Thermal expansion valve

Abstract

The thermostatic expansion valve comprises a valve body, an induction diaphragm is arranged in a diaphragm chamber at the top of the valve body, an output interface end is arranged on one side of the valve body, the inside of the output interface end is communicated with the upper section of a valve cavity of the valve body, the inner diameter of the lower section of the valve cavity of the valve body is larger than that of the upper section of the valve cavity, and a plurality of through holes are formed in a spring seat in the bottom end of the lower section of the valve cavity. A spring is fixed on the spring seat, the bottom of the sensing diaphragm is rotatably connected with a valve rod, the valve rod downwards penetrates through the upper section of the valve cavity and the lower section of the valve cavity and is rotatably mounted on a bearing at the upper end of the spring, a valve core is annularly sleeved and fixed on the part, positioned in the lower section of the valve cavity, of the valve rod, and a plurality of blades are fixed on the circumferential side surface of the valve rod between the valve core and the bearing; a pair of magnets is further fixed to the circumferential side face of the valve rod, and a plurality of electromagnets are arranged on the inner wall of the valve cavity of the valve body and correspond to the magnets. The flow entering the upper section of the valve cavity can be greatly increased only by properly controlling the opening degree of the valve element to be matched with flow speed adjustment of the blades, and excessive compression on the spring when the opening degree of the valve element is excessively increased is avoided.

Description

Technical Field

[0001] The utility model relates to the field of expansion valves, in particular to a thermostatic expansion valve. Background Art

[0002] The thermostatic expansion valve is an important component in an air conditioner. The high-temperature and high-pressure refrigerant gas compressed and output by the compressor in the air conditioner first releases heat to the outside through the condenser to form a medium-temperature and high-pressure liquid. The medium-temperature and high-pressure liquid is then throttled and cooled by the thermostatic expansion valve to form a low-temperature and low-pressure liquid. Then, the low-temperature and low-pressure liquid enters the evaporator to absorb the heat of the indoor air passing through the evaporator and forms a medium-temperature and low-pressure refrigerant gas. The medium-temperature and low-pressure refrigerant gas returns to the compressor to be compressed again to form a high-temperature and high-pressure refrigerant gas, thus completing the refrigeration cycle of the air conditioner.

[0003] Among them, the structure of the thermostatic expansion valve is as shown in Figure 1 、 Figure 2 . It includes a valve body 1. The top of the valve body 1 is a diaphragm chamber 2. There is an induction diaphragm 3 in the diaphragm chamber 2. The induction diaphragm 3 divides the interior of the diaphragm chamber 2 into upper and lower parts. One side of the valve body 1 is provided with an output interface end 4. The valve cavity of the valve body 1 is divided into upper and lower sections. The inner diameter of the lower section 5.1 of the valve cavity is larger than the inner diameter of the upper section 5.2 of the valve cavity. And the bottom end of the lower section 5.1 of the valve cavity is arranged at the bottom of the valve body 1. The inside of the output interface end 4 communicates with one side of the upper section 5.2 of the valve cavity. A valve rod 6 is connected to the bottom of the induction diaphragm 3. The valve rod 6 passes downward through the upper section 5.2 of the valve cavity and extends into the lower section 5.1 of the valve cavity. And a valve core 7 is fixed at the bottom end of the valve rod 6 in the lower section 5.1 of the valve cavity. A spring seat 8 is arranged inside the bottom end of the lower section 5.1 of the valve cavity. Multiple through holes are provided in the spring seat 8. One end of each through hole communicates with the lower section 5.1 of the valve cavity, and the other end communicates with the outside of the valve body 1. A spring 9 is arranged between the valve core 7 and the spring seat 8. It also includes a first balance pipe 10 and a second balance pipe 11. One end of the first balance pipe 10 communicates with the upper part above the induction diaphragm 3 in the diaphragm chamber 2. The other end of the first balance pipe 10 is connected to a temperature sensing bulb 12. The temperature sensing bulb 12 is arranged on the outlet pipeline of the air conditioner evaporator. One end of the second balance pipe 11 communicates with the lower part below the induction diaphragm 3 in the diaphragm chamber 2. When the other end of the second balance pipe 11 communicates with the inside of the upper section 5.2 of the valve cavity, an internal balance type thermostatic expansion valve as shown in Figure 1 is formed. When the other end of the second balance pipe 11 communicates with the air conditioner evaporator, an external balance type thermostatic expansion valve as shown in Figure 2 is formed.

[0004] When the thermostatic expansion valve of this structure works, the medium-temperature and high-pressure liquid output by the condenser enters the lower section 5.1 of the valve cavity through the through-hole in the spring seat 8 at the bottom of the valve body 1, and then enters the upper section 5.2 of the valve cavity. When passing through the upper section 5.2 of the valve cavity, due to the throttling effect of the upper section 5.2 of the valve cavity, the liquid in the upper section 5.2 of the valve cavity is depressurized and cooled, and finally forms a low-temperature and low-pressure liquid and flows out from the upper section 5.2 of the valve cavity to the output interface end 4. During this process, the opening degree of the connection between the upper section 5.2 and the lower section 5.1 of the valve cavity is adjusted by the valve core 7 to adjust the flow rate of the refrigerant liquid entering the upper section 5.2 of the valve cavity. Specifically, taking the internal equalizing thermostatic expansion valve as an example, the temperature sensing bulb 12 connected by the first equalizing pipe 10 senses the temperature of the evaporator. When the flow rate of the refrigerant liquid entering the evaporator is small and the superheat of the evaporator is large, the temperature and pressure of the refrigerant liquid stored in the temperature sensing bulb 12 will rise. Since the temperature sensing bulb 12 is connected to the upper part above the sensing diaphragm 3 in the diaphragm chamber 2 through the first equalizing pipe 10, the pressure of the upper part above the sensing diaphragm 3 increases, and the pressure of the lower part below the sensing diaphragm 3 in the diaphragm chamber 2 is consistent with the inside of the upper section 5.2 of the valve cavity through the second equalizing pipe 11. When the pressure inside the upper section 5.2 of the valve cavity remains unchanged, the pressure difference between the upper and lower parts of the sensing diaphragm 3 increases. At this time, the downward deformation amount of the sensing diaphragm 3 increases, so that the valve core 7 moves downward through the valve rod 6, and then the opening degree of the connection between the upper section 5.2 and the lower section 5.1 of the valve cavity increases. At this time, the spring 9 is compressed, and the flow rate of the liquid entering the upper section 5.2 of the valve cavity increases, causing the pressure of the lower part below the sensing diaphragm 3 to increase. Based on the above process, balance is gradually achieved, and the adjustment of the refrigerant liquid flow rate according to the superheat of the evaporator is realized. When the superheat of the evaporator decreases, the valve core 7 and the valve rod 6 can quickly reset under the action of the spring 9, and the sensing diaphragm 3 is also reset.

[0005] The problem with the thermostatic expansion valve of this structure is that only by controlling the valve core 7 can the flow rate of the refrigerant liquid entering the upper section 5.2 of the valve cavity be adjusted. When the working environment temperature of the evaporator is relatively high, the valve core 7 needs to move downward a large distance to open the opening to a large extent in order to improve the refrigeration capacity of the evaporator and reduce the superheat of the evaporator. When the valve core 7 moves downward a large distance and maintains this state, the spring 9 is always in a greatly compressed state. After the spring 9 is in a greatly compressed state for a long time, the spring 9 will fail, and the valve core 7 cannot be reset in time during subsequent work, which will cause an excessive amount of refrigerant liquid to enter the evaporator. The excessive refrigerant liquid may return to the compressor in a liquid state without being fully heated by the evaporator, resulting in the problem of liquid hammer on the compressor. Utility Model Content

[0006] The present utility model provides a thermostatic expansion valve to solve the problem that the spring of the thermostatic expansion valve in the existing air conditioner is prone to failure, resulting in liquid hammer of the air conditioner compressor.

[0007] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0008] A thermostatic expansion valve, comprising a valve body (1), the top of the valve body (1) is a diaphragm chamber (2), there is an induction diaphragm (3) in the diaphragm chamber (2) to divide the inside of the diaphragm chamber (2) into upper and lower parts, one side of the valve body (1) is provided with an output interface end (4), the valve cavity of the valve body (1) is divided into upper and lower sections, the inside of the output interface end (4) is communicated with one side of the upper section (5.2) of the valve cavity, the inner diameter of the lower section (5.1) of the valve cavity is larger than the inner diameter of the upper section (5.2) of the valve cavity, and the bottom end of the lower section (5.1) of the valve cavity is arranged at the bottom of the valve body (1), a spring seat (8) is fixed inside the bottom end of the lower section (5.1) of the valve cavity, a plurality of through holes are provided in the spring seat (8), one end of each through hole is communicated with the lower section (5.1) of the valve cavity and the other end is communicated with the lower part of the valve body (1), a vertically arranged spring (9) is also fixed on the spring seat (8), the bottom of the induction diaphragm (3) is rotatably connected with a valve rod (6) with an axial vertical direction, the valve rod (6) extends downward through the upper section (5.2) of the valve cavity and then into the lower section (5.1) of the valve cavity, the upper end of the spring (9) is fixed with a bearing (13), and the lower end of the valve rod (6) is rotatably installed in the bearing (13);

[0009] A valve core (7) is fixedly sleeved on the part of the valve rod (6) located in the lower section (5.1) of the valve cavity, the valve core (7) is located above the bearing (13), and a plurality of vanes (14) are fixedly arranged on the circumferential side of the valve rod (6) between the valve core (7) and the bearing (13);

[0010] A pair of magnets (15) are also fixedly arranged on the circumferential side of the valve rod (6), the two magnets (15) are symmetrically distributed about the central axis of the valve rod (6), and a plurality of electromagnets (16) are arranged on the inner wall of the valve cavity of the valve body at positions corresponding to the magnets (15), and the electromagnets (16) are evenly distributed around the valve rod (6).

[0011] Further, a connecting rod (17) is vertically slidably installed at the top of the diaphragm chamber (2), the lower end of the connecting rod (17) penetrates into the diaphragm chamber (2) and is fixedly connected to the induction diaphragm (3), the upper end of the connecting rod (17) extends above the top of the diaphragm chamber (2), a first conductor (18) is installed on the part of the connecting rod (17) located above the top of the diaphragm chamber (2), the first conductor (18) extends to one side of the connecting rod (17) above the diaphragm chamber (2), a second conductor (19) is fixed at the top of the diaphragm chamber (2) at a position corresponding to the first conductor (18), a switch is formed by the first conductor (18) and the second conductor (19), and each electromagnet (16) is connected to an external power supply through the switch to form a loop.

[0012] Further, one end of the first conductor (18) is slidably mounted on the connecting rod (17). A limiting member is fixed to the upper end of the connecting rod (17), and a support spring (20) is connected between the limiting member and the first conductor (18).

[0013] In the present utility model, when the spool regulates the opening of the effective passage area at the connection between the upper section and the lower section of the valve chamber, the electromagnet is energized, which can cause the valve stem equipped with a magnet to rotate. When the valve stem rotates, the blades rotate accordingly. By the rotation of the blades, the liquid flow rate inside the lower section of the valve chamber is accelerated. In cooperation with the opening adjustment of the spool, the refrigerant liquid flow rate entering the upper section of the valve chamber can be increased. Thus, the spool only needs to appropriately control the opening and cooperate with the flow rate adjustment of the blades to significantly increase the flow rate entering the upper section of the valve chamber, avoiding excessive compression of the spring when the spool opening is increased excessively, thereby effectively extending the service life of the spring and effectively preventing the problem of liquid hammer in the air-conditioning compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of an existing internal balanced thermostatic expansion valve.

[0015] Figure 2 is a schematic structural diagram of an existing external balanced thermostatic expansion valve

[0016] Figure 3 is a schematic structural diagram of the internal balanced thermostatic expansion valve according to the embodiment of the present utility model.

[0017] Figure 4 is a state diagram when the opening of the internal balanced thermostatic expansion valve according to the embodiment of the present utility model increases.

[0018] Figure 5 is a working principle diagram of the electromagnet and the magnet according to the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0020] As Figure 3 , Figure 4 shown, this embodiment discloses a thermostatic expansion valve. Taking the internal balanced thermostatic expansion valve as an example, it includes a valve body 1, a valve stem 6, a spool 7, a first balance pipe 10, and a second balance pipe 11. The top of the valve body 1 is a diaphragm chamber 2, and an induction diaphragm 3 in the diaphragm chamber 2 divides the inside of the diaphragm chamber 2 into upper and lower parts.

[0021] On the left side of the valve body 1, there is an output interface end 4. The valve cavity of the valve body 1 is divided into an upper valve cavity section 5.2, a lower valve cavity section 5.1, and an electromagnet installation chamber located above the upper valve cavity section 5.2. The inner diameter of the lower valve cavity section 5.1 is larger than that of the upper valve cavity section 5.2. The upper valve cavity section 5.2 forms a throttling section, and the lower valve cavity section 5.1 serves as the liquid inlet section. The bottom end of the lower valve cavity section 5.1 is provided at the bottom of the valve body 1 to form an opening, and a spring seat 8 is fixed in the opening. A vertically arranged spring 9 is also fixed on the spring seat 8. The spring seat 8 is provided with a plurality of vertical liquid inlet through holes. The upper orifice of each liquid inlet through hole communicates with the lower valve cavity section 5.1, and the lower orifice of each liquid inlet through hole communicates with the lower part of the valve body 1.

[0022] The right end inside the output interface end 4 communicates with the left side of the upper valve cavity section 5.2. The left end of the output interface end 4 is connected to the input port of the evaporator of the air conditioner through a pipeline. The lower orifice of each liquid inlet through hole is connected to the output port of the condenser of the air conditioner through a pipeline. Thus, the medium-temperature and high-pressure liquid output by the condenser enters the lower valve cavity section 5.1 through the liquid inlet through holes, then enters the upper valve cavity section 5.2, and forms a low-temperature and low-pressure liquid through the throttling effect of the upper valve cavity section 5.2. The low-temperature and low-pressure liquid finally enters the evaporator of the air conditioner through the output interface end 4.

[0023] The valve rod 6 is axially vertical. The upper end of the valve rod 6 is rotatably connected to the center position at the bottom of the sensing diaphragm 3 in the diaphragm chamber 2. The lower end of the valve rod 6 sequentially passes through the electromagnet installation chamber and the upper valve cavity section 5.2 downward and then extends into the lower valve cavity section 5.1. The upper end of the spring 9 is fixed with a bearing 13, and the lower end of the valve rod 6 is rotatably installed in the bearing 13. Thus, the valve rod 6 can rotate around its own vertical central axis in the valve cavity of the valve body 1, and the valve rod 6 can move up and down under the action of the sensing diaphragm 3. When the valve rod 6 moves downward, the spring 9 is compressed through the bearing 13.

[0024] A valve core 7 is fixedly sleeved on the part of the valve rod 6 located in the lower valve cavity section 5.1. The valve core 7 is located above the bearing 13. The upper part of the valve core 7 is in the shape of a semi-circular hemisphere, and the upper part of the valve core 7 is directly opposite to the communication part between the upper valve cavity section 5.2 and the lower valve cavity section 5.1. The opening degree between the upper valve cavity section 5.2 and the lower valve cavity section 5.1 is controlled by the upper part of the valve core 7. A plurality of vanes 14 are fixedly arranged on the circumferential side surface of the valve rod 6 between the valve core 7 and the bearing 13. Thus, when the valve rod 6 rotates, the valve core 7 and the vanes 14 rotate accordingly. When the valve rod 6 moves up and down, the valve core 7 and the vanes 14 move up and down accordingly.

[0025] A pair of magnets 15 with the same size are also fixedly arranged on the circumferential side surface of the part of the valve rod 6 located in the electromagnet installation chamber. The two magnets 15 are symmetrically distributed with respect to the central axis of the valve rod 6. A plurality of electromagnets 16 are provided on the inner wall of the electromagnet installation chamber corresponding to the positions of the magnets 15. Each electromagnet 16 is evenly distributed around the valve rod 6. Specifically, as Figure 5As shown in the figure, this embodiment has three electromagnets 16, which surround the two magnets 15 on the valve stem 6. One of the two magnets has its N pole facing outwards, and the other magnet has its S pole facing outwards. The vertical heights of the respective electromagnets 16 are the same, and the vertical height of each electromagnet 16 is greater than the height of the magnet.

[0026] A connecting rod 17 is also vertically slidably installed at the top of the diaphragm chamber 2. The lower end of the connecting rod 17 penetrates into the diaphragm chamber 2 and is fixedly connected to the sensing diaphragm 3. The upper end of the connecting rod 17 extends above the top of the diaphragm chamber 2. A first conductor 18 is also provided above the top of the diaphragm chamber 2. The left end of the first conductor 18 is vertically slidably installed on the part of the connecting rod 17 above the top of the diaphragm chamber 2. The right end of the first conductor 18 extends rightwards above the top of the diaphragm chamber 2. A second conductor 19 is fixed at the top of the diaphragm chamber 2 corresponding to the position of the first conductor 18, and a switch is formed by the first conductor 18 and the second conductor 19. A limiting member is fixed at the upper end of the connecting rod 17, and a support spring 20 is connected between the limiting member and the first conductor 18. When the connecting rod 17 continuously slides downwards until the first conductor 18 contacts the second conductor 19, since the connecting rod 17 and the first conductor 18 are in relative sliding fit, the connecting rod 17 can continue to slide downwards. During this process, the limiting member presses the first conductor 18 against the second conductor 19 through the support spring 20 until the support spring 20 is compressed to the limit. As long as the total distance that the connecting rod moves downwards when the support spring 20 is compressed to the limit is equal to the maximum deformation amount of the downward deformation of the sensing diaphragm 3, it can be ensured that the connecting rod can always move up and down when the valve core 7 moves up and down. When the connecting rod 17 slides upwards, the support spring 20 gradually resets, and the first conductor 18 gradually separates from the second conductor 19.

[0027] In this embodiment, the three electromagnets 16 are all connected to an external power source and an electromagnet control circuit through a switch formed by the first conductor 18 and the second conductor 19 to form a loop. When the switch is off, the three electromagnets 16 are de-energized; when the switch is on, the energization of the three electromagnets 16 is controlled through the electromagnet control circuit.

[0028] One end of the first balance pipe 10 is communicated with the part above the sensing diaphragm 3 in the diaphragm chamber 2, and the other end of the first balance pipe 10 is connected with a temperature sensing bulb 12, and the temperature sensing bulb 12 is arranged on the outlet pipeline of the air conditioner evaporator. One end of the second balance pipe 11 is communicated with the part below the sensing diaphragm 3 in the diaphragm chamber 2, and the other end of the second balance pipe 11 is communicated with the inside of the upper section 5.2 of the valve cavity, thereby forming an internally balanced thermostatic expansion valve.

[0029] Taking an internal equalizing thermostatic expansion valve as an example, when this embodiment works normally, the temperature sensing bulb 12 senses the superheat of the evaporator. When the flow rate of the low-temperature and low-pressure refrigerant liquid entering the evaporator is small, resulting in an increase in the superheat of the evaporator, the temperature and pressure of the refrigeration liquid stored in the temperature sensing bulb 12 will rise. Then, the temperature sensing bulb 12 increases the pressure of the upper part above the sensing diaphragm 3 through the first equalizing pipe 10, and further causes the sensing diaphragm 3 to deform downward.

[0030] When the sensing diaphragm 3 deforms downward, the valve stem 6 and the connecting rod 1 both move downward. When the valve stem 6 moves downward, the valve core 7 moves downward accordingly, thereby increasing the opening degree at the connection between the upper part 5.2 and the lower part 5.1 of the valve cavity. As a result, the flow rate of the medium-temperature and high-pressure refrigerant liquid entering the upper part 5.2 of the valve cavity from the lower part 5.1 of the valve cavity increases, and when the valve core 7 moves downward, the spring 9 is compressed. The medium-temperature and high-pressure refrigerant liquid with an increased flow rate in the lower part 5.1 of the valve cavity enters the upper part 5.2 of the valve cavity, and forms a low-temperature and low-pressure refrigerant liquid flow through the throttling effect of the upper part 5.2 of the valve cavity. Thereby increasing the liquid pressure in the upper part 5.2 of the valve cavity, and finally increasing the flow rate of the low-temperature and low-pressure refrigerant liquid output to the evaporator, reducing the superheat of the evaporator. At this time, the pressure in the upper part 5.2 of the valve cavity increases, increasing the pressure of the lower part below the sensing diaphragm 3 through the second equalizing pipe 11, and the valve core 7 and the valve stem 6 quickly reset under the action of the spring 9. When the valve core 7 resets, the opening degree at the connection between the upper part 5.2 and the lower part 5.1 of the valve cavity decreases, thereby forming a new balance.

[0031] During this process, as long as the downward movement distance of the connecting rod 1 is not enough to make the first conductor 18 and the second conductor 19 contact, the switch composed of the first conductor 18 and the second conductor 19 remains disconnected. At this time, all three electromagnets 16 are not energized, and the valve stem 6 only moves in the vertical direction. Therefore, only the valve core 7 is used to adjust the opening degree at the connection between the upper part 5.2 and the lower part 5.1 of the valve cavity.

[0032] When the superheat of the evaporator is large, the downward deformation amount of the sensing diaphragm 3 increases, then the downward movement distance of the valve stem 6 driving the valve core 7 increases, the opening degree at the connection between the upper part 5.2 and the lower part 5.1 of the valve cavity increases, and the deformation amount of the corresponding spring 9 being compressed increases. At the same time, the downward movement distance of the connecting rod 1 also increases. When the connecting rod 1 moves downward to make the first conductor 18 and the second conductor 19 contact each other, the switch composed of the first conductor 18 and the second conductor 19 conducts. At this time, the three electromagnets 16 are energized under the control of the electromagnet control circuit, acting on the two magnets 15 on the valve stem 6, and then causing the two magnets 15 to rotate. Thereby the valve stem 6 rotates accordingly.

[0033] When the valve stem 6 rotates, the blade 14 on the valve stem 6 rotates accordingly, thereby accelerating the flow rate of the refrigerant liquid in the lower section 5.1 of the valve chamber. Cooperating with the valve core 7, the opening degree at the connection between the upper section 5.2 and the lower section 5.1 of the valve chamber is appropriately increased, so that the flow rate of the refrigerant liquid entering the upper section 5.2 of the valve chamber from the lower section 5.1 of the valve chamber can be rapidly increased. Therefore, in this embodiment, it is not necessary for the valve core 7 to excessively increase the opening degree to effectively increase the flow rate, thus avoiding excessive compression of the spring 9.

[0034] In this embodiment, as Figure 5 shown, the rotation structure of the electromagnet 16 and the magnet 15 is essentially the stator and rotor parts of a brushless motor. Therefore, the electromagnet control circuit is the same as the electromagnet control circuit in a brushless motor. Specifically, as Figure 5 shown, the three electromagnets 16 are connected in a star connection, and the on / off of the three electromagnets 16 in pairs is controlled by a switch tube control circuit composed of switch tubes Q1 - Q6. The external power supply supplies power to the electromagnets 16 through a switch S composed of a first conductor 18 and a second conductor 19 and the switch tube control circuit composed of switch tubes Q1 - Q6. Taking the switch tubes Q4 and Q5 as an example, when the switch S is turned on and the switch tubes Q4 and Q5 are turned on, the current direction is as Figure 5 shown by the arrow in Figure 5 . The positive current of the power supply flows through the switch tube Q5 to the Figure 5 lower right electromagnet in , and then flows from the Figure 5 lower left electromagnet to the switch tube Q4, and finally returns to the negative pole of the power supply through the switch S. At this time, the two lower electromagnets are energized. The S pole of the lower right electromagnet faces the magnet 15 on the valve stem 6, and the N pole of the lower left electromagnet faces the magnet on the valve stem 6. Since one of the two magnets 15 has its N pole facing outward and the other has its S pole facing outward, under the action of the two lower electromagnets 16, the two magnets 15 rotate, and then the valve stem 6 rotates. The above principle is the same as that of a brushless motor, and this embodiment will not be elaborated further.

[0035] It should be noted that although this embodiment is described by taking the internal balanced thermostatic expansion valve as an example, when the other end of the second balance pipe 11 is connected to the air conditioner evaporator in this embodiment, an external balanced thermostatic expansion valve can be formed. Therefore, the external balanced thermostatic expansion valve should still be regarded as falling within the protection scope of the present invention.

[0036] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. The embodiments described in the present utility model are merely descriptions of the preferred embodiments of the present utility model, and do not limit the concept and scope of the present utility model. Among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. As long as such a combination does not violate the idea of the present utility model, it should also be regarded as the content disclosed in this disclosure. To avoid unnecessary repetition, the present utility model will not separately describe various possible combination methods.

[0037] The present utility model is not limited to the specific details in the above embodiments. Within the technical concept scope of the present utility model and without departing from the design idea of the present utility model, various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should all fall within the protection scope of the present utility model. The technical content claimed by the present utility model has been fully recorded in the claims.

Claims

1. A thermal expansion valve, comprising a valve body (1), the top of the valve body (1) being a diaphragm chamber (2), the diaphragm chamber (2) being provided with a sensing diaphragm (3) for dividing the interior of the diaphragm chamber (2) into an upper part and a lower part, an output interface end (4) being provided on one side of the valve body (1), the valve cavity of the valve body (1) being divided into an upper part and a lower part, the interior of the output interface end (4) being communicated with one side of an upper part (5.2) of the valve cavity, the inner diameter of the lower part (5.1) of the valve cavity being larger than the inner diameter of the upper part (5.2) of the valve cavity, and the bottom end of the lower part (5.1) of the valve cavity being arranged at the bottom of the valve body (1), a spring seat (8) being fixed inside the bottom end of the lower part (5.1) of the valve cavity, a plurality of through holes being provided in the spring seat (8), each of the through holes having one end connected to the lower part (5.1) of the valve cavity and the other end connected to the bottom of the valve body (1), a vertically arranged spring (9) being also fixed on the spring seat (8), characterized in that: The bottom of the sensing diaphragm (3) is rotatably connected to an axially vertical valve stem (6), the valve stem (6) passes downward through the upper section (5.2) of the valve cavity and then extends into the lower section (5.1) of the valve cavity, a bearing (13) is fixed to the upper end of the spring (9), and the lower end of the valve stem (6) is rotatably mounted in the bearing (13); A valve core (7) is fixed to a portion of the valve stem (6) located in the lower section (5.1) of the valve cavity, the valve core (7) being located above the bearing (13), and a plurality of blades (14) are fixed to the circumferential side of the valve stem (6) between the valve core (7) and the bearing (13); A pair of magnets (15) are also fixed to the circumferential side of the valve stem (6), and the two magnets (15) are symmetrically distributed about the central axis of the valve stem (6). A plurality of electromagnets (16) are provided on the inner wall of the valve cavity of the valve body at positions corresponding to the magnets (15), and the electromagnets (16) are evenly distributed around the valve stem (6).

2. A thermal expansion valve according to claim 1, characterized in that: A connecting rod (17) is vertically slidably mounted on the top of the diaphragm chamber (2). The lower end of the connecting rod (17) penetrates into the diaphragm chamber (2) and is fixedly connected to the sensing diaphragm (3). The upper end of the connecting rod (17) extends above the top of the diaphragm chamber (2). A first conductor (18) is mounted on the portion of the connecting rod (17) located above the top of the diaphragm chamber (2). The first conductor (18) extends toward one side of the connecting rod (17) to the top of the diaphragm chamber (2). A second conductor (19) is fixed on the top of the diaphragm chamber (2) at a position corresponding to the first conductor (18). The first conductor (18) and the second conductor (19) form a switch. Each electromagnet (16) is connected to an external power source through the switch to form a circuit.

3. A thermal expansion valve according to claim 2, characterized in that: One end of the first conductor (18) is slidably mounted on the connecting rod (17); a limiting member is fixed to the upper end of the connecting rod (17); and a supporting spring (20) is connected between the limiting member and the first conductor (18).

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