Sealing mechanism for evaporator of snow melting machine

Abstract

The utility model relates to the technical field of snow melting machines, and provides a snow melting machine evaporator sealing mechanism which comprises a fourth sealing piece arranged between one end of a stirring assembly and an evaporator, a connecting shaft is arranged on the evaporator, and the stirring assembly and the fourth sealing piece are detachably installed on the connecting shaft of the evaporator. The charging barrel assembly is designed to be detachably installed on the snow melting machine, the stirring assembly and the fourth sealing piece are detached from the connecting shaft penetrating through the evaporator, after the charging barrel assembly is detached from the snow melting machine, the evaporator of the snow melting machine is exposed, and the stirring assembly and the fourth sealing piece can be sequentially detached from the connecting shaft of the evaporator on the evaporator. And a user can conveniently clean and replace the fourth sealing element.

Description

TECHNICAL FIELD

[0001] The utility model relates to snow melting machine technical field, concretely relates to a snow melting machine evaporimeter sealing mechanism. BACKGROUND

[0002] The snow melting machine also called ice sand machine comprises a material cylinder assembly, an evaporimeter and a stirring assembly located in the material cylinder assembly, a driving box assembly is arranged on one side of the material cylinder assembly, a motor in the driving box assembly is in transmission connection with the stirring assembly through a connecting shaft, the connecting shaft passes through the evaporimeter and is connected with the stirring assembly, the stirring assembly is sleeved on the outside of the evaporimeter, and liquid in the material cylinder assembly is changed into ice after heat exchange between the evaporimeter and the material cylinder assembly. SUMMARY

[0003] The utility model provides a snow melting machine evaporimeter sealing mechanism, material cylinder assembly is designed to detachable installation on the snow melting machine, and the stirring assembly and the fourth sealing piece are detached on the connecting shaft penetrating the evaporimeter, after the material cylinder assembly is detached on the snow melting machine, the evaporimeter of the snow melting machine is exposed, the stirring assembly and the fourth sealing piece and the first sealing piece can be sequentially detached on the connecting shaft of the evaporimeter on the evaporimeter, so that the user can clean and replace the fourth sealing piece.

[0004] A snow melting machine evaporimeter sealing mechanism designed for the purpose comprises a first sealing piece between an evaporimeter and a rear shell assembly, one end of the evaporimeter is connected with the rear shell assembly, and the first sealing piece is detachably installed on the connecting part between the evaporimeter and the rear shell assembly to seal the installation gap between the evaporimeter and the rear shell assembly.

[0005] The rear shell assembly is provided with a mounting opening for cooperating with the evaporimeter, and the evaporimeter is limited in the mounting opening.

[0006] The rear shell assembly comprises a rear cover plate provided with a mounting opening, one end of the evaporimeter passes through the mounting opening and cooperates with the rear cover plate, the first sealing piece is sleeved on the outside of the evaporimeter, and the outside of the first sealing piece is limited in the mounting opening.

[0007] The rear housing assembly also includes a first bracket connected to the rear cover plate, a limiting protrusion protruding from the first bracket, and a second sealing element provided at the connection between the rear cover plate and the first bracket.

[0008] One end of the evaporator passes through the rear cover plate and abuts against the first bracket, and a third sealing element is provided between the first bracket and one end of the evaporator.

[0009] The first bracket is provided with a sealing groove for installing the second seal, and the rear cover plate is provided with an insertion protrusion corresponding to the sealing groove. The insertion protrusion is inserted into the sealing groove and abuts against the second seal.

[0010] The first bracket has a second bracket at its rear for mounting the driver assembly.

[0011] It also includes a fourth seal disposed between one end of the stirring assembly and the evaporator. The evaporator is provided with a connecting shaft, and the stirring assembly and the fourth seal are detachably mounted on the connecting shaft of the evaporator.

[0012] The evaporator is provided with a mounting cavity for assembling the connecting shaft. The mounting cavity passes through the evaporator. One end of the fourth seal abuts against the outer end face of the opening of the mounting cavity, so that the fourth seal seals the end opening of the mounting cavity of the evaporator, and the fourth seal is limited between the inner side of the stirring assembly and the outer end face of the opening of the mounting cavity.

[0013] The stirring assembly and evaporator are placed inside the material cylinder assembly of the snow melting machine, and the rear shell assembly is located at the rear end of the material cylinder assembly;

[0014] The stirring assembly and the first sealing element are respectively installed on the evaporator, and the first sealing element is limited between the stirring assembly and the rear shell assembly;

[0015] The stirring assembly is disassembled from the connecting shaft end of the evaporator, and the first seal is axially disengaged from the evaporator.

[0016] The material cylinder assembly is detachably installed on the snow melting machine. The material cylinder assembly is detached from the snow melting machine. The snow melting machine has an open part on the corresponding evaporator for detaching and assembling the stirring assembly, the fourth seal and the first seal.

[0017] The snow melting machine is equipped with a bracket for assembling the material cylinder assembly. A sliding connection component is provided between the material cylinder assembly and the bracket. The material cylinder assembly is detachably installed on the bracket through the sliding connection component.

[0018] The sliding connection assembly includes a slide groove on the bracket and a slider on the barrel assembly. The barrel assembly is mounted on the bracket and supported on the bracket. The slider slides into the slide groove. The barrel assembly is removed from the bracket and the slider slides out of the slide groove.

[0019] The barrel assembly is provided with a support block supported on a bracket;

[0020] The connecting shaft is provided with a pad that mates with the fourth seal. The fourth seal is provided with a limiting groove, and the pad is limited in the limiting groove. A fifth seal is provided at the mating point between the pad and the connecting shaft.

[0021] The beneficial technical effects of this utility model are as follows:

[0022] The cylinder assembly is designed to be detachably installed on the snow melting machine, and the stirring assembly and the fourth seal are detached from the connecting shaft that passes through the evaporator. After the cylinder assembly is detached from the snow melting machine, the evaporator of the snow melting machine is exposed. The stirring assembly, the fourth seal, and the first seal can be detached from the evaporator in sequence from the connecting shaft of the evaporator, which is convenient for users to clean and replace the fourth seal and the first seal. In addition, users can also clean the cylinder assembly and the stirring assembly.

[0023] The outer diameter of the connecting shaft is smaller than the inner diameter of the mounting cavity to prevent the evaporator from rotating when the connecting shaft rotates. The fourth seal abuts against the outer end face of the mounting cavity opening to prevent liquid from the barrel assembly from entering the mounting cavity. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a three-dimensional structural diagram of the material cylinder assembly disassembled onto the body of the snow melting machine according to an embodiment of the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of the stirring assembly, the fourth sealing element, and the first sealing element disassembled on a snow melting machine according to an embodiment of the present invention.

[0027] Figure 3 This is a three-dimensional cross-sectional structural diagram of a material cylinder assembly according to an embodiment of the present invention.

[0028] Figure 4 This is a three-dimensional structural diagram of a bracket according to an embodiment of the present invention.

[0029] Figure 5 This is a three-dimensional cross-sectional structural diagram of the assembly between the barrel assembly and the rear shell assembly according to an embodiment of the present invention. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] See Figures 1-5 A sealing mechanism for a snow melting machine evaporator includes a first sealing element 8 between an evaporator 2 and a rear shell assembly 21. One end of the evaporator 2 is connected to the rear shell assembly 21. The first sealing element 8 is detachably installed at the connection between the evaporator 2 and the rear shell assembly 21 to seal the installation gap between the evaporator 2 and the rear shell assembly 21.

[0032] The cylinder assembly 6 is designed to be detachably installed on the snow melting machine, and the stirring assembly 1 and the fourth seal 3 are detached from the connecting shaft that passes through the evaporator 2. After the cylinder assembly 6 is detached from the snow melting machine, the evaporator 2 of the snow melting machine is exposed. The stirring assembly 1, the fourth seal 3, and the first seal 8 can be detached from the evaporator 2 in sequence from the connecting shaft 4 of the evaporator 2, which is convenient for users to clean and replace the fourth seal 3 and the first seal 8. In addition, users can also clean the cylinder assembly 6 and the stirring assembly 1.

[0033] The stirring assembly 1 and the evaporator 2 are placed inside the material cylinder assembly 6 of the snow melting machine. One end of the material cylinder assembly 6 is provided with a rear cover plate 7, and one end of the evaporator 2 extends into the rear cover plate 7. A first sealing element 8 is provided between the evaporator 2 and the rear cover plate 7. The first sealing element 8 seals the installation gap between the evaporator 2 and the rear cover plate 7, and the first sealing element 8 is detachably installed between the evaporator 2 and the rear cover plate 7.

[0034] In this embodiment, the first sealing element 8 is also located inside the barrel assembly 6, and the rear cover plate 7 is provided at the rear end opening of the barrel assembly 6 to prevent the liquid in the barrel assembly 6 from leaking from the rear end opening of the barrel assembly 6. Therefore, the first sealing element 8 is provided between the rear cover plate 7 and the evaporator 2 to prevent the liquid in the barrel assembly 6 from leaking along the installation gap between the rear cover plate 7 and the evaporator 2.

[0035] The rear housing assembly 21 is provided with an installation opening 9 for cooperating with the evaporator 2, and the evaporator 2 is limited in the installation opening 9; the first sealing member 8 is sleeved on the evaporator 2, and the first sealing member 8 is located between the outer side of the evaporator 2 and the inner side of the installation opening 9.

[0036] The rear housing assembly 21 includes a rear cover plate 7 with an installation opening 9. One end of the evaporator 2 passes through the installation opening 9 and cooperates with the rear cover plate 7. The first sealing member 8 is sleeved on the outside of the evaporator 2, and the outer side of the first sealing member 8 is limited within the installation opening 9. The rear housing assembly 21 is provided with a limiting protrusion 23, which protrudes towards the rear of the first sealing member 8 and is provided on the rear housing assembly 21. The rear of the first sealing member 8 is limited by the limiting protrusion 23 to prevent the first sealing member 8 from detaching from the evaporator 2.

[0037] The rear housing assembly 21 also includes a first bracket 24 connected to the rear cover plate 7, a limiting protrusion 23 protruding from the first bracket 24, and a second sealing element 25 provided at the connection between the rear cover plate 7 and the first bracket 24.

[0038] One end of the evaporator 2 passes through the rear cover plate 7 and abuts against the first bracket 24. A third sealing element 26 is provided between the first bracket 24 and one end of the evaporator 2.

[0039] In this embodiment, the first bracket 24 is provided with an evaporator cover for sealing the rear opening of the evaporator 2. The evaporator cover abuts against the evaporator cover of the first bracket 24 and is fixed to the first bracket 24 by screws.

[0040] The third seal 26 forms a sealing structure between the evaporator 2 and the evaporator cover, preventing the refrigerant in the evaporator 2 from leaking out of the evaporator cover of the first bracket 24.

[0041] The first bracket 24 is provided with a sealing groove 27 for installing the second seal 25, and the rear cover plate 7 is provided with an insertion protrusion 28 corresponding to the sealing groove 27. The insertion protrusion 28 is inserted into the sealing groove 27 and abuts against the second seal 25.

[0042] The second seal 25 forms a second sealing structure between the first support 24 and the rear cover plate 7. When the first seal 8 fails, the liquid in the barrel assembly 6 enters between the first support 24 and the rear cover plate 7, and the second seal 25 can also prevent the liquid from leaking out.

[0043] The first bracket 24 has a second bracket 29 at its rear for mounting the driver assembly 30.

[0044] It also includes a fourth sealing element 3 disposed between one end of the stirring assembly 1 and the evaporator 2. The evaporator 2 is provided with a connecting shaft 4. The stirring assembly 1 and the fourth sealing element 3 are detachably installed on the connecting shaft 4 of the evaporator 2.

[0045] The evaporator 2 is provided with a mounting cavity 5 for assembling the connecting shaft 4. The mounting cavity 5 passes through the evaporator 2. One end of the fourth sealing member 3 abuts against the outer end face of the opening of the mounting cavity 5 so that the fourth sealing member 3 seals the end opening of the mounting cavity 5 of the evaporator 2, and the fourth sealing member 3 is limited between the inner side of the stirring assembly 1 and the outer end face of the opening of the mounting cavity 5.

[0046] In this embodiment, the connecting shaft 4 passes through the mounting cavity 5, inserts into the evaporator 2, and connects to the head of the stirring assembly 1. The outer diameter of the connecting shaft 4 is smaller than the inner diameter of the mounting cavity 5 to prevent the evaporator 2 from rotating when the connecting shaft 4 rotates. The fourth sealing member 3 abuts against the outer end face of the opening of the mounting cavity 5 to prevent liquid in the barrel assembly 6 from entering the mounting cavity 5.

[0047] The stirring assembly 1 and the evaporator 2 are placed inside the material cylinder assembly 6 of the snow melting machine, and the rear shell assembly 21 is located on the rear end of the material cylinder assembly 6.

[0048] The stirring assembly 1 and the first sealing element 8 are respectively installed on the evaporator 2, and the first sealing element 8 is limited between the stirring assembly 1 and the rear shell assembly 21.

[0049] The stirring assembly 1 is disassembled from the end of the connecting shaft 4 of the evaporator 2, and the first seal 8 is axially separated from the evaporator 2.

[0050] The material cylinder assembly 6 is detachably installed on the snow melting machine 10. The material cylinder assembly 6 is detached from the snow melting machine 10. The snow melting machine 10 forms a detachable opening 11 on the evaporator 2 for detaching and assembling the stirring assembly 1, the fourth seal 3 and the first seal 8.

[0051] The snow melting machine 10 is provided with a bracket 12 for assembling the material cylinder assembly 6. A sliding connection component is provided between the material cylinder assembly 6 and the bracket 12. The material cylinder assembly 6 is detachably installed on the bracket 12 through the sliding connection component.

[0052] The sliding connection assembly includes a slide groove 13 disposed on the bracket 12 and a slider 14 disposed on the barrel assembly 6. The barrel assembly 6 is mounted on the bracket 12 and supported on the bracket 12. The slider 14 slides into the slide groove 13. The barrel assembly 6 is disassembled from the bracket 12 and the slider 14 slides out of the slide groove 13.

[0053] The barrel assembly 6 is provided with a support block 15 supported on the bracket 12;

[0054] The connecting shaft 4 is provided with a pad 16 that cooperates with the fourth sealing element 3. The fourth sealing element 3 is provided with a limiting groove 18. The pad 16 is limited in the limiting groove 18. A fifth sealing element 17 is provided at the mating point between the pad 16 and the connecting shaft 4.

[0055] In this embodiment, one end of the evaporator 2 is inserted into the mounting opening 9 of the rear cover plate 7 so that one end of the evaporator 2 can be connected to a pipe.

[0056] When it is necessary to disassemble the fourth seal 3 and the first seal 8 on the snow melting machine 10, simply remove the cylinder assembly 6 from the snow melting machine 10. The evaporator 2 is exposed on the disassembly and assembly opening 11. First, disassemble the stirring assembly 1 onto the connecting shaft 4 of the evaporator 2. The connection between the connecting shaft 4 and the stirring assembly 1 is a square structure, and the shaft hole into which the stirring assembly 1 is inserted is a square hole. The connecting shaft 4 is provided with a flat shaft structure for inserting into the square hole. When the connecting shaft 4 rotates, it drives the stirring assembly 1 to rotate.

[0057] In this embodiment, the slide 13 includes a connected guide wide groove 19 and a limiting narrow groove 20. The width of the guide wide groove 19 on both the upper and lower sides is greater than the width of the limiting narrow groove 20 on both the upper and lower sides. When the barrel assembly 6 is installed, the slider 14 is aligned with the guide wide groove 19, and then the barrel assembly 6 is pushed, and the slider 14 enters the limiting narrow groove 20 along the guide wide groove 19. When the barrel assembly 6 is installed in place, the slider 14 of the barrel assembly 6 is vertically and vertically limited on the limiting narrow groove 20. The slide 13 is provided with a limiting block, and the limiting block and the inner side of the slide 13 form the limiting narrow groove 20.

[0058] In this embodiment, the fifth seal 17 has an assembly gap between the sealing gasket 16 and the connecting shaft 4. The gasket 16 is assembled with the fourth seal 3 to prevent the fifth seal 17 from arbitrarily axially disengaging from the connecting shaft 4.

[0059] In this embodiment, when the stirring assembly 1 is installed on the connecting shaft 4, the fourth seal 3 can be clamped between the stirring assembly 1 and the opening end face of the evaporator 2 mounting cavity 5, that is, the fourth seal 3 is axially limited between the stirring assembly 1 and the opening end face of the evaporator 2 mounting cavity 5.

[0060] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

[0061] In the above description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and is not intended to 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 of this application.

[0062] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections using screws, rivets, or welding; detachable connections; or connections formed by metal processing (die casting, deep drawing, lathe machining, etc.) or injection molding; they can also be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] In the above description of this application, unless otherwise expressly specified and limited, the use of terms such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A sealing mechanism for an evaporator of a snow melting machine, characterized in that: Includes a first seal (8) between the evaporator (2) and the rear shell assembly (21). One end of the evaporator (2) is connected to the rear shell assembly (21). The first seal (8) is detachably installed at the connection between the evaporator (2) and the rear shell assembly (21) to seal the installation gap between the evaporator (2) and the rear shell assembly (21).

2. The sealing mechanism for the evaporator of the snow melting machine according to claim 1, characterized in that: The rear housing assembly (21) is provided with an installation opening (9) for cooperating with the evaporator (2), and the evaporator (2) is limited in the installation opening (9); a first seal (8) is fitted on the evaporator (2), and the first seal (8) is located between the outside of the evaporator (2) and the inside of the installation opening (9).

3. The sealing mechanism for the evaporator of the snow melting machine according to claim 1, characterized in that: The rear housing assembly (21) includes a rear cover plate (7) with an installation opening (9). One end of the evaporator (2) passes through the installation opening (9) and cooperates with the rear cover plate (7). The first seal (8) is sleeved on the outside of the evaporator (2) and the outside of the first seal (8) is limited within the installation opening (9). The rear housing assembly (21) is provided with a limiting protrusion (23). The limiting protrusion (23) protrudes towards the rear of the first seal (8) and is provided on the rear housing assembly (21). The rear of the first seal (8) is limited on the limiting protrusion (23).

4. The sealing mechanism for the evaporator of the snow melting machine according to claim 3, characterized in that: The rear housing assembly (21) also includes a first bracket (24) connected to the rear cover plate (7), a limiting protrusion (23) protruding from the first bracket (24), and a second sealing element (25) provided at the connection between the rear cover plate (7) and the first bracket (24).

5. The evaporator sealing mechanism of the snow melting machine according to claim 4, characterized in that: One end of the evaporator (2) passes through the rear cover plate (7) and abuts against the first bracket (24). A third sealing element (26) is provided between the first bracket (24) and one end of the evaporator (2).

6. The evaporator sealing mechanism of the snow melting machine according to claim 4, characterized in that: The first bracket (24) is provided with a sealing groove (27) for installing the second seal (25), and the rear cover plate (7) is provided with a plug-in protrusion (28) corresponding to the sealing groove (27). The plug-in protrusion (28) is inserted into the sealing groove (27) and abuts against the second seal (25). The first bracket (24) has a second bracket (29) at its rear for mounting the driver assembly (30).

7. The sealing mechanism for the evaporator of the snow melting machine according to claim 1, characterized in that: It also includes a fourth seal (3) disposed between one end of the stirring assembly (1) and the evaporator (2), and a connecting shaft (4) is provided on the evaporator (2). The stirring assembly (1) and the fourth seal (3) are detachably installed on the connecting shaft (4) of the evaporator (2). The evaporator (2) is provided with an installation cavity (5) for assembling the connecting shaft (4). The installation cavity (5) passes through the evaporator (2). One end of the fourth seal (3) abuts against the outer end face of the opening of the installation cavity (5) so that the fourth seal (3) seals the end opening of the installation cavity (5) of the evaporator (2), and the fourth seal (3) is limited between the inner side of the stirring assembly (1) and the outer end face of the opening of the installation cavity (5).

8. The sealing mechanism for the evaporator of the snow melting machine according to claim 7, characterized in that: The stirring assembly (1) and the evaporator (2) are placed inside the cylinder assembly (6) of the snow melting machine, and the rear shell assembly (21) is located on the rear end of the cylinder assembly (6); The stirring assembly (1) and the first seal (8) are respectively installed on the evaporator (2), and the first seal (8) is limited between the stirring assembly (1) and the rear shell assembly (21); The stirring assembly (1) is disassembled from the end of the connecting shaft (4) of the evaporator (2), and the first seal (8) is axially disengaged from the evaporator (2).

9. The sealing mechanism for the evaporator of the snow melting machine according to claim 8, characterized in that: The cylinder assembly (6) is detachably installed on the snow melting machine (10). The cylinder assembly (6) is detached from the snow melting machine (10). The snow melting machine (10) forms a detachable opening (11) on the evaporator (2) for detaching and assembling the stirring assembly (1), the fourth seal (3) and the first seal (8). The snow melting machine (10) is provided with a bracket (12) for assembling the cylinder assembly (6). A sliding connection component is provided between the cylinder assembly (6) and the bracket (12). The cylinder assembly (6) is detachably installed on the bracket (12) through the sliding connection component.

10. The sealing mechanism for the evaporator of the snow melting machine according to claim 9, characterized in that: The sliding connection assembly includes a groove (13) on the bracket (12) and a slider (14) on the barrel assembly (6). The barrel assembly (6) is mounted on the bracket (12) and supported on the bracket (12). The slider (14) slides into the groove (13). When the barrel assembly (6) is removed from the bracket (12), the slider (14) slides out of the groove (13). The barrel assembly (6) is provided with a support block (15) supported on the bracket (12). The connecting shaft (4) is provided with a pad (16) that cooperates with the fourth seal (3). The fourth seal (3) is provided with a limiting groove (18). The pad (16) is limited in the limiting groove (18). A fifth seal (17) is provided at the mating point between the pad (16) and the connecting shaft (4).

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