CN220415705U - Liquid discharge device and refrigeration system - Google Patents

Abstract

The application discloses liquid discharging device and refrigerating system, liquid discharging device includes: the pump comprises a pump shell, wherein the pump shell is provided with a pump cavity, the pump cavity comprises a first cavity and a second cavity which are distributed along a first direction, one end of the first cavity, which is far away from the second cavity, is provided with a liquid inlet, and one side of the second cavity, which is in a second direction, is provided with a liquid outlet; the impeller is rotatably arranged in the pump cavity around an axis extending in the first direction, the impeller comprises a first functional section and a second functional section which are distributed in the first direction, the first functional section is positioned in the first cavity, the second functional section is positioned in the second cavity, and the size between the outer peripheral surface of the first functional section and the inner wall surface of the first cavity is gradually increased from the liquid inlet to the second cavity. The liquid discharge device has high liquid discharge capacity, can meet the requirements of customers in different flow intervals, and has low manufacturing cost and energy consumption and strong practicability.

Description

Liquid discharge device and refrigeration system

Technical Field

The application belongs to the technical field of fluid control, and particularly relates to a liquid discharge device and a refrigeration system.

Background

During the operation of the refrigerating system, a great amount of condensed water is generated on the surface of the heat exchanger due to the cooling effect of the heat exchanger on the ambient air during the operation (refrigeration and dehumidification) of the air conditioner, and the condensed water drops into the condensed water receiving tray below the heat exchanger when the condensed water is gathered to a certain degree, so that a liquid discharge device is required to be arranged in the water receiving tray to discharge the condensed water in the water receiving tray outdoors.

When the refrigerating system operates at low power for refrigeration, the condensate water is less in quantity, and the existing low-power liquid discharge device can meet the use requirement; when refrigeration equipment operates at high power for refrigeration, the quantity of condensate water production is great, and the current low-power liquid discharge device flowing back ability is poor, can not satisfy the user demand, if adopt high-power liquid discharge device to supply refrigerating system to use, can satisfy refrigerating system's user demand, but can have the energy consumption height when high-power liquid discharge device, problem with high costs.

Disclosure of Invention

The first object of the present application is to provide a new solution for a liquid discharge device, which at least can solve the technical problem of poor liquid discharge capability of the existing low-power liquid discharge device.

A second object of the present application is to provide a refrigeration system comprising the above liquid discharge device.

According to a first aspect of the present application, there is provided a liquid discharge apparatus comprising: the pump comprises a pump shell, wherein the pump shell is provided with a pump cavity, the pump cavity comprises a first cavity and a second cavity which are distributed along a first direction, one end of the first cavity, which is far away from the second cavity, is provided with a liquid inlet, and one side of the second cavity, which is in a second direction, is provided with a liquid outlet; the impeller is rotatably arranged in the pump cavity around an axis extending in the first direction, the impeller comprises a first functional section and a second functional section which are distributed in the first direction, the first functional section is positioned in the first cavity, the second functional section is positioned in the second cavity, and the size between the outer peripheral surface of the first functional section and the inner wall surface of the first cavity is gradually increased from the liquid inlet to the second cavity.

According to one embodiment of the present application, the pump chamber further comprises: the transition chamber is arranged between the first chamber and the second chamber, and the radial dimension of the transition chamber is gradually increased from the first chamber to the second chamber; the inner wall surface of the transition chamber is formed into a first arc-shaped transition surface, and the first arc-shaped transition surface is tangent to the inner wall surface of the first chamber and the inner wall surface of the second chamber respectively.

According to one embodiment of the present application, the impeller further comprises: the transition section is arranged between the first functional section and the second functional section, and the radial dimension of the transition section is gradually increased from the first functional section to the second functional section; the outer peripheral surface of the transition section is formed into a second arc-shaped transition surface which is tangent to the outer peripheral surface of the first functional section and the outer peripheral surface of the second functional section respectively.

According to one embodiment of the present application, the dimension between the first arcuate transition surface and the second arcuate transition surface tapers from the first chamber to the second chamber.

According to one embodiment of the present application, the second arcuate transition surface has a greater arc than the first arcuate transition surface.

According to one embodiment of the present application, the radial dimension of the first functional section is 0.5 to 0.6 times the radial dimension of the liquid inlet, and the radial dimension of the liquid outlet is greater than the dimension of the second functional section in the first direction.

According to one embodiment of the present application, in the first direction, the second functional section is located between inner wall surfaces of the liquid outlet in the first direction.

According to one embodiment of the present application, in the first direction, a dimension between a side of the outer periphery of the second functional section, which is close to the first functional section, and the inner wall surface of the liquid outlet is d1, and a dimension between a side of the outer periphery of the second functional section, which is far away from the first functional section, and the inner wall surface of the liquid outlet is d2, d1 > d2.

According to an embodiment of the present application, the liquid discharge apparatus further includes: the motor is arranged on the pump shell and is in transmission connection with the impeller so as to drive the impeller to rotate; the electric control board is electrically connected with the motor, and is arranged outside the pump shell, or is integrated in an external electric control assembly.

According to a second aspect of the present application, there is provided a refrigeration system comprising a liquid discharge apparatus according to any one of the embodiments described above.

According to the liquid discharge device, through the size between the outer peripheral face of the first functional section and the inner wall face of the first chamber gradually increases from the liquid inlet to the second chamber, the water containing space between the first functional section and the inner wall face of the first chamber can be increased, more liquid can enter the pump cavity, meanwhile, the increased water containing space can play a good internal depressurization role, liquid can enter the pump cavity from the liquid inlet rapidly, the liquid discharging capacity of the liquid discharge device can be effectively improved, that is, the structure of the liquid discharge device can be effectively improved under the condition that the driving force to the impeller is not changed, the liquid discharging capacity can meet the requirements of different flow intervals of customers, the manufacturing cost and the energy consumption are low, and the liquid discharge device is high in practicability.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

fig. 1 is a schematic view of an internal structure of a liquid discharge apparatus according to an embodiment of the present application;

FIG. 2 is a top view of a portion of the structure of a pump housing of a liquid discharge apparatus according to an embodiment of the present application;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a top view of an impeller of a liquid discharge apparatus according to an embodiment of the present application;

fig. 5 is a cross-sectional view taken along line B-B of fig. 4.

Reference numerals:

a liquid discharge device 100;

a pump housing 10; a pump chamber 11;

a first chamber 111; a liquid inlet 111a;

a second chamber 112; a liquid outlet 112a;

a transition chamber 113; a first arcuate transition surface 113a;

an impeller 20; a first functional section 21; a second functional segment 22; a transition section 23;

a second arcuate transition surface 23a;

a motor 30.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The liquid discharge apparatus 100 according to the embodiment of the present application is described in detail below with reference to the drawings.

As shown in fig. 1 to 5, a liquid discharge apparatus 100 according to an embodiment of the present application includes a pump casing 10 and an impeller 20.

Specifically, the pump housing 10 is provided with a pump chamber 11, the pump chamber 11 includes a first chamber 111 and a second chamber 112 distributed along a first direction, one end of the first chamber 111 away from the second chamber 112 is provided with a liquid inlet 111a, one side of the second chamber 112 along a second direction is provided with a liquid outlet 112a, the impeller 20 is rotatably arranged in the pump chamber 11 around an axis extending along the first direction, the impeller 20 includes a first functional section 21 and a second functional section 22 distributed along the first direction, the first functional section 21 is located in the first chamber 111, the second functional section 22 is located in the second chamber 112, and a dimension between an outer peripheral surface of the first functional section 21 and an inner wall surface of the first chamber 111 is gradually increased from the liquid inlet 111a to the second chamber 112.

In other words, as shown in fig. 1 to 5, the liquid discharge apparatus 100 according to the embodiment of the present application mainly includes a pump housing 10 and an impeller 20, a first direction may be an axial direction of the impeller 20, a second direction may be a radial direction of the impeller 20, a pump chamber 11 for mounting the impeller 20 is provided in the pump housing 10, the pump chamber 11 includes two parts distributed in the first direction, one part of the pump chamber 11 is a first chamber 111 having a relatively small radial dimension, the first chamber 111 may be formed in a horn structure, one end of the first chamber 111 having a larger radial dimension communicates with the second chamber 112, and the other part of the pump chamber 11 is a second chamber 112 having a relatively large radial dimension; the first chamber 111 is provided with a liquid inlet 111a communicating with the first chamber 111 at one end far away from the second chamber 112, and the second chamber 112 is provided with at least one liquid outlet 112a at one side in the second direction, and in this embodiment, the number of the liquid outlets 112a may be two or more, which may be determined according to actual requirements.

As shown in fig. 1, the impeller 20 is rotatably provided in the pump chamber 11 around its own axis, specifically, the impeller 20 includes a first functional section 21 and a second functional section 22 distributed in a first direction, the first functional section 21 is rotatably provided in the first chamber 111 around the axis of the impeller 20, and the size between the outer peripheral surface of the first functional section 21 and the inner wall surface of the first chamber 111 is gradually increased from the liquid inlet 111a to the second chamber 112 in the first direction to increase the space between the first functional section 21 and the inner wall surface of the first chamber 111, the second functional section 22 is fitted with the second chamber 112, and the second functional section 22 is rotatably provided in the second chamber 112 around the axis of the impeller 20.

As shown in fig. 1, when the liquid discharging device 100 is operated, liquid enters the first chamber 111 from the liquid inlet 111a, and the size between the outer peripheral surface of the first functional section 21 and the inner wall surface of the first chamber 111 gradually increases from the liquid inlet 111a to the second chamber 112 in the first direction, that is, the space of the first chamber 111 is increased relative to the first functional section 21 of the pump vane, so that the liquid has a larger space after entering the first chamber 111, a good internal depressurization effect is achieved, so that the liquid can quickly enter the pump chamber 11 from the liquid inlet 111a, and meanwhile, the water containing space between the first functional section 21 and the first chamber 111 is increased, so that more liquid enters the pump chamber 11, and the liquid discharging capability of the liquid discharging device 100 can be effectively improved.

Therefore, according to the liquid discharging device 100 of the embodiment of the application, the size between the outer peripheral surface of the first functional section 21 and the inner wall surface of the first chamber 111 is gradually increased from the liquid inlet 111a to the second chamber 112, so that the water containing space between the first functional section 21 and the inner wall surface of the first chamber 111 can be increased, more liquid can enter the pump chamber 11, meanwhile, the increased water containing space can play a good role in internal depressurization, so that the liquid can quickly enter the pump chamber 11 from the liquid inlet 111a, the liquid discharging capability of the liquid discharging device 100 can be effectively improved, that is, the structure of the liquid discharging device 100 of the application is used under the condition that the driving force to the impeller 20 is not changed, the liquid discharging capability can be effectively improved, the requirements of different flow intervals of clients can be met, the manufacturing cost and the energy consumption are low, and the practicability is strong.

According to one embodiment of the present application, the pump chamber 11 further comprises: the transition chamber 113, the transition chamber 113 locates between first chamber 111 and second chamber 112, the radial dimension of the transition chamber 113 is increased gradually from first chamber 111 to second chamber 112; the inner wall surface of the transition chamber 113 forms a first arcuate transition surface 113a, the first arcuate transition surface 113a being tangential to the inner wall surface of the first chamber 111 and the inner wall surface of the second chamber 112, respectively.

Specifically, as shown in fig. 1 and 3, a transition chamber 113 is disposed between the first chamber 111 and the second chamber 112, an inner wall surface of the transition chamber 113 is formed as a first arc-shaped transition surface 113a, a first end of the transition chamber 113 is communicated with the first chamber 111, a second end of the transition chamber 113 is communicated with the second chamber 112, and a radial dimension of the first end of the transition chamber 113 is the same as a radial dimension of an end of the first chamber 111, which is close to the second chamber 112, so that the first arc-shaped transition surface 113a is tangent to the inner wall surface of the first chamber 111, thereby facilitating smooth flow of liquid between the first chamber 111 and the transition chamber 113, reducing energy loss of the liquid, and improving liquid discharging capability of the liquid discharging device 100.

As shown in fig. 1 and 3, the radial dimension of the second end of the transition chamber 113 is the same as the radial dimension of the end of the second chamber 112 near the first chamber 111, so that the first arc-shaped transition surface 113a is tangential to the inner wall surface of the second chamber 112, so that the liquid can smoothly flow between the transition chamber 113 and the second chamber 112, the energy loss of the liquid is reduced, and the liquid discharging capability of the liquid discharging device 100 is improved.

In some embodiments of the present application, the impeller 20 further comprises: the transition section 23, the transition section 23 locates between first function section 21 and second function section 22, the radial dimension of the transition section 23 is increased gradually from first function section 21 to second function section 22; the outer peripheral surface of the transition section 23 is formed as a second arcuate transition surface 23a, and the second arcuate transition surface 23a is tangent to the outer peripheral surface of the first functional section 21 and the outer peripheral surface of the second functional section 22, respectively.

That is, as shown in fig. 1 and 5, a transition section 23 is provided between the first functional section 21 and the second functional section 22, the outer circumferential surface of the transition section 23, that is, the side surface of the transition section 23 away from the axis of the impeller 20 forms a second arc-shaped transition surface 23a, a first end of the transition section 23 is connected to the first functional section 21, a second end of the transition section 23 is connected to the second functional section 22, and the radial dimension of the first end of the transition section 23 is the same as the dimension of the first functional section 21 near the end of the second functional section 22, so that the second arc-shaped transition surface 23a can be tangent to the outer circumferential surface of the first functional section 21 to avoid stress concentration, and the service life of the impeller 20 can be improved; the radial dimension of the second end of the transition section 23 is the same as the radial dimension of the end of the second functional section 22 near the first functional section 21, so that the second arc-shaped transition surface 23a can be tangent to the outer circumferential surface of the second functional section 22, so as to avoid stress concentration and improve the service life of the impeller 20.

In the present embodiment, the provision of the transition section 23 can not only prevent the stress concentration of the impeller 20 and improve the service life of the impeller 20, but also increase the water-beating area of the impeller 20 and improve the water-draining capability of the liquid draining device 100.

According to one embodiment of the present application, the dimension between the first curved transition surface 113a and the second curved transition surface 23a gradually decreases from the first chamber 111 to the second chamber 112.

Specifically, as shown in fig. 1 to 5, the curvature of the radial dimension of the transition chamber 113 is larger than that of the transition section 23, so that the dimension between the first arc-shaped transition surface 113a and the second arc-shaped transition surface 23a is gradually reduced from the first chamber 111 to the second chamber 112, so as to increase the large water area of the impeller 20 and improve the drainage capability of the liquid drainage device 100 while avoiding the concentration of stress of the impeller 20.

In some embodiments of the present application, the curvature of the second arcuate transition surface 23a is greater than the curvature of the first arcuate transition surface 113 a.

That is, the radian of the second arc-shaped transition surface 23a is larger than that of the first arc-shaped transition surface 113a, so that the problem of stress concentration of the impeller 20 during water pumping can be effectively avoided through the transition section 23, the service life of the impeller 20 can be prolonged, and the reliability of the liquid discharge device 100 can be improved.

According to one embodiment of the present application, the radial dimension of the first functional section 21 is 0.5 to 0.6 times the radial dimension of the liquid inlet 111a, and the radial dimension of the liquid outlet 112a is larger than the dimension of the second functional section 22 in the first direction.

Specifically, as shown in fig. 1, the diameter of the liquid inlet 111a is 13mm, and the radial dimension of the first functional section 21 is 0.5 to 0.6 times of 13mm, for example, the radial dimension of the first functional section 21 is 6.5mm, 7mm or 7.8mm, so that the size of the liquid inlet 111a relative to the first functional section 21 is larger, the liquid can enter the pump cavity 11 from the liquid inlet 111a conveniently, and the liquid discharging capability of the liquid discharging device 100 can be improved; the liquid outlet 112a may be a circular opening, and the radial dimension of the liquid outlet 112a is greater than the dimension of the second functional segment 22 in the first direction, so as to reduce the loss of kinetic energy of the inner wall of the second chamber 112 facing the liquid, and improve the liquid draining capability of the liquid draining device 100.

It should be noted that the radial dimension of the first functional section 21 may be determined according to actual requirements, which is not described in detail in the embodiments of the present application.

In some embodiments of the present application, in the first direction, the second functional segment 22 is located between the inner wall surfaces of the liquid outlet 112a in the first direction.

That is, as shown in fig. 1, in the axial direction of the impeller 20, the size of the second functional section 22 is smaller than or equal to the diameter of the liquid outlet 112a, and the position of the second functional section 22 corresponds to the position of the liquid outlet 112a, so that the liquid at the outer periphery of the second functional section 22 can directly flow out from the liquid outlet 112a, the loss of the kinetic energy of the liquid can be reduced, and the liquid discharging capability of the liquid discharging device 100 can be improved.

According to one embodiment of the present application, in the first direction, the dimension between the side of the outer periphery of the second functional section 22, which is close to the first functional section 21, and the inner wall surface of the liquid outlet 112a is d1, and the dimension between the side of the outer periphery of the second functional section 22, which is far from the first functional section 21, and the inner wall surface of the liquid outlet 112a is d2, d1 > d2.

Specifically, as shown in fig. 1, in the axial direction of the impeller 20, the dimension between the side of the outer periphery of the second functional section 22, which is close to the first functional section 21, and the inner wall surface of the liquid outlet 112a is larger than the dimension between the side of the outer periphery of the second functional section 22, which is far from the first functional section 21, and the inner wall surface of the liquid outlet 112a, so that the liquid can flow out of the liquid outlet 112a quickly after flowing into the second chamber 112 from the first chamber 111, and the liquid discharging capability of the liquid discharging device 100 can be improved.

In some embodiments of the present application, the liquid discharge apparatus 100 further includes: the motor 30 and the electric control plate, the motor 30 is arranged on the pump shell 10, and the motor 30 is in transmission connection with the impeller 20 to drive the impeller 20 to rotate; the electric control board is electrically connected with the motor 30, and is externally arranged on the pump shell 10 or integrated with an external electric control assembly.

That is, as shown in fig. 1 and 5, one end of the impeller 20 near the second chamber 112 is provided with a connection part, the connection part passes through the inner wall of the second chamber 112 and is rotationally connected with the second chamber, one end of the connection part far away from the second chamber 112 is connected with an output end of the motor 30, the motor 30 is fixedly connected with the pump housing 10, and the impeller 20 can be driven to rotate by controlling the motor 30 to rotate when in use, so that the liquid discharge device 100 can operate.

The motor 30 is also electrically connected with an electric control board, the electric control board is used for controlling the motor 30 to run, the outer side of the pump shell 10 can be provided with a mounting cavity, and the electric control board is detachably mounted in the mounting cavity so as to be convenient for mounting and replacing the electric control board; the electric control board can also be integrated in an external electric control assembly, so that the electric control board can be far away from a water source and the like, and is not easy to damage, and the reliability of the liquid discharge device 100 can be effectively improved.

In the prior art, in the BMC plastic packaging process of the direct current brushless water pump motor 30, the electronic control board components are easy to be impacted by injection molding pressure, so that the components can be damaged or soft and injured, and the components fail after long-term operation. Compared with the prior art, the liquid discharge device 100 of the present embodiment prevents the electric control board from being impacted by the pressure of BMC injection molding, and can effectively improve the reliability of the liquid discharge device 100.

It should be noted that other structures of the liquid discharge apparatus 100 according to the embodiment of the present application, such as the specific structure of the electric control plate and the function of the impeller 20, etc., and the operation thereof, are known to those skilled in the art, and will not be described in detail herein.

In summary, according to the liquid discharging device 100 of the embodiment of the present application, by gradually increasing the size between the outer peripheral surface of the first functional section 21 and the inner wall surface of the first chamber 111 from the liquid inlet 111a to the second chamber 112, the water containing space between the first functional section 21 and the inner wall surface of the first chamber 111 can be increased, so that more liquid enters the pump chamber 11, and meanwhile, the increased water containing space can perform a good internal depressurization function, so that the liquid can quickly enter the pump chamber 11 from the liquid inlet 111a, and the liquid discharging capability of the liquid discharging device 100 can be effectively improved, that is, the structure of the liquid discharging device 100 of the present application is used without changing the driving force to the impeller 20, and the liquid discharging capability can be effectively improved, so that the requirements of different flow intervals of clients can be met, the manufacturing cost and the energy consumption are low, and the practicability is strong.

Embodiments of the present application also provide a refrigeration system including the liquid discharge apparatus 100 described in any of the embodiments above. Because the liquid discharge device 100 according to the embodiment of the present application can solve the problem of poor liquid discharge capability of the existing low-power liquid discharge device, the refrigeration system according to the embodiment of the present application also has the advantages of low manufacturing cost and energy consumption, and strong practicability, and the embodiment of the present application is not described again.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A liquid discharge apparatus, comprising:

the novel water pump comprises a pump shell (10), wherein the pump shell (10) is provided with a pump cavity (11), the pump cavity (11) comprises a first cavity (111) and a second cavity (112) which are distributed along a first direction, one end, away from the second cavity (112), of the first cavity (111) is provided with a liquid inlet (111 a), and one side, in a second direction, of the second cavity (112) is provided with a liquid outlet (112 a);

an impeller (20), the impeller (20) being rotatably arranged in the pump chamber (11) about an axis extending in the first direction, the impeller (20) comprising a first functional section (21) and a second functional section (22) distributed in the first direction, the first functional section (21) being located in the first chamber (111), the second functional section (22) being located in the second chamber (112),

the dimension between the outer peripheral surface of the first functional section (21) and the inner wall surface of the first chamber (111) gradually increases from the liquid inlet (111 a) to the second chamber (112).

2. The liquid discharge device according to claim 1, wherein the pump chamber (11) further comprises:

a transition chamber (113), the transition chamber (113) being arranged between the first chamber (111) and the second chamber (112), the radial dimension of the transition chamber (113) gradually increasing from the first chamber (111) to the second chamber (112);

the inner wall surface of the transition chamber (113) is provided with a first arc-shaped transition surface (113 a), and the first arc-shaped transition surface (113 a) is tangent to the inner wall surface of the first chamber (111) and the inner wall surface of the second chamber (112) respectively.

3. The liquid discharge device according to claim 2, wherein the impeller (20) further comprises:

a transition section (23), wherein the transition section (23) is arranged between the first functional section (21) and the second functional section (22), and the radial dimension of the transition section (23) gradually increases from the first functional section (21) to the second functional section (22);

the outer peripheral surface of the transition section (23) forms a second arc-shaped transition surface (23 a), and the second arc-shaped transition surface (23 a) is tangent to the outer peripheral surface of the first functional section (21) and the outer peripheral surface of the second functional section (22) respectively.

4. A liquid discharge device according to claim 3, wherein the dimension between the first curved transition surface (113 a) and the second curved transition surface (23 a) gradually decreases from the first chamber (111) to the second chamber (112).

5. A liquid discharge device according to claim 3, wherein the curvature of the second curved transition surface (23 a) is greater than the curvature of the first curved transition surface (113 a).

6. The liquid discharge device according to claim 1, characterized in that the radial dimension of the first functional section (21) is 0.5-0.6 times the radial dimension of the liquid inlet (111 a), the radial dimension of the liquid outlet (112 a) being larger than the dimension of the second functional section (22) in the first direction.

7. The liquid discharge apparatus according to claim 6, wherein in the first direction, the second functional segment (22) is located between inner wall surfaces of the liquid outlet (112 a) in the first direction.

8. The liquid discharge apparatus according to claim 7, wherein in the first direction, a dimension between a side of the outer periphery of the second functional section (22) close to the first functional section (21) and an inner wall surface of the liquid outlet (112 a) is d1, and a dimension between a side of the outer periphery of the second functional section (22) away from the first functional section (21) and an inner wall surface of the liquid outlet (112 a) is d2, d1 > d2.

9. The liquid discharge device according to any one of claims 1 to 8, further comprising:

the motor (30) is arranged on the pump shell (10), and the motor (30) is in transmission connection with the impeller (20) so as to drive the impeller (20) to rotate;

the electric control board is electrically connected with the motor (30), and is arranged outside the pump shell (10), or is integrated in an external electric control assembly.

10. A refrigeration system comprising the liquid discharge apparatus of any one of claims 1 to 9.