KR20200094213A - Electronic expansion valve - Google Patents

Abstract

A valve base (10), wherein the electromagnetic expansion valve is provided with a valve cavity (1) and a valve port (13) as a valve base (10); Screw shaft 30 and nut 40; As the core assembly 20, the core assembly 20 is fixedly connected to the nut 40 and is movably disposed in the valve cavity 1, and the core assembly 20 has a complete part and an indented part Core assembly (20); As the driving mechanism 50, the driving mechanism 50 includes a rotor 51 and a coil 52, the rotor 51 is connected to the screw shaft 30, and the core assembly 20 is a valve port ( Drive mechanism 50, which is driven by nut 40 towards or away from valve port 13; A sealing member (70) provided between the valve base (10) and the core assembly (20), which is capable of cooperating with a complete part or an indented part; And an outer case 60 having a rotor cavity 2, and when the sealing member 70 is engaged with the complete part, the sealing action of the sealing member 70 is, the rotor cavity 2 and the valve cavity ( 1) causes not to be placed in a communication state, and when the sealing member 70 engages the indented portion, a gap is created between the sealing member 70 and the indented portion, so that the rotor cavity 2 opens the gap. Through the valve cavity 1 to be in communication.

Description

Electronic expansion valve

This application claims the priority of Chinese application No. 201810246495.4, entitled "Electronic Expansion Valve", filed with the Chinese Patent Office on March 23, 2018, the entire disclosure of which is incorporated herein by reference.

Technical field

This application relates to the technical field of cooling control, and specifically to an electromagnetic expansion valve.

Currently, the structure of the electromagnetic expansion valve consists of a driving part (coil and rotor) and a flow adjustment part (nut, screw rod, housing, valve needle, valve seat, valve seat core, connecting pipe and the like), The driving force for opening and closing the valve is formed by a coil driving the rotor. The rotor and coil having specified specifications output a constant driving force. With the increase in the diameter of the valve port, the pressure created in the valve body is greater after the system refrigerant has been upgraded, and the driving force required by the product is greater when the valve is switched from closed to open. Big. On the one hand, this affects the smoothness of the valve opening, and on the other hand, the driving force required by the product needs to be increased by amplifying the coil and in other ways, resulting in an increase in cost.

The main object of the present application is to provide an electromagnetic expansion valve, which can reduce the pressure difference formed inside the valve body, thereby reducing the driving force required by the product and reducing the manufacturing cost of the product.

In order to achieve the above object, an electromagnetic expansion valve, comprising: a valve seat having a valve chamber and a valve port placed in communication with the valve chamber; A valve needle movably arranged in the valve chamber, the valve needle having a closed position for blocking the valve port and an open position for opening the valve port; A housing fixed on the valve seat, the chamber being inside the housing, the housing; A screw rod and nut, located in the chamber, cooperating with the screw rod by a screw rod and a screw, the nut being connected to a valve needle; A drive mechanism comprising a rotor positioned in the chamber and a coil arranged around the outer surface of the housing in the circumferential direction, the rotor being connected to a screw rod, the rotor being driven to rotate the screw rod under driving of the coil, and the nut being screwed Includes a drive mechanism that is movable along the axial direction under the drive of the rod, and that the valve needle is switchable between open and closed positions under the drive of the nut; And an electromagnetic expansion valve, in which a flow passage is formed between the valve needle and the valve seat, is provided according to the present application. The electromagnetic expansion valve further includes a sealing member. When the valve needle is placed in the closed position, the sealing member can close the flow passage, so that the valve chamber is not placed in communication with the chamber. When the valve needle is placed in the open position, the valve chamber is placed in communication with the chamber through the flow passage.

Applying the technical solution of the present application, the chamber pressure inside the valve body is relatively large when the refrigerant enters the valve port when the electromagnetic expansion valve is placed in the valve closed state, that is, when the core assembly abuts against the valve port. , And the core assembly may not abut against the valve port because the refrigerant is too late to relieve pressure, and the pressure in the valve chamber and the pressure in the rotor chamber allows the electromagnetic expansion valve to remain closed. To this end, it can be kept balanced through a sealing cooperation between the sealing member and the complete portion; When the electromagnetic expansion valve is placed in the valve open state, that is, when the core assembly is relatively far from the valve port, when the refrigerant enters the rotor chamber from the valve port, pressure buildup is between the sealing member and the notch portion. Through the cooperation of, due to the fast pressure entry and slow pressure relaxation, it is easy to form, the refrigerant flows through the gap between the sealing member and the notch portion, and the pressure gradually relaxes. Accordingly, whether the electromagnetic expansion valve is in the valve open state or the valve closed state, the pressure difference formed inside the valve body is relatively small. When the valve needs to be opened or closed, the required driving force for the coil is small, which is achieved without increasing the coil and in other ways, thereby reducing manufacturing costs.

The accompanying drawings, which form a part of this application, are used to provide further understanding of the application, and exemplary embodiments and descriptions thereof are used to describe the application. , And do not constitute inappropriate limitations regarding this application. In the drawings:
1 is a schematic longitudinal sectional view showing the structure of an electromagnetic expansion valve according to a first embodiment of the present application, and the core assembly of FIG. 1 is placed in a valve closed state;
FIG. 2 is an enlarged view showing the structure of the electromagnetic expansion valve of FIG. 1 in position A;
3 is a schematic longitudinal cross-sectional view showing the structure of an electromagnetic expansion valve according to a first embodiment of the present application, wherein the core assembly of FIG. 3 is placed in a valve open state;
FIG. 4 is an enlarged view showing the structure of the electromagnetic expansion valve of FIG. 3 in position B;
5 is a perspective view showing the structure of the core assembly of the electromagnetic expansion valve of FIG. 1;
6 is a schematic longitudinal cross-sectional view showing the structure of the core assembly of FIG. 5;
7 is a partial cross-sectional view showing the structure of the electromagnetic expansion valve of FIG. 1, and FIG. 7 shows the sizes of D1, D2, D3 and D4;
8 is a schematic longitudinal cross-sectional view showing the structure of an electromagnetic expansion valve according to a second embodiment of the present application, and the core assembly of FIG. 8 is placed in a valve closed state;
FIG. 9 is an enlarged view showing the structure of the electromagnetic expansion valve of FIG. 8 in position C;
10 is a schematic longitudinal cross-sectional view showing the structure of an electromagnetic expansion valve according to a second embodiment of the present application, wherein the core assembly of FIG. 10 is placed in a valve open state;
FIG. 11 is an enlarged view showing the structure of the electromagnetic expansion valve of FIG. 10 in position D;
12 is a perspective view showing the structure of the core assembly of the electromagnetic expansion valve of FIG. 8; And
13 is a schematic longitudinal cross-sectional view showing the structure of the core assembly of FIG. 12.

It should be understood that the embodiments and features within the embodiments can be combined with each other without collision. The present application will be described in detail below with reference to the drawings and examples.

1 to 6, the electromagnetic expansion valve according to this embodiment, the valve seat 10, the screw rod 30 and the nut 40, the core assembly 20, the driving mechanism 50, It includes a sealing member 70 and a housing 60. The valve seat 10 includes a valve chamber 1 and a valve port 13 placed in communication with the valve chamber 1. The screw rod 30 cooperates with the nut 40 by a screw. The core assembly 20 is fixedly connected to the nut 40. At least a portion of the core assembly 20 is movably arranged in the valve chamber 1. The core assembly 20 has a complete portion and a notched portion, and at least a portion of the complete portion is positioned above the notched portion. The driving mechanism 50 includes a rotor 51 and a coil 52. The rotor 51 is connected to the screw rod 30. The rotor 51 is driven to rotate the screw rod 30 through the coil 52. The nut 40 is movable along the axial direction through screw cooperation with the screw rod 30. The core assembly 20 is driven by a nut 40 to access the valve port 13 or move away from the valve port 13. The sealing member 70 is arranged between the valve seat 10 and the core assembly 20. The sealing member 70 is configured to cooperate with a complete portion or a notched portion. The housing 60 is fixedly connected to the valve seat 10. The housing 60 includes a rotor chamber 2. When the sealing member 70 cooperates with the complete part, the rotor chamber 2 is not placed in communication with the valve chamber 1 through the sealing effect of the sealing member 70. When the sealing member 70 cooperates with the notch portion, a gap is formed between the sealing member 70 and the notch portion, and the rotor chamber 2 is placed in communication with the valve chamber 1 through the gap.

By applying the technical solution of the first embodiment, the refrigerant enters the valve port 13 when the electromagnetic expansion valve is placed in the valve closed state, that is, when the core assembly 20 abuts against the valve port 13. At this time, the chamber pressure inside the valve body is relatively large, and the core assembly 20 may not abut the valve port 13 because the refrigerant is too late to relieve the pressure. The pressure in the valve chamber 1 and the pressure in the rotor chamber 2 can be kept balanced through a sealing cooperation between the sealing member 70 and the complete part, in order to keep the electromagnetic expansion valve closed. have. Pressure build-up when refrigerant enters the rotor chamber 2 from the valve port 13 when the electromagnetic expansion valve is placed in the valve open state, that is, when the core assembly 20 is relatively far from the valve port 13 This is easy to form due to the fast pressure entry and slow pressure relaxation through cooperation between the sealing member 70 and the notch portion, and refrigerant flows through the gap between the sealing member 70 and the notch portion, and The pressure gradually relaxes. Accordingly, whether the electromagnetic expansion valve is in the valve open state or the valve closed state, the pressure difference formed inside the valve body is relatively small. When the valve needs to be opened or closed, the required driving force for the coil is small, which is achieved without increasing the coil and in other ways, thereby reducing manufacturing costs.

When the "complete part" cooperates with the sealing member 70, a gap is not formed between the sealing member 70 and a part of the complete part cooperating with the sealing member 70, so that the valve chamber 1 is It should be noted that it cannot be placed in communication with the rotor chamber 2 through a gap. The shape of the “complete part” is not limited (such as cylindrical, square columnar, and the like) unless a gap is formed between the sealing member 70 and part of the complete part that cooperates with the sealing member 70. Does not. When the “notch portion” cooperates with the sealing member 70, a gap is formed between the sealing member 70 and a portion of the notch portion cooperating with the sealing member 70, so that the valve chamber 1 is described above. The clearance can be placed in communication with the rotor chamber 2. The shape of the “notch portion” is not limited (such as a polygonal columnar shape, or an irregular shape) as long as a gap is formed between the sealing member 70 and a portion of the notch portion that cooperates with the sealing member 70.

The notched portion cooperates with the sealing member 70, where the meaning of “cooperate” does not necessarily mean contact cooperation, and also, the notched portion is in a corresponding state with the sealing member 70 (without contact), And, it should be noted that it can mean that a gap is formed between the outer wall of the notch portion and the inside of the sealing member 70.

1 to 6, in the first embodiment, the flow grooves 24 are arranged on the outer wall of the core assembly 20. The notched portion is formed on the shaft section of the core assembly 20 where the flow grooves 24 are located, and the complete portion is formed on the remaining shaft section portion of the core assembly 20. Specifically, when the core assembly 20 moves downward with the valve closed, the sealing member 70 is located above the flow groove 24, and the sealing member 70 can perform the function of sealing and isolation. Thus, the inner surface of the sealing member 70 is fitted to the outer wall of the core assembly 20, and the outer surface of the sealing member 70 is fitted to the inner wall of the valve seat 10, so that the valve chamber 1 is, It is not placed in communication with the rotor chamber 2. When the core assembly 20 moves upward in the valve open state, the sealing member 70 is placed in correspondence with the flow groove 24, so that the gap is formed between the inner surface of the sealing member 70 and the flow groove 24 ) Is formed between the bottom of the groove. The refrigerant in the valve chamber 1 can enter the rotor chamber 2 from the above-described clearance, and the refrigerant in the rotor chamber 2 can also enter the valve chamber 1 from the above-described clearance, and thus The pressure in the valve chamber 1 and the pressure in the rotor chamber 2 are quickly balanced. Additionally, by arranging the grooves to achieve the above object, the structure is simple, the processing is convenient and the cost is low.

1, 3, 5 and 6, in the first embodiment, the flow grooves 24 are elongated grooves extending in the axial direction of the core assembly 20. The above structure is simple and convenient to process. Preferably, in the first embodiment, the flow grooves 24 are elongated grooves extending in the axial direction of the core assembly 20. The above structure is simple and convenient to process.

5 and 6, in the first embodiment, the upper end of the flow groove 24 is spaced a predetermined distance from one end of the core assembly 20 close to the valve port 13, and It is spaced a predetermined distance from one end of the core assembly 20 away from the valve port 13.

5 and 6, in the first embodiment, the core assembly 20 includes a first core section 21 fixedly connected to the nut 40 and under the first core section 21 It has a second core section 22 located at. The outer diameter of the second core section 22 is larger than the outer diameter of the first core section 21. The sealing member 70 is located between the first core section 21 and the valve seat 10. The above structure is simple, and the outer diameter of the second core section 22 is larger than the diameter of the valve port 13, so that the core assembly 20 can block the valve port 13.

1 to 4, in the first embodiment, a stepped surface 25 is formed at the engaging portion between the first core section 21 and the second core section 22. The first stop structure 90 is arranged on the valve seat 10. And, the lower surface of the first stop structure 90 can abut against the stepped surface 25 and can cooperate with the stepped surface 25. The above structure can limit the moving position of the core assembly 20 to ensure that the valve opening and valve closing of the electromagnetic expansion valve are more efficient (with high efficiency) and the core assembly 20 The upward stroke of can be fixed. The first stop structure 90 is a lower stop ring.

1 to 4, in the first embodiment, the protrusion 41 is arranged on the nut 40, and the second stop structure 100 is located above the first stop structure 90 ) Is arranged on the valve seat 10. The upper surface of the second stop structure 100 can abut against the lower surface of the protrusion 41 and can cooperate with the lower surface of the protrusion 41. The above-described structure can limit the moving position of the core assembly 20 and fix the downward stroke of the core assembly 20. Preferably, in the first embodiment, when the second stop structure 100 abuts against the nut 40 and cooperates with the nut 40, the core assembly 20 is located at the lower stop point. The above structure prevents the abutting force between the core assembly 20 of the electromagnetic expansion valve and the valve port 13 from being too large, thereby ensuring the life of the core assembly 20.

1 to 4, in the first embodiment, the first stop structure 90 is a lower stop ring, and the second stop structure 100 is an upper stop ring. The sealing member 70 is a sealing ring. The sealing ring is clamped between the first stop structure 90 and the second stop structure 100, and the core assembly 20 is inserted into the upper stop ring, the lower stop ring and the sealing ring. The above structure is simple and convenient for fixing the sealing ring.

1 to 4, in the first embodiment, the projections 41 are arranged on the nut 40. The electromagnetic expansion valve further includes a support portion 80 that is fixedly arranged on the valve seat 10, and a position-limiting groove 81 is arranged on the support portion 80. The protrusion 41 can be mated with the position-limiting groove 81. When the nut 40 tends to rotate in the circumferential direction, the position-restricting groove 81 can block the side wall of the protrusion 41, so the nut 40 cannot rotate in the circumferential direction. The above structure is simple and easy to implement. Additionally, when the lower surface of the protruding portion 41 abuts against the upper surface of the upper stop ring, the core assembly 20 can lower the core assembly 20 from moving downwards, which is the lower stop. It is located at the point (it cannot continue moving down). The protrusion 41 has two functions at the same time, to realize the maximum utilization of the structure, to avoid the design of the new structure, and to reduce the manufacturing cost.

When the core assembly 20 is positioned at the lower stop point, the distal end of the core assembly will be able to abut directly against the valve port 13.

As shown in Fig. 1, in the first embodiment, the support portion 80 is cup-shaped, and an upwardly extending opening is arranged on the bottom portion of the support portion 80, and the opening is a position-limiting groove (81) is formed. Specifically, when the nut 40 tends to rotate along the axis of the nut, the side wall of the position-restricting groove 81 can block the side wall of the protrusion 41, so the nut 40 can It cannot rotate along an axis. The above structure is simple, easy to implement, and has a low cost.

Preferably, when the upper surface of the protrusion 41 abuts against the upper surface of the position-limiting groove 81, the core assembly 20 is positioned at the upper stop point (it cannot continue moving upward).

1 to 4, in the first embodiment, the screw rod 30 is fixed to the rotor 51, and the rotor 51 and the screw rod 30, by the support 80 Is supported. The elastic element 110 is arranged between the support 80 and the nut 40. The elastic element 110 can apply a downward force on the nut 40 to prevent the nut 40 from moving upward.

1 to 4, in the first embodiment, the valve seat 10 includes a valve seat body 11 and a connection seat 12, which is fixed to the valve seat body 11 . The valve chamber 1 is formed inside the connection seat 12 and the valve seat body 11. The valve port 13 is arranged in the valve seat body 11. The mounting holes 121 are arranged in the connecting sheet 12. The mounting hole 121 has a mounting section and a guide section, which has a larger opening than the mounting section and is located below the mounting section. The outer wall of the core assembly 20 cooperates with the guide section, and the sealing member 70 is positioned between the hole wall of the mounting section and the outer wall of the core assembly 20.

1 to 4, in the first embodiment, the flow grooves 24 are arranged on the outer wall of the core assembly 20. The notched portion is formed on the shaft section of the core assembly 20 where the flow grooves 24 are located, and the complete portion is formed on the remaining shaft section portion of the core assembly 20. The lower end of the flow groove 24 is lower than the lower end of the hole wall of the mounting hole 121. The above structure makes it easier for the refrigerant in the valve chamber 1 to enter the flow groove 24, so that the pressure in the valve chamber 1 and the pressure in the rotor chamber 2 are more quickly balanced. Can be achieved.

1 to 4, in the first embodiment, the mounting hole 121 is a stepped hole, and the sealing member 70 is fixed on the stepped surface 122 of the stepped hole . The above structure is simple and easy to assemble. The sealing member 70 can be secured on the stepped surface 122 by bonding, fastener connection, interference connection, and the like.

1 and 3, in the first embodiment, the first connection port 14 and the second connection port 15 are arranged on the valve seat body 11 at intervals, and a horizontal pipe Is inserted into the first connection port 14, the second connection port 15 is in communication with the valve port 13, and an upright pipe is inserted into the second connection port 15.

1 to 4, in the first embodiment, the core assembly 20 has a communication chamber 4. The nut 40 is located in the communication chamber 4 and is fixed on the core assembly 20. The flow structure is arranged between the nut 40 and the core assembly 20, so that the communication chamber 4 is placed in communication with the rotor chamber 2 through the flow structure. When the core assembly is placed in the closed position and the refrigerant flows from the valve port 13 into the communication chamber 4, the refrigerant, in order to balance the pressure between the communication chamber 4 and the rotor chamber 2, It is possible to continue entering the rotor chamber 2 through the flow structure, so when the core assembly 20 moves upward, the downward resistance to the nut 40 decreases, and finally, the core assembly 20 is It can be opened more smoothly.

In the first embodiment, a flow hole is arranged in the nut, and the flow hole forms a flow structure. The above structure is simple and convenient to process.

8 to 13, the difference between the electromagnetic expansion valve according to the second embodiment and the electromagnetic expansion valve according to the first embodiment is in the specific shape of the core assembly 20. Specifically, in the second embodiment, the core assembly 20 includes a first core section 21, a second core section 22, and a first core section 21 fixedly connected to the nut 40. It has a shrinking section 23 positioned between the second core sections 22. The outer diameter of the shrinking section 23 gradually decreases from the first core section 21 to the second core section 22. The notched portion is formed on the shrinking section 23, and the complete portion is formed on the first core section 21. When the core assembly 20 is placed in the valve closed state, the sealing member 70 can be placed in sealing contact with the outer wall of the first core section 21 and the inner wall of the valve seat 10. When the core assembly 20 is placed in the valve open state, a distance exists between the outer wall of the shrinking section 23 and the sealing member 70. Specifically, when the core assembly 20 moves downward with the valve closed, the sealing member 70 is placed in a corresponding state with the first core section 21, and the sealing member 70 functions as a sealing and isolation In order to be able to perform, the inner surface of the sealing member 70 is fitted to the outer wall of the first core section 21, and the outer surface of the sealing member 70 is the inner wall of the valve seat 10 (preferably a mounting hole ( 121), and thus the valve chamber 1 is not placed in communication with the rotor chamber 2. When the core assembly 20 moves upward in the valve open state, the sealing member 70 is placed in a corresponding state with the shrinking section 23. Since the outer diameter of the shrinking section 23 is small, a gap is formed between the inner surface of the sealing member 70 and the outer surface of the shrinking section 23. The refrigerant in the valve chamber 1 can enter the rotor chamber 2 from the above-described clearance, and the refrigerant in the rotor chamber 2 can also enter the valve chamber 1 from the above-described clearance, and thus It achieves the purpose of quickly balancing the pressure in the valve chamber 1 and the pressure in the rotor chamber 2. The above structure is simple and convenient to process.

8 to 13, in the second embodiment, a stepped surface 25 is formed at the joint between the second core section 22 and the shrinking section 23. The above structure is simple and does not need to be arranged separately from other stepped surfaces in order to facilitate processing and manufacturing.

The operation process of the electromagnetic expansion valve is specifically described below. As shown in Figure 7, D1 is the outer diameter of the first core section 21, D2 is the diameter of the valve port 13, D3 is the outer diameter of the second core section 22, and D4 is the core The inner diameter of the assembly 20, SD1 is the cross section of the first core section 21, SD2 is the cross section of the valve port 13, SD3 is the cross section of the second core section 22, and SD4 is the core It is the cross-sectional area of the inner hole of the assembly 20.

(1) When the core assembly is in the valve closed state and the horizontal pipe is pressurized:

0 이다. 그에 따라, 상기한 구조는, 개방될 때 코어 조립체(20)가 적은 구동력을 요구하는 것을 허용한다. 바람직하게, 본 실시예에서, (SD2-SD1) ≤ 40mm²이다.The sealing member 70 may be placed in sealing contact with the outer wall of the core assembly 20 above the notch portion and the inner wall of the valve seat 10 to realize sealing (circumferential sealing). The valve chamber 1 and the rotor chamber 2 are isolated from each other through a sealing member 70, and the rotor chamber 2 is placed in communication with the communication chamber 4. The valve chamber 1 is isolated from the communication chamber 4 by a sealing pair sealingly abutting the valve port 13. The pressure of the refrigerant in the horizontal pipe acts on the core assembly 20, and the core assembly 20 is influenced by the pressure P and the area difference SD3-SD2 to form an upward pressure difference. Receive. The core assembly 20 is also affected by the pressure P and the area difference SD3-SD1 to form a downward pressure difference. In order to make the upward and downward sum forces of the core assembly 20 equal to zero, in this embodiment, the size of D1 is designed to be approximately equal to the size of D2. In this way, F = (SD3-SD2)*P-(SD3-SD1)*P = (SD3-SD2-SD3+SD1)*P = (SD1-SD2)*P

Is 0. Accordingly, the above structure allows the core assembly 20 to require less driving force when opened. Preferably, in this embodiment, (SD2-SD1) ≤ 40 mm ² .

(2) When the core assembly is in the valve open state and the horizontal pipe is pressurized:

When the core assembly 20 moves upward, the sealing member 70 and the core assembly 20 form a partial seal, and the valve chamber 1 is through a gap between the notch portion and the sealing member 70. , Placed in communication with the rotor chamber 2, and the pressure tends to be the same. The rotor chamber 2 is placed in communication with the communication chamber 4, and the pressure tends to be the same. The horizontal pipe pressure acts on the core assembly 20, and the core assembly 20 is affected by the pressure P and the area difference SD3-SD4 to form an upward pressure difference. The core assembly 20, in addition to the pressure P for forming the downward pressure difference and the area difference SD3-SD1 of the stepped surface 25 of the core assembly 20, the pressure for forming the downward pressure difference ( P) and the area difference (SD1-SD4) at the top of the core assembly 20, are affected; The area difference between the upward force and the downward force is zero, and the pressures of the valve chamber 1, the rotor chamber 2, and the connecting chamber tend to be the same. Therefore, the upward and downward sum forces of the core assembly 20 tend to be the same. When the core assembly is opened or closed, there is little demand for driving force.

(3) When the core assembly is in the valve closed state and the upright pipe is pressurized:

D2이기 때문에, F = (SD2-SD4)*P -(SD1-SD4)*P = (SD2-SD4-SD1+SD4)*P = (SD2-SD1)*P

0 이다. 따라서, 코어 조립체(20)의 상향 및 하향 합력은, 동일하게 되는 경향이 있다. 코어 조립체는, 개방될 때, 적은 구동력을 요구한다.The sealing member 70 may be placed in sealing contact with the outer wall of the core assembly 20 above the notch portion and the inner wall of the valve seat 10 to realize sealing (circumferential sealing). The valve chamber 1 and the rotor chamber 2 are isolated from each other through a sealing member 70, and the rotor chamber 2 is placed in communication with the communication chamber 4; And the valve chamber 1 is isolated from the communication chamber 4 by the sealing pair which hermetically contacts the valve port 13. The upright pipe pressure acts on the core assembly 20, and the core assembly 20 is affected by the pressure P and the area difference SD2-SD4 for forming the upward pressure difference; And the core assembly 20 is affected by the pressure P and the area difference SD1-SD4 for forming the downward pressure difference. D1

For D2, F = (SD2-SD4)*P -(SD1-SD4)*P = (SD2-SD4-SD1+SD4)*P = (SD2-SD1)*P

Is 0. Therefore, the upward and downward sum forces of the core assembly 20 tend to be the same. The core assembly, when opened, requires less driving force.

(4) When the core assembly is in the valve open state and the upright pipe is pressurized:

When the core assembly 20 moves upward, the sealing member 70 and the core assembly 20 form a partial seal, and the valve chamber 1 is in the rotor chamber 2 while pressure is entering into the upright pipe. Through the gap between the notch portion and the sealing member 70, to prevent the build-up, pressure build-up (the pressure value is clearly greater than the pressure value of the valve port 13, thereby creating an additional downward pressure difference) , Placed in communication with the rotor chamber 2, and the pressure tends to be the same. The rotor chamber 2 is placed in communication with the communication chamber 4, and the pressure tends to be the same. The upright pipe pressure acts on the core assembly 20, and the core assembly 20 is affected by the pressure P and the area difference SD3-SD4 to form an upward pressure difference. The core assembly 20, in addition to the pressure P for forming the downward pressure difference and the area difference SD3-SD1 of the stepped surface 25 of the core assembly 20, the pressure for forming the downward pressure difference ( P) and the area difference (SD1-SD4) at the top of the core assembly 20 are affected. The area difference between the upward force and the downward force is 0, that is, [(SD3-SD4)-(SD3-SD1)-(SD1-SD4)] = 0. The pressures of the valve chamber 1, the rotor chamber 2 and the communication chamber 4 tend to be the same. Therefore, the upward and downward sum forces of the core assembly 20 tend to be the same. When the core assembly is opened or closed, there is little demand for driving force.

The above description is merely preferred embodiments of the present application, and is not intended to limit the present application, and various modifications and variations may be made for those skilled in the art. Any modifications, equivalent substitutions or modifications made within the spirit and principle of the present application shall fall within the protection scope of the present application.

1: valve chamber 2: rotor chamber
4: Communication chamber 10: Valve seat
11: valve seat body 12: connecting seat
121: mounting hole 122: step surface
13: valve port 14: first connection port
15: second connection port 20: core assembly
21: first core section 22: second core section
23: Shrink section 24: Flow groove
25: step surface 30: screw rod
40: nut 41: protrusion
50: drive mechanism 51: rotor
52: coil 60: housing
70: sealing member 80: support
81: position-restriction groove 90: first stop structure
100: second stop structure 110: elastic element

Claims (14)

As an electronic expansion valve:
A valve seat 10 having a valve chamber 1 and a valve port 13 placed in communication with the valve chamber 1;
A screw rod 30 and a nut 40, the screw rod 30 being cooperated with a nut 40 by a screw, a screw rod 30 and a nut 40;
As a core assembly 20 fixedly connected to the nut 40, at least a portion of the core assembly 20 is movably arranged in the valve chamber 1, and the core assembly 20 is a complete portion and a notch portion A core assembly (20), wherein at least a portion of the complete portion is located above the notch portion;
A drive mechanism (50) comprising a rotor (51) and a coil (52), wherein the rotor (51) is connected to the screw rod (30) and the rotor (51) is screwed through the coil (52) The rod 30 is driven to rotate, and the nut 40 is movable along an axial direction through screw cooperation with the screw rod 30, and the core assembly 20 is provided with the valve port 13 ) Is driven by the nut (40) to approach or move away from the valve port (13), the driving mechanism (50);
A sealing member (70) arranged between the valve seat (10) and the core assembly (20), wherein the sealing member (70) is configured to cooperate with the complete part or the notched part; And
As a housing 60 fixedly connected to the valve seat 10, the housing 60 has a rotor chamber 2, and when the sealing member 70 cooperates with the complete part, the rotor chamber (2) is not placed in communication with the valve chamber 1 through the sealing effect of the sealing member 70, and when the sealing member 70 cooperates with the notch portion, a gap, the sealing member The housing 60 is formed between the notch portion 70 and the rotor chamber 2, which is placed in communication with the valve chamber 1 through the gap.
Electronic expansion valve comprising a. According to claim 1,
A flow groove 24 is arranged on the outer wall of the core assembly 20, and the notched portion is formed on a shaft section of the core assembly 20 where the flow groove 24 is located, and the complete The portion is formed on the remaining shaft section portion of the core assembly (20), an electronic expansion valve. According to claim 2,
The flow groove 24 is an elongated groove that extends in the axial direction of the core assembly 20, an electromagnetic expansion valve. According to claim 2,
The upper end of the flow groove 24 is spaced a predetermined distance from one end of the core assembly 20 close to the valve port 13, and the core assembly 20 away from the valve port 13 The electromagnetic expansion valve, which is spaced a predetermined distance from one end of the. According to claim 1,
The core assembly 20 includes a first core section 21 fixedly connected to the nut 40 and a second core section 22 positioned below the first core section 21, wherein The outer diameter of the second core section 22 is larger than the outer diameter of the first core section 21, and the sealing member 70 includes the first core section 21 and the valve seat 10 ) Is located between the electromagnetic expansion valve. The method of claim 5,
A stepped surface 25 is formed at the joint between the first core section 21 and the second core section 22, and a first stop structure 90 is arranged on the valve seat 10 And the lower surface of the first stop structure 90 is configured to abut against the stepped surface 25 and to cooperate with the stepped surface 25. The method of claim 6,
A protrusion 41 is arranged on the nut 40, a second stop structure 100 arranged on the first stop structure 90, is arranged on the valve seat 10, the first 2 The electromagnetic expansion valve, wherein the upper surface of the stop structure (100) is configured to abut against the lower surface of the protrusion (41) and to cooperate with the lower surface of the protrusion (41). The method of claim 7,
The first stop structure 90 is a lower stop ring, the second stop structure 100 is an upper stop ring, the sealing member 70 is a sealing ring, and the sealing ring is the first stop structure 90 ) And the second stop structure 100, and the core assembly 20 is inserted into the upper stop ring, the lower stop ring and the sealing ring. According to claim 1,
The protrusion 41 is arranged on the nut 40, and the electromagnetic expansion valve further includes a support portion 80 fixedly arranged on the valve seat 10, and the position-limiting groove 81 is An electromagnetic expansion valve, arranged on a support (80), and wherein the projection (41) is configured to cooperate with the position-limiting groove (81). The method of claim 9,
The support portion 80 is cup-shaped, and an opening extending upward is arranged on the bottom portion of the support portion 80, and the opening is to form the position-limiting groove 81, the former Expansion valve. According to claim 1,
The core assembly 20 includes a first core section 21, a second core section 22, and a first core section 21 and the second core section fixedly connected to the nut 40 ( 22) having a shrinking section 23 located between, the outer diameter of the shrinking section 23 is gradually reduced from the first core section 21 to the second core section 22, the An electromagnetic expansion valve, wherein a notched portion is formed on the shrinking section 23 and the complete portion is formed on the first core section 21. The method of claim 5 or 11,
The electromagnetic expansion valve, wherein the cross-sectional area of the first core section 21 is set to be SD1, and the cross-sectional area of the valve port 13 is set to SD2, which satisfies the following relationship:
(SD2-SD1) ≤ 40mm ² . According to claim 2,
The valve seat 10 has a valve seat body 11 and a connection seat 12 fixed on the valve seat body 11, and the valve chamber 1 has the connection seat 12 and the valve It is formed inside the seat body 11, the valve port 13 is arranged in the valve seat body 11, a mounting hole 121 is arranged in the connecting seat 12, the mounting hole 121 Has a mounting section and a guiding section having a larger opening than the mounting section and located below the mounting section, the outer wall of the core assembly 20 cooperating with the guiding section, and sealing The member (70) is located between the hole wall of the mounting section and the outer wall of the core assembly (20), an electromagnetic expansion valve. The method of claim 13,
The flow groove 24 is arranged on the outer wall of the core assembly 20, and the notched portion is formed on the shaft section of the core assembly 20 where the flow groove 24 is located, and the complete A portion is formed on the remaining shaft section portion of the core assembly 20, and the lower end of the flow groove 24 lies below the lower end of the hole wall of the mounting hole 121, Electronic expansion valve.

Images