A two-way noise-reducing throttling electronic expansion valve

Abstract

The utility model discloses a kind of two-way noise reduction throttling electronic expansion valves, including valve body, the valve body lower end front side and bottom are respectively fixed with inlet and outlet and are communicated, the inlet and outlet outer end are respectively fixed with noise reduction pipe and are communicated, the noise reduction pipe is respectively composed of main flow channel and auxiliary flow channel, balance cavity is fixedly installed in the inner wall of auxiliary flow channel, flow-through micropore is passed through and is set in the middle part of balance cavity, the inlet and outlet outer end opening are fixedly installed with connecting port, locating ring is fixedly installed on the outer side of connecting port, metal filter screen is movably connected with the inner wall of locating ring and is pasted.The utility model part refrigerant will be shunted by auxiliary flow channel, form buffer layer, reduce main flow channel fluid impact intensity, auxiliary flow channel guides fluid uniform diffusion, reduce vortex and pressure mutation, when main flow channel and auxiliary flow channel connection place is evenly gradually reduced and is distributed, the pressure gradient caused by flow channel mutation will be avoided and is sharply increased, inhibit cavitation bubble generation, to reduce the noise of refrigerant circulation.

Description

Technical Field

[0001] This utility model relates to the technical field of throttling devices for refrigeration systems, specifically a bidirectional noise-reducing throttling electronic expansion valve. Background Technology

[0002] An electronic expansion valve is a throttling element that allows refrigerant flow into a refrigeration unit according to a preset program; it is an automatic actuator. It uses an electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby regulating the refrigerant supply. It is one of the key components in the intelligent control of refrigeration systems.

[0003] Among them, the electronic expansion valve, as the core throttling element of the refrigeration system, controls the superheat of the evaporator by adjusting the refrigerant flow, which directly affects the system's energy efficiency and stability.

[0004] However, in actual use, when the traditional electronic expansion valve is in operation, the sudden change in the flow path when the refrigerant flows through the valve port causes a sudden drop in pressure, which triggers the generation and collapse of cavitation bubbles, generating high-frequency noise; the fluid impact on the valve body and pipeline causes resonance, which aggravates noise pollution. Utility Model Content

[0005] The purpose of this invention is to provide a bidirectional noise-reducing throttling electronic expansion valve to solve the problem mentioned in the background art: when the refrigerant flows through the valve port in both phases, the sudden change in the flow path causes a sudden drop in pressure, which triggers the generation and collapse of cavitation bubbles, generating high-frequency noise; the fluid impact on the valve body and pipeline causes resonance, exacerbating the noise pollution problem.

[0006] To achieve the above objectives, the present invention provides the following technical solution: including a valve body, wherein an inlet and an outlet are fixedly connected to the lower front side and bottom of the valve body, respectively; The inlet and outlet are respectively fixedly connected to noise reduction tubes. The noise reduction tubes are respectively composed of a main flow channel and a secondary flow channel. A balance cavity is fixedly installed on the inner wall of the secondary flow channel. A flow microhole is opened through the middle of the balance cavity. A connection port is fixedly installed on the outer opening of the inlet and outlet. A positioning ring is fixedly installed on the outer side of the connection port. A metal filter screen is movably connected to the inner wall of the positioning ring.

[0007] Preferably, a stepper motor is fixedly installed on the upper end of the valve body, and a transmission screw is fixedly installed on the rotor part of the lower end of the stepper motor. The outer curved surface of the transmission screw is threadedly connected to an internal thread transmission slider, and the outer end of the internal thread transmission slider is movably connected to a limit groove.

[0008] Preferably, the limiting square groove is fixedly installed through the middle of the upper end of the valve body, the bottom of the internal thread transmission slider is fixedly installed with a valve stem, the bottom of the valve stem is fixedly installed with a valve needle, and the middle part of the lower end of the valve body is fixedly installed with a valve seat, and the inner wall of the middle part of the valve seat matches the outer end of the valve needle.

[0009] Preferably, the diameter of the main flow channel is larger than the diameter of the secondary flow channel, and the connection between the main flow channel and the secondary flow channel is uniformly tapered.

[0010] Preferably, there are several flow micropores, which are symmetrically distributed in sequence with respect to the balance cavity, and the openings of the flow micropores are arc-shaped.

[0011] Preferably, a connecting flange is fixedly installed at the outer end of the connection port.

[0012] Preferably, the inner wall of the positioning ring is provided with a positioning groove, and the outer end of the metal filter screen is provided with a positioning boss, and the positioning boss is movably connected to the inner wall of the positioning groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are: When the refrigerant flows into the main channel, some of it is diverted through the secondary channel to form a buffer layer, reducing the impact intensity of the fluid in the main channel. When it flows out, the secondary channel guides the fluid to diffuse evenly, reducing eddies and pressure changes. When the connection between the main channel and the secondary channel is evenly and gradually narrowing, it avoids the pressure gradient surge caused by the sudden change in the channel, suppresses the generation of cavitation bubbles, and thus reduces the noise of refrigerant flow. This invention also disperses the energy of the refrigerant fluid through the filter holes of the metal filter itself, reduces the local flow velocity, and decreases the probability of cavitation nuclei formation. At the same time, when the refrigerant enters the secondary flow channel, the pressure fluctuations inside the secondary flow channel are further reduced and transmitted outward, thereby further reducing the noise of refrigerant flow and meeting the low-noise operation requirements of high-end air conditioning and heat pump systems. The micro-perforations opened through the middle of the balancing cavity balance the pressure before and after. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a bidirectional noise reduction throttling electronic expansion valve according to this utility model; Figure 2 This is a cross-sectional schematic diagram of the overall structure of a bidirectional noise reduction throttling electronic expansion valve according to this utility model; Figure 3 This is a partial cross-sectional view of the structure of a bidirectional noise-reducing throttling electronic expansion valve according to this utility model.

[0015] In the diagram: 1. Valve body; 2. Stepper motor; 3. Drive screw; 4. Internal thread drive slider; 5. Limiting square groove; 6. Valve stem; 7. Valve needle; 8. Valve seat; 9. Inlet; 10. Outlet; 11. Noise reduction tube; 12. Main flow channel; 13. Secondary flow channel; 14. Balance chamber; 15. Flow micropores; 16. Connection port; 17. Connection flange; 18. Positioning ring; 19. Metal filter screen. Detailed Implementation

[0016] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 This utility model provides a bidirectional noise reduction and throttling electronic expansion valve technical solution: including a valve body 1, a stepper motor 2 fixedly installed at the upper end of the valve body 1, a transmission screw 3 fixedly installed at the rotor part of the lower end of the stepper motor 2, an internal thread transmission slider 4 connected to the outer curved surface of the transmission screw 3, a limiting square groove 5 movably connected to the outer end of the internal thread transmission slider 4, and the limiting square groove 5 is fixedly installed through the middle of the upper end of the valve body 1, so that the internal thread transmission slider 4 can be vertically limited by the limiting square groove 5, a valve stem 6 fixedly installed at the bottom of the internal thread transmission slider 4, a valve needle 7 fixedly installed at the bottom of the valve stem 6, a valve seat 8 fixedly installed at the middle part of the lower end of the valve body 1, and the inner wall of the middle part of the valve seat 8 matches the outer end of the valve needle 7, so that the lower end of the valve body 1 can be opened and closed by the valve needle 7 cooperating with the valve seat 8, and an inlet 9 and an outlet 10 are fixedly connected to the front side and bottom of the lower end of the valve body 1, respectively; Noise reduction pipes 11 are fixedly connected to the outer ends of inlet 9 and outlet 10, respectively. Each noise reduction pipe 11 consists of a main flow channel 12 and a secondary flow channel 13. The diameter of the main flow channel 12 is larger than the diameter of the secondary flow channel 13. The connection between the main flow channel 12 and the secondary flow channel 13 is uniformly tapered. A balancing cavity 14 is fixedly installed on the inner wall of the secondary flow channel 13. A flow micro-hole 15 is opened through the center of the balancing cavity 14, and there are several flow micro-holes 15, symmetrically distributed around the balancing cavity 14. The openings of the flow micro-holes 15 are arc-shaped. A connection port 16 is fixedly installed at the end opening, and a connecting flange 17 is fixedly installed at the outer end of the connection port 16, so that the connection port 16 and the connecting flange 17 can be connected to the refrigerant pipeline. A positioning ring 18 is fixedly installed on the outer side of the connection port 16, and a metal filter screen 19 is movably connected to the inner wall of the positioning ring 18. A positioning groove is opened on the inner wall of the positioning ring 18, and a positioning boss is opened at the outer end of the metal filter screen 19. The positioning boss is movably connected to the inner wall of the positioning groove, so that the metal filter screen 19 is limited and positioned by the positioning boss and the positioning groove.

[0018] Working principle: In use, this utility model connects the inlet 9 and outlet 10 to the refrigerant pipeline through the connection port 16 and the connection flange 17. When the inlet 9 and outlet 10 are connected to the refrigerant pipeline, the stepper motor 2 is turned on by control. When the stepper motor 2 is turned on, it will drive the transmission screw 3 to rotate. When the transmission screw 3 rotates, the force generated by the threaded connection will drive the internal thread transmission slider 4 to move up and down linearly along the inner wall of the limiting square groove 5. When the internal thread transmission slider 4 moves up and down linearly, it will drive the valve stem 6 to move up and down linearly. When the valve stem 6 moves up and down linearly, it will drive the valve needle 7 to move up and down linearly. When the valve needle 7 moves up and down linearly, it will cooperate with the valve seat 8 to open and close the lower end of the valve body 1, thereby effectively controlling the refrigerant flow rate inside the lower end of the valve body 1. When the refrigerant flows into the main flow channel 12, some of the refrigerant will be diverted through the secondary flow channel 13 to form a buffer layer, reducing the fluid impact intensity of the main flow channel 12. When flowing out, the secondary flow channel 13 guides the fluid to diffuse evenly, reducing eddies and pressure changes. When the connection between the main flow channel 12 and the secondary flow channel 13 is evenly and gradually narrowed, it will avoid the pressure gradient surge caused by the flow channel change, suppress the generation of cavitation bubbles, and thus reduce the noise of refrigerant flow. Meanwhile, the energy of the refrigerant fluid is dispersed through the filter holes of the metal filter 19, reducing the local flow velocity and the probability of cavitation nuclei formation. At the same time, when the refrigerant enters the secondary flow channel 13, the pressure before and after is balanced by the flow micro-holes 15 that are opened through the middle of the balance chamber 14, further reducing the pressure fluctuations inside the secondary flow channel 13 from being transmitted outward, thereby further reducing the noise of refrigerant flow and meeting the requirements of high-end air conditioning and heat pump systems for low-noise operation.

[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bidirectional noise-reducing throttling electronic expansion valve, characterized in that: Includes a valve body (1), with an inlet (9) and an outlet (10) fixedly connected to the front side and bottom of the lower end of the valve body (1), respectively. The inlet (9) and outlet (10) are respectively fixedly connected to a noise reduction tube (11). The noise reduction tube (11) is composed of a main flow channel (12) and a secondary flow channel (13). A balance cavity (14) is fixedly installed on the inner wall of the secondary flow channel (13). A flow microhole (15) is opened through the middle of the balance cavity (14). A connection port (16) is fixedly installed on the outer opening of the inlet (9) and outlet (10). A positioning ring (18) is fixedly installed on the outer side of the connection port (16). A metal filter screen (19) is movably connected to the inner wall of the positioning ring (18).

2. The bidirectional noise-reducing throttling electronic expansion valve according to claim 1, characterized in that: A stepper motor (2) is fixedly installed on the upper end of the valve body (1), and a transmission screw (3) is fixedly installed on the rotor part of the lower end of the stepper motor (2). The outer curved surface of the transmission screw (3) is threaded with an internal thread transmission slider (4), and the outer end of the internal thread transmission slider (4) is movably connected to a limit groove (5).

3. The bidirectional noise-reducing throttling electronic expansion valve according to claim 2, characterized in that: The limiting groove (5) is fixedly installed through the middle of the upper end of the valve body (1). The valve stem (6) is fixedly installed at the bottom of the internal thread transmission slider (4). The valve needle (7) is fixedly installed at the bottom of the valve stem (6). The valve seat (8) is fixedly installed in the middle of the lower end of the valve body (1), and the inner wall of the middle part of the valve seat (8) matches the outer end of the valve needle (7).

4. The bidirectional noise-reducing throttling electronic expansion valve according to claim 3, characterized in that: The diameter of the main channel (12) is larger than the diameter of the secondary channel (13), and the connection between the main channel (12) and the secondary channel (13) is uniformly and gradually narrowing.

5. The bidirectional noise-reducing throttling electronic expansion valve according to claim 4, characterized in that: There are several flow micropores (15), which are symmetrically distributed in sequence with respect to the balance cavity (14). The openings of the flow micropores (15) are arc-shaped.

6. The bidirectional noise-reducing throttling electronic expansion valve according to claim 5, characterized in that: A connecting flange (17) is fixedly installed at the outer end of the connecting port (16).

7. The bidirectional noise-reducing throttling electronic expansion valve according to claim 6, characterized in that: The positioning ring (18) has a positioning groove on its inner wall, and the metal filter (19) has a positioning boss on its outer end, and the positioning boss is movably connected to the inner wall of the positioning groove.

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