Refrigerant pump

Abstract

The utility model discloses a refrigerant pump, a shell is provided with a limiting mechanism, 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 limiting mechanism comprises a driving rod, a pushing ring and a pushing block, the driving rod penetrates through the shell, the lower end of the driving rod is rotationally connected with the pushing block, and the lower side of the pushing block pushes the pushing ring to slide. 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 refrigerant pump, the overall structural design is reasonable, through the structural design of the pushing ring, radial force generated in the pushing action process of the pushing block can be completely counteracted, and therefore only axial component force is left in the process that the pushing block pushes the pushing ring, and the refrigerant pump is simple in structure and convenient to achieve.

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 refrigerant pump. Background Art

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

[0003] are as follows:

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

[0005] For another example, the 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 another example, the refrigerant pump can also be used in a new 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 - layer 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 the Chinese invention patent, application number: 201810939192.0, patent name: A centrifugal refrigerant pump, 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 inconvenience in adjusting 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 refrigerant pump that can completely offset the radial force generated during the pushing process of the pushing block through the structural design of a pushing ring, and solve the defects of the prior art that require a separate structure or rely on the supporting effect of the motor stator.

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

[0011] A 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] 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 incoming flow direction of the refrigerant entering the housing, and the motor stator is located on the downstream side of the incoming flow direction;

[0014] In a preferred embodiment, the limiting mechanism includes: a driving rod, a pushing ring, and a pushing block. The driving rod passes through 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.

[0015] In a preferred embodiment, one side of the pushing ring is a vertical surface, the vertical surface abuts against the side surface of the motor stator, the other side of the pushing ring is an inclined surface, and one side of the pushing block close to the pushing ring is an inclined surface. The pushing block slides along the inclined surface of the pushing ring to push the pushing ring to push the motor stator.

[0016] In a preferred embodiment, the pushing block includes: a pushing portion and an extending portion. The extending portions are integrally formed on both sides of the pushing portion to form a crescent structure. The diameter of the upper arc of the pushing block is the same as the inner diameter of the housing;

[0017] In a preferred embodiment, one side of the pushing portion close to the pushing ring protrudes downward, the position where the pushing portion protrudes downward is an inclined surface, and the pushing portion abuts against the pushing ring.

[0018] In a preferred embodiment, a pushing groove is formed in the inclined surface of the pushing ring, the bottom of the pushing groove is a plane, and the inclined surface of the pushing portion is also a plane.

[0019] In a preferred embodiment, the protruding dimension of the protruding portion of the pushing portion is greater than the depth of the pushing groove.

[0020] In a preferred embodiment, the width of the protruding portion of the pushing portion is less than the width of the pushing groove.

[0021] 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.

[0022] In a preferred embodiment, a stepped cavity is formed on the upper side of the pushing portion. The opening size 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.

[0023] In a preferred embodiment, the pushing blocks are symmetrically arranged on both sides of the housing.

[0024] In a preferred embodiment, three pushing blocks are 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.

[0025] The refrigerant pump of the present utility model has the following beneficial effects:

[0026] For this 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. The limiting mechanism includes: a driving rod, a pushing ring and a pushing block. The driving rod passes through the housing, and the pushing block is rotatably connected to the lower end of the driving rod. The lower side of the pushing block slides to push the pushing ring.

[0027] 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.

[0028] For this refrigerant pump, the overall structural design is reasonable. Through the structural design of the pushing ring, the radial force generated during the process of the pushing block's pushing action can be completely offset, so that during the process of the pushing block pushing the pushing ring, only the axial component force remains, and the structure is simple and easy to implement. It avoids the defect 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 supporting effect of the motor stator is required, which affects the complexity of the entire product or increases the effect on the motor stator, affecting the use effect of the motor and seriously affecting the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a cross-sectional view of a refrigerant pump according to an embodiment of the present disclosure;

[0031] Figure 2Cross-sectional view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0032] Figure 3 Left view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0033] Figure 4 Right view of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0034] Figure 5 Left view of the push ring of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0035] Figure 6 Right view of the push block of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure;

[0036] Figure 7 Front view of the push block of the limiting mechanism of a refrigerant pump according to an embodiment of the present disclosure.

[0037]

Description of Main Component Symbols

[0038] 1. Housing; 2. Bearing; 3. Main shaft;

[0039] 4. Motor;

[0040] 41. Motor rotor; 42. Motor stator;

[0041] 5. Impeller;

[0042] 6. Limiting mechanism;

[0043] 61. Driving rod; 62. Push ring; 63. Push block;

[0044] 611. Threaded rod; 612. Threaded head; 613. Pushing head;

[0045] 621. Pushing groove;

[0046] 631. Pushing part; 632. Extension part. Detailed Embodiment

[0047] The 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.

[0048] 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.

[0049] Note that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates 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 the stated features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings 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 is not necessarily 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.

[0051] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "upper" etc. can be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "on top of" another device or structure will then be positioned "below" or "beneath" the other device or structure. 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 the corresponding explanations are made for the spatial relative descriptions used herein.

[0052] As Figures 1-7 shown, the 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.

[0053] 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.

[0054] As mentioned in 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 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.

[0055] To solve the problem that during the abutting process against the motor stator 42, a balanced 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 with a pushing effect, a pushing ring 62 with a balanced supporting effect for abutting against the motor stator, and a pushing block 63 with a pushing and supporting effect on 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 on and pushes the pushing ring 62.

[0056] Through the annular pushing ring 62, it can be ensured that during the pushing process of the pushing block 63 along 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.

[0057] 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 can avoid the defect that the uneven force on the bearing 2 affects the service life of the bearing 2.

[0058] 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.

[0059] The pushing ring 62 is annular. 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 exerts a pushing effect on 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.

[0060] Furthermore, to make the interacting inclined surfaces be 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.

[0061] 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.

[0062] 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 prolonging the service life of the bearing and the motor.

[0063] Of course, to ensure that during the pushing process of the pushing portion 631, the extending portion 632 will not interfere. 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.

[0064] 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 is less than the width of the pushing groove 621.

[0065] In order to meet the driving effect of the driving rod 61, the driving rod 61 includes: a threaded rod 611 that rotates to achieve a telescopic effect, 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, so as to meet the position adjustment of the pushing ring 62.

[0066] In order to meet the cooperation with the pushing head 613, a stepped cavity is formed 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 as to meet the position limitation of the pushing block 63 by the pushing head 613, prevent the pushing block 63 from falling, and can also push the position of the pushing block 63.

[0067] In order to meet the symmetry of the motor stator 42, further improve the balanced force of the pushing ring 62, and thus ensure the balanced effect on the motor stator 42. The pushing blocks 63 are symmetrically arranged on both sides of the housing 1.

[0068] 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 meet the pushing effect.

[0069] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A refrigerant pump, characterized in that: include: 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) comprises: a motor rotor (41) matched with the main shaft (3) and a motor stator (42) matched with the housing (1); A limiting mechanism (6) is provided on the shell (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 shell (1), and the motor stator (42) is located on the downstream side of the flow direction; The limiting mechanism (6) comprises: a driving rod (61), a pushing ring (62) and a pushing block (63); the driving rod (61) passes through the housing (1); the pushing block (63) is rotatably connected to the lower end of the driving rod (61); the lower side of the pushing block (63) pushes the pushing ring (62) to slide.

2. The refrigerant pump according to claim 1, characterized in that: One side of the push ring (62) is a vertical surface, and the vertical surface is against the side of the motor stator (42). The other side of the push ring (62) is an inclined surface. The side of the push block (63) close to the push ring (62) is an inclined surface. The push block (63) slides along the inclined surface of the push ring (62) to push the push ring (62) to push the motor stator (42).

3. The refrigerant pump according to claim 2, characterized in that: The pushing block (63) comprises: a pushing portion (631) and an extending portion (632); the extending portion (632) is integrally formed by extending from both sides of the pushing portion (631) to form a crescent-shaped structure; the arc diameter of the upper side of the pushing block (63) is the same as the inner diameter of the housing (1); The pushing portion (631) protrudes downwards on one side close to the pushing ring (62); the downwardly protruding position of the pushing portion (631) is an inclined surface; the pushing portion (631) abuts against the pushing ring (62).

4. The refrigerant pump according to claim 3, characterized in that: The inclined surface of the pushing ring (62) is provided with a pushing groove (621), the bottom of the pushing groove (621) is a plane, and the inclined surface of the pushing portion (631) is also a plane.

5. The refrigerant pump according to claim 4, characterized in that: The extension dimension of the protruding portion of the pushing portion (631) is greater than the depth of the pushing groove (621).

6. The refrigerant pump according to claim 4, characterized in that: The width of the protruding portion of the pushing portion (631) is smaller than the width of the pushing groove (621).

7. The refrigerant pump according to any one of claims 3 to 6, characterized in that: The driving rod (61) comprises: 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); the lower end of the threaded rod (611) is fixedly connected to the pushing head (613); and the pushing head (613) and the pushing portion (631) are rotatably connected.

8. The refrigerant pump according to claim 7, characterized in that: A step cavity is provided on the upper side of the pushing portion (631), the opening size of the step cavity is the same as the outer diameter of the threaded rod (611), the inner diameter of the step cavity is the same as the diameter of the pushing head (613), and the diameter of the pushing head (613) is larger than the diameter of the threaded rod (611).

9. The refrigerant pump according to any one of claims 3 to 6, characterized in that: The pushing blocks (63) are symmetrically arranged on both sides of the housing (1).

10. The refrigerant pump according to claim 9, characterized in that: Three pushing blocks (63) are provided on one side of the shell (1), and the total length of the three pushing blocks (63) is less than 1 / 2 of the circumference of the inner circle of the shell.

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