CN107975602B

CN107975602B - Flow control device

Info

Publication number: CN107975602B
Application number: CN201610916254.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2016-10-21
Filing date: 2016-10-21
Publication date: 2021-10-15
Anticipated expiration: 2036-10-21
Also published as: CN107975602A

Abstract

The invention discloses a flow control device, which comprises a valve body, a first valve seat, a second valve seat and a valve core, wherein the valve body comprises a first communicating hole, a second communicating hole, a first valve port and a first cavity, the first valve seat is arranged in the first cavity, the first valve seat can slide relative to the second valve seat, the first valve seat is provided with the second valve port, when the flow control device is positioned at a first working position, the first valve seat closes the first valve port, the valve core can adjust the opening size of the second valve port, when the flow control device is positioned at a second working position, the first valve port is opened by the first valve seat, and the second communicating hole is communicated with the first communicating hole through the first cavity.

Description

Flow control device

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of fluid control, in particular to a flow control device.

[ background of the invention ]

Flow control devices, particularly electrically controllable flow control devices, are becoming more and more widely used. If the electronic expansion valve is one of the flow control devices, the electronic expansion valve with the one-way function can improve the efficiency of the air conditioning system, so that the electronic expansion valve is more and more widely applied to the air conditioning system, and particularly the application of the electronic expansion valve to the air conditioner of the new energy electric vehicle is gradually enhanced. The electronic expansion valve with one-way function generally has a complex structure and high assembly requirements, so that the prior art needs to be improved to solve the technical problems.

[ summary of the invention ]

It is an object of the present invention to provide a flow control device of relatively simple construction.

In order to realize the purpose, the following technical scheme is adopted:

a flow control device includes a valve body including a first communication hole, a second communication hole, a first chamber, and a first valve port, the first communication hole communicating with the first chamber, the second communication hole being capable of communicating with the first chamber through the first valve port opened when the first valve port is communicated, a first valve seat including a second valve port, and a valve element disposed opposite to the second valve port,

the flow control device comprises a guide part, the guide part extends into the first valve seat or the first valve seat extends into the guide part, and the first valve seat can slide relatively along the guide part to enable the first valve seat to at least comprise a first working position and a second working position; the flow control device also comprises a second cavity, the valve core is at least partially positioned in the second cavity, the second cavity is communicated with the first cavity, and when the second valve port is communicated, the second cavity can be communicated with the second communication hole through the opened second valve port;

when the first valve seat is located at a first working position, the first valve seat closes the first valve port, the valve core can move relative to the second valve port and can open or close the second valve port or adjust the opening degree of the second valve port; when the first valve seat is located at the second working position, the first valve port is opened by the first valve seat, and the second communication hole is communicated with the first communication hole through the first cavity.

Compared with the prior art, the flow control device has the advantages that the first valve seat capable of sliding along the guide part is arranged, the first valve port is closed and opened, when the first valve port is closed by the first valve seat, the size of the opening of the second valve port is adjusted by the valve core, the throttling and one-way functions of the flow control device are realized, and the structure is relatively simple.

[ description of the drawings ]

FIG. 1 is a schematic perspective view of a flow control device;

FIG. 2 is a schematic cross-sectional view A-A of the flow control device of FIG. 1, particularly illustrating a first operational position of the flow control device;

FIG. 3 is a schematic view of the flow control device of FIG. 1 in a second operating position;

FIG. 4 is a perspective view of an embodiment of a first valve seat;

FIG. 5 is a cross-sectional view B-B of the first valve seat shown in FIG. 4;

FIG. 6 is a schematic view of the second embodiment of the flow control device in a first operating position;

FIG. 7 is a schematic view of the second embodiment of the flow control device in a second operating position;

FIG. 8 is a schematic view of a second embodiment of the flow control device in a first operating position;

FIG. 9 is a schematic view of a second embodiment of the flow control device in a second operating position in accordance with the second embodiment;

FIG. 10 is a schematic structural view of another embodiment of the first valve seat;

FIG. 11 is a schematic view of the third embodiment in a first operating position of the flow control device;

FIG. 12 is a schematic view of the third embodiment in a second operating position of the flow control device.

[ detailed description ] embodiments

Referring to fig. 1, 2 and 3, fig. 2 and 3 are schematic views of two working positions of a first embodiment of a flow control device. The flow control device comprises a valve body 1, a first valve seat 2, a valve member 3 and an electronic coil 4, wherein the valve member 3 comprises a second valve seat 31, the second valve seat 31 comprises a guide part 311, the first valve seat 2 is arranged to intersect with the guide part 311, and the first valve seat 2 can slide relatively along the guide part 311. The valve body 1 comprises a first communication hole 11, a second communication hole 12, a first cavity 13 and a first valve port 14, wherein the first communication hole 11 is communicated with the first cavity 13, the second communication hole 12 can be communicated with the first cavity 13 through the opened first valve port 14, and the first communication hole 11 and the second communication hole 12 are both provided with openings communicated with other equipment on the surface of the valve body. Specifically, the side wall forming the first chamber 13 is provided with a first opening 111, a first communication hole is communicated with the first chamber 13 through the first opening 111, the first valve port 14 is provided in the end wall forming the first chamber 13, the second communication hole 12 is communicated with the first chamber 13 through the opened first valve port 14, and the first opening 111 is located above the first valve port 14 in the axial direction of the first chamber. More specifically, the side wall forming the first chamber 13 includes a first side wall 131, a second side wall 132, a first step wall 133, and an end wall 134, the cross-sectional diameter of the space surrounded by the first side wall 131 is larger than the cross-sectional diameter of the space surrounded by the second side wall 132, the first opening 111 is provided in the first side wall 131, the second side wall 132 is adjacent to the first valve port 14 with respect to the first side wall 131, the first step wall 133 is provided between the first side wall and the second side wall, and the first step wall 133 is substantially perpendicular to and connected to the first side wall and the second side wall; the first port 14 is disposed in an end wall 134, and the end wall 134 is adjacent to a second sidewall opposite the first sidewall. The first communication hole 11 is a rectilinear hole, the axis of which is perpendicular to the axis of the first cavity 13; the second communication hole 12 is a bent hole, the second communication hole 12 comprises two parts, the axis of the first part of the second communication hole 12 is coincident with or parallel to the axis of the first cavity 13 and is communicated with the first valve port 14, the axis of the second part of the second communication hole 12 is perpendicular to the axis of the first cavity, and the second part of the second communication hole 12 is provided with an opening communicated with other equipment on the surface of the valve body; it will be appreciated that the second communication hole 12 may also be a rectilinear hole, the axis of which coincides with or is parallel to the axis of the first chamber. The center of the first valve port 14 is located at the axis of the first chamber 13, and the diameter of the first valve port 14 is smaller than the cross-sectional diameter of the first chamber 13. The flow control device can be communicated with a pipeline of the thermal management system through the first communication hole 11 and the second communication hole 12, so that the flow regulation function of the flow control device is realized, wherein the first communication hole can be used as an inlet or an outlet of a refrigerant and is matched with the inlet or the inlet of the refrigerant, and the second communication hole is used as an outlet or an inlet of the refrigerant.

Referring to fig. 1-5, the first valve seat 2 is disposed in the first chamber 13, and the first valve seat 2 can slide up and down in the first chamber 13. The first valve seat 2 includes a second valve port 21, a receiving hole 22, and a first end 23 and a second end 24, in the sliding direction of the first valve seat, the first end and the second end are located at two ends of the first valve seat 2, wherein the first end 23 faces the guide portion 311, the second end 24 faces the first valve port 14, or the second end 24 is adjacent to the first valve port relative to the first end 23, the second valve port 21 penetrates the second end 24, an opening of the receiving hole 22 is disposed at the first end, the receiving hole 22 is communicated with the second valve port 21, and the cross-sectional diameter of the receiving hole 22 is far larger than the cross-sectional diameter of the second valve port 21. The second port 21 is coaxial with the first port 14, and the cross section of the second port is smaller than that of the first port. The first valve seat can relatively move up and down along the guide part, when the second end part 24 contacts with the end wall 134 forming the first cavity and presses the end wall 134, an end part seal is formed, the first valve seat 2 closes the first valve port 121, and the second communication hole 12 is not communicated with the first cavity 13; and/or the side of the first valve seat 2 contacts the second sidewall 132 to form a wall seal, it is understood that the side of the first valve seat 2 may not contact the second sidewall to form a wall seal. Furthermore, the end wall 134 and/or the second side wall forming the first chamber 13 is provided with a first groove, and a sealing ring is placed in the first groove, so that the sealing effect of the first valve seat on the first valve port can be enhanced.

Referring to fig. 2-5, the valve element 3 further includes a valve core 32, a screw transmission mechanism 33, a rotor 34, a liner, and a position limiter (not shown). The second valve seat 31 is assembled and fixed with the valve body 1, specifically, the valve body 1 includes a mounting wall and a mounting cavity formed by the mounting wall, the second valve seat includes a guide portion 311, a mounting portion 312 and a first through hole, and the mounting portion 312 of the second valve seat is partially inserted into the mounting cavity of the valve body and is fixedly connected with the mounting wall of the valve body. The first through hole is provided in the center of the second valve seat 31, penetrates the second valve seat in the axial direction or the vertical direction of the second valve seat 31, and receives the valve body 32. After the second valve seat 31 is assembled and fixed with the valve body 1, the guiding portion 311 is located in the first chamber 13, or the guiding portion 311 protrudes from the mounting portion 312 of the second valve seat and extends into the first chamber 13. The guide portion 311 includes a second opening 3112 and a third opening 3111, the third opening 3111 is disposed at an end portion of the guide portion, or the third opening is an opening of the first through hole at the end portion of the guide portion; the second opening 3112 penetrates through a side portion of the guide portion, the first through hole communicates with the first cavity 13 through the second opening, the second opening 3112 faces the first opening 111, or the second opening 3112 is disposed opposite to the first opening 111, and two or more second openings 3112 may be provided to increase a communication passage between the first through hole and the first cavity 13, and it can be known that the second opening is far from the first valve port relative to the third opening.

The outer diameter of the guide portion 311 is substantially equal to the diameter of the receiving hole, and when assembled, the guide portion 311 extends into the receiving hole 22 of the first valve seat, the side portion of the guide portion 311 contacts the inner wall of the receiving hole 22, and the first valve seat 2 can slide up and down along the side portion of the guide portion 311, or the guide portion 311 guides the sliding of the first valve seat 2. In the axial direction of the first chamber, when the first valve seat 2 is located at the lowest point, or when the first valve seat 2 contacts with the end wall 134 forming the first chamber, part of the guide portion is still located in the receiving hole, and when the first valve seat is located at the highest point, or when the end wall of the receiving hole 22 contacts with the end portion of the guide portion, the first end portion 23 of the first valve seat is located below the side wall of the second opening relatively far away from the first valve port, or when the first valve seat 2 is located at the highest point, at least part of the second opening communicates with the first chamber. In the axial direction of the first cavity, the guide portion is provided with a stop structure below the second opening, the stop structure of the guide portion can limit the position of the first valve seat, in particular, the stop structure of the guide portion can limit the first valve seat to continue sliding upwards, the stop structure of the guide portion can be a snap ring, correspondingly, the guide portion is provided with a recessed area corresponding to the snap ring, or the guide portion is provided with a protrusion below the second opening, and the protrusion can be an annular protrusion. The flow control device further includes a second chamber 3113, the wall forming the second chamber 3113 including a side wall and an end wall, the side wall forming the second chamber 3113 including a wall of the first through hole and a wall of the receiving hole, the end wall forming the second chamber 3113 including an end wall of the receiving hole, the second chamber 3113 communicating with the first chamber 13 through the second opening. It can be seen that the first valve seat 2 slides relative to the guide portion 311, the volume of the second chamber 3113 changes, and accordingly, the volume of the first chamber 13 also changes along with the sliding of the first valve seat.

The screw transmission mechanism 33 includes a movable portion and a fixed portion, one of the movable portion and the fixed portion is a screw 331, and the other is a nut 332, wherein the movable portion (e.g., the screw) of the screw transmission mechanism is fixedly connected with the rotor 34 and the limiting member, and then the valve core 32 is assembled with the screw 331 to form an assembly. The fitting is assembled and fixed with the nut 332 and the second valve seat 31 in sequence, wherein the second valve seat 31 is fixedly connected with the nut 331, and specifically, the nut can be fixed with the second valve seat through interference fit. In other embodiments, the nut and the screw may be replaced with each other, and in the case of a high control requirement, an adaptor 35 fixed to the valve seat may be additionally provided, so that the adaptor 35 is fixedly connected to the nut 332 and the second valve seat 31, and the stability of the valve element may be further improved. The liner pipe is fixedly connected with the second valve seat, specifically, the liner pipe is fixedly connected with the second valve seat through welding or threaded connection, the second valve seat is fixed with the valve body in a threaded connection mode, the electronic coil 4 is installed with the valve component 3, and the flow control device is further provided with an outer cover for protecting the flow control device, so that the dustproof and waterproof performance is improved.

The electronic coil 4 is electrically connected with a controller or is electrically connected with the controller through a control circuit (not shown), the controller outputs a control signal to be input into the flow control device or outputs a control signal to be input into the flow control device through the control circuit, specifically, a power-off signal or a power-on signal or an opening adjusting signal can be input into the electronic coil 4, when the electronic coil is electrified, the rotor rotates under the action of electromagnetic force, due to the action of a thread pitch, the screw rotates and moves up and down relative to the nut under the driving of the rotor, the valve core can act for a certain number of steps according to the opening adjusting signal, the valve core 32 is relatively fixed on the screw, and when the screw and the screw are not influenced by external force, the valve core 32 acts up and down along with the screw, so that the valve core acts relative to the first valve seat or the valve body, and particularly acts relative to the second valve opening. An elastic part is arranged between the valve core and the screw rod, and certain relative displacement can be realized between the valve core and the screw rod in the axial direction and the radial direction perpendicular to the axial direction, so that the buffer effect is realized, and the motion stability of the valve core is improved.

Referring to fig. 2 and 3, the valve element 32 includes a neck portion 321 and a fixing portion 322, the neck portion 321 is located at one end of the valve element, the fixing portion 322 is located at the other end of the valve element, specifically, the neck portion 321 of the valve element is located at the lower end of the valve element, and the fixing portion 322 is located at the upper end of the valve element. The neck 321 of the valve core is engaged with the second port 21, and the neck of the valve core can extend into the second port 21 to adjust the flow rate of the refrigerant passing through the second port 21. In this specification, the neck 321 of the valve element is used as a matching mechanism with the second valve port, and is used for opening or closing the second valve port, the neck 321 of the valve element opens or closes the second valve port 21 through the action of the valve element 32, the neck 321 of the valve element can close the second valve port 21 when located at the second valve port 21, and the neck of the valve element can open the second valve port when leaving the second valve port; the fixing portion 322 of the valve core is fixedly connected with the screw. The neck part and the fixing part of the valve core can be integrally connected through arranging the connecting section, and in other embodiments, the neck part and the fixing part of the valve core can also be fixed together through assembling.

When the refrigerant flows in the forward direction, the area on one side of the first communicating hole 11 is a high-pressure area, the area on one side of the second communicating hole 12 is a low-pressure area, the first valve seat 2 moves downwards to close the first valve port under the action of the pressure difference of the refrigerant, on the basis, the refrigerant enters the second cavity through the second opening, when the valve core 32 opens the second valve port, the refrigerant passes through the second valve port to enter the first valve port and then enter one side of the second communicating hole, in the process, the valve core can reciprocate along the screw rod in the axial direction, so that the opening degree of the second valve port is adjusted, and the purpose of flow adjustment of the flow control device is achieved. When the refrigerant flows reversely, namely the area on one side of the second communication hole is a high-pressure area, the area on one side of the first communication hole is a low-pressure area, under the action of the pressure difference of the refrigerant, the first valve seat 2 moves upwards to open the first valve port 14, the refrigerant enters the first cavity 13 through the first valve port 14 and then enters the first communication hole 11 through the first opening, and therefore the purpose of one-way conduction is achieved. In addition, the first cavity 13 is communicated with the second cavity 3113 through the second opening 3112, and the second opening 3112 maintains the communication between the first communication hole 11 and the second cavity 3113, which is beneficial to maintaining the pressure balance between the upper side and the lower side of the first valve seat. In this description, the end of the first valve seat 2 relatively adjacent to the first valve port, when in contact with the end wall forming the first chamber, is set to the first working position of the first valve seat 2, and accordingly, the first working position of the first valve seat is the first working position of the flow control device; when the first valve seat is at the relatively highest point, it is set to the second working position of the first valve seat 2, and correspondingly, the second working position of the first valve seat is the second working position of the flow control device.

The internal diameter of the receiving hole 22 of the first valve seat is approximately equal to the external diameter of the guide portion 311, the external diameter of the first valve seat 2 is approximately equal to the internal diameter of the first cavity 13 surrounded by the second side wall, the first valve seat slides up and down, the guide portion 311 and the second side wall 132 have a guiding effect on the first valve seat 2, when the first valve seat 2 bears the lateral pressure of a high-pressure refrigerant, the guide portion 311 and the second side wall 132 can prevent the first valve seat 2 from being eccentric, so that internal leakage is avoided, and the reliability of system operation is ensured. It is understood that the side wall forming the first chamber may also be a continuous side wall, that is, the first side wall 131 and the second side wall 132 have the same diameter, the first valve seat 2 is always in contact with the side wall forming the first chamber during up and down sliding, when the first valve seat is located at the highest point, the second end 24 of the first valve seat 2 is located above the side wall of the first opening relatively adjacent to the first valve port, and the first chamber 13 can communicate with the first communication hole through the first opening. In addition, the first step wall 133 may be disposed obliquely relative to the first side wall and the second side wall, and the first step wall plays a role in guiding the first valve seat when moving downward, and may also effectively prevent the first valve seat 2 from generating large eccentricity when being impacted; when the refrigerant reversely flows, the first step wall which is relatively inclined can play a role in guiding the refrigerant.

Referring to fig. 6 and 7, fig. 6 and 7 are schematic views of a second embodiment of the flow control device, wherein, with respect to the first embodiment, the following description mainly refers to differences. The flow control device further comprises an elastic element 5, the elastic element comprises a first end, a second end, a through hole located in the center of the elastic element and a flow passage arranged on the side of the elastic element, the valve core 32 penetrates through the through hole in the center of the elastic element 5, the elastic element 5 can be an elastic device such as a spring or a corrugated pipe, and when the elastic element is the corrugated pipe, a plurality of openings need to be arranged on the side of the corrugated pipe, so that the corrugated pipe can flow inside and outside. The elastic element 5 is disposed in the second cavity 3113, wherein a first end of the elastic element 5 is fixed to the end wall of the accommodating hole 22, and a second end of the elastic element 5 is fixed to the adaptor 35. In other embodiments, the flow control device does not include the adaptor 35, the second valve seat includes an elastic member fixing portion disposed at the first through hole for fixing the second end of the elastic member, the elastic member fixing portion may be a snap ring, and accordingly, the inner wall of the first through hole is provided with a groove for mounting the snap ring, or the inner wall of the first through hole is provided with a protrusion, which in this embodiment is an annular protrusion. Furthermore, the end wall of the accommodating hole and/or the elastic element fixing part or the adaptor are/is provided with a second groove, the second groove is approximately annular, the second groove is matched and installed with the first end part and the second end part of the elastic element, when the flow control device works, the elastic element 5 can be prevented from radially sliding relative to the end wall of the accommodating hole, the radial stress of the first valve seat 5 is uneven, the first valve seat 5 is prevented from being eccentric, internal leakage is avoided, and the working reliability of the system is ensured. In other embodiments, first valve seat 5 sets up first foraminiferous boss, adaptor or elastic element fixed part set up the foraminiferous boss of second, case 32 passes first foraminiferous boss and the foraminiferous boss of second, the external diameter of first foraminiferous boss and the foraminiferous boss of second is roughly equal to the elastic element internal diameter, the both ends of elastic element 5 are embedded respectively to first foraminiferous boss and the foraminiferous boss of second, prevent elastic element sideslip, and then prevent that first valve seat 2 radial atress is uneven, avoid the edge leakage. The flow control device is provided with an elastic element between the second valve seat and the first valve seat, and when the refrigerant flows in the forward direction, the first valve seat 2 can effectively move downwards under the action of the elastic force of the elastic element, so that the sensitivity of the first valve seat 2 is improved; when the first valve seat 2 contacts with the end wall forming the first cavity 13, the elastic element 5 can also enhance the pressure of the first valve seat on the end wall forming the first cavity, and improve the sealing of the first valve seat 2 on the first valve port 14; when the refrigerant reversely flows, the first valve seat 2 moves upwards under the pressure difference of the refrigerant and simultaneously impacts the valve core, and the elastic element is arranged to effectively reduce the impact of the first valve seat 2 on the valve core 32 and effectively prolong the service life of the flow control device.

Referring to fig. 8-10, fig. 8-10 illustrate another embodiment of a second embodiment of a flow control device. The side portion of the first valve seat 2 includes a third side wall 251, a second step wall 252 and a fourth side wall 253, the third side wall 251 is located above the second step wall 252, the fourth side wall 253 is located below the second step wall 252, wherein the cross section of the space enclosed by the third side wall 251 is smaller than that of the space enclosed by the fourth side wall 253, and when the second end portion 24 of the first valve seat 2 contacts the end wall forming the first cavity, the fourth side wall 253 contacts the second side wall 132, or the cross section of the space enclosed by the fourth side wall is substantially the same as that of the space enclosed by the second side wall. It will be appreciated that the fourth side wall and the second side wall can form a wall seal when the first valve seat 2 is in contact with the end wall forming the first chamber. The elastic element 5 is arranged in the first cavity 13, and the guide part 311 and the first valve seat 2 pass through the through hole of the central part of the elastic element 5, wherein the second end of the elastic element 5 is fixed with the lower side part of the mounting part, specifically, the second end of the elastic element 5 and the mounting part are fixed relatively adjacent to the side part of the guide part, and the first end of the elastic element 5 and the second step wall 252 of the first valve seat are fixed; it can be known that the lower side portion of the mounting portion of the second valve seat is provided with a second groove for placing the elastic element, and the outer diameter of the third side wall is substantially equal to the inner diameter of the elastic element, so that the radial movement of the elastic element can be prevented, and the side leakage caused by uneven stress of the first valve seat 2 can be prevented. It is understood that the first valve seat may not be provided with the second step wall, that is, the diameters of the cross sections of the spaces surrounded by the third side wall and the fourth side wall are the same, in this case, the second end of the elastic element 5 is fixed to the first end portion 23 of the first valve seat 2, the first end of the elastic element 5 is fixed to the side portion of the mounting portion of the second valve seat, which is relatively adjacent to the guide portion, only the guide portion is provided in the through hole of the center portion of the elastic element, and in this embodiment, the diameter of the through hole of the center portion of the elastic element is substantially equal to the outer diameter of the guide portion.

Referring to fig. 10, 11 and 12, compared with another embodiment of the second embodiment, the diameter of the cross section of the space surrounded by the third sidewall 251 of the first valve seat is substantially equal to the diameter of the cross section of the first cavity 13, the first valve seat 2 extends into the first through hole 3113, and the first valve seat 2 slides along the inner wall of the first through hole 3113. The diameter of the cross section of the space surrounded by the fourth sidewall 253 is greater than or equal to the outer diameter of the guide portion 311, the diameter of the cross section of the space surrounded by the fourth sidewall 253 is substantially equal to the diameter of the cross section of the space surrounded by the second sidewall 152, the fourth sidewall 253 can slide along the second sidewall 152, when the first valve seat 2 is located at the first working position, the first valve seat 2 is in contact with the end wall forming the first cavity and the second sidewall 152, and the first valve seat 2 can relatively close the first valve port 14; in the process that the first valve seat 2 moves upwards, the inner wall and the second side wall of the first through hole guide the first valve seat 2; when the first valve seat 2 is in the second operating position, the second step wall 252 is in contact with the end of the guide portion, and at least a portion of the first opening is located above the first end. In this embodiment, the side wall forming the second cavity includes an inner wall of the first through hole and an inner wall of the accommodation hole, and the end wall forming the second cavity includes a first end portion and an end wall of the accommodation hole.

In other embodiments, the first valve seat 2 may not include the receiving hole 22, the second valve port 21 penetrates through the first valve seat 2, and the first end 23 of the first valve seat is an end wall forming the second cavity; it is noted that the flow control device may further include an elastic member 5, the first valve seat 2 and the guide portion 311 pass through a central portion through hole of the elastic member 5, a first end of the elastic member 5 is fixed to the second step wall, and a second end of the elastic member 5 is fixed to a mounting portion of the second valve seat. Similarly, the elastic element 5 may be disposed in the second chamber, the valve core 32 passes through a through hole in the central portion of the elastic element 5, the second end of the elastic element 5 is fixed to the adaptor, and the first end of the elastic element 5 is fixed to the first end portion 23 of the first valve seat 2. In this embodiment, the side wall forming the second chamber comprises the inner wall of the first through hole and the end wall forming the second chamber comprises the first end 23 of the first valve seat. Part of the first valve seat 2 extends into the guide part 311, so that the lateral pressure of the refrigerant to the first valve seat can be relatively reduced, the side leakage is favorably reduced, and the stability of the system is improved.

Compared with the prior art, the flow control device is provided with the first valve seat, the first valve seat can slide up and down along the guide part to further close and open the first valve port, when the first valve port is closed by the first valve seat, the opening size of the second valve port is adjusted by the valve core to realize the flow control function, when the first valve port is opened by the first valve seat, the one-way function is realized, and the elastic element can be arranged between the first valve seat and the second valve seat to enhance the stability of the flow control device.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various combinations, modifications and equivalents of the present invention can be made by those skilled in the art, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are encompassed by the claims of the present invention.

Claims

1. A flow control device includes a valve body including a first communication hole, a second communication hole, a first chamber, and a first valve port, the first communication hole communicating with the first chamber, the second communication hole being capable of communicating with the first chamber through the first valve port opened when the first valve port is communicated, a first valve seat including a second valve port, and a valve element disposed opposite to the second valve port,

2. The flow control device of claim 1, wherein the flow control device includes a second valve seat including the guide portion and a first throughbore extending through the guide portion,

the second valve port penetrates through the first valve seat, and the first valve seat at least partially extends into the first through hole;

or the first valve seat further comprises a receiving hole, the receiving hole is opened towards the guide part, the second valve port penetrates through the opposite end of the open end of the first valve seat, the receiving hole is communicated with the second valve port, and the open end of the first valve seat extends into the first through hole or part of the guide part extends into the receiving hole of the first valve seat.

3. The flow control device of claim 2, wherein the wall forming the second chamber comprises a side wall and an end wall,

the open end of the first valve seat extends into the first through hole, the side wall forming the second cavity comprises the inner wall of the first through hole and the inner wall of the accommodating hole, and the end wall forming the second cavity comprises the end part of the first valve seat relatively far away from the first valve port and the end wall of the accommodating hole;

or a part of the guide part extends into the accommodating hole, the side wall forming the second cavity comprises an inner wall of the first through hole and an inner wall of the accommodating hole, and the end wall forming the second cavity comprises an end wall of the accommodating hole;

or the second valve port penetrates through the first valve seat, part of the first valve seat extends into the first through hole, the side wall forming the second cavity comprises the inner wall of the first through hole, and the end wall forming the second cavity comprises the end part of the first valve seat relatively far away from the first valve port.

4. A flow control device according to any one of claims 1 to 3 wherein the side wall defining the first chamber is provided with a first opening through which the first communication port communicates with the first chamber, the end wall defining the first chamber providing the first valve port;

the guide part comprises at least one second opening, the second opening penetrates through the side part of the guide part, at least part of the second opening is positioned above the first valve seat in the axial direction of the first cavity, and the second cavity is communicated with the first cavity through the second opening;

when the first valve seat is located at a first working position, the end part of the first valve seat, which is relatively adjacent to the first valve port, is in contact with the end wall forming the first cavity, and/or at least part of the side part of the first valve seat is in contact with the side wall forming the first cavity, and the first valve seat closes the first valve port; when the first valve seat is located at the second working position, at least part of the first opening is located below the first valve seat in the axial direction of the first cavity.

5. The flow control device of claim 4, wherein the sidewall forming the first chamber includes a first sidewall, a second sidewall adjacent the first valve port opposite the first sidewall, and a first step wall disposed between the first sidewall and the second sidewall, a cross-sectional diameter of a space enclosed by the first sidewall being greater than a cross-sectional diameter of a space enclosed by the second sidewall, the first opening being disposed in the first sidewall,

the valve body comprises a first recess in the end wall and/or the second side wall of the first chamber.

6. A flow control device according to any of claims 1 to 3 or 5 further comprising a resilient element including a central portion of the through bore and a flow passage provided to a side of the resilient element, the resilient element including a first end and a second end, the first end of the resilient element being fixed to the first valve seat.

7. The flow control device according to claim 6, wherein the side portion of the first valve seat includes a third side wall, a fourth side wall, and a second step wall, the fourth side wall having a cross section with a diameter larger than an outer diameter of the guide portion, the second step wall being provided between the third side wall and the fourth side wall, the first valve seat and the guide portion penetrating through a central portion through hole of the elastic member, a first end of the elastic member being fixed to the second step wall, and a second end of the elastic member being fixed to the second valve seat.

8. The flow control device of claim 6, wherein the resilient member is disposed in the second chamber, the valve element extends through a central portion of the resilient member, the flow control device includes a second valve seat, the second valve seat includes a first through-hole;

the second valve seat comprises an elastic element fixing part which is arranged in the first through hole, or the flow control device comprises an adapter part which is assembled and fixed with the second valve seat, the first end of the elastic element is fixed with the end wall of the accommodating hole of the first valve seat, and the second end of the elastic element is fixed with the elastic element fixing part or the adapter part.

9. A flow control device according to claim 8 wherein the first valve seat is provided with a first apertured boss which extends into the first end of the resilient member and/or the resilient member fixing portion or adaptor is provided with a second apertured boss which extends into the second end of the resilient member.

10. A flow control device according to claim 7 or 8 wherein a second recess is provided in a respective location of the first and/or second valve seats or adaptors, and wherein both ends of the resilient member are provided in respective said second recesses.

11. The flow control device according to claim 10, wherein the guide portion includes at least one second opening, the guide portion is provided with a stopper structure capable of restricting a position of the first valve seat, the stopper structure is provided below the second opening in an axial direction of the first chamber, the stopper structure is a snap ring, the guide portion is provided with a recessed area in which the snap ring is placed, or the stopper structure is a protrusion.

12. A flow control device according to claim 4 further comprising a resilient element including a central portion of the through bore and a flow passage provided to a side of the resilient element, the resilient element including a first end and a second end, the first end of the resilient element being fixed to the first valve seat.