WO2014063558A1

WO2014063558A1 - Expansion valve

Info

Publication number: WO2014063558A1
Application number: PCT/CN2013/084559
Authority: WO
Inventors: 金耿; 阮义兵
Original assignee: 温岭市恒发空调部件有限公司
Priority date: 2012-10-26
Filing date: 2013-09-29
Publication date: 2014-05-01
Also published as: CN102878734B; JP2015530558A; US20150276286A1; JP6134386B2; CN102878734A

Abstract

Disclosed is an expansion valve, comprising a housing (10) having an inlet end (101) and an outlet end (102), within the housing (10) a valve body (1) is fixedly provided having an inner cavity and being of a straight tubular shape, wherein a side wall of the valve body (1) is provided with an inlet (11) and an outlet (12) respectively in communication with the inner cavity and the housing (10); a separation sleeve (8) for separating the inlet (11) from the outlet (12) is provided between the housing (10) and the valve body (1); within the inner cavity is provided a first valve core (2) and a second valve core (3) both able to slide along the inner cavity and match each other; a retaining ring (7) is fixed in the central portion of the inner cavity between the first valve core (2) and the second valve core (3); two ends of the inner cavity are respectively provided with a spring assembly making the first valve core (2) and the second valve core (3) tend to move towards the retaining ring (7); and a damping structure capable of having a buffering effect on the first valve core (2) and the second valve core (3) is provided between the first valve core (2) and the second valve core (3).

Description

Expansion valve

The invention belongs to the technical field of air conditioners and relates to a mechanical automatic expansion valve for inverter air conditioner refrigeration. Background technique

The expansion valve is an important component in the refrigeration system and is typically installed between the condenser and the evaporator. The expansion valve enables the gas evaporated by the evaporator to be liquefied by the compressor to the high temperature and high pressure liquid refrigerant, and is throttled by the throttle to become a low temperature and low pressure mist liquid refrigerant, and then the refrigerant is absorbed in the evaporator. The heat reaches the cooling effect. The expansion valve controls the flow of the valve through a change in the degree of superheat at the end of the evaporator, preventing liquid flow shocks from being drawn into the compressor due to under-utilization of the evaporator area and excessive flow of the evaporator due to insufficient vaporization of the refrigerant. The expansion valve for air conditioning is divided into mechanical expansion valve and electronic expansion valve. The existing inverter air conditioner mainly uses electronic expansion valve to adjust the pressure difference by adjusting the diameter to control the liquefaction and gasification of the refrigerant according to the design requirements. Some air conditioners also use mechanical expansion valves instead. Electronic valve.

The electronic valve is driven by a digital signal to control the size of the electronic valve, ensuring a constant pressure difference before and after the valve, and fully utilizing the function of the condenser and the evaporator. At the same time, because the compressor motor speed is adjustable, the motor speed can be adjusted in time, so that the compressor motor speed and the electronic expansion valve motor rotation angle can be changed at the same time to ensure that the pressure difference between the front and the back of the electronic valve is constant, so the air conditioner is highly efficient.

However, since the price of the electronic valve is relatively expensive, a capillary tube is substituted for the electronic expansion, and then the inverter compressor is used instead of the ordinary compressor. Thus, when the pressure difference between the front and the back of the capillary is deviated from the design requirement, the inverter compressor speed is changed, so that the pressure difference between the front and the back of the capillary tube satisfies the design requirement.

Such as a two-way circulation thermal expansion valve announced by the Chinese patent [Patent No.: 20051004890 1. 9 , Announcement No.: CN1804440], comprising a valve body and a power head component, the valve body is provided with a first interface and a second interface, and a valve port connecting the first interface and the second interface is opened in the valve body, The lower side of the valve port is provided with a valve core member supported by the adjusting spring and the transmission rod obtained from the power head member, wherein the valve core member is provided with a first interface and a second interface. The orifice has a movable member in which the orifice is kept in a clear or closed state. The throttle hole and the movable member cooperate to form a one-way throttle structure inside the thermal expansion valve, which is similar to a one-way throttle valve. The existence of the structure allows the thermal expansion valve to circulate in both directions, and is convenient when applied to an air conditioning system. Installation reduces potential leaks due to the large number of quilting and reduces the manufacturing cost of the air conditioning system. However, although the two-way flow expansion valve can realize two-way circulation, it is not a two-way flow in the true sense. Because the valve only flows in the forward direction, the temperature change of the book valve is sensed by the temperature sensing package. In the reverse circulation, it can only flow through the orifice on the valve core, and the diameter of the valve cannot be changed, which increases the unnecessary resistance when the refrigerant flows, and increases the energy consumption of the air conditioner. In the reverse direction, the orifice is blocked by the movable member, and the spool must be pushed open to circulate, which causes the spool to frequently impact under the force of the spring, which reduces the service life of the valve.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems in the prior art, and an expansion valve which regulates the diameter of a valve by controlling the output flow of the compressor and ensures the pressure difference between the front and rear of the valve is proposed.

The object of the present invention can be achieved by the following technical solutions: An expansion valve, characterized in that the expansion valve comprises an outer casing having an inlet end and an outlet end, wherein the casing is fixed with a straight cylindrical valve body having a lumen The side wall of the valve body is provided with an inlet and an outlet communicating with the inner cavity and the outer casing, and a partition sleeve separating the inlet and the outlet is disposed between the outer casing and the valve body, and the inner cavity is provided with energy a spool 1 and a spool 2 which are slid along the inner cavity, and a retaining ring is fixed in a middle portion of the inner cavity between the spool 1 and the spool 2, and the inner ends of the inner cavity are respectively provided Spool one and spool 2 have m 3⁄4

A spring assembly that moves toward the retaining ring, and a damping structure capable of buffering the spool 1 and the spool 2 is disposed between the spool 1 and the spool 2.

Forward: When the refrigerant enters the casing from the inlet end, it can only enter the valve body cavity from the inlet due to the existence of the spacer. The spring assembly is compressed by the thrust of the refrigerant, and the valve core is pushed away from the retaining ring. The outlet of the body is discharged and finally flows out from the outlet end of the outer casing. Reverse: When the refrigerant enters the outer casing from the outlet end, due to the existence of the spacer, it can only enter the valve body cavity from the outlet. The spring assembly is compressed by the thrust of the refrigerant and becomes shorter, pushing the spool away from the retaining ring, from the valve. The inlet of the body is discharged and finally flows out from the inlet end of the casing. The expansion valve has a paired male and female valve core structure, the valve core 1 and the valve core 2, and one of the spools is controlled by the pressure line pressure difference change; due to the existence of the damping structure, the valve core is close to the valve core 2 A smooth buffering process reduces the impact between the spools, reduces the wear of the spool as it abuts the spool, and increases the service life of the expander.

In the above expansion valve, the retaining ring includes a pilot hole, an annular cavity, a flow guiding hole for communicating the annular cavity with the inlet, and a retaining groove engageable with the valve body. The guiding hole is used to cooperate with the spool, so that the spool can enter the retaining ring, and the retaining groove can firmly fix the retaining ring in the inner cavity.

In the above expansion valve, the damping structure includes a front cylinder, a front throttle cone, a rear cylinder, a rear throttle cone, a front guide pillar and the valve core 2 which are sequentially provided in the head of the spool 1 a rear throttle cone, a rear cylindrical bore, a through-groove, a front throttle cone and a front cylindrical bore matched with a head of the spool, and the valve core 2 is further provided with a front cylindrical bore connected to the outlet Passing through the mouth. When the rear cylinder of the spool 1 enters the front cylindrical bore of the spool 2, a relatively closed one-way lumen is formed between the spool 2 and the spool one as a front damping chamber. The front guide post of the spool 1 cooperates with the inner bore of the retaining ring. Since the mating clearance is relatively small, a relatively closed inner cavity is formed between the spool and the retaining ring as a medium damping cavity. The valve spool has a better cushion when moving forward to close the valve, reducing the impact of the spool and increasing the life of the valve.

In another aspect, in the above expansion valve, the valve core is opened m 3⁄4

Connect the through hole of the outside of the valve body and the through hole. When the refrigerant is small, the spool 1 and the spool are not moved, and the refrigerant enters the through-hole from the through hole, and then flows out through the outlet of the retaining ring and the valve body. The small flow refrigerant spool 1 and the spool 2 can be moved, reducing the wear of each spool and increasing the life of the spring assembly.

In the above expansion valve, the through hole is provided with a capillary tube. A predetermined pressure drop is generated in the refrigeration system, and the capillary relies on its flow resistance to produce a pressure drop along the length to control the flow of the refrigerant and maintain the differential pressure between the condenser and the evaporator, ensuring minimum continuous cooling for different refrigeration settings.

Alternatively, in the above expansion valve, the valve body is provided with a flow guiding groove that can communicate with the through-hole and the front cylindrical hole. When the flow rate is small, the refrigerant can directly enter the front cylindrical hole from the through-hole, avoiding the mutual movement between the two spools and reducing the wear caused by the movement of the spool.

Alternatively, in the above expansion valve, the valve body 2 has a through hole connecting the through hole and the flow guiding port. When the flow rate is small, the refrigerant can enter the diversion port directly from the through-the-vacancy.

Alternatively, in the above expansion valve, the valve body has a through hole communicating with the rear throttle hole and the front cylindrical hole. When the flow rate is small, the refrigerant can enter the front cylindrical bore directly from the rear throttle cone.

Alternatively, in the above expansion valve, the valve body has a through hole extending axially through the valve body. The small flow of refrigerant can be directly discharged from the valve body passage into the valve body cavity, and the valve body is discharged from the small hole of the spring seat.

In the above expansion valve, the spring assembly includes a spring seat and a spring, the spring end abuts against the valve core 1 or the valve core 2, and the other end abuts against the spring seat, and the spring seat is fixed. At the two ends of the valve body and the end of the spring seat, a small hole communicating with the outer casing is opened, and the tail of the valve core 1 and the valve core 2 have a cylinder and a damping with a small clearance gap with the valve body. The ring groove, the damping ring groove is provided with an open damping ring. A rear damping chamber is formed between the spring seat, the valve body, the valve core one or the valve core 2, and the damping ring, and serves as an expansion valve direction control chamber. m 3⁄4

In the above expansion valve, the spring seat has a limit lever that restricts the swing of the spring. After the limit lever is added, the axial swing amplitude of the spring is limited to ensure that the spring does not overload and improve the spring life.

In the above expansion valve, a filter screen assembly is provided at the inlet end and the outlet end of the casing, and the screen assembly includes a screen frame and a screen fixed to the casing. The filter assembly is used to filter foreign matter trapped in the refrigerant to prevent clogging of the expansion valve assembly.

Compared with the prior art, the present expansion valve has the following advantages:

1. The structure is simple, and the change of the pressure of the cold pipeline is controlled by the reversing valve to control the direction of the expansion valve.

2. The pressure difference between the inner chamber and the outlet and the inlet is balanced by the damping structure to ensure the pressure required for the refrigerant to be liquefied. At the same time, when the refrigerant flow rate is small, the valve core can not operate, reducing the frequent movement of the spring and improving the service life of the expansion valve assembly.

3. A front damper cavity is formed between the spool 1 and the spool 2, so that the spool 1 has better cushioning when it contacts the spool 2, reducing their impact and increasing the life of the expansion valve.

4. Form a middle damper cavity between the retaining ring and the spool, and form a rear damper cavity between the spool or the spool 2 and the valve body, which is better for the spool or the spool 2 to leave the valve seat. The buffering function prevents the spring from vibrating, reduces the noise of the spring, and increases the life of the expansion valve.

5. The proper fit of the head of the spool 1 to the spool 2 can vary with the flow rate of the refrigerant as the flow rate of the refrigerant changes. Therefore, the refrigerant flow resistance can be reduced, which has a significant effect on improving the energy efficiency ratio of the entire air conditioner. DRAWINGS

Figure 1 is a schematic view showing the structure of the present expansion valve of the embodiment.

Fig. 2 is a schematic view showing the structure of the valve body 2 of the embodiment.

Fig. 3 is a schematic structural view of a valve body 1 of the embodiment.

Fig. 4 is a schematic view showing the structure of the retaining ring of the embodiment.

Fig. 5 is a schematic view of the spring seat structure of the embodiment. m 3⁄4

6 is a schematic diagram of a small flow guiding trajectory structure of the second embodiment.

7 is a schematic diagram of a small flow flow guiding trajectory structure of the third embodiment.

Fig. 8 is a schematic view showing the structure of a small flow guiding trajectory of the fourth embodiment.

9 is a schematic diagram of a small flow flow guiding trajectory structure of Embodiment 5.

Fig. 10 is a schematic view showing the structure of a small flow flow guiding trajectory of the sixth embodiment.

1. Valve body; 1 1. Import; 12, outlet; 2. Spool one; 21, front cylinder; 22, front throttle cone; 23, rear cylinder; 24, rear throttle cone; 26, damping ring groove; 27, guide groove; 3, valve core 2; 31, rear throttle cone hole; 32, rear cylindrical hole; 33, through slot; 34, through hole; 35, front throttle cone 36, front cylindrical hole; 37, diversion port; 4, spring; 5, spring seat; 51, limit rod; 52, small hole; 6, damping ring; 7, retaining ring; 71, diversion hole; , stop groove; 73, guide hole; 74, annular cavity; 8, spacer; 9, filter assembly; 10, housing; 101, inlet end; 102, the outlet end. detailed description

The following is a description of the technical solutions of the present invention, and the present invention is not limited to the embodiments.

Embodiment 1

As shown in FIG. 1, the expansion valve includes a casing 10 having an inlet end 101 and an outlet end 102. A casing body 1 having a lumen is fixed in the casing 10, and a communicating cavity is formed in the side wall of the valve body 1. And an inlet 11 and an outlet 12 of the outer casing 10, and a spacer 8 is disposed between the outer casing 10 and the valve body 1 to block the inlet 11 and the outlet 12. The inner cavity is provided with a spool 2 which can slide along the inner cavity. The valve core 2, a retaining ring 7 is fixed in the middle of the inner cavity between the valve core 2 and the valve core 2, and the inner cavity is respectively provided with the valve core 2 and the valve core 2 having a tendency to move toward the retaining ring 7. The spring assembly, between the spool 2 and the spool 2, is provided with a damping structure capable of buffering the spool 2 and the spool 2.

Specifically, as shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, the retaining ring 7 includes a guiding hole 73, an annular cavity 74, and a guide for connecting the annular cavity 74 with the inlet 11 m 3⁄4

A flow hole 71 and a stop groove 72 that is engaged with the valve body 1. The damper structure includes a front cylinder 2 1 , a front throttle cone 22 , a rear cylinder 23 , a rear throttle cone 24 , a front guide pillar 25 , and a valve core 2 , which in turn have a valve core 2 the head matching matching rear throttle cone 3 1 , the rear cylindrical hole 32 , the through slot 33 , the front throttle cone 35 and the front cylindrical bore 36 , and the spool 2 is provided with a front cylindrical bore 36 and an outlet 12-phase connected flow port 37.

The spring assembly includes a spring seat 5 and a spring 4, one end of which abuts against the spool one or the spool 2, and the other end abuts against the spring seat 5. The spring seat 5 is fixed at both ends of the valve body 1 and has a small hole 52 communicating with the outer casing 10. The spring seat 5 has a limiting rod 51 for restricting the swing of the spring 4. Both the spool 2 and the tail of the spool 2 have a cylindrical body and a damper ring groove 26 which have a small clearance with the valve body 1, and the damper ring groove 26 is provided with an open damper ring 6. A screen assembly 9 is provided at the inlet end 101 and the outlet end 102 of the outer casing 10. The screen assembly 9 includes a screen holder and a screen fixed to the outer casing 10.

The refrigerant enters from the outer casing 10, and after passing through the filter assembly 9, the control circuit and the conduction path enter the valve.

If the refrigerant enters from the outlet end 102 of one side of the spool 2, the shell IJ:

Control circuit: The refrigerant enters from the outlet end 102 of the outer casing 10, passes through the filter assembly 9 at the outlet end 102, and then passes through the small hole 52 of the spring seat 5 to act on the spool 2, since the pressure at the outlet 12 of the valve is greater than Import 11, so push the spool 2 3. At this time, the refrigerant in the inner cavity of the valve body 2, the valve body 1 and the spring seat 5 is discharged through the small hole 52 of the spring seat 5 and then merged with the flow passage. When the spool 2 is abutted against the retaining ring 7, the spool 2 stops and unloads.

Guide passage: Since the inlet 11 and the outlet 12 of the valve body 1 are separated by the spacer 8, the refrigerant can only enter the outlet 12 of the valve body 1 and enter the diversion port 37 of the spool 2, passing through the spool 1 and The gap of the valve core 2 and the annular cavity 74 of the retaining ring 7 are discharged from the flow guiding hole 71 of the retaining ring 7 and the inlet 11 of the valve body 1 to the valve body 1 and then through the gap between the valve body 1 and the outer casing 10, After the combination with the control circuit, the valve assembly 9 consisting of the filter holder and the filter screen at the inlet end 101 is discharged from the inlet end 101 of the outer casing 10. m 3⁄4

If the refrigerant enters from the inlet end 101 of one side of the spool one, the shell IJ:

Control circuit: The refrigerant enters the small hole 52 of the spring seat 5 and acts on the spool one. Since the pressure of the inlet 1 1 of the valve is greater than the outlet 12, the spool 2 is pushed close to the retaining ring 7. At this time, the refrigerant in the inner cavity surrounded by the valve body 2, the valve body 1 and the spring seat 5 is discharged from the valve body 1 through the small hole 52 of the spring seat 5, and merges with the flow path. When the spool 2 abuts against the retaining ring 7, the spool 2 stops acting and unloads.

Guide passage: Since the inlet 11 and the outlet 12 of the valve body 1 are separated by the spacer 8, the refrigerant can only enter the inlet 11 of the valve body 1 and enter the retaining ring 7 after passing through the flow guiding hole 71 at the retaining ring 7. The annular cavity 74 passes through the gap between the spool 2 and the spool 2, and is discharged from the flow guiding port 37 of the spool 2 and the outlet 12 of the valve body 1 through the valve body 1 and the outer casing 10. The gap, here merged with the control path, exits the valve from the outlet end 102 of the outer casing 10 through the screen assembly 9 consisting of the screen frame and the screen at the outlet end 102.

Since a relatively closed inner cavity between the spool 1 and the spool 2 and a relatively closed inner cavity between the retaining ring 7 and the spool 2 are designed on the moving path of the spool, there is also a The relatively closed inner cavity between the valve body 1, the spring seat 5 and the spool 2 or the spool 2, so that a plurality of dampings can be generated when the spool 2 or the spool 2 is moved. Due to the presence of multiple damping, there is a smooth buffering process when the spool 2 or the spool 2 moves, which reduces the impact of the two spools and reduces the conical head and the spool 2 on the spool. Wear at the time of abutment to increase the service life of the expansion valve.

Embodiment 2

The structure and principle of the second embodiment are basically similar to those of the first embodiment. As shown in FIG. 6, the difference from the first embodiment is that a small flow guiding trajectory structure is added. The small flow guiding trajectory structure is such that the valve core 2 is provided with a through hole 34 communicating with the outer portion of the valve body 1 and the through hole 33, and the through hole 34 is provided with a capillary tube. The flow rate of the through holes 34 can be changed by adding a capillary.

Embodiment 3 m 3⁄4

The structure and principle of the third embodiment are basically similar to those of the second embodiment. As shown in FIG. 7, the difference from the second embodiment lies in the small flow guiding trajectory structure. The small flow guiding trajectory structure is such that the valve core 2 is provided with a flow guiding groove 27 which can connect the through-hole 33 and the front cylindrical hole 36.

Embodiment 4

The structure and principle of the fourth embodiment are basically similar to those of the second embodiment. As shown in FIG. 8, the difference from the second embodiment lies in the small flow guiding trajectory structure. The small flow guiding trajectory structure is such that the valve core 2 is provided with a through hole 34 connecting the permeable groove 33 and the flow guiding port 37.

Embodiment 5

The structure and principle of the fifth embodiment are basically similar to those of the second embodiment. As shown in FIG. 9, the difference from the second embodiment lies in the small flow guiding trajectory structure. The small flow guiding trajectory structure has a through hole 34 connecting the rear throttle cone 31 and the front cylindrical hole 36 to the spool 1 .

Embodiment 6

The structure and principle of the sixth embodiment are basically similar to those of the second embodiment. As shown in FIG. 10, the difference from the second embodiment lies in the small flow guiding trajectory structure. The small flow guiding trajectory structure has a through hole 34 extending axially through the spool 2 from the spool. The small-flow refrigerant is discharged from the valve body 1 through the outlet 12 of the valve body 1, but is directly discharged from the valve body 1 by the small hole 52 of the spring seat 5.

The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

Claims

An expansion valve, characterized in that the expansion valve comprises a casing (10) having an inlet end (101) and an outlet end (102), and the casing (10) is fixed in a straight cylindrical shape having a cavity therein. The valve body (1), the side wall of the valve body (1) is provided with an inlet (11) and an outlet (12) communicating with the inner cavity and the outer casing (10), the outer casing (10) and the valve body ( 1) A spacer (8) is provided between the inlet (11) and the outlet (12), and the inner chamber is provided with a pair of valve cores (2) which are slidable along the inner cavity and a spool 2 (3), a retaining ring (7) is fixed in a middle portion of the inner cavity between the spool 1 (2) and the spool 2 (3), and the inner cavity is respectively provided with a spool One (2) and spool II

(3) A spring assembly having a tendency to move toward the retaining ring (7), between the spool one (2) and the spool two (3) being capable of facing the spool one (2) and the spool two (3) A damping structure with a cushioning effect.

2. The expansion valve according to claim 1, wherein the retaining ring (7) comprises a guiding hole (73), an annular cavity (74), and an annular cavity (74) and an inlet (11). A communicating orifice (71) and a stop groove (72) that can be engaged with the valve body (1).

The expansion valve according to claim 2, wherein the damping structure comprises a front cylinder (21) and a front throttle cone which are sequentially provided by the head of the valve body (2)

(22), the rear cylinder (23), the rear throttle cone (24), the front guide post (25), and the spool 2 (3) have a rear section matching the head of the spool one (2) in turn. a flow cone hole (31), a rear cylindrical hole (31), a through-hole (33), a front throttle cone (35) and a front cylindrical hole (36), and the valve core 2 (3) is further provided A flow port (37) that connects the front cylindrical bore (36) to the outlet (12).

The expansion valve according to claim 3, wherein the valve body 2 (3) is provided with a through hole (34) that communicates with the outer portion of the valve body (1) and the through hole (33).

The expansion valve according to claim 3, wherein the valve core (2) is provided with a flow guiding groove (27) capable of connecting the through-hole (33) and the front cylindrical hole (36). .

The expansion valve according to claim 3, wherein the valve core 2 (3) is provided with a through hole (34) connecting the through hole (33) and the flow guiding port (37). Claim

The expansion valve according to claim 3, wherein the valve body (2) is provided with a through hole connecting the rear throttle cone (31) and the front cylindrical hole (36).

(34).

The expansion valve according to claim 3, wherein the valve body (2) is provided with a through hole (34) axially penetrating the spool (2).

The expansion valve according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, wherein said spring assembly comprises a spring seat (5) and a spring (4), said One end of the spring (4) abuts against the spool one (2) or the spool two (3), the other end abuts against the spring seat (5), and the spring seat (5) is fixed to the valve body (1) Both ends of the spring seat (5) are provided with small holes communicating with the outer casing (10)

(52), the valve core one (2) and the tail end of the valve core two (3) each have a cylinder and a damping ring groove (26) with a small clearance gap with the valve body (1), the damping ring An open damping ring (6) is mounted on the groove (26).

10. The expansion valve according to claim 9, wherein a filter assembly (9) is provided at the inlet end (101) and the outlet end (102) of the outer casing (10), the filter assembly (9) Includes a filter holder and strainer that are attached to the outer casing (10).