 41, and the notch 41 is arranged on the side wall of the limiting boss 31. Specifically, one end of the notch 41 communicates with the accommodation cavity 11, and the other end of the notch 41 communicates with the valve cavity 12, so that the accommodation cavity 11 can communicate with the valve cavity 12 through the notch 41. In this embodiment, the notch 41 is a cut surface, the cut surface penetrates through the limiting boss 31, and there is a gap between the cut surface and the mounting hole to form the balance channel. Specifically, the extending direction of the cut surface is the same as the axial direction of the guide seat 30, that is, the balance channel 40 preferably extends in the vertical direction to better balance the pressure between the accommodation cavity 11 and the valve cavity 12.

[0040] Specifically, the limiting boss 31 includes a first boss 311 and a second boss 312 which are arranged in a stepped manner. The first boss 311 corresponds to the first hole 141, and the second boss 312 corresponds to the second hole 142. Wherein, the first boss 311 is in interference fit with the first hole 141, and the second boss 312 is in interference fit, transition fit or clearance fit with the second hole 142. Moreover, the notch 41 penetrates through the first boss 311 and the second boss 312, so that there is a gap between the limiting boss 31 and the mounting hole, thereby forming the balance channel.

[0041] In this embodiment, a plurality of notches 41 are provided on the side wall of the guide seat 30, and the plurality of notches 41 are arranged at intervals along the circumferential direction of the limiting boss 31. Specifically, two cut surfaces are provided on the side wall of the guide seat 30, and the two cut surfaces penetrate through the first boss 311 and the second boss 312, and the two cut surfaces are symmetrically arranged at intervals along the circumferential direction of the limiting boss 31. In other embodiments, the number of the notches 41 can be changed according to the usage situation, and the number of the notches 41 can be three, four, five, etc.

[0042] As Figures 5 to 10 shown, according to Embodiment 2 of the present invention, an electronic expansion valve is provided. The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the guide seat 30 and / or the valve seat 14 has a communication hole 42. One end of the communication hole 42 communicates with the accommodation cavity 11, and the other end of the communication hole 42 communicates with the valve cavity 12, and the communication hole 42 forms a balance channel 40. In this embodiment, the communication hole 42 is provided on the guide seat 30. In other embodiments, the communication hole 42 can be provided on the valve seat 14. Specifically, by providing a cut groove on the inner wall of the valve seat, the balance channel can be formed by using the cut groove.

[0043] As Figure 7 shown, the communication hole 42 is provided on the limiting boss 31. One end of the communication hole 42 communicates with the accommodation cavity 11, and the other end of the communication hole 42 communicates with the second hole 142, so that the communication hole 42 can communicate with the valve cavity 12 through the notch 41. In this embodiment, the outer diameter of the second boss 312 is smaller than the aperture of the second hole 142, so that there is a gap between the second boss 312 and the second hole 142. Specifically, one end of the communication hole 42 communicates with the accommodation cavity 11, and the other end of the communication hole 42 communicates with the valve cavity 12 through the gap between the second boss 312 and the second hole 142.

[0044] As Figure 10 shown, the communication hole 42 is provided on the inner wall of the valve seat 14, and the communication hole 42 penetrates through the mounting hole, so that one end of the communication hole 42 communicates with the accommodation cavity 11, and the other end of the communication hole 42 communicates with the second hole 142, so that the communication hole 42 can communicate with the valve cavity 12 through the notch 41.

[0045] In this embodiment, the guide seat 30 has a plurality of communication holes 42, and the plurality of communication holes 42 are arranged at intervals along the circumferential direction of the guide seat 30 on the limiting boss 31. Specifically, the guide seat 30 has two communication holes 42, and the two communication holes 42 are symmetrically arranged at intervals along the circumferential direction of the guide seat 30. In other embodiments, the number of the communication holes 42 can be changed according to the usage situation, and the number of the communication holes 42 can be three, four, five, etc.

[0046] Specifically, the nominal diameter of the unilateral balance channel is 0.5 - 3 mm. When using the method provided in the first embodiment of setting notches 41 on the side wall of the guide seat 30 to form the balance channel, by measuring the area of a single-sided notch and converting this notch into a round hole with the same area, the diameter of this round hole is the nominal diameter of the unilateral balance channel. When using the method provided in the second embodiment of setting communication holes 42 on the guide seat 30 and / or the valve seat 14 to form the balance channel, the diameter of a single-sided communication hole 42 is the nominal diameter of the unilateral balance channel.

[0047] In this embodiment, the spool assembly 20 includes a rotor 21, a nut seat 22, a screw 23, and a valve needle assembly 24. Among them, the rotor 21 is rotatably arranged in the accommodation cavity, and the nut seat 22 is fixedly arranged in the accommodation cavity. Specifically, the rotor 21 is drivingly connected to one end of the screw 23, the valve needle assembly 24 is connected to the other end of the screw 23, the screw 23 is inserted into the nut seat 22, and the screw 23 and the nut seat 22 are in threaded cooperation. When opening or closing the electronic expansion valve, the rotor 21 is rotated in the accommodation cavity, and the rotor 21 will drive the screw 23 to rotate relative to the nut seat 22, so that the screw 23 adjusts the relative position between the valve needle assembly 24 and the valve port, thereby realizing the opening or closing of the electronic expansion valve.

[0048] Among them, one end of the guide seat 30 is connected to the valve seat 14, the other end of the guide seat 30 is connected to the nut seat 22, and the outer circle of the guide seat 30 and the inner hole of the nut seat 22 are in transitional fit or interference fit, so as to realize the alignment of the nut seat 22 and improve the coaxiality between the nut seat 22 and the valve seat 14. Specifically, the guide seat 30 has a connecting section and a limiting section arranged oppositely, and a limiting boss 31 is arranged on the limiting section. Among them, the connecting section is inserted into the nut seat 22 by means of interference fit to realize the fixed connection between the guide seat 30 and the nut seat 22. Specifically, the guide seat 30 has a guide hole, the guide hole is arranged in the connecting section, and the extending direction of the guide hole is the same as the axis direction of the guide seat 30, and the valve needle assembly 24 is movably arranged in the guide hole. With the above structure, by arranging the guide seat 30 between the nut seat 22 and the valve seat 14, the guide seat 30 can be used to guide the valve needle assembly 24, so as to ensure the coaxiality among the nut seat 22, the valve needle assembly 24, and the valve seat 14.

[0049] Among them, the valve needle assembly 24 includes a valve needle and a preloading spring. Among them, the first end of the valve needle faces the valve port, the second end of the valve needle is connected to the screw 23, and the preloading spring is arranged between the valve needle and the screw 23, and the preloading spring is used to provide a preloading force to the valve needle. And when the valve needle abuts against the valve port, the preloading spring can reduce the impact force between the valve needle and the valve port. When flowing in the reverse direction, it can be opened under a certain pressure difference, and thus the valve needle, the valve port, and the system can be protected.

[0050] By providing a notch 41 on the side wall of the guide seat 30, or providing a communication hole 42 in the guide seat 30 and / or the valve seat 14, a balance channel 40 can be formed between the accommodation cavity 11 and the valve cavity 12. When opening or closing the electronic expansion valve, the accommodation cavity 11 and the valve cavity 12 can achieve rapid pressure balance through the balance channel 40, thus not causing damage to the components within the housing 10, and further improving the service life of the expansion valve.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0054] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0055] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes: A housing (10), the housing (10) having a receiving cavity (11) and a valve cavity (12), the receiving cavity (11) and the valve cavity (12) being spaced apart, the valve cavity (12) being for communicating with a pipeline, the housing (10) including a valve seat (14), the valve cavity (12) being provided within the valve seat (14); A valve core assembly (20), movably provided within the housing (10), the valve core assembly (20) including a valve needle assembly (24), the valve core assembly (20) having an open position and a blocking position, when the valve core assembly (20) is in the open position, the valve cavity (12) is in a conducting state, and when the valve core assembly (20) is in the blocking position, the valve cavity (12) is in a blocked state; A guide seat (30), provided within the housing (10), the guide seat being located between the receiving cavity (11) and the valve cavity (12), a part of the valve core assembly (20) being disposed within the guide seat (30), a balance passage (40) being provided between the guide seat (30) and the valve seat (14), one end of the balance passage (40) communicating with the receiving cavity (11), and the other end of the balance passage (40) communicating with the valve cavity (12); The guide seat (30) has a guide hole, and the extending direction of the guide hole is the same as the axial direction of the guide seat (30), the valve needle assembly (24) being movably disposed within the guide hole, the balance passage (40) being isolated from the guide hole through the side wall of the guide seat (30); A limiting boss (31) is provided on the outer wall of the guide seat (30), the balance passage (40) includes a notch (41), the notch (41) being provided on the side wall of the limiting boss (31), the receiving cavity (11) communicating with the valve cavity (12) through the notch (41), the limiting boss (31) including a first boss (311) and a second boss (312) which are stepped, and the notch (41) penetrating through the first boss (311) and the second boss (312).

2. The electronic expansion valve according to claim 1, wherein, The housing (10) further includes a sleeve (13), the valve seat (14) being connected to the sleeve (13), one end of the valve seat (14) close to the sleeve (13) having a mounting hole, the mounting hole communicating with the sleeve (13) to form the receiving cavity (11), the valve cavity (12) being provided at the other end of the valve seat (14), and the guide seat (30) being fixedly connected to the valve seat (14) through the mounting hole.

3. The electronic expansion valve according to claim 2, wherein, The mounting hole is a stepped hole, the mounting hole including a first hole (141) and a second hole (142) which are sequentially arranged and have sequentially decreasing diameters, the second hole (142) communicating with the valve cavity (12).

4. The electronic expansion valve according to claim 3, characterized in that, The limiting boss (31) is in interference fit with the first hole (141). The limiting boss (31) is used to limit the relative position between the guide seat (30) and the valve seat (14). The guide seat (30) is arranged in the first hole (141) and the second hole (142).

5. The electronic expansion valve according to claim 4, characterized in that, The first boss (311) is arranged corresponding to the first hole (141), and the second boss (312) is arranged corresponding to the second hole (142).

6. The electronic expansion valve according to claim 4, characterized in that A plurality of the notches (41) are arranged on the side wall of the guide seat (30). The plurality of the notches (41) are arranged at intervals along the circumferential direction of the limiting boss (31).

7. The electronic expansion valve according to claim 4, wherein, The guide seat (30) and / or the valve seat (14) has a communication hole (42). One end of the communication hole (42) is communicated with the accommodating cavity (11), and the other end of the communication hole (42) is communicated with the valve cavity (12). The communication hole (42) forms the balance channel (40).

8. The electronic expansion valve according to claim 7, wherein, The communication hole (42) is arranged on the limiting boss (31). One end of the communication hole (42) is communicated with the accommodating cavity (11), and the other end of the communication hole (42) is communicated with the second hole (142).

9. The electronic expansion valve according to claim 8, characterized in that, The guide seat (30) has a plurality of the communication holes (42). The plurality of the communication holes (42) are arranged at intervals along the circumferential direction of the guide seat (30) on the limiting boss (31).

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