Thermostat with stable temperature control capability

Abstract

The utility model belongs to the technical field of engines, and particularly relates to a thermostat with stable temperature control capability. The valve mechanism is arranged in the frame body; the temperature sensing piece is sleeved with the valve mechanism and comprises a shell, a push rod and a sealing piston, one end of the shell is connected with the top of the frame body, the other end of the shell penetrates through the frame body, a cavity is formed in the shell, the bottom of the cavity is filled with paraffin, the push rod is arranged above the paraffin, one end of the push rod is inserted into the cavity, and the other end of the push rod abuts against the frame body; the push rod is in sliding connection with the inner wall of the cavity; the sealing piston is arranged between the paraffin and the push rod; the exhaust mechanism is arranged on the frame body; the temperature sensing piece is used for controlling opening and closing of the valve mechanism. The thermostat has the advantages that the sealing performance is high, paraffin in the temperature sensing part can be effectively prevented from leaking in the running process of the thermostat, and the thermostat has the stable temperature control capacity.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and specifically refers to a thermostat with stable temperature control capability. Background Technology

[0002] A thermostat is an automatic temperature regulating device. Its main function is to control the circulation path of engine coolant, ensuring that the engine operates at a suitable temperature. The thermostat contains a temperature sensor and a valve. The temperature sensor is filled with paraffin wax. During a cold start, the thermostat is closed, and the coolant circulates only slightly within the engine. As the coolant temperature rises, the paraffin wax expands, causing the temperature sensor to push the valve open, thus facilitating a larger circulation and rapidly dissipating heat from the engine.

[0003] However, the temperature sensing element in existing thermostats has poor sealing. During operation, paraffin wax may overflow, causing the thermostat to need to reach a higher temperature before it can open the valve to dissipate heat. This reduces the thermostat's ability to control temperature and affects its heat dissipation efficiency. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a thermostat with stable temperature control capabilities and strong sealing properties, which can effectively prevent the leakage of paraffin wax from the temperature sensing element during operation, thus enabling the thermostat to have stable temperature control capabilities.

[0005] The purpose of this utility model is achieved as follows: A thermostat, comprising:

[0006] Frame;

[0007] The valve mechanism is located within the frame body;

[0008] A temperature sensing element is sleeved with the valve mechanism. The temperature sensing element includes a housing, a push rod, and a sealing piston. One end of the housing is connected to the top of the frame, and the other end passes through the frame. The housing has a cavity, and the bottom of the cavity is filled with paraffin wax. The push rod is positioned above the paraffin wax, with one end inserted into the cavity and the other end abutting against the frame. The push rod is slidably connected to the inner wall of the cavity. The sealing piston is positioned between the paraffin wax and the push rod.

[0009] An exhaust mechanism is provided on the frame.

[0010] The temperature sensing element is used to control the opening and closing of the valve mechanism.

[0011] The present invention is further configured such that the sealing piston comprises:

[0012] A support member is disposed below the push rod, the top of the support member abuts against the bottom of the push rod, and the support member is slidably connected to the inner wall of the cavity;

[0013] A guide support ring is sleeved on the outside of the support member, and the guide support ring is in contact with the inner wall of the cavity;

[0014] A first sealing ring is sleeved on the outside of the support member. The first sealing ring is disposed above the guide support ring, and the outside of the first sealing ring is in contact with the inner wall of the cavity.

[0015] The present invention is further configured such that the housing comprises:

[0016] Upper shell, the push rod is inserted into the upper shell;

[0017] The lower shell contains the paraffin wax, and the upper shell is connected to the lower shell. A second sealing ring is provided between the upper shell and the lower shell.

[0018] The present invention is further configured such that the temperature sensing element also includes:

[0019] A diaphragm is disposed at the top of the lower shell, and the bottom of the diaphragm is in contact with the paraffin wax.

[0020] A semi-fluid is disposed above the diaphragm, with the top of the semi-fluid contacting the bottom of the support.

[0021] The present invention is further configured such that the valve mechanism includes:

[0022] A large circulation valve is disposed within the frame body and is sleeved onto the housing.

[0023] A first spring is disposed below the large circulation valve. The first spring is sleeved on the housing. One end of the first spring abuts against the large circulation valve, and the other end abuts against the frame.

[0024] The present invention is further configured such that the valve mechanism also includes:

[0025] A small circulation valve is located below the frame and is connected to the bottom of the housing;

[0026] A second spring is disposed between the small circulation valve and the frame. The second spring is sleeved on the housing, with one end abutting against the small circulation valve and the other end abutting against the frame.

[0027] The present invention is further configured such that the exhaust mechanism includes:

[0028] An exhaust pipe is provided on the frame, with an air outlet at the top and an air inlet at the bottom.

[0029] A float is disposed inside the exhaust pipe. The diameter of the float is smaller than the inner diameter of the exhaust pipe, and the diameter of the float is larger than the inner diameter of the air inlet and the air outlet.

[0030] By adopting the above technical solution, this utility model has at least the following beneficial effects:

[0031] 1. Paraffin wax is placed inside the housing, with a sealing piston positioned above it. A push rod is located above the sealing piston. When the coolant temperature rises, the paraffin wax expands due to heat, pushing the sealing piston upwards. The sealing piston, in turn, pushes the push rod upwards, thereby controlling the valve mechanism to open the large circulation loop for engine cooling. The sealing piston also seals the paraffin wax, preventing it from leaking out of the cavity during thermal expansion and contraction, thus improving the thermostat's heat dissipation efficiency and ensuring stable control of engine temperature. The exhaust mechanism, mounted on the frame, balances the air pressure within the pipes, improving the thermostat's operational safety and stability.

[0032] 2. The bottom of the support component features an arc-shaped concave surface. This surface effectively disperses the upward thrust generated by the expansion of paraffin wax, preventing uneven force distribution during upward movement and thus avoiding wear on the inner wall of the cavity, preventing paraffin wax leakage. A guide support ring and a first sealing ring are installed on the support component to seal the cavity within the housing, effectively preventing paraffin wax leakage, improving the stability of the temperature sensing element, and consequently enhancing the cooling efficiency and temperature control stability of the thermostat. The guide support ring also guides the movement of the sealing piston, ensuring its trajectory does not deviate from the predetermined direction and maintaining a uniform gap between the piston and the inner wall of the cavity. This prevents internal leakage or seal damage caused by piston misalignment, extending the service life of the temperature sensing element.

[0033] 3. A diaphragm is installed at the top of the lower shell. The diaphragm can seal the paraffin wax, further preventing paraffin wax leakage. At the same time, the diaphragm can deform when the paraffin wax expands due to heat, thereby transmitting the upward thrust of the paraffin wax. The semi-fluid is set above the diaphragm. The semi-fluid can transmit the thrust of the paraffin wax on the sealing piston. The semi-fluid has a strong deformation capacity and can cooperate with the arc-shaped concave surface to make the force on the sealing piston more uniform, improve the stability of the operation of the sealing piston and push rod, reduce the wear caused by uneven force on the inner wall of the cavity, improve the heat dissipation efficiency and temperature control stability of the thermostat, and extend the service life of the thermostat. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a thermostat with stable temperature control capability according to this utility model;

[0035] Figure 2 This is a cross-sectional view of the thermostat with stable temperature control capability according to this utility model;

[0036] Figure 3 This is an enlarged view of part A of this utility model;

[0037] Figure 4 This is an enlarged view of Part B of this utility model;

[0038] Figure 5 This is a schematic diagram of the sealing piston of this utility model;

[0039] Figure 6 This is a cross-sectional view of the sealing piston of this utility model;

[0040] The attached figures are labeled as follows: 1-frame, 2-valve mechanism, 21-large circulation valve, 22-first spring, 23-small circulation valve, 24-second spring, 31-housing, 32-push rod, 33-sealing piston, 34-cavity, 35-paraffin wax, 36-diaphragm, 37-semi-fluid, 41-exhaust pipe, 42-inlet, 43-outlet, 44-float, 311-upper shell, 312-lower shell, 313-second sealing ring, 331-support component, 332-arc concave surface, 333-guide support ring, 334-first sealing ring. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0042] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further described in subsequent drawings.

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-6 :

[0044] Example 1:

[0045] This embodiment provides a thermostat with stable temperature control capability, including:

[0046] Frame 1;

[0047] Valve mechanism 2 is installed inside frame 1;

[0048] The temperature sensing element is sleeved with the valve mechanism 2. The temperature sensing element includes a housing 31, a push rod 32, and a sealing piston 33. One end of the housing 31 is connected to the top of the frame 1, and the other end passes through the frame 1. The housing 31 has a cavity 34, and the bottom of the cavity 34 is filled with paraffin wax 35. The push rod 32 is located above the paraffin wax 35. One end of the push rod 32 is inserted into the cavity 34, and the other end abuts against the frame 1. The push rod 32 is slidably connected to the inner wall of the cavity 34. The sealing piston 33 is located between the paraffin wax 35 and the push rod 32.

[0049] The exhaust mechanism is installed on frame 1;

[0050] The temperature sensing element is used to control the opening and closing of the valve mechanism 2.

[0051] like Figure 1-6 As shown, the frame 1 is installed inside the engine water pipe. The upper part of the frame 1 is connected to the large circulation port, and the lower part is connected to the small circulation port. The valve mechanism 2 is installed inside the frame 1 and is sleeved on the outside of the housing 31. The valve mechanism 2 is fixed to the housing 31 and can move up and down with the housing 31. When the coolant temperature is low, the valve mechanism 2 is in its initial state, the large circulation port is closed, and the small circulation port is open. At this time, the engine does not need to dissipate heat, and the thermostat's heat dissipation effect is weak. When the coolant temperature rises, the paraffin wax 35 expands due to heat, generating an upward thrust on the sealing piston 33. The sealing piston 33 pushes the push rod 32 upward, and the top of the push rod 32 abuts against the top of the frame 1, generating a reverse force that drives the housing 31 and the valve mechanism 2 downward, opening the large circulation port and allowing coolant to enter, thus enhancing the engine's heat dissipation capacity. As the temperature continues to rise, the large circulation port gradually opens fully, and the small circulation port gradually closes, continuously enhancing the thermostat's cooling effect.

[0052] A sealing piston 33 is installed above the paraffin wax 35. The outer wall of the sealing piston 33 contacts the inner wall of the cavity 34. While transmitting upward thrust, the sealing piston 33 can seal the paraffin wax 35 to prevent leakage and prevent coolant from entering the cavity 34. This improves the stability of the temperature sensing element and thus the stability of the thermostat, enabling the thermostat to have a stable temperature control capability and extending its service life.

[0053] The exhaust mechanism is installed on the frame 1. When the large circulation port is closed, the gas generated in the coolant passing through the thermostat can be discharged to the large circulation port through the exhaust mechanism, thereby maintaining the pressure balance in the pipeline, reducing the obstruction of gas to the coolant circulation, and improving the safety and stability of the thermostat operation.

[0054] The housing 31 can be made of materials such as titanium steel. In this invention, magnesium oxide is preferred. Magnesium oxide has high strength and corrosion resistance, as well as strong heat transfer performance. It can quickly transfer the heat in the coolant to the paraffin 35, thereby improving the sensitivity of the thermostat. At the same time, it is lightweight, which can reduce the overall weight of the thermostat.

[0055] Example 2:

[0056] This embodiment provides a thermostat with stable temperature control capability. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0057] The sealing piston 33 includes:

[0058] Support member 331 is located below push rod 32. The top of support member 331 abuts against the bottom of push rod 32. Support member 331 is slidably connected to the inner wall of cavity 34. The bottom of support member 331 is provided with arc-shaped concave surface 332.

[0059] The guide support ring 333 is sleeved on the outside of the support member 331, and the guide support ring 333 is in contact with the inner wall of the cavity 34;

[0060] The first sealing ring 334 is sleeved on the outside of the support member 331. The first sealing ring 334 is located above the guide support ring 333, and the outside of the first sealing ring 334 is in contact with the inner wall of the cavity 34.

[0061] like Figure 1-3 As shown in Figures 5-6, the support member 331 is slidably connected to the inner wall of the cavity 34. The support member 331 can transmit the thrust generated by the thermal expansion of the paraffin wax 35 upward. The bottom of the support member 331 is provided with an arc-shaped concave surface 332. The arc-shaped concave surface 332 can effectively disperse the upward thrust generated by the paraffin wax 35 when it expands, thereby avoiding uneven force on the support member 331 when it moves upward, which would cause wear on the inner wall of the cavity 34 and lead to leakage of the paraffin wax 35. This improves the service life of the temperature sensing element and maintains the stability of the thermostat's temperature control capability.

[0062] A guide support ring 333 is provided on the support member 331. The guide support ring 333 can guide and support the movement of the sealing piston 33, ensuring that the movement trajectory of the sealing piston 33 does not deviate from the predetermined direction, and keeping the gap between the piston and the inner wall of the cavity 34 uniform. This prevents problems such as internal leakage or damage to the seal caused by piston deviation, and improves the service life of the temperature sensing element. At the same time, the guide support ring 333 can also play a certain sealing role, improve the sealing performance of the sealing piston 33, and prevent paraffin 35 leakage.

[0063] A first sealing ring 334 is provided on the guide support ring 333, which can seal the cavity 34 inside the housing 31, effectively preventing the leakage of paraffin 35, improving the working stability of the temperature sensing element, and thus improving the cooling efficiency and temperature control stability of the thermostat.

[0064] The guide support ring 333 is made of polyoxymethylene, which has high strength and hardness, as well as wear resistance and good dimensional stability, and can play a good supporting and guiding role for the sealing piston 33.

[0065] Example 3:

[0066] This embodiment provides a thermostat with stable temperature control capability. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0067] The housing 31 includes:

[0068] Upper shell 311, push rod 32 inserted into upper shell 311;

[0069] The lower shell 312 contains paraffin wax 35, and the upper shell 311 is connected to the lower shell 312. A second sealing ring 313 is provided between the upper shell 311 and the lower shell 312.

[0070] like Figure 1-3 As shown, the bottom of the upper shell 311 is provided with an external thread, and the top of the lower shell 312 is provided with an internal thread. The bottom of the upper shell 311 is inserted into the top of the lower shell 312 and connected by the thread, which facilitates the disassembly of the upper shell 311 and the lower shell 312 and improves the user's maintenance efficiency for the temperature sensing element.

[0071] A second sealing ring is provided between the upper shell 311 and the lower shell 312 to prevent paraffin 35 from flowing out from the gap between the upper shell 311 and the lower shell 312, thereby improving the stability of the temperature sensing element and thus improving the stability of the thermostat's temperature control capability.

[0072] The temperature sensing element also includes:

[0073] Diaphragm 36 is disposed at the top of the lower shell 312, and the bottom of diaphragm 36 is in contact with paraffin 35;

[0074] The semi-fluid 37 is disposed above the diaphragm 36, with the top of the semi-fluid 37 in contact with the bottom of the support 331.

[0075] like Figure 1-3 As shown in Figures 5-6, a diaphragm 36 is provided at the top of the lower shell 312. The diaphragm 36 can seal the paraffin 35, further preventing the paraffin 35 from leaking. At the same time, the diaphragm 36 can deform when the paraffin 35 is heated and expands, thereby transmitting the upward thrust of the paraffin 35.

[0076] The semi-fluid 37 is positioned above the diaphragm 36. The semi-fluid 37 can transmit the thrust of the paraffin 35 to the sealing piston 33. The semi-fluid 37 has a strong deformation capacity and can cooperate with the arc-shaped concave surface 332 to make the force on the sealing piston 33 more uniform, improve the stability of the operation of the sealing piston 33 and the push rod 32, reduce the wear caused by uneven force on the inner wall of the cavity 34, improve the heat dissipation efficiency and temperature control stability of the thermostat, and extend the service life of the thermostat.

[0077] The semi-fluid 37 is disposed between the diaphragm 36 and the support 331, which can prevent the diaphragm 36 from directly contacting the support 331, prevent the diaphragm 36 from getting stuck in the gap between the support 331 and the inner wall of the cavity 34 during the deformation process, thus preventing damage to the diaphragm 36 and extending the service life of the diaphragm 36.

[0078] The diaphragm 36 is made of fluororubber, which has good elasticity and sealing properties, as well as strong high temperature resistance and corrosion resistance, and can maintain stable performance in high temperature environments.

[0079] Semi-fluid 37 is made of a mixed silicone resin, which has strong high-temperature resistance and chemical stability, thus improving the service life of the temperature sensing element. It also has strong sealing properties, further sealing the paraffin wax 35 to prevent leakage, extend the thermostat's service life, and maintain the stability of the thermostat's temperature control capability.

[0080] Example 4:

[0081] This embodiment provides a thermostat with stable temperature control capability. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0082] Valve mechanism 2 includes:

[0083] The large circulation valve 21 is installed inside the frame 1 and is sleeved on the housing 31;

[0084] The first spring 22 is located below the large circulation valve 21. The first spring 22 is sleeved on the housing 31. One end of the first spring 22 abuts against the large circulation valve 21, and the other end abuts against the frame 1.

[0085] like Figure 1-3 As shown, the large circulation valve 21 is used to control the opening and closing of the large circulation port. The large circulation valve 21 is fixed to the housing 31 and can move up and down with the housing 31. The first spring 22 is used to reset the large circulation valve 21. When the coolant temperature rises, the large circulation valve 21 descends with the housing 31, at which time the large circulation port opens and the first spring 22 is compressed. When the coolant temperature drops, the first spring 22 generates an upward elastic force on the large circulation valve 21, thereby driving the large circulation valve 21 and the housing 31 to reset.

[0086] Valve mechanism 2 also includes:

[0087] Small circulation valve 23 is located below the frame 1 and is connected to the bottom of the housing 31.

[0088] The second spring 24 is located between the small circulation valve 23 and the frame 1. The second spring 24 is sleeved on the housing 31. One end of the second spring 24 abuts against the small circulation valve 23, and the other end abuts against the frame 1.

[0089] like Figure 1-3 As shown, the small circulation valve 23 is used to control the opening and closing of the small circulation port. The small circulation valve 23 is fixed to the bottom of the housing 31 and can move up and down with the housing 31. The second spring 24 is used to reset the small circulation valve 23. The top of the second spring 24 is connected to the bottom of the frame 1, and the bottom is connected to the top of the small circulation valve 23. When the coolant temperature rises, the small circulation valve 23 descends with the housing 31. At this time, the small circulation valve 23 closes, and the thermostat performs large circulation heat dissipation. The second spring 24 is stretched by force. When the temperature drops, the second spring 24 generates an upward elastic force on the small circulation valve 23, thereby driving the small circulation valve 23 to reset with the housing 31. At this time, the small circulation port opens, and the thermostat performs small circulation.

[0090] The exhaust system includes:

[0091] An exhaust pipe 41 is installed on the frame 1. The top of the exhaust pipe 41 is provided with an air outlet 43 and the bottom of the exhaust pipe 41 is provided with an air inlet 42.

[0092] A float 44 is installed inside the exhaust pipe 41. The diameter of the float 44 is smaller than the inner diameter of the exhaust pipe 41, and the diameter of the float 44 is larger than the inner diameter of the air inlet 42 and the air outlet 43.

[0093] like Figure 1-2 As shown in Figure 4, the exhaust pipe 41 is inserted into and fixed on the frame 1. When the large circulation valve 21 is closed, air bubbles in the coolant can enter the exhaust pipe 41 through the air inlet 42 and be discharged to the large circulation port from the air outlet 43, thereby maintaining the pressure balance in the pipeline, improving the safety of the thermostat operation, and reducing the obstruction of gas to the coolant circulation, improving the stability of the thermostat operation, thereby maintaining the stability of the thermostat's temperature control capability.

[0094] The float 44 can move freely inside the exhaust pipe 41. When gas and coolant enter the exhaust pipe 41, the float 44 moves upward and the gas can be discharged through the vent 43. After the gas is discharged, the float 44 is moved to the bottom of the vent 43 by buoyancy and blocks the vent 43 to prevent coolant from entering the large circulation port through the vent 43.

[0095] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A thermostat with stable temperature control capability, characterized in that, include: Frame (1); Valve mechanism (2) is disposed within the frame (1); A temperature sensing element is sleeved with the valve mechanism (2). The temperature sensing element includes a housing (31), a push rod (32), and a sealing piston (33). One end of the housing (31) is connected to the top of the frame (1), and the other end passes through the frame (1). A cavity (34) is provided inside the housing (31). The bottom of the cavity (34) is filled with paraffin wax (35). The push rod (32) is located above the paraffin wax (35). One end of the push rod (32) is inserted into the cavity (34), and the other end abuts against the frame (1). The push rod (32) is slidably connected to the inner wall of the cavity (34). The sealing piston (33) is located between the paraffin wax (35) and the push rod (32). An exhaust mechanism is provided on the frame (1); The temperature sensing element is used to control the opening and closing of the valve mechanism (2).

2. The thermostat with stable temperature control capability according to claim 1, characterized in that, The sealing piston (33) includes: A support member (331) is disposed below the push rod (32). The top of the support member (331) abuts against the bottom of the push rod (32). The support member (331) is slidably connected to the inner wall of the cavity (34). The bottom of the support member (331) is provided with an arc-shaped concave surface (332). A guide support ring (333) is sleeved on the outside of the support member (331), and the guide support ring (333) is in contact with the inner wall of the cavity (34); A first sealing ring (334) is sleeved on the outside of the support member (331). The first sealing ring (334) is disposed above the guide support ring (333). The outside of the first sealing ring (334) is in contact with the inner wall of the cavity (34).

3. The thermostat with stable temperature control capability according to claim 2, characterized in that, The housing (31) includes: Upper shell (311), the push rod (32) is inserted into the upper shell (311); The lower shell (312) contains the paraffin wax (35) disposed inside the lower shell (312), the upper shell (311) is connected to the lower shell (312), and a second sealing ring (313) is provided between the upper shell (311) and the lower shell (312).

4. The thermostat with stable temperature control capability according to claim 3, characterized in that, The temperature sensing element also includes: A diaphragm (36) is disposed on the top of the lower shell (312), and the bottom of the diaphragm (36) is in contact with the paraffin wax (35); A semi-fluid (37) is disposed above the diaphragm (36), with the top of the semi-fluid (37) in contact with the bottom of the support (331).

5. The thermostat with stable temperature control capability according to claim 1, characterized in that, The valve mechanism (2) includes: A large circulation valve (21) is installed inside the frame (1) and is sleeved on the housing (31); The first spring (22) is located below the large circulation valve (21). The first spring (22) is sleeved on the housing (31). One end of the first spring (22) abuts against the large circulation valve (21), and the other end abuts against the frame (1).

6. The thermostat with stable temperature control capability according to claim 5, characterized in that, The valve mechanism (2) further includes: A small circulation valve (23) is located below the frame (1), and the small circulation valve (23) is connected to the bottom of the housing (31); The second spring (24) is disposed between the small circulation valve (23) and the frame (1). The second spring (24) is sleeved on the housing (31). One end of the second spring (24) abuts against the small circulation valve (23), and the other end abuts against the frame (1).

7. The thermostat with stable temperature control capability according to claim 1, characterized in that, The exhaust mechanism includes: An exhaust pipe (41) is provided on the frame (1). The exhaust pipe (41) has an air outlet (43) at the top and an air inlet (42) at the bottom. A float (44) is disposed inside the exhaust pipe (41). The diameter of the float (44) is smaller than the inner diameter of the exhaust pipe (41), and the diameter of the float (44) is larger than the inner diameter of the air inlet (42) and the air outlet (43).

Images