Electronic expansion valve and refrigeration equipment

Abstract

The electronic expansion valve comprises a valve body, a pipe A and a communicating pipe, the valve body is provided with a refrigerant cavity, a valve port, a first through hole and a first cavity, the refrigerant cavity is communicated with the first cavity through the valve port, the pipe A is installed on the valve body, and the communicating pipe is installed on the valve body. The valve body is provided with a first cavity, the pipe A is provided with a first through hole and communicated with the first cavity, the pipe A is provided with a second through hole, the communicating pipe is connected with the pipe A and / or the valve body, and the first through hole and the second through hole are communicated through the communicating pipe. According to the technical scheme, cavitation noise generated by the electronic expansion valve is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to an electronic expansion valve and refrigeration equipment. Background Art

[0002] The noise problem of electronic expansion valves has always been a highly concerned issue in air-conditioning systems. The noise generation mechanism of the expansion valve is complex and has many noise components. This application aims to adopt a method to reduce the cavitation noise inside the electronic expansion valve. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic expansion valve, aiming to reduce the cavitation noise generated by the electronic expansion valve.

[0004] To achieve the above object, the electronic expansion valve proposed in the present invention comprises:

[0005] A valve body, wherein the valve body is provided with a refrigerant cavity, a valve port, a first through hole and a first cavity, and the refrigerant cavity and the first cavity are connected through the valve port;

[0006] A tube, the A tube is installed on the valve body and communicated with the first cavity, and a second through hole is provided on the A tube; and

[0007] A connecting pipe, wherein the connecting pipe is connected to the A pipe and / or the valve body, and the first through hole and the second through hole are connected through the connecting pipe.

[0008] Optionally, the connecting tube is sleeved on the A tube and is sealedly connected to the A tube and the valve body. A second cavity is formed between the connecting tube and the A tube. The second cavity is connected to the A tube through the second through hole. The first cavity and the second cavity are connected through the first through hole.

[0009] Optionally, the diameter of the A tube is R1, the diameter of the connecting tube is R2, the maximum diameter of the valve body is R3, and R1<R2<R3.

[0010] Optionally, a welding groove is provided on the valve body, and the connecting pipe is welded to the welding groove.

[0011] Optionally, the connecting pipe includes a pipe wall and a bottom wall, the pipe wall is welded and fixed to the welding groove, the bottom wall is provided with a welding hole, and the A pipe is welded at the welding hole.

[0012] Optionally, one end of the connecting tube is sealed and connected to the first through hole, and the other end of the connecting tube is sealed and connected to the second through hole, so that the first through hole and the second through hole are connected.

[0013] Optionally, the second through hole is arranged away from the valve body.

[0014] Optionally, the length of the A tube is L, the distance between the second through hole and one end of the A tube close to the valve body is LP, and LP≥0.3L; or

[0015] The distance between the second through hole and one end of the A tube close to the valve body is LP, and LP is ≥ 20 mm.

[0016] Optionally, a plurality of the first through holes and / or the second through holes are provided.

[0017] Optionally, there are multiple connecting pipes.

[0018] Optionally, the electronic expansion valve further includes a B tube, a refrigerant port is provided on the valve body, the refrigerant port is communicated with the refrigerant cavity, and the B tube is welded and fixed at the refrigerant port.

[0019] Optionally, the valve body comprises:

[0020] a valve seat, on which the valve port, the refrigerant cavity, the first through hole and the first cavity are provided;

[0021] A nut, wherein the nut is fixedly mounted on the valve seat, the nut and the valve seat enclose a refrigerant cavity, the refrigerant cavity is connected to the refrigerant port and the valve port, and the valve seat is provided with a threaded hole along the axial direction of the valve seat;

[0022] A valve needle assembly, the valve needle assembly comprising a transmission section, a threaded section and a blocking section arranged in sequence, the threaded section being threadedly connected to the threaded hole; and

[0023] A magnetic rotor is installed on the valve seat and sleeved on the transmission section. The magnetic rotor drives the valve needle assembly to rotate so that the blocking section blocks or separates from the valve port.

[0024] The present invention also provides a refrigeration device, comprising the electronic expansion valve as described above.

[0025] The electronic expansion valve in the technical solution of the present invention includes a valve body, a tube A and a connecting pipe. The valve body is provided with a refrigerant chamber, a valve port, a first through hole and a first cavity. The refrigerant chamber and the first cavity are connected through the valve port. The tube A is installed on the valve body, and the tube A is connected with the first cavity. A second through hole is provided on the tube A. The connecting pipe is connected with the tube A and / or the valve body. The first through hole and the second through hole are connected through the connecting pipe, so that part of the high-pressure refrigerant at the second through hole of the tube A flows into the first through hole and the first cavity in turn through the connecting pipe, thereby suppressing the cavitation phenomenon in the first cavity, and further reducing the cavitation noise generated by the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0027] Figure 1 A cross-sectional view from one viewing angle of a first embodiment of an electronic expansion valve of the present invention;

[0028] Figure 2 It is a cross-sectional view from another perspective of the first embodiment of the electronic expansion valve of the present invention;

[0029] Figure 3 This is a cross-sectional view of the electronic expansion valve embodiment 2 of the present invention when a connecting pipe is installed;

[0030] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0031] Figure 5 This is a cross-sectional view of the electronic expansion valve embodiment 2 of the present invention when two connecting pipes are installed;

[0032] Figure 6 This is a schematic diagram of the structure of the electronic expansion valve embodiment 2 of the present invention when multiple connecting pipes are installed.

[0033] Description of Figure Numbers:

[0034] Label name Label name 11 Valve Seat 15 Connector 111 Refrigerant chamber 20 A-tube 113 Valve port 21 Second through hole 114 First through hole 30 Connecting pipe 115 First cavity 31 Second cavity 116 Welding slot 40 B tube 12 Nuts 41 First media segment 13 Valve needle assembly 42 Second media segment 14 Magnetic rotor

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Reference Figures 1 to 3 The present invention provides an electronic expansion valve, comprising:

[0041] A valve body, wherein the valve body is provided with a refrigerant cavity 111, a valve port 113, a first through hole 114 and a first cavity 115, and the refrigerant cavity 111 and the first cavity 115 are connected through the valve port 113;

[0042] A tube 20, the A tube 20 is installed on the valve body and communicates with the first cavity 115, and a second through hole 21 is provided on the A tube 20; and

[0043] A connecting pipe 30 is connected to the A pipe 20 and / or the valve body, and the first through hole 114 and the second through hole 21 are connected through the connecting pipe 30 .

[0044] The electronic expansion valve in the technical solution of the present invention includes a valve body, an A tube 20 and a connecting pipe 30. The valve body is provided with a refrigerant chamber 111, a valve port 113, a first through hole 114 and a first cavity 115. The refrigerant chamber 111 and the first cavity 115 are connected through the valve port 113. The A tube 20 is installed on the valve body, and the A tube 20 is connected with the first cavity 115. The A tube 20 is provided with a second through hole 21. The connecting pipe 30 is connected with the A tube 20 and the valve body. The first through hole 114 and the second through hole 21 are connected through the connecting pipe 30, so that part of the high-pressure refrigerant at the second through hole 21 of the A tube 20 flows into the first through hole 114 and the first cavity 115 in turn through the connecting pipe 30, thereby suppressing the cavitation phenomenon in the first cavity 115, and further reducing the cavitation noise generated by the electronic expansion valve.

[0045] It should be noted that, during cooling, tube A 20 serves as the medium outlet pipe, valve port 113 serves as the medium outlet, tube B 40 serves as the medium inlet pipe, and the refrigerant outlet serves as the medium inlet; during heating, tube A 20 serves as the medium inlet pipe, valve port 113 serves as the medium inlet, tube B 40 serves as the medium outlet pipe, and the refrigerant outlet serves as the medium outlet.

[0046] Reference Figure 1 and Figure 2 In the first embodiment, the connecting pipe 30 is sleeved on the A tube 20 and is sealed and connected to the A tube 20 and the valve body. A second cavity 31 is formed between the connecting pipe 30 and the A tube 20. The second cavity 31 is connected to the A tube 20 through the second through hole 21, and the first cavity 115 and the second cavity 31 are connected through the first through hole 114. As a result, part of the high-pressure refrigerant at the second through hole 21 of the A tube 20 flows into the first cavity 115 through the second cavity 31 and the first through hole 114 in sequence, thereby suppressing the cavitation phenomenon in the first cavity 115, and further reducing the cavitation noise generated by the electronic expansion valve.

[0047] In this embodiment, the diameter of the A tube 20 is R1, the diameter of the connecting tube 30 is R2, the maximum diameter of the valve body is R3, and R1<R2<R3. This facilitates the installation and sealing of the A tube 20 and the connecting tube 30.

[0048] Specifically, a welding groove 116 is provided on the valve body, and the connecting pipe 30 is welded to the welding groove 116. The welding groove 116 makes it easier to weld and fix the connecting pipe 30 on the valve body, and the welding groove 116 also facilitates accommodating solder.

[0049] Specifically, the connecting pipe 30 includes a pipe wall and a bottom wall, the pipe wall is welded and fixed to the welding groove 116, and a welding hole is provided on the bottom wall, and the A tube 20 is welded at the welding hole. By setting the welding hole, the installation and fixation of the A tube 20 are facilitated. It can be understood that the A tube 20 is first welded and fixed to the valve body, and then the connecting pipe 30 passes through the A tube 20 through the welding hole. After the connecting pipe 30 is welded and fixed to the valve body, the A tube 20 is welded and fixed to the welding hole; thereby facilitating the installation and fixation of the A tube 20 and the connecting pipe 30, and also facilitating the sealing of the connection between the connecting pipe 30 and the A tube 20.

[0050] Reference Figures 3 to 6 In the second embodiment, one end of the connecting tube 30 is sealed and connected to the first through hole 114, and the other end of the connecting tube 30 is sealed and connected to the second through hole 21, so that the first through hole 114 and the second through hole 21 are connected. As a result, part of the high-pressure refrigerant at the second through hole 21 flows into the first cavity 115 through the connecting tube 30 and the first through hole 114, thereby suppressing the cavitation phenomenon in the first cavity 115, and further reducing the cavitation noise generated by the electronic expansion valve; when there are multiple first through holes and second through holes, there are multiple corresponding connecting tubes.

[0051] The second through hole 21 is arranged away from the valve body. It can be understood that after the refrigerant is ejected from the valve port 113, the farther away from the valve port 113, the greater the pressure of the refrigerant. Therefore, the second through hole 21 is arranged at a position away from the valve body, so that the high-pressure refrigerant at the second through hole 21 flows into the first cavity 115 through the second cavity 31 and the first through hole 114 in turn, thereby suppressing the cavitation phenomenon in the first cavity 115, and reducing the cavitation noise generated by the electronic expansion valve.

[0052] Reference Figure 1 and Figure 3 In one embodiment, the length of the A tube 20 is L, and the distance between the second through hole 21 and the end of the A tube 20 close to the valve body is LP, LP≥0.3L; if LP<0.3L, it indicates that the second through hole 21 is too close to the valve body, so that the pressure of the refrigerant flowing into the second cavity 31 through the second through hole 21 is too low, thereby reducing the effect of suppressing the cavitation phenomenon in the first cavity 115; therefore, by setting LP≥0.3L, the pressure of the refrigerant flowing into the first cavity 115 through the second through hole 21 is increased, thereby further suppressing the cavitation phenomenon in the first cavity 115, and reducing the cavitation noise generated by the electronic expansion valve.

[0053] In another embodiment, the distance between the second through hole 21 and the end of the A tube 20 close to the valve body is LP, and LP≥20mm. If LP<20mm, it means that the second through hole 21 is too close to the valve body, so that the pressure of the refrigerant flowing into the second cavity 31 through the second through hole 21 is too low, thereby reducing the effect of suppressing the cavitation phenomenon in the first cavity 115; therefore, by setting LP≥20mm, the pressure of the refrigerant flowing into the first cavity 115 from the second through hole 21 is increased, thereby further suppressing the cavitation phenomenon in the first cavity 115, and thereby reducing the cavitation noise generated by the electronic expansion valve.

[0054] Furthermore, the first through hole 114 and / or the second through hole 21 are provided in plurality. By providing a plurality of first through holes 114 and second through holes 21, the refrigerant in the A tube 20 can flow into the second cavity 31 through a plurality of pathways, or the refrigerant in the second cavity 31 can flow into the first cavity 115 through a plurality of first through holes 114, thereby further suppressing the cavitation phenomenon in the first cavity 115 and further reducing the cavitation noise generated by the electronic expansion valve.

[0055] Furthermore, the connecting pipe 30 is provided in plurality. In the first embodiment, the connecting pipes 30 can be sequentially sleeved on the A pipe 20, and different connecting pipes 30 are correspondingly connected to different first through holes 114 and second through holes 21. Figure 6 In the second embodiment, a connecting pipe 30 is provided corresponding to a first through hole 114 and a second through hole 21 , and two ends of the connecting pipe 30 are respectively installed at the first through hole 114 and the second through hole 21 .

[0056] In this embodiment, the electronic expansion valve also includes a B tube 40, and a refrigerant port is provided on the valve body. The refrigerant port is connected to the refrigerant cavity 111, and the B tube 40 is welded and fixed at the refrigerant port; it can be understood that the refrigerant enters the refrigerant cavity 111 through the B tube 40, and then flows out through the valve port 113 and the A tube 20.

[0057] Further, the B tube 40 includes a first media segment 41 and a second media segment 42 connected to each other, the first media segment 41 is welded and fixed to the refrigerant port, and the diameter of the second media segment 42 is larger than the diameter of the first media segment 41. The first media segment 41 is used to adapt to the size setting of the refrigerant port, and further, the diameter of the second media segment 42 is smaller than the diameter of the first media segment 41, thereby increasing the pressure of the refrigerant entering the refrigerant cavity 111, while also reducing the generation of eddy currents, thereby reducing the generation of noise.

[0058] In this embodiment, the valve body includes a valve seat 11, a nut 12, a valve needle assembly 13 and a magnetic rotor 14; the valve seat 11 is provided with the valve port 113, the refrigerant cavity 111, the first through hole 114 and the first cavity 115; the nut 12 is fixedly installed on the valve seat 11, and the nut 12 and the valve seat 11 enclose a refrigerant cavity 111, and the refrigerant cavity 111 is connected with the refrigerant port and the valve port 113, and the valve seat 11 is provided with a threaded hole along the axial direction of the valve seat 11; the valve needle assembly 13 includes a transmission section, a threaded section and a blocking section arranged in sequence, and the threaded section is threadedly connected to the threaded hole; the magnetic rotor 14 is installed on the valve seat 11 and sleeved on the transmission section, and the magnetic rotor 14 drives the valve needle assembly 13 to rotate so that the blocking section blocks or disengages from the valve port 113.

[0059] In one embodiment, the valve seat 11 can be used to install and carry components such as the nut 12, the valve needle assembly 13 and the magnetic rotor 14, so that the various components of the electronic expansion valve can be assembled into a whole. Among them, the valve seat 11 can be a cylindrical structure with openings at both ends, one of which can be formed as a valve port 113, and the other opening is covered by the nut 12. The shape of the valve seat 11 can be a circular structure, so that its shape is more regular and easy to process and form. Of course, the present application is not limited to this. In other embodiments, the valve seat 11 can also be a square structure or other shape structures. The nut 12 can be used to enclose the refrigerant cavity 111 with the valve seat 11. At the same time, the threaded hole on the nut 12 can be coaxially arranged with the valve port 113 on the valve seat 11, so that the subsequent valve needle assembly 13 can accurately insert the valve port 113. Among them, the nut 12 can be completely arranged on the outside of the valve seat 11, and of course it can also be partially embedded in the opening formed at one end of the valve seat 11 away from the valve port 113. In this way, the contact area between the nut 12 and the valve seat 11 can be increased, thereby facilitating improvement of the stability and sealing of the connection between the two.

[0060] Furthermore, the nut 12 may be provided with a connecting piece 15, which may cover the connection between the nut 12 and the valve seat 11, so as to further improve the sealing performance of the connection between the nut 12 and the valve seat 11. The connecting piece 15 and the nut 12 may be embedded in the outer peripheral surface of the nut 12 to achieve the clamping fixation of the two, and the nut 12 may be fixed by welding to better improve the stability of the connection between the two. In addition, the shape of the nut 12 may also be a circular structure, so that its shape is more regular and easy to process and shape, and it can also make its volume relatively small and help to reduce the space occupied. The threaded hole on the nut 12 may be partially a threaded hole section, in which case the upper end, middle part or lower end of the threaded hole may be formed as a threaded hole section. Of course, the upper end, middle part or lower end of the threaded hole may also be formed as a threaded hole section. One end of the valve needle assembly 13 may be inserted into the threaded hole and threadedly connected to the threaded hole. The valve needle assembly 13 extending from the threaded hole into the refrigerant cavity 111 can be inserted into the valve port 113 to completely or partially close the valve port 113. When the valve port 113 is completely closed, the valve needle assembly 13 fits tightly with the valve port 113 so that the refrigerant cannot pass through. When the valve port 113 is partially closed, there is a gap between the valve needle assembly 13 and the valve port 113 so that a small amount of refrigerant can pass through. At the same time, it can also be detached from the valve port 113 to completely open the valve port 113. The magnetic rotor 14 can be used to provide power so that the valve needle assembly 13 can rotate relative to the nut 12.

[0061] Furthermore, the blocking section is tapered toward the valve port 113. The tapered setting facilitates the adjustment of the opening and closing size of the valve port 113, and the tapered blocking section can gradually extend into the valve port 113, thereby achieving the effect of adjusting the size of the valve port 113.

[0062] Specifically, a coil component may be provided on the outside of the magnetic rotor 14, and the magnetic rotor 14 may sense the electromagnetic force of the coil component and perform rotational motion. Since the valve needle assembly 13 is connected to the magnetic rotor 14, the valve needle assembly 13 rotates synchronously therewith, and the nut 12 section on the valve needle assembly 13 and the mounting hole on the nut 12 are threadedly matched to realize the lifting and lowering motion close to or away from the valve port 113, thereby realizing the insertion and separation of the valve port 113. Among them, the magnetic rotor 14 may be a cylindrical structure with one end open, so that its shape is adapted to the rotation trajectory and the possibility of interference during the movement can be reduced.

[0063] When the electronic expansion valve of the technical solution of the present invention is in use, the magnetic rotor 14 can sense the electromagnetic force of the coil component to perform rotational motion, and drive the valve needle assembly 13 to rotate relative to the nut 12. Since the valve needle assembly 13 and the nut 12 are threadedly matched, the valve needle assembly 13 can slide axially during the rotation process, that is, it can rise and fall in the mounting hole along the valve port 113 on the valve seat 11. The valve needle assembly 13 can be inserted into the valve port 113 or detached from the valve port 113, thereby realizing the control of closing and opening of the electronic expansion valve.

[0064] In one embodiment, the valve needle assembly 13 includes an integrally arranged valve needle, and the transmission section, the threaded section and the blocking section are all arranged on the valve needle, thereby simplifying the structure of the valve needle assembly, reducing the number of parts and components, and helping to reduce the manufacturing cost of the electronic expansion valve.

[0065] In another embodiment, the valve needle assembly 13 includes a valve needle and a screw rod. The valve needle is fixed on the screw rod. The magnetic rotor drives the screw rod to rotate, and the screw rod drives the valve needle to rotate. The transmission section and the threaded section are arranged on the screw rod, and the sealing section is arranged on the valve needle. By arranging the valve needle and the screw rod, the installation and subsequent maintenance of the valve needle assembly 13 are facilitated. If the valve needle assembly 13 needs to be replaced, only the corresponding parts need to be replaced, thereby reducing the subsequent maintenance cost.

[0066] The operating principle of the electronic expansion valve is as follows: the electronic expansion valve generates a magnetic field through the current of the coil and acts on the valve needle assembly 13, driving the valve needle assembly 13 to rotate. When the positive and negative power supply voltages and signals of the coil are changed, the electronic expansion valve also opens, closes, or changes the size of the opening and closing gaps, thereby achieving the flow rate of the refrigerant in the system and the size of the cooling and heat. The smaller the valve core is opened, the smaller the refrigerant flow rate is.

[0067] The role of the electronic expansion valve in the refrigerant system is throttling, that is, adjusting the flow of high-pressure liquid refrigerant entering the evaporator from the liquid pipeline and maintaining the pressure difference between the high-pressure side and the low-pressure side of the system to ensure that the refrigerant can evaporate at the desired low pressure in the evaporator, and at the same time, condense in the condenser under high pressure.

[0068] It only takes a few seconds for the electronic expansion valve to go from fully closed to fully open, with fast response and action speed, no static superheat phenomenon, and the opening and closing characteristics and speed can be set manually, which is especially suitable for the use of heat pump units with drastic operating conditions. This facilitates the rapid switching of the refrigerant flow, improves the working efficiency of the refrigeration equipment, and has stable performance, thereby extending the service life of the refrigeration equipment.

[0069] The present invention also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiment. Since the refrigeration device of the present application adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0070] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body, wherein the valve body is provided with a refrigerant cavity, a valve port, a first through hole and a first cavity, and the refrigerant cavity and the first cavity are connected through the valve port; A tube, the A tube is installed on the valve body and communicated with the first cavity, and a second through hole is provided on the A tube; and A connecting pipe, wherein the connecting pipe is connected to the A pipe and / or the valve body, and the first through hole and the second through hole are connected through the connecting pipe.

2. The electronic expansion valve according to claim 1, characterized in that: The connecting tube is sleeved on the A tube and is sealedly connected to the A tube and the valve body. A second cavity is formed between the connecting tube and the A tube. The second cavity is connected to the A tube through the second through hole. The first cavity and the second cavity are connected through the first through hole.

3. The electronic expansion valve according to claim 2, characterized in that: The diameter of the A tube is R1, the diameter of the connecting tube is R2, the maximum diameter of the valve body is R3, and R1<R2<R3.

4. The electronic expansion valve according to claim 2, characterized in that: The valve body is provided with a welding groove, and the connecting pipe is welded to the welding groove.

5. The electronic expansion valve according to claim 4, characterized in that: The connecting pipe comprises a pipe wall and a bottom wall. The pipe wall is welded and fixed to the welding groove. A welding hole is arranged on the bottom wall. The A pipe is welded to the welding hole.

6. The electronic expansion valve according to claim 1, characterized in that: One end of the connecting tube is sealed and connected to the first through hole, and the other end of the connecting tube is sealed and connected to the second through hole, so that the first through hole and the second through hole are connected.

7. The electronic expansion valve according to claim 1, characterized in that: The second through hole is arranged away from the valve body.

8. The electronic expansion valve according to claim 1, characterized in that: The length of the A tube is L, the distance between the second through hole and the end of the A tube close to the valve body is LP, and LP≥0.3L; or The distance between the second through hole and one end of the A tube close to the valve body is LP, and LP is ≥ 20 mm.

9. The electronic expansion valve according to claim 1, characterized in that: A plurality of the first through holes and / or the second through holes are provided.

10. The electronic expansion valve according to claim 1, characterized in that: There are multiple communicating pipes.

11. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a B tube. A refrigerant port is provided on the valve body. The refrigerant port is communicated with the refrigerant cavity. The B tube is welded and fixed at the refrigerant port.

12. The electronic expansion valve according to claim 1, characterized in that: The valve body comprises: a valve seat, on which the valve port, the refrigerant cavity, the first through hole and the first cavity are provided; A nut, wherein the nut is fixedly mounted on the valve seat, the nut and the valve seat enclose a refrigerant cavity, the refrigerant cavity is connected to the refrigerant port and the valve port, and the valve seat is provided with a threaded hole along the axial direction of the valve seat; A valve needle assembly, the valve needle assembly comprising a transmission section, a threaded section and a blocking section arranged in sequence, the threaded section being threadedly connected to the threaded hole; and A magnetic rotor is installed on the valve seat and sleeved on the transmission section. The magnetic rotor drives the valve needle assembly to rotate so that the blocking section blocks or separates from the valve port.

13. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 12.

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