JPH0680877U - Small pump - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the discharge pressure of the diaphragm pump. [Structure] A diaphragm portion 41 driven by a motor 1, a pump chamber 33 in which the diaphragm portion 41 constitutes a part of a wall surface, and an inflow port 34 of the pump chamber 33 are connected to each other so that only an inflow into the pump chamber 33 is possible. A non-return valve 5 which permits, a non-return valve 6 which is connected to the discharge port 35 of the pump 33 and allows only the outflow from the pump chamber 33, and a compression which is driven by the motor 1 and causes the exhaust port 24 to communicate with the inflow port 34. And the machine 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small diaphragm type pump used for an air brush spraying device or the like.

[0002]

[Prior art]

 Conventionally, as such a small-sized pump, there is one using a bell-shaped diaphragm shown in FIG. 4, for example. This small pump is composed of a driving body (4) which is linked to a motor (1) through a crank (42) and reciprocates, a diaphragm portion (41) provided on the driving body (4), and a diaphragm portion. A check valve (5) in which (41) is connected to a pump chamber (33) forming a part of a wall surface and is connected to an inlet (34) of the pump chamber (33) and only allows inflow into the pump chamber (33). And a check valve (6) connected to the discharge port (35) of the pump chamber (33) and allowing only the outflow from the pump chamber (33).

When the diaphragm (41) is extended by the driving body (4) and the pump chamber (33) expands, air flows into the pump chamber (33) through the check valve (5), and then the diaphragm. When the part (41) is contracted and the pump chamber (33) is contracted, the air in the pump chamber (33) is compressed and discharged from the discharge port (35).

[0004]

[Problems to be solved by the present invention]

 In the conventional small diaphragm type pump described above, the inlet (34) of the pump chamber (33) is open to the atmosphere, and the inflow of outside air into the pump chamber (33) follows the expansion speed of the pump chamber (33). Without it, the pump chamber (33) becomes negative pressure. Therefore, even if the pump chamber (33) is reduced to compress the air, the pressure does not rise high.

Further, when the pump chamber (33) has a negative pressure, the diaphragm portion (41) is rolled inward. Since the diaphragm part (41) is repeatedly turned inward, stress is generated in the diaphragm part (41) and the life of the diaphragm part (41) is shortened. The present invention clarifies a small pump that solves the above problems by compressing air by a motor that drives a diaphragm and supplying the compressed air to the pump chamber.

[0006]

[Means for solving the problem]

 The small pump of the present invention comprises a diaphragm portion (41) driven by a motor (1), a pump chamber (33) in which the diaphragm portion (41) forms a part of a wall surface, and the pump chamber (33). Check valve (5) that is connected to the inlet (34) of the pump chamber (33) and allows only inflow into the pump chamber (33), and connected to the outlet (35) of the pump chamber (33) from the pump chamber (33). It is composed of a check valve (6) that allows only outflow, and a compressor (2) driven by the motor (1) and having an exhaust port (24) communicating with the inflow port (34).

[0007]

[Action]

 Since the exhaust port (24) of the compressor (2) communicates with the pump chamber (33) through the check valve (5) which allows only the inflow into the pump chamber (33), the diaphragm part (41) ) And the pump chamber (33) expands, the pump chamber (33) is filled with compressed air from the compressor (2), and the pump chamber (33) does not become negative pressure as in the conventional case. .

Therefore, there is a problem that the pump chamber (33) has a negative pressure, that is, the diaphragm portion (4
It is possible to solve the problem that the diaphragm portion (41) is stressed due to the fact that (1) is repeatedly turned inward, and the life of the diaphragm portion (41) is shortened.

Further, the compressed air flowing into the pump chamber (33) is further compressed by contracting the diaphragm part (41) and discharged from the discharge port (35), so that the discharge pressure is higher than that of a conventional pump of this kind. It can be expensive. Since the motor (1) that drives the diaphragm portion (41) also serves as the motor that drives the compressor (2), it is possible to prevent the size of the pump from increasing.

[0010]

【Example】

 FIG. 1 shows an example of the present invention, and FIG. 2 is a schematic view of the main part thereof. The housing (31) of the pump (3) is attached to the housing (11) of the motor (1) via the casing (21) of the centrifugal compressor (2).

The motor shaft (12) of the rotor (13) housed in the motor housing (11) penetrates the casing (21) of the compressor (2) and enters the housing (31) of the pump section (3). I have put it out. The motor housing (11) and the casing (21) of the compressor (2) are provided with flow holes (14) and (15) for supplying outside air into the casing (21).

In the casing (21) of the compressor (2), an impeller (22) attached to the motor shaft (12) is accommodated in the casing (21), and the casing (21) includes an impeller (22). A diffuser (23) is provided so as to surround 22), and an exhaust port (24) is further provided at one place. The housing (31) of the pump part (3) is formed in a cylindrical shape with an opening at the tip, and a lid plate (32) is attached to the opening.

In the housing (31) of the pump part (3), a crank (42) attached to the tip of the motor shaft (12), a drive body (4) connected to the crank (42), and the drive A diaphragm part (41) formed integrally with the body (4) is accommodated, and the outer peripheral part of the diaphragm part (41) is clamped and held by the opening edge of the housing (31) and the cover plate (32). There is. A pump chamber (33) is formed between the diaphragm portion (41) and the cover plate (32).

When the driving body (4) approaches the cover plate (32) side, the diaphragm portion (41) is folded between the driving body (4) and the housing (31), and the pump chamber (33) is to shrink. When the driving body (4) is separated from the cover plate (32), the diaphragm portion (41) extends and the pump chamber (33) expands. The cover plate (32) is provided with an inlet port (34) and a discharge port (35), and the inlet port (34) and the exhaust port (24) of the compressor (2) are connected to a connecting pipe (25). Will be connected in. A terminal device (9) such as an air brush is connected to the discharge port 835).

However, the exhaust port (24) of the compressor (2) communicates with the pump chamber (33) through a check valve (5) that allows only the inflow into the pump chamber (33). Therefore, when the diaphragm part (41) expands and the pump chamber (33) expands, the pump chamber (33) will be filled with compressed air from the compressor (2), and the pump chamber (33) will be negative as in the past. There is no pressure.

Therefore, there is a problem that the pump chamber (33) has a negative pressure, that is, the diaphragm portion (41) is repeatedly turned inward, so that stress is generated in the diaphragm portion (41) and the diaphragm portion (41) It is possible to solve the problem that the life of 41) becomes short.

Further, the compressed air flowing into the pump chamber (33) is further compressed by contracting the diaphragm part (41) and discharged from the discharge port (35), so that the discharge pressure is higher than that of a conventional pump of this kind. It can be expensive. Furthermore, since the motor (1) that drives the diaphragm portion 841 also serves as the motor that drives the compressor (2), it is possible to prevent the size of the pump from increasing.

FIG. 3 shows another embodiment, in which the exhaust port (24) of the compressor (2) is provided with a bifurcated branch pipe (8) and one branch pipe (81) with a check valve. The branch pipe (82) is connected to the inlet port (34) of the pump unit (3) via (5) and the terminal device (9) such as an air brush via a check valve (7). .

The discharge port (35) of the pump portion (3) is located downstream of the check valve (7) on the branch pipe (82) on the side of the terminal device (9) via the check valve (6). It is in communication. As for the two check valves (5) and (7) on the branch pipes (81) and (82), the check valve (5) on the pump chamber (33) side is better than the other check valve (7). Open with low pressure.

Compressed air from the compressor (2) flows into the pump chamber (33) along with the expansion of the pump chamber (33), and the reduction of the pump chamber (33) causes a termination from the check valve (6). Head to device (9). At this time, a back pressure acts on the check valve (7) of the line that directly goes from the compressor (2) to the end device (9), and the compressed air from the compressor (2) is more than this back pressure. If the pressure is high, the compressed air from the compressor (2) flows into the pump chamber (33) via the check valve (5) and goes to the end device (9) via the check valve (7). You can understand it.

The pump of FIG. 3 is effective in the case where a large amount of air is required at first rather than the air having a high pressure, such as inflating a rubber boat.

The above description of the embodiments is for explaining the present invention, and should not be understood so as to limit the invention described in the scope of the utility model registration request or to reduce the scope. Further, the configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the scope of claims for utility model registration.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a small pump according to the present invention.

FIG. 2 is a schematic explanatory view of a main part of FIG.

FIG. 3 is a schematic explanatory view of a main part showing another embodiment.

FIG. 4 is a schematic explanatory view of a main part of a conventional example.

[Explanation of symbols]

 (1) Motor (2) Compressor (3) Pump (41) Diaphragm (5) Check valve (6) Check valve

Claims (1)

[Scope of utility model registration request] 1. A diaphragm portion (41) driven by a motor (1), a pump chamber (33) in which the diaphragm portion (41) forms a part of a wall surface, and an inlet of the pump chamber (33). Check valve (5) connected to (34) and allowing only inflow to pump operator (33)
And the pump chamber (33) connected to the discharge port (35) of the pump chamber (33).
A small pump composed of a check valve (6) that allows only the outflow from the compressor and a compressor (2) driven by the motor (1) and having an exhaust port (24) communicating with the inflow port (34). .