CN219587637U - Thermostat based on pneumatic transmission system - Google Patents

Abstract

The utility model discloses a thermostat based on a pneumatic transmission system, which comprises a temperature sensing body, a pushing device, a rebound device and a fixing device, wherein the pushing device comprises a push rod and a piston push plate; the upper cavity is communicated with the lower cavity through a pipeline A and a pipeline B, the pipeline A is connected with a piston cylinder, the piston cylinder is communicated with a square air bag through a pipeline C, the square air bag is arranged below a piston push plate, a travel switch is arranged on the piston push plate corresponding to the square air bag, a one-way valve is arranged on the pipeline B, a two-position two-way electromagnetic directional valve is connected, and the two-position two-way electromagnetic directional valve is communicated with the pipeline C through a pipeline D. The utility model controls the up-and-down movement of the temperature sensing body through the pneumatic transmission system, thereby controlling the valve of the thermostat and avoiding the problems of oscillation and the like of the thermostat; the gas is more sensitive to temperature sensing.

Description

Thermostat based on pneumatic transmission system

Technical Field

The utility model relates to the technical field of automobile thermostat structures, in particular to a thermostat based on a pneumatic transmission system.

Background

A thermostat is a valve that controls the flow path of the coolant. Paraffin in the common wax type thermostat structure has low melting speed, is not fast enough to react to temperature, is easy to cause the problem of wearing parts of the thermostat due to leakage, and is easy to age; the arrangement mode of arranging the thermostat in the water outlet pipeline of the cylinder cover has the advantages of simple structure and easiness in removing bubbles in a water cooling system; the disadvantage is that the thermostat can be repeatedly opened and closed in a short time when in operation, and the phenomenon is called thermostat oscillation; when this occurs, the fuel consumption of the automobile will increase. The thermostat can also be arranged in the water outlet pipeline of the radiator, and the arrangement mode can reduce or eliminate the oscillation phenomenon of the thermostat and can accurately control the temperature of the cooling liquid; however, the structure is complex, the cost is high, and the automobile is mainly used for high-performance automobiles and automobiles which often run at high speed in winter.

Therefore, there is a need for a thermostat based on a pneumatic transmission system to solve the problems of low paraffin melting speed and slow temperature response in the conventional wax-type thermostat structure.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a thermostat based on a pneumatic transmission system, so as to solve the problems of low paraffin melting speed and low temperature response in the structure of a common wax-type thermostat.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a thermostat based on pneumatic transmission system, includes temperature sensing body, thrust unit, resilient means and fixing device, fixing device is used for fixed temperature sensing body and thrust unit, be equipped with the thermostat valve between temperature sensing body and the fixing device, its characterized in that: the pushing device comprises a push rod and a piston push plate, the temperature sensing body comprises a temperature sensing shell and an air pressure transmission system, the inner cavity of the temperature sensing shell is divided into an upper cavity and a lower cavity from the middle, a circle of convex groove is outwards formed in the upper end of the upper cavity, the piston push plate can be arranged in the convex groove in a vertically sliding mode, and the upper end of the piston push plate is fixedly connected with the fixing device through the push rod;

the pneumatic transmission system comprises a travel switch, a square air bag, a piston cylinder and a two-position two-way electromagnetic directional valve, wherein a pipeline A and a pipeline B which are communicated with the lower cavity are respectively arranged on the lower end surface of the inner cavity of the upper cavity, the pipeline A is connected with the piston cylinder, the piston cylinder is communicated with the square air bag through a pipeline C, the square air bag is arranged below a piston push plate, the travel switch is arranged on the lower end surface of the piston push plate corresponding to the square air bag, a one-way valve is arranged on the pipeline B and is connected with the two-position two-way electromagnetic directional valve, and the two-position two-way electromagnetic directional valve is communicated with the pipeline C through a pipeline D; the piston cylinder is used for opening or closing the communication between the pipeline A and the pipeline C according to the pressure, and the two-position two-way electromagnetic reversing valve is electrically connected with the travel switch;

the spring device comprises a spring A, the upper end of the spring A is fixedly connected with the outer wall of the temperature sensing body, the spring A is sleeved on the side wall of the temperature sensing body, and the lower end of the spring A is fixedly connected with the fixing device.

In order to optimize the technical scheme, the specific measures adopted further comprise:

further, the piston cylinder comprises a piston and a spring C, and the piston is fixedly arranged between a communication port with the pipeline A and a communication port with the pipeline C through the spring C.

Further, an air inlet valve is arranged on the side wall of the lower chamber.

Further, the air inlet valve comprises a rubber pad and a valve cover, wherein the side section of the rubber pad is I-shaped, the side wall of the lower cavity is provided with a mounting hole, the rubber pad is slidably arranged in the mounting hole, and the side edge of the mounting hole is provided with two air inlet holes.

Further, connecting sleeves extend outwards from the periphery of the air inlet holes, and the connecting sleeves are used for being connected with the valve cover in a threaded manner; the rubber pad is positioned on the pad surface of the inner cavity of the lower cavity and is used for blocking the two air inlets.

Further, the pipeline C is connected with a square air bag through an automatic buckle, and an I-shaped air bag opening provided with a circle of clamping grooves is fixed at the lower end of the square air bag; the automatic buckle comprises a steel ball, a spring B and a buckle, wherein an air inlet wall extends from the pipe orifice of the pipeline C, two through holes for placing the steel ball are symmetrically formed in the air inlet wall, and the steel ball can move left and right in the through holes through a gap between the steel ball and the through holes; the buckle sliding sleeve is arranged on the outer side of the air inlet wall, a circle of connecting baffle is extended at the lower end of the air inlet wall, a spring B is connected between the buckle and the connecting baffle, and the spring B is used for enabling the buckle to upwards prop against the steel balls; the outer diameters of flanges at the upper end and the lower end of the clamping groove of the I-shaped air bag opening are consistent with the inner diameter of the air inlet wall, the outer diameter of the clamping groove when the distance between the two steel balls is minimum is larger than the inner diameter of the buckle, and the inner diameter of the clamping groove when the distance between the two steel balls is maximum is not smaller than the inner diameter of the air inlet wall.

Further, the fixing device comprises an upper bracket, a lower bracket and a valve seat, wherein the upper bracket and the lower bracket are hollow structures, and the upper bracket is of a V-shaped structure with a downward opening; the lower end of the upper bracket is fixedly connected with a valve seat, the lower end of the valve seat is fixedly provided with a lower bracket, the valve seat is used for being fixed with the water outlet pipeline, and the maximum inner diameter of the upper bracket is smaller than the inner diameter of the valve seat; the upper end of the push rod is fixedly connected with the upper bracket, the temperature sensing body is fixed between the upper bracket and the lower bracket through connection with the piston push plate, an opening for the lower end of the temperature sensing body to extend out is formed in the lower end of the lower bracket, and the lower end of the spring A is fixed at the opening of the lower bracket around the temperature sensing body; the thermostat valve is arranged on the temperature sensing body and is positioned at the joint of the upper bracket and the valve seat, the thermostat valve is used for plugging the hollow structure of the upper bracket, and the outer diameter of the thermostat valve is smaller than the inner diameter of the valve seat.

Further, a center rod is fixed on the upper bracket, the center rod is fixed at the center of the upper bracket, and the lower end of the center rod penetrates through the piston push plate and is inserted into the temperature sensing body.

Further, a cover and a sealing gasket are arranged at the joint of the upper end of the piston push plate and the push rod.

Further, the lower end of the temperature sensing body is provided with a connecting shaft, and the connecting shaft is used for connecting the lower baffle.

The beneficial effects of the utility model are as follows:

the utility model controls the up-and-down movement of the temperature sensing body through the pneumatic transmission system, thereby controlling the opening and closing of the thermostat valve, avoiding the oscillation problem of the thermostat and the problems of paraffin leakage and rubber tube aging through pneumatic transmission, and the paraffin is amorphous because the gas expansion reaches the temperature required to be fixed by the specified pressure, and has no fixed melting point, and the paraffin can be continuously melted and solidified when the temperature of the cooling liquid is changed rapidly, thus causing the oscillation of the thermostat; the gas is sensitive to temperature, so that the problems of response delay and hysteresis caused by paraffin are solved; the problem that the wax-type thermostat cannot control the circulating flow according to the working requirement of an engine is solved by different degrees of thermal expansion of gas; and the contact surface of the square air bag can make the stress of the piston push plate more uniform, so that the opening size of the thermostat valve is convenient to control.

Drawings

FIG. 1 is a schematic view of the overall structure of a thermostat based on a pneumatic transmission system according to the present utility model;

FIG. 2 is a schematic diagram of an inductor of a thermostat based on a pneumatic transmission system according to the present utility model;

FIG. 3 is a schematic view of an intake valve of a thermostat based on a pneumatic transmission system according to the present utility model;

fig. 4 is a schematic diagram of a connection structure between a square air bag and a pipeline C of a thermostat based on a pneumatic transmission system according to the present utility model;

FIG. 5 is a schematic view of a thermostat based on a pneumatic transmission system according to the present utility model;

FIG. 6 is a schematic view of another use of a thermostat based on a pneumatic transmission system according to the present utility model.

Reference numerals: the device comprises a push rod, a 2-upper support, a 3-lower support, a 4-temperature sensing body, a 5-spring A, a 6-valve seat, a 7-thermostat valve, an 8-travel switch, a 9-square air bag, a 10-piston cylinder, an 11-two-position two-way electromagnetic reversing valve, a 12-one-way valve, a 13-lower chamber, a 14-cover and gasket, a 15-center rod, a 16-piston, a 17-air inlet valve, a 18-rubber pad, a 19-air inlet hole, a 20-valve cover, a 21-I-shaped air bag opening, a 22-spring B, a 23-air inlet wall, a 24-gasket, a 25-steel ball, a 26-buckle, a 27-spring C, a 28-lower baffle, a 29-connecting shaft, a 201-pipeline A, a 202-pipeline B, a 203-pipeline C, a 204-pipeline D, a 301-pipeline E, a 302-pipeline F, a 303-pipeline G, a 304-pipeline H, a 305-water pump and a 306-thermostat.

Description of the embodiments

The present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, a thermostat based on a pneumatic transmission system comprises a temperature sensing body 4, a pushing device, a rebound device and a fixing device, wherein the fixing device is used for fixing the temperature sensing body 4 and the pushing device, and a thermostat valve 7 is arranged between the temperature sensing body 4 and the fixing device; the pushing device comprises a push rod 1 and a piston push plate, the temperature sensing body 4 comprises a temperature sensing shell and an air pressure transmission system, the inner cavity of the temperature sensing shell is divided into an upper cavity and a lower cavity 13 from the middle, a circle of convex groove is outwards formed in the upper end of the upper cavity, the piston push plate can be arranged in the convex groove in a vertically sliding mode, and the upper end of the piston push plate is fixedly connected with the fixing device through the push rod 1 extending out of the temperature sensing body 4;

the pneumatic transmission system comprises a travel switch 8, a square air bag 9, a piston cylinder 10 and a two-position two-way electromagnetic directional valve 11, wherein a pipeline A201 and a pipeline B202 which are communicated with the lower chamber 13 are respectively arranged on the lower end surface of the inner cavity of the upper chamber, the pipeline A201 is connected with the piston cylinder 10, the piston cylinder 10 is communicated with the square air bag 9 through a pipeline C203, the square air bag 9 is arranged below a piston push plate, the travel switch 8 is arranged on the lower end surface of the piston push plate corresponding to the square air bag 9, a one-way valve 12 is arranged on the pipeline B202 and is connected with the two-position two-way electromagnetic directional valve 11, and the two-position two-way electromagnetic directional valve 11 is communicated with the pipeline C203 through a pipeline D204; the piston cylinder 10 is used for opening or closing the communication between the pipeline A201 and the pipeline C203 according to pressure, the two-position two-way electromagnetic directional valve 11 is electrically connected with the travel switch 8, and the travel switch 8 is used for controlling the two-position two-way electromagnetic directional valve 11 to work; wherein the travel switch 8 is opened by contacting with the square air bag 9, and is kept closed by not contacting with the square air bag;

the rebound device comprises a spring A5, the upper end of the spring A5 is fixedly connected with the outer wall of the temperature sensing body 4, the spring A5 is sleeved on the side wall of the temperature sensing body 4, and the lower end of the spring A5 is fixedly connected with the fixing device.

In this way, the pressure of the pipeline A201 communicated with the lower chamber 13 is changed by the change of the gas in the lower chamber, so that the piston cylinder 10 is driven to open or close the communication with the pipeline C203, and the expansion or contraction of the square air bag 9 is controlled; when the square air bag 9 is inflated, the force is applied to the piston push plate, and the whole temperature sensing body 4 moves downwards by the reaction force of the piston push plate, so that the change of opening and closing of the water outlet pipeline is completed. In this embodiment, the piston cylinder 10 and the two-position two-way electromagnetic directional valve 11 can be fixed on the inner wall of the temperature sensing housing, so that the downward movement stability of the temperature sensing body 4 is conveniently ensured. And the square air bag 9 can be expanded and deformed regularly, so that the piston push plate and the push rod 1 can be stressed uniformly.

In the embodiment, the temperature sensing body 4 is controlled to move up and down through the pneumatic transmission system, so that the thermostat valve 7 is controlled to be opened and closed, and the problem of oscillation of the thermostat, paraffin leakage and rubber tube aging are avoided through pneumatic transmission; the gas is sensitive to temperature, so that the problems of response delay and hysteresis caused by paraffin are solved; the problem that the wax-type thermostat cannot control the circulating flow according to the working requirement of an engine is solved by different degrees of thermal expansion of gas; and the contact surface of the square air bag 9 can make the stress of the piston push plate more uniform, so that the opening size of the thermostat valve 7 is convenient to control.

In the present embodiment, the piston cylinder 10 includes the piston 16 and the spring C27, the piston 16 being fixedly disposed between the communication port with the pipe a201 and the communication port with the pipe C203 through the spring C27; in this way, the piston 16 is displaced according to the change in pressure, thereby achieving communication or closing of the pipe a201 and the pipe C203.

As shown in fig. 3, in the present embodiment, the sidewall of the lower chamber 13 is provided with an intake valve 17; therefore, the air pressure in the lower chamber 13 can be conveniently regulated and controlled as required, and quick and convenient inflation can be realized.

The air inlet valve 17 comprises a rubber pad 18 with an I-shaped side section and a valve cover 20, the side wall of the lower chamber 13 is provided with a mounting hole, the rubber pad 18 is slidably arranged in the mounting hole, and two air inlet holes 19 are formed in the side edge of the mounting hole; thus, as shown in fig. 3, when air is introduced, the right end of the rubber pad 18 is pressed against the outer wall of the lower chamber 13 by air, the left end of the rubber pad 18 is spaced from the inner wall of the lower chamber 13, and air enters the lower chamber 13 through the air inlet 19; after the inflation is finished, the pressure in the lower chamber 13 is higher than the atmospheric pressure, and the left end of the rubber pad 18 is pressed to the inner wall of the lower chamber 13 under the action of factors such as pressure, so that the air inlet 19 is blocked, and sealing is realized.

Wherein, the periphery of the air inlet hole 19 extends outwards to form a connecting sleeve which is used for being connected with the valve cover 20 in a threaded manner; the rubber pad 18 is positioned on the pad surface of the inner cavity of the lower chamber 13 and is used for blocking the two air inlets 19; in this way, the tightness is increased by the threaded connection of the valve cap 20 with the connection sleeve, preventing the cooling fluid from entering the lower chamber 13.

As shown in fig. 4, in this embodiment, a pipe C203 is connected with a square air bag 9 by an automatic buckle, and an i-shaped air bag port 21 provided with a circle of clamping grooves is fixed at the lower end of the square air bag 9; the automatic buckle comprises a steel ball 25, a spring B22 and a buckle 26, wherein the pipe orifice of the pipeline C203 is extended to form an air inlet wall 23, two through holes for placing the steel ball 25 are symmetrically formed in the air inlet wall 23, and the steel ball 25 can move left and right in the through holes through a gap between the steel ball and the through holes; the buckle 26 is slidably sleeved on the outer side of the air inlet wall 23, a circle of connecting baffle is extended at the lower end of the air inlet wall 23, a spring B22 is connected between the buckle 26 and the connecting baffle, and the spring B22 is used for enabling the buckle 26 to upwards abut against the steel balls 25; the outer diameters of flanges at the upper end and the lower end of the clamping groove of the I-shaped air bag opening 21 are consistent with the inner diameter of the air inlet wall 23, the outer diameter of the clamping buckle 26 when the distance between the two steel balls 25 is minimum is larger than the inner diameter of the clamping buckle 26, and the inner diameter of the clamping groove when the distance between the two steel balls 25 is maximum is not smaller than the inner diameter of the air inlet wall 23. In this embodiment, the side wall of the buckle 26 is in a hollow structure, and the spring B22 is fixed in the hollow structure and fixedly connected with the connecting baffle; wherein, the external diameter of the air inlet wall 23 can be larger than the external diameter of the pipeline C203, the lower end of the buckle 26 extends out of the connecting baffle and is provided with a gasket 24, the gasket 24 is sleeved at the joint of the air inlet wall 23 and the pipeline C203, and the setting of the buckle 26 can be reinforced by the gasket 24.

Thus, when the square air bag 9 and the pipeline C203 are connected, the buckle 26 is pulled down, the upper surface of the buckle 26 is lower than the steel ball 25, the I-shaped air bag opening 21 enters the air inlet wall 23, and the steel ball 25 moves outwards. After the steel balls 25 slide into the clamping grooves of the I-shaped air bag openings 21, the buckles 26 are loosened, the buckles 26 move upwards, the steel balls 25 are extruded by the inner walls of the buckles 26 to move inwards and are clamped at the clamping grooves of the I-shaped air bag openings 21, so that convenient and stable installation is realized, and the disassembly and the assembly are convenient. The fastening type connecting mode is convenient for adapting to different automobile working conditions and changing air bags made of different materials.

In this embodiment, the fixing device includes an upper bracket 2, a lower bracket 3 and a valve seat 6, the upper bracket 2 and the lower bracket 3 are hollow structures, the upper bracket 2 is in a V-shaped structure with a downward opening, and when in use, cooling liquid can flow through the upper bracket 2 and the lower bracket 3 through the hollow structures; the lower end of the upper bracket 2 is fixedly connected with a valve seat 6, the lower end of the valve seat 6 is fixedly connected with a lower bracket 3, the valve seat 6 is used for being fixed with a water outlet pipeline, and the maximum inner diameter of the upper bracket 2 is smaller than the inner diameter of the valve seat 6; the upper end of the push rod 1 is fixedly connected with the upper bracket 2, the temperature sensing body 4 is fixed between the upper bracket 2 and the lower bracket 3 through connection with a piston push plate, an opening for the lower end of the temperature sensing body 4 to extend out is formed in the lower end of the lower bracket 3, and the lower end of the spring A5 surrounds the temperature sensing body 4 and is fixed at the opening of the lower bracket 3; the thermostat valve 7 is sleeved on the temperature sensing body 4 and is positioned at the joint of the upper bracket 2 and the valve seat 6, the thermostat valve 7 is used for plugging the hollow structure of the upper bracket 2, and the outer diameter of the thermostat valve 7 is smaller than the inner diameter of the valve seat 6.

Therefore, the thermostat valve 7 is driven to move up and down by the up and down movement of the temperature sensing body 4, so that the water outlet pipeline where the upper bracket 2 is positioned is communicated with or closed by other water outlet pipelines; in the present embodiment, the upper end of the spring A5 may also be fixedly connected to the lower end of the thermostat valve 7.

The upper bracket 2 is also fixed with a center rod 15, the center rod 15 is fixed at the center of the upper bracket 2, and the lower end of the center rod 15 passes through the piston push plate and is inserted into the temperature sensing body 4; therefore, the motion trail of the temperature sensing body 4 is further limited, and the use stability is ensured.

In the present embodiment, a cover and gasket 14 is provided at the junction of the upper end of the piston pusher plate and the push rod 1; thereby, the air tightness of the connection between the piston push plate and the temperature sensing body 4 is ensured; in this embodiment, the cap and gasket 14 may also seal the connection between the center rod 15 and the piston pusher plate.

In the present embodiment, a connecting shaft 29 is provided at the lower end of the temperature sensing body 4, and the connecting shaft 29 is used for connecting the lower baffle 28; therefore, by arranging the lower baffle 28, after the temperature sensing body 4 moves downwards, the water outlet pipeline positioned below can be accurately limited or blocked by the lower baffle 28.

As shown in fig. 5 and 6, in actual use, the coolant flows in from the engine block and out from the cylinder head. The thermostat 306 is fixed in the water outlet pipe of the cylinder head by means of the upper bracket 2 and the valve seat 6, wherein a pipe E301 leads to a water pump 305, a pipe F302 leads to a radiator, a pipe G303 leads to a fan heater, and a pipe H304 leads to an engine. When the thermostat valve 7 is closed, that is, the temperature sensing body 4 is at the upper position, the thermostat valve 7 blocks the upper bracket 2; the conduit F302 to the radiator is closed and the conduit H304 to the engine is open; the cooling liquid enters from the warm air blower through a pipeline G303, and returns to the engine through a pipeline E301 through a water pump 305, so that small circulation in the engine is realized. The coolant path includes: pipeline G303-pipeline H304-water pump 305-pipeline E301. When the thermostat valve 7 is opened, namely the temperature sensing body 4 moves downwards, the thermostat valve 7 opens the upper bracket 2 and the lower bracket 3; the pipe F302 to the radiator is open and the pipe H304 to the engine is closed; the cooling liquid enters from the warm air blower through the pipeline G303, flows through the pipeline F302 of the thermostat valve 7, and flows back to the engine from the pipeline E301 through the water pump 305 for large circulation. The coolant path includes: conduit G303-conduit F302-water pump 305-conduit E301.

Specifically, when the temperature of the cooling liquid is lower than the specified value, the gas in the lower chamber 13 of the temperature sensing body 4 of the thermostat 306 is not expanded, the gas pressure is lower than the spring force of the spring C27 of the upper chamber of the piston cylinder 10, the piston 16 is not moved, the gas cannot reach the pipeline C203, the gas in the square air bag 9 is not available, and the upward thrust can not be exerted on the piston push plate; the travel switch 8 is not triggered, and the two-position two-way electromagnetic directional valve 11 works at the left position; the thermostat valve 7 keeps the passage between the engine and the radiator closed under the action of the spring A5, and the coolant is returned to the engine via the water pump 305 to perform a small cycle in the engine.

When the temperature of the cooling liquid reaches a specified value, the gas in the lower chamber 13 of the temperature sensing body 4 is heated and expanded, the gas pressure in the lower chamber 13 is enhanced, the gas pressure is larger than the spring force of the spring C27 in the upper chamber of the piston cylinder 10, the piston 16 moves upwards, the gas flows to the square air bag 9 through the pipeline 203, the square air bag 9 expands to act on the piston push plate to push upwards, the reaction force of the piston push plate enables the temperature sensing body 4 to move downwards, so that the thermostat valve 7 is opened, and meanwhile, the lower baffle 28 seals a corresponding pipeline below; at this time, the coolant flows back to the engine via the radiator and the thermostat valve 7 and then the water pump 305, thereby performing large circulation.

The square air bag 9 is inflated and simultaneously triggers the travel switch 8, and the two-position two-way electromagnetic directional valve 11 works at the right position. Because the temperature is unchanged at this time, the square air bag 9 is inelastic, the pressure loss of the air in the pipeline is negligible, and the air flows from the square air bag 9, through the two-position two-way electromagnetic directional valve 11 and the one-way valve 12, and returns to the lower chamber 13 to form circulation. In the process, the pressure in the square air bag 9 is unchanged, and the push rod 1 is always acted with upward thrust.

At the same time, the low-temperature cooling liquid in the radiator flows into the machine body, so that the temperature of the cooling liquid is lower, the gas in the lower chamber 13 contracts when being cooled, the pressure of the gas in the lower chamber 13 is reduced, and the pressure of the gas is smaller than the spring force of the spring C27 in the upper chamber of the piston cylinder 10 and the pressure in the square air bag 9. At this time, the piston 16 moves downward, and the gas cannot flow back to the lower chamber 13 through the pipe 203, and the gas in the square airbag 9 flows back to the lower chamber 13 through the two-position two-way electromagnetic directional valve 11 and the one-way valve 12. The square air bag 9 is contracted, the upward thrust can not be acted on the piston push plate, and the temperature sensing body 4 is lifted back under the action of the spring A5; meanwhile, the travel switch 8 is not triggered, and the two-position two-way electromagnetic directional valve 11 works at the left position.

It should be noted that the terms like "upper", "lower", "left", "right", "front", "rear", and the like are also used for descriptive purposes only and are not intended to limit the scope of the utility model in which the utility model may be practiced, but rather the relative relationship of the terms may be altered or modified without materially altering the teachings of the utility model.

The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the utility model without departing from the principles thereof are intended to be within the scope of the utility model as set forth in the following claims.

Claims (10)

1. The utility model provides a thermostat based on pneumatic transmission system, includes temperature sensing body (4), thrust unit, resilient means and fixing device, fixing device is used for fixed temperature sensing body (4) and thrust unit, be equipped with thermostat valve (7), its characterized in that between temperature sensing body (4) and the fixing device: the pushing device comprises a push rod (1) and a piston push plate, the temperature sensing body (4) comprises a temperature sensing shell and an air pressure transmission system, the inner cavity of the temperature sensing shell is divided into an upper cavity and a lower cavity (13) from the middle, the upper end of the upper cavity is outwards provided with a circle of convex groove, the piston push plate can be arranged in the convex groove in a vertically sliding way, and the upper end of the piston push plate is fixedly connected with the fixing device through the push rod (1);

the pneumatic transmission system comprises a travel switch (8), a square air bag (9), a piston cylinder (10) and a two-position two-way electromagnetic directional valve (11), wherein a pipeline A (201) and a pipeline B (202) which are communicated with a lower cavity (13) are respectively arranged on the lower end face of the inner cavity of the upper cavity, the pipeline A (201) is connected with the piston cylinder (10), the piston cylinder (10) is communicated with the square air bag (9) through a pipeline C (203), the square air bag (9) is arranged below a piston push plate, the travel switch (8) is arranged on the lower end face of the piston push plate corresponding to the square air bag (9), a one-way valve (12) is arranged on the pipeline B (202) and is connected with the two-position two-way electromagnetic directional valve (11), and the two-position two-way electromagnetic directional valve (11) is communicated with the pipeline C (203) through a pipeline D (204); the piston cylinder (10) is used for opening or closing the communication between the pipeline A (201) and the pipeline C (203) according to the pressure, and the two-position two-way electromagnetic directional valve (11) is electrically connected with the travel switch (8);

the rebound device comprises a spring A (5), the upper end of the spring A (5) is fixedly connected with the outer wall of the temperature sensing body (4), the spring A (5) is sleeved on the side wall of the temperature sensing body (4), and the lower end of the spring A (5) is fixedly connected with the fixing device.

2. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: the piston cylinder (10) comprises a piston (16) and a spring C (27), and the piston (16) is fixedly arranged between a communication port with the pipeline A (201) and a communication port with the pipeline C (203) through the spring C (27).

3. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: an air inlet valve (17) is arranged on the side wall of the lower chamber (13).

4. A thermostat based on a pneumatic transmission system as set forth in claim 3 wherein: the air inlet valve (17) comprises a rubber pad (18) with an I-shaped side section and a valve cover (20), a mounting hole is formed in the side wall of the lower cavity (13), the rubber pad (18) is slidably arranged in the mounting hole, and two air inlet holes (19) are formed in the side edge of the mounting hole.

5. A pneumatic drive system based thermostat according to claim 4 wherein: the periphery of the air inlet hole (19) is outwards extended with a connecting sleeve, and the connecting sleeve is used for being in threaded connection with a valve cover (20); the rubber pad (18) is positioned on the pad surface of the inner cavity of the lower chamber (13) and is used for blocking the two air inlets (19).

6. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: the pipeline C (203) is connected with the square air bag (9) through an automatic buckle, and an I-shaped air bag opening (21) provided with a circle of clamping grooves is fixed at the lower end of the square air bag (9); the automatic buckle comprises a steel ball (25), a spring B (22) and a buckle (26), wherein an air inlet wall (23) extends from the pipe orifice of the pipeline C (203), two through holes for placing the steel ball (25) are symmetrically formed in the air inlet wall (23), and the steel ball (25) can move left and right in the through holes through a gap between the steel ball and the through holes; the buckle (26) is sleeved on the outer side of the air inlet wall (23) in a sliding mode, a circle of connecting baffle is arranged at the lower end of the air inlet wall (23) in an extending mode, a spring B (22) is connected between the buckle (26) and the connecting baffle, and the spring B (22) is used for enabling the buckle (26) to upwards abut against the steel balls (25); the outer diameters of flanges at the upper end and the lower end of a clamping groove of the I-shaped air bag opening (21) are consistent with the inner diameter of the air inlet wall (23), the outer diameter of the two steel balls (25) with the smallest distance is larger than the inner diameter of the buckle (26), and the inner diameter of the two steel balls (25) with the largest distance is not smaller than the inner diameter of the air inlet wall (23).

7. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: the fixing device comprises an upper bracket (2), a lower bracket (3) and a valve seat (6), wherein the upper bracket (2) and the lower bracket (3) are hollow structures, and the upper bracket (2) is of a V-shaped structure with a downward opening; the lower end of the upper bracket (2) is fixedly connected with a valve seat (6), the lower end of the valve seat (6) is fixedly provided with a lower bracket (3), the valve seat (6) is used for being fixed with a water outlet pipeline, and the maximum inner diameter of the upper bracket (2) is smaller than the inner diameter of the valve seat (6); the upper end of the push rod (1) is fixedly connected with the upper bracket (2), the temperature sensing body (4) is fixed between the upper bracket (2) and the lower bracket (3) through connection with a piston push plate, an opening for the lower end of the temperature sensing body (4) to extend out is formed in the lower end of the lower bracket (3), and the lower end of the spring A (5) is fixed at the opening of the lower bracket (3) around the temperature sensing body (4); the thermostat valve (7) is sleeved on the temperature sensing body (4) and is positioned at the joint of the upper bracket (2) and the valve seat (6), the thermostat valve (7) is used for blocking the hollow structure of the upper bracket (2), and the outer diameter of the thermostat valve (7) is smaller than the inner diameter of the valve seat (6).

8. A pneumatic drive system based thermostat according to claim 7 wherein: the upper bracket (2) is also fixedly provided with a center rod (15), the center rod (15) is fixed at the center of the upper bracket (2), and the lower end of the center rod (15) penetrates through the piston push plate and is inserted into the temperature sensing body (4).

9. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: a cover and a sealing gasket (14) are arranged at the joint of the upper end of the piston push plate and the push rod (1).

10. A thermostat based on a pneumatic transmission system as set forth in claim 1 wherein: the lower end of the temperature sensing body (4) is provided with a connecting shaft (29), and the connecting shaft (29) is used for being connected with a lower baffle plate (28).