Ball valve

Abstract

The invention relates to the technical field of valves, in particular to a ball valve which comprises a valve seat, an opening and closing part, a valve rod, a first memory alloy part, a second memory alloy part and a power supply device, the valve seat is provided with a valve cavity, a first circulation opening and a second circulation opening, the first circulation opening and the second circulation opening communicate with the valve cavity, the opening and closing part is installed in the valve cavity, and one end of the valve rod is connected with the opening and closing part; the first memory alloy part and the second memory alloy part are connected with the other end of the valve rod through a transmission mechanism; the power supply device and the first memory alloy part can form a first circuit loop, so that the transmission mechanism drives the valve rod to rotate in the first direction, and the communication cavity of the opening and closing part communicates with the first circulation opening and the second circulation opening. The power supply device can further form a second circuit loop with the second memory alloy part, so that the transmission mechanism drives the valve rod to rotate in the second direction, and the communication cavity of the opening and closing part is separated from the first circulation opening and the second circulation opening. The whole process does not need to be driven by a motor, and noise is low in the operation process.

Description

Technical Field

[0001] The present disclosure relates to the field of valve technology, and in particular to a ball valve. Background Art

[0002] In the related art, electric ball valves are driven by motors to control the opening and closing of the ball valves. Such ball valves have a relatively complex structure and produce relatively high noise during operation. Summary of the invention

[0003] The purpose of the present disclosure is to provide a ball valve to simplify the structure of the ball valve and reduce noise during operation.

[0004] Based on the above purpose, the present disclosure provides a ball valve, including a valve seat, an opening and closing member, a valve stem, a first memory alloy member, a second memory alloy member and a power supply device, wherein the valve seat has a valve cavity and a first flow port and a second flow port communicated with the valve cavity, the opening and closing member is installed in the valve cavity, one end of the valve stem is connected to the opening and closing member, and the first memory alloy member and the second memory alloy member are both connected to the other end of the valve stem through a transmission mechanism;

[0005] The power supply device can form a first circuit loop with the first memory alloy component, so that the transmission mechanism drives the valve stem to rotate in a first direction, and the connecting cavity of the opening and closing component is connected with the first flow port and the second flow port; the power supply device can also form a second circuit loop with the second memory alloy component, so that the transmission mechanism drives the valve stem to rotate in a second direction, and the connecting cavity of the opening and closing component is isolated from the first flow port and the second flow port, wherein the second direction is opposite to the first direction.

[0006] In one embodiment of the present disclosure, the transmission mechanism includes a gear and a rack; the gear is connected to the valve stem, the rack is meshed with the gear, one end of the first memory alloy part is fixedly connected to one end of the rack, the other end of the first memory alloy part is fixedly connected to the valve seat, one end of the second memory alloy part is fixedly connected to the other end of the rack, and the other end of the second memory alloy part is fixedly connected to the valve seat.

[0007] In one embodiment of the present disclosure, at least one of the first memory alloy component and the second memory alloy component is a wound reed, an outer end of the wound reed is fixedly connected to the rack, and an inner end of the wound reed is fixedly connected to the valve seat via a central fixed shaft.

[0008] In one embodiment of the present disclosure, at least one of the first memory alloy component and the second memory alloy component is a straight plate-shaped spring, one end of the straight plate-shaped spring is fixedly connected to the rack, and the other end of the straight plate-shaped spring is fixedly connected to the valve seat.

[0009] In one embodiment of the present disclosure, the valve stem includes a first sub-valve stem and a second sub-valve stem connected to each other, one end of the first sub-valve stem away from the second sub-valve stem is connected to the opening and closing member, and the gear is installed between the first sub-valve stem and the second sub-valve stem.

[0010] In one embodiment of the present disclosure, the ball valve further includes a limiter connected to the valve stem; the valve seat is provided with a stopper, and the limiter can abut against the stopper to limit the rotation angle of the valve stem.

[0011] In one embodiment of the present disclosure, the limiting member is a plate-shaped structure, and the limiting member is provided with a mounting hole, and the mounting hole cooperates with the valve stem through a circumferential limiting structure to limit the circumferential rotation of the limiting member relative to the valve stem;

[0012] The stop portion has a first stop surface and a second stop surface, the limit member has an arc-shaped protrusion, the arc-shaped protrusion has a first end and a second end, the end surface of the first end is configured to abut against the first stop surface when the valve stem rotates along the first direction; the end surface of the second end is configured to abut against the second stop surface when the valve stem rotates along the second direction.

[0013] In one embodiment of the present disclosure, the ball valve further includes a switch device, and the switch device is used to make the power supply device and the first memory alloy component form the first circuit loop, or make the power supply device and the second memory alloy component form the second circuit loop.

[0014] In one embodiment of the present disclosure, the ball valve further includes a sealing cover connected to the valve seat, a side of the sealing cover close to the valve seat is provided with a receiving space, and the first memory alloy component and the second memory alloy component are both located in the receiving space.

[0015] In one embodiment of the present disclosure, the switch device includes a first operating portion and a second operating portion, and the first operating portion and the second operating portion are both located outside the cover;

[0016] The first operating part is electrically connected to one end of the first memory alloy component so that the power supply device and the first memory alloy component form the first circuit loop; or the second operating part is electrically connected to one end of the second memory alloy component so that the power supply device and the second memory alloy component form the second circuit loop.

[0017] In one embodiment of the present disclosure, one end of the valve stem away from the opening and closing member is located outside the valve seat to form a manual operation end.

[0018] The beneficial effects of the present disclosure are mainly:

[0019] The ball valve provided in the present disclosure includes a valve seat, an opening and closing member, a valve stem, a first memory alloy member, a second memory alloy member and a power supply device, wherein the valve seat has a valve cavity and a first flow port and a second flow port connected to the valve cavity, the opening and closing member is installed in the valve cavity, one end of the valve stem is connected to the opening and closing member, and the first memory alloy member and the second memory alloy member are both connected to the other end of the valve stem through a transmission mechanism; the power supply device can form a first circuit loop with the first memory alloy member, so that the transmission mechanism drives the valve stem to rotate in a first direction, and connects the connecting cavity of the opening and closing member with the first flow port and the second flow port; the power supply device can also form a second circuit loop with the second memory alloy member, so that the transmission mechanism drives the valve stem to rotate in a second direction, and isolates the connecting cavity of the opening and closing member from the first flow port and the second flow port, wherein the second direction is opposite to the first direction.

[0020] Based on this structure, the ball valve provided by the present invention utilizes the thermal contraction characteristics of the first memory alloy component and the second memory alloy component to drive the valve stem to rotate in the first direction or the second direction to achieve the opening or closing of the ball valve. The entire process does not require motor drive, the overall structure is relatively simple, and the noise is low during operation.

[0021] When the ball valve needs to be opened, the power supply device and the first memory alloy component form a first circuit loop, and utilize the thermal effect of electric current. When the current passes through the first memory alloy component, the current does work and generates heat, so that the temperature of the first memory alloy component increases and the first memory alloy component contracts, so that the transmission mechanism drives the valve stem to rotate in the first direction, and the connecting cavity of the opening and closing component is connected with the first flow port and the second flow port, thereby realizing the opening of the ball valve.

[0022] When the ball valve needs to be closed, the power supply device and the second memory alloy component form a second circuit loop, and utilize the thermal effect of electric current. When the current passes through the second memory alloy component, the current does work and generates heat, so that the temperature of the second memory alloy component increases and the second memory alloy component contracts, so that the transmission mechanism drives the valve stem to rotate in a second direction, which is opposite to the first direction, and separates the connecting cavity of the opening and closing component from the first flow port and the second flow port, thereby achieving the closing of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a ball valve provided in an embodiment of the present disclosure;

[0025] Figure 2 A front view of a ball valve provided in an embodiment of the present disclosure;

[0026] Figure 3 for Figure 2 A cross-sectional view along line BB;

[0027] Figure 4 for Figure 3 A partial enlarged view of point C in the middle;

[0028] Figure 5 A schematic diagram of a portion of the internal structure of a ball valve in an open state provided by an embodiment of the present disclosure;

[0029] Figure 6 A top view of a ball valve in an open state provided by an embodiment of the present disclosure;

[0030] Figure 7 is another structural schematic diagram of the first memory alloy component and the second memory alloy component in the embodiment of the present disclosure;

[0031] Figure 8 A schematic diagram of a ball valve in a closed state provided by an embodiment of the present disclosure;

[0032] Fig. 9 A schematic diagram of a portion of the internal structure of a ball valve in a closed state provided by an embodiment of the present disclosure;

[0033] Fig.10 A top view of a ball valve in a closed state provided by an embodiment of the present disclosure;

[0034] Fig.11A circuit diagram of a ball valve provided in an embodiment of the present disclosure.

[0035] The following are the descriptions of the reference numerals:

[0036] 10-valve seat; 11-first flow port; 12-second flow port; 13-stopper; 131-first stopper surface; 132-second stopper surface; 14-threaded interface; 20-opening and closing member; 21-connecting cavity; 22-limiting groove; 221-straight groove wall; 30-valve stem; 31-first sub-valve stem; 311-installation shaft; 312-flat rod; 3121-limiting surface; 32-second sub-valve stem; 321-limiting member; 3 211-arc-shaped protrusion; 3211a-first end; 3211b-second end; 40a-first memory alloy member; 40b-second memory alloy member; 51-power supply device; 52-switch device; 521-first operating part; 522-second operating part; 53-first wire; 54-second wire; 61-gear; 62-rack; 70-cover; 80-protective cap; 91-first connecting pipe; 92-second connecting pipe. DETAILED DESCRIPTION

[0037] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0038] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0040] See also Figures 1 to 11 As shown, the present embodiment provides a ball valve, including a valve seat 10, an opening and closing member 20, a valve stem 30, a first memory alloy member 40a, a second memory alloy member 40b and a power supply device 51, the valve seat 10 has a valve cavity and a first flow port 11 and a second flow port 12 connected to the valve cavity, the opening and closing member 20 is installed in the valve cavity, one end of the valve stem 30 is connected to the opening and closing member 20, and the first memory alloy member 40a and the second memory alloy member 40b are both connected to the other end of the valve stem 30 through a transmission mechanism; the power supply device 51 can form a first circuit loop with the first memory alloy member 40a, so that the transmission mechanism drives the valve stem 30 to rotate in a first direction, and the connecting cavity 21 of the opening and closing member 20 is connected to the first flow port 11 and the second flow port 12; the power supply device 51 can also form a second circuit loop with the second memory alloy member 40b, so that the transmission mechanism drives the valve stem 30 to rotate in a second direction, and the connecting cavity 21 of the opening and closing member 20 is isolated from the first flow port 11 and the second flow port 12, wherein the second direction is opposite to the first direction.

[0041] Based on this structure, the ball valve provided in this embodiment utilizes the thermal contraction characteristics of the first memory alloy component 40a and the second memory alloy component 40b to drive the valve stem 30 to rotate in the first direction or the second direction to achieve the opening or closing of the ball valve. The entire process does not require motor drive, the overall structure is relatively simple, and the noise is low during operation.

[0042] When the ball valve needs to be opened, the power supply device 51 and the first memory alloy component 40a form a first circuit loop, and utilize the thermal effect of the current. When the current passes through the first memory alloy component 40a, the current does work and generates heat, so that the temperature of the first memory alloy component 40a increases, and the first memory alloy component 40a contracts, so that the transmission mechanism drives the valve stem 30 to rotate in the first direction, and the connecting cavity 21 of the opening and closing component 20 is connected with the first flow port 11 and the second flow port 12, so as to realize the opening of the ball valve.

[0043] When the ball valve needs to be closed, the power supply device 51 and the second memory alloy component 40b form a second circuit loop, and utilize the thermal effect of the current. When the current passes through the second memory alloy component 40b, the current does work and generates heat, so that the temperature of the second memory alloy component 40b increases, and the second memory alloy component 40b contracts, so that the transmission mechanism drives the valve stem 30 to rotate in a second direction, which is opposite to the first direction, and separates the connecting cavity 21 of the opening and closing component 20 from the first flow port 11 and the second flow port 12, thereby achieving the closing of the ball valve.

[0044] When in use, the first flow port 11 is used to connect to the first connecting pipe 91 , and the second flow port 12 is used to connect to the second connecting pipe 92 . One of the first flow port 11 and the second flow port 12 is a fluid inlet, and the other is a fluid outlet.

[0045] Illustratively, in this embodiment, the power supply device 51 may be a battery, such as a button battery.

[0046] In one embodiment, the ball valve further includes a switch device 52, and the switch device 52 is used to enable the power supply device 51 and the first memory alloy member 40a to form a first circuit loop, or to enable the power supply device 51 and the second memory alloy member 40b to form a second circuit loop.

[0047] For example, the switch device 52 may be a single-pole double-throw switch. Fig.11 As shown, when the switch device 52 is connected to one end of the first memory alloy member 40a, the current flows from the positive electrode of the power supply device 51 through the first memory alloy member 40a and then returns to the negative electrode of the power supply device 51, forming a first circuit loop.

[0048] When the switch device 52 is connected to one end of the second memory alloy member 40 b , the current flows from the positive electrode of the power supply device 51 through the second memory alloy member 40 b and then returns to the negative electrode of the power supply device 51 , forming a second circuit loop.

[0049] In one embodiment, the ball valve also includes a temperature sensor and a controller. When the switch device 52 is connected to one end of the first memory alloy component 40a, a first circuit loop is formed, and the temperature of the first memory alloy component 40a rises. When the temperature sensor detects that the temperature reaches the phase change temperature of the first memory alloy, a signal is sent to the controller, and the controller controls the switch device 52 to disconnect. At this time, the first circuit loop is disconnected.

[0050] By setting up the controller, the hardware foundation can be laid for subsequent access to the Internet of Things.

[0051] Exemplarily, the controller may be an MCU controller. For example, the controller may be a 51 series single-chip microcomputer.

[0052] It should be noted that the switch device 52 may also be other types of switches as long as it can realize the function of making the power supply device 51 and the first memory alloy component 40a form a first circuit loop, or making the power supply device 51 and the second memory alloy component 40b form a second circuit loop.

[0053] In one embodiment, see Figure 3 and Figure 5 As shown, the transmission mechanism includes a gear 61 and a rack 62; the gear 61 is connected to the valve stem 30, the rack 62 is meshed with the gear 61, one end of the first memory alloy component 40a is fixedly connected to one end of the rack 62, the other end of the first memory alloy component 40a is fixedly connected to the valve seat 10, one end of the second memory alloy component 40b is fixedly connected to the other end of the rack 62, and the other end of the second memory alloy component 40b is fixedly connected to the valve seat 10.

[0054] Exemplarily, both ends of the rack 62 are provided with grooves. Taking the connection between the first memory alloy member 40a and the rack 62 as an example, one end of the first memory alloy member 40a is inserted into the groove, and one end of the first memory alloy member 40a and the groove can be tightly matched. In order to prevent one end of the first memory alloy member 40a from being separated from the groove, the groove can be a dovetail groove, and protrusions are provided on both sides of one end of the first memory alloy member 40a. When one end of the first memory alloy member 40a is inserted into the dovetail groove from one end of the dovetail groove, when the first memory alloy member 40a contracts, it will not fall out of the dovetail groove, thereby driving the rack 62 to move, and then driving the gear 61 and the valve stem 30 to rotate along the first direction, so as to realize the opening of the ball valve.

[0055] It should be understood that the transmission mechanism using the gear 61 and the rack 62 can further simplify the structure and reduce the product's external dimensions. Of course, the transmission mechanism is not limited to the gear rack transmission mechanism.

[0056] In one embodiment, see Figure 3 As shown, the valve stem 30 includes a first sub-valve stem 31 and a second sub-valve stem 32 connected to each other, one end of the first sub-valve stem 31 away from the second sub-valve stem 32 is connected to the opening and closing member 20, and the gear 61 is installed between the first sub-valve stem 31 and the second sub-valve stem 32.

[0057] See also Figure 3 As shown, a mounting shaft 311 is provided at one end of the first sub-valve stem 31, and the gear 61 is sleeved on the mounting shaft 311. For example, the cross-section of the mounting shaft 311 may be in the shape of an oblong, and the center hole of the gear 61 is adapted to the cross-section of the mounting shaft 311. Of course, the mounting shaft 311 and the gear 61 may also be matched by a key and a keyway. A blind hole is provided on the second sub-valve stem 32, and the shape of the blind hole is adapted to the cross-section of the mounting shaft 311. The mounting shaft 311 is limited in the blind hole, and the gear 61 is located between the second sub-valve stem 32 and the first sub-valve stem 31, so as to ensure that the gear 61 drives the second sub-valve stem 32 to rotate together with the first sub-valve stem 31.

[0058] For example, see Figure 4As shown, the other end of the first sub-valve stem 31 is formed with a flat rod portion 312, and the flat rod portion 312 has two opposite limiting surfaces 3121, and the end surface of the free end of the flat rod portion 312 is an arc surface; the opening and closing member 20 is in the shape of a hollow sphere, and the connecting cavity 21 of the opening and closing member 20 radially penetrates the two ends of the hollow sphere. The circumferential surface of the opening and closing member 20 is provided with a limiting groove 22, and the shape of the cross section of the limiting groove 22 is adapted to the shape of the cross section of the flat rod portion 312, and the groove bottom of the limiting groove 22 is an arc surface adapted to the end surface of the free end of the flat rod portion 312. Exemplarily, the limiting groove 22 has two parallel straight groove walls 221, and the flat rod portion 312 is located in the limiting groove 22, and the two limiting surfaces 3121 of the flat rod portion 312 are respectively in contact with the straight groove walls 221 close to it, so as to ensure that the opening and closing member 20 can rotate with the first sub-valve stem 31.

[0059] It should be noted that the valve stem may also be an integrally formed structure.

[0060] In one embodiment, the circumferential surfaces of the first sub-valve stem 31 and the second sub-valve stem 32 are both provided with sealing grooves, and sealing members (not shown in the figure) are provided in the sealing grooves for forming a seal with the valve seat 10 .

[0061] In one embodiment, one end of the valve stem 30 away from the opening and closing member 20 is located outside the valve seat 10 to form a manual operation end.

[0062] Exemplarily, one end of the second sub-valve stem 32 away from the first sub-valve stem 31 is located outside the valve seat 10 to form a manual operation end. When the power supply device 51 fails to work, the first memory alloy member 40a and the second memory alloy member 40b are both in a relaxed state, and the manual operation end can be manually rotated to open and close the ball valve.

[0063] In one embodiment, at least one of the first memory alloy member 40a and the second memory alloy member 40b is a wound reed, the outer end of which is fixedly connected to the rack 62, and the inner end of which is fixedly connected to the valve seat 10 via a central fixed axis.

[0064] For example, see Figure 5 As shown, the first memory alloy member 40a and the second memory alloy member 40b are both wound spring sheets.

[0065] The technical solution of this embodiment is described in detail below by taking the first memory alloy member 40a as a wound spring leaf as an example.

[0066] The central fixed shaft is made of insulating material and is fixedly mounted on the valve seat 10. The inner end of the wound reed is fixedly connected to the central fixed shaft. When the wound reed shrinks due to heat, it can shrink with the central fixed shaft as a fixed point. During the shrinking process, Figure 5 and Figure 6 As shown, the outer end of the wound reed drives the rack 62 to move along the arrow direction M, thereby driving the gear 61 and the valve stem 30 to rotate along the first direction (indicated by the arrow direction A). Exemplarily, the first direction is clockwise and the second direction is counterclockwise.

[0067] See also Figure 5 and Fig.11 As shown, the ball valve further includes a total loop line, which is wrapped in an insulating tube, and the total loop line connects the positive electrode of the power supply device 51, the switch device 52, the first memory alloy member 40a or the second memory alloy member 40b, and the negative electrode. Exemplarily, one end of the total loop line is connected to the positive electrode of the power supply device 51, and then connected to the inner end of the winding spring through the switch device 52, wherein the end of the first memory alloy member 40a connected to the rack 62 is connected to the total loop line through the first wire 53, and the end of the second memory alloy member 40b connected to the rack 62 is connected to the total loop line through the second wire 54.

[0068] In other embodiments, at least one of the first memory alloy member 40a and the second memory alloy member 40b is a straight plate-shaped spring, one end of which is fixedly connected to the rack 62, and the other end of which is fixedly connected to the valve seat 10. The straight plate-shaped spring and the valve seat 10 are insulated.

[0069] For example, see Figure 7 As shown, the first memory alloy member 40a and the second memory alloy member 40b are both straight plate-shaped spring leaves.

[0070] The technical solution of this embodiment is described in detail below by taking the first memory alloy member 40a being a straight plate-shaped spring leaf as an example.

[0071] During the process of heat shrinkage, the straight plate-shaped spring can drive the rack 62 to move along the arrow direction M, thereby driving the gear 61 to rotate along the arrow direction A.

[0072] It should be noted that the structures of the first memory alloy component 40a and the second memory alloy component 40b may also be different.

[0073] Exemplarily, the materials of the first memory alloy component 40a and the second memory alloy component 40b can both be nickel-titanium based memory alloy.

[0074] It should be noted that the material of the first memory alloy component 40a and the second memory alloy component 40b may also be a copper-based memory alloy, an iron-based memory alloy, or the like.

[0075] By selecting the first memory alloy member 40 a and the second memory alloy member 40 b and using a spring with a fixed memory contraction ratio, the contraction ratio is kept fixed, thereby ensuring the rotation angle of the opening and closing member 20 .

[0076] It should be understood that in order to increase the response speed, a memory alloy with a lower phase transition temperature may be selected.

[0077] In one embodiment, the ball valve further includes a limiter 321 , which is connected to the valve stem 30 ; the valve seat 10 is provided with a stopper 13 , and the limiter 321 can abut against the stopper 13 to limit the rotation angle of the valve stem 30 .

[0078] For example, see Figure 3 and Figure 6 As shown, the valve seat 10 is also provided with a threaded interface 14, and the stopper 13 is provided on the end surface of the threaded interface 14. By the stopper 321 abutting against the stopper 13, the rotation angle of the valve stem 30 can be limited to prevent the opening and closing member 20 from excessively rotating, thereby realizing the opening and closing of the ball valve.

[0079] In one embodiment, see Figure 6 As shown, the limit member 321 is a plate-like structure, and the limit member 321 is provided with a mounting hole. The mounting hole cooperates with the valve stem 30 through a circumferential limiting structure to limit the rotation of the limit member 321 relative to the valve stem 30; the stop portion 13 has a first stop surface 131 and a second stop surface 132, and the limit member 321 has an arc-shaped protrusion 3211, and the arc-shaped protrusion 3211 has a first end 3211a and a second end 3211b, and the end surface of the first end 3211a is configured to be able to abut against the first stop surface 131 when the valve stem 30 rotates along the first direction; the end surface of the second end 3211b is configured to be able to abut against the second stop surface 132 when the valve stem 30 rotates along the second direction.

[0080] Exemplarily, the circumferential limiting structure is disposed at one end of the second sub-valve stem 32 located outside the valve seat 10, for example, the circumferential limiting structure is two parallel and oppositely disposed limiting planes. The mounting hole has two parallel and oppositely disposed hole walls, and the hole walls are adapted to the limiting planes, so that the limiting member 321 rotates together with the valve stem 30.

[0081] Exemplarily, the stopper 13 is an arc-shaped rod, and the arc-shaped rod is integrally formed with the valve seat 10. Of course, the arc-shaped rod can also be welded to the valve seat 10. Figure 6 As shown, when the valve stem 30 rotates along the first direction until the end surface of the first end 3211a abuts against the first stop surface 131, the ball valve is in a fully open state; see Fig.10 As shown, when the valve stem 30 rotates along the second direction until the end surface of the second end 3211b abuts against the second stop surface 132, the ball valve is in a closed state.

[0082] It should be noted that if the ball valve is to be partially opened, the degree of contraction of the first memory alloy spring and the second memory alloy spring can be changed by controlling the temperature, thereby controlling the rotation angle of the opening and closing member 20.

[0083] In one embodiment, see Figure 1 As shown, the ball valve further includes a cover 70, which is connected to the valve seat 10. For example, the cover 70 is fixedly connected to the valve seat 10 by fastening bolts. A receiving space is provided on one side of the cover 70 close to the valve seat 10, and the first memory alloy member 40a and the second memory alloy member 40b are located in the receiving space. In this way, the first memory alloy member 40a and the second memory alloy member 40b can be protected.

[0084] See also Figure 1 As shown, the switch device includes a first operating portion 521 and a second operating portion 522, and the first operating portion 521 and the second operating portion 522 are both located outside the cover.

[0085] Illustratively, an opening is provided on the cover 70 to expose the first operating portion 521 and the second operating portion 522 of the switch device 52 for easy operation.

[0086] Exemplarily, the first operating part 521 and the second operating part 522 may be buttons. When the first operating part 521 is pressed, the switch device is electrically connected to one end of the first memory alloy component, and the current flows from the positive electrode of the power supply device 51 through the first memory alloy component 40a and then returns to the negative electrode of the power supply device 51, forming a first circuit loop. The temperature of the first memory alloy component 40a rises, and when the temperature sensor detects that the temperature reaches the phase transition temperature of the first memory alloy, a signal is sent to the controller, and the controller controls the first operating part 521 to pop up, at which time the first circuit loop is disconnected.

[0087] When the second operating part 522 is pressed, the switch device is electrically connected to one end of the second memory alloy, and the current flows from the positive electrode of the power supply device 51 through the second memory alloy 40b and then returns to the negative electrode of the power supply device 51, forming a second circuit loop. The temperature of the second memory alloy 40b rises, and when the temperature sensor detects that the temperature reaches the phase transition temperature of the second memory alloy, a signal is sent to the controller, and the controller controls the second operating part 522 to pop up, and at this time, the second circuit loop is disconnected.

[0088] In one embodiment, see Figure 1 As shown, the ball valve further includes a protective cap 80, which is threadedly connected to the valve seat 10 so as to cover the second sub-valve stem 32 inside the protective cap and be dustproof and waterproof.

[0089] When manual operation is required, the protective cap 80 can be removed first, and then the manual operation end can be rotated.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A ball valve, characterized in that: It comprises a valve seat, an opening and closing member, a valve stem, a first memory alloy member, a second memory alloy member and a power supply device, wherein the valve seat has a valve cavity and a first flow port and a second flow port communicated with the valve cavity, the opening and closing member is installed in the valve cavity, one end of the valve stem is connected to the opening and closing member, and the first memory alloy member and the second memory alloy member are both connected to the other end of the valve stem through a transmission mechanism; The power supply device can form a first circuit loop with the first memory alloy component, so that the transmission mechanism drives the valve stem to rotate in a first direction, and the connecting cavity of the opening and closing component is connected with the first flow port and the second flow port; the power supply device can also form a second circuit loop with the second memory alloy component, so that the transmission mechanism drives the valve stem to rotate in a second direction, and the connecting cavity of the opening and closing component is isolated from the first flow port and the second flow port, wherein the second direction is opposite to the first direction.

2. The ball valve according to claim 1, characterized in that: The transmission mechanism includes a gear and a rack; the gear is connected to the valve stem, the rack is meshed with the gear, one end of the first memory alloy component is fixedly connected to one end of the rack, and the other end of the first memory alloy component is fixedly connected to the valve seat; one end of the second memory alloy component is fixedly connected to the other end of the rack, and the other end of the second memory alloy component is fixedly connected to the valve seat.

3. The ball valve according to claim 2, characterized in that: At least one of the first memory alloy component and the second memory alloy component is a wound reed, one end of the wound reed located outside is fixedly connected to the rack, and one end of the wound reed located inside is fixedly connected to the valve seat via a central fixed shaft.

4. The ball valve according to claim 2, characterized in that: At least one of the first memory alloy component and the second memory alloy component is a straight plate-shaped spring leaf, one end of the straight plate-shaped spring leaf is fixedly connected to the rack, and the other end of the straight plate-shaped spring leaf is fixedly connected to the valve seat.

5. The ball valve according to claim 2, characterized in that: The valve stem comprises a first sub-valve stem and a second sub-valve stem connected to each other, one end of the first sub-valve stem away from the second sub-valve stem is connected to the opening and closing member, and the gear is installed between the first sub-valve stem and the second sub-valve stem.

6. The ball valve according to any one of claims 1 to 5, characterized in that: It also includes a limiting member connected to the valve stem; the valve seat is provided with a stopper, and the limiting member can abut against the stopper to limit the rotation angle of the valve stem.

7. The ball valve according to claim 6, characterized in that: The limiting member is a plate-shaped structure, and is provided with a mounting hole, and the mounting hole cooperates with the valve stem through a circumferential limiting structure to limit the circumferential rotation of the limiting member relative to the valve stem; The stop portion has a first stop surface and a second stop surface, the limit member has an arc-shaped protrusion, the arc-shaped protrusion has a first end and a second end, the end surface of the first end is configured to abut against the first stop surface when the valve stem rotates along the first direction; the end surface of the second end is configured to abut against the second stop surface when the valve stem rotates along the second direction.

8. The ball valve according to any one of claims 1 to 5, characterized in that: It also includes a switch device, which is used to make the power supply device and the first memory alloy component form the first circuit loop, or make the power supply device and the second memory alloy component form the second circuit loop.

9. The ball valve according to claim 8, characterized in that: It also includes a sealing cover, which is connected to the valve seat. A receiving space is provided on one side of the sealing cover close to the valve seat. Both the first memory alloy component and the second memory alloy component are located in the receiving space.

10. The ball valve according to claim 9, characterized in that The switch device comprises a first operating part and a second operating part, wherein the first operating part and the second operating part are both located outside the cover; The first operating part is electrically connected to one end of the first memory alloy component so that the power supply device and the first memory alloy component form the first circuit loop; or the second operating part is electrically connected to one end of the second memory alloy component so that the power supply device and the second memory alloy component form the second circuit loop.

11. The ball valve according to any one of claims 1 to 5, characterized in that: One end of the valve stem away from the opening and closing member is located outside the valve seat to form a manual operation end.

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