JP3755481B2 - Construction method of vacuum pump and air conditioner using it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum pump required for construction of a separate type air conditioner or the like that joins both an indoor unit and an outdoor unit with a connection pipe and circulates a refrigerant gas to perform air conditioning, and an air conditioner using the vacuum pump. It relates to the construction method.
[0002]
[Prior art]
This kind of conventional air conditioner construction method exhausts the air in the indoor unit and connection pipe after construction, so the refrigerant gas for the outdoor unit is purged more than the specified amount necessary for the air conditioning function to be used. The refrigerant side gas is filled and introduced from the liquid side two-way valve provided in the outdoor unit to discharge the connection pipe and the air inside the indoor unit. At that time, the gas side three-way valve provided in the outdoor unit Refrigerant gas was also released into the atmosphere from a valve called the service port.
[0003]
On the other hand, in recent years, it has been a problem to release refrigerant gas with a high ozone depletion coefficient and high global warming coefficient to the atmosphere during construction of air conditioners due to the environmental regulations such as ozone layer destruction and global warming. The use of a vacuum pump is recommended. This electric vacuum pump is connected to a valve called the service port of the gas side three-way valve of the outdoor unit, and the electric vacuum pump is operated by supplying power to suck the connection pipe and the air inside the indoor unit. Then, after exhausting and sufficiently reducing the pressure, refrigerant gas is introduced from the liquid side two-way valve into the connection pipe and the indoor unit.
[0004]
However, it is difficult to use the electric vacuum pump under conditions where the outdoor unit is installed on a roof or the like. In addition, the method using the vacuum pump took longer to install the air conditioner than the method using the refrigerant gas in the outdoor unit body.
[0005]
[Problems to be solved by the invention]
In view of the problems of the prior art, the problem to be solved by the present invention is to consider the influence on the environment, and a vacuum pump that enables construction of a simple air conditioner and the like and an air conditioner using the same It is to provide a construction method.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a cylinder in which a piston is divided into an upper chamber and a lower chamber, and the piston is operated by a handle that operates the piston via a support shaft disposed on the upper chamber side. An open port that is connected and has an intake port for disposing a check valve at the top dead center position of the upper chamber and an exhaust port for disposing the check valve, and is capable of intake and exhaust in the lower chamber of the cylinder And a vacuum pump in which the piston is moved upward by an intake action from the opening port.
[0007]
By using the vacuum pump, the upper chamber is brought into a negative pressure state by moving the piston downward, and the piston is moved upward to correct the differential pressure between the upper chamber and the lower chamber by the intake action from the opening port. The piston is guided so as to automatically return to the normal position, and a certain force is required to operate the piston downward, but it is possible to easily operate the piston requiring almost no force upward. Therefore, for example, it is possible to reduce the oxygen in the air that must be eliminated from the indoor units and connection pipes after construction of the air conditioner in consideration of the reliability of the refrigeration cycle, and to rely on the electric type It is sufficiently possible to carry it out manually.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Since the object of the present invention described above can be achieved by using the configuration described in each claim as an embodiment, the configuration described in each claim is described together with the operation of the configuration in addition to the configuration of each claim. Of these, specific terms that require explanation will be described in detail with reference to the embodiment of the present invention by adding a detailed explanation.
[0009]
The invention according to claim 1 for solving the above problem is that the inside of a cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to the piston via a support shaft disposed on the upper chamber side. An intake port which is connected to a handle to be operated and which has a check valve at the top dead center position of the upper chamber and an exhaust port which has a check valve; The vacuum pump has a possible opening port, and moves the piston downward to bring the upper chamber into a negative pressure state, and the piston moves upward by an intake action from the opening port.
[0010]
According to the above embodiment, for example, when an indoor unit is connected to an outdoor unit through a connection pipe during installation work of an air conditioner, a piston is used when used as a vacuum pump for decompression using an intake port and an exhaust port. When the upper chamber is brought into a negative pressure state by moving the piston downward, the piston is guided to automatically return upward in order to correct the differential pressure between the upper chamber and the lower chamber by the intake action from the opening port. The As a result, a certain amount of force is required to operate the piston downward, but a light operation that requires little force upward is possible.
[0011]
In the invention according to claim 2, the inside of the cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, An intake port for disposing a check valve at the top dead center position of the upper chamber and an exhaust port for disposing the check valve; and an opening port for intake and exhaust in the lower chamber of the cylinder. The total volume of the space in the upper chamber formed when the piston is located at the bottom dead center and the volume of the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port The inner space of the cylinder formed when the piston is located at the top dead center, and the total volume of the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port Relationship is instep A Party B ≧ 40, while the upper chamber in a negative pressure state by operating the piston in a downward direction, said piston by inspiration from the open port is a vacuum pump that moves upward.
[0012]
According to the embodiment, the same effect as that of the embodiment of claim 1 can be obtained, and the vacuum pump can make the relationship between the total space inner volume A and the total space inner volume B so that A / B ≧ 40. Since it is set, the space volume relationship between the pressure reducing mechanism portion and the dead space portion in the cylinder is optimized, and a sufficient degree of vacuum can be reached.
[0013]
The invention according to claim 3 is a vacuum pump in which a check valve disposed in the intake port has a compression coil spring disposed therein, and a spring constant of the compression coil spring is 0.01 to 0.04 N / mm. The check valve can sufficiently reduce the minimum operating pressure difference.
[0014]
According to a fourth aspect of the present invention, in the check valve disposed in the intake port, a vacuum pump having a minimum operating pressure difference of 10 torr or less can reduce the ultimate vacuum to a sufficient level of 30 torr or less. become. In other words, if the minimum operating pressure difference is large, the vacuum pump for decompression will stop functioning no matter how much the piston is reciprocated, it is necessary to use a check valve with a sufficiently small minimum operating pressure difference. However, this embodiment can sufficiently cope with this.
[0015]
The invention according to claim 5 is a vacuum pump in which an air filter is disposed in the opening port, and the air filter cleans the air flowing into the lower chamber as the piston moves upward from the bottom dead center of the cylinder. In addition, it is possible to reduce the noise of the air flow discharged from the lower chamber as the piston moves downward from the top dead center of the cylinder.
[0016]
The invention according to claim 6 is a vacuum pump in which a detachable jig capable of blocking the flow passage is provided in the opening port or the air filter, and the jig is in a state where, for example, the piston is at the top dead center position. When the opening port or the air filter flow path is blocked, the lower chamber of the cylinder is sealed, and the piston is moved downward, so that the air in the lower chamber is compressed. The synergistic effect of the reaction and the pressure difference between the upper chamber and the lower chamber further induces the piston to automatically return upward.
[0017]
The invention according to claim 7 is a vacuum pump in which a joint part to which a hose can be attached to and detached from the intake port is disposed, and a pressure-resistant hose is connected to the intake port only when the vacuum pump is used by the joint part. Makes it possible to remove the pressure hose.
[0018]
The invention according to claim 8 is a vacuum pump in which an acceleration sensor capable of counting the number of strokes of the reciprocating motion of the piston is disposed on any of the piston, the support shaft, and the handle. It is possible to detect the acceleration G due to the impact received by the piston by the reciprocating motion of any position at any installation location.
[0019]
The invention according to claim 9 is a vacuum pump in which the response sensitivity of the acceleration sensor is 1 to 5 G, and the acceleration sensor can count only the acceleration G when the piston collides with the cylinder inner wall.
[0020]
Invention of Claim 10 is the construction method of the air conditioner at the time of installing the air conditioner comprised by connecting both an indoor unit and an outdoor unit with connection piping using a vacuum pump, The said vacuum pump The inside of the cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side. An intake port for disposing a check valve and an exhaust port for disposing a check valve, an opening port capable of intake and exhaust in the lower chamber of the cylinder, and the piston at the bottom dead center. The upper interior space volume formed when positioned, and the total volume of the space from the cylinder outlet to the intake port check valve and the exhaust port check valve, and the piston is dead. Before being formed when located at a spot The relationship between the cylinder internal dead space and the total space volume B from the cylinder outlet to the intake port check valve and the exhaust port check valve is A / B ≧ 40, and the piston is moved downward. After the upper chamber is brought into a negative pressure state by operating, the indoor unit and the inside of the connection pipe are in a negative pressure state while guiding the piston to move upward by the intake action from the opening port. It is the construction method of the air conditioner.
[0021]
According to the above embodiment, the same operation as that of the embodiment of the first aspect can be obtained, and a portion that becomes a dead space on the vacuum pump structure of the present invention in constructing the pressure reducing mechanism in the cylinder. It is possible to obtain a sufficient ultimate vacuum by optimizing the relationship with the space volume in which the maximum work can be performed in the cylinder.
[0022]
The invention according to claim 11 is an air conditioner construction method for installing an air conditioner configured by connecting both an indoor unit and an outdoor unit with a connection pipe, using a vacuum pump, and After the specific gas is introduced into the indoor unit and the connecting pipe and the air in the indoor unit and the connecting pipe is replaced with the specific gas, the vacuum pump has a piston in the cylinder and an upper chamber and a lower chamber. An intake port which is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and which has a check valve at a top dead center position of the upper chamber; An upper port space formed when the piston is located at a bottom dead center. And front from the cylinder outlet The total volume of the space between the intake port check valve and the exhaust port check valve, the cylinder internal dead space formed when the piston is located at the top dead center, and the cylinder outlet The relationship between the total volume in the space between the check valve for the intake port and the check valve for the exhaust port is A / B ≧ 20, and the upper chamber is negatively pressured by operating the piston downward. It is a construction method of an air conditioner in which the indoor unit and the inside of the connection pipe are brought into a negative pressure state while inducing the piston to move upward by an intake action from the opening port after being in a state. .
[0023]
According to the above embodiment, the vacuum pump is used after substituting a gas that does not easily cause a problem in the refrigeration cycle even if it remains during installation work, for example, carbon dioxide gas and air in the indoor unit and connection pipe. It will be possible to perform more reliable installation work.
[0024]
Invention of Claim 12 is the construction method of the air conditioner at the time of installing the air conditioner comprised by connecting both an indoor unit and an outdoor unit with connection piping using a vacuum pump, The said vacuum pump The inside of the cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side. An intake port for disposing a check valve and an exhaust port for disposing a check valve, an opening port capable of intake and exhaust in the lower chamber of the cylinder, and the piston at the bottom dead center. The upper interior space volume formed when positioned, and the total volume of the space from the cylinder outlet to the intake port check valve and the exhaust port check valve, and the piston is dead. Before being formed when located at a spot The relationship between the cylinder internal dead space and the total space volume B from the cylinder outlet to the intake port check valve and the exhaust port check valve is A / B ≧ 40, and the piston is placed above the cylinder. After the dead center position or the lower chamber is arranged in a state having a predetermined volume in the space, the opening port is blocked by a jig, and the piston is moved downward from the state in which the lower chamber is a sealed space. Thus, after the upper chamber is brought into a negative pressure state, the inside of the indoor unit and the connection pipe are in a negative pressure state while guiding the piston to move upward due to a reaction of air compression to the lower chamber. It is the construction method of the air conditioner.
[0025]
According to the said embodiment, the same effect | action as embodiment of Claim 1 and Claim 2 is acquired. Also, for example, when the piston is placed at the top dead center position, the intake port and the exhaust port are blocked by a jig, and when the piston is reciprocated up and down with the lower chamber of the cylinder in a sealed space, the lower chamber is As the piston moves downward, the air is compressed. When the operating force of the piston is loosened, the piston can automatically return upward due to the reaction of the compressed air and the synergistic effect of the differential pressure between the upper and lower chambers. Thus, it becomes possible to induce more sufficiently.
[0026]
The invention according to claim 13 is an air conditioner construction method for installing an air conditioner configured by connecting an indoor unit and an outdoor unit with a connecting pipe using a vacuum pump, and in the installation work After the specific gas is introduced into the indoor unit and the connecting pipe and the air in the indoor unit and the connecting pipe is replaced with the specific gas, the vacuum pump has a piston in the cylinder and an upper chamber and a lower chamber. An intake port which is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and which has a check valve at a top dead center position of the upper chamber; An upper port space formed when the piston is located at a bottom dead center. And front from the cylinder outlet A total internal volume volume of the intake port check valve and the internal volume of the exhaust port check valve, the cylinder internal dead space formed when the piston is located at the top dead center, and the cylinder The relationship between the total space volume B from the outlet to the check valve for the intake port and the check valve for the exhaust port is A / B ≧ 20, and the piston is located at a top dead center position or a lower chamber in the cylinder. Then, the opening port is blocked by a jig, and the upper chamber is negatively pressured by moving the piston downward from a state where the lower chamber is closed. After the air conditioner is brought into the state, the air conditioner is placed in a negative pressure state inside the indoor unit and the connection pipe while inducing the piston to move upward due to the reaction of air compression to the lower chamber. It is a method.
[0027]
According to the embodiment, the same operation as that of the embodiment described in claim 11 can be obtained. Also, for example, when the piston is placed at the top dead center position, the intake port and the exhaust port are blocked by a jig, and when the piston is reciprocated up and down with the lower chamber of the cylinder in a sealed space, the lower chamber is Since the piston is compressed by the downward movement of the air, the piston can be automatically returned upward by the synergistic effect of the reaction of the compressed air and the differential pressure between the upper and lower chambers when the operating force of the piston is loosened. It is possible to induce more fully.
[0028]
The invention according to claim 14 is an air conditioner construction method using any one or more of carbon dioxide, nitrogen gas, hydrocarbon gas or argon gas as the specific gas, and remains to some extent during installation work. Even in this case, it is possible to prevent the refrigeration cycle from being defective.
[0029]
【Example】
Embodiments of a vacuum pump of the present invention and a method for constructing an air conditioner using the same will be described below with reference to the drawings.
[0030]
Example 1
FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner according to a first embodiment that is constructed using the vacuum pump of the present invention. The refrigeration cycle includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion device 4, a dryer 5, and an indoor unit heat exchanger 6 as representative components. The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion device 4, and the dryer 5 are disposed in the outdoor unit, and the indoor unit heat exchanger 6 is disposed in the indoor unit.
[0031]
The outdoor unit is provided with a liquid side two-way valve 7 and a gas side three-way valve 8. Connection pipes 9 and 10 connecting the outdoor unit and the indoor unit 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. By opening the threaded portion 7a, the pipe on the outdoor unit side and the connecting pipe 9 are communicated. The gas side three-way valve 8 has a screw portion 8a and a service port portion 8b, and the pipe on the outdoor unit side and the connection pipe 10 are communicated with each other by opening the screw portion 8a.
[0032]
In the separate type air conditioner of this embodiment, both the outdoor unit and the indoor unit are connected in an annular manner by connecting pipes 9 and 10, and an amount of refrigerant gas necessary for exhibiting a predetermined cooling / heating capability is previously stored in the outdoor unit. The inside of the pipe of the machine is filled, and the screw portion 7a of the liquid side two-way valve 7 and the screw portion 8a of the gas side three-way valve 8 are closed. Then, after the construction in which the indoor unit is connected to the outdoor unit through the connection pipes 9 and 10, oxygen in the air that must be excluded from the interiors of the indoor unit and the connection pipes 9 and 10 in consideration of the reliability of the refrigeration cycle. The vacuum pump P of the present invention shown in FIG. 2 is used to perform evacuation for reducing to a sufficient level.
[0033]
That is, the outdoor unit and the indoor unit are connected by connecting pipes 9 and 10, and the central port 12a of the gauge manifold 12 is connected to the service port part 8b of the gas side three-way valve 8 of the outdoor unit via the pressure hose 11, Further, the low pressure side port 12b of the gauge manifold 12 and the vacuum pump P are connected by a pressure hose 13 serving as an intake port. The pressure hose 13 is provided with a filter 14 in its path.
[0034]
FIG. 2 is a schematic diagram for explaining in detail the configuration of the vacuum pump P of the present invention and the connection path of the pressure-resistant hose 13. The structure of the vacuum pump P is that an aluminum piston 16 is arranged inside a body of an aluminum cylinder 15 so that the inside of the cylinder 15 is divided into an upper chamber 15A and a lower chamber 15B. The piston 16 is a support shaft 17 made of stainless steel. It is connected with the handle 18 made of aluminum.
[0035]
The handle 18 includes therein an acceleration sensor 181 and a primary battery 182 shown in FIGS. 3 and 4, and a display unit 183 is disposed on the upper surface of the handle 18. A signal from the acceleration sensor 181 for detecting the generated acceleration G is displayed on the display unit 183 so that the degree of vacuum of the vacuum pump P can be estimated. Further, the exhaust port 19a having the check valve 19 and the intake port 20a having the check valve 20 are provided in the main body partition wall of the cylinder 15 at the top dead center position of the piston 16, and the total weight of the vacuum pump main body is approximately. 1 kg.
[0036]
FIG. 3 is a main part schematic diagram showing the configuration of the handle 18 in the vacuum pump P of the present invention, and FIG. 4 is a schematic configuration diagram showing the acceleration sensor 181 provided on the handle 18. The acceleration sensor 181 includes a sensor portion 41 made of a silicon semiconductor 40 and a weight portion 42 having a large area. As an operation of the acceleration sensor 181, when the piston 16 manually reaches the top dead center position or the bottom dead center position of the cylinder 15 and collides with the wall of the cylinder 15 to stop the stroke motion of the handle 18, the acceleration is accelerated. When G occurs, the weight part 42 senses it and the sensor part 41 is distorted.
[0037]
Due to this strain, the electrical resistance of the diffusion layer 43 formed on the upper portion of the sensor unit 41 changes. That is, the acceleration sensor 181 detects the stress accompanying the distortion of the sensor unit 41 by the acceleration G by the piezoelectric effect of the sensor unit 41, converts it into a voltage output through the bridge circuit, and exceeds a certain level or more. It can be counted as one stroke. In the figure, 44 is an electrode, and 45 is a case including a bottom plate for fixing the electrode 44.
[0038]
FIG. 5 is a flowchart from when the acceleration sensor 181 counts the movement of the piston 16 until the negative pressure state on the intake port side of the vacuum pump P is estimated and displayed. A signal output due to the piezo effect in the sensor unit 41 is amplified by the amplifying unit 50, and unnecessary components are excluded from the output components by the filter unit 51. Further, an A / D conversion unit 52 for converting the output into a digital signal is provided. After calculating the negative pressure state on the intake port side by the calculation unit 53, the display unit 183 finally displays the count.
[0039]
6 is a block diagram showing the check valve 19 provided in the exhaust port 19a, and FIG. 7 is a cross-sectional view taken along the line AA 'of FIG. The vacuum pump P is configured such that when the piston 16 operates inside the cylinder 15, the check valves 19 and 20 are directly connected to the main body partition wall of the cylinder 15 which is the top dead center position of the piston 16. An opening port 21 was provided in the main body partition wall of the cylinder 15 to be. An air filter 22 is disposed at the tip of the opening port 21. 6 and 7 was used for the check valve 19 for the exhaust port, and that shown in FIG. 8 was used for the check valve 20 for the intake port.
[0040]
The check valve 19 has two copper pipes 191 formed in roll grooves, and a brass valve receiving seat 192 is fixed to the groove processed portion 191a. The valve body 193 made of nylon collides with the valve seat 192, and the movement is stopped by surface contact with the valve seat 192 in the portion having the inclined surface. In the reverse direction, the movement of the valve body 193 is stopped by the groove processing portion 191b. Therefore, a check valve structure in which air flows only in the direction of the arrow is obtained.
[0041]
The check valve 20 has two copper pipes 201 that are rolled into a groove, and a brass valve receiving seat 202 is fixed to the grooved portion 201a. The compression coil spring 203 is joined to the film plate 204, the nylon film plate 204 collides with the brass valve seat 205 by the compression coil spring force, and the valve seat 205 and the film plate 202 flow in surface contact. The check valve structure is such that the passage is closed and air flows only in the direction of the arrow.
[0042]
The compression coil spring 203 was made of SUS304 having a spring constant of 0.04 N / mm, so that the minimum operating pressure difference could be 10 torr. The brass valve receiving seat body 205 is fixed by the groove processing portion 201b, and the upstream side flow path of the valve receiving seat body 205 reduces the intake flow passage area so that the differential pressure required for the valve operation is increased as much as possible. For this purpose, a tapered portion 205a is provided.
[0043]
FIG. 9 shows a detailed configuration diagram when the piston 16 is present at the top dead center position of the cylinder 15. Shaft seals 23a and 23b are disposed at portions where the support shaft 17 contacts the partition wall of the cylinder 15, and the HNBR O-ring is doubled. Also in the piston 16, shaft seals 24 a and 24 b are arranged at portions where the inner wall of the cylinder 15 is in contact with each other by double HNBR O-rings.
[0044]
FIG. 10 is a diagram illustrating an internal configuration of the filter 14. The filter 14 has a cylindrical main body 143, and the air that has entered the interior immediately collides with the wall 141 and changes its flow in the outer peripheral direction, passes through the cylindrical pulp membrane 142 fixedly disposed inside, and enters the internal path. Eventually it is guided to the outside. Therefore, dust is collected when air passes from the outer circumference path to the inner path side. The collected dust can be visually confirmed by making the cylindrical main body 143 of the filter 14 transparent glass or resin.
[0045]
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 via connection pipes 9 and 10. The suction port 20 a of the vacuum pump P is connected to the pressure hose 13 of the gauge manifold 12 and the pressure hose 11 to the gas side three-way valve 8.
[0046]
First, when the handle 18 is pulled in the direction of arrow A (top dead center side), the air in the upper chamber 15A inside the cylinder 15 is released to the atmosphere from the exhaust port 19a via the check valve 19, and is opened to the lower chamber 15B. Air is sucked from the port 21 through the air filter 22. Next, when the handle 18 is pushed in the direction of the arrow B (bottom dead center side), the air inside the indoor unit and the connection pipes 9 and 10 passes through the pressure hose 11, the gauge manifold 12 and the pressure hose 13 from the service port 8b. Then, the air is sucked into the upper chamber 15A inside the cylinder 15 through the check valve 20 from the intake port 20a, and the air in the lower chamber 15B is released to the atmosphere through the air filter 22 from the opening port 21.
[0047]
Next, the handle 18 is reciprocated so that the handle 18 is pulled again in the direction A (top dead center side), and the piston 16 is synchronized with this. While the check valve 20 for intake and the check valve 19 for exhaust disposed on the partition wall of the cylinder 15 are switched, the piston 16 moves continuously in the direction of the arrow B while having a pressure reducing mechanism, As a result, a sufficient negative pressure state can be achieved. At this time, since the lower chamber 15B can be sucked from the opening port 21, when the handle 18 reaches the bottom dead center of the cylinder 15, if the force is released from the handle 18, the difference between the upper chamber 15A and the lower chamber 15B. The piston 16 can be automatically returned with a slight force so that the piston 16 is guided in the upward direction of the arrow A to correct the pressure.
[0048]
In the vacuum pump P of the present embodiment, when the handle 18 reciprocates, the pressure reducing mechanism can be continued as long as a differential pressure can be generated between the inside of the pressure hose 13 and the upper chamber 15A inside the cylinder 15. Therefore, the check valve 20 disposed in the intake port 20a 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 this embodiment.
[0049]
In addition, when the vacuum pump P performs a series of reciprocating operations, the operator causes the piston 16 to collide with the inner wall of the cylinder 15 at the top dead center position and the bottom dead center position. An acceleration of 1 to 5G can be generated. Accordingly, the acceleration G is transmitted to the handle 18 via the support shaft 17, and the degree of vacuum can be estimated by detecting the acceleration G with the acceleration sensor 181 and displaying it as the number of strokes on the display unit 183. .
[0050]
In the vacuum pump P, the shaft seals 23a and 23b have a double O-ring structure to prevent air leakage as much as possible. Therefore, the negative pressure (30 torr or less) in the upper chamber 15A in the cylinder 15 and the outside air (760 torr) ) Can be sufficiently ensured. In addition, by adopting a double structure, it is possible to prevent foreign matters that are attached and easily bite into the gas seal portion when the support shaft 17 operates. Further, the shaft seals 20a and 20b are also configured with a double O-ring structure to prevent air leakage as much as possible. And the lower chamber 15B (760 torr) can be sufficiently ensured.
[0051]
A 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 hose 13 is connected to the low pressure side port 12b of the gauge manifold 12, and the pressure hose 11 from the central port 12a is attached to the service port part 8b of the gas side three-way valve 8 so that the pressure hose 11 is an indoor unit. And the connection pipes 9 and 10 are in communication with each other. Further, the pressure hose 13 is brought into a communication state by opening the low pressure side handle 12c of the gauge manifold 12.
[0052]
Next, as described above, the handle 18 of the vacuum pump is reciprocated in the direction of arrow A or B, and the operator reads the number of times of the stroke movement from the display unit 183. It can be judged by estimating that the inside of has become a sufficient negative pressure state. Further, a sufficient negative pressure state is finally confirmed by the operator on 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 the scale of the low pressure gauge 12d has not changed. Here, if there is a change in the scale, there is a place where air leakage occurs at the connection portion of the connection pipes 9 and 10.
[0053]
Next, the screw portion 7a of the liquid side two-way valve 7 is slightly loosened, and the refrigerant gas on the outdoor unit side is introduced, so that the inside of the connection pipes 9 and 10 and the indoor unit side pipe is in a slightly positive pressure state (about 0. 2kgf / cm ² ). After that, the pressure hose 11 is removed from the service port portion 8b, and the screw portion 7a of the liquid side two-way valve 7 is again turned 1/4 to further pressurize the state (3 to 6 kgf / cm ² Re-check for leaks in the connecting piping. Finally, the screw 7a of the liquid side two-way valve 7 is completely opened and the screw 8a of the gas side three-way valve 8 is also completely opened. Become.
[0054]
In the present embodiment, the indoor unit side pipes including the indoor heat exchanger 6 and the connection pipes 9 and 10 have an internal volume of 1.5 liters. In the vacuum pump P, the upper indoor space volume formed when the piston is located at the bottom dead center is 150 ml, and the intake port side and the exhaust port side check valve 2 from the cylinder outlet formed when the piston is located at the top dead center. The total volume in the space was 1.5 ml. However, it was considered that the port channel space generated in the cylinder body partition was included here. The cylinder internal dead space formed when the piston was located at the top dead center was 2 ml. The volume of the upper indoor space formed when the piston is located at the bottom dead center and the volume of the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port. Assuming that the total internal volume of the cylinder from the cylinder dead space formed at the top dead center to the intake port check valve and the exhaust port check valve from the cylinder outlet, the relationship between Party A and Party B is Otsu = 44. FIG. 9 specifically shows the total space volume from the cylinder outlet to the intake port check valve and the exhaust port check valve when the piston is located at the top dead center, and the end portion that becomes the dead space in the cylinder. ing.
[0055]
In this configuration, 30 torr was achieved by reciprocating the handle by 40 strokes using a vacuum pump according to the above-described work procedure. The relationship between the number of strokes and the internal pressure is shown in FIG. The progress of depressurization was confirmed up to 50 strokes, but the ultimate vacuum reached an equilibrium state at 40 strokes and did not proceed any further.
[0056]
Accordingly, it was found that when the vacuum pump according to the present example was applied to the one having an internal volume of 1.5 liters, 40 strokes became an indication of the ultimate vacuum. The exact degree of vacuum was monitored using a separate digital pressure sensor. Air conditioner with refrigerant R410A and refrigeration oil ester, set the compressor discharge temperature to an overload condition of 115 ° C, and set the indoor unit and outdoor unit to 40 ° C as cooling high temperature conditions. The test was performed for 5000 hours. As a result, no abnormality occurred.
[0057]
(Example 2)
FIG. 12 is a schematic diagram for explaining in detail the configuration of the vacuum pump of this embodiment and the connection path of the pressure-resistant hose. Since this embodiment uses a vacuum pump that is substantially the same as that of the first embodiment, a detailed description thereof will be omitted, and the description will focus on different parts. In the vacuum pump P, a one-touch fitting 26 as a joint that can be attached and detached via a pressure-resistant hose 25 is disposed on the check valve 19 of the intake port 19 a disposed in the cylinder 15. The opening port 21 is provided with a screw-in type closure cap 27 as a jig capable of blocking intake and exhaust.
[0058]
FIG. 13 is a cross-sectional configuration diagram of the one-touch fitting 26 described above. A specific configuration will be described below. A release bush 261 is disposed along the pressure hose 13, and the cylindrical release bush 261 is fixed by providing a cylindrical guide 263 and a collet 264 on a cylindrical pipe joint main body 262. A cylindrical chuck 265 is disposed between the release bush 261 and the collet 264, and the chuck 262 is placed on the outer periphery of the pressure hose 13 by pushing the tip of the chuck 265 toward the pressure hose 13 side with a lip seal 266 made of CR rubber. Biting and preventing pressure hose from coming off.
[0059]
Further, when the release bush 261 is pushed inward along the pressure hose 13, the biting pressure at the tip of the chuck 265 can be released, so that the pressure hose 13 can be easily detached from the pipe joint main body 262. Air leakage can be prevented if the lip seal 266 functions sufficiently.
[0060]
Next, a specific installation procedure of the air conditioner in the present embodiment will be described. First, the pressure hose 13 is connected to the one-touch fitting 26 disposed in the intake port 20a of the vacuum pump P. The closing cap 27 screwed into the opening port 21 is removed, the handle 18 is lifted upward, the piston 16 is disposed at a substantially intermediate position of the cylinder 15, and the closing cap 27 is screwed into the opening port 21 again to suck and exhaust. Shut off the circuit. The pressure hose 13 is connected to the low pressure side port 12b of the gauge manifold 12, and the pressure hose 11 is attached to the service port portion 8b. Therefore, the pressure hose 11 is in communication with the interior of the indoor unit and the connection pipes 9 and 10. Further, the pressure hose 13 is brought into a communication state by opening the low pressure side handle 12c of the gauge manifold 12.
[0061]
Next, the operation mechanism of the vacuum pump will be described. First, when the handle 18 is pushed in the direction of arrow B (bottom dead center side), the air in the indoor unit and the connecting pipes 9 and 10 is supplied from the service port 8b through the pressure hose 11, the gauge manifold 12 and the pressure hose 13 to the intake port 20a. The check valve 20 is sucked into the upper chamber 15A inside the cylinder 15. On the contrary, since the air in the lower chamber 15B is a sealed space, the air is compressed. Therefore, when the force is loosened from the handle 18 when the bottom dead center is reached, the reaction of the compressed air and the upper chamber 15A occur. Due to the synergistic effect of the pressure difference between the lower chamber 15B and the lower chamber 15B, the piston 16 can be guided and automatically returned in the upward direction of the arrow B with almost no force. Then, the air in the upper chamber 15A is released to the atmosphere through the check valve 19 of the exhaust port 19a. When the handle 18 is pushed downward again, the interior of the indoor unit and the connecting pipes 9 and 10 can be further advanced in the negative pressure direction.
[0062]
By reciprocating the handle 18 of the vacuum pump in this way, a vacuum pump having a pressure reducing mechanism only in the B direction can be obtained. By reading the number of strokes of the piston 16 from the display unit 183, the operator can estimate and estimate that the interior of the indoor unit and the connection pipes 9 and 10 are in a sufficiently negative pressure state. Further, a sufficient negative pressure state is finally confirmed by the operator on 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 the scale of the low pressure gauge 12d has not changed. Here, if there is a change in the scale, there is a place where air leakage occurs in the connecting pipe part.
[0063]
Next, the screw portion 7a of the liquid side two-way valve 7 is slightly loosened, and the refrigerant gas on the outdoor unit side is introduced, so that the inside of the connection pipes 9 and 10 and the indoor unit side pipe is in a slightly positive pressure state (about 0. 2kgf / cm ² ). Thereafter, the pressure hose 11 is removed from the service port portion 8b, and the screw portion 7a of the liquid side two-way valve 7 is rotated by 1/4 to further pressurize the state (3 to 6 kgf / cm ² Re-check for leaks in the connecting piping. Finally, the screw 7a of the liquid side two-way valve 7 is completely opened, and the screw 8a of the gas side three-way valve 8 is also completely opened, so that the installation work relating to the construction of the air conditioner is completed. .
[0064]
Finally, when storing the vacuum pump P, the closure cap 27 screwed into the opening port 21 is removed again, and the handle 18 is pushed downward to expel the air in the lower chamber 15B, and then the closure cap 27 is removed. The pressure hose 13 is also removed from the one-touch fitting 26 by screwing. As a result, the vacuum pump can be made compact so as to be excellent in portability.
[0065]
In this embodiment, the piston 16 is arranged at a substantially intermediate position of the cylinder 15 and the closing cap 27 is attached to the opening port 21 again. However, the position of the piston 16 in the cylinder 15 can be determined as follows. Good. The level at which air can be compressed by human power is a maximum of 10 kg / cm. ² Therefore, the total internal volume of the cylinder internal dead space formed when the piston is located at the bottom dead center and the open port internal space capped from the cylinder outlet may be determined by about 10 to 10 ml.
[0066]
In the present embodiment, the one-touch fitting 26 shown in FIG. 13 is used as a connection part in which the pressure hose can be easily attached / detached to / from the vacuum pump, but the easily attachable / detachable joint part applicable to the present invention is not limited to this. . In addition, a tube coupler or the like that does not have a self-sealing mechanism can be used.
[0067]
Example 3
In the present embodiment, the air in the indoor unit side piping and the connecting piping 9 and 10 of the air conditioner shown in FIG. 1 is replaced with carbon dioxide gas using a carbon dioxide gas cylinder, and then the operation procedure is the same as that of the first embodiment. Therefore, in the method of construction, the accuracy is improved by reducing oxygen in the air inside the indoor unit side piping and the connecting piping 9, 10 as compared with the construction method performed in the first embodiment. The construction vacuum pump P was used. The indoor unit side pipes including the indoor heat exchanger 6 and the connection pipes 9 and 10 had an internal volume of 1.5 liters.
[0068]
In the vacuum pump, the upper indoor space volume formed when the piston is located at the bottom dead center is 80 ml, and the intake port side and exhaust port side check valves 2 are formed from the cylinder outlet formed when the piston is located at the top dead center. The total volume in the space was 1.5 ml. However, it was considered that the port channel space generated in the cylinder body partition was included here. The cylinder internal dead space formed when the piston was located at the top dead center was 2 ml. The volume of the upper indoor space formed when the piston is located at the bottom dead center and the volume of the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port. Assuming that the cylinder internal dead space formed at the top dead center and the total space volume B from the cylinder outlet to the intake port check valve and exhaust port check valve, the relationship between A and B is B = 23.
[0069]
First, carbon dioxide gas was used to replace the air inside the indoor unit side piping and the connecting piping 9 and 10 with carbon dioxide. That is, when the outlet of the carbon dioxide gas cylinder is connected to the service port 8b of the liquid side gas three-way valve 8, the flare nut (not shown) of the liquid side two way valve 7 is loosened and the connection pipe 9 communicates with the atmosphere. 10. When the air in the indoor unit's internal piping and connection piping 9 is pushed out to the atmosphere by carbon dioxide gas and replaced with carbon dioxide gas, the flare nut of the liquid side two-way valve 7 is closed, and the carbon dioxide gas cylinder is removed from the service port 8b. Thereafter, 60 torr was achieved using a vacuum pump according to the same operation procedure as in Example 1. Compressor discharge temperature is set to 115 ° C for air conditioner with R410A refrigerant and ester-based refrigerating machine oil, and the reliability test is 5000 hours with both indoor unit and outdoor unit at 40 ° C as cooling high temperature conditions I did it. As a result, no abnormality occurred.
[0070]
In this embodiment, carbon dioxide gas is used to replace the indoor unit side piping and the inside of the connection piping, but the specific gas that can be used in the present invention is not limited to this. In addition, a gas that hardly affects the reliability of the refrigeration cycle can be applied. Specifically, in addition to carbon dioxide gas, gases such as nitrogen gas, methane, ethane, propane, isobutane, and argon can be used.
[0071]
As described above, in the vacuum pump pressure reducing mechanism according to the present invention, the inside of the cylinder can generate pressure reduction by the pressure reducing mechanism only when the piston is operated downward, but is formed when the piston is located at the top dead center. The space inside the cylinder internal dead space and from the cylinder outlet to the intake port check valve and the exhaust port check valve becomes a dead space. The cylinder internal dead space is a slight gap formed when the piston contacts the cylinder top dead center surface in the support axis direction, and an intake port path and an exhaust port path formed in the cylinder partition wall. Therefore, for the ultimate vacuum, the space in the upper 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 The relationship between the total A, the internal dead space of the cylinder formed when the piston is located at the top dead center, and the total volume of the space from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port is important. Become. It was found that the relationship between A and B was designed with A / B ≧ 40, and if the amount of leakage at the check valve was suppressed to some extent, by reciprocating the handle of this vacuum pump, 30 torr or less could be sufficiently achieved. In view of the long-term reliability of the refrigeration cycle, it is necessary that A / B ≧ 40 even if there is no airtight leakage in the design. The relationship between Party A and Party B is too large and does not interfere with the ultimate vacuum, but the vacuum pump becomes bulky and heavy, making it less portable. In addition, the workability of reciprocating the handle also deteriorates.
[0072]
It was found that the number of strokes of the vacuum pump required for the construction of the air conditioner according to the present invention is determined by the relationship between the internal volume of the indoor unit side piping and connection piping and the cylinder space internal volume. When the internal volume of the indoor unit side pipe and the connection pipe is 1.5 liters, the cylinder space internal volume is 150 ml, and an equilibrium state is reached by reciprocating about 40 strokes. Was 2.5 liters, the cylinder space was 250 ml, and an equilibrium state was reached by reciprocating about 70 strokes. Therefore, by managing only the number of strokes of the vacuum pump by creating a database of these relationships, an operator can estimate and determine the approximate ultimate vacuum level.
[0073]
The shaft seal which can be used in the present invention is an elastomer having a spring type A hardness of about 60 to 90. Specifically, CR, EPDM, NBR, etc. can be applied in addition to HNBR. In the embodiment, the shaft seal for the support shaft has an O-ring double structure. At this time, the contact point on the outer side works to remove dust adhering to the support shaft when the support shaft is outside the cylinder. In addition, by setting two or more points that contact the sudden movement of the support shaft, even if one side leaks air, it can be shielded by the other contact point. The shaft seal for the piston also has an O-ring double structure. However, when the piston is moved downward as a closed space by closing the opening port of the lower chamber, air compression occurs, so that a large differential pressure is generated between the lower chamber and the upper chamber. . At this time, an O-ring double structure was excellent in order to sufficiently suppress air leakage from the lower chamber to the upper chamber.
[0074]
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 configured by moving a movable object made of a light and small metal ball in the pipe in addition to the check valve in the embodiment. . In addition to nylon, fluorine resins such as PFA and PVDF, and PPS can also be used. In the present invention, the minimum operating pressure difference is more important for the check valve used on the intake port side than on the exhaust port side. That is, the pressure difference gradually increases when the vacuum pump is operated on the exhaust port side, but the pressure difference between the indoor unit and the connecting pipe and the cylinder is decreased on the intake port side. Therefore, it is preferable that the check valve on the intake port side can close the valve even with a small differential pressure. Specifically, the check valve has a minimum operating pressure difference of 10 torr or less. Furthermore, differential pressure 1kgf / cm ² In this state, the gas leakage amount is preferably 1 ml / min or less. This is because the workability deteriorates if the ultimate vacuum reached so far suddenly decreases as soon as the operator stops the handle operation of the vacuum pump. Specifically, a check valve that closes the flow path by pressing a resin film against the valve seat with a compression coil spring as used in the examples was preferred. The spring constant of the compression coil spring at that time was 0.01 to 0.04 N / mm. When the spring constant is 0.01 N / mm or less, the compression coil spring may not be able to exhibit a sufficient function due to the influence of gravity depending on the direction of the vacuum pump when the work is performed.
[0075]
In the embodiment, the vacuum pump is operated using a manual handle, but a mechanical mechanism that synchronizes the operation of the piston with the pedal by providing a pedal can also be used. Considering the global environment, the ability to achieve a sufficient degree of vacuum with human power using a handle or pedal compared to the conventional electric type has a great effect of reducing the environmental load during construction of the air conditioner.
[0076]
In this embodiment, as shown in FIG. 1, a dryer is arranged in the outdoor unit. In the vacuum pump according to the present invention, it is difficult to sufficiently remove moisture present in the indoor unit and the connecting pipe as compared with the electric vacuum pump. Therefore, an air conditioner in which a dryer is arranged in the refrigeration cycle is easier to guarantee long-term reliability.
[0077]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the invention, the upper chamber is brought into a negative pressure state by the downward movement of the piston, while the upper chamber and the lower chamber are brought about by the intake action from the opening port. The piston is guided to automatically return upward to compensate for the differential pressure, so a certain amount of force is required for the downward operation of the piston, but it should be lightly operated upward, For example, it is possible to reduce the oxygen in the air that must be eliminated in consideration of the reliability of the refrigeration cycle to a sufficient level, and when operating manually without relying on the electric operation of the piston Very beneficial.
[0078]
According to the second aspect of the present invention, in constructing the decompression mechanism in the cylinder, a part that becomes a dead space on the vacuum pump structure of the present invention, and a space volume capable of maximizing work to the decompression mechanism in the cylinder. By optimizing the relationship, the sufficient ultimate vacuum can be obtained. Therefore, for example, when installing the air conditioner, reduce the oxygen in the air that must be eliminated in consideration of the reliability of the refrigeration cycle, and complete the installation of the air conditioner in a short time. Can do.
[0079]
According to the third aspect of the present invention, a check valve having a sufficiently small minimum operating pressure difference can be provided.
[0080]
According to the invention described in claim 4, the ultimate vacuum can be made to a sufficient level by using a check valve having a sufficiently small minimum operating pressure difference.
[0081]
According to the fifth aspect of the present invention, it is possible to prevent foreign matters such as dust from entering the lower chamber of the cylinder, and to obtain a silencing effect of the exhaust air from the lower chamber.
[0082]
According to the sixth aspect of the invention, it is possible to further sufficiently induce the piston to automatically return upward due to the synergistic effect of the reaction of the compressed air and the pressure difference between the upper chamber and the lower chamber. For example, if the piston is placed at the top dead center position, the opening port or the air filter flow passage is blocked with a detachable jig, and the piston is moved back and forth in a state where the lower chamber of the cylinder is a sealed space. The air is compressed in the chamber, and the piston can be further automatically returned upward by the synergistic effect of the reaction of the compressed air and the pressure difference between the upper chamber and the lower chamber.
[0083]
According to the seventh aspect of the present invention, it is possible to provide a vacuum pump excellent in portability by connecting a pressure-resistant hose to the intake port only when using the vacuum pump, and removing the pressure-resistant hose after work and storing it compactly.
[0084]
According to the eighth aspect of the invention, the acceleration sensor can reliably detect the acceleration G caused by the impact received by the piston by the reciprocating motion at any location and can be easily installed.
[0085]
According to the ninth aspect of the present invention, the acceleration sensor can reliably detect the impact received when the piston is reciprocated by human power, and can manage the degree of vacuum by the stroke of the piston.
[0086]
According to the invention described in claim 10, when the pressure reducing mechanism is configured in the cylinder, a part of the vacuum pump structure according to the present invention, which is inevitably a dead space, and a space volume in which the work to the pressure reducing mechanism can be maximized in the cylinder. A sufficient ultimate vacuum can be obtained by optimizing the relationship between the Therefore, it is possible to reduce the oxygen in the air that must be eliminated in consideration of the reliability of the refrigeration cycle during installation of the air conditioner to a sufficient level and complete the installation of the air conditioner in a short time. it can.
[0087]
According to the eleventh aspect of the present invention, after replacing a gas that does not easily cause a malfunction in the refrigeration cycle, for example, carbon dioxide, and air in the indoor unit and the connecting pipe even when remaining during installation work, Since a vacuum pump is used, more reliable installation work can be performed.
[0088]
According to the twelfth aspect of the present invention, it is possible to further sufficiently induce the piston to automatically return upward due to the synergistic effect of the reaction of the compressed air and the differential pressure between the upper chamber and the lower chamber, The installation work of the harmony machine can be done smoothly.
[0089]
According to the thirteenth aspect of the present invention, after replacing the gas that is unlikely to cause a malfunction in the refrigeration cycle even when remaining in the installation work with the air in the indoor unit and the connecting pipe, the vacuum pump according to the present invention is used. Therefore, more reliable installation work can be performed. Moreover, the synergistic effect of the reaction of compressed air and the differential pressure between the upper chamber and lower chamber can further induce the piston to return automatically upward, and the installation work of the air conditioner can be performed smoothly. it can.
[0090]
According to the invention described in claim 14, by using any one or more of carbon dioxide, nitrogen gas, hydrocarbon gas or argon gas as the specific gas, even if it remains to some extent during installation work, it enters the refrigeration cycle. It can be done without causing problems.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a refrigeration cycle showing an air conditioner according to Example 1 and Example 3 that is constructed using the vacuum pump of the present invention.
FIG. 2 is a diagram showing a configuration of a vacuum pump and a connection path of a pressure hose in Embodiment 1 of the present invention.
FIG. 3 is an enlarged view of the α portion of FIG. 2 showing the vacuum pump according to the first embodiment of the present invention.
FIG. 4 is a schematic configuration diagram showing an acceleration sensor disposed on the handle of the vacuum pump according to the first embodiment of the present invention.
FIG. 5 is a flowchart until the acceleration sensor of the vacuum pump according to the first embodiment of the present invention displays a count.
FIG. 6 is a configuration diagram of a check valve provided at an exhaust port of the vacuum pump according to the first embodiment of the present invention.
7 is a cross-sectional view taken along the line AA ′ of FIG. 6 showing a check valve provided in the exhaust port of the vacuum pump according to the first embodiment of the present invention.
FIG. 8 is a configuration diagram showing a check valve provided in an intake port of a vacuum pump in Embodiment 1 of the present invention.
FIG. 9 is a detailed configuration diagram when the piston shown in FIG. 2 of the vacuum pump according to the first embodiment of the present invention exists at the top dead center position.
FIG. 10 is a configuration diagram of a filter section shown in Embodiment 1 of the present invention.
FIG. 11 is a diagram showing the relationship between the number of strokes of the vacuum pump and the internal pressure in Example 1 of the present invention.
FIG. 12 is a diagram showing a configuration of a vacuum pump and a connection path of a pressure hose in Embodiment 2 of the present invention.
FIG. 13 is a configuration diagram of a one-touch fitting disposed in a vacuum pump main body according to a second embodiment of the present invention.
[Explanation of symbols]
P Vacuum pump
9, 10 Connection piping
15 cylinders
15A upper room
15B lower chamber
16 piston
17 Support shaft
18 Handle
19, 20 Check valve
19a Exhaust port
20a Intake port
21 Open port
22 Air filter
26 One-touch fitting (joint)
27 Blocking Cap (Jig)
181 Acceleration sensor
203 Compression coil spring

Claims (14)

The inside of the cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side. The intake port is provided with a check valve and the exhaust port is provided with a check valve. The cylinder has an opening port capable of intake and exhaust in the lower chamber of the cylinder, and operates the piston downward. In this manner, the upper chamber is brought into a negative pressure state, and the piston is moved upward by the intake action from the opening port. The inside of the cylinder is divided into an upper chamber and a lower chamber by a piston, and the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side. An intake port for disposing a check valve and an exhaust port for disposing a check valve, an opening port capable of intake and exhaust in the lower chamber of the cylinder, and the piston at the bottom dead center. The upper interior space volume formed when positioned, and the total volume of the space from the cylinder outlet to the intake port check valve and the exhaust port check valve. The relationship between the cylinder internal dead space formed when it is located at the dead center and the total space volume B from the cylinder outlet to the intake port check valve and the exhaust port check valve is: 40, before By operating the piston downward, while the upper chamber under negative pressure, the vacuum pump, wherein the piston is moved upward by the suction action from the opening port. The check valve disposed in the intake port has a compression coil spring disposed therein, and a spring constant of the compression coil spring is 0.01 to 0.04 N / mm. The vacuum pump described. The vacuum pump according to claim 3, wherein the check valve disposed in the intake port has a minimum operating pressure difference of 10 torr or less. The vacuum pump according to claim 1, wherein an air filter is disposed in the opening port. The vacuum pump according to any one of claims 1 to 5, wherein a detachable jig capable of blocking the flow passage is disposed in the opening port or the air filter. The vacuum pump according to any one of claims 1 to 6, wherein a joint portion to which a hose can be attached and detached is disposed in the intake port. The vacuum pump according to any one of claims 1 to 7, wherein an acceleration sensor capable of counting the number of strokes of the piston reciprocating movement is disposed on any of the piston, the support shaft, and the handle. . The vacuum pump according to claim 1, wherein the acceleration sensor has a response sensitivity of 1 to 5 G. An air conditioner construction method for installing an air conditioner configured by connecting both an indoor unit and an outdoor unit with a connecting pipe using a vacuum pump, wherein the vacuum pump is a piston in the upper chamber. The piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and a check valve is disposed at the top dead center position of the upper chamber. And an exhaust port in which a check valve is disposed, and an opening port capable of intake and exhaust in the lower chamber of the cylinder, and formed when the piston is located at a bottom dead center. Formed when the piston is located at the top dead center, and the total volume in the space between the space in the upper chamber 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. The cylinder internal dead The relationship between the pace and the total space volume B from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port is A / B ≧ 40, and the piston is operated downward. After the upper chamber is brought into a negative pressure state, the inside of the indoor unit and the connection pipe are brought into a negative pressure state while guiding the piston to move upward by the intake action from the opening port. The construction method of the air conditioner. An air conditioner construction method for installing an air conditioner configured by connecting both an indoor unit and an outdoor unit with a connection pipe using a vacuum pump, wherein a specific gas is supplied to the indoor unit during installation work. And the air in the indoor unit and the connection pipe is replaced with the specific gas, and the vacuum pump is divided into an upper chamber and a lower chamber by a piston in the cylinder, and the piston is It is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and has an intake port and an exhaust port for disposing a check valve at a top dead center position of the upper chamber, The lower chamber of the cylinder has an opening port capable of intake and exhaust, and the upper chamber space volume formed when the piston is located at the bottom dead center and the check valve for the intake port and the exhaust from the cylinder outlet Reverse for port A total internal volume volume of the internal volume up to the valve, the internal dead space formed when the piston is located at the top dead center, and the intake port check valve and the exhaust port from the cylinder outlet The relationship between the total volume in the space up to the check valve for the vehicle is Ex / B ≧ 20, and after the upper chamber is brought into a negative pressure state by operating the piston downward, the intake air from the opening port The construction method of the air conditioner characterized by making the said indoor unit and the inside of the said connection piping into a negative-pressure state, guide | inducing that the said piston moves upward by an effect | action. An air conditioner construction method for installing an air conditioner configured by connecting both an indoor unit and an outdoor unit with a connection pipe using a vacuum pump, wherein the cylinder is a piston and the upper chamber The piston is divided into a lower chamber, the piston is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and a check valve is disposed at a top dead center position of the upper chamber. The upper port formed when the piston is located at the bottom dead center, and has an intake port and an exhaust port for disposing a check valve; It is formed when the piston is located at the top dead center, and the total volume of the interior space of the interior space volume and the interior volume of the space from the cylinder outlet to the intake port check valve and the exhaust port check valve. Dead inside the cylinder And the relationship between the total space volume B from the cylinder outlet to the check valve for the intake port and the check valve for the exhaust port is A / B ≧ 40, and the piston is located at the top dead center in the cylinder. After the position or the lower chamber is disposed at a position having a predetermined volume in the space, the opening port is blocked by a jig, and the piston is operated downward from the state where the lower chamber is a sealed space. After the upper chamber is brought into a negative pressure state, the indoor unit and the inside of the connection pipe are brought into a negative pressure state while guiding the piston to move upward due to a reaction against air compression into the lower chamber. The construction method of the air conditioner characterized by this. An air conditioner construction method for installing an air conditioner configured by connecting both an indoor unit and an outdoor unit with a connection pipe using a vacuum pump, wherein a specific gas is supplied to the indoor unit during installation work. And the air in the indoor unit and the connection pipe is replaced with the specific gas, and the vacuum pump is divided into an upper chamber and a lower chamber by a piston in the cylinder, and the piston is It is connected to a handle for operating the piston via a support shaft disposed on the upper chamber side, and has an intake port and an exhaust port for disposing a check valve at a top dead center position of the upper chamber, The lower chamber of the cylinder has an opening port capable of intake and exhaust, and the upper chamber space volume formed when the piston is located at the bottom dead center and the check valve for the intake port and the exhaust from the cylinder outlet Reverse for port A total internal volume volume of the internal volume up to the valve, the internal dead space formed when the piston is located at the top dead center, and the intake port check valve and the exhaust port from the cylinder outlet The relationship between the total space volume B to the check valve for the vehicle is A / B ≧ 20, and after the piston is placed at the top dead center position in the cylinder or the position where the lower chamber has a predetermined space volume From the state where the opening port is blocked with a jig and the lower chamber is a sealed space, the piston is operated downward to bring the upper chamber into a negative pressure state, and then the air compression into the lower chamber is prevented. The construction method of the air conditioner characterized by making the said indoor unit and the inside of the said connection piping into a negative pressure state, guiding | inducing that the said piston moves upwards by reaction. 14. The construction method for an air conditioner according to claim 11 or 13, wherein any one or more of carbon dioxide, nitrogen gas, hydrocarbon gas, and argon gas is used as the specific gas.

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