CN214577648U - Atmospheric pressure sealing cavity system for preventing air from entering - Google Patents

Abstract

A normal pressure seal cavity system for preventing air from entering is used for sealing a primary cycloid oil pump and a secondary plunger oil pump in a diaphragm compressor, the primary cycloid oil pump and the secondary plunger oil pump are arranged on the outer side of a rear bearing seat of a crankcase of the diaphragm compressor and are connected with a crankshaft, and the seal cavity system comprises a lip seal, a primary end face seal, a secondary end face seal and a tertiary end face seal; a lip seal is arranged between the inner side of a rear bearing seat of a crankcase and a crankshaft, a first-stage end face seal is arranged between the outer side of the rear bearing seat of the crankcase and the upper surface of a second-stage plunger oil pump body, a second-stage end face seal is arranged between the lower surface of the second-stage plunger oil pump body and the upper surface of a first-stage cycloid oil pump body, a third-stage end face seal is arranged at the bottom end of the first-stage cycloid oil pump, and a liquid seal is arranged at an oil inlet of the first-stage cycloid oil pump. A lip seal and three end face seals are designed for an oil cavity of the two-stage oil pump, and an inlet liquid seal is arranged on the one-stage cycloid oil pump, so that the sealing of the oil pump is ensured, and no gas enters lubricating oil.

Description

Atmospheric pressure sealing cavity system for preventing air from entering

Technical Field

The utility model relates to a specific sealed chamber system of ordinary pressure that separates and prevent air admission in diaphragm compressor oil feeding system's sealed field.

Background

The compressor of the hydrogenation station is mainly used for injecting hydrogen into the hydrogen storage tank and pressurizing the hydrogen so as to enable the hydrogen storage tank to reach a device capable of providing sufficient pressure for the hydrogenation machine. The diaphragm compressor is a special device for compressing gas without leakage in a compression cavity. The high-pressure gas compression pump can provide good sealing performance, wide pressure range and large compression ratio, so the high-pressure gas compression pump is widely applied to compressing and conveying various high-purity gases in a hydrogenation station. The diaphragm is the core part of the diaphragm compressor, the piston pushes working oil in the oil cavity of the cylinder, and then the diaphragm is pushed to reciprocate in the diaphragm cavity so as to change the working volume of the air cavity, and a leakage-free periodic working process is realized under the matching of the suction valve and the exhaust valve. In the high-pressure compression diaphragm compressor, a diaphragm serves as an isolator between hydraulic oil and compressed gas, and is a medium for coupling multiple physical fields of the hydraulic oil and the compressed gas, and the motion synchronization, momentum and energy transfer, heat conduction and the like between the hydraulic oil and the gas depend on the diaphragm. When gas enters a lubricating oil system, the oil pressure of the oil cavity of the membrane head is insufficient, and further the service life of the membrane is influenced, so that how to ensure the sealing of the oil supply system is the problem to be solved at the present stage.

Disclosure of Invention

In order to solve the above problems, the present invention provides a normal pressure sealing cavity system for preventing air from entering, which is used for sealing a first-stage cycloid oil pump and a second-stage plunger oil pump in a diaphragm compressor, wherein the first-stage cycloid oil pump and the second-stage plunger oil pump are installed outside a rear bearing seat of a crankcase of the diaphragm compressor and connected with a crankshaft, and the sealing cavity system comprises a lip seal, a first-stage end face seal, a second-stage end face seal and a third-stage end face seal; be equipped with the lip seal between crankcase rear bearing seat inboard and the bent axle, be equipped with one-level end face seal between crankcase rear bearing seat outside and the second grade plunger oil pump body upper surface, be equipped with second grade end face seal between second grade plunger oil pump body lower surface and the one-level cycloid oil pump upper surface, one-level cycloid oil pump bottom is equipped with tertiary end face seal, one-level cycloid oil pump oil inlet department still is equipped with the liquid seal.

Further, a sealing groove is formed in the inner side of the rear bearing seat, and the lip-shaped sealing ring is arranged in the sealing groove to isolate the crankcase from the outside.

Furthermore, be equipped with the recess on the second grade plunger oil pump body upper surface, the rear bearing seat outside is equipped with the arch, the arch stretch in form one-level end face seal with the pivoted bent axle in the recess, prevent that gas from getting into between second grade plunger oil pump body upper surface and the rear bearing seat outside.

Furthermore, a cycloid pump base is arranged below the primary cycloid oil pump, and three-stage end face sealing is formed between the cycloid pump base and the primary cycloid oil pump as well as between the cycloid pump base and the rotating crankshaft, so that gas is prevented from entering between the cycloid pump base and the primary cycloid oil pump.

Furthermore, an oil inlet of the primary cycloid oil pump is provided with a bent pipe liquid seal.

The utility model has the advantages that:

the utility model discloses to the oil pocket of two-stage oil pump, design a lip seal and three end face seals to set up import liquid seal at one-level cycloid oil pump, ensured the sealed of oil pump, guarantee that no gas gets into lubricating oil.

Drawings

FIG. 1 is a sectional view of the internal structure of the present invention;

FIG. 2 is a cross-sectional view of a lip seal;

FIG. 3 is a cross-sectional structural view of the rear bearing block;

fig. 4 is a structural view of a two-stage plunger oil pump.

Drawing reference number

The oil pump comprises a one-level cycloid oil pump (1), a two-level plunger oil pump (2), a rear bearing seat (3), a crankshaft (4), lip seals (5), a one-level end face seal (6), a two-level end face seal (7), a three-level end face seal (8), a liquid seal (9), a seal groove (10), a lip seal ring (11), a groove (12), a protrusion (13) and a cycloid pump base (14).

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings, which are provided for illustration purposes only to help understanding the present invention and are not to be construed as limiting the present invention.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout.

The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

The utility model discloses a normal pressure seal cavity system for preventing air from entering, which is used for sealing a first-stage cycloid oil pump 1 and a second-stage plunger oil pump 2 in a diaphragm compressor, wherein the first-stage cycloid oil pump 1 and the second-stage plunger oil pump 2 are arranged outside a rear bearing seat 3 of a crankcase of the diaphragm compressor and are connected with a crankshaft 4, and the seal cavity system comprises a lip seal 5, a first-stage end face seal 6, a second-stage end face seal 7 and a third-stage end face seal 8; be equipped with lip seal 5 between 3 inboards of crankcase rear bearing seat and bent axle 4, be equipped with one-level end face seal 6 between 3 outsides of crankcase rear bearing seat and the 2 body upper surfaces of second grade plunger oil pump, be equipped with second grade end face seal 7 between 2 body lower surfaces of second grade plunger oil pump and the 1 upper surfaces of one-level cycloid oil pump, 1 bottom of one-level cycloid oil pump is equipped with tertiary end face seal 8, 1 oil inlet department of one-level cycloid oil pump still is equipped with return bend liquid seal.

The inner side of the rear bearing seat 3 is provided with a sealing groove 10, and a lip-shaped sealing ring 11 is arranged in the sealing groove 10 to isolate the crankcase from the outside.

Be equipped with recess 12 on the 2 physically upper surfaces of second grade plunger oil pump, the back bearing frame 3 outside is equipped with protruding 13, protruding 13 stretch in form one-level end face seal 6 with pivoted bent axle 4 in the recess 12, prevent that gas from getting into between 2 physically upper surfaces of second grade plunger oil pump and the back bearing frame 3 outside.

A cycloid pump base 14 is arranged below the primary cycloid oil pump 1, and a tertiary end face seal 8 is formed between the cycloid pump base 14 and the primary cycloid oil pump 1 as well as between the cycloid pump base 14 and the rotating crankshaft 4, so that gas is prevented from entering between the cycloid pump base 14 and the primary cycloid oil pump 1.

The embodiments of the present invention, it is understood that the above embodiments are exemplary and not intended to be construed as limiting, and those skilled in the art can change, modify, replace and modify the above embodiments without departing from the spirit and scope of the present invention, and the simple combination of the above embodiments is listed as the protection of the present invention.

Claims (5)

1. A normal pressure sealing cavity system for preventing air from entering is used for sealing a primary cycloid oil pump (1) and a secondary plunger oil pump (2) in a diaphragm compressor, the primary cycloid oil pump (1) and the secondary plunger oil pump (2) are arranged on the outer side of a rear bearing seat (3) of a crankcase of the diaphragm compressor and are connected with a crankshaft (4),

the seal cavity system comprises a lip seal (5), a primary end face seal (6), a secondary end face seal (7) and a tertiary end face seal (8); be equipped with lip seal (5) between crankcase rear bearing seat (3) inboard and bent axle (4), be equipped with one-level end face seal (6) between crankcase rear bearing seat (3) outside and second grade plunger oil pump (2) body upper surface, be equipped with second grade end face seal (7) between second grade plunger oil pump (2) body lower surface and one-level cycloid oil pump (1) upper surface, one-level cycloid oil pump (1) bottom is equipped with tertiary end face seal (8), one-level cycloid oil pump (1) oil inlet department still is equipped with liquid seal (9).

2. The atmospheric-pressure sealed-chamber system for preventing air entry of claim 1, wherein: the inner side of the rear bearing seat (3) is provided with a sealing groove (10), and the lip-shaped sealing ring (11) is arranged in the sealing groove (10) to isolate the crankcase from the outside.

3. The atmospheric-pressure sealed-chamber system for preventing air entry of claim 1, wherein: be equipped with recess (12) on the body upper surface of second grade plunger oil pump (2), the rear bearing seat (3) outside is equipped with arch (13), arch (13) stretch in recess (12) form one-level end face seal (6) with pivoted bent axle (4), prevent that gas from getting into between the body upper surface of second grade plunger oil pump (2) and the rear bearing seat (3) outside.

4. The atmospheric-pressure sealed-chamber system for preventing air entry of claim 1, wherein: a cycloidal pump base (14) is arranged below the primary cycloidal oil pump (1), and a tertiary end face seal (8) is formed between the cycloidal pump base (14) and the primary cycloidal oil pump (1) and between the cycloidal pump base (14) and the rotating crankshaft (4) to prevent gas from entering between the cycloidal pump base (14) and the primary cycloidal oil pump (1).

5. The atmospheric-pressure sealed-chamber system for preventing air entry of claim 1, wherein: the liquid seal (9) is a bent pipe liquid seal.

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