Frost crack prevention device for coil pipe of air conditioning unit

Abstract

The utility model discloses an air conditioning unit coil pipe frost crack prevention device, which relates to the technical field of heating ventilation air conditioners and comprises a tray and a drainage control assembly fixed in the middle of the tray. When the air conditioning unit coil pipe frost crack prevention device is used, after the water inlet pipe water temperature detected by the water inlet temperature sensor and the water outlet pipe water temperature detected by the water outlet temperature sensor reach the preset threshold value and last for a period of time, the controller sends out a drainage signal; when the electromagnetic valves of the water inlet pipe and the water outlet pipe are closed, the electromagnetic valves of the water drainage branch and the ventilation branch are opened at the same time, and water in the water passing coil pipe is automatically drained so as to prevent the water passing coil pipe from being frozen to crack due to accumulated water. The projection of the water passing coil pipe on the plumb plane is a downward inclined water pipe, and the upper water pipe and the lower water pipe of the water passing coil pipe are connected end to end and arranged in a staggered mode; compared with a coil pipe bundle which is horizontally arranged in the prior art, accumulated water in the water passing coil pipe can be completely emptied under the action of gravity.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, ventilation and air conditioning, in particular to a device for preventing a coil from freezing and cracking an air conditioning unit. Background Art

[0002] At present, modular air-conditioning units, as the terminal products of central air-conditioning systems, are widely used in hospitals, tobacco factories, workshops and other places that require air conditioning. The water-passing coils of the surface cooler of modular air-conditioning units can flow cold water to provide cooling for the air-conditioned environment, or hot water to provide heat for the air-conditioned environment, so as to adjust the temperature and humidity of the air-conditioned environment and provide the air-conditioned environment required by users.

[0003] When used in winter, the circulating water in the heat exchange coil must be drained in the event of shutdown or failure to ensure that the heat exchange coil is not frozen and cracked. The existing drainage method is to drain the accumulated water in the coil through a drain valve set at a low point of the heat exchange coil. However, it is found in actual projects that the accumulated water in the coil cannot be completely drained due to the horizontal arrangement of the coil bundle. This part of the accumulated water can easily cause the heat exchange coil to freeze and crack in winter.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and an air-conditioning unit coil anti-freezing and cracking device is proposed. Utility Model Content

[0005] The utility model aims to provide a device for preventing the coil from freezing and cracking of an air-conditioning unit, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air-conditioning unit coil anti-freezing and cracking device, comprising a tray and a drainage control component, a drainage control component is fixed in the middle of the tray, the drainage control component comprises a surface cooler, a water coil, fins, a heater, a water inlet pipe, a water inlet temperature sensor, a drainage branch, a water outlet pipe, a water outlet temperature sensor and a ventilation branch, a water coil is arranged inside the surface cooler, and several fins are engaged in the middle of the water coil, and the fins are fixedly connected to the bottom of the heater, the water inlet pipe is connected at the inlet of the water coil, and the water inlet pipe is connected to the water coil through the water inlet temperature sensor, and the bottom of the water inlet pipe is connected to the drainage branch, the water outlet pipe is connected at the outlet of the water coil, and the water outlet pipe is connected to the water coil through the water outlet temperature sensor, and the top of the water outlet pipe is connected to the ventilation branch.

[0007] Furthermore, the projection of the water-passing coil on the plumb plane is a downwardly inclined water pipe, and the upper and lower water pipes of the water-passing coil are connected end to end and arranged in a staggered manner.

[0008] Furthermore, the water inlet pipe, drainage branch, water outlet pipe and ventilation branch are respectively controlled by corresponding valve bodies for on-off control.

[0009] Furthermore, a bracket is welded and fixed on the back of the tray, and a controller is fixed on the side of the bracket, and the controller is electrically connected to the solenoid valve bodies that respectively control the water inlet pipe, the drainage branch, the water outlet pipe and the ventilation branch.

[0010] Furthermore, a return air box with a closed box structure is welded and fixed on the back of the bracket, and a filter is screwed fixed on the outer side of the return air box air inlet.

[0011] Furthermore, a UV lamp is arranged inside the filter, and the UV lamp is placed horizontally inside the air inlet of the return air box.

[0012] Furthermore, a motor is fixed inside the return air box, and a wind wheel is fixedly connected to the output end of the motor.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. When the utility model is in use, when the difference between the water temperature of the water inlet pipe detected by the water inlet temperature sensor and the water temperature of the water outlet pipe detected by the water outlet temperature sensor reaches a predetermined threshold and lasts for a period of time, the controller sends a drainage signal, closes the solenoid valves of the water inlet pipe and the water outlet pipe, and opens the solenoid valves of the drainage branch and the ventilation branch at the same time, automatically draining the water in the water coil to prevent the water coil from being frozen and cracked due to accumulated water. The projection of the water coil of the present application on the plumb plane is a downward inclined water pipe, and the upper and lower water pipes of the water coil are connected end to end and arranged in a staggered manner. Compared with the horizontally arranged coil bundles in the prior art, the accumulated water in the water coil can be completely drained under the action of gravity. In addition, the residual water in the coil bundle can be evaporated by heating the external fins of the bundle by the heater, thereby ensuring that there is no residual water in the coil bundle.

[0015] 2. When the utility model is in use, the controller drives the wind wheel to rotate through the motor after receiving the control command, and the external air is sucked into the return air box through the filter. The filter can filter dust and other impurities in the air, and the setting of the UV lamp can sterilize and disinfect the incoming air, remove debris and odors, and make the air blown out through the surface cooler fresher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall external structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the drainage control component of the utility model;

[0018] Figure 3 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0019] In the figure: 1. tray; 2. drainage control assembly; 201. surface cooler; 202. water coil; 203. fins; 204. heater; 205. water inlet pipe; 206. water inlet temperature sensor; 207. drainage branch; 208. water outlet pipe; 209. water outlet temperature sensor; 210. ventilation branch; 3. bracket; 4. controller; 5. return air box; 6. filter; 7. UV lamp; 8. motor; 9. wind wheel. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0021] like Figure 1 to Figure 2As shown, an air conditioning unit coil anti-freezing cracking device includes a tray 1 and a drainage control assembly 2. The drainage control assembly 2 is fixed in the middle of the tray 1. The drainage control assembly 2 includes a surface cooler 201, a water coil 202, fins 203, a heater 204, a water inlet pipe 205, a water inlet temperature sensor 206, a drainage branch 207, a water outlet pipe 208, a water outlet temperature sensor 209 and a ventilation branch 210. The surface cooler 201 is provided with a water coil 202, and the middle of the water coil 202 is engaged with several fins 203, and the fins 203 The projection of the water coil 202 on the plumb plane is a downwardly inclined water pipe, and the upper and lower water pipes of the water coil 202 are connected end to end and arranged alternately. The inlet of the water coil 202 is connected to a water inlet pipe 205, and the water inlet pipe 205 is connected to the water coil 202 through a water inlet temperature sensor 206, and the bottom of the water inlet pipe 205 is connected to a drainage branch 207, and the outlet of the water coil 202 is connected to a water outlet pipe 208, and the water outlet pipe 208 is connected to the water coil 202 through a water outlet temperature sensor 209, and The top of the water outlet pipe 208 is connected to a ventilation branch 210. The water inlet pipe 205, the drainage branch 207, the water outlet pipe 208 and the ventilation branch 210 are respectively controlled by the corresponding valve bodies. When the difference between the water temperature of the water inlet pipe 205 detected by the water inlet temperature sensor 206 and the water temperature of the water outlet pipe 208 detected by the water outlet temperature sensor 209 reaches a predetermined threshold and lasts for a period of time, the controller 4 sends a drainage signal, closes the solenoid valves of the water inlet pipe 205 and the water outlet pipe 208, and opens the solenoid valves of the drainage branch 207 and the ventilation branch 210, automatically The water in the water coil 202 is drained to prevent the water coil 202 from being frozen and cracked due to the accumulated water. The projection of the water coil 202 on the plumb plane of the present application is a downwardly inclined water pipe, and the upper and lower water pipes of the water coil 202 are connected end to end and arranged in a staggered manner. Compared with the horizontally arranged coil bundle in the prior art, the accumulated water in the water coil 202 can be completely drained under the action of gravity. In addition, the heater 204 can heat the external fins 203 of the tube bundle to evaporate the residual water in the coil bundle, ensuring that there is no residual water in the coil bundle;

[0022] like Figures 1 to 3As shown, a bracket 3 is welded and fixed on the back of the tray 1, and a controller 4 is fixed on the side of the bracket 3, and the controller 4 is electrically connected to the solenoid valve bodies that respectively control the water inlet pipe 205, the drainage branch 207, the water outlet pipe 208 and the ventilation branch 210. A return air box 5 of a closed box structure is welded and fixed on the back of the bracket 3, and a filter 6 is screwed fixed to the outer side of the air inlet of the return air box 5, a UV lamp 7 is arranged on the inner side of the filter 6, and the UV lamp 7 is horizontally placed on the inner side of the air inlet of the return air box 5, a motor 8 is fixed inside the return air box 5, and a wind wheel 9 is fixedly connected to the output end of the motor 8. After receiving the control command, the controller 4 drives the wind wheel 9 to rotate through the motor 8, and the external air is sucked into the return air box 5 through the filter 6. The filter 6 can filter impurities such as dust in the air, and the setting of the UV lamp 7 can sterilize and disinfect the incoming air, remove debris and odors, so that the air blown out through the surface cooler 201 is fresher.

[0023] Working principle: When using the anti-freezing cracking device for the coil of the air conditioner unit, when in use, the controller 4 receives the control command and drives the wind wheel 9 to rotate through the motor 8, and the external air is sucked into the return air box 5 through the filter 6. The filter 6 can filter the dust and other impurities in the air, and the setting of the UV lamp 7 can sterilize and disinfect the incoming air, remove debris and odors, so that the wind blown out through the surface cooler 201 is fresher. When the difference between the water temperature of the water inlet pipe 205 detected by the water inlet temperature sensor 206 and the water temperature of the water outlet pipe 208 detected by the water outlet temperature sensor 209 reaches a predetermined threshold and lasts for a period of time, the controller 4 sends a drainage signal, and closes the water inlet pipe 206. 05 and the solenoid valve of the water outlet pipe 208 are opened at the same time as the solenoid valve of the drainage branch 207 and the ventilation branch 210, and the water in the water coil 202 is automatically discharged to prevent the water coil 202 from being frozen and cracked due to the accumulated water. The projection of the water coil 202 of the present application on the plumb plane is a downward inclined water pipe, and the upper and lower water pipes of the water coil 202 are connected end to end and arranged in a staggered manner. Compared with the horizontally arranged coil bundles in the prior art, the accumulated water in the water coil 202 can be completely drained under the action of gravity. In addition, the heater 204 can heat the external fins 203 of the tube bundle, so that the residual water in the coil bundle is evaporated by heat, ensuring that there is no residual water in the coil bundle.

[0024] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An air conditioning unit coil anti-freezing cracking device, characterized in that: The invention comprises a tray (1) and a drainage control assembly (2), wherein the drainage control assembly (2) is fixed in the middle of the tray (1), and the drainage control assembly (2) comprises a surface cooler (201), a water-passing coil (202), fins (203), a heater (204), a water inlet pipe (205), a water inlet temperature sensor (206), a drainage branch (207), a water outlet pipe (208), a water outlet temperature sensor (209) and a ventilation branch (210), wherein the surface cooler (201) is provided with a water-passing coil (202), and the middle of the water-passing coil (202) is engaged with a plurality of fins (203). ), and the fin (203) is fixedly connected to the bottom of the heater (204); the inlet of the water-passing coil (202) is connected to a water inlet pipe (205), and the water inlet pipe (205) is connected to the water-passing coil (202) through a water inlet temperature sensor (206); the bottom of the water inlet pipe (205) is connected to a drainage branch (207); the outlet of the water-passing coil (202) is connected to a water outlet pipe (208), and the water outlet pipe (208) is connected to the water-passing coil (202) through a water outlet temperature sensor (209); and the top of the water outlet pipe (208) is connected to a ventilation branch (210).

2. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 1, characterized in that: The projection of the water-passing coil (202) on the plumb plane is a water pipe that tilts downward, and the upper and lower water pipes of the water-passing coil (202) are connected end to end and arranged in a staggered manner.

3. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 1, characterized in that: The water inlet pipe (205), the drainage branch (207), the water outlet pipe (208) and the ventilation branch (210) are respectively controlled on and off by corresponding valve bodies.

4. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 1, characterized in that: A bracket (3) is welded and fixed on the back of the tray (1), and a controller (4) is fixed on the side of the bracket (3), and the controller (4) is electrically connected to the solenoid valve bodies that respectively control the water inlet pipe (205), the drainage branch (207), the water outlet pipe (208) and the ventilation branch (210).

5. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 4, characterized in that: A return air box (5) with a closed box structure is welded and fixed on the back of the bracket (3), and a filter screen (6) is screwed fixed on the outer side of the air inlet of the return air box (5).

6. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 5, characterized in that: A UV lamp (7) is arranged inside the filter screen (6), and the UV lamp (7) is horizontally placed inside the air inlet of the return air box (5).

7. The device for preventing the coil from freezing and cracking of an air conditioner unit according to claim 5, characterized in that: A motor (8) is fixed inside the return air box (5), and a wind wheel (9) is fixedly connected to the output end of the motor (8).

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