Fixing device for compressor air valve and compressor

Abstract

The utility model provides a fixing device used for a compressor air valve and a compressor, the fixing device comprises a gland, the gland is provided with a threaded hole, the gland is used for being fixedly connected with a compressor body, and the gland is provided with an inner side and an outer side which are oppositely arranged; the jackscrew is arranged in the threaded hole in a penetrating mode, one end of the jackscrew is located on the outer side of the gland, the other end of the jackscrew is used for being fixedly connected with the air valve in an abutting mode, and the jackscrew is in threaded connection with the threaded hole; the sealing part is arranged on the jackscrew in a penetrating mode, located on the inner side of the gland and used for sealing the threaded hole. By the adoption of the scheme, the problems that in the prior art, fastening measures are not reliable, and an air valve device is prone to leakage in the long-term operation process can be solved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a fixing device for a compressor valve and a compressor. Background Technology

[0002] The valve set screw is a critical component of the valve assembly, used to secure the valve plate. During compressor operation, if the valve set screw becomes loose, relative movement occurs between the valve and the cylinder body, between the valve and the valve cover, and between the valve cover and the valve cap. This can cause air leakage between the valve and the cylinder body, affecting efficiency. In severe cases, it can even seize the piston, leading to compressor overcurrent tripping. Shutting down the compressor for repairs would disrupt the process and impact economic efficiency. However, if the set screw nut is removed and tightened online, it could cause leakage of the compressor's process medium, which is extremely dangerous. Utility Model Content

[0003] This invention provides a fixing device for a compressor valve and a compressor, to solve the problem of leakage that easily occurs during the disassembly of the set screw in the prior art.

[0004] According to one aspect of the present invention, a fixing device for a compressor valve is provided. The fixing device includes: a pressure cap having a threaded hole, the pressure cap being fixedly connected to the compressor body, the pressure cap having an inner side and an outer side opposite to each other; a set screw passing through the threaded hole, one end of the set screw being located on the outer side of the pressure cap, the other end of the set screw being used to abut and fix the valve, the set screw being threadedly connected to the threaded hole; and a sealing part passing through the set screw and located on the inner side of the pressure cap, the sealing part being used to seal the threaded hole.

[0005] Furthermore, the sealing part includes: a sealing nut, which is threadedly connected to the set screw, the sealing nut being located inside the gland, and an anti-rotation structure between the sealing nut and the gland, the anti-rotation structure being used to limit the synchronous rotation of the sealing nut and the set screw; and a first sealing element, which is sleeved on the set screw, the first sealing element being located between the sealing nut and the gland, and the first sealing element being used to seal the threaded hole.

[0006] Furthermore, the outer periphery of the sealing nut has a polygonal structure, and a first mounting groove is provided at one end of the threaded hole located on the inner side of the gland. The sealing nut is located in the first mounting groove, and the side wall of the first mounting groove is adapted to the outer side wall of the sealing nut to restrict the rotation of the sealing nut.

[0007] Furthermore, the set screw includes a nut and a screw rod. The nut is fixed to one end of the screw rod located outside the pressure plate. The fixing device also includes a lock nut, which is threadedly connected to the screw rod. The lock nut is located between the nut and the pressure plate and is used to fix the position of the set screw on the pressure plate.

[0008] Furthermore, the set screw includes a screw rod and a connecting nut, the connecting nut being threaded to one end of the screw rod located on the outside of the gland.

[0009] Furthermore, the fixing device also includes a second seal, which is sleeved on the screw and located between the connecting nut and the gland. The second seal is used to seal the end of the threaded hole located on the outside of the gland.

[0010] Furthermore, a second mounting groove is provided at the end of the threaded hole located on the outside of the gland, and the second seal is located in the second mounting groove.

[0011] Furthermore, the fixing device also includes a sealing sleeve, which is fitted onto the end of the set screw located outside the pressure cap, and the sealing sleeve is sealed to the pressure cap.

[0012] Furthermore, a connecting groove is provided on the outer side of the gland, the connecting groove is located on the outer periphery of the threaded hole, a third sealing element is provided in the connecting groove, and the sealing sleeve is threadedly connected to the connecting groove.

[0013] According to another aspect of the present invention, a compressor is provided, the compressor including the above-described fixing device for the compressor valve.

[0014] The fixing device using the technical solution of this utility model includes a gland, a set screw, and a sealing part. The gland is used to fix the compressor body. The gland has a threaded hole, and the set screw passes through the threaded hole to restrict its rotation, achieving a more stable tightening effect. One end of the set screw extends outward from the outside of the gland for easy tightening by the operator, while the other end abuts against the valve cover of the air valve. In use, tightening the set screw presses the valve cover, thus fixing the air valve. A sealing part is provided on the set screw. Through contact with the inner side of the gland, the sealing part, due to the higher internal pressure of the compressor compared to the external pressure, tightly seals against the inner side of the gland under pressure, ensuring a tight seal. Even if the set screw loosens, the pressure difference between the inside and outside can still achieve a seal, reducing the possibility of leakage when the set screw loosens. This improves the fixation and sealing performance of the compressor air valve, ensuring the safe and stable operation of the compressor. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the fixing device provided in Embodiment 1 of this utility model is shown;

[0017] Figure 2 A schematic diagram of the fixing device provided in Embodiment 2 of this utility model is shown;

[0018] Figure 3 A schematic diagram of the fixing device provided in Embodiment 3 of this utility model is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Pressure cap; 11. Threaded hole;

[0021] 20. Set screw;

[0022] 201. Nut;

[0023] 202. Screw;

[0024] 203. Connecting nut;

[0025] 31. Sealing nut; 311. First mounting groove;

[0026] 33. First sealing element;

[0027] 34. Anti-loosening nuts;

[0028] 35. Second sealing element;

[0029] 351. Second mounting slot;

[0030] 36. Sealing sleeve;

[0031] 361. Connecting slot;

[0032] 37. Third sealing element;

[0033] 01. Valve cover; 02. Compressor body. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] like Figure 1As shown, according to one aspect of this utility model, a fixing device for a compressor valve is provided. The fixing device includes a pressure cap 10, a set screw 20, and a sealing part. The pressure cap 10 has a threaded hole 11 and is used for fixed connection with the compressor body 02. The pressure cap 10 has an inner side and an outer side opposite to each other. The set screw 20 passes through the threaded hole 11, with one end of the set screw 20 located on the outer side of the pressure cap 10 and the other end used to abut against and fix the valve. The set screw 20 is threadedly connected to the threaded hole 11. The sealing part passes through the set screw 20 and is located on the inner side of the pressure cap 10. The sealing part is used to seal the threaded hole 11. The set screw 20 can directly abut against the valve or abut against the valve through a valve cover 01. In this application, the set screw 20 abuts against the valve cover 01.

[0036] The fixing device, utilizing the technical solution of this utility model, includes a pressure cap 10, a set screw 20, and a sealing part. The pressure cap 10 is used to fix the compressor body 02. The pressure cap 10 has a threaded hole 11, through which the set screw 20 passes, restricting its rotation and achieving a more stable tightening effect. One end of the set screw 20 extends outward from the pressure cap 10 for easy tightening by the operator, while the other end abuts against the valve cover 01 of the air valve. In use, tightening the set screw 20 presses the valve cover 01, thereby fixing the air valve. A sealing part is provided on the set screw 20. Through contact with the inner side of the pressure cap 10, the internal pressure of the compressor is greater than the external pressure, allowing the sealing part to fit tightly against the inner side of the pressure cap 10 under pressure, ensuring a seal. Even if the set screw 20 loosens, the internal and external pressure difference can still achieve a seal, reducing the possibility of leakage when the set screw 20 loosens. The stability and sealing of the compressor valves have been improved, ensuring the safe and stable operation of the compressor.

[0037] like Figure 1 As shown, in this embodiment, the sealing part includes a sealing nut 31 and a first sealing member 33. The sealing nut 31 is threadedly connected to the set screw 20 and is located inside the pressure cap 10. An anti-rotation structure is provided between the sealing nut 31 and the pressure cap 10 to restrict the synchronous rotation of the sealing nut 31 and the set screw 20. The first sealing member 33 is sleeved on the set screw 20 and is located between the sealing nut 31 and the pressure cap 10. The first sealing member 33 is used to seal the threaded hole 11.

[0038] In this embodiment, the sealing part includes a sealing nut 31 and a first sealing element 33. The set screw 20 has a thread at one end near the pressure valve cover 01, which is threadedly connected to the sealing nut 31 located inside the pressure cover 10. An anti-rotation structure is provided between the sealing nut 31 and the pressure cover 10, which effectively restricts the rotation of the sealing nut 31, ensuring that when the set screw 20 is tightened, the sealing nut 31 can stably press the first sealing element 33 without rotating with the set screw 20. The first sealing element 33 is sleeved on the set screw 20 and located between the sealing nut 31 and the pressure cover 10. When the set screw 20 is tightened, the sealing nut 31 presses the first sealing element 33 against the inside of the pressure cover 10. The compression deformation of the first sealing element 33 achieves a seal on the threaded hole 11. Even under compressor vibration and changes in operating conditions, the high resilience of the first sealing element 33 can maintain continuous sealing pressure, preventing leakage and ensuring a tight seal under any operating condition.

[0039] Specifically, the outer shape of the sealing nut 31 should match the nut hole on the inner side of the gland 10. When the sealing nut 31 is connected to the set screw 20, it is restricted from rotating in the nut hole of the gland 10, thereby ensuring that the sealing nut 31 can remain relatively stationary when the set screw 20 is tightened, thus achieving a seal between the set screw 20 and the gland 10.

[0040] Specifically, the first seal 33 is made of a material with high resilience, such as a metal spiral wound gasket or a graphite-filled PTFE gasket, and the appropriate type is selected according to the operating conditions of the compressor.

[0041] Furthermore, the outer periphery of the sealing nut 31 is a polygonal structure, and a first mounting groove 311 is provided at one end of the threaded hole 11 located inside the pressure cap 10. The sealing nut 31 is located in the first mounting groove 311, and the side wall of the first mounting groove 311 is adapted to the outer side wall of the sealing nut 31 to restrict the rotation of the sealing nut 31.

[0042] In this embodiment, the outer periphery of the sealing nut 31 has a polygonal structure, such as a hexagon, to facilitate tightening with a wrench and prevent it from rotating due to vibration during compressor operation, thus maintaining the tightness of the air valve. A first mounting groove 311 is provided inside the gland 10, near the set screw 20. The shape of the first mounting groove 311 matches the polygonal structure of the outer periphery of the sealing nut 31. When the sealing nut 31 is placed in the first mounting groove 311, the sidewall of the first mounting groove 311 and the outer wall of the sealing nut 31 adapt to each other, forming an anti-rotation structure. This prevents the sealing nut 31 from rotating during the tightening or loosening of the set screw 20, ensuring that even during operation, the tightness of the set screw 20 is effectively maintained by the fixed position of the sealing nut 31, thereby preventing the air valve from loosening.

[0043] Furthermore, the set screw 20 includes a nut 201 and a screw 202. The nut 201 is fixed to one end of the screw 202 located outside the pressure cap 10. The fixing device also includes a lock nut 34, which is threadedly connected to the screw 202. The lock nut 34 is located between the nut 201 and the pressure cap 10 and is used to fix the position of the set screw 20 on the pressure cap 10.

[0044] In this embodiment, the set screw 20 includes a nut 201 and a screw 202. The nut 201 is fixed to the end of the screw 202 located outside the pressure cap 10. The nut 201 provides a flat surface for easy operation, facilitating rotation with tools. A locking nut 34 is provided between the nut 201 and the pressure cap 10. The locking nut 34 is threadedly connected to the screw 202. While the screw 202 presses against the valve cover 01, tightening the locking nut 34 locks the position of the set screw 20 on the pressure cap 10, preventing loosening of the set screw 20 due to vibration or other external forces during operation.

[0045] Specifically, when the set screw 20 needs to be tightened, the screw 202 is first pressed down by rotating the nut 201, thereby pressing the pressure valve cover 01 onto the air valve. After ensuring that the air valve is tightened in place, the operator continues to tighten the anti-loosening nut 34. Since the anti-loosening nut 34 is threadedly connected to the screw 202, this tightening method will limit the further rotation of the screw 202, thereby effectively preventing the set screw 20 from loosening due to vibration during operation.

[0046] like Figure 2 As shown, in Embodiment 2 of this application, the difference from the above embodiments is that the set screw 20 includes a screw 202 and a connecting nut 203, and the connecting nut 203 is threadedly connected to the end of the screw 202 located outside the pressure cover 10. In this embodiment, the set screw 20 includes a screw 202 and a connecting nut 203. One end of the screw 202 is flat-headed or ball-headed for contacting the pressure valve cover 01, and the other end is provided with external threads to be fixed with the connecting nut 203. The inner diameter and thread type of the connecting nut 203 match the external thread of the screw 202 to ensure that the two can be tightly connected. The connecting nut 203 is located outside the pressure cover 10. During installation, the screw 202 passes through the threaded hole 11 on the pressure cover 10 until one end contacts the pressure valve cover 01. At this time, the connecting nut 203 is tightened to the outer end of the screw 202 until it fits tightly against the outer surface of the pressure cover 10.

[0047] Furthermore, the fixing device also includes a second sealing element 35, which is sleeved on the screw 202 and located between the connecting nut 203 and the gland 10. The second sealing element 35 is used to seal the end of the threaded hole 11 located on the outside of the gland 10. In this embodiment, the second sealing element 35 is an annular sealing ring with an inner diameter slightly larger than the outer diameter of the set screw 20, while the outer diameter matches the outer dimension of the threaded hole 11 on the gland 10, to ensure that it can be tightly sleeved on the set screw 20 and form a sealing contact with the outside of the gland 10.

[0048] Before installation, the second seal 35 is fitted onto the set screw 20, positioning it between the connecting nut 203 and the outer side of the gland 10. Then, the set screw 20 is passed through the threaded hole 11 on the gland 10, and the connecting nut 203 is tightened, pressing against the hexagonal nut hole on the inner side of the gland 10. As the set screw 20 is further tightened to secure the valve cover 01, the connecting nut 203, through its engagement with the nut hole of the gland 10, restricts its own rotation. The tightening force of the set screw 20 is transmitted to the valve cover 01 through the first seal 33, while the second seal 35 is pressed between the connecting nut 203 and the outer side of the valve gland 10, forming a second seal to prevent leakage of the process medium from the outer threaded hole 11 of the gland 10.

[0049] Specifically, the material of the second seal 35 is also selected to have high resilience and chemical corrosion resistance, such as fluororubber, silicone rubber, metal O-rings, etc. The specific material needs to be determined according to the properties of the medium inside the compressor cylinder.

[0050] Specifically, even when the set screw 20 needs to be adjusted or tightened online, the presence of the second seal 35 ensures that disassembling or tightening the connecting nut 203 will not cause leakage of the process medium. Maintenance personnel can adjust the set screw 20 without shutting down the machine; simply rotating the set screw 20 will maintain the sealing of the connecting nut 203 and the second seal 35, ensuring safe operation.

[0051] Furthermore, a second mounting groove 351 is provided at the end of the threaded hole 11 located outside the gland 10, and the second seal 35 is located within the second mounting groove 351. In this embodiment, the second mounting groove 351 is located at the end of the threaded hole 11 located outside the gland 10. The shape and size of the second mounting groove 351 should match the second seal 35 to be installed to ensure that the second seal 35 can be stably installed therein. When the set screw 20 passes through the inside of the gland 10 and is tightened, the end of the connecting nut 203 will press tightly against the second seal 35, causing it to deform in the second mounting groove 351 and come into close contact with the outer end of the threaded hole 11, forming a second sealing barrier. At the same time, the depth and width of the second mounting groove 351 should be properly designed to prevent the second seal 35 from being squeezed out of the mounting groove after compression deformation, affecting the sealing effect.

[0052] like Figure 3 As shown in Embodiment 3 of this application, the difference from Embodiment 1 is that the fixing device further includes a sealing sleeve 36. The sealing sleeve 36 is sleeved on the end of the set screw 20 located outside the pressure cover 10, and the sealing sleeve 36 is sealed to the pressure cover 10. In this embodiment, the sealing sleeve 36 is sleeved on the end of the set screw 20 located outside the pressure cover 10 and is sealed to the pressure cover 10. Therefore, even if the set screw 20 becomes loose, the sealing sleeve 36 on the outside will always remain sealed, thereby extending the operation time and reducing the risk of leakage. In actual operation, the sealing sleeve 36 can help compensate for small displacements caused by thermal expansion and contraction, compressor vibration, etc., and maintain a long-term stable sealing effect. When replacing the sealing sleeve 36, it is not necessary to disassemble the entire valve fixing device; simply remove the old sealing sleeve 36 and install the new sealing sleeve 36.

[0053] Furthermore, a connecting groove 361 is provided on the outer side of the gland 10. The connecting groove 361 is located on the outer periphery of the threaded hole 11, and a third sealing element 37 is provided inside the connecting groove 361. The sealing sleeve 36 is threadedly connected to the connecting groove 361. In this embodiment, a connecting groove 361 is provided on the outer side of the gland 10. The shape and size of the connecting groove 361 must ensure that it can accommodate the sealing sleeve 36 and the third sealing element 37. At the same time, the inner wall of the connecting groove 361 is provided with threads that match the external threads of the sealing sleeve 36 to facilitate the connection and fastening of the two. The third sealing element 37 is placed at the bottom of the connecting groove 361. When the sealing sleeve 36 is screwed into the connecting groove 361, the third sealing element 37 is pressed between the side wall of the connecting groove 361 and the sealing sleeve 36, thereby achieving a seal between the sealing sleeve 36 and the gland 10. The use of the sealing sleeve 36 not only strengthens the seal between the set screw 20 and the gland 10, but also provides an extra layer of protection, preventing the directly exposed set screw 20 from being corroded by the external environment.

[0054] Specifically, the third seal 37 can be a sealing ring made of a material with high resilience and chemical corrosion resistance, such as an O-ring, V-ring, or rectangular gasket, and the appropriate seal type can be selected according to the compressor's operating conditions and media characteristics.

[0055] In another embodiment of this utility model, a compressor is provided, which includes the aforementioned fixing device for the compressor valve. In this embodiment, the gland 10 has a connection structure that matches the cylinder body, facilitating the installation and removal of the gland 10. When the valve becomes loose during compressor operation, the operator can directly tighten the set screw 20 online, preventing media leakage caused by disassembly. This not only ensures the continuous operation of the compressor but also reduces maintenance costs and time.

[0056] Specifically, it can be combined with an online monitoring system, such as a combustible and toxic gas monitoring device. Once a leak is detected at the top screw 20, measures should be taken immediately to tighten the top screw 20 to prevent the gas valve from being damaged due to long-term loosening and to ensure the stable operation of the compressor.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fixing device for a compressor valve, characterized in that, The fixing device includes: A pressure cap (10) is provided with a threaded hole (11). The pressure cap (10) is used to fix and connect with the compressor body (02). The pressure cap (10) has an inner side and an outer side that are arranged opposite to each other. A set screw (20) is inserted into the threaded hole (11). One end of the set screw (20) is located outside the pressure cap (10), and the other end of the set screw (20) is used to abut against the fixed air valve. The set screw (20) is threadedly connected to the threaded hole (11). A sealing part is provided on the set screw (20) and located inside the pressure cap (10). The sealing part is used to seal the threaded hole (11).

2. The fixing device according to claim 1, characterized in that, The sealing part includes: A sealing nut (31) is threadedly connected to the set screw (20). The sealing nut (31) is located inside the pressure cap (10). There is an anti-rotation structure between the sealing nut (31) and the pressure cap (10). The anti-rotation structure is used to restrict the sealing nut (31) and the set screw (20) from rotating synchronously. A first sealing element (33) is fitted onto the set screw (20). The first sealing element (33) is located between the sealing nut (31) and the gland (10). The first sealing element (33) is used to seal the threaded hole (11).

3. The fixing device according to claim 2, characterized in that, The outer periphery of the sealing nut (31) is a polygonal structure. The threaded hole (11) is provided with a first mounting groove (311) at one end located inside the pressure cap (10). The sealing nut (31) is located in the first mounting groove (311). The side wall of the first mounting groove (311) is adapted to the outer side wall of the sealing nut (31) to restrict the rotation of the sealing nut (31).

4. The fixing device according to claim 1, characterized in that, The set screw (20) includes a nut (201) and a screw (202). The nut (201) is fixed to one end of the screw (202) located outside the pressure cap (10). The fixing device also includes a lock nut (34). The lock nut (34) is threadedly connected to the screw (202). The lock nut (34) is located between the nut (201) and the pressure cap (10). The lock nut (34) is used to fix the position of the set screw (20) on the pressure cap (10).

5. The fixing device according to claim 1, characterized in that, The set screw (20) includes a screw (202) and a connecting nut (203), the connecting nut (203) being threaded to one end of the screw (202) located outside the pressure cap (10).

6. The fixing device according to claim 5, characterized in that, The fixing device further includes a second seal (35), which is sleeved on the screw (202) and located between the connecting nut (203) and the pressure cap (10). The second seal (35) is used to seal the end of the threaded hole (11) located outside the pressure cap (10).

7. The fixing device according to claim 6, characterized in that, The threaded hole (11) is provided with a second mounting groove (351) at one end located outside the pressure cap (10), and the second seal (35) is located in the second mounting groove (351).

8. The fixing device according to claim 1, characterized in that, The fixing device also includes a sealing sleeve (36), which is sleeved on the end of the top screw (20) located outside the pressure cap (10), and the sealing sleeve (36) is sealed to the pressure cap (10).

9. The fixing device according to claim 8, characterized in that, The outer side of the pressure cap (10) is provided with a connecting groove (361), the connecting groove (361) is located on the outer periphery of the threaded hole (11), a third sealing element (37) is provided in the connecting groove (361), and the sealing sleeve (36) is threadedly connected to the connecting groove (361).

10. A compressor, characterized in that, The compressor includes the stationary device as described in any one of claims 1 to 9.

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