JP3714537B2 - Electromagnetic compressor and manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic compressor and a manufacturing method, and more particularly to an electromagnetic compressor and a manufacturing method suitable for use in suction and compression of combustible gas such as city gas or other gases.
[0002]
[Prior art]
Conventionally, an electromagnetic compressor that compresses and discharges a fluid such as air has been widely used, and various inventions related to the electromagnetic compressor have been made. A typical example of this type of electromagnetic compressor is described in Japanese Patent Publication No. 57-30984, for example, and will be briefly described with reference to FIG.
[0003]
In the electromagnetic compressor 100, a front frame 102 and a front cover 103 are sequentially arranged in the front (left side in the figure) around the fixed electromagnetic circuit 101, while the rear part is arranged in the rear (right side in the figure). The frame 104 and the rear cover 105 are sequentially arranged, and these are joined together to form an outer shell of the electromagnetic compressor 100.
[0004]
The front frame 102 has a front hook 106 and a rear hook 107, and the front hook 106 is formed with a front fitting tube portion 108 and a rear fitting tube portion 109 that are integrally and centered therewith. Has been. A front cylinder 110 is inserted into the front fitting cylinder portion 108, a rear cylinder 111 is inserted into the rear fitting cylinder portion 109, and the front frame 102 and the rear cylinder 111 are connected to screws 112, 112, It is fixed in one piece.
[0005]
The rear frame 104 includes a front collar 113 and an outer collar 114, and both the rear collar 107 of the front frame 102 and the front collar 113 of the rear frame 104 are screwed to the fixed electromagnetic circuit 101. For this reason, the opposing surfaces of the rear rod 107 and the front rod 113 are abutted against the front surface and the rear surface of the fixed electromagnetic circuit 101, respectively.
[0006]
A coil 115 is wound around the fixed electromagnetic circuit 101, and the N-pole or S-pole magnetic pole formed by energizing the coil 115 is formed by the rear fitting cylinder portion 109 formed in the front-rear direction. It is arranged in the notch. A magnetic armature 120 that is electromagnetically attracted to the magnetic pole is sandwiched between a front piston 122 having a piston head 121 that slides in the front cylinder 110 and a rear piston 123 that slides in the rear cylinder 111, and a screw 124. Thus, the three are fixed together. A return spring 126 is disposed between the rear piston 123 and the cap 125 of the rear cylinder 111.
[0007]
In the compressor having the above-described configuration, when the fixed electromagnetic circuit 101 is excited, the magnetic armature 120 integrated with the front and rear pistons 122 and 123 (hereinafter simply referred to as the piston 122) causes the elastic force of the return spring 126 to be generated. The electromagnetic attraction moves forward as shown in FIG. On the other hand, when the excitation is released, the piston 122 is pressed by the return spring 126 and moves backward. By the reciprocation of the piston 122, the air in the working chamber 127 defined in the front cylinder 110 repeats a dense state.
[0008]
That is, when the piston 122 moves backward due to the electromagnetic attraction force, the suction valve 128 provided in the piston head 121 opens toward the working chamber 127, and the air introduced into the airframe from the suction port 130 of the rear cover 105 is Then, it flows into the working chamber 127 through the filter 131, the supply holes 132 and 132, and the suction port 133. On the other hand, when the piston 122 moves forward by being pressed by the return spring 126, the air in the working chamber 127 becomes dense. Then, the discharge valve attached to a part of the wall portion of the working chamber 127 is opened, and the compressed air passes through the discharge port 134 and the tank 135 and from the discharge port 136 to an external device connected to a hose as necessary. Supplied.
[0009]
[Problems to be solved by the invention]
However, if the compressor having the above-described configuration is applied to suction and compression of combustible gas such as city gas, the combustible gas sucked into the working chamber 127 passes through the electrical part, for example, the periphery of the coil 115 or the like. There is a problem in that it is guided to the supply hole 132 and the suction port 133. In addition, since the front surface and the rear surface of the fixed electromagnetic circuit 101 and the rear ridge 107 and the front ridge 113 are in abutment with each other, there is a risk that the combustible gas leaks to the outside through the abutment.
[0010]
The present invention has been made in view of the above-described prior art, and an object of the present invention is to provide an electromagnetic compressor (or a fuel cell pump) and a manufacturing method suitable for use in suction and compression of combustible gas and the like. It is to provide. Another object is to provide an electromagnetic compressor and a manufacturing method capable of reducing the manufacturing cost.
[0011]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides an electromagnetic compressor including a piston that reciprocates in a cylinder by an attractive force of an electromagnet and a resilient force of a return spring. A housing assembly formed by integrally molding a hole and the electromagnet having a magnetic pole that is coaxial with the central hole and arranged orthogonally, and is inserted into the central hole of the housing assembly The first feature is that it is provided with a cylinder having an arbitrary inner diameter.
[0012]
According to another aspect of the present invention, there is provided a housing assembly in which a central hole in which the cylinder and the piston are accommodated, and the electromagnet having a magnetic pole that is coaxial with the central hole and arranged orthogonally are molded integrally with a resin. And a step of inserting a front cylinder having the same outer diameter and an arbitrary inner diameter into the front portion of the central hole of the housing assembly, and using the same size housing assembly, The second feature is that an electromagnetic compressor having a cylinder and a piston having a diameter is prepared.
[0013]
According to these features, it is possible to completely eliminate the fear that fluid such as flammable gas compressed by the electromagnetic compressor leaks to the outside, and equipped with a piston of any outer diameter using a common housing assembly It becomes possible to produce an electromagnetic compressor.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 (a) is a cross-sectional view of an embodiment of the electromagnetic compressor of the present invention, and is a cross-sectional view taken along a plane parallel to the winding surface of a coil that passes through its central axis a1 and is wound around an iron core. Indicates. 1 (b) and 1 (c) show a left side view and a right side view of FIG. 1 (a), respectively.
[0015]
The electromagnetic compressor is coaxial with the central axis a1, and is arranged in order from the front direction (left direction in the figure) to the rear direction (right direction in the figure) in order, and is integrally formed with a resin. It has a molded housing assembly 2 and a rear cylinder 3. Inside the front cylinder 1, the housing assembly 2, and the rear cylinder 3 are provided a front piston 4, a magnetic armature 6, and a rear piston 5 that slide on the inner surfaces thereof. The magnetic armature 6 is sandwiched between the rear end surface 4a of the front piston 4 and the front end surface 5a of the rear piston 5, and the three members are joined together. A through hole 7 extending in the direction of the central axis a1 is provided at the center of the front piston 4 and the rear piston 5, and an inlet valve 8 is attached to the front end of the through hole.
[0016]
A head cap 9 is provided in front of the front piston 4 so as to face the front piston 4, and is a front end of the front cylinder 1 and the housing assembly 2, and is a damper portion in the working chamber 10. A discharge hole 10b is provided at a position opposite to 10a, and an outlet valve 11 is attached to the outside of the housing assembly 2 so as to close the discharge hole 10b. The fluid delivered from the outlet valve 11 is guided to the fluid discharge hole 12. A pipe connection device such as a nipple is coupled to the fluid discharge hole 12.
[0017]
On the other hand, a return spring 14 is disposed between the rear piston 5 and the end cap 13. The head cap 9 and the end cap 13 are fixed together with the housing assembly 2 by screws 15. A fluid inlet hole 16 is formed in a part of the end cap 13, and fluid is sucked through the fluid inlet hole 16 when the piston is in the suction cycle. A pipe connection device such as a nipple is coupled to the fluid inflow hole 16.
[0018]
FIG. 2 is a view of the cross section of FIG. 1 taken along the line AA as seen in the direction of the arrow. 1 and 2 are denoted by the same reference numerals. In FIG. 2, the illustration of the magnetic armature 6 or the rear piston 5 coming to a position facing the magnetic pole 20a is omitted.
[0019]
An electromagnet that electromagnetically attracts the magnetic armature 6 is disposed in the plane of FIG. The iron core 20 of the electromagnet is arranged coaxially and orthogonally to the pistons 4 and 5, and a bobbin 21 around which a coil 22 is wound is fitted into the arm portions 20 b and 20 b. When the coil 22 is energized, magnetic poles 20a and 20a are formed at the open ends of the arm portions 20b and 20b. From this figure, the inner and outer periphery of the iron core 20 and the outer periphery of the bobbin 21 and the coil 22 are molded with resin, and the iron core 20, the bobbin 21 and the coil 22 are integrated with the housing assembly 2, and the front portion It can also be seen that the outer wall of the central hole in which the rear cylinders 1 and 3 are inserted and the front piston 4, the magnetic armature 6 and the rear piston 5 move back and forth is mainly formed of the resin. Reference numerals 20d and 20e are holes through which screws for bundling the iron core 20 are passed.
[0020]
From the above, the cylinders 1 and 3, the outer periphery of the iron core 20, and the outer periphery of the bobbin 21 and the coil 22 are completely molded with resin as shown in FIG. In addition, it can be understood that the outer wall of the passage through which the gas formed by the through hole 7 passes has a sealed structure.
[0021]
Next, the manufacturing method of the structure of the principal part of this embodiment is demonstrated with reference to Fig.3 (a)-(c). First, as shown in FIG. 3A, a lower mold 40 having a centering cylindrical protrusion 41 at the center is prepared. On the other hand, an electromagnet part 42 in which the iron core 20, the bobbin 21, and the coil 22 are integrated is prepared separately. Then, as shown in FIG. 3 (b), the electromagnet portion 42 is set in the lower mold 40. In other words, the arm portions 20b and 20b of the electromagnet portion 42 formed by the opposing magnetic poles 20a and 20a are inserted into the cylindrical protrusion 41, whereby the electromagnet portion 42 is set on the lower mold 40.
[0022]
Next, as shown in FIG. 3 (c), an upper mold 43 is placed on the lower mold 40, and from a resin injection hole 44 formed in the upper mold 43, it becomes a fluid at a high temperature and at a normal temperature. Curing resin is added. When the molded product is taken out from the mold when the resin is cured, the portion sandwiched between the head cap 9 and the end cap 13 shown in FIG. 1 includes the piston, the armature and the front and rear cylinders 1 and 3. The housing assembly 2 which is the removed portion is obtained.
[0023]
When the housing assembly 2 is obtained, a process of inserting the front cylinder 1 and the rear cylinder 3 into the inner wall of the central hole coaxial with the central axis a1 of the housing assembly 2 is performed. At this time, as the front cylinder 1, for example, as shown in FIG. 4, a front cylinder 51 having an inner diameter that matches the outer diameter of the front piston 52 to be used is inserted into the housing assembly 2. Can do. That is, as long as the outer diameter is the same, a front cylinder having an arbitrary inner diameter can be freely inserted into the housing assembly 2. As a result, the same housing assembly can be applied to a piston having an arbitrary diameter without changing the design of the housing assembly 2 according to the diameter of the piston to be used.
[0024]
As described above, after the process of inserting the front cylinder 1 or 51 and the rear cylinder 3 into the housing assembly 2 is completed, the description is omitted because it is an assembly process similar to the conventional one.
[0025]
Next, the operation of the electromagnetic compressor of this embodiment will be described with reference to FIG.
[0026]
Gas such as combustible gas enters the rear cylinder 3 through the fluid inflow hole 16. Now, when the electromagnetic attraction force from the magnetic pole 20a is applied and the pistons 4 and 5 are moved backward (forward movement), the inlet valve 8 is opened and the gas is sent into the working chamber. At this time, the outlet valve 11 is closed. Next, when the electromagnetic attractive force is stopped and the pistons 4 and 5 are moved forward (returned) by the elastic force of the return spring 14, the inlet valve 8 is closed and the gas in the working chamber 10 is compressed. When the pressure of the gas exceeds a predetermined value, the outlet valve 11 is opened and discharged through the fluid discharge hole 12 on the head cap 9 side. At this time, since the foremost part of the front piston 4 passes through the discharge port 10b and closes the discharge port 10b, an air damper chamber is formed between the head of the front piston 4 and the outer peripheral wall of the head cap 9. The For this reason, it is possible to prevent the piston shock from occurring due to the head of the front piston 4 colliding with the outer peripheral base of the head cap 9 during the compression process.
[0027]
According to the present embodiment, a gas such as a combustible gas mainly passes only through the cylinders 1 and 3 and the through hole 7 and does not pass through an electrical part such as the coil 22. The gas does not touch the electrical part, and safety can be improved. Further, unlike the conventional apparatus, there is no butt portion in the apparatus, and the periphery of the gas passage is completely sealed with resin, so that there is no possibility that the gas leaks to the outside of the apparatus.
[0028]
Further, according to the present embodiment, a common housing assembly can be used even if the diameters of the piston and cylinder used are different.
[0029]
【The invention's effect】
As is clear from the above description, according to the present invention, the passage from the suction to the discharge of the gas has a sealed structure, so that the gas touches the electrical part of the electromagnetic compressor or is exposed to the outside. Can be prevented.
[0030]
Further, even if the diameters of the piston and cylinder used are different, a common housing assembly can be used, so that the manufacturing process of the device can be simplified and the manufacturing cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the direction of the central axis and a left and right side view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an explanatory diagram showing a manufacturing process of the embodiment.
FIG. 4 is a cross-sectional view in the central axis direction showing an application example of the present invention.
FIG. 5 is a cross-sectional view of an example of a conventional device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 51 ... Front cylinder, 2 ... Housing assembly, 3 ... Rear cylinder, 4, 52 ... Front piston, 5 ... Rear piston, 6 ... Magnetic armature, 7 ... Through-hole, 8 ... Inlet valve, 9 DESCRIPTION OF SYMBOLS ... Head cap, 11 ... Outlet valve, 12 ... Fluid discharge hole, 13 ... End cap, 16 ... Fluid inflow hole, 20 ... Iron core, 20a ... Magnetic pole, 21 ... Bobbin, 22 ... Coil

Claims (3)

In an electromagnetic compressor equipped with a piston that reciprocates in a cylinder by the attractive force of an electromagnet and the elastic force of a return spring,
A housing that is formed by integrally molding a resin with a central hole in which the cylinder and the piston are accommodated, and the electromagnet having a magnetic pole that is coaxial with the central hole and disposed orthogonally;
A cylinder having an arbitrary inner diameter inserted into the central hole of the housing assembly;
An electromagnetic compressor characterized in that a common housing assembly can be applied to a piston having an arbitrary diameter. The electromagnetic compressor according to claim 1,
The electromagnetic compressor according to claim 1, wherein the cylinder having an arbitrary inner diameter is a front cylinder. A method of manufacturing an electromagnetic compressor having a piston that reciprocates in a cylinder by an attractive force of an electromagnet and a resilient force of a return spring,
A step of forming a housing assembly by integrally molding a central hole in which the cylinder and the piston are accommodated, and the electromagnet having a magnetic pole that is coaxial with the central hole and disposed orthogonally;
A step of inserting a front cylinder having the same outer diameter and an inner diameter at the front of the central hole of the housing assembly;
A method for manufacturing an electromagnetic compressor, characterized in that electromagnetic compressors having cylinders and pistons of various diameters are produced using housing assemblies of the same size.

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