JP2018009454A - Mobile-type vacuum pump equipped with degree-of-vacuum sensing device, manufacturing method thereof, and vacuum checking method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable mobile-type vacuum pump equipped with a degree-of-vacuum sensing device that allows a degree of vacuum of an object instrument as a result of vacuum drawing to be visually recognized easily and accurately even on an exhaust port side of the vacuum pump.SOLUTION: A mobile-type vacuum pump equipped with a degree-of-vacuum sensing device is a mobile-type vacuum pump equipped with a degree-of-vacuum sensing device that includes: a gas detection container into which liquid is injected to increase reliability of a degree of vacuum using exhaust gas in a vacuum pump having a suction port and an exhaust port; and a ventilation pipe, one end of which is connected to the exhaust port in an air tight manner, and the other end of which is inserted into the liquid of the gas detection container. The gas sucked through the suction port is discharged through the exhaust port, and, passing through the ventilation pipe, is evacuated in the liquid of the gas detection container. The generated exhaust gas bubbles can be visually checked.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a portable vacuum pump with a vacuum degree sensing device, a method of manufacturing the same from a conventional vacuum pump, and a vacuum confirmation method using the portable vacuum pump with a vacuum degree sensing device.

  As shown in FIG. 7, an air conditioner or an air conditioner (hereinafter referred to as “air conditioner”) generally has an indoor unit 200 and an outdoor unit 202 reciprocally connected by two pipes 204a and 204b. Construction work is performed so that only the refrigerant gas and compressor oil (internally filled) circulate. Therefore, when installing the air conditioner, an air purge process for expelling air from the pipes 204a and 204b and a vacuum drying process for drying the pipes are required as a pre-process for injecting the refrigerant gas into the pipes 204a and 204b. .

  If air is mixed into the pipes 204a and 204b from the outside of the pipe (hereinafter referred to as “gas leakage”), the air conditioning efficiency of the air conditioner is reduced, and eventually it cannot be used as an air conditioner at all. Therefore, a vacuum confirmation operation for confirming whether or not the inside of the pipes 204a and 204b is completely evacuated in the air purge and vacuum drying process is important.

  The indoor unit 200 and the outdoor unit 202 may be separated from each other by 10 m or more even when an air conditioner is installed in a general home, and it is necessary to weld and connect several pipes to pipes 204a and 204b respectively. Careful welding, piping work and careful vacuum check work are required to completely prevent gas leakage.

  As shown in FIG. 7, the air purge and the vacuum drying process are usually performed by so-called “evacuation” in which the vacuum pump 101 is connected to 204a or 204b of the outdoor unit 202 and the air in the pipes 204a and 204b is extracted. Hereinafter, the air purge and the vacuum drying process are referred to as “vacuum evacuation” which is a common term.

  Although there are various types of vacuum pumps, the most easily used portable oil rotary vacuum pump 101 is, as shown in FIGS. 8 and 9, a motor chamber 105 in which a motor 106 is installed, an intake port 111, A rotor 100 that rotates in conjunction with the motor 106 is housed in the suction chamber 110 in a main body 100 having an exhaust passage 113 and a suction chamber 110 filled with lubricating oil. The suction chamber 110 is filled with lubricating oil 122 so that the rotor 112 can rotate smoothly while maintaining airtightness with the inner wall of the air passage and the like that is in contact with the suction chamber 110. In order to replenish this to a predetermined amount. The lubricating oil supply cylinder 120 is erected on the suction chamber 110. The oil supply port 114 of the lubricating oil supply cylinder 120 is opened and closed by a lid 121, but the cover 121 does not completely seal the oil supply port 114, for example, gas such as oil or air escapes from a slight gap with the oil supply port 114. A large number of oil rotary vacuum pumps 101 in which this gap serves as an exhaust path 113 are commercially available. In addition, a stop valve 144 provided at the intake port 111 is attached in order to block gas from entering and exiting the suction chamber 110. In the present specification, for the sake of convenience, the present invention will be described below using an oil rotary vacuum pump, and the oil rotary vacuum pump is also simply referred to as a “vacuum pump”.

  In the evacuation step, the gas sucked into the suction chamber 110 from the suction port 111 is discharged from the exhaust path 113 by the rotor 112 rotating in the suction chamber 110 as shown in FIG. However, as described above, in the conventional oil rotary vacuum pump 101, the lubricating oil supply cylinder 120 as described above also serves as the exhaust path 113, and other small holes or gaps of the suction chamber 110 include the exhaust path. A model that functions as 113 and the exhaust path 113 is attached to the suction chamber 110 as an obvious exhaust port is not found in the market.

  In the vacuum confirmation work, when vacuuming the air conditioner with such a vacuum pump 101, conventionally, as shown in FIG. 7, a vacuum gauge 130 is inserted between the pipe 204a or 204b and the intake port 111. This is done by connecting the hoses 141 and 142 and checking the pressure in the pipe 204a or 204b with the vacuum gauge 130. However, since the pressure in the pipe 204a or 204b can vary greatly from 0 atm to a maximum of about 30 atm, the check valve 133 (see FIG. 8) attached to the outdoor unit 202, the vacuum pump 101, etc. If the procedure is mistaken, the vacuum gauge 130 is seriously damaged. Even in the analog type, the expensive vacuum gauge 130 frequently fails.

  Also, the piping 204a, 204b used for the air conditioner is required to have a high degree of vacuum. For example, in the case of construction work, the air conditioner piping work is performed at an early stage. Even if a gas leak from the hole is discovered later, detection of the gas leak pinhole position becomes very difficult. Due to this gas leak from the pinhole, the soot refrigerant gas confined at high pressure in the air conditioner system including the pipes 204a and 204b slowly leaks to the outside world, and the air conditioning becomes ineffective after a long period of about one year, for example. The existence of a pinhole is discovered for the first time. Therefore, the vacuum confirmation operation in the evacuation process before entering the building process after the air-conditioner piping construction is performed very carefully, and slight gas leakage is not allowed.

  As described above, in the atmospheric pressure measurement using the analog vacuum gauge 130, which is expensive but frequently fails, it is practically impossible to determine whether the needle points to strict 0 atmosphere. It is virtually impossible to stably detect a slight gas leak. For this reason, in the vacuum confirmation using the vacuum gauge 130 attached to the intake port 111 side, there are many site workers who feel uneasy when the reliability is insufficient.

  As described above, conventionally, in the vacuum confirmation work in vacuuming, when vacuuming a target device (such as an air conditioner), a vacuum gauge 130 is used to determine the degree of vacuum on the suction port side of the vacuum pump 101 connected to the target device. However, it did not guarantee a high degree of vacuum.

  On the other hand, on the exhaust port side of the vacuum pump 101, a vacuum confirmation method for confirming exhaust bubbles by directly passing exhaust gas through a liquid such as water stored in a container, and easily confirming the vacuuming state of the vacuum pump 101 visually Has been used in the past, and more stable and highly accurate confirmation of the degree of vacuum can be expected than using a vacuum gauge. However, since the conventional vacuum pump 101 is not attached to the suction chamber 110 as an obvious exhaust port as described above, it is difficult to collect the exhaust. Furthermore, it is very inconvenient to carry the above water storage container separately from the vacuum pump 101, particularly at the site of installing an air conditioner such as a large building or a high-rise building.

  Therefore, the present invention proposes a portable vacuum pump with a portable vacuum degree sensing device that can easily and accurately confirm the degree of vacuum of the target device as a result of evacuation even on the exhaust port side of the vacuum pump.

The portable vacuum pump with a vacuum degree sensing device according to the present invention is a vacuum pump having an intake port and an exhaust port, wherein a gas detection container into which a liquid is injected, one end of which is airtightly connected to the exhaust port, and the other end A portable vacuum pump equipped with a vacuum degree sensing device including a vent pipe inserted into the liquid in the gas detection container,
The gas sucked from the intake port is exhausted from the exhaust port, and the exhaust bubbles generated by being exhausted in the liquid of the gas detection container through the vent pipe can be visually confirmed.

The portable vacuum pump with a vacuum degree sensing device according to the present invention has a motor chamber in which a motor is installed, a main body having an intake port and an exhaust path, and a suction chamber filled with lubricating oil, in conjunction with the motor. In the vacuum pump in which the rotating rotor is housed in the suction chamber, and the gas sucked from the suction port into the suction chamber is discharged from the exhaust path by the rotor rotating in the suction chamber.
An exhaust port provided in the suction chamber in which the exhaust path is sealed, a gas detection container into which liquid is injected, and an exhaust port that is airtightly connected to the exhaust port and inserted into the liquid injected into the gas detection container. A vent pipe,
A vacuum degree sensing device including a portable vacuum pump attached to the main body,
The gas sucked into the suction chamber from the intake port and discharged from the exhaust port by the rotor rotating in the suction chamber is exhausted in the form of bubbles in the liquid of the gas detection container through the vent pipe. The gas sucked into the suction chamber can be visually confirmed.

  In the portable vacuum pump with a vacuum degree sensing device according to the present invention, a check valve is preferably attached to the vent pipe.

In the portable vacuum pump with a vacuum degree sensing device according to the present invention, an adapter having a bottom surface and an upper portion and a first ventilation port and a second ventilation port is inserted between the exhaust port and the gas detection container. In the portable vacuum pump, the adapter is configured such that the gas detection container is airtightly connected to the first vent hole, the exhaust port is connected to the second vent hole, and the first vent pipe and the second vent pipe, respectively. And
In the portable vacuum pump placed horizontally, the first vent pipe passes through the first vent hole and is inserted to a position directly above the bottom surface of the adapter, and the second vent pipe is disposed in the gas detection container. Is inserted through the second vent so that the liquid is located above the level of water that has flowed back to the adapter through the first vent pipe, and the adapter and the gas detection container are inserted into the main body. It may be attached to.

The portable vacuum pump with a vacuum degree sensing device according to the present invention is the portable type in which a suction pipe having an upper end port is erected on the upper surface of the suction chamber, and the suction port is provided on a side portion of the suction pipe. A vacuum pump,
You may include the pressure meter attached to the upper end port of the said suction pipe, and the stop valve attached to the side part of the said suction pipe so that it may be located under the said inlet port.

A method for manufacturing a portable vacuum pump with a vacuum degree sensing device according to the present invention is as follows.
(1) preparing a conventional portable vacuum pump;
(2) preparing a gas detection container filled with a liquid;
(3) preparing a vent pipe having one end and the other end;
(4) completely blocking the exhaust path of the conventional portable vacuum pump;
(5) a step of standing and forming an exhaust port in the conventional portable vacuum pump;
(6) attaching an opening / closing lid capable of completely sealing the oil filler port of the conventional portable vacuum pump;
(7) connecting one end of the vent pipe in an airtight manner with the exhaust port;
(8) inserting the other end of the vent pipe into the liquid injected into the gas detection container;
including.

The vacuum confirmation method according to the present invention is:
(1) preparing a portable vacuum pump with a vacuum degree sensing device;
(2) a step of airtightly connecting the intake port to the piping of the target device to be evacuated;
(3) activating the motor to evacuate the target device;
(4) a step of confirming exhaust bubbles generated in the liquid in the gas detection container;
including.

  The portable vacuum pump with a vacuum degree sensing device according to the present invention attaches the sucked gas in the target device to the exhaust port side of the vacuum pump when evacuating by connecting to the piping of the target device such as an air conditioner. This can be confirmed by a vacuum sensor. This vacuum sensor is a simple transparent container with a liquid such as water. By visually checking the exhaust bubbles generated in the liquid in the transparent container, it is reliable, easy and reliable. The degree of vacuum in the target device can be confirmed. That is, the portable vacuum pump with a vacuum degree sensing device of the present invention can check the degree of vacuum in the target device on the exhaust port side in addition to the gauge attached to the suction port side of the vacuum pump.

  As mentioned above, the gas leak from the pinhole is suspected to exist only after the air conditioning of the air conditioner is not effective after a long period of time, for example, about one year, but the pinhole of the pipe embedded in the wall of the building It is extremely time consuming and difficult to detect. In the portable vacuum pump with the vacuum degree sensing device of the present invention, the airtight vacuum degree in the pipe and the target device can be more reliable if no exhaust bubbles are generated in the liquid injected into the transparent container of the vacuum degree sensing device. The vacuuming process can be completed with peace of mind.

  If the portable vacuum pump with a vacuum degree sensing device according to the present invention is an oil rotary vacuum pump provided with a rotor, the liquid in the vacuum degree sensing device is prevented from flowing back into the lubricating oil in the suction chamber that houses the rotor. By attaching the adapter to the portable vacuum pump main body, such a back flow of liquid can be easily prevented.

  The vacuum degree sensing device according to the present invention has a simple configuration as described above, and it is only necessary to be able to confirm the exhaust bubbles generated in the liquid in the transparent container. Can be attached to a portable vacuum pump. Also, since the adapter needs only to have a volume that can store the liquid in the vacuum degree sensing device, it can also be easily attached to the portable vacuum pump body. Therefore, the portable vacuum pump with a vacuum degree sensing device according to the present invention can be easily carried in the same manner as a conventional portable vacuum pump.

  In addition, the portable vacuum pump with a vacuum sensor is equipped with a pressure meter at the intake port and integrated into the main body, eliminating the need to carry a vacuum gauge separately from the vacuum pump as in the past, and making the transportation work more convenient. Can be mitigated.

  Such a portable vacuum pump with a vacuum degree sensing device according to the present invention is simply connected to a simple vacuum degree sensing device as described above by sealing the exhaust path of a conventional portable vacuum pump and providing an exhaust port. Thus, it can be easily obtained by modifying a commercial product. In addition, the degree of vacuum of the target device in evacuation can be easily and safely confirmed by directly observing the exhaust bubbles generated in the liquid in the transparent container with one's own eyes.

(A) The perspective view of the main body and gas detection container of the vacuum pump which concerns on this invention, (b) The perspective view of the vacuum pump which concerns on this invention which set the gas detection container in the main body. The cross-sectional schematic diagram of the vacuum pump which concerns on this invention. The perspective view of the vacuum pump of other embodiments concerning the present invention. The cross-sectional schematic diagram of the vacuum pump of other embodiment which concerns on this invention. (A) The perspective view of the main body of the vacuum pump which concerns on an Example, an adapter, and a gas detection container, (b) The perspective view of the vacuum pump which concerns on the Example which attached the adapter and the gas detection container to the main body. (A) The perspective view of the main body and gas detection container of the vacuum pump which concerns on another Example, (b) The perspective view of the vacuum pump which concerns on the other Example which attached the gas detection container to the main body. The flowchart showing the flow of evacuation of the air-conditioner by a vacuum pump. The cross-sectional schematic diagram of the conventional vacuum pump. The perspective view of the conventional vacuum pump.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a portable vacuum pump with a vacuum degree sensing device according to the present invention, a manufacturing method thereof, and a vacuum confirmation method using the same will be described with reference to the drawings. Hereinafter, the same reference numerals are used for the same components throughout the drawings.

[Portable vacuum pump with vacuum sensor]

A portable vacuum pump 1 with a vacuum degree sensing device according to the present invention (hereinafter also simply referred to as “portable vacuum pump” or “vacuum pump” for convenience) includes an inlet 111 and a suction port 111 as shown in FIG. In the vacuum pump 1 having the exhaust port 14, the gas detection container 2 into which the liquid 18 has been injected, and one end of the gas detection container 2 is hermetically connected to the exhaust port 14, and the other end is inserted into the liquid 18 in the gas detection container 2. The portable vacuum pump 1 is equipped with a vacuum degree sensing device 5 including a vent pipe 16. In the portable vacuum pump 1 with a vacuum degree sensing device of the present invention, the gas 50 sucked from the intake port 111 is discharged from the exhaust port 14 and exhausted in the liquid 18 of the gas detection container 2 through the vent pipe 16. The generated exhaust bubbles 51 can be visually confirmed.

[Embodiment 1]

  As described above, the conventional vacuum pump 101 includes a motor chamber 105 in which a motor 106 is installed, a suction chamber 110 having an intake port 111 and an exhaust path 113 and filled with lubricating oil 122, as shown in FIG. A rotor 112 that rotates in conjunction with the motor 106 is housed in a suction chamber 110, and the gas 50 sucked into the suction chamber 110 from the intake port 111 rotates in the suction chamber 110. Thus, the exhaust gas is discharged from the exhaust path 113. However, the vacuum pump 1 of the present embodiment improves the structure of the conventional suction chamber 110 to the suction chamber 11 having a structure in which the exhaust passage 113 is sealed and the exhaust port 14 is newly provided. The sensing device 5 is attached to the improved main body 10.

  That is, in the portable vacuum pump 1 with the vacuum degree sensing device according to the present embodiment, the vacuum degree sensing device 5 includes an exhaust port 14 provided in the suction chamber 11 in which the exhaust path 113 is sealed, as shown in FIG. The gas detection container 2 into which the liquid 18 has been injected, and the vent pipe 16 that is airtightly connected to the exhaust port 14 and inserted into the liquid 18 in the gas detection container 2. In evacuation of piping such as an air conditioner that is a target device, the gas 50 sucked from the suction port 111 of the suction chamber 11 is discharged from the exhaust port 14 by the rotor 112 rotating in the suction chamber 11, and FIG. ), (B), or FIG. 2, the gas is exhausted in the form of bubbles in the liquid 18 of the gas detection container 2 through the vent pipe 16. Therefore, when the portable vacuum pump 1 is used, the gas 50 sucked into the suction chamber 11 is visually confirmed as the exhaust bubble 51 on the exhaust port side in addition to the vacuum gauge 130 provided on the conventional suction port side. can do. In FIGS. 1A and 1B, the reference number of the stop valve 144 attached to the intake port 111 is omitted.

The portable vacuum pump 1 according to the present embodiment is a modification of the conventional vacuum pump 101 shown in FIG. 9 in which the gap between the oil supply port 114 and the lid 121 at the upper end of the lubricating oil supply cylinder 120 is an exhaust path 113. Can be manufactured. The lubricating oil supply cylinder 12 of the portable vacuum pump 1 of the present embodiment can be formed by completely blocking the conventional exhaust path 113 and, for example, an exhaust port 14 standing on its side (FIG. 1). (A), (b)).
The exhaust port 14 is provided with a small hole in the side portion of the lubricating oil supply cylinder 12 as described above so as to be able to ventilate with the intake port 111 through the air passage in the suction chamber 11, and the small size is obtained by welding or the like. What is necessary is just to form a hollow tube upright, for example, covering a hole airtightly. Alternatively, the perforated small hole may be used as the exhaust port 14 and the ventilation pipe 16 may be attached to the exhaust port 14 in an airtight manner.

  Further, in the lubricating oil supply cylinder 12, the oil supply port 114 of the lubricating oil supply cylinder 12 for exchanging or replenishing the lubricating oil 122 is opened and closed with a rubber stopper or the like so that it can be completely sealed, In the suction chamber 11, the gas supply port 114 is completely sealed so that all the gas 50 sucked from the intake port 111 is exhausted from the exhaust port 14, and the gas 50 does not leak without a slight gap. Airtight.

  The ventilation pipe 16 is airtightly connected to the exhaust port 14 so that the gas 50 discharged from the exhaust port 14 is exhausted into the liquid 18 injected into the gas detection container 2 without leakage. The gas 50 exhausted into the liquid 18 becomes exhaust bubbles 51 and rises in the liquid 18. The liquid 18 is preferably water.

The portable vacuum pump 1 with a vacuum degree sensing device according to this embodiment configured as described above has a configuration in which the main body 10 and the gas detection container 2 are connected by a vent pipe 16 as shown in FIG. However, it is convenient to carry the gas detection container 2 on the attachment means 2 ′ such as a hook provided on the surface of the main body 10 and mounted as shown in FIG. Alternatively, the gas detection container 2 may be integrated by welding to the main body 10 directly.

[Vacuum confirmation method]

  As described above, the portable vacuum pump 1 having the gas detection container 2 attached to the main body 10 can be easily carried in a large building or an air conditioner installation site such as a high-rise building as described above. Convenient. And in the vacuuming operation | work of object apparatuses, such as an air-conditioner, it can be used in the following procedures and a vacuum check can be performed.

That is, the vacuum confirmation method using the portable vacuum pump 1 with a vacuum degree sensing device according to the present invention is:
(1) preparing a portable vacuum pump 1 with a vacuum degree sensing device according to the present invention;
(2) a step of airtightly connecting the intake port 111 to a pipe of a target device to be evacuated with a hose or the like;
(3) activating the motor 106 to evacuate the target device;
(4) a step of confirming the exhaust bubbles 51 generated in the liquid 18 in the gas detection container 2;
including.

According to the vacuum confirmation method according to the present invention as described above, the gas sucked from the device to be evacuated on the exhaust port side of the portable vacuum pump 1 with a vacuum degree sensing device can be directly seen by the user as the exhaust bubble 51. Since it can be confirmed, the degree of vacuum of the target device can be confirmed with great peace of mind.

[Manufacturing method of portable vacuum pump with vacuum sensor]

As described above, the portable vacuum pump 1 with the vacuum degree sensing device according to the present embodiment can be obtained by modifying the conventional vacuum pump 101 by the following process. That is, the manufacturing method of the portable vacuum pump with a vacuum degree sensing device according to the present invention is as follows.
(1) preparing a conventional portable vacuum pump 101, a gas detection container 2 filled with a liquid 18, and a vent pipe 16,
(2) completely blocking the exhaust passage 113;
(3) a step of erecting the exhaust port 14 on the side of the lubricating oil supply cylinder 12 or the like;
(4) A step of attaching an opening / closing lid 20 capable of completely sealing the oil supply port 114 of the lubricating oil supply cylinder 12;
(5) connecting one end of the vent pipe 16 to the exhaust port 14 in an airtight manner;
(6) inserting the other end of the vent pipe 16 into the liquid 18 injected into the gas detection container 2;
including.

In the present embodiment, the case where the conventional vacuum pump 101 is modified to manufacture the portable vacuum pump 1 with a vacuum degree sensing device has been described. However, the design is changed from the conventional one and the main body 10 having the above structure is used. The portable vacuum pump 1 with a vacuum degree sensing device of the present invention having a configuration in which the gas detection container 2 is connected by the vent pipe 16 may be directly designed and newly manufactured.

[Embodiment 2]

  For example, when vacuuming an air conditioner using the portable vacuum pump 1 with a vacuum degree sensing device according to the present invention, as described above, the suction port 111 of the portable vacuum pump 1 is set as shown in FIG. The hose 141 is airtightly connected to the pipe 204a or the pipe 204b of the outdoor unit 202. When operating the air conditioner, in order to seal the refrigerant gas such as Freon 410A in the pipes 204a and 204b, the valves attached to the ends of the pipes 204a and 204b are closed to prevent the refrigerant gas and air from entering and leaving. ing. When evacuating, this valve is opened, one end of the hose 141 is connected to the pipe 204 a or the pipe 204 b, and the other end of the hose 141 is connected to the suction port 111.

  In order to stop vacuuming after the vacuum check is completed and the motor of the portable vacuum pump 1 is stopped, the valve must be closed to prevent the liquid 18 in the gas detection container 2 from backflowing. However, if the valve is not closed due to unfamiliarity or carelessness, the liquid 18 flows backward through the vent pipe 16 and is mixed into the lubricating oil 122 in the suction chamber 11. In such a case, the lubricating oil 122 needs to be totally replaced.

  Therefore, in the portable vacuum pump 1 with a vacuum degree sensing device according to the second embodiment, as shown in FIG. 4, the first ventilation port 31 and the second ventilation port are provided between the exhaust port 14 and the gas detection container 2 in the upper part. An adapter 30 having a vent 32 and a bottom surface 33 is inserted to prevent the liquid 18 from flowing back to the suction chamber 11.

  That is, in the portable vacuum pump 1 with the vacuum degree sensing device according to the second embodiment, the adapter 30 shown in FIGS. 3 and 4 includes the gas detection container 2 as the first vent 31 and the exhaust port 14 as the second vent. The opening 32 is airtightly connected by the first vent pipe 16 and the second vent pipe 17, respectively. With the portable vacuum pump 1 placed horizontally, the first vent pipe 16 passes through the first vent 31 and is inserted to the position just above the bottom face 33 of the adapter 30 and is evacuated from the pipes 204a, 204b, etc. Foreign matter such as dust deposited on 33 is discharged into the liquid of the gas detection container 2 together with gas (gas), and the adapter 30 is kept clean. On the other hand, the second vent pipe 17 is also in a state where the portable vacuum pump 1 is horizontally placed in the same manner as the water level in which the liquid in the gas detection container 2 has all flowed back to the adapter 30 via the first vent pipe 16. It is inserted through the second ventilation port 32 so as to be positioned above, and the backflow to the exhaust port 14 is prevented.

As described above, also in the portable vacuum pump 1 with the vacuum degree sensing device according to the second embodiment in which the backflow prevention process is performed by inserting the adapter 30, the gas detection container 2 and the adapter 30 are connected to the portable vacuum pump. It is preferable that it is attached to the main body 10 of 1 to facilitate carrying. These attachments may be integrated by welding, may be integrated at the design and manufacturing stage, or the gas detection container 2 and the adapter 30 are configured to be detachable by providing the main body 10 with the attaching / detaching means 2 '. The mounting means is not particularly limited. Instead of inserting the adapter 30, a check valve 132 may be attached to the vent pipe 16 that connects the exhaust port 14 and the gas detection container 2 as shown in FIG. 2.

  A portable vacuum pump 1 with a vacuum degree sensing device according to Example 1 has the same configuration as the portable vacuum pump 1 according to Embodiment 2 shown in FIGS. 3 and 4. A lubricating oil supply cylinder 120 of a conventional portable oil rotary vacuum pump 101 (see FIGS. 8 and 9) is covered, and a hollow support cylinder 13 is provided above the suction chamber 110 as shown in FIGS. 5 (a) and 5 (b). Is set up. That is, a structure in which the lower end portion of the hollow support cylinder 13 is strictly welded to the upper surface of the suction chamber 110 or the like so as not to leak gas, and the lubricating oil supply cylinder 120 is provided on the conventional suction chamber 110 (FIGS. 8 and 9). (Refer to FIG. 5A and FIG. 5B). Therefore, the exhaust passage 113 which is a gap between the lubricating oil supply cylinder 120 and the lid 121 provided in the conventional oil rotary vacuum pump 101 has a completely closed structure.

  In the portable vacuum pump 1 with a vacuum degree sensing device according to the first embodiment, an exhaust port 14 is erected on the side of the hollow support cylinder 13 with a drill, and vent pipes 17 and 16 are used for the exhaust port 14. Thus, the adapter 30 and the gas detection container 2 were connected while maintaining airtightness (see FIG. 5A). And these adapter 30 and the gas detection container 2 were welded and fixed to the side part of the hollow support cylinder 13 like FIG.5 (b).

Such a portable vacuum pump 1 with a vacuum degree sensing device according to the first embodiment can prevent the liquid 18 in the gas detection container 2 from flowing back into the suction chamber 11 by the adapter 30. The adapter 30 and the gas detection container 2 can be easily attached to the side portion of the hollow support tube 13 by welding or the like. For this reason, the degree of vacuum in the target device can be confirmed with confidence by visually observing the exhaust bubbles generated in the liquid 18 in the gas detection container 2, and can be easily carried in the same manner as a conventional portable vacuum pump. can do.

  The portable vacuum pump 1 with a vacuum degree sensing device according to the second embodiment has the same configuration as the portable vacuum pump 1 according to the first embodiment shown in FIGS. 1 (a), 1 (b) and FIG. In the portable vacuum pump 1 according to the second embodiment shown in FIG. 6, a check valve 132 is provided in the vent pipe 16 of the portable vacuum pump 1 according to the first embodiment (see FIGS. 1A and 1B). To prevent the liquid 18 from flowing backward.

  In addition, unlike the suction port 111 (see FIGS. 1A and 1B) of the portable vacuum pump 1 according to the first embodiment, a suction pipe 42 is erected in the vertical direction on the upper surface of the suction chamber 11 to perform suction. A pressure meter 46 was attached to the upper end of the pipe 42, and an intake 40 was provided on the side of the suction pipe 42. Similarly, a stop valve 44 is attached to the side of the suction pipe 42 so as to be positioned below the intake port 40. When the stop valve 44 is closed during evacuation of a target device such as an air conditioner, the pressure meter 46 The degree of vacuum of the target device can be roughly determined.

  Thus, since the portable vacuum pump 1 with a vacuum degree sensing device according to the second embodiment is integrated with the main body 10 by attaching the pressure meter 46 to the intake port 40, the vacuum gauge 130 is integrated with the vacuum pump as in the prior art. Apart from this, it is not necessary to carry around, and the transportation work can be reduced.

  The portable vacuum pump with a vacuum degree sensing device according to the present invention has been described above, but the present invention is not limited to the above-described embodiments and examples. For convenience, the vacuum pump has been described as an oil rotary vacuum pump in the above description. However, the type of the vacuum pump is not particularly limited as long as the vacuum pump is provided with an intake port and an exhaust port to perform vacuuming. Further, in the portable vacuum pump with a vacuum degree sensing device according to the present invention, the exhaust port is erected on the side of the lubricating oil supply cylinder, but the position where the exhaust port is erected or drilled is not particularly limited. Further, the material, material, type, etc. of the gas detection container, the vent pipe, the adapter, and the liquid constituting the vacuum degree sensing device are not particularly limited.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

  The vacuum pump of the present invention can be used for evacuation processing of an apparatus that needs to be highly evacuated, such as an air conditioner, an air conditioner, and a laboratory instrument.

1: Vacuum pump 2 according to the present invention: Gas detection container 2 ′: Mounting means 5: Vacuum degree sensing device 10, 100: Main body 11, 110: Suction chamber 12, 120: Lubricating oil supply cylinder 13: Hollow support cylinder 14: Exhaust port 16: Vent pipe (first vent pipe)
17: Second vent pipe 18: Liquid 20: Opening / closing lid 30: Adapter 31: First vent 32: Second vent 33: Bottom 40, 111: Inlet 42: Suction pipe 44, 144: Stop valve 46: Pressure Meter 50: Gas 51: Exhaust bubble 101: Conventional vacuum pump 105: Motor chamber 106: Motor 112: Rotor 113: Exhaust path 114: Oil supply port 120: Lubricating oil supply cylinder 121: Lid 122: Lubricating oil 130: Vacuum gauge 132 133: Check valves 141, 142: Hose 200: Indoor unit 202: Outdoor units 204a, 204b: Piping

Claims (7)

In a vacuum pump having an intake port and an exhaust port,
A gas detection container filled with liquid;
A vent pipe having one end hermetically connected to the exhaust port and the other end inserted into the liquid in the gas detection container;
A portable vacuum pump equipped with a vacuum degree sensing device including
A portable device with a vacuum degree sensing device capable of visually confirming the exhaust bubbles generated when the gas sucked from the intake port is exhausted from the exhaust port and exhausted in the liquid of the gas detection container through the vent pipe. Type vacuum pump. A rotor that rotates in conjunction with the motor is housed in the suction chamber in a main body having a motor chamber in which a motor is installed, an intake port and an exhaust path, and a suction chamber filled with lubricating oil. In the vacuum pump in which the gas sucked into the suction chamber from the intake port is discharged from the exhaust path by the rotor rotating in the suction chamber.
An exhaust port provided in the suction chamber in which the exhaust path is sealed;
A gas detection container filled with liquid;
A vent pipe that is airtightly connected to the exhaust port and inserted into the liquid injected into the gas detection container;
A vacuum degree sensing device including a portable vacuum pump attached to the main body,
The gas sucked into the suction chamber from the intake port and discharged from the exhaust port by the rotor rotating in the suction chamber is exhausted in the form of bubbles in the liquid of the gas detection container through the vent pipe. ,
A portable vacuum pump with a vacuum degree sensing device capable of visually confirming the gas sucked into the suction chamber. The portable vacuum pump with a vacuum degree sensing device according to claim 1 or 2, wherein a check valve is attached to the vent pipe. 3. The portable vacuum pump according to claim 1, wherein an adapter having a bottom surface and an upper portion having a first ventilation port and a second ventilation port is inserted between the exhaust port and the gas detection container. There,
In the adapter, the gas detection container is airtightly connected to the first vent hole, the exhaust port is connected to the second vent hole, and the first vent pipe and the second vent pipe, respectively.
In the portable vacuum pump placed horizontally,
The first vent pipe passes through the first vent hole and is inserted to just above the bottom surface of the adapter;
The second vent pipe is inserted through the second vent so that the liquid in the gas detection container is positioned above the water level where all the liquid in the gas detection container flows back to the adapter via the first vent pipe. And
A portable vacuum pump with a vacuum degree sensing device, wherein the adapter is mounted on the main body together with the gas detection container. The portable vacuum pump according to claim 2, wherein a suction pipe having an upper end is erected on an upper surface of the suction chamber, and the suction port is provided on a side portion of the suction pipe.
A pressure meter attached to the upper end of the suction pipe;
A stop valve attached to a side of the suction pipe so as to be positioned below the intake port;
A portable vacuum pump with a vacuum degree sensing device. Preparing a conventional portable vacuum pump;
Preparing a gas detection container filled with liquid;
Providing a vent tube having one end and another end;
Completely blocking the exhaust path of the conventional portable vacuum pump;
Forming the exhaust port upright on the conventional portable vacuum pump; and
Attaching an open / close lid capable of completely sealing an oil filler port of the conventional portable vacuum pump;
Connecting one end of the vent pipe in an airtight manner with the exhaust port;
Inserting the other end of the vent pipe into the liquid injected into the gas detection container;
A method for manufacturing a portable vacuum pump with a vacuum degree sensing device. Preparing a portable vacuum pump with a vacuum degree sensing device according to claim 1;
A step of airtightly connecting the intake port to the piping of the target device to be evacuated;
Evacuating the target device by operating the motor; and
A step of confirming exhaust bubbles generated in the liquid in the gas detection container;
Including a vacuum confirmation method.

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