Automatic inner cavity blowing and inflating device for heat exchanger

Abstract

The utility model discloses an automatic inner cavity blowing and inflating device for a heat exchanger, relates to the technical field of inflating of heat exchangers, and aims to solve the problems that in the prior art, manual inflating pressure consistency is poor, requirements for operators are high, and misjudgment and leakage are easily caused. The gas injection pipeline and the gas blowing pipeline are connected through a gas inlet pipeline, the gas inlet pipeline is connected with an external high-pressure nitrogen source, the gas injection pipeline is provided with a gas injection electromagnetic valve and a gas injection pressure sensor, the other end of the gas injection pipeline is connected with a first gas outlet pipe, the gas blowing pipeline is provided with a gas blowing electromagnetic valve and a gas blowing pressure sensor, and the other side of the gas blowing pipeline is connected with a second gas outlet pipe. According to the utility model, pressure signals are transmitted to the PLC control system through the gas injection pressure sensor and the gas blowing pressure sensor, and the PLC control system controls the gas injection solenoid valve and the gas blowing solenoid valve, so that when the specified pressure is reached, the nitrogen injection is automatically stopped, and the operation difficulty of workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger inflation, in particular to an automatic inner cavity blowing and inflation device of a heat exchanger. Background Art

[0002] After the production of the tube-fin heat exchanger, nitrogen is needed to be used to blow the inner cavity to remove debris, and then the inner cavity is filled with protective nitrogen to prevent oxidation of the core cavity and maintain pressure for leak detection. At present, the industry's inner cavity blowing and filling devices generally use nitrogen cluster bottles to connect threaded pipes through pressure reducing valves to inflate the core cavity, and then replace them with handheld air guns for manual filling. The filling pressure is determined by workers by observing the mechanical pressure display to determine the product cavity pressure.

[0003] The device has the following disadvantages: 1. After blowing the inner cavity, the gun head needs to be replaced for filling, which has low production efficiency. 2. The consistency of manual filling pressure is poor, which has high requirements for operators and requires accurate adjustment of the filling pressure value, which is easy to cause misjudgment of leakage. 3. There is leakage. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide an automatic inner cavity blowing and inflation device for a heat exchanger, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses an automatic inner cavity blowing and inflation device of a heat exchanger, and the technical solution adopted is, comprising a shell. The shell is provided with an injection pipeline and an air blowing pipeline, the injection pipeline and the air blowing pipeline are connected through an air inlet pipeline, the air inlet pipeline is connected to an external high-pressure nitrogen source, an injection solenoid valve and an injection pressure sensor are provided on the injection pipeline, the other end of the injection pipeline is connected to a first air outlet pipe, an air blowing solenoid valve and an air blowing pressure sensor are provided on the air blowing pipeline, the other side of the air blowing pipeline is connected to a second air outlet pipe, a PLC control system is provided inside the shell, the PLC control system is electrically connected to the injection solenoid valve, the injection pressure sensor, the air blowing solenoid valve and the air blowing pressure sensor respectively, and the PLC control system has a built-in program.

[0006] As a preferred technical solution of the utility model, an injection solenoid valve is provided on the injection pipeline near the air inlet pipeline, an injection pressure sensor is provided on the injection pipeline near the first air outlet pipe, an blowing solenoid valve is provided on the blowing pipeline near the air inlet pipeline, and an blowing pressure sensor is provided on the blowing pipeline near the second air outlet pipe. The on and off of the injection solenoid valve and the blowing solenoid valve are used to switch between the injection mode and the blowing mode.

[0007] As a preferred technical solution of the utility model, a control panel is provided on the shell, a warning light is provided above the control panel, the control panel and the warning light are electrically connected to the PLC control system, the control panel will display the working status of different modes, the on and off status of the air injection solenoid valve and the air blowing solenoid valve, the pressure status of the air injection sensor and the air blowing sensor, and the warning light can judge the quality of the product through analysis of the PLC control system shown, and display it by lighting up different lights.

[0008] As a preferred technical solution of the utility model, a remote controller is provided outside the shell, and the remote controller is electrically connected to the PLC control system. The remote controller can control the switching of blowing the inner cavity, filling with nitrogen and pausing, which is easy to operate.

[0009] As a preferred technical solution of the utility model, a gas injection handle is provided at the end of the first gas outlet pipe, which is convenient for operators to hold.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the utility model transmits pressure signals to the PLC control system through the gas injection pressure sensor and the gas blowing pressure sensor, and the PLC control system controls the gas injection solenoid valve and the gas blowing solenoid valve, so that when the inside of the heat exchanger reaches a specified pressure, the injection of nitrogen is automatically stopped, thereby reducing the operating difficulty of the staff, and no judgment is required for the employees, and the operation can be carried out after simple training. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is an enlarged view of point A of the utility model;

[0013] Figure 3 This is an enlarged view of the remote controller of the utility model.

[0014] In the figure: 1. Shell; 101. Control panel; 102. Warning light; 2. Air inlet pipeline; 3. Air injection pipeline; 301. Air injection solenoid valve; 302. Air injection pressure sensor; 303. First air outlet pipe; 304. Air injection handle; 4. Air blowing pipeline; 401. Air blowing solenoid valve; 402. Air blowing pressure sensor; 403. Second air outlet pipe; 5. Remote control; 6. PLC control system. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0016] like Figures 1 to 3 As shown, the utility model discloses an automatic inner cavity blowing and inflation device of a heat exchanger, and the technical scheme adopted is, comprising a shell 1, an air injection pipe 3 is fixed in the shell 1, an air blowing pipe 4 is provided on the inner wall of the shell 1 under the air injection pipe 3, both ends of the air injection pipe 3 and the air blowing pipe 4 are quick-clamp connectors, the air injection pipe 3 and the air blowing pipe 4 are connected with an air intake pipe 2 through a quick-clamp connector, the other end of the air intake pipe 2 extends to the outside of the shell 1 and is connected to a high-pressure nitrogen source, the right side of the air injection pipe 3 is connected with a first air outlet pipe 303 through a quick-clamp connector, the other end of the first air outlet pipe 303 is provided with an air injection handle 304, an air injection solenoid valve 301 is provided on the air injection pipe 3 near the air intake pipe 2, and an air injection pressure sensor 302 is provided on the air injection pipe 3 near the first air outlet pipe 303.

[0017] As a preferred technical solution of the present utility model, the right side of the blowing pipe 4 is connected to the second air outlet pipe 403 through a quick-connect connector, a blowing solenoid valve 401 is provided on the blowing pipe 4 near the air inlet pipe 2, a blowing pressure sensor 402 is provided on the blowing pipe 4 near the second air outlet pipe 403, a PLC control system 6 is provided at the bottom of the shell 1, and the injection solenoid valve 301, the injection pressure sensor 302, the blowing solenoid valve 401 and the blowing pressure sensor 402 are connected to the PLC control system The shell 1 is electrically connected to the PLC control system 6, a control panel 101 is provided on the outside of the shell 1, a warning light 102 is provided on the shell 1 on the control panel 101, a remote controller 5 is provided on the outside of the shell 1, the remote controller 5 control panel 101 and the warning light 102 are electrically connected to the PLC control system 6, there are two warning lights 102, a green light on the left and a yellow light on the right, and three buttons are provided on the remote controller 5, which are a cavity blowing key for controlling the on and off of the air blowing solenoid valve 401, a nitrogen filling key for controlling the on and off of the air injection solenoid valve 301, and a pause key.

[0018] The working principle of the utility model is as follows: when the inner cavity of the heat exchanger is filled with protective nitrogen, firstly, the input parameters are selected on the control panel 101, and the second air outlet pipe 403 is connected to the core pipe port of the heat exchanger, and the inner cavity blowing button is pressed on the remote control 5, and the PLC control system 6 controls the air blowing solenoid valve 401 to open, and the high-pressure nitrogen is blown into the interior of the heat exchanger through the air blowing pipe 4 and the second air outlet pipe 403, and solid particles and other debris are removed. After the program setting time is reached, the air blowing solenoid valve 401 is automatically closed, and the air blowing pressure sensor 402 detects the pressure change of the whole process and displays it on the control panel 101, and then the second air outlet pipe 403 is separated from the heat exchanger, and the inlet and outlet pipe ports of the heat exchanger core are blocked, and the air injection handle is turned on. 304 is connected to the core of the heat exchanger. Press the nitrogen filling button of the remote control 5, the PLC control system 6 controls the gas injection solenoid valve 301 to open, and nitrogen is filled into the heat exchanger. The gas injection pressure sensor 302 detects the internal pressure of the heat exchanger. When the preset filling time is reached, the gas injection solenoid valve 301 will be closed to stop the gas injection. The gas injection pressure sensor 302 confirms the internal pressure of the heat exchanger and transmits the signal to the PLC control system 6 for calculation and comparison. Then, the gas injection solenoid valve 301 is opened for the second time to perform secondary gas injection. When the pressure is consistent with the set pressure, the PLC control system 6 will close the gas injection solenoid valve 301 and the gas injection is completed. When a pressure error is detected, the yellow light is on and the heat exchanger is unqualified. Otherwise, the green light is on.

[0019] The circuits and mechanical connections involved in the present utility model are conventional means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, which belong to common knowledge.

[0020] Components not described in detail herein are prior art.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger automatic inner cavity blowing and inflation device, comprising a housing (1), characterized in that: The shell (1) contains an injection pipeline (3) and an air blowing pipeline (4). The injection pipeline (3) and the air blowing pipeline (4) are connected via an air inlet pipeline (2). The air inlet pipeline (2) is connected to an external high-pressure nitrogen source. The injection pipeline (3) is provided with an injection solenoid valve (301) and an injection pressure sensor (302). The other end of the injection pipeline (3) is connected to a first air outlet pipe (303). The air blowing pipeline (4) is provided with an air blowing solenoid valve (401) and an air blowing pressure sensor (402). The other end of the air blowing pipeline (4) is connected to a second air outlet pipe (403). A PLC control system (6) is provided inside the shell (1). The PLC control system (6) is electrically connected to the injection solenoid valve (301), the injection pressure sensor (302), the air blowing solenoid valve (401) and the air blowing pressure sensor (402) respectively.

2. The heat exchanger automatic inner cavity blowing and inflation device according to claim 1, characterized in that: A gas injection solenoid valve (301) is provided on the gas injection pipeline (3) near the end of the gas inlet pipeline (2), and a gas injection pressure sensor (302) is provided on the gas injection pipeline (3) near the end of the first gas outlet pipe (303).

3. The heat exchanger automatic inner cavity blowing and inflation device according to claim 2, characterized in that: An air blowing solenoid valve (401) is provided on the air blowing pipeline (4) near the end of the air inlet pipeline (2), and an air blowing pressure sensor (402) is provided on the air blowing pipeline (4) near the end of the second air outlet pipe (403).

4. The automatic inner cavity blowing and inflation device of a heat exchanger according to claim 1, characterized in that: A control panel (101) is provided on the housing (1), a warning light (102) is provided above the control panel (101), and the control panel (101) and the warning light (102) are electrically connected to the PLC control system (6).

5. The heat exchanger automatic inner cavity blowing and inflation device according to claim 4, characterized in that: A remote controller (5) is provided outside the housing (1), and the remote controller (5) is electrically connected to the PLC control system (6).

6. The heat exchanger automatic inner cavity blowing and inflation device according to claim 2, characterized in that: An air injection handle (304) is provided at the end of the first air outlet pipe (303).

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