KR20030068449A - Vacuum pump and method for operatively setting air conditioner using the vacuum pump - Google Patents

Abstract

In the construction of an air conditioner, it is possible to provide a vacuum pump and an air conditioner that can operate in a simple and short time while suppressing adverse effects on the environment. The inside of the cylinder 15 is divided into two chambers by the piston 16, and the intake port 20 and the exhaust port 19 which arrange | position a check valve in the cylinder top dead center position and bottom dead center position of these two chambers are provided, respectively. When the exhaust ports 19 are connected by operating the piston 16 in either direction, the exhaust port 19 side in the cylinder is pressurized by discharging the gas inside the cylinder, thereby connecting the intake port 20. In this case, the intake port 20 side in the cylinder is in a negative pressure state.

Description

VACUUM PUMP AND METHOD FOR OPERATIVELY SETTING AIR CONDITIONER USING THE VACUUM PUMP}

The present invention relates to a vacuum pump required for the construction of a separate air conditioner for joining an indoor unit and an outdoor unit in a connecting pipe, and a construction method of an air conditioner using the same.

In the conventional air conditioner construction method, in order to exhaust the air in the indoor unit and the connecting pipe after implementation, the outdoor unit main body is pre-charged with an excess amount of refrigerant gas for air purge, more than a prescribed amount required for the air conditioning function. The refrigerant gas is introduced into the connecting pipe and the indoor unit through the liquid side two-way valve installed in the outdoor unit, and then air and refrigerant gas in the connecting pipe and the indoor unit are discharged from a valve called a service port of the gas-side three-way valve installed in the outdoor unit. It is discharged to the atmosphere.

On the other hand, due to the recent increase in regulations on the environment such as the destruction of the ozone layer and global warming, it is a problem to release the refrigerant gas with high ozone layer destruction coefficient and global warming coefficient at the time of installation of the air conditioner. It is recommended. The electric vacuum pump is connected to a valve called a service port of an outdoor unit gas-side three-way valve, and is supplied with power to operate the electric vacuum pump, thereby sucking and exhausting the connection piping and the air inside the indoor unit, so that the pressure is sufficiently reduced. Thereafter, the refrigerant gas is introduced into the connecting pipe and the indoor unit from the liquid side two-way valve.

However, this electric vacuum pump is considerably difficult to use in bad conditions, for example, on a roof or the like. In addition, the installation method of the vacuum pump took time compared with the method of using the refrigerant gas in the outdoor unit main body.

In addition, although the present inventors have proposed a manual vacuum pump as a complement to the electric vacuum pump, either the manual or the electric vacuum pump can be operated using the operating time and the Bourdon tube vacuum gauge to reach the inside of the connection pipe and the indoor unit. The degree of vacuum was in control.

However, the Bourdon tube type vacuum system is weak to shock, and the zero point is often shifted by some mistakes of the operator. In addition, the minimum scale of vacuum degree is generally large, and it is only a target level for management rather than grasping the reached vacuum degree.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum pump and a method of implementing an air conditioner using the same, in view of the above-mentioned problems, taking into consideration the influence on the environment, and enabling the construction of a simple air conditioner.

1 is a configuration diagram of an air conditioner of the present invention.

2 is a diagram illustrating a configuration of the vacuum pump main body of the present invention and a connection path of the pressure resistant hose.

FIG. 3 is an enlarged view of the main portion α of the vacuum pump shown in FIG. 2.

4 is a schematic configuration diagram of an acceleration sensor provided in the handle of the vacuum pump of the present invention.

5 is a configuration diagram of a check valve disposed in an exhaust port of the present invention.

6 is a cross-sectional view taken along the line AA ′ of the check valve of FIG. 5.

7 is a configuration diagram of a check valve disposed in an intake port of the present invention.

8 is an enlarged view of the main portion β of the vacuum pump shown in FIG. 2.

9 is a configuration diagram of the filter portion of the present invention.

FIG. 10: is a concrete figure which shows the dead space when the piston is located in bottom dead center in the recessed part (gamma) of the vacuum pump shown in FIG.

Fig. 11 is a relation diagram of stroke frequency and internal pressure of the vacuum pump of the present invention.

Fig. 12 is a connection path diagram of the pressure resistant hose connecting the configuration of the vacuum pump main body and the exhaust port side of the present invention.

Fig. 13 is a connection path diagram of the pressure resistant hose connecting the configuration of the vacuum pump main body and the intake port side of the present invention.

Fig. 14 is a relation diagram of stroke frequency and internal pressure of the vacuum pump of the present invention.

Fig. 15 is a connection path diagram of the pressure resistant hose connecting the configuration of the vacuum pump main body and the exhaust port side of the present invention.

Fig. 16 is a connection path diagram of the pressure resistant hose connecting the configuration of the vacuum pump main body and the intake port side of the present invention.

Fig. 17 is a configuration diagram of air flow at the intake port side of the filter portion of the present invention.

18 is an air flow configuration diagram at the exhaust port side of the filter portion of the present invention.

It is a block diagram of the one-touch pipe joint provided in the vacuum pump main body of this invention.

FIG. 20: is a specific figure which shows the dead space when the piston is located in bottom dead center in the main part delta of the vacuum pump shown in FIG.

Fig. 21 is a relation diagram of stroke frequency and internal pressure of the vacuum pump of the present invention.

Fig. 22 is a flowchart until the acceleration sensor of the vacuum pump of the present invention displays the count.

Fig. 23 is a schematic configuration diagram showing an acceleration sensor provided on the handle of the vacuum pump of the present invention.

24 is a schematic view showing a strain gauge of an acceleration sensor of a vacuum pump of the present invention.

Fig. 25 is a detection circuit diagram of a strain gauge of an acceleration sensor of a vacuum pump of the present invention.

Fig. 26 is a relation diagram of stroke frequency and internal pressure of the piston of the vacuum pump of the present invention.

Fig. 27 is a schematic diagram showing a counter in which an acceleration sensor provided in the handle of the vacuum pump of the present invention is incorporated.

Fig. 28 is a schematic diagram showing the manner of the acceleration sensor of the vacuum pump of the present invention.

Fig. 29 is a schematic diagram showing a counter with an acceleration sensor provided in the handle of the vacuum pump of the present invention.

30 is a schematic view showing a system of an acceleration sensor of a vacuum pump of the present invention.

Fig. 31 is a schematic diagram showing a counter in which an acceleration sensor provided in the handle of the vacuum pump of the present invention is incorporated.

32 is a schematic view showing the manner of the acceleration sensor of the vacuum pump of the present invention.

Fig. 33 is a configuration diagram of a refrigeration cycle showing an air conditioner constructed by using the vacuum pump of the present invention.

Fig. 34 is a diagram showing the constitution of the vacuum pump of the present invention and the connection path of the pressure resistant hose.

FIG. 35 is a detailed configuration diagram when the piston shown in FIG. 2 of the vacuum pump of the present invention is in the top dead center position. FIG.

Fig. 36 is a diagram showing the constitution of the vacuum pump of the present invention and the connection path of the pressure resistant hose.

In order to solve the above problems, the present invention is provided with an intake port having a check valve and an exhaust port of the check valve portion respectively located at a top dead center position and a bottom dead center position in a cylinder divided into two chambers, each of which is divided into two chambers, upper and lower, by a piston. When the pistons are operated in any of the up and down directions, when the exhaust ports are connected, the exhaust port side is pressurized by discharging the gas inside the cylinder, and when the intake port is connected, the intake port side in the cylinder is in a negative pressure state. It is a method of implementing a vacuum pump and an air conditioner using the same.

According to the present invention, when the air conditioner is installed, the indoor unit is connected to the outdoor unit through a connection pipe, and then, the first exhaust port is connected to the outdoor unit, which can be used as a pressure pump, and pressurizes the atmosphere to about 5 kg / cm 2. The leak test of the pipe connection can be carried out. Compared with the leak inspection method by the refrigerant filled in the conventional outdoor unit, it is possible to provide a leak inspection method suitable for the environment. Thereafter, by connecting one intake port and using it as an original vacuum pump for reducing pressure, it is possible to reduce the air in the indoor unit and the connection pipe that should be removed in consideration of the reliability of the refrigeration cycle to a sufficient level. These series of operations can be performed manually without relying on electric power.

In addition, the present invention is a vacuum pump in which the intake port side is connected by one connecting port portion to operate the piston in either direction, so that the intake port side is in a negative pressure state, and the reciprocating motion of the piston is counted in this vacuum pump. The sensor can be installed.

According to the present invention, the number of reciprocations of the piston can be reliably counted. Therefore, the piston reciprocating frequency is managed if the capacity of the vacuum pump with respect to the internal volume is known in advance as a database, aiming at the length of the indoor unit and the connecting pipe, for example. Only by doing so, the operator can easily estimate the vacuum degree reached.

In addition, in the present invention, a check valve is disposed at a top dead center position of a cylinder divided into two upper and lower chambers by a piston moving up and down by a handle, an intake port and a check valve through an air conditioner are disposed, and an exhaust port through air is installed, respectively. The bottom dead center position is a vacuum pump equipped with an opening port for opening to the atmosphere capable of intake and exhaust and an air conditioner using the same.

According to the present invention, after the loss becomes negative pressure by operating the piston in the downward direction, the piston is induced to automatically return upward in order to correct the differential pressure between the loss and the compartment by the intake action from the opening port. The upward movement requires little force and facilitates the operation of the piston.

Moreover, embodiment of this invention is described concretely next.

In order to solve the above problems, the vacuum pump of the present invention is divided into two chambers by a piston in a cylinder, and an intake port and an exhaust port each having a check valve disposed at the cylinder top dead center position and the bottom dead center position of the divided two chambers. Even if the pistons are operated in any direction, when the exhaust ports are connected, the exhaust port side in the cylinder is pressurized by discharging the gas inside the cylinder, and the cylinder is connected when the intake port is connected. The intake port side in the vacuum pump is characterized in that the negative pressure state. By using this vacuum pump, when the air conditioner is installed, the indoor unit is connected to the outdoor unit through the connection pipe, and then, the exhaust port is connected to one, so that it can be used as a pressurized pump and pressurized to about 5 kg / cm 2. Compared with the leak inspection method by the refrigerant charged in the outdoor unit which can perform the leak inspection of the piping connection part, the leak inspection method suitable for an environment can be provided. In addition, since the intake port is connected to one and used as a vacuum pump, the oxygen in the air which should be removed in consideration of the reliability of the refrigeration cycle can be reduced to a sufficient level. These series of operations can be performed manually without using electricity.

In addition, a compression coil spring is disposed inside the check valve disposed at the intake port, and the spring constant of the compression coil spring is 0.01 to 0.04 N / mm. This makes it possible to provide a check valve with a sufficiently small minimum operating pressure difference.

In addition, the construction method of the air conditioner according to the present invention is a construction method of the air conditioner when the air conditioner, which is configured by connecting both the indoor unit and the outdoor unit by the connecting pipe, using a vacuum pump, the vacuum pump is inside the cylinder The piston is divided into two chambers and has an intake port and an exhaust port for arranging check valves in each of the upper and lower dead center surfaces of the cylinders of the two compartments, and the exhaust ports are connected to each other as at least a first step. In any direction, the indoor unit and the inside of the connection pipe are pressurized by the gas discharged from the inside of the cylinder, and the intake ports are connected as a second step, so that the indoor unit and the inside of the connection pipe are negative pressure. It is a construction method of the air conditioner characterized by the state.

According to this method, it is possible to use the exhaust port side of the vacuum pump as a pressurizing pump, connect the indoor unit to the outdoor unit through the connecting pipe, and then leak test of the connecting part at atmospheric pressure of about 5 kg / cm 2. Compared with the leak inspection method by the refrigerant filled in the conventional outdoor unit, it is possible to provide a leak inspection method suitable for the environment. In addition, by using the intake port side as a vacuum pump for reducing the pressure, the indoor unit and the inside of the connecting pipe can be brought into a sufficient negative pressure state. Thus, the air conditioner can be constructed while using both the exhaust port side and the intake port side of the vacuum pump effectively.

In addition, a first connecting portion for connecting the exhaust ports, a second connecting portion for connecting the intake ports, a joint portion for joining the first connecting portion and the exhaust port portion, the second connecting portion and the intake port portion are connected It is an implementation method of an air conditioner, characterized in that the junction is provided. In addition, the method of implementing an air conditioner characterized in that the joining portion is detachable. According to this, since the joint part which can be easily attached and detached in intake port and exhaust port is provided, it can be used as a pressurizing pump which performs leak test of a connection part by using an exhaust port side at the time of construction of an air conditioner, Next, by using the intake port side, it can be used as an original vacuum pump for pressure reduction. By providing such a detachable joint, the vacuum pump mechanism function according to the present invention can be divided into a pressurizing device or a depressurizing device.

In addition, the present invention has an intake port and an exhaust port in which a check valve is disposed at the top dead center position and the bottom dead center position of the cylinder of the two chambers by a piston, and each intake port has a connection port portion. Is connected to one by one, and even if the piston is operated in any direction, the differential pressure of the two chambers gradually decays from the beginning, and the intake port side becomes a negative pressure state, and a sensor is provided for counting the reciprocating motion of the piston. It is a vacuum pump. According to this, for example, when the air conditioner is constructed, it is possible to reduce the pressure in the connecting pipe and the inside of the indoor unit from the service port of the three-way valve on the outdoor unit gas side and introduce refrigerant gas from the outdoor unit. Further, since the sensor counts the reciprocating motion of the piston, the degree of vacuum reached on the intake port side can be estimated. For example, aiming at the length of the indoor unit and the connecting pipe in an air conditioner, if the database knows the capacity of the vacuum pump in relation to the internal volume, the operator can easily estimate the vacuum degree reached by managing the reciprocating frequency of the piston. It becomes possible. In addition, the sensor does not need to be particularly concerned about the handling of the vacuum pump, and it is also possible to move the piston by attraction.

In addition, since the sensor is an acceleration sensor, a vacuum pump having a response sensitivity of 1 to 5G, and an acceleration sensor having a response sensitivity of 1 to 5G are used as a sensor for counting the reciprocating motion of the piston, the piston is formed on the inner wall of the cylinder. It is possible to count only the acceleration G at the time of collision. According to this, an acceleration sensor capable of responding to accelerations 1 to 5G can accurately count only the acceleration G when the piston collides with the inner wall of the cylinder, and does not count the double count or the double count in the piston's stroke movement. A sensor with fewer false counts can be provided.

In addition, the acceleration sensor is a vacuum pump configured using a sun spring or a cantilever type support arm, and the sun spring or arm can accurately respond to an acceleration G having a constant directionality due to the reciprocating motion of the piston. According to this, since the acceleration G is subtracted by using a sun spring or a cantilever type support arm, an acceleration sensor capable of accurately responding to a constant directional acceleration G called a reciprocating motion accompanying a piston stroke is provided. can do.

Further, the acceleration sensor is a mechanical type, the method is a vacuum pump of contact pressure type, reed switch type or contact conduction type, and the acceleration sensor is mechanical type of contact pressure type, reed switch type or contact conduction type, so that the structure is relatively simple. You can do it. According to this, the acceleration sensor is mechanical, and the method is called contact pressure type, reed switch type, or contact conduction type. As a result, a relatively simple mechanism structure such as a line spring, a pendulum, and an electrical contact part ensures that the acceleration ( G) can be counted.

In addition, the present invention for solving the above problems, the cylinder is divided into a loss and a base by a piston, the piston is connected to a handle for operating the piston through a support shaft disposed on the loss side, the top dead center of the loss Has an intake port for arranging the check valve in the position and an exhaust port for arranging the check valve, and has an opening port for intake and exhaust in the basement of the cylinder, and by operating the piston in a downward direction, the loss becomes negative pressure. In addition, it is a vacuum pump in which the piston moves upward by the intake action from the opening port. For example, when the air conditioner is installed, the indoor unit is connected to the outdoor unit by the connecting pipe, and then used as a vacuum pump for reducing pressure using the intake port and exhaust port. In addition, the piston is guided to automatically return upward in order to correct the differential pressure between the loss and the basement by the intake action from the opening port. As a result, a constant force is required to operate the piston in the downward direction, but light operation that does not require most of the force in the upward direction is possible. For example, the oxygen in the air, which must be removed in consideration of the reliability of the refrigeration cycle, can be reduced to a sufficient level, and it is very advantageous when the piston is operated manually without depending on the electric type.

In addition, the present invention is a construction method of the air conditioner when the air conditioner installed by connecting both the indoor unit and the outdoor unit by the connecting pipe using a vacuum pump, the vacuum pump is divided into the loss and the basement in the cylinder by the piston. The piston is connected to a handle for operating the piston through a support shaft disposed on the loss side, and has an intake port in which a check valve is disposed at a top dead center position of the loss and an exhaust port for placing a check valve; An opening port capable of intake and exhaust at the base of the cylinder, and the space in the loss chamber formed when the piston is located at the bottom dead center and from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port; Total dead volume inside the cylinder and the cylinder dead dead formed when the piston is located at the top dead center The relationship between the volume and the volume in the total space from the cylinder outlet to the intake port check valve and the exhaust port check valve is Vla / Vlb ≧ 20, and the loss is brought to a negative pressure by operating the piston in a downward direction. After that, it is a construction method of the air conditioner which makes the said indoor unit and the inside of the said connection pipe into a negative pressure state, inducing the piston to move upward by the intake action from the opening port.

In addition, the present invention is a construction method of the air conditioner when the air conditioner installed by connecting both the indoor unit and the outdoor unit by the connecting pipe using a vacuum pump, the vacuum pump is divided into the loss and the basement in the cylinder by the piston. The piston is connected to a handle for operating the piston through a support shaft disposed on the loss side, and has an intake port at which a check valve is disposed at a top dead center position of the loss and an exhaust port at which the check valve is disposed; An opening port capable of intake and exhaust at the base of the cylinder, and the space in the loss chamber formed when the piston is located at the bottom dead center and from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port; A sum total of the volume in the space, the dead space in the cylinder formed when the piston is located at the top dead center, and The relationship between the volume in the total space from the cylinder cylinder outlet to the intake port check valve and the exhaust port check valve is Vla / Vlb≥20, preferably Vla / Vlb≥40, and the piston is operated downward. By doing so, after the loss is brought into a negative pressure state, the indoor unit and the inside of the connecting pipe are brought into a negative pressure state while inducing the piston to move upward by an intake action from the opening port. Air conditioner construction method. According to this method, a sufficient attained vacuum degree is achieved by optimizing the relationship between the pressure reducing mechanism in the cylinder and the dead space which is consequently in the vacuum pump structure of the present invention, and the space volume that can act as the maximum pressure reducing mechanism in the cylinder. Can be obtained. Therefore, it is possible to reduce the oxygen in the air to be removed to a sufficient level in consideration of the reliability of the refrigeration cycle during the installation work of the air conditioner, and complete the construction of the air conditioner in a short time.

In addition, a method of constructing an air conditioner in which a specific gas is introduced into the indoor unit and the connection pipe at the time of installation work, and the air in the indoor unit and the connection pipe is replaced with the specific gas, and the indoor unit and the inside of the connection pipe are put under negative pressure. to be. According to this method, a vacuum pump is used after replacing gas, such as carbon dioxide gas, with air in the indoor unit and the connecting pipe, which is difficult to cause problems in the refrigeration cycle even when remaining in the installation work, so that more reliable installation work can be performed. do.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

Example 1

1 is a configuration diagram of a refrigeration cycle of an air conditioner shown in the embodiment. The refrigeration cycle includes a compressor (1), a four-way valve (2), an outdoor heat exchanger (3), a throttle device (4), a dryer (5), and an indoor heat exchanger (6) as typical components. The compressor (1), the four-way valve (2), the outdoor heat exchanger (3), the throttle device (4), and the dryer (5) are arranged in the outdoor unit (A), and the indoor air exchanger (6) is connected to the indoor unit (B). It is installed.

The outdoor unit A is provided with a liquid side two-way valve 7 and a gas side three-way valve 8. The connecting pipes 9 and 10 connecting the outdoor unit A and the indoor unit B are connected using a liquid side two-way valve 7 and a gas side three-way valve 8, respectively. The liquid side two-way valve has a threaded portion 7a. The openable threaded portion 7a communicates with the outdoor unit A side pipe and the connection pipe 9 by opening the threaded portion 7a. In addition, the gas-side three-way valve 8 has a threaded portion 8a and a service port portion 8b. The openable threaded portion 8a communicates with the outdoor unit A side pipe and the connection pipe 10.

Now, the outdoor unit A and the indoor unit B are connected to the internal and external connection pipes 9 and 10, and the pressure resistant hose 11 is connected to the service port 8b of the gas-side three-way valve 8 of the outdoor unit A. Internal pressure which becomes the connection part which connects the center port 12a of the gauge manifold 12 through this, and connects the low pressure side port 12b of the gauge manifold 12 and a vacuum pump with one intake port by one. Connect with hose (13). The filter part 14 is provided in the path | route.

Fig. 2 shows a schematic diagram for explaining in detail the configuration of the vacuum pump main body and the connection path of the pressure resistant hose.

The vacuum pump has a structure in which an aluminum piston 16 is divided into two chambers inside the cylinder body 15 made of aluminum, and the piston 16 is made of an aluminum handle through a stainless support shaft 17. An acceleration sensor 181 and a primary battery 182 are built in the handle 18 connected to the handle 18, and a display unit 183 is disposed on an upper surface of the handle 18. Signal can be displayed on the display unit 183.

3 is a schematic view showing the main parts of the structure of the handle 18, and a schematic configuration diagram of the acceleration sensor 181 is shown in FIG.

The silicon semiconductor of the acceleration sensor 181 is composed of a thin sensor portion and a large weight portion. In operation, if the acceleration G occurs when the stroke movement of the handle 18 stops, the weight is sensed and the sensor is shifted. Due to this shift, the stress caused by the shift of the sensor unit is detected by the acceleration of the electrical resistance of the diffusion layer formed on the upper part of the sensor unit by the piezo effect of the sensor unit, and converted into a voltage output through the bridge circuit. The total weight of the vacuum pump body is almost 1 kg.

When the piston 16 operates inside the cylinder 15, the check valves 19a, 19b, 20a, and 20b are connected directly to the cylinder body bulkhead serving as the top dead center surface and the bottom dead center surface of the piston 16. At this time, those having the structure shown in Figs. 5 and 6 were used for the exhaust port check valves 19a and 19b, and those shown in Fig. 7 were used for the intake port check valves 20a and 20b. In the exhaust port check valves 19a and 19b, the copper pipe 191 is roll grooved at two places, and the brass valve accommodating seat body 192 is fixed to the groove processing portion 191a. The nylon valve body 193 strikes the valve receiving seat body 192 and stops movement in surface contact with the valve receiving seat body 192 having the inclined surface. In the reverse direction, the groove body 191b stops the movement of the valve body. Thus, a check valve structure is provided in which air flows only in the direction of the arrow. In the intake check valves 20a and 20b, the copper pipe 201 is roll grooved at two places, and the brass valve receiving seat 202 is fixed to the groove processing part 201a. The compressed coil spring body 203 is bonded to the film plate 204, the nylon film plate 204 collides with the brass valve accommodation sheet body 205 by the compression coil spring force, and the flat sheet body 205 And the film plate 202 close the flow path in surface contact, and a check valve structure is provided in which air flows only in the direction of the arrow. The compression coil spring body 203 uses a spring constant of 0.04 N / mm made of SUS304, so that the minimum operating pressure difference can be set to 10 torr. The brass valve accommodating seat body 205 is fixed to the groove processing portion 201b, and the inlet flow passage area is narrowed in the upstream flow path of the valve accommodating seat body 205 for the purpose of increasing the pressure difference required for the operation of the valve even slightly. The taper part is provided.

In addition, shaft seal 21a, 21b is provided in the part which the support shaft 17 contact | connects the cylinder 15 partition wall, and is comprised by making O-ring made of HNBR double. Also in the piston 16, the shaft seal 22 is arrange | positioned by the HNBR zero ring in the part which contact | connects the inner wall of the cylinder 15. As shown in FIG.

The internal structure of the filter part 14 is shown in FIG. The main body of the filter unit 14 has a cylindrical shape, and the air that enters the inside immediately hits the wall 141 and changes its flow in the circumferential direction, passes through the cylindrical pulp membrane 142 fixedly disposed therein, and enters the inner path, Finally introduced to the outside. Therefore, when air passes from the outer circumferential path to the inner path side, garbage is collected. In addition, the collected waste can be confirmed by the door by making the cylinder 143 of the filter part 14 into transparent glass or resin.

Next, the operation of the vacuum pump will be described. First, when the handle 18 is pulled in the a direction (top dead center side), the air inside the indoor unit B and the connection pipe 9 is discharged from the service port section 8b to the pressure resistant hose 11, the gauge manifold 12, From the internal pressure hose 13, air is drawn into the cylinder 14b through the check valve 20b serving as the intake port, and the air in the cylinder 14a is discharged to the atmosphere through the check valve 19a serving as the exhaust port. do. Next, when the handle 18 is pressed in the b direction (lower dead center side), the air inside the indoor unit B and the connection pipe 9 is discharged from the service port section 8b to the pressure resistant hose 11, the gauge manifold 12, and the internal pressure. The hose 13 is drawn into the cylinder 14a through the check valve 20a serving as the intake port, and the air in the cylinder 14b is discharged to the atmosphere through the check valve 19b serving as the exhaust port. . Next, the handle 18 is reciprocated so that the handle 18 is pulled in the a direction (top dead center side) again, and the piston 16 is synchronized. At this time, while the four check valves are replaced in the cylinder, the piston is constantly depressurized even if the piston moves in one of the a and b directions, and finally a sufficient negative pressure state can be achieved. Strictly, when the handle 18 reciprocates, it is possible to continue the depressurization mechanism as long as the pressure difference between the inner pressure hose 13 and the cylinder 14a or 14b occurs each time a differential pressure occurs. Therefore, the check valves 20a and 20b disposed in the intake port are required to have a small minimum operating pressure difference. The minimum operating pressure difference is determined by the spring constant of the compression coil spring 203 in the check valve as in the present embodiment.

These series of reciprocating operations can be detected by the acceleration sensor 181 and displayed on the display unit 183 as the number of times the handle 18 is stroked. In the early stages of using the vacuum pump, a large differential pressure is shown in the cylinders 14a and 14b, but as the piston reciprocates, the differential pressure decreases gradually. At this time, the shaft seals 21a and 21b are referred to as a double structure in order to ensure sufficient differential pressure between the negative pressure (less than 30torr) and the outside air (76Otorr) inside the cylinder 14 and to prevent air leakage. It consists. The double structure makes it possible to prevent foreign substances that are easily attached and engaged with the seal portion when the support shaft is operated. Further, the shaft seal 22 sufficiently secures the differential pressure state seen when the piston 16 reciprocates with one O-ring.

The specific installation procedure will be described. The internal pressure hose 11 of the vacuum pump is connected to the low pressure side port 12b of the gauge manifold 12 to the service port 8b. The internal pressure hose 11 has an indoor unit B and a connection pipe ( 9) It is in communication with the inside. The pressure hose 13 inside is in communication with the low pressure side handle 12c of the gauge manifold 12 in an open state. Next, since the operator reciprocates the handle 18 of the vacuum pump and reads the number of stroke movements from the display unit 183, the interior of the indoor unit B and the connecting pipe 9 is in a sufficient negative pressure state. It can be estimated by estimation. In addition, the sufficient negative pressure state is confirmed by the operator by the scale of the low pressure gauge 12d of the gauge manifold 12. Immediately thereafter, the low-pressure side handle 12c of the gauge manifold 12 is closed, and left for a while to confirm that there is no change in the scale of the storage gauge 12d. If there is a change in scale, there is a place where air leakage occurs in the connecting pipe. Then, the screw portion 7a of the liquid-side two-way valve 7 is slightly loosened, and the refrigerant gas on the outdoor unit A side is introduced, whereby the interior of the connection pipes 9 and 10 and the indoor unit B side piping are slightly static. (About 0.2 kgf / cm). After that, the pressure resistant hose 11 is removed from the service port 8b, and the threaded portion 7a of the reduction-way two-way valve 7 is rotated a quarter turn to further pressurize (about 3 to 6 kgf / cm 2). Recheck the leakage of the connecting pipe. Lastly, the screw portion 7a of the liquid side two-way valve 7 is completely opened, and the screw portion 8a of the gas side three-way valve 8 is also fully opened. The work is complete.

In this embodiment, the inner volume of the indoor unit B side piping and the connecting piping 9 and 10 including the indoor heat exchanger 6 is 1.5 liter. In the vacuum pump, the volume in the cylinder space when the piston is located at the top dead center is 150 ml (27 mm x 260 mm), and the intake port side and the exhaust port side check valve 2 are formed from the cylinder outlet formed when the piston is located at the bottom dead center. The volume in the total space to the dog was 1.5 ml. However, the port flow path space generated in the cylinder body bulkhead was also considered to be included here. The cylinder dead space formed when the piston was located at the bottom dead center was 2 ml. Volume in the cylinder space formed when the piston is located at the top dead center, dead space in the cylinder formed when the piston is located at the bottom dead center, and volume in the space from the cylinder outlet to the two check valves on the intake and exhaust ports Let Vla be the sum, and Vla and Vlb are the sum of the in-cylinder dead space formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the two inlet and exhaust port check valves. The relationship of Vla / Vlb = 44.

Fig. 10 specifically shows the volume in the total space from the cylinder outlet when the piston is located at the bottom dead center to two intake port side and two exhaust port side check valves, and the Vlb portion which becomes the dead space in the cylinder. The intake port and exhaust port are buried in the partition wall at the top dead center surface and the bottom dead center surface of the cylinder body, and two check valves are directly connected, respectively. Designed to be.

At this time, the operation was carried out in accordance with the above working procedure, and 30 torr was achieved by reciprocating the handle by 40 strokes using a vacuum pump. The decompression progress state at this time is shown in Fig. 11 in relation to the stroke frequency and the internal pressure. Although the decompression progress was confirmed up to 50 strokes, the attained vacuum reached equilibrium at 40 strokes and did not proceed further. Therefore, when the vacuum pump according to the present embodiment was applied to the one having an internal volume of 1.5 liters, it was found that 40 strokes became the target of the attained vacuum degree. The exact degree of vacuum was monitored using a separate digital pressure sensor.

Example 2

Fig. 12 shows a schematic diagram for explaining in detail the internal pressure hose connection path connecting the vacuum pump main body structure and the exhaust port side in this embodiment, and Fig. 13 shows a schematic diagram of the pressure resistance hose connection path connecting the intake port side. . In this embodiment as well, the vacuum pump main body was used in the same manner as in Example 1, but a pressure resistant hose 23 serving as a connection portion connecting one exhaust port was provided. In addition, about the structural member similar to Example 1, the detailed description is abbreviate | omitted.

Next, the effect will be explained in the operating mechanism of the vacuum pump. First, when the handle 18 is pulled in the a direction (top dead center side), the air inside the cylinder 14a is introduced into the indoor unit B and the connecting pipe 9 through the check valve 19a serving as the exhaust port. Next, when the handle 18 is pressed in the b direction (lower dead center side), the air inside the cylinder 14b is introduced into the indoor unit B and the connecting pipe 9 through the check valve 19b serving as the exhaust port. Next, the handle 18 is reciprocated so that the handle 18 is pulled in the a direction (top dead center side) again, and the piston 16 is synchronized. At this time, the four check valves are replaced in the cylinder, so that the piston may move in any of the a direction and the b direction to pressurize the indoor unit B and the connecting pipe 9 constantly from the atmosphere. It could be used as a pump. In order to carry out these operations by human power, the pressurization level has a limit by itself, and it was a level which can be easily achieved by anyone up to about 5 kg / cm 2.

The specific installation procedure will be described. After connecting the indoor unit (B) to the outdoor unit (A) with a connecting pipe, the service port portion (8b) is connected to the exhaust port side pressure hose (23) of the vacuum pump to the low pressure side port (12b) of the gauge manifold (12). ), The pressure resistant hose (11) inside is in communication with the indoor unit (B) and the connecting pipe (9). In addition, the inside of the pressure resistant hose 13 is in a communication state by opening the low pressure side handle 12c of the gauge manifold 12 in an open state. Next, the handle 18 of the vacuum pump is reciprocated, and the low pressure side handle 12c is closed at a time when it is difficult for an operator to operate by manpower, so that the inside of the indoor unit B and the connection pipe 9 are weak. It is pressurized in the atmosphere of about 5kg / cm 2. While checking this pressure level value with the low pressure gauge 12d, it was possible to perform the leak test accompanying the connection piping work by waiting for a while. After that, the pressure hose 23 is lowered from the low pressure side port 12b of the gauge manifold 12 to release the low pressure side handle 12c to release the pressurized air to the outside, and returns to the normal pressure state. Next, the internal pressure hose 13 of the vacuum pump is connected to the low pressure side port 12b of the gauge manifold 12. At this time, since the low pressure side handle 12c of the gauge manifold 12 remains open, it is in communication with the indoor unit B and the inside of the connection pipe 9. When the handle 18 of the vacuum pump is reciprocated, the pressure can be gradually reduced, and since the operator reads the number of stroke movements from the display unit 183, the inside of the indoor unit B and the connection pipe 9 have a sufficient negative pressure state. It was estimated that it became. In addition, the sufficient negative pressure state is confirmed by the operator by the scale of the low pressure gauge 12d of the gauge manifold 12. Immediately thereafter, the low pressure side handle 12c of the gauge manifold 12 is brought into the closed state. Then, by unscrewing the threaded portion 7a of the reduction-side two-way valve 7 and introducing the refrigerant gas on the outdoor unit A side, the inside of the connecting pipes 9 and 10 and the indoor unit B side piping are slightly static pressure state. (About 0.2 kgf / cm). Thereafter, the pressure resistant hose 11 is removed from the service port 8b, and the screw portion 7a of the liquid-side two-way valve 7 is completely opened. Finally, the threaded portion 8a of the gas-side three-way valve 8 is also fully opened, and the installation work on the construction of the air conditioner is completed.

In this embodiment, the inner volume of the indoor unit B side piping and the connecting piping 9 and 10 including the indoor heat exchanger 6 is 1.5 liter. In the vacuum pump, the volume in the cylinder space when the piston is located at the top dead center is 250 ml (27 mm x 440 mm), and the intake port side and the exhaust port side check valve 2 are formed from the cylinder outlet formed when the piston is located at the bottom dead center. The volume in the total space to the dog was 1.5 ml. However, the port flow path space generated in the cylinder body bulkhead was also included here. The cylinder dead space formed when the piston was located at the bottom dead center was 2 ml. Similarly to Example 1, the relationship between Vla and Vlb is found to be Vla / Vlb = 72.

At this time, 18 torr could be achieved by reciprocating the handle by 40 strokes using a vacuum pump according to the above working procedure. The decompression progress state at this time is shown in FIG. 14 in relation to the stroke frequency and the internal pressure. At 25 strokes or less, 30 torr was confirmed, and the decompression progress was confirmed up to 50 strokes, but the attained vacuum degree reached the equilibrium state of 40 strokes and did not proceed further. Accordingly, it was found that even when the vacuum pump according to the present embodiment was applied to a 1.5 liter inner volume, 40 strokes became the target of the attained vacuum degree. The exact degree of vacuum was monitored using a separate digital pressure sensor.

In this embodiment, by using the exhaust port side of the vacuum pump and using the pump for pressurization, the leak inspection accompanying the installation work can be sufficiently performed. In the related art, leak inspection for connection pipes and indoor units had no choice but to use a refrigerant, but leak inspection using the pressurized air provided a more preferable method for constructing an air conditioner.

Example 3

In this embodiment, omitting the gauge manifold 12 in the path from the service port to the vacuum pump is omitted. Fig. 15 shows a schematic diagram for explaining in detail the internal pressure hose connection path connecting the vacuum pump main body structure and the exhaust port side in this embodiment, and Fig. 16 shows a schematic diagram of the pressure resistance hose connection path connecting the intake port side. . The structure of the vacuum pump is arranged so that an aluminum piston 27 divides the inside of the cylinder into two chambers inside the cylinder body 15 made of aluminum, and the piston 27 is made of an aluminum handle 18 through a stainless support shaft 17. ) As in the first embodiment, an acceleration sensor is incorporated in the handle 18, and a signal from the acceleration sensor is displayed on the display unit. In this embodiment, when the piston 27 operates inside the cylinder 15, the check valves 30a, 30b, 31a, and 31b are directly connected to the cylinder body side bulkheads corresponding to the top dead center and bottom dead center surfaces of the piston 27. It was set as the structure. The same specifications as in Example 1 were used for the check valves 30a and 30b for the exhaust port and the check valves 31a and 31b for the intake port. In addition, the same shaft seal as in Example 1 was also provided at the portion where the support shaft 17 was in contact with the cylinder partition wall, and the shaft seal 22 was also provided at the portion where the piston 27 was in contact with the inner wall of the cylinder 15. 17 and 18 show the internal structure of the filter unit 14 and the flow of air. The main body of the filter part 14 has a cylindrical shape, and when the filter part 14 is used on the intake port side, that is, FIG. 17, the air which entered into the outer circumferential flow path 252 immediately hits the wall 251. The flow changes, and enters the internal path 254 through the cylindrical pulp film 253 fixedly disposed therein, and finally introduced to the outside. In addition, when it is used on the exhaust port side, that is, FIG. 18, the air from the inner flow passage 254 to the outside of the cylindrical pulp membrane 253 is provided with a cylindrical pulp nonwoven fabric provided on the inner wall surface of the cylindrical body of the filter portion 14 ( While colliding with 255, it passes through the outer circumferential path 252 and is discharged to the outside. Therefore, when used on the intake port side, the waste is collected in a cylindrical pulp film 253 having a relatively small snow, and when used on the exhaust port side, the waste is collected by a cylindrical pulp nonwoven fabric 255 having a large snow. .

The same structure as the first embodiment shown in Figs. 5 and 6 is used for the exhaust port check valves 30a and 30b, and the intake port check valves 31a and 31b are the same as the first embodiment shown in Fig. 7. The structure of was used.

The one-touch pipe joints 34a and 34b are provided in the exhaust port check valves 30a and 30b via the joint portions 33a and 33b, respectively. In addition, one-touch pipe joints 36a and 36b are provided in the intake port check valves 31a and 31b through the joints 35a and 35b, respectively. The structures of the one-touch pipe joints 34a, 34b, 36a, and 36b are almost the same, and the configuration outline is shown in FIG. 19, with the one-touch pipe joint 34a as a representative. A concrete structure is demonstrated below. The release push 341 is disposed along the pressure resistant hose, and the release push 341 is fixed by installing the guide 343 and the collet 344 on the main body 342. The chuck 345 is disposed between the release bush 341 and the collet 344, and the chuck 345 is pressed against the pressure-resistant hose by the lip seal 346 made of CR rubber so that the chuck 345 is applied to the pressure-resistant hose. It meshes in and prevents the pressure hose from falling out. In addition, when the release push 341 enters the inner side along the pressure hose, the pressure of the chuck 345 can be released, so that the pressure hose can be easily removed. If the lip seal 346 is sufficiently functioning, air leakage can be prevented.

Specific installation procedure will be described. After the indoor unit B is connected to the outdoor unit A with a connection pipe, the pressure resistant hose 13 serving as a connection port for connecting two exhaust ports to the exhaust port side of the vacuum pump is connected. Specifically, the pressure resistant hose branched through the filter 14 is connected to the one-touch pipe joints 34a and 34b, respectively. The pressure resistant hose 13 is also connected to the service port section 8b. Next, when the handle 18 of the vacuum pump is reciprocated and stopped at a time when it is difficult for an operator to operate by manpower, the indoor unit B and the connecting pipe 9 are about 5 kg / cmt in a pressurized state from the atmosphere. It can be estimated. This judgment is made easy enough to experience the construction work several times. After that, the leak test accompanying the connection pipe work could be performed using soapy water or the like. After the leak test, the one-touch pipe joints 34a and 34b are removed to return the indoor unit B and the connection pipe 9 to the atmospheric pressure again. Next, each of the branch portions of the pressure resistant hose 13 is connected to the one-touch joints 36a and 36b. When the handle 18 of the vacuum pump is reciprocated, the pressure can be gradually reduced, and the operator reads the number of stroke movements on the display unit, indicating that the interior of the indoor unit B and the connection pipe 9 are in a sufficient negative pressure state. It could be estimated by estimation. In other words, if the operator knows in advance the relationship between the length of the connection pipe 9 and the stroke frequency of the vacuum pump from experience and base data, only the stroke number is confirmed by the acceleration sensor, so that the interior of the indoor unit B and the connection pipe 9 are The sufficient negative pressure state can be estimated by estimation.

Thereafter, by unscrewing the screw portion 7a of the liquid-side two-way valve 7 and introducing the refrigerant gas on the outdoor unit A side, the inside of the connecting pipes 9 and 10 and the indoor unit B side piping are slightly static pressure state ( About 0.2kgf / cm). Thereafter, the pressure resistant hose 13 is removed from the service port 8b, and the screw portion 7a of the liquid-side two-way valve 7 is completely opened. Finally, the threaded portion 8a of the gas-side three-way valve 8 is also fully opened to complete the installation work on the construction of the air conditioner.

In the present embodiment, the inner volume of the indoor unit B side piping including the indoor heat exchanger 6 and the connecting pipes 9 and 10 are 2.5 liters. In the vacuum pump, the volume in the cylinder space when the piston is located at the top dead center is 250 ml (27 mm x 440 mm), and the intake port side and the exhaust port side check valve 2 are formed from the cylinder outlet formed when the piston is located at the bottom dead center. The volume in the total space to the dog was 1.5 ml. However, the flow path space for ports generated in the main body bulkhead inside the cylinder was also considered to be included here. The cylinder dead space formed when the piston was located at the bottom dead center was 3 ml. Similarly to Example 1, the relationship between Vla and Vlb is found to be Vla / Vlb = 57. Fig. 20 specifically shows the volume in the total space from the cylinder outlet when the piston is located at the bottom dead center to the two intake port side and the exhaust port side check valves and the Vlb portion which becomes the dead space in the cylinder. The intake port and exhaust port are embedded in the side bulkheads corresponding to the top dead center surface and the bottom dead center surface of the cylinder body in the state where two check valves are directly connected to each other so that the dead space in the pressure reducing mechanism is minimized. In addition, by installing the check valve on the side partition wall, the piston reciprocating movement is possible with the bottom surface of the cylinder 15 of the vacuum pump placed on the ground or the like. As a result, the operator's operability with respect to the vacuum pump was improved.

At this time, 22torr was achieved by reciprocating the 70 strokes of the handle using a vacuum pump according to the above working sequence. The decompression progress state at this time is shown in FIG. 21 in relation to the stroke frequency and the internal pressure. At 30 strokes or less at 60 strokes and the decompression progress was confirmed up to 80 strokes, the attained vacuum reached equilibrium at 70 strokes and did not proceed further. Therefore, even when it applied to what was 2.5 liters internal volume by the vacuum pump which concerns on a present Example, it turned out that 70 stroke becomes a target of reached vacuum degree. The exact degree of vacuum was monitored using a separate digital pressure sensor.

In this embodiment, by using the exhaust port side of the vacuum pump having a connection device that can be easily detached and used as a pressurizing pump for the first time, the leak inspection accompanying the installation work can be sufficiently performed. Next, by attaching the pressure resistant hose to the intake port side, it could be used as an original vacuum pump for pressure reduction. In this way, by attaching only the pressure resistant hose portion that becomes the connection portion of each exhaust port or the intake port to the exhaust port side or the intake port side, it becomes possible to use the function of the vacuum pump separately. In addition, since the required pressure resistant hose was finished with one, it could be provided as a compact one compared with Example 2.

In this embodiment, the one-touch pipe joint having the one shown in Fig. 19 is used as the easily detachable connection device. However, the simply detachable connection device applicable to the present invention is not limited to this. In addition, a tube coupler without a self-sealing mechanism may be used.

When the refrigerant is R410A, the refrigeration oil is completed in the order of Examples 1, 2, and 3 for the ester-based air conditioner, the discharge temperature of the compressor is set to an overload condition of 115 ° C, and the indoor unit, All outdoor units were 40 degreeC, and the reliability test was done for 5000 hours. As a result, no abnormality occurred in particular.

In the decompression mechanism of the vacuum pump according to the present invention, the inside of the cylinder can be always depressurized by operating the piston, but the intake port side and exhaust from the cylinder dead space and the cylinder outlet formed when the piston is located at the bottom dead center. The space volume up to two port side check valves becomes dead space. The dead space inside the cylinder is a slight gap formed when the piston and the bottom dead center of the cylinder contact each other, and a path for the intake port and the exhaust port formed in the cylinder partition wall. However, for the attained vacuum degree, the sum Vla of the volume in the cylinder space and the volume in the space from the cylinder dead space and cylinder outlet formed when the piston is located at the bottom dead center and two intake port side and two exhaust port side check valves, The relationship between the dead space in the cylinder formed when the piston is located at the bottom dead center and the volume Vlb in the space from the cylinder outlet to the two intake port side and exhaust port side check valves becomes important. In addition, a vacuum pump at the piston top dead center side if the space in the cylinder dead space formed when the piston is positioned at the top dead center and the space volume from the cylinder outlet to the two intake port side and the exhaust port side check valves is much larger than the dead space described above. It is preferable that the dead spaces formed on the top dead center side and the bottom dead center side be nearly equal, so that the dead spaces formed on the top dead center side of the piston are also important factors of the attained vacuum degree. This is because the cylinder space volume is narrowed by the volume fraction occupied by the support shaft.

The volume in the cylinder space formed when the piston is located at the top dead center and the dead space in the cylinder formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the two check valves on the intake port side and the exhaust port side The relationship between the total dead volume Vlb from the cylinder dead space and the cylinder outlet from the outlet of the cylinder and the inlet and exhaust port side check valves formed when Vla and the piston are located at the bottom dead center is Vla / Vlb≥40. When the amount of leakage from the check valve is suppressed to some extent, it was found that 30 torr or less can be sufficiently achieved by reciprocating the handle of the vacuum pump. Based on the long-term reliability of the refrigeration cycle, Vla / Vlb≥40 is required even if there is no leak in the design. The relationship between Vla / Vlb is too large and does not interfere with the attained vacuum degree, but the vacuum pump swells or becomes heavy, resulting in poor portability. It also worsens the workability to reciprocate the handle.

It was found that the number of strokes of the vacuum pump required for the construction of the air conditioner in the present invention is determined by the relationship between the volume of the indoor unit side pipe and the connecting pipe and the volume in the cylinder space. If the indoor unit piping and connecting piping have a volume of 1.5 liters, the parallel volume is reached by reciprocating about 40 strokes at a volume of 150 or 250 ml in the cylinder space, and the contents of the indoor piping and connecting piping are 2.5 liters. Parallelism was reached with a volume in the cylinder space of about 70 stroke reciprocating at 250 ml. Therefore, the operator can estimate and determine the approximate attained vacuum degree by managing only the stroke count of the vacuum pump by making these relationships into a database.

A shaft seal which can be used in the present invention is an elastomer having a hardness of about 60 to 90 in a spring type A form. Specifically, CR, EPDM, NBR, etc. may be applied in addition to HNBR. In addition, in the embodiment, the shaft seal has an O-ring double structure, and the point of contact with the support shaft is two points. At this time, the outer contact point removes dust attached to the support shaft when the support shaft is outside the cylinder. Doing. In addition, by making two or more points of contact with the sudden movement of the support shaft, even if one side showed air leakage, it was possible to shield at the other point of contact.

As the check valve configuration on the exhaust port side that can be used in the present invention, an open / close valve structure may be constituted by moving an animal made of a light and small metal sphere in the pipe, as in the embodiment. In addition to nylons, fluorine-based resins such as PFA and PVDF, and PPS can also be used. In the check valve used in the present invention, the minimum operating pressure difference is important even on the intake port side and the exhaust port side. That is, the exhaust port side is a direction in which the tension difference gradually increases when the vacuum pump is operated, whereas the pressure difference in the indoor unit, the connection pipe, and the cylinder decreases on the intake port side. Therefore, it is preferable that the check valve on the intake port side can close the valve even at a small differential pressure, and specifically, the minimum operating pressure difference is 10 or less. In addition, it is preferable that the gas leakage amount is 1 ml / min or less in the state of 1 kgf / cm <2> of a differential pressure. This is because, as soon as the operator stops the handle operation of the vacuum pump, the workability deteriorates in such a case that the reached vacuum degree so far drops sharply. Specifically, a check valve for closing the flow path was preferable in pressing the resin film onto the accommodating sheet body by the compression coil spring used in the examples. The spring constant of the compression coil spring at that time was 0.01 to 0.04 N / mm. When the spring constant is 0.0lN / mm or less, the compression coil spring may be affected by gravity due to the direction of the vacuum pump when the work is performed, and thus may not function sufficiently.

In the embodiment, the vacuum pump is operated using a manual handle. However, a mechanism may be provided in which a pedal is provided to synchronize the operation of the piston with the pedal. Considering the global environment, a sufficient degree of vacuum can be obtained by a manpower using a handle or a pedal with respect to a conventional electric motor, which greatly reduces the environmental load in the construction of an air conditioner.

Example 4

The refrigeration cycle structure which points out the air conditioner in Example 4 is the same as that of FIG. 1 which is the structure of the refrigeration cycle of Example 1. FIG.

In the separate type air conditioner of this embodiment, the refrigerant gas of the amount required to connect both the outdoor unit (A) and the indoor unit (B) in a ring shape at the connecting pipes (9, 10) to achieve a predetermined cooling and heating capability is previously stored in the outdoor unit ( The inside of the pipe of A) is filled, and the threaded portion 7a of the reduction-side two-way valve 7 and the threaded portion 8a of the gas-side three-way valve 8 are closed. After the construction in which the indoor unit B is connected to the outdoor unit A by the connecting pipes 9 and 10, the indoor unit B and the inside of the connecting pipes 9 and 10 are removed in consideration of the reliability of the refrigeration cycle. The vacuum pump P of the present invention shown in Fig. 16 is also used to carry out a vacuum pulling to reduce oxygen in the air to a sufficient level.

That is, the connecting pipes 9 and 10 connected to the indoor unit B are connected to the liquid side two-way valve 7 and the gas side three-way valve 8 of the outdoor unit A, and then the gas of the outdoor unit A is The vacuum pump P is connected to the service port part 8b of the side three-way valve 8 by the pressure-resistant hose 13 which becomes a connection port part which connects two intake ports 31 to one. The pressure resistant hose 13 is provided with a filter portion 14 in its path.

Fig. 16 is a schematic diagram illustrating in detail the configuration of the vacuum pump P and the connection path of the pressure resistant hose of the present invention. By operating the handle 18 up or down, the intake port 31 side is in a negative pressure state while the differential pressure of the two chambers is gradually attenuated from the initial stage even in either of the a and b directions.

3, FIG. 3 as a sensor for counting (detecting) strokes in the a-direction and the b-direction of the piston 27 so that the negative pressure state on the intake port 31 side can be estimated inside the handle 18. FIG. The acceleration sensor 181 shown in FIG. 4 and the primary battery 182 are incorporated. The display unit 183 is disposed on the upper surface of the handle 18, and the display unit 183 displays the negative pressure state on the intake port 31 side based on the detection signal from the acceleration sensor 181. It is supposed to be. In addition, the intake port 31 and the exhaust port 30 are provided at positions facing the top dead center position and the bottom dead center position of the two chambers 26a and 26b of the cylinder 15, respectively, and the vacuum pump P Total weight is approximately 1 kg.

FIG. 3 is a schematic view showing the main parts of the handle 18, and FIG. 4 is a schematic diagram of the acceleration sensor 181. As shown in FIG. The acceleration sensor 181 is comprised from the sensor part 41 made thin in the silicon semiconductor 40, and the large weight part 42 of an area. And the operation of the acceleration sensor 181 collides with the wall of the cylinder 15, and the stroke of the handle 18 when the piston 27 reaches the top dead center position or the bottom dead center position of the cylinder 15 manually. When the movement stops and the acceleration G due to the collision occurs at that time, the weight portion 42 detects it and the sensor portion 41 is deformed.

The electrical resistance of the diffusion layer 43 formed on the sensor part 41 is changed by the deformation. That is, the acceleration sensor 181 detects the stress accompanying the deformation of the sensor portion 41 due to the acceleration G by the viese (piezoelectric) effect of the sensor portion 41, and detects the voltage through the bridge circuit. It is configured to convert to an output and count one stroke when it exceeds a certain level. In the meantime, 44 is an electrode, and 45 is a case including a bottom plate for fixing the electrode 44.

FIG. 22 is a flowchart until the acceleration sensor 181 counts the reciprocating motion of the piston 27 to estimate and display the negative pressure state on the intake port 31 side. A / D for amplifying the signal output by the piezo effect from the sensor unit 41 in the amplifying unit 50, excluding unnecessary components from the output component with the filter unit 51, and then converting the output into a digital signal. After calculating the negative pressure state on the intake port 31 side by the calculation unit 53 through the conversion unit 52, the display unit 183 finally displays the count.

Next, the operation of the vacuum pump P will be described. First, when the handle 18 is pulled in the a direction (top dead center side), the air inside the connection pipe 9, the indoor unit B, and the connection pipe 10 is discharged from the service port portion 8b to the pressure resistant hose 13, The air is sucked into the chamber 26a inside the cylinder 15 through the intake check valve 31b of the intake port 31 via the filter unit 14, and the air of the chamber 26a inside the cylinder 15 is reversed. It is discharged to the atmosphere through the exhaust check valve 30a of the exhaust port 30.

Next, when the handle 18 is pressed in the b direction (lower dead center side), the air inside the connecting pipe 9, the indoor unit, and the connecting pipe 10 is discharged from the service port part 8b to the pressure resistant hose 13 and the filter part ( 14 is sucked into the chamber 26b inside the cylinder 15 through the intake check valve 31a of the intake port 31, and on the contrary, the air of the chamber 26a inside the cylinder 15 is exhaust port 30. Is discharged to the atmosphere through the exhaust check valve (30b).

Next, the reciprocating motion of the handle 18 is repeated so that the handle 18 is pulled in the a direction (top dead center side) again, and the piston 17 is synchronized. At this time, while the four check valves are replaced in the cylinder 15, the piston is constantly depressurized even if the piston moves in either the a or b direction, and finally a sufficient negative pressure state can be achieved. Strictly, when the handle 18 reciprocates, it is possible to continue the depressurization mechanism as long as the seal 26a or 26b inside the pressure hose 13 and the cylinder inside can generate a differential pressure. Therefore, the intake check valves 31a and 31b disposed in the intake port 31 are required to have a small minimum operating pressure difference. The minimum operating pressure difference is determined by the spring constant of the compression coil spring 203 in the intake check valve as in the present embodiment.

In carrying out these series of reciprocating operations of the vacuum pump P, the operator makes the piston 27 collide with the inner wall of the cylinder 15 at the top dead center position and the bottom dead center position, respectively. Can generate acceleration. The acceleration G is transmitted to the handle 18 through the support shaft 17. As a result, the acceleration sensor 181 can detect the generated acceleration G and display it as the number of times which the display part 183 strokes.

Although the vacuum pump P shows a large differential pressure in the seals 26a and 26b inside the cylinder 15 at the beginning of use, the differential pressure decreases gradually as the piston 27 reciprocates. At this time, the shaft seals 21a and 21b have an O-ring in a double structure in order to ensure sufficient differential pressure between the negative pressure (less than 30torr) and the outside air (760torr) in the cylinder 15 and to prevent air leakage. It consists. Thus, when the support shaft 17 is operated by a double structure, the foreign material which is easy to attach and engage with a seal | sticker part can also be prevented. Further, the shaft seal 22 sufficiently secures a differential pressure state generated when the piston 27 reciprocates with one O-ring.

The installation procedure of the air conditioner will be described. The connecting pipes 9 and 10 connected to the indoor unit B are connected to the liquid side two-way valve 7 and the gas-side three-way valve 8 of the outdoor unit A, and then the gas side 3 of the outdoor unit A. The vacuum pump P is connected to the service port 8b of the room valve 8 with a pressure resistant hose 13. The vacuum pump P attaches the pressure resistant hose 13 to the service port 8b so that the interior of the pressure resistant hose 13 is in communication with the indoor unit B and the connection pipes 9 and 10. .

Next, since the operator reciprocates the handle 18 of the vacuum pump P and the number of stroke movements is read by the display unit 183, the interior of the indoor unit B and the connection pipes 9, 10 is sufficient. It can be estimated that the negative pressure has been reached. Then, by loosening the screw portion 7a of the liquid-side two-way valve 7 and introducing the refrigerant gas filled in the outdoor unit side, the inside of the connecting pipes 9 and 10 and the indoor unit side piping are slightly static pressure (about 0.2 kgf). / Cm 2). Thereafter, the pressure resistant hose 13 is removed from the service port 8b, and the service port 8b is automatically closed. Then, the screw portion 7a of the liquid-side two-way valve 7 is again rotated for 1/4, and the pressure of the connecting pipe portion is rechecked in a pressurized state (about 3 to 6 kgf / cml). Lastly, the threaded portion 7a of the reducing side two-way valve 7 is completely opened, and the screwed portion 8a of the gas-side three-way valve 8 is also fully opened. The installation is complete.

In the present embodiment, the interior volume of the indoor unit side pipes and the connection pipes 9 and 10 including the indoor heat exchanger 6 is 2.5 liters. In the vacuum pump, the intake port from the cylinder outlet as the exhaust port 30 formed when the piston 27 is located at the top dead center has a volume in the cylinder space of 250 ml (27φ × 440 mm) and the piston is located at the bottom dead center. The volume in the total space of up to two check valves on the side and the exhaust port side was set to 1.5 ml. However, it was considered that the flow path space for a port which arises in the main body partition of the cylinder 15 is also included here.

The cylinder dead space formed when the piston 27 was located at the bottom dead center was 3 ml. Volume in the cylinder space formed when the piston 27 is located at the top dead center, dead space inside the cylinder formed when the piston is located at the bottom dead center, and space from the cylinder outlet to two check valves on the intake port and exhaust port side When the volume in the total space of the volume is called Vla, the dead space in the cylinder formed when the piston is located at the bottom dead center, and the volume in the total space from the cylinder outlet to the two check valves on the intake port and exhaust port are Vlb. , The relationship between Vla and Vlb is Vla / Vlb = 57.

Fig. 20 specifically shows the volume in the total space from the cylinder outlet when the piston 27 is located at the bottom dead center to the two intake port side and the exhaust port side check valves, and the Vlb portion which becomes the dead space in the cylinder. . The intake port 31 and the exhaust port 30 are connected to the top dead center position and the bottom dead center position of the cylinder 27, and two exhaust check valves 30a and 30b and two intake check valves 31a and 31b are respectively connected directly. In order to minimize the dead space in the pressure reducing mechanism in the system structure, the bottom surface of the cylinder 15 of the vacuum pump P is grounded. The piston 27 can be reciprocated in a state directly placed on the back. As a result, the operator's operability with respect to the vacuum pump can be improved, and the handling can be carried out normally without any particular concern in handling.

The vacuum pump P was able to achieve up to 22 torr by carrying out work according to the above procedure and reciprocating the handle 18 by 70 strokes. 21 shows the relationship between the number of strokes on the horizontal axis and the internal pressure on the vertical axis. Although the decompression progress was confirmed up to 80 strokes, the attained vacuum reached equilibrium with 70 strokes and no further progress was made. Therefore, when it applied to what was 2.5 liters of internal volume by the vacuum pump P which concerns on a present Example, it turned out that 70 stroke becomes a target of reached vacuum degree.

The exact vacuum level was monitored using a separate digital pressure sensor. The stroke count can be counted by the operator in the head, but it is very convenient for the operation if the stroke count can be reliably displayed using the acceleration sensor as in the present embodiment. For example, the operator can speak the stroke during counting to prevent erroneous counting.

In addition, although the acceleration sensor 181 was provided in the inside of the handle 18 in this embodiment, it is not limited to this. That is, since the piston 27 colliding with the cylinder 15 is fixed to the support shaft 17, and the support shaft 17 is fixed to the handle 18, the piston 27 is installed on any one of the piston, the support shaft, or the handle. If so, the initial goal can be achieved.

Example 5

Fig. 23 is a schematic configuration diagram showing an acceleration sensor provided on the handle of the vacuum pump in the fifth embodiment of the present invention. In this embodiment, a strain resistance type is used as the acceleration sensor system, and the other vacuum pump is the same as that of the fourth embodiment, so detailed description is omitted and only other parts will be described.

The support 132 is provided in the case 131, and the support 132 is comprised so that the weight 133 arrange | positioned at the front-end | tip can be supported by the arm 134 in letter shape. On the surface of the arm 134, a part serving as the strain gauge 135 is bonded to two front and back. 24 is a diagram illustrating a configuration of the strain gauge 135. The metal foil 152 of 3 micrometers in thickness was adhere | attached on the polyimide insulating film 151, and it patterned so that it may become a predetermined shape and resistance value by hot etching, and it covered it with the protective film. It is a lead wire.

Fig. 25 is a detection circuit diagram of a strain gauge of an acceleration sensor in the vacuum pump of the present invention. When the change in resistance when the load (acceleration G) is applied to the free end of the cantilever type support arm 134 is ΔR, the voltages at points a and b of the bridge circuit are Va and Vb, and the output voltage If Vo, each voltage is expressed by the following equation. The signal output is then amplified and signal processed, and counted and displayed on the display unit in the same manner as in the fourth embodiment.

Va = V-R1 / (R1 + RG1 + ΔR)

Vb = V-R2 / (R2 + RG2 + ΔR)

Vo = 1Va-Vb1

In the present embodiment, the interior volume of the indoor unit side pipes and the connection pipes 9 and 10 including the indoor heat exchanger 6 is 1.5 liters. In the vacuum pump, the volume in the cylinder space when the piston 27 is located at the top dead center is 200 ml (27 mm x 350 mm), and the intake port side and exhaust port side checks are formed from the cylinder outlet formed when the piston is located at the bottom dead center. The volume in the total space up to two valves is 1.5 ml, and the dead space in the cylinder formed when the piston is located at the bottom dead center is 3 ml. However, the flow path space for the port formed in the main body partition wall of the cylinder 13 was also considered to be included here. When the relationship between the volume Vla in the total space and the volume Vlb in the total space is obtained, Vla / Vlb = 45 as in the fourth embodiment.

In the above embodiment, the construction operation of the air conditioner was carried out, and the handle of the vacuum pump P was reached to 28 torr by reciprocating the 40 strokes. The relationship between the stroke frequency and the internal pressure is shown in FIG. 26 for the decompression progress state at this time. The decompression progress was confirmed up to 50 strokes, and the attained vacuum reached equilibrium at 40 strokes and no further progress was made. Therefore, when the vacuum pump according to the present embodiment was applied to the one having an internal volume of 1.5 liters, it was found that 40 strokes became the target of the attained vacuum degree. The exact degree of vacuum was monitored using a separate digital pressure sensor.

In the present embodiment, an electronic strain resistance type is used as the acceleration sensor. However, the piezoelectric element type or the capacitance type may be used.

Example 6

Fig. 27 is a schematic diagram in which a counter with an acceleration sensor is provided on the handle of the vacuum pump of the present invention, and Fig. 28 is a schematic diagram for explaining a method of the acceleration sensor. The present embodiment also uses a mechanical type as the acceleration sensor system, and the other vacuum pump has the same configuration as that of the fourth embodiment, so detailed description is omitted and only other portions will be described.

The counter 210 incorporating the acceleration sensor is configured to be detachably attached to the handle 18 of the vacuum pump by the magic tape 220. As for the counter 210, as shown in FIG. 28, the pendulum 212 can move up and down centering on the point 211. As shown in FIG. A magnet 213 is provided at the tip of the pendulum 212. In addition, the vertical movement of the pendulum 212 can be controlled by the spring force of the sun spring 214.

One side of the line spring 214 is fixed to the main body and the fixing part 215 of the counter 210, and the other is fixed to the pendulum 212 and the fixing part 216. Further, the reed switch 217 is provided at a position facing the magnet 213 when the pendulum 212 reaches the lowest position. The counter 210 is arranged with a primary battery as the other display unit and power supply unit. The reed switch 217 encloses a pair of lead pieces composed of a magnetic material in a glass tube together with an inert gas, and repeats the ON-OFF operation by the action of an external magnetic field.

In the above embodiment, when the piston of the vacuum pump strokes downward and reaches the bottom dead center and collides with the inner wall of the cylinder, the pendulum 212 also reaches the bottommost position once, and then the magnet 213 The reed switch 217 becomes an ON circuit and can be counted. In addition, when the piston strokes upward and reaches the top dead center and collides with the inner wall of the cylinder, the pendulum 212 also reaches the bottom position once, and the reed switch 217 is turned on by the magnet 213. It becomes countable. With respect to the impact acceleration G accompanying the stroke movement of the piston, by optimizing the line diameter and line length of the sun spring 214, it was possible to prevent a double count or a non-count state.

Example 7

Fig. 29 is a schematic view showing the method of the acceleration sensor of the vacuum pump in the seventh embodiment of the present invention, and Fig. 30 is a schematic view for explaining the method of the acceleration sensor. This embodiment also uses a mechanical one as the acceleration sensor system, and the other vacuum pump is the same as that of the fourth embodiment, so the detailed description is omitted and only other parts will be described.

In the present embodiment, as in the fifth embodiment, the counter 230 having the acceleration sensor is incorporated into the handle 18 of the vacuum pump so as to be detachable by the magic tape 240. The counter 230 is provided so that the arm 232 can move up and down so that the internal mechanism can rotate about the rotating shaft 231 as shown in FIG. The sun spring 233 is fixed to the main body and the fixing portion 234 of the counter 230 so that the arm 232 swings upward, and the other side is the arm 232 and the fixing portion 2321. ) Is fixed.

The contact upper switch 235 and the contact lower switch 236 are provided as contact pressing type for turning on the electric circuit when the arm 232 reaches the lower position. As for the contact upper switch 235, the lead wire is taken out from the terminal part 2351, and the edge part is bent at substantially right angle. Moreover, the lead wire is taken out from the terminal part 2361 for the contact lower switch 236. The upper stopper 237 and the lower stopper 238 are provided to control the position of the arm 232 in the upward direction. In addition, the counter 230 includes a primary battery as the display unit and the power supply unit.

In the above embodiment, when the piston of the vacuum pump strokes downward to reach the bottom dead center and collides with the inner wall of the cylinder, the arm 232 also reaches the lower position once, and then the upper contact switch 235 is opened. By conducting to the contact lower switch 236, it becomes an ON circuit and can be counted. In addition, when the piston strokes upward and reaches the top dead center and collides with the inner wall of the cylinder, the arm 232 also reaches the lower position once, and at that time, the upper contact switch 235 is connected to the lower contact switch 236. By conduction, it becomes an ON circuit and can be counted. With respect to the impact acceleration G accompanying the stroke movement of the piston, by optimizing the line diameter and line length of the sun spring 233, it was possible to prevent the double count or the non-count state.

Example 8

FIG. 31 is a schematic diagram showing the manner of the acceleration sensor of the vacuum pump in the eighth embodiment of the present invention, and FIG. 32 is a schematic diagram for explaining the manner of the acceleration sensor. The present embodiment also uses a mechanical type as the acceleration sensor system, and the other vacuum pump has the same configuration as that of the fourth embodiment, so detailed description is omitted and only other portions will be described.

In the present embodiment, as in the fifth embodiment, the counter 250 having the acceleration sensor is mounted on the portion of the handle 18 of the vacuum pump so as to be detachable by the magic tape 260. The counter 250 is provided so that the arm 252 can move up and down so that the internal mechanism can be rotated centering on the rotating shaft 251, as shown in FIG. 2521) is installed.

The sun spring 253 is fixed to the main body and the fixing portion 254 of the counter 250 so that the arm 252 swings upward, and the other side is the arm 252 and the fixing portion ( 2522). When the arm 252 has reached the lower position, the contact right switch 255 and the contact left switch 256 as contact conduction type for turning on the electrical circuit through the circular metal part 2521 are provided at the tip of the arm. The upper stopper 257 and the lower stopper 258 are provided to control the position of the arm 252 provided in the upward direction in order to regulate the position in the downward direction. In addition, the counter 250 has a primary battery disposed as a display unit and a power supply unit.

In the above embodiment, when the piston of the vacuum pump strokes downward and reaches the bottom dead center and collides with the inner wall of the cylinder, the arm 252 also reaches the lower position once, and at that time, the contact right switch 255 ) And the contact left switch 256 are brought into an ON state through the circular metal part 2521, and become an ON circuit so that they can be counted. In addition, when the piston strokes upward and reaches the top dead center and collides with the inner wall of the cylinder, the arm 252 also reaches the lower position once, and at this time, the contact right switch 255 and the contact left switch 256 The state becomes an ON circuit through the circular metal part 2521, so that the circuit can be counted as an ON circuit. With respect to the impact acceleration G accompanying the stroke movement of the piston, by optimizing the line diameter and line length of the sun spring 253, it was possible to prevent the double count or the non-count state.

On the other hand, the refrigerant is R410A, the refrigeration oil is completed in the order based on the above embodiment for the ester-based air conditioner, the discharge temperature of the compressor is set to an overload condition of 115 ℃, indoor unit, All outdoor units were 40 degreeC, and the reliability test was done for 5000 hours. As a result, no abnormality occurred in particular.

In the decompression mechanism of the vacuum pump P according to the present invention, the inside of the cylinder 15 can be normally decompressed by operating the piston 27, but the dead space inside the cylinder is formed when the piston is located at the bottom dead center. And the space volume from the cylinder outlet to the two intake port side and exhaust port side check valves becomes a dead space. The dead space inside the cylinder is a slight gap formed when the piston and the bottom dead center of the cylinder contact each other, and a path for the intake port and the exhaust port formed in the cylinder partition wall.

Therefore, for the attained vacuum degree, the volume in the total space of the volume in the cylinder space and in-cylinder dead space formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the two intake port side and exhaust port side check valves The relationship between Vla and the volume Vlb in the total space from the cylinder dead space and cylinder outlet formed when the piston is located at the bottom dead center to two intake port side and two exhaust port side check valves becomes important.

In addition, a vacuum pump at the piston top dead center side if the space in the cylinder dead space formed when the piston is positioned at the top dead center and the space volume from the cylinder outlet to the two intake port side and the exhaust port side check valves is much larger than the dead space described above. It does not function as a function, or on the contrary, since a negative pressure degree falls, it is preferable to make the dead space formed at the top dead center side and the bottom dead center side almost equal. That is, the dead space formed at the bottom dead center of the piston becomes an important element of the attained vacuum degree even at the top dead center of the piston because the volume of the cylinder 15 is narrowed by the volume of the support shaft 17 occupying.

The volume in the cylinder space formed when the piston is located at the top dead center and the dead space in the cylinder formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the two check valves on the intake port side and the exhaust port side The relation between the volume Vlb in the total space and the volume Vlb in the total space from the cylinder outlet to the two inlet port side and the exhaust port side check valves formed when the volume Vla and the piston are located at the bottom dead center is Vla / Vlb≥ When it was designed at 40 and suppressed even the amount of leakage at the check valve to some extent, it was found that 30 torr or less can be sufficiently achieved by reciprocating the handle of the vacuum pump P. FIG.

Based on the long-term reliability of the refrigeration cycle, Vla / Vlb≥40 is required even if there is no leak in the design. The relationship between Vla / Vlb is too large and does not interfere with the attained vacuum degree, but the vacuum pump swells or becomes heavy, resulting in poor portability. In addition, the workability of reciprocating the handle 18 also deteriorates.

The number of strokes of the vacuum pump P required for the construction of the air conditioner according to the present invention is determined by the relationship between the interior volume of the indoor unit side piping and the connecting piping 9 and 10 and the volume of the space in the cylinder 15. Found out. If the indoor unit piping and connecting pipes 9 and 10 have a volume of 1.5 liters, the volume in the space of the cylinder 15 is approximately 40 strokes reciprocating at 200 ml to reach a parallel state, and the indoor unit piping and connecting pipes ( In the case where the volume of 9,10) is 2.5 liters, the parallel state is reached by reciprocating about 70 strokes at 250 ml in the volume of the cylinder 15. Therefore, by making these relationships into a database, only the stroke count of the vacuum pump is counted by the sensor according to the present invention, so that the operator can estimate and determine the approximate attained vacuum degree.

A shaft seal which can be used in the present invention is an elastomer having a hardness of about 60 to 90 in a spring type A form. Specifically, CR, EPDM, NBR, etc. may be applied in addition to HNBR. In the embodiment, the shaft seals 21a and 21b are referred to as two points in contact with the support shaft 17 as the O-ring double structure. At this time, the outer contact point is the support shaft when the support shaft is outside the cylinder. It acts to remove dust attached to it. Moreover, by making two or more points contact | abut the sudden movement of a support shaft, even if one side leaked air, it could shield at the other contact point.

As the check valve configuration of the exhaust port 30 which can be used in the present invention, in addition to the same as in the embodiment, an open / close valve structure may be constituted by moving an animal made of a light and small metal sphere in the pipe. In addition to nylons, fluorine-based resins such as PFA and PVDF, and PPS can also be used. In the check valve used in the present invention, the inlet port 31 side is more important than the minimum operating pressure difference than the exhaust port 30 side. That is, the exhaust port 30 side is a direction in which the pressure difference gradually increases when the vacuum pump P is operated, but on the intake port 31 side, the pressure difference in the indoor unit and the connection pipes 9 and 10 and the cylinder 15 decreases. to be.

Therefore, it is preferable that the check valve on the intake port side can close the valve even at a small differential pressure. Specifically, the minimum operating pressure difference is 10 or less. Moreover, it is preferable that the amount of gas leakage is 1 ml / min or less in the state of a differential pressure of 1 kgf / cm <2>. This is because, as soon as the operator stops the handle operation of the vacuum pump, the workability deteriorates in such a case that the reached vacuum degree so far drops sharply. Specifically, in the compression coil spring used in the examples, a check valve for closing the flow path was preferable in pressing the resin film onto the valve receiving seat. The spring constant of the compression coil spring at that time was 0.01 to 0.04 N / mm. When the spring constant is less than 0.01 N / mm, the compression coil spring may be affected by gravity due to the direction of the vacuum pump when the work is performed, and in some cases, it may not be able to exhibit sufficient function.

In the present embodiment, the vacuum pump is operated using a manual handle, but a mechanism mechanism may be provided in which a pedal is provided to synchronize the operation of the piston 27 with the pedal. Considering the global environment, a sufficient degree of vacuum can be obtained by a manpower using a handle or a pedal with respect to a conventional electric vacuum pump, which greatly reduces the environmental load in the construction of an air conditioner.

Example 9

FIG. 33 is a configuration diagram of a refrigeration cycle of an air conditioner in Example 9 constructed using a vacuum pump of the present invention, and is substantially the same as the configuration of Example 1 shown in FIG. 1.

Fig. 34 is a schematic diagram for explaining in detail the configuration of the vacuum pump P and the connection path of the pressure resistant hose 13 according to the present invention. The structure of the vacuum pump P is arrange | positioned so that the piston 28 of aluminum may divide the inside of the cylinder 15 into the upper chamber 15a and the lower chamber 15b inside the main body of the cylinder 15 made of aluminum, and the piston 28 is connected to the handle 18 made of aluminum via the support shaft 17 made of stainless steel.

The handle 18 has an acceleration sensor 181 and a primary battery 182 as shown in FIGS. 3 and 4 therein, a display portion 183 is disposed on an upper surface of the handle 18, and the piston 16 The display unit 183 displays a signal from the acceleration sensor 181 that detects the acceleration G generated by the collision with the cylinder 15 due to the movement of the cylinder 15, and the vacuum degree of the vacuum pump P can be estimated. have. In addition, the exhaust port 30 having the check valve 30a and the intake port 31 having the check valve 31a are provided in the main body partition wall of the cylinder 15, which becomes the top dead center position of the piston 28, The total weight of the vacuum pump body is almost 1 kg.

FIG. 3 is a schematic view showing the main parts of the handle 18 in the vacuum pump P of the present invention, and FIG. 4 is a schematic view showing the acceleration sensor 181 provided in the handle 18.

The acceleration sensor 181 is comprised from the sensor part 41 made thin in the silicon semiconductor 40, and the large weight part 42 of an area. As the operation of the acceleration sensor 181, when the piston 28 reaches the top dead center position or the bottom dead center position of the cylinder 15 by hand, it collides with the wall of the cylinder 15 to stroke the handle 18. When the acceleration G occurs when the movement stops, the weight 42 detects it and the sensor 41 deforms.

By this deformation, the electrical resistance of the diffusion layer 43 formed on the upper part of the sensor part 41 changes. That is, the acceleration sensor 181 detects the stress accompanying the deformation of the sensor portion 41 by the acceleration G by the piezo (piezoelectric) effect of the sensor portion 41, and converts it into a voltage output through the bridge circuit. It is configured to count one stroke when it exceeds a certain schedule. In the meantime, 44 is an electrode and 45 is a case including a bottom plate for fixing the electrode 44.

The flowchart until the acceleration sensor of the vacuum pump of the present invention displays the count is the same as that of Fig. 22 shown in the fourth embodiment.

5 is a configuration diagram showing the check valve 30a provided in the exhaust port 30, and FIG. 6 is a cross-sectional view taken along the line AA ′ of FIG. 5. The vacuum pump P directly connects the check valves 30a and 31a to the main body partition wall of the cylinder 15 which is the top dead center position of the piston 28 when the piston 28 operates inside the cylinder 15. The opening port 37 was provided in the main body partition of the cylinder 15 which is set as the structure and becomes piston bottom dead center position. An air filter 38 is arranged at the tip of the opening port 37. The structure shown in FIG. 5, FIG. 6 was used for the check valve 30a for exhaust ports, and the thing shown in FIG. 7 was used for the check valve 31a for intake ports.

In the check valve 30a, the copper pipe 191 is roll grooved at two places, and the brass valve accommodating seat body 192 is fixed to the groove processing part 191a. The valve body 193 made of nylon collides with the valve receiving seat body 192, and the movement is stopped by the surface contact with the valve receiving seat body 192 having the inclined surface. In the reverse direction, the movement of the valve body 193 is stopped at the groove processing portion 191b. Thus, a check valve structure is provided in which air flows only in the direction of the arrow.

In the check valve 31a, the copper pipe 201 is roll grooved at two places, and the valve accommodating seat body 202 made of brass is fixed to the groove processing part 201a. The compressed coil spring 203 is bonded to the film plate 204, the nylon film plate 204 collides with the brass valve receiving seat 205 by the compressed coil spring force, and the valve housing seat 205 and film plate 202 close the flow path in surface contact, and a check valve structure is provided in which air flows only in the direction of the arrow.

35 shows a detailed configuration diagram when the piston 28 is present at the top dead center position of the cylinder 15. The shaft seals 21a and 21b are provided in the part which the support shaft 17 contact | connects the partition wall of the cylinder 15, and is comprised by making O-ring made of HNBR double. In the piston 28, shaft seals 22a and 22b are also provided at the portion in contact with the inner wall of the cylinder 15 to double the O-ring made of HNBR.

The filter 14 was used in the same configuration as in the fourth embodiment shown in FIG.

Next, the operation of the vacuum pump P will be described. First, the indoor unit is connected to the liquid-side two-way valve 7 and the gas-side three-way valve 8 of the outdoor unit by connecting pipes 9 and 10. The pressure inlet hose 13 of the gauge manifold 12 is connected to the intake port 31 of the vacuum pump P, and the pressure relief hose 11 is connected to the gas side three-way valve 8, respectively.

First, when the handle 18 is pulled in the direction of arrow a (top dead center side), the air in the upper chamber 15a of the cylinder 15 is discharged from the exhaust port 30 to the atmosphere through the check valve 30a, and the basement 15b ) Is sucked in through the air filter 38 from the opening port 37. Next, when the handle 18 is pressed in the direction of the arrow b (lower dead center side), the air inside the indoor unit and the connection pipes 9 and 10 is discharged from the service pressure port 8b to the pressure resistant hose 11 and the gauge manifold ( 12) is sucked into the inner chamber 15a of the cylinder 15 via the check valve 31a rather than the intake port 31 via the pressure-resistant hose 13, and the air of the base 15b is reversed through the opening port 37. From the air through the air filter 38.

Next, the handle 18 is reciprocated so that the handle 18 is pulled in the a direction (top dead center side) again, and the piston 28 is synchronized with this. Then, while the intake check valve 31a and the exhaust check valve 30a provided on the partition wall of the cylinder 15 are replaced, while the piston 28 moves in the direction of the arrow b, the pressure reducing mechanism is constantly provided. Finally, a sufficient negative pressure state can be achieved. At this time, when the handle 18 releases the force from the handle 18 when the handle 18 reaches the bottom dead center of the cylinder 15 in order to remain in the intakeable state from the opening port 37 to the basement 15b, In order to correct the differential pressure of the chamber 15b, the piston 28 is capable of automatic return with a slight force so that the piston 28 is directed upward.

In the vacuum pump P of the present embodiment, as long as the differential pressure can be generated between the internal pressure hose 13 and the cylinder 15 internal loss 15a when the handle 18 reciprocates, the pressure reducing mechanism You can continue. Therefore, the check valve 31a disposed in the intake port 31 is required to have a small minimum operating pressure difference. The minimum operating pressure difference is determined by the spring constant of the compression coil spring body 203 in the check valve as in the present embodiment.

In addition, when the vacuum pump P performs a series of reciprocating operations, the operator collides the piston 16 with the inner wall of the cylinder 15 at the top dead center position and the bottom dead center position, respectively. Can generate an acceleration of 1 to 5 G. Therefore, since the acceleration G is transmitted to the handle 18 through the support shaft 17, the acceleration G is detected by the acceleration sensor 181 and displayed as the number of stroke movements on the display unit 183. It is possible to estimate

Since the vacuum pump P has an O-ring as a double structure in order to prevent air leakage of the shaft seals 21a and 21b, the negative pressure (below 30torr) of the upper chamber 15a in the cylinder 15 and the outside air ( It is possible to sufficiently secure the differential pressure state of 760torr. In addition, when the support shaft 17 is operated in the double structure, it is possible to prevent foreign matters that are easily attached and easily cause engagement with the gas seal portion. In addition, since the O-ring is configured as a double structure in order to prevent air leakage in the shaft seals 22a and 22b, the negative pressure of the upper chamber 15a in the cylinder 15 seen when the piston 28 reciprocates ( 30 torr or less) and the differential pressure between the basements 15b and 760 torr can be sufficiently secured.

The specific installation procedure of the air conditioner will be described. The indoor unit is connected to the liquid side two-way valve 7 and the gas-side three-way valve 8 of the outdoor unit by connecting pipes 9 and 10. In the vacuum pump P, the pressure resistant hose 13 is connected to the low pressure side port 12b of the gauge manifold 12, and the pressure resistant hose 11 from the center port 12a is the gas side three way valve 8 The pressure resistant hose 11 is in communication with the indoor unit and the inside of the connecting pipes 9 and 10 by being attached to the service port part 8b of the apparatus. In addition, the inside of the pressure resistant hose 13 is in a communication state by opening the low pressure side handle 12c of the gauge manifold 12 in an open state.

Next, since the handle 18 of the vacuum pump is reciprocated as described above, and the number of stroke movements is read by the operator from the display unit 183, the inside of the indoor unit and the connecting pipes 9 and 10 have a sufficient negative pressure state. It can be estimated by estimating that. In addition, the sufficient negative pressure state is confirmed by the operator by the scale of the low pressure gauge 12d of the gauge manifold 12. Immediately thereafter, the low pressure side handle 12c of the gauge manifold 12 is closed and left for a while to confirm that there is no change in the scale of the low pressure gauge 12d. Here, if there is a change in scale, there is a place where air leakage occurs at the connecting portion of the connecting pipes 9 and 10.

Next, by loosening the screw portion 7a of the liquid-side two-way valve 7 and introducing the refrigerant gas on the outdoor unit side, the inside of the connecting pipes 9 and 10 and the indoor unit side piping are slightly static pressure (about 0.2 kgf / cm 2). ) After that, the pressure resistant hose 11 is removed from the service port 8b, and the screw portion 7a of the liquid-side two-way valve 7 is rotated a quarter turn to be further pressurized (3 to 6 kgf / cm 2). Recheck the piping for leaks. Lastly, the screw portion 7a of the liquid side two-way valve 7 is completely opened, and the screw portion 8a of the gas-side three-way valve 8 is also fully opened. The task is complete.

In the present embodiment, the interior volume of the indoor unit side pipes and the connection pipes 9 and 10 including the indoor heat exchanger 6 is 1.5 liters. In the vacuum pump (P), the loss inner space volume formed when the piston is located at the bottom dead center is 150 ml, and from the cylinder outlet formed when the piston is located at the top dead center to two intake port side and two exhaust port side check valves. The volume in the total space of was 1.5 ml. However, the flow path space for a port which arises in a cylinder main body partition wall was considered to be included here. The cylinder dead space formed when the piston was located at the top dead center was 2 ml. The volume in the loss chamber formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port are defined as the volume Vla, and the piston is located at the top dead center. When the volume in the total space from the cylinder dead space and the cylinder outlet formed at the time to the intake port check valve and the exhaust port check valve is set to Vlb, the relationship between Vla and Vlb is Vla / Vlb = 44. Fig. 35 specifically illustrates the use of the volume in the total space from the cylinder outlet when the piston is located at the top dead center to the check valve for the intake port and the check valve for the exhaust port, and the Vlb portion that becomes the dead space in the cylinder.

In this configuration, 30 torr can be achieved by carrying out the process according to the above-described working procedure and reciprocating the handle by 40 strokes using a vacuum pump. The relationship between stroke frequency and internal pressure is shown in FIG. 11 as a decompression progress state at this time. Although the decompression progress was confirmed up to 50 strokes, the attained vacuum reached equilibrium at 40 strokes and no further progress was made.

Therefore, when the vacuum pump according to the present embodiment was applied to the one having an internal volume of 1.5 liters, it was found that 40 strokes became the target of the attained vacuum degree. The exact degree of vacuum was monitored using a separate digital pressure sensor. Refrigerant was R410A, and refrigeration oil was set to an overload condition of 115 ° C for the compressor-based air conditioner, and the reliability test was performed for 5000 hours using both the indoor unit and the outdoor unit as 40 ° C as the cooling high temperature condition. . As a result, no abnormality occurred in particular.

Example 10

Fig. 36 is a schematic view for explaining in detail the configuration of the vacuum pump and the connection path of the pressure resistant hose according to the present embodiment. In this embodiment, the vacuum pump is almost the same as that of the ninth embodiment, and thus the detailed description thereof will be omitted, and the description will be mainly focused on other parts. The vacuum pump P is provided with a one-touch pipe joint 26 as a joining portion detachable through a pressure-resistant hose 25 in the check valve 31a of the intake port 31 provided in the cylinder 15. The opening port 37 is also provided with a screw-in closing cap 39 as a jig capable of blocking intake and exhaust.

19 is a cross-sectional configuration diagram of the one-touch pipe joint 26. A concrete structure is demonstrated below. The release bush 34 is disposed along the pressure resistant hose, and the cylindrical release bush 341 is fixed by installing the cylindrical guide 343 and the collet 344 on the cylindrical pipe joint body 342. have. A cylindrical chuck 345 is disposed between the release bush 341 and the collet 344, and the chuck 345 is pressed against the inner pressure hose side with the lip seal 346 made of CR rubber. It meshes with the outer circumference of the pressure resistant hose and prevents the pressure hose from falling out.

In addition, when the release bush 341 enters the inner side along the pressure hose 13, the front end of the chuck 345 can engage and release the pressure. Therefore, the pressure hose 13 can be easily removed from the joint body 342. I can make it. If the lip seal 346 is sufficiently functioning, air leakage can be prevented.

Next, the installation procedure of the specific air conditioner in a present Example is demonstrated. First, the pressure resistant hose 13 is connected to the one-touch pipe joint 26 provided in the intake port 31 of the vacuum pump P. Loosen the closing cap 39 screwed into the opening port 37, pull up the handle 18 upwards to place the piston 28 at approximately the intermediate position of the cylinder 15, and again, the opening port 37. Insert the closing cap 39 in the screw to cut off the intake and exhaust circuit. In addition, the pressure resistant hose 13 is connected to the low pressure side port 12b of the gauge manifold 12, and the pressure resistant hose 11 is attached to the service port part 8b. Therefore, the pressure resistant hose 11 is in communication with the interior of the indoor unit and the connection pipes 9 and 10. In addition, the pressure resistant hose 13 is in a communication state by opening the low pressure side handle 12c of the gauge manifold 12 in an open state.

Next, the operation mechanism of the vacuum pump will be described. First, when the handle 18 is pushed in the direction of arrow b (lower dead center side), the air inside the indoor unit and the connection pipes 9 and 10 is discharged from the service port part 8b to the pressure resistant hose 11, the gauge manifold 12, The pressure is sucked into the inner chamber 15a of the cylinder 15 through the check valve 31a of the intake port 31 rather than the pressure hose 13. On the contrary, since the air in the basement 15b is a closed space, the air is compressed, so when the force is released to the handle 18 at the bottom dead center, the reaction and loss of the compressed air 15a and the basement 15b Due to the synergistic effect of the differential pressure, the piston 28 can be guided and returned automatically without most of the force in the upward direction of the arrow b direction. The air in the chamber 15a is discharged to the atmosphere through the check valve 30a of the exhaust port 30. Again, the handle 18 is pushed downward to further advance the indoor unit and the connection pipes 9 and 10 in the negative pressure direction.

By reciprocating the handle 18 of the vacuum pump in this manner, it is possible to obtain a vacuum pump having a decompression mechanism only in the b direction. Since the operator reads the number of stroke movements of the piston 28 from the display unit 183, it can be estimated by judging that the interior of the indoor unit and the connecting pipes 9 and 10 has become a sufficient negative pressure state. In addition, the sufficient negative pressure state is confirmed by the operator by the scale of the low pressure gauge 12d of the gauge manifold 12. Immediately thereafter, the low pressure side handle 12c of the gauge manifold 12 is closed and left for a while to confirm that there is no change in the scale of the low pressure gauge 12d. If there is a change in scale, there is a place where air leakage occurs in the connecting pipe.

Next, by loosening the screw portion 7a of the liquid-side two-way valve 7 and introducing the refrigerant gas on the outdoor unit side, the inside of the connecting pipes 9 and 10 and the indoor unit side piping are slightly static pressure (about 0.2 kgf / cm 2). ) After that, the pressure resistant hose 11 is removed from the service port 8b, and the screw portion 7a of the liquid-side two-way valve 7 is rotated a quarter turn to a pressure state (about 3 to 6 kgf / cm 2). Recheck the leak in the connection pipe. Lastly, the screw portion 7a of the liquid side two-way valve 7 is completely opened, and the screw portion 8a of the gas-side three-way valve 8 is also fully opened. The installation is complete.

Finally, when storing the vacuum pump P, the closing cap 39 screwed into the opening port 37 is again removed, and the handle 18 is pushed downward to drive out the air in the chamber 15b. After that, the closing cap 39 is screwed in, and the pressure resistant hose 13 is also removed from the one-touch pipe joint 26. Thereby, the vacuum pump can be compactized to be excellent in portability.

In this embodiment, the piston 28 is disposed almost at the intermediate position of the cylinder 15, and the closing cap 39 is provided at the opening port 37, but the piston 28 is moved to any position of the cylinder 15. You should decide whether to do as follows. Since the maximum level of air compression at the input is about 100 kg / ㎠, it is good to judge the total contents of the dead space inside the cylinder formed when the piston is located at the bottom dead center and the inside volume of the opening port closed from the cylinder outlet. .

On the other hand, in this embodiment, although the one-touch pipe joint 26 shown in FIG. 19 was used as a connection part which can easily attach | attach a pressure-resistant hose to a vacuum pump, the easily detachable junction part applicable to this invention is limited to this. no. In addition, a tube coupler or the like having no self-sealing mechanism may be used.

Example 11

In this embodiment, the air flow inside the indoor unit-side piping and connecting pipes 9 and 10 of the air conditioner shown in Fig. 33 is replaced with carbon dioxide gas using a carbon dioxide gas cylinder, and then the same operation procedure as in the ninth embodiment is performed. According to the method of construction in accordance with the present invention, the oxygen in the air inside the indoor unit side piping and the connection piping 9 and 10 is increased more than the construction method of the ninth embodiment, and the accuracy is increased. Pump P was used. The interior volume of the indoor unit side piping and the connection piping 9 and 10 including the indoor heat exchanger 6 was 1.5 liters.

In the vacuum pump, the space in the loss chamber formed when the piston is located at the bottom dead center is 80 ml, and from the cylinder outlet formed when the piston is located at the top dead center to two intake port side and two exhaust port side check valves. The volume in the total space was 1.5 ml. However, the flow path space for a port which arises in a cylinder main body partition wall was considered to be included here. The cylinder dead space formed when the piston was located at the top dead center was 2 ml. The space in the loss chamber formed when the piston is located at the bottom dead center and the volume in the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port are defined as the volume Vla in the space, and the piston is located at the top dead center. When the volume in the total space from the cylinder dead space and the cylinder outlet formed at the time of the intake port to the intake port check valve and the exhaust port check valve is set to Vlb, the relationship between Vla and Vlb is Vla / Vlb = 23.

First, using the carbon dioxide cylinder, the air in the indoor unit side piping and the connection piping 9 and 10 was replaced with carbon dioxide gas. That is, the outlet of the carbon dioxide gas cylinder is connected to the service port 8b of the liquid gas 3-way valve 8, and the flared nut (not shown) of the liquid-side 2-way valve 7 is released to connect the piping 9 ) Is connected to the atmosphere, the air of the connecting pipe 10, the internal piping of the indoor unit, and the connecting pipe 9 is pushed out to the atmosphere by carbon dioxide gas, and when replaced with carbon dioxide gas, the flannel nut of the liquid-side two-way valve 7 Closes, and removes the carbon dioxide cylinder from the service port (8). Thereafter, 60 torr was achieved by using a vacuum pump according to the same working procedure as in Example 9. The discharge temperature of the compressor was set to 115 ° C for the air conditioner whose refrigerant was R410A and the ester oil was ester, and the reliability test was conducted for 5000 hours using both the indoor unit and the outdoor unit as 40 ° C as the cooling high temperature condition. As a result, no abnormality occurred in particular.

In this embodiment, the gas is replaced by the carbon dioxide gas inside the indoor unit piping and the connecting pipe, but the specific gas that can be used in the present invention is not limited thereto. In addition, it is possible to apply a gas hardly affecting the reliability of the refrigeration cycle. Specifically, in addition to carbon dioxide gas, gases such as nitrogen gas, methane, ethane, propane, isobutane and argon can be used.

As described above, in the decompression mechanism of the vacuum pump according to the present invention, the inside of the cylinder may generate a decompression by the decompression mechanism only when the piston is operated downward, but an in-cylinder dead space formed when the piston is located at the top dead center. And the space volume from the cylinder outlet to the check valve for intake port and check valve for exhaust port becomes dead space. The cylinder dead space is a slight gap formed when the piston is in contact with the cylinder top dead center surface in the support shaft direction, and a path for the intake port and an exhaust port formed in the cylinder partition wall. Therefore, with respect to the attained vacuum degree, the total inner volume of the lost internal space formed when the piston is located at the bottom dead center, the volume in the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port, and the piston are similar. The relationship between the dead space inside the cylinder formed when positioned at the point and the total volume Vlb from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port becomes important. The relationship between Vla and Vlb was designed to be Vla / Vlb? 40, and it was found that 30 torr or less could be sufficiently achieved by reciprocating the handle of the vacuum pump if the amount of leakage from the check valve was suppressed to some extent. Based on the long-term reliability of the refrigeration cycle, Vla / Vlb≥40 is required even if there is no leak in the design. Even if the relationship between Vla / Vlb is too large, it does not affect the attained vacuum degree, but the vacuum pump swells or becomes heavy, resulting in poor portability. It also worsens the workability to reciprocate the handle.

It was found that the stroke frequency of the vacuum pump required for the construction of the air conditioner according to the present invention is determined by the relationship between the volume of the indoor unit side pipe and the connecting pipe and the volume in the cylinder space. If the indoor unit piping and connecting piping have a volume of 1.5 liters, the cylinder volume reaches an equilibrium state by reciprocating the stroke in a volume of 150 ml at about 40 strokes, and if the contents of the indoor piping and connecting piping are 2.5 liters of cylinder space, Equilibrium was reached with a volume of about 70 stroke reciprocating at 250 ml. Therefore, by managing these relationships in a database, only the stroke frequency of the vacuum pump was managed, and the operator was able to estimate and judge the approximate attained vacuum degree.

The piston seal that can be used in the present invention has an O-ring double structure like the shaft seal for the support shaft. However, since the piston is operated as a closed space by blocking the opening port of the basement, the piston is compressed downward. This occurs. At this time, the O-ring double structure was excellent in order to sufficiently suppress air leakage from the basement to the loss.

In each of the above embodiments, a dryer is disposed in the outdoor unit main body. In the vacuum pump according to the present invention, it is difficult to sufficiently exclude moisture existing in the indoor unit and the connection pipe compared with the electric vacuum pump. Therefore, the air conditioner in which the dryer is arranged in the refrigeration cycle tends to ensure long-term reliability.

According to the vacuum pump of the present invention, it is possible to work in a simple and short time while suppressing adverse effects on the environment in the construction of the air conditioner.

Claims (13)

An intake port 20 in which a cylinder 15 is partitioned into two chambers by a piston 16 and check valves 19a, 19b, 20a, and 20b are disposed at the cylinder top dead center position and the bottom dead center position of the divided two chambers, respectively. And the exhaust port 19, and the piston 16 is operated in any direction, when the exhaust port 19 is connected to each other, the cylinder (15) by discharging the gas inside the cylinder (15) And the exhaust port side in the pressurized state is connected to the intake port (20), so that the intake port side in the cylinder is in a negative pressure state. The compression coil spring 203 is disposed inside the check valves 20a and 20b disposed in the intake port 20, and the spring constant of the compression coil spring 203 is 0.01 to 0.04 N /. The vacuum pump, characterized in that mm. As a method of constructing an air conditioner when an air conditioner configured by connecting both an indoor unit (B) and an outdoor unit (A) with connection pipes (9, 10) using a vacuum pump, The vacuum pump is divided into two chambers by the piston 16 in the cylinder 15, and check valves 19a, 19b, 20a, and 20b are disposed at the cylinder top dead center position and the bottom dead center position of the divided two chambers, respectively. Having an intake port 20 and an exhaust port 19, At least as the first step, the exhaust port 19 is connected to each other, and the piston 16 is operated in any direction, so that the indoor unit B and the connection pipe are discharged by the gas discharged from the inside of the cylinder 15. (9,10) is pressurized inside, As a second step, the intake port (20) is connected to each other, the indoor unit (B) and the connecting pipe inside (9, 10) construction method of the air conditioner, characterized in that the negative pressure state. The method of claim 3, wherein the first connection portion for connecting the exhaust port (19, 30), the second connection portion for connecting the intake port (20, 31), the first connection portion and the exhaust port (19 And a joining part (33a) for joining the parts, and a joining part (35a) for connecting the second connecting part and the intake port (20,31) part. The construction method of the air conditioner according to claim 3 or 4, wherein the joining portions (33a, 35a) are detachable. The intake port (20,31) and the exhaust port are divided into two chambers by pistons (16, 27), and check valves are disposed at the top dead center position and the bottom dead center position of the cylinders of the two chambers in the partitioned cylinder. (19, 30), each of the intake ports (20, 31) are connected by one connecting port portion, when the differential pressure of the two chambers is initial, no matter which direction the piston (16, 27) is operated And a sensor (181) disposed at the inlet port (20,31) side under a negative pressure and gradually counting the reciprocating motion of the piston (16,27) while gradually attenuating from the vacuum pump. 7. The vacuum pump according to claim 6, wherein the sensor (181) is an acceleration sensor, and its response sensitivity is 1 to 5G. 7. The vacuum pump according to claim 6, wherein the sensor (181) is a configuration in which a sun spring or cantilever type support arm (134) is used. 7. The vacuum pump according to claim 6, wherein the acceleration sensor is mechanical, and the method is contact pressure type, reed switch type or contact conduction type. The inside of the cylinder 15 is divided into the upper chamber 15a and the lower chamber 15b by the piston 28, and the piston 28 operates a handle for operating the piston through the support shaft 17 disposed on the upper side. 18, an intake port 31 in which the check valve 31a is disposed and an exhaust port 30 in which the check valve 30a is disposed, and the bottom of the cylinder 15 An opening port 37 capable of intake and exhaust gas is formed on the 15b, and the piston 28 is operated in a downward direction, whereby the loss 15a is in a negative pressure state, and an intake action from the opening port 37 is obtained. Vacuum pump, characterized in that for moving the piston (28) upward. As a construction method of an air conditioner when an air conditioner constructed by connecting both an indoor unit and an outdoor unit with a connecting pipe using a vacuum pump, The vacuum pump is divided into a cylinder 15 by a piston 28 into an upper chamber 15a and a lower chamber 15b, and the piston 28 is connected to the piston through a support shaft 17 disposed on the upper chamber side. The intake port 31 and the exhaust port 30, which are connected to the handle 18 for operating 28, and the check valves 31a and 30a are disposed at the top dead center position of the upper chamber 15a, and the cylinder ( The opening 15 of the base 15b of the 15 which can intake and exhaust, The sum of the space in the loss chamber formed when the piston 28 is located at the bottom dead center and the volume in the space from the cylinder outlet to the intake port check valve 31a and the exhaust port check valve 30a. In-space volume Vla, the dead space inside the cylinder formed when the piston 28 is located at the top dead center, and the check valve 31a for the intake port and the check valve 30a for the exhaust port from the cylinder outlet. The relationship between the volume Vlb in the total space up to Vla / Vlb≥20, By operating the piston in the downward direction, after the loss is in a negative pressure state, the indoor unit (B) and the induction movement of the piston (28) in the upward direction by inducing action from the opening port (37). The construction method of the air conditioner, characterized in that the inside of the connection pipe (9, 10) in a negative pressure state. The method of claim 11, wherein during installation, a specific gas is introduced into the indoor unit (B) and the connection pipes (9, 10) to replace the air in the indoor unit (B) and the connection pipes (9, 10) with the specific gas. Then, the interior of the air conditioner, characterized in that the indoor unit (B) and the connection pipe (9, 10) inside the negative pressure state. The construction method of the air conditioner according to claim 11 or 12, wherein Vla / Vlb?