KR940008439Y1 - Electromagnetically driven pump - Google Patents

Abstract

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Description

Electronic vibrating piston pump

1 is a longitudinal side view showing an embodiment of the present invention.

2 is a cross-sectional view and the side view A-A of FIG.

3 is a plan view of a flat valve.

4 is a view of the valve seat in the b direction of FIG.

Figure 5 is a longitudinal side view of an embodiment other than the present invention shown by cutting the main portion.

6 is a left side view of FIG.

7 is a right side view of FIG.

8 is a cross-sectional view taken along the line C-C of FIG.

9 is a cross-sectional view taken along the line D-D of FIG. 6.

10 is a cross-sectional view taken along the line E-E of FIG.

* Explanation of symbols for main parts of the drawings

1: head carver 2: flat valve

2A: intake valve 2B: discharge valve

3: valve seat 5: yoke core

6 bobbin 7 front magnet yoke

8: permanent magnet 9: rear magnet yoke

10 cylindrical cylinder 11: piston body

12: fixed core 14: spring

20: piston 21,22: fluid passage

30 mold part 32 pressure chamber

52A, 52B: Fluid chamber 53A, 53B: Fluid passage

54: mold part

[Industrial use]

The present invention relates to an electronic free piston pump, and in particular, by reciprocating a piston (free-piston) configured to slide in a predetermined direction by a spring with an electromagnet, the volume in the pressure chamber is reduced by this reciprocating motion. The present invention relates to an electronic free piston pump of the type which changes and suctions and discharges a fluid.

[Prior art]

A relatively compact compression pump, which is conventionally connected to a movable body having a permanent magnet or a magnetic body, and is operated using an electronic circuit, and thus the volume of the pressure chamber having the diaphragm as one wall surface. Is configured to discharge or draw fluid such as air.

Such a pump (hereinafter referred to as a diaphragm pump) is described in Japanese Patent Laid-Open Nos. 63-65182, 63-176680, 63-227978, and the like.

[Problem to Solve]

The diaphragm pump has the following problems.

(1) Since the diaphragm is bent every time the movable body reciprocates, or the diaphragm is formed of a material such as synthetic rubber having plasticity, it is easy to be damaged. Therefore, it is difficult to maintain.

In order to prevent damage, if the diaphragm is made of high durability, the desired pressure and flow rate cannot be expected, the cost is high, and the structure of the diaphragm support part is complicated, and the configuration of this diaphragm pump is complicated, Productivity falls.

(2) Since the movable body is supported by the diaphragm itself, the wheel of the diaphragm may cause the movable body to come into contact with the core or the like during operation. In this case, the center coincidence state is broken and noise is generated, or finally the diaphragm pump Is broken.

This invention is made | formed in order to solve each problem mentioned above, The objective is to provide a pump apparatus which is easy to maintain, and is simple in structure, manufactured at low cost, and is durable.

[Means and Actions to Solve the Problem]

In order to solve the above problems, the present invention is made of a cylindrical shape having a axial center length so that a closed pressure chamber is formed in both ends thereof, and a non-magnetic material having a low permeability at least in the moving range of the piston in the inner diameter of the coil. The piston is provided with a thin bearing, and the piston has a piston head and a permanent magnet symmetrically, and the left and right permanent magnets are connected to each other in a hollow state. It is characterized in that the return spring is provided symmetrically, and a stator core is provided between the central portion of the coil inner diameter portion and the bearing.

When an alternating current flows through the coil, the magnet is attracted and repelled by the leaking magnetic flux. As a result, a cylindrical cylindrical bearing made of a thin material on the piston is always maintained in a centered state, thereby reciprocating to change the volume in the pressure chamber. Fluid is sucked and discharged in the pressure chamber.

EXAMPLE

Next, the present invention will be described in detail with reference to the drawings. In each figure, the same code | symbol has shown the same or equivalent part, respectively. Also in FIG. 4, the flat valve 2 is shown by an imaginary line. In addition, the base 31 shown in FIG. 2 accommodates the anti-vibration rubber 17 of FIG. 1, and this base 31 is omitted in FIG.

In FIG. 1 and FIG. 2, the cylindrical coil 10 is wound around the bobbin 6 of the failure shape shape | molded by resin. The length of the bobbin 6 is formed slightly shorter than the movable range of the piston mentioned later, ie, the reciprocating distance.

In the inner central portion of the bobbin 6, a cylindrical stator core 12 formed of a magnetic material such as low carbon steel is mounted. Further, inside the stator core 12, a bearing 13 made of crystalline glass, stainless steel, brass, or the like, which is as thin as possible, is provided. Although the cross-sectional shape of this bearing is formed in the cylindrical shape according to the cross-sectional shape of the following piston, as long as it is a surface suitable for freely sliding the outer peripheral surface of a piston, it may not be a cylindrical shape.

The outer side of the cylindrical coil 10 is provided with a yoke core 5 formed of a magnetic material such as low carbon steel.

The bobbin 6 and the stator core 12 are molded by resin (symbol 30) so that their relative positional relationship is fixed. The mold part 30 is made so that the inner wall of the bearing 13 is exposed.

Inside the bearing 13, the piston 20 is provided to slide freely. The piston 20 has a cylindrical piston body 11 formed of a nonmagnetic material such as resin, carbon, aluminum, etc. at the center thereof, and a pair of front and rear front magnet yokes fixed to both ends of the piston body 11 ( 7), the permanent magnet 8 and the second half magnet yoke 9, and the front magnet yoke 7 constitutes a piston head.

The front magnet yoke 7 and the rear magnet yoke 9 are made of a magnetic material such as low carbon steel, and the magnet 8 is made of, for example, rare earth.

Further, the rear magnet yoke 9 has a plate shape, and is provided at both ends of the piston body 11 at a required interval. Thus, the permanent magnet 8 is installed on the outside thereof, and the front magnet yoke 7 is installed on the outside thereof, and each of them is in close contact with each other and fixed to both ends of the piston body 11.

In addition, the permanent magnet 8 is installed so that the opposite sides face the same pole. In the example shown in FIG. 1, each permanent magnet 8 is provided so that the side facing the rear yoke magnet yoke 9 may be an S pole.

The piston 20 is a pair of which will be described later so as to be located at the center of the motor coil 10, that is, the center of the stator core 12 in the state where the motor coil 10 is not coined (neutral position). It is supported by the spring 14 so that a balance may be achieved.

A head cover 1 formed of a resin or the like is attached to both ends of the motor coil 10 via a 0 ring 4, a valve seat 3, and a flat valve 2. This attachment is achieved by screwing the bolt 16 to the female thread formed in the yoke core 5.

The flat valve 2 is a plate-shaped valve formed of a material having plasticity such as synthetic rubber, and as shown in FIG. 3, a pair of valve bodies (intake valve 2A and discharge valve 2B) are provided. Equipped.

The valve seat 3 is molded of resin or the like, and is flat to a depth almost equal to the thickness of the flat valve 2 to accommodate the flat valve 2 as shown in FIGS. 1 and 4. To concave than the first concave portion 3A at a position facing the first concave portion 3A and the suction valve 2A, which is formed in a contour (elliptical in this example) that is substantially the same as the outer contour of the valve 2. The 2nd recessed part 3B formed, and the 3rd recessed part 3C formed so as to be concave rather than the said 2nd recessed part 3B adjacent to this 2nd recessed part 3B are provided.

The fluid passage 21 is formed in the portion where the third recessed portion 3C of the valve seat 3 is formed so as not to face the intake valve 2A. In the portion where the first recessed portion 3A of the valve seat 3 is formed, the fluid passage 22 is formed at the portion facing the discharge valve 2B. The fluid passages 21 and 22 penetrate the valve seat 3.

The head cover 1 has a suction port 1A at a position facing the intake valve 2A of the flat valve 2 and a position larger than the outline of this discharge valve 2B at a position facing the discharge valve 2B. The recessed part 1C is formed. The recessed portion 1C communicates with the discharge port 1B.

As shown in FIG. 1, the pulley valve 2 is provided to pressurize the valve seat 3 and the head cover 1. Thus, in normal operation, the suction valve 2A is in close contact with the periphery of the inlet port 1A formed in the head cover 1, and the discharge valve 2B is in contact with the periphery of the fluid passage 22 formed in the valve seat 3. It is to be in close contact.

The spring 14 provided between the valve seat 3 and the piston 20 is formed of stainless steel wire or the like, and reference numeral 15 is a spring seat formed of stainless steel plate or the like for supporting the spring 14.

The leg portion 18 is formed integrally with the mold portion 30 at the lower portion of the mold portion 30, and the dustproof rubber 17 is attached to the bottom portion thereof. The anti-vibration rubber 17 is housed in the pedestal 31 (FIG. 2).

In addition, as shown in FIG. 1, by attaching the valve seat 3, a closed pressure chamber 32 is formed between the valve seat 3 and the piston 20. As shown in FIG.

In one embodiment of the present invention having the above configuration, when a synchronous current of commercial alternating current flows through the cylindrical coil 10, the magnetic flux passes between the yoke core 5 and the stator core 12 so that the magnetic circuit passes. Is formed. Here, a magnetic material is not provided between the ends (parts indicated by the symbols L and R) located at both ends of the cylindrical coil 10 of the yoke core 5 and the both ends of the stator core 12 (that is, the non-magnetic material). Since the leakage magnetic flux is generated, magnetic poles S and N are alternately generated at both ends L and R of the yoke core 5 and both ends of the stator core 12.

That is, for example, a magnet in the case where an S pole is formed at the half-wave part L of one side of the alternating current, an N pole is formed at the left end of the stator core 12, and an S pole is formed at the right end of the stator core 12. By the magnetic action of (8), the piston 20 slides to the left axis of FIG.

Next, in the other half wave, since the magnetic poles of the respective parts are reversed, the piston 20 slides to the right of the same figure.

Therefore, when the natural frequency of the piston 20 system of this pump is substantially matched with the frequency of the power supply which is supplied to the cylindrical coil 10, the piston 20 will be in a resonance state and will perform a rollback motion.

The reciprocating motion of the piston 20 introduces a fluid such as air into the pressure chamber 32 from the inlet 1A through the intake valve 2A, the third concave portion 3C and the fluid passage 21. The fluid is discharged to the discharge port 1B through the fluid passage 22, the discharge valve 2B, and the recess 1C.

[Modification]

(1) In the pump shown in FIG. 1, pressure chambers 32 are formed on both sides of the piston 20, and two sets of the inlet port 1A and the discharge port 1B communicate with the pressure chamber 32. Although the two inlet ports 1A and the discharge port 1B exist independently, the two inlet ports 1A are connected in common and the two outlet ports 1B are jointly connected (parallel connection). good. Accordingly, the discharge port and the suction port of this pump are each bundled together. In addition, one discharge port 1B may be connected to the other suction port 1A and connected in series. The fluid passages for the parallel connection or the series connection may be formed in the mold section 30. An embodiment of such a parallel connection will be described next.

In FIG. 7, hidden lines such as the flat valve 2, the fluid chambers 52A and 52B, the fluid passages 53A and 53B, and the like as shown in FIG. 6 are omitted in order to make the drawing easy to see. In addition, in FIGS. 5-10, the same code | symbol as FIG. 1-FIG. 4 shows the same or equivalent part, and the description is abbreviate | omitted. In each drawing, reference numeral 55 denotes a lead wire drawn out from the prime mover coil 10 of the electromagnetic vibrating piston pump.

This embodiment connects the inlet port 1A and the outlet port 1B provided at both ends of the electromagnetic vibrating piston pump shown in FIG. 1 to a pair of fluid chambers 52A and 52B, which will be described later, respectively. And 52B are connected to the fluid passages 53A and 53B to be described later, and are connected to common intake ports and discharge ports (symbols 1A and 1B in FIGS. 5 and 7).

In FIGS. 5-10, reference numeral 52A and 52B are the recessed parts formed in the head cover 1 provided in the both ends of the piston 20, and are closed by the lid | cover 51, respectively. In FIG. 5, illustration of the fluid chambers 52A and 52B provided in the right side of the same figure is abbreviate | omitted.

The pressure chamber 32 provided at both ends of the piston 20 is connected to the fluid chamber 52A through the intake valve 2A and the discharge valve 2B of the flat valve 2 by the method described above with reference to FIG. , 52B).

The pair of fluid chambers 52A and 52B communicate with the fluid passages 53A and 53B, respectively, and are each connected to the inlet port 1A and the outlet port 1B again.

In this manner, the intake valves 2A and the discharge valves 2B respectively provided at both ends of the piston 20 may communicate with the fluid passages 53A and 53B formed in the mold portion 30, respectively.

(2) In FIG. 1, although the spring 14 for supporting the piston 20 is provided in the both ends of this piston 20, you may be provided only in one end. In this case, the spring 14 needs to be fixed so as not to be disengaged from the ends of the spring seat 15 and the piston 20 (in this example, the magnet magnet yoke 7).

(3) In FIG. 1, although the magnet 8 is provided in the both ends of the piston 20, you may be provided only in the one end part.

In this case, there is no need to form a magnetic pole by providing a nonmagnetic region in the core on the side where the magnet 8 is not provided, so that one end (L portion or R portion) of the yoke core 5 and the stator core 12 are not provided. The ends of are connected by a magnetic material. As a result, energy loss due to leakage magnetic flux can be reduced.

(4) Although the piston magnet shown in FIG. 1 is configured to expose the proton magnet yoke 7 installed at both ends thereof, it is shown by reference numeral 54 in FIG. 5 so as not to expose the magnetic material, the magnet, and the like. As described above, the entire piston 20 may be molded by resin or the like. In this case, the occurrence of rust in the front magnet yoke 7 and the like can be prevented, and the reciprocating motion of the piston 20 can always be satisfactorily performed.

(5) The pump described above is used not only as a compression pump but also as a compact vacuum pump. As apparent from the above description, according to the present invention, the following effects are achieved.

[Effect of design]

(1) Since the reciprocating motion of the piston and the suction and discharge of the fluid can be performed without using the diaphragm, the diaphragm is not damaged and the durability of the pump device is improved.

(2) Since the piston is installed in the inner circumference of the cylindrical coil through the bearing, the piston can always be kept in the centered state and can be slidably moved. Therefore, the frequency of failure of the pump device is small and the configuration is simple in production. We can cut cost.

(3) Since the piston has a front and rear static structure and springs are added to both front and rear ends thereof, the stroke of the piston becomes constant. Furthermore, since the spring constant is easier than the diaphragm pump, stable operation can be expected.

(4) Since the piston is reciprocated by the permanent magnets provided at both ends of the piston, the compression ratio is increased by the reciprocating motion, thereby improving the efficiency of the pump device and contributing to miniaturization.

(5) Since pressure chambers are provided at both ends of the piston, the reciprocating operation of the piston is efficiently transmitted to the suction and discharge operations of the fluid, and as a result, the efficiency of the pump device is improved.

Claims (1)

The cylindrical single-phase coil 10, the piston body 11 which is freely slid in the direction of the center axis of the coil 10 inside the coil 10, and the magnets attached to the inner end surfaces of both sides thereof. The provided piston 20, the closed pressure chamber 32 configured to change its volume by sliding the piston 20, the inlet port 1A and the discharge port 1B connected to the pressure chamber 32 And an inlet valve (2A) and a discharge valve (2B) provided between the pressure chamber (32), the inlet port (1A), and the outlet port (1B), the coil 10 of the The inner peripheral portion is provided with a thin film bearing 13 made of a non-magnetic material having a low permeability at least in the movable range of the piston 20, and the piston 20 is symmetrically symmetrically with the piston head (front magnet yoke) 7: The magnet 8 is provided, and the left and right permanent magnets 8 are connected in a hollow state. The inner peripheral portion of the coil 10 is provided with a spring 14 for symmetrically returning the piston 20 to the neutral position, and the central portion of the inner peripheral portion of the coil 10 and the bearing 13. The stator core (12) is provided between, and the yoke core (5) is installed on the outer periphery of the coil (10).