CN201100800Y - A refrigerant recovery and filling machine - Google Patents

Abstract

The utility model discloses a control valve that collects solenoid valves, check valves, ball valves and other control valves on a whole valve body, that is, the confluence center (the dotted line frame part in Fig. 1), and connects the control valves in series through the internal channel. , There is no separate valve body for each control valve in the confluence center, only external related interfaces, the suction port of the recovery pipeline is equipped with a micro-pressure pressure switch, and a gas-liquid two-phase double-port cylinder valve is installed on the refrigerant tank, with error display Function and stop all functions of the refrigerant recovery filling machine. The utility model refrigerant recycling filling machine is a kind of simple structure, safe and reliable, complete filling refrigerant recycling filling machine.

Description

A refrigerant recovery and filling machine

technical field

The utility model relates to a device for purifying, recovering and filling system refrigerant, in particular to a refrigerant recovery and filling machine.

Background technique

The refrigerant recovery and filling machine is composed of heat exchanger, dry filter, compressor, vacuum pump, oil separator, condenser, refrigerant tank, control valve, connecting pipeline, operation panel, etc. (see Figure 1), mainly through suction Liquid (gas/liquid), heat exchange gasification, oil filtration, dry filtration, compression exhaust, oil return, heat exchange cooling, condensation and other processes purify the refrigerant and recycle it into the refrigerant tank, then vacuumize the system, and finally The system is filled with refrigeration oil and refrigerant. The refrigerant recovery and filling machines currently on the market mainly have the following deficiencies:

1. Solenoid valves, one-way valves, ball valves and other control valves are mainly connected directly through pipelines, so there are many leak points, difficult leak detection, troublesome installation, messy pipeline connections, poor shock resistance and safety;

2. The recovery method is mainly manual or timing. The recovery is not complete, and a small part of the refrigerant is likely to remain in the system. Therefore, the vacuum pump is operated under positive pressure when the system is initially vacuumed, and the life of the vacuum pump is likely to be reduced or even damaged;

3. During the recovery process, a small amount of non-condensable air is often easily collected, and finally gathers in the upper part of the refrigerant tank. Therefore, the pressure of the refrigerant tank continues to rise, which has a certain impact on the recovery of the refrigerant. At the same time, it is not suitable for gaseous filling;

4. The computer control system has no invalid control by misoperation or unreasonable operation, which may easily cause confusion in computer control.

Contents of the invention

The utility model provides a refrigerant recovery and filling machine with simple structure, safety and reliability, and complete filling.

A refrigerant recovery and filling machine, including a frame, a filling system, a recovery system and a control system. The filling system includes a refrigerant tank, a refueling bottle and a vacuum pump. The recovery system includes a heat exchanger, a dry filter, a compressor, and an oil separation system. Condenser, condenser, the control system is composed of an operation panel, several solenoid valves, several one-way valves and several ball valves. The control system is centrally arranged in a confluence center, and the valves of the control system are connected in series through internal channels. Together, the outer periphery of the confluence center is provided with interfaces for communicating with various pipelines.

The pipeline suction port of the recovery system is provided with a micro-pressure switch. When the system pressure exceeds 0.06MPa, the recovery function can be started. When the system pressure is lower than 0.02MPa, the recovery process will automatically end, and then enter the oil discharge process. If the system pressure continues to rise to more than 0.06MPa during the oil discharge process, the recovery process will automatically start again, and the cycle will stop until the refrigerant is completely recovered; therefore, it is impossible to directly start the vacuum function when the refrigerant is not fully recovered, thereby protecting the vacuum pump. . Similarly, it is impossible for the system to directly start the recovery function under normal pressure or even vacuum conditions, so the recovery operation can be skipped and directly entered into the next step to improve work efficiency.

The refrigerant tank is provided with a double-port steel cylinder valve, and the steel cylinder valve has a liquid phase valve and a gas phase valve. Both the liquid phase valve and the gas phase valve are connected to the interior of the refrigerant tank through pipelines, and the pipeline connecting the liquid phase valve extends into the bottom of the refrigerant tank to ensure No air is injected into the system, and the pipe connecting the gas phase valve does not extend into the bottom of the refrigerant tank, but is directly connected to the upper part of the refrigerant tank, which can be used to directly discharge non-condensable air.

The cylinder valve is provided with a safety valve, which will automatically discharge when the pressure in the refrigerant tank exceeds the specified pressure, so as to ensure safety. Therefore, with the double-port cylinder valve on the refrigerant tank, the purity of the refrigerant in the refrigerant tank can be guaranteed, and the gas/liquid two-phase filling requirements can be realized, without the cumbersome method of turning the refrigerant tank upside down or upside down in the past.

The operation panel is provided with an error display device for misoperation.

The operation panel is provided with an automatic stop device for misoperation.

The utility model adopts the confluence center to integrate various control valves such as solenoid valves, one-way valves, ball valves, etc., and connects them in series through the internal passage, without setting a separate valve body for each control valve, only in the confluence It only needs to set the external relevant interface in the center, which greatly reduces the connection and interface, and can be used as an independent component for leak detection and testing. Compared with existing products, it has greatly improved in terms of installation, leak detection, appearance, and safety. . At the same time, by adding the error display function of unreasonable operation or misoperation and the function of automatically stopping all operations, the control function of the equipment has been improved, and the safety performance of the system has been greatly improved.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the present utility model;

Detailed ways

As shown in Figure 1, a refrigerant recovery and filling machine includes a frame, a filling system, a recovery system and a control system, the filling system includes a refrigerant tank 41, a refueling bottle 14 and a vacuum pump 34, and the recovery system includes a heat exchanger 33 , dry filter 31, compressor 47, oil separator 60, condenser 53, the control system is composed of an operation panel, several solenoid valves, several one-way valves and several ball valves, and the control system is centrally arranged in a confluence center 50 Inside, the valves of the control system are connected in series through internal passages, and the outer periphery of the confluence center 50 is provided with interfaces for connecting various pipelines. The pipeline suction port of the recovery system is provided with a micro-pressure pressure switch 11, and the tank mouth of the refrigerant tank 41 is provided with a double-port steel cylinder valve 51, and the steel cylinder valve 51 has a liquid phase valve and a gas phase valve, both of which pass through the pipeline The pipeline connected to the inside of the refrigerant tank 41 and connected to the liquid phase valve extends into the bottom of the refrigerant tank 41 , and a safety valve is provided on the double-port steel cylinder valve 51 .

The mode of work of the present utility model is as follows:

1. Recovery/drainage/circulation process:

Open the high-pressure valve 9 and the low-pressure valve 10, select the "recovery" function on the operation panel, the solenoid valve 17 is automatically opened, and the recovery/circulation process starts through the recovery system. When the recovery process is completed, it automatically switches to the "oil discharge" process, and the equipment automatically discharges the waste oil recovered from the system. When the oil discharge is finished, if the pressure of the remaining refrigerant in the system increases, the device will automatically return to the "recovery" process to recover the refrigerant through the control of the micro-pressure switch 11, and so on until the refrigerant is completely recovered.

2. Vacuum pumping process:

After completing the recycling process, the electromagnetic valve 17 is automatically closed, and at the same time the electromagnetic valve 18 is automatically opened, the vacuum pump 34 starts to run, and the equipment automatically enters the vacuuming process. After the time is up, the vacuum pump 34 shuts down automatically, and the electromagnetic valve 18 is automatically closed, and the vacuuming is completed. Close the high pressure valve 9 and low pressure valve 10, check the vacuum value of the high and low pressure gauges on the operation panel, and check whether there is leakage in the system or external connections.

3. The process of filling new refrigeration oil:

After completing the vacuuming process, open the valve before the refueling bottle 14 and start refueling, close the valve after filling to a certain amount, and the refueling process ends. This process is a manual operation, you can choose to add or skip according to your needs.

4. Refrigerant filling process:

After completing the refueling process, select the "Refueling" function on the operator panel. At this moment, electromagnetic valve 19 is opened automatically, and all the other are automatically closed, and the filling process is started through the filling system, and when filling by required amount is completed, electromagnetic valve 19 is automatically closed. Close high pressure valve 9 and low pressure valve 10. So far, the whole work process is over.

Claims (6)

1. refrigerant recovering charging machine, comprise frame, loading system, recovery system and control system, loading system comprises refrigerant jar (41), bottle oiler (14) and vavuum pump (34), recovery system comprises heat exchanger (33), device for drying and filtering (31), compressor (47), separator (60), condenser (53), control system is by guidance panel, several magnetic valves, several check valves and several ball valves are formed, it is characterized in that: described control system is concentrated and to be arranged at one and to conflux in the center (50), each valve of control system is serially connected by the inner passage, and the center of confluxing (50) periphery is provided with the interface that is communicated with each pipeline.

2. refrigerant recovering charging machine as claimed in claim 1 is characterized in that: the pipeline suction inlet of described recovery system is provided with minute-pressure pressure switch (11).

3. refrigerant recovering charging machine as claimed in claim 1, it is characterized in that: described refrigerant jar (41) is provided with twoport steel cylinder valve (51), steel cylinder valve (51) has liquid phase valve and gas valve, liquid phase valve and gas valve all are communicated with refrigerant jar (41) inside by pipeline, and the pipeline that connects liquid phase valve stretches into refrigerant jar (41) bottom.

4. refrigerant recovering charging machine as claimed in claim 3 is characterized in that: described steel cylinder valve (51) is provided with safety valve.

5. refrigerant recovering charging machine as claimed in claim 1 is characterized in that: described guidance panel is provided with the maloperation display unit of makeing mistakes.

6. refrigerant recovering charging machine as claimed in claim 1 is characterized in that: described guidance panel is provided with the maloperation auto-stopper.

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