CN216112467U - Throttling assembly, stop valve and refrigerating system thereof - Google Patents

Abstract

The utility model relates to the technical field of refrigeration, in particular to a throttling assembly, a stop valve and a refrigeration system thereof. The throttling assembly is characterized by comprising a first throttling element, wherein a first throttling hole and at least two mixing flow passages which are arranged at intervals are formed in the first throttling element, the first throttling hole is located at one end of the mixing flow passages, and the at least two mixing flow passages are respectively communicated with the first throttling hole. The medium is divided into a plurality of strands by the plurality of mixing flow channels and finally converged into the first throttling hole to collide with each other, so that kinetic energy in the medium is mutually rubbed and converted into internal energy, and the formation of bubbles is reduced; the position where the bubble is broken is positioned in the center of the throttling hole, so that the probability of breakage caused by the collision of the bubble with the wall surface is reduced, and the noise is reduced.

Description

Throttling assembly, stop valve and refrigerating system thereof

Technical Field

The utility model relates to the technical field of refrigeration, in particular to a throttling assembly, a stop valve and a refrigeration system thereof.

Background

In a refrigeration system, a throttling component is used for playing an important role in cutting off and throttling a medium in a pipeline where the throttling component is located, and the throttling component is applied to a stop valve and is mainly applied to cutting off the medium.

The existing throttling assembly has the advantages that the flow area of a medium is suddenly reduced when the medium passes through the throttling hole, the flow speed of the medium is suddenly and rapidly increased, the pressure behind the throttling hole reaches the saturated steam pressure of the medium, part of the medium can be gasified, the phenomenon of gas-liquid coexistence is caused, when bubbles flow to a high-pressure part, the bubbles are pressed by high pressure to be broken, the explosion of the bubbles can produce violent impact on the internal structure of the throttling assembly, the medium is severely disturbed in the valve cavity of the throttling assembly, noise is generated, and the service life of the throttling assembly and the user experience are influenced.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a throttling component aiming at the technical problem of higher noise, and the technical scheme is as follows:

a throttling assembly comprises a first throttling element, wherein a first throttling hole and at least two mixing flow passages which are arranged at intervals are formed in the first throttling element, the first throttling hole is located at one end of the mixing flow passages, and the at least two mixing flow passages are respectively communicated with the first throttling hole.

According to the arrangement, the medium is firstly divided into a plurality of strands of media through the plurality of mixing flow channels, the plurality of strands of media are finally converged into the first throttling hole after passing through the plurality of mixing flow channels, and when the plurality of strands of media impact the first throttling hole, collision and impact are generated among the plurality of strands of media, so that kinetic energy in the media is converted into internal energy due to mutual friction, and formation of bubbles is reduced; on the other hand, the position where the generated bubble is broken is positioned in the center of the throttling hole, so that the probability of the bubble breaking when colliding with the wall surface is reduced, and the flow-induced noise of the throttling component is effectively controlled.

In one embodiment, the cross-sectional area of each mixing channel is the same shape and the cross-sectional area of each mixing channel is the same.

So set up for medium flow and velocity of flow in each mixing channel keep unanimous, thereby guarantee that the medium fully collides, and the impact between each other is more balanced, thereby guarantees energy conversion's effect.

In one embodiment, the cross-sectional area of the first restriction orifice is greater than the cross-sectional area of any one of the mixing flow passages.

By the arrangement, the medium can be fully mixed and collided in the first throttling hole, the structure in the first throttling part is more harmonious, and the medium cannot pass through the first throttling hole due to too narrow degree, so that unnecessary turbulence is generated.

In one embodiment, one ends of the mixing flow channels close to the first throttling hole are close to each other, and an included angle between an axis of the mixing flow channel and the axial direction of the first throttling hole is larger than 0 degree and smaller than 90 degrees.

So set up, guaranteed that the mixing flow channel is close to each other, finally assemble together.

In one embodiment, the mixing channel has a circular or square or triangular cross-section.

So set up, do not limit the cross section of mixing the runner to single shape, reduced the processing degree of difficulty, reduced the processing cost to can correspond the shape that sets up mixing the runner according to operational environment, the adaptability is higher.

In one embodiment, the throttle assembly further comprises a second throttle member, the first throttle member being disposed within the second throttle member and being movable within the second throttle member in an axial direction of the second throttle member to bring the first throttle member into abutment with or out of abutment with the second throttle member.

So set up, when required throttle degree is less, first throttling element is backed down, does not participate in the throttle, and when required throttle degree is great, the stop valve reverse work, first throttling element and second throttling element butt, first throttling element participate in the throttle to can satisfy different throttle demands.

In one embodiment, a second orifice is opened in the second orifice, the second orifice being located apart from the mixing flow path with respect to the first orifice, an inner wall of the second orifice being formed in an arc shape, and a flow area of the second orifice gradually increases in a direction away from the first orifice.

So set up for when the medium flows in the second throttling element, pressure variation is comparatively slow, thereby avoids causing cavitation because of the pressure sudden change, produces the cavitation bubble, causes the noise.

In one embodiment, a second throttle hole is formed in the second throttle member, and the diameter of the second throttle hole at the end close to the first throttle hole is the same as the diameter of the first throttle hole.

According to the arrangement, the medium is prevented from generating pressure migration due to the change of the aperture size in the flowing process of the first throttling hole and the second throttling hole, so that cavitation is generated and noise is caused.

In one embodiment, a second throttle hole is formed in the second throttle member, and the first throttle hole and the second throttle hole are coaxially arranged.

By the arrangement, the flow paths of the medium in the first throttling hole and the second throttling hole are consistent, the flow process is smooth, and noise caused by impact on the wall surface of the first throttling element or the second throttling element is avoided.

A stop valve is characterized by comprising the throttling assembly, a hollow valve body, a first communicating pipe and a second communicating pipe, wherein the valve body is at least provided with a first opening and a second opening and is provided with a valve cavity; the valve core is arranged in the valve cavity and can move along the axial direction of the valve body so as to connect or disconnect a passage between the first opening and the second opening, the first communicating pipe is connected with the first opening, and the second communicating pipe is connected with the second opening.

In one embodiment, the throttle assembly is disposed within the first opening or the second opening or the first communication tube or the second communication tube.

In one embodiment, the throttle assembly is disposed within the first and second openings or the first and second communication tubes.

A refrigerating system comprises the stop valve.

Compared with the prior art, according to the throttling assembly provided by the utility model, the medium is firstly shunted into a plurality of strands of media through the plurality of mixing flow channels, the plurality of strands of media are finally converged into the first throttling hole after passing through the plurality of mixing flow channels, and when the plurality of strands of media impact the first throttling hole, collision and impact are generated among the plurality of strands of media, so that kinetic energy in the media is converted into internal energy due to mutual friction, and the formation of bubbles is reduced; on the other hand, the position where the generated bubble is broken is positioned in the center of the throttling hole, so that the probability of the bubble breaking when colliding with the wall surface is reduced, and the flow-induced noise of the throttling component is effectively controlled.

Drawings

FIG. 1 is a cross-sectional view of a throttle assembly provided by the present invention;

FIG. 2 is a perspective view of a throttle assembly provided by the present invention;

FIG. 3 is a cross-sectional view of a shut-off valve provided by the present invention;

FIG. 4 is a perspective view of a first orifice member provided in accordance with the present invention;

FIG. 5 is a perspective view of a second orifice member provided in accordance with the present invention;

FIG. 6 is a cross-sectional view of a first orifice member provided in accordance with the present invention;

FIG. 7 is a cross-sectional view of a second orifice member provided in accordance with the present invention;

FIG. 8 is a schematic diagram of the noise reduction provided by the present invention;

FIG. 9 is a cross-sectional view of a shut-off valve provided in accordance with the present invention with the throttling assembly backed up by media.

The symbols in the drawings represent the following meanings:

100. a stop valve; 10. a valve body; 11. a first opening; 12. a second opening; 13. a main body; 14. an end cap; 15. a valve cavity; 16. a first communication pipe; 20. a valve core; 21. an operation section; 22. a first groove; 23. a second groove; 24. a seal member; 30. a throttle assembly; 31. a first orifice member; 311. a mixing flow channel; 312. a first orifice; 32. a second orifice member; 321. a second orifice; 33. a flow guide cavity; 331. and (4) ribs.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-3, such a throttling assembly 30 is installed in a shut-off valve 100, and the throttling assembly 30 is located in a valve chamber 15 for throttling a medium.

The shutoff valve 100 is installed in a refrigeration system for accomplishing the communication and cutoff of pipes.

The shutoff valve 100 includes a valve body 10 and a valve spool 20, and the valve body 10 is connected to the valve spool 20. The valve body 10 is internally provided with a valve cavity 15, and the valve cavity 15 is used for accommodating components such as a valve core 20 and the like; the valve core 20 is disposed inside the valve chamber 15 and is axially movable along the valve body 10.

The valve body 10 is also provided with at least a first opening 11 and a second opening 12. In the present embodiment, when the shut-off valve 100 is installed vertically as in the drawings of the specification, the first opening 11 and the second opening 12 are opened at the lower side and the right side of the valve body 10, and the valve chamber 15 communicates with the outside through the first opening 11 and the second opening 12.

A first communication pipe 16 is connected to a port of the first opening 11 far from the valve element 20, and the first opening 11 and the second opening 12 are respectively used as an inlet or an outlet of a medium. When the first opening 11 is used as a medium inlet, the medium enters the valve body 10 through the first communication pipe 16 and the first opening 11, and if the stop valve 100 is in an open state, the medium flows out of the stop valve 100 through the second opening 12; vice versa, the medium can also enter the valve chamber 15 via the second opening 12 and exit the shut-off valve 100 via the first opening 11 and the first communication duct 16.

In this embodiment, a second communication pipe is not disposed at the second opening 12, and in other embodiments, a second communication pipe may be further disposed at the second opening 12 for communicating with an external pipeline.

Alternatively, the positions of the first opening 11 and the second opening 12 are not limited to being opened on the lower side and the right side of the valve body 10 in the present embodiment. In other embodiments, the first opening 11 and the second opening 12 may be provided on the left and right sides, the upper and lower sides, and the like of the valve body 10, as long as the communication or the blocking between the first opening 11 and the second opening 12 can be achieved by the axial movement of the valve spool 20.

The valve body 10 further comprises a main body 13 and an end cap 14, the main body 13 being located on a side of the valve body 10 remote from the first opening 11, being arranged opposite the first opening 11 and being coaxial with the first opening 11 in this embodiment. The body 13 is used for limiting the valve core 20, and the valve core 20 moves axially along the body 13, so that the stop valve 100 can be switched between the opening state and the closing state. The end cap 14 is located at the topmost end of the main body 13 and is sleeved outside the main body 13, so that impurities such as external dust and powder are prevented from entering the valve body 10, the sealing performance of the switch valve of the stop valve 100 and the purity of media entering the valve body 10 are prevented from being influenced, and the realization of other related functions of the stop valve 100 is prevented from being influenced.

The valve spool 20 includes an operating portion 21, a second groove 23, and a seal 24. The operating part 21 is positioned on one side of the valve core 20 close to the end cover 14 and used for enabling the valve core 20 to rotate under stress, so that the valve core 20 is driven to do axial lifting motion; the second groove 23 is positioned on the outer periphery side of the valve core 20 close to the end cover 14, is arranged around the valve core 20 and is used for installing a sealing piece 24; the sealing member 24 is inserted into the second groove 23 to isolate the cavity on the upper and lower sides of the sealing member 24. The seal 24 is provided in the second groove 23, an inner peripheral side of the seal 24 abuts against the second groove 23, and an outer peripheral side of the seal 24 is in close contact with an inner wall of the main body 13, thereby sealing the valve chamber 15.

In particular, the operating portion 21 is provided with a first groove 22, the notch of the first groove 22 facing the end cap 14, for acting as a force-bearing segment when the operating portion 21 is screwed by an external tool. The side wall of the first groove 22 is provided with a plurality of planes which are uniformly distributed, and in the first embodiment, six planes on the side wall of the first groove 22 form a regular hexagon so as to adapt to the operation of an outer hexagon tool. Alternatively, in other embodiments, the number of planes on the inner side wall of the first groove 22 may also be set to be three, four, five, seven, eight, etc. to adapt to different tools, and the shape of the first groove 22 may be adjusted according to the working environment and the external operation tool, and is not limited to the hexagon described in this embodiment.

In the working process of the valve core 20, the end cover 14 at the top of the main body 13 needs to be unscrewed, an external operating tool is inserted into the first groove 22, the valve core 20 is screwed through the matching of the operating tool and the first groove 22, and finally the valve core 20 performs axial lifting movement through the threaded matching between the valve core 20 and the valve body 10, so that the opening and closing of the stop valve 100 are realized.

The stop valve 100 further comprises a throttle assembly 30, and specifically, referring to fig. 1 and fig. 4 to 5, the throttle assembly 30 comprises a first throttle 31 and a second throttle 32, the first throttle 31 is located inside the second throttle 32, the second throttle 32 is located inside the valve body 10 and connected to the inner wall of the valve body 10, and the first throttle 31 and the second throttle 32 cooperate to form a throttle passage for throttling the medium flowing into the valve body 10.

In this embodiment, the throttling assembly 30 is installed in the first opening 11, and in other embodiments, the throttling assembly may also be installed in the second opening 12, or in the first communicating pipe 16, or in the second communicating pipe. The throttle assembly may also be disposed within the first and second openings or the first and second communication tubes.

Referring to fig. 3 and 9, the first orifice member 31 and the second orifice member 32 are provided separately, the second orifice member 32 is connected to the inner wall of the valve body 10, and the first orifice member 31 is movable in the second orifice member 32 in the axial direction of the shut valve 100 to bring the first orifice member 31 into and out of abutment with the second orifice member 32. After the refrigeration and heating of the refrigeration system are switched, the lengths of the required throttling holes are different, namely, the required throttling degrees are different, the first throttling piece 31 and the second throttling piece 32 are arranged in a split mode, when the required throttling degree is small, the first throttling piece 31 is pushed open and does not participate in throttling, the second throttling piece 32 does not move, when the required throttling degree is large, the stop valve 100 works in the reverse direction, the first throttling piece 31 is abutted to the second throttling piece 32, the first throttling piece 31 participates in throttling, and therefore different throttling requirements can be met.

Optionally, the first throttling element 31 and the second throttling element 32 may be integrally formed to enhance the structural stability of the throttling assembly 30.

Referring to fig. 6-7, a first throttle 312 and at least two mixing channels 311 are disposed in the first throttle 31, the mixing channels 311 are communicated with the second opening 12, the first throttle 312 is disposed at an end of the mixing channel 311 away from the second opening 12, and the at least two mixing channels 311 are respectively communicated with the first throttle 312. According to the arrangement, the medium is firstly divided into a plurality of strands of media through the plurality of mixing flow channels 311, the plurality of strands of media are finally gathered in the first throttling hole 312 after passing through the plurality of mixing flow channels 311, and when the plurality of strands of media impact the first throttling hole 312, collision and impact are generated among the plurality of strands of media, so that kinetic energy in the media is converted into internal energy due to mutual friction, and formation of bubbles is reduced; on the other hand, the position where the generated bubble is broken is positioned in the center of the throttling hole, so that the probability that the bubble is collided with the wall surface to be broken is reduced, and the flow-induced noise of the throttling component is effectively controlled.

It is understood that the number of the mixing channels 311 may be 2, 3, 4, 5, 6, etc., and the number of the mixing channels 311 should be set according to the actual operation of the shut-off valve 100, and is not limited to the two mixing channels 311 spaced apart from each other in the embodiment.

The cross-sectional shapes of the mixing flow channels 311 are the same, and the cross-sectional areas of the mixing flow channels 311 are also the same, so that the flow rate and the flow velocity of the medium in each mixing flow channel 311 are kept consistent, the medium is fully collided, the impact among the medium and the medium is more balanced, and finally the energy conversion efficiency is higher.

Optionally, the cross section of the mixing flow channel 311 is circular, square or triangular, so that the mixing flow channel 311 does not need to be processed into a single shape, the processing difficulty and the processing cost are reduced, the shape of the mixing flow channel 311 can be correspondingly set according to the working environment, and the adaptability is higher.

Further, one ends of the mixing flow passages 311 close to the first opening 11 are close to each other, and an included angle between an axis of the mixing flow passage 311 and an axial direction of the valve cavity 15 is greater than 0 degree and smaller than 90 degrees, that is, an included angle between an end surface of the first throttling element 31 far away from the first opening 11 is greater than 0 degree and smaller than 90 degrees, that is, axes of the mixing flow passages 311 are obliquely arranged relative to an axis of the valve cavity 15, so that the mixing flow passages 311 are close to each other and finally converge together.

The first orifice 312 is a passage through which the medium flows from the mixing flow passage 311 to the second orifice 32, and has a cross-sectional area larger than that of any one of the mixing flow passages 311, and is arranged so that the medium flowing out of the mixing flow passage 311 is sufficiently mixed in the first orifice 312, and the structure in the first orifice 31 is more harmonious, and when the flow rate of the medium is large, the medium does not pass through due to too narrow of the first orifice 312, and unnecessary turbulence and the like occur, thereby affecting the throttling effect.

Second orifice 32 passes through buckle detachably with the inner wall of valve body 10 and is connected, so set up, can adjust the orifice according to operational environment and work demand, promptly, the size of orifice in the adjustment orifice, the size of orifice radian etc.. Optionally, the second throttling element 32 and the valve body 10 may also be welded or the like to enhance the connection strength of the two.

The second throttling hole 321 is formed in the second throttling element 32, the inner wall of the second throttling hole 321 is arc-shaped, and the flow area of the second throttling hole 321 is gradually increased along with the direction far away from the first throttling element 31, so that the speed of the medium is changed more slowly in the flowing process, the pressure mutation is delayed, the cavitation degree of the medium when passing through the second throttling hole 321 is further inhibited, the generation of bubbles is reduced, the flow-induced noise generated by the stop valve 100 in the using process is effectively controlled, the service life is prolonged, and the user experience is improved.

Alternatively, the inner wall of the second throttle hole 321 may be provided in a cylindrical shape to facilitate machining.

The first throttle hole 312 and the second throttle hole 321 are coaxially arranged, thereby ensuring smooth flow of the medium in the path without generating noise due to impact on the inner wall.

The diameter of the second orifice 321 near the first orifice 312 is the same as that of the first orifice 312, so that the medium is prevented from generating pressure migration due to the change of the diameter of the orifice during the flowing process of the first orifice 312 and the second orifice 321, and generating cavitation phenomenon to cause noise.

The principle that the circular arc inner wall can reduce noise is as follows:

referring to fig. 8, when a fluid having a pressure P flows through the orifice, the flow rate of the medium (dotted line in the figure) abruptly increases and the static pressure abruptly decreases due to the small orifice. When the pressure P behind the hole reaches the saturated vapor pressure Pv under the condition of the fluid, part of the fluid is vaporized into gas to generate bubbles, and the phenomenon of coexistence of gas phase and liquid phase is formed, and the phenomenon is called as a flash evaporation stage. When the pressure of the medium thereafter rises back above the saturation pressure, the rising pressure compresses the bubble causing it to burst, referred to as the cavitation phase. When the bubble is broken, all the energy is concentrated on the breaking point to produce several thousand newton impact force, and the pressure of the impact wave is up to 2

10^3MPa, thereby to produce the huge impact vibration to valve body 10, simultaneously, the noise production.

The circular arc inner wall can avoid the speed mutation of the medium in the throttling hole, the lower the speed at the throttling hole, the higher the static pressure, and the farther the pressure value of the saturated steam of the refrigerant, the more difficult the bubbles are generated, thereby inhibiting the phenomena of flash evaporation and cavitation, and finally achieving the purpose of controlling the flow-induced noise.

The outer peripheral surface of the first throttling element 31 is further provided with a plurality of ribs 331, and the ribs 331 extend in the radial direction and can be matched with the inner wall of the second throttling element 32 to form a flow guide cavity 33. When the first throttling element 31 is jacked open by a high-speed high-pressure medium, the medium can smoothly pass through the flow guide cavity 33, and impact noise, edge noise and turbulent noise generated by the medium and the inner wall of the throttling element can be reduced because of no abrupt change of the flow channel.

Preferably, the ribs 331 extend radially and abut against the inner wall of the second throttling element 32, so as to enhance the flow guiding effect and prevent the flow guiding cavities 33 from being connected in series. Alternatively, the ribs 331 may not abut against the inner wall of the second throttling element 32, and may also play a role in guiding the flow.

The utility model also provides a stop valve 100 comprising the above-mentioned throttling assembly 30, wherein the throttling assembly 30 is arranged in the stop valve 100 and is used for throttling the medium.

The utility model also provides a refrigerating system, which comprises the stop valve 100, wherein the stop valve 100 is arranged in a medium passage of the refrigerating system to control the blocking and the circulation of the passage and is used for supplementing the medium to the refrigerating system.

In the working process of the stop valve 100, when the stop valve 100 needs to be closed, the operating part 21 at the top of the stop valve 100 is screwed, the operating part 21 drives the valve core 20 to synchronously rotate, and the valve core 20 performs axial lifting motion through the matching of the valve core 20 and the valve body 10 to seal the first opening 11, so that the cut-off between the first opening 11 and the second opening 12 is realized. When the stop valve 100 is in the open state, if the medium flows to the first opening 11 from the valve cavity 15, the medium is split by the mixing flow channel 311 and then is gathered to the first orifice 312, at this time, the kinetic energy of the medium is converted into internal energy, the cavitation phenomenon is reduced, and the noise generated during the operation is reduced; if the medium flows into the valve chamber 15 from the first opening 11, the high-speed and high-pressure medium pushes the first orifice 31 open, so that a larger space for the medium to flow is created, thereby reducing the throttling effect of the orifice and increasing the flow rate of the medium.

Compared with the prior art, the throttling assembly 30 provided by the utility model has the advantages that the medium is firstly divided into a plurality of strands of media through the plurality of mixing flow channels 311, the plurality of strands of media are finally gathered in the first throttling hole 312 after passing through the plurality of mixing flow channels 311, and when the plurality of strands of media impact the first throttling hole 312, collision and impact are generated among the plurality of strands of media, so that kinetic energy in the media is converted into internal energy due to mutual friction, and the formation of bubbles is reduced; on the other hand, the position where the generated bubble is broken is positioned at the center of the throttling hole, so that the probability of the bubble breaking due to the collision with the wall surface is reduced, and the flow-induced noise of the throttling assembly 30 is effectively controlled.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. The throttling assembly is characterized by comprising a first throttling element (31), wherein a first throttling hole (312) and at least two mixing flow passages (311) arranged at intervals are formed in the first throttling element (31), the first throttling hole (312) is located at one end of the mixing flow passages (311), and the at least two mixing flow passages (311) are respectively communicated with the first throttling hole (312).

2. A throttle assembly as set forth in claim 1 characterized in that the shape of the cross-section of each mixing flow passage (311) is the same and the cross-sectional area of each mixing flow passage (311) is the same.

3. A throttle assembly as set forth in claim 1 characterized in that the cross sectional area of said first throttle bore (312) is larger than the cross sectional area of any of said mixing flow passages (311).

4. A throttle assembly as set forth in claim 1 characterized in that said plurality of mixing channels (311) converge towards each other at the end near said first orifice (312) and the axis of said mixing channels (311) is angled from the axial direction of said first orifice (312) by more than 0 degrees and less than 90 degrees.

5. A throttle assembly as claimed in claim 1, characterized in that the cross-section of the mixing flow channel (311) is circular or square or triangular.

6. A throttle assembly according to claim 1, characterized in that it further comprises a second throttle member (32), said first throttle member (31) being provided within said second throttle member (32) and being movable within said second throttle member (32) in the axial direction of said second throttle member (32) to bring said first throttle member (31) into or out of abutment with said second throttle member (32).

7. The throttle assembly according to claim 6, characterized in that a second throttle hole (321) is opened in the second throttle member (32), the second throttle hole (321) being disposed away from the mixing flow passage (311) with respect to the first throttle hole (312), an inner wall of the second throttle hole (321) having a circular arc shape, and a flow area of the second throttle hole (321) is gradually increased in a direction away from the first throttle member (31).

8. The throttle assembly according to claim 6, characterized in that a second throttle hole (321) is opened in the second throttle member (32), and the diameter of the second throttle hole (321) at the end close to the first throttle hole (312) is the same as the diameter of the first throttle hole (312).

9. The throttle assembly of claim 6, characterized in that a second throttle hole (321) is opened in the second throttle member (32), and the first throttle hole (312) and the second throttle hole (321) are coaxially arranged.

10. A stop valve, characterized by comprising a throttle assembly as claimed in any one of claims 1 to 9, a hollow valve body (10), a first communicating pipe (16) and a second communicating pipe, wherein the valve body (10) is provided with at least a first opening (11) and a second opening (12), and the valve body (10) is provided with a valve cavity (15); the valve core (20) is arranged in the valve cavity (15) and can move along the axial direction of the valve body (10) so as to connect or disconnect a passage between the first opening (11) and the second opening (12), the first communication pipe (16) is connected with the first opening (11), and the second communication pipe is connected with the second opening (12).

11. A shut-off valve according to claim 10, characterised in that the throttling assembly is arranged in the first opening (11) or the second opening (12) or the first communication duct (16) or the second communication duct.

12. A shut-off valve according to claim 10, characterised in that the throttle assembly is arranged in the first opening (11) and the second opening (12) or in the first communication duct (16) and the second communication duct.

13. A refrigeration system comprising a shut-off valve as claimed in any one of claims 1 to 12.

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