A sealing cover and a refrigerant pump

Abstract

This invention relates to a sealing cover and a refrigerant pump. The sealing cover includes a bowl-shaped body and a sealing connection portion disposed at the rim of the bowl-shaped body, and the sealing connection portion is provided with a sealing connection surface. The sealing cover also includes an elastic support portion disposed at the bottom of the bowl-shaped body. The elastic support portion includes, from the outside to the inside, a connection clearance portion, a sealing support foot, and an assembly through hole along the radial direction of the bowl-shaped body. The outer edge of the connection clearance portion is connected to the bowl-shaped body, and the connection clearance portion is provided with a clearance groove on the outer surface of the outer side of the bowl-shaped body. The sealing support foot is provided with a sealing support surface on the inner surface facing the inside of the bowl-shaped body. When the sealing cover is installed on a part, the sealing support surface of the sealing support foot is in close contact with the journal end face, and the sealing support foot deforms and displaces towards the outside of the bottom of the bowl-shaped body.

Description

Technical Field

[0001] This invention relates to the field of refrigerant pump technology, specifically to a sealing cover and a refrigerant pump. Background Technology

[0002] Rotary refrigerant pumps are used for pressurizing and pumping refrigerant, and are commonly used in refrigeration systems, heat pump systems, and air conditioning systems. See the attached diagram for the structure of a rotary refrigerant pump. Figure 6 and attached Figure 7 As shown, the main components include a housing assembly, a stator and rotor assembly, an upper cylinder, an upper cylinder head, a lower cylinder, a lower cylinder head, and a muffler. The muffler is a bowl-shaped structure installed and sealed on the lower end face of the lower cylinder head. The bottom of the bowl contacts the end face of the journal on the lower end face of the lower cylinder head to achieve a seal. At the same time, a through hole is provided at the bottom of the bowl for the short shaft of the journal to pass through. This forms a closed receiving space between the lower end face of the lower cylinder head, the circumferential surface of the journal, and the muffler. When the refrigerant liquid is discharged from the lower cylinder head, it will reach the muffler and enter the receiving space. Since the bottom of the muffler can fit against the end face of the journal of the lower cylinder head, it prevents the refrigerant liquid from leaking from the gap between the muffler and the end face of the journal to the through hole at the bottom of the bowl and flowing out. The muffler plays a role in sealing and noise reduction.

[0003] In existing products, the muffler's bowl edge is equipped with a sealing connection that is fixedly connected and fitted to the lower cylinder head. However, due to the quality of the mating surface between the lower muffler and the lower cylinder head, and the deformation of the muffler and the lower cylinder head during the process of locking the muffler and the lower cylinder head with bolts, the muffler and the lower cylinder head end face cannot fit well. In particular, there is a gap between the bottom of the muffler bowl and the end face of the journal, which allows refrigerant to enter the oil sump through the gap. The refrigerant carries the oil away from the refrigerant pump, ultimately causing the machine to operate with insufficient oil, affecting the reliability of the rotor refrigerant pump. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a sealing cover and a refrigerant pump, wherein the sealing cover can achieve a stable and reliable sealing effect with the lower cylinder head of the refrigerant pump, and avoid the influence of installation deformation on the seal.

[0005] To achieve the above object, the present invention provides a sealing cover for installation on a part with a journal for sealing. One end face of the part has a journal and a sealing working surface located around the bottom of the journal. The sealing cover includes a bowl-shaped main body and a sealing connection part provided at the bowl mouth of the bowl-shaped main body. The sealing connection part is used for fixedly connecting with the part, and a sealing connection surface for contacting the sealing working surface is provided on the sealing connection part. The sealing cover further includes an elastic support part provided at the bottom of the bowl-shaped main body. The elastic support part sequentially includes a connection avoidance part, a sealing support leg, and an assembly through-hole from the outside to the inside along the radial direction of the bowl-shaped main body. The outer edge of the connection avoidance part is connected to the bowl-shaped main body. An avoidance groove is provided on the outer side surface of the connection avoidance part located outside the bowl-shaped main body. A sealing support surface for abutting against the end face of the journal is provided on the inner side surface of the sealing support leg facing the inside of the bowl-shaped main body. When the sealing cover is installed on the part, the sealing support surface is in close contact with the end face of the journal, and the sealing support leg generates a deformation displacement towards the outside of the bottom of the bowl-shaped main body.

[0006] Further, when the elastic support part is in a natural state, the sealing support surface is inclined in the radial direction of the bowl-shaped main body, and the inner edge side of the sealing support surface is higher than the outer edge side.

[0007] Further, a sound-absorbing structure is provided inside the bowl-shaped main body.

[0008] Further, the sealing working surface is parallel to the end face of the journal, and the distance between the two is H1. The minimum distance between the sealing support surface and the sealing connection surface is H2, and H2 < H1.

[0009] Further, when the elastic support part is in a natural state, the sealing support surface is an inclined plane, and the inclination angle between the sealing support surface and the radial direction of the bowl-shaped main body is α. The width of the projection of the avoidance groove on the sealing support surface is B, and (H1 - H2) * sinα < B.

[0010] Further, the bottom surface of the avoidance groove is arc-shaped.

[0011] Further, the wall thickness at the connection between the bowl-shaped main body and the connection avoidance part is T, and B < T.

[0012] >Further, when the elastic support part is in a natural state, the diameter of the assembly through-hole is D1, the journal has a central shaft hole with an inner diameter of D2, and the outer diameter of the journal is D3. D2 + A < D1 < D3, where A ranges from 1.5 to 2.5 mm.

[0013] Furthermore, the sealing working surface and the journal are coaxially arranged, and the sealing connection surface, the connection clearance part, the sealing support foot and the clearance groove are all annular and coaxially arranged, and their central axis is collinear with the central axis of the bowl-shaped body.

[0014] The present invention also provides a refrigerant pump, including a lower cylinder head, wherein one end face of the lower cylinder head has a journal and a sealing working surface located at the bottom periphery of the journal, and further includes the aforementioned sealing cover, the sealing cover being installed on the lower cylinder head.

[0015] As described above, the sealing cover and refrigerant pump of the present invention have the following beneficial effects:

[0016] The sealing cover, through its elastic support at the bottom, utilizes the inclined sealing support surface of the sealing support feet and the connecting clearance part with clearance grooves. This allows the sealing support feet to deform and shift during installation. The elastic restoring force ensures tight contact between the sealing support surface and the journal end face of the lower cylinder head component. Furthermore, the clearance grooves provide space for radial displacement of the sealing support feet, reducing radial compression of the cup-shaped body and preventing damage to the sealing cover due to excessive radial compression deformation, thus affecting its sealing performance. Simultaneously, due to the flexibility of the elastic support, the contact position with the journal end face of the lower cylinder head can vary according to changes in component dimensions, providing excellent operational flexibility. When the sealing cover has a silencing structure inside the cup-shaped body, it can also function as a silencer. By installing the sealing cover on the lower cylinder head of the refrigerant pump, refrigerant leakage from the contact gap between the two is prevented, avoiding vibration of the sealing cover and improving the reliability of the refrigerant pump. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sealing cover in this invention.

[0018] Figure 2 This is a schematic diagram of the sealing cover in this invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the sealing cover in this invention.

[0020] Figure 4 This is a half-sectional view of the sealing cover in this invention.

[0021] Figure 5 for Figure 4 Enlarged view of circle A in the image.

[0022] Figure 6 This is a schematic diagram of the refrigerant pump in this invention.

[0023] Figure 7 This is a schematic diagram of the installation of the sealing cover on the lower cylinder head in this invention.

[0024] Explanation of icon numbers

[0025] 1. Sealing cover

[0026] 11. Bowl-shaped main body

[0027] 12 Sealing connection

[0028] 121 Sealing connection surface

[0029] 13. Elastic support section

[0030] 131 Connection and avoidance section

[0031] 132 Sealed support feet

[0032] 133 Assembly through hole

[0033] 134 Avoidance Groove

[0034] 135 Sealing support surface

[0035] 2. Lower cylinder head

[0036] 21 journals

[0037] 22 Sealing working surface

[0038] 3. Upper cylinder head

[0039] 4. Lower cylinder

[0040] 5. Upper cylinder

[0041] 6. Short axis

[0042] 7 Pistons

[0043] 8. Stator and rotor assembly

[0044] 9. Housing assembly Detailed Implementation

[0045] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0046] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0047] See Figures 1 to 7 This invention provides a sealing cover 1 for sealing a part with a journal 21. The part has a journal 21 on one end face and a sealing working surface 22 located on the outer periphery of the bottom of the journal 21. The sealing cover 1 includes a bowl-shaped body 11 and a sealing connection part 12 disposed at the rim of the bowl-shaped body 11. The sealing connection part 12 is used for fixed connection with the part, and the sealing connection part 12 is provided with a sealing connection surface 121 for contacting the sealing working surface 22. The sealing cover 1 also includes an elastic support part 13 disposed at the bottom of the bowl-shaped body 11. The elastic support part 13 includes, from the outside to the inside, a connection avoidance part 131 and a sealing support foot 132 along the radial direction of the bowl-shaped body 11. The assembly through hole 133 is connected to the outer edge of the connecting clearance part 131 and the bowl-shaped body 11. Correspondingly, the outer edge of the sealing support foot 132 is connected to the inner edge of the connecting clearance part 131, and the inner edge of the sealing support foot 132 is the assembly through hole 133. The connecting clearance part 131 has a clearance groove 134 on the outer surface of the bowl-shaped body 11. The sealing support foot 132 has a sealing support surface 135 on the inner surface facing the inside of the bowl-shaped body 11 for abutting against the end face of the journal 21. When the sealing cover 1 is installed on the part, the sealing support surface 135 of the sealing support foot 132 is in close contact with the end face of the journal 21, and the sealing support foot 132 deforms and displaces towards the bottom outside of the bowl-shaped body 11.

[0048] The sealing cover 1 of this invention forms a closed receiving space between the side of the part and the journal 21, preventing liquid medium from leaking out from the end face of the journal 21 after entering the sealing cover 1 from the part. The sealing cover 1 can be applied to the lower cylinder head 2 of a refrigerant pump, or to parts in other similar applications. See [reference needed]. Figure 6 and Figure 7Taking the operation of the sealing cover 1 on the lower cylinder head 2 of the refrigerant pump as an example, the lower cylinder head 2 of the refrigerant pump has a journal 21 on its lower end face, and a sealing working surface 22 located on the outer periphery of the bottom of the journal 21 (near the edge of the lower end face of the lower cylinder head 2). When the sealing cover 1 is installed, the sealing connection part 12 of the sealing cover 1 can be fixedly connected to the lower cylinder head 2 by bolts or other means, and the sealing connection surface 121 on the sealing connection part 12 is in close contact with the sealing working surface 22 on the lower end face of the lower cylinder head 2 to achieve sealing. The elastic support part 13 of the sealing cover 1 can undergo elastic deformation according to the lower cylinder head. The structural dimensions of section 2 are designed to ensure the distance between the sealing support surface 135 and the sealing connection surface 121. This allows the sealing support surface 135 on the sealing support foot 132 to be in close contact with the end face of the journal 21 after the sealing cover 1 is installed. Furthermore, the sealing support foot 132 deforms and displaces towards the bottom outer side of the bowl-shaped body 11 (i.e., downwards along the axial direction of the bowl-shaped body 11) through the connecting clearance part 131. The resulting restoring elasticity ensures a stable contact pressure between the sealing support surface 135 of the sealing support foot 132 and the end face of the journal 21, thus guaranteeing a stable sealing effect. The mounting through hole 133 is used for the short shaft 6 to pass through. When the sealing support foot 132 deforms and displaces axially in the bowl-shaped body 11, it also undergoes a small radial displacement. Because a clearance groove 134 is provided on the outer side of the connecting clearance part 131, the clearance groove 134 provides space for the radial displacement of the sealing support foot 132, reducing the radial compression of the bowl-shaped body 11 by the sealing support foot 132. This prevents damage to the sealing cover 1 caused by excessive radial compression deformation, which would affect the sealing performance. Meanwhile, due to the flexibility of the elastic support 13, the contact position with the end face of the journal 21 of the lower cylinder head 2 can vary depending on the size of the part, providing excellent flexibility in use. After the sealing cover 1 is installed, the space between the sealing cover 1, the journal 21, and the lower end face of the lower cylinder head 2 is sealed. When the refrigerant liquid is discharged from the lower cylinder head 2, it will reach the sealing cover 1. Since the elastic support 13 can fit against the end face of the journal 21 of the lower cylinder head 2, it prevents the refrigerant liquid from leaking from the gap between the sealing cover 1 and the end face of the journal 21 to the assembly through hole 133.

[0049] When the sealing cover 1 is installed at the lower cylinder head 2 of the refrigerant pump, a silencing structure is also provided inside the bowl-shaped body 11. The silencing structure can adopt an existing structure. In this case, the sealing cover 1 constitutes a silencer, achieving a silencing effect while performing a sealing function. In other applications where a silencing effect is not required, the sealing cover 1 may not need to be equipped with a silencing structure and only serves a sealing function.

[0050] See Figures 1 to 7 The present invention will be further described below with reference to a specific embodiment:

[0051] In this embodiment, see Figure 1 , Figure 2 and Figure 3 , as a preferred design, a suitable sound - absorbing structure is provided inside the bowl - shaped main body 11, so that the sealing cover 1 also functions as a silencer.

[0052] As a preferred design, in this embodiment, refer to Figure 5 and Figure 3 , when the elastic support portion 13 is in its natural state (that is, when not deformed by the extrusion of the journal 21), the sealing support surface 135 is inclined in the radial direction of the bowl - shaped main body 11. The inner edge side of the sealing support surface 135 can also be higher than the outer edge side. That is, when the sealing cover 1 has its bowl opening facing upward, the sealing support surface 135 is a convex shape with a higher middle and lower edges, preferably a conical surface. With such a design, after the sealing cover 1 is installed, the surface formed from the inner edge side to the outer edge side of the sealing support surface 135 can increase the contact area with the end face of the journal 21, so as to make the contact with the end face of the journal 21 closer.

[0053] In this embodiment, refer to Figure 4 and Figure 7 , the sealing working surface 22 of the lower cylinder head 2 is parallel to the end face of the journal 21, and the distance between them is H1. The sealing support surface 135 is located at the inner edge of the inner side surface of the sealing support foot 132, and the minimum distance between the sealing support surface 135 and the sealing connection surface 121 is H2, and H2 < H1, so as to ensure that the elastic support portion 13 will deform and displace and press tightly on the end face of the journal 21 after installation.

[0054] In this embodiment, refer to Figure 4 and Figure 5 , as a preferred design, the thickness of the sealing support foot 132 is preferably made uniform, that is, its inner and outer side surfaces are parallel. When the elastic support portion 13 is in its natural state (that is, when not deformed by the extrusion of the journal 21), the sealing support surface 135 is an inclined plane, and the inclination angle between the sealing support surface 135 and the radial direction of the bowl - shaped main body 11 is α (that is, the angle between the sealing support surface 135 and the cross - section perpendicular to the central axis of the bowl - shaped main body 11 is α). The bottom surface of the avoidance groove 134 is circular - arc - shaped in the width direction, its radius is R, and the width of the projection of the avoidance groove 134 on the sealing support surface 135 is B, satisfying (H1 - H2)*sinα < B, so as to make the avoidance groove 134 have a suitable width and ensure that the sealing support foot 132 will not directly squeeze the side wall of the bowl - shaped main body 11 during deformation displacement. Further, the wall thickness at the connection between the bowl - shaped main body 11 and the connection avoidance portion 131 is T, and it satisfies B < T, to avoid excessive bending stress of the elastic support portion 13 after being deformed by the extrusion of the journal 21 due to too large width B.

[0055] In this embodiment, refer to Figure 4 and Figure 7, as an optimal design, when the elastic support portion 13 is in a natural state, the diameter of the assembly through hole 133 is D1, the central shaft hole with an inner diameter of D2 is provided in the journal 21 of the lower cylinder head 2, and this central shaft hole is for the short shaft 6 to pass through, and the outer diameter of the journal 21 is D3, D2 + A < D1 < D3, where A ranges from 1.5 to 2.5 mm, so as to ensure that the elastic support portion 13 neither affects the assembly between the lower cylinder head 2 and the short shaft 6, nor has an appropriate contact area with the end face of the journal 21.

[0056] In this embodiment, referring to Figure 4 and Figure 7 , the sealing working surface 22 of the lower cylinder head 2 and the journal 21 are coaxially arranged. Correspondingly, the sealing connection surface 121, the connection avoidance portion 131, the sealing support feet 132 and the avoidance groove 134 in the sealing cover 1 are all circular rings and coaxially arranged, and the central axis is collinear with the central axis of the bowl-shaped main body 11. When the sealing cover 1 is installed on the lower cylinder head 2, the central axes of the two are coaxially arranged, which is more convenient for positioning and assembly. Of course, the shapes and central axes of the above-mentioned various parts can also have slight deviations as long as they do not affect the normal operation.

[0057] The present invention also provides a refrigerant pump, referring to Figure 6 and Figure 7 , which includes a lower cylinder head 2. One end face of the lower cylinder head 2 has a journal 21 and a sealing working surface 22 located on the outer periphery of the bottom of the journal 21. It also includes the above-mentioned sealing cover 1. The sealing cover 1 is installed on the lower cylinder head 2. The connecting bolts pass through the sealing connection portion 12 of the sealing cover 1 and are screwed and fixed with the lower cylinder head 2 to fixedly connect the sealing cover 1 to the lower side of the lower cylinder head 2. At the same time, it is ensured that the sealing connection surface 121 is in close contact with the sealing working surface 22 of the lower cylinder head 2 to achieve sealing, and the sealing support surface 135 on the sealing support feet 132 is in close contact with the end face of the journal 21 to achieve sealing. The sealing cover 1 also functions as a silencer through the sound-absorbing structure in the bowl-shaped main body 11. The refrigerant pump in this embodiment is a rotor refrigerant pump, and it also includes existing structures such as an upper cylinder head 3, a lower cylinder 4, an upper cylinder 5, a short shaft 6, a piston 7, a stator-rotor assembly 8, a housing assembly 9, etc. The specific structure, connection relationship and working principle of the refrigerant pump can all adopt the existing design and will not be elaborated here.

[0058] The sealing cover 1 and the refrigerant pump of the present invention have the following beneficial effects:

[0059] The sealing cover 1, through the elastic support part 13 at the bottom, utilizes the sealing support surface 135 of the inclined sealing support foot 132 and the connecting clearance part 131 with the clearance groove 134, so that the sealing support foot 132 can deform and displace during the installation of the sealing cover 1. The elastic restoring force ensures that the sealing support surface 135 is in close contact with the end face of the journal 21 of the lower cylinder head 2 part, and the clearance groove 134 provides space for the radial displacement of the sealing support foot 132, reducing the radial compression of the sealing support foot 132 on the bowl-shaped body 11, thereby avoiding damage to the sealing cover 1 due to excessive radial compression deformation and affecting the sealing performance. At the same time, since the elastic support part 13 has a certain degree of flexibility, the contact position with the end face of the journal 21 of the lower cylinder head 2 can be different according to the change of part size, which has good flexibility of use. When the sealing cover 1 has a sound-absorbing structure inside the bowl-shaped body 11, it can also act as a silencer. By installing the sealing cover 1, the lower cylinder cover 2 of the refrigerant pump prevents the refrigerant from leaking from the contact gap between the two, avoids vibration of the sealing cover 1, and improves the reliability of the refrigerant pump.

[0060] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A sealing cover for sealing a part with a journal (21), wherein the part has a journal (21) on one end face and a sealing working surface (22) located on the periphery of the bottom of the journal (21), the sealing cover (1) includes a bowl-shaped body (11) and a sealing connection part (12) disposed at the rim of the bowl-shaped body (11), the sealing connection part (12) is used for fixed connection with the part, and the sealing connection part (12) is provided with a sealing connection surface (121) for contacting the sealing working surface (22), characterized in that: The seal cover (1) further includes an elastic support portion (13) provided at the bottom of the bowl-shaped main body (11). The elastic support portion (13) sequentially includes a connection avoidance portion (131), a seal support leg (132), and an assembly through hole (133) from the outside to the inside along the radial direction of the bowl-shaped main body (11). The outer edge of the connection avoidance portion (131) is connected to the bowl-shaped main body (11). The connection avoidance portion (131) has an avoidance groove (134) provided on its outer surface located outside the bowl-shaped main body (11). The seal support leg (132) has a seal support surface (135) provided on its inner surface facing the inside of the bowl-shaped main body (11) for abutting against the end surface of the journal (21). When the elastic support portion (13) is in its natural state, the seal support surface (135) is inclined in the radial direction of the bowl-shaped main body (11), and the inner edge side of the seal support surface (135) is higher than the outer edge side. When the seal cover (1) is installed on the part, the seal support surface (135) is in close contact with the end surface of the journal (21), and the seal support leg (132) generates a deformation displacement toward the outside of the bottom of the bowl-shaped main body (11).

2. The sealing cover according to claim 1, characterized in that: A sound-absorbing structure is provided inside the bowl-shaped main body (11).

3. The sealing cover according to claim 1, characterized in that: The seal working surface (22) is parallel to the end surface of the journal (21), and the distance between them is H1. The minimum distance between the seal support surface (135) and the seal connection surface (121) is H2, and H2 < H1.

4. The sealing cover according to claim 3, characterized in that: When the elastic support portion (13) is in its natural state, the seal support surface (135) is an inclined plane, and the inclination angle between the seal support surface (135) and the radial direction of the bowl-shaped main body (11) is α. The width of the projection of the avoidance groove (134) on the seal support surface (135) is B, and (H1 - H2) * sinα < B.

5. The sealing cover according to claim 1 or 4, characterized in that: The bottom surface of the avoidance groove (134) is arc-shaped.

6. The sealing cover according to claim 4, characterized in that: The wall thickness at the connection between the bowl-shaped main body (11) and the connection avoidance portion (131) is T, and B < T.

7. The sealing cover according to claim 1, characterized in that: When the elastic support portion (13) is in its natural state, the diameter of the assembly through hole (133) is D1. The journal (21) has a central shaft hole with an inner diameter of D2, and the outer diameter of the journal (21) is D3. D2 + A < D1 < D3, where A ranges from 1.5 to 2.5 mm.

8. The sealing cover according to claim 1, characterized in that: The seal working surface (22) and the journal (21) are coaxially arranged. The seal connection surface (121), the connection avoidance portion (131), the seal support leg (132), and the avoidance groove (134) are all circular rings and are coaxially arranged, and their central axes are collinear with the central axis of the bowl-shaped main body (11).

9. A refrigerant pump, comprising a lower cylinder head (2), wherein one end face of the lower cylinder head (2) has a journal (21) and a sealing working surface (22) located on the periphery of the bottom of the journal (21), characterized in that: It further includes the seal cover (1) according to any one of claims 1 to 8, and the seal cover (1) is installed on the lower cylinder head (2).

Images