CN113531151A

CN113531151A - Electromagnetic switching valve and refrigeration system with same

Info

Publication number: CN113531151A
Application number: CN202010305207.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22

Abstract

The invention discloses an electromagnetic switching valve and a refrigerating system with the same, wherein the electromagnetic switching valve comprises a valve body part with a valve cavity, a valve seat, a sliding block and a connecting rod assembly; the device also comprises a first pilot valve part, a second pilot valve part and a sliding part, and the sliding direction of the sliding part and the connecting rod component can be switched under the control of the first pilot valve part and the second pilot valve part, so that the sliding part can be switched among three working positions: the interface E is communicated with the interface S through the inner cavity of the sliding block, and the interface C is not communicated with the inner cavity of the sliding block; the E, S, C interfaces are communicated with the inner cavity of the sliding block at the second working position; and the interface S is communicated with the interface C through the inner cavity of the sliding block, and the interface E is not communicated with the inner cavity of the sliding block. The electromagnetic switching valve has three working positions, is applied to a refrigerating system, can realize defrosting operation of an outdoor unit under the condition that the working condition of an indoor heat exchanger and an outdoor heat exchanger is not changed, and reduces energy loss.

Description

Electromagnetic switching valve and refrigeration system with same

Technical Field

The invention relates to the technical field of refrigeration, in particular to an electromagnetic switching valve and a refrigeration system with the same.

Background

In a refrigeration system, a four-way valve is generally used for switching the flowing direction of a refrigerant, the four-way valve generally has two stations, when the four-way valve is applied to an air-conditioning refrigeration system, when an air conditioner is in a refrigeration cycle, a D connecting pipe of the four-way valve is communicated with a C connecting pipe, an E connecting pipe is communicated with an S connecting pipe, at the moment, high-temperature and high-pressure gas is in an outdoor heat exchanger to release heat to the outdoor environment, low-temperature and low-pressure gas is in an indoor heat exchanger to absorb heat of the indoor environment, and indoor refrigeration is realized; when the air conditioner is in a heating cycle, the D connecting pipe is communicated with the E connecting pipe, the C connecting pipe is communicated with the S connecting pipe, high-temperature and high-pressure gas is filled in the indoor heat exchanger to release heat to the indoor environment, indoor heating is realized, low-temperature and low-pressure gas is filled in the outdoor heat exchanger, and outdoor refrigeration is realized.

In practical application, when the air conditioning system is in a heating cycle for a long time, the outdoor heat exchanger will frost, and in order to ensure the normal operation of the air conditioning system, the outdoor heat exchanger needs to be defrosted.

At present, the commonly adopted mode is that a system is in a refrigeration cycle state by switching the stations of a four-way valve, so that an outdoor heat exchanger can defrost through high-temperature and high-pressure gas, and after the defrosting is finished, the stations of the four-way valve are switched to realize a heating cycle.

Disclosure of Invention

The invention provides an electromagnetic switching valve, which comprises a valve body part, a first pilot valve part and a second pilot valve part, wherein the first pilot valve part is arranged on the valve body part;

the valve body component comprises a first valve body and a second valve body, and the first valve body and the second valve body are fixedly connected or are of an integral structure; the drift diameter of the first valve body is larger than that of the second valve body;

the first end cover is used for plugging the opening of the first valve body; the sliding part comprises an isolation part and a limiting part;

a valve seat, a sliding block and a connecting rod assembly are arranged in the second valve body, the valve seat is provided with an E interface, an S interface and a C interface, the second valve body is provided with a D interface, and the sliding block is provided with a sliding block inner cavity; the connecting rod assembly comprises a connecting rod, a first piston component and a second piston component, wherein the first piston component and the second piston component are fixedly arranged at two ends of the connecting rod;

the valve body component is provided with a valve cavity, the sliding piece can slide in the valve cavity to be close to or far away from the valve seat, and the stopping part is used for limiting the sliding position of the sliding piece;

the valve cavity comprises a main valve cavity, the main valve cavity is formed between the first piston part and the second piston part and is communicated with the D interface, the valve cavity further comprises a first cavity, a second cavity and a third cavity, and the first pilot valve part and the second pilot valve part can change the pressure difference between the first cavity and the second cavity and the pressure difference between the second cavity and the third cavity so as to switch the sliding direction of the sliding block and the sliding direction of the sliding block, so that the electromagnetic switching valve has three working positions:

the inner cavity of the sliding block is communicated with the E interface and the S interface, the isolating part is abutted against the first end cover, and the limiting part is abutted against the first piston;

the inner cavity of the sliding block is communicated with the E interface, the S interface and the C interface, the isolating part is relatively far away from the first end cover and abuts against the stopping part, and the limiting part abuts against the first piston part;

and in the third working position, the inner cavity of the sliding block is communicated with the S interface and the C interface, the isolating part is relatively far away from the first end cover and is abutted against the stopping part, and the limiting part is relatively far away from the first piston component.

The invention also provides a refrigerating system, which comprises a compressor, an indoor heat exchanger and a four-way valve, wherein the inlet of the compressor is communicated with the S port of the four-way valve; the outdoor heat exchanger comprises an outdoor heat exchanger, a first electromagnetic switching valve, a second electromagnetic switching valve, a first heat exchanger and a second heat exchanger, wherein the electromagnetic switching valve is the electromagnetic switching valve;

an outlet pipeline of the compressor is divided into two branches, a first branch is communicated with a D port of the four-way valve, and a second branch is communicated with a D port of the electromagnetic switching valve;

the port C of the four-way valve is communicated with one interface of the indoor heat exchanger, and the port E is communicated with the interface S of the electromagnetic switching valve;

an E port and a C port of the electromagnetic switching valve are respectively communicated with one port of the first outdoor heat exchanger and one port of the second outdoor heat exchanger;

the other port of the first outdoor heat exchanger and the other port of the second outdoor heat exchanger are communicated with the other port of the indoor heat exchanger through a pipe;

and the second branch is also provided with a flow regulating valve.

The invention provides an electromagnetic switching valve and a refrigerating system thereof, which have three working positions through the optimized design of the structure of the electromagnetic switching valve, can realize the defrosting work of an outdoor unit on the premise of not changing the heating state of an indoor unit, and relatively reduce the energy loss.

Drawings

FIG. 1 is a schematic diagram of a refrigeration system in a refrigeration mode in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of a refrigeration system in a heating mode in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a refrigeration system in a first defrost mode in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of a refrigeration system in a second defrost mode in accordance with an embodiment of the present invention;

fig. 5 to 7 are schematic structural diagrams of the electromagnetic switching valve in a first working mode, a second working mode and a third working mode in the specific embodiment, respectively;

FIGS. 8a and 8b are partial schematic views of a first pilot valve part of a solenoid operated switching valve in an energized state and a de-energized state, respectively, in accordance with an exemplary embodiment;

FIGS. 9a and 9b are partial schematic views of a second pilot valve part of the solenoid operated switching valve in an energized state and a de-energized state, respectively, in accordance with an exemplary embodiment;

FIGS. 10 and 11 show partial schematic views of a first embodiment of a valve body member and slide engagement structure, with the slide in a first position in FIG. 10 and in a second position in FIG. 11;

FIGS. 12 and 13 are partial schematic views of a second embodiment of a valve body member and slide engagement structure, with the slide in a first position in FIG. 12 and in a second position in FIG. 13;

FIGS. 14 and 15 show partial schematic views of a third embodiment of a valve body member and slide engagement structure, with the slide in a first position in FIG. 14 and in a second position in FIG. 15;

16a, 16b and 16c show schematic views of the first embodiment of the valve seat and slider cooperating structure with the slider in the first, second and third operating positions, respectively;

17a, 17b and 17c show schematic views of the first embodiment of the valve seat and slider cooperating structure with the slider in the first, second and third operating positions, respectively;

18a, 18b and 18c show schematic views of the first embodiment of the valve seat and slider cooperating structure with the slider in the first, second and third operating positions, respectively;

fig. 19 is a schematic structural diagram of another embodiment of the electromagnetic switching valve provided in the present invention;

FIGS. 20a to 20d illustrate four mating relationships of the slider and the valve seat when the electromagnetic switch valve is in the first working position;

21 a-21 d illustrate four mating relationships of the slider and the valve seat when the electromagnetic switch valve is in the second operating position;

fig. 22a to 22d illustrate four fitting relationships of the slider and the valve seat when the electromagnetic switching valve is in the third working position.

Description of reference numerals:

a compressor 101, an indoor heat exchanger 102, a first outdoor heat exchanger 131, a second outdoor heat exchanger 132, a four-way valve 104, an electromagnetic switching valve 105, and a flow rate adjusting valve 106;

a first chamber Q1, a second chamber Q2, a third chamber Q3, a main valve chamber Q4;

a first valve body 211, a body portion 2111, a connecting portion 2112, a second valve body 212, a first end cap 213, a second end cap 214, an adapter 215, a first step 2151, a second step 2152, an axial projection 2153;

a valve seat 202;

a slider 203, a slider inner cavity 203a, a first cavity sidewall 231, a second cavity sidewall 232;

the connecting rod assembly 204, the connecting rod 241, the first piston member 242, the second piston member 243;

the sliding piece 205, the isolation part 251, the piston bowl 2511, the isolation block 2512, the sealing ring 2513, the limiting part 252 and the connecting rod 253;

a first pilot valve member 206, a first pilot valve housing 261, a first pilot valve seat 262, a first pilot valve bowl 263, a first coil 264, a first stationary core 265, a first movable core 266, a first return elastic member 267, a first connecting bracket 268;

the second pilot valve component 207, the second pilot valve sleeve 271, the second pilot valve seat 272, the first port 272a, the second port 272b, the second pilot valve bowl 273, the second coil 274, the second stationary core 275, the second movable core 276, the second return elastic member 277, and the second connecting frame 278.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

For the convenience of understanding and brevity of description, the following description is provided in conjunction with the electromagnetic switching valve and the refrigeration system having the same, and the advantageous effects will not be repeated.

Referring to fig. 1 to 4, fig. 1 is a schematic diagram illustrating a refrigeration system in a refrigeration mode according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a refrigeration system in a heating mode in accordance with an embodiment of the present invention; FIG. 3 is a schematic diagram of a refrigeration system in a first defrost mode in accordance with an embodiment of the present invention; fig. 4 is a schematic diagram of a refrigeration system in a second defrost mode in accordance with an embodiment of the present invention.

As shown in the figure, the refrigeration system in this embodiment includes a compressor 101, an indoor heat exchanger 102, a first outdoor heat exchanger 131, a second outdoor heat exchanger 132, a four-way valve 104, and an electromagnetic switching valve 105.

The four-way valve 104 is a currently general four-way valve structure and has only two working positions, namely a working position where the port E is communicated with the port S and the port D is communicated with the port C, and a working position where the port E is communicated with the port D and the port S is communicated with the port C.

The solenoid operated switching valve 105 is an improved solenoid operated switching valve based on the existing four-way valve, and has three working positions, which will be described in detail in the following description of the working modes of the refrigeration system.

The inlet of the compressor 101 is communicated with an S port of the four-way valve 104, an outlet pipeline of the compressor 101 is divided into two branches, a first branch is communicated with a D port of the four-way valve 104, a second branch is communicated with a D port of the electromagnetic switching valve 105, and a throttle valve 106 is further disposed on the second branch, specifically, the throttle valve 106 may be an expansion valve to adjust the flow rate of refrigerant on each branch, so as to ensure the normal operation of the refrigeration system.

A port C of the four-way valve 104 communicates with one port of the indoor heat exchanger 102, and a port E communicates with a port S of the electromagnetic switching valve 105.

An E port of the electromagnetic switching valve 105 communicates with one port of the first outdoor heat exchanger 131, and a C port of the electromagnetic switching valve 105 communicates with one port of the second outdoor heat exchanger 132.

The other port of the first outdoor heat exchanger 131 and the other port of the second outdoor heat exchanger 132 are communicated with the other port of the indoor heat exchanger through a pipe line on which a throttling element is provided.

As set forth above, the operation modes of the refrigeration system include a cooling mode, a heating mode, and a defrost mode, wherein the defrost mode has two situations, which are described below.

Refrigeration mode

As shown in fig. 1, in the cooling mode, the four-way valve 104 is in an operating position where the ports D and E are communicated and the ports C and S are communicated, and the electromagnetic switching valve 105 is in an operating position where the ports E, S and C are communicated with each other.

Since the D interface of the electromagnetic switching valve 105 is in a closed state, the flow regulating valve 106 can be closed in practical application, and it is also feasible to regulate the flow regulating valve 106 to a smaller opening degree; the high-temperature high-pressure refrigerant at the outlet end of the compressor 101 mainly flows to the D port of the four-way valve 104 through the first branch line, and then flows to the S port of the electromagnetic switching valve 105 through the E port of the four-way valve 104, because the S port of the electromagnetic switching valve 105 is communicated with the E port and the C port thereof, the refrigerant flowing into the S port is divided into two paths, and flows into the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 through the E port and the C port, both the outdoor heat exchangers are in a heating state at this time, the refrigerant passes through the outdoor heat exchanger and then becomes a low-temperature low-pressure state through a throttling element, passes through the indoor heat exchanger 102, the indoor heat exchanger 102 is in a cooling state at this time, and finally returns to the compressor 101 through the four-way valve 104.

Heating mode

As shown in fig. 2, in the heating mode, the four-way valve 104 is in an operating position where the ports D and C are communicated and the ports E and S are communicated, and the electromagnetic switching valve 105 is in an operating position where the ports E, S and C are communicated with each other.

Because the D interface of the electromagnetic switching valve 105 is in a closed state, the flow regulating valve 106 can be closed during actual application, and the flow regulating valve 106 can be regulated to a smaller opening degree; the high-temperature and high-pressure refrigerant at the outlet end of the compressor 101 mainly flows to the D port of the four-way valve 104 through the first branch line, and then flows to the indoor heat exchanger 102 through the C port of the four-way valve 104, at this time, the indoor heat exchanger 103 is in a heating state, then the refrigerant changes to a low-temperature and low-pressure state after passing through the throttling element, and respectively flows into the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132, at this time, both the outdoor heat exchangers are in a cooling state, and the refrigerant flowing out of the two outdoor heat exchangers respectively flows to the E port and the C port of the electromagnetic switching valve 105, flows to the four-way valve 104 through the S port of the electromagnetic switching valve 105, and finally returns to the compressor 101.

First defrost mode

As shown in fig. 3, in the first defrosting mode, the four-way valve 104 is in the working position where the port D is communicated with the port C and the port E is communicated with the port S, the electromagnetic switching valve 105 is in the working position where the port E is communicated with the port S and the port D is communicated with the port C.

The flow rate adjustment valve 106 can adjust its opening degree according to the defrosting demand, and should also ensure the heating effect of the indoor heat exchanger 102.

The high-temperature high-pressure refrigerant at the outlet end of the compressor 101 is divided into two branches, after a part of the refrigerant is regulated by the flow regulating valve 106, the refrigerant flows into the second outdoor heat exchanger 132 through the passage from the interface D to the interface C of the electromagnetic switching valve 105, at this time, the second outdoor heat exchanger 132 is in a defrosting state, the refrigerant flowing out of the second outdoor heat exchanger 132 flows to the first outdoor heat exchanger 131 due to the action of pressure difference, and returns to the compressor 101 through the passage from the interface E of the electromagnetic switching valve 105 to the interface S and the passage from the interface E of the four-way valve 104 to the interface S; the other part of the refrigerant at the outlet end of the compressor 101 flows to the indoor heat exchanger 102 through the passage from the port D to the port C of the four-way valve 104, the indoor heat exchanger 102 is in a heating state, the refrigerant flowing out of the indoor heat exchanger 102 becomes a low-temperature and low-pressure state after passing through a throttling element, flows through the first outdoor heat exchanger 131, the first outdoor heat exchanger 131 is in a cooling state, and the refrigerant flowing out of the first outdoor heat exchanger 131 finally returns to the compressor 101 through the electromagnetic switching valve 105 and the four-way valve 104.

Second defrost mode

As shown in fig. 4, in the second defrosting mode, the four-way valve 104 is in the working position where the D port is communicated with the C port and the E port is communicated with the S port, and the electromagnetic switching valve 105 is in the working position where the D port is communicated with the E port and the C port is communicated with the S port.

The high temperature and high pressure refrigerant at the outlet end of the compressor 101 is divided into two branches, after a part of the refrigerant is adjusted by the flow control valve 106, the refrigerant flows into the first outdoor heat exchanger 131 through the passage from the interface D to the interface E of the electromagnetic switching valve 105, at this time, the first outdoor heat exchanger 131 is in a defrosting state, the refrigerant flowing out of the first outdoor heat exchanger 131 flows to the second outdoor heat exchanger 132 due to the effect of pressure difference, and returns to the compressor 101 through the passage from the interface E to the interface S of the passage four-way valve 104 from the interface C of the electromagnetic switching valve 105 to the interface S; the other part of the refrigerant at the outlet end of the compressor 101 flows to the indoor heat exchanger 102 through the passage from the D port to the C port of the four-way valve, the indoor heat exchanger 102 is in a heating state, the refrigerant flowing out of the indoor heat exchanger 102 becomes a low-temperature and low-pressure state through the throttling element, flows through the second outdoor heat exchanger 132, the second outdoor heat exchanger 132 is in a cooling state, and the refrigerant flowing out of the second outdoor heat exchanger 132 finally returns to the compressor 101 through the electromagnetic switching valve 105 and the four-way valve 104.

As can be seen from the above, the outdoor heat exchanger is divided into two parts, and by combining the electromagnetic switching valve 105 with three working positions provided by the present invention with the conventional four-way valve 104, the refrigeration system can have a conventional refrigeration mode and a heating mode, and can defrost the outdoor heat exchanger without affecting the heating of the indoor heat exchanger 102.

As can be seen from the operation modes of the upper refrigeration system, the electromagnetic switching valve 105 according to the present invention can be switched between three operation positions, specifically, the slider thereof can be switched between three operation positions with respect to the valve seat:

the sliding block is positioned at a first working position, the interface E and the interface S of the valve seat are communicated through an inner cavity of the sliding block, and the interface C is not communicated with the inner cavity of the sliding block, namely the interface C is communicated with the interface D through a valve cavity; it can be understood that the first working position is the working position of the electromagnetic switching valve 105 in the first defrosting mode in the refrigeration system;

the sliding block is positioned at a second working position, and the interface E, the interface S and the interface C of the valve seat are communicated with the inner cavity of the sliding block, namely the interface E, the interface S and the interface C are communicated with each other; it can be understood that the second working position is the working position where the electromagnetic switching valve 105 is located in the refrigeration mode and the heating mode in the refrigeration system;

the sliding block is positioned at a third working position, the interface S and the interface C of the valve seat are communicated through an inner cavity of the sliding block, and the interface E is not communicated with the inner cavity of the sliding block, namely the interface E is communicated with the interface D through a valve cavity; it can be understood that the third operating position is the operating position of the electromagnetic switching valve 105 in the second defrosting mode in the refrigeration system.

The following describes the specific structure of the electromagnetic switching valve provided by the present invention in detail with reference to the accompanying drawings.

Referring to fig. 5 to 7, fig. 5 to 7 are schematic structural diagrams of the electromagnetic switching valve in a first working mode, a second working mode and a third working mode according to the embodiment, respectively.

In this embodiment, the solenoid-operated switching valve includes a main valve and a pilot valve.

The main valve of the electromagnetic switching valve includes a valve body member having a valve cavity, a valve seat 202, a slider 203, and a connecting rod assembly 204.

The valve body component is provided with a D port communicated with the valve cavity; the valve seat 202 is provided with an E interface, an S interface and a C interface; the connecting rod assembly 204 comprises a connecting rod 241, and a first piston member 242 and a second piston member 243 fixedly arranged at two ends of the connecting rod 241; the slider 203 is provided with a slider inner cavity 203a, the bottom surface of the slider 203 is tightly pressed and attached to the valve seat 202, and the slider can slide along the valve seat 202 under the drive of the connecting rod assembly 204.

In this embodiment, the main valve further comprises a slider 205, the slider 205 comprising a partition 251.

In this embodiment, the valve cavity includes a large diameter cavity and a small diameter cavity, and the valve seat 202, the slider 203 and the connecting rod assembly 204 are disposed in the small diameter cavity; the partition 251 of the slider 205 is located in the large diameter chamber, and the slider 205 is able to slide within the valve chamber to approach or move away from the valve seat 202.

The pilot valve of the solenoid switched valve comprises in particular a first pilot valve part 206 and a second pilot valve part 207 which cooperate for varying the pressure difference across the connecting-rod assembly 204 and the pressure difference across the slide 205 for switching the sliding direction of the slide 202 and the sliding direction of the slide 205 such that the slide 202 can be switched between the aforementioned three operating positions.

It will be appreciated that the two piston members of the connecting rod assembly 204 each slidably and sealingly engage the valve cavity, and in this embodiment, the isolating portion 251 of the slider 205 slidably and sealingly engages the valve cavity, such that the pressure differential across the connecting rod assembly 204, and the pressure differential across the isolating portion 251, can be controlled to cause both to slide.

Specifically arranged, the first piston member 242 of the linkage assembly 204 is disposed relatively close to the slider 205 and the second piston member 243 is disposed relatively far from the slider 205.

It is understood that, as set forth above, the valve chamber of the valve body member is divided into four chambers sealed from each other, namely, a first chamber Q1 formed between the partition 251 of the slider 205 and one end wall of the valve body member, a second chamber Q2 formed between the partition 251 and the second piston member 242, a third chamber Q3 formed between the first piston member 241 and the other end wall of the valve body member, and a main valve chamber Q4 formed between the first piston member 241 and the second piston member 242.

That is, the first and second

pilot valve parts

206 and 207 can change the pressure difference of the second and third chambers Q2 and Q3 and the pressure difference of the first and second chambers Q1 and Q2, thereby switching the sliding direction of the slider 203 and the sliding direction of the slider 205.

Specifically, the D port of the valve body member communicates with the main valve chamber Q4, and it will be appreciated that in a refrigeration system, the D port is connected to the high pressure side of the system, i.e., the main valve chamber Q4 is normally high pressure.

Specifically, the first pilot valve member 206 varies the pressure differential across the linkage assembly 204, i.e., the second chamber Q2 and the third chamber Q3, and the second pilot valve member 207 varies the pressure of the first chamber Q1, in conjunction with the variation of the pressure of the first pilot valve member 206 to the second chamber Q2, to effect control of the pressure differential between the first chamber Q1 and the second chamber Q2.

Referring to fig. 8a and 8b together, fig. 8a and 8b are partial schematic views of a first pilot valve part of a solenoid operated switching valve in an energized state and a de-energized state, respectively, according to an embodiment.

In this embodiment, the first pilot valve member 206 includes a first driver portion, a first pilot valve sleeve 261 having a first sleeve cavity, a first pilot valve seat 262 and a first pilot valve bowl 263; the first guide valve seat 262 and the first guide valve bowl 263 are located in the first pocket, and the first guide valve seat 261 has a first connection port, a second connection port, and a third connection port.

The first guide valve bowl 263 is tightly attached to the first guide valve seat 262, and under the driving of the first driving part, the first guide valve bowl 263 can slide along the first guide valve seat 262 to switch between two stations, and is configured to:

the first connecting port is communicated with the second connecting port through the inner cavity of the first guide valve bowl 263 and the third connecting port is communicated with the first sleeve cavity;

and the first connecting port is communicated with the first sleeve cavity, and the second connecting port is communicated with the third connecting port through the inner cavity of the first guide valve bowl 263.

The first connection port (the connection port on the left side in the drawing) communicates with the second chamber Q2 of the main valve via a capillary e1, the second connection port (the connection port on the middle side in the drawing) communicates with the S port of the main valve via a capillary S1, the third connection port (the connection port on the right side in the drawing) communicates with the third chamber Q3 of the main valve via a capillary c1, and the first set chamber communicates with the D port of the main valve via a capillary D1.

In a specific embodiment, the first driving unit includes a first coil 264, a first stationary core 265, a first movable core 266, a first return elastic member 267, and a first connecting frame 268; wherein, first elastic component 267 that resets is located between first quiet iron core 265 and the first iron core 266 that moves, and first link 268 is connected first iron core 266 and first pilot valve bowl 263 that moves, and through the break-make electricity of first coil 264, combine first elastic component 267 that resets to control first iron core 266 and drive the action of first link 268 to drive first pilot valve bowl 263 and slide, thereby control the connected state between each interface, and then the pressure of the second cavity Q2 and the third cavity Q3 of control main valve.

In the illustrated embodiment, the first pilot valve member 206 is in the first position in the power-off state, at this time, the second cavity Q2 of the main valve is in the low-pressure state through the capillary e1, the first connection port, the second connection port, and the capillary S1, the second cavity Q2 of the main valve is in the high-pressure state, the third cavity Q3 of the main valve is in the high-pressure state through the capillary c1, the third connection port, the first sleeve cavity, and the capillary D1, and the third cavity Q3 is in the high-pressure state.

When the first pilot valve member 206 is in the second position in the energized state, the second cavity Q2 of the main valve is in the high-pressure state through the capillary e1, the first connection port, the first sleeve cavity and the capillary D1, the second cavity Q2 is in the low-pressure state, the third cavity Q3 of the main valve is in the high-pressure state through the capillary c1, the third connection port, the second connection port and the capillary S1, and the third cavity Q3 is in the low-pressure state.

Referring to fig. 9a and 9b together, fig. 9a and 9b are partial schematic views of a second pilot valve part of a solenoid operated switching valve in an energized state and a de-energized state, respectively, according to an embodiment.

In this embodiment, the second pilot valve part 207 comprises a second drive portion, a second pilot valve sleeve 271 with a second sleeve cavity, a second pilot valve seat 272 and a second pilot valve bowl 273; a second pilot valve seat 272 and a second pilot valve bowl 273 are located in the second set of cavities, the second pilot valve seat 272 having a first port and a second port.

The second pilot valve bowl 273 is pressed against the second pilot valve seat 272, and the second pilot valve bowl 273 is configured to be slidable along the second pilot valve seat 272 by the driving of the second driving unit so as to be switched between two states:

in the first state, the first port and the second port are communicated through the inner cavity of the second pilot valve bowl 273;

in the second state, the first port is communicated with the second cavity, and the second port is communicated with the inner cavity of the second pilot valve bowl 273.

The first port (port on the left side in the figure) is communicated with a first cavity Q1 of the main valve through a capillary e2, the second port (port on the right side in the figure) is communicated with an S port of the main valve through a capillary S2, and the second sleeve cavity is communicated with a D port of the main valve through a capillary D2.

In a specific scheme, the second driving part comprises a second coil 274, a second stationary iron core 275, a second movable iron core 276, a second reset elastic piece 277 and a second connecting frame 278; wherein, the second elastic component 277 that resets is located between second quiet iron core 275 and the second movable iron core 276, and the second link 278 is connected the second movable iron core 276 and is led valve bowl 273, like this, through the on-off of second coil 274, combine the second elastic component 277 that resets to control the second movable iron core 276 and drive the action of second link 278 to drive the second and lead valve bowl 273 and slide, thereby control the connected state between each interface, and then the pressure state in the first cavity Q1 of control main valve.

As shown in fig. 9a, when the second coil 274 (marked in fig. 5) of the second pilot valve component 207 is in the power-on state, the second movable iron core 276 attracts the second stationary iron core 275, so as to drive the second pilot valve bowl 273 to slide towards the direction close to the second stationary iron core 275, the second return elastic member 277 is compressed to store deformation energy, the inner cavity of the second pilot valve bowl 273 communicates with the first port and the second port of the second pilot valve seat, the second pilot valve component 207 is in the first state, at this time, the first cavity Q1 of the main valve communicates with the S port through the first port, the second port and the capillary S2, and the first cavity Q1 is in the low-pressure state.

As shown in fig. 9b, in the power-off state of the second coil 274 of the second pilot valve component 207, under the action of the elastic force of the second reset elastic member 277, the second movable iron core 275 drives the second pilot valve bowl 273 to slide in the direction away from the second stationary iron core 275, the first port is communicated with the first set of cavities, the second port is communicated with the inner cavity of the second pilot valve bowl 273, the second pilot valve component 207 is in the second state, at this time, the first cavity Q1 of the main valve is communicated with the D port through the first port, the second set of cavities and the capillary D2, and the first cavity Q1 is in the high-pressure state.

The electromagnetic switching valve further comprises a stopper for limiting the sliding position of the sliding member 205, and specifically, the sliding member 205 can be switched between two positions under the action of the pressure difference between the first cavity Q1 and the second cavity Q2, and simultaneously, the sliding member 203 can be switched between the three working positions in combination with the pressure difference between the second cavity Q2 and the third cavity Q3.

As shown in fig. 5, the first pilot valve component 206 is in a de-energized state, the second pilot valve component 207 is in an energized state, that is, the first chamber Q1 is in a low-pressure state, the second chamber Q2 is in a low-pressure state, and the third chamber Q3 is in a high-pressure state, so that the connecting rod assembly 204 drives the slider 203 to move to the left (in the illustrated orientation), and pushes the slider 205 to move to the left, until the slider 205 abuts against the end wall of the corresponding side of the valve body component to be in the first position, the connecting rod assembly 204 abuts against the slider 205, so that the slider 203 is in the first working position, the E port is communicated with the S port through the inner cavity of the slider 203, and the C port is communicated with the D port through the main valve chamber Q4, that is in the working position of the solenoid switching valve in the first defrosting mode in the refrigeration system.

As shown in fig. 6, the first pilot valve component 206 and the second pilot valve component 207 are both in a power-off state, that is, the first cavity Q1 is in a high-pressure state, the second cavity Q2 is in a low-pressure state, and the third cavity Q3 is in a high-pressure state, so that the sliding component 205 moves towards the right side to a second position against the stop under the action of the pressure difference between the two ends thereof, the connecting rod component 204 drives the sliding component 203 to move towards the left side to abut against the sliding component 205, so that the sliding component 203 is in the second working position, the E port, the S port, and the C port are communicated with each other through the inner cavity of the sliding component 203, and the D port is not communicated with the E port, the S port, and the C port, that is, the electromagnetic switching valve is in the working position in the cooling mode and the heating mode in the cooling system.

As shown in fig. 7, the first pilot valve component 206 is in an energized state, the second pilot valve component 207 is in a de-energized state, that is, the first cavity Q1 is in a high-pressure state, the second cavity Q2 is in a high-pressure state, and the third cavity Q3 is in a low-pressure state, at this time, the sliding component 205 is kept in the second position against the stop, the connecting rod component 204 drives the sliding block 203 to move towards the right side to abut against the corresponding side end wall of the valve body component, so that the sliding block 203 is in the third working position, the S port is communicated with the C port through the inner cavity of the sliding block 203, and the E port is communicated with the D port through the main valve cavity Q4, that is, the working position of the electromagnetic switching valve in the second defrosting mode in the refrigeration system.

It can be understood that, in a specific arrangement, the structures of the stopping portion, the sliding member 205 and the connecting rod assembly 204 should be cooperatively arranged, so that the three components can cooperate to achieve corresponding functions in the states of the aforementioned working positions.

In actual installation, when the connecting rod assembly 204 drives the sliding block 203 to slide and the sliding part 205 slides, frictional resistance exists between the connecting rod assembly 204 and the valve body component, so that in order to ensure that the connecting rod assembly 204 and the sliding part 205 can move as described above under the action of corresponding pressure difference, parameters of a large-diameter cavity and a small-diameter cavity of the valve body component need to be defined, and the following detailed description refers to the following parameters: radius R1 of the large diameter cavity, radius R2 of the small diameter cavity, minimum operating pressure difference Δ P when the system is in operation, and friction force F of the connecting rod assembly 204_fFrictional force F of the slider 205_f’。

When the electromagnetic switching valve is at the second working position, the first pilot valve part 206 and the second pilot valve part 207 are both in a power-off state, the sliding part 205 is at the second position, and the connecting rod assembly 204 is abutted against the sliding part 205; when the second working position is switched to the first working position, the first pilot valve part 206 does not act, the second pilot valve part 207 is switched from power off to power on, the pressure of the first cavity Q1 is switched from high pressure to low pressure, and pi R2 is satisfied²ΔP＞F_f+F_f' to ensure reliable commutation.

When the electromagnetic switching valve is switched from the first working position to the second working position, the first pilot valve part 206 does not act, the second pilot valve part 207 is switched from power on to power off, the pressure of the first cavity Q1 is changed from low pressure to high pressure, and pi (R1) is satisfied²-R2²)ΔP＞F_f+F_f' to ensure reliable commutation.

When the electromagnetic switching valve is switched from the second working position to the third working position, the first pilot valve part 206 is switched from power off to power on, the second pilot valve part 207 is not operated, the pressure of the second cavity Q2 is changed from low pressure to high pressure, the pressure of the third cavity Q3 is changed from high pressure to low pressure, and pi R2 is satisfied²ΔP＞F_fReliable commutation can be guaranteed.

When the electromagnetic switching valve is switched from the third working position to the second working position, the first pilot valve part 206 is powered on or powered off, the second pilot valve part 207 is not operated, the pressure of the second cavity Q2 is changed from high pressure to low pressure, the pressure of the third cavity Q3 is changed from low pressure to high pressure, and pi R2 is satisfied²ΔP＞F_fReliable commutation can be guaranteed.

When the electromagnetic switching valve is switched from the first working position to the third working position, the second pilot valve part 207 is firstly switched from power on to power off, the pressure of the first cavity Q1 is changed from low pressure to high pressure, and pi (R1) is satisfied²-R2²)ΔP＞F_f+F_f' when switching to the second working position, the first pilot valve part 206 is switched from off to on again, the pressure of the second chamber Q2 is changed from low pressure to high pressure, the pressure of the third chamber Q3 is changed from high pressure to low pressure, and pi R2 is satisfied²ΔP＞F_fReliable commutation can be guaranteed.

The electromagnetic switching valve is switched from the third working position to the first working positionWhen switching, the first pilot valve component 206 is firstly switched from power on to power off, the pressure of the second cavity Q2 is changed from high pressure to low pressure, the pressure of the third cavity Q3 is changed from low pressure to high pressure, and pi R2 is satisfied²ΔP＞F_fWhen the pressure is switched to the second working position, the second pilot valve part 207 is switched from power off to power on, the pressure of the first cavity Q1 is switched from high pressure to low pressure, and the pressure meets pi R2²ΔP＞F_f+F_f' reliable commutation can be achieved.

From the above, in order to ensure reliable reversing, the radius of the valve cavity in which the partition 251 of the slider 205 is located must be larger than the radius of the valve cavity in which the connecting rod assembly 204 is located, so that when the valve cavity of the valve body member is disposed, the valve cavity is divided into the large-diameter cavity and the small-diameter cavity, and pi (R1) should be satisfied at the same time²-R2²)ΔP＞F_f+F_f'。

It can be understood that the minimum operating pressure difference Δ P during the operation of the system is determined according to the system requirements of the actual application, and the related friction force is related to the material of the related components, and can be determined according to the actual application.

In this embodiment, the valve body component of the main valve specifically includes a first valve body 211, a second valve body 212, a first end cap 213 and a second end cap 214, wherein the first valve body 211 and the second valve body 212 are both in a cylindrical structure, the adjacent ends of the two are fixedly connected, and the inner cavities of the two are communicated, the first end cap 213 seals the opening of the first valve body 211, the second end cap 214 seals the opening of the second valve body 212, the large diameter cavity is formed in the first valve body 211, and the small diameter cavity is formed in the second valve body 212, that is, the drift diameter of the first valve body 211 is larger than the drift diameter of the second valve body 212; it will be appreciated that when so configured, the first end cap 213 is one end wall of the valve body member and the second end cap 214 is the other end wall of the valve body member, and specifically, the first cavity Q1 is formed between the first end cap 213 and the slider 205 and the third cavity Q3 is formed between the second piston member 242 and the second end cap 214.

In addition to the above-described structure of the valve body member, in this example, the stopper portion for regulating the slider 205 is provided at the joint of the first valve body 211 and the second valve body 212.

Several implementations of the fixed connection of the first valve body 211 and the second valve body 212 and several implementations of the stopping portion and the isolating portion 251 are described in detail below.

Referring to fig. 10 and 11, fig. 10 and 11 show partial schematic views of a first embodiment of a valve body member and slide engagement structure, with the slide in a first position in fig. 10 and in a second position in fig. 11.

In the solution shown in fig. 10 and 11, the first valve body 211 and the second valve body 212 are fixedly connected by means of an adapter 215 having a through hole.

The adapter 215 includes a first step 2151 and a second step 2152; the first step portion 2151 has a first step surface facing the first valve body 211, and the first valve body 211 is fixedly sleeved on the first step portion 2151 and abuts against the first step surface, specifically, the first step portion 2151 and the first step surface can be fixed by welding; the second step portion 2152 has a second step surface facing the second valve body 212, and the second valve body 212 is fixedly fitted over the second step portion 2152 and abuts against the second step surface, specifically, welded thereto, or, in actual installation, the second valve body 212 is also fixedly fitted over the second step portion 2152.

It will be appreciated that the first step 2151 has a length in the axial direction to provide a length for the first valve body 211 and the adapter 215 to have a matching length, and the second step 2152 also has a length in the axial direction to provide a length for the second valve body 212 and the adapter 215 to have a matching length, so as to ensure stability and reliability of fixing the adapter 215 to the first valve body 211 and the second valve body 212.

In this embodiment, the end surface of the first step portion 2151 facing the first end cap 213 forms the stop, and as shown in fig. 11, the slider 205 abuts against the end surface of the first step portion 2151 when in the second position; as shown in fig. 10, the slider 205 abuts against the first end cap 213 in the first position.

It is understood that, in practice, the first valve body 211 may be fixed inside the first step portion 2151, and in this case, the adapter 215 may be provided with a protrusion extending toward the first end cap 213 to form a stop for limiting the sliding position of the sliding element 205.

In this embodiment, the isolation portion 251 of the sliding member 205 is embodied as a piston bowl 2511, and the opening direction of the piston bowl 2511 faces the first end cap 213.

According to the working positions of the electromagnetic switching valve, in practical application, under a normal working state, the pressure of the first cavity Q1 is higher than that of the second cavity Q2 or is consistent with that of the second cavity Q2, and the piston bowl 2511 is in a one-way sealing structure form, so that the sealing requirement can be met by arranging one piston bowl 2511 and enabling the opening of the piston bowl to face the first cavity Q1.

Referring to fig. 12 and 13, fig. 12 and 13 show partial schematic views of a second embodiment of a valve body member and slider engagement structure, with the slider in a first position in fig. 12 and in a second position in fig. 13.

In the solution shown in fig. 12 and 13, the first valve body 211 and the second valve body 212 are directly connected, wherein the first valve body 211 comprises a body portion 2111 and a connecting portion 2112, the diameter of the connecting portion 2112 is smaller than the diameter of the body portion 2111, and is used for connecting with the first valve body 211, specifically, the first valve body 211 is externally sleeved and fixed on the connecting portion 2112, and the two can be fixed by welding.

Meanwhile, the connecting portion 2112 forms a stopper for limiting the sliding position of the slider 205, and as shown in fig. 13, the slider 205 abuts against the connecting portion 2112 to limit the sliding position when in the second position.

In this embodiment, the isolation portion 251 of the slider 205 specifically includes an isolation block 2512 and a seal ring 2513, and the isolation block 2512 and the first valve body 211 are sealed by the seal ring 2513.

In practical application, in the structure of the valve body member shown in fig. 10 and 11, the structure shown in fig. 12 and 13 may be adopted as the isolation portion 251, and similarly, in the structure of the valve body member shown in fig. 12 and 13, the structure shown in fig. 10 and 11 may be adopted as the isolation portion 251.

Referring to fig. 14 and 15, fig. 14 and 15 show partial schematic views of a third embodiment of a valve body member and slide engagement structure, with the slide in a first position in fig. 14 and in a second position in fig. 15.

In the solution shown in fig. 14 and 15, the first valve body 211 and the second valve body 212 are fixedly connected by an adapter 215 having a through hole.

The adaptor 215 includes a first step portion 2151 and a second step portion 2152, which are respectively fixed to the first valve body 211 and the second valve body 212 in a sleeved manner, and the structural form is similar to the scheme shown in fig. 10 and 11, and will not be described again here.

The difference between the two is that: in this solution, the adapter 215 is further provided with an axial projection 2153 extending towards the inside of the first valve body 211, the axial projection 2153 forming the aforementioned stop for limiting the sliding position of the sliding element 205, as shown in fig. 15, when the sliding element 205 is in the second position, the stop is achieved by abutting against the axial projection 2153.

In this scheme, the isolation portion 251 of the sliding member 205 is specifically two fixedly connected piston bowls 2511, and the two piston bowls 2511 are arranged in a back-to-back manner, so that the isolation portion 251 can realize bidirectional sealing, and damage to related components during abnormal operation can be ensured.

On this basis, to avoid damage to the corresponding piston bowl 2511 when the spacer 251 of the slider 205 abuts against the axial projection 2153, the diameter of the axial projection 2153 should be smaller than the inner diameter of the piston bowl 2511.

In the three embodiments shown in fig. 10 to 15, the sliding element 205 further includes a limiting portion 252 fixedly connected to the isolation portion 251, and in the second position, the sliding element 205 is limited by the isolation portion 251 abutting against the limiting portion, and in combination with fig. 5 and 6, the connecting rod assembly 204 directly abuts against the limiting portion 252 when abutting against the sliding element 205.

In the illustrated embodiment, the isolation portion 251 and the limiting portion 252 are connected by a connecting rod 253, the limiting portion 252 is specifically located in the small-diameter cavity, the diameter of the limiting portion 252 is matched with that of the small-diameter cavity, but the limiting portion 252 has a through hole so as to communicate the chambers on the two sides of the small-diameter cavity, as described above, the second cavity Q2 is formed between the isolation portion 251 and the second piston member 242, and therefore the limiting portion 252 should not be separated from the cavity.

Of course, in actual installation, if the limiting portion 252 is a solid structure, a gap should be left between the outer periphery thereof and the valve cavity wall, and the illustrated embodiment can ensure the stability of the overall operation of the sliding member 205.

It is understood that, in practice, the sliding member 205 is not limited to the specific structure shown in the drawings, as long as the requirement of forming the first cavity Q1 and the second cavity Q2 separately and limiting the sliding position of the connecting rod assembly 204 can be satisfied.

Besides the above-mentioned modes, the first valve body 211 and the second valve body 212 may be integrally formed in practice.

Referring to fig. 5 to 7 again, in order to make the electromagnetic switching valve have three working positions and ensure the normal operation at each working position, the valve seat 202 and the sliding block 203 of the main valve need to have reasonable structural matching.

Specifically, the E port, the S port, and the C port of the valve seat 202 are arranged in series, i.e., the S port is located between the E port and the C port. Of course, in actual installation, the arrangement of the E interface, the S interface, and the C interface is not limited as long as the following conditions can be satisfied.

The slider 203 is in the first work position, and slider 203 does not cover the C interface of valve seat 202 completely, and C interface and slider inner chamber 203a do not communicate, and slider 203 covers E interface and the S interface of valve seat 202 completely, and E interface and S interface all communicate with slider inner chamber 203a, and like this, E interface accessible slider inner chamber 203a and S interface intercommunication, C interface accessible valve pocket and D interface intercommunication.

That is, the slider cavity 203a has a first projection on the plane of the upper surface of the valve seat 202, the first projection covers at least a portion of the E port, the first projection covers at least a portion of the S port, but the first projection does not cover the C port.

Thus, the following four conditions exist for the engagement of the slider 203 with the valve seat 202:

first, the first projection (section line in the figure) of the slider cavity 203a completely covers the E-port and the S-port, as shown in fig. 20 a;

second, the first projection (section line in the figure) of the inner cavity 203a of the slider completely covers the E-port and partially covers the S-port, as shown in fig. 20 b;

third, the first projection (section line in the figure) of the inner cavity 203a of the slider completely covers the S port and partially covers the E port, as shown in fig. 20 c;

fourth, the first projection (section line in the figure) of the slider cavity 203a partially covers the E-port and also partially covers the S-port, as shown in fig. 20 d.

The sliding block 203 is in the second working position, the sliding block 203 completely covers the interface E, the interface S and the interface C of the valve seat 202, and the interface E, the interface S and the interface C are all communicated with the sliding block inner cavity 203 a.

That is, the slider cavity 203a has a second projection on the plane of the upper surface of the valve seat 202, the second projection completely covers the S port, the second projection covers at least a portion of the E port, and the second projection covers at least a portion of the C port.

first, the second projection (section line) of the slider cavity 203a completely covers the E-port and the C-port, as shown in fig. 21 a;

second, the second projection (section line in the figure) of the inner cavity 203a of the slider completely covers the interface C and partially covers the interface E, as shown in fig. 21 b;

third, the second projection (section line in the figure) of the slider cavity 203a completely covers the E-port and partially covers the C-port, as shown in fig. 21C;

fourth, the second projection (section line in the figure) of the slider cavity 203a partially covers the E-port and also partially covers the C-port, as shown in fig. 21 d.

The slider 203 is in the third working position, the slider 203 does not completely cover the E port of the valve seat 202, the E port is not communicated with the slider inner cavity 203a, the slider 203 completely covers the S port and the C port of the valve seat 202, and the S port and the C port are both communicated with the slider inner cavity 203a, so that the E port can be communicated with the D port through the valve cavity, and the S port can be communicated with the C port through the slider inner cavity 203 a.

That is, the slider cavity 203a has a third projection on the plane of the upper surface of the valve seat 202, the third projection covers at least part of the S port, the third projection covers at least part of the C port, and the third projection does not cover the E port.

first, the third projection (section line in the figure) of the slider cavity 203a completely covers the S-port and the C-port, as shown in fig. 22 a;

second, the third projection (section line in the figure) of the inner cavity 203a of the slider completely covers the interface C and partially covers the interface S, as shown in fig. 22 b;

third, the third projection (section line in the figure) of the inner cavity 203a of the slider completely covers the S-port and partially covers the C-port, as shown in fig. 22C;

fourth, the third projection (section line) of the slider cavity 203a partially covers the S-port and partially covers the C-port, as shown in fig. 22 d.

In order to ensure that the inner cavity of the slider 203 can communicate with the E port, the S port, and the C port when the slider 203 is in the second working position, the length of the slider 203 should be greater than the sum of the radius of the E port, the distance between the E port and the S port, the distance between the S port and the C port, and the radius of the C port.

Referring to fig. 16a, 16b and 16c, fig. 16a, 16b and 16c respectively show the first working position, the second working position and the third working position of the slider in the first embodiment of the valve seat and slider matching structure.

As shown in fig. 16b, the length L2 of the slider 203 satisfies:

L2＞(D1)/2+L12+L23+(D3)/2；

d1 is the diameter of the E interface, L12 is the distance between the E interface and the S interface, L23 is the distance between the S interface and the C interface, and D3 is the diameter of the C interface.

As shown in fig. 16a, in this example, when the slider 203 is in the first working position, the E-site and the S-site are completely located within the inner cavity of the slider 203, that is, when the distance between the first cavity sidewall 231 and the second cavity sidewall 232 of the inner cavity of the slider 203 is at least equal to the sum of the radius of the E-site, the distance between the E-site and the S-site, and the radius of the S-site. By the arrangement, the flow resistance of the refrigerant flowing through the E connector and the S connector under the working position can be reduced, and the pressure loss is reduced.

Further, in the first working position, the area of the sliding block 203 covering the C port is not more than half of the flow area of the C port, as shown in the figure, that is, in the radial direction of the C port, the length L02 of the sliding block 203 covering the C port is not more than the radius (D3)/2 of the C port, so that the flow resistance of the refrigerant flowing through the C port at the working position can also be reduced, and the pressure loss can be reduced.

In this example, as shown in fig. 16C, when the slider 203 is in the third working position, the S-junction and the C-junction are completely located within the inner cavity of the slider 203, that is, when the distance between the first cavity sidewall 231 and the second cavity sidewall 232 of the inner cavity of the slider 203 is at least equal to the sum of the radius of the S-junction, the distance between the S-junction and the C-junction, and the radius of the C-junction. By the arrangement, the flow resistance of the refrigerant flowing through the S connector and the C connector under the working position can be reduced, and the pressure loss is reduced.

Furthermore, in the third working position, the area of the sliding block 203 covering the E port is not more than half of the flow area of the E port, as shown in the figure, that is, in the radial direction of the E port, the length L03 of the sliding block 203 covering the E port is not more than (D1)/2, so that the flow resistance of the refrigerant flowing through the E port at the working position can be reduced, and the pressure loss can be reduced.

Specifically, for convenience of arrangement, the structure of the slider 203 is symmetrically arranged, and meanwhile, the paths such as the E interface, the S interface and the C interface are arranged, and the distance between the E interface and the S interface is the same as the distance between the S interface and the C interface, that is, D1 is D3, and L12 is L23, it can be understood that, after the arrangement, L02 is L03.

In this example, as shown in fig. 16b, the slider 203 is in the second working position, and the area of the slider 203 covering the C-port is greater than half of the flow area of the C-port, so as to illustrate that, in the radial direction of the C-port, the length L01 of the slider 203 covering the C-port is greater than (D3)/2, and the area of the slider 203 covering the E-port is also greater than half of the flow area of the E-port.

It is understood that, in other examples, in order to reduce the flow resistance of the refrigerant in the second working position, the area of the slider 203 covering the C port may be set to be at least not larger than half of the flow area of the C port, and/or the area of the slider 203 covering the E port may be at least not larger than half of the flow area of the E port.

Referring to fig. 17a, 17b and 17c, fig. 17a, 17b and 17c respectively show the first working position, the second working position and the third working position of the slider in the first embodiment of the valve seat and slider matching structure.

Likewise, in this example, the length L2 of the slider 203 satisfies:

L2＞(D1)/2+L12+L23+(D3)/2；

For convenience, the structure of the slider 203 in this example is also symmetrically arranged, and D1 is D3, L12 is L23, and the diameter of the S port is also arranged as the E port and the C port.

As shown in fig. 17a, in this example, when the slider 203 is in the first working position, the E port and the S port are completely located within the inner cavity of the slider 203. By the arrangement, the flow resistance of the refrigerant flowing through the E connector and the S connector under the working position can be reduced, and the pressure loss is reduced.

In the example shown in fig. 17b, the slider 203 is in the second working position, and in the radial direction of the C port, the length L01 of the slider 203 covering the C port is smaller than the radius (D3)/2 of the C port, and the length of the slider 203 covering the E port is also smaller than the radius of the E port. By the arrangement, the flow resistance of the refrigerant under the second working position can be reduced, and the pressure loss is reduced.

In this example, as shown in fig. 17C, when the slider 203 is in the third working position, the S-port and the C-port are completely located within the inner cavity of the slider 203. By the arrangement, the flow resistance of the refrigerant flowing through the S connector and the C connector at the working position can be reduced, and the pressure loss is reduced.

In the illustrated scheme, in the first working position, in the radial direction of the C port, the length L02 of the sliding block 203 covering the C port is greater than the radius of the C port; in the third working position, in the radial direction of the E-port, the length L03 of the slide block 203 covering the E-port is greater than the radius of the E-port.

It can be understood that, in other examples, the first working position may be further configured such that, on the basis that the inner cavity of the slider 203 completely covers the E-port and the S-port, the area of the slider 203 covering the C-port is not larger than half of the flow area of the C-port, so as to reduce the flow resistance of the refrigerant flowing through the C-port in the first working position; meanwhile, in the third working position, on the basis that the inner cavity of the sliding block 203 completely covers the interface S and the interface C, the area of the sliding block 203 covering the interface E is not more than half of the flow area of the interface E, so that the flow resistance of the refrigerant flowing through the interface E in the working position is reduced.

Referring to fig. 18a, 18b and 18c, fig. 18a, 18b and 18c respectively show the first working position, the second working position and the third working position of the slider in the first embodiment of the valve seat and slider matching structure.

Likewise, in this example, the length L2 of the slider 203 satisfies:

L2＞(D1)/2+L12+L23+(D3)/2；

As shown in fig. 18a, in this example, when the slider 203 is in the first working position, the E-port and the S-port are completely located within the inner cavity of the slider 203. By the arrangement, the flow resistance of the refrigerant flowing through the E connector and the S connector under the working position can be reduced, and the pressure loss is reduced.

Meanwhile, in the radial direction of the C interface, the length L02 of the sliding block 203 covering the C interface is smaller than the radius (D3)/2 of the C interface, so that the flow resistance of the refrigerant flowing through the C interface at the working position can be reduced, and the pressure loss is reduced.

As shown in fig. 18b, in this example, the sliding block 203 is in the second working position, and the E port, the S port, and the C port are all completely located within the inner cavity of the sliding block 203. With the arrangement, the flow resistance of the refrigerant is the minimum in the second working position.

On the basis of satisfying the condition, in order to make the size of the slider 203 smaller so that the connecting assembly 204 can slide along the slider, the distance L21 between the first cavity side wall 231 and the second cavity side wall 232 of the slider 203, i.e. the length of the inner cavity of the slider 203 in the axial direction of the valve body component is equal to (D1)/2+ L12+ L23+ (D3)/2.

In this example, as shown in fig. 18C, when the slider 203 is in the third working position, the S-port and the C-port are completely located within the inner cavity of the slider 203. By the arrangement, the flow resistance of the refrigerant flowing through the S connector and the C connector under the working position can be reduced, and the pressure loss is reduced.

Meanwhile, in the radial direction of the E interface, the length L03 of the sliding block 203 covering the E interface is smaller than the radius (D1)/2 of the E interface, so that the flow resistance of the refrigerant flowing through the C interface at the working position can be reduced, and the pressure loss is reduced.

Further, to reduce the size of the valve seat 202 and simplify the structure, on the basis of satisfying the above conditions, as shown in fig. 18a, when the slider 203 is in the first working position, the axial distance between the sidewall of the valve seat 202 close to the E-junction and the first cavity sidewall 231 of the inner cavity of the slider 203 is greater than zero, and as shown in fig. 18C, when the slider 203 is in the third working position, the axial distance between the sidewall of the valve seat 202 close to the C-junction and the second cavity sidewall 232 of the inner cavity of the slider 203 is greater than zero.

Referring to fig. 19, fig. 19 is a schematic structural diagram of another embodiment of the electromagnetic switching valve provided in the present invention.

The electromagnetic switching valve shown in fig. 19 is basically consistent with the operation principle and the main structure of the electromagnetic switching valve shown in fig. 5 to 7, and the difference between the two is that: in this embodiment, the second pilot valve member 207 of the solenoid-operated switching valve is provided at a different position, and only this difference will be described in detail below, and other configurations will be understood with reference to the foregoing description.

In this embodiment, as shown in fig. 19, a connection port communicating with the main valve chamber Q4 is opened on the second valve body 212, the second pilot valve sleeve 271 of the second pilot valve member 207 is fixedly connected with the second valve body 212, and the second sleeve chamber of the second pilot valve sleeve 271 directly communicates with the connection port, compared with fig. 5-7, in this solution, the second sleeve chamber directly communicates with the main valve chamber Q4, and the capillary d2 can be omitted.

In this example, the first valve body 211 is provided on the right side of the second valve body 212, and in the example shown in fig. 5 to 7, the first valve body 211 is provided on the left side of the second valve body 212.

The electromagnetic switching valve and the refrigeration system with the same 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. The electromagnetic switching valve is characterized by comprising a valve body part, a first pilot valve part and a second pilot valve part;

2. The electromagnetic switching valve according to claim 1, wherein the first valve body has a large diameter chamber, the second valve body has a small diameter chamber, and a radius of the large diameter chamber and a radius of the small diameter chamber satisfy the following condition:

π(R1²-R2²)ΔP＞F_f+F_f’；

wherein R1 is the radius of the large diameter cavity, R2 is the radius of the small diameter cavity, Δ P is the minimum operating pressure difference of the system, F_fIs the friction of the connecting-rod assembly, F_f' is the friction of the slider.

3. The electromagnetic switching valve according to claim 1, further comprising a second end cap for closing off an opening of the second valve body; the first valve body and the second valve body are of cylindrical structures, the first valve body and the second valve body are fixedly connected, and inner cavities of the first valve body and the second valve body are communicated; the electromagnetic switching valve is located at the third working position, and the second piston part is abutted against the second end cover.

4. The electromagnetic switching valve according to claim 3, wherein the first valve body and the second valve body are fixedly connected by an adapter having a through hole, the adapter includes a first step portion and a second step portion, the first step portion has a first step surface facing the first valve body, the first valve body is fixedly sleeved on the first step portion and abuts against the first step surface, the second step portion has a second step surface facing the second valve body, and the second valve body is fixedly sleeved on the second step portion and abuts against the second step surface;

wherein the stopper portion includes the first stepped portion.

5. The electromagnetic switching valve according to claim 3, wherein the first valve body includes a body portion and a connecting portion, a diameter of the connecting portion is smaller than a diameter of the body portion, the second valve body is fixedly fitted to the connecting portion, and the stopper portion includes the connecting portion.

6. The electromagnetic switching valve according to claim 4 or 5, wherein the partition includes a piston bowl, an outer peripheral wall of the piston bowl is in sliding seal with an inner peripheral wall of the first valve body, and an opening of the piston bowl faces the first end cover;

or, the isolating part comprises an isolating block and a sealing ring, and the isolating block is sealed with the first valve body through the sealing ring.

7. The electromagnetic switching valve according to claim 3, wherein the first valve body and the second valve body are fixedly connected by an adapter having a through hole, the adapter includes a first step portion and a second step portion, the first step portion has a first step surface facing the first valve body, the first valve body is fixedly sleeved on the first step portion and abuts against the first step surface, the second step portion has a second step surface facing the second valve body, and the second valve body is fixedly sleeved on the second step portion and abuts against the second step surface;

the adapter further comprises an axial projection extending into the first valve body, and the stop portion comprises the axial projection.

8. The electromagnetic switching valve of claim 7, wherein the isolation portion comprises two piston bowls that are fixedly connected and arranged in a back-to-back manner; the diameter of the axial projection is smaller than the inner diameter of the piston bowl.

9. The electromagnetic switching valve according to any one of claims 1 to 5 and 7 to 8, wherein the spacer portion and the stopper portion are fixedly connected by a connecting rod, and the stopper portion is capable of restricting a sliding position of the slider when the slider slides toward the side where the slider is located.

10. The refrigerating system comprises a compressor, an indoor heat exchanger and a four-way valve, wherein an inlet of the compressor is communicated with an S port of the four-way valve; the outdoor heat exchanger is characterized by further comprising an electromagnetic switching valve, a first outdoor heat exchanger and a second outdoor heat exchanger, wherein the electromagnetic switching valve is the electromagnetic switching valve according to any one of claims 1 to 9;

and the second branch is also provided with a flow regulating valve.