An infrared temperature detection device for washing machine

Abstract

The invention discloses an infrared temperature detection device for a washing machine, the washing machine comprising an inner drum and an outer drum with a window; the detection device comprises an infrared temperature sensor and a fan fixedly connected to the outer side wall of the outer drum, and a protective cover slidably connected to the outer drum and used to close the window; when the protective cover does not close the window, the infrared temperature sensor and the fan are directed toward the inner drum through the window; compared with the traditional method of arranging a temperature sensor at an air duct outlet, the temperature obtained by the invention is more accurate and more timely, so that the deformation of clothes caused by excessively high air temperature in the inner drum during heating can be prevented, and energy can be saved.

Description

Technical Field

[0001] The invention relates to the field of washing machines, and in particular to an infrared temperature detection device for washing machines. Background Art

[0002] In today's society, washing machines have become an indispensable part of every family. The continuous rainy season and cold weather have greatly increased people's demand for all-in-one washing and drying machines. The emergence of all-in-one washing and drying machines allows users to perform both washing and drying operations. Users no longer need to dry clothes outdoors, reducing the situation of clothes not drying in time and producing odor during the rainy season.

[0003] Traditional all-in-one washing and drying machines have a temperature sensor installed at the air outlet of the drying channel to detect the air temperature in the inner drum. When drying, the air in the inner drum needs to pass through the outer drum to the dehumidification pipe, and then through the drying channel to the air outlet of the drying channel. The temperature sensor detects the temperature and feeds it back to the computer board, which determines whether to continue heating. Since there is air between the outer drum and the inner drum, in the dehumidification pipe, and in the drying channel components, it takes a while for the air in the drum to reach the temperature sensor, which will cause the temperature detection in the inner drum to be delayed. The actual heating temperature exceeds the preset temperature, causing the clothes to deform and the heating time to be too long. When cooling after the drying program is completed, the temperature detection in the inner drum will also be delayed, and the fan operation time in the drying channel will be extended, resulting in energy waste. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an infrared temperature detection device for a washing machine.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An infrared temperature detection device for a washing machine, the washing machine comprising an inner drum and an outer drum with a window; the detection device comprising an infrared temperature sensor and a fan fixedly connected to the outer side wall of the outer drum, and a protective cover slidably connected to the outer drum and used to close the window; when the protective cover does not close the window, the infrared temperature sensor and the fan are directed toward the inner drum through the window.

[0007] Furthermore, it includes a slide rail fixed on the outer cylinder, a spring with one end fixedly connected to the outer cylinder, and a tractor; the protective cover is arranged in the slide rail, the other end of the spring is fixedly connected to one end of the protective cover, and the tractor is fixedly connected to the other end of the protective cover.

[0008] Furthermore, a through hole is provided on the protective cover, and the through hole and the window form a detection channel; when the tractor pulls the protective cover and makes the through hole overlap with the window, the detection channel is opened; when the through hole and the window do not overlap, the detection channel is closed.

[0009] Furthermore, the fan is located outside the infrared temperature sensor, so that the infrared temperature sensor is in the wind path of the fan.

[0010] Furthermore, the washing machine also includes a drying system for heating the cold air between the outer drum and the inner drum, and a door seal for introducing the hot air output by the drying system into the inner drum, and a vent hole is opened on the wall of the inner drum.

[0011] Compared with the prior art, the beneficial technical effects of the present invention are:

[0012] 1. Since the inner drum is in direct contact with the clothes and is made of metal, it has good thermal conductivity. The wall temperature of the drum is roughly the same as the air temperature in the drum. By setting an infrared temperature sensor on the outer drum of the drum washing machine to detect the surface temperature of the inner drum of the washing machine, the air temperature of the inner drum during the drying process can be accurately and timely detected. Compared with the traditional method of setting a temperature sensor at the air outlet of the air duct, the temperature obtained by the present invention is more accurate and more timely, which prevents the deformation of clothes caused by excessively high air temperature in the inner drum during the heating process and can save energy.

[0013] 2. When measuring the temperature of the inner cylinder, the tractor pulls the protective cover to open the detection channel composed of the window and the through hole. At the same time, the fan blows away the water vapor in the detection channel to prevent the infrared temperature sensor from being unable to directly measure the inner cylinder temperature due to the obstruction of water vapor. The fan power needs to be strictly controlled to avoid temperature measurement deviation due to excessive air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the protective cover of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the infrared temperature detection device of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the fan of the present invention. DETAILED DESCRIPTION

[0018] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0019] Traditional all-in-one washing and drying machines have a temperature sensor installed at the air outlet of the drying channel to detect the air temperature in the inner drum. When drying, the air in the inner drum needs to pass through the outer drum to the dehumidification pipe, and then through the drying channel to the air outlet of the drying channel. The temperature sensor detects the temperature and feeds it back to the computer board, which determines whether to continue heating. Since there is air between the outer drum and the inner drum, in the dehumidification pipe, and in the drying channel components, it takes a while for the air in the drum to reach the temperature sensor, which will cause the temperature detection in the inner drum to be delayed. The actual heating temperature exceeds the preset temperature, causing the clothes to deform and the heating time to be too long. When cooling after the drying program is completed, the temperature detection in the inner drum will also be delayed, and the fan operation time in the drying channel will be extended, resulting in energy waste.

[0020] like Figure 1-4 As shown, the present invention provides an infrared temperature detection device for a washing machine, the washing machine comprises an inner drum 30 and an outer drum 20 with a window; the detection device comprises an infrared temperature sensor and a fan 15 fixedly connected to the outer side wall of the outer drum, and a protective cover 12 slidably connected to the outer drum and used to close the window; when the protective cover does not close the window, the infrared temperature sensor and the fan are directed toward the inner drum through the window.

[0021] Infrared temperature sensors have been widely used in temperature measurement, but have never been used in the temperature measurement of drum washing machines, especially the temperature measurement of the inner drum wall. The reason is that technical personnel in this field have always had such technical constraints: it is impossible to find a suitable installation position for the infrared sensor to ensure the service life of the infrared sensor in a high temperature and high humidity environment. In addition, it is also impossible to solve the problem of accurate temperature measurement of the infrared sensor in a high humidity drum washing machine. Therefore, the infrared temperature measurement method has not been integrated into the temperature measurement technology of the drum washing machine.

[0022] The starting point of the inventive concept of the present invention is to utilize the characteristics that the inner drum is in direct contact with the clothes and is made of metal. The surface temperature of the inner drum is roughly the same as the temperature of the air in the inner drum. Since the heat conduction speed of metal is fast, there is a small delay in the change of the surface temperature of the inner drum and the temperature of the air in the inner drum. If the temperature of the inner drum can be measured, the temperature of the air in the inner drum can be measured accurately and timely. The present invention uses a series of technical means to ensure the service life and temperature measurement environment of the infrared temperature sensor on the basis of the starting point of the above-mentioned invention concept: 1. A window for temperature measurement is opened on the wall of the outer cylinder, and the positional relationship between the through hole on the protective cover and the window is used to realize the opening and closing of the detection channel, so that the infrared temperature sensor is relatively isolated from the inner cylinder, the detection channel is opened during temperature measurement, and the detection channel is closed after temperature measurement. The sensor has a shorter connection time with the high temperature and high humidity environment, and can prevent the splashing of foam and water stains during washing or rinsing, thereby improving the service life of the infrared temperature sensor; 2. A fan is used to form an air path toward the detection channel to avoid the influence of water vapor on the temperature measurement accuracy. In addition, technicians in this field can determine the appropriate fan speed through multiple experiments to avoid the influence of excessive wind speed on temperature measurement.

[0023] The wiring harness used by the infrared temperature sensor is an electromagnetic shielding harness, which can avoid measurement errors caused by electromagnetic interference inside and outside the washing machine.

[0024] The fan can run independently and does not need to be started at the same time as the infrared temperature sensor.

[0025] like Figure 2 As shown, it includes a slide rail fixed on the outer cylinder, a spring 16 whose one end is fixedly connected to the outer cylinder, and a tractor 13; the protective cover is arranged in the slide rail, the other end of the spring is fixedly connected to one end of the protective cover, and the tractor is fixedly connected to the other end of the protective cover.

[0026] The spring is fixedly connected to the outer cylinder via a connecting bracket 11 .

[0027] The sliding of the protective cover is achieved by a spring and a tractor. When the traction force of the tractor is greater than the elastic force, the protective cover slides toward the tractor, otherwise it slides toward the tractor and away from the tractor, and finally stops at a balanced position.

[0028] like Figure 2 As shown, the protective cover is provided with a through hole 14, and the through hole and the window form a detection channel; when the tractor pulls the protective cover and makes the through hole coincide with the window, the detection channel is opened; when the through hole and the window do not coincide, the detection channel is closed.

[0029] The fan is located outside the infrared temperature measuring sensor, so that the infrared temperature measuring sensor is in the wind path of the fan.

[0030] There are two positional relationships between the infrared temperature sensor and the fan. One is that the infrared temperature sensor is close to the outside and the fan is close to the inside. Although this method can also dispel water vapor, the infrared rays emitted during infrared temperature measurement may be blocked by the fan blades, resulting in inaccurate temperature measurement. This embodiment adopts another method, that is, the infrared temperature sensor is close to the inside and the fan is close to the outside. The temperature measuring probe of the infrared temperature sensor is small and will not affect the wind path. Accurate temperature measurement can be achieved with the help of the wind path. At this time, the outside and inside are relative to the inner cylinder, the one close to the inner cylinder is "inside", and the one far away from the inner cylinder is "outside".

[0031] like Figure 1 As shown, the washing machine also includes a drying system 40 for heating the cold air between the outer drum and the inner drum, and a door seal 50 for introducing the hot air output by the drying system into the inner drum. Ventilation holes are opened on the wall of the inner drum.

[0032] The drying system comprises a drying tunnel, a drying heating pipe arranged in the drying tunnel and a drying tunnel fan.

[0033] The inner drum of the drum washing machine is arranged in the outer drum, and the inner drum is provided with many ventilation holes; when the drying program is running, the drying system starts to work, and the drying duct fan introduces the heat generated by the drying heating tube into the door seal, and the hot air enters the inner drum through the door seal, and the cold air in the inner drum enters the outer drum under the push of the hot air, and negative pressure appears in the dehumidification duct, and the cold air entering the outer drum enters the dehumidification duct, and then is heated and circulated by the drying system.

[0034] When the drying program starts, the drying heating tube in the drying tunnel and the drying tunnel fan inside it start running, blowing hot air into the inner tube through the door seal and the outer tube. At the same time, the detection channel opens, and the infrared temperature detection device starts to detect the surface temperature of the inner tube and feeds it back to the computer board.

[0035] When the detection temperature T n Equal to the maximum drying temperature T H When the drying and heating tube in the drying tunnel stops working, the drying tunnel fan and infrared temperature detection device continue to work, and the drying tunnel blows cold air into the inner tube.

[0036] When the detection temperature T n Equal to the low temperature T set for drying L When the drying process ends, the drying tunnel stops working, the infrared temperature detection device stops working, the tractor stops working, and the detection channel is closed.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An infrared temperature detection device for a washing machine, characterized in that: The washing machine comprises an inner drum (30) and an outer drum (20) with a window; the detection device comprises an infrared temperature sensor and a fan (15) fixedly connected to the outer wall of the outer drum, and a protective cover (12) slidably connected to the outer drum and used to close the window; when the protective cover does not close the window, the infrared temperature sensor and the fan are directed toward the inner drum through the window; It comprises a slide rail fixed on the outer cylinder, a spring (16) one end of which is fixedly connected to the outer cylinder, and a tractor (13); the protective cover is arranged in the slide rail, the other end of the spring is fixedly connected to one end of the protective cover, and the tractor is fixedly connected to the other end of the protective cover; The fan is located outside the infrared temperature measuring sensor, so that the infrared temperature measuring sensor is in the wind path of the fan.

2. The infrared temperature detection device for a washing machine according to claim 1, characterized in that: The protective cover is provided with a through hole (14), and the through hole and the window form a detection channel; when the tractor pulls the protective cover and makes the through hole overlap with the window, the detection channel is opened; when the through hole and the window do not overlap, the detection channel is closed.

3. The infrared temperature detection device for a washing machine according to claim 1, characterized in that: The washing machine also includes a drying system (40) for heating cold air between the outer drum and the inner drum, and a door seal (50) for introducing hot air output by the drying system into the inner drum, and a vent hole is provided on the wall of the inner drum.

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