Overtemperature protection valve

Abstract

The utility model discloses an overtemperature protection valve which comprises a valve body, a valve element, an ejector rod and a memory alloy spring. The valve body is provided with a hot water inlet, a cold water inlet, a liquid mixing cavity and a mixed water outlet which communicate with one another. The valve element is movably arranged in the liquid mixing cavity and comprises a valve element body and a valve element connecting rod extending from the valve element body to the hot water inlet, a hot water opening corresponding to the hot water inlet is formed in the valve element connecting rod, and a cold water opening corresponding to the cold water inlet is formed in the valve element body. The ejector rod is movably arranged in the liquid mixing cavity, abuts against the side, away from the valve element connecting rod, of the valve element body and is communicated with the valve element, and the ejector rod is communicated with the mixed water outlet. The memory alloy spring is arranged on the ejector rod in a sleeving mode and abuts against the valve element body. Compared with the prior art, the temperature control device is suitable for high-temperature media, and the temperature of the high-temperature media can be accurately controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of over-temperature protection valves, belong to valve technical field. BACKGROUND

[0002] In industrial and civil fields, thermostatic valves are widely used. Its basic function is to connect two-way medium of high and low temperature, and the mixed medium flows out from the drain port at constant temperature. The unique feature of thermostatic valve is that even if the inflow temperature and pressure of high and low temperature medium change, the temperature of outflow medium can remain constant.

[0003] In practical application, many scenes put forward special requirements for thermostatic valves. For example, in beverage brewing machine, the outlet water temperature is usually set at about 95℃ to meet the brewing requirements of most coffee beverages. However, when other tea or coffee needs to be brewed, the thermostatic temperature needs to be adjusted slightly within a certain range to meet the brewing requirements of different beverages. This application scenario requires the thermostatic valve to mainly use high temperature medium in most cases, and only when the high temperature medium appears over-temperature, a small amount of low temperature medium is added to maintain the constant temperature of the system.

[0004] However, the existing thermostatic valve technology has some problems and limitations in these application scenarios. On the one hand, many thermostatic valves have slow response speed to temperature change and low control accuracy, which cannot meet the process requirements sensitive to temperature, thereby affecting product quality and production efficiency. On the other hand, the adaptability of existing thermostatic valves is poor, and when facing different caliber, water pressure, flow and temperature requirements, the whole valve needs to be replaced, which undoubtedly increases the use cost and maintenance workload. SUMMARY

[0005] To solve the above technical problems, the utility model provides an over-temperature protection valve, which is suitable for high temperature medium and can accurately control its temperature.

[0006] The technical scheme of the utility model is:

[0007] An over-temperature protection valve, comprising:

[0008] A valve body having a hot water inlet, a cold water inlet, a mixed liquid chamber and a mixed water outlet in communication with each other;

[0009] A valve core movably arranged in the mixed liquid chamber, comprising a valve core body and a valve core connecting rod extending from the valve core body towards the hot water inlet, the valve core connecting rod being provided with a hot water inlet corresponding to the hot water inlet, and the valve core body being provided with a cold water inlet corresponding to the cold water inlet;

[0010] A top rod movably arranged in the mixed liquid cavity and abutting against one side of the valve core body away from the valve core connecting rod and penetrating the valve core, the top rod and the mixed water outlet penetrating each other;

[0011] A memory alloy spring sleeved on the top rod and abutting against the valve core body.

[0012] As a further improvement of the utility model, the over-temperature protection valve further comprises a reset spring, the reset spring is located between the valve core body and the hot water inlet, and one end of the reset spring abuts against the valve core body.

[0013] As a further improvement of the utility model, the valve body is provided with a limiting piece arranged close to the hot water inlet, and the reset spring is located between the valve core body and the limiting piece.

[0014] As a further improvement of the utility model, the limiting piece is provided with a through liquid passing hole, one end of the valve core connecting rod towards the hot water inlet is provided with a liquid passing part, and the liquid passing part can be driven to close the liquid passing hole.

[0015] As a further improvement of the utility model, the liquid passing part is a cone shape protruding towards the liquid passing hole.

[0016] As a further improvement of the utility model, the over-temperature protection valve has a high-temperature state and an over-temperature state, in the high-temperature state, the hot water inlet is always open, the cold water inlet is dislocated with the cold water outlet to be always closed, in the over-temperature state, the memory alloy spring is stretched to drive the valve core to move towards the hot water inlet to close the liquid passing hole by the liquid passing part, and the cold water inlet is at least partially aligned with the cold water outlet.

[0017] As a further improvement of the utility model, in the movement process of the valve core towards the hot water inlet, the amount of hot water from the hot water outlet gradually decreases, and the amount of cold water from the cold water outlet gradually increases.

[0018] As a further improvement of the utility model, the over-temperature protection valve further comprises a temperature adjusting piece at least partially located in the mixed liquid cavity, the top rod is connected with the temperature adjusting piece, and the memory alloy spring is located between the temperature adjusting piece and the valve core body.

[0019] As a further improvement of the utility model, the temperature adjusting piece is movably connected with the valve body and has a drivable part at least partially exposed outside the valve body, the drivable part can be activated to move towards the valve core, and then drive the valve core to move synchronously through the top rod.

[0020] As a further improvement of the utility model, the top rod is provided with a water outlet corresponding to the mixed water outlet, and the water outlet and the mixed water outlet are always in communication.

[0021] The beneficial technical effect of the utility model is: the over-temperature protection valve sets the hot water inlet corresponding to the hot water inlet on the valve core connecting rod, sets the cold water inlet corresponding to the cold water inlet on the valve core body, and abuts the top rod on the side of the valve core body away from the valve core connecting rod, and the top rod and the valve core are mutually penetrated, the top rod and the mixed water outlet are mutually communicated, the memory alloy spring is sleeved on the top rod and abuts the valve core body, so that the memory alloy spring is stretched after sensing high temperature, the valve core body is moved towards the hot water inlet, and the cold water inlet is opened, so that the temperature of the mixed water is controlled. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic view of the over-temperature protection valve of the preferred embodiment of the utility model.

[0023] Figure 2 It is Figure 1 It is the structure schematic view of the over-temperature protection valve hidden behind the valve body.

[0024] Figure 3 It is Figure 1 It is the sectional view of the over-temperature protection valve. DETAILED DESCRIPTION

[0025] In order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the specific embodiment of the utility model is further described in detail below, the following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0026] Please refer to Figures 1 to 3 The utility model discloses an over-temperature protection valve 100, including valve body 1 and valve core 2. The valve body 1 is corrosion resistance, high temperature resistance, wear resistance metal material or nonmetal material, and has hot water inlet 11, cold water inlet 12, mixed liquid cavity and mixed water outlet 13 that are mutually communicated.

[0027] The valve core 2 is movably arranged in the mixed liquid chamber, and includes a valve core body 201 and a valve core connecting rod 202 extending from the valve core body 201 towards the hot water inlet 11, the valve core connecting rod 202 being provided with a hot water outlet 21 corresponding to the hot water inlet 11, and the valve core body 201 being provided with a cold water outlet 22 corresponding to the cold water inlet 12. In the embodiment, the cold water outlet 22 is generally misaligned with the cold water inlet 12, so that the cold water inlet 12 is kept in a normally closed state, and the mixed liquid chamber is generally only communicated with hot water, so as to be suitable for high temperature environment.

[0028] The over-temperature protection valve 100 further includes a top rod 4 movably arranged in the mixed liquid chamber and abutting against a side of the valve core body 201 away from the valve core connecting rod 202, and penetrating through the valve core 2, the top rod 4 being in communication with the mixed water outlet 13. That is, the water flow direction is the hot water outlet 21, the valve core connecting rod 202, the valve core body 201, the top rod 3 and the mixed water outlet 13. Preferably, the top rod 4 is provided with a water outlet 41 corresponding to the mixed water outlet 13, and the water outlet 41 is always in communication with the mixed water outlet 13.

[0029] The over-temperature protection valve 100 further includes a memory alloy spring 3 sleeved on the top rod 4 and abutting against the valve core body 202. Generally, according to the parameter setting of the memory alloy spring 3, the temperature range that can be adapted is also different. In the embodiment, when the memory alloy spring 3 senses that the temperature of the liquid has exceeded the high temperature and reached the over-temperature, the memory alloy spring 3 starts to stretch and pushes the valve core body 201 to move, so that the cold water outlet 22 on the valve core body 201 is at least partially aligned with the cold water inlet 12, and then the cold water inlet 12 is in an open state. At this time, the liquid in the mixed liquid chamber is mixed water of hot water and cold water, and the hot water in the over-temperature state is cooled by the cold water, so as to be controlled within a certain temperature range.

[0030] In the embodiment, the memory alloy spring 3 is made of an alloy material with shape memory effect, the crystal grains of which are austenite in high temperature state, and the shear modulus and elastic modulus are relatively high; and the crystal grains are martensite in low temperature state, and the shear modulus and elastic modulus are relatively low. The elastic force of the memory alloy spring 3 in high temperature state is several times larger than that in low temperature state, so the memory alloy spring 3 can sense the temperature of the outside world and thus make a driving response.

[0031] The force value sensitivity of the memory alloy spring 3 to water temperature can reach 0.1 DEG C, that is, the force value can respond to the temperature difference change of 0.1 DEG C. And the response speed to the sharp change of water temperature is as high as 0.2 seconds, therefore, the memory alloy spring 3 is located between the valve core 2 and the mixed water outlet 13 in the over-temperature protection valve 100 of the utility model, the memory alloy spring 3 can directly contact the temperature of the mixed water to be discharged, the memory alloy spring 3 is used for accurately sensing and quickly responding to the outlet temperature of the mixed water, so that the accurate control of the outlet temperature of water is realized.

[0032] The over-temperature protection valve 100 further comprises a reset spring 5, the reset spring 5 is located between the valve core body 201 and the hot water inlet 11, and one end of the reset spring 5 abuts against the valve core body 201. That is, the reset spring 5 and the memory alloy spring 3 are located on the two sides of the valve core body 201 respectively. The position of the valve core body 201 is limited by the elastic force balance of the reset spring 5 and the memory alloy spring 3.

[0033] The valve body 1 is provided with a limiting piece 14 close to the hot water inlet 11, and the reset spring 5 is located between the valve core body 201 and the limiting piece 14. The limiting piece 14 is provided with a through liquid hole 141, and one end of the valve core connecting rod 202 towards the hot water inlet 11 is provided with a liquid passing part 23, and the liquid passing part 23 can be driven to close the liquid hole 141. That is, in the process that the valve core connecting rod 202 moves towards the hot water inlet 11 along with the valve core body 201, the liquid passing part 23 gradually extends into the liquid hole 141 and completely closes the liquid hole 141, at this time, the hot water inlet 11 is in a closed state, the cold water inlet 12 is in a normally open state, and the water inlet amount of the cold water inlet 12 reaches the maximum, so that the mixed water in the mixed liquid cavity can be quickly cooled to get rid of the over-temperature state.

[0034] In the embodiment, the liquid passing part 23 is a cone shape protruding towards the liquid hole 141. Through the design of the cone shape, the liquid passing part 23 can gradually enter the liquid hole 141, and the flow area of the liquid hole 141 is gradually reduced, that is, the hot water amount flowing through the liquid hole 141 is reduced. In other words, in the process that the valve core 2 moves towards the direction close to the hot water inlet 11, the hot water amount entering from the hot water inlet 11 is gradually reduced, and the cold water amount entering from the cold water inlet 12 is gradually increased.

[0035] Therefore, the over-temperature protection valve 100 has a high-temperature state and an over-temperature state. In the high-temperature state, the hot water inlet 11 is always open, and the cold water inlet 12 is misaligned with the cold water outlet 22 to be always closed. In the over-temperature state, the memory alloy spring 3 is stretched to push the valve core 2 to move towards the hot water inlet 11 to close the liquid passing hole 141 of the liquid passing part 23, and the cold water inlet 12 is at least partially aligned with the cold water outlet 22.

[0036] The over-temperature protection valve 100 further comprises a temperature adjusting member 6 at least partially located in the mixed liquid chamber. The top rod 4 is connected with the temperature adjusting member 6, and the memory alloy spring 3 is located between the temperature adjusting member 6 and the valve core body 4.

[0037] In the embodiment, the top rod 4 is movable relative to the valve body 1, that is, the top rod 4 can move towards the valve core body 201 to push the valve core 2 to move towards the hot water inlet 11, so that the cold water outlet 22 is at least partially aligned with the cold water inlet 12. Therefore, the top rod 4 can be an independent component or integrated with the temperature adjusting member 6, as long as the top rod 4 can be driven by the temperature adjusting member 6 to push the valve core body 201, and no limitation is made. Preferably, the temperature adjusting member 6 is a temperature adjusting knob, and the valve body 1 is internally provided with a threaded part 15. The temperature adjusting member 6 is correspondingly provided with a matching part 62. As long as the temperature adjusting member 6 is turned clockwise, the temperature adjusting member 6 can be controlled to move towards the hot water inlet 11, and then drive the top rod 4 to move synchronously. Of course, in other embodiments, other modes can also be provided, and no limitation is made.

[0038] Preferably, the water outlet 41 is provided with two groups of spaced apart, which can ensure that the water outlet 41 and the mixed water outlet 13 are always partially connected during the movement of the top rod 4.

[0039] The temperature adjusting member 6 is movably connected with the valve body 1 and has a drivable part 61 exposed at least partially outside the valve body 6, which can be activated to move towards the valve core 2, and then the valve core 2 is synchronously moved by the top rod 4. An end of the drivable part 61 exposed outside the valve body 1 is provided with a driving groove 610, which can be inserted by a tool to drive the drivable part 61 to rotate. In this way, the hot water inlet 11 can be manually closed directly to cool the liquid in the mixing chamber, which is different from the memory alloy spring 3. Therefore, the stretching length of the memory alloy spring 3 can be smaller than the moving distance of the temperature adjusting member 6. In this way, when the water temperature is automatically adjusted by the memory alloy spring 3, the hot water inlet 11 remains in an open state, and only the hot water amount is continuously reduced as the liquid passing part 23 extends into the liquid passing hole 141. Only when the temperature adjusting member 6 is manually driven, the hot water inlet 11 can be closed, so that only cold water flows into the mixing chamber at the same time. Of course, the maximum stretching length of the memory alloy spring 3 can be set to be equal to or greater than the moving distance of the temperature adjusting member 6. In this way, the hot water inlet 11 can also be closed when the water temperature is automatically adjusted by the memory alloy spring 3, which can be adjusted according to the actual situation, and is not limited.

[0040] In summary, the over-temperature protection valve 100 of the utility model through setting the hot water inlet 21 corresponding to the hot water inlet 11 on the valve core connecting rod 202, setting the cold water inlet 22 corresponding to the cold water inlet 12 on the valve core main body 201, abutting the top rod 4 on the side of the valve core main body 201 away from the valve core connecting rod 202 and penetrating the valve core 2, the top rod 4 and the mixed water outlet 13 are communicated, the memory alloy spring 3 is sleeved on the top rod 4 and abuts against the valve core main body 201, so that the memory alloy spring 3 is stretched and the valve core main body 201 is moved towards the hot water inlet 11 after sensing high temperature, and the cold water inlet 12 is opened to control the temperature of mixed water. In addition, by abutting the top rod 4 on the valve core main body 201, the valve core main body 201 can be forcibly pushed when the memory alloy spring 3 is not stretched, so as to artificially control the temperature. The over-temperature protection valve 100 of the utility model does not need external power supply and complex control signal, and can realize over-temperature protection only by the mechanical action of the memory alloy spring 3 and the valve core 2, which is simple in structure, high in reliability and stability. When different caliber, water pressure, flow and temperature requirements are adapted, the basic mechanism of the over-temperature protection valve does not need to be changed, only the memory alloy spring 3 and the reset spring 5 need to be replaced, which is low in cost and simple in operation.

[0041] The above merely is preferred implementation manner of the present application, and is not used for limiting the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the technical principle of the present application, can also make several improvements and variations, these improvements and variations also should be regarded as the protection scope of the present application.

Claims

1. An over-temperature protection valve, characterized in that, include: The valve body has interconnected hot water inlet, cold water inlet, mixing chamber and mixing outlet; The valve core is movably disposed in the mixing chamber and includes a valve core body and a valve core connecting rod extending from the valve core body toward the hot water inlet. The valve core connecting rod is provided with a hot water inlet corresponding to the hot water inlet, and the valve core body is provided with a cold water inlet corresponding to the cold water inlet. A push rod is movably disposed in the mixing chamber and abuts against the side of the valve core body opposite to the valve core connecting rod, and communicates with the valve core. The push rod is also connected to the mixing outlet. A shape memory alloy spring is sleeved on the top rod and abuts against the valve core body.

2. The over-temperature protection valve according to claim 1, characterized in that, The over-temperature protection valve also includes a reset spring, which is located between the valve core body and the hot water inlet, and one end of the reset spring abuts against the valve core body.

3. The over-temperature protection valve according to claim 2, characterized in that, The valve body is provided with a limiting member located near the hot water inlet, and the reset spring is located between the valve core body and the limiting member.

4. The over-temperature protection valve according to claim 3, characterized in that, The limiting member is provided with a through liquid passage hole, and the end of the valve core connecting rod facing the hot water inlet is provided with a liquid passage part, which can be driven to close the liquid passage hole.

5. The over-temperature protection valve according to claim 4, characterized in that, The liquid-passing section is a cone-shaped part that protrudes towards the liquid-passing hole.

6. The over-temperature protection valve according to claim 4, characterized in that, The over-temperature protection valve has a high-temperature state and an over-temperature state. In the high-temperature state, the hot water inlet is normally open, and the cold water inlet is misaligned with the cold water outlet to be normally closed. In the over-temperature state, the shape memory alloy spring is stretched to push the valve core to move towards the direction of the hot water inlet to the liquid passage part to close the liquid passage hole, and the cold water inlet is at least partially aligned with the cold water outlet.

7. The over-temperature protection valve according to claim 6, characterized in that, As the valve core moves toward the direction closer to the hot water inlet, the amount of hot water entering from the hot water inlet gradually decreases, while the amount of cold water entering from the cold water inlet gradually increases.

8. The over-temperature protection valve according to claim 1, characterized in that, The over-temperature protection valve also includes a temperature regulating element located at least partially within the mixing chamber, the push rod being connected to the temperature regulating element, and the shape memory alloy spring being located between the temperature regulating element and the valve core body.

9. The over-temperature protection valve according to claim 8, characterized in that, The temperature regulating element is movably connected to the valve body and has a driveable part that is at least partially exposed to the outside of the valve body. The driveable part can be activated to move toward the valve core, thereby driving the valve core to move synchronously via the push rod.

10. The over-temperature protection valve according to claim 1, characterized in that, The top rod is provided with an outlet corresponding to the mixing outlet, and the outlet and the mixing outlet are always in communication.

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