CN108253157B

CN108253157B - Expansion switch valve

Info

Publication number: CN108253157B
Application number: CN201611249725.XA
Authority: CN
Inventors: 谭廷帅; 黄健; 陈雪峰; 叶梅娇
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2020-05-22
Anticipated expiration: 2036-12-29
Also published as: CN108253157A; WO2018121412A1

Abstract

The utility model provides an expansion switch valve, including the valve body, be formed with the import on this valve body, export and the inside flow path of intercommunication between import and export, install a case and have first runner and the second runner that communicates with the export respectively on the inside flow path, be formed with the orifice on the second runner, the case is along axial reciprocating motion in order to have first operating position and second operating position, at first operating position, the case ends the second runner and makes import and export direct intercommunication, at second operating position, the case ends the first runner and makes the import pass through the orifice intercommunication. By switching the first working position and the second working position of the valve core, the direct communication control or throttling expansion control function of the refrigerant can be realized, the structure is simple, and the production and the installation are easy; when the expansion switch valve provided by the disclosure is applied to a heat pump system, the pipeline connection can be simplified, the cost is reduced, the refrigerant charge of the whole heat pump system is reduced, and the oil return of a compressor is facilitated.

Description

Expansion switch valve

Technical Field

The disclosure relates to the field of control valves, in particular to an expansion switch valve.

Background

In a heat pump system, sometimes, the throttling and pressure reduction of refrigerant are controlled or only the refrigerant passes through the heat pump system without throttling, while the existing electronic expansion valve only controls the throttling or not passing of the refrigerant. In order to meet the requirement of the heat pump system, a structure that an electronic expansion valve and an electromagnetic switch valve are connected in parallel is used in the prior art. The structure needs two tee joints and six pipelines, and is complex and inconvenient to install. When the electromagnetic valve is closed and the electronic expansion valve is used, the inlet of the electronic expansion valve is a medium-temperature high-pressure liquid refrigerant, the outlet of the electronic expansion valve is a low-temperature low-pressure liquid refrigerant, and because the pipelines are communicated, the inlet and the outlet of the electromagnetic valve are respectively consistent with the states of the refrigerants at the inlet and the outlet of the electronic expansion valve, and the pressures and the temperatures of the refrigerants at the inlet and the outlet of the electromagnetic valve are different, so that the internal structure of the electromagnetic. In addition, because the number of pipelines is large, the refrigerant charge of the whole heat pump system can be increased, and the cost is increased. When the heat pump system works at low temperature, oil return of the compressor is difficult, and the complex structure is also not beneficial to oil return of the heat pump system.

Disclosure of Invention

The expansion switch valve can realize on-off control and throttling control of media flowing through and is simple in structure.

In order to achieve the above object, the present disclosure provides an expansion switching valve including a valve body, wherein an inlet, an outlet, and an internal flow passage communicating between the inlet and the outlet are formed in the valve body, the internal flow passage is provided with a spool and has a first flow passage and a second flow passage respectively communicating with the outlet, the second flow passage is provided with an orifice, the spool is capable of axially reciprocating to have a first operating position in which the spool blocks the second flow passage so that the inlet and the outlet are directly communicated, and a second operating position in which the spool blocks the first flow passage so that the inlet is communicated through the orifice.

Optionally, the internal flow passage includes a slide rail for the valve element to slide, the slide rail is communicated with the inlet through a third flow passage, the slide rail is communicated with the outlet through the first flow passage and the second flow passage, respectively, and the valve element selectively blocks the first flow passage and the second flow passage.

Optionally, the bottom end pad of the slide is provided with a buffer spring.

Alternatively, the third flow passage is located between the first flow passage and the second flow passage in the axial moving direction of the spool.

Optionally, the chute opens vertically downward on the valve body.

Optionally, the first runner, the second runner, and the third runner are all disposed perpendicular to the slide way.

Alternatively, the first flow passage and the third flow passage are respectively formed as a first through hole and a second through hole opened in a side wall of the slide, and the second flow passage is formed as the throttle hole opened in the side wall of the slide.

Optionally, the valve body includes a valve seat forming the internal flow passage, a magnetic valve rod is mounted on the valve seat, and an electromagnetic driving portion is mounted between the magnetic valve rod and the valve seat to drive the valve core to reciprocate in the axial direction through the magnetic valve rod.

Optionally, a limit portion is formed between the magnetic valve stem and the valve seat to limit movement of the magnetic valve stem when the electromagnetic drive portion acts on the magnetic valve stem.

Optionally, the stopper portion includes a stopper stepped groove formed on the valve seat, and a stopper flange formed on an end of the magnetic valve stem, the stopper flange being inserted into the stopper stepped groove in a form-fitting manner.

Optionally, an avoidance groove is formed on an end surface of the magnetic valve rod for avoiding the valve core.

Alternatively, the valve seat is formed in a polyhedral structure, and the magnetic valve stem, the inlet and the outlet are respectively disposed on different surfaces of the polyhedral structure, wherein the inlet and the outlet are opened in parallel to each other on opposite sides of the valve body, and the magnetic valve stem mounting direction is respectively perpendicular to the inlet and the outlet.

Through the technical scheme, the valve core is arranged on the internal flow channel of the same valve body, and the first working position and the second working position of the valve core are switched, so that the direct communication control or throttling expansion control function of the refrigerant can be realized, and the valve core is simple in structure and easy to produce and install; in addition, when the expansion switch valve provided by the disclosure is applied to a heat pump system, the pipeline connection can be simplified, the cost is reduced, the refrigerant charge of the whole heat pump system is reduced, and the oil return of the compressor is facilitated.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic perspective view of an expansion switching valve provided according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of an expansion switch valve provided in accordance with an exemplary embodiment of the present disclosure, wherein a first flow passage is in a conducting state and a second flow passage is in a blocking state;

FIG. 3 is a schematic cross-sectional view of an expansion switch valve provided in accordance with an exemplary embodiment of the present disclosure, wherein the second flow passage is in a conducting state and the first flow passage is in a blocking state;

fig. 4 is an internal structural view of an expansion switching valve provided in accordance with an exemplary embodiment of the present disclosure, in which a first flow passage is in a turned-on state and a second flow passage is in a turned-off state;

fig. 5 is an internal structural view of an expansion switching valve provided in accordance with an exemplary embodiment of the present disclosure, in which a second flow passage is in a turned-on state and a first flow passage is in a turned-off state.

Description of the reference numerals

500 inlet 502 outlet of valve body 501

503 spool 504 slide 505 second flow path

515 orifice 506 third flow passage 516 second through hole

507 first flow channel 517 first through hole 508 buffer spring

510 valve seat 511 magnetic valve stem 512 electromagnetic drive

513 limiting step groove 514 limiting flange 518 avoiding groove

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally refers to the directions of the drawing of the drawings, "upstream, and downstream" refer to the directions of flow of media, such as refrigerant, specifically, the direction of flow of refrigerant is downstream and the direction of flow of refrigerant away therefrom is upstream, and "inner and outer" refer to the inner and outer of the respective component profiles.

As shown in fig. 1 and 2, the present disclosure provides an expansion switching valve including a valve body 500, wherein the valve body 500 is formed with an inlet 501, an outlet 502, and an internal flow passage communicating between the inlet 501 and the outlet 502, the internal flow passage is mounted with a spool 503 having a first flow passage 507 and a second flow passage 505 respectively communicating with the outlet 502, the second flow passage 505 has an orifice 515, the spool 503 is axially reciprocally movable to have a first operating position and a second operating position, in the first operating position, the spool 503 blocks the second flow passage 505 so that the inlet 501 and the outlet 502 are directly communicated, and in the second operating position, the spool 503 blocks the first flow passage 507 so that the inlet 501 and the outlet 502 are communicated through the orifice 515.

In other words, the valve body 500 has a first flow passage 507 and a second flow passage 505 formed in the inner flow passage to communicate the inlet 501 and the outlet 502 in a branching manner, and a valve member 503 is mounted in the inner flow passage to communicate the inlet 501 and the outlet 502 directly or through the orifice 515.

The "direct communication" realized by the valve core 503 means that the coolant entering from the inlet 501 of the valve body 500 can pass through the valve core 503 and directly flow to the outlet 502 of the valve body 500 through the internal flow passage without being affected. The "through orifice communication" realized by the spool 503 means that the coolant entering from the inlet 501 of the valve body 500 can flow to the outlet 502 of the valve body 500 beyond the spool 503 through the throttling of the orifice 515.

In this way, the expansion switch valve of the present disclosure can allow the coolant entering from the inlet 501 to achieve two states by controlling the position of the spool 503, i.e., switching the first operating position and the second operating position of the spool 503. I.e., 1) a direct communication state across the spool 503; and 2) a throttle communication state across the second spool 503.

After being throttled by the throttle hole 515, the high-temperature and high-pressure liquid refrigerant can become low-temperature and low-pressure atomized hydraulic refrigerant, and conditions can be created for the evaporation of the refrigerant, namely the cross-sectional areas of the throttle hole 515 are all smaller than the cross-sectional areas of the inlet 501, the outlet 502 and the first flow channel 507. That is, the cooperation of the spool 503 and the valve body 500 may enable the expansion switching valve to function as an expansion valve.

Thus, a valve core 503 is installed on the internal flow passage of the same valve body 500, and the first working position and the second working position of the valve core 503 are switched to realize the direct communication control or throttling control function of the inlet 501 and the outlet 502, the structure is simple, and the production and the installation are easy; when the expansion switch valve provided by the disclosure is applied to a heat pump system, the refrigerant charge of the whole heat pump system can be reduced, the cost is reduced, the pipeline connection is simplified, and the oil return of the heat pump system is facilitated.

As an exemplary internal mounting structure of the valve body 500, as shown in fig. 1 to 5, the valve body 500 includes a valve seat 510 forming an internal flow passage, a magnetic stem 511 is mounted on the valve seat 510, and an electromagnetic driving part 512 is mounted between the magnetic stem 511 and the valve seat 510 to drive a valve core 503 to reciprocate in an axial direction by the magnetic stem 511.

Wherein, the valve core 503 can be conveniently controlled to switch the first working position and the second working position by controlling the on/off of the electromagnetic driving part 512, such as a solenoid, and further the inlet 501 and the outlet 502 are controlled to be directly communicated or communicated through the throttle 515. Specifically, when the electromagnetic driving portion 512 is powered on, the magnetic field of the magnetic stem 511 can be strengthened, so that the magnetic stem 511 can overcome the gravity of the valve core 503 to adsorb the valve core 503, the valve core 503 moves to the top of the slide channel 504 under the action of the magnetic force, and the valve core 503 blocks one of the first flow channel 507 and the second flow channel 505; when the electromagnetic driving portion 512 is powered off, the magnetic stem 511 has insufficient magnetic field to make the magnetic stem 511 absorb the valve core 503 against the gravity of the valve core 503, and the valve core 503 falls to the bottom of the slide channel 504 under the action of gravity, so that the valve core 503 blocks the other one of the first flow channel 507 and the second flow channel 505.

In other words, the electronic expansion valve and the electromagnetic valve, which share the inlet 501 and the outlet 502, are installed in parallel in the valve body 500, so that the automatic control of the on-off or throttling of the expansion switch valve can be realized, and the pipeline trend is simplified.

As shown in fig. 2 and 3, in order to prevent the magnetic stem 511 from moving under the action of electromagnetic force when the electromagnetic driving part 512 is energized, a stopper is formed between the magnetic stem 511 and the valve seat 510 to limit the movement of the magnetic stem 511 when the electromagnetic driving part 512 acts on the magnetic stem 511.

In order to facilitate the assembly of the magnetic valve stem 511 to the valve seat 510, the stopper portion includes a stopper stepped groove 513 formed on the valve seat 510, and a stopper flange 514 formed on an end of the magnetic valve stem 511, and the stopper flange 514 is inserted into the stopper stepped groove 513 in a form-fitting manner, as shown in fig. 2 and 3. In this way, the magnetic stem 511 can be easily mounted to the valve seat 510. In addition, as shown in fig. 2, when the electromagnetic driving portion 512 is energized, the magnetic valve stem 511 can be restrained from moving downward by the electromagnetic force due to the cooperation between the stopper flange 514 and the stopper groove 513.

Further, in order to facilitate the secure fitting of the magnetic valve stem 511 to the valve seat 510, the limit step groove 513 may be formed as a plurality of stages of limit step grooves connected in series, and the caliber of the notch of the multi-stage limit step groove is gradually reduced in the insertion direction of the magnetic valve stem 511, so as to facilitate the attachment and detachment of the magnetic valve stem 511.

To increase the moving stroke of the valve core 503 on the slide way 504 (described in detail below), as shown in fig. 2, an avoiding groove 518 is formed on the end surface of the magnetic valve stem 511 for avoiding the valve core 503. That is, after the magnetic stem 511 attracts the upper spool 503, a portion of the spool 503 may be received in the escape groove 518, so that the spool 503 prevents the spool 503 from blocking the third flow passage 506 while blocking the first flow passage 507 or the second flow passage 505 (described in detail below).

In order to fully utilize the spatial positions of the expansion switch valve in all directions and avoid the interference between the expansion switch valve and different pipelines, the valve seat 510 is formed in a polyhedral structure, the magnetic valve rod 511, the inlet 501 and the outlet 502 are respectively arranged on different surfaces of the polyhedral structure, wherein the inlet 501 and the outlet 502 are arranged on two opposite sides of the valve body 500 in parallel, and the installation direction of the magnetic valve rod 511 is perpendicular to the inlet 501 and the outlet 502 respectively. Like this, can be with import, outlet pipe way connection on polyhedral structure's different surfaces, can avoid the problem that the pipeline arrangement is in disorder, tangled.

As a typical internal structure of the electromagnetic expansion valve, as shown in fig. 2 to 5, the internal flow passage includes a slide passage 504 for sliding a valve element 503, the slide passage 504 communicates with the inlet 501 through a third flow passage 506, the slide passage 504 communicates with the outlet 502 through a first flow passage 507 and a second flow passage 505, respectively, and the valve element 503 selectively blocks the first flow passage 507 and the second flow passage 505.

That is, by shifting the position of the spool 503 within the slide 504 to selectively communicate the through-flow passage composed of the inlet 501, the third flow passage 506, the first flow passage 507, and the outlet 502 or the throttle passage composed of the inlet 501, the third flow passage 506, the second flow passage 505, and the outlet 502, the communication function of the solenoid valve and the throttle function of the electronic expansion valve described above can be realized.

To protect the valve core 503 and allow the length of the valve core 503 to be designed to be shorter, thereby increasing the moving stroke of the valve core 503, a cushion spring 508 is cushioned at the bottom end of the slide 504. Thus, when the electromagnetic driving portion 512 is switched from the conducting state to the power-off state, the valve core 503 can be prevented from directly colliding with the bottom of the slide 504 in the dropping process, and the service life of the valve core 503 is influenced; in addition, the buffer spring 508 also increases the height of the valve core 503 in the slide 504, and is more beneficial to blocking the second flow passage 505.

To ensure that the spool 503 can selectively block the second flow passage or the first flow passage, as shown in fig. 2, the third flow passage 506 is located between the first flow passage 507 and the second flow passage 505 in the axial moving direction of the spool 503.

The slide 504 may be disposed in any suitable manner in the valve body, and in order to prevent the valve core 503 from unnecessary friction and prolong the service life of the valve core 503, as shown in fig. 2 to 5, the slide 504 is vertically disposed downward on the valve body 500.

In order to minimize the total length of the inner flow passage and reduce the time for the refrigerant to flow through the inner flow passage, as shown in fig. 2 to 5, the first flow passage 507, the second flow passage 505, and the third flow passage 506 are disposed perpendicular to the slide 504. In this way, it can be ensured that the refrigerant flowing out of the third flow passage flows quickly to the second flow passage or the first flow passage.

For the sake of easy processing and simplification of the structure of the electromagnetic expansion valve, the first flow passage 507 and the third flow passage 506 are formed as a first through hole 517 and a second through hole 516, respectively, which are opened in the side wall of the slide 504, and the second flow passage 505 is formed as an orifice 515 which is opened in the side wall of the slide 504.

When the electromagnetic valve function of the expansion switch valve is required to be used, as shown in fig. 2 and 4, the magnetic driving part 512 is energized, the valve core 503 is attracted to the magnetic valve rod 511 and moves to the first operating position, the second flow passage 505 is closed, and the refrigerant flowing into the internal flow passage from the inlet 501 cannot pass through the orifice 515 at all but can flow into the outlet 502 through the second through hole 516, the slide 504 and the first through hole 517 in sequence.

Note that the dashed lines with arrows in fig. 2 and 4 represent the flow paths and the direction of the refrigerant when the solenoid valve function is used.

When only the electronic expansion valve function of the expansion switch valve is required, as shown in fig. 3 and 5, the magnetic driving unit 512 is de-energized, the valve body 503 is moved to the second operation position by disengaging from the magnetic valve stem 511, the first flow passage 507 is closed, and the refrigerant flowing from the inlet 501 into the internal flow passage cannot pass through the first through hole 517 but can flow into the outlet 502 by passing through the second through hole 516, the slide 504, and the orifice 515 in this order.

Note that the dashed lines with arrows in fig. 3 and 5 represent the flow paths and the direction of the refrigerant when the electronic expansion valve function is used.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An expansion switch valve, comprising a valve body (500), characterized in that the valve body (500) is formed with an inlet (501), an outlet (502) and an internal flow passage communicating between the inlet (501) and the outlet (502), a valve core (503) is arranged on the inner flow passage and is provided with a first flow passage (507) and a second flow passage (505) which are respectively communicated with the outlet (502), the second flow passage (505) is provided with an orifice (515), the valve core (503) can reciprocate along the axial direction to have a first working position and a second working position, in the first working position, the valve core (503) cuts off the second flow passage (505) so that the inlet (501) and the outlet (502) are directly communicated, in the second working position, the valve core (503) cuts off the first flow passage (507) so that the inlet (501) and the outlet (502) are communicated through the throttling hole (515).

2. The expansion switch valve according to claim 1, characterized in that the internal flow passage comprises a slide (504) for sliding the spool (503), the slide (504) communicating with the inlet (501) through a third flow passage (506), the slide (504) communicating with the outlet (502) through the first flow passage (507) and the second flow passage (505), respectively, the spool (503) selectively blocking the first flow passage (507) and the second flow passage (505).

3. The expansion switch valve according to claim 2, characterized in that the bottom end pad of the slide (504) is provided with a buffer spring (508).

4. The expansion switch valve according to claim 2, characterized in that the third flow passage (506) is located between the first flow passage (507) and the second flow passage (505) in the axial moving direction of the spool (503).

5. The expansion switch valve according to claim 2, characterized in that the slide (504) opens vertically downwards on the valve body (500).

6. The expansion switch valve according to claim 5, characterized in that the first flow channel (507), the second flow channel (505) and the third flow channel (506) are all arranged perpendicular to the slide (504).

7. The expansion switch valve according to any one of claims 2 to 6, characterized in that the first flow passage (507) and the third flow passage (506) are formed as a first through hole (517) and a second through hole (516) that open on a side wall of the slide (504), respectively, and the second flow passage (505) is formed as the throttle hole (515) that opens on a side wall of the slide (504).

8. The expansion switch valve according to claim 1, wherein the valve body (500) comprises a valve seat (510) forming the internal flow passage, a magnetic stem (511) is mounted on the valve seat (510), and an electromagnetic driving part (512) is mounted between the magnetic stem (511) and the valve seat (510) to drive the spool (503) to reciprocate in the axial direction through the magnetic stem (511).

9. The expansion switch valve according to claim 8, characterized in that a stopper is formed between the magnetic stem (511) and the valve seat (510) to limit the movement of the magnetic stem (511) when the electromagnetic driving part (512) acts on the magnetic stem (511).

10. The expansion switch valve as claimed in claim 9, wherein the stopper portion comprises a stopper stepped groove (513) formed on the valve seat (510), and a stopper flange (514) formed on an end of the magnetic valve stem (511), the stopper flange (514) being inserted into the stopper stepped groove (513) with a shape-fitting.

11. The expansion switch valve according to claim 10, wherein an escape groove (518) is formed on an end surface of the magnetic valve stem (511) for escaping the valve core (503).

12. The expansion switch valve according to claim 8, characterized in that the valve seat (510) is formed in a polyhedral structure, the magnetic valve stem (511), the inlet (501) and the outlet (502) are respectively provided on different surfaces of the polyhedral structure, wherein the inlet (501) and the outlet (502) are opened in parallel with each other on opposite sides of the valve body (500), and the magnetic valve stem (511) is installed in a direction perpendicular to the inlet (501) and the outlet (502), respectively.