A temperature-sensing reversing valve core assembly, a reversing valve, and a heat exchange system

Abstract

This invention provides a temperature-sensing reversing valve core assembly, a reversing valve, and a heat exchange system. The temperature-sensing reversing valve core assembly includes a valve body, a valve plug assembly, a valve stem drive mechanism, and a temperature-sensing drive assembly. The valve plug assembly includes a valve stem and a valve plug, with a return spring fitted on the valve stem between a limiting end piece at the valve body and the valve stem end. The valve stem drive mechanism includes a three-axis vertical lever, a connecting member, and a swing member, with the swing member passing through the valve seat to press or release the valve stem. The temperature-sensing drive assembly includes a first temperature-sensing expansion joint, a first temperature-sensing bulb, a second temperature-sensing expansion joint, and a second temperature-sensing bulb. The lever is pressed against the second temperature-sensing expansion joint by a tension spring. This invention eliminates electronic detection and control circuits, enabling stable operation in high-temperature, high-vibration, or corrosive media, avoiding malfunctions caused by environmental interference in traditional electronic systems. This makes it suitable for explosion-proof, passive, or extreme outdoor environments, and also avoids the problem of electronic component aging and drift.

Description

Technical Field

[0001] This invention belongs to the field of heat exchangers, specifically relating to a temperature-sensing reversing valve core assembly, a reversing valve, and a heat exchange system. Background Technology

[0002] In a solar heat exchange system, the incoming medium (hereinafter referred to as "incoming medium") in the pipes connected to the solar collector enters the user-side heat exchanger to heat the water inside. Effective heat exchange is only achieved when the temperature of the incoming fluid is higher than the water temperature in the user-side heat exchanger; otherwise, reverse heat transfer may occur, causing the water temperature in the user-side heat exchanger to drop. Traditional control schemes generally use electronic temperature sensors to monitor the temperature of the water and the incoming fluid in the user-side heat exchanger in real time. After comparing the temperature values ​​with those of the incoming fluid, the controller drives an electric or electromagnetic directional valve to control the on / off state and flow direction.

[0003] The above-mentioned electronic control method has the following drawbacks: 1. The entire system requires continuous power supply to maintain operation, which limits its applicability in environments without stable power supply or explosion-proof scenarios; 2. The reliability of the electronic system composed of temperature sensors, controllers and electric actuators drops sharply under harsh conditions such as high temperature, high humidity and vibration, which can easily lead to misjudgment or failure; 3. Electronic components have aging and drift problems, resulting in high maintenance costs. Summary of the Invention

[0004] This invention provides a temperature-sensing reversing valve core assembly, a reversing valve, and a heat exchange system, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a temperature-sensing reversing valve core assembly, comprising:

[0006] Valve housing, wherein a valve seat is provided inside the valve housing;

[0007] A valve plug assembly is provided on one side of the valve seat, including a valve stem passing through the bottom of the valve housing, an end piece fixed to the end of the valve stem, and a valve plug connected to the end of the valve stem extending out of the valve housing. A return spring is fitted on the valve stem, which is limited between the valve housing and the end piece.

[0008] A valve stem drive mechanism is located on the other side of the valve seat. It includes a lever, a connecting member, and a swing member that are rigidly connected and perpendicular to three axes. The free end of the swing member passes through the valve seat and abuts against the end piece.

[0009] A temperature-sensing drive assembly includes a first temperature-sensing expansion joint disposed above the swing member and a second temperature-sensing expansion joint disposed below the swing member. One end of each of the first and second temperature-sensing expansion joints is fixedly mounted on a valve seat, and the other ends are either hinged or abutted against the two ends of the lever. When one temperature-sensing expansion joint is hinged, the other temperature-sensing expansion joint abuts against the lever. The first temperature-sensing expansion joint is connected to a first temperature-sensing bulb via a rigid conduit, and the second temperature-sensing expansion joint is connected to a second temperature-sensing bulb via a rigid conduit. The first and second temperature-sensing expansion joints are capable of extending or retracting towards or away from the lever based on the temperature of the medium in contact with the first and second temperature-sensing bulbs, respectively.

[0010] At least two tension springs are tensioned between the two ends of the connector and the valve seat;

[0011] When the expansion amount of the first temperature-sensing expansion joint is less than the expansion amount of the second temperature-sensing expansion joint, the lever rotates clockwise, causing the swing member to press the valve plug assembly; conversely, the swing member releases the pressure, and the valve stem bounces up under the action of the return spring, causing the valve plug to move upward.

[0012] In this embodiment, firstly, the expansion force of the temperature-sensitive expansion joint is very large, similar to the phenomenon of pipe rupture caused by the expansion of volume due to freezing, which is common in nature. Secondly, in this embodiment, the filling material in the temperature-sensitive bulb and the temperature-sensitive expansion joint rigidly connected to it is a relatively temperature-sensitive material, and the expansion and contraction caused by temperature is significant. The valve stem drive mechanism can achieve self-forced control of the valve plug based on the temperature difference sensed by the first and second temperature-sensitive bulbs, eliminating the need for electronic detection and control circuits, achieving flow direction switching without external power supply, and eliminating the risk of failure of electronic components in temperature detection, signal processing, and execution. Specifically, the temperature-sensitive bulb and the temperature-sensitive expansion joint are filled with temperature-sensitive media. When the fluid temperature outside the first temperature-sensitive bulb is higher than the fluid temperature outside the second temperature-sensitive bulb, the first temperature-sensitive expansion joint expands and pushes the lever to rotate counterclockwise, thereby driving the valve stem and valve plug to move upward, realizing the movement of the valve plug, and thus controlling the fluid flow direction. By leveraging the inherent thermodynamic properties of the temperature-sensing drive components to achieve responsive operation, it can still work stably in high-temperature, high-vibration, or corrosive media, avoiding malfunctions caused by environmental interference in traditional electronic systems. This makes it suitable for explosion-proof, passive, or extreme outdoor environments, with strong adaptability and a wide range of applications. In addition, it can avoid the problem of electronic component aging and drift, significantly reducing maintenance costs and failure rates, and extending service life.

[0013] In some embodiments, the end of the first temperature-sensitive expansion joint is hinged to the upper end of the lever, and the end of the second temperature-sensitive expansion joint abuts against the lower end of the lever.

[0014] In some embodiments, the valve seat is provided with a vertical guide groove suitable for the oscillating member to pass through, the vertical guide groove forming a degree of freedom for the oscillating member; and / or

[0015] The free end of the second temperature-sensitive expansion joint is provided with a guide cone, and a guide limiting groove extending along the length direction is provided at the lower part of the lever, and the second temperature-sensitive expansion joint slides against the guide limiting groove.

[0016] In some embodiments, the length of the oscillating member is greater than the length of the lever to form an amplified structure in which the relative expansion and contraction of the first and second temperature-sensitive expansion joints is transmitted to the pressing or releasing amount of the oscillating member.

[0017] In some embodiments, expansion joint guide cylinders are provided on the outer periphery of the first and second temperature-sensitive expansion joints, respectively. One end of the expansion joint guide cylinder is fixedly assembled with the valve seat, and the other end is open to allow the first and second temperature-sensitive expansion joints to freely extend and retract along their axial direction and form support for the corresponding temperature-sensitive expansion joints.

[0018] In some embodiments, adjusting screws suitable for adjusting the first and second temperature-sensitive expansion joints are respectively mounted on the valve seat. In this embodiment, by adjusting the distance between the temperature-sensitive expansion joint and the valve seat using the screws, the balance angle of the lever can be adjusted, and the operating temperature difference of the valve plug can be adjusted according to actual needs, thus improving the versatility of the device.

[0019] In some embodiments, the volume of the first temperature-sensing bulb is larger than the volume of the first temperature-sensing expansion joint, and the volume of the second temperature-sensing bulb is larger than the volume of the second temperature-sensing expansion joint. Specifically, the volume of the temperature-sensing bulb can be 2-5 times the volume of the corresponding temperature-sensing expansion joint to increase the expansion or contraction of the temperature-sensing expansion joint when the temperature changes.

[0020] In some embodiments, the lever, the valve stem, and the oscillating member are located on the same vertical plane.

[0021] In a second aspect, the present invention also provides a reversing valve, including the temperature-sensing reversing valve core assembly and a valve passage, wherein the valve passage is fixed together with the valve housing and the valve plug extends into the valve passage;

[0022] The valve passage includes:

[0023] The first valve passage is suitable for introducing incoming medium;

[0024] A second valve passage is connected to the first valve passage. A first opening, suitable for conducting incoming medium and engaging with the valve plug, is provided between the second valve passage and the first valve passage. The second valve passage is adapted to communicate with a user-side heat exchanger.

[0025] A third valve passage is connected to the first valve passage, and a second opening is provided at the connection point. The second opening is located on the downward pressure path of the valve plug. The third valve passage is adapted to communicate with an external circulation system.

[0026] The valve plug passes through the first opening and is adapted to seal the first opening or the second opening. When the temperature of the incoming medium is lower than the water temperature inside the user-side heat exchanger, the valve plug abuts against the bottom end of the first opening under the action of the return spring, forming an end face seal, and the incoming medium enters the third valve channel for external circulation. When the temperature of the incoming medium is higher than the water temperature inside the user-side heat exchanger and the temperature difference reaches a certain threshold, the valve plug seals the second opening under the pressure of the swing member, and the incoming medium enters the second valve channel for heat exchange with the user-side heat exchanger.

[0027] Thirdly, the present invention also provides a heat exchange system including the aforementioned reversing valve.

[0028] Based on the advantage of the temperature-sensing reversing valve core assembly in self-regulating valve control, the valve assembly and heat exchange system provided by this invention can solve the defect of the sharp drop in reliability of existing valves under harsh conditions such as high temperature, high humidity, and vibration. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the heat exchange system of the present invention.

[0030] Figure 2 This is an assembly diagram of the valve stem drive mechanism and the temperature sensing drive assembly of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-First temperature-sensing expansion joint; 2-Valve housing; 3-Lever; 4-Connector; 5-First valve passage; 6-Second temperature-sensing bulb; 7-Valve plug; 8-Third valve passage; 9-Tension spring; 10-Swinging component; 11-Reset spring; 12-Valve seat; 13-Second valve passage; 14-Valve stem; 15-First temperature-sensing bulb; 16-User-side heat exchanger; 17-Second temperature-sensing expansion joint; 18-Guide limiting groove; 19-Expansion joint guide cylinder; 20-End plate. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In fluid heat exchange systems, temperature regulation is typically achieved by controlling the on / off state or flow direction of the heating medium. When the temperature of the heating medium is higher than that of the heated medium, the system can effectively transfer heat; conversely, if the temperature of the heating medium is insufficient, it may absorb heat in the opposite direction, causing the temperature of the heated medium to drop instead of rise. Existing technologies commonly employ electronic control schemes for such systems: for example, installing electronic temperature sensors on the pipeline to collect real-time temperature signals at the inlet of the heating medium and the temperature of the heated medium, and transmitting the data to a controller for comparison and calculation. The controller sends commands to electric or solenoid valves based on the comparison results, adjusting the valve's opening / closing state or switching the flow direction to achieve heat exchange control. However, the above scheme has significant limitations: First, the electronic control system relies on a continuous power supply, making it difficult to implement in scenarios without a stable power supply or explosion-proof requirements; second, complex circuits need to be laid out between the temperature sensor, controller, and electric actuator, which are prone to component aging, signal distortion, or circuit failure due to long-term exposure to high temperature, humidity, or vibration environments; third, the response accuracy of electronic devices is easily affected by ambient temperature fluctuations, requiring regular calibration and maintenance to maintain performance, leading to increased operating costs. In addition, the entire system contains multiple discrete components, which occupy a large space and are complex to install, making it unsuitable for miniaturized equipment design.

[0038] The temperature-sensing directional valve core assembly provided in this application utilizes the thermal expansion and contraction of the temperature-sensitive liquid in the temperature-sensing drive assembly to drive the valve plug actuation. It eliminates the need for temperature sensors, controllers, and power supply lines, fundamentally avoiding reliance on electronic components. This makes it particularly suitable for environments without power supply, explosion-proof environments, or complex outdoor environments. It eliminates the risk of electronic component failure in high-temperature, vibration, and corrosive media, and significantly reduces the failure rate caused by electronic component aging and signal drift. Furthermore, this solution features high integration and a compact structure, eliminating external wiring and separate controllers, simplifying the installation process and reducing the space occupied by the device.

[0039] Please refer to the attached document as well. Figure 1 and attached Figure 2 The present invention will now describe the temperature-sensing reversing valve core assembly. The temperature-sensing reversing valve core assembly includes a valve housing 2, a valve plug assembly, a valve stem drive mechanism, a temperature-sensing drive assembly, and a tension spring 9. The temperature-sensing drive assembly controls the rotation of the valve stem drive mechanism, thereby driving the valve plug 7 to move. Specifically, the valve housing 2 is provided with a valve seat 12, which is a vertically arranged plate structure that divides the valve housing 2 into two parts. The valve seat 12 is used to assemble the temperature-sensing drive assembly and the limiting valve stem drive mechanism. The valve plug assembly includes a valve stem 14 penetrating the bottom of the valve housing 2, an end piece 20 fixed to the end of the valve stem 14, and a valve plug 7 connected to the end of the valve stem 14 extending out of the valve housing. A return spring 11 is fitted on the valve stem 14, limiting its position between the valve housing 2 and the end piece 20. The return spring 11 is compressed and fixed between the valve housing 2 and the end piece 20. When the pressure on the valve stem 14 is released, the return spring 11 pushes the valve stem upward, thus lifting the valve plug.

[0040] It should be noted that, Figure 1 The front half of the valve seat was cut off. Figure 2 The rear and upper halves of the middle valve seat 12 have been cut off, revealing the unassembled first temperature-sensing expansion joint 1.

[0041] The valve stem 14 drive mechanism is located on the other side of the valve seat 12, and includes a lever 3, a connecting member 4, and a swing member 10 that are rigidly connected and perpendicular to three axes. The free end of the swing member 10 passes through the valve seat 12 and abuts against the end plate 20, meaning that the swing member 10 maintains sliding contact with the end plate 20 when pressed down. Of course, to improve contact, the contact area of ​​the end plate 20 can be increased. The lever 3, connecting member 4, and swing member 10 form a three-axis perpendicular structure, similar to the x, y, and z axes of a coordinate system. Based on this concept, those skilled in the art can design the three axes with other connection angles; as long as the lever 3 rotates based on temperature difference, thereby driving the swing member 10 to press or release the valve stem 14, all such designs are within the scope of protection of this invention.

[0042] The temperature-sensing drive assembly includes a first temperature-sensing expansion joint 1 disposed above the swing member 10 and a second temperature-sensing expansion joint 17 disposed below the swing member 10. One end of the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 are respectively fixedly mounted on the valve seat 12, and the other end is respectively hinged or abutted to the two ends of the lever 3. When one temperature-sensing expansion joint is hinged, the other temperature-sensing expansion joint abuts. The first temperature-sensing expansion joint 1 is connected to a first temperature-sensing bulb 15 through a rigid pipe, and the second temperature-sensing expansion joint 17 is connected to a second temperature-sensing bulb 6 through a rigid pipe. The first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 can extend or retract towards or away from the lever 3 based on the temperature of the medium in contact with the first temperature-sensing bulb 15 and the second temperature-sensing bulb 6, respectively. The first temperature-sensing bulb 15 is suitable for mounting in the user-side heat exchanger 16 for measuring the water temperature, and the second temperature-sensing bulb 6 is suitable for mounting in the valve passage for measuring the temperature of the incoming medium.

[0043] Tension springs 9 are arranged in pairs, with at least one pair, and are tensioned between the two ends of the connecting member 4 and the valve seat 12. The tension springs 9 are adapted to press the lever 3 against the telescopic end of the first temperature-sensitive expansion joint 1 or the second temperature-sensitive expansion joint 17. The connecting member 4 has a degree of freedom of rotation about its axial direction relative to the tension springs 9. When the first temperature-sensitive expansion joint 1 and the second temperature-sensitive expansion joint 17 telescopically or in a non-isothermal manner, the lever 3 can rotate under the constraint of the tension springs 9 based on the difference in the vertical telescopic amounts. See also Figure 1 In the figure, the valve seat 12 is cut open, with the front half cut off, revealing the tension spring 9 that is not assembled with the valve seat 12 in the front half.

[0044] In specific application scenarios, when the expansion amount of the first temperature-sensing expansion joint 1 is less than that of the second temperature-sensing expansion joint 17, the lever 3 rotates clockwise, causing the swing member 10 to press the valve plug 7 assembly. Conversely, the swing member 10 releases the pressure, and the valve stem 14 springs up under the action of the return spring 11, causing the valve plug 7 to move upward. The valve stem 14 drive mechanism utilizes the lever principle, allowing even a small deviation in the temperature-sensing expansion joint to result in a large swing displacement at the end of the swing member 10. Even a small temperature difference can trigger the valve plug 7 to move, demonstrating high mechanism sensitivity.

[0045] In practical applications, for example, when the temperature of the incoming medium is higher than the water temperature in the user-side heat exchanger 16, the expansion amount of the first temperature-sensing expansion joint 1 is less than the expansion amount of the second temperature-sensing expansion joint 17. This causes the valve plug 7 to move downwards via the valve stem drive mechanism. When a certain temperature difference is reached, the third channel begins to enter a completely closed state, allowing the incoming medium to flow into the user-side heat exchanger 16. When the temperature of the incoming medium is lower than the water temperature in the user-side heat exchanger 16, the expansion amount of the first temperature-sensing expansion joint 1 is greater than the expansion amount of the second temperature-sensing expansion joint 17. The swing member 10 lifts upwards, and the valve stem 14, under the action of the return spring 11, drives the valve plug 7 upwards, closing the valve and preventing the lower-temperature incoming medium from entering the user-side heat exchanger 16.

[0046] In this embodiment, leveraging the thermal expansion and contraction properties of the temperature-sensing expansion joint, the temperature-sensing drive component controls the movement of the valve plug 7 based on the temperature difference between the fluid medium and the heat exchange medium. This eliminates the need for electronic control and enables autonomous heat exchange control based on physical characteristics. Temperature threshold triggering and flow direction switching can be achieved without external power supply, eliminating the risk of misjudgment or failure of electronic systems in harsh environments. It also solves the problem of aging and drifting of electronic components, eliminating the need for regular calibration and maintenance, reducing later maintenance costs, and extending the equipment's lifespan. Furthermore, the temperature-sensing reversing valve core assembly provided by this solution has a compact structure and saves space.

[0047] In other embodiments, based on the aforementioned embodiments, the connector 4 is limited by adding arc-shaped limiting grooves. Specifically, a pair of arc-shaped limiting grooves are formed on the valve housing 2, and the connector 4 is slidably limited within the arc-shaped limiting grooves (not shown in this document). The arc-shaped limiting grooves are adapted to the possible sliding trajectory of the connector 4.

[0048] In some embodiments, the end of the first temperature-sensitive expansion joint 1 is hinged to the upper end of the lever 3, and the end of the second temperature-sensitive expansion joint 17 abuts against the lower end of the lever 3. This way, the rotation of the lever 3 is constrained by the tension spring 9, and the hinged upper end prevents misalignment between the temperature-sensitive expansion joint and the lever, thus preventing failure. The hinged connection between the end of the first temperature-sensitive expansion joint 1 and the upper end of the lever 3 provides greater stability.

[0049] There are several possible hinge methods. As one option, for example, a pair of first mounting plates are made on the lever 3, and a second mounting plate is provided at the end of the first temperature-sensing expansion joint 1. The first temperature-sensing expansion joint 1 is hinged to the first mounting plate through the second mounting plate, so that the lever 3 can rotate around the hinge axis.

[0050] Optionally, lever 3 can directly abut against the end of the second temperature-sensitive expansion joint 17, or it can be a restrictive abutment. For example, a guide cone is provided at the free end of the second temperature-sensitive expansion joint 17 (see...). Figure 2 The tapered structure at the end of the second temperature-sensing expansion joint 17 (not shown) has a guide limiting groove 18 extending along its length at the lower part of the lever 3. The second temperature-sensing expansion joint 17 slides against the guide limiting groove 18 and remains slidably connected along the axial direction of the lever 3.

[0051] In some embodiments, the valve seat 12 is provided with a vertical guide groove suitable for the swing member 10 to pass through, and the vertical guide groove forms the swing degree of freedom of the swing member 10.

[0052] In some embodiments, the length of the oscillating member 10 is greater than the length of the lever 3, so as to form an amplified structure in which the relative expansion and contraction of the first temperature-sensitive expansion joint 1 and the second temperature-sensitive expansion joint 17 is transmitted to the oscillating member 10 for the amount of pressing or releasing.

[0053] In this application, the temperature-sensitive expansion joint utilizes its own extensibility to adjust for the amount of expansion and contraction caused by temperature changes. When the temperature-sensing bulb rises, the temperature-sensing expansion joint (such as a metal bellows) expands and elongates; when the temperature-sensing bulb temperature decreases, the temperature-sensing expansion joint contracts. To prevent the temperature-sensing expansion joint from bending and affecting the axial expansion, expansion joint guide cylinders 19 are respectively provided on the outer periphery of the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17. One end of the expansion joint guide cylinder 19 is fixedly assembled to the valve seat 12, and the other end is open to allow the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 to freely expand and contract along their axial direction and form support for the corresponding temperature-sensing expansion joint. Preferably, the expansion joint guide cylinder 19 is welded to the valve seat 12. It should be noted that the length of the expansion joint guide cylinder 19 should be slightly greater than that of the first temperature-sensing expansion joint 1 or the second temperature-sensing expansion joint 17 to avoid the expansion joint guide cylinder 19 affecting the rotation of the lever 3.

[0054] In some embodiments, adjusting screws suitable for adjusting the first and second temperature-sensitive expansion joints are respectively mounted on the valve seat. By rotating the adjusting screws, the distance between the first or second temperature-sensitive expansion joint 17 and the valve seat is adjusted, thereby adjusting the balance angle of the lever 3. The initial position of the valve plug can also be set based on parameters such as the controlled temperature difference.

[0055] In one embodiment, the volume of the first temperature-sensing bulb 15 is larger than the volume of the first temperature-sensing expansion joint 1, and the volume of the second temperature-sensing bulb 6 is larger than the volume of the second temperature-sensing expansion joint 17. The first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 have elongated columnar structures. When the first temperature-sensing bulb 15 and the second temperature-sensing bulb 6 detect a small temperature change, the lengths of the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 can change significantly, thereby ensuring their sensitivity to temperature changes.

[0056] In a preferred embodiment, the lever 3, the valve stem 14, and the oscillating member 10 are located on the same vertical plane. Specifically, both the lever 3 and the oscillating member 10 are strip-shaped plate structures.

[0057] In one embodiment, the first temperature-sensing bulb 15, the first temperature-sensing expansion joint 1, and their connected rigid conduits, and the second temperature-sensing bulb 6, the second temperature-sensing expansion joint 17, and their connected rigid conduits are filled with a temperature-sensitive liquid. The temperature of the medium inside the heat exchanger and the temperature of the incoming medium are transferred to the temperature-sensitive liquid through the first temperature-sensing bulb 15 and the second temperature-sensing bulb 6, respectively. The thermal expansion and contraction of the temperature-sensitive liquid drives the expansion and contraction of the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17. Specifically, the first and second temperature-sensing bulbs are connected to the first and second temperature-sensing expansion joints by capillary tubes, which are made of metallic copper. The temperature-sensitive medium is preferably paraffin wax or ether. The compressive modulus of ether is typically 1 GPa (1×10⁻⁶). 9 The volume of ether is approximately 100 Pa, so it is generally considered incompressible in conventional applications. That is, the volume of a certain mass of ether at different temperatures is a specific value, and applying pressure will not cause its volume to decrease. Therefore, the ether in the first and second temperature-sensing bulbs 6 will inevitably expand in volume after being heated. Since the temperature-sensing bulbs and capillaries are both rigidly constrained fixed volumes, the expanded volume can only be accommodated by the extension of the length of the temperature-sensing expansion joint. The resulting driving force is extremely large and sufficient to overcome friction, the elastic force of the return spring 11, and the fluid pressure.

[0058] This invention provides a reversing valve, comprising the temperature-sensing reversing valve core assembly and valve passage provided in the above embodiments. The valve passage is fixed together with the valve housing 2, and the valve plug 7 extends into the valve passage. The valve passage includes a first valve passage 5, a second valve passage 13, and a third valve passage 8. The first valve passage 5 is adapted to introduce incoming medium. The second valve passage 13 is connected to the first valve passage 5, and a first opening for guiding the incoming medium is provided between the second valve passage 13 and the first valve passage 5. The second valve passage 13 is adapted to communicate with a user-side heat exchanger 16. The third valve passage 8 is connected to the first valve passage 5, and a second opening for guiding the incoming medium is provided between the third valve passage 8 and the first valve passage 5. The third valve passage 8 is adapted to communicate with an external circulation system. The first and second openings are located in the same vertical direction. Furthermore, the valve plug 7 has a cylindrical structure and is capable of moving up and down between the first and second openings. In the initial state of the valve, or when the water temperature is higher than the temperature of the incoming medium, the valve plug 7, under the action of the return spring 11, abuts against the bottom end of the first opening, forming an end-face seal. At this time, the first valve channel 5 and the second valve channel 13 are blocked, while the first valve channel 5 and the third valve channel 8 are connected, preventing the lower-temperature incoming medium from entering the user-side water heater. The incoming medium can be discharged into the external circulation system through the third valve channel 8. When the water temperature is lower than the temperature of the incoming medium and the temperature difference reaches a certain threshold, the valve plug 7 is inserted into the second opening under the pressure of the swing member 10, forming a circumferential seal. The valve plug 7 can move up and down while tightly fitting against the inner wall of the third valve channel 8. At this time, the first valve channel 5 and the third valve channel 8 are blocked, while the first valve channel 5 and the second valve channel 13 are connected, allowing the incoming medium to enter the user-side water heater. Specifically, the aforementioned temperature difference threshold is 5°, meaning that when the temperature of the incoming medium is 5° higher than the water temperature, the second opening can be sealed.

[0059] When the incoming flow temperature is higher than the water temperature of the user-side heat exchanger 16, the valve plug 7 is driven down by the valve stem 14 driving mechanism until the second opening is closed. At this time, the first valve passage 5 and the second valve passage 13 are connected, and the incoming flow medium can enter the user-side heat exchanger 16.

[0060] When the temperature of the incoming medium is lower than the water temperature of the user-side heat exchanger 16, the valve plug 7 moves upward under the action of the return spring 11, thereby closing the first opening, closing the second valve passage 13, and connecting the first valve passage 5 with the third valve passage 8, so that the incoming medium can be introduced into the external circulation system, such as returning to the solar collector for heating of the incoming medium.

[0061] In actual operation, assuming the temperature inside the user-side heat exchanger 16 is set at 45°C, the temperature of the incoming medium in the first valve channel 5 gradually increases to 50°C. At this time, the length of the first temperature-sensing expansion joint 1 remains unchanged, while the second temperature-sensing expansion joint 17 gradually extends. The lever 3, using its hinge point with the first temperature-sensing expansion joint 1 as a fulcrum, rotates clockwise until the second temperature-sensing expansion joint 17 is fully extended. When the temperature of the incoming medium stabilizes at 50°C, the difference between it and the internal temperature of the user-side heat exchanger 16 is 5°C. The expansion difference ΔL between the first temperature-sensing expansion joint 1 and the second temperature-sensing expansion joint 17 can be calculated using the following formula:

[0062] ①

[0063] Among them, △ This represents the expansion elongation of the first temperature-sensitive expansion joint 1. △ γ represents the expansion elongation of the second temperature-sensitive expansion joint 17. γ is the volume expansion coefficient of the filling material inside the temperature-sensitive expansion joint. Let be the cross-sectional area of ​​the first temperature-sensitive expansion joint 1. This is the cross-sectional area of ​​the second temperature-sensitive expansion joint 17. The cross-sectional area of ​​the first temperature sensing element 15. This is the cross-sectional area of ​​the second temperature sensing element 6. The length of the first temperature sensing bag is 15. The length of the second temperature sensing bag 6.

[0064] in, = , = , = Substituting into formula ① and simplifying, we get:

[0065] ②

[0066] In this embodiment, if the first temperature sensing bulb 15 and the second temperature sensing bulb 6 are both cylinders with dimensions of 10mm (diameter) x 100mm (length), and the first temperature sensing expansion joint 1 and the second temperature sensing expansion joint 17 are both cylinders with a diameter of 8mm and a length that can be extended or retracted, substituting the above data into formula ②, we can calculate ΔL = 1.29mm.

[0067] The distance between the contact points of the second temperature-sensing expansion joint 17 and the first temperature-sensing expansion joint 1 and the lever 3 is 30mm, and the length of the swing member 10 is 50mm. According to trigonometric calculations, the displacement of the valve stem 14 when pressed down is 2.15mm.

[0068] On the other hand, the present invention provides a heat exchange system including the reversing valve provided in the above embodiments.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature-sensing directional valve core assembly, characterized in that, include: Valve housing, wherein a valve seat is provided inside the valve housing; A valve plug assembly is provided on one side of the valve seat, including a valve stem passing through the bottom of the valve housing, an end piece fixed to the end of the valve stem, and a valve plug connected to the end of the valve stem extending out of the valve housing. A return spring is fitted on the valve stem, which is limited between the valve housing and the end piece. A valve stem drive mechanism is located on the other side of the valve seat. It includes a lever, a connecting member, and a swing member that are rigidly connected and perpendicular to three axes. The free end of the swing member passes through the valve seat and abuts against the end piece. The temperature-sensing drive assembly includes a first temperature-sensing expansion joint disposed above the swing member and a second temperature-sensing expansion joint disposed below the swing member. One end of the first and second temperature-sensing expansion joints are respectively fixedly mounted on the valve seat, and the other ends are respectively hinged or abutted to the two ends of the lever. When one temperature-sensing expansion joint is hinged, the other temperature-sensing expansion joint abuts. The first temperature-sensing expansion joint is connected to a first temperature-sensing bulb through a rigid pipe, and the second temperature-sensing expansion joint is connected to a second temperature-sensing bulb through a rigid pipe. The first and second temperature-sensing expansion joints can extend or retract in the direction closer to or farther from the lever based on the temperature of the medium in contact with the first and second temperature-sensing bulbs, respectively. as well as At least two tension springs are tensioned between the two ends of the connector and the valve seat; When the expansion amount of the first temperature-sensing expansion joint is less than the expansion amount of the second temperature-sensing expansion joint, the lever rotates clockwise, causing the swing member to press the valve plug assembly; conversely, the swing member releases the pressure, and the valve stem bounces up under the action of the return spring, causing the valve plug to move upward.

2. The temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, The end of the first temperature-sensitive expansion joint is hinged to the upper end of the lever, and the end of the second temperature-sensitive expansion joint abuts against the lower end of the lever.

3. The temperature-sensing reversing valve core assembly as described in claim 2, characterized in that, The valve seat is provided with a vertical guide groove suitable for the passage of the swinging member, the vertical guide groove forming a degree of freedom for the swinging member; and / or The free end of the second temperature-sensitive expansion joint is provided with a guide cone, and a guide limiting groove extending along its length is provided at the lower part of the lever, and the second temperature-sensitive expansion joint slides against the guide limiting groove.

4. The temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, The length of the swing member is greater than the length of the lever, so as to form an amplified structure in which the relative expansion and contraction of the first and second temperature-sensitive expansion joints is transmitted to the pressing or releasing amount of the swing member.

5. A temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, Expansion joint guide cylinders are respectively provided on the outer periphery of the first and second temperature-sensitive expansion joints. One end of the expansion joint guide cylinder is fixedly assembled with the valve seat, and the other end is open to allow the first and second temperature-sensitive expansion joints to freely expand and contract along their axial direction and form support for the corresponding temperature-sensitive expansion joints.

6. The temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, Adjusting screws suitable for adjusting the first and second temperature-sensitive expansion joints are respectively mounted on the valve seat.

7. The temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, The volume of the first temperature-sensing bulb is greater than the volume of the first temperature-sensing expansion joint, and the volume of the second temperature-sensing bulb is greater than the volume of the second temperature-sensing expansion joint.

8. The temperature-sensing reversing valve core assembly as described in claim 1, characterized in that, The lever, the valve stem, and the swing element are located on the same vertical plane.

9. A reversing valve, characterized in that, include: The temperature-sensing reversing valve core assembly and valve passage as described in any one of claims 1-8, wherein the valve passage is fixed together with the valve housing and the valve plug extends into the valve passage; The valve passage includes: The first valve passage is suitable for introducing incoming medium; A second valve passage is connected to the first valve passage. A first opening, suitable for conducting incoming medium and engaging with the valve plug, is provided between the second valve passage and the first valve passage. The second valve passage is adapted to communicate with a user-side heat exchanger. A third valve passage is connected to the first valve passage, and a second opening is provided at the connection point. The second opening is located on the downward pressure path of the valve plug. The third valve passage is adapted to communicate with an external circulation system. The valve plug passes through the first opening and is adapted to seal the first opening or the second opening. When the temperature of the incoming medium is lower than the water temperature inside the user-side heat exchanger, the valve plug abuts against the bottom end of the first opening under the action of the return spring, forming an end face seal, and the incoming medium enters the third valve channel for external circulation. When the temperature of the incoming medium is higher than the water temperature inside the user-side heat exchanger and the temperature difference reaches a certain threshold, the valve plug seals the second opening under the pressure of the swing member, and the incoming medium enters the second valve channel for heat exchange with the user-side heat exchanger.

10. A heat exchange system, characterized in that, Including the reversing valve as described in claim 9.

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