JP2015530558A - Expansion valve - Google Patents

Abstract

The present invention provides an expansion valve belonging to the technical field of air conditioning for solving the problem that the valve core of a conventional expansion valve is frequently impacted by the acting force of a spring and the useful life of the valve is reduced. To do. The expansion valve includes a casing having an inlet end and an outlet end. A straight cylindrical valve body having a cavity is fixed in the casing, and an inlet and an outlet for communicating the cavity and the casing are provided on a side wall of the valve body. Between the casing and the valve body, A spacer is provided to separate the inlet and the outlet. In the cavity, there are provided a valve core A and a valve core B that slide along the cavity and face each other, and a stopper is placed in the center of the cavity between the valve core A and the valve core B. It is fixed. At both ends of the cavity, a spring unit is provided for stopping and moving the valve core A and the valve core B toward each other, and between the valve core A and the valve core B, the valve core A and the valve core B A damping structure capable of performing a buffering action is provided. Since the damping structure exists, when the valve core A approaches the valve core B, the shock between the valve cores can be reduced through a buffering process, and the durability of the expansion valve can be increased. [Selection] Figure 1

Description

The present invention belongs to the technical field of air conditioning, and relates to an automatic expansion valve in an inverter air conditioning refrigeration machine.

The expansion valve is an important part of the refrigeration system and is usually installed between the condenser and the evaporator. The expansion valve boosts and liquefies the gas evaporated by the evaporator into a high-temperature and high-pressure liquid refrigerant by the compressor, and further throttles it to a low-temperature and low-pressure spray-like liquid refrigerant by the throttle port. The refrigeration effect is realized by absorbing water. The expansion valve controls the flow rate of the valve through a change in superheat at the end of the evaporator, so the flow rate becomes very small and the evaporator area cannot be fully used, or the flow rate becomes very large and the evaporator area is insufficient. This prevents the refrigerant from being completely vaporized and sucked into the compressor to form a liquid state. The expansion valve for air conditioning is separated into a mechanical expansion valve and an electronic expansion valve, and the conventional inverter air conditioning mainly controls the differential pressure by adjusting the passage diameter by the electronic expansion valve. The system controls the liquefaction and vaporization of the refrigerant, and some air conditioning systems use mechanical expansion valves instead of electronic valves.

The electronic valve uses a digital signal to drive the drive motor to control the passage diameter of the electronic valve, ensuring that there is a constant pressure difference across the valve, and that sufficient condenser and evaporator The effect is demonstrated. Furthermore, since the frequency change of the rotation speed of the compressor motor can be adjusted, the rotation speed of the motor can be adjusted immediately, and thus the rotation speed of the compressor motor and the rotation angle of the electronic expansion valve motor can be adjusted. Changes synchronously to ensure a constant differential pressure before and after the electronic valve, which increases the efficiency of the air conditioning.

However, since the price of the electronic valve is high, a capillary tube is used instead of the electronic expansion valve, and a compressor capable of changing the frequency is used instead of an ordinary compressor. If the pressure difference before and after the capillary does not satisfy the design requirement, the rotational speed of the compressor capable of changing the frequency is changed so that the pressure difference before and after the capillary satisfies the design requirement.
In Cited Document 1, a two-way circulation temperature expansion valve is disclosed, including a valve body and a power head member, the valve body is provided with a first connection port and a second connection port, and the valve body has a first connection port. And a valve port communicating with the second connection port. A valve core member that is supported by a control spring and a transmission rod that receives power from a power head member is installed below the valve port, and the first connection port and the second connection port are provided on the valve core member. And a movable member that opens or closes the throttle hole is provided in the throttle hole. The throttle hole and the movable member are adapted to form a one-way throttle structure inside the temperature expansion valve, and the structure is similar to the one-way throttle valve. The structure allows the temperature expansion valve to flow in both directions, and when applied to an air conditioning system, it is convenient to install, reduces potential leakage points due to the increased number of welded seams, and is air conditioned. The manufacturing cost of the system could be reduced. However, such an expansion valve in bidirectional flow can realize bidirectional flow, but is not truly bidirectional flow. In the valve, when flowing in the forward direction, a change in the diameter of the valve can be realized by a temperature change in temperature sensing. When flowing in the reverse direction, the diameter of the valve is not changed and flows through the throttle hole on the valve core, so that an unnecessary blocking force when the refrigerant flows increases and the energy consumption of the air conditioning increases. Furthermore, when it flows in the opposite direction, the throttle hole is blocked by the movable member, and it is necessary to push and open the valve core. Therefore, the valve core is frequently impacted by the acting force of the spring, and the service life of the valve Was reduced.

Chinese Patent No. 200510048901.9

An object of the present invention is to provide an expansion valve that controls the output flow rate of a compressor to immediately adjust the passage diameter of the valve and guarantees a pressure difference before and after the valve in order to solve the above-mentioned problems of the prior art. To do.

The object of the present invention is realized by the following technical means. The expansion valve includes a casing having an inlet end and an outlet end, and a straight cylindrical valve body having a cavity is fixed in the casing. An inlet and an outlet communicating the cavity and the casing are provided on the side wall of the valve body, and a spacer for partitioning the inlet and the outlet is provided between the casing and the valve body, and in the cavity, A valve core A and a valve core B that slide along the cavity and face each other are provided. A stopper is fixed to the central portion of the cavity between the valve core A and the valve core B, and the valve core A and the valve core B are moved toward the stopper at both ends of the cavity. A biasing spring unit is provided, and a damping structure in which the valve core A and the valve core B have a buffering action is provided between the valve core A and the valve core B.

In the forward direction, when the refrigerant enters the casing from the inlet end, since the spacer exists, by entering only the cavity of the valve body from the inlet, the spring unit is compressed and shortened by the driving force of the refrigerant, In order to propel the valve core B away from the stop, the refrigerant is discharged from the outlet of the valve body and finally flows out from the outlet end of the casing. In the reverse direction, when the refrigerant enters the casing from the outlet end, since the spacer exists, by entering only the valve body cavity from the outlet, the spring unit is compressed and shortened by the driving force of the refrigerant, Since the valve core A is propelled away from the stop, the refrigerant is discharged from the inlet of the valve body and finally flows out from the inlet end of the casing. The expansion valve has an appropriate male and female valve core structure, that is, a valve core A and a valve core B, and the operation of one of the valve cores is controlled by a change in the pressure difference of the pressure line. Since the damping structure exists, when the valve core A approaches the valve core B, the shock between the valve cores is reduced through a stable buffering process, and the wear when the valve core A and the valve core B come into contact with each other is reduced. Decreasing and extending the service life of the expansion valve.

In the expansion valve, the stopper includes a guiding hole, an annular recess, a flow introduction hole communicating the annular recess and the inlet, and a positioning groove fitted into the valve body. The guiding hole is used for engagement with the valve core A, and when the valve core A is stopped, the positioning groove can firmly fix the stopper in the cavity.

In the expansion valve, the damping structure includes a valve core A and a valve core B. The head portion of the valve core A has a front cylinder, a front throttle cone, a rear cylinder, a rear throttle cone, and a front guiding column. The valve core B includes a rear throttle conical hole, a rear cylindrical hole, a through groove, a front throttle conical hole, and a front cylindrical hole that are engaged with the head portion of the valve core A, and the valve core B includes a front cylindrical hole and A diversion port is provided for communicating the outlets with each other. When the rear cylinder of the valve core A is inserted into the front cylinder hole of the valve core B, the front damping cavity is a cavity that is connected to the valve core B and the valve core A in a unidirectionally closed cavity. Is formed. Since the front guide post of the valve core A and the inner hole of the stopper are engaged with each other and the engagement gap between the valve core A and the stopper is small, there is an intermediate damping cavity that is a cavity that is closed between the valve core A and the stopper. It is formed. When the valve core moves forward and the valve is turned off, it has an excellent buffering action, reducing the impact of the valve core and increasing the durability of the valve.

In the expansion valve, which is another means, the valve core B is provided with a through hole communicating with the outside of the valve body and the through groove. When the refrigerant is small, the valve core A and the valve core B stop operating, the refrigerant enters the through groove from the through hole, and then flows out after passing through the outlet of the valve body. Since the valve core A and the valve core B are not actuated by the small flow rate of refrigerant, the wear between the valve cores is reduced, and the durability of the spring unit is enhanced.

In the expansion valve, a capillary tube is embedded in the through hole. A predetermined pressure drop occurs in the refrigeration system, and the capillary generates a pressure drop along the longitudinal direction based on its flow blocking force, thereby controlling the flow rate of the refrigerant and reducing the differential pressure between the condenser and the evaporator. It is guaranteed that continuous refrigeration is maintained to minimize different refrigeration.

In the expansion valve, which is another means, a flow guide groove is provided on the valve core A to connect the through groove and the front cylindrical hole. When the flow rate is small, the refrigerant enters directly into the front cylindrical hole from the through groove, preventing mutual movement between the two valve cores and reducing wear caused by the movement of the valve core.

In the expansion valve, which is another means, the valve core B is provided with a through hole that communicates the through groove with the flow inlet. When the flow rate is small, the refrigerant enters the flow inlet directly from the through groove.

In the expansion valve, which is another means, a through-hole penetrating the rear throttle conical hole and the front cylindrical hole is provided on the valve core A. When the flow rate is small, the refrigerant enters the front cylindrical hole directly from the rear conical hole.

Another means is that in the expansion valve, a through-hole that penetrates the valve core A in the axial direction is provided on the valve core A. The small flow rate refrigerant enters the valve body cavity directly from the passage of the valve core, and then is discharged from the orifice of the spring base to the valve body.

In the expansion valve, the spring unit includes a spring base and a spring, and one end of the spring contacts the valve core A or the valve core B, and the other end contacts the spring base. The spring base is fixed to both ends of the valve body, and at the end of the spring base, an orifice communicating with the casing is provided, and the ends of the valve core A and the valve core B are engaged with the valve body. A cylindrical body for reducing the gap and an attenuation ring groove are provided, and an opening attenuation ring is provided on the attenuation ring groove. A post-attenuation cavity is formed between the spring base, the valve body, the valve core A or the valve core B and the damping ring, and serves as a direction control cavity for the expansion valve.
In the expansion valve, the spring base has a position limiting rod for limiting the swing of the spring. By adding a position limiting rod, the swinging width in the axial direction of the spring is limited, so that the spring does not operate exceeding the load, and the durability of the spring is increased.

In the expansion valve, filter net modules are provided at an inlet end and an outlet end of the casing, and the filter net module includes a filter net stand and a filter net fixed to the casing. The filter network module filters foreign matter mixed in the refrigerant to prevent the expansion valve module from being blocked.

Compared to the prior art, the expansion valve has the following characteristics.
1. The structure is simple and the direction of the expansion valve can be controlled by controlling the pressure change of the refrigeration pipe through the direction change valve.
2. The damping structure maintains the pressure difference between the cavity, the outlet and the inlet in equilibrium, and guarantees the pressure required to compress the refrigerant into a liquid state. Furthermore, when the flow rate of the refrigerant is small, the valve core does not operate and the frequent operation of the spring can be reduced, so that the service life of the expansion valve module can be increased.
3. A pre-damping cavity is formed between the valve core A and valve core B, so that when the valve core A and valve core B are in contact, they have excellent buffering action and reduce their impact In addition, the durability of the expansion valve can be increased.
4. A middle damping cavity is formed between the stop and the valve core A, and a rear damping cavity is formed between the valve core A or the valve core B and the valve body. When B moves away from the valve seat, it has an excellent buffering effect, prevents the occurrence of vibration due to the momentary operation of the spring, reduces the noise of the spring, and increases the durability of the expansion valve.
5. The head of the valve core A and the valve core B are appropriately engaged, and the slit size in the throttle changes according to the change in the refrigerant flow rate. Therefore, the resistance due to the flow of the refrigerant can be reduced, and the energy effect ratio of the entire air conditioning can be greatly improved.

FIG. 1 is a diagram illustrating a structure of an expansion valve in the first embodiment. FIG. 2 is a view showing the structure of the valve core B in the first embodiment. FIG. 3 is a view showing the structure of the valve core A in the first embodiment. FIG. 4 is a view showing the structure of the retaining in Example 1. FIG. 5 is a diagram illustrating the structure of the spring base in the first embodiment. FIG. 6 is a diagram illustrating a flow guiding structure with a small flow rate in the second embodiment. FIG. 7 is a diagram showing a flow guiding structure with a small flow rate in the third embodiment. FIG. 8 is a diagram showing a flow guiding structure with a small flow rate in the fourth embodiment. FIG. 9 is a diagram illustrating a structure for introducing a small flow rate in the fifth embodiment. FIG. 10 is a diagram illustrating a flow guiding structure with a small flow rate in the sixth embodiment.

Hereinafter, the technical means of the present invention will be described in detail with reference to specific embodiments and drawings of the present invention, but the present invention is not limited to these embodiments.

<Example 1>
As shown in FIG. 1, the expansion valve includes a casing 10 having an inlet end 101 and an outlet end 102, and a straight cylindrical valve body 1 having a cavity is fixed in the casing 10, On the side wall, an inlet 11 and an outlet 12 for communicating the cavity and the casing 10 are provided. A spacer 8 for separating the inlet 11 and the outlet 12 is provided between the casing 10 and the valve body 1, and a valve core A2 and a valve core B3 that slide along the cavity are provided in the cavity, and the valve core A2 A stopper 7 is fixed at the center of the cavity between the valve core B3 and the valve core B3. At each end of the cavity, a spring unit is provided to urge the valve core A2 and the valve core B3 to move toward the stopper 7 and between the valve core A2 and the valve core B3, A damping structure capable of buffering the core A2 and the valve core B3 is provided.

Specifically, as shown in FIGS. 1, 2, 3, 4, and 5, the stopper 7 has a guiding hole 73, an annular recess 74, a guide that communicates the annular recess 74 with the inlet 11. It includes a flow stop 71 and a positioning groove 72 that fits with the valve body 1. The damping structure includes a valve core A2 and a valve core B3, and the head portion of the valve core A2 includes a front cylinder 21, a front throttle cone 22, a rear cylinder 23, a rear throttle cone 24, and a front guiding column 25. The valve core B3 includes a rear throttle conical hole 31, a rear cylindrical hole 32, a through groove 33, a front throttle conical hole 35, and a front cylindrical hole 36 that engage with the head portion of the valve core A2. On the valve core B3, a flow introduction port 37 that communicates the front cylindrical hole 36 and the outlet 12 with each other is provided.

The spring unit includes a spring base 5 and a spring 4. One end of the spring 4 abuts on the valve core A2 or the valve core B3, and the other end abuts on the spring base 5. The spring base 5 is fixed to both ends of the valve body 1 and is provided with an orifice 52 so as to communicate with one end of the casing 10. The spring base 5 has a position limiting rod 51 for limiting the swing of the spring 4. The ends of the valve core A2 and the valve core B3 have a cylindrical body that engages with the valve body 1 to reduce the gap and an attenuation ring groove 26. The attenuation ring groove 26 is provided with an opened attenuation ring 6. Yes. A filter net module 9 is provided at the inlet end 101 and the outlet end 102 of the casing 10, and the filter net module 9 includes a filter net stand and a filter net fixed to the casing 10.

The refrigerant enters from the casing 10, passes through the filter network module 9, and then enters the valve after being separated into two passages, a control passage and a guide passage.
If the refrigerant enters from the outlet end 102 on one side of the valve core B3,
In the control passage, the refrigerant enters from the outlet end 102 of the casing 10, and after passing through the filter network module 9 at the outlet end 102, further passes through the orifice 52 of the spring base 5 and acts on the valve core B3, thereby causing the valve outlet 12 to pass. Is greater than the pressure at the inlet 11, so the valve core B3 is propelled. At this time, the refrigerant in the cavity surrounded by the valve core A2, the valve body 1 and the spring base 5 is discharged from the valve body 1 through the orifice 52 of the spring base 5, and joins the flow path. When the valve core B3 comes into close contact with the stopper 7, the valve core B3 stops operating and is discharged.

In the guide passage, the inlet 11 and the outlet 12 of the valve body 1 are partitioned by the spacer 8, so that the refrigerant enters only the outlet 12 of the valve body 1 and enters the inlet 37 of the valve core B3, and further the valve core A2 Between the valve core B3 and the annular recess 74 of the stopper 7 and is discharged to the valve body 1 by the introduction hole 71 of the stopper 7 and the inlet 11 of the valve body 1, and further, After joining the control passage at this space between the casings 10, after passing through the filtration network module 9 consisting of a filtration network stand and a filtration network at the inlet end 101, it is discharged to the valve by the inlet end 101 of the casing 10. The

If refrigerant enters from the inlet end 101 on one side of the valve core A2,
In the control passage, the refrigerant enters the orifice 52 of the spring base 5 and acts on the valve core A2, and since the pressure at the inlet 11 of the valve is larger than the pressure at the outlet 12, the valve core A2 is pressed to approach the stopper 7 . At this time, the refrigerant in the cavity surrounded by the valve core B3, the valve body 1 and the spring base 5 is discharged from the valve body 1 by the orifice 52 of the spring base 5, and then merges with the flow passage. When the valve core A2 comes into close contact with the stopper 7, the valve core A2 stops operating and unloads.

In the guide passage, the inlet 11 and the outlet 12 of the valve body 1 are partitioned by the spacer 8, so that the refrigerant enters only the inlet 11 of the valve body 1 and passes through the flow guide hole 71 of the stopper 7 and then stops. After entering the annular recess 74 of the transfer 7 and further passing through the gap between the valve core A2 and the valve core B3, it is discharged to the valve body 1 from the inlet 37 of the valve core B3 and the outlet 12 of the valve body 1. In addition, after joining the control passage at this space between the valve body 1 and the casing 10, after passing through the filter network module 9 comprising the filter network stand and the filter network at the outlet end 102, the casing 10 The outlet end 102 is discharged into the valve.

The movement path of the valve core is provided with a cavity that is positioned between the valve core A2 and the valve core B3 and is closed between each other, and a cavity that is positioned between the stopper 7 and the valve core A2 and is closed between each other. Furthermore, since there is a cavity which is located between the valve body 1, the spring base 5 and the valve core A2 or the valve core B3 and is closed to each other, when the valve core A2 or the valve core B3 moves, a plurality of Attenuation can be generated. Due to the presence of multiple damping, when the valve core A2 or the valve core B3 moves, the impact of the two valve cores is reduced through a stable buffering process, and the conical head of the valve core and the valve core B3 The wear of the expansion valve can be reduced, and the service life of the expansion valve can be increased.

<Example 2>
The structure and principle of the second embodiment are substantially similar to those of the first embodiment, and as shown in FIG. 6, the small-flow-flow guide locus structure is added to the first embodiment. In the flow path structure with a small flow rate, a through hole 34 communicating with the outside of the valve element 1 and the through groove 33 is provided on the valve core B3, and a capillary tube is embedded in the through hole 34. By adding a capillary tube, the flow rate of the through hole 34 can be changed.

<Example 3>
The structure and principle of the third embodiment are almost similar to those of the second embodiment, and as shown in FIG. 7, the distinction from the second embodiment is a small flow rate guide structure. In the flow path structure with a small flow rate, a flow guide groove 27 that communicates the through groove 33 and the front cylindrical hole 36 is provided on the valve core A2.

<Example 4>
The structure and principle of the fourth embodiment are substantially similar to those of the second embodiment, and as shown in FIG. 8, the distinction from the second embodiment is a small flow rate guiding locus structure. In the flow guiding structure with a small flow rate, a through hole 34 is provided on the valve core B3 to communicate the through groove 33 and the flow inlet 37.

<Example 5>
The structure and principle of the fifth embodiment are substantially similar to those of the second embodiment, and as shown in FIG. 9, the distinction from the second embodiment is a small-flow-introduction trajectory structure. In the flow path structure with a small flow rate, a through hole 34 penetrating the rear conical conical hole 31 and the front cylindrical hole 36 is provided on the valve core A2.

<Example 6>
The structure and principle of the sixth embodiment are almost similar to those of the second embodiment, and as shown in FIG. 10, the distinction from the second embodiment is a small flow guide structure. In the flow guiding structure with a small flow rate, a through hole 34 is provided on the valve core A2 so as to penetrate the valve core A2 in the axial direction. The refrigerant having a small flow rate is not discharged to the valve body 1 by the outlet 12 of the valve body 1 but is directly discharged to the valve body 1 by the orifice 52 of the spring base 5.

The specific embodiments of the present invention are described by way of example with respect to the spirit of the present invention. Those skilled in the art will understand that various modifications or supplements or similar means to the specific embodiments of the invention may be substituted, but do not depart from the spirit of the invention or exceed the scope of the claims. Should do.

1 Disc
11 Entrance
12 Exit
2 Valve core A
21 Front cylinder
22 Front conical section
23 Rear cylinder
24 Rear diaphragm cone
25 Front guiding pillar
26 Damping ring groove
27 Conveying groove
3 Valve core B
31 Rear conical hole
32 Rear cylindrical hole
33 Through groove
34 Through hole
35 Front conical hole
36 Front cylindrical hole
37
4 Spring
5 Spring stand
51 Position limit bar
52 Orifice
6 Damping ring
7 Transfer
71
72 Position stop groove
73 Guiding hole
74 Annular recess
8 Spacer
9 Filter module
10 Casing
101 Entrance end
102 Exit end

Claims (10)

In the expansion valve,
Including a casing (10) having an inlet end (101) and an outlet end (102);
A straight cylindrical valve body (1) having a cavity is fixed in the casing (10), and an inlet (11) for communicating the cavity and the casing (10) on the side wall of the valve body (1). And an exit (12)
Between the casing (10) and the valve body (1), a spacer (8) for partitioning the inlet (11) and the outlet (12) is provided,
A valve core A (2) and a valve core B (3) that slide along the cavity and face each other are provided in the cavity,
A stopper (7) is provided at the center of the cavity between the valve core A (2) and the valve core B (3), and the valve core A (2) and the valve core are respectively provided at both ends of the cavity. There is a spring unit that stops B (3) and moves it toward (7)
Between the valve core A (2) and the valve core B (3) is provided a damping structure capable of buffering the valve core A (2) and the valve core B (3), An expansion valve characterized by that. The stop (7) includes a guiding hole (73), an annular recess (74), a flow guide hole (71) communicating with the annular recess (74) and the inlet (11), and a valve body (1). The expansion valve according to claim 1, further comprising a positioning groove (72) to be fitted. The damping structure includes a valve core A (2) and a valve core B (3),
The head portion of the valve core A (2) has a front cylinder (21), a front throttle cone (22), a rear cylinder (23), a rear throttle cone (24), and a front guiding column (25). ,
The valve core B (3) includes a rear throttle conical hole (31), a rear cylindrical hole (32), a through groove (33), and a front throttle conical hole (35) that match the head portion of the valve core A (2). And a front cylindrical hole (36),
The expansion valve according to claim 2, wherein the valve core B (3) is provided with a flow introduction port (37) that allows the front cylindrical hole (36) and the outlet (12) to communicate with each other. . The expansion valve according to claim 3, wherein the valve core B (3) is provided with a through hole (34) communicating with the outside of the valve body (1) and the through groove (33). . The expansion valve according to claim 3, wherein the valve core A (2) is provided with a flow guide groove (27) communicating the through groove (33) and the front cylindrical hole (36). The expansion valve according to claim 3, wherein the valve core B (3) is provided with a through hole (34) communicating with the through groove (33) and the flow guide port (37). The expansion valve according to claim 3, wherein the valve core A (2) is provided with a through hole (34) communicating with the rear throttle conical hole (31) and the front cylindrical hole (36). The expansion valve according to claim 3, wherein a through hole (34) penetrating the valve core A (2) in the axial direction is provided on the valve core A (2). The spring unit includes a spring base (5) and a spring (4),
One end of the spring (4) is in contact with the valve core A (2) or the valve core B (3), and the other end is in contact with the spring base (5),
The spring base (5) is fixed to both ends of the valve body (1), and the end of the spring base (5) is provided with an orifice (52) communicating with the casing (10),
The ends of the valve core A (2) and the valve core B (3) have a cylindrical body having a gap engaging with the valve body (1) and an attenuation ring groove (26), and the attenuation ring groove (26 9) An expansion valve according to any one of claims 1 to 8, characterized in that an open damping ring (6) is provided. The inlet end (101) and outlet end (102) of the casing (10) are provided with a filter net module (9), and the filter net module (9) is a filter net stand fixed to the casing (10). The expansion valve according to claim 9, further comprising: a filter net.