CN110657584A

CN110657584A - Thermosensitive element

Info

Publication number: CN110657584A
Application number: CN201910960839.2A
Authority: CN
Inventors: 谢庆俊
Original assignee: ZHUHAI CITY SUPREMA THERMOSTATIC SANITARY WARE CO Ltd
Current assignee: Shengyikang (Fujian) Technology Co.,Ltd.
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-01-07
Also published as: WO2021068475A1

Abstract

The invention provides a thermosensitive element, which consists of an integrated push rod, a guide body, a shell and a temperature sensing material sealed in the shell, wherein the integrated push rod penetrates through the inner surface of the guide body, a diaphragm at the tail end of the integrated push rod is clamped between the shell and the guide body, and the guide body and the shell are tightly connected to seal the temperature sensing material in the shell.

Description

Thermosensitive element

Technical Field

The invention relates to the technical field of temperature control, in particular to a thermosensitive element.

Background

In the conventional temperature control devices in the water heating equipment and bathroom field, the commonly used thermosensitive element generally consists of a shell, a temperature sensing material, a diaphragm, a guide body, a plunger, a gasket and a push rod, wherein the diaphragm, the plunger, the gasket and the push rod are independent parts. When the thermosensitive element is heated, the temperature sensing material in the shell expands due to heating to push the diaphragm, so that kinetic energy is guided to the plunger, and mechanical movement of the push rod is caused and displacement is generated. When the temperature drops, the temperature sensing material shrinks and the push rod returns.

In the mechanical movement of the plunger, the gasket and the push rod, the acting force between the plunger and the push rod and the gasket directly acts on one end surface of the plunger, so that the end surface of the plunger is abraded; in addition, the stress on the end face weakens the fatigue resistance of the plunger, so that the plunger is crushed or cracked, and the step face matched with the plunger in the guide body generates lateral acting force on the plunger, so that the plunger is crushed or cracked, and the displacement deviation or the function failure of the push rod is caused. Meanwhile, repeated acting force exists between the plunger and the diaphragm, so that the fatigue resistance of the diaphragm is weakened, the diaphragm is cracked and leaks wax, and the displacement deviation or the functional failure of the push rod is caused.

The above causes a reduction in the life of the thermosensitive element and a reduction in the temperature-sensing sensitivity of the thermosensitive element (i.e., the ability of the displacement of the push rod of the thermosensitive element to respond to a change in temperature).

Disclosure of Invention

In order to solve the above problems, it is a main object of the present invention to provide a thermosensitive element having a long life, high temperature sensitivity, and good stability.

In order to achieve the main object of the present invention, the present invention provides a thermosensitive element, which is composed of an integrated push rod, a guide body, a housing, and a temperature sensing material sealed in the housing, the integrated push rod penetrates through an inner surface of the guide body, a diaphragm at a tip of the integrated push rod is sandwiched between the housing and the guide body, and the guide body and the housing seal the temperature sensing material in the housing by being tightly connected.

The integrated push rod is composed of a push rod and a diaphragm, and the push rod and the diaphragm are structurally integrated.

The further proposal is that the push rod is provided with a plurality of concave-convex surfaces with different heights, so that the membrane can be more reliably combined with the push rod to form a whole.

Further preferably, the inner surface of the guide body, which is matched with the integrated push rod, is a straight surface.

Therefore, the thermosensitive element disclosed by the invention adopts the integrated push rod, so that the service life of the thermosensitive element is prolonged, and the temperature sensing sensitivity and stability of the thermosensitive element are improved.

Drawings

Fig. 1 is a sectional view of a conventional thermosensitive element.

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

Fig. 3 is a sectional view of a thermosensitive member of the present invention.

Fig. 4 is a first structural sectional view of the integrated push rod of the embodiment of the heat-sensitive element of the invention.

Fig. 5 is a first sectional view of a push rod of an embodiment of a heat-sensitive element of the present invention.

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

Fig. 7 is a second structural sectional view of the integrated push rod of the embodiment of the heat-sensitive element of the invention.

Fig. 8 is a third structural sectional view of the integrated push rod of the embodiment of the heat-sensitive element of the invention.

Fig. 9 is a fourth structural sectional view of the integrated push rod of the embodiment of the heat-sensitive element of the invention.

Fig. 10 is a sectional view showing a second structure of the push rod of the embodiment of the heat sensitive element of the present invention.

Fig. 11 is a sectional view of the heat sensitive member of the present invention applied to a shower faucet.

Fig. 12 is a sectional view taken along line a-a of fig. 11.

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

FIG. 14 is a schematic diagram of one test cycle period of the test apparatus.

Fig. 15 is a graph of time, temperature, pressure and flow during a test of faucet temperature stability.

Fig. 16 is a sectional view of the thermosensitive member of the present invention applied to a thermostatic cartridge.

Fig. 17 is a graph of the relationship of time, temperature, pressure, and flow during a test of temperature stability of the thermostatic cartridge.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

As shown in fig. 1, the thermosensitive element 1 shown in fig. 1 is a thermosensitive element which has been commonly used for over one hundred years, and is generally composed of a housing 11, a temperature sensing material 12, a diaphragm 13, a guide body 14, a plunger 15, a spacer 16, and a push rod 17, and the diaphragm 13, the plunger 15, the spacer 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 expands due to heating, and the diaphragm 13 is pushed to guide kinetic energy to the plunger 15, so that the push rod 17 is mechanically moved and displaced. When the temperature drops, the temperature sensing material 12 contracts 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 large stress is generated on the end face of the plunger 15, which causes the end face of the plunger 15 to be worn, chipped or cracked, and the push rod 17 to be displaced or to fail in function.

Meanwhile, repeated force is applied between the plunger 15 and the diaphragm 13, so that the fatigue resistance of the diaphragm 13 is weakened, and the diaphragm 13 is cracked and leaks wax. Resulting in a displacement deflection or a functional failure of the push rod 17.

In addition, fig. 2 shows an example of the guide body 14 of the conventional heat sensitive element 1, and a step surface 141 of the guide body 14, which is engaged with the plunger 15, may generate a lateral force on the plunger 15, causing the plunger 15 to be crushed or broken, thereby causing the displacement offset or the malfunction of the push rod 17.

The above factors all limit the service life of the conventional heat sensitive element 1.

Referring to fig. 3, fig. 3 is a specific example of the heat-sensitive element 2 of the present invention, and the heat-sensitive element 2 includes a housing 21, a temperature-sensitive material 22, a guide 23, and an integrated push rod 24, wherein the housing 21 has a receiving cavity 211, and the temperature-sensitive material 22 is disposed in the receiving cavity 211. The integrated push rod 24 penetrates 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 sensing material 22 is sealed in the accommodating cavity 211 of the housing 21.

Referring to fig. 4, fig. 4 is a specific example of the integrated push rod 24, the integrated push rod 24 includes a membrane 241 and a push rod 242, the membrane 241 and the push rod 242 are structurally integrated, for example, the membrane 241 and the push rod 242 can be formed into the integrated push rod 24 by a two-shot molding process, so that the membrane 241 and the push rod 242 are tightly combined together.

Referring to fig. 5, fig. 5 shows an embodiment of the push rod 242. The push rod 242 penetrates the inner surface 231 of the guide body 23, the lower end portion of the push rod 242 is provided with a plurality of

uneven surfaces

242a, 242b having different heights, the diaphragm 241 is provided with a plurality of uneven surfaces having different heights at the connection with the push rod 242, and the

uneven surfaces

242a, 242b and the uneven surface of the diaphragm 241 are coupled in a matching manner, so that the diaphragm 241 can be more reliably coupled with the push rod 242 to become the integrated push rod 24.

Referring to fig. 6, fig. 6 shows a specific example of the guide body 23. The inner surface 231 of the guide body 23 that engages with the integrated push rod 24 is a straight surface without steps.

As shown in fig. 3, when the heat-sensitive element 2 having the integrated push rod 24 is heated, the temperature-sensitive material 22 in the housing 21 expands to push the diaphragm 241, thereby causing mechanical movement and displacement of the integrated push rod 24. When the temperature drops, the temperature sensing material 22 contracts and the integrated push rod 24 returns.

The repeated acting force is generated between the push rod 242 and the membrane 241, and the concave-convex surfaces with different heights are formed between the push rod 242 and the membrane 241, so that the combination area between the push rod 242 and the membrane 241 is increased, the acting force between the push rod 242 and the membrane 241 is dispersed on a larger combination surface, the stress on the combination surface is reduced, the fatigue strength of the membrane 241 is improved, the service life of the membrane 241 is prolonged, and meanwhile, the combination between the membrane 241 and the push rod 242 is more reliable due to the larger combination area.

Because the integrated push rod 24 is adopted, 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 sensing sensitivity and the temperature control precision of the thermosensitive element 2 are improved.

In addition, the inner surface 231 of the guide body 23, which is matched with the integrated push rod 24, is a through surface, so that the lateral acting force of the inner surface 231 of the guide body 23 on the membrane 241 is eliminated, and the service life of the membrane 241 is prolonged.

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

The bathroom equipment with the thermosensitive element 2 with higher temperature control precision can lead the temperature of the outlet water of the equipment to change if the pressure (or temperature) of the supplied cold water and hot water changes in the using process, and the equipment can lead the temperature of the outlet water to be recovered to the set temperature in a shorter time under the quick response of the thermosensitive element 2.

When the supply of cold water (or hot water) is suddenly stopped during the use of the sanitary ware with the thermosensitive element 2 with higher temperature-sensing sensitivity, the hot water (or cold water) supplied by the sanitary ware is also closed in a short time under the quick response of the thermosensitive element 2, so that the scald (or frostbite) to people caused by the stop of the supply of cold water (or the stop of the supply of hot water) is avoided.

The present invention is not limited to the above-described embodiments, and simple replacement without creative efforts based on the above-described embodiments should fall within the scope of the present disclosure. Several integrated push rod 242 configurations as shown in fig. 7-10 are also within the scope of the present invention.

The following is an example of the application of the heat-sensitive element 2 of the invention in thermostatic shower faucets. The structure of the shower faucet is shown in fig. 11 to 13, fig. 11 is a sectional view of the shower faucet, fig. 12 is a sectional view taken along the direction A-A of fig. 11, and fig. 13 is a partial view of the shower faucet temperature control device.

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

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

the adjuster 33 is fixed to the thermo-sensitive element 2 by a screw. When the temperature (or flow) of hot inlet water is increased, the temperature of the mixed water is increased, the temperature sensing material 22 in the thermosensitive element 2 is expanded, the integrated push rod 24 is extended outwards, the regulator 33 is driven to move towards the hot inlet end 351, so that the gap of the hot inlet end 351 is reduced, and hot water supply is reduced; meanwhile, the clearance of the cold water inlet end 341 is increased, and the cold water supply is increased; the temperature of the mixed water is recovered to the original set temperature. And vice versa.

The following is a life test performed on this example:

firstly, the test conditions are set as follows:

A) the stroke of the testing device is set to be within (80-90)% of the temperature control stroke of the faucet and runs at an angular speed of (60 +/-6) °/sec.

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

Secondly, a test method comprises the following steps:

A) the faucet was connected to the test fixture.

B) The water outlet of the faucet is closed, and the water inlet pressure on the water supply loop is adjusted to be (0.4 +/-0.05) MPa.

C) The water outlet of the tap is opened, and the flow of the water outlet is adjusted to 4 liters/minute to 6 liters/minute when the water outlet temperature is 38 ℃.

D) One cycle period is: starting from the lowest temperature position of the discharged water, reaching the highest temperature position of the discharged water, and returning to the lowest temperature position of the discharged water. In each period, the two end positions of the lowest temperature and the highest temperature of the stroke stay for 5 seconds respectively. The test period was at least 50000 times.

FIG. 14 is a schematic diagram of a test cycle of the test apparatus.

The following are test results of the thermosensitive element 2 after more than 50000 cycles:

1. the temperature of the effluent is kept within the range of +/-2 ℃ of the initial set temperature;

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

3. the water yield does not exceed 200ml in the first 5 seconds and does not exceed 300ml in the last 30 seconds after the cold water is lost. And after the supply of the cold water is resumed, the outlet water temperature is within the range of +/-2 ℃ of the initial set temperature.

Tables 1 to 3 are test data of the temperature stability of the faucet after the life test:

1. variation of pressure

TABLE 1 Water temperature stability test-pressure Change

2. Temperature change

TABLE 2 stability test of leaving Water temperature-Change in Hot Water temperature

3. Loss of supply of cold water

TABLE 3 Cold Water loss test

4. Graph of the drawing

As shown in fig. 15, fig. 15 is a graph of the relationship of time, temperature, pressure and flow during the test of the temperature stability of the faucet. Wherein each curve is represented 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, temperature of the mixed water.

The following is an example of the application of the heat-sensitive element 2 of the invention in a thermostatic cartridge. The structure of the thermostat valve body is shown in fig. 16, and fig. 16 is a sectional view of the thermostat valve body.

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

the regulator 43 is fixed on the thermosensitive element 2 through threads, when hot water is increased, the water temperature of mixed water is increased, the temperature sensing material 22 in the thermosensitive element 2 is expanded, the integrated push rod 24 is extended, so that the thermosensitive element 2 drives the regulator 43 to move downwards together, the regulator 43 moves downwards, the water inlet gap 411 of the cold water inlet end at the upper end of the regulator 43 is increased, and the water inlet gap of the hot water inlet end 421 at the lower end of the regulator 43 is reduced, so that the water temperature of the mixed water is restored to the original set temperature. And vice versa.

The thermostatic valve core 4 is tested according to the service life testing method, and after 50000 circulation periods are exceeded, the testing result is as follows:

2. 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 requirement of +/-2 ℃ of the initial set temperature;

Tables 4 to 6 are test data of the temperature stability of the faucet after the life test:

1. variation of pressure

TABLE 4 temperature stability test of the effluent-pressure Change

2. Temperature change

TABLE 5 run-out temperature stability test-Hot Water temperature Change

3. Loss of supply of cold water

TABLE 6 Cold water loss test

4. Graph of the drawing

As shown in fig. 17, fig. 17 is a graph of the relationship of time, temperature, pressure, and flow rate during the test of the temperature stability of the thermostatic cartridge. Wherein each curve is represented 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, temperature of the mixed water.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.

Claims

1. A heat-sensitive element characterized by: the temperature sensing device comprises an integrated push rod, a guide body, a shell and a temperature sensing material sealed in the shell, wherein the integrated push rod penetrates through the inner surface of the guide body, a diaphragm at the tail end of the integrated push rod is clamped between the shell and the guide body, and the guide body and the shell are tightly connected to seal the temperature sensing material in the shell.

2. A thermosensitive member according to claim 1, wherein:

3. A thermosensitive member according to claim 2, wherein:

the push rod is provided with a plurality of concave-convex surfaces with different heights, so that the diaphragm can be more reliably combined with the push rod to form a whole.

4. A thermosensitive member according to claim 1, wherein:

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