CN219299492U - Membrane head mechanism and diaphragm type compressor - Google Patents

Abstract

The utility model provides a membrane head mechanism and a diaphragm type compressor, wherein the membrane head mechanism comprises an air side membrane head; the oil side membrane head is arranged opposite to the air side membrane head, a containing cavity is formed in one side of the oil side membrane head, which faces the air side membrane head, an oil distribution disc is arranged in the containing cavity, and the oil distribution disc is in sealing fit with the containing cavity; the outer periphery of the diaphragm is pressed between the air side film head and the oil distribution disc; the first sealing ring is a metal sealing ring and is tightly pressed between the air side membrane head and the outer periphery of the membrane. The film head mechanism generally adopts the first metal sealing ring, and the first sealing ring has better stability under high-temperature and high-pressure conditions, and can obviously prolong the effective sealing life, thereby improving the sealing reliability of the film head mechanism and reducing the risk of air leakage of the film head mechanism.

Description

Membrane head mechanism and diaphragm type compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a membrane head mechanism and a membrane type compressor.

Background

The diaphragm compressor is a positive displacement compressor, and is widely applied to compressing and conveying high-purity gas, noble rare gas, poisonous and harmful gas and corrosive gas due to good tightness, wide pressure range and large compression ratio.

The sealing structure between the air side membrane head and the membrane of the existing membrane compressor is easy to deform and age in a high-temperature and high-pressure environment, so that sealing failure frequently occurs.

Disclosure of Invention

The utility model aims to provide a membrane head mechanism and a diaphragm type compressor, and aims to solve the problem that the sealing between a gas side membrane head and a diaphragm is invalid due to the fact that the existing sealing structure is easy to deform and age.

In order to solve the technical problems, the utility model adopts the following technical scheme:

in one aspect of the present utility model, there is provided a membrane head mechanism for a diaphragm compressor, comprising: an air side membrane head; the oil side membrane head is arranged opposite to the air side membrane head, a containing cavity is formed in one side of the oil side membrane head, which faces the air side membrane head, an oil distribution disc is arranged in the containing cavity, and the oil distribution disc is in sealing fit with the containing cavity; the outer periphery of the diaphragm is pressed between the air side film head and the oil distribution disc; the first sealing ring is a metal sealing ring and is tightly pressed between the air side membrane head and the outer periphery of the membrane.

In one aspect of the present utility model, a first groove with an opening is provided on a surface of the air side membrane head near one end of the membrane, the opening of the first groove faces the membrane, the first sealing ring is accommodated in the first groove, and a part of the first sealing ring protrudes out of the opening and abuts against the membrane.

In one aspect of the present utility model, the protruding height of the first sealing ring relative to the opening is 0.06mm to 0.07mm.

In one aspect of the present utility model, a surface of the first sealing ring protruding from one end of the opening is provided with a convex arc shape.

In one technical scheme of the utility model, one end of the first groove far away from the opening is a groove bottom surface, and the groove bottom surface is arranged into a concave arc shape;

the surface of one end of the first sealing ring, which is close to the bottom surface of the groove, is arranged into a convex arc shape.

In one technical scheme of the utility model, the cross section of the first groove comprises a first straight line segment, an arc line segment and a second straight line segment which are sequentially connected, wherein the first straight line segment, the arc line segment and the second straight line segment are sequentially connected to form a U shape, the distance between the first straight line segment and the second straight line segment is equal to the diameter of the first sealing ring, and the diameter of the arc line segment is equal to the diameter of the first sealing ring; the cross section of the first sealing ring is circular.

In one aspect of the present utility model, the film head mechanism further includes: the second sealing ring is an elastic sealing ring, is pressed between the air side membrane head and the outer periphery of the membrane, and is closer to the outer periphery of the membrane than the first sealing ring; the surface of the air side membrane head, which is close to one end of the membrane, is provided with a second groove with an opening facing the membrane, the second sealing ring is accommodated in the second groove, and a part of the second sealing ring protrudes out of the opening and is abutted to the membrane.

In one aspect of the present utility model, the film head mechanism further includes: the third sealing ring is an elastic sealing ring and is tightly pressed between the oil distribution disc and the outer periphery of the diaphragm; the oil distribution disc is provided with a third groove with an opening facing the diaphragm on the surface of one end, which is close to the diaphragm, of the oil distribution disc, the third sealing ring is accommodated in the third groove, and a part of the third sealing ring protrudes out of the opening and abuts against the diaphragm.

In one technical scheme of the utility model, the second sealing ring and the third sealing ring are positioned on two opposite sides of the diaphragm; and/or the number of the groups of groups,

the membrane is of a multi-layer structure, and at least comprises a gas side membrane layer, an intermediate membrane layer and an oil side membrane layer which are sequentially laminated from the gas side membrane head to the oil distribution disc.

In one technical scheme of the utility model, the air side membrane head comprises a cylinder cover and an air distribution disc, wherein the cylinder cover is nested at the outer side of the air distribution disc and is in sealing connection with the air distribution disc, one axial end of the air distribution disc extends out of the cylinder cover, and the membrane is clamped between the extending end of the air distribution disc and the oil distribution disc.

In one technical scheme of the utility model, the oil side membrane head comprises a cylinder sleeve and a cylinder body which are sequentially arranged along the axial direction, a first space penetrating along the axial direction is formed inside the cylinder sleeve, the oil distribution disc is embedded in the first space, and the extending end of the oil distribution disc extends into the first space and is in sealing connection with the cylinder sleeve;

the cylinder body is close to be equipped with on the surface of the one end of cylinder liner to keeping away from the sunken concave part of direction of cylinder liner, the concave part with first space is limited jointly hold the chamber, the inside of cylinder body is formed with along the second space that the axial runs through, the second space with hold the chamber intercommunication, the second space is used for placing the piston, the piston can be in the second space reciprocating motion.

In another aspect of the present utility model, the present utility model further provides a diaphragm compressor, including a power mechanism and a membrane head mechanism as described above, where the power mechanism is connected to a piston in the membrane head mechanism, and is used to drive the piston to reciprocate.

The membrane head mechanism comprises the air side membrane head, the oil side membrane head and the membrane, wherein the outer periphery of the membrane is tightly pressed between the air side membrane head and the oil distribution disc, a first sealing ring is arranged between the air side membrane head and the outer periphery of the membrane, the first sealing ring is a metal sealing ring, and the metal sealing ring has good stability under high temperature and high pressure conditions, so that the sealing effective life can be remarkably prolonged, the sealing reliability of the membrane head mechanism is improved, and the risk of air leakage of the membrane head mechanism is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.

Drawings

The above and other objects, features and advantages of the present utility model will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a cross-sectional view of a membrane head mechanism of an embodiment of the utility model.

Fig. 2 is an enlarged schematic view of a portion a of the film head mechanism of fig. 1 according to the present utility model.

Fig. 3 is an enlarged schematic view of the first seal ring and the first groove of the present utility model.

Fig. 4 is an enlarged schematic view of a portion B of the film head mechanism of fig. 1 according to the present utility model.

Fig. 5 is another cross-sectional view of a membrane head mechanism of an embodiment of the utility model.

The reference numerals are explained as follows:

1. an air side membrane head; 10. a cylinder cover; 11. a gas distribution plate; 12. an air cavity; 2. an oil side membrane head; 20. a cavity; 21. cylinder sleeve; 210. a first space; 22. a cylinder; 220. a concave portion; 221. a second space; 3. an oil distribution tray; 4. a membrane; 41. an air side film layer, 42 and an intermediate film layer; 43. an oil side membrane layer; 51. a first seal ring; 52. a second seal ring; 53. a third seal ring; 61. a first groove; 610. an opening; 611. a bottom surface of the groove; 62. a second groove; 63. and a third groove.

Detailed Description

While this utility model is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the utility model and is not intended to limit the utility model to that as illustrated.

Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the utility model, not to imply that each embodiment of the utility model must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiment shown in the drawings, indications of orientation (such as up, down, in, out, left, right, front, back, etc.) are used to explain the structure and movement of the various components of the utility model are not absolute but relative. These descriptions are appropriate when the components are in the positions shown in the drawings. If the description of the location of these components changes, then the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present utility model and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.

Preferred embodiments of the present utility model will be further elaborated below with reference to the drawings of the present specification.

The diaphragm type compressor generally comprises a gas side membrane head and an oil side membrane head, wherein an oil distribution disc is arranged in the oil side membrane head, a diaphragm is clamped between the gas side membrane head and the oil distribution disc, the diaphragm is used for dividing, an air cavity is formed on one side, close to the gas side membrane head, of the diaphragm, an oil cavity is formed on one side, close to the oil distribution disc, of the diaphragm, working fluid, such as hydraulic oil, is filled in the oil cavity, the diaphragm deforms under the driving of the hydraulic oil, and therefore compression and conveying of gas (such as hydrogen and helium) are achieved, and in the process, in order to guarantee conveying efficiency and safety, sealing requirements between the gas side membrane head and the diaphragm are strict.

In the prior art, a soft sealing ring is generally adopted for sealing between the air side membrane head and the membrane, and because a large amount of heat is generated in the compression process of the air, the soft sealing ring is easy to deform and age under the high-temperature and high-pressure environment, for example, high-temperature carbonization is generated, so that the sealing effect of the soft sealing ring on an assembly gap between the air side membrane head and the membrane is lost, the assembly gap between the air side membrane head and the membrane is exposed, and air leakage occurs. The molecular weight of the gases such as hydrogen, helium and the like is small, the gases are easy to leak out from an assembly gap between the gas side membrane head and the membrane, and certain gases such as hydrogen are inflammable and explosive, so that potential safety hazards exist.

Based on the above, the utility model provides a membrane head mechanism for a diaphragm compressor with high sealing reliability, so as to improve the reliability and safety of the diaphragm compressor.

A membrane head mechanism according to an embodiment of the present utility model is described below with reference to fig. 1 to 5.

As shown in fig. 1 to 5, the membrane head mechanism comprises an air side membrane head 1, an oil side membrane head 2, a membrane 4 and a first sealing ring 51, wherein the oil side membrane head 2 is arranged opposite to the air side membrane head 1, a containing cavity 20 is arranged on one side, facing the air side membrane head 1, of the oil side membrane head 2, an oil distribution disc 3 is arranged in the containing cavity 20, and the oil distribution disc 3 is in sealing fit with the containing cavity 20; the outer periphery of the membrane 4 is pressed between the air side membrane head 1 and the oil distribution disc 3; the first seal ring 51 is compressed between the gas side membrane head 1 and the outer periphery of the membrane 4, and the first seal ring 51 is a metal seal ring.

Specifically, the air side membrane head 1 and the oil side membrane head 2 can be fixedly connected or detachably connected through fastening structures such as bolts, buckles and the like, and the air suction and output are realized through the cooperation of the air side membrane head 1 and the oil side membrane head 2. In a specific example, a cavity 20 is arranged at one end of the oil side membrane head 2, which is close to the membrane 4, the cavity 20 can be used as an oil cavity for containing hydraulic oil, the oil distribution disc 3 is assembled in the cavity 20, a sealing element is arranged at the joint of the oil distribution disc 3 and the cavity 20 so as to realize the sealing connection of the oil distribution disc 3 and the cavity 20, and an oil distribution hole which can enable the hydraulic oil to flow is arranged on the oil distribution disc 3.

The diaphragm 4 is arranged between the air side film head 1 and the oil distribution disc 3, the air side film head 1 is provided with an air inlet valve port and an air outlet valve port, the air inlet valve port and the air outlet valve port are all check valves, an air cavity 12 is formed between the air side film head 1 and the diaphragm 4, and the diaphragm 4 seals the air cavity 12 from the air cavity 20, so that gas in the air cavity 12 cannot enter the air cavity 20, and hydraulic oil in the air cavity 20 cannot enter the air cavity 12. When the device is used, the power mechanism drives hydraulic oil to move, the hydraulic oil drives the membrane 4 to move in the direction away from the air side membrane head 1 or in the direction close to the air side membrane head 1, so that gas supplied to the air inlet valve port is sucked into the air cavity 12, and then the gas sucked into the air cavity 12 is compressed and then discharged from the air outlet valve port, and the device is reciprocated to realize continuous gas conveying.

Wherein, the outer periphery of diaphragm 4 compresses tightly between gas side membrane head 1 and oil distribution dish 3, and first sealing washer 51 sets up between the outer periphery of gas side membrane head 1 and diaphragm 4 for the assembly gap between sealed gas side membrane head 1 and the diaphragm 4 promotes air cavity 12 gas tightness. The first sealing ring 51 is a metal sealing ring, and because the metal material has good stability under high temperature and high pressure conditions, the first sealing ring 51 is not easy to deform or age in the use process of the diaphragm compressor, has good sealing strength and sealing effect, ensures the tightness of an assembly gap between the air side membrane head 1 and the membrane 4, and improves the reliability and the safety of the diaphragm compressor.

Wherein the metal sealing ring can be made of any metal with good stability under high temperature and high pressure conditions, and preferably the metal sealing ring is made of 304 stainless steel or 316 stainless steel.

In one aspect of the present utility model, a first groove 61 having an opening 610 is provided on a surface of the air-side membrane head 1 near one end of the membrane 4, the opening 610 of the first groove 61 faces the membrane 4, the first seal ring 51 is accommodated in the first groove 61, and a portion of the first seal ring 51 protrudes from the opening 610 and abuts against the membrane 4.

Specifically, as shown in fig. 2 and 3, the end face of the air-side membrane head 1, which is close to the membrane 4, is provided with the first groove 61, and by providing the first groove 61, it is convenient to assemble the first seal ring 51 between the air-side membrane head 1 and the outer periphery of the membrane 4, and the connection stability of the first seal ring 51 between the air-side membrane head 1 and the membrane 4 is improved. The first groove 61 has an opening 610, the opening 610 faces the diaphragm 4, and one axial side of the first seal ring 51 protrudes from the opening 610 and abuts against the diaphragm 4 to form a seal with the diaphragm 4.

In one embodiment of the present utility model, the protruding height of the first sealing ring 51 relative to the opening 610 is 0.06mm to 0.07mm, and the sealing performance is better.

In one embodiment of the present utility model, as shown in fig. 3, the surface of the first sealing ring 51 protruding from one end of the opening 610 is configured into a convex arc shape, so that an arc line sealing effect can be achieved, and the sealing effect is far better than that of the face seal, so that the sealing performance between the air side membrane head 1 and the membrane 4 is further enhanced.

In one aspect of the present utility model, the end of the first groove 61 away from the opening 610 is a groove bottom surface 611, and the groove bottom surface 611 is configured into a concave arc shape;

the surface of the first seal ring 51 near one end of the groove bottom surface 611 is provided in a convex arc shape.

Specifically, the groove bottom surface 611 of the first groove 61 and the surface of one end of the first sealing ring 51, which is close to the groove bottom surface 611, have an adapted shape, that is, the groove bottom surface 611 is in a concave arc shape, and the surface of one end of the first sealing ring 51, which is close to the groove bottom surface 611, is in a convex arc shape, so that the first sealing ring 51 can be better limited in the first groove 61, the connection stability of the first sealing ring 51 between the air side membrane head 1 and the outer periphery of the membrane 4 is improved, and the sealing effect is ensured.

In one technical scheme of the present utility model, as shown in fig. 3, the cross section of the first groove 61 includes a first straight line segment a, an arc segment b and a second straight line segment c which are sequentially connected, wherein the first straight line segment a, the arc segment b and the second straight line segment c are sequentially connected to form a U shape, the distance between the first straight line segment a and the second straight line segment c is equal to the diameter of the first sealing ring 51, and the diameter of the arc segment b is equal to the diameter of the first sealing ring 51; the first seal ring 51 has a circular cross-sectional shape.

Specifically, the cross-section of the first sealing ring 51 is circular, the cross-section of the first groove 61 is U-shaped, that is, the first groove 61 has a groove bottom 611 with a concave arc shape and an opening area with a rectangular shape, wherein the distance between the first straight line segment a and the second straight line segment c is equal to the diameter of the first sealing ring 51, and the diameter of the circular arc segment b is equal to the diameter of the first sealing ring 51.

In one embodiment of the present utility model, as shown in fig. 4, the membrane head mechanism further includes a second sealing ring 52, where the second sealing ring 52 is an elastic sealing ring, and is compressed between the air-side membrane head 1 and the outer periphery of the membrane 4, and is closer to the outer periphery of the membrane 4 than the first sealing ring 51.

The second sealing ring 52 can be matched with the first sealing ring 51 to further improve the tightness between the air side membrane head 1 and the membrane 4, wherein the second sealing ring 52 is closer to the outer periphery of the membrane 4 than the first sealing ring 51, namely, the second sealing ring 52 is closer to the outer side of the membrane head mechanism than the first sealing ring 51, and is relatively less influenced by high-temperature and high-pressure environment than the first sealing ring 51, so that the sealing effect life can be ensured while the tightness is ensured due to the fact that the sealing ring is configured into an elastic sealing ring.

In one embodiment of the present utility model, a second groove 62 with an opening facing the membrane 4 is provided on the surface of the air-side membrane head 1 near one end of the membrane 4, and the second seal ring 52 is accommodated in the second groove 62, and a part of the second seal ring 52 protrudes out of the opening and abuts against the membrane 4.

Specifically, the end surface of the air-side membrane head 1, which is close to the membrane 4, is further provided with a second groove 62, the second groove 62 and the first groove 61 are distributed at intervals, and compared with the first groove 61, the second groove 62 is closer to the outer edge of the air-side membrane head 1, so that the second sealing ring 52 can be conveniently assembled between the air-side membrane head 1 and the outer periphery of the membrane 4, and the connection stability of the second sealing ring 52 between the air-side membrane head 1 and the membrane 4 is improved. Wherein the second groove 62 has an opening facing the diaphragm 4, and the second seal ring 52 projects from the opening on one axial side thereof and abuts against the diaphragm 4 to form a seal with the diaphragm 4.

In one embodiment of the present utility model, as shown in fig. 4, the membrane head mechanism further includes a third sealing ring 53, where the third sealing ring 53 is an elastic sealing ring, and the third sealing ring 53 is pressed between the oil distribution disc 3 and the outer periphery of the membrane 4. Specifically, the third seal ring 53 is used to seal the fitting gap between the oil distribution pan 3 and the diaphragm 4, preventing leakage of hydraulic oil in the chamber 20.

In one embodiment of the present utility model, a third groove 63 with an opening facing the membrane 4 is provided on the surface of the oil distribution disc 3 near one end of the membrane 4, the third seal ring 53 is accommodated in the third groove 63, and a part of the third seal ring 53 protrudes out of the opening and abuts against the membrane 4.

Specifically, the end surface of the oil distribution disc 3, which is close to the diaphragm 4, is provided with the third groove 63, so that the third sealing ring 53 can be conveniently assembled between the oil distribution disc 3 and the outer periphery of the diaphragm 4 by arranging the third groove 63, and the connection stability of the third sealing ring 53 between the oil distribution disc 3 and the diaphragm 4 is improved. Wherein the third groove 63 has an opening facing the diaphragm 4, and the third seal ring 53 projects from the opening on one axial side thereof and abuts against the diaphragm 4 to form a seal with the diaphragm 4.

The shapes of the grooves of the second groove 62 and the third groove 63 may be set according to practical situations, and the present utility model is not limited thereto.

In one aspect of the utility model, as shown in fig. 4, a second seal ring 52 and a third seal ring 53 are positioned on opposite sides of the diaphragm 4 to seal the gas side and the oil side of the membrane head mechanism, respectively.

In one embodiment of the present utility model, the membrane 4 has a multi-layer structure, and the membrane 4 includes at least an air-side membrane layer 41, an intermediate membrane layer 42, and an oil-side membrane layer 43, which are laminated in this order, from the air-side membrane head 1 to the oil distribution pan 3.

By providing the diaphragm 4 in a multi-layer structure, the strength and durability of the diaphragm 4 can be improved. In a specific example, the membrane 4 includes a gas side membrane layer 41, an intermediate membrane layer 42 and an oil side membrane layer 43 that are sequentially stacked, the gas side membrane layer 41 is close to the gas side membrane head 1, a first seal ring 51 and a second seal ring 52 are disposed between the gas side membrane head 1 and an outer periphery of the gas side membrane layer 41, the oil side membrane layer 43 is close to the oil distribution disc 3, a third seal ring 53 is disposed between the oil distribution disc 3 and an outer periphery of the oil side membrane layer 43, and the intermediate membrane layer 42 is used to partition the air chamber 12 from the cavity 20 when the gas side membrane layer 41 and/or the oil side membrane layer 43 are ruptured, and prevent the air chamber 12 from communicating with the cavity 20.

In one technical scheme of the utility model, as shown in fig. 1 and 5, the air side membrane head 1 comprises a cylinder cover 10 and an air distribution disc 11, wherein the cylinder cover 10 is nested outside the air distribution disc 11 and is in sealing connection with the air distribution disc 11, one axial end of the air distribution disc 11 extends out of the cylinder cover 10, and the membrane 4 is clamped between the extending end of the air distribution disc 11 and the oil distribution disc 3. Wherein the oil distribution pan 3 is omitted in fig. 5 for clarity of illustration of the structure of the air side membrane head 1 and the oil side membrane head 2.

Specifically, the cylinder cover 10 has a hollow structure, is nested outside the air distribution plate 11, and is fixedly connected or detachably connected with the air distribution plate 11 through fastening structures such as bolts, buckles and the like. One end of the air distribution disc 11, which is close to the diaphragm 4, protrudes out of the opening of the cylinder cover 10, the outer periphery of the diaphragm 4 is pressed between the air distribution disc 11 and the oil distribution disc 3, and an air inlet valve port and an air outlet valve port are arranged on the air distribution disc 11.

The surface of the air distribution disc 11 facing the diaphragm 4 is provided with a concave surface and a sealing plane positioned at the outer side of the concave surface, the surface of the oil distribution disc 3 facing the diaphragm 4 is also provided with a concave surface and a sealing plane positioned at the outer side of the concave surface, the concave surface of the air distribution disc 11 and the concave surface of the oil distribution disc 3 are positioned at two opposite sides of the diaphragm 4, and spaces are reserved between the concave surface of the air distribution disc 11 and the diaphragm 4 and between the concave surface of the oil distribution disc 3 and the diaphragm 4 so as to provide deformation spaces for the diaphragm 4 at the air side and the oil side; further, the sealing plane of the distribution disc 11 and the sealing plane of the distribution disc 3 are located at two opposite sides of the outer periphery of the diaphragm 4, the outer periphery of the diaphragm 4 is pressed between the sealing plane of the distribution disc 11 and the sealing plane of the distribution disc 3, a first groove 61 and a second groove 62 which are distributed at intervals are arranged on the sealing plane of the distribution disc 11, the first groove 61 is closer to the concave surface of the distribution disc 11 than the second groove 62, a third groove 63 is arranged on the sealing plane of the distribution disc 3, and the second groove 62 and the third groove 63 are located at two opposite sides of the diaphragm 4, so that the diaphragm 4 is pressed between the air side film head 1 and the oil side film head 2 in a sealing manner.

In one technical scheme of the utility model, as shown in fig. 1 and 5, the oil side membrane head 2 comprises a cylinder sleeve 21 and a cylinder body 22 which are sequentially arranged along the axial direction, a first space 210 penetrating along the axial direction is formed inside the cylinder sleeve 21, the oil distribution disc 3 is embedded in the first space 210, and the extending end of the air distribution disc 11 extends into the first space 210 and is in sealing connection with the cylinder sleeve 21;

the surface of the cylinder 22 near one end of the cylinder liner 21 is provided with a concave part 220 concave towards the direction far away from the cylinder liner 21, the concave part 220 and the first space 210 jointly define a containing cavity 20, a second space 221 penetrating along the axial direction is formed inside the cylinder 22, the second space 221 is communicated with the containing cavity 20, the second space 221 is used for placing a piston, and the piston can reciprocate in the second space 221.

Specifically, the cylinder body 22 is disposed at a side of the cylinder liner 21 away from the cylinder cover 10 and is fixedly connected or detachably connected with the cylinder liner 21 through a fastening structure such as a bolt, a buckle, etc., a first space 210 penetrating along an axial direction is formed inside the cylinder liner 21, a second space 221 penetrating along the axial direction is formed inside the cylinder body 22, the first space 210 is communicated with the second space 221, the oil distribution disc 3 is embedded in the first space 210, and a joint between the oil distribution disc 3 and the cylinder liner 21 is sealed through a sealing member. The extended end of the air distribution plate 11 extends into the first space 210, and the joint of the air distribution plate 11 and the cylinder sleeve 21 is sealed by a sealing element.

The surface of the cylinder 22 near one end of the cylinder liner 21 is provided with a concave portion 220 concave toward a direction away from the cylinder liner 21, the concave portion 220 and the first space 210 together define a cavity 20, and the cavity 20 is used for filling hydraulic oil. A piston may be disposed in the second space 221, and the hydraulic oil is driven to move the diaphragm 4 by the reciprocating motion of the piston in the second space 221, so that the air is pumped in and pushed out.

The specific working process of the membrane head mechanism is as follows:

the chamber 20 is filled with hydraulic oil, and when the power mechanism drives the piston to move leftwards in fig. 1, the internal pressure of the chamber 20 is smaller than the internal pressure of the air chamber 12, and the diaphragm 4 deforms leftwards. The air chamber 12 increases in volume and decreases in internal pressure. At this time, the intake port is opened because the left side pressure is smaller than the right side pressure, and the outlet port is closed because the left side pressure is smaller than the right side pressure. Gas enters the air chamber 12 through the open inlet air. When the power mechanism drives the piston to push the hydraulic oil to move rightwards in fig. 1, the diaphragm 4 deforms rightwards, and the volume of the air cavity 12 is reduced. At this time, the intake port is closed by the left pressure being greater than the right pressure, and the outlet port is opened by the left pressure being greater than the right pressure. The gas in the gas chamber 12 is exhausted through the open outlet port. The operating power mechanism drives the piston to reciprocate in the left-right direction in fig. 1, so that the gas supplied to the air inlet valve port is continuously sucked into the air cavity 12, and the gas sucked into the air cavity 12 is compressed and then discharged. Thus, the gas is continuously conveyed.

In another aspect of the present utility model, the present utility model further provides a diaphragm compressor, including a power mechanism and a membrane head mechanism as described above, where the power mechanism is connected to a piston in the membrane head mechanism, and is used for driving the piston to reciprocate.

In particular, the power mechanism may include a motor in power communication with the piston, the motor driving the piston to reciprocate within the second space. The diaphragm type compressor of the embodiment has the beneficial effects of good sealing performance, high gas transmission performance and high safety by applying the diaphragm head mechanism.

While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential attributes thereof, it should be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims (11)

1. A membrane head mechanism for a diaphragm compressor, comprising:

an air side membrane head;

the oil side membrane head is arranged opposite to the air side membrane head, a containing cavity is formed in one side of the oil side membrane head, which faces the air side membrane head, an oil distribution disc is arranged in the containing cavity, and the oil distribution disc is in sealing fit with the containing cavity;

the outer periphery of the diaphragm is pressed between the air side film head and the oil distribution disc;

the first sealing ring is a metal sealing ring and is tightly pressed between the air side membrane head and the outer periphery of the membrane.

2. The membrane head mechanism according to claim 1, wherein a first groove having an opening is provided on a surface of the gas side membrane head near one end of the membrane, the opening of the first groove faces the membrane, the first seal ring is accommodated in the first groove, and a part of the first seal ring protrudes out of the opening and abuts against the membrane.

3. The membrane head mechanism of claim 2, wherein the protruding height of the first seal ring relative to the opening is 0.06mm to 0.07mm.

4. The membrane head mechanism according to claim 2, wherein a surface of the first seal ring protruding from one end of the opening is provided in a convex arc shape.

5. The membrane head mechanism according to claim 2, wherein an end of the first groove away from the opening is a groove bottom surface, the groove bottom surface being provided in a concave arc shape;

the surface of one end of the first sealing ring, which is close to the bottom surface of the groove, is arranged into a convex arc shape.

6. The membrane head mechanism according to claim 5, wherein the cross section of the first groove comprises a first straight line segment, an arc line segment and a second straight line segment which are sequentially connected, the first straight line segment, the arc line segment and the second straight line segment are sequentially connected to form a U shape, the distance between the first straight line segment and the second straight line segment is equal to the diameter of the first sealing ring, and the diameter of the arc line segment is equal to the diameter of the first sealing ring; the cross section of the first sealing ring is circular.

7. The membrane head mechanism of claim 1, further comprising: the second sealing ring is an elastic sealing ring, is pressed between the air side membrane head and the outer periphery of the membrane, and is closer to the outer periphery of the membrane than the first sealing ring; the surface of the air side membrane head, which is close to one end of the membrane, is provided with a second groove with an opening facing the membrane, the second sealing ring is accommodated in the second groove, and a part of the second sealing ring protrudes out of the opening and is abutted to the membrane.

8. The membrane head mechanism of claim 7, further comprising: the third sealing ring is an elastic sealing ring and is tightly pressed between the oil distribution disc and the outer periphery of the diaphragm; the oil distribution disc is provided with a third groove with an opening facing the diaphragm on the surface of one end, which is close to the diaphragm, of the oil distribution disc, the third sealing ring is accommodated in the third groove, and a part of the third sealing ring protrudes out of the opening and abuts against the diaphragm.

9. The membrane head mechanism of claim 8, wherein the second seal ring and the third seal ring are located on opposite sides of the membrane; and/or the number of the groups of groups,

the membrane is of a multi-layer structure, and at least comprises a gas side membrane layer, an intermediate membrane layer and an oil side membrane layer which are sequentially laminated from the gas side membrane head to the oil distribution disc.

10. The membrane head mechanism according to any one of claims 1 to 7, wherein the gas side membrane head comprises a cylinder cover and a gas distribution disc, the cylinder cover is nested outside the gas distribution disc and is in sealing connection with the gas distribution disc, one axial end of the gas distribution disc extends out of the cylinder cover, and the membrane is clamped between the extending end of the gas distribution disc and the oil distribution disc; and/or the number of the groups of groups,

the oil side membrane head comprises a cylinder sleeve and a cylinder body which are sequentially arranged along the axial direction, a first space penetrating along the axial direction is formed in the cylinder sleeve, the oil distribution disc is embedded in the first space, and the extending end of the air distribution disc extends into the first space and is in sealing connection with the cylinder sleeve;

the cylinder body is close to be equipped with on the surface of the one end of cylinder liner to keeping away from the sunken concave part of direction of cylinder liner, the concave part with first space is limited jointly hold the chamber, the inside of cylinder body is formed with along the second space that the axial runs through, the second space with hold the chamber intercommunication, the second space is used for placing the piston, the piston can be in the second space reciprocating motion.

11. A diaphragm compressor comprising a power mechanism and a diaphragm head mechanism as claimed in any one of claims 1 to 10, the power mechanism being coupled to a piston in the diaphragm head mechanism for driving the piston to reciprocate.

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