CN219061924U - Middle body structure and reciprocating compressor - Google Patents

Abstract

The application discloses a midbody structure and reciprocating compressor relates to the compression equipment field. A mesostructure comprising: the middle body, the first sealing component, the second sealing component and the third sealing component; the middle body comprises a first isolation chamber and a second isolation chamber, the first isolation chamber is communicated with the second isolation chamber through a first channel, a second channel is arranged on one side, away from the second isolation chamber, of the first isolation chamber, the second channel is communicated with the first isolation chamber and the crankcase, a third channel is arranged on one side, away from the first isolation chamber, of the second isolation chamber, and the third channel is communicated with the second isolation chamber and the cylinder; the first sealing component is connected between the first channel and the piston rod in a sealing way, the second sealing component is connected between the second channel and the piston rod in a sealing way, and the third sealing component is connected between the third channel and the piston rod in a sealing way. A reciprocating compressor comprises the above-mentioned intermediate structure. The application can solve the problem of insufficient tightness and the like.

Description

Middle body structure and reciprocating compressor

Technical Field

The application belongs to the technical field of compression equipment, and particularly relates to a middle body structure and a reciprocating compressor.

Background

In the process of generating natural gas, hydrogen sulfide is easy to accompany, the hydrogen sulfide is the poisonous gas with the greatest harm in the natural gas exploitation, the extremely strong corrosiveness and the extremely high leakage lethal risk are provided, and the risk of corrosion and leakage of the compressor in the process of pressurizing the natural gas containing the hydrogen sulfide is caused.

Some current reciprocating compressors, due to insufficient tightness, are prone to leakage of gas from the cylinder to the middle body and from the middle body to the crankcase, causing damage to parts in the crankcase and environmental pollution caused by emission of gas into the air through the crankcase.

Disclosure of Invention

The embodiment of the application aims to provide a middle body structure and a reciprocating compressor, which can solve the problems that the pollution and the danger are caused by the fact that hydrogen sulfide leaks to a crankcase and is discharged into the atmosphere due to insufficient sealing performance, parts in the crankcase are corroded, and the like.

In order to solve the technical problems, the application is realized as follows:

the embodiment of the application provides a middle body structure which is applied to a reciprocating compressor, wherein the reciprocating compressor comprises a crankcase, a cylinder and a piston rod;

the intermediate structure comprises: the middle body, the first sealing component, the second sealing component and the third sealing component;

the middle body comprises a first isolation chamber and a second isolation chamber, the first isolation chamber is communicated with the second isolation chamber through a first channel, a second channel is arranged on one side of the first isolation chamber, which is away from the second isolation chamber, and is used for communicating the first isolation chamber with the crankcase, a third channel is arranged on one side of the second isolation chamber, which is away from the first isolation chamber, and is used for communicating the second isolation chamber with the cylinder, and the second channel, the first channel and the third channel are respectively used for penetrating through the piston rod;

the first sealing component is connected between the first channel and the piston rod in a sealing mode, the second sealing component is connected between the second channel and the piston rod in a sealing mode, and the third sealing component is connected between the third channel and the piston rod in a sealing mode.

The embodiment of the application also provides a reciprocating compressor which comprises the middle body structure.

In the embodiment of the application, the middle body comprises a first isolation chamber and a second isolation chamber, the first isolation chamber and the second isolation chamber are communicated through a first channel, and the piston rod and the first channel are sealed through a first sealing assembly, so that the first isolation chamber and the second isolation chamber can be isolated; the first isolation chamber is communicated with the crankcase through a second channel, and the piston rod is sealed with the second channel through a second sealing assembly, so that the first isolation chamber and the crankcase can be isolated; the second isolation chamber is communicated with the air cylinder through a third channel, and the piston rod is sealed with the third channel through a third sealing assembly, so that the second isolation chamber can be isolated from the air cylinder. Based on this, third seal assembly, first seal assembly and second seal assembly are located between cylinder and the crankcase in proper order, thereby realized multiple protection through three seals, in order to furthest prevent to get into the crankcase by the natural gas that contains hydrogen sulfide that the cylinder leaked in proper order through second isolation room and first isolation room, and then can effectively alleviate the natural gas that contains hydrogen sulfide and directly discharge to the atmosphere through the crankcase in and lead to atmospheric pollution or harm the problem of personal health, and can also effectively alleviate the natural gas that contains hydrogen sulfide and get into in the crankcase and cause the corruption to inside spare part, guaranteed the life of crankcase. In addition, the first sealing component is arranged in the first channel between the first isolation chamber and the second isolation chamber, so that a certain supporting effect can be achieved on the piston rod, the piston rod can be guaranteed to move linearly along the axial direction to a certain extent, abrasion of the sealing components due to inclination of the piston rod can be reduced, and the problem of leakage due to abrasion of the sealing components can be relieved to the greatest extent.

Drawings

FIG. 1 is a schematic view of a reciprocating compressor disclosed in an embodiment of the present application;

fig. 2 is a schematic view of an assembly of a piston rod, a first seal assembly, a second seal assembly, and a third seal assembly according to an embodiment of the present application.

Reference numerals illustrate:

100-mesostructure; 110-a midbody body; 111-a first isolation chamber; 112-a second isolation chamber; 113-a first annular protrusion; 114-a second annular protrusion; 115-a third annular protrusion; 116-air inlet; 117-exhaust port; 118-a drain outlet; 120-fixing ring; 130-a first fixing seat; 131-first channel; 140-a second fixing seat; 141-a second channel; 150-a third fixing seat; 151-a third channel; 160-a first connecting line; 170-a second connecting line; 180-load cell; 190-a temperature measuring element;

210-a first seal assembly; 220-a second seal assembly; 230-a third seal assembly; 231-gas channel;

300-crankcase;

400-cylinder;

500-piston rod;

600-separation device;

700-a dirt collecting device;

800-vacuum pump.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings by means of specific embodiments and application scenarios thereof.

Referring to fig. 1 to 2, an embodiment of the present application discloses a middle body structure 100 applied to a reciprocating compressor, wherein the reciprocating compressor may include a crankcase 300, a cylinder 400, a piston rod 500, etc., wherein the crankcase 300 may include a case and a crankshaft disposed in the case, and the crankshaft may be driven to rotate by a power member; the crankshaft is connected with the piston rod 500 through a connecting rod, and when the crankshaft rotates, the piston rod 500 can be driven by the connecting rod to reciprocate, so that the compression process is realized. An end of the piston rod 500 remote from the crankshaft extends into the cylinder 400, and gas in the cylinder 400 may be compressed during the reciprocating movement of the piston rod 500 to pressurize the gas. The middle body structure 100 is disposed between the crankcase 300 and the cylinder 400 to connect the crankcase 300 and the cylinder 400 together, and may separate the crankcase 300 and the cylinder 400 to alleviate the problem of gas leaking from the cylinder 400 directly entering the crankcase 300. In practice, the piston rod 500 extends from the crankcase 300 through the central body structure 100 to the cylinder 400 in order to achieve compression of the gas in the cylinder 400 by a reciprocating motion.

In some cases, the reciprocating compressor is applied to the natural gas generating process, and the natural gas may be mixed with toxic gases such as hydrogen sulfide, and when the natural gas leaks in the compression process, the contained hydrogen sulfide leaks, so that environmental pollution is caused, and the hydrogen sulfide also has a corrosion effect, and when the hydrogen sulfide enters the crankcase 300, the hydrogen sulfide easily damages parts in the crankcase 300, and influences the service life of the crankcase 300.

The disclosed midbody structure 100 includes a midbody body 110, a first seal assembly 210, a second seal assembly 220, and a third seal assembly 230. Wherein the middle body 110 may include a first isolation chamber 111 and a second isolation chamber 112, and in particular, the first isolation chamber 111 and the second isolation chamber 112 are disposed side by side along an extension direction of the piston rod 500. In order to pass through the piston rod 500, the first isolation chamber 111 is communicated with the second isolation chamber 112 through the first channel 131, and a second channel 141 is arranged on one side of the first isolation chamber 111, which is away from the second isolation chamber 112, the second channel 141 is used for communicating the first isolation chamber 111 with the crankcase 300, a third channel 151 is arranged on one side of the second isolation chamber 112, which is away from the first isolation chamber 111, the third channel 151 is used for communicating the second isolation chamber 112 with the cylinder 400, so that the piston rod 500 can sequentially pass through the second channel 141, the first channel 131 and the third channel 151, and the piston rod 500 can be ensured to extend from the crankcase 300 to the cylinder 400, and the reciprocating motion of the piston rod 500 is realized.

Considering that there is a dynamic and static combination between the piston rod 500 and the inner wall of each of the three passages, there may be a gap, and it is easy to leak the gas in the cylinder 400 through the gap between the inner wall of the third passage 151 and the outer wall of the piston rod 500 during the compression of the gas. Based on this, in order to improve the tightness between the inner wall of the third channel 151 and the outer wall of the piston rod 500, in this embodiment of the present application, a third sealing assembly 230 is added, and the third sealing assembly 230 is connected between the third channel 151 and the piston rod 500 in a sealing manner, so that a gap between the inner wall of the third channel 151 and the outer wall of the piston rod 500 can be plugged, so as to ensure that the gas in the cylinder 400 cannot leak into the second isolation chamber 112 under the pressure effect as much as possible.

Illustratively, the third sealing assembly 230 may include a plurality of sealing rings, etc. sequentially disposed along the extension direction of the piston rod 500 to form multiple seals between the cylinder 400 and the second isolation chamber 112 to improve sealability therebetween; in addition, the third sealing assembly 230 may further include a gas sealing assembly (i.e., a packing sealing group described later) to seal by a pressure gas, for example, high-pressure nitrogen gas is introduced between the third passage 151 and the piston rod 500, and the pressure of the nitrogen gas is greater than that of the leakage gas, so that the gas leakage in the cylinder 400 may be blocked by the high-pressure nitrogen gas.

In some cases, the third sealing assembly 230 may be aged, damaged, etc. with the long-term operation of the reciprocating compressor, thereby causing the third sealing assembly 230 to be insufficient to completely seal the gap between the third passage 151 and the piston rod 500, resulting in leakage of gas in the cylinder 400 into the second isolation chamber 112.

In order to prevent leaked gas from entering the first isolation chamber 111 and even entering the crankcase 300 through the first isolation chamber 111, the embodiment of the application further adds a first sealing assembly 210, where the first sealing assembly 210 is connected between the first channel 131 and the piston rod 500 in a sealing manner, so that a gap between an inner wall of the first channel 131 and an outer wall of the piston rod 500 can be plugged, so that the gas in the second isolation chamber 112 is prevented from leaking into the first isolation chamber 111 as much as possible, and the gas is prevented from entering the crankcase 300.

Illustratively, the first sealing assembly 210 may include a plurality of sealing rings, etc. sequentially disposed along the extension direction of the piston rod 500 to form multiple seals between the first and second isolation chambers 111 and 112 to improve sealability therebetween.

Meanwhile, since the length of the piston rod 500 is large, micro deformation, tilting, etc. are easily generated during the reciprocating motion, thereby causing the sealing portion to be easily biased, and for a long time, the sealing portion is disabled, resulting in gas leakage. Based on this, through setting up first seal assembly 210, can also play certain supporting role to the middle part region of piston rod 500 to a certain extent, thereby can improve the overall rigidity of piston rod 500, in order to alleviate piston rod 500 and receive the load and produce the condition of micro-deformation, and still increased direction, the restriction effect to piston rod 500, in order to guarantee piston rod 500 along rectilinear motion, consequently, can alleviate the wearing and tearing condition between piston rod 500 and the sealing part, alleviate the eccentric wear problem, and then can guarantee sealing part's life, and alleviate the gas leakage problem.

In other cases, the first sealing assembly 210 may be aged, damaged, etc. with the long-term operation of the reciprocating compressor, resulting in the first sealing assembly 210 not sufficiently sealing the gap between the first passage 131 and the piston rod 500, thereby causing leakage gas in the second isolation chamber 112 to enter the first isolation chamber 111.

In order to prevent leaked gas from entering the crankcase 300, the embodiment of the present application further adds a second sealing assembly 220, where the second sealing assembly 220 is sealingly disposed between the second channel 141 and the piston rod 500, so as to seal a gap between an inner wall of the second channel 141 and an outer wall of the piston rod 500, so as to ensure that the gas in the first isolation chamber 111 cannot leak into the crankcase 300 as much as possible.

Illustratively, the second sealing assembly 220 may include a plurality of sealing rings, etc. sequentially disposed along the extension direction of the piston rod 500 to form multiple seals between the first isolation chamber 111 and the crankcase 300 to improve sealability therebetween. In addition, the second sealing assembly 220 may further include an oil seal assembly to seal with oil, and may also lubricate the piston rod 500.

In this embodiment, the middle body 110 includes a first isolation chamber 111 and a second isolation chamber 112, which are communicated through a first channel 131, and a piston rod 500 and the first channel 131 are sealed by a first sealing component 210, so that the first isolation chamber 111 and the second isolation chamber 112 can be isolated; the first isolation chamber 111 is communicated with the crankcase 300 through the second channel 141, and the piston rod 500 is sealed with the second channel 141 through the second sealing assembly 220, so that the first isolation chamber 111 and the crankcase 300 can be isolated; the second isolation chamber 112 is communicated with the cylinder 400 through the third channel 151, and the piston rod 500 is sealed with the third channel 151 through the third sealing assembly 230, so that the second isolation chamber 112 and the cylinder 400 can be isolated. Based on this, the third sealing assembly 230, the first sealing assembly 210 and the second sealing assembly 220 are sequentially located between the cylinder 400 and the crankcase 300, thereby realizing various protections through three seals, preventing the natural gas containing hydrogen sulfide leaked from the cylinder 400 from entering the crankcase 300 sequentially through the second isolation chamber 112 and the first isolation chamber 111 to the maximum extent, further effectively alleviating the problem that the natural gas containing hydrogen sulfide is directly discharged to the atmosphere through the crankcase 300 to cause atmospheric pollution or harm to human health, and also effectively alleviating the problem that the natural gas containing hydrogen sulfide enters the crankcase 300 to corrode internal parts, thereby guaranteeing the service life of the crankcase 300.

In addition, the first sealing assembly 210 disposed in the first channel 131 between the first isolation chamber 111 and the second isolation chamber 112 can also play a role in supporting the piston rod 500 to a certain extent, so that the piston rod 500 can be ensured to move linearly in the axial direction, and thus the abrasion of each sealing assembly due to the inclination of the piston rod 500 can be reduced, and the leakage problem due to the abrasion of the sealing assemblies can be further alleviated to the maximum extent.

In some embodiments, the middle body structure 100 may further include a fixing ring 120 and a first fixing base 130, wherein the inner wall of the middle body 110 may be provided with a first annular protrusion 113, the fixing ring 120 is connected to the first annular protrusion 113, the first fixing base 130 is connected to the fixing ring 120, and the first fixing base 130 is provided with a first channel 131.

As an example, a central region of the middle body 110 along the extension direction of the piston rod 500 may be provided with a circle of first annular protrusions 113, and an axis of the first annular protrusions 113 is parallel to the extension direction of the piston rod 500. The first annular protrusion 113 may be fixed to the inner wall of the middle body 110, for example, by welding, bonding, or the like, and of course, the first annular protrusion 113 may also be integrally formed with the middle body 110, for example, integrally cast, machined, or the like. Of course, the above-mentioned various ways can ensure the firmness between the first annular protrusion 113 and the middle body 110, so as to avoid the first annular protrusion 113 from separating from the middle body 110.

The first annular protrusion 113 may have a plurality of first fixing holes, and correspondingly, the fixing ring 120 may also have a plurality of second fixing holes, where the plurality of second fixing holes and the plurality of first fixing holes are respectively disposed opposite to each other when the fixing ring 120 is installed, and then fastening bolts or fastening screws are respectively inserted into the second fixing holes, so as to firmly fix the fixing ring 120 on the first annular protrusion 113.

Optionally, a first annular recess is provided at the edge of the end face of the fixing ring 120 facing away from the cylinder 400, into which first annular recess at least part of the first annular projection 113 is embedded when the fixing ring 120 is mounted to the first annular projection 113. With this arrangement, the mounting firmness and the sealing property between the fixing ring 120 and the first annular projection 113 can be ensured to prevent the leaking gas in the second isolation chamber 112 from entering the first isolation chamber 111.

The first fixing seat 130 may have a plurality of third fixing holes, and correspondingly, the fixing ring 120 may also have a plurality of fourth fixing holes, where the plurality of third fixing holes and the plurality of fourth fixing holes are respectively disposed opposite to each other when the first fixing seat 130 is installed, and then fastening bolts or fastening screws are respectively inserted into the plurality of third fixing holes and the plurality of fourth fixing holes, so as to firmly fix the first fixing seat 130 on the fixing ring 120.

Optionally, a second annular recess is provided at the edge of the end surface of the first fixing seat 130 facing away from the crankcase 300, into which second annular recess at least part of the fixing ring 120 is embedded when the first fixing seat 130 is mounted to the fixing ring 120. With this arrangement, the firmness and sealability of the installation between the first fixing base 130 and the fixing ring 120 can be ensured to prevent the leakage gas in the second isolation chamber 112 from entering the first isolation chamber 111.

The first fixing base 130 is provided with a first channel 131 so as to pass through the piston rod 500, and the first sealing assembly 210 is disposed on the first fixing base 130 and located between the first channel 131 and the piston rod 500 to achieve sealing between the first channel 131 and the piston rod 500. Meanwhile, the first fixing seat 130 plays a supporting role on the first sealing assembly 210, and the first sealing assembly 210 plays a supporting role on the middle part of the piston rod 500, so that the occurrence of the condition that the middle part of the piston rod 500 is bent can be effectively relieved.

In some embodiments, the middle body structure 100 may further include a second fixing base 140, wherein an end of the middle body 110 adjacent to the crankcase 300 may be provided with a second annular protrusion 114, the second fixing base 140 is connected to the second annular protrusion 114, and the second fixing base 140 is provided with a second channel 141.

As an example, an end of the middle body 110, which is adjacent to the crankcase 300 in the extending direction of the piston rod 500, may be provided with a circle of second annular protrusions 114, and an axis of the second annular protrusions 114 is parallel to the extending direction of the piston rod 500. The second annular protrusion 114 may be fixed to the inner wall of the middle body 110, for example, by welding, bonding, or the like, and of course, the second annular protrusion 114 may also be integrally formed with the middle body 110, for example, integrally cast, machined, or the like. Of course, the above-mentioned various ways can ensure the firmness between the second annular protrusion 114 and the middle body 110, so as to avoid the second annular protrusion 114 from separating from the middle body 110.

A plurality of fifth fixing holes may be formed in one turn of the second annular protrusion 114, and correspondingly, a plurality of sixth fixing holes may also be formed in one turn of the second fixing base 140, and when the second fixing base 140 is installed, the plurality of sixth fixing holes and the plurality of fifth fixing holes are respectively disposed opposite to each other, and then fastening bolts or fastening screws are respectively inserted into the plurality of fifth fixing holes, so as to firmly fix the second fixing base 140 on the second annular protrusion 114.

Optionally, a third annular recess is provided at an edge of the end face of the second fixing base 140 facing the crankcase 300, into which at least part of the second annular protrusion 114 is embedded when the second fixing base 140 is mounted to the second annular protrusion 114. With this arrangement, the mounting between the second fixing base 140 and the second annular projection 114 can be secured with tightness to prevent the leaking gas in the first isolation chamber 111 from entering the crankcase 300.

The second fixing seat 140 is provided with a second channel 141 so as to pass through the piston rod 500, and the second sealing assembly 220 is arranged on the second fixing seat 140 and positioned between the second channel 141 and the piston rod 500 to realize sealing between the second channel 141 and the piston rod 500. Meanwhile, the second fixing seat 140 plays a supporting role on the second sealing assembly 220, and the second sealing assembly 220 plays a supporting role on one end of the piston rod 500, so that the bending of the area, close to the end, of the piston rod 500 can be effectively relieved.

In some embodiments, the middle body structure 100 may further include a third fixing seat 150, wherein an end of the middle body 110 adjacent to the cylinder 400 may be provided with a third annular protrusion 115, the third fixing seat 150 is connected to the third annular protrusion 115, and the third fixing seat 150 is provided with a third channel 151.

As an example, an end of the middle body 110, which is adjacent to the cylinder 400 in the extension direction of the piston rod 500, may be provided with a circle of third annular protrusions 115, and the axes of the third annular protrusions 115 are parallel to the extension direction of the piston rod 500. The third annular protrusion 115 may be fixed to the inner wall of the middle body 110, for example, by welding, bonding, or the like, and of course, the third annular protrusion 115 may be integrally formed with the middle body 110, for example, integrally cast, machined, or the like. Of course, the above-mentioned various ways can ensure the firmness between the third annular protrusion 115 and the middle body 110, so as to avoid the third annular protrusion 115 from separating from the middle body 110.

A plurality of seventh fixing hole sites may be formed in one turn of the third annular protrusion 115, and correspondingly, a plurality of eighth fixing hole sites may be formed in one turn of the third fixing base 150, and when the third fixing base 150 is installed, the plurality of eighth fixing hole sites and the plurality of seventh fixing hole sites are respectively and oppositely disposed, and then fastening bolts or fastening screws are respectively inserted into the plurality of seventh fixing hole sites, so as to firmly fix the third fixing base 150 on the third annular protrusion 115.

Optionally, a fourth annular recess is provided at an edge of the end surface of the third fixing base 150 facing the cylinder 400, into which at least part of the third annular protrusion 115 is embedded when the third fixing base 150 is mounted to the third annular protrusion 115. With this arrangement, the firmness and sealability of the installation between the third fixing base 150 and the third annular protrusion 115 can be ensured to prevent the leakage gas in the cylinder 400 from entering the second isolation chamber 112.

To achieve sealing, to prevent gas in the cylinder 400 from leaking into the second isolation chamber 112, in this embodiment of the present application, the middle body 110 may be provided with a gas inlet 116 and a gas outlet 117; accordingly, the middle body structure 100 may further include a first connection pipe 160 and a second connection pipe 170, wherein the first connection pipe 160 is connected between the air inlet 116 and the third sealing assembly 230, the second connection pipe 170 is connected between the third sealing assembly 230 and the air outlet 117, and the air outlet 117 is used to connect with the separation device 600.

By the above arrangement, the sealed pressure gas can be sequentially delivered to the third sealing assembly 230 through the gas inlet 116 and the first connection pipe 160 and sequentially discharged into the separation device 600 through the second connection pipe 170 and the gas outlet 117, so that a pressure gas barrier can be formed at the third sealing assembly 230 by the pressure gas, thereby sealing can be achieved to prevent the gas in the cylinder 400 from entering the second isolation chamber 112.

Further, the third seal assembly 230 may include a packing seal set having a gas passage 231, the gas passage 231 communicating with the first connection pipe 160 and the second connection pipe 170. The gas channel 231 is communicated with the gap between the packing set and the piston rod 500, so that the gas in the cylinder 400 leaks into the gap between the packing set and the piston rod 500 and is blocked by the gas barrier formed by the pressure gas in the gas channel 231, thereby effectively preventing the leaked gas from continuously entering the second isolation chamber 112 through the gap.

In other embodiments, the gas inlet 116 may be used to purge the leakage gas at the third seal assembly 230, in which case, other pipelines may be used to introduce pressure gas into the gas channel 231 of the third seal assembly 230, and the pressure gas is finally delivered to the gas outlet 117 by the second connection pipeline 170 and finally discharged from the gas outlet 117.

In some embodiments, the middle body structure 100 may further include a load cell 180, where the load cell 180 is disposed at the exhaust port 117 to facilitate detection of the pressure of the exhaust gas, thereby ensuring that the seal is used for the pressure gas to have sufficient pressure to block the gas in the cylinder 400 from leaking into the second isolation chamber 112 by the pressure gas. Illustratively, the load cell 180 may employ a pressure sensor or the like to ensure the pressure measurement accuracy.

Of course, the middle body structure 100 may further include a temperature measuring element 190, where the temperature measuring element 190 is disposed at the exhaust port 117 to facilitate detection of the temperature of the exhaust gas. Illustratively, the temperature measuring element 190 may employ a temperature sensor or the like to ensure temperature measurement accuracy.

It is contemplated that the piston rod 500 may be filled with lubrication oil between the first and second seal assemblies 210 and 220 to provide lubrication, however, as the piston rod 500 moves back and forth, lubrication oil may be caused to enter the first and second isolation chambers 111 and 112 and accumulate. Based on this, the bottoms of the first and second isolation chambers 111 and 112 are respectively provided with drain outlets 118 communicating with the respective inner cavities, the drain outlets 118 being for connection with the separation device 600. By providing the drain port 118, the lubrication oil in the first and second isolation chambers 111 and 112 can be discharged to prevent the lubrication oil from accumulating in the first and second isolation chambers 111 and 112, and of course, the gas leaked from the cylinder 400 into the first and second isolation chambers 111 and 112 can be discharged through the drain port 118 as well. The lubricating oil and the leaked gas are both introduced into the separation device 600 for separation treatment, so as to avoid pollution caused by direct discharge. Illustratively, the separation device 600 may be an oil separation tank or the like.

In some embodiments, the reciprocating compressor may further include a sump 700 and a vacuum pump 800, wherein the sump 700 has an inlet connected to the separation device 600 and an outlet connected to the vacuum pump 800. It should be noted that, the vacuum pumping system is configured at the downstream of the sewage drain, so that the vacuum pump 800 can be used with a large-volume sewage collection tank, and the sewage collection tank can provide enough effective operation space for the vacuum pump 800, and form micro negative pressure in the sewage collection tank, so that gas can enter the sewage collection tank.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (10)

1. A midbody structure for a reciprocating compressor comprising a crankcase (300), a cylinder (400) and a piston rod (500), characterized in that the midbody structure (100) comprises: a middle body (110), a first seal assembly (210), a second seal assembly (220), and a third seal assembly (230);

the middle body (110) comprises a first isolation chamber (111) and a second isolation chamber (112), the first isolation chamber (111) is communicated with the second isolation chamber (112) through a first channel (131), a second channel (141) is arranged on one side, away from the second isolation chamber (112), of the first isolation chamber (111), the second channel (141) is used for being communicated with the first isolation chamber (111) and the crank case (300), a third channel (151) is arranged on one side, away from the first isolation chamber (111), of the second isolation chamber (112), the third channel (151) is used for being communicated with the second isolation chamber (112) and the cylinder (400), and the second channel (141), the first channel (131) and the third channel (151) are respectively used for penetrating through the piston rod (500);

the first sealing component (210) is connected between the first channel (131) and the piston rod (500) in a sealing mode, the second sealing component (220) is connected between the second channel (141) and the piston rod (500) in a sealing mode, and the third sealing component (230) is connected between the third channel (151) and the piston rod (500) in a sealing mode.

2. The mid-body structure according to claim 1, wherein the mid-body structure (100) further comprises a securing ring (120) and a first fixing seat (130);

the inner wall of the middle body (110) is provided with a first annular bulge (113), the fixed ring (120) is connected to the first annular bulge (113), the first fixing seat (130) is connected to the fixed ring (120), and the first fixing seat (130) is provided with a first channel (131).

3. The mid-body structure according to claim 1, wherein the mid-body structure (100) further comprises a second fixing seat (140);

one end of the middle body (110) adjacent to the crank case (300) is provided with a second annular protrusion (114), the second fixing seat (140) is connected to the second annular protrusion (114), and the second fixing seat (140) is provided with the second channel (141).

4. The intermediate structure according to claim 1, characterized in that the intermediate structure (100) further comprises a third fixing seat (150);

one end of the middle body (110) adjacent to the air cylinder (400) is provided with a third annular bulge (115), the third fixing seat (150) is connected to the third annular bulge (115), and the third fixing seat (150) is provided with a third channel (151).

5. The midbody structure according to claim 1, characterized in that the midbody body (110) is provided with an air inlet (116) and an air outlet (117);

the middle body structure (100) further comprises a first connecting pipeline (160) and a second connecting pipeline (170), wherein the first connecting pipeline (160) is connected between the air inlet (116) and the third sealing assembly (230), the second connecting pipeline (170) is connected between the third sealing assembly (230) and the air outlet (117), and the air outlet (117) is used for being connected with a separation device (600).

6. The mid-body structure according to claim 5, wherein the third seal assembly (230) comprises a packing seal set having a gas channel (231);

the gas passage (231) communicates the first connection line (160) and the second connection line (170).

7. The mesobody structure according to claim 5 or 6, wherein said mesobody structure (100) further comprises a load cell (180), said load cell (180) being arranged at said exhaust port (117);

and/or, the middle body structure (100) further comprises a temperature measuring element (190), and the temperature measuring element (190) is arranged at the exhaust port (117).

8. The intermediate structure according to claim 1, characterized in that the bottoms of the first and second isolation chambers (111, 112) are provided with respective drain openings (118) communicating with the respective inner cavities, the drain openings (118) being adapted to be connected with a separation device (600).

9. The intermediate structure according to claim 5 or 8, wherein the reciprocating compressor further comprises a dirt collecting device (700) and a vacuum pump (800);

the dirt collecting device (700) has an inlet connected to the separating device (600) and an outlet connected to the vacuum pump (800).

10. A reciprocating compressor, characterized by comprising a mesostructure (100) according to any one of claims 1 to 9.

Images