Energy-saving expansion valve

Abstract

The utility model provides an energy-saving expansion valve, and belongs to the technical field of air conditioner parts. The problems that in the prior art, an expansion valve is large in energy consumption and large in size are solved. The energy-saving expansion valve comprises a tubular valve body, a male valve element and a female valve element are arranged in the valve body, a defrosting section, a throttling section and a receding section are arranged on a connecting plug of the male valve element, the throttling section and the receding section are located on the two sides of the defrosting section respectively, the diameter of the defrosting section, the diameter of the throttling section and the diameter of the receding section are sequentially decreased, and under the action of an elastic piece, the defrosting section is connected with the throttling section. When the side wall of the defrosting section is opposite to the inner wall of the throttling ring, a defrosting channel is formed, when the male valve element moves to the position where the side wall of the throttling section is opposite to the inner wall of the throttling ring, a throttling channel is formed, and when the male valve element moves to the position where the side wall of the receding section is opposite to the inner wall of the throttling ring, a receding channel with certain flow is formed. The utility model has the advantages of defrosting function, energy conservation, carbon reduction and compact structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning components and relates to an energy-saving expansion valve. Background Art

[0002] The expansion valve is an important component of the refrigeration device, and its main function is to throttle and reduce pressure and regulate air flow. For example, a Chinese patent document discloses an expansion valve (application number: 202111426601.5), which includes a main valve body and a defrost valve body. Both ends of the defrost valve body are connected to the main valve body. A valve core assembly is provided in the main valve body between the two ends of the defrost valve body. The defrost valve body has two limit parts, and both limit parts have flow holes that are arranged along the length of the defrost valve body. A defrost valve core that can slide and block the flow hole is provided between the two limit parts. Auxiliary springs are provided between the defrost valve core and the two limit parts, and the defrost valve core can be separated from the two limit parts under the action of the auxiliary spring. The starting elastic force value of the main spring is greater than the elastic force value when the auxiliary spring is compressed to the defrost valve core to block the flow hole. The expansion valve has the following deficiencies during use: after adding the defrost valve body, on the one hand, the volume of the expansion valve is increased; on the other hand, during defrosting, the flow rate in the defrost valve body is large, which does not meet the development requirements of energy conservation and carbon reduction. Summary of the invention

[0003] The purpose of the utility model is to solve the above problems in the existing technology and propose an energy-saving expansion valve. The technical problem to be solved by the utility model is how to make the self-balancing expansion valve have the defrosting function while achieving energy saving, carbon reduction and compact structure.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] The throttling ring is an annular throttling ring formed on the inner wall of the female valve core, and an elastic member for driving the male valve core to move is also provided in the valve body. The throttling ring is an annular throttling ring formed on the inner wall of the female valve core. The throttling ring is an annular throttling ring formed on the inner wall of the male ... throttling ring. The throttling ring is an annular throttling ring formed on the inner wall of the throttling ring. The throttling ring is an annular throttling ring formed on the inner wall of the throttling ring. The throttling ring is an annular throttling ring formed on the inner wall of the throttling ring. The throttling ring is an annular throttling ring formed on the inner wall of the throttling ring. The throttling ring is an annular

[0006] The energy-saving expansion valve adds a defrost section and a yield section to the plug connector of the male valve core. On the one hand, in the initial state, the side wall of the defrost section is opposite to the inner wall of the throttling ring and forms a defrost channel. In addition, the diameter of the defrost section is large, so that the passing area of ​​the defrost channel formed by the defrost section and the throttling ring is small, and only a small amount of air can pass through, thereby reducing the power consumption in the defrost stage, thereby meeting the development requirements of energy conservation and carbon reduction; on the other hand, during heating, a yield channel with a certain flow rate is formed between the side wall of the yield section of the plug connector and the inner wall of the throttling ring, so that a solenoid valve can be set at the refrigeration inlet of the valve body to control The heating flow rate can be adjusted (to achieve special user requirements such as remote adjustment), so that the volume of the energy-saving expansion valve can be smaller and the structure can be more compact, or a male valve core and a female valve core of the same structure can be arranged on the refrigeration inlet side of the valve body, so that the energy-saving expansion valve itself can meet the control of the cooling mode and the heating mode at the same time, and there is no need to set up an additional solenoid valve to meet the diverse needs of users. At this time, a yield section is arranged on the plug connector of the male valve core, so that the yield channel formed by the side wall of the yield section and the inner wall of the throttling ring has a larger passing area, which is beneficial to improving the heating or cooling effect.

[0007] In the above energy-saving expansion valve, the outer wall of the male valve core has a positioning step portion, and when the male valve core moves to a position where the positioning step portion abuts against the female valve core, the side wall of the give-way section is arranged opposite to the inner wall of the throttling ring and forms the give-way channel. By arranging the positioning step portion that abuts against the female valve core on the outer wall of the male valve core, the passing area of ​​the give-way channel formed by the side wall of the give-way section and the inner wall of the throttling ring remains stable and has a large passing area, which is conducive to improving the heating effect and heating efficiency.

[0008] In the above-mentioned energy-saving expansion valve, a cylindrical positioning sleeve is fixedly provided in the valve body, and a cylindrical spring seat is movably provided between the positioning sleeve and the male valve core, the spring seat sleeve is provided on the outer side of the male valve core, the elastic member includes a first spring abutting between the positioning sleeve and the spring seat and a second spring abutting between the male valve core and the female valve core, the spring coefficient of the first spring is greater than the spring coefficient of the second spring, and the inner wall of the spring seat has a limiting step portion for the male valve core to abut against. The setting of the first spring and the fact that the stiffness coefficient of the first spring is greater than the stiffness coefficient of the second spring enable the male valve core to better form multi-stage flow regulation by compressing the first spring in the cooling mode after the male valve core abuts against the limit step portion, while the setting of the second spring enables the male valve core to compress the second spring in the heating mode so that a yield channel with a certain flow rate can be formed between the side wall of the yield section on the male valve core plug-in connector and the inner wall of the throttling ring of the female valve core, which is beneficial to the heating effect, that is, the compression directions of the first spring and the second spring are opposite to each other, so as to match the position settings of the yield section and the throttling section, so that the energy-saving expansion valve can realize the switching of defrosting, cooling and heating states only by moving the male valve core along the axial direction of the valve body, and the structure is more compact and reasonable.

[0009] In the above energy-saving expansion valve, the inner wall of the male valve core has an inner step portion and the outer wall thereof has an outer step portion, the second spring is arranged between the spring seat and the male valve core, and the two ends of the second spring are respectively arranged to abut on the outer step portion and the female valve core, and the elastic member also includes a third spring embedded in the male valve core, and the two ends of the third spring are respectively arranged to abut on the inner step portion and the limit step portion. By adding the third spring, the energy-saving expansion valve can better form a control mode of multiple flow levels, and further make the movement of the male valve core more precise. In addition, by embedding the third spring in the male valve core, the third spring can be better positioned, which is conducive to the movement of the male valve core along the axial direction of the valve body.

[0010] In the above-mentioned energy-saving expansion valve, the outer wall of the male valve core has an annular protrusion, and the elastic member also includes a third spring. The second spring and the third spring are both located between the spring seat and the male valve core, and the second spring and the third spring are respectively located on both sides of the protrusion, and the two ends of the second spring are respectively abutted on the protrusion and the female valve core, and the two ends of the third spring are respectively abutted on the protrusion and the limit step. By adding the third spring, the energy-saving expansion valve can better form a control mode of multiple flow levels, and further make the movement of the male valve core more precise. In addition, by setting the protrusion on the outer wall of the male valve core, the specifications of the second spring and the third spring can be kept consistent after installation, reducing the types of parts.

[0011] In the above-mentioned energy-saving expansion valve, the outer peripheral surface of the throttling section has a plurality of throttling surfaces in the shape of annular rings and having different outer diameters in the axial direction, and the inner peripheral surface of the throttling ring is an annular mating surface. When the throttling section moves to a position opposite to the throttling ring, a throttling channel is formed between the mating surface and the relative throttling surface. The outer peripheral surface of the throttling section has a plurality of throttling surfaces in the shape of annular rings and having different outer diameters in the axial direction, so that the energy-saving expansion valve can effectively maintain low-frequency operation for a long time and is more energy-saving. In addition, through the movement of the male valve core, the plurality of throttling surfaces on the plug-in joint throttling section are respectively moved to the position opposite to the throttling ring and form a throttling channel. The flow rate is adjusted by moving and staying in the position of the throttling section, so that the length of the valve body is greatly reduced while the energy-saving expansion valve has multiple cooling modes, heating modes and defrosting functions, so that the structure of the valve body is more compact, and the moving distance of the male valve core can also be reduced.

[0012] In the above energy-saving expansion valve, the male valve core has a flow passage inside that connects the two sides of the male valve core, the flow passage extends along the axial direction of the valve body, the end of the flow passage close to the plug joint penetrates the side wall of the male valve core, and the end of the flow passage away from the plug joint penetrates the end of the male valve core. By opening the flow passage inside the male valve core and making the extension direction of the flow passage consistent with the flow direction of the refrigerant in the valve body, the male valve core can be better promoted to move along the axial direction of the valve body.

[0013] In the above-mentioned energy-saving expansion valve, the inner wall of the female valve core is also provided with an annular flow-stabilizing ring in the circumferential direction. The flow-stabilizing ring is arranged on the side away from the male valve core, and the flow-stabilizing ring and the throttling ring are fitted together to form a whole, and the aperture of the flow-stabilizing ring is larger than the aperture of the throttling ring. The plug connector can introduce the refrigerant into the flow-stabilizing ring in the initial stage, and the inner hole of the flow-stabilizing ring plays a role of gathering flow, making the flow of the refrigerant more stable. The aperture of the flow-stabilizing ring is larger than the aperture of the throttling ring, and the flow-stabilizing ring and the throttling ring are fitted together to form a whole, so that the flow-stabilizing ring is located between the male valve core and the throttling ring, so that the flow-stabilizing ring can play a transitional role, thereby making the moving speed of the female valve core more stable.

[0014] In the above-mentioned energy-saving expansion valve, there are two male valve cores and two female valve cores respectively, the two female valve cores are abutted against and fixed on the valve body along the length direction of the valve body, the two male valve cores are slidably arranged in the two female valve cores respectively, and the plug connectors of the two male valve cores are arranged relatively. By arranging two male valve cores and two female valve cores in the valve body respectively, the energy-saving expansion valve can meet the control of the cooling mode and the heating mode at the same time, and no additional solenoid valve is required to meet the diverse needs of users. At the same time, by arranging a yield section on the plug connector of the male valve core, the passing area of ​​the yield channel formed by the side wall of the yield section and the inner wall of the throttling ring is larger, which is conducive to improving the heating or cooling effect.

[0015] In the above energy-saving expansion valve, one end of the first spring is sleeved on the spring seat, and the other end is sleeved or embedded in the positioning sleeve. By sleeved one end of the first spring on the spring seat, and the other end on the positioning sleeve, the position stability can be maintained when the first spring is compressed or released, avoiding displacement along the radial direction of the valve body, thereby better pushing the spring seat.

[0016] Compared with the prior art, the advantages of the energy-saving expansion valve are as follows: the energy-saving expansion valve adds a defrost section and a yield section to the plug connector of the male valve core, so that, in the initial state, the side wall of the defrost section is opposite to the inner wall of the throttling ring and forms a defrost channel. In addition, the diameter of the defrost section is relatively large, so that the passing area of ​​the defrost channel formed by the defrost section and the throttling ring is relatively small, and only a small amount of airflow can pass through, thereby reducing the power consumption in the defrost stage, thereby meeting the development requirements of energy conservation and carbon reduction. At the same time, the compression directions of the first spring and the second spring are opposite to each other, so as to match the position setting of the yield section and the throttling section, so that the energy-saving expansion valve can realize the switching of the defrost, cooling and heating states only by moving the male valve core along the axial direction of the valve body, and the structure is more compact and reasonable. On the one hand, during heating, a yield channel with a certain flow rate is formed between the side wall of the yield section of the plug connector and the inner wall of the throttling ring, so that a solenoid valve can be set at the refrigeration inlet of the valve body to control the regulation of the heating flow rate (to achieve special user needs such as remote regulation), thereby making the volume of the energy-saving expansion valve smaller and the structure more compact; or a male valve core and a female valve core of the same structure can be set on the refrigeration inlet side of the valve body, so that the energy-saving expansion valve itself can meet the control of the cooling mode and the heating mode at the same time, and there is no need to set up an additional solenoid valve to meet the diverse needs of users. At this time, by setting a yield section on the plug connector of the male valve core, the yield channel formed by the side wall of the yield section and the inner wall of the throttling ring has a larger passing area, which is beneficial to improving the heating or cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural cross-sectional view of the initial state of the energy-saving expansion valve in the first embodiment.

[0018] Figure 2 It is a partial structural cross-sectional view of the energy-saving expansion valve in the first embodiment when heating.

[0019] Figure 3 It is a partial structural cross-sectional view of the energy-saving expansion valve in the first embodiment when cooling.

[0020] Figure 4 It is a structural cross-sectional view of the initial state of the energy-saving expansion valve in the second embodiment.

[0021] Figure 5 It is a structural cross-sectional view of the initial state of the energy-saving expansion valve in the third embodiment.

[0022] Figure 6 It is a structural cross-sectional view of the initial state of the energy-saving expansion valve in the fourth embodiment.

[0023] In the figure, 1, valve body; 2, male valve core; 2a, plug connector; 2a1, throttling section; 2a11, throttling surface; 2a2, defrosting section; 2a3, give-way section; 2b, inner step; 2c, outer step; 2d, raised portion; 2e, positioning step; 3, female valve core; 3a, throttling ring; 3a1, matching surface; 3b, steady flow ring; 4, elastic member; 4a, first spring; 4b, second spring; 4c, third spring; 5, throttling channel; 6, give-way channel; 7, defrosting channel; 8, positioning sleeve; 9, spring seat; 9a, limit step; 10, flow passage. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] Embodiment 1

[0026] An energy-saving expansion valve, referring to Figure 1-3 , comprising a tubular valve body 1, a male valve core 2 and a female valve core 3 are arranged in the valve body 1, the end of the male valve core 2 has a columnar plug connector 2a, the female valve core 3 is cylindrical and is sleeved on the plug connector 2a of the male valve core 2, and an annular throttling ring 3a is provided on the inner wall of the female valve core 3, the valve body 1 is also provided with an elastic member 4 for driving the male valve core 2 to move, and the plug connector 2a of the male valve core 2 is provided with a defrosting section 2a2 and throttling sections 2a1 respectively located on both sides of the defrosting section 2a2 and a yield section 2a3, the diameters of the defrost section 2a2, the throttling section 2a1 and the yield section 2a3 are reduced in sequence, and under the action of the elastic member 4, when the side wall of the defrost section 2a2 is opposite to the inner wall of the throttling ring 3a, a defrost channel 7 is formed, when the male valve core 2 moves to the point where the side wall of the throttling section 2a1 is opposite to the inner wall of the throttling ring 3a, a throttling channel 5 is formed, and when the male valve core 2 moves to the point where the side wall of the yield section 2a3 is opposite to the inner wall of the throttling ring 3a, a yield channel 6 with a certain flow rate is formed.

[0027] Specifically, the outer wall of the male valve core 2 has a positioning step 2e. When the male valve core 2 moves to the position where the positioning step 2e abuts against the female valve core 3, the side wall of the make way section 2a3 is arranged opposite to the inner wall of the throttling ring 3a to form the make way channel 6; the outer peripheral surface of the throttling section 2a1 has a plurality of annular throttling surfaces 2a11 with different outer diameters along the axial direction, and the inner peripheral surface of the throttling ring 3a is an annular matching surface 3a1. When the throttling section 2a1 moves to a position opposite to the throttling ring 3a, a throttling channel 5 is formed between the matching surface 3a1 and the relative throttling surface 2a11; the interior of the male valve core 2 has a flow passage 10 connecting the two sides of the male valve core 2, and the flow passage 10 is distributed along the axial extension of the valve body 1. The flow passage 10 passes through the side wall of the male valve core 2 near the end of the plug connector 2a, and passes through the end of the male valve core 2 away from the end of the plug connector 2a.

[0028] More specifically, a cylindrical positioning sleeve 8 is fixedly provided in the valve body 1, and a cylindrical spring seat 9 is movably provided between the positioning sleeve 8 and the male valve core 2, the spring seat 9 is sleeved on the outside of the male valve core 2, the elastic member 4 includes a first spring 4a abutting between the positioning sleeve 8 and the spring seat 9 and a second spring 4b abutting between the male valve core 2 and the female valve core 3, the spring constant of the first spring 4a is greater than the spring constant of the second spring 4b, and the inner wall of the spring seat 9 has a limiting step portion 9a for the male valve core 2 to abut against.

[0029] Furthermore, the inner wall of the female valve core 3 is circumferentially provided with an annular flow stabilizing ring 3b, which is arranged on a side away from the male valve core 2, and the flow stabilizing ring 3b is fitted with the throttling ring 3a to form a whole, and the aperture of the flow stabilizing ring 3b is larger than the aperture of the throttling ring 3a.

[0030] The following will explain the working principle of this energy-saving expansion valve:

[0031] One end of the valve body 1 is the cooling inlet, and the other end is the heating inlet. In the shutdown state, the male valve core 2 and the female valve core 3 do not move under the action of the elastic member 4. When the outdoor unit is defrosting or the indoor unit is cooling, the refrigerant enters from the cooling inlet and passes through the heating inlet in sequence.

[0032] In the initial state, the side wall of the defrost section 2a2 of the male valve core 2 is opposite to the inner wall of the throttling ring 3a of the female valve core 3 and forms a defrost channel 7, so that the refrigeration inlet can be connected to the heating inlet through the male valve core 2 and the female valve core 3. In addition, the diameters of the defrost section 2a2, the throttling section 2a1 and the yield section 2a3 are reduced successively, so that the passing area of ​​the defrost channel 7 formed by the defrost section 2a2 and the throttling ring 3a is small, and only a small amount of airflow can pass through, so that the power consumption in the defrost stage is less, which meets the development requirements of energy conservation and carbon reduction. Therefore, when the outdoor unit is defrosted before the air-conditioning equipment is started or the outdoor unit is defrosted during the indoor heating process, a smaller flow of refrigerant enters from the refrigeration inlet, and a smaller pressure difference does not need to push the male valve core 2 and the female valve core 3, so that the refrigerant can pass through and flow out from the heating inlet to perform heating and defrosting of the outdoor unit.

[0033] After the outdoor unit defrosts, the indoor unit heats normally. At this time, the pressure difference at both ends of the valve body 1 is relatively large, and the refrigerant flows in from the heating inlet. The gap between the plug connector 2a of the male valve core 2 and the throttling ring 3a of the female valve core 3 is not sufficient to meet the refrigerant's passage requirements. Under the action of the large pressure difference, the refrigerant will push the male valve core 2 near the refrigeration inlet to compress the second spring 4b to slide toward the refrigeration inlet and quickly move to a position where the give-way section 2a3 is opposite to the throttling ring 3a, and a give-way channel 6 is formed between the give-way section 2a3 and the throttling ring 3a. At this time, the positioning step 2e of the male valve core 2 abuts against the end of the female valve core 3, so that the male valve core 2 cannot slide further toward the refrigeration inlet, thereby maximizing and maintaining the passing area of ​​the give-way channel 6. In addition, in this embodiment, the preferred heating state is controlled by the solenoid valve set at the refrigeration inlet of the valve body 1. So far, in the heating stage, the energy-saving expansion valve does not adjust the flow through the valve body 1, and the work of adjusting the flow is completed by the solenoid valve (to achieve special control requirements such as remote adjustment). In this way, the energy-saving expansion valve can be smaller in size and more compact in structure.

[0034] When the room is cooled, the refrigerant flows in from the cooling inlet, and the gap between the plug connector 2a of the male valve core 2 and the throttling ring 3a of the female valve core 3 is not enough to meet the refrigerant's passing needs. Under the action of a large pressure difference, the refrigerant will accelerate the male valve core 2 to move in the opposite direction, compress the first spring 4a, and slide toward the heating inlet, so that the throttling section 2a1 on the plug connector 2a quickly moves to a position opposite to the throttling ring 3a, and the throttling surfaces 2a11 of the throttling section 2a1 on the plug connector 2a will gradually move away from the throttling ring 3a on the female valve core 3, The throttling surfaces 2a11 of the throttling section 2a1 of the plug connector 2a form throttling channels 5 with the inner circumferential surface of the throttling ring 3a on the female valve core 3 in sequence. In different refrigeration states, such as low-temperature, medium-low refrigeration, intermediate refrigeration, low-frequency refrigeration, rated refrigeration or maximum refrigeration, the pressure difference at both ends of the valve body is different, thereby pushing the male valve core 2 to compress the first spring 4a to different degrees, so that the throttling surfaces 2a11 of the throttling section 2a1 of the plug connector 2a respectively form throttling channels 5 with different passing areas with the throttling ring 3a to adjust the flow rate.

[0035] Embodiment 2

[0036] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 4 The inner wall of the male valve core 2 has an inner step portion 2b and the outer wall thereof has an outer step portion 2c. The second spring 4b is arranged between the spring seat 9 and the male valve core 2, and the two ends of the second spring 4b are respectively abutted on the outer step portion 2c and the female valve core 3. The elastic member 4 also includes a third spring 4c embedded in the male valve core 2, and the two ends of the third spring 4c are respectively abutted on the inner step portion 2b and the limit step portion 9a.

[0037] The cooling modes of multiple flow levels are as follows:

[0038] Low-medium-low refrigeration mode: the male valve core 2 moves toward the heating inlet direction, and the third spring 4c is partially compressed.

[0039] Intermediate cooling mode: the male valve core 2 continues to compress the third spring 4 c until the male valve core 2 abuts against the spring seat 9 .

[0040] Low-frequency refrigeration mode: the male valve core 2 pushes the spring seat 9, and the first spring 4a is partially compressed.

[0041] Rated refrigeration mode: the male valve core 2 continues to push the spring seat 9, and the first spring 4a is further compressed.

[0042] Maximum cooling mode: the male valve core 2 further pushes the spring seat 9 until the spring seat 9 abuts against the positioning sleeve 8 and is difficult to move further.

[0043] Embodiment 3

[0044] The structure and principle of this embodiment are basically the same as those of the second embodiment, except that: Figure 5 The outer wall of the male valve core 2 has an annular protrusion 2d, and the elastic member 4 also includes a third spring 4c. The second spring 4b and the third spring 4c are both located between the spring seat 9 and the male valve core 2, and the second spring 4b and the third spring 4c are respectively located on both sides of the protrusion 2d, and the two ends of the second spring 4b are respectively abutted on the protrusion 2d and the female valve core 3, and the two ends of the third spring 4c are respectively abutted on the protrusion 2d and the limiting step 9a.

[0045] Embodiment 4

[0046] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 There are two male valve cores 2 and two female valve cores 3 respectively. The two female valve cores 3 are abutted against and fixed on the valve body 1 along the length direction of the valve body 1. The two male valve cores 2 are slidably arranged in the two female valve cores 3 respectively, and the plug joints 2a of the two male valve cores 2 are arranged oppositely; one end of the first spring 4a located at the cooling inlet end is sleeved on the spring seat 9, and the other end thereof is sleeved on the positioning sleeve 8; one end of the first spring 4a located at the heating inlet end is sleeved on the spring seat 9, and the other end thereof is embedded in the positioning sleeve 8; the second spring 4b is located between the spring seat 9 and the male valve core 2, and the two ends of the second spring 4b are respectively abutted against the outer step portion 2c and the female valve core 3.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An energy-saving expansion valve, comprising a tubular valve body (1), wherein a male valve core (2) and a female valve core (3) are arranged in the valve body (1), wherein the end of the male valve core (2) has a columnar plug connector (2a), wherein the female valve core (3) is cylindrical and is sleeved on the plug connector (2a) of the male valve core (2), and an annular throttling ring (3a) is arranged on the inner wall of the female valve core (3), wherein an elastic member (4) for driving the male valve core (2) to move is further arranged in the valve body (1), wherein the elastic member (4) is characterized in that: The plug connector (2a) of the male valve core (2) is provided with a defrost section (2a2) and a throttling section (2a1) and a clearance section (2a3) respectively located on both sides of the defrost section (2a2). The diameters of the defrost section (2a2), the throttling section (2a1) and the clearance section (2a3) are successively reduced, and under the action of the elastic member (4), when the side wall of the defrost section (2a2) is opposite to the inner wall of the throttling ring (3a), a defrost channel (7) is formed; when the male valve core (2) moves to the point where the side wall of the throttling section (2a1) is opposite to the inner wall of the throttling ring (3a), a throttling channel (5) is formed; and when the male valve core (2) moves to the point where the side wall of the clearance section (2a3) is opposite to the inner wall of the throttling ring (3a), a clearance channel (6) with a certain flow rate is formed.

2. An energy-saving expansion valve according to claim 1, characterized in that: The outer wall of the male valve core (2) has a positioning step portion (2e), and when the male valve core (2) moves to a position where the positioning step portion (2e) abuts against the female valve core (3), the side wall of the clearance section (2a3) is arranged opposite to the inner wall of the throttling ring (3a) to form the clearance channel (6).

3. An energy-saving expansion valve according to claim 1 or 2, characterized in that: A cylindrical positioning sleeve (8) is fixedly arranged in the valve body (1), and a cylindrical spring seat (9) is movably arranged between the positioning sleeve (8) and the male valve core (2), and the spring seat (9) is sleeved on the outer side of the male valve core (2). The elastic member (4) comprises a first spring (4a) abuttingly arranged between the positioning sleeve (8) and the spring seat (9) and a second spring (4b) abuttingly arranged between the male valve core (2) and the female valve core (3), the spring constant of the first spring (4a) is greater than the spring constant of the second spring (4b), and the inner wall of the spring seat (9) has a limiting step portion (9a) for the male valve core (2) to abut against.

4. An energy-saving expansion valve according to claim 3, characterized in that: The inner wall of the male valve core (2) has an inner step portion (2b) and the outer wall thereof has an outer step portion (2c); the second spring (4b) is arranged between the spring seat (9) and the male valve core (2), and the two ends of the second spring (4b) are respectively abutted against the outer step portion (2c) and the female valve core (3); the elastic member (4) further comprises a third spring (4c) embedded in the male valve core (2), and the two ends of the third spring (4c) are respectively abutted against the inner step portion (2b) and the limit step portion (9a).

5. An energy-saving expansion valve according to claim 3, characterized in that: The outer wall of the male valve core (2) has an annular protrusion (2d), and the elastic member (4) also includes a third spring (4c). The second spring (4b) and the third spring (4c) are both located between the spring seat (9) and the male valve core (2), and the second spring (4b) and the third spring (4c) are respectively located on both sides of the protrusion (2d), and the two ends of the second spring (4b) are respectively abutted against the protrusion (2d) and the female valve core (3), and the two ends of the third spring (4c) are respectively abutted against the protrusion (2d) and the limiting step (9a).

6. An energy-saving expansion valve according to claim 3, characterized in that: The outer peripheral surface of the throttling section (2a1) has a plurality of annular throttling surfaces (2a11) with different outer diameters along the axial direction, and the inner peripheral surface of the throttling ring (3a) is an annular matching surface (3a1). When the throttling section (2a1) moves to a position opposite to the throttling ring (3a), a throttling channel (5) is formed between the matching surface (3a1) and the opposite throttling surface (2a11).

7. An energy-saving expansion valve according to claim 6, characterized in that: The male valve core (2) has a flow passage (10) inside that connects the two sides of the male valve core (2). The flow passage (10) extends along the axial direction of the valve body (1). The end of the flow passage (10) close to the plug connector (2a) passes through the side wall of the male valve core (2), and the end of the flow passage (10) away from the plug connector (2a) passes through the end of the male valve core (2).

8. An energy-saving expansion valve according to claim 6, characterized in that: The inner wall of the female valve core (3) is also provided with an annular flow stabilizing ring (3b) in the circumferential direction. The flow stabilizing ring (3b) is arranged on a side away from the male valve core (2), and the flow stabilizing ring (3b) and the throttling ring (3a) are fitted together to form a whole. The aperture of the flow stabilizing ring (3b) is larger than the aperture of the throttling ring (3a).

9. An energy-saving expansion valve according to claim 3, characterized in that: There are two male valve cores (2) and two female valve cores (3), respectively. The two female valve cores (3) are abutted against and fixed on the valve body (1) along the length direction of the valve body (1), and the two male valve cores (2) are slidably arranged in the two female valve cores (3), respectively, and the plug connectors (2a) of the two male valve cores (2) are arranged relative to each other.

10. An energy-saving expansion valve according to claim 3, characterized in that: One end of the first spring (4a) is sleeved on the spring seat (9), and the other end is sleeved or embedded in the positioning sleeve (8).

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