Pump

Abstract

To provide a pump capable of making compatible improvement of a seal performance of a seal member and improvement of easiness in inserting a pump body part into an external casing.SOLUTION: A pump comprises an external casing and a pump body part. The pump body part includes a casing cover and a seal member. An outer surface of the casing cover includes a seal supporting surface. An inner surface of the external casing includes a seal contact surface. The seal supporting surface includes a first supporting surface and a second supporting surface which is positioned in a removal direction of insertion and removal directions of the pump body part with respect to the first supporting surface. The seal member is pressed in the removal direction by a liquid, which is pressurized by the pump body part, and movable from a position of supporting by the first supporting surface to a position of supporting by the second supporting surface. A crush margin of the seal member being supported by the second supporting surface is larger than a crush margin of the seal member being supported by the first supporting surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to pumps. [Background technology]

[0002] Back-pullout pumps have been known in the past, in which the pump body can be easily removed from the outer casing for maintenance. Patent Document 1 discloses this type of pump. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-95699 Summary of the Invention [Problem to be solved by the invention]

[0004] In a pump such as that described in Patent Document 1, it is conceivable to provide a seal member between the outer casing and the pump main body. To ensure the sealing performance of this seal member, it is preferable that the seal member have a certain degree of compression allowance. However, if the compression allowance of the seal member is large, it may become difficult to insert the pump main body into the outer casing.

[0005] An object of the present disclosure is to provide a pump that can achieve both improved sealing performance of a sealing member and improved ease of insertion of a pump main body into an outer casing. [Means for solving the problem]

[0006] A pump according to a first aspect of the present disclosure includes: (1) an outer casing defining an accommodation space having an attachment port that opens to the outside; a pump main body that is inserted into the accommodation space through the mounting port and is capable of pressurizing the liquid accommodated in the accommodation space, The pump body includes: a casing cover capable of closing the mounting opening; a seal member that is supported by the casing cover and is sandwiched between the outer casing and the casing cover to seal the gap between the outer casing and the casing cover, an outer surface of the casing cover having a seal support surface that supports the seal member; an inner surface of the outer casing having a seal contact surface with which the seal member supported on the seal support surface comes into contact; the seal support surface includes a first support surface and a second support surface positioned in a removal direction of the insertion / removal direction of the pump body relative to the first support surface, the seal member is pressed in the removal direction by liquid pressurized by the pump body in the accommodation space, and is movable from a position supported by the first support surface to a position supported by the second support surface, In the pump, a compression allowance of the seal member when supported by the second support surface is larger than the compression allowance of the seal member when supported by the first support surface.

[0007] In one embodiment of the present disclosure, the pump comprises: (2) the first support surface and the second support surface extend parallel or substantially parallel to the insertion / removal direction, The pump described in (1) above, wherein the distance between the second support surface and the seal contact surface in a perpendicular direction perpendicular to the insertion / removal direction is smaller than the distance between the first support surface and the seal contact surface in the perpendicular direction.

[0008] In one embodiment of the present disclosure, the pump comprises: (3) The pump according to (2) above, wherein the gap between the second support surface and the seal contact surface is 0.1 to 0.3 mm smaller than the gap between the first support surface and the seal contact surface.

[0009] In one embodiment of the present disclosure, the pump comprises: (4) The pump according to (2) or (3) above, wherein the seal support surface includes an inclined surface connecting the first support surface and the second support surface.

[0010] In one embodiment of the present disclosure, the pump comprises: (5) The pump according to (4) above, wherein the inclined surface has an angle of inclination of 30 to 60 degrees with respect to the insertion / removal direction.

[0011] In one embodiment of the present disclosure, the pump comprises: (6) the casing cover defines a central axis along the insertion / removal direction and includes a claw portion that is convex radially outward from the central axis, The pump is one described in any one of (1) to (5) above, wherein the outer casing has a recess through which the claw portion can pass, and a protrusion whose circumferential position aligns with the claw portion when the pump main body is rotated circumferentially around the central axis with the claw portion passing through the recess.

[0012] In one embodiment of the present disclosure, the pump comprises: (7) The claw portions are arranged at different positions in the circumferential direction, In the pump according to (6) above, a plurality of the protrusions are arranged at positions corresponding to the plurality of claws in the circumferential direction.

[0013] In one embodiment of the present disclosure, the pump comprises: (8) The pump according to (7) above, wherein the plurality of claws are arranged at equal intervals in the circumferential direction. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to provide a pump that can achieve both improved sealing performance of the sealing member and improved ease of insertion of the pump main body into the outer casing. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view of a pump according to one embodiment of the present disclosure; FIG. [Figure 2] 2 is an exploded perspective view showing the pump shown in FIG. 1 disassembled into an outer casing and a pump main body. FIG. [Figure 3] 2 is a partial cross-sectional view showing a part of the side view of the pump in the state shown in FIG. 1; FIG. [Figure 4] 3 is a partial cross-sectional view showing a part of the side view of the pump in the state shown in FIG. 2.

[0023] FIG. [Figure 5A] FIG. 4 is an enlarged view of the X portion of FIG. [Figure 5B] FIG. 5B is an enlarged view of the Y portion of FIG. 5A. [Figure 6A] 2 is a view showing a state in which the seal member is supported by a first support surface in the pump in the state shown in FIG. 1. FIG. [Figure 6B] 6B is a diagram showing a state in which the seal member has moved in the removal direction from the state shown in FIG. 6A and is supported by a second support surface. FIG. [Figure 7A] FIG. 4 is a cross-sectional view taken along line II in FIG. 3. [Figure 7B] 7B is a diagram showing a state in which the pump body is rotated in the circumferential direction of the casing cover from the state shown in FIG. 7A. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of a pump according to the present disclosure will be described with reference to the drawings, in which the same components are designated by the same reference numerals.

[0017] Fig. 1 is a perspective view of a pump 1 as one embodiment of a pump according to the present disclosure. As shown in Fig. 1, the pump 1 includes an outer casing 10 and a pump main body 20. Fig. 1 shows the pump 1 assembled for use, with the pump main body 20 inserted into the outer casing 10. The pump 1 can be used, for example, as a water supply pump, but its intended use is not particularly limited.

[0018] 2 is an exploded perspective view showing the pump 1 disassembled into the outer casing 10 and the pump main body 20. As shown in FIG. 2, the pump 1 is disassembled by removing the pump main body 20 from the outer casing 10. In this manner, the pump 1 of this embodiment is a so-called back pull-out type pump, which allows for easy maintenance of the pump main body 20 by removing the pump main body 20 from the outer casing 10.

[0019] For ease of explanation, the state of pump 1 shown in Figure 1 will be referred to as the "assembled state," and the state of pump 1 shown in Figure 2 will be referred to as the "disassembled state." Furthermore, the direction in which pump main body 20 is inserted into outer casing 10 will be referred to as the "insertion direction A1," the direction in which pump main body 20 is removed from outer casing 10, which is the opposite direction to insertion direction A1, will be referred to as the "removal direction A2," the combined direction of insertion direction A1 and removal direction A2 will be referred to as the "insertion / removal direction A," and the direction perpendicular to insertion / removal direction A will be referred to as the "orthogonal direction B."

[0020] Figure 3 is a partial cross-sectional view showing a part of a side view of the assembled pump 1. Figure 4 is a partial cross-sectional view showing a part of a side view of the disassembled pump 1.

[0021] First, an overview of the pump 1 will be described. Unless otherwise specified, the pump 1 will be described below in its assembled state.

[0022] As shown in Figures 3 and 4, the outer casing 10 defines a storage space 11 capable of storing liquid. The storage space 11 includes an inlet 11a, an outlet 11b, and an attachment port 11c, which open to the outside of the outer casing 10. The inlet 11a opens in the insertion direction A1. The outlet 11b opens in the perpendicular direction B. The attachment port 11c opens in the removal direction A2. The portion of the outer casing 10 defining the inlet 11a includes an inlet flange 12 to which other piping components can be connected. Similarly, the portion of the outer casing 10 defining the outlet 11b includes an outlet flange 13 to which other piping components can be connected. As shown in Figures 1 and 2, legs 14 protrude from the outer surface of the outer casing 10. The legs 14 are configured to be fixed to a base or the like with fastening members such as bolts.

[0023] As shown in FIGS. 3 and 4, the pump main body 20 includes a motor 21, a casing cover 22, a sealing mechanism 23, a sealing member 24, and a pressurizing unit 25.

[0024] The motor 21 includes a motor main body 21a and a motor shaft 21b that protrudes from the motor main body 21a in the insertion direction A1. For ease of explanation, the direction around the central axis O1 of the motor shaft 21b will be referred to as the "circumferential direction C1 of the motor shaft 21b." Additionally, the radial direction of an imaginary circle centered on the central axis O1 of the motor shaft 21b will be referred to as the "radial direction D1 of the motor shaft 21b."

[0025] When the motor 21 is driven, the motor shaft 21b rotates in the circumferential direction C1 of the motor shaft 21b. The casing cover 22 is attached to the motor main body 21a with the motor shaft 21b passing through it. The casing cover 22 is capable of closing the mounting opening 11c of the external casing 10. The sealing mechanism 23 is attached to the casing cover 22 with the motor shaft 21b passing through it. The sealing mechanism 23 prevents liquid from leaking between the motor shaft 21b and the casing cover 22 while the pump 1 is in operation. Examples of the sealing mechanism 23 include, but are not limited to, mechanical seals, oil seals, and gland packings. The sealing member 24 is a string-like elastic member that extends endlessly. The sealing member 24 is supported by the casing cover 22. The sealing member 24 is sandwiched between the external casing 10 and the casing cover 22 to seal the gap between the external casing 10 and the casing cover 22. The seal member 24 seals the gap between the outer casing 10 and the casing cover 22, thereby preventing liquid from leaking between them. The seal member 24 in this embodiment is an O-ring 24a.

[0026] The pressurizing unit 25 can be inserted into the accommodation space 11 of the outer casing 10 through the attachment opening 11c of the outer casing 10. The pressurizing unit 25 can pressurize the liquid accommodated in the accommodation space 11 when it is disposed in the accommodation space 11 of the outer casing 10 (i.e., when the pump 1 is assembled).

[0027] More specifically, the pressurizing unit 25 includes an impeller 41, an inner casing 42, and a liner ring 43. The impeller 41 is fixed to the motor shaft 21b and is rotatable together with the motor shaft 21b in the circumferential direction C1 of the motor shaft 21b. The pressurizing unit 25 of this embodiment includes two impellers 41 spaced apart in the insertion / removal direction A. The inner casing 42 is attached to the casing cover 22. The inner casing 42 covers the periphery of the impeller 41 in the radial direction D1 of the motor shaft 21b. The inner casing 42 of this embodiment includes two partial casings 42a stacked along the insertion / removal direction A. One impeller 41 is disposed inside each of the two partial casings 42a. One liner ring 43 is attached to each of the two partial casings 42a. The liner ring 43 is disposed between the impeller 41 and the partial casing 42a in the radial direction D1 of the motor shaft 21b, thereby preventing the liquid from flowing back between the impeller 41 and the partial casing 42a. Note that backflow means the liquid flowing in the direction toward the suction port 11a, i.e., in the insertion direction A1.

[0028] The configuration of the pressurizing unit 25 is not particularly limited and can be modified in various ways. For example, the pump 1 of this embodiment includes two impellers 41, two partial casings 42a, and two liner rings 43, but may include one of each, or three or more of each.

[0029] In the pump 1, when the motor 21 is driven, the impeller 41 rotates together with the motor shaft 21b. This causes the liquid contained in the accommodation space 11 of the outer casing 10 to be pressurized. The pressurized liquid contained in the accommodation space 11 moves from the suction port 11a toward the discharge port 11b. As a result, the liquid is sucked in through the suction port 11a and discharged through the discharge port 11b. In this way, the liquid can be pumped.

[0030] Next, the details of the portions of the outer casing 10 and the casing cover 22 where the seal member 24 is disposed will be described. Fig. 5A is an enlarged view of portion X in Fig. 3. Fig. 5B is an enlarged view of portion Y in Fig. 5A. Fig. 6A is a view showing a state in which the seal member 24 is supported by the first support surface 30a in the assembled state of the pump 1. Fig. 6B is a view showing a state in which the seal member 24 has moved in the removal direction A2 from the state shown in Fig. 6A and is supported by the second support surface 30b. For ease of explanation, the seal member 24 is not shown in Figs. 5A and 5B.

[0031] As shown in FIGS. 5A to 6B, the outer surface of the casing cover 22 has a seal support surface 30 that supports the seal member 24. The seal support surface 30 is a part of the outer surface of the casing cover 22. The seal support surface 30 of this embodiment is a portion of the outer surface of the casing cover 22 that comes into contact with the seal member 24 and supports the seal member 24 in the orthogonal direction B. More specifically, an annular groove in which the seal member 24 is housed is formed on the outer surface of the casing cover 22 of this embodiment. The seal support surface 30 of this embodiment is formed by the bottom surface of this annular groove that faces the orthogonal direction B.

[0032] As shown in FIGS. 5A to 6B , the inner surface of the outer casing 10 has a seal contact surface 15 that comes into contact with the seal member 24 supported by the seal support surface 30 of the casing cover 22. The seal contact surface 15 is a part of the inner surface of the outer casing 10. In this embodiment, the seal contact surface 15 is a portion of the inner surface of the outer casing 10 that faces the seal support surface 30 when the pump 1 is assembled. The seal contact surface 15 can sandwich the seal member 24 between itself and the seal support surface 30. The seal contact surface 15 in this embodiment can sandwich the seal member 24 between itself and the seal support surface 30 in the orthogonal direction B. More specifically, in this embodiment, an annular rib is provided on the inner surface of the outer casing 10 that closes the annular groove of the casing cover 22 in which the seal member 24 is housed when the pump 1 is assembled. In this embodiment, the seal contact surface 15 is formed by the top surface of this annular rib that faces the orthogonal direction B. The seal contact surface 15 of this embodiment extends parallel or approximately parallel to the insertion / removal direction A. The seal contact surface 15 of this embodiment is configured so that the outer shape when viewed from the insertion / removal direction A is uniform regardless of the position in the insertion / removal direction A.

[0033] In the pump 1, the seal between the external casing 10 and the casing cover 22 can be achieved by sandwiching and compressing the seal member 24 between the seal support surface 30 on the outer surface of the casing cover 22 and the seal contact surface 15 on the inner surface of the external casing 10. In this embodiment, the seal member 24 seals between the external casing 10 and the casing cover 22, thereby sealing between the external casing 10 and the pump main body 20 and preventing liquid from leaking between the external casing 10 and the pump main body 20.

[0034] As shown in FIGS. 5A to 6B , the seal support surface 30 includes a first support surface 30a and a second support surface 30b positioned in the removal direction A2 relative to the first support surface 30a. The seal support surface 30 is configured so that the compression margin of the seal member 24 when supported by the second support surface 30b is larger than the compression margin of the seal member 24 when supported by the first support surface 30a. More specifically, in this embodiment, the seal member 24 is sandwiched between the first support surface 30a and the seal contact surface 15, thereby becoming compressed. In this embodiment, the seal member 24 is sandwiched between the second support surface 30b and the seal contact surface 15, thereby becoming more compressed than when supported by the first support surface 30a. The compression margin of the seal member 24 is a numerical value that represents the amount of reduction in thickness of the seal member 24 when compressed. For example, the compression allowance of the seal member 24 when supported by the first support surface 30a is calculated by subtracting the distance L1 (see FIG. 5A) between the seal contact surface 15 of the outer casing 10 and the first support surface 30a of the casing cover 22 in the perpendicular direction B from the thickness of the seal member 24 in its natural state when it is not compressed and no external force is applied. The compression allowance of the seal member 24 when supported by the second support surface 30b is calculated by subtracting the distance L2 (see FIG. 5A) between the seal contact surface 15 of the outer casing 10 and the second support surface 30b of the casing cover 22 in the perpendicular direction B from the thickness of the seal member 24 in its natural state when it is not compressed and no external force is applied. Note that, because the seal member 24 in this embodiment is an O-ring 24a, the definition of the compression allowance in this embodiment is the same as the definition of "O-ring compression allowance" described in JIS B 0116:2020.

[0035] The first support surface 30a and the second support surface 30b in this embodiment extend parallel or approximately parallel to the insertion / removal direction A. The distance in the orthogonal direction B between the second support surface 30b and the seal contact surface 15 in this embodiment is smaller than the distance in the orthogonal direction B between the first support surface 30a and the seal contact surface 15. This allows the compressive allowance of the seal member 24 when supported by the second support surface 30b to be larger than the compressive allowance of the seal member 24 when supported by the first support surface 30a.

[0036] The distance between the second support surface 30b and the seal contact surface 15 in the orthogonal direction B may be set to be 0.1 to 0.3 mm, more preferably 0.15 to 0.25 mm, smaller than the distance between the first support surface 30a and the seal contact surface 15 in the orthogonal direction B.

[0037] As shown in FIG. 5B , the seal support surface 30 includes an inclined surface 30c connecting the first support surface 30a and the second support surface 30b. More specifically, the inclined surface 30c is disposed between the first support surface 30a and the second support surface 30b in the insertion / removal direction A and connects them together. The second support surface 30b of this embodiment has a slightly larger outer shape than the first support surface 30a when viewed in the insertion / removal direction A. More specifically, the seal support surface 30 of the casing cover 22 of this embodiment has a circular outer shape in a cross section perpendicular to the insertion / removal direction A. The first support surface 30a and the second support surface 30b are configured by outer peripheral surfaces. The diameter of the second support surface 30b of this embodiment is larger than the diameter of the first support surface 30a of this embodiment. The inclined surface 30c of this embodiment is a tapered surface whose diameter increases as it approaches the removal direction A2.

[0038] The inclination angle α (see FIG. 5B) of the inclined surface 30c with respect to the insertion / removal direction A may be set to 30 to 60 degrees, more preferably 40 to 50 degrees. The inclination angle α means the acute angle that the inclined surface 30c forms with respect to an imaginary plane parallel to the insertion / removal direction A.

[0039] 5A, 6A, and 6B, the casing cover 22 of this embodiment has seal retaining walls 32 that protrude in the perpendicular direction B from both ends of the seal support surface 30 in the insertion / removal direction A. That is, on the outer surface of the casing cover 22 of this embodiment, two seal retaining walls 32 form an annular groove that can accommodate the seal member 24. The seal support surface 30 of this embodiment is formed by the bottom surface of this annular groove. The seal member 24 comes into contact with the seal retaining walls 32, thereby restricting movement in the insertion / removal direction A. Therefore, the seal member 24 is maintained in a state where it is supported on the seal support surface 30 by the seal retaining walls 32.

[0040] The seal contact surface 15 of the outer casing 10 in this embodiment is an inner circumferential surface that has a circular outer shape when viewed from the insertion / removal direction A. Specifically, as described above, the seal contact surface 15 in this embodiment is an inner circumferential surface that closes the annular groove in the casing cover 22 when the pump 1 is assembled. More specifically, as described above, the seal contact surface 15 in this embodiment is formed by the top surface of the annular rib that closes the annular groove in the casing cover 22 when the pump 1 is assembled. The diameter of the seal contact surface 15 in this embodiment is uniform in the insertion / removal direction A.

[0041] (Action and effect) When using the pump 1 of this embodiment, the pump main body 20 is inserted into the accommodation space 11 of the outer casing 10, and the pump 1 is assembled. At this time, the seal member 24 is supported by the first support surface 30a of the seal support surface 30 of the casing cover 22 (see FIG. 6A). Next, when the motor 21 is driven, the liquid contained in the accommodation space 11 of the outer casing 10 is pressurized by the pump main body 20. As a result, the seal member 24 is pressed in the removal direction A2 by the liquid pressurized by the pump main body 20 and moves from a position supported by the first support surface 30a to a position supported by the second support surface 30b (see FIG. 6B). In other words, when the liquid contained in the accommodation space 11 of the outer casing 10 is pressurized by the pump main body 20, the seal member 24 changes from a position supported by the first support surface 30a to a position supported by the second support surface 30b. When the seal member 24 is supported by the second support surface 30b, the compression margin of the seal member 24 becomes larger than when the seal member 24 is supported by the first support surface 30a.

[0042] As described above, according to the pump 1 of this embodiment, when the pump main body 20 is inserted into the external casing 10, the seal member 24 is supported by the first support surface 30a, and when the pump 1 is operating, the seal member 24 is supported by the second support surface 30b using the liquid pressurized by the pump main body 20. As a result, when the pump main body 20 is inserted into the external casing 10, an increase in the compression allowance of the seal member 24 is suppressed, thereby reducing the frictional resistance generated between the seal contact surface 15 of the external casing 10 and the seal member 24, and when the pump 1 is operating, the compression allowance of the seal member 24 is increased, thereby improving the sealing performance of the seal member 24. This makes it possible to achieve both improved sealing performance of the seal member 24 and easier insertion of the pump main body 20 into the external casing 10.

[0043] Furthermore, pump 1 of this embodiment includes inclined surface 30c connecting first support surface 30a and second support surface 30b. This prevents seal member 24 from getting caught at the boundary between first support surface 30a and second support surface 30b and being hindered from moving when seal member 24 is pressed in removal direction A2 by the liquid pressurized by pump body 20.

[0044] Next, the structure for connecting the outer casing 10 and the pump main body 20 will be described in detail.

[0045] The casing cover 22 of this embodiment defines a central axis O2 along the insertion / removal direction A. The seal support surface 30 of this embodiment is configured by a circumferential surface centered on the central axis O2. For ease of explanation, the direction around the central axis O2 of the casing cover 22 will be referred to as the "circumferential direction C2 of the casing cover 22," and the radial direction of an imaginary circle centered on the central axis O2 of the casing cover 22 will be referred to as the "radial direction D2 of the casing cover 22." Note that in this embodiment, the central axis O2 of the casing cover 22 and the central axis O1 of the motor shaft portion 21b approximately coincide with each other. Therefore, the circumferential direction C2 of the casing cover 22 is the same as the circumferential direction C1 of the motor shaft portion 21b, and the radial direction D2 of the casing cover 22 is the same as the radial direction D1 of the motor shaft portion 21b. However, the central axis O2 of the casing cover 22 and the central axis O1 of the motor shaft portion 21b do not have to coincide with each other.

[0046] FIG. 7A is a cross-sectional view taken along line II in FIG. 3. FIG. 7B is a view showing a state in which the pump body 20 has been rotated in the circumferential direction C2 of the casing cover 22 from the state shown in FIG. 7A. As shown in FIGS. 7A and 7B, the casing cover 22 of this embodiment includes a claw portion 35 that protrudes outward in the radial direction D2 of the casing cover 22. The outer casing 10 of this embodiment includes a recessed portion 16 that recesses outward in the radial direction D2 of the casing cover 22 and a protruding portion 17 that protrudes inward in the radial direction D2 of the casing cover 22. The recessed portion 16 of this embodiment is defined between two protruding portions 17 adjacent to each other in the circumferential direction C2 of the casing cover 22. The recessed portion 16 is configured to allow the claw portion 35 of the casing cover 22 to pass through in the insertion direction A1. The protruding portions 17 and the recessed portions 16 of the outer casing 10 of this embodiment are located at the same position in the insertion / removal direction A. The outer casing 10 of this embodiment includes an annular groove portion 18 (see FIGS. 2, 4, etc.) disposed adjacent to the protrusion 17 and the recess 16 in the insertion direction A1.

[0047] (Action and effect) When connecting the outer casing 10 and the pump main body 20 of this embodiment, first, with the pump 1 in a disassembled state, the claws 35 of the casing cover 22 are aligned with the recesses 16 of the outer casing 10 in the circumferential direction C2 of the casing cover 22 (see FIG. 7B ). Next, in this state, the pump main body 20 is inserted into the outer casing 10. As a result, the claws 35 of the casing cover 22 pass through the recesses 16 of the outer casing 10 and are positioned in the annular groove 18. In other words, the claws 35 of the casing cover 22 are positioned further in the insertion direction A1 than the protrusions 17 of the outer casing 10. In this state, when the pump main body 20 is rotated in the circumferential direction C2 of the casing cover 22, the claws 35 of the casing cover 22 move inside the annular groove 18 of the outer casing 10, and the positions of the convex portions 17 of the outer casing 10 and the claws 35 of the casing cover 22 in the circumferential direction C2 of the casing cover 22 are aligned (see FIG. 7A). In other words, the convex portions 17 of the outer casing 10 and the claws 35 of the casing cover 22 overlap in the insertion / removal direction A (see FIG. 7A). As a result, the movement of the claws 35 of the casing cover 22 in the removal direction A2 is restricted by the convex portions 17 of the outer casing 10, and the pump main body 20 is connected to the external casing 10 so that it will not come off in the removal direction A2.

[0048] As described above, according to the pump 1 of this embodiment, simply inserting the pump main body 20 into the outer casing 10 and rotating it can prevent the pump main body 20 from falling off in the removal direction A2 from the outer casing 10. This allows the pump main body 20 to be connected to the outer casing 10 without using fastening members such as bolts. Furthermore, simply rotating the pump main body 20 can release the connected state and remove the pump main body 20 from the outer casing 10. In other words, the pump 1 can be easily switched between an assembled state and a disassembled state, improving the maintainability of the pump 1.

[0049] As described above, in the pump 1 of this embodiment, the outer casing 10 and the pump main body 20 can be connected without using fastening members such as bolts. However, if fastening members such as bolts are not used, a gap between the outer casing 10 and the pump main body 20 may cause the pump main body 20 to vibrate and generate noise during operation of the pump 1. In contrast, in the pump 1 of this embodiment, the seal member 24 is disposed between the seal contact surface 15 and the seal support surface 30. As a result, the pump main body 20 is pressed by the seal member 24 from the outside in the radial direction D2 of the casing cover 22, which prevents the pump main body 20 from vibrating and generating noise during operation of the pump 1.

[0050] In this embodiment, the claw portions 35 of the casing cover 22 are arranged in multiple positions at different locations in the circumferential direction C2 of the casing cover 22. Furthermore, in this embodiment, the protrusions 17 of the outer casing 10 are arranged in multiple positions in the circumferential direction C2 of the casing cover 22 corresponding to the multiple claw portions 35. More specifically, the outer casing 10 of this embodiment has multiple recesses 16 through which the multiple claw portions 35 of the casing cover 22 can simultaneously pass in the insertion / removal direction A. Furthermore, the outer casing 10 of this embodiment has multiple protrusions 17 on which the multiple claw portions 35 of the casing cover 22 can simultaneously overlap in the insertion / removal direction A. In this manner, movement of the pump main body 20 in the removal direction A2 can be restricted by the multiple claw portions 35 and the multiple protrusions 17, and the stability of the connection between the pump main body 20 and the outer casing 10 can be improved compared to when movement of the pump main body 20 in the removal direction A2 is restricted by one claw portion 35 and one protrusion 17. As an example, the pump 1 of this embodiment includes six claws 35, six recesses 16, and six protrusions 17, but the numbers of claws 35, recesses 16, and protrusions 17 are not particularly limited. The numbers of claws 35, recesses 16, and protrusions 17 may also vary.

[0051] In this embodiment, the seal retaining walls 32 positioned in the removal direction A2 relative to the seal support surface 30 are arranged intermittently in the circumferential direction C2 of the casing cover 22. Each of the intermittently arranged seal retaining walls 32 constitutes a plurality of claw portions 35.

[0052] The multiple claw portions 35 of the casing cover 22 of this embodiment are arranged at equal intervals in the circumferential direction C2 of the casing cover 22. Similarly, the multiple protrusions 17 and recesses 16 of the outer casing 10 of this embodiment are arranged at equal intervals in the circumferential direction C2 of the casing cover 22. This improves the stability of the connection between the pump body 20 and the outer casing 10 compared to when the multiple claw portions 35 are arranged at uneven intervals in the circumferential direction C2 of the casing cover 22.

[0053] The pump according to the present disclosure is not limited to the specific configurations shown in the above-described embodiments, and various modifications, changes, and combinations are possible without departing from the scope of the claims.

[0054] For example, in the above-described embodiment, the seal support surface 30 of the casing cover 22 has an outer peripheral surface with a circular outer shape when viewed from the insertion / removal direction A. However, this is not limited thereto, and the seal support surface 30 of the casing cover 22 may have an elliptical or polygonal outer shape when viewed from the insertion / removal direction A. In this case, the outer casing 10 and the seal member 24 may have a shape corresponding to the seal support surface 30 of the casing cover 22. In this case, the pump 1 may be configured so that the pump main body 20 is connected to the external casing 10 without being rotated. Specifically, for example, the pump main body 20 may be inserted into the external casing 10, and then fixed to the external casing 10 with fastening members such as bolts.

[0055] In the above-described embodiment, the first support surface 30a and the second support surface 30b of the casing cover 22 extend parallel or substantially parallel to the insertion / removal direction A. However, the first support surface 30a and the second support surface 30b may extend at an angle to the insertion / removal direction A. However, by making the first support surface 30a and the second support surface 30b extend parallel or substantially parallel to the insertion / removal direction A as in the above-described embodiment, the seal member 24 can be uniformly compressed by the first support surface 30a and the second support surface 30b, respectively. This reduces variations in the sealing performance of the seal member 24 when the seal member 24 is supported by the first support surface 30a and the second support surface 30b, respectively. Therefore, it is easier to ensure the desired sealing performance of the seal member 24 when the seal member 24 is supported by the first support surface 30a and the second support surface 30b, respectively.

[0056] In the above-described embodiment, the pump 1 is a so-called back-pullout type pump. However, the pump 1 according to the present disclosure is not limited to a back-pullout type pump. However, using a back-pullout type pump having the configuration of the above-described embodiment as the pump 1 is preferable because it can further improve maintainability. [Industrial Applicability]

[0057] The present disclosure relates to pumps. [Explanation of symbols]

[0058] 1: Pump 10: Outer casing 11: Containment space 11a: Intake port 11b: Discharge port 11c: Mounting port 12: Suction flange 13: Discharge flange 14: Legs 15: Seal contact surface 16: Recess 17: Convex 18: Annular groove 20: Pump body 21: Motor 21a: Motor body 21b: Motor shaft 22: Casing cover 23: Sealing mechanism 24: Sealing material 24a: O-ring 25: Pressure section 30: Seal support surface 30a: 1st support surface 30b: 2nd support surface 30c: Inclined surface 32: Seal retaining wall 35: Claw part 41: Impeller 42: Inner casing 42a: Partial casing 43: Liner Ring A: Insertion / removal direction A1: Insertion direction A2: Removal direction B: Orthogonal direction C1: Circumferential direction of the motor shaft C2: Circumferential direction of the casing cover D1: Radial direction of the motor shaft D2: Radial direction of the casing cover L1: Distance between the seal contact surface and the first support surface in the perpendicular direction L2: Distance between the seal contact surface and the second support surface in the perpendicular direction O1: Central axis of the motor shaft O2: Central axis of the casing cover α: Inclination angle

Claims

1. an outer casing that defines an accommodation space and has an attachment port that opens to the outside; a pump main body that is inserted into the accommodation space through the mounting port and is capable of pressurizing the liquid accommodated in the accommodation space, The pump body includes: a casing cover capable of closing the mounting opening; a seal member that is supported by the casing cover and is sandwiched between the outer casing and the casing cover to seal the gap between the outer casing and the casing cover, an outer surface of the casing cover having a seal support surface that supports the seal member; an inner surface of the outer casing having a seal contact surface with which the seal member supported on the seal support surface comes into contact; the seal support surface includes a first support surface and a second support surface positioned in a removal direction of the insertion / removal direction of the pump body relative to the first support surface, the seal member is pressed in the removal direction by liquid pressurized by the pump body in the accommodation space, and is movable from a position supported by the first support surface to a position supported by the second support surface, A pump, wherein a compression allowance of the seal member when supported by the second support surface is greater than the compression allowance of the seal member when supported by the first support surface.

2. the first support surface and the second support surface extend parallel or substantially parallel to the insertion / removal direction, The pump according to claim 1 , wherein a distance between the second support surface and the seal contact surface in a direction perpendicular to the insertion / removal direction is smaller than a distance between the first support surface and the seal contact surface in the direction perpendicular to the insertion / removal direction.

3. 3. The pump according to claim 2, wherein the gap between the second support surface and the seal contact surface is 0.1 to 0.3 mm smaller than the gap between the first support surface and the seal contact surface.

4. The pump according to claim 2 or 3, wherein the seal support surface comprises an inclined surface connecting the first support surface and the second support surface.

5. 5. The pump according to claim 4, wherein the inclined surface has an inclination angle of 30 to 60 degrees with respect to the insertion / removal direction.

6. the casing cover defines a central axis along the insertion / removal direction and includes a claw portion that is convex radially outward from the central axis, The pump of any one of claims 1 to 3, wherein the outer casing comprises a recess through which the claw portion can pass, and a protrusion whose circumferential position is aligned with that of the claw portion when the pump main body is rotated circumferentially around the central axis with the claw portion passing through the recess.

7. The claw portions are arranged at different positions in the circumferential direction, The pump according to claim 6 , wherein a plurality of the protrusions are arranged at positions corresponding to the plurality of claws in the circumferential direction.

8. The pump according to claim 7 , wherein the plurality of claws are spaced apart at equal intervals in the circumferential direction.

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