WO2021068475A1

WO2021068475A1 - Thermosensitive element

Info

Publication number: WO2021068475A1
Application number: PCT/CN2020/084821
Authority: WO
Inventors: 谢庆俊
Original assignee: 珠海市舒丽玛温控卫浴设备有限公司
Priority date: 2019-10-09
Filing date: 2020-04-15
Publication date: 2021-04-15
Also published as: CN110657584A

Abstract

A thermosensitive element (2), which is composed of an integrated push rod (24), a guide body (23), a housing (21) and a temperature-sensitive material (22) sealed in the housing (21). The integrated push rod (24) penetrates an inner surface of the guide body (23). A diaphragm (241) at an end of the integrated push rod (24) is sandwiched between the housing (21) and the guide body (23). The guide body (23) and the housing (21) are tightly connected so as to seal the temperature-sensitive material (22) in the housing (21).

Description

A thermal element

Technical field

The present invention is based on the Chinese patent with the patent number 201910960839.2, titled "a kind of thermal element". The invention relates to the technical field of temperature control, in particular to a thermal element.

Background technique

In the temperature control equipment in the field of plumbing equipment and sanitary ware, the commonly used heat-sensitive elements are usually composed of shell, temperature-sensitive material, diaphragm, guide body, plunger, gasket and push rod, and the diaphragm, The plunger, gasket and push rod are separate parts. When the heat-sensitive element is heated, the thermal expansion of the temperature-sensitive material in the shell pushes the diaphragm to guide the kinetic energy to the plunger, which causes the mechanical movement of the push rod and produces displacement. When the temperature drops, the temperature-sensitive material shrinks and the push rod returns.

In the mechanical movement of the plunger, shim, and push rod, the force between the plunger, push rod, and shim directly acts on one end of the plunger, causing wear on the end of the plunger; stress on the other end The fatigue strength of the plunger is weakened, causing the plunger to be fragmented or broken. The stepped surface in the guide body and the plunger also exerts a lateral force on the plunger, which causes the plunger to fragment or rupture, thereby causing the displacement of the plunger to deviate. Move or function failure. At the same time, there is a repeated force between the plunger and the diaphragm, which causes the fatigue resistance of the diaphragm to weaken, causing the diaphragm to rupture and wax leakage, which causes the displacement of the push rod or functional failure.

The above reasons will reduce the service life of the thermal element, and at the same time reduce the temperature sensitivity of the thermal element (that is, the ability of the displacement of the push rod of the thermal element to respond to changes in temperature).

technical problem

The main purpose of the present invention is to provide a thermal element with long service life, high temperature sensitivity and good stability.

Technical solutions

In order to achieve the main purpose of the present invention, the present invention provides a heat-sensitive element, which is composed of an integrated push rod, a guide body, a shell and a temperature-sensitive material sealed in the shell, and the integrated push rod penetrates the inner surface of the guide body. , The diaphragm at the end of the integrated push rod is sandwiched between the housing and the guide body, and the guide body and the housing are tightly connected to seal the temperature-sensitive material in the housing.

A further solution is that the integrated push rod is composed of a push rod and a diaphragm, and the push rod and the diaphragm are structured as a whole.

A further solution is that the push rod has multiple uneven surfaces with different heights, so that the diaphragm can be more reliably combined with the push rod to form a whole.

A further preferred solution is that the inner surface of the guide body matched with the integrated push rod is a straight surface.

Beneficial effect

The thermosensitive element provided by the present invention adopts an integrated push rod for its push rod, which not only improves the service life of the thermosensitive element, but also improves the temperature sensitivity and stability of the thermosensitive element.

Description of the drawings

Fig. 1 is a cross-sectional view of a conventional thermal element.

Fig. 2 is a cross-sectional view of a guide body of a conventional thermosensitive element.

Fig. 3 is a cross-sectional view of the thermal element of the present invention.

4 is a cross-sectional view of the first structure of the integrated push rod of the embodiment of the thermal element of the present invention.

Fig. 5 is a first cross-sectional view of the push rod of the embodiment of the thermal element of the present invention.

Fig. 6 is a cross-sectional view of a guide body of an embodiment of the thermosensitive element of the present invention.

Fig. 7 is a cross-sectional view of the second structure of the integrated push rod of the thermal element embodiment of the present invention.

Fig. 8 is a third structural cross-sectional view of the integrated push rod of the thermal element embodiment of the present invention.

Fig. 9 is a fourth structural cross-sectional view of the integrated push rod of the embodiment of the thermal element of the present invention.

10 is a cross-sectional view of the second structure of the push rod of the thermal element embodiment of the present invention.

Figure 11 is a cross-sectional view of the thermal element of the present invention applied to a shower faucet.

Fig. 12 is a cross-sectional view taken along the line A-A in Fig. 11.

Fig. 13 is a partial view of a cross-sectional view of the shower faucet of the present invention.

Fig. 14 is a schematic diagram of a test cycle of the test device.

Figure 15 is the pressure change data table in the faucet outlet temperature stability test.

Figure 16 is the hot water temperature change data table in the faucet outlet temperature stability test.

Figure 17 is the test data table of the cold water loss of the faucet.

Figure 18 is a diagram showing the relationship between time, temperature, pressure and flow during the temperature stability test of the faucet.

Figure 19 is a cross-sectional view of the thermosensitive element of the present invention applied to a thermostatic valve core.

Figure 20 is a data table of pressure changes in the temperature stability test of the thermostatic valve core outlet water temperature.

Figure 21 is a data table of hot water temperature changes in the thermostatic valve core outlet temperature stability test.

Figure 22 is the test data table of the thermostatic valve core cold water loss test.

Figure 23 is a graph of the relationship between time, temperature, pressure and flow during the temperature stability test of the thermostatic valve core.

The present invention will be further described below with reference to the drawings and embodiments.

Embodiments of the present invention

As shown in Figure 1, the thermal element 1 shown in Figure 1 is a thermal element that has been commonly used for more than one hundred years. It usually consists of a housing 11, a temperature-sensitive material 12, a diaphragm 13, a guide body 14, and a plunger. 15. The gasket 16 and the push rod 17 are composed, and the diaphragm 13, the plunger 15, the gasket 16 and the push rod 17 are each independent parts. When the heat-sensitive element 1 is heated, the temperature-sensitive material 12 in the housing 11 is heated and expands, pushing the diaphragm 13 to guide the kinetic energy to the plunger 15, thereby causing the push rod 17 to move mechanically and produce displacement. When the temperature drops, the temperature-sensitive material 12 shrinks, and the push rod 17 returns. Since the force between the plunger 15 and the push rod 17, and the gasket 16 directly acts on one end face of the plunger 15, a relatively large stress is generated on the end face of the plunger 15, resulting in wear and tear on the end face of the plunger 15. Fragmentation or rupture causes the displacement of the push rod 17 or the function failure.

At the same time, there is repeated force between the plunger 15 and the diaphragm 13, which causes the fatigue resistance of the diaphragm 13 to weaken, causing the diaphragm 13 to rupture and leak wax. As a result, the displacement of the push rod 17 is shifted or the function fails.

In addition, FIG. 2 is an example of the guide body 14 of the ordinary heat-sensitive element 1. The stepped surface 141 of the guide body 14 that cooperates with the plunger 15 will generate a lateral force on the plunger 15 and cause the plunger 15 to be broken. Or rupture, resulting in displacement of the push rod 17 or functional failure.

The above factors limit the service life of the ordinary thermal element 1.

3, FIG. 3 is a specific example of the thermal element 2 of the present invention. The thermal element 2 includes a housing 21, a temperature-sensitive material 22, a guide body 23, and an integrated push rod 24, wherein the housing 21 has a housing In the cavity 211, the temperature-sensitive material 22 is arranged in the containing cavity 211. The integrated push rod 24 passes through the inner surface of the guide body 23, and the diaphragm 241 at the end of the integrated push rod 24 is sandwiched between the housing 21 and the guide body 23, and the guide body 23 and the housing 21 are tightly connected Preferably, the guide body 23 and the housing 21 are tightly riveted, so that the temperature-sensitive material 22 is sealed in the accommodating cavity 211 of the housing 21.

With reference to Figure 4, Figure 4 is a specific example of the integrated push rod 24. The integrated push rod 24 includes a diaphragm 241 and a push rod 242. The diaphragm 241 and the push rod 242 are structured as a whole, for example, can pass through two The second injection molding process forms the diaphragm 241 and the push rod 242 into an integrated push rod 24 so that the diaphragm 241 and the push rod 242 are tightly combined.

In conjunction with FIG. 5, FIG. 5 is a specific example of the push rod 242. The push rod 242 penetrates the inner surface 231 of the guide body 23, the lower end of the push rod 242 is provided with a plurality of uneven surfaces 242a, 242b of different heights, and the diaphragm 241 is provided with a plurality of uneven surfaces of different heights at the connection with the push rod 242 On the surface, the uneven surfaces 242a, 242b and the uneven surface of the diaphragm 241 are matched and combined, so that the diaphragm 241 can be more reliably combined with the push rod 242 to become an integrated push rod 24.

In conjunction with FIG. 6, FIG. 6 is a specific example of the guide body 23. The inner surface 231 of the guide body 23 that cooperates with the integrated push rod 24 is a straight surface without steps.

As shown in FIG. 3, when the thermosensitive element 2 with the integrated push rod 24 is heated, the temperature-sensitive material 22 in the housing 21 expands and pushes the diaphragm 241, thereby causing the integrated push rod 24 to mechanically move and produce displacement. When the temperature drops, the temperature-sensitive material 22 shrinks and the integrated push rod 24 returns.

There is a repeated force between the push rod 242 and the diaphragm 241. Since the push rod 242 and the diaphragm 241 have uneven surfaces with different heights, the combined area between the push rod 242 and the diaphragm 241 is increased, so that the push rod The force between the 242 and the diaphragm 241 is dispersed on a larger bonding surface, reducing the stress on the bonding surface, improving the fatigue strength of the diaphragm 241, extending the service life of the diaphragm 241, and achieving greater bonding. The area makes the connection between the diaphragm 241 and the push rod 242 more reliable.

Due to the integrated push rod 24, the structure of the thermosensitive element 2 is simplified, the parts are tightly combined, the loss of kinetic energy transmission is reduced, and the temperature sensitivity and temperature control accuracy of the thermosensitive element 2 are improved.

In addition, the inner surface 231 of the guide body 23 that cooperates with the integrated push rod 24 is a straight surface, which eliminates the lateral force of the inner surface 231 of the guide body 23 on the diaphragm 241 and prolongs the service life of the diaphragm 241.

In summary, the thermal element 2 with the integrated push rod 24 has a longer service life, better temperature sensitivity and temperature control accuracy.

If the pressure (or temperature) of the cold and hot water supplied to the bathroom equipment with higher temperature control accuracy thermosensitive element 2 changes during use, the temperature of the water outlet of the equipment changes, and the thermosensitive element 2 responds quickly The equipment can restore the temperature of the outlet water to the set temperature in a shorter time.

If the supply of cold water (or hot water) suddenly stops supplying during the use of sanitary equipment with higher temperature sensitivity and thermal element 2, the equipment will supply hot water in a short time under the rapid response of thermal element 2. (Or cold water) is also turned off to avoid burns (or frostbite) caused by the stop of cold water (or hot water).

The present invention is not limited to the above-mentioned embodiments, and simple replacements based on the above-mentioned embodiments without creative work should fall within the scope of the present invention. The structures of several integrated push rods 242 as shown in FIGS. 7 to 10 also belong to the scope of the present invention.

The following is an application example of the thermosensitive element 2 of the present invention in a thermostatic shower faucet. The structure of the shower faucet is shown in Figs. 11 to 13, Fig. 11 is a cross-sectional view of the shower faucet, Fig. 12 is a cross-sectional view along the line A-A of Fig. 11, and Fig. 13 is a partial view of the temperature control device of the shower faucet.

The shower faucet 3 has a cold water inlet 31, a hot water inlet 32, a regulator 33, a cold water inlet 34, a hot water inlet 35, a mixed water outlet 36, a return spring 37 and a heat sensitive element 2. The cold water inlet 31 is used to connect with the cold water pipe, the hot water inlet 32 is used to connect with the hot water pipe, the cold water in the cold water pipe flows into the shower faucet 3 through the cold water inlet 34, and the hot water in the hot water pipe flows into the shower through the hot water inlet 35 Inside the faucet 3, cold water and hot water are mixed at the heat-sensitive element 2.

The working principle of constant temperature is briefly described as follows:

The regulator 33 is fixed on the heat-sensitive element 2 by threads. When the temperature (or flow) of the hot water inlet increases, the temperature of the mixed water increases, the temperature-sensitive material 22 in the thermosensitive element 2 expands, and the integrated push rod 24 extends outward, driving the regulator 33 to the hot water inlet end. The movement of 351 causes the gap of the hot water inlet 351 to be reduced, which reduces the hot water supply; at the same time, the gap of the cold water inlet 341 is increased, which increases the cold water supply; the temperature of the mixed water is restored to the original set temperature . vice versa.

The following is a life test for this example:

1. The test conditions are set as follows:

A) The stroke of the test device is set to within (80-90)% of the temperature control stroke of the faucet, and it runs at an angular velocity of (60±6)°/sec.

B) The hot water inlet temperature of the test device is (65+2/-5)℃, and the cold water inlet temperature is not higher than 30℃.

2. Test method:

A) Connect the faucet to the test device.

B) Turn off the water outlet of the faucet and adjust the inlet water pressure on the water supply loop to (0.4±0.05) MPa.

C) Turn on the water outlet of the faucet, and when the temperature of the water outlet is 38°C, adjust the flow rate of the water outlet to 4 liters/min to 6 liters/min.

D) A cycle cycle is: starting from the lowest temperature position of the water outlet, to the highest temperature position of the water outlet, and then back to the lowest temperature position of the water outlet. In each cycle, the two end positions of the lowest temperature and the highest temperature of the journey stay for 5 seconds each. The test cycle is at least 50,000 times.

Fig. 14 is a schematic diagram of a test cycle of the test device.

The following are the test results of the thermal element 2 after more than 50,000 cycles:

1. The outlet water temperature is kept within the range of ±2℃ from the initial set temperature;

2. Reach the requirement that when the pressure of cold inlet water (or hot inlet water) is reduced from 0.3MPa to 0.2MPa, the outlet water temperature does not exceed the initial set temperature ±2℃;

3. It meets the requirement that the water output in the first 5 seconds does not exceed 200ml and the water output in the next 30 seconds does not exceed 300ml after the cold water supply is lost. And after the supply of cold water is restored, the outlet water temperature is within the range of the initial set temperature ± 2°C.

Figure 15 to Figure 17 are the test data of the temperature stability of the faucet after the life test:

1. Pressure changes

The pressure change data is shown in Figure 15. Figure 15 is the pressure change data table in the faucet water temperature stability test.

2. Temperature change

Please refer to Figure 16 for the temperature change data. Figure 16 is the hot water temperature change data table in the faucet outlet temperature stability test.

3. Loss of cold water supply

Please refer to Figure 17 for the data of cold water loss of supply.

4. Curve graph

As shown in Figure 18, Figure 18 is a diagram of the relationship between time, temperature, pressure and flow during the test of the temperature stability of the faucet. Among them, the curves are expressed as follows:

Curve A1, hot water pressure;

Curve A2, cold water pressure;

Curve A3, mixed water flow;

Curve A4, hot water temperature;

Curve A5, cold water temperature;

Curve A6, mixed water temperature.

The following is an application example of the thermosensitive element 2 of the present invention in a thermostatic valve core. The structure of the thermostatic valve core is shown in Figure 19, which is a cross-sectional view of the thermostatic valve core.

The thermostatic valve core 4 has a cold water inlet 41, a hot water inlet 42, a regulator 43, a return spring 44 and a heat sensitive element 2. The cold water flowing into the thermostatic valve core 4 from the cold water inlet 41 and the hot water inlet 42 flows in The hot water in the thermostatic valve core 4 is mixed at the thermal element 2. The working principle of the thermostatic valve core is as follows:

The regulator 43 is fixed on the heat-sensitive element 2 by threads. When the hot water increases, the temperature of the mixed water increases, the temperature-sensitive material 22 in the heat-sensitive element 2 expands, and the integrated push rod 24 elongates, resulting in the heat-sensitive element 2 Drive the regulator 43 to move downward together. The downward movement of the regulator 43 increases the water inlet gap of the cold water inlet end 411 at the upper end of the regulator 43 and reduces the water inlet gap of the hot water inlet end 421 at the lower end of the regulator 43. Is too small, causing the water temperature of the mixed water to return to the original set temperature. vice versa.

The thermostatic valve core 4 is tested according to the above-mentioned life test method. After more than 50,000 cycles, the test results are:

2. When the cold inlet water (or hot inlet water) pressure is reduced from 0.3mpa to 0.2mpa, the outlet temperature does not exceed the initial set temperature ±2℃;

3. After the cold water supply is lost, the water output in the first 5 seconds should not exceed 200ml, and the water output in the next 30 seconds should not exceed 300ml. And after the supply of cold water is restored, the outlet water temperature is within the range of the initial set temperature ± 2°C.

Figure 20 to Figure 22 are the test data of the temperature stability of the thermostatic valve core after the life test:

1. Pressure changes

Please refer to Figure 20 for the pressure change data. Figure 20 is the pressure change data table in the thermostatic valve core water temperature stability test.

2. Temperature change

Please refer to Figure 21 for the temperature change data. Figure 21 is the hot water temperature change data table in the thermostatic valve core water temperature stability test.

3. Loss of cold water supply

Please refer to Figure 22 for the data of the loss of cold water supply. Figure 22 is the test data table for the loss of cold water supply of the thermostatic valve core.

4. Curve graph

As shown in Figure 23, Figure 23 is a diagram of the relationship between time, temperature, pressure and flow during the temperature stability test of the thermostatic valve core. Among them, the curves are expressed as follows:

Curve A7, hot water pressure;

Curve A8, cold water pressure;

Curve A9, mixed water flow;

Curve A10, hot water temperature;

Curve A11, cold water temperature;

Curve A12, mixed water temperature.

Finally, it should be emphasized that the above descriptions are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Within the principle of sum, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

工业性应用Industrial applications

The invention is applied to the technical field of sanitary equipment, such as thermostatic shower faucets. Through the structural design of the thermosensitive element, the invention makes the structure of the thermosensitive element simpler, the internal parts of the thermosensitive element are tightly combined, and the transmission of kinetic energy is reduced. Loss, the temperature sensitivity and temperature control accuracy of the thermal element are improved. In addition, the integrated push rod design of the thermal element can also effectively extend the service life of the diaphragm, thereby increasing the overall service life of the thermal element. The sanitary equipment using the thermal element can be distinguished from the existing sanitary equipment, so that the sanitary equipment provided with the thermal element of the present invention can restore the temperature of the outlet water to the set temperature in a shorter period of time, and act as a sanitary ware. When the supply of cold water (or hot water) suddenly stops supplying during the use of the equipment, the rapid response of the thermal element 2 enables the sanitary equipment to shut off the hot water (or cold water) supply in a short time, avoiding the cause Stopping the supply of cold water (or stopping the supply of hot water) causes burns (or frostbite) to people.

Claims

A thermal element, which is characterized in that it is composed of an integrated push rod, a guide body, a shell and a temperature-sensitive material sealed in the shell, the integrated push rod passes through the inner surface of the guide body, and the end of the integrated push rod The diaphragm is sandwiched between the casing and the guide body, and the guide body and the casing are tightly connected to seal the temperature-sensitive material in the casing.
The thermal element according to claim 1, wherein:

The integrated push rod is composed of a push rod and a diaphragm, and the push rod and the diaphragm are structured as a whole.
The thermal element according to claim 2, characterized in that:

The push rod has multiple uneven surfaces with different heights, so that the diaphragm can be more reliably combined with the push rod to form a whole.
The thermal element according to claim 1, wherein:

The inner surface of the guide body matched with the integrated push rod is a straight surface.