CN109424765B

CN109424765B - Rotary reversing valve

Info

Publication number: CN109424765B
Application number: CN201710747463.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Refrigeration Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2017-08-28
Filing date: 2017-08-28
Publication date: 2020-02-11
Anticipated expiration: 2037-08-28
Also published as: CN109424765A

Abstract

The invention discloses a rotary reversing valve, which comprises a valve core part, wherein the valve core part comprises a valve core, the valve core comprises a first flow channel and a second flow channel, the first flow channel comprises two first valve port parts, the two first valve port parts are positioned on the peripheral outer edge part of the valve core, the second flow channel comprises two second valve port parts, and the two second valve port parts are positioned on the peripheral outer edge part of the valve core; the valve body component comprises a valve cavity hole, and a plurality of flow path ports are formed in the inner wall of the valve cavity hole; the rotary reversing valve disclosed by the invention can ensure that all fluids in the system have open circulation channels in the reversing process, and cannot generate instant high pressure.

Description

Rotary reversing valve

Technical Field

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

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.

Fig. 1 is a schematic structural diagram of a rotary reversing valve used in a refrigeration system in the background art. As shown in fig. 1. The refrigeration system comprises a compressor 200, a first heat exchanger 300, a rotary reversing valve 100, a throttling element 500 and a second heat exchanger 400 which are communicated through pipelines. The rotary reversing valve 100 adopts a cylindrical valve core to rotate in the inner cavity of the valve body to switch flow paths, so that the valve core forms two independent flow channels, and in order to ensure that the two flow channels are independent from each other and fluid media are not communicated, the fit clearance between the valve core and the valve body of the product in the background art is designed to be small. In the product reversing process, when the valve core rotates to the middle position between the first switching position and the second switching position, two flow channels in the valve core are staggered with flow channel ports on the valve body, namely, the two flow channels are not communicated with the flow channel ports, and the valve core entity blocks the flow channel ports, so that fluid in a system cannot flow, the pressure of the system rises rapidly, and components in the system are damaged.

Therefore, the improvement of the structure of the rotary reversing valve to avoid the instant blocking of the product in the product reversing process of the flow path system is a technical problem to be considered by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a rotary reversing valve, comprising:

a valve element part including a valve element, the valve element including a first flow passage and a second flow passage, the first flow passage including two first port portions located at a circumferential outer edge portion of the valve element, the second flow passage including two second port portions located at a circumferential outer edge portion of the valve element; the valve body component comprises a valve cavity hole, the inner wall of the valve cavity hole is matched with the circumferential outer edge part of the valve core so that the valve core can rotate in the valve cavity hole, the inner wall of the valve cavity hole is provided with a plurality of flow path ports, and the flow path ports comprise a first flow path port, a second flow path port, a third flow path port and a fourth flow path port; the driving component is provided with a driving shaft in transmission connection with the valve core component; when the valve core is located at a first switching position, the two first valve port parts are respectively opposite to the first port and the second port, and the two second valve port parts are respectively opposite to the third port and the fourth port; when the valve core rotates to a second switching position, the two first valve port parts are respectively opposite to the first port and the third port, and the two second valve port parts are respectively opposite to the second port and the fourth port; when the valve core rotates to the middle position between the first switching position and the second switching position, the first flow passage and the second flow passage are respectively communicated with the flow passage port through the flow guide passage.

According to the rotary reversing valve provided by the invention, through the structural improvement design, when the valve core rotates to the middle position between the first switching position and the second switching position, the first flow channel and the second flow channel are respectively communicated with the flow channel port through the flow guide channel, so that open flow channels of system fluids in the reversing process are ensured, and instantaneous high pressure cannot be generated.

Meanwhile, the invention also provides a rotary reversing valve which comprises a valve core part, wherein the valve core part comprises a valve core with a first flow channel and a second flow channel, the first flow channel forms two first valve port parts at the peripheral edge part of the valve core, and the second flow channel forms two second valve port parts at the peripheral edge part of the valve core; the valve body component comprises a valve cavity hole, the valve cavity hole is matched with the valve core so that the valve core can rotate in the valve cavity hole, the inner wall of the valve cavity hole is provided with a flow path port, and the flow path port comprises a first flow path port, a second flow path port, a third flow path port and a fourth flow path port; the driving component is provided with a driving shaft in transmission connection with the valve core component;

when the valve core is positioned at a first switching position, the two first valve port parts are respectively opposite to the first port and the second port, and the two second valve port parts are respectively opposite to the third port and the fourth port; when the valve core rotates to a second switching position, the two first valve port parts are respectively opposite to the first port and the third port, and the two second valve port parts are respectively opposite to the second port and the fourth port; when the valve core rotates to a position where neither the first valve port portion nor the second valve port portion is opposite to the flow path port, the first flow passage and the second flow passage are respectively communicated with the corresponding flow path port through the flow guide passage.

According to the rotary reversing valve provided by the invention, through the structural improvement design, when the valve core rotates to the position where neither the first valve port part nor the second valve port part is opposite to the flow path port, the first flow channel and the second flow channel are respectively communicated with the corresponding flow path port through the flow guide channel, so that open circulation channels are ensured to be arranged for system fluids in the reversing process.

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 structure of the rotary reversing valve in the refrigeration system in the prior art is schematic;

FIG. 2: the invention provides a structural schematic diagram of a rotary reversing valve;

FIG. 3: FIG. 2 is a front perspective view of a spool member of the rotary reversing valve;

FIG. 4: FIG. 2 is a side perspective view of a spool member of the rotary reversing valve;

FIG. 5: FIG. 4 is a schematic structural view in transverse section of the valve core member in the direction A-A;

FIG. 6: FIG. 5 is an enlarged schematic view of the configuration of the core member in region I;

FIG. 7: FIG. 2 is a schematic view of the flow path status of the rotary reversing valve in a first switching position;

FIG. 8: FIG. 2 is a schematic illustration of the flow path state of the rotary reversing valve in a second switch position;

FIG. 9: FIG. 2 is a schematic view of the flow path state of the rotary reversing valve in the neutral position;

FIG. 10 is a schematic view of another rotary reversing valve according to the present invention;

FIG. 11: the invention provides a schematic diagram of the flow path state of another rotary reversing valve at the middle position;

FIG. 12 is a schematic view of a sealing member according to the present invention;

FIG. 13 is a schematic view of an elastic member according to the present invention;

FIG. 14: the invention provides another valve core component with a schematic structure in a transverse section. Number designations in FIGS. 1-14 indicate:

100-rotary reversing valve, 200-compressor;

300-first heat exchanger, 400-first heat exchanger, 500-throttling element;

1-spool part, 11-spool, 111-circumferential outer rim;

12/12A-first flow path, 13/13A-second flow path;

14/14A-first valve port section, 15/15A-second valve port section;

16-axial through groove, 161-step part and 162-arc surface of bottom wall;

163-receiving, 164-connecting;

2-valve body part, 21-valve body;

22-valve bore;

221-upper chamber, 222-lower chamber, 223-valve chamber inner peripheral wall;

23-a flow path port;

231-first flow path port, 232-second flow path port;

233-third flow path port, 234-fourth flow path port;

24-upper end cover, 25-lower end cover;

3-a drive member;

31-a cover body, 32-an inner cavity, 33-a driving motor and 34-a swing cylinder;

331/341-drive shaft, 35-limiting member;

4/4A-diversion channel;

41-a first flow guide channel, 42-a second flow guide channel;

5-an axial sealing member;

51-sealing member/seal strip, 52-elastic member/rubber;

511-metal insert, 512-step;

6-circumferential sealing member;

7-upper bearing seat, 8-lower bearing seat and 9-bearing.

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. 2 is a schematic structural view of a rotary reversing valve according to the present invention, fig. 3 is a schematic front perspective view of a valve core component of the rotary reversing valve in fig. 2, fig. 4 is a schematic side perspective view of the valve core component of the rotary reversing valve in fig. 2, fig. 5 is a schematic sectional structural view of the valve core component in fig. 4 in a direction a-a, and fig. 6 is an enlarged schematic structural view of the valve core component in a region I in fig. 5.

As shown in fig. 2, 3, 4, 5 and 6. In this embodiment, the rotary type direction valve 100 includes a spool member 1, a valve body member 2, and a driving member 3.

The spool member 1 includes a spool 11, the spool 11 is substantially a cylindrical structure rotatable about a central axis, and two through grooves intersecting with a circumferential outer edge 111 are formed in the body of the spool as a first flow passage 12 and a second flow passage 13. The two ports of the first flow passage 12 intersect with the circumferential outer edge portion 111 to form two first valve port portions 14; the two ports of the second flow passage 13 intersect the circumferential outer edge portion 111 to form two second valve port portions 15. A groove is formed in the first valve opening 14 along the circumferential outer edge 111 in an extending manner to form a first flow guide channel 41; a groove is provided in the second valve port portion 15 so as to extend along the circumferential outer edge portion 111, and a second guide passage 42 is formed. In the present embodiment, the first guide passage 41 is provided symmetrically with respect to both sides of the first valve port portion 14 on the circumferential outer edge portion 111; the second guide passage 42 is symmetrically disposed on the circumferential outer edge 111 with respect to both sides of the second valve port 15, and this design makes the fluid flow pressure uniform. Of course, other asymmetrical structures can be adopted, or only one valve opening part of the flow passage is provided with the flow guide channel.

In order to maintain the sealing between the first flow path 12 and the second flow path 13 in the stable state at the first switching position and the second switching position, the axial seal member 5 is provided at a position where the first guide passage and the second guide passage are opposed to each other on the circumferential outer edge portion 111 of the valve body 11 (the "opposed position" referred to herein means the first guide passage and the second guide passage which are close to each other). The axial seal part 5 includes a seal member 51 and an elastic member 52.

Specifically, in the present embodiment, an axial through groove 16 that penetrates in the axial direction is formed in the circumferential outer edge portion 111 of the valve body 11 at an intermediate position corresponding to the first guide passage 41 and the second guide passage 42. In cross-section, the axial through slots 16 are generally "T" shaped structures that taper in the direction of the slot opening to a narrower slot bottom. The inner wider area is the receiving portion 163, and the area where the receiving portion 163 extends toward the notch throat is the connecting portion 164.

Fig. 12 is a schematic view of a sealing member according to an embodiment of the present invention, and fig. 13 is a schematic view of an elastic member according to an embodiment of the present invention.

As shown in fig. 12 and 13 and with reference to fig. 6. In the present embodiment, the sealing member 51 is embodied as a sealing strip, and the sealing strip 51 is substantially of a "T" shape in the cross-sectional direction and corresponds to the cross-section of the axial through slot 16 of the valve core 11. The sealing strip 51 is placed in the housing 163 of the axial through slot 16, the "T" shaped front end of the sealing strip 51 protruding through the connecting portion 164 out of the notch of the axial through slot 16. To further increase the rigidity, the sealing strip 51 is provided with a metal insert 511 extending axially therethrough, although inserts of other materials may be used, the insert having a rigidity greater than that of the sealing strip 51.

Other similar structures may be used for the sealing member, such as sealing strips with trapezoidal or rectangular cross-sections. Since the receiving groove of the valve element 11 is the axial through groove 16, the sealing strip 51 can be easily inserted and placed from the upper end or the lower end of the through groove 16, and the elastic member 52 mentioned below is also the same, and will not be described in detail.

In the present embodiment, in order to provide the sealing member 51 with better rigidity, a non-metal engineering plastic material is generally adopted to satisfy certain rigidity and certain strength and wear resistance, and a metal material with softer hardness, such as a metallic copper or aluminum material, may be selected.

An elastic member 52 is also provided in the accommodating portion 163 of the axial through groove 16, and in this embodiment, the elastic member 52 is embodied as a long strip-shaped rubber piece having a circular cross-sectional profile. The elastic member 52 presses the sealing member 51 in the notch direction. In this way, after the valve body 11 is attached to the valve chamber hole 22, the sealing member 51 is held in contact with the inner peripheral wall 223 of the valve chamber hole 22, and the first channel 12 and the second channel 13 can be kept airtight.

Considering the working environment of the rotary reversing valve, some impurities are inevitable in the system, although some impurity filtering components are arranged in the system, the particles filtered by the components are generally above 120 meshes, namely the particles with the diameter of about 0.12mm and below can not be filtered, so that the relationship between the inner diameter size (D1) of the valve cavity hole and the outer diameter size (D2) of the circumferential outer edge of the valve core is satisfied in order to prevent the valve core and the valve body from being stuck: D2-D1 is more than or equal to 0.24 mm.

When the valve core is located at the first switching position or the first switching position, the sealing member 51 is abutted against the inner peripheral wall 223 of the valve cavity hole, and the distance (H) of the sealing member protruding out of the peripheral edge part is more than or equal to 0.12 mm.

The rotary reversing valve structure can be compatible with impurities below 120 meshes without being blocked.

In the present embodiment, in order to provide the elastic member 52 with better elasticity, a rubber strip with a circular cross-sectional profile is preferably used, and the bottom wall of the axial through groove 16 of the valve core 11 also has an arc surface 162 corresponding to the elastic member 52 in the cross-sectional direction. The elastic member 52 (rubber strip) can be deformed uniformly without surface damage after being pressed, and the service life is prolonged. Of course, the elastic member may also have other similar structures as long as the cross-sectional profile includes at least one segment of circular arc, such as a sealing strip with a semicircular or elliptical cross-section.

The matching structure of the sealing component 51 and the elastic component 52 has the advantages that: a sealing component 51 and an elastic component 52 are arranged in an axial through groove 16 arranged along the axial direction between the two flow passages to form a double-sealing structure, wherein the sealing component is made of materials with better rigidity and hardness, such as PPS (polyphenylene sulfide), PEEK (polyether-ether-ketone), and metals such as red copper, aluminum and the like; the elastic component is made of soft materials with good elasticity, such as rubber, and the elastic deformation of the materials is utilized to make up the fit clearance by a certain compression amount, so that the sealing reliability is ensured. And a proper gap can be formed between the valve body and the valve core, so that the clamping result can not be caused.

Further, when the valve body member 1 is rotated to the intermediate position (described later), the first flow passage and the second flow passage do not directly communicate with the flow passage port, and the seal member 51 faces one of the flow passage ports 23, and the portion of the seal member 51 protruding from the circumferential outer edge portion 111 is not restrained by abutment with the valve chamber inner peripheral wall 223. In the process of continuously rotating the valve core 11, the valve core is easily extruded and deformed or even sheared under the action of a fluid medium, and the sealing structure is damaged. But since the axial through-groove 16 of the spool 11 includes the receiving portion 163 and the connecting portion 164 extending from the receiving portion 163 toward the notch throat. The step 161 formed between the receiving portion 163 and the connecting portion 164 can effectively prevent the sealing member 51 from being separated from the axial through slot 16 by pressure.

In consideration of further reliability of sealing between the spool member 1 and the valve chamber hole 22, the circumferential seal members 6 may be provided at positions near the upper end and near the lower end of the circumferential outer edge portion 111 of the spool 11, respectively.

The valve body member 2 includes a valve body 21, an upper end cap 24, and a lower end cap 25. In a large-sized directional control valve, the valve body 21 is generally formed by metal casting, a cylindrical hole is formed in the middle of the valve body as the valve chamber hole 22, and the inner peripheral wall 223 of the valve chamber hole 22 is matched with the outer peripheral edge 111 of the cylindrical valve core 11, so that the valve core 11 can rotate in the valve chamber hole 22. The upper end cap 24 and the lower end cap 25 are fixed to the valve body 21.

The upper end cover 24 is provided with an upper bearing seat 7, and the lower end cover 25 is provided with a lower bearing seat 8. A step shaft extending upward from the upper end of the valve body 11 and having a reduced diameter, and an upper bearing 9 fixed to the step shaft; a step shaft extending downward from the lower end of the valve body 11 and having a reduced diameter, and a lower bearing 9 fixed to the step shaft. The spool member 1 is supported in the valve chamber hole 22 and is rotatable in the valve chamber hole 22 by the upper bearing housing 7 and the lower bearing housing 8 being fitted with the upper/lower bearings 9, respectively.

In the present embodiment, the upper bearing seat 7 and the upper end cap 24, and the lower bearing seat 8 and the lower end cap 25 are integrated, or the bearing seats may be fixed to the end caps as inserts.

An upper chamber 221 is formed between the upper end of the valve body 11 and the upper end cap 24, and a lower chamber 222 is formed between the lower end of the valve body 11 and the lower end cap 25.

The first flow path port may be a high-pressure inlet port, and preferably, the upper chamber 221 and the lower chamber 222 are communicated with a high-pressure chamber of the first flow path port (specifically, may be communicated through an additional connection pipe or directly communicated through an opening on the valve body). The upper chamber 221 and the lower chamber 222 are sealed from the external environment. Therefore, the upper part and the lower part of the valve core 11 are under the action of high pressure, and the fluctuation of pressure change in the reversing rotation process is small.

Four connecting pipes are welded on the valve body 21, and an inner cavity at one end of each connecting pipe is hermetically communicated with the valve cavity hole 22 to form four flow path ports 23, specifically including a first flow path port 231, a second flow path port 232, a third flow path port 233 and a fourth flow path port 234. The other end of the connecting pipe is welded with a flange plate which is convenient for being connected with a heat pump system. (four connecting pipes and flanges can also be directly cast on the valve body, thereby improving the reliability of the product and reducing the cost.)

The driving part 3 comprises a cover 31, the cover 31 is fixed on the upper end cover 24, and an inner cavity 32 communicated with the upper cavity 221 is formed in the cover 31. A driving motor 33 is disposed in the housing 31, and a driving shaft 331 of the driving motor 33 extends into the upper chamber 221 and drives the valve core 11 to rotate.

Referring to fig. 7, when the drive shaft 331 of the drive motor 33 rotates the valve body 11 to the first switching position with respect to the valve body 2, the first valve port portions 14 at both ends of the first flow passage 12 directly communicate with the first flow passage port 231 and the second flow passage port 232, respectively; the second port portions 15 at both ends of the second flow passage 13 directly communicate with the third flow passage port 233 and the fourth flow passage port 234, respectively.

Referring to fig. 8, when the driving shaft 331 of the driving motor 33 rotates the valve body 11 to the second switching position with respect to the valve body 2, the first valve port portions 14 at both ends of the first flow passage 12 are directly communicated with the first flow passage port 231 and the third flow passage port 233, respectively; the second port portions 15 at both ends of the second flow passage 13 directly communicate with the second flow passage port 232 and the fourth flow passage port 234, respectively.

Referring to fig. 9, when the valve body member 2 is rotated by the driving shaft 331 of the driving motor 33 to an intermediate position (defined as the valve body is rotated to an intermediate position between the first switching position and the second switching position where neither the first flow passage nor the second flow passage is directly communicated with the flow passage port, as embodied in fig. 9, the first valve port portion 14 of the valve body 11 rotated to the first flow passage 12 is opposed to the valve chamber inner peripheral wall 223 without being directly communicated with any one of the flow passage ports 23, and the second valve port portion 15 of the second flow passage 13 is opposed to the valve chamber inner peripheral wall 223 without being directly communicated with any one of the flow passage ports 23). At this time, the fluid in the first flow path port 231, the second flow path port 232, the third flow path port 233 and the fourth flow path port 234 can be communicated with the first flow path 12 and the second flow path 13 through the flow guide passages 4 (the first flow guide passage 41 and the second flow guide passage 42), so that the system flow passage is not blocked and an instantaneous high pressure is not generated during the reversing process.

In the above embodiment, the guide passage 4 is provided on the circumferential outer edge portion 111 symmetrically grooved with respect to both sides of the valve port portion. Of course, the flow guide passage may be provided only on one side of the circumferential outer edge 111 with respect to the valve port. As long as the system fluid has an open flow channel during the reversing process, the beneficial effects of the above embodiment can be achieved, and are not described herein again.

FIG. 11 is a schematic view of the flow path status of another rotary reversing valve of the present invention in an intermediate position.

As shown in fig. 11. In the present embodiment, the flow guide passage 4A is provided on the valve chamber inner peripheral wall 223 of the valve body member 1, and the flow guide passage 4A is specifically provided as a groove extending from the flow path port 23 along the circumferential direction of the valve chamber inner peripheral wall 223. When the valve element member rotates from the first switching position to the intermediate position in the process of the second switching position, the fluid in the first flow path port 231, the second flow path port 232, the third flow path port 233, and the fourth flow path port 234 may still be communicated with the first flow path 12 and the second flow path 13 through the flow guide channels 4A, which is not described herein again.

Fig. 14 is a schematic structural view of another spool component in a transverse section according to the invention.

As shown in fig. 14. Unlike the foregoing embodiment, in the present embodiment, two through grooves that meet the circumferential outer edge portion 111 are machined in the valve body 11 as the first flow passage 12A and the second flow passage 13A. The first flow passage 12A intersects with both ends of the circumferential outer edge portion 111 to form two first valve port portions 14A; two ports of the second flow passage 13A intersect with the circumferential outer edge portion 111 to form two second valve port portions 15A. The two first valve port parts 14A are communicated with each other, so that the two ends of the first flow passage 12A are communicated together; the two second port portions 15A are communicated with each other, so that both ends of the second flow passage 13A are communicated with each other.

Fig. 10 is a schematic structural view of another rotary reversing valve according to the present invention.

As shown in fig. 10. Unlike the foregoing embodiment, in the present embodiment, the driving part 3 employs the swing cylinder 34 instead of the driving motor 33. The swing cylinder 34 is fixed on the upper end cover 24, a driving shaft 341 of the swing cylinder 34 extends into the upper chamber 221 and can drive the valve core 11 to rotate, and meanwhile, a limiting component 35 (see fig. 3) is also arranged on the upper end cover 24, and the limiting component 35 is specifically a fixed block. The driving shaft 341 of the swing cylinder 34 abuts against the fixed block to limit the rotational stroke of the driving shaft during the rotation of the driving spool 11.

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:

the valve core component comprises a valve core, the valve core comprises a first flow channel and a second flow channel, the first flow channel comprises two first valve port parts, and the two first valve port parts are positioned on the peripheral outer edge part of the valve core; the second flow passage includes two second port portions located at a circumferential outer edge portion of the spool;

the valve body component comprises a valve cavity hole, the inner wall of the valve cavity hole is matched with the circumferential outer edge part of the valve core so that the valve core can rotate in the valve cavity hole, the inner wall of the valve cavity hole is provided with a plurality of flow path ports, and the flow path ports comprise a first flow path port, a second flow path port, a third flow path port and a fourth flow path port;

the driving component is provided with a driving shaft in transmission connection with the valve core component;

a flow guide passage provided between the first flow passage and the flow passage port, and between the second flow passage and the flow passage port,

when the spool is located at a first switching position, the two first port portions are opposed to the first flow path port and the second flow path port, respectively, and the two second port portions are opposed to the third flow path port and the fourth flow path port, respectively;

when the spool rotates to a second switching position, the two first port portions are opposed to the first flow path port and the third flow path port, respectively, and the two second port portions are opposed to the second flow path port and the fourth flow path port, respectively;

when the valve core rotates to the middle position between the first switching position and the second switching position, the first flow passage and the second flow passage are respectively communicated with the flow passage port through the flow guide passage.

2. The rotary reversing valve of claim 1, wherein the flow directing passage comprises a first flow directing passage and a second flow directing passage, the first flow directing passage comprising a slot extending from the first valve port portion along the circumferential outer edge portion; the second guide passage includes a groove extending from the second valve port portion along the circumferential outer edge portion.

3. The rotary reversing valve of claim 2, wherein the first flow directing passage is symmetrically disposed about both sides of the first valve port portion at the circumferential outer edge portion; the second guide passages are symmetrically arranged on the circumferential outer edge part relative to two sides of the second valve opening part.

4. The rotary reversing valve of claim 3, wherein an axial seal member is disposed at the circumferentially outer edge portion of the first flow directing passage opposite the second flow directing passage.

5. The rotary reversing valve of claim 4, wherein a circumferential seal member is provided at each of a position near an upper end portion and a position near a lower end portion of the circumferential outer rim portion.

6. The rotary reversing valve of claim 4, wherein the axial sealing member comprises an elastic member disposed in the receiving groove of the spool and a sealing member disposed in the receiving groove of the spool and partially protruding from the circumferential outer edge portion, the elastic member biases the sealing member, and a relationship is satisfied between an inner diameter dimension D1 of the valve chamber hole and an outer diameter dimension D2 of the circumferential outer edge of the spool: D1-D2 is more than or equal to 0.24 mm.

7. The rotary reversing valve of claim 4, wherein the axial sealing member comprises an elastic member disposed in the receiving groove of the spool and a sealing member disposed in the receiving groove of the spool and partially protruding from the circumferential outer edge portion, the elastic member biases the sealing member, the sealing member abuts against an inner wall of the valve chamber hole when the spool is located at the first switching position or the second switching position, and a distance H of the sealing member protruding from the circumferential outer edge portion is greater than or equal to 0.12 mm.

8. The rotary reversing valve of claim 1, wherein the flow guide channel is disposed on an inner peripheral wall of the valve bore, the flow guide channel comprising a slot extending from the flow path port in a circumferential direction of the inner peripheral wall.

9. The rotary reversing valve according to any one of claims 1 to 8, wherein the valve body member comprises a valve body, an upper end cap and a lower end cap, the upper end cap is provided with an upper bearing seat, the lower end cap is provided with a lower bearing seat, the valve core member is supported on the upper bearing seat and the lower bearing seat through bearings, an upper chamber is formed between the upper end portion of the valve core and the upper end cap, and a lower chamber is formed between the lower end portion of the valve core and the lower end cap.

10. The rotary reversing valve of claim 9, wherein the first flow path port is a high pressure inlet port, and the upper and lower chambers communicate with the first flow path port.

11. The rotary reversing valve according to claim 9, wherein the drive member comprises a housing and a drive motor disposed in an interior of the housing, the housing is fixedly connected to the upper end cap, a drive shaft of the drive motor extends into the upper chamber and is drivingly connected to the spool member, and the interior of the housing is in communication with the upper chamber.

12. The rotary reversing valve according to claim 9, wherein the drive member comprises a swing cylinder, the swing cylinder is fixedly connected to the upper end cap, a drive shaft of the swing cylinder extends into the upper chamber and is in driving connection with the valve core member, and the upper end cap is provided with a limiting member capable of limiting a rotational stroke of the drive shaft.