High-precision electronic expansion valve

Abstract

The utility model discloses a high-precision electronic expansion valve which is characterized in that a communicating groove and a refrigerant liquid discharging channel communicated with the communicating groove are formed in a valve body, a first refrigerant liquid inlet channel and a second refrigerant liquid inlet channel communicated with the first refrigerant liquid inlet channel are formed in a valve seat, and a valve rod is arranged in the communicating groove in a sliding mode; the bottom of the valve rod is fixedly connected with a first valve needle, the side face of the valve rod is fixedly connected with an L-shaped rod, and the bottom of the L-shaped rod is inserted into the second refrigerant liquid inlet channel and fixedly connected with a second valve needle arranged in the second refrigerant liquid inlet channel in a sliding mode. When the refrigerator is frozen, the first valve needle abuts against the outlet end of the first refrigerant liquid inlet channel, the second valve needle slides out of the second refrigerant liquid inlet channel, refrigerants can enter the communicating groove from the second refrigerant liquid inlet channel, the constant refrigerating capacity of the refrigerator is kept, and it is guaranteed that fresh food in the refrigerator is not frozen to be damaged; therefore, economic loss caused by damage of the electromagnetic electronic expansion valve is avoided, and better use experience is brought to a user.

Description

Technical Field

[0001] This utility model relates to the field of expansion valve technology, specifically to a high-precision electronic expansion valve. Background Technology

[0002] An electronic expansion valve is a key component in refrigeration equipment used to control the flow of refrigerant. Electronic expansion valves are divided into electromagnetic electronic expansion valves and electric electronic expansion valves. The working principle of an electromagnetic electronic expansion valve is as follows: when the electromagnetic coil is energized, a magnetic field is generated. The magnetic force acts on the valve core, causing it to be displaced, thereby changing the flow area between the valve core and the valve seat, and realizing the control of the refrigerant flow.

[0003] However, when electromagnetic electronic expansion valves are used in refrigerators, they require a constant power supply, which necessitates ensuring uninterrupted circuitry. If the internal circuit of the electromagnetic electronic expansion valve malfunctions and fails to supply power, the valve remains open, causing a significant increase in the refrigerator's cooling capacity. This results in excessively low internal temperatures, causing food in the refrigerator's cooling compartment to freeze and spoil, leading to economic losses for the user. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision electronic expansion valve to overcome the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision electronic expansion valve, comprising: a valve body, a valve seat fixedly connected to the bottom of the valve body, a connecting groove and a refrigerant drainage channel connecting the connecting groove in the valve body, a first refrigerant inlet channel and a second refrigerant inlet channel connected to the first refrigerant inlet channel in the valve seat, a valve stem slidably disposed in the connecting groove, a first valve needle fixedly connected to the bottom of the valve stem, an L-shaped rod fixedly connected to the side of the valve stem, the bottom of the L-shaped rod being inserted into the second refrigerant inlet channel and fixedly connected to a second valve needle slidably disposed in the second refrigerant inlet channel, when the first valve needle abuts against the outlet end of the first refrigerant inlet channel, the second valve needle extends into the first refrigerant inlet channel, so that the second refrigerant inlet channel connects the first refrigerant inlet channel and the connecting groove.

[0006] Furthermore, a second sealing ring is fixedly installed on the inner side of the outlet end of the first refrigerant inlet channel.

[0007] Furthermore, a third sealing ring is fixedly sleeved on the outer side of the second valve needle.

[0008] Furthermore, the valve body has a sliding groove and a through hole connecting the sliding groove. An electromagnet is fixedly installed in the sliding groove. The top of the valve stem passes through the through hole and the hole set in the center of the electromagnet and is fixedly connected to a magnetic plunger that is slidably installed in the sliding groove. The top of the magnetic plunger is connected to the inner wall of the sliding groove by a spring.

[0009] Furthermore, the electromagnet includes a housing, which is fixedly connected to the inner wall of the slide groove. An installation groove is provided inside the housing, and a circular iron core is fixedly connected in the installation groove. A coil is wound around the outer side of the circular iron core.

[0010] Furthermore, a first sealing ring is fixedly installed on the inner side wall of the end of the through hole near the connecting groove.

[0011] The high-precision electronic expansion valve provided by this utility model has the following advantages in the above technical solution:

[0012] This invention features an L-shaped rod on one side of the valve stem, with the bottom of the L-shaped rod inserted into the second refrigerant inlet channel and fixedly connected to a second valve needle. The plane at the bottom of the second valve needle is lower than the plane at the bottom of the first valve needle. When the electromagnetic electronic expansion valve malfunctions and is not energized, the first valve needle will press against the outlet end of the first refrigerant inlet channel, while the second valve needle will slide out of the second refrigerant inlet channel. This allows the refrigerant to enter the connecting groove from the second refrigerant inlet channel and then be discharged through the refrigerant drain channel, maintaining a constant cooling capacity in the refrigerator. This ensures that the fresh food inside the refrigerator is not frozen, thus avoiding economic losses caused by damage to the electromagnetic electronic expansion valve and providing users with a better user experience.

[0013] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0014] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 A structural schematic diagram provided for an embodiment of this utility model;

[0017] Figure 2 A schematic diagram of the valve stem structure provided for an embodiment of this utility model;

[0018] Figure 3 Provided for the embodiments of this utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 4 Provided for the embodiments of this utility model Figure 1 Enlarged view of section B in the middle.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Valve body; 11. Slide groove; 12. Connecting groove; 13. Refrigerant drain channel; 14. Through hole; 141. First sealing ring; 2. Valve seat; 21. First refrigerant inlet channel; 22. Second sealing ring; 23. Second refrigerant inlet channel; 3. Valve stem; 31. L-shaped rod; 32. Second valve needle; 4. First valve needle; 33. Third sealing ring; 5. Magnetic plunger; 6. Housing; 61. Mounting groove; 62. Iron core; 63. Coil; 7. Spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0023] Please see Figures 1-4 A high-precision electronic expansion valve includes: a valve body 1, a valve seat 2 fixedly connected to the bottom of the valve body 1, a connecting groove 12 and a refrigerant drainage channel 13 connected to the connecting groove 12 in the valve body 1, a first refrigerant inlet channel 21 and a second refrigerant inlet channel 23 connected to the first refrigerant inlet channel 21 on the valve seat 2, a valve stem 3 slidably disposed in the connecting groove 12, a first valve needle 4 fixedly connected to the bottom of the valve stem 3, an L-shaped rod 31 fixedly connected to the side of the valve stem 3, the bottom of the L-shaped rod 31 inserted into the second refrigerant inlet channel 23 and fixedly connected to a second valve needle 32 slidably disposed in the second refrigerant inlet channel 23, when the first valve needle 4 abuts against the outlet end of the first refrigerant inlet channel 21, the second valve needle 32 extends into the first refrigerant inlet channel 21, so that the second refrigerant inlet channel 23 connects the first refrigerant inlet channel 21 and the connecting groove 12.

[0024] Specifically, this utility model provides an L-shaped rod 31 on one side of the valve stem 3, with the bottom of the L-shaped rod 31 inserted into the second refrigerant inlet channel 23 and fixedly connected to a second valve needle 32. The plane at the bottom of the second valve needle 32 is lower than the plane at the bottom of the first valve needle 4. When the electromagnetic electronic expansion valve malfunctions and is not powered, the first valve needle 4 will press against the outlet end of the first refrigerant inlet channel 21, while the second valve needle 32 will slide out of the second refrigerant inlet channel 23. This allows the refrigerant to enter the connecting groove 12 from the second refrigerant inlet channel 23 and then be discharged through the refrigerant drain channel 13, maintaining a constant cooling capacity in the refrigerator and ensuring that the fresh food inside the refrigerator is not frozen. This avoids economic losses caused by damage to the electromagnetic electronic expansion valve and provides users with a better user experience.

[0025] Furthermore, a second sealing ring 22 is fixedly installed on the inner side of the outlet end of the first refrigerant inlet channel 21.

[0026] Specifically, by embedding a second sealing ring 22 inside the outlet end of the first refrigerant inlet channel 21, when the first valve needle 4 is pressed against the outlet end of the first refrigerant inlet channel 21, the first valve needle 4 squeezes the second sealing ring 22, thereby improving the sealing performance at this point.

[0027] Furthermore, a third sealing ring 33 is fixedly sleeved on the outer side of the second valve needle 32.

[0028] Specifically, the end of the second valve needle 32 connected to the bottom of the L-shaped rod 31 has an inclined surface. A third sealing ring 33 is fixedly fitted on the outside of the second valve needle 32 at the junction of the inclined surface and the normal side. This ensures the sealing between the second valve needle 32 and the inner wall of the second refrigerant inlet channel 23. When the first valve needle 4 is working normally, the refrigerant cannot enter the connecting groove 12 from the second refrigerant inlet channel 23, thus ensuring the control accuracy of the electromagnetic electronic expansion valve. The second valve needle 32 can be set to be adjustable. For example, if the second valve needle 32 is threadedly connected to the L-shaped rod 31, the total length of the L-shaped rod 31 and the second valve needle 32 can be changed. This allows for adjustment of the refrigerant flow through the electromagnetic electronic expansion valve when it is not working properly, adapting to the refrigeration equipment used in different scenarios.

[0029] Furthermore, the valve body 1 has a slide groove 11 and a through hole 14 connecting the slide groove 11 and the connecting groove 12. An electromagnet is fixedly installed in the slide groove 11. The top of the valve stem 3 passes through the through hole 14 and the hole set in the center of the electromagnet and is fixedly connected to a magnetic plunger 5 that is slidably installed in the slide groove 11. The top of the magnetic plunger 5 is connected to the inner wall of the slide groove 11 by a spring 7. The electromagnet includes a housing 6, which is fixedly connected to the inner wall of the slide groove 11. An installation groove 61 is opened in the housing 6. A circular iron core 62 is fixedly connected in the installation groove 61. A coil 63 is wound around the outer side of the circular iron core 62. A first sealing ring 141 is fixedly installed on the inner side wall of the through hole 14 near the connecting groove 12.

[0030] Specifically, one end of the spring 7 is fixedly connected to the inner wall of the slide groove 11, and the other end of the spring 7 is fixedly connected to the top of the magnetic plunger 5. When no power is applied, the electromagnet does not generate magnetism, so the magnetic plunger 5 generates an attractive force on the annular iron core 62. At the same time, under the elastic force of the spring 7, the magnetic plunger 5 and the top of the electromagnet will be pressed tightly together, and the first valve needle 4 will press against the outlet end of the first refrigerant inlet channel 21. At this time, the second valve needle 32 slides out of the second refrigerant inlet channel 23, so that the first refrigerant inlet channel 21 and the second refrigerant inlet channel 23 are connected, realizing the quantitative flow of refrigerant through the electromagnetic electronic expansion valve, ensuring the normal operation of the refrigerator; when the electromagnetic electronic expansion valve is normally energized... The magnetic force generated by the electromagnet repels the magnetic force generated by the magnetic plunger 5. The repulsive force between them overcomes the elastic force of the spring 7, causing the magnetic plunger 5 to move the first valve needle 4 and the second valve needle 32 upward. This increases the flow area between the first valve needle 4 and the outlet end of the first refrigerant inlet channel 21. As the repulsive force between the electromagnet and the magnetic plunger 5 increases, the flow area between the first valve needle 4 and the outlet end of the first refrigerant inlet channel 21 will also increase, thereby achieving the purpose of adjusting the cooling capacity of the refrigeration equipment. By embedding the first sealing ring 141 on the inner side wall of the through hole 14 near the connecting groove 12, the refrigerant can be prevented from entering the slide groove 11, thus protecting the electromagnet.

[0031] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-precision electronic expansion valve, comprising: A valve body (1) is characterized in that: a valve seat (2) is fixedly connected to the bottom of the valve body (1); a connecting groove (12) and a refrigerant drain channel (13) connecting the connecting groove (12) are provided in the valve body (1); a first refrigerant inlet channel (21) and a second refrigerant inlet channel (23) connecting the first refrigerant inlet channel (21) are provided on the valve seat (2); a valve stem (3) is slidably arranged in the connecting groove (12); a first valve needle (4) is fixedly connected to the bottom of the valve stem (3); and the valve stem... (3) is fixedly connected to an L-shaped rod (31) on its side. The bottom of the L-shaped rod (31) is inserted into the second refrigerant inlet channel (23) and fixedly connected to a second valve needle (32) that is slidably disposed in the second refrigerant inlet channel (23). When the first valve needle (4) is pressed against the outlet end of the first refrigerant inlet channel (21), the second valve needle (32) extends into the first refrigerant inlet channel (21), so that the second refrigerant inlet channel (23) connects the first refrigerant inlet channel (21) and the connecting groove (12).

2. The high-precision electronic expansion valve according to claim 1, characterized in that, A second sealing ring (22) is fixedly installed on the inner side of the outlet end of the first refrigerant inlet channel (21).

3. The high-precision electronic expansion valve according to claim 1, characterized in that, The outer side of the second valve needle (32) is fixedly fitted with a third sealing ring (33).

4. A high-precision electronic expansion valve according to claim 1, characterized in that, The valve body (1) has a sliding groove (11) and a through hole (14) connecting the sliding groove (11) and the through groove (12). An electromagnet is fixedly installed in the sliding groove (11). The top of the valve stem (3) passes through the through hole (14) and the hole set in the center of the electromagnet and is fixedly connected to a magnetic plunger (5) that is slidably set in the sliding groove (11). The top of the magnetic plunger (5) is connected to the inner wall of the sliding groove (11) by a spring (7).

5. A high-precision electronic expansion valve according to claim 4, characterized in that, The electromagnet includes a housing (6), which is fixedly connected to the inner wall of the slide groove (11). An installation groove (61) is provided inside the housing (6), and a circular iron core (62) is fixedly connected inside the installation groove (61). A coil (63) is wound around the outside of the circular iron core (62).

6. A high-precision electronic expansion valve according to claim 5, characterized in that, A first sealing ring (141) is fixedly installed on the inner side wall of the through hole (14) near the connecting groove (12).

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