CN218913108U

CN218913108U - Compression mechanism

Info

Publication number: CN218913108U
Application number: CN202223286122.0U
Authority: CN
Inventors: 傅珂珂; 舒华勇
Original assignee: Zhejiang Qianji Intelligent Technology Co Ltd
Current assignee: Zhejiang Qianji Intelligent Technology Co Ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-04-25
Anticipated expiration: 2032-12-07
Also published as: WO2024119818A1

Abstract

The utility model relates to a compression mechanism, which comprises a compression cylinder and a piston assembly. The piston assembly is arranged in the compression cavity of the compression cylinder, the piston rod of the piston assembly drives the piston body to reciprocate in the compression cylinder, and when the piston body moves in the direction away from the discharge channel, the medium enters the compression cavity on one side of the piston body, which faces the discharge channel, from the inlet channel. When the piston body is moved in the direction of the discharge channel, the medium can be pressed out through the discharge channel. Because the piston body is provided with the elastic pad towards the one end of discharge channel, when the piston body removes the inner wall butt of discharge channel and compression chamber intercommunication, can utilize the flexible characteristics of elastic pad, further extrude out the medium in the compression chamber, the medium in the compression chamber is arranged as far as, improves the volumetric efficiency of compression mechanism at compression during operation.

Description

Compression mechanism

Technical Field

The utility model relates to the technical field of compression, in particular to a compression mechanism.

Background

The piston is generally disposed in a cylinder of the power unit and is capable of reciprocating in the cylinder to effect suction and discharge of a medium in the cylinder to power the flow of the medium. However, since the piston is used to achieve a compressed discharge of the medium, the piston is in turn a rigid structure, which can result in affecting the volumetric efficiency of the power component in discharging the medium.

Disclosure of Invention

In view of the above, it is necessary to provide a compression mechanism capable of effectively improving the volumetric efficiency at the time of compression operation.

The compression mechanism comprises a compression cylinder and a piston assembly, wherein a compression cavity is formed in the compression cylinder, an inlet channel and an outlet channel are formed in the compression cylinder, and the inlet channel and the outlet channel are communicated with the compression cavity; the piston assembly comprises a piston body and a piston rod, wherein the piston body is arranged in the compression cavity, an elastic pad is arranged at one end of the piston body, which faces the discharge channel, one end of the piston rod is connected to the piston body, and the piston rod can drive the piston body to reciprocate, so that a medium enters the compression cavity from the inlet channel and is extruded through the discharge channel.

In one embodiment, an installation groove is formed in the end face, facing the discharge channel, of the piston body, an installation portion is arranged on the elastic pad, and the installation portion is clamped in the installation groove.

In one embodiment, the end face of the piston rod is provided with a containing groove, the mounting groove is formed in the bottom wall of the containing groove, an annular clamping groove is formed in the inner wall of the mounting groove, an annular clamping protrusion is formed on the outer wall of the mounting part, the mounting part is arranged in the mounting groove so that the annular clamping protrusion is arranged in the annular clamping groove, and the elastic pad is partially located in the containing groove.

In one embodiment, the mounting portion is integrally formed on the elastic pad, the annular clamping protrusion is integrally formed on the outer wall of the mounting portion, and the mounting portion, the annular clamping protrusion and the elastic pad are all elastic deformable bodies.

In one embodiment, the surface of the elastic pad facing away from the piston body is provided with a plurality of deformation grooves; and/or

In one embodiment, the elastic pads are arranged on two opposite ends of the piston body.

In one embodiment, the elastic pad is a high temperature resistant rubber pad.

In one embodiment, the piston assembly further comprises a matching ring and a locking piece, the piston body is provided with a connecting hole, the matching ring is arranged in the connecting hole in a penetrating manner, one end of the piston rod is arranged in the matching ring in a penetrating manner, and the locking piece is arranged on the piston body and locks the piston rod; and/or

In one embodiment, an annular groove is formed on the outer wall of the piston body and is arranged around the circumference, and a gray ring is arranged in the annular groove.

In one embodiment, the compression mechanism further comprises a valve assembly, the valve assembly comprises a valve block and a valve plate, the valve plate comprises a connecting portion and a discharging portion connected with the connecting portion, the discharging portion is abutted to the outlet of the discharging channel away from the compression cavity, the valve block is arranged on one side, opposite to the discharging channel, of the valve plate and is connected with the connecting portion, and a limiting inclined plane is formed on the side face, opposite to the discharging portion, of the valve block, so that the limiting inclined plane is arranged at intervals with the discharging portion.

In one embodiment, two inlet channels and two outlet channels are formed on the compression cylinder, wherein one inlet channel is communicated with one outlet channel and the compression cavity on one side of the piston body, the other inlet channel is communicated with the other outlet channel and the compression cavity on the other side opposite to the piston body, and each outlet channel is correspondingly provided with one valve assembly.

In one embodiment, the compression cylinder includes a cylinder body, a first member and a second member, the compression chamber is formed in the cylinder body, and one side of the cylinder body is open, the first member is disposed at the open side of the cylinder body, and the intake passage and the discharge passage are both formed on the first member, a first discharge chamber communicating with the discharge passage is formed on the first member, and a valve assembly is disposed in the first discharge chamber and at the discharge passage communicating with the first discharge chamber;

the cylinder comprises a cylinder body, a first member, a second member, a valve assembly and a valve assembly, wherein the cylinder body is provided with an opening, the opening is provided with a side wall opposite to the opening, the side wall opposite to the opening is provided with another inlet channel and another outlet channel, the second member is arranged on one side of the cylinder body opposite to the first member, an inlet cavity and a second outlet cavity are formed in the second member, the inlet cavity is communicated with the other inlet channel, the second outlet cavity is communicated with the other outlet channel, and the valve assembly is arranged in the second outlet cavity and is arranged at the outlet channel communicated with the second outlet cavity.

When the compression mechanism is used, the piston assembly is arranged in the compression cavity of the compression cylinder, the piston rod of the piston assembly drives the piston body to reciprocate in the compression cylinder, and when the piston body moves in the direction away from the discharge channel, a medium enters the compression cavity on one side of the discharge channel from the inlet channel. When the piston body is moved in the direction of the discharge channel, the medium can be pressed out through the discharge channel. Because the piston body is provided with the elastic pad towards the one end of discharge channel, when the piston body removes the inner wall butt of discharge channel and compression chamber intercommunication, can utilize the flexible characteristics of elastic pad, further extrude out the medium in the compression chamber, the medium in the compression chamber is arranged as far as, improves the volumetric efficiency of compression mechanism at compression during operation.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Moreover, the figures are not drawn to a 1:1 scale, and the relative sizes of various elements are merely exemplary in the figures, and are not necessarily drawn to true scale. In the drawings:

FIG. 1 is a schematic view of a partial structure of a compression mechanism in an embodiment;

FIG. 2 is a cross-sectional view of the compression mechanism shown in FIG. 1;

FIG. 3 is a schematic illustration of the piston assembly of FIG. 2;

FIG. 4 is an exploded view of the piston assembly shown in FIG. 3;

FIG. 5 is a side view of the valve assembly of FIG. 2;

fig. 6 is an exploded view of the compression cylinder of fig. 1.

Reference numerals illustrate:

10. a compression mechanism; 100. a compression cylinder; 110. a compression chamber; 120. entering the channel; 122. a discharge passage; 130. a cylinder body; 140. a first member; 142. a first discharge chamber; 144. a mounting cavity; 146. a communication hole; 150. a second member; 151. entering the cavity; 152. a second discharge chamber; 200. a piston assembly; 210. a piston body; 211. a mounting groove; 212. a receiving groove; 213. a connection hole; 214. an annular groove; 220. a piston rod; 230. an elastic pad; 231. a deformation groove; 232. a mounting part; 240. a mating ring; 250. a locking member; 260. a Gelai circle; 300. a valve assembly; 310. a valve block; 312. limiting inclined planes; 320. a valve plate; 321. a connection part; 322. and a discharge unit.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1 and 2, a compression mechanism 10 in one embodiment is capable of compressing a medium to power the flow of the medium. In this embodiment, the compression mechanism 10 is used to effect compression of the gas to power the flow of the gas. In other embodiments, the compression mechanism 10 may also be used to effect compression of a gas-liquid mixing medium or the like.

In one embodiment, the compression mechanism 10 includes a compression cylinder 100 and a piston assembly 200, a compression chamber 110 is formed in the compression cylinder 100, and an intake passage 120 and an exhaust passage 122 (as shown in fig. 6) are formed in the compression cylinder 100, and the intake passage 120 and the exhaust passage 122 are both in communication with the compression chamber 110; the piston assembly 200 includes a piston body 210 and a piston rod 220, the piston body 210 is disposed in the compression chamber 110, an elastic pad 230 is disposed at one end of the piston body 210 facing the discharge channel 122, one end of the piston rod 220 is connected to the piston body 210, and the piston rod 220 can drive the piston body 210 to reciprocate, so that a medium enters the compression chamber 110 from the inlet channel 120 and is extruded through the discharge channel 122.

In use, the piston assembly 200 is disposed in the compression chamber 110 of the compression cylinder 100, and the piston rod 220 of the piston assembly 200 drives the piston body 210 to reciprocate in the compression cylinder 100, so that when the piston body 210 moves away from the discharge passage 122, the medium enters the compression chamber 110 of the piston body 210 toward the discharge passage 122 from the inlet passage 120. When the piston body 210 is moved in the direction of the discharge channel 122, the medium can be pressed out through the discharge channel 122. Because the elastic pad 230 is disposed at one end of the piston body 210 facing the discharge channel 122, when the piston body 210 moves to the inner wall of the discharge channel 122 communicating with the compression chamber 110, the deformable characteristic of the elastic pad 230 can be utilized to further squeeze out the medium in the compression chamber 110, so as to drain the medium in the compression chamber 110 as much as possible, and improve the volumetric efficiency of the compression mechanism 10 during compression operation.

Referring to fig. 2, 3 and 4, in an embodiment, a plurality of deformation grooves 231 are formed on a surface of the elastic pad 230 facing away from the piston body 210. Since the elastic pad 230 can abut against the inner wall of the compression chamber 110 where the discharge passage 122 is formed during compression, the elastic pad 230 is deformed during compression. The deformation degree of the elastic pad 230 can be improved by arranging the deformation groove 231, so that the deformation allowance is provided for the deformation of the elastic pad 230, the medium in the compression cavity 110 is further ensured to be discharged, and the volumetric efficiency of the compression mechanism 10 is ensured to be improved.

Specifically, the elastic pad 230 has a disc shape, and a plurality of deformation grooves 231 are spaced around the center line of the elastic pad 230. Further, the two adjacent deformation grooves 231 are communicated through a communication groove, so as to further ensure the deformation allowance of the elastic pad 230 in the extrusion deformation process.

In one embodiment, the end surface of the piston body 210 facing the discharge channel 122 is provided with a mounting groove 211, the elastic pad 230 is provided with a mounting portion 232, and the mounting portion 232 is clamped in the mounting groove 211. By providing the mounting portion 232 and the mounting groove 211, the reliability of mounting the elastic pad 230 on the piston body 210 can be ensured.

In one embodiment, the end surface of the piston rod 220 is provided with a receiving groove 212, the mounting groove 211 is provided on the bottom wall of the receiving groove 212, and a portion of the elastic pad 230 is located in the receiving groove 212. When the mounting portion 232 is clamped in the mounting groove 211, the elastic pad 230 can be partially located in the accommodating groove 212, so that the stability of the elastic pad 230 on the piston body 210 can be further ensured.

In one embodiment, an annular clamping groove is formed on the inner wall of the mounting groove 211, an annular clamping protrusion is formed on the outer wall of the mounting portion 232, and the mounting portion 232 is disposed in the mounting groove 211 so that the annular clamping protrusion is disposed in the annular clamping groove. The annular clamping protrusion and the annular clamping groove can effectively limit the elastic pad 230 to move towards the direction away from the piston body 210. In other embodiments, the mounting portion 232 may be hooked on the inner wall of the mounting groove 211 by a hook structure.

In one embodiment, the mounting portion 232 is integrally formed on the elastic pad 230, the annular clamping protrusion is integrally formed on the outer wall of the mounting portion 232, and the mounting portion 232, the annular clamping protrusion and the elastic pad 230 are all elastically deformable bodies. By integrally molding the mounting portion 232, the annular click protrusion, and the elastic pad 230 together, the reliability of connection between the respective components can be improved, and the process can be simplified.

In one embodiment, the elastic pad 230 is a high temperature resistant rubber pad. The high temperature resistant rubber pad can not only ensure the deformation of the elastic pad 230, but also ensure the reliability of operation in a high temperature environment. In other embodiments, the elastic pad 230 may be made of other deformable elastic materials.

In an embodiment, the piston assembly 200 further includes a mating ring 240 and a locking member 250, the piston body 210 is provided with a connecting hole 213, the mating ring 240 is disposed in the connecting hole 213 in a penetrating manner, one end of the piston rod 220 is disposed in the mating ring 240 in a penetrating manner, and the locking member 250 is mounted on the piston body 210 and locks the piston rod 220. Since the piston rod 220 is connected to the piston body 210 through the mating ring 240, direct contact between the piston rod 220 and the piston body 210 is avoided, and deformation of the piston body 210 caused by the force of the piston rod 220 acting on the piston body 210 can be reduced.

In this embodiment, the locking member 250 may be a bolt, the head of the bolt abuts against the piston body 210, and the rod portion of the bolt passes through the mating ring 240 and is disposed in the piston rod 220, so as to connect the piston body 210 and the piston rod 220.

In one embodiment, an annular groove 214 is formed on the outer wall of the piston body 210, and a gurley 260 is disposed in the annular groove 214. Specifically, the gurley ring 260 includes an O-ring and a polytetrafluoroethylene ring, and the polytetrafluoroethylene ring is sleeved outside the O-ring. The polytetrafluoroethylene ring is a self-lubricating material and can reduce friction with the inner wall of the compression chamber 110. When polytetrafluoroethylene ring wearing and tearing, the O type circle can play certain compensation effect, guarantees sealed effect, increase of service life.

In other embodiments, the annular groove 214 may be provided with only a sealing ring, as long as the sealing effect between the piston body 210 and the inner wall of the compression chamber 110 can be ensured.

Referring to fig. 2 and 5, in an embodiment, the compression mechanism 10 further includes a valve assembly 300, the valve assembly 300 includes a valve block 310 and a valve plate 320, the valve plate 320 includes a connection portion 321 and a discharge portion 322 connected to the connection portion 321, the discharge portion 322 is abutted to an outlet of the discharge passage 122 away from the compression chamber 110, the valve block 310 is disposed on a side of the valve plate 320 facing away from the discharge passage 122 and connected to the connection portion 321, and a side of the valve block 310 opposite to the discharge portion 322 forms a limiting inclined surface 312, so that the limiting inclined surface 312 is spaced from the discharge portion 322.

Because the spacing inclined plane 312 and the discharge portion 322 are disposed at intervals, when the medium is discharged, the medium can push the discharge portion 322 of the valve plate 320 toward the spacing inclined plane 312 of the valve block 310 through the discharge channel 122, so that the discharge portion 322 abuts against the spacing inclined plane 312, and the discharge portion 322 is further released from sealing the discharge channel 122, so that the medium can be discharged. When the air discharge is completed, the discharge portion 322 restores the cover of the discharge passage 122 by the self elastic force of the valve sheet 320. Since the discharge portion 322 can be attached to the limiting inclined surface 312 after being elastically deformed in the process of discharge, the limiting inclined surface 312 can play a role in limiting and supporting the discharge portion 322, and further the service life of the valve plate 320 can be prolonged.

Referring to fig. 1 and 2, in one embodiment, two inlet channels 120 and two outlet channels 122 are formed on the compression cylinder 100, wherein one inlet channel 120 and one outlet channel 122 are communicated with the compression chamber 110 on one side of the piston body 210, and the other inlet channel 120 and the other outlet channel 122 are communicated with the compression chamber 110 on the other side opposite to the piston body 210.

In use, when the piston body 210 is compressed to one side, the side discharges the medium and the other side medium enters, and conversely, when the piston body 210 is compressed to the other side, the side discharges the medium and the one side medium enters. By providing two inlet channels 120 and two outlet channels 122, bi-directional work compression can be achieved, so that the reciprocating movement of the piston body 210 in both directions can achieve work.

Specifically, each of the discharge passages 122 is provided with one of the valve assemblies 300. Reliability of medium discharge is ensured by providing the valve assembly 300.

In one embodiment, the opposite ends of the piston body 210 are provided with elastic pads 230. Since the piston body 210 moves in both directions to perform work, the two elastic pads 230 face the two discharge channels 122 respectively, and the volumetric efficiency of work compression at both sides is further ensured.

Referring to fig. 1, 2 and 6, in one embodiment, a compression cylinder 100 includes a cylinder body 130, a first member 140 and a second member 150, a compression chamber 110 is formed in the cylinder body 130, and one side of the cylinder body 130 is opened, the first member 140 is disposed at the opened side of the cylinder body 130, and an intake passage 120 and a discharge passage 122 are formed on the first member 140, a first discharge chamber 142 communicating with the discharge passage 122 is formed on the first member 140, and a valve assembly 300 is disposed in the first discharge chamber 142 and at the discharge passage 122 communicating with the first discharge chamber 142. The piston body 210 can be disposed in the compression chamber 110 through the open side of the cylinder body 130, and the first discharge chamber 142 in the first member 140 can provide an installation space for the disposition of the valve assembly 300.

Specifically, the side of the first member 140 facing away from the cylinder body 130 is further provided with a mounting cavity 144, and the first member 140 is further provided with a communication hole 146, the communication hole 146 communicates the compression cavity 110 and the mounting cavity 144, and one end of the piston rod 220, which is far away from the piston body 210, passes through the communication hole 146 and is disposed in the mounting cavity 144.

In this embodiment, the compression mechanism 10 further includes a power assembly disposed in the mounting cavity 144 and connected to the piston rod 220, and the power assembly is used to drive the piston rod 220 to reciprocate, so as to implement the reciprocating movement of the piston body 210 in the compression cavity 110.

In one embodiment, the side wall of the cylinder body 130 opposite to the opening is provided with another inlet channel 120 and another outlet channel 122, the second member 150 is disposed on one side of the cylinder body 130 opposite to the first member 140, an inlet cavity 151 and a second outlet cavity 152 are formed in the second member 150, the inlet cavity 151 communicates with the other inlet channel 120, the second outlet cavity 152 communicates with the other outlet channel 122, and the other valve assembly 300 is disposed in the second outlet cavity 152 and at the outlet channel 122 communicating with the second outlet cavity 152. The installation of the further valve assembly 300 is facilitated by the provision of the second member 150, ensuring the stability of the discharge of the medium through the further discharge channel 122.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims

1. A compression mechanism, the compression mechanism comprising:

the compression cylinder is internally provided with a compression cavity, an inlet channel and an outlet channel are formed on the compression cylinder, and the inlet channel and the outlet channel are communicated with the compression cavity; a kind of electronic device with high-pressure air-conditioning system

The piston assembly comprises a piston body and a piston rod, wherein the piston body is arranged in the compression cavity, an elastic pad is arranged at one end of the piston body, which faces the discharge channel, one end of the piston rod is connected to the piston body, and the piston rod can drive the piston body to reciprocate, so that a medium enters the compression cavity from the inlet channel and is extruded through the discharge channel.

2. The compression mechanism of claim 1, wherein a mounting groove is formed in an end surface of the piston body facing the discharge passage, and a mounting portion is provided on the elastic pad and is engaged in the mounting groove.

3. The compression mechanism of claim 2, wherein an accommodating groove is formed in an end face of the piston rod, the mounting groove is formed in a bottom wall of the accommodating groove, an annular clamping groove is formed in an inner wall of the mounting groove, an annular clamping protrusion is formed on an outer wall of the mounting portion, the mounting portion is arranged in the mounting groove so that the annular clamping protrusion is arranged in the annular clamping groove, and a part of the elastic pad is positioned in the accommodating groove.

4. A compression mechanism as claimed in claim 3 wherein the mounting portion is integrally formed on the resilient pad, the annular clamping projection is integrally formed on the outer wall of the mounting portion, and the mounting portion, the annular clamping projection and the resilient pad are all resiliently deformable bodies.

5. The compression mechanism of any one of claims 1-4, wherein the surface of the elastic pad facing away from the piston body is provided with a plurality of deformation grooves; and/or

The elastic pads are arranged at two opposite ends of the piston body.

6. The compression mechanism of any one of claims 1-4, wherein the resilient pad is a high temperature resistant rubber pad.

7. The compression mechanism of any one of claims 1-4, wherein the piston assembly further comprises a mating ring and a locking member, the piston body is provided with a connecting hole, the mating ring is inserted into the connecting hole, one end of the piston rod is inserted into the mating ring, and the locking member is mounted on the piston body and locks the piston rod; and/or

An annular groove which is arranged around the circumferential direction is formed in the outer wall of the piston body, and a Gelai ring is arranged in the annular groove.

8. The compression mechanism of any one of claims 1-4, further comprising a valve assembly, the valve assembly comprising a valve block and a valve plate, the valve plate comprising a connecting portion and a discharge portion connected to the connecting portion, the discharge portion abutting an outlet of the discharge passage away from the compression chamber, the valve block being disposed on a side of the valve plate facing away from the discharge passage and connected to the connecting portion, the valve block being formed as a limiting ramp on a side of the discharge portion such that the limiting ramp is disposed in spaced relation to the discharge portion.

9. The compression mechanism of claim 8, wherein two intake passages and two discharge passages are formed in the compression cylinder, one of the intake passages and one of the discharge passages being in communication with the compression chamber on one side of the piston body, the other intake passage and the other discharge passage being in communication with the compression chamber on the other side of the piston body opposite the piston body, each of the discharge passages being provided with a corresponding one of the valve assemblies.

10. The compression mechanism of claim 9, wherein the compression cylinder includes a cylinder body, a first member and a second member, the compression chamber is formed in the cylinder body, and one side of the cylinder body is open, the first member is disposed on an open side of the cylinder body, and both the intake passage and the discharge passage are formed on the first member, a first discharge chamber communicating with the discharge passage is formed on the first member, and the valve assembly is disposed in the first discharge chamber and at the discharge passage communicating with the first discharge chamber;