Anti-surge refrigerator

Abstract

According to the anti-surge refrigerator, the electric heating tubes are vertically arranged on the four sides of the evaporator coil in pairs, meanwhile, the electric heating tubes are arranged outside the evaporator coil, and the positive electrode and the negative electrode of the refrigerator are connected with the electric heating tubes and the protection devices connected to the two ends of the electric heating tubes in parallel through the wires respectively. According to the refrigerator, heat can be provided in a staggered mode from different directions through the electric heating pipes, the heat dissipation area is increased, frost formation is reduced, meanwhile, high surge voltage connected into the refrigerator can be released through the pressure difference formed between the first metal sheet and the second metal sheet and the pressure difference formed between the second metal sheet and the third metal sheet, and therefore the heat dissipation efficiency is improved. Therefore, the high surge voltage is prevented from exceeding the withstand voltage value of the electric heating tube, and spontaneous combustion caused by the damage of the high surge voltage to the electric heating tube is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrical equipment, concretely relates to a surge protection refrigerator. BACKGROUND

[0002] At present, the existing electric heating tube for defrosting of the refrigerator still has some deficiencies, such as the area of the electric heating tube during defrosting is relatively small, which slows down the defrosting speed of the refrigerator, increases the labor intensity of the operator during defrosting, and the existing electric heating tube for defrosting of the refrigerator has weak strength and oxidation resistance during heat conduction, which increases the damage probability of the electric heating tube during use and shortens the service life of the electric heating tube during use. Therefore, a new technical solution is needed to solve it.

[0003] For example, Chinese patent application No. 201821050954.3, published on January 25, 2019, discloses an electric heating tube for defrosting of a refrigerator, which structure includes a pipe body, the pipe body is provided with a heat resistance wire and a connecting plate, the heat resistance wire is fixedly connected inside the pipe body, the connecting plate is fixedly connected to the right end of the pipe body, the connecting plate is provided with a fixed head and a wire, the fixed head is fixedly connected to the middle of the right end of the connecting plate, the wire is fixedly connected inside the connecting plate, the right end of the fixed head is provided with a power cord, and the end of the power cord is provided with a plug.

[0004] The above document increases the area of the electric heating tube during defrosting to speed up the defrosting speed of the refrigerator. It only considers the defrosting area of the electric heating tube and does not consider the case of electric heating tube burnout during use of the electric heating tube in the refrigerator.

[0005] In order to realize the defrosting function, the existing technology refrigerator generally sets electric heating tubes on both sides of the evaporator inside the refrigerator. Since the electric heating tube is always in an energized state, and the electric heating tube is set near the evaporator, when an overcurrent or overvoltage protection device needs to be set, the electric heating tube is always connected with the local power grid. In some underdeveloped areas at present, there is no anti-surge voltage measure at the household end of the power grid, and the action end of the surge voltage is "fire line-ground line", which is equivalent to the surge voltage directly acting on the connection end of the electric heating tube. The surge voltage is very high and extremely easy to exceed the withstand voltage of the electric heating tube, damaging the electric heating tube. After being repeatedly impacted by high surge voltage, the electric heating tube appears high-temperature oxidation and ablation state. SUMMARY

[0006] The utility model aims at providing a surge protection refrigerator, which can avoid high surge voltage damage to the electric heating tube, thereby avoiding the self-ignition of the refrigerator, eliminating safety hazards, and having a simple structure.

[0007] In order to achieve the above object, the utility model provides a kind of anti-inrush surge refrigerator, including refrigerator cabinet, the inside of refrigerator cabinet is equipped with compression device, condensing device, pressure drop device, filter, evaporator coil pipe, energy accumulator and electric heating tube, the inboard of refrigerator cabinet is provided with evaporator coil pipe, electric heating tube is arranged at the four sides of evaporator coil pipe, the both ends of electric heating tube are connected with the positive pole and negative pole of refrigerator respectively by wire, the both ends of electric heating tube are connected with protection device in parallel, the protection device includes first metal sheet, second metal sheet and third metal sheet, first metal sheet, second metal sheet, third metal sheet are arranged in parallel on the same straight line, first metal sheet is connected with the positive pole of refrigerator by wire, second metal sheet is grounded, third metal sheet is connected with the negative pole of refrigerator by wire, second metal sheet is located between first metal sheet and third metal sheet, and first metal sheet, second metal sheet and third metal sheet are arranged at intervals, first metal sheet and second metal sheet and third metal sheet are pottingly arranged, and protection device is fixedly arranged on evaporator or refrigerator wall surface.

[0008] The above arrangement, in the normal working process of refrigerator, the compressed gas formed by compression device exchanges heat with the object placed in the inside of refrigerator cabinet after passing through condensing device, pressure drop device, filter and forming liquid refrigerant in evaporator coil pipe, due to temperature change caused by heat exchange, water molecules in air can form frost on evaporator coil pipe, and by arranging electric heating tube on the four sides of evaporator coil pipe, heat can be provided from different directions by electric heating tube, the heat dissipation area is increased, the formation of frost is reduced, and the normal work of refrigerator is ensured, so that electric heating tube is in a long-term power-on state, when high surge voltage is generated in local power grid and delivered to power grid user end, the electric heating tube will be damaged when exceeding the withstand voltage value of electric heating tube, by arranging protection device between the wire connected with electric heating tube and refrigerator, when high surge voltage is input into refrigerator, due to the grounding of second metal sheet, pressure difference is formed between first metal sheet and second metal sheet and between second metal sheet and third metal sheet, so that external high surge voltage is released through the pressure difference between first metal sheet and second metal sheet and the pressure difference between second metal sheet and third metal sheet, thereby avoiding high surge voltage exceeding the withstand voltage value of electric heating tube, so as to avoid high temperature oxidation and ablation of electric heating tube, so that the refrigerator can have better defrosting effect while preventing high surge voltage from damaging electric heating tube and causing fire, eliminating safety hazards, and the protection device is connected with live wire, ground wire and zero wire by three metal sheets respectively, and then sealed by potting, so that only three metal sheets arranged by potting need to be connected between electric heating tube, the structure is simple and reliable, and the protection device is fixed on the fixing frame of evaporator, so that it is close to electric heating tube and easy to install.

[0009] Further, the spacing between the first metal sheet and the second metal sheet ranges from 0.5 to 1 mm, the spacing between the second metal sheet and the third metal sheet ranges from 0.5 to 1 mm, and the thickness of the first metal sheet, the second metal sheet and the third metal sheet ranges from 0.5 to 1 mm.

[0010] The above arrangement ensures that the spacing between the three metal sheets is not large, which can ensure better pressure relief effect, and the thickness is not large, so as to ensure that the entire protection device is not too large, thereby facilitating placement.

[0011] Further, the gas outlet of the compression device is connected to one end of the condensing device, the other end of the condensing device is connected to one end of the pressure reducing device, the other end of the pressure reducing device is connected to one end of the filter, the other end of the filter is connected to one end of the evaporator coil, the other end of the evaporator coil is connected to the energy accumulator, and the other end of the energy accumulator is connected to the compression device.

[0012] The above arrangement facilitates circulation of the refrigerant between the compression device, the condensing device, the pressure reducing device, the filter, the evaporator coil and the energy accumulator to achieve refrigeration of the refrigerator body.

[0013] Further, the electric heating tube is provided with two or more than two, and adjacent electric heating tubes on four sides of the evaporator coil are vertically arranged.

[0014] The above arrangement facilitates staggered heat dissipation of the electric heating tube from different directions to reduce the formation of frost on the evaporator coil.

[0015] Further, the electric heating tube comprises a steel tube and a resistance wire, and a containing space is formed between the resistance wire and the inner wall of the steel tube. After the filler fills the containing space, the port of the steel tube is sealed with an insulating material.

[0016] The above arrangement facilitates fixation of the resistance wire in the steel tube and facilitates connection with the wire.

[0017] Further, the resistance wire forms an extension at the port of the steel tube and is connected to one end of a lead rod, the other end of the lead rod is connected to the wire, the steel tube is arranged as a U-shaped steel tube, and the wire comprises a first wire and a second wire, the first wire is connected to the positive electrode of the refrigerator, and the second wire is connected to the negative electrode of the refrigerator.

[0018] The above arrangement facilitates connection of the resistance wire with the wire through the lead rod.

[0019] Further, a sealing area one is formed on four sides of the end of the steel tube, the extension of the resistance wire, the lead rod and the end of the wire, and the sealing area one is sealed with an insulating material.

[0020] The above arrangement prevents leakage at the connection of the resistance wire, the lead rod and the wire from affecting the normal operation of the electric heating tube.

[0021] Further, the filler is set as solid granular magnesium oxide.

[0022] The above setting can have a lot of thermal conductivity while avoiding conduction, and further transmits the heat of the resistance wire to the steel pipe.

[0023] Further, a sealing area two is formed on four sides of the connection between the protection device and the wire, and the sealing area two is filled with insulating material.

[0024] The above setting avoids the contact between the protection device and the outside, can better connect with the wire, releases the surge high voltage formed between the wires, and thus prevents the damage of the electric heating pipe.

[0025] Further, fixed value resistors are further arranged in parallel at two ends of the protection device, the protection device and the fixed value resistors are connected in parallel, and one end of the protection device is connected with one end of a first pressure sensitive resistor and one end of a second pressure sensitive resistor.

[0026] The above setting can make the resistance value smaller after being connected in parallel by matching the resistors with appropriate resistance values at two ends of the protection device, so that a larger current can be drained when the current of the refrigerator suddenly increases, and thus the electric heating pipe is protected; and the pressure sensitive resistors are connected in series and in parallel, the pressure sensitive resistors with different resistance values are matched to divide the voltage, so that the voltage in the circuit will not exceed the withstand voltage of the electric heating pipe after the high surge voltage is input into the refrigerator and is divided by the pressure sensitive resistors, and thus the electric heating pipe is better protected. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a connection diagram of the electric heating pipe and the protection device in the utility model.

[0028] Figure 2 It is a sectional view of the electric heating pipe in the utility model.

[0029] Figure 3 It is a connection diagram of the refrigerator and the electric heating pipe in the utility model.

[0030] Figure 4 It is a mold diagram for filling of the protection device in the utility model.

[0031] Figure 5 It is a connection diagram of the electric heating pipe and the protection device in another embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail in combination with the drawings and the specific embodiment.

[0033] For example, Figures 1-5As shown, a surge-proof refrigerator includes a refrigerator body 001. Inside the refrigerator body 001 are a compression device a1, a condensing device a2, a pressure-reducing device a3, a filter a4, an evaporator coil a5, an accumulator a6, and an electric heating element a7. The outlet of the compression device a1 is connected to one end of the condensing device a2, the other end of the condensing device a2 is connected to one end of the pressure-reducing device a3, the other end of the pressure-reducing device a3 is connected to one end of the filter a4, the other end of the filter a4 is connected to one end of the evaporator coil a5, the other end of the evaporator coil a5 is connected to the accumulator a6, and the other end of the accumulator a6 is connected to the compression device a1.

[0034] like Figure 3 As shown, the evaporator coil a5 is located inside the refrigerator body 001. Two sets of heating elements a7 are provided. A storage space is provided at the rear of the refrigerator, and a refrigerator wall is provided in the storage space. One set of heating elements a7 is located at the bottom of the evaporator coil a5, and the other set of heating elements a7 is located on the refrigerator wall. Adjacent heating elements a7 on the four sides of the evaporator coil a5 are arranged perpendicularly in pairs. The heating elements a7 are fixed to the evaporator coil a5 by a fixing bracket (not shown in the figure). The protective device corresponding to the heating element a7 located at the bottom of the evaporator coil a5 is fixed to the fixing bracket by insulating glue. The protective device corresponding to the heating element a7 located on the refrigerator wall is fixed to the refrigerator wall by insulating glue. This allows the heat emitted by the heating elements a7 to be dissipated to the evaporator coil a5 from different directions, which reduces the formation of frost on the evaporator coil a5 and also facilitates the fixing of the protective device. In this embodiment, the compression device is a compressor, the condensation device is a condenser tube, and the pressure drop device is a spiral copper tube, all of which are existing technologies and will not be described in detail here.

[0035] like Figure 1As shown, the two ends of the electric heating tube a7 are connected with the positive and negative poles of the external lead wires of the refrigerator through lead wires, respectively, the lead wires include a first lead wire 11 and a second lead wire 12, the two ends of the electric heating tube are connected with the first lead wire 11 and the second lead wire 12, respectively, a protection device is connected between the first lead wire 11 and the second lead wire 12, the protection device includes a first metal sheet 01, a second metal sheet 02 and a third metal sheet 03, the first metal sheet 01, the second metal sheet 02 and the third metal sheet 03 are arranged in parallel on the same straight line, the first metal sheet 01 is connected with the positive pole of the refrigerator through the first lead wire 11, the second metal sheet 02 is grounded, the third metal sheet 03 is connected with the negative pole of the refrigerator through the second lead wire 12, the spacing between the metal sheets is 0.5-1mm, and the thickness of the metal sheets is 0.5-1mm, in this embodiment, the spacing between the first metal sheet 01 and the second metal sheet 02 is 0.7mm, the spacing between the second metal sheet 02 and the third metal sheet 03 is 0.7mm, the thickness of the first metal sheet 01, the second metal sheet 02 and the third metal sheet 03 is 0.8mm, the length of the first metal sheet 01, the second metal sheet 02 and the third metal sheet 03 is 20mm, and the width of the first metal sheet 01, the second metal sheet 02 and the third metal sheet 03 is 10mm.

[0036] Because the electric heating tube is in a long-term power-on state, when strong thunderstorm weather occurs, the local power grid will generate high surge voltage to the power grid user end, which will damage the electric heating tube when exceeding the withstand voltage value of the electric heating tube. By arranging the protection device between the lead wires connected with the refrigerator, when high surge voltage is input into the refrigerator, the second metal sheet 02 is grounded, so that a pressure difference is formed between the first metal sheet 01 and the second metal sheet 02 and between the second metal sheet 02 and the third metal sheet 03, which can release the external high surge voltage through the pressure difference between the first metal sheet 01 and the second metal sheet 02 and the pressure difference between the second metal sheet 02 and the third metal sheet 03, thereby avoiding the high surge voltage exceeding the withstand voltage value of the electric heating tube, avoiding high-temperature oxidation and ablation of the electric heating tube, and avoiding the refrigerator 01 from catching fire, thereby eliminating the safety hazard.

[0037] As Figure 1As shown, the heating element also includes a steel pipe 1, a resistance wire 2, and a lead rod. The resistance wire 2 is disposed inside the hollow steel pipe 1, and a receiving space 4 is formed between the resistance wire 2 and the inner wall of the steel pipe 1. The receiving space 4 is filled with an insulating and thermally conductive filler (not shown in the figure). The filler is solid granular magnesium oxide. The two ends of the steel pipe 1 are provided with ports. After the filling filler fills the receiving space 4, it can avoid electrical conduction while having a lot of thermal conductivity, so that the heat generated by the resistance wire 2 after being energized can be transferred to the steel pipe 1. The ports are potted with insulating material to fix the resistance wire 2 inside the steel pipe 1, thereby facilitating connection with the wire. The two ends of the resistance wire 2 extend to the port of the steel pipe 1 to form extensions 5. The resistance wire 2 is connected to the wire through a lead rod. In this embodiment, the number of lead rods is set to two. One end of the extension 5 of the resistance wire 2 is connected to one end of a lead rod 21, and the other end of the lead rod 21 is connected to one end of the first wire 11. The other end of the first wire 11 is connected to the live wire (not shown in the figure). The other end of the extension 5 of the resistance wire 2 is connected to one end of another lead rod 22, and the other end of the other lead rod 22 is connected to one end of the second wire 12. The other end of the second wire 12 is connected to the neutral wire (not shown in the figure). After the resistance wire 2 is connected to the wire through the lead rod, a sealing area 31 is formed on the four sides of the end of the steel pipe 1, the extension 5 of the resistance wire 2, the lead rod, and the end of the wire. The sealing area 31 is potted with insulating material to prevent leakage at the connection of the resistance wire 1, the lead rod, and the wire, which would affect the normal operation of the heating element.

[0038] like Figure 1 As shown, a sealing area 32 is formed on all four sides of the protection device and its connection with the wire. Within the sealing area 32, the first metal sheet 01, the second metal sheet 02, and the third metal sheet 03 are first arranged parallel to each other on a predetermined straight line, with a spacing of 0.7mm between the metal sheets. The spacing between the metal sheets should not be too large or too small to prevent a voltage difference from forming between the metal sheets when a high surge voltage is applied to the positive and negative terminals of the refrigerator. Then, liquid insulating material is poured and encapsulated from all four sides within the sealing area 32. After the insulating material solidifies, the protection device can be connected between the first wire 11 and the second wire 12. This prevents the protection device from contacting the outside environment, allows for better connection with the wires, and releases the high voltage formed between the wires, thereby preventing the surge from damaging the entire heating element. In this embodiment, the insulating material is resin, such as... Figure 4As shown, during the potting process, resin is first poured into the recessed cavity on the lower mold b1, making the surface of the resin flush with the upper end face b11 of the lower mold b1. Then, three metal plates connected to external wires are set at intervals. The lower mold b1 has through holes corresponding to the external wires on the three metal plates (not shown in the figure). Then, the upper mold b2 is closed, and resin is poured in through the opening b3 on the upper mold b2 until the resin fills the entire cavity of the upper mold b2. After the resin dries, the upper and lower molds are demolded, thus realizing the protective device after potting. The protective device formed by potting is connected to the heating element and the ground wire respectively through the external wires. It can be set near the device for fixing the heating element and can be fixed by adhesive.

[0039] In one embodiment, such as Figure 5 As shown, a fixed resistor a1 is connected in parallel across the two ends of the protection device. By matching resistors with appropriate resistance values ​​across the two ends of the protection device, the resistance value after parallel connection can be smaller, thereby diverting a larger current when the refrigerator current suddenly increases, thus protecting the heating element. After the protection device is connected in parallel with the fixed resistor a1, it is connected to one end of varistor a11 and one end of varistor a22 respectively. The other end of varistor a11 is connected in series with varistor a33, which is grounded. The other end of varistor a22 is connected to the second wire 12, which is connected to the negative terminal of the refrigerator.

[0040] In another embodiment, two or more varistors a33 connected in series with varistor a11 can be set according to the high surge voltage input in the circuit. In this way, by connecting varistors in series and parallel, voltage can be divided by matching varistors with different resistance values. After the high surge voltage is input to the refrigerator, the voltage in the circuit will not exceed the withstand voltage of the heating element after the voltage is divided by the varistors, thereby better protecting the heating element.

[0041] The working principle of this utility model is as follows: Two heating elements are vertically arranged on each side of the evaporator coil, and another heating element is installed outside the evaporator coil. The positive and negative terminals of the refrigerator are connected to the heating elements and a protection device connected in parallel at both ends of the heating elements via wires. During normal operation, the heating elements provide heat from different directions in an alternating manner, increasing the heat dissipation area and reducing frost formation. Simultaneously, the high surge voltage applied to the refrigerator is released through the voltage difference between the first metal plate 01 and the second metal plate 02, and the voltage difference between the second metal plate 02 and the third metal plate 03. This prevents the high surge voltage from exceeding the withstand voltage of the heating elements, thus preventing damage and spontaneous combustion.

Claims

1. A surge protection refrigerator comprising a refrigerator cabinet, inside which are provided a compression device, a condensing device, a pressure drop device, a filter, an evaporator coil, an accumulator and an electric heating tube, characterized in that: The evaporator coil is arranged on the inner side of the refrigerator body, the electric heating tube is arranged on the four sides of the evaporator coil and the outside, the two ends of the electric heating tube are connected with the positive and negative poles of the refrigerator through wires respectively, the two ends of the electric heating tube are connected with the protection device in parallel, the protection device comprises a first metal sheet, a second metal sheet and a third metal sheet, the first metal sheet, the second metal sheet and the third metal sheet are arranged in parallel on the same straight line, the first metal sheet is connected with the positive pole of the refrigerator through a wire, the second metal sheet is grounded, the third metal sheet is connected with the negative pole of the refrigerator through a wire, the second metal sheet is located between the first metal sheet and the third metal sheet, and the first metal sheet, the second metal sheet and the third metal sheet are arranged at intervals, the first metal sheet and the second metal sheet and the third metal sheet are arranged in a pouring manner, and the protection device is fixedly arranged on the evaporator or the wall surface of the refrigerator.

2. The surge protected refrigerator of claim 1, wherein: The distance between the first metal sheet and the second metal sheet is 0.5-1mm, the distance between the second metal sheet and the third metal sheet is 0.5-1mm, and the thickness of the first metal sheet, the second metal sheet and the third metal sheet is 0.5-1mm.

3. The surge protection refrigerator according to claim 1, wherein: The outlet of the compression device is connected with one end of the condensing device, the other end of the condensing device is connected with one end of the pressure drop device, the other end of the pressure drop device is connected with one end of the filter, the other end of the filter is connected with one end of the evaporator coil, the other end of the evaporator coil is connected with the energy accumulator, and the other end of the energy accumulator is connected with the compression device.

4. The surge protected refrigerator of claim 1, wherein: The electric heating tube is provided with two or more than two, and the adjacent electric heating tubes arranged on the four sides of the evaporator coil are arranged vertically.

5. The surge protected refrigerator of claim 1, wherein: The electric heating tube comprises a steel tube and a resistance wire, and a containing space is formed between the resistance wire and the inner wall of the steel tube, and after the filler fills the containing space, the port of the steel tube is treated by pouring sealing with insulating material.

6. The surge protected refrigerator of claim 5, wherein: The resistance wire forms an extension at the port of the steel tube and is connected with one end of the lead rod, the other end of the lead rod is connected with the wire, the steel tube is arranged in a U-shaped steel tube, the wire comprises a first wire and a second wire, the first wire is connected with the positive pole of the refrigerator, and the second wire is connected with the negative pole of the refrigerator.

7. The surge protected refrigerator of claim 1, wherein: Sealing area one is formed on the four sides of the end of the steel tube, the extension of the resistance wire, the lead rod and the end of the wire, and the sealing area one is treated by pouring sealing with insulating material.

8. The surge protected refrigerator of claim 5, wherein: The filler is arranged in the form of solid particles of magnesium oxide.

9. The surge protected refrigerator of claim 1, wherein: Sealing area two is formed on the four sides of the connection between the protection device and the wire, and the sealing area two is treated by pouring sealing with insulating material.

10. The surge protected refrigerator of claim 1, wherein: A fixed resistance is also connected in parallel with the two ends of the protection device, and after the protection device and the fixed resistance are connected in parallel, one end of the first pressure sensitive resistor and one end of the second pressure sensitive resistor are connected, the other end of the first pressure sensitive resistor is connected with the third pressure sensitive resistor in series, the third pressure sensitive resistor is grounded, and the other end of the second pressure sensitive resistor is connected with the second wire.

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