An air conditioning system and its heating device

Abstract

The present invention provides an air conditioning system and a heating device thereof. The heating device includes: an electric heater, with a first pipe and a second pipe respectively connected to both ends thereof, wherein the first pipe is used to connect the outlet of a blower, and the second pipe is used to connect an air conditioner; a first valve and a second valve, which are respectively arranged on the first pipe and the second pipe and are used to close when the electric heater stops working to seal the electric heater; an inflation pipe, with one end connected to the electric heater and the other end used to connect an inflation device, and a third valve is arranged thereon. The third valve is used to control the inflation device to inflate the electric heater so that the air pressure inside the electric heater is greater than the external air pressure. The technical solution provided by the present invention can prevent external humid air from entering and infiltrating into the interior of the electric heater, can reduce the contact between the electric heating elements inside the electric heater and the humid air, and can solve the problem that the service life of the electric heating elements becomes shorter due to moisture absorption.

Description

Technical Field

[0001] The present invention relates to the technical field of heating devices for air conditioning systems, and particularly to an air conditioning system and its heating device. Background Art

[0002] An air conditioner is a commonly used indoor temperature adjustment device, and its structure includes an outdoor heat exchanger, an indoor heat exchanger, an indoor fan, an outdoor fan, and a compressor. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are connected into a temperature control pipeline loop through a four-way connection valve. When performing heating treatment on the indoor environment, the compressor compresses the refrigerant into a high-temperature and high-pressure gas, and then liquefies the high-temperature and high-pressure refrigerant gas through the indoor heat exchanger into a low-temperature and high-pressure liquid. At this time, the refrigerant releases a large amount of heat, causing the temperature of the air around the indoor heat exchanger to rise. Then, under the action of the indoor fan, the hot air is blown into the room, raising the indoor temperature. After the refrigerant releases heat at the indoor heat exchanger, it flows to the outdoor heat exchanger under the action of the compressor, and exchanges heat with the outdoor air at the outdoor heat exchanger for the next cycle. The outdoor fan can accelerate the air flow speed at the outdoor heat exchanger to improve the heat exchange efficiency between the refrigerant and the outdoor air.

[0003] When the refrigerant exchanges heat with the outdoor air at the outdoor heat exchanger, if the temperature of the outdoor air is relatively low, the refrigerant cannot absorb the heat of the outdoor air at the outdoor exchanger. Even when the temperature of the outdoor air is lower than the freezing point of the refrigerant water, the refrigerant will condense at the outdoor heat exchanger, causing the outdoor heat exchanger to burst. To solve this problem, an electric heater can be provided between the outdoor fan and the outdoor heat exchanger. The electric heater can preheat the air sent to the outdoor heat exchanger to prevent the refrigerant from condensing and causing the bursting of the outdoor heat exchanger.

[0004] Although the setting of the electric heater can preheat the air sent to the outdoor heat exchanger, when the air conditioner is in a humid environment, such as when used on a ship, the electric heater is in long-term contact with humid air, which will cause the electric heating element inside the electric heater to be affected by moisture and the insulation resistance to decrease, affecting the service life of the electric heater. Summary of the Invention

[0005] The purpose of the present invention is to provide an air conditioning system and its heating device to at least solve the problem that the service life of the electric heater is affected in a humid environment.

[0006] To at least solve the above technical problems, the present invention provides the following technical solutions:

[0007] A heating device for an air conditioning system, comprising:

[0008] An electric heater, with a first pipe and a second pipe connected to its two ends respectively, where the first pipe is used to connect the outlet of a fan, and the second pipe is used to connect an air conditioner;

[0009] A first valve and a second valve, which are respectively arranged on the first pipe and the second pipe, and are used to close when the electric heater stops working to seal the electric heater;

[0010] An inflation pipe, one end of which is connected to the electric heater, the other end is used to connect an inflation device, and is provided with a third valve, and the third valve is used to control the inflation device to inflate the electric heater, so that the air pressure inside the electric heater is greater than the external air pressure.

[0011] According to an embodiment of the present invention, it further includes a controller, the controller is connected to the third valve and is connected with a pressure sensor;

[0012] The pressure sensor is arranged inside the inflation pipe and is used to detect the air pressure inside the inflation pipe;

[0013] The controller is used to control the third valve according to the air pressure inside the inflation pipe.

[0014] According to an embodiment of the present invention, a filter is further arranged on the inflation pipe and is used to filter the gas filled into the electric heater.

[0015] According to an embodiment of the present invention, a pressure reducing valve is further arranged on the inflation pipe and is used to reduce the pressure of the gas filled into the electric heater.

[0016] According to an embodiment of the present invention, the first valve and / or the second valve is a pressure valve, and is used to discharge the air in the electric heater when inflating the electric heater.

[0017] According to an embodiment of the present invention, the electric heater is further connected with an air extraction pump, and the air extraction pump is used to extract the air in the electric heater to reduce the air pressure inside the electric heater;

[0018] The third valve is a pressure valve and is used to open to inflate the electric heater when the air pressure inside the electric heater is less than the external air pressure.

[0019] According to an embodiment of the present invention, the electric heater is further connected with an exhaust pipe, and a pressure valve is arranged on the exhaust pipe, and the pressure valve is used to discharge the air in the electric heater when the inflation device inflates the electric heater.

[0020] According to an embodiment of the present invention, the electric heater is further connected to an exhaust duct, and an air extraction pump is provided on the exhaust duct. The third valve is a pressure valve. The air extraction pump is used to extract the air in the electric heater, and the third valve is used to open when the air pressure inside the electric heater is less than the air pressure outside.

[0021] According to an embodiment of the present invention, a heating tape is provided outside the electric heater to heat the electric heater to prevent condensation on the electric heater.

[0022] An air-conditioning system includes a blower, an air conditioner, and a heating device as described in any one of the above embodiments. One end of the heater in the heating device is connected to the outlet of the blower through a first duct, and the other end is connected to the air conditioner through a second duct.

[0023] In the technical solution provided by the present invention, the electric heater is connected to an inflation duct, with a first duct and a second duct provided at both ends respectively, and a first valve is provided on the first duct, and a second valve is provided on the second duct. When the electric heater stops working, the first valve and the second valve can be closed to seal the electric heater and prevent external moist air from entering the interior of the electric heater; and the inflation duct can inflate the electric heater to make the air pressure inside the electric heater greater than the air pressure outside, that is, to keep the electric heater in a slightly positive pressure state and prevent external moist air from penetrating into the interior of the electric heater through the housing. Since the technical solution of the present invention can prevent external moist air from entering and penetrating into the interior of the electric heater, the contact between the electric heating element inside the electric heater and the moist air can be reduced, and the problem of shortened service life of the electric heating element caused by moisture can be solved.

[0024] Those skilled in the art will understand the above and other objects, advantages and features of the present invention more clearly according to the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary and non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a heating device of an air-conditioning system according to an embodiment of the present invention;

[0027] Figure 2 is a structural diagram of a heating device provided with a filter according to an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a heating device provided with a pressure reducing valve according to an embodiment of the present invention;

[0029] Figure 4 is a schematic structural view of a heating device provided with a first air extraction pump according to an embodiment of the present invention;

[0030] Figure 5 is a schematic structural view of a heating device provided with a first exhaust duct according to an embodiment of the present invention;

[0031] Figure 6 is a schematic structural view of a heating device provided with a second exhaust duct according to an embodiment of the present invention;

[0032] Figure 7 is a schematic structural view of a heating device provided with a heating tape according to an embodiment of the present invention. Detailed implementation manners

[0033] In the description of this embodiment, the descriptions with reference to terms such as "an embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] Figure 1 Shown is a schematic structural view of a heating device of an air conditioning system. The heating device includes an electric heater 1 and an inflation duct 13. One end of the inlet of the electric heater 1 is connected to one end of a first duct 11, and the outlet is connected to one end of a second duct 12. The other end of the first duct 11 is connected to the outlet of an outdoor fan, and a first valve 21 is provided on the first duct 11; the other end of the second duct 12 is provided at an outdoor heat exchanger, and a second valve 22 is provided on the second duct 12. In this embodiment, both the first valve 21 and the second valve 22 can adopt electric airtight valves. One end of the above inflation duct 13 is connected to the electric heater 1. This connection can be that the inflation duct 13 is directly communicated with the inside of the electric heater 1, or the inflation duct 13 is connected to the first duct 11 or the second duct 12, so as to be indirectly communicated with the inside of the electric heater 1; the other end of the inflation duct 13 is used to connect to an inflation device. The inflation device can adopt an inflation device for instrument air, and a third valve 23 is provided on the inflation duct 13. The third valve 23 can adopt an electric ball valve. When the third valve 23 is opened, the inflation device is communicated with the inside of the electric heater 1, and air can be inflated into the inside of the electric heater 1.

[0035] The heating device of the air conditioning system provided by this application can reduce the humidity and dust amount inside the electric heater 1, reduce the contact between the electric heating element inside the electric heater 1 and the wet air to prevent the electric heating element from getting damp, thereby solving the problem that the service life of the electric heater 1 is shortened due to the dampness of the electric heating element. The working principle of the moisture-proof of the heating device is described below:

[0036] When the air conditioner is in the working state, open the first valve 21 and the second valve 22, and turn on the outdoor fan to accelerate the air flow speed on the surface of the outdoor heat exchanger and improve the heat exchange efficiency of the outdoor heat exchanger; if the outdoor temperature is lower than the set temperature value, turn on the electric heater 1. After the electric heater 1 is turned on, it can heat the air blowing towards the electric heater 1 to prevent the problem that the temperature of the outdoor heat exchanger is too low and the refrigerant condenses;

[0037] When the air conditioner stops working, the first valve 21 and the second valve 22 can be closed to seal the electric heater 1, preventing the wet air from entering the electric heater 1 from the fan outlet 21 or from the air conditioner 22, and reducing the contact between the electric heating element of the electric heater 1 and the wet air; then open the third valve 23 to connect the inflating device with the electric heater 1, and make the inflating device fill the electric heater 1 with gas to increase the air pressure inside the electric heater 1 until the air pressure inside the electric heater 1 is greater than the external air pressure, making the inside of the electric heater 1 in a slightly positive pressure state, reducing the infiltration of external wet air and dust into the electric heater 1, so as to achieve the purpose of moisture-proof and dust-proof of the electric heater 1.

[0038] In summary, due to the technical solution provided by this application, not only the electric heater 1 is sealed by the first valve 21 and the second valve 22 when the air conditioner stops working to prevent external wet air and dust from entering the inside of the electric heater 1, but also gas is filled into the electric heater 1 through the inflating pipeline 13 to make the air pressure inside the electric heater 1 greater than the external air pressure, preventing external wet air and dust from infiltrating into the electric heater 1. Therefore, it can reduce the humidity and dust amount inside the electric heater 1, prevent the internal electric heating element from getting damp due to excessive humidity of the air inside the electric heater 1, and increase the service life of the electric heater 1.

[0039] In an embodiment, the heating device of the air conditioning system of this application further includes a pressure detection device. This pressure detection device can be installed on the inner wall of the electric heater 1 or on the inner wall of the inflating pipeline 13, and is used to detect the air pressure inside the electric heater 1. The opening and closing of the above-mentioned third valve 23 are controlled according to the air pressure inside the electric heater 1.

[0040] In this embodiment, the third valve 23 can be controlled manually or by a logic control device such as a single-chip microcomputer or a PLC. When the third valve 23 is manually controlled, the staff can obtain the air pressure inside the electric heater 1 through the pressure sensor. If the air pressure is not greater than the set air pressure value, the third valve 23 is controlled to open, so that the inflation device inflates the inside of the electric heater 1. And when the air pressure inside the electric heater 1 is greater than the set air pressure value, the third valve 23 is controlled to close.

[0041] When the third valve 23 is controlled by the controller, the signal output terminal of the voltage sensor can be connected to the controller, and an electrical connection between the controller and the third valve 23 is established. When the controller detects through the pressure sensor that the air pressure inside the electric heater 1 is not greater than the set air pressure value, the third valve 23 is controlled to open, so that the inflation device fills the inside of the electric heater 1 with air to increase the air pressure inside the electric heater 1; when the controller detects through the pressure sensor 30 that the air pressure inside the electric heater 1 is greater than the set air pressure value, the third valve 23 is controlled to close so that the inflation device stops filling the inside of the electric heater 1 with air.

[0042] In this embodiment, the standard atmospheric pressure can be used as the air pressure outside the electric heater 1. In order to ensure that the air pressure inside the electric heater 1 is always greater than the external air pressure, the above set voltage value is an air pressure value greater than the standard atmospheric pressure. For example, the set air pressure value can be set to 3 kPa, that is, the air pressure inside the electric heater 1 is stabilized at 3 kPa.

[0043] Through the setting method of this embodiment, the air pressure inside the electric heater 1 can be maintained in a state greater than the external air pressure, preventing the internal air pressure of the electric heater 1 from decreasing due to the leakage of internal gas to the outside, and improving the reliability of dust prevention and moisture protection of the electric heater 1.

[0044] In one embodiment, as Figure 2 shown, a filter 31 is further provided on the inflation pipeline 13 for filtering the gas filled into the inside of the electric heater 1. For example, a desiccant can be placed in the filter 31. When the inflation device fills the electric heater 1 with gas, the gas passes through the filter 31, and the filter 31 can absorb the moisture in the gas to improve the dryness of the gas, thereby further reducing the humidity of the gas inside the electric heater 1 and improving the reliability of moisture protection of the electric heater 1. In other embodiments, a dust-proof filter screen can be provided in the filter 34 to filter out the dust in the gas and improve the reliability of dust prevention of the electric heater 1.

[0045] In one embodiment, as Figure 3As shown, a pressure reducing valve 32 is also provided on the inflatable pipe 13 for reducing the pressure of the gas filled into the electric heater 1. Since the pressure of the gas output by the inflating device may be relatively large, if it exceeds the pressure bearing capacity of the electric heater 1, the electric heater 1 may be damaged when inflating the electric heater 1. In this embodiment, the pressure reducing valve 32 is provided on the inflatable pipe 13, which can reduce the pressure of the gas entering the electric heater 1 and avoid damaging the electric heater 1 during inflation, thereby improving the safety of the electric heater 1.

[0046] In one embodiment, one or all of the above-mentioned first valve 21 and second valve 22 are pressure valves, and the pressure valve opens when the difference between the air pressure inside the electric heater 1 and the external air pressure is greater than a set difference. In this embodiment, the set difference can be set according to requirements to make the air pressure inside the electric heater 1 greater than the external air pressure, and the first valve 21 and / or second valve 22 can be selected according to the set difference, so that the pressure difference on both sides of the first valve 21 and / or second valve 22 opens when it is greater than the set difference and closes when it is less than the set difference.

[0047] In this embodiment, the first valve 21 and / or the second valve 22 are set as pressure valves. When the first valve 21 and the second valve 22 are closed, the third valve 23 is opened, and the inflating device inflates the inside of the electric heater 1 to increase the air pressure inside the electric heater 1; when the difference between the air pressure inside the electric heater 1 and the external air pressure is greater than the set difference, the first valve 21 and / or the second valve 22 are opened to discharge the original air in the electric heater 1, thereby improving the dryness and cleanliness of the air inside the electric heater 1 and ensuring the reliability of dust prevention and moisture prevention of the electric heater 1.

[0048] In one embodiment, as Figure 4 shown, the above-mentioned electric heater 1 is connected with a first air extraction pump 33, and the above-mentioned third valve 23 is a pressure valve; the first air extraction pump 33 is used to extract the air in the electric heater 1 after the first valve 21 and the second valve 22 seal the electric heater 1; the third valve 23 is used to open when the air pressure inside the electric heater 1 is less than the external air pressure, so that the inflating device inflates the inside of the electric heater 1.

[0049] In the setting mode of this embodiment, after the air conditioner stops working and the first valve 21 and the second valve 22 are closed, the first air extraction pump 33 can be controlled to start. After the first air extraction pump 33 starts, the original air in the electric heater 1 can be extracted; when the first air extraction pump 33 extracts the original air in the electric heater 1, the air pressure inside the electric heater 1 drops to open the third valve 23, and the inflation device inflates the inside of the electric heater 1 to increase the air pressure inside the electric heater 1. Since the setting mode of this embodiment can discharge the air inside the electric heater 1 when inflating the electric heater 1, the dryness and cleanliness of the air inside the electric heater 1 can be improved, and the reliability of dust prevention and moisture protection of the electric heater 1 can be ensured.

[0050] In one embodiment, as Figure 5 shown, the electric heater 1 is further connected with a first exhaust pipe 14, and a pressure valve 24 is arranged on the exhaust pipe 14. The pressure valve 24 is used to discharge the air in the electric heater 1 when the inflation device inflates the electric heater 1. In the setting mode of this embodiment, after the air conditioner stops working and the first valve 21 and the second valve 22 are closed, the third valve 23 is opened. After the third valve 23 is opened, the inflation device fills the electric heater 1 with gas to increase the air pressure inside the electric heater 1; when the difference between the air pressure inside the electric heater 1 and the external air pressure reaches the opening threshold of the pressure valve 24, the pressure valve 24 is opened to discharge the original air inside the electric heater 1. Since the setting mode of this embodiment can discharge the air inside the electric heater 1 when inflating the electric heater 1, the dryness and cleanliness of the air inside the electric heater 1 can be improved, and the reliability of dust prevention and moisture protection of the electric heater 1 can be ensured.

[0051] In one embodiment, as Figure 6 shown, the electric heater 1 is further connected with a second exhaust pipe 15, and a second air extraction pump 25 is arranged on the second exhaust pipe 15. The third valve 23 is a pressure valve, wherein the second air extraction pump 15 is used to extract the air in the electric heater 1, and the third valve 23 is used to open when the air pressure inside the electric heater 1 is less than the external air pressure, so that the inflation device inflates the inside of the electric heater 1.

[0052] In the setting mode of this embodiment, when the air conditioner 22 stops working and the first valve 21 and the second valve 22 are closed, the second air extraction pump 25 can be opened to extract the original air in the electric heater 1; when the air extraction pump 14 extracts the original air in the electric heater 1, the air pressure inside the electric heater 1 drops, the third valve 23 is opened, and the inflation device inflates the inside of the electric heater 1 to increase the air pressure inside the electric heater 1. Since the setting mode of this embodiment can discharge the air inside the electric heater 1 when inflating the electric heater 1, the dryness and cleanliness of the air inside the electric heater 1 can be improved, and the reliability of dust prevention and moisture protection of the electric heater 1 can be ensured.

[0053] In one embodiment, a heating belt is provided outside the electric heater 1 to heat the electric heater 1 to prevent condensation from occurring on the heater. Figure 7 Taking the structure shown as an example, the heating belt includes a first heating belt 41 and a second heating belt 42. The first heating belt 41 and the second heating belt 42 are clamped on the shell of the electric heater 1. When the ambient temperature is low, for example, below 20°C, the first heating belt 41 and the second heating belt 42 can be controlled to work to heat the electric heater 1 so that the temperature inside the electric heater 1 is always higher than the ambient temperature. For example, the temperature inside the electric heater 1 can be always 5°C higher than the ambient temperature.

[0054] The arrangement of this embodiment uses a heating belt to heat the electric heater 1 to increase the temperature of the electric heater 1. On the one hand, it can prevent water vapor in the external air from condensing on the shell of the electric heater 1. On the other hand, it can prevent the low temperature of the electric heater 1 from causing condensation inside the electric heater 1, thereby further improving the moisture-proof reliability of the electric heater 1.

[0055] In one embodiment, the present invention also provides an air-conditioning system, which includes an outdoor fan, an outdoor heat exchanger and a heating device. The heating device is the same as the heating device in the above-mentioned embodiments. Since the heating device has been introduced in detail in the above-mentioned embodiments, in order to avoid repetition, no multiple descriptions are given in this embodiment.

[0056] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A heating device for an air conditioning system, characterized in that, Comprising: An electric heater, with a first pipe and a second pipe connected to its two ends respectively, wherein the first pipe is used to connect the outlet of a fan, and the second pipe is used to connect an air conditioner; A first valve and a second valve, which are respectively arranged on the first pipe and the second pipe, and are used to close when the electric heater stops working to seal the electric heater; An inflation pipe, one end of which is connected to the electric heater, the other end of which is used to connect an inflation device, and is provided with a third valve, and the third valve is used to control the inflation device to inflate the electric heater, so that the air pressure inside the electric heater is greater than the external air pressure.

2. The heating device of the air conditioning system according to claim 1, characterized in that, It further comprises a pressure sensor, and the pressure sensor is used to detect the air pressure inside the electric heater, and the third valve opens and closes according to the air pressure inside the electric heater.

3. The heating device of the air conditioning system according to claim 1 or 2, characterized in that, A filter is further arranged on the inflation pipe, and is used to filter the gas filled into the electric heater.

4. The heating device of the air conditioning system according to claim 1, characterized in that, A pressure reducing valve is further arranged on the inflation pipe, and is used to reduce the pressure of the gas filled into the electric heater.

5. The heating device of the air conditioning system according to claim 1, characterized in that, The first valve and / or the second valve is a pressure valve, and is used to discharge the air in the electric heater when inflating the electric heater.

6. The heating device of the air conditioning system according to claim 1, characterized in that The electric heater is further connected with an air extraction pump, and the air extraction pump is used to extract the air in the electric heater to reduce the air pressure inside the electric heater; The third valve is a pressure valve, and is used to open to inflate the electric heater when the air pressure inside the electric heater is less than the external air pressure.

7. The heating device of the air conditioning system according to claim 1, characterized in that The electric heater is further connected with an exhaust pipe, and a pressure valve is arranged on the exhaust pipe, and the pressure valve is used to discharge the air in the electric heater when the inflation device inflates the electric heater.

8. The heating device of the air conditioning system according to claim 1, characterized in that, The electric heater is further connected with an exhaust pipe, and an air extraction pump is arranged on the exhaust pipe, the third valve is a pressure valve, the air extraction pump is used to extract the air in the electric heater, and the third valve is used to open when the air pressure inside the electric heater is less than the external air pressure.

9. The heating device of the air conditioning system according to claim 1, characterized in that, A heating tape is arranged outside the electric heater, and is used to heat the electric heater to prevent condensation on the electric heater.

10. An air conditioning system, characterized in that, Comprising a fan, an air conditioner and a heating device according to any one of claims 1-9, one end of the heater in the heating device is connected to the outlet of the fan through a first pipe, and the other end is connected to the air conditioner through a second pipe.

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