Comb tooth sealing structure and compressor

Abstract

The utility model provides a comb tooth sealing structure and a compressor, the comb tooth sealing structure comprises sealing teeth, the sealing teeth are arranged on a base body, and the base body is the inner wall of a shaft hole or the outer wall of a rotating shaft; the comb tooth sealing structure is used for sealing a gap between the shaft hole and the outer wall of the rotating shaft in the shaft hole through the sealing teeth; the sealing teeth are triangular teeth; the sealing tooth is provided with a first surface and a second surface which are symmetrically arranged, one end of the first surface is connected with one end of the second surface, and the other end of the first surface and the other end of the second surface are oppositely opened and are connected with the base body; the included angle between the first surface and the second surface is k, and the distance between the other ends of the first surface and the second surface is w; wherein k is larger than or equal to 75 degrees and smaller than or equal to 85 degrees, and w is larger than or equal to 1 mm and smaller than or equal to 1.25 mm. According to the technical scheme, the pressure difference P between the two ends of the shaft hole can be large, and the sealing effect of the sealing teeth is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of labyrinth seals, and particularly relates to a labyrinth seal structure and a compressor. Background Art

[0002] An air circulator is a compressor used for compressing air for cyclic refrigeration. Due to its relatively high rotational speed, labyrinth seals are usually selected. The labyrinth form, the number of labyrinth teeth, and the seal length determine its sealing performance.

[0003] A related existing patent discloses a labyrinth structure using triangular sawteeth for sealing. Among them, the parameters of the triangular sawteeth have a significant impact on the sealing performance. The sealing performance of the triangular sawteeth in the prior art is insufficient and needs to be improved. Therefore, this problem needs to be solved. Summary of the Utility Model

[0004] Therefore, the utility model provides a labyrinth seal structure and a compressor, which can solve the technical problem of insufficient sealing performance of triangular sawteeth in the prior art.

[0005] To solve the above problems, the utility model provides a labyrinth seal structure, including sealing teeth. The sealing teeth are arranged on a base body, and the base body is the inner wall of a shaft hole or the outer wall of a rotating shaft. The labyrinth seal structure seals the gap between the shaft hole and the outer wall of the rotating shaft in the shaft hole through the sealing teeth; the sealing teeth are triangular teeth; the sealing teeth have a first surface and a second surface that are symmetrically arranged. One end of the first surface is connected to one end of the second surface, and the other end of the first surface and the other end of the second surface are relatively open and both are connected to the base body; when the base body is the inner wall of the shaft hole, the distance between the first surface and the first surface gradually decreases inward along the radial direction of the shaft hole; when the base body is the outer wall of the rotating shaft, the distance between the first surface and the second surface gradually decreases outward along the radial direction of the rotating shaft;

[0006] The included angle between the first surface and the second surface is k, and the distance between the other end of the first surface and the other end of the second surface is w; wherein, 75° ≤ k ≤ 85°, and 1 mm ≤ w ≤ 1.25 mm.

[0007] In some embodiments, k and w also satisfy the following formula:

[0008] P = -a + b*k + c*w - d*k 2 -e*w 2 -f*k*w

[0009] Wherein, P is the pressure difference between the two ends of the shaft hole, 2015.3 ≤ a ≤ 2016.3, 99.6 ≤ b ≤ 100.6, 5121.9 ≤ c ≤ 5122.9, 0.56 ≤ d ≤ 0.5, 249 ≤ e ≤ 252, 10.5 ≤ f ≤ 11.5, the unit of P is Pascal, the unit of k is degree, and the unit of w is millimeter.

[0010] In some embodiments, the number of the sealing teeth is more than two; wherein, when the base body is the inner wall of the shaft hole, the sealing teeth are arranged at intervals in sequence along the axis direction of the shaft hole; when the base body is the outer wall of the rotating shaft, the sealing teeth are arranged at intervals in sequence along the axis direction of the rotating shaft;

[0011] Wherein, the minimum interval between two adjacent sealing teeth is w2, and w2 satisfies: 0.2 millimeter ≤ w2 ≤ 0.4 millimeter.

[0012] In some embodiments, the sealing teeth are annular; wherein, when the base body is the inner wall of the shaft hole, the sealing teeth are arranged around the axis of the shaft hole; when the base body is the outer wall of the rotating shaft, the sealing teeth are arranged around the axis of the rotating shaft;

[0013] And / or, the sealing teeth are self-lubricating material sealing teeth.

[0014] In some embodiments, the comb tooth sealing structure further includes an annular member, and the annular member is an independent component;

[0015] Wherein, when the base body is the inner wall of the shaft hole, the comb tooth sealing structure further includes a sleeve, the annular member is sleeved in the sleeve, the annular member has the shaft hole, and the annular member and the sleeve cooperate to form a shaft sleeve; when the base body is the outer wall of the rotating shaft, the annular member is sleeved on the outer wall of the rotating shaft so that the outer wall of the annular member constitutes a part of the outer wall of the rotating shaft; the sealing teeth are arranged on the outer wall of the annular member.

[0016] In some embodiments, the sealing teeth protrude from the annular member, and the wall thickness of the annular member is T, and T satisfies: 0.33 millimeter ≤ T ≤ 0.37 millimeter.

[0017] In some embodiments, the number of the sealing teeth is more than two, and they are arranged at intervals in sequence along the center line direction of the annular member; the annular member has opposite ends along its own center direction, which are the A end and the B end respectively. The sealing tooth closest to the A end among the sealing teeth is the first tooth, and the sealing tooth closest to the B end among the sealing teeth is the second tooth; the minimum distance from the first tooth to the end face of the A end is L1, and the minimum distance from the second tooth to the end face of the B end is L2. Wherein, L1 = L2, and L1 is less than w;

[0018] And / or, the length of the annular member is L, and L satisfies: 9.5 mm ≤ L ≤ 11.5 mm.

[0019] In some embodiments, the sealing teeth are integrally formed on the annular member, the sealing teeth and the annular member are made of the same material, and both are self-lubricating materials;

[0020] Wherein, when the base is the inner wall of the shaft hole, the annular member and the sleeve are made of different materials, and the annular member is integrally formed on the sleeve; when the base is the outer wall of the rotating shaft, the annular member and the rotating shaft are made of different materials, and the annular member is integrally formed on the rotating shaft.

[0021] The present invention also provides a compressor, which may include the comb tooth seal structure described in any one of the above;

[0022] Wherein, the compressor further includes a compression chamber and an impeller, the impeller is located in the compression chamber, and the impeller is fixedly sleeved on the rotating shaft, and the rotating shaft is used to be driven to drive the impeller to rotate so as to compress the fluid in the compression chamber;

[0023] One side of the compression chamber is provided with a first shaft hole penetrating through the interior, the other side of the compression chamber is provided with a second shaft hole penetrating through the interior, the axes of the first shaft hole and the second shaft hole coincide, and the rotating shaft is rotationally matched with both the first shaft hole and the second shaft hole;

[0024] Wherein, the comb tooth seal structure is provided at both the first shaft hole and the second shaft hole.

[0025] In some embodiments, the compressor is an air circulation machine.

[0026] A comb tooth seal structure and a compressor provided by the present invention have the following beneficial effects:

[0027] 1. By making 1 mm ≤ w ≤ 1.25 mm and 75° ≤ k ≤ 85°, the present invention makes the pressure difference P between the two ends of the shaft hole relatively large, so that the sealing effect of the sealing teeth is better, that is, in the actual application process, the gas leakage at the gap between the shaft hole and the rotating shaft can be reduced.

[0028] 2. Compared with the processing method of integrally forming the sealing teeth on the inner wall of the shaft hole of the shaft sleeve or the outer wall of the rotating shaft, the present invention separates the sealing teeth from the shaft sleeve or the rotating shaft by arranging the sealing teeth on the annular member. Among them, the sealing teeth can be integrally formed on the annular member. After the annular member is processed, the annular member with the sealing teeth is installed in the sleeve to form a shaft sleeve or sleeved on the rotating shaft to form a part of the rotating shaft. This split-type processing method can reduce the processing difficulty of the shaft sleeve or the rotating shaft.

[0029] 3. The sealing teeth can be made of materials with self-lubricating properties, such as graphite materials. In this way, when the rotating shaft vibrates too much or makes abnormal contact with the sealing teeth to cause dry friction, the occurrence of jamming can be effectively reduced, and to a certain extent, the rotating shaft is protected from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0031] Figure 1 It is a schematic diagram of the labyrinth seal structure sealing the gap between the shaft hole and the outer wall of the rotating shaft in the shaft hole through the sealing teeth;

[0032] Figure 2 It is a schematic diagram of the sealing teeth arranged on the base;

[0033] Figure 3 is Figure 2 a partial schematic diagram in

[0034] Figure 4 It is a partial structural schematic diagram of the compressor of the present invention;

[0035] Figure 5 It shows a curve graph of k and the pressure difference P between the two ends of the shaft hole when 1 mm ≤ w ≤ 1.25 mm and the air flow flows from end A to end B;

[0036] Figure 6 It shows the pressure nephograms when 1 mm ≤ w ≤ 1.25 mm, the air flow flows from end B to end A, and k = 45°, k = 64°, k = 84°, k = 102°, k = 121°, k = 140°.

[0037] The reference numerals are:

[0038] 1. Rotating shaft; 2. Impeller; 3. Bearing; 4. Volute; 5. Sealing teeth; 6. Sleeve; 61. Sleeve; 62. Ring; 11. First tooth; 12. Second tooth; 51. First surface; 52. Second surface; 71. First shaft hole; 72. Second shaft hole; 73. Compression chamber; 100. Labyrinth seal structure; 101. Outer wall of the rotating shaft; 102. Inner wall of the shaft hole; 103. Shaft hole; 104. Air inlet; 511. One end of the first surface; 512. The other end of the first surface; 521. One end of the second surface; 522. The other end of the second surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] For the convenience of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "beneath other devices or structures" afterwards. Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0042] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model.

[0043] Refer to in combination Figures 1-3As shown, according to an embodiment of the present utility model, a comb tooth sealing structure 100 is provided, which includes sealing teeth 5. The sealing teeth 5 are arranged on a base body, and the base body is the inner wall 102 of a shaft hole or the outer wall 101 of a rotating shaft. Among them, the sealing teeth 5 can protrude on the base body, that is, the sealing teeth 5 protrude on the inner wall 102 of the shaft hole or the outer wall 101 of the rotating shaft. Of course, the above-mentioned sealing teeth 5 can also be formed by grooving on the base body, that is, the above-mentioned sealing teeth 5 can be formed by grooving on the inner wall 102 of the shaft hole, or the above-mentioned sealing teeth 5 can be formed by grooving on the outer wall 101 of the rotating shaft.

[0044] The aforementioned sealing teeth 5 can be integrally formed on the base body, and the sealing teeth 5 can be annular. When the base body is the inner wall 102 of the shaft hole, the sealing teeth 5 are arranged around the axis of the shaft hole 103, and there is a gap between the rotating shaft 1 and the sealing teeth 5, and the rotating shaft 1 and the sealing teeth 5 are rotationally matched. When the base body is the outer wall 101 of the rotating shaft, the sealing teeth 5 are arranged around the axis of the rotating shaft 1, and there is a gap between the shaft hole 103 and the sealing teeth 5, and the sealing teeth 5 and the shaft hole 103 are rotationally matched. Among them, by sealing the sealing teeth 5 along the circumferential direction of the shaft hole 103 or the rotating shaft 1, the sealing effect can be improved.

[0045] The comb tooth sealing structure 100 of the present utility model seals the gap between the shaft hole 103 and the outer wall 101 of the rotating shaft inside the shaft hole 103 through the sealing teeth 5. In the present utility model, the aforementioned sealing teeth 5 are triangular teeth. As Figure 3 shown, the sealing teeth 5 have a first surface 51 and a second surface 52 that are symmetrically arranged. One end 511 of the first surface and one end 521 of the second surface are connected. Specifically, one end 511 of the first surface and one end 521 of the second surface can be directly connected, or one end 511 of the first surface and one end 521 of the second surface are connected through an arc section or a straight section, etc. The other end 512 of the first surface and the other end 522 of the second surface are relatively open and are both connected to the above-mentioned base body. When the base body is the inner wall 102 of the shaft hole, then the other end 512 of the first surface and the other end 522 of the second surface are both connected to the inner wall 102 of the shaft hole, and the distance between the first surface 51 and the first surface 51 gradually decreases inward along the radial direction of the shaft hole 103. When the base body is the outer wall 101 of the rotating shaft, then the other end 512 of the first surface and the other end 522 of the second surface are both connected to the outer wall 101 of the rotating shaft, and the distance between the first surface 51 and the second surface 52 gradually decreases outward along the radial direction of the rotating shaft 1.

[0046] The included angle between the above-mentioned first surface 51 and the second surface 52 is k, and the distance between the other end 512 of the first surface and the other end 522 of the second surface is w. Among them, 75° ≤ k ≤ 85°, and 1 mm ≤ w ≤ 1.25 mm. In a specific application example, k can be 84°. w can be 1.125 mm.

[0047] Among them, the pressure difference between the two ends of the shaft hole 103 is P. The larger P is, the better the sealing effect of the sealing teeth 5 is.

[0048] As Figure 2 shown, the aforementioned shaft hole 103 has opposite ends, namely end A and end B. Figure 5 shows a curve graph of k and the pressure difference P between the two ends of the shaft hole 103 when 1 mm ≤ w ≤ 1.25 mm and the air flow flows from end A to end B. It can be seen from Figure 5 that when 1 mm ≤ w ≤ 1.25 mm, if 75° ≤ k ≤ 85°, the pressure difference P between the two ends of the shaft hole 103 is relatively large, making the sealing effect of the sealing teeth 5 better, that is, the gas leakage at the gap between the shaft hole 103 and the rotating shaft 1 can be reduced during actual application. It can also be seen from Figure 5 that when 1 mm ≤ w ≤ 1.25 mm, if k = 84°, the pressure difference P between the two ends of the shaft hole 103 has a maximum value, which is 6233 Pa, so that the sealing teeth 5 have the best sealing effect.

[0049] Figure 6 shows the pressure nephograms when 1 mm ≤ w ≤ 1.25 mm and the air flow flows from end B to end A at k = 45°, k = 64°, k = 84°, k = 102°, k = 121°, k = 140°. It can be seen from Figure 6 that when k = 84°, the pressure difference P between the two ends of the shaft hole 103 has a maximum value. The pressure difference P at k = 45° is less than the pressure difference P at k = 64° which is less than the pressure difference P at k = 84°. The pressure difference P at k = 84° is greater than the pressure difference P at k = 102° which is greater than the pressure difference P at k = 121° which is greater than the pressure difference P at k = 140°.

[0050] In some embodiments, the aforementioned k and w also satisfy the following formula (1):

[0051] P = -a + b*k + c*w - d*k 2 -e*w 2 -f*k*w

[0052] Among them, P is the pressure difference between the two ends of the shaft hole 103, 2015.3 ≤ a ≤ 2016.3, 99.6 ≤ b ≤ 100.6, 5121.9 ≤ c ≤ 5122.9, 0.56 ≤ d ≤ 0.5, 249 ≤ e ≤ 252, 10.5 ≤ f ≤ 11.5. The unit of P is Pa, the unit of k is degree, and the unit of w is mm.

[0053] In the above example, the pressure difference P between the two ends of the shaft hole 103 reflects the sealing performance of the sealing teeth 5. According to the above formula (1), a three-dimensional surface diagram of the pressure difference P between the two ends of the shaft hole 103 with respect to k and w can be drawn. In some application scenarios, when the user needs to obtain the best sealing performance, the corresponding k and w values can be selected according to the above three-dimensional surface diagram for machining the sealing teeth 5. In some other application scenarios, it may be necessary to deliberately reduce the sealing performance of the sealing teeth 5 to cause gas leakage at the sealing teeth 5 for other purposes, such as dissipating heat inside the air circulator. And the pressure difference P between the two ends of the shaft hole 103 can be calculated based on the gas leakage amount. According to the pressure difference P and the above formula (1), the parameters k and w of the sealing teeth 5 can be selected, so that precise control of the gas leakage amount can be achieved.

[0054] In some embodiments, as Figure 2 shown, the number of the foregoing sealing teeth 5 can be more than two. Among them, when the foregoing base body is the inner wall 102 of the shaft hole, the sealing teeth 5 are arranged at intervals in sequence along the axis direction of the shaft hole 103. When the foregoing base body is the outer wall 101 of the rotating shaft, the sealing teeth 5 are arranged at intervals in sequence along the axis direction of the rotating shaft 1.

[0055] Among them, the minimum interval between two adjacent sealing teeth 5 is w2, and w2 satisfies: 0.2 mm ≤ w2 ≤ 0.4 mm. In a specific application example, w2 = 0.3 mm. Among them, the value of w2 is the tooth tip thickness of the triangular tooth, which is to ensure the strength of the comb teeth. If w2 is too large, the number of comb teeth will be insufficient, affecting the sealing performance; if w2 is too small, it will become a sharp tooth, which is prone to fracture and fall off under high pressure difference. Therefore, the appropriate width value range of w2 is given in the solution of the present invention.

[0056] In some embodiments, the foregoing sealing teeth 5 can be self-lubricating material sealing teeth. Specifically, the sealing teeth 5 can be made of a material with self-lubricating performance, such as made of graphite material. In this way, when the rotating shaft 1 vibrates too much or makes abnormal contact with the sealing teeth 5 to generate dry friction, the occurrence of jamming can be effectively reduced, and to a certain extent, the rotating shaft 1 is protected from being damaged.

[0057] In some embodiments, as Figure 1As shown, the comb tooth sealing structure 100 of the present utility model may further include an annular member 62, which is an independent component. Wherein, when the aforementioned base body is the inner wall 102 of the shaft hole, the comb tooth sealing structure 100 further includes a sleeve 61. The annular member 62 is fixedly sleeved in the sleeve 61. The annular member 62 has the aforementioned shaft hole 103. The annular member 62 and the sleeve 61 cooperate to form a shaft sleeve 6. When the aforementioned base body is the outer wall 101 of the rotating shaft, the annular member 62 is fixedly sleeved on the outer wall 101 of the rotating shaft, so that the outer wall of the annular member 62 constitutes a part of the outer wall of the rotating shaft 1. The aforementioned sealing teeth 5 are arranged on the outer wall of the annular member 62.

[0058] In the above example, compared with the processing method of integrally forming the sealing teeth 5 on the inner wall 102 of the shaft hole of the shaft sleeve or the outer wall 101 of the rotating shaft, the present utility model separates the sealing teeth 5 from the shaft sleeve 6 or the rotating shaft 1 by arranging the sealing teeth 5 on the annular member 62. Among them, the sealing teeth 5 can be integrally formed on the annular member 62. After the annular member 62 is processed, the annular member 62 with the sealing teeth 5 is installed into the sleeve 61 to form a shaft sleeve 6 or sleeved on the rotating shaft 1 to form a part of the rotating shaft 1. This kind of split processing method can reduce the processing difficulty of the shaft sleeve 6 or the rotating shaft 1.

[0059] In some embodiments, as Figure 1 shown, the aforementioned sealing teeth 5 protrude from the annular member 62. As Figure 2 shown, the wall thickness of the aforementioned annular member 62 is T, and T satisfies: 0.33 mm ≤ T ≤ 0.37 mm. Wherein, the wall thickness of the annular member 62 is the distance between the inner wall and the outer wall of the annular member 62. In a specific application example, T = 0.35 mm.

[0060] In the above example, by making 0.33 mm ≤ T ≤ 0.37 mm, it can be ensured that the rotating shaft 1 does not contact the sealing teeth 5 during rotation, and at the same time, the sealing effect of the sealing teeth 5 can be ensured. Among them, the function of the sealing teeth 5 is to increase the leakage flow resistance of the gap between the shaft hole 103 and the rotating shaft 1, and allow a little leakage to occur in the gap between the shaft hole 103 and the rotating shaft 1. And by making 0.33 mm ≤ T ≤ 0.37 mm, the flow area of the gap between the shaft hole 103 and the rotating shaft 1 can be restricted.

[0061] In some embodiments, as Figure 2 shown, the number of the aforementioned sealing teeth 5 is more than two, and they are arranged at intervals in sequence along the center line direction of the annular member 62. The annular member 62 has opposite ends along its own center direction, which are the A end and the B end respectively. The sealing tooth closest to the A end among the sealing teeth 5 is the first tooth 11, and the sealing tooth closest to the B end among the sealing teeth 5 is the second tooth 12. The minimum distance from the first tooth 11 to the end face of the A end is L1, and the minimum distance from the second tooth 12 to the end face of the B end is L2. Among them, L1 = L2, and L1 is less than w.

[0062] In the above example, by leaving a smooth section on both sides of the first tooth 11 and the second tooth 12, it is beneficial to ensure the structural strength of the first tooth 11 and the second tooth 12, and avoid the reduction of strength caused by the first tooth 11 and the second tooth 12 being too close to the edge of the annular member 62.

[0063] In a specific application example, as Figure 2 shown, the length of the aforementioned annular member 62 is L, and L satisfies: 9.5 mm ≤ L ≤ 11.5 mm. In a specific application example, L = 10.5 mm. It should be noted here that: the length L of the annular member 62 can be adjusted according to the actual situation, such as being lengthened or shortened, etc.

[0064] In some embodiments, as Figure 1 shown, the aforementioned sealing tooth 5 can be integrally formed on the annular member 62, so as to improve the connection stability between the sealing tooth 5 and the annular member 62. Among them, the materials of the sealing tooth 5 and the annular member 62 are the same, and both the sealing tooth 5 and the annular member 62 are self-lubricating materials. Among them, when the base is the inner wall 102 of the shaft hole, the materials of the aforementioned annular member 62 and the sleeve 61 are different, and the annular member 62 is integrally formed on the sleeve 61. When the base is the outer wall 101 of the rotating shaft, the materials of the aforementioned annular member 62 and the rotating shaft 1 are different, and the annular member 62 is integrally formed on the rotating shaft 1.

[0065] In the above example, by integrally forming the annular member 62 on the sleeve 61 or the rotating shaft 1, the connection stability between the annular member 62 and the sleeve 61 or the rotating shaft 1 can be improved. In addition, since the sleeve 61 and the rotating shaft 1 are generally made of metal materials such as aluminum, the structural strength of the sleeve 61 and the rotating shaft 1 can be improved. And the sealing tooth 5 and the annular member 62 can both be self-lubricating materials. In this way, when the rotating shaft 1 vibrates too much or contacts the sealing tooth 5 abnormally to generate dry friction, the occurrence of jamming can be effectively reduced, and the rotating shaft 1 can be protected from being damaged to a certain extent.

[0066] In some embodiments, as Figure 4As shown in the figure, the present utility model further provides a compressor, which may include the comb tooth seal structure 100 of any one of the above. Among them, the compressor further includes a compression chamber 73 and an impeller 2. The impeller 2 is located in the compression chamber 73, and the impeller 2 is fixedly sleeved on the rotating shaft 1. The rotating shaft 1 is used to be driven to drive the impeller 2 to rotate, so as to compress the fluid in the compression chamber 73. A first shaft hole 71 penetrating through the interior is provided on one side of the compression chamber 73, and a second shaft hole 72 penetrating through the interior is provided on the other side of the compression chamber 73. The axes of the first shaft hole 71 and the second shaft hole 72 coincide. The aforementioned rotating shaft 1 is rotationally matched with both the first shaft hole 71 and the second shaft hole 72. Among them, the aforementioned comb tooth seal structure 100 is provided at both the first shaft hole 71 and the second shaft hole 72. Specifically, the aforementioned seal teeth 5 are provided on the hole wall of the first shaft hole 71 or the outer wall of the rotating shaft 1 in the first shaft hole, and the aforementioned seal teeth 5 are provided on the hole wall of the second shaft hole 72 or the outer wall of the rotating shaft 1 in the second shaft hole.

[0067] In the above example, due to the adoption of the above comb tooth seal structure 100 by the compressor, the sealing performance of the seal teeth 5 can be improved.

[0068] It should be noted here that: as Figure 4 shown, the compressor further includes a volute 4. The volute 4 has the aforementioned compression chamber 73, and the volute 4 also has an air inlet 104 communicating with the compression chamber 73. The compressor also has a bearing 3 for supporting the rotating shaft 1. The bearing 3 may be an air bearing.

[0069] In a specific application example, the aforementioned compressor may be an air circulator. Among them, an air circulator is a compressor used for compressing air for cycle refrigeration.

[0070] As Figure 4 shown, the aforementioned compressor, such as an air circulator, intakes air from the air inlet 104, and the air flow is compressed and worked by the left impeller 2. Inside the compression chamber 73, the first shaft hole 71 and the second shaft hole 72 are respectively provided on the left and right sides of the compression chamber 73, and the aforementioned comb tooth seal structure 100 is provided at both the first shaft hole 71 and the second shaft hole 72 to isolate the air flow environment. The comb tooth seal structure 100 can ensure that no large amount of leakage occurs at both the first shaft hole 71 and the second shaft hole 72 of the compressor, thereby ensuring the performance of the compressor.

[0071] Those skilled in the art can easily understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0072] The above are only the 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 principle of the present utility model shall be included within the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and variations can still be made, and these improvements and variations should also be regarded as the protection scope of the present utility model.

Claims

1. A comb-tooth sealing structure, comprising sealing teeth (5), wherein the sealing teeth (5) are arranged on a substrate, wherein the substrate is an inner wall (102) of an axial hole or an outer wall (101) of a rotating shaft, and the comb-tooth sealing structure seals a gap between the axial hole (103) and the outer wall (101) of the rotating shaft in the axial hole (103) through the sealing teeth (5); characterized in that: The sealing tooth (5) is a triangular tooth; the sealing tooth (5) has a first surface (51) and a second surface (52) which are symmetrically arranged; one end (511) of the first surface is connected to one end (521) of the second surface; the other end (512) of the first surface and the other end (522) of the second surface are relatively open and both are connected to the base; when the base is the inner wall (102) of the shaft hole, the distance between the first surface (51) and the first surface (51) gradually decreases inwardly along the radial direction of the shaft hole (103); when the base is the outer wall (101) of the shaft, the distance between the first surface (51) and the second surface (52) gradually decreases outwardly along the radial direction of the shaft (1); The angle between the first surface (51) and the second surface (52) is k, and the distance between the other end (512) of the first surface and the other end (522) of the second surface is w; wherein 75°≤k≤85°, and 1 mm≤w≤1.25 mm.

2. The comb teeth sealing structure according to claim 1, characterized in that: The k and w also satisfy the following formula: P=-a+b*k+c*w-d*k 2 -e*w 2 -f*k*w Wherein, P is the pressure difference between the two ends of the shaft hole (103), 2015.3≤a≤2016.3, 99.6≤b≤100.6, 5121.9≤c≤5122.9, 0.56≤d≤0.5, 249≤e≤252, 10.5≤f≤11.5, the unit of P is Pa, the unit of k is degree, and the unit of w is millimeter.

3. The comb teeth sealing structure according to claim 1 or 2, characterized in that: The number of the sealing teeth (5) is more than two; wherein, when the base is the inner wall (102) of the shaft hole, the sealing teeth (5) are arranged in sequence and spaced apart along the axial direction of the shaft hole (103); and when the base is the outer wall (101) of the rotating shaft, the sealing teeth (5) are arranged in sequence and spaced apart along the axial direction of the rotating shaft (1); The minimum interval between two adjacent sealing teeth (5) is w2, and w2 satisfies: 0.2 mm≤w2≤0.4 mm.

4. The comb teeth sealing structure according to claim 1 or 2, characterized in that: The sealing teeth (5) are annular; when the base is the inner wall (102) of the shaft hole, the sealing teeth (5) are arranged around the axis of the shaft hole (103); when the base is the outer wall (101) of the rotating shaft, the sealing teeth (5) are arranged around the axis of the rotating shaft (1); And / or, the sealing teeth (5) are sealing teeth made of self-lubricating material.

5. The comb teeth sealing structure according to claim 1 or 2, characterized in that: The comb teeth sealing structure further comprises an annular member (62), wherein the annular member (62) is an independent member; Wherein, when the base is the inner wall (102) of the shaft hole, the comb tooth sealing structure also includes a sleeve (61), the annular component (62) is sleeved in the sleeve (61), the annular component (62) has the shaft hole (103), and the annular component (62) cooperates with the sleeve (61) to form a shaft sleeve (6); when the base is the outer wall (101) of the rotating shaft, the annular component (62) is sleeved on the outer wall (101) of the rotating shaft so that the outer wall of the annular component (62) constitutes a part of the outer wall of the rotating shaft (1); the sealing teeth (5) are arranged on the outer wall of the annular component (62).

6. The comb teeth sealing structure according to claim 5, characterized in that: The sealing teeth (5) are protruding from the annular member (62), and the wall thickness of the annular member (62) is T, where T satisfies: 0.33 mm ≤ T ≤ 0.37 mm.

7. The comb teeth sealing structure according to claim 5, characterized in that: The number of the sealing teeth (5) is more than two, and they are arranged in sequence and at intervals along the center line direction of the annular member (62); the annular member (62) has two opposite ends along its own center direction, namely, end A and end B; the sealing tooth closest to end A among the sealing teeth (5) is the first tooth (11), and the sealing tooth closest to end B among the sealing teeth (5) is the second tooth (12); the minimum distance between the first tooth (11) and the end surface of the end A is L1, and the minimum distance between the second tooth (12) and the end surface of the end B is L2, wherein L1=L2, and L1 is less than w; And / or, the length of the annular member (62) is L, and L satisfies: 9.5 mm≤L≤11.5 mm.

8. The comb teeth sealing structure according to claim 5, characterized in that: The sealing teeth (5) are integrally formed on the annular member (62); the sealing teeth (5) and the annular member (62) are made of the same material, and both are self-lubricating materials; Wherein, when the base is the inner wall (102) of the shaft hole, the material of the annular component (62) and the sleeve (61) are different, and the annular component (62) is integrally formed on the sleeve (61); when the base is the outer wall (101) of the rotating shaft, the material of the annular component (62) and the rotating shaft (1) are different, and the annular component (62) is integrally formed on the rotating shaft (1).

9. A compressor, characterized in that: A comb teeth sealing structure (100) comprising any one of claims 1 to 8; The compressor further comprises a compression chamber (73) and an impeller (2), wherein the impeller (2) is located in the compression chamber (73), and the impeller (2) is sleeved on the rotating shaft (1), and the rotating shaft (1) is used to be driven to drive the impeller (2) to rotate so as to compress the fluid in the compression chamber (73); A first shaft hole (71) is provided on one side of the compression chamber and passes through the interior, and a second shaft hole (72) is provided on the other side of the compression chamber and passes through the interior, the axes of the first shaft hole (71) and the second shaft hole (72) coincide with each other, and the rotating shaft (1) is rotatably matched with both the first shaft hole (71) and the second shaft hole (72); Wherein, the comb teeth sealing structure (100) is provided at both the first shaft hole (71) and the second shaft hole (72).

10. The compressor according to claim 9, characterized in that: The compressor is an air cycle machine.

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