Centrifugal refrigerant pump

Abstract

The utility model discloses a centrifugal refrigerant pump which is characterized in that a limiting mechanism is arranged on a shell, the limiting mechanism abuts against a motor stator, the limiting mechanism is located on the upstream side of the incoming flow direction of refrigerant entering the shell, and the motor stator is located on the downstream side of the incoming flow direction. The connecting plate is fixedly connected to the outer wall of the shell, a threaded hole is formed in the connecting plate in a penetrating mode, and the limiting mechanism penetrates through the threaded hole in a threaded connection mode and extends into the shell. The defects that in the prior art, in the process that the axial force generated by the front-back pressure difference of the impeller can be balanced through a limiting mechanism, the adjusting force is unbalanced, and the limiting force of the limiting mechanism is inconvenient to adjust are overcome. According to the centrifugal refrigerant pump, through the design of the connecting plate, fixing and threaded connection of the position of the limiting mechanism can be conveniently met, and it is guaranteed that the limiting mechanism is stressed and supported in the driving process. Threaded holes with high precision are prevented from being formed, the connecting plate and the limiting mechanism can be produced in a unified mode, the matching requirement is guaranteed, and the product precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pump structure design in the refrigeration industry, and particularly relates to a centrifugal refrigerant pump. Background Art

[0002] In the refrigeration field, the function of a centrifugal refrigerant pump is to pressurize the refrigerant in a liquid state. The application scenarios of centrifugal refrigerant pumps

[0003] are as follows:

[0004] For example, a centrifugal refrigerant pump can be used in scenarios where refrigerant needs to be transported over a relatively long distance in the refrigeration industry, which can save labor in links such as refrigerant handling on the production line and replacement of gas storage tanks.

[0005] For another example, a centrifugal refrigerant pump can be used in a traditional refrigerant pump - supplied liquid refrigeration system. For instance, in a marine refrigeration system, due to the hull sway and the limitation of the cabin floor space, the liquid supply of the marine refrigeration system generally adopts refrigerant pump - supplied liquid. First, the liquid refrigerant is transported to the cold - using area and then throttled and evaporated for refrigeration.

[0006] For still another example, a centrifugal refrigerant pump can also be used in a new type of natural condensate pump - supplied direct evaporation cooling system. The characteristics of the natural condensate pump - supplied direct evaporation cooling system are that it uses a low - temperature cold source (including low - temperature groundwater, deep reservoir water, river, lake, sea water, urban secondary sewage, and low - temperature air, etc.) to condense and liquefy the gaseous or gas - liquid two - phase refrigerant after absorbing the indoor waste heat in the air - conditioning area. The liquefied refrigerant is stored in a liquid storage device, and then it is transported to each indoor unit in the air - conditioning area through a liquid pump to absorb the indoor waste heat and vaporize to achieve cooling of the area.

[0007] In a Chinese invention patent, the application number is: 201810939192.0, and the patent name is: A centrifugal refrigerant pump, which avoids the failures and losses caused by the unbalanced axial force of the centrifugal refrigerant pump.

[0008] However, in this patent, during the process of balancing the axial force generated by the pressure difference before and after the impeller through the limiting mechanism, there are defects such as unbalanced adjustment force and inconvenient adjustment of the limiting force of the limiting mechanism. Utility Model Content

[0009] In view of this, the main purpose of the present utility model is to provide a centrifugal refrigerant pump that can conveniently satisfy the fixation of the position of the limiting mechanism and threaded connection, ensure the force support of the limiting mechanism during driving, meet the matching requirements, and improve the product precision.

[0010] To achieve the above - mentioned purpose, the technical solution of the present utility model is realized as follows:

[0011] A centrifugal refrigerant pump, comprising: a housing, a bearing located in the housing, a main shaft supported on the bearing, a motor mounted on the main shaft, and an impeller mounted at an end of the main shaft;

[0012] The motor includes: a motor rotor engaged with the main shaft and a motor stator engaged with the housing;

[0013] In a preferred embodiment, a limiting mechanism is provided on the housing, the limiting mechanism abuts against the motor stator, the limiting mechanism is located on the upstream side of the flow direction of the refrigerant entering the housing, and the motor stator is located on the downstream side of the flow direction;

[0014] In a preferred embodiment, it further includes: a connecting plate, the connecting plate is fixedly connected to the outer wall of the housing, a threaded hole is formed through the connecting plate, and the limiting mechanism is threadedly connected through the threaded hole and extends into the interior of the housing.

[0015] In a preferred embodiment, a polygonal groove is formed on the outer wall of the housing, the edge of the connecting plate has the same structure as the polygonal groove, and the connecting plate is embedded in the polygonal groove.

[0016] In a preferred embodiment, the connecting plate is of a hexagonal structure;

[0017] In a preferred embodiment, an angular reference scale is engraved around the center of the upper surface of the connecting plate;

[0018] In a preferred embodiment, a scale indicating arrow is engraved or painted on the upper end of the limiting mechanism.

[0019] In a preferred embodiment, it further includes: a connecting arm, the connecting arm is in a Z-shaped bent shape, the upper bent section of the connecting arm presses and connects to the upper surface of the connecting plate, and the lower section of the connecting arm is fixedly connected to the outer wall of the housing by screws.

[0020] In a preferred embodiment, a limiting groove is formed on the upper surface of the edge of the connecting plate, and the upper end of the connecting arm is embedded in the limiting groove;

[0021] In a preferred embodiment, the connecting arm is arranged at the middle position of one side of the polygonal groove.

[0022] In a preferred embodiment, the limiting mechanism includes: a driving rod, a pushing ring and a pushing block, the driving rod passes through the connecting plate and the housing, the pushing block is rotatably connected to the lower end of the driving rod, and the lower side of the pushing block slides to push the pushing ring;

[0023] In a preferred embodiment, an external thread is provided on the outer wall of the driving rod, and the external thread is in threaded engagement with the threaded hole.

[0024] In a preferred embodiment, one side of the pushing ring is a vertical surface that abuts against the side surface of the motor stator, and the other side of the pushing ring is an inclined surface. One side of the pushing block close to the pushing ring is an inclined surface, and the pushing block slides along the inclined surface of the pushing ring to push the pushing ring to push the motor stator.

[0025] In a preferred embodiment, the pushing block includes a pushing portion and an extending portion. The extending portions are integrally formed by extending both sides of the pushing portion to form a crescent-shaped structure. The diameter of the upper arc of the pushing block is the same as the inner diameter of the housing.

[0026] In a preferred embodiment, one side of the pushing portion close to the pushing ring protrudes downward, and the position where the pushing portion protrudes downward is an inclined surface, and the pushing portion abuts against the pushing ring.

[0027] In a preferred embodiment, a pushing groove is provided on the inclined surface of the pushing ring, the bottom of the pushing groove is a flat surface, and the inclined surface of the pushing portion is also a flat surface.

[0028] In a preferred embodiment, the protruding dimension of the protruding portion of the pushing portion is greater than the depth of the pushing groove.

[0029] In a preferred embodiment, the width of the protruding portion of the pushing portion is less than the width of the pushing groove.

[0030] In a preferred embodiment, the driving rod includes a threaded rod, a threaded head, and a pushing head. The upper end of the threaded rod is fixedly connected to the threaded head, the lower end of the threaded rod is fixedly connected to the pushing head, and the pushing head is rotatably connected to the pushing portion.

[0031] In a preferred embodiment, a stepped cavity is provided on the upper side of the pushing portion. The opening dimension of the stepped cavity is the same as the outer diameter of the threaded rod, the inner diameter of the stepped cavity is the same as the diameter of the pushing head, and the diameter of the pushing head is greater than the diameter of the threaded rod.

[0032] In a preferred embodiment, the pushing blocks are symmetrically arranged on both sides of the housing.

[0033] In a preferred embodiment, there are three pushing blocks provided on one side of the housing, and the total length of the three pushing blocks is less than 1 / 2 of the inner circumference of the housing.

[0034] The centrifugal refrigerant pump of the present utility model has the following beneficial effects:

[0035] For this centrifugal refrigerant pump, a limiting mechanism is provided on the housing. The limiting mechanism abuts against the motor stator. The limiting mechanism is located on the upstream side of the flow direction of the refrigerant entering the housing, and the motor stator is located on the downstream side of the flow direction. A connecting plate is fixedly connected to the outer wall of the housing, and a threaded hole is formed through the connecting plate. The limiting mechanism is threadedly connected through the threaded hole and extends into the interior of the housing.

[0036] It solves the defect in the prior art that during the process of balancing the axial force generated by the pressure difference between the front and rear of the impeller through the limiting mechanism, there is an imbalance in the adjustment force and it is inconvenient to adjust the limiting force of the limiting mechanism.

[0037] For this centrifugal refrigerant pump, through the design of the connecting plate, it can conveniently meet the fixation and threaded connection of the position of the limiting mechanism, ensuring the force support of the limiting mechanism during driving. It avoids the defect of complex processing procedures due to the need to machine threaded holes with high precision. Moreover, by unified production of the connecting plate and the limiting mechanism, the matching requirements can be ensured and the product precision can be improved. Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a cross-sectional view of a centrifugal refrigerant pump according to an embodiment of the present disclosure;

[0040] Figure 2 It is Figure 1 A partial enlarged view of part A of a centrifugal refrigerant pump according to an embodiment of the present disclosure;

[0041] Figure 3 It is a top view of the connecting plate of a centrifugal refrigerant pump according to an embodiment of the present disclosure;

[0042] Figure 4 It is a cross-sectional view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0043] Figure 5 It is a left view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0044] Figure 6 It is a right view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0045] Figure 7Left view of the pushing ring of the limiting mechanism of the refrigerant pump according to an embodiment of the present disclosure;

[0046] Figure 8 Right view of the pushing block of the limiting mechanism of the refrigerant pump according to an embodiment of the present disclosure;

[0047] Figure 9 Front view of the pushing block of the limiting mechanism of the refrigerant pump according to an embodiment of the present disclosure.

[0048]

Description of Main Component Symbols

[0049] 1. Housing; 2. Bearing; 3. Main shaft;

[0050] 11. Polygonal groove;

[0051] 4. Motor;

[0052] 41. Motor rotor; 42. Motor stator;

[0053] 5. Impeller;

[0054] 6. Limiting mechanism;

[0055] 61. Driving rod; 62. Pushing ring; 63. Pushing block;

[0056] 611. Threaded rod; 612. Threaded head; 613. Pushing head;

[0057] 621. Pushing groove;

[0058] 631. Pushing part; 632. Extension part;

[0059] 7. Connecting plate;

[0060] 71. Angle reference scale; 72. Scale indicating arrow;

[0061] 8. Connecting arm. Detailed Embodiment

[0062] The centrifugal refrigerant pump of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments of the present invention.

[0063] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0066] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above" etc. can be used herein to describe the spatial positional relationship of a device or feature shown in the figure with 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 of the device. For example, if the device in the figure is inverted, the device described as "above" or "on top of" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used herein.

[0067] As Figures 1-9 shown, the centrifugal refrigerant pump includes: a housing 1, a bearing 2 located in the housing 1, a main shaft 3 supported on the bearing 2, a motor 4 mounted on the main shaft 3, and an impeller 5 mounted at the end of the main shaft 3.

[0068] The motor 4 includes: a motor rotor 41 that mates with the main shaft 3 and a motor stator 42 that mates with the housing 1.

[0069] As mentioned in the comparative document 201810939192.0, a limiting mechanism 6 is provided on the housing 1. The limiting mechanism 6 abuts against the motor stator 42. The limiting mechanism 6 is located on the upstream side of the flow direction of the refrigerant entering the housing 1, and the motor stator 42 is located on the downstream side of the flow direction. In order to cooperate with the expansion and contraction of the limiting mechanism 6, especially to meet the requirement that the limiting mechanism 6 expands and contracts along the housing 1, the defect of opening threaded holes on the housing 1 and affecting the overall structure of the housing is avoided.

[0070] It further includes: a connecting plate 7 for the threaded connection function of the limiting mechanism 6. The connecting plate 7 is fixedly connected to the outer wall of the housing 1. A threaded hole is drilled through the connecting plate 7, and the limiting mechanism 6 is threadedly connected through the threaded hole and extends into the interior of the housing 1.

[0071] By separately manufacturing the connecting plate 7, threaded holes can be conveniently drilled in the connecting plate 7 to meet the cooperation function with the limiting structure, ensure that the limiting structure 6 expands and contracts along the housing, and thus meet the abutting function of the limiting structure 6 against the motor stator 42.

[0072] Separately manufacturing the connecting plate 7 is convenient for production and can ensure precision, and there will be no influence between the mutual processes. Especially, the defect of difficult drilling of threaded holes in the housing 1 due to the relatively large structure of the housing 1 is avoided.

[0073] In order to conveniently limit the connecting plate 7 through the housing 1 and ensure that the connecting plate 7 does not rotate during use, so as to ensure the rotation of the limiting mechanism 6 and thus meet the adjustment of the limiting mechanism 6. A polygonal groove 11 is opened on the outer wall of the housing 1. The edge of the connecting plate 7 has the same structure as the polygonal groove 11, and the connecting plate 7 is embedded in the polygonal groove 11. Embedding and connecting the connecting plate 7 has a simple connection method and can conveniently meet the limiting function of the connecting plate 7.

[0074] Preferably, the connecting plate 7 is of a hexagonal structure;

[0075] In order to conveniently meet the requirement of the debugger to adjust the expansion and contraction dimension of the limiting mechanism 6, improve the adjustment precision to meet the balanced abutting function against the motor stator 42, and thus improve the limiting effect of the limiting mechanism 6. Angle reference scales 71 are engraved on the upper surface of the connecting plate 7 around the center of the connecting plate 7;

[0076] A scale indicating arrow 72 is engraved or coated on the upper end of the limiting mechanism 6. By showing the position of the scale indicating arrow 72 relative to the angle reference scale 71, the adjustment depth of the limiting mechanism 6 can be conveniently observed, thus improving the adjustment precision.

[0077] To fix the connecting plate 7 and prevent it from detaching from the housing 1. It further includes: a connecting arm 8 that presses the connecting plate 7 against the outer wall of the housing 1. The connecting arm 8 is in a Z-shaped bent form. The upper bent section of the connecting arm 8 presses and connects to the upper surface of the connecting plate 7, and the lower section of the connecting arm 8 is fixedly connected to the outer wall of the housing 1 by screws. Through the Z-shaped bent structure design, the two sections of the connecting arm 8 can respectively fit the upper surface of the connecting plate 7 and the outer wall of the housing 1.

[0078] To cooperate with the connecting arm 8 and ensure the connection effect on the connecting plate 7. A limiting groove is provided on the upper surface of the edge of the connecting plate 7, and the upper end of the connecting arm 8 is embedded in the limiting groove;

[0079] To increase the depth of the connecting arm 8 extending into the connecting plate 7 and improve the pressing degree. The connecting arm 8 is arranged at the middle position of one side of a polygonal groove.

[0080] To solve the problem that during the process of abutting against the motor stator 42, a balancing effect can be achieved to avoid the uneven force on the motor stator 42 affecting the working effect of the motor 4. The limiting mechanism 6 includes: a driving rod 61 for pushing, a pushing ring 62 for abutting and balancing the support of the motor stator, and a pushing block 63 for pushing and supporting the pushing ring 62. The driving rod 61 passes through the housing 1, and the pushing block 63 is rotatably connected to the lower end of the driving rod 61. The lower side of the pushing block 63 slides against the pushing ring 62. Through the annular pushing ring 62, it can be ensured that during the process of the pushing block 63 pushing in the diameter direction, the radial acting force is offset, and only the component force in the axial direction remains. Thus, the abutting effect on the motor stator 42 can be achieved by abutting against the pushing ring 62.

[0081] Furthermore, the entire pushing ring 62 is a circular ring, which can act on the motor stator in a balanced manner, increase the acting area, ensure a stable action on the motor stator during the abutting process, and further reduce the defect that the offset affects the use effect of the motor. Similarly, it avoids the defect that the uneven force on the bearing 2 affects the service life of the bearing 2.

[0082] To cooperate with the connecting plate 7 and ensure the telescopic movement of the driving rod 61, an external thread is provided on the outer wall of the driving rod 61, and the external thread is in threaded fit with the threaded hole.

[0083] To adapt to the abutting surface of the motor stator 42, one side of the pushing ring 62 is a vertical surface, and the vertical surface abuts against the side surface of the motor stator 42. The vertical surface of the pushing ring 62 completely fits the side surface of the motor stator 42. On the other side of the pushing ring 62 is an inclined surface, and the side of the pushing block 63 close to the pushing ring 62 is an inclined surface. The pushing block 63 slides along the inclined surface of the pushing ring 62 to push the pushing ring 62 to push the motor stator 42. Through the sliding of the two opposite inclined surfaces, the effect of the pushing ring 62 abutting against the motor stator 42 is achieved during the process of the pushing block 63 pushing towards the center of the housing.

[0084] The pushing ring 62 is circular. To ensure that the inclined surface is a planar structure, so as to satisfy that the pushing block 62 can have surface contact during the pushing process, and prevent the situation that during the pushing process, due to the arc surface, the inclined surfaces interact with each other as point contact or line contact during the sliding of the inclined surface. The pushing block 63 includes: a pushing portion 631 that mainly pushes the pushing ring 62 and an extending portion 632 that extends a certain length of the arc. The extending portions 632 are integrally formed on both sides of the pushing portion 631 to form a crescent structure. To maximize the pushing stroke of the pushing block 63 and avoid interference with the inner wall of the arc-shaped housing, the diameter of the upper arc of the pushing block 63 is the same as the inner diameter of the housing 1; the pushing block 63 fits against the inner wall of the housing 1 and can be in the position closest to the housing 1.

[0085] Furthermore, to make the interacting inclined surfaces planar and avoid the defect that the force application points are line contact or point contact during the interaction of two arc surfaces. The side of the pushing portion 631 close to the pushing ring 62 protrudes downward, and the downward protruding position of the pushing portion 631 is an inclined surface. The pushing portion 631 abuts against the pushing ring 62. The downward protruding position of the pushing portion 631 is an inclined surface, and the inclined surface is a planar structure. The planar structure can ensure that during the process of the pushing portion 631 acting on the pushing ring 62, it is always in surface contact, improving the stability of the abutting effect.

[0086] Of course, to match the planar inclined surface structure of the pushing portion 631 and ensure that it is also a planar action on the pushing ring 62. A pushing groove 621 is provided on the inclined surface of the pushing ring 62, the bottom of the pushing groove 621 is planar, and the inclined surface of the pushing portion 631 is also planar.

[0087] The pushing portion 631 extends into the pushing groove 621 to act. The two planar surfaces are in contact, and during the sliding process of the pushing portion 631, the pushing portion 631 and the bottom of the pushing groove 621 are in planar contact. During the adjustment process, they are all in surface contact support, improving the stability and balance of the action, ensuring the balanced support of the motor stator 42, and extending the service life of the bearing and the motor.

[0088] Of course, to ensure that the extending portion 632 does not interfere during the pushing process of the pushing portion 631, the extending portion 632 only plays a role of balanced support. For example, it can act when a large inclination occurs to avoid serious damage, playing a preventive protection role. The protruding dimension of the protruding portion of the pushing portion 631 is greater than the depth of the pushing groove 621.

[0089] To ensure that the pushing portion 631 can smoothly extend into the pushing groove 621, the width of the protruding portion of the pushing portion 631 that protrudes is less than the width of the pushing groove 621.

[0090] To satisfy the driving function of the driving rod 61, the driving rod 61 includes: a threaded rod 611 that rotates to achieve telescopic action, a threaded head 612 that is rotated by a wrench, and a pushing head 613 that rotates relative to the pushing block 63 and pushes the pushing block 63 to slide. The upper end of the threaded rod 611 is fixedly connected to the threaded head 612, the lower end of the threaded rod 611 is fixedly connected to the pushing head 613, and the pushing head 613 is rotatably connected to the pushing portion 631. Thus, while ensuring the sealed state of the housing 1, the driving rod 61 can drive the sliding of the pushing portion 631, thereby satisfying the position adjustment of the pushing ring 62.

[0091] To satisfy the cooperation with the pushing head 613, a stepped cavity is provided on the upper side of the pushing portion 631. The opening size of the stepped cavity is the same as the outer diameter of the threaded rod 611, the inner diameter of the stepped cavity is the same as the diameter of the pushing head 613, and the diameter of the pushing head 613 is greater than the diameter of the threaded rod 611. The pushing head 613 is limited by the stepped cavity, so that the position of the pushing block 63 can be limited by the pushing head 613 to prevent the pushing block 63 from falling, and the position of the pushing block 63 can also be pushed.

[0092] To satisfy the symmetry of the motor stator 42, further improve the balanced force of the pushing ring 62, and further ensure the balanced action on the motor stator 42. The pushing blocks 63 are symmetrically arranged on both sides of the housing 1.

[0093] In a preferred embodiment, three pushing blocks 63 are provided on one side of the housing 1, and the total length of the three pushing blocks 63 is less than 1 / 2 of the inner circumference of the housing. Sufficient gaps are left between adjacent pushing blocks 63 to satisfy the pushing function.

[0094] The centrifugal refrigerant pump has a reasonable overall structural design. Through the structural design of the pushing ring, the radial force generated during the pushing process of the pushing block can be completely offset, so that only the axial component force remains during the process of the pushing block pushing the pushing ring. The structure is simple and easy to implement. It avoids the defects in the prior art that during the process of abutting against the motor stator, the radial force cannot be eliminated, and a separate structure or the support of the motor stator is required, which affects the complexity of the entire product or increases the action on the motor stator, affecting the use effect of the motor and seriously affecting the service life of the motor.

[0095] The above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention.

Claims

1. A centrifugal refrigerant pump, characterized in that, Comprising: A housing (1), a bearing (2) located in the housing (1), a main shaft (3) supported on the bearing (2), a motor (4) mounted on the main shaft (3), and an impeller (5) mounted at the end of the main shaft (3); The motor (4) includes: a motor rotor (41) cooperating with the main shaft (3) and a motor stator (42) cooperating with the housing (1); A limiting mechanism (6) is provided on the housing (1), the limiting mechanism (6) abuts against the motor stator (42), the limiting mechanism (6) is located on the upstream side of the incoming flow direction of the refrigerant entering the housing (1), and the motor stator (42) is located on the downstream side of the incoming flow direction; It further includes: a connecting plate (7), the connecting plate (7) is fixedly connected to the outer wall of the housing (1), a threaded hole is formed through the connecting plate (7), and the limiting mechanism (6) is threadedly connected through the threaded hole and extends into the interior of the housing (1).

2. The centrifugal refrigerant pump according to claim 1, wherein A polygonal groove (11) is formed on the outer wall of the housing (1), the edge of the connecting plate (7) has the same structure as the polygonal groove (11), and the connecting plate (7) is embedded in the polygonal groove (11).

3. The centrifugal refrigerant pump according to claim 2, wherein The connecting plate (7) is of a hexagonal structure; An angle reference scale (71) is engraved around the center of the upper surface of the connecting plate (7); A scale indicating arrow (72) is engraved or coated on the upper end of the limiting mechanism (6).

4. The centrifugal refrigerant pump according to claim 3, wherein It further includes: A connecting arm (8), the connecting arm (8) is in a Z-shaped bent shape, the upper bent section of the connecting arm (8) is pressed and connected to the upper surface of the connecting plate (7), and the lower section of the connecting arm (8) is fixedly connected to the outer wall of the housing (1) by screws.

5. The centrifugal refrigerant pump according to claim 4, characterized in that, A limiting groove is formed on the upper surface of the edge of the connecting plate (7), and the upper end of the connecting arm (8) is embedded in the limiting groove; The connecting arm (8) is arranged at the middle position of one side of the polygonal groove.

6. The centrifugal refrigerant pump according to any one of claims 1-5, characterized in that, The limiting mechanism (6) includes: a driving rod (61), a pushing ring (62), and a pushing block (63), the driving rod (61) passes through the connecting plate and the housing (1), the pushing block (63) is rotatably connected to the lower end of the driving rod (61), and the lower side of the pushing block (63) slides and pushes the pushing ring (62); External threads are formed on the outer wall of the driving rod (61), and the external threads are in threaded cooperation with the threaded hole.

7. The centrifugal refrigerant pump according to claim 6, characterized in that, One side of the pushing ring (62) is a vertical surface, the vertical surface abuts against the side surface of the motor stator (42), the other side of the pushing ring (62) is an inclined surface, one side of the pushing block (63) close to the pushing ring (62) is an inclined surface, and the pushing block (63) slides along the inclined surface of the pushing ring (62) to push the pushing ring (62) to push the motor stator (42).

8. The centrifugal refrigerant pump according to claim 7, wherein, The pushing block (63) includes: a pushing portion (631) and an extending portion (632), the extending portions (632) are integrally formed by extending both sides of the pushing portion (631) to form a crescent structure, and the diameter of the upper arc of the pushing portion (631) is the same as the inner diameter of the housing (1); One side of the pushing part (631) close to the pushing ring (62) protrudes downward, and the downward protruding position of the pushing part (631) is an inclined surface. The pushing part (631) abuts against the pushing ring (62). A pushing groove (621) is formed in the inclined surface of the pushing ring (62). The bottom of the pushing groove (621) is a flat surface, and the inclined surface of the pushing part (631) is also a flat surface. The protruding dimension of the protruding part of the pushing part (631) is greater than the depth of the pushing groove (621). The width of the protruding part of the pushing part (631) is smaller than the width of the pushing groove (621).

9. The centrifugal refrigerant pump according to claim 8, wherein The driving rod (61) includes a threaded rod (611), a threaded head (612) and a pushing head (613). The upper end of the threaded rod (611) is fixedly connected to the threaded head (612), and the lower end of the threaded rod (611) is fixedly connected to the pushing head (613). The pushing head (613) is rotatably connected to the pushing part (631). A stepped cavity is formed on the upper side of the pushing part (631). The opening dimension of the stepped cavity is the same as the outer diameter of the threaded rod (611). The inner diameter of the stepped cavity is the same as the diameter of the pushing head (613). The diameter of the pushing head (613) is greater than the diameter of the threaded rod (611).

10. The centrifugal refrigerant pump according to claim 8, characterized in that, The pushing blocks (63) are symmetrically arranged on both sides of the housing (1). There are three pushing blocks (63) arranged on one side of the housing (1), and the total length of the three pushing blocks (63) is less than 1 / 2 of the inner circumference of the housing.

Images