A three-stage opening electronic thermostat structure for internal combustion engine

Abstract

The present invention discloses a three-stage opening type electronic thermostat structure for an internal combustion engine. It comprises an upper cover body, a lower cover body and a thermostat body, wherein the upper cover body is fixedly connected to the lower cover body, a first channel and a second channel for coolant circulation are provided in the space formed inside the upper cover body and the lower cover body, and the thermostat body is installed in the first channel and the second channel, the upper cover body is provided with a first interface connected to the radiator inlet, the lower cover body is provided with a second interface connected to the engine water pump inlet and a third interface connected to the engine cooling water channel outlet, and the thermostat body is used to realize the first stage opening, the second stage opening and the third stage opening in sequence during the process of cooling liquid heating, the first stage opening is the first channel opening and the second channel closing, the second stage opening is the first channel opening and the second channel opening, and the third stage opening is the first channel closing and the second channel opening. The present invention can realize the rapid heating of water in the cylinder body.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engine cooling systems, and in particular relates to a three-stage open type electronic thermostat structure for an internal combustion engine. Background Art

[0002] At present, the traditional wax thermostat is widely used in internal combustion engines to adjust the coolant temperature. The traditional wax thermostat has the advantages of simple structure, reliable performance, low price, etc., but it also has certain limitations. The structure of the traditional thermostat is as follows:

[0003] When the cooling temperature is lower than the specified value, the refined paraffin in the thermostat temperature sensor is solid, and the thermostat valve closes the channel between the engine and the radiator under the action of the spring. The coolant returns to the engine through the water pump and performs a small cycle in the engine. When the coolant temperature reaches the specified value, the paraffin begins to melt and gradually becomes liquid, and the volume increases and compresses the rubber tube to shrink it. While the rubber tube shrinks, it exerts an upward thrust on the push rod, and the push rod has a downward reverse thrust on the valve to open the valve. At this time, the coolant flows back to the engine through the radiator and the thermostat valve, and then through the water pump to perform a large cycle. Under this structure, in the small cycle, the temperature of the engine body will rise rapidly. After high temperature, the thermal efficiency, that is, the improvement of power, can be guaranteed. The rapid heating of the coolant is crucial. After high temperature, the thermal efficiency, that is, the improvement of power, can be guaranteed. At the same time, the high-temperature coolant will melt the paraffin in the thermostat, and the paraffin will gradually expand, squeeze and close the small circulation path. At this time, the overall temperature of the coolant will slowly rise; until the paraffin is acted upon by the high temperature to completely close the small circulation path, and then enter the large circulation, the coolant and the engine body have reached the ideal high temperature state, and the engine can reflect performance and low fuel consumption with optimal thermal efficiency.

[0004] Therefore, achieving rapid temperature rise of the coolant is conducive to quickly closing the small cycle and entering the large cycle, so that the engine can achieve the best thermal efficiency and improve energy utilization. In the traditional structure of the wax thermostat, the coolant temperature rises slowly in the two-stage open small cycle, which greatly limits the rapid temperature rise of the coolant. Therefore, the original structure is upgraded to make the rapid temperature rise of the coolant a development need. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a three-stage open electronic thermostat structure for an internal combustion engine that can quickly increase the cooling liquid heating rate.

[0006] The technical solution adopted by the present invention is: a three-stage opening electronic thermostat structure, including an upper cover body, a lower cover body and a thermostat body, the upper cover body is fixedly connected to the lower cover body, and a first channel and a second channel for coolant circulation are provided in the space formed inside the upper cover body and the lower cover body, and the thermostat body is installed in the first channel and the second channel, the upper cover body is provided with a first interface connected to the radiator inlet, the lower cover body is provided with a second interface connected to the engine water pump inlet and a third interface connected to the engine cooling water channel outlet, and the thermostat body is used to realize the first stage opening, the second stage opening and the third stage opening in sequence during the coolant heating process, the first stage opening is the first channel opening and the second channel closing, the second stage opening is the first channel opening and the second channel opening, and the third stage opening is the first channel closing and the second channel opening.

[0007] Furthermore, the thermostat body includes a large circulation valve, a small circulation valve, an auxiliary valve, a temperature sensor, a bracket, a first spring, a second spring and a third spring. The bracket is fixed in the first channel and the second channel. The temperature sensor runs through the large circulation valve, the small circulation valve, the auxiliary valve and the bracket. The large circulation valve is arranged at the upper end of the temperature sensor and is in sealing contact with the upper cover body. The small circulation valve is arranged in the middle of the temperature sensor and is in sealing contact with the bottom of the bracket. The auxiliary valve is arranged at the bottom of the temperature sensor. The top of the first spring is in contact with the large circulation valve and the bottom is in contact with the bracket. The top of the second spring is in limit contact with the upper end of the temperature sensor and the bottom is in contact with the bracket. The top of the third spring is in contact with the bottom of the small circulation valve and the bottom is in contact with the auxiliary valve.

[0008] Furthermore, the large circulation valve includes a first sealing plate and a first sealing ring, the inner side of the first sealing plate is sealed with the outer wall of the temperature sensor, the outer side of the first sealing plate is arranged inside the first sealing ring, the outer edge of the first sealing ring is in sealing contact with the inner wall of the channel of the upper cover body, and the top of the first spring is in contact with the bottom surface of the first sealing plate.

[0009] Furthermore, the small circulation valve includes a second sealing plate, a second sealing ring and a third sealing ring. The inner side of the second sealing plate is arranged inside the second sealing ring, and the outer side is arranged inside the third sealing ring. The top and inner side of the second sealing ring are sealed with the outer wall of the temperature sensor, the outer edge of the third sealing ring is sealed with the lower end of the inner wall of the bracket, and the top of the third spring is in contact with the bottom surface of the second sealing plate.

[0010] Furthermore, the auxiliary valve includes a side plate, a bottom plate and a top plate. The side plate is a conical structure with a large diameter at the upper end and a small diameter at the lower end. The outer side of the bottom plate is fixedly connected to the bottom of the side plate, and the inner side is limited and sealed with the outer wall of the temperature sensor. The top plate is an annular plate that matches the third sealing ring of the small circulation valve, and the bottom end of the third spring is in contact with the top surface of the bottom plate.

[0011] Furthermore, the temperature sensor includes a push rod, an inductor, a first rubber ring and a second rubber ring. The top of the push rod is fixed on the upper cover body, and the bottom of the push rod is located in the inductor. The first rubber ring is fixed on the top of the inductor and is located above the large circulation valve. The bottom end of the second rubber ring contacts the top of the small circulation valve, and the top end contacts the outer wall of the inductor. The bottom end of the inductor is provided with a limit block that cooperates with the auxiliary valve limit.

[0012] Furthermore, the bracket includes a top ring, a bottom ring and a middle ring, the top ring is embedded in the upper cover body, the bottom ring is arranged in contact with the inner wall of the lower cover body, the middle ring is arranged around the temperature sensor, the top ring and the bottom ring are fixedly connected by a plurality of vertical support bars arranged at intervals, the bottom ring and the middle ring are fixedly connected by a plurality of horizontal support bars arranged at intervals, and the bottom of the second spring is supported on the top of the middle ring.

[0013] Furthermore, a third channel for exhaust is provided on the upper cover body, and the top and bottom ends of the third channel are respectively connected to the space at the upper and lower ends of the large circulation valve, and a first ball valve is arranged in the third channel. The third channel is a variable diameter channel with a small diameter in the upper section and a large diameter in the lower section. The diameter of the first ball valve is larger than the diameter of the upper section and smaller than the diameter of the lower section, and the top of the bracket is arranged at the bottom of the lower section of the third channel.

[0014] Furthermore, the bracket is provided with a fourth channel for exhaust, the top and bottom ends of the fourth channel are respectively connected to the space at the upper end and the lower end of the small circulation valve, a second ball valve is set in the fourth channel, the fourth channel is a variable diameter channel with a large diameter in the upper section and a small diameter in the lower section, the diameter of the second ball valve is smaller than the diameter of the upper section and larger than the diameter of the lower section, and the bottom of the first spring is supported on the top of the upper section of the fourth channel.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention can effectively improve the speed and efficiency of water temperature rise: the thermostat body arranged in the upper and lower covers is in the initial state, and both the large and small cycles are closed. At this time, the water in the cylinder is relatively still, and the water in the cylinder can be quickly heated up; as the water temperature rises, the small cycle valve opens (i.e., the first-level opening is achieved), the flow rate gradually increases, and the water temperature rise rate gradually decreases. The heating push rod heats the paraffin, allowing the paraffin to expand due to heat and generate an expansion force, which is transmitted to the push rod and converted into the thrust of the push rod to open the large cycle valve (i.e., the second-level opening is achieved), adjust the flow rate, and control the water temperature rise until the small cycle is completely closed and the large cycle is fully opened (i.e., the third-level opening is achieved). The speed of water temperature rise is adjusted by controlling the flow rate, thereby improving the efficiency of the internal combustion engine.

[0017] 2. The present invention can effectively improve structural reliability:

[0018] ① The present invention respectively arranges a swing valve consisting of a channel and a ball valve on the upper cover and the bracket, that is, a double swing valve design, which has an exhaust function when adding coolant, and can effectively prevent the coolant from mixing with air and causing the engine to overheat. When the thermostat is operating normally, closing the swing valve can prevent excessive water leakage. The first swing valve is located at the opening where the upper end of the bracket connects with the cover, and the rubber structure of the bracket is used to ensure low leakage during normal use; the second is an opening on the bracket, located at the lower end of the bracket and the first spring, and a spring is used to prevent the ball valve from escaping, reducing the number of parts and the difficulty of process assembly.

[0019] ②The third spring can act as a one-way valve. After the sensor fails and the water pressure in the cavity is too high, it pushes the small circulation valve downward so that the small circulation valve can be opened by water pressure, avoiding excessive engine pressure and temperature and realizing fault protection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of the first viewing angle of the present invention.

[0021] Figure 2 It is a cross-sectional schematic diagram of the second viewing angle of the present invention.

[0022] Figure 3 It is a cross-sectional schematic diagram of the third viewing angle of the present invention.

[0023] In the figure, 1-upper cover; 2-lower cover; 3-thermostat body; 4-first channel; 5-second channel; 6-first interface; 7-second interface; 8-third interface; 9-large circulation valve; 9.1-first sealing plate; 9.2-first sealing ring; 10-small circulation valve; 10.1-second sealing plate; 10.2-second sealing ring; 10.3-third sealing ring; 11-auxiliary valve; 11.1-side plate; 11.2-bottom plate; 11.3-top plate; 12-temperature sensor; 12.1-push rod; 12.2- Sensor; 12.3-first rubber ring; 12.4-second rubber ring; 12.5-limiting block; 13-bracket; 13.1-top ring; 13.2-bottom ring; 13.3-middle ring; 13.4-vertical support bar; 13.5-lateral support bar; 14-first spring; 15-second spring; 16-third spring; 17-third channel; 17.1-upper section; 17.2-lower section; 18-first ball valve; 19-fourth channel; 19.1-upper section; 19.2-lower section; 20-second ball valve. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1-3 As shown, the present invention provides a three-stage opening type electronic thermostat structure, comprising an upper cover body 1, a lower cover body 2 and a thermostat body 3, wherein the upper cover body 1 is fixedly connected to the lower cover body 2, a first channel 4 and a second channel 5 for coolant circulation are arranged in a space formed inside the upper cover body 1 and the lower cover body 2, and the thermostat body 3 is installed in the first channel 4 and the second channel 5, the upper cover body 1 is provided with a first interface 6 connected to a radiator inlet, the lower cover body 2 is provided with a second interface 7 connected to an engine water pump inlet and a third interface 8 connected to an engine cooling water channel outlet, the channel between the third interface 8 and the second interface 7 forms a first channel 4, and the channel between the third interface 8 and the first interface 6 forms a second channel 5, the thermostat body 3 is used to keep the first channel 4 and the second channel 5 closed in an initial state, and is used to realize the first stage opening, the second stage opening and the third stage opening in sequence during the process of cooling liquid heating, the first stage opening is that the first channel 4 is opened and the second channel 5 is closed, the second stage opening is that the first channel 4 is opened and the second channel 5 is opened, and the third stage opening is that the first channel 4 is closed and the second channel 5 is opened.

[0026] In the above scheme, the thermostat body 3 includes a large circulation valve 9, a small circulation valve 10, an auxiliary valve 11, a temperature sensor 12, a bracket 13, a first spring 14, a second spring 15 and a third spring 16. The bracket 13 is fixed in the first channel 4 and the second channel 5. The temperature sensor 12 runs through the large circulation valve 9, the small circulation valve 10, the auxiliary valve 11 and the bracket 12. The large circulation valve 9 is arranged at the upper end of the temperature sensor 12 and is in sealing contact with the upper cover body 1. The small circulation valve 10 is arranged in the middle of the temperature sensor 12 and is in sealing contact with the bottom of the bracket 13. The auxiliary valve 11 is arranged at the bottom of the temperature sensor 12. The top of the first spring 14 contacts the bottom of the large circulation valve 9 and the bottom contacts the bottom ring 13.2 of the bracket 13. The top of the second spring 15 contacts the upper end of the temperature sensor 12 and the bottom contacts the middle ring 13.3 of the bracket 13. The top of the third spring 16 contacts the bottom of the small circulation valve 10 and the bottom contacts the auxiliary valve 11. The first spring 14 , the second spring 15 and the third spring 16 are all in a compressed state in the initial state, ensuring that the first channel 4 and the second channel 5 are both closed.

[0027] In the above scheme, the large circulation valve 9 includes a first sealing plate 9.1 and a first sealing ring 9.2. The inner side of the first sealing plate 9.1 is sealed with the outer wall of the temperature sensor 12, and the outer side of the first sealing plate 9.1 is arranged inside the first sealing ring 9.2. The outer edge of the first sealing ring 9.2 is in sealing contact with the inner wall of the channel of the upper cover body 1, and the top of the first spring 14 is in contact with the bottom surface of the first sealing plate 9.1.

[0028] In the above scheme, the small circulation valve 10 includes a second sealing plate 10.1, a second sealing ring 10.2 and a third sealing ring 10.3. The inner side of the second sealing plate 10.1 is arranged inside the second sealing ring 10.2, and the outer side is arranged inside the third sealing ring 10.3. The top and inner side of the second sealing ring 10.2 are sealed with the outer wall of the temperature sensor 12. The outer edge of the third sealing ring 10.3 is in sealing contact with the lower end of the inner wall of the bottom circular ring 13.2 of the bracket 13. The top of the third spring 16 is in contact with the bottom surface of the second sealing plate 10.1.

[0029] In the above scheme, the auxiliary valve 11 includes a side plate 11.1, a bottom plate 11.2 and a top plate 11.3. The side plate 11.1 is a conical structure with a large diameter at the upper end and a small diameter at the lower end. The outer side of the bottom plate 11.2 is fixedly connected to the bottom of the side plate 11.1, and the inner side is limited and sealed with the outer wall of the temperature sensor 12. The top plate 11.3 is an annular plate that matches the third sealing ring 10.3 of the small circulation valve 10 or the inner wall of the pipe mouth, and the bottom end of the third spring 16 contacts the top surface of the bottom plate 11.2.

[0030] In the above scheme, the temperature sensor 12 includes a push rod 12.1, an inductor 12.2, a first rubber ring 12.3 and a second rubber ring 12.4. The top of the push rod 12.1 is fixed on the upper cover body, and the bottom of the push rod 12.1 is located in the inductor 12.2. The first rubber ring 12.3 is fixed to the top of the inductor 12.2 and is located above the large circulation valve 9, and is spaced a certain distance from the large circulation valve 9. The bottom end of the second rubber ring 12.4 contacts the top of the second sealing ring 10.2 of the small circulation valve 10, and the top end contacts the outer wall of the inductor 12.2. When the inductor 12.2 moves downward, it can push the second rubber ring 12.4 and the small circulation valve 10 to move downward together. The bottom end of the inductor 12.2 is provided with a limit block 12.5 that cooperates with the auxiliary valve 11.

[0031] In the above scheme, the bracket 13 includes a top ring 13.1, a bottom ring 13.2 and a middle ring 13.3, the top ring 13.1 is embedded in the upper cover body, the bottom ring 13.2 is arranged in contact with the inner wall of the lower cover body 2, the middle ring 13.3 is arranged around the temperature sensor 12, the top ring 13.1 and the bottom ring 13.2 are fixedly connected by a plurality of vertical support bars 13.4 arranged at intervals, the top of the vertical support bar 13.4 is limitedly arranged between the top of the upper cover body 1, the bottom ring 13.2 and the middle ring 13.3 are fixedly connected by a plurality of horizontal support bars 13.5 arranged at intervals, and the bottom of the second spring 15 is supported on the top of the middle ring 13.3.

[0032] In the above scheme, the upper cover body 1 is provided with a third channel 17 for exhaust, the top and bottom ends of the third channel 17 are respectively connected to the space at the upper end and the lower end of the large circulation valve 9, and a first ball valve 18 is arranged in the third channel 17. The third channel 17 is a variable diameter channel with a small diameter in the upper section 17.1 and a large diameter in the lower section 17.2. The diameter of the first ball valve 18 is larger than the diameter of the upper section 17.1 and smaller than the diameter of the lower section 17.2. The top of the bracket 13 is arranged at the bottom of the lower section 17.2 of the third channel to prevent the first ball valve 18 from falling out of the third channel.

[0033] In the above scheme, the bracket 13 is provided with a fourth channel 19 for exhaust, the top and bottom ends of the fourth channel 19 are respectively connected to the space at the upper end and the lower end of the small circulation valve, and the second ball valve 20 is set in the fourth channel 19. The fourth channel 19 is a variable diameter channel with a large diameter in the upper section 19.1 and a small diameter in the lower section 19.2. The diameter of the second ball valve 20 is smaller than the diameter of the upper section 19.1 and larger than the diameter of the lower section 19.2. The bottom of the first spring 14 is supported on the top of the upper section 19.1 of the fourth channel 19.

[0034] The working principle of the present invention is as follows: in the initial state, the large and small circulations (i.e., the first channel 4 and the second channel 5) are completely closed. At this time, the coolant in the cylinder body hardly flows, and the coolant in the cylinder body can be quickly heated up briefly. During the heating process, the temperature sensor 12 senses the rise in water temperature, so that the paraffin in the sensor 12.2 expands due to heat and generates an expansion force, which is transmitted to the push rod 12.1 and converted into a thrust of the push rod 12.1. During the downward movement of the push rod 12.1, the sensor 12.2 is driven downward, and the second rubber ring 12.4 is squeezed downward, driving the small circulation valve 10 to move downward. The small circulation valve 10 compresses the third spring 16, and under the action of the elastic force of the third spring 16, the auxiliary valve 11 is driven to move downward together. At this time, the small circulation (i.e., the first channel 4) is opened to achieve the first-level opening, and the heated water returns to the cylinder body through the small circulation. At the same time, during the water heating process During the process, the sensor 12.2 has an enhanced ability to sense water temperature, the push rod 12.1 continues to squeeze the third spring 16 to drive the small circulation valve 10 to continue to move downward, the sensor 12.2 and the large circulation valve 9 cooperate and seal, and realize the function that the sensor 12.2 moves and the large circulation valve 9 does not move at the beginning. During the movement, the first rubber ring 12.3 at the top of the sensor 12.2 is driven downward, gradually contacts with the upper end of the large circulation valve 9, and squeezes the first spring 14 downward, and the large circulation (i.e., the second channel 5) is gradually opened. At this time, the large and small circulations are opened at the same time to realize the second-level opening. The thrust is applied until the auxiliary valve 11 presses the small circulation pipe mouth. At this point, the small circulation is closed, and the first rubber ring 12.3 continues to squeeze the large circulation valve 9 downward. Under the push of the thrust and the first rubber ring 12.3, the large circulation valve 9 is driven to move downward, so that the large circulation is fully opened, and the third-level opening is realized.

[0035] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A three-stage opening electronic thermostat structure, characterized in that: The thermostat comprises an upper cover, a lower cover and a thermostat body, wherein the upper cover is fixedly connected to the lower cover, a first channel and a second channel for coolant circulation are arranged in a space formed inside the upper cover and the lower cover, and the thermostat body is installed in the first channel and the second channel, a first interface connected to a radiator inlet is arranged on the upper cover, a second interface connected to an engine water pump inlet and a third interface connected to an engine cooling water channel outlet are arranged on the lower cover, and the thermostat body is used to sequentially realize first-stage opening, second-stage opening and third-stage opening in the process of cooling liquid heating, wherein the first-stage opening is that the first channel is opened and the second channel is closed, the second-stage opening is that the first channel is opened and the second channel is opened, and the third-stage opening is that the first channel is closed and the second channel is opened; The thermostat body comprises a large circulation valve, a small circulation valve, an auxiliary valve, a temperature sensor, a bracket, a first spring, a second spring and a third spring. The bracket is fixed in the first channel and the second channel. The temperature sensor runs through the large circulation valve, the small circulation valve, the auxiliary valve and the bracket. The large circulation valve is arranged at the upper end of the temperature sensor and is in sealing contact with the upper cover body. The small circulation valve is arranged in the middle of the temperature sensor and is in sealing contact with the bottom of the bracket. The auxiliary valve is arranged at the bottom of the temperature sensor. The top of the first spring is in contact with the large circulation valve and the bottom is in contact with the bracket. The top of the second spring is in contact with the upper limit of the temperature sensor and the bottom is in contact with the bracket. The top of the third spring is in contact with the bottom of the small circulation valve and the bottom is in contact with the auxiliary valve. The large circulation valve comprises a first sealing plate and a first sealing ring, the inner side of the first sealing plate is sealed with the outer wall of the temperature sensor, the outer side of the first sealing plate is arranged inside the first sealing ring, the outer edge of the first sealing ring is in sealing contact with the inner wall of the channel of the upper cover body, and the top of the first spring is in contact with the bottom surface of the first sealing plate; The small circulation valve comprises a second sealing plate, a second sealing ring and a third sealing ring. The inner side of the second sealing plate is arranged inside the second sealing ring, and the outer side is arranged inside the third sealing ring. The top and inner side of the second sealing ring are sealed with the outer wall of the temperature sensor. The outer edge of the third sealing ring is sealed with the lower end of the inner wall of the bracket. The top of the third spring contacts the bottom surface of the second sealing plate. The auxiliary valve includes a side plate, a bottom plate and a top plate. The side plate is a conical structure with a large diameter at the upper end and a small diameter at the lower end. The outer side of the bottom plate is fixedly connected to the bottom of the side plate, and the inner side is limited and sealed with the outer wall of the temperature sensor. The top plate is an annular plate that matches the third sealing ring of the small circulation valve, and the bottom end of the third spring is in contact with the top surface of the bottom plate. The temperature sensor includes a push rod, an inductor, a first rubber ring and a second rubber ring. The top of the push rod is fixed on the upper cover body, and the bottom of the push rod is located in the inductor. The first rubber ring is fixed on the top of the inductor and is located above the large circulation valve. The bottom end of the second rubber ring contacts the top of the small circulation valve, and the top end contacts the outer wall of the inductor. A limit block is provided at the bottom of the inductor to cooperate with the limit of the auxiliary valve.

2. The three-stage opening electronic thermostat structure according to claim 1 is characterized in that: The bracket includes a top ring, a bottom ring and a middle ring, the top ring is embedded in the upper cover body, the bottom ring is arranged in contact with the inner wall of the lower cover body, the middle ring is arranged around the temperature sensor, the top ring and the bottom ring are fixedly connected by a plurality of vertical support bars arranged at intervals, the bottom ring and the middle ring are fixedly connected by a plurality of horizontal support bars arranged at intervals, and the bottom of the second spring is supported on the top of the middle ring.

3. The three-stage opening electronic thermostat structure according to claim 1 is characterized in that: The upper cover body is provided with a third channel for exhaust, the top and bottom of the third channel are respectively connected to the space at the upper and lower ends of the large circulation valve, a first ball valve is arranged in the third channel, the third channel is a variable diameter channel with a small diameter in the upper section and a large diameter in the lower section, the diameter of the first ball valve is larger than the diameter of the upper section and smaller than the diameter of the lower section, and the top of the bracket is arranged at the bottom of the lower section of the third channel.

4. The three-stage opening electronic thermostat structure according to claim 1 is characterized in that: The bracket is provided with a fourth channel for exhaust, the top and bottom of the fourth channel are respectively connected to the space at the upper end and the lower end of the small circulation valve, a second ball valve is set in the fourth channel, the fourth channel is a variable diameter channel with a large diameter in the upper section and a small diameter in the lower section, the diameter of the second ball valve is smaller than the diameter of the upper section and larger than the diameter of the lower section, and the bottom of the first spring is supported on the top of the upper section of the fourth channel.

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