JP2007211700A - Ejector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejector having chemical substance resistance and water resistance, which is manufactured at a low cost and maintaining high accuracy even under an environment where significant temperature change and vibration are generated. <P>SOLUTION: A main body of the ejector consists of a body B in which a plurality of nozzles 6 to 9 are serially incorporated at intervals and a cover C for covering the body B. The main body has openings including a supply passage 13 for supplying compressed air, an exhaust passage 14 for exhausting the supplied air and a sucking passage 15 for connecting a sucking means for sucking a chamber or a work which should be vacuumed. In the ejector, the body B is made of resin and expansion inhibition members 21, 22 for inhibiting expansion and contraction of the body B is provided along a longitudinal direction of the nozzles 6 to 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ejector that is most suitable for use in, for example, a filth suction mechanism for a toilet installed in a vehicle or an airplane.

Conventionally known ejectors shown in FIG. 3 and FIG. 4 are known as vacuum pressure generators.
The ejector E shown in FIGS. 3 and 4 includes a metal body B and a pressurized gas chamber 1, a first decompression chamber 2, a second decompression chamber 3, a third decompression chamber 4, and an exhaust chamber 5. Are adjacent to each other. A first nozzle 6 is provided in the partition between the pressurized gas chamber 1 and the first decompression chamber 2, and a second nozzle 7 is provided in the partition between the first decompression chamber 2 and the second decompression chamber 3. The third nozzle 8 is provided in the partition between the second decompression chamber 3 and the third decompression chamber 4, and the fourth nozzle 9 is provided in the partition between the third decompression chamber 4 and the exhaust chamber 5. ing. The nozzles 6 to 9 are provided in series with the same axis line, and the inner diameters of the first nozzle 6 to the fourth nozzle 9 are sequentially increased from the first nozzle 6 to the fourth nozzle 9. In addition, a predetermined interval is provided between these nozzles 6-9.

As shown in FIG. 4, the cover C includes a gas supply chamber 10 that leads to the pressurized gas chamber 1, a suction chamber 11 that leads to the first decompression chamber 2 to the third decompression chamber 4, and an exhaust chamber 5. The cover-side exhaust chamber 12 communicated with each other is adjacent to each other via a partition wall. Further, a supply passage 13 that opens the gas supply chamber 10 to the outside, a suction passage 14 that opens the suction chamber 11 to the outside, and an exhaust passage 15 that opens the cover side exhaust chamber 12 to the outside are formed on the surface of the cover C. ing.
Such body B and cover C overlap with each other via a seal member (not shown), and the overlapped body B and cover C are connected by a connecting means such as a bolt to form a main body. ing.
Further, the suction chamber 11 and the first decompression chamber 2 are always in communication with each other via the communication hole X, and a first check valve 16 is provided in a communication portion (communication hole Y) between the second decompression chamber 3 and the suction chamber 11. The second check valve 17 is provided at the communication portion (communication hole Z) between the third decompression chamber 4 and the suction chamber 11. The first and second check valves 16 and 17 allow only the flow from the suction chamber 11 to the decompression chambers 3 and 4.

  In the ejector apparatus configured as described above, a pump is connected to the supply passage 13 via a pipe (not shown), and pressurized gas supplied from the pump is supplied to the gas supply chamber 10. Then, the pressurized gas supplied to the gas supply chamber 10 passes through the gas supply chamber 10 → the pressurized gas chamber 1 → the first nozzle 6 and is ejected toward the second nozzle 7. The air ejected from the first nozzle 6 draws the air in the first decompression chamber 2 and flows into the second nozzle 7, and ejects from the second nozzle 7 toward the third nozzle 8. When the gas ejected from the second nozzle 7 flows into the third nozzle 8, the air in the second decompression chamber 3 is drawn. Similarly, when the gas flows from the third nozzle 8 to the fourth nozzle 9, the air in the third decompression chamber 4 is drawn.

As described above, when the pressurized gas is supplied from the supply passage 13, the air in each of the decompression chambers 2 to 4 is drawn and discharged from the exhaust passage 15 to the outside via the exhaust chamber 5 and the cover-side exhaust chamber 12. . As a result, the decompression chambers 2 to 4 are decompressed, but the degree of vacuum is highest in the first decompression chamber 2 and gradually decreases toward the second and third decompression chambers 3 and 4.
When each of the decompression chambers 2 to 4 is decompressed and the vacuum degree of the decompression chambers 3 and 4 becomes higher than the vacuum degree of the suction chamber 11, the first and second check valves 16 and 17 are as shown in FIG. The air flows into the second decompression chamber 3 and the third decompression chamber 4 from the suction chamber 11 through the communication holes Y and Z.
As a result of an increase in resistance on the side of the pipe connected to the suction chamber 11, if the degree of vacuum on the side of the suction chamber 11 becomes higher than the degree of vacuum on the side of the second and third decompression chambers, the first and second check valves 16 and 17 are closed.

  Specifically, a vacuum chamber is connected to the suction passage 14 via a vacuum pipe. In this state, when pressurized gas is supplied to the gas supply chamber 10, the pressurized gas passes through the decompression chambers 2 to 4 and is discharged from the exhaust passage 15. In the initial stage, the degree of vacuum of the vacuum chamber and the suction chamber 11 is not sufficiently increased, so that the pressure of the suction chamber 11 is kept higher than that of the second and third decompression chambers 3 and 4. Therefore, both the check valves 16 and 17 are kept open, and air flows from the suction chamber 11 to the decompression chamber side. When the vacuum degree of the vacuum chamber and the suction chamber 11 is increased and the vacuum degree of the suction chamber 11 becomes higher than the vacuum degree of the third decompression chamber 4, the second check valve 17 is closed, and the suction chamber 11 and the third decompression chamber are closed. 4 is blocked. In the suction chamber 11, air is continuously sucked from the first decompression chamber 2 and the second decompression chamber 3 to further increase the degree of vacuum, and the degree of vacuum in the suction chamber 11 is the degree of vacuum in the second decompression chamber 3. If it becomes higher than this, the first check valve 16 is also closed. Then, the air on the suction chamber 11 side is sucked into the first decompression chamber 2 through the communication hole X. In this way, by sequentially blocking the communication holes of the plurality of decompression chambers, a high degree of vacuum can be realized more quickly.

As described above, if the ejector E is used, the inside of the vacuum chamber connected to the suction passage 14 can be evacuated, or the suction means for attracting the workpiece can be evacuated. It is used for the filth suction mechanism of toilets installed in vehicles and airplanes.
As shown in FIG. 5, toilets installed in vehicles, airplanes, and the like have a waste tank T provided behind the ceiling, but because the space under the floor is very narrow, the tank T is placed under the floor. This is because it cannot be provided. The excrement tank T thus configured is depressurized to a predetermined vacuum pressure by the ejector E, and the open / close valve 20a is closed in the depressurized state to maintain the vacuum state. This excrement tank T is connected to the toilet bowl 19 via a pipe 18, and an open / close valve 20b is provided in the pipe 18 to connect the toilet bowl 19 and the excrement tank T in a normal state. Is shut off. When the on-off valve 20b is temporarily opened by a button operation, the excrement tank T is opened to the atmosphere in the toilet 19, and the excrement of the toilet 19 is drawn into the excretion tank T with the atmosphere. It is.
In such a toilet dirt suction mechanism, since the ejector E maintains the waste tank T in a vacuum state, the waste tank T can be provided behind the ceiling.
Registered Utility Model No. 3022143

As described above, when the metal ejector E is used for the filth suction mechanism of a toilet installed in a vehicle or an airplane, the ejector E may cause a chemical reaction. This is because excrement excreted from the human body is stored in the excrement tank T, but the excrement contains chemical substances composed of various gases or liquids typified by ammonia. is there. Therefore, the ejector E that is connected to the excrement tank T and sucks air from the excretion tank T may be affected by various chemical substances and cause a chemical reaction.
In addition, since the ejector E is made of metal, the main body rusts due to a chemical reaction particularly when moisture enters from the excrement tank T. As described above, when the ejector E is made of metal, there is a problem in terms of chemical resistance and water resistance when the ejector E is used not only in the toilet dirt suction mechanism but also in a place affected by a chemical substance or the like.

Therefore, as described above, in a scene affected by chemical substances and moisture, it is common to use a resin ejector that is superior to metals in chemical substance resistance and water resistance.
However, as shown in FIG. 6, the resin has a higher coefficient of thermal expansion than the metal. For this reason, when a resin ejector is used in an environment where the temperature change is severe, the body B may expand or contract. As described above, when the body B expands or contracts due to a temperature change, a preset required suction flow rate or ultimate vacuum cannot be secured for the following reason. That is, the suction flow rate or the ultimate vacuum in the ejector is determined by the opening diameters of the nozzles facing each other and the interval between the nozzles. However, if the body B expands or contracts due to a temperature change, the opposed spacing of the nozzles is distorted. If the nozzle facing distance deviates from the initial set value, it becomes impossible to secure a necessary suction flow rate or ultimate vacuum that is set in advance.

As described above, if the gap between the nozzles is deviated, it becomes impossible to secure a required suction flow rate or ultimate vacuum that is set in advance, and therefore the resin ejector is used in an environment where the temperature change is small. Can only be used.
However, ejectors installed in vehicles, airplanes, etc. are exposed to severe temperature changes. This is because vehicles, airplanes, and the like reciprocate many times in areas where the temperature difference is severe. In addition, when installing an ejector on a vehicle, airplane, etc., it is not always installed in a well-equipped place with air conditioning equipment, and it is installed adjacent to other equipment that generates heat, etc. Often used in harsh environments. If a resin ejector is used for the filth suction mechanism of toilets such as vehicles and airplanes where the temperature changes drastically, the body B may expand or contract, and the required suction flow rate or ultimate vacuum can be maintained. There is a risk of disappearing.

If a material such as stainless steel that is excellent in water resistance and can withstand temperature changes is used, the above-described problem of expansion can be solved.
However, if the body B of the ejector is made of stainless steel and the decompression chambers 2 to 4 are processed in the stainless steel body, the cost becomes very high.
In addition, stainless steel is limited in chemical substances that can be tolerated compared to resin. In other words, the resin can withstand most chemical substances by selecting the material, but stainless steel has a relatively large number of chemical substances that exhibit a chemical reaction compared to the resin. Therefore, an ejector made of a stainless steel body is inferior to a resin ejector when used in an environment that is affected by chemical substances. In other words, the ejector made of a stainless steel main body has a problem that the use environment is limited.
As described above, when a metal ejector is used for a filth suction mechanism of a toilet such as a vehicle or an airplane which is easily affected by chemical substances or moisture, there are various problems described above. In addition, vehicles, airplanes, and the like are accompanied by severe vibrations, and the use environment of the ejector is very poor. Even in such a severe use environment, there is still no ejector that maintains high accuracy over a long period of time.

  An object of the present invention is to provide an ejector that has chemical resistance and water resistance, can maintain high accuracy even in an environment where severe temperature changes and vibrations occur, and is low in manufacturing cost. .

  In the present invention, a main body is constituted by a body in which a plurality of nozzles are incorporated in series with a space therebetween and a cover for closing the body, and a supply passage for supplying compressed air is supplied to the main body. It is assumed that the ejector is formed by opening an exhaust passage for exhausting air and a suction passage connecting a chamber to be evacuated or a suction means for sucking a workpiece.

On the premise of the above configuration, the first invention is characterized in that the body is made of resin, and an expansion suppressing member for suppressing expansion of the body is provided along the longitudinal direction of the nozzle.
According to a second aspect of the invention, the expansion suppression member is made of a metal plate member, and the metal expansion suppression member is fixed to the outer peripheral surface of the main body in which the opening of the passage is formed. It is characterized in that a pipe mounting screw hole corresponding to the opening is formed.
According to a third aspect of the present invention, any one, two, or all openings of the supply passage, the exhaust passage, and the suction passage are formed larger than the pipe mounting screw hole, and the opening of the passage functions as a pipe screw escape hole. It has the characteristic in the point provided with.
The fourth invention is characterized in that member expansion screw holes for attaching other members and the like are formed in the expansion suppression member made of a metal plate member.

The fifth invention is characterized in that a member attachment screw hole is made to penetrate the expansion restraining member, and a screw escape hole is formed in the main body at a position corresponding to the member attachment screw hole.
According to a sixth aspect of the present invention, the body and the cover are sandwiched between a pair of expansion restraining members, one of the expansion restraining members is formed with a clamping screw hole, and the other expansion inhibiting member corresponds to the clamping screw hole. A screw rod through hole is formed, and a through hole is formed in the body and cover at a position corresponding to the holding screw hole and the screw rod through hole, and the screw rod through hole and the through hole are formed from the outside of the other expansion restraining member. The screw rod is penetrated through the hole, and the screw rod is screwed into the clamping screw hole.

According to the ejectors in the first to sixth inventions, since the body is formed of resin, even if the body is used in an environment affected by chemical substances or moisture, the possibility that the body will cause a chemical reaction is extremely low.
Moreover, since the body is made of resin, it can be manufactured at low cost.
In addition, since the main body is provided with the expansion suppressing member, it is possible to prevent the body from expanding and contracting even in an environment where the temperature changes drastically. Therefore, even when used in an environment where the temperature changes drastically, the gap between the nozzles does not fluctuate, and a predetermined suction flow rate or ultimate vacuum can be secured and a highly accurate ejector function can be maintained.

In particular, according to the second aspect of the invention, the metal expansion restraining member is provided on the outer peripheral surface of the main body, and the screw hole for pipe attachment is formed in the expansion restraining member, so that the expansion restraining member superior in strength to the resin is interposed. The pipe can be firmly attached to the main body. Accordingly, the piping and the like will not come off even in an environment with severe vibration. And since piping is attached to a main body via an expansion | swelling suppression member, when attaching piping, the shape of a main body does not deform | transform. If the pipe is directly attached to the main body, the pipe must be connected to the main body, so that the main body is deformed during this connection. However, if the pipe is attached to the metal expansion restraining member as described above, the main body is not deformed.
According to the third invention, since the opening of the passage is provided with a function as a piping screw escape hole, the size management of the piping attached to the opening is facilitated. Further, the expansion suppressing member does not need to be formed according to the length of the pipe mounting screw. Therefore, the thickness may be set to a minimum necessary for suppressing the expansion of the body, and the cost can be reduced and the installation space can be minimized.

According to the fourth invention, as in the second invention, other members and the like can be firmly attached to the main body, and the shape of the main body is not deformed when the other members and the like are attached.
According to the fifth aspect, since the screw escape hole is formed at a position corresponding to the member mounting screw hole in the main body, it is easy to manage the dimensions of screws and the like used for mounting other members.
According to the sixth invention, since the body and the cover are sandwiched between the pair of expansion restraining members, and the pair of expansion restraining members are fixed to the main body via the screw rod, the expansion suppressing member and the main body are firmly fixed. can do.
In addition, since the pinching screw hole and the screw rod through hole are formed in a metal expansion restraining member, the screw rod can be easily locked using an adhesive, and a vehicle, an airplane, or the like is generated. Screw loosening due to vibration can be prevented. If an adhesive is used for the resin, the choice of the adhesive corresponding to the material of each resin must be selected, and the options become very narrow.

  An embodiment of the present invention will be described with reference to FIGS. The ejector in this embodiment has the greatest features in the expansion suppressing member provided on the outer peripheral surface of the main body and the main body structure for providing the expansion suppressing member, and the other structures are the same as those of the conventional ejector. is there. Therefore, components similar to those of the conventional ejector are denoted by the same reference numerals, and detailed description thereof is omitted.

The ejector shown in FIG. 1 includes a main body including a body B and a cover C, and a pair of expansion suppression members 21 and 22 provided on a surface opposite to the overlapping surface of the body B and the cover C. The body B and the cover C are both made of resin, and the pair of expansion suppression members 21 and 22 are both metal plate members.
And one expansion | swelling suppression member 21 forms the screw hole 23a for pipe attachment in the position corresponding to the opening of the supply path 13 formed in the cover C while overlapping the surface of the cover C which is an outer peripheral surface of a main body. Yes. In addition, pipe mounting screw holes 23 b and 23 c are formed at positions corresponding to the openings of the suction passage 14 and the exhaust passage 15 formed in the cover C. The pipe mounting screw holes 23 a to 23 c are formed to have the same size as the corresponding openings of the supply passage 13, the suction passage 14, and the exhaust passage 15.
The other expansion restraining member 22 is superposed on the surface of the body B which is the outer peripheral surface of the main body.

As shown in FIG. 2, clamping screw holes 24 having female screws are formed at the four corners of one expansion restraining member 21, and the clamping screw holes 24 are formed at the four corners of the other expansion inhibiting member 22. Corresponding screw rod through holes 25 are formed. Further, the cover C and the body B are provided with through holes 26 and 27 corresponding to the clamping screw hole 24 and the screw rod through hole 25.
And while sandwiching the main body which consists of the cover C and the body B between a pair of expansion | swelling suppression members 21 and 22, the screw rod 28 which has a male screw at the front-end | tip is inserted from the screw rod through hole 25, The male screw Is screwed into the clamping screw hole 24. Thus, by screwing with the screw rod 28, a pair of expansion | swelling suppression members 21 and 22 and a main body are press-fixed and fixed. When the screw rod 28 is inserted, an adhesive is applied to the clamping screw hole 24 and the screw rod through hole 25 so that the screw rod 28 is not loosened.

Further, the expansion restraining members 21 and 22 are threaded through member mounting screw holes 29 and 30. The cover C has a screw escape hole 31 that passes through the position corresponding to the member mounting screw hole 29, and the body B has a screw escape hole 32 that passes through the position corresponding to the member mounting screw hole 30. is doing.
The above-mentioned member mounting screw holes 29 and 30 are for mounting other members such as an ejector or a sensor or a meter required according to the installation situation of the ejector or a flange at the time of flange piping. Further, the ejector itself may be attached to a wall or other equipment using the member attaching screw holes 29 and 30. The screw escape holes 31 and 32 are holes for releasing the screw tip so that the tip does not damage the main body when the screw is attached to the member attachment screw holes 29 and 30. Therefore, in this embodiment, the screw escape holes 30 and 31 are provided so as to penetrate therethrough, but the screw escape holes 30 and 31 do not necessarily pass through. Moreover, although the member attachment screw holes 29 and 30 are not located at corresponding positions, as described above, the member attachment screw holes 29 and 30 may be provided at optimum positions according to the scene where other members or the like are attached.
Since the other structure of the main body is the same as that of the conventional ejector, description of the internal structure of the main body is omitted here.

When the ejector of this embodiment having the above-described structure is used, for example, in a filth suction mechanism for a toilet such as a vehicle or an airplane, one end of a vacuum pipe (not shown) is attached to the pipe attachment screw hole 23b. Then, the other end of the vacuum pipe is connected to the excrement tank T. In addition, another pipe is attached to the pipe attachment screw hole 23a, and a main body and a pump (not shown) are connected via this pipe. In this embodiment, the gas is directly opened to the atmosphere without connecting the pipe to the pipe mounting screw hole 23c, but the pipe is connected to the pipe mounting screw hole 23c and ejected from the exhaust passage 15. The gas may be released to the atmosphere where it does not affect other equipment.
In this state, when the pump is driven to supply the pressurized gas into the main body, the pressure in each of the decompression chambers 2 to 4 is reduced and the suction chamber 11 and the suction chamber 11 are operated according to the same principle as that of the conventional ejector. The inside of the excrement tank T communicated with each other via a vacuum pipe can be evacuated.

As described above, since the ejector in this embodiment is formed of a resin having excellent chemical resistance and water resistance, the ejector can be used in an environment affected by chemical substances and moisture. The possibility that the main body will cause a chemical reaction is extremely low.
Moreover, since the main body of the ejector in this embodiment is made of resin, it can be manufactured at a lower cost than a metal ejector.
And even if the main body is made of resin in consideration of chemical resistance and water resistance as described above, the expansion restraining members 21 and 22 are provided on the outer peripheral surface of the main body. Thus, the main body can be prevented from expanding and contracting. In this way, the main body can be prevented from expanding and contracting, so that the gap between the nozzles 6 to 9 does not fluctuate, and even when used in an environment where the temperature changes rapidly, a predetermined suction is performed. High accuracy can be maintained by ensuring the flow rate or ultimate vacuum.

In addition, since the pipe is screwed into the pipe mounting screw holes 23a to 23c formed in the metal expansion restraining members 21 and 22, the ejector and the pipe can be firmly attached. Therefore, even if it is used in an environment with severe vibrations, the piping does not come off from the main body or the shape of the main body is not deformed during installation.
Moreover, since the body B and the cover C are sandwiched between the pair of expansion suppression members 21 and 22 and the pair of expansion suppression members 21 and 22 are fixed to the main body via the screw rods 28, the expansion suppression members 21 and 22 The main body can be firmly fixed.
In addition, since the holding screw hole 24 and the screw rod through hole 25 are formed in the metal expansion restraining members 21 and 22, the screw rod 28 can be easily locked using an adhesive. It is possible to prevent the screw rod 28 from being loosened due to severe vibrations such as those generated by airplanes and the like.
Further, other members and the like can be firmly attached to the member attachment screw holes 29 and 30, and the screw escape holes 31 and 32 are provided in the main body at positions corresponding to the member attachment screw holes 29 and 30. Therefore, it is possible to easily manage the dimensions of screws and the like used for attaching other members. That is, since it is not necessary to make the expansion suppression members 21 and 22 thicker than necessary in order to facilitate the dimensional management of screws and the like, it is possible to suppress an increase in cost due to the formation of unnecessary collection.

The present invention has the greatest feature in that the expansion inhibiting members 21 and 22 prevent the resin body B from expanding and contracting due to temperature changes. Therefore, when attention is paid only to this point, the expansion suppressing members 21 and 22 may not be made of metal. That is, if the material has a lower thermal expansion coefficient than that of the body B, the effect of suppressing the expansion of the body B can be obtained even if it is not made of metal. Therefore, as another embodiment, the expansion suppression member may be a member having a lower coefficient of thermal expansion than the body.
Moreover, in the said embodiment, although the expansion suppression members 21 and 22 consist of one metal board member, as other embodiment, the rod member which divided | segmented the expansion suppression member into the longitudinal direction or the width direction in multiple numbers Alternatively, it may be a plate member. Even in this case, the expansion and contraction of the body B can be suppressed by the expansion suppression member. For example, if an expansion suppression member is provided on the surface of the body B at a position corresponding to the partition wall to which the third nozzle 8 is attached and the partition wall to which the fourth nozzle 9 is attached, The distance between the four nozzles 9 can be kept constant.
The expansion suppressing member may be provided not only on the outer peripheral surface of the main body but between the cover C and the body B, or may be incorporated into the cover C or the body B as an insert part or an outsert part.

Moreover, in the said embodiment, although the screw holes 23a-23c for pipe attachment and the opening of each channel | path 13-15 corresponding to these holes 23a-23c are formed in the same magnitude | size, these are not necessarily the same. It is not necessary to form in size. In other words, the chambers 10 to 12 may be configured to communicate with each other through the pipe, and the openings and the screw holes 23a to 23c may have different sizes. Therefore, the screw holes 23a to 23c for pipe attachment can be formed according to the size of the pipe to be connected.
However, if the openings of the passages 13 to 15 are formed larger than the pipe mounting screw holes 23a to 23c, each opening can be provided with a function as a pipe screw escape hole. Thus, if each opening has a function as a piping screw escape hole, the size management of the piping attached to the opening becomes easy, and the expansion restraining members 21 and 22 are adjusted to the length of the piping mounting screw. No need to form. Therefore, the expansion suppression members 21 and 22 can be formed to a minimum thickness necessary for suppressing the expansion of the body B, and accordingly, the cost can be reduced and the installation space can be minimized. .

Moreover, in the said embodiment, although each channel | path 13-15 was provided in the cover C side, naturally it may be provided in the body B side. In this case, the pipe attachment screw holes 23a to 23c may be provided in the expansion suppressing member 22 provided on the body B side.
In the above embodiment, each of the nozzles 6 to 9 is made of a member different from the body B. However, the nozzle may be integrated with the body B. In any case, any flow rate may be set depending on the size of the opening diameter and the size of the facing interval, and it is natural that the nozzles can be opposed in any number of stages.
Moreover, in the said embodiment, although demonstrated using the ejector which has the check valves 16 and 17, the check valves 16 and 17 are not an essential component. Therefore, it is not necessary to provide the check valves 16 and 17 when a high degree of vacuum is not required.
In the above-described embodiment, the ejector is used for a filth suction mechanism for a toilet installed in a vehicle, an airplane, or the like. Of course not. That is, the same effect can be obtained even when used in a scene that can be affected by chemical substances or moisture, for example, in a chemical test site.

It is side surface sectional drawing which shows the ejector in this embodiment. It is a perspective view which shows the ejector in this embodiment. It is a perspective view which shows the conventional ejector. It is side surface sectional drawing which shows the conventional ejector. It is a conceptual diagram which shows the usage example of the conventional ejector. It is a thermal expansion coefficient comparison table of each member.

Explanation of symbols

6 1st nozzle 7 2nd nozzle 8 3rd nozzle 9 4th nozzle 13 Supply passage 14 Suction passage 15 Exhaust passage 21 One expansion suppression member 22 The other expansion suppression member 23a-c Pipe installation screw hole 24 Clamping screw hole 25 Screw rod through hole 26, 27 Through hole 28 Screw rod 29, 30 Screw hole 31, 32 for member attachment Screw escape hole B Body C Cover

Claims (6)

  A main body is constituted by a body in which a plurality of nozzles are provided in series at intervals, and a cover for closing the body. A supply passage for supplying compressed air and an air supplied to the main body are exhausted to the main body. In an ejector formed by opening an exhaust passage and a suction passage that connects a suction chamber that sucks a chamber or workpiece to be evacuated, the body is made of resin, and an expansion inhibiting member that suppresses expansion and contraction of the body. Is an ejector provided along the longitudinal direction of the nozzle.   The expansion restraining member is made of a metal plate member, and the metallic expansion restraining member is fixed to the outer peripheral surface of the main body in which the opening of the passage is formed, and a pipe corresponding to the opening is attached to the expansion restraining member. The ejector according to claim 1, wherein a screw hole is formed.   3. One or two or all of the supply passage, the exhaust passage, and the suction passage are formed larger than a pipe mounting screw hole, and the opening of the passage has a function as a pipe screw escape hole. The ejector described.   The ejector according to any one of claims 1 to 3, wherein a member mounting screw hole for mounting another member or the like is formed in the expansion suppressing member made of a metal plate member.   5. The ejector according to claim 4, wherein a member mounting screw hole is passed through the expansion suppression member, and a screw escape hole is formed in the main body at a position corresponding to the member mounting screw hole.   The body and cover are sandwiched between a pair of expansion restraining members. One expansion restraining member is formed with a clamping screw hole, and the other expansion restraining member is formed with a screw rod through hole corresponding to the clamping screw hole. In the body and the cover, a through hole is formed at a position corresponding to the holding screw hole and the screw rod through hole, and the screw rod passes through the screw rod through hole and the through hole from the outside of the other expansion inhibiting member. The ejector according to claim 1, wherein the screw of the screw rod is screwed into the clamping screw hole.

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