WO2024001519A1

WO2024001519A1 - Integrated throttling and pressure-relief valve and compressor comprising same

Info

Publication number: WO2024001519A1
Application number: PCT/CN2023/092537
Authority: WO
Inventors: 黄志刚; 徐天赐; 牟英涛
Original assignee: 上海海立新能源技术有限公司
Priority date: 2022-06-27
Filing date: 2023-05-06
Publication date: 2024-01-04
Also published as: CN114992363A

Abstract

An integrated throttling and pressure-relief valve, which is configured to connect to a high-pressure airflow channel (91) of a high-pressure housing of a compressor. The integrated throttling and pressure-relief valve comprises: a throttling portion (1), a pressure-relief portion (2), a connector, and a first seal (4), which is used for sealing the throttling and pressure-relief valve and the high-pressure airflow channel, wherein the throttling portion (1), the pressure-relief portion (2), the connector and the first seal (4) are connected in sequence. The throttling portion (1) is provided with a first airflow channel (100). The pressure-relief portion (2) is provided with a hollow cavity (21), which accommodates a piston (200) and an extensible structure (300) for driving the piston to perform a reciprocating motion; and at least one second airflow channel (400), which communicates the hollow cavity with the external space of the throttling and pressure-relief valve. When the piston is in a first state, the first airflow channel is not in communication with the hollow cavity; and when the piston is in a second state, the first airflow channel, the hollow cavity and the second airflow channel are in communication. In the integrated throttling and pressure-relief valve, a pressure-relief function and a throttling function are integrated into one component, thereby being able to reduce parts, save on space and lower the manufacturing cost. Further disclosed is a compressor comprising the throttling and pressure-relief valve.

Description

Integrated throttle and pressure relief valve and compressor including the same

Technical field

The present invention relates to the field of compressors, and specifically to an integrated throttle and pressure relief valve and a compressor including the same.

Background technique

The compressor is the core component of the air conditioning system and the power source for the operation of the entire system. The compressor compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure gas. The high-temperature and high-pressure gas passes through the condenser, throttling device, evaporator, etc. and is converted back into low-temperature and low-pressure gas back to the compressor.

Discharge pressure is an important technical parameter that needs to be paid attention to in actual use of the compressor. Excessive exhaust pressure will reduce the safety and reliability of the compressor and reduce the service life of the compressor. Therefore, when the exhaust pressure is detected to be too high, it needs to be pressure relieved.

During the working process of the compressor, there is not only refrigerant but also lubricating oil in the cavity. When the lubricating oil enters the front chamber with the refrigerant and passes through the oil separation device, the refrigerant and lubricating oil will separate, and the refrigerant will enter Participating in circulation in the system, the lubricating oil will pass through the throttling and pressure-reducing device and return to the low-pressure chamber of the compressor.

In the existing technology, the two functional areas of the compressor, throttling and pressure relief, are designed independently. The current throttling and pressure reduction function is often achieved by drilling holes in the static scroll, housing and other components and installing oil return capillaries or throttling bolts. For example, the patent (CN111648962A) discloses a horizontal scroll compressor. The throttling device of the compressor is equipped with a filter assembly, a threaded column and a base. The spiral gap channel formed by the threaded column and the base is used to achieve Throttle. The throttling mechanism used in this patent is a threaded column. In order to install and fix this threaded column, it is necessary to add an installation structure on the partition separating the high and low pressure chambers to fix the base where the threaded column is located. The structure is complex, the installation is cumbersome, and additional components are added. costs and processing costs. That is, because the throttling effect is related to the area and length of the throttling channel, and is limited by the size and structure of the compressor, the throttling mechanism is often complex in form and difficult to process. At the same time, enough space is needed to arrange this type of throttling and pressure-reducing function, and the throttling mechanism needs to be fixed with a jack wire structure. This type of throttling and pressure-reducing function is accompanied by high manufacturing costs. Book.

It should be noted that the information disclosed in the above background section is only used to enhance understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art.

Contents of the invention

In view of the problems in the prior art, the purpose of the present invention is to provide an integrated throttle and pressure relief valve and a compressor including the same. The integrated throttle and pressure relief valve belt can not only complete the pressure relief function, but also complete the throttle function. The flow reduction function can achieve the effect of reducing parts, saving space and reducing manufacturing costs.

A first aspect of the present invention provides an integrated throttle and pressure relief valve for connecting with the high-pressure air flow channel of the high-pressure housing of the compressor, including a throttle part, a pressure relief part, and a throttle part connected in sequence. a connecting piece between the flow pressure relief valve and the high-pressure air flow channel and a first sealing member for sealing the throttle pressure relief valve and the high-pressure air flow channel;

The throttling part is provided with a first airflow channel;

The pressure relief part is provided with a hollow cavity that accommodates a piston and a telescopic structure that drives the piston to reciprocate, and at least one second airflow channel that connects the hollow cavity with the space outside the throttle and pressure relief valve;

When the piston is in the first state, the first airflow channel is not connected to the hollow cavity;

When the piston is in the second state, the first airflow channel, the hollow cavity and the second airflow channel are connected.

According to the first aspect of the present invention, the throttling part and the pressure relief part are integrated.

According to the first aspect of the present invention, the throttling part and the pressure relief part are detachably connected.

According to a first aspect of the present invention, one end of the throttle part connected to the pressure relief part is provided with a guide rod, and one end of the pressure relief part connected to the throttle part is provided with a guide rod adapted to the guide rod. Equipped with a guide groove, the throttling part and the pressure relief part are connected through an interference fit between the guide rod and the guide groove; or

One end of the pressure relief part connected to the throttle part is provided with a guide rod, and one end of the throttle part connected to the pressure relief part is provided with a guide groove adapted to the guide rod. Ryube and The pressure relief part is connected through an interference fit between the guide rod and the guide groove.

According to the first aspect of the present invention, the connecting member is a first thread, and the first thread is provided on the outer peripheral surface of the throttling part; and/or

The connecting member is a second thread, and the second thread is provided on the outer peripheral surface of the pressure relief part.

According to a first aspect of the present invention, the integrated throttle and pressure relief valve further includes a head portion connected to an end of the pressure relief portion facing away from the throttle portion.

According to a first aspect of the present invention, the first sealing member is an annular elastic member.

According to the first aspect of the present invention, the first sealing member is sleeved on the pressure relief portion; or

The first sealing member is sleeved between the pressure relief part and the head.

According to the first aspect of the present invention, the throttling part is made of resin material or metal material.

According to the first aspect of the present invention, the integrated throttle and pressure relief valve further includes a second seal;

The second sealing member is a first annular protruding structure provided in the hollow cavity. When the piston is in the first state, the first annular protruding structure and the piston face the first One end of the airflow passage is in conflict; or

The second sealing member is a second annular protruding structure disposed on one end of the piston facing the first air flow channel. When the piston is in the first state, the second annular protruding structure is close to The inner walls of the hollow cavity of the first airflow channel conflict with each other.

A second aspect of the present invention provides a compressor, including the integrated throttle and pressure relief valve;

The high-pressure housing of the compressor is provided with a high-pressure airflow channel and a low-pressure airflow channel;

The throttling part is gap-connected with the high-pressure air flow channel, and the low-pressure air flow channel is connected with the gap between the throttling part and the high-pressure air flow channel.

The integrated throttling and pressure relief valve of the present invention integrates the pressure relief function and the throttling function into one component, making full use of the space occupied by the pressure relief valve arrangement. There is no need to arrange an additional throttling mechanism, which simplifies the manufacturing process. The whole machine is easy to install and can be used for automated production, greatly reducing manufacturing costs.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application, and are read by reference. Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments in the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.

Figure 1 is a cross-sectional view of a pressure relief valve according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a pressure relief valve according to an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a throttling part according to an embodiment of the present invention;

Figure 4 is a partial structural schematic diagram of a compressor according to an embodiment of the present invention;

Figure 5 is a working state diagram of the pressure relief valve during pressure relief according to an embodiment of the present invention;

FIG. 6 is a working state diagram of the throttling part according to an embodiment of the present invention.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of the example embodiments. To those skilled in the art. The described features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

In this specification, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like is intended to be in conjunction with the specific features of the embodiment or example represented. , structures, materials or features are included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics shown may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples represented in this specification and the features of the different embodiments or examples unless they are inconsistent with each other.

Throughout this specification, when one device is said to be "connected" to another device, this includes not only the situation of "direct connection", but also the situation of "indirect connection" by placing other components in between. shape. Relative spatial terms such as "lower" and "upper" may be used to more easily explain the relationship of one device to another device illustrated in the drawings. Such terms are meant not only in the sense indicated in the drawings but also in other senses or operations of the device in use. For example, if the device in the figures is turned over, one element described as "below" another element would then be oriented "above" the other element. Therefore, the exemplary term "lower" is intended to include both upper and lower. The device can be rotated 90° or other angles, and terms referring to relative spaces are interpreted accordingly.

Although in some instances the terms first, second, etc. are used herein to refer to various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface are represented. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprising" and "including" indicate the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not exclude one or more other features, steps, operations, The presence, occurrence, or addition of elements, components, items, categories, and/or groups. The terms "or" and "and/or" as used herein are to be construed as inclusive or to mean any one or any combination. Therefore, "A, B or C" or "A, B and/or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C" . Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

Although not differently defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. Terms defined in commonly used dictionaries are additionally interpreted to have meanings that are consistent with the content of relevant technical documents and current prompts. As long as they are not defined, they shall not be overly interpreted to have ideal or very formulaic meanings.

In order to solve the problems in the prior art, the present invention provides an integrated throttling and pressure relief valve for connecting with the high-pressure air flow channel of the high-pressure housing of the compressor, including a throttling part and a pressure relief part connected in sequence. , a connector for connecting the throttle pressure relief valve and the high-pressure air flow channel, and a first seal for sealing the throttle pressure relief valve and the high-pressure air flow channel; the throttle part is provided with a first air flow channel; The pressure part is provided with a hollow cavity that accommodates the piston and a telescopic structure that drives the piston to reciprocate, and at least one second airflow channel that connects the hollow cavity with the space outside the throttle and pressure relief valve; when the When the piston is in the first state, the first airflow channel and the hollow cavity The bodies are not connected; when the piston is in the second state, the first air flow channel, the hollow cavity and the second air flow channel are connected. The integrated throttling and pressure relief valve of the present invention can perform both the pressure relief function and the throttling and pressure reducing function, thereby achieving the effects of reducing parts, saving space, and reducing manufacturing costs. In the present invention, "integrated" means that the valve component of the throttling and pressure relief valve integrates the pressure relief function and the throttling and pressure reducing function into one body. Specifically, the throttle and pressure relief valve may be an integrally molded part or an assembly of multiple components.

The structure and working principle of the integrated throttle and pressure relief valve of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the scope of the present invention.

Figures 1 and 2 are respectively a cross-sectional view and a structural schematic diagram of a pressure relief valve according to an embodiment of the present invention. Specifically, the integrated throttle and pressure relief valve is used to connect with the high-pressure air flow channel of the high-pressure housing of the compressor. It includes a throttle part 1, a pressure relief part 2 connected in sequence, a connector for connecting the high-pressure air flow channel of the throttle and pressure relief valve and the high-pressure housing, and a high-pressure air flow channel for sealing the throttle and pressure relief valve and the high-pressure housing. The first seal 4.

The throttle part 1 is provided with a first airflow channel 100; the pressure relief part 2 is provided with a hollow cavity 21 that accommodates a piston 200 and a telescopic structure 300 that drives the piston to reciprocate, and communicates with the hollow cavity. 21 and at least one second airflow channel 400 in the space outside the throttle and pressure relief valve.

When the piston is in the first state, the first airflow channel 100 is not connected with the hollow cavity 21 . In the embodiment of FIG. 1 , the state of the piston 200 when it is at the upper end of the hollow cavity 21 is the first state. At this time, the piston 200 faces one end of the throttle part 1 and the hollow cavity at the outlet of the first airflow channel 100 21 collides with each other, and the contact surface between the piston 200 and the hollow cavity 21 has a relatively high flatness. When the collision occurs, the communication channel between the first airflow channel 100 and the hollow cavity 21 is cut off.

In order to ensure that the channel between the first air flow channel 100 and the hollow cavity 21 is disconnected when the piston 200 collides with the end surface of the hollow cavity 21, the integrated throttle and pressure relief valve also includes a second seal. As shown in Figure 1, the second sealing member is a first annular protruding structure 500 provided in the hollow cavity. When the piston is in the first state, the first annular protruding structure 500 and The piston is in conflict with one end of the piston facing the first airflow channel; in other embodiments, the second sealing member may be a second sealing member disposed on one end of the piston facing the first airflow channel. Annular protrusion structure, when the piston is in the first state, the second annular protrusion structure conflicts with the inner wall of the hollow cavity close to the first air flow channel.

When the piston is in the second state, the first airflow channel 100 , the hollow cavity 21 and the second airflow channel 400 are connected. In the embodiment of FIG. 1 , when the end of the piston 200 facing the throttle part 1 does not conflict with the end surface of the hollow cavity 21 at the outlet of the first airflow channel 100 , both are in the second state of the piston. At this time, The first air flow channel 100 is connected to the upper space of the hollow cavity 21. At the same time, through the gap between the piston 200 and the hollow cavity 21, the lower space of the hollow cavity 21 is connected to the second air flow channel 400. It can be seen that out, the piston is in the second state, which is the pressure relief state.

The telescopic structure 300 of the present invention can be a spring, a rubber elastic material, a pipe telescopic device, etc. Any telescopic structure that can drive a piston to reciprocate in a hollow cavity can be used in the present invention. At the same time, when the pressure of the high-pressure airflow channel of the compressor is less than the critical pressure, the elastic force of the telescopic structure needs to be able to conflict with one end of the piston 100 and the end face of the hollow cavity 21; when the pressure of the high-pressure airflow channel of the high-pressure shell of the compressor When it is greater than the critical pressure, the pressure of the air flow channel needs to be able to overcome the elastic force of the telescopic structure so that one end of the piston does not conflict with the end surface of the hollow cavity 21 .

The pressure relief part and the throttling part of the integrated throttle and pressure relief valve may be integrally processed, that is, the throttling part and the pressure relief part are one piece, and the throttling part and the pressure relief part are fixedly connected. , the integrated throttle and pressure relief valve can be connected to the high-pressure air flow channel of the high-pressure shell of the compressor through a connecting piece. The connecting member may be a first thread 32 provided on the outer peripheral surface of the throttle part, and is adapted to the thread in the air flow passage of the high-pressure housing of the compressor. The connecting piece may also be a second thread 31 provided on the outer peripheral surface of the pressure relief part, and adapted to the thread in the air flow passage of the high-pressure housing of the compressor.

When both the throttle part 1 and the pressure relief part 2 are provided with threaded connectors, they are divided into two functional areas, the first thread 32 area of the throttle part and the second thread 31 area of the pressure relief part 2. When the compressor is normal During operation, since the throttling part and the high-pressure airflow channel have a clearance fit (discussed below), the high-pressure gas makes the throttling part tend to move toward the pressure relief part. Preferably, the second thread 31 area of the pressure relief part 2 serves as an integral part. The throttle and pressure relief valve is fixed in the area of the high-pressure airflow channel. At this time, the pressure relief part 2 plays a limiting role on the throttle part 1, which can ensure that the throttle part 1 remains relatively stationary when subjected to high exhaust pressure. Destroy the throttling structure. In order to better fix the throttle relief valve in the high-pressure air flow channel of the compressor, the diameter of the pressure relief part 2 can be designed to be greater than or equal to the diameter of the throttle part 1. At this time, the second screw The diameter of the thread 31 is greater than or equal to the diameter of the first thread 32 . In actual use, the length of the second thread 31 of the pressure relief valve can be appropriately increased so that the threaded area of the pressure relief portion can further play a role in fixedly connecting the high-pressure air flow channel.

The first sealing member 2 can be an annular elastic member, and the first sealing member 4 can be sleeved on the pressure relief portion 2 . The first seal 4 can be made of elastic rubber material, such as an O-ring or a sealing gasket. The high-pressure air flow channel sealing method of the throttle pressure relief valve and the high-pressure shell should be sealed in different ways according to the different working pressures of the compressor. When the exhaust pressure is low (such as R134a, R410A refrigerant compressors), O-ring seals can be used for sealing; when the exhaust pressure is high (such as _CO2 compressors), sealing gaskets can be used for sealing. The pressure relief part 2 may be provided with an annular groove for positioning an O-ring or a sealing gasket.

In some other embodiments, the throttling part 1 and the pressure relief part 2 may be separated, that is, they are detachably connected, and they are assembled into one piece during use. As shown in the embodiment of Figure 1, Figure 3 is a schematic structural diagram of the throttling part of this embodiment. One end of the throttling part 1 connected to the pressure relief part 2 is provided with a guide rod 12; the pressure relief part 2 is connected to the pressure relief part 2. One end connected to the throttling part 1 is provided with a guide groove that matches the guide rod 12; the throttling part 1 and the pressure relief part 2 pass through the guide rod 12 and the guide groove. Profit fit connection. It should be noted that a guide rod is provided at one end of the pressure relief part 2 connected to the throttle part 1, and an end connected to the throttle part 1 and the pressure relief part 2 is provided with the guide rod. 12 adapted guide grooves are also a feasible solution.

The throttling part 1 of the present invention may be made of resin material or metal material. The advantage of the detachable throttling part 1 and the pressure relief part 2 is that they can be prepared separately, which reduces the difficulty of preparing an integrated throttling and pressure relief valve, especially the pressure relief part provided with a hollow cavity. At the same time, the detachable throttling part 1 and the pressure relief part 2 facilitate the installation of the pressure relief valve in the high-pressure air flow channel of the high-pressure housing of the compressor.

In order to facilitate the threaded connection between the throttle and pressure relief valve and the high-pressure air flow channel of the compressor, the integrated throttle and pressure relief valve may also include a head 5 , and the head 5 and the pressure relief part 2 are away from the One end of the throttling part 1 is connected, and the cross section of the head 5 can be hexagonal to match existing wrenches and other tools. At this time, the first seal 4 can be sleeved on the pressure relief part 2 and the head 5, as shown in Figure 1.

The present invention also provides a compressor 9 including the above-mentioned integrated throttle and pressure relief valve. Figure 4 is A partial structural schematic diagram of a compressor according to an embodiment of the present invention; wherein, the high-pressure housing of the compressor is provided with a high-pressure airflow channel 91 and a low-pressure airflow channel 92; there is a gap between the throttle portion 1 and the high-pressure airflow channel 91 connected, and the low-pressure air flow channel 92 is connected with the gap between the throttle part and the high-pressure air flow channel 91 . The following is a further explanation of the structure and basic parameters of each component through the working principle of the integrated throttle and pressure relief valve.

The pressure of the high-pressure airflow channel is greater than the critical pressure, that is, when the exhaust pressure is higher than the rated pressure relief pressure of the pressure relief valve, the integrated throttle pressure relief valve starts to relieve pressure. Figure 5 shows the pressure relief valve relief valve according to one embodiment of the present invention. The working state diagram of the pressure relief valve, in which the solid arrow is the discharge channel of high-pressure gas when the throttle and pressure relief valve releases pressure, and the dotted arrow is the throttling and oil return channel of high-pressure lubricating oil. When the throttle and pressure relief valve begins to release pressure, the high-pressure gas pushes open the piston 200 in the hollow cavity 2 through the first air flow channel 100. The piston 200 is connected with the end surface of the hollow cavity 2 or with the first annular protruding structure 500. separation, the high-pressure gas enters the upper space of the hollow cavity 2. At the same time, the high-pressure gas of the hollow cavity 2 flows from both sides of the piston to the lower space of the hollow cavity 2 until the second air flow channel 400, which is connected to the atmosphere. , that is, the high-pressure gas is discharged from the compressor from the second air flow channel 400 . As the high-pressure gas is discharged, the pressure of the high-pressure air flow channel becomes smaller. When the exhaust pressure is slightly lower than the rated pressure relief pressure of the throttle and pressure relief valve, the telescopic structure re-presses the piston on the end face of the hollow cavity 2 or in contact with the first pressure relief valve. The annular convex structure cuts off the passage between the first air flow channel 10 and the hollow cavity 2 to block the pressure relief, and the pressure relief is completed.

During the entire operation of the compressor, the high-pressure lubricating oil passes through the throttling part of the throttle pressure relief valve. Figure 6 is a working state diagram of the throttling part according to an embodiment of the present invention. Specifically, according to fluid mechanics , the size of the throttling effect is related to the throttling area and throttling length. The smaller the throttling area, the longer the throttling length, and the better the throttling effect. When the first thread 32 is provided on the outer circumference of the throttle part 1, the first thread 32 can form a fine flow structure with the inner wall of the high-pressure airflow channel 91. Through the small and long channel here, this gap channel is connected with the high-pressure shell. The low-pressure fluid channel provided in the body is connected to realize the lubricating oil returning to the low-pressure chamber or medium-pressure chamber of the compressor to complete the throttling process. Of course, the gap connection between the throttle part 1 and the high-pressure airflow channel 91 is not limited to the threaded connection method mentioned above. In actual use, the gap between the throttle part 1 and the high-pressure airflow channel needs to be designed. Ensure that the difference between the actual flow area and the calculated flow area is as small as possible to ensure the required throttling effect.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It is understood that the specific implementation of the present invention is not limited to these descriptions. It is obvious to those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the application is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of the equivalent elements are included in this application. Any reference signs in the claims shall not be construed as limiting the claim in question.

Claims

An integrated throttle and pressure relief valve, characterized in that it is used to connect with the high-pressure air flow channel of the high-pressure shell of the compressor, and includes a throttle part and a pressure relief part connected in sequence, and is used to connect the throttle and pressure relief valve. The connection piece with the high-pressure air flow channel and the first sealing member for sealing the throttle and pressure relief valve with the high-pressure air flow channel;

The throttling part is provided with a first airflow channel;

The pressure relief part is provided with a hollow cavity that accommodates a piston and a telescopic structure that drives the piston to reciprocate, and at least one second airflow channel that connects the hollow cavity with the space outside the throttle and pressure relief valve;

When the piston is in the first state, the first airflow channel is not connected to the hollow cavity;

When the piston is in the second state, the first airflow channel, the hollow cavity and the second airflow channel are connected.
The integrated throttling and pressure relief valve according to claim 1, wherein the throttling part and the pressure relief part are one piece.
The integrated throttling and pressure relief valve according to claim 1, wherein the throttling part and the pressure relief part are detachably connected.
The integrated throttle and pressure relief valve according to claim 3, wherein a guide rod is provided at one end of the throttle part connected to the pressure relief part, and the pressure relief part is connected to the throttle part. One end is provided with a guide groove that matches the guide rod, and the throttling part and the pressure relief part are connected through an interference fit between the guide rod and the guide groove; or

One end of the pressure relief part connected to the throttle part is provided with a guide rod, and one end of the throttle part connected to the pressure relief part is provided with a guide groove adapted to the guide rod. The flow part and the pressure relief part are connected through an interference fit between the guide rod and the guide groove.
The integrated throttling and pressure relief valve according to claim 1, wherein the connecting member is a first thread, and the first thread is provided on the outer peripheral surface of the throttling part; and/or

The connecting member is a second thread, and the second thread is provided on the outer peripheral surface of the pressure relief part.
The integrated throttling and pressure relief valve according to claim 1, further comprising a head portion connected to an end of the pressure relief portion away from the throttling portion.
The integrated throttle and pressure relief valve according to claim 6, wherein the first sealing member is an annular elastic member.
The integrated throttle and pressure relief valve according to claim 7, wherein the first sealing member is sleeved on the pressure relief portion; or

The first sealing member is sleeved between the pressure relief part and the head.
The integrated throttling and pressure relief valve according to claim 1, wherein the throttling part is made of resin material or metal material.
The integrated throttle and pressure relief valve according to claim 1, further comprising a second seal;

The second sealing member is a first annular protruding structure provided in the hollow cavity. When the piston is in the first state, the first annular protruding structure and the piston face the first One end of the airflow passage is in conflict; or

The second sealing member is a second annular protruding structure disposed on one end of the piston facing the first air flow channel. When the piston is in the first state, the second annular protruding structure is close to The inner walls of the hollow cavity of the first airflow channel conflict with each other.
A compressor, characterized by comprising an integrated throttle and pressure relief valve as claimed in any one of claims 1 to 10;

The high-pressure housing of the compressor is provided with a high-pressure airflow channel and a low-pressure airflow channel;

The throttling part is gap-connected with the high-pressure air flow channel, and the low-pressure air flow channel is connected with the gap between the throttling part and the high-pressure air flow channel.