CN217977505U - SMA constant temperature valve core and constant temperature regulating valve - Google Patents

Abstract

The utility model discloses a SMA constant temperature valve core and constant temperature regulating valve, SMA constant temperature valve core include regulating part, E type jump ring, guide, go up casing, connecting rod, circlip, stopper, SMA spring, water proof pad, water proof seat, lower casing, piston, reset spring and draw the dish. The SMA thermostatic valve core is assembled in the outer shell of the thermostatic control valve, an SMA spring is installed in the SMA thermostatic valve core corresponding to a cold and hot mixed water outlet to serve as a temperature sensing driving element, when the preset temperature of the temperature adjusting wheel is constant, the water outlet temperature is increased due to the change of the hot water temperature and the flow, the SMA spring is hardened and extended to shorten the return spring, the piston in the valve core moves to enable the water inlet opening of the hot water flow channel to be reduced, the water inlet opening of the cold water flow channel to be increased, and the water outlet temperature is reduced. Otherwise, when the temperature of the outlet water is reduced, the piston moves reversely, so that the temperature of the outlet water is increased. The mixing proportion of cold water and hot water entering the water outlet is adjusted, so that the temperature of the outlet water is always kept constant. The utility model discloses a constant temperature regulating valve is longe-lived, high accuracy, high sensitivity, high temperature resistant, not scale deposit, compact structure and stability are good.

Description

SMA constant temperature valve core and constant temperature regulating valve

Technical Field

The utility model relates to a SMA constant temperature valve core and constant temperature regulating valve are applicable to civil aircraft life system field, especially are used for bathroom cold and hot water automatic balance's constant temperature regulating valve.

Background

The constant temperature valve is the main annex of civil aircraft life system, according to actual conditions, can be through constant temperature regulating valve control delivery port temperature for predetermineeing the constant value, the travelling comfort when guaranteeing the passenger to use the washing water. Most of the thermostatic valves on the market currently use a paraffin wax temperature sensing bulb as a temperature sensing element, so that the occupied space is large, the reaction speed is slow, and cold water and hot water are not sufficiently mixed, so that the mixed water is suddenly cooled and suddenly heated, and the comfort of washing water is influenced; meanwhile, a sealing element of the paraffin wax thermometer bulb belongs to a quick-wear part, and effective anti-scaling measures are not taken, so that the service life of the thermostatic valve is shortened seriously.

At present, a thermostatic valve adopting a memory alloy spring is reported, for example, chinese patents (upper and lower hot film type memory alloy thermostatic valve element, CN212690916U, 2021-03-12) disclose a thermostatic valve element designed by using a memory alloy, but the thermostatic valve element has the following problems, which results in a short service life, low reliability and high maintenance cost of the valve element:

(1) The outer side of the piston is coaxially provided with a water-resisting ring for resisting the mixing of heat insulation water and cold water, and the water-resisting ring is provided with an S-shaped elastic sheet, an upper protection ring and a lower protection ring, although the movement resistance of the piston is reduced by the structural design, on one hand, the S-shaped elastic sheet, the upper protection ring and the lower protection ring are all nonstandard parts, and the later maintenance and replacement cost is high, and on the other hand, because the S-shaped elastic sheet simultaneously plays a role of blocking impurities, after long-term use, impurities can be attached to the surface, the service life is influenced, the movement resistance of the piston is increased, and the piston has a better effect of reducing the movement resistance of the piston only in the initial stage of use and is not suitable for long-term use;

(2) The cold water inlet tank and the hot water inlet tank are respectively arranged on the upper shell and the lower shell, the upper shell and the lower shell are connected through threads, and the piston moves between the cold water inlet tank and the hot water inlet tank, so that the requirement on thread machining is very high, otherwise, when the upper shell and the lower shell are assembled together, if the thread machining precision is insufficient or the assembly operation is improper, the situation that the upper shell and the lower shell are not coaxial can occur, and at the moment, the piston movement resistance is very large, and the constant temperature adjustment cannot be rapidly carried out;

(3) The two ends of the piston are respectively adjusted in opening degree through the cold water sealing water ring and the hot water sealing water ring, the cold water sealing water ring and the hot water sealing water ring are elastic colloids, although the sealing effect is good, the hot water sealing ring fails after a long time, and furthermore, the sealing parts arranged at the two ends of the piston do not play a substantial role in constant temperature adjustment, but increase the maintenance cost;

(4) The reset spring in the upper shell is lack of a waterproof sealing structure, so that scale in cold water easily enters a cavity where the reset spring is located, and the reset spring is deformed and clamped;

(5) And both ends of the piston are lack of drainage structures.

In order to solve the above problem, the utility model provides a SMA constant temperature valve core and constant temperature regulating valve.

Disclosure of Invention

The utility model aims at providing a SMA thermostatic cartridge and thermostatic control valve to the problem that current thermostatic control valve exists, provides a reasonable in design, simple structure and cold, the abundant shape memory alloy thermostatic control valve of hot water mixture, avoids the incrustation scale harm, prolongs the life of thermostatic valve, and later maintenance is with low costs, and it is simple to change the accessory.

An SMA thermostatic valve core comprises a valve core body,

the upper shell is a cavity shell with two open ends;

the guide piece is connected in the cavity of the upper shell in a sliding manner, and a cavity is formed in the guide piece;

the first end of the adjusting piece is rotatably inserted in the cavity of the upper shell and is in threaded connection with the guide piece, and the second end of the adjusting piece extends to the outer side of the upper shell;

a return spring disposed in the cavity of the guide;

the lower shell is a cavity shell with two open ends, one end of the lower shell is connected with the upper shell, the circumferential surface of the lower shell is provided with a hot water inlet and a cold water inlet, the inner wall of the cavity of the lower shell is provided with a first annular bulge, and the inner annular hole of the first annular bulge forms a second water through hole;

the piston is connected in the cavity of the lower shell in a sliding mode and located between the hot water inlet and the cold water inlet on the circumferential surface of the lower shell, a first water through hole penetrating through the first end face and the second end face of the piston is formed in the piston, a hot water flow channel is formed between the first end face of the piston and the end face of the first annular bulge, and conical surface flow guide structures coaxial with the piston are arranged on the first end face and the second end face of the piston;

the water isolating cushion and the water isolating seat are arranged in the cavity of the lower shell and are arranged between the piston and the guide piece, and a cold water flow passage is formed among the water isolating cushion, the water isolating seat and the second end face of the piston;

the limiting block is arranged in the cavity of the guide piece;

the pull disc is connected in the cavity of the lower shell in a sliding manner, and a third water through hole is formed in the pull disc;

an SMA spring disposed in the cavity of the lower housing and interposed between the first annular protrusion and the pull disc

The connecting rod, the cavity of guide and the cavity of casing down are run through simultaneously to the connecting rod, and the connecting rod passes stopper, reset spring, water-proof pad, water-proof seat, piston, first annular arch, SMA spring in proper order and draws the dish and be connected with stopper, piston and the dish that draws wherein.

Furthermore, one end of the upper shell is inserted into the cavity of the lower shell and is connected with the lower shell through threads.

Further, the inner wall of the cavity of the upper shell comprises a wall surface with a regular hexagon section, the outer surface of the guide piece comprises a surface with a regular hexagon section, and the guide piece is connected to the wall surface with a regular hexagon section of the upper shell in a sliding manner through the surface with a regular hexagon section.

As an alternative to this, the first and second,

the limiting block is in threaded connection with the connecting rod and is used for limiting and providing pre-tightening force through an elastic check ring arranged in the inner cavity of the guide piece;

the piston is in threaded connection with the connecting rod;

the pull disc is in threaded connection with the connecting rod and is limited through a nut arranged on the connecting rod.

As an alternative to this, the first and second,

a positioning bulge is arranged on the inner wall of the inner cavity of the lower shell;

the water-proof seat is positioned in the inner cavity of the lower shell through the positioning bulge;

the outer edge of the water-proof cushion is positioned between the end face of the upper shell inserted into the lower shell and the water-proof seat.

Alternatively, a fifth sealing ring is arranged between the piston and the lower shell, and the fifth sealing ring is positioned between the first end surface and the second end surface of the piston.

As an option, the adjusting piece is positioned on the upper shell through an E-shaped clamp spring arranged on the end face of the upper shell, and a second sealing ring is arranged between the outer surface of the part, inserted into the upper shell, of the adjusting piece and the inner wall of the inner cavity of the upper shell.

A constant temperature regulating valve comprises a valve body,

the SMA thermostatic cartridge described above;

the SMA thermostatic valve core is inserted in an inner cavity of the outer shell, the outer shell is provided with a cold water inlet, a hot water inlet and a mixed water outlet, the cold water inlet and the hot water inlet respectively correspond to the cold water inlet and the hot water inlet on the circumferential surface of the lower shell, and the mixed water outlet corresponds to an end surface opening on one side of the pull disc in the lower shell;

the temperature adjusting wheel is fixedly connected with the second end of the adjusting piece, and a temperature mark is arranged on the temperature adjusting wheel;

the mounting bracket is detachably connected with the outer shell;

and the outlet joint is connected to the mounting bracket and communicated with the mixed water outlet on the outer shell.

Further, be provided with the third sealing washer between shell body and the last casing, be provided with fourth sealing washer and sixth sealing washer between shell body and the lower casing.

As an alternative to this, the first and second,

the cold water inlet, the hot water inlet and the external pipeline are connected in a flexible connection mode according with SAE-AS standard;

the mixed water outlet is connected with the outlet joint through a frustum transition structure and a first sealing ring;

the cold water inlet and the hot water inlet are provided with filter screens, or the outer shell is provided with the cold water inlet and the hot water inlet which are provided with the filter screens.

The utility model discloses a SMA constant temperature case possesses following characteristics:

(1) The common sealing ring is adopted between the piston and the lower shell to realize the isolation of cold water and hot water, and even if the sealing ring fails, the replacement cost is low because the sealing ring is a standard part;

(2) The hot water inlet and the cold water inlet are both processed on the surface of the lower shell, and the piston only slides in the lower shell, so that the assembly and processing of the upper shell and the lower shell are not involved, the processing and manufacturing difficulty is reduced, and the problem of large piston moving resistance caused by low assembly precision or low processing precision of the upper shell and the lower shell is avoided;

(3) The water isolating cushion and the water isolating seat are arranged between the return spring and the piston, and the matching part of the connecting rod and the water isolating cushion is of a smooth surface structure, so that the problems of movement or deformation clamping stagnation of the return spring and the guide piece caused by scale entering are protected to the maximum extent;

(4) The two ends of the piston are not provided with sealing elements made of rubber, so that the use of the sealing elements is reduced, and the maintenance cost and the maintenance difficulty are reduced;

(5) The two end faces of the piston are introduced with conical surfaces as a flow guide structure, and hot water and cold water stably and uniformly flow in through the conical surfaces and are mixed.

Compared with the prior art, the utility model discloses a SMA thermostatic cartridge and adopt SMA thermostatic cartridge's constant temperature regulating valve can be applied to civil aircraft life system, can realize that life system toilet delivery port temperature is for predetermineeing the constancy value, prevents that the water of going out from suddenly cooling suddenly heating, and travelling comfort when guaranteeing the passenger to use the washing water on the aircraft has characteristics such as longe-lived, high accuracy, high sensitivity, high temperature resistant, not scale deposit, compact structure and stability are good.

Drawings

FIG. 1 is a schematic view of the appearance structure of the constant temperature control valve of the present invention;

FIG. 2 is an assembled sectional view of the thermostatic regulating valve and the SMA thermostatic cartridge of the present invention;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a sectional view of the SMA thermostatic cartridge assembly of the present invention;

FIG. 5 is a schematic diagram of the piston structure of the present invention;

FIG. 6 is a structural view of the middle and lower shells of the present invention;

FIG. 7 is a drawing of a structure of the middle pulling plate of the present invention;

in the figure: 1. the temperature control device comprises a temperature adjusting wheel, 2. A mounting bracket, 3. An outlet joint, 4. A first cross groove pan head screw, 5. An outer shell, 6. A cross groove countersunk head screw, 7.SMA (shape memory alloy) constant temperature valve core, 8. A second cross groove pan head screw, 9. A first sealing ring, 10. A temperature indicator needle, 11. A temperature mark, 12. A connecting rod, 13. A nut, 14. A pull disc, 15.SMA spring, 16. A piston, 17. A lower shell, 18. A water insulation pad, 19. A water insulation seat, 20. A reset spring, 21. A guide piece, 22. An upper shell, 23.E type snap spring, 24. An adjusting piece, 25. A second sealing ring, 26. An elastic retainer ring, 27. A third sealing ring, 28. A limiting block, 29. A fourth sealing ring, 30. A fifth sealing ring, 31. A sixth sealing ring, 32. A first water through hole, 33. A second water through hole, 34. A third water through hole, 35. A mixed water outlet, 36. A cold water inlet, 37. A hot water inlet, 38. And 38. A cold water outlet.

Detailed Description

The following description of the present invention will be made with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the present invention is limited to the following embodiments, and various modifications, substitutions and changes made according to the ordinary technical knowledge and conventional means in the art without departing from the technical spirit of the present invention are included in the scope of the present invention.

As shown in fig. 1-7, for the utility model provides a pair of SMA (shape memory alloy shape memory alloys 'acronym) thermostatic cartridge and adopt the memory alloy thermostatic control valve of this thermostatic cartridge, memory alloy thermostatic control valve includes shell body 5, temperature adjusting wheel 1, installing support 2, SMA thermostatic cartridge 7 and outlet connection 3, and outlet connection 3 end is thermostatic control valve's delivery port 38.

As shown in fig. 2, an SMA thermostatic valve element 7 is arranged in the cavity of the outer shell 5. As shown in fig. 4, the SMA thermostatic valve element 7 is sequentially provided with an adjusting part 24, an E-shaped snap spring 23, a guide part 21, an upper shell 22, a connecting rod 12, an elastic retainer ring 26, a limiting block 28, an SMA spring 15, a water-stop pad 18, a water-stop seat 19, a lower shell 17, a piston 16, a return spring 20 and a pull disc 14 from top to bottom; the adjusting piece 24 and the guide piece 21 are connected through multi-start threads and are positioned inside the upper shell 22; the water-proof cushion 18 is arranged in the lower shell 17 through a water-proof seat 19 and is used for isolating the main moving parts from the scale; the upper shell 22 is connected with the lower shell 17 through threads, and the lower shell 17 comprises a cold water flow passage, a hot water flow passage and a mixed water outlet flow passage. The opening degree of the cold water flow passage and the hot water flow passage is adjusted by moving a piston 16 in a lower shell 17, and an SMA spring 15 serving as a temperature sensing driving element is limited at a mixed water outlet flow passage of the lower shell 17 (an opening at the lowest end of the lower shell 17 in FIG. 4) through a pull disc 14 in threaded connection with a connecting rod 12 and a nut 13; the SMA spring 15 and the return spring 20 are matched with a limiting block 28 in threaded connection with the connecting rod 12 and the pull disc 14 to apply acting force on the piston 16 which is also in threaded connection with the connecting rod 12, namely the piston 16 is pulled, so that the water temperature at the water outlet can meet a preset constant value.

As shown in fig. 2, the outer shell 5 is provided with a cold water inlet 37, a hot water inlet 36 and a mixed water outlet 35, the outer shell 5 is also provided with a threaded hole connected with the mounting bracket 2, and the inner wall of the outer shell 5 is provided with a plurality of bosses for being pressed with different sealing rings (a third sealing ring 27, a fourth sealing ring 29 and a sixth sealing ring 31) to realize sealing; the cold water inlet and the hot water inlet 36 on the outer shell 5 are connected with a water supply pipeline in a flexible connection mode conforming to SAE-AS1650 standard; the mixed water outlet on the outer shell 5 is connected with the outlet connector 3 through a frustum transition structure and a first sealing ring 9.

The outlet connector 3 is fixed with the mounting bracket 2 through a first cross-shaped groove screw pan head screw 4; the water outlet end of the outlet joint 3 is connected with a water outlet pipeline in a flexible connection mode conforming to SAE-AS1650 standard; the water inlet end of the outlet connector 3 is provided with a sealing ring groove, and the sealing ring groove is internally provided with a mixed water outlet of the first sealing ring 9 and the outer shell 5 to form external sealing, as shown in figure 2.

As shown in fig. 3, a plurality of mounting holes are reserved on the mounting bracket 2, and a temperature mark 11 is arranged on the surface close to the temperature adjusting wheel 1. The temperature adjusting wheel 1 is provided with a temperature indicating needle 10, one end of the temperature indicating needle is provided with a cross groove countersunk head screw hole, the other end of the temperature indicating needle is provided with a groove, and the bottom of the groove is connected with a hexagonal joint on the outer surface of the adjusting part 24 in a matching way by adopting an inner hexagonal hole.

Referring to fig. 4, an adjusting member 24 is provided at the upper end of the upper housing 22, and one end of the adjusting member 24 is connected to the temperature-adjusting wheel 1 by a cross-recessed countersunk head screw 6, and the other end is threadedly connected to the guide member 21.

As shown in fig. 4, the guide member 21 is movably disposed in the upper housing 22 up and down, one end of the guide member 2 is screwed to the adjusting member 24, and the other end abuts against the water-stop pad 18 on the water-stop seat 19; the water-proof pad 18 is used for separating the regulating member 24 in the upper housing 22, the guide member 21, the connecting rod 12 in the guide member 21, the stopper 28, the circlip 26 and the return spring 20 from the scale.

As shown in fig. 4, the surface of the connecting rod 12 is not a full thread, wherein the position of up and down moving contact with the water-proof pad 18 is a polished rod, which facilitates the isolation of scale.

As shown in fig. 4, one end of the return spring 20 is closely attached to the surface of the stop block 28 screwed on the connecting rod 12, and the other end of the return spring contacts the stop step in the guide 21, and the elastic collar 26 applies a pre-load force to the return spring 20 through the stop block 28 and limits the position of the stop block 28.

The limiting block 28 is provided with a positioning boss for positioning the return spring 20, so that the axial limiting of the return spring 20 is realized.

As shown in fig. 4 and 5, one end of the piston 16 forms a cold water flow channel for cold water to flow into with the lower end face of the water stop seat 19 and the water stop pad 18, and the other end forms a hot water flow channel for hot water to flow into with the inlet end face of the second through hole 33 in the inner cavity of the lower shell 17; as shown in fig. 5, the upper and lower ends of the piston 16 are flared and have a taper for drainage; the piston 16 is provided with a plurality of first water through holes 32 which penetrate through the upper end and the lower end of the piston 16 and through which cold water passes, and the first water through holes 32 are communicated with the upper end surface and the lower end surface of the piston 16. A fifth sealing ring 30 for sealing is arranged between the piston 16 and the lower shell 17.

As shown in fig. 4, the sma spring 15 has one end abutting against the outlet end surface of the second water passage hole 33 in the inner cavity of the lower case 17 and the other end abutting against the pull plate 14.

As shown in fig. 7 and 4, a positioning boss is provided on the surface of the pull disc 14 for positioning the SMA spring 15, so as to realize axial spacing of the SAM spring 15. Wherein, the drawing disc 14 is provided with a plurality of third water through holes 34 along the circumferential direction, and a mixed water outlet flow passage is formed between the third water through holes 34 and the inner wall of the inner cavity of the lower shell 17.

A second sealing ring 25 for sealing is arranged between the upper shell 22 and the adjusting piece 24, a third sealing ring 27 for sealing is arranged between the upper shell 22 and the outer shell 5, and a fourth sealing ring 29 and a sixth sealing ring 31 for sealing are arranged between the lower shell 17 and the outer shell 5.

Furthermore, the side wall of the lower shell 17 may be provided with a filter screen at the position corresponding to the hot water inlet and the cold water inlet, or provided with a filter screen at the position corresponding to the hot water inlet 36 and the cold water inlet 37 on the outer shell 5.

In the SMA constant temperature valve core 7, the SMA spring 15 and the return spring 20 drag the piston 16 through the limiting block 28, the pull disc 14 and the connecting rod 12, thereby realizing the movement interchange of the cold and hot water flow passage positions.

In this embodiment, as shown in fig. 1 to 7, when in use, the temperature adjustment wheel 1 is rotated clockwise according to fig. 3, the temperature adjustment wheel 1 drives the adjustment member 24 to rotate, so that the guide member 21, which is disposed in the hexagonal hole of the upper housing 22 (the inner cavity of the upper housing 22 has a section of inner wall with a regular hexagonal cross section, and the inner wall is matched with the outer surface of the adjustment member 24 with a regular hexagonal cross section), and is connected with the adjustment member 24 by a screw thread, moves axially, so that the return spring 20 disposed between the guide member 21 and the limit block 28 is pulled by the guide member 21, the limit block 28 screwed with the connecting rod 12 is pushed by the return spring 20, the piston 16 and the pull disc 14 screwed with the limit block 28 are pulled by the connecting rod 12, and then the piston 16 is pushed to move to the cold water side and compress the SMA spring 15, so as to increase the temperature of the mixed water; the temperature adjusting wheel 1 is rotated counterclockwise as shown in figure 3, and the temperature of the mixed water is reduced. When the preset water outlet temperature is constant and the cold water temperature and the hot water temperature are changed, the piston 16 is pushed by the SMA spring 15 and the return spring 20 to realize the automatic synchronous adjustment of the size of the cold water and hot water flow passage so as to stabilize the water outlet temperature.

In this embodiment, cold water firstly passes through a cold water flow channel formed by the piston 16 and the water stop seat 19 and then enters a cold and hot water mixing flow channel from a first water passage 32 on the piston 16 (the cold and hot water mixing flow channel comprises a flow channel formed by the lower part of the piston 16 and a first annular protrusion end surface on the inner wall of the cavity of the lower shell 17 and a cavity of the lower shell 17 where the SMA spring 15 is located), then hot water flowing in a hot water flow channel formed by the piston 16 and a first annular protrusion (an inner hole of the first annular protrusion forms a second water passage hole 33) in the lower shell 17 is mixed with cold and hot water, and the cold and hot water after mixing passes through the second water passage hole 33 on the lower shell 17 and the SMA spring 15 and then flows into the outlet joint 3 from a third water passage 34 formed between the pull disc 14 and the inner wall of the lower shell 17; the SMA spring 15 is always in a stable temperature field of the mixed water, and the temperature control effect of the constant-temperature regulating valve is fully exerted. Simultaneously, adopt sealed separation mode to avoid the erosion of incrustation scale to the moving part between rivers and main moving part: a water-proof pad 18 is provided between the piston 16 and the guide 21 to separate them.

It should be noted that in fig. 4, a gap is formed between the piston 16 and the end surface of the water stop seat 19 and at least one of the end surfaces of the first annular protrusion in the lower housing 17, and this gap forms a cold water flow passage or a hot water flow passage, when the gap between the piston 16 and one of the end surfaces is eliminated, the corresponding cold water flow passage or hot water flow passage is closed, and when gaps exist between the piston 16 and both end surfaces, the cold water flow passage and the hot water flow passage are opened simultaneously. In addition, for the sake of drawing, the lower housing 17 in fig. 4 is seen to be divided into three parts, i.e. it is seen to be divided into three parts from the upper and lower end surfaces of the piston 16, but actually the three parts are a whole, and referring to fig. 6, the broken parts at the upper and lower end surfaces of the piston 16 in fig. 4 are the cold water inlet and the hot water inlet formed in the lower housing 17, and the section in fig. 4 is taken to be the position just above.

The working principle of the utility model is as follows:

an SMA thermostatic valve core 7 is assembled in the outer shell 5, an SMA spring 15 is installed in the SMA thermostatic valve core 7 corresponding to a cold and hot mixed water outlet to serve as a temperature sensing driving element, when the preset temperature of the temperature adjusting wheel 1 is constant, and the outlet water temperature is increased due to the change of the hot water temperature and the flow, the SMA spring 15 is hardened and extended to shorten a return spring 20, and a piston 16 in the valve core moves to reduce the inlet opening of a hot water flow channel and increase the inlet opening of a cold water flow channel, so that the temperature of the outlet water is reduced. Otherwise, when the outlet water temperature is lowered, the piston 16 moves reversely, so that the outlet water temperature is raised. The mixing proportion of cold water and hot water entering the water outlet is adjusted, so that the temperature of the outlet water is always kept constant.

The above-mentioned embodiment is not used for limiting the protection scope of the utility model discloses a all be in the utility model discloses a deformation, modification or equivalence replacement etc. that make on the technical scheme basis all should fall into the protection scope of the utility model.

Claims (10)

1. An SMA constant temperature valve core is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the upper shell (22), the said upper shell (22) is the cavity shell with two open ends;

the guide piece (21), the guide piece (21) is connected in the cavity of the upper shell (22) in a sliding way, and a cavity is arranged inside the guide piece (21);

the first end of the adjusting piece (24) is rotatably inserted into the cavity of the upper shell (22) and is in threaded connection with the guide piece (21), and the second end of the adjusting piece (24) extends to the outer side of the upper shell (22);

a return spring (20), the return spring (20) being arranged in a cavity of the guide (21);

the water inlet device comprises a lower shell (17), wherein the lower shell (17) is a cavity shell with two open ends, one end of the lower shell (17) is connected with an upper shell (22), a hot water inlet and a cold water inlet are formed in the circumferential surface of the lower shell (17), a first annular bulge is arranged on the inner wall of the cavity of the lower shell (17), and a second water through hole (33) is formed in an inner annular hole of the first annular bulge;

the piston (16) is connected in a cavity of the lower shell (17) in a sliding mode and located between the hot water inlet and the cold water inlet on the circumferential surface of the lower shell (17), a first water through hole (32) penetrating through the first end face and the second end face of the piston (16) is formed in the piston (16), a hot water flow channel is formed between the first end face of the piston (16) and the end face of the first annular bulge, and conical surface flow guide structures coaxial with the piston are arranged on the first end face and the second end face of the piston (16);

the water-proof device comprises a water-proof cushion (18) and a water-proof seat (19), wherein the water-proof cushion (18) and the water-proof seat (19) are arranged in a cavity of the lower shell (17) and are arranged between the piston (16) and the guide piece (21), and a cold water flow channel is formed among the water-proof cushion (18), the water-proof seat (19) and the second end surface of the piston (16);

a stop block (28), the stop block (28) being arranged in the cavity of the guide member (21);

the pull disc (14), the pull disc (14) is connected in the cavity of the lower shell (17) in a sliding manner, and a third water through hole (34) is formed in the pull disc (14);

an SMA spring (15), the SMA spring (15) being disposed in a cavity of the lower housing (17), and the SMA spring (15) being interposed between the first annular projection and the pull disc (14)

Connecting rod (12), connecting rod (12) run through the cavity of guide (21) and the cavity of casing (17) down simultaneously, and connecting rod (12) pass stopper (28), reset spring (20), water proof pad (18), water proof seat (19), piston (16), first annular arch, SMA spring (15) and draw dish (14) and be connected with stopper (28), piston (16) and draw dish (14) wherein in proper order.

2. The SMA thermostatic cartridge of claim 1, wherein: one end of the upper shell (22) is inserted into the cavity of the lower shell (17) and connected with the lower shell (17) through threads.

3. The SMA thermostatic cartridge of claim 1, wherein: the inner wall of the cavity of the upper shell (22) comprises a wall surface with a regular hexagon section, the outer surface of the guide piece (21) comprises a surface with a regular hexagon section, and the guide piece (21) is connected to the wall surface with a regular hexagon section of the upper shell (22) in a sliding manner through the surface with a regular hexagon section.

4. The SMA thermostatic cartridge of claim 1, wherein:

the limiting block (28) is in threaded connection with the connecting rod (12) and is limited by an elastic check ring (26) arranged in the inner cavity of the guide piece (21) to provide pre-tightening force;

the piston (16) is in threaded connection with the connecting rod (12);

the pull disc (14) is in threaded connection with the connecting rod (12) and is limited by a nut (13) arranged on the connecting rod (12).

5. The SMA thermostatic cartridge of claim 1, wherein:

a positioning bulge is arranged on the inner wall of the inner cavity of the lower shell (17);

the water-proof seat (19) is positioned in the inner cavity of the lower shell (17) through a positioning bulge;

the outer edge of the water-proof cushion (18) is positioned between the end face of the upper shell (22) inserted into the lower shell (17) and the water-proof seat (19).

6. The SMA thermostatic cartridge of claim 1, wherein: a fifth sealing ring (30) is arranged between the piston (16) and the lower shell (17), and the fifth sealing ring (30) is located between the first end face and the second end face of the piston (16).

7. The SMA thermostatic cartridge of claim 1, wherein: the adjusting piece (24) is positioned on the upper shell (22) through an E-shaped clamp spring (23) arranged on the end face of the upper shell (22), and a second sealing ring (25) is arranged between the outer surface of the part, inserted into the upper shell (22), of the adjusting piece (24) and the inner wall of the inner cavity of the upper shell (22).

8. The utility model provides a constant temperature regulating valve which characterized in that: comprises the steps of (a) preparing a substrate,

the SMA thermostatic cartridge of claim 1;

the SMA thermostatic valve core is inserted into an inner cavity of the outer shell (5), the outer shell (5) is provided with a cold water inlet (37), a hot water inlet (36) and a mixed water outlet (35), the cold water inlet (37) and the hot water inlet (36) correspond to the cold water inlet and the hot water inlet on the circumferential surface of the lower shell (17) respectively, and the mixed water outlet (35) corresponds to an opening of the end face of one side of the middle pull disc (14) of the lower shell (17);

the temperature adjusting wheel (1), the temperature adjusting wheel (1) is fixedly connected with the second end of the adjusting piece (24), and a temperature mark is arranged on the temperature adjusting wheel (1);

the mounting bracket (2), the mounting bracket (2) and the outer shell (5) are detachably connected;

and the outlet connector (3) is connected to the mounting bracket (2) and communicated with a mixed water outlet (35) on the outer shell (5).

9. A thermostatic regulating valve according to claim 8, wherein: a third sealing ring (27) is arranged between the outer shell (5) and the upper shell (22), and a fourth sealing ring (29) and a sixth sealing ring (31) are arranged between the outer shell (5) and the lower shell (17).

10. A thermostatic regulating valve according to claim 8, wherein:

the cold water inlet (37) and the hot water inlet (36) are connected with an external pipeline in a flexible connection mode conforming to SAE-AS1650 standard;

the mixed water outlet (35) is connected with the outlet joint (3) through a frustum transition structure and a first sealing ring (9);

the cold water inlet (37) and the hot water inlet (36) are provided with filter screens, or the cold water inlet and the hot water inlet are arranged on the outer shell (5).

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