CN109210239B

CN109210239B - Rotary reversing valve and refrigerating system thereof

Info

Publication number: CN109210239B
Application number: CN201710532497.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2017-07-03
Filing date: 2017-07-03
Publication date: 2020-08-11
Anticipated expiration: 2037-07-03
Also published as: CN109210239A

Abstract

The invention discloses a rotary reversing valve and a refrigerating system using the same, the rotary reversing valve comprises a cover body and a valve core component arranged in the inner cavity of the cover body, characterized in that the cover body includes a body portion and upper/lower end cover portions, a first axial flow path port and a second axial flow path port provided on the upper/lower end cover portions, respectively, a first radial flow path port and a second radial flow path port provided on the body portion with axial symmetry, the rotary reversing valve provided by the invention has the advantages that the flow channel structure of a refrigerating system can be kept consistent in a refrigerating mode or a heating mode, the parameter control can be optimized, the pressure loss of a medium is reduced, and the system energy efficiency is improved.

Description

Rotary reversing valve and refrigerating system thereof

Technical Field

The invention relates to the technical field of refrigeration system control, in particular to a rotary reversing valve and a refrigeration system using the same.

Background

In a refrigeration system, a reversing valve is generally adopted to realize the conversion function between refrigeration and heating. With the development of industry, large-scale refrigeration equipment is also continuously applied to the refrigeration industry. The requirement on the refrigerating capacity of the reversing valve is continuously increased, and the size of a reversing valve product needs to be large, so that the rotary reversing valve with a large structure is mostly adopted for carrying out the function switching of the refrigeration/heating of the system.

In the structure of a large reversing valve, the position of a switching channel with a larger caliber, which is designed and arranged on a valve core, is often limited by the structure of the valve core, and the design of a flow channel of the valve core can not carry out energy-saving optimization design according to the characteristics of a refrigerating system, so that the rotary reversing valve can meet or approach the requirements of ideal control parameters at the same time in the refrigerating stage and the heating stage. When the system refrigerant flows through the internal flow channel of the reversing valve, pressure loss caused by flow channel change can be generated, so that heat energy loss is generated, and the system energy efficiency is reduced.

Therefore, how to reduce the difference of the flow performance of the reversing valve in the cooling and heating modes, optimize the parameter control of the refrigeration system and reduce the energy consumption through the structural design is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above, the present invention provides a rotary type directional control valve, including a housing and a valve core member disposed in an inner cavity of the housing, the housing including a body portion and upper/lower end cover portions, a first axial flow path port and a second axial flow path port respectively disposed on the upper/lower end cover portions, a first radial flow path port and a second radial flow path port disposed on the body portion, the valve core member being rotatable relative to the body portion of the housing, the valve core member including a first flow passage and a second flow passage, the first flow passage communicating the first axial flow path port with the first radial flow path port, the second flow passage communicating the second axial flow path port with the second radial flow path port when the valve core member is in a first switching position; when the spool member is rotated to a second switching position, the first flow passage communicates the first axial flow passage port with the second radial flow passage port, and the second flow passage communicates the second axial flow passage port with the first radial flow passage port.

Meanwhile, the invention also provides a refrigerating system which comprises a compressor, a first heat exchanger, a second heat exchanger and the rotary reversing valve, wherein the first axial flow path port is communicated with the inlet end of the compressor, and the second axial flow path port is communicated with the outlet end of the compressor; alternatively, the first radial flow path port communicates with an inlet end of the compressor and the second radial flow path port communicates with an outlet end of the compressor.

According to the rotary reversing valve and the refrigeration system using the reversing valve, four connecting pipes of the reversing valve are divided into two groups and are respectively arranged in the axial direction and the radial direction of the cylindrical cover body, two connecting pipes connected with the inlet/outlet end of a compressor can be arranged in the axial position, and the connecting pipes of two switching channels are arranged in the radial position; or, two connection pipes connected to the inlet/outlet end of the compressor are disposed at a radial position, and two connection pipes switching the channel are disposed at an axial position. Compared with the prior art, the valve core component in the inner cavity of the cover body is arranged, and each switching channel can be arranged by utilizing larger internal space allowance. The flow passages at the first switching position and the second switching position can be symmetrically arranged, namely, no matter at the first switching position or the second switching position, all the reversing passages can be arranged through an axial section-radial section, and the flow performance and the structure of all the passages are kept consistent before and after reversing. The refrigerating system can carry out optimization design or parameter optimization on related control elements conveniently, so that the energy consumption of the refrigerating system can be controlled in a balanced manner no matter in a refrigerating mode or a heating mode, the pressure loss of a medium is reduced, and the energy efficiency of the system is improved.

As a further technical extension on the basis of the foregoing, the first flow passage of the valve core member includes a first axial valve hole, a first radial valve hole, and a second radial valve hole that penetrate each other, and the first axial valve hole is normally open to the first axial flow passage port; the second flow channel of the valve core component comprises a second axial valve hole, a third radial valve hole and a fourth radial valve hole which are communicated with each other, and the second axial valve hole and the second axial flow path port are normally communicated;

further, if the rotational angle of the valve core member from the first switching position to the second switching position is set to Q, and the plane defined by the axis of the first radial valve hole and the axis of the second radial valve hole is a first cross section (Z1) perpendicular to the axial direction of the valve core member, the angle formed by the axis of the first radial valve hole and the axis of the second radial valve hole is Q; a plane defined by the axis of the third radial valve hole and the axis of the fourth radial valve hole is a second cross section (Z2) perpendicular to the axial direction of the valve core component, and then the included angle between the axis of the third radial valve hole and the axis of the fourth radial valve hole is Q;

further, the first cross section (Z1) and the second cross section (Z2) are overlapped to form a cross section (Z), and the first radial valve hole, the second radial valve hole, the third radial valve hole and the fourth radial valve hole are symmetrically arranged on the overlapped cross section (Z);

further, the valve element component comprises a cylindrical switching part and a connecting pipe part which axially extends from two ends of the switching part and has a reduced outer diameter, the first radial valve hole, the second radial valve hole, the third radial valve hole and the fourth radial valve hole are arranged on the switching part, and the first axial valve hole and the second axial valve hole are respectively arranged on the connecting pipe part;

furthermore, the outer end part of the connecting pipe part is provided with a step part with reduced outer diameter, the upper end cover part and the lower end cover part are respectively provided with a groove, and a bearing is arranged between the step part and the groove;

further, the first radial valve hole, the second radial valve hole, the third radial valve hole and the fourth radial valve hole have approximately the same diameter;

further, the first radial valve hole, the second radial valve hole, the third radial valve hole, the fourth radial valve hole, the first axial valve hole and the second axial valve hole have approximately equal diameters;

further, the first axial valve hole is communicated with the first radial valve hole and the first axial valve hole is communicated with the second radial valve hole through an arc-shaped flow passage; the second axial valve hole is communicated with the third radial valve hole and the second axial valve hole is communicated with the fourth radial valve hole through an arc-shaped flow passage;

further, when the spool member is in the first switching position, the flow areas of the first flow passages in the fluid flow direction are substantially equal, and the flow areas of the second flow passages in the fluid flow direction are substantially equal; when the valve core component is at the second switching position, the flow areas of the first flow passages along the fluid flow direction are approximately equal, and the flow areas of the second flow passages along the fluid flow direction are approximately equal;

further, a flow area of each flow passage in the fluid flow direction when the valve body member is at the first switching position is substantially equal to a flow area of each flow passage in the fluid flow direction when the valve body member is at the second switching position.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1: the invention provides an appearance structure schematic diagram of a rotary reversing valve with a specific structure;

FIG. 2: the invention provides a refrigeration system diagram of a rotary reversing valve in a first switching state;

FIG. 3: the invention provides a refrigeration system diagram of a rotary reversing valve in a second switching state;

FIG. 4: the invention provides a structure schematic diagram of a valve core component of a rotary reversing valve;

FIG. 5: FIG. 4 is a left side view in cross section Z of the valve core member;

FIG. 6: FIG. 4 is a right side view in cross section of the valve core member taken in the Z-cross section;

FIG. 7: FIG. 4 is a front view in cross-section of the valve core member in the X-axis plane;

FIG. 8: FIG. 4 is a front view in cross-section of the valve core member in the Y-axis plane;

FIG. 9: the invention provides a cross-sectional structure schematic diagram of another rotary reversing valve.

The designations in FIGS. 1-9 indicate:

100-rotary reversing valves;

200-a compressor;

300-a first heat exchanger;

400-a first heat exchanger;

500-a throttling element;

10-a cover body;

11-a body portion, 12-a first end cap portion, 13-a second end cap portion;

14-a bearing;

21-first axial flow path port, 22-second axial flow path port;

31-a first radial flow path port, 32-a second radial flow path port;

40-a spool part;

41-a first flow channel;

411 — first axial valve bore;

412-the first radial valve bore, 413-the second radial valve bore;

42-a second flow channel;

421-second axial valve bore;

422-third radial valve bore, 423-fourth radial valve bore.

43-switching part, 44-connecting pipe part;

441-steps, 442-grooves.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of an appearance of a rotary reversing valve with a specific structure provided by the invention.

As shown in fig. 1. The rotary type directional control valve 100 includes a cylindrical cover body 10, the cover body 10 includes a body portion 11 formed by machining a metal pipe in the middle, and an upper end cover portion 12 and a lower end cover portion 13 fixedly attached to both ends of the body portion 11 by bolts, respectively. The first axial flow path port 21 is welded to the upper end cover portion 12 in the central axis direction; the second axial flow passage port 22 is welded to the lower end cover portion 13 along the center axis direction. The first radial flow path port 31 and the second radial flow path port 32 are welded to the body portion 11. The first radial flow path port 31 and the second radial flow path port 32 are symmetrically arranged in a cross section perpendicular to the axial direction of the cap body 10.

Fig. 2 is a diagram of a refrigeration system in a first switching state of the rotary reversing valve of the present invention, and fig. 3 is a diagram of a refrigeration system in a second switching state of the rotary reversing valve of the present invention.

As shown in fig. 2 and 3. In this particular embodiment, the refrigeration system includes a compressor 200, a first heat exchanger 300, a rotary reversing valve 100, a throttling element 500, and a second heat exchanger 400 in communication by piping. Wherein the first radial flow path port 31 of the rotary direction valve 100 communicates with the inlet end of the compressor 200, and the second radial flow path port 32 communicates with the outlet end of the compressor 200. The first axial flow path port 21 communicates with the second heat exchanger 400; the second axial flow path port 22 communicates with the first heat exchanger 300. The throttling element 500 is disposed between the first heat exchanger 300 and the second heat exchanger 400.

The valve core component 40 is arranged in the inner cavity of the cover body 10, and the flow passage of the refrigeration system is switched by rotating the valve core component 40 around the axis of the cover body 10. In a first switching state of the rotary direction valve, the first axial flow path port 21 communicates with the first radial flow path port 31, and the second axial flow path port 22 communicates with the second radial flow path port 32; in a second switching state of the rotary direction valve, the first axial flow path port 21 communicates with the second radial flow path port 32, and the second axial flow path port 22 communicates with the first radial flow path port 31. This can realize the conversion of the cooling or heating of the refrigeration system.

Fig. 4 is a schematic structural view of a valve core component 40 of a rotary reversing valve according to the present invention, fig. 5 is a left side view of a section of the valve core component in a Z cross section perpendicular to an X-axis plane, fig. 6 is a right side view of a section of the valve core component in a Z cross section perpendicular to the X-axis plane, fig. 7 is a front view of a section of the valve core component in the X-axis plane, and fig. 8 is a front view of a section of the valve core component in a Y-axis plane perpendicular to the X-axis plane.

As shown in fig. 4, 5, 6, 7 and 8.

The spool member 40 is generally a rotator structure having smaller diameters on both sides and a larger diameter in the middle. Specifically, the switching portion 43 includes a middle cylindrical switching portion 43, and the switching portion 43 extends axially toward both ends and is reduced in outer diameter to form a connecting tube portion 44. At the end of the connecting tube portion 44, there is a stepped portion 441 with a reduced diameter, and on the upper end cover portion and the lower end cover portion, there are provided central grooves 442, and two bearings 14 are respectively provided between the stepped portion 441 and the grooves 442 at both ends of the spool member 40, so that the spool member 40 can rotate about the axis of the cover 10.

As viewed in the Z-cross-sectional direction (see fig. 5 and 6), the switching portion 44 of the spool member 40 is provided with four radial valve holes in this order: the first, second, third and fourth radial valve bores 412, 413, 422 and 423. The above four valve holes extend to the outer edge surface of the valve core component 40 to form valve ports.

The connecting tube portion 45 of the valve body member 40 is provided with a first axial valve hole 411 and a second axial valve hole 421 in the axial direction when viewed from the central X-axis plane and the Y-axis plane.

The first flow passage 41 includes a first axial valve bore 411, a first radial valve bore 412 and a second radial valve bore 413. The first axial valve hole 411 communicates with the first radial valve hole 412 through an arc-shaped passage; the first axial valve bore 411 communicates with the second radial valve bore 413 through an arc-shaped passage.

The second flow passage 42 includes a second axial valve hole 421, a third radial valve hole 422, and a fourth radial valve hole 423. The second axial valve hole 421 is communicated with the third radial valve hole 422 through an arc-shaped channel; the second axial valve hole 421 communicates with the fourth radial valve hole 423 through an arc-shaped passage.

The angle of rotation of the valve body member 40 from the first switching position to the second switching position is Q (the valve body member 40 is in the first switching position in the state shown in fig. 4, and the valve body member 40 is rotated by Q degrees in the counterclockwise direction, that is, the Y-axis plane is rotated to the X-axis plane, which is the second switching position). In this embodiment, the first radial valve bore 412 and the second radial valve bore 413 are symmetrically disposed in the Z cross-section; the third radial valve bore 422 and the fourth radial valve bore 423 are symmetrically disposed in the Z cross-section, with the angle of rotation Q being 90 ° in particular.

When in the first switching position or the second switching position, one of the first flow passage 41 and the second flow passage 42 of the valve core member is communicated with the radial connecting pipe on the body portion 11, and the other opposite radial valve hole is closed by the inner circular surface of the body portion 11.

In the above solution, the inner hole diameters of the first axial valve hole 411, the first radial valve hole 412 and the second radial valve hole 413 of the first flow channel 41 can be designed to be equal, and the arc-shaped channel and the valve hole are in tangential smooth transition; the diameters of the inner holes of the second axial valve hole 421, the third radial valve hole 422 and the fourth radial valve hole 423 of the second flow passage 42 are designed to be equal, and the arc-shaped channels are tangent to the valve holes and smoothly transited. It is further possible to design the valve hole of the first flow passage 41 and the valve hole of the second flow passage 42 to have the same structure and hole diameter.

As described above, in the rotary switching valve 100, the flow paths of the first flow path 41 and the second flow path 42 are equal-diameter holes or equal-diameter arcs regardless of the first switching position or the second switching position, and the cross-sectional area of the flow paths perpendicular to the flow direction (i.e., the flow area of the flow paths) is substantially constant as the flow paths extend. Therefore, the flow calibers of the flow passages are approximately kept consistent in different switching states, and the fluid pressure loss caused by the change of the calibers of the flow passages is reduced.

On the other hand, the design ensures that the influence of the flow channel on the fluid is consistent when the rotary reversing valve is in the first switching position and the second switching position, so that the optimal design and parameter optimization can be carried out on the corresponding control element, and the system can effectively utilize energy in a cooling mode or a heating mode.

In the technical scheme provided by the invention, the first flow passage 41 and the second flow passage 42 have the same flow passage design, and fluid can directly approximate to flow through a right-angle elbow when flowing through the switching valve, so as to be a different extension scheme from the arrangement of the refrigeration system in the figure, the first axial flow passage port 21 is communicated with the inlet end of the compressor 400, the second axial flow passage port 22 is communicated with the outlet end of the compressor, and the first radial flow passage port 31 and the second radial flow passage port 32 are communicated with the heat exchanger, so that the circulation capacity of media in the system can be kept unchanged, and the external installation of the product is flexible and diversified on the premise of ensuring the reversing performance of the refrigeration system.

Fig. 9 is a schematic cross-sectional view of another rotary reversing valve according to the present invention.

As shown in fig. 9. Unlike the previous versions, in this embodiment the first cross-section defined by the axis of the first radial valve bore and the axis of the second radial valve bore is Z1; the second section defined by the axis of the third radial valve bore and the axis of the fourth radial valve bore is Z2, both section Z1 and section Z2 are cross sections taken perpendicular to the axis of the spool member, and section Z1 is offset from section Z2. This structure can also achieve the beneficial effects proposed by the present invention, and will not be described herein again.

It is to be understood that the definitions of "substantially constant flow area" and "substantially equal aperture diameter" of the valve hole in the present invention are based on the fact that the "area" or "aperture diameter" thereof changes within a certain range without substantially affecting the fluid pressure in the flow passage, and therefore, the change amount is generally within a range of 7%, which is defined as "substantially equal" in the present invention.

In addition, in the above technical solution, because of the structural design requirement, two radial passages of the same flow passage need to be connected in a penetrating manner, and a variable "flow area" is inevitably generated at a penetrating intersection, but because one of the passages is closed, the fluid flow performance is not substantially affected, and the beneficial effect of the present invention is affected.

It should be understood that the terms "upper, lower, inner and outer" are established based on the positional relationship shown in the drawings, and the corresponding direction and positional relationship may vary according to the orientation of the product shown in the drawings, and therefore, the protection scope is not to be interpreted as being absolutely limited.

The rotary reversing valve and the refrigeration system thereof provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A rotary reversing valve comprising a housing and a spool member disposed in an internal cavity of the housing, wherein the housing comprises a body portion and an upper end cap portion, a lower end cap portion, first and second axial flow ports disposed on the upper and lower end cap portions, respectively, first and second radial flow ports disposed on the body portion, the spool member being rotatable relative to the housing body portion, the spool member comprising first and second flow passages, the first flow passage communicating the first axial flow port with the first radial flow port and the second flow passage communicating the second axial flow port with the second radial flow port when the spool member is in a first switching position; when the spool member is rotated to a second switching position, the first flow passage communicates the first axial flow passage port with the second radial flow passage port, and the second flow passage communicates the second axial flow passage port with the first radial flow passage port.

2. The rotary reversing valve of claim 1, wherein the first flow passage of the spool member includes a first axial valve bore, a first radial valve bore, and a second radial valve bore extending therethrough, the first axial valve bore being normally open to the first axial flow passage port; the second flow channel of the valve core component comprises a second axial valve hole, a third radial valve hole and a fourth radial valve hole which are communicated with each other, and the second axial valve hole and the second axial flow path port are normally communicated.

3. The rotary reversing valve of claim 2, wherein if the rotational angle at which the spool member is rotated from the first shift position to the second shift position is set to Q, and the plane defined by the axis of the first radial valve bore and the axis of the second radial valve bore is a first cross-section (Z1) perpendicular to the direction of the axis of the spool member, then the angle between the axis of the first radial valve bore and the axis of the second radial valve bore is Q; and a plane defined by the axis of the third radial valve hole and the axis of the fourth radial valve hole is a second cross section (Z2) perpendicular to the axial direction of the valve core component, and the included angle between the axis of the third radial valve hole and the axis of the fourth radial valve hole is Q.

4. The rotary reversing valve of claim 3, wherein the first cross section (Z1) and the second cross section (Z2) coincide to form a cross section (Z), and the first, second, third, and fourth radial valve bores are symmetrically disposed about the coincident cross section (Z).

5. The rotary type switching valve according to claim 2, wherein the valve core member includes a cylindrical switching portion and a connecting tube portion axially extending from both ends of the switching portion and having a reduced outer diameter, the first, second, third and fourth radial valve holes are provided in the switching portion, and the first and second axial valve holes are respectively provided in the connecting tube portion.

6. The rotary reversing valve according to claim 5, wherein the outer end portion of the connecting tube portion has a stepped portion with a reduced outer diameter, the upper and lower end cap portions are respectively provided with a groove, and a bearing is provided between the stepped portion and the groove.

7. The rotary reversing valve of any of claims 2 through 6, wherein the first radial valve bore, the second radial valve bore, the third radial valve bore, and the fourth radial valve bore are approximately equal in diameter.

8. The reversing valve of claim 7, wherein the first radial valve bore, the second radial valve bore, the third radial valve bore, the fourth radial valve bore, the first axial valve bore, and the second axial valve bore are approximately equal in diameter.

9. The rotary reversing valve of claim 8, wherein the first axial valve bore and the first radial valve bore and the first axial valve bore and the second radial valve bore communicate through arcuate flow passages; and the second axial valve hole is communicated with the third radial valve hole and the second axial valve hole is communicated with the fourth radial valve hole through an arc-shaped flow passage.

10. The rotary reversing valve of any one of claims 1 to 6, wherein when the spool member is in the first switching position, the flow areas of the first flow passages in the direction of fluid flow are substantially equal, and the flow areas of the second flow passages in the direction of fluid flow are substantially equal; when the spool member is in the second switching position, the flow areas of the first flow passages in the fluid flow direction are substantially equal, and the flow areas of the second flow passages in the fluid flow direction are substantially equal.

11. The rotary reversing valve of claim 10, wherein a flow area of each of the flow passages in the direction of fluid flow when the spool member is in the first switching position is substantially equal to a flow area of each of the flow passages in the direction of fluid flow when the spool member is in the second switching position.

12. A refrigeration system comprising a compressor, a first heat exchanger, a second heat exchanger, and a rotary reversing valve as recited in any one of claims 1-9, wherein said first axial flow port communicates with an inlet end of said compressor and said second axial flow port communicates with an outlet end of said compressor.

13. A refrigeration system comprising a compressor, a first heat exchanger, a second heat exchanger, and a rotary reversing valve as recited in any one of claims 1-9, wherein said first radial flow path port is in communication with an inlet end of said compressor, and said second radial flow path port is in communication with an outlet end of said compressor.